author | Florian Westphal <fw@strlen.de> |
Thu, 09 Apr 2009 12:07:21 +0200 | |
changeset 2 | d1f6d8b6f81c |
parent 0 | aa628870c1d3 |
permissions | -rw-r--r-- |
0
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Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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/* |
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Port of Linux 2.6.28 for use with network simulation cradle.
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* Copyright (C) 2005 David Brownell |
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Port of Linux 2.6.28 for use with network simulation cradle.
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* |
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Port of Linux 2.6.28 for use with network simulation cradle.
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* This program is free software; you can redistribute it and/or modify |
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Port of Linux 2.6.28 for use with network simulation cradle.
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* it under the terms of the GNU General Public License as published by |
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Port of Linux 2.6.28 for use with network simulation cradle.
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* the Free Software Foundation; either version 2 of the License, or |
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Port of Linux 2.6.28 for use with network simulation cradle.
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* (at your option) any later version. |
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Port of Linux 2.6.28 for use with network simulation cradle.
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* |
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* This program is distributed in the hope that it will be useful, |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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* GNU General Public License for more details. |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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* |
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* You should have received a copy of the GNU General Public License |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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*/ |
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Port of Linux 2.6.28 for use with network simulation cradle.
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|
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#ifndef __LINUX_SPI_H |
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#define __LINUX_SPI_H |
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#include <linux/device.h> |
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||
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/* |
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* INTERFACES between SPI master-side drivers and SPI infrastructure. |
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* (There's no SPI slave support for Linux yet...) |
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*/ |
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extern struct bus_type spi_bus_type; |
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|
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/** |
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* struct spi_device - Master side proxy for an SPI slave device |
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* @dev: Driver model representation of the device. |
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* @master: SPI controller used with the device. |
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* @max_speed_hz: Maximum clock rate to be used with this chip |
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* (on this board); may be changed by the device's driver. |
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* The spi_transfer.speed_hz can override this for each transfer. |
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* @chip_select: Chipselect, distinguishing chips handled by @master. |
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* @mode: The spi mode defines how data is clocked out and in. |
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* This may be changed by the device's driver. |
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* The "active low" default for chipselect mode can be overridden |
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* (by specifying SPI_CS_HIGH) as can the "MSB first" default for |
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* each word in a transfer (by specifying SPI_LSB_FIRST). |
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* @bits_per_word: Data transfers involve one or more words; word sizes |
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* like eight or 12 bits are common. In-memory wordsizes are |
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* powers of two bytes (e.g. 20 bit samples use 32 bits). |
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* This may be changed by the device's driver, or left at the |
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* default (0) indicating protocol words are eight bit bytes. |
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* The spi_transfer.bits_per_word can override this for each transfer. |
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* @irq: Negative, or the number passed to request_irq() to receive |
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* interrupts from this device. |
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* @controller_state: Controller's runtime state |
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* @controller_data: Board-specific definitions for controller, such as |
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* FIFO initialization parameters; from board_info.controller_data |
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* @modalias: Name of the driver to use with this device, or an alias |
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* for that name. This appears in the sysfs "modalias" attribute |
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* for driver coldplugging, and in uevents used for hotplugging |
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* |
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* A @spi_device is used to interchange data between an SPI slave |
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* (usually a discrete chip) and CPU memory. |
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* |
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* In @dev, the platform_data is used to hold information about this |
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* device that's meaningful to the device's protocol driver, but not |
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* to its controller. One example might be an identifier for a chip |
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* variant with slightly different functionality; another might be |
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* information about how this particular board wires the chip's pins. |
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*/ |
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struct spi_device { |
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struct device dev; |
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struct spi_master *master; |
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u32 max_speed_hz; |
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u8 chip_select; |
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u8 mode; |
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#define SPI_CPHA 0x01 /* clock phase */ |
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#define SPI_CPOL 0x02 /* clock polarity */ |
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#define SPI_MODE_0 (0|0) /* (original MicroWire) */ |
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#define SPI_MODE_1 (0|SPI_CPHA) |
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#define SPI_MODE_2 (SPI_CPOL|0) |
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#define SPI_MODE_3 (SPI_CPOL|SPI_CPHA) |
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#define SPI_CS_HIGH 0x04 /* chipselect active high? */ |
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#define SPI_LSB_FIRST 0x08 /* per-word bits-on-wire */ |
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#define SPI_3WIRE 0x10 /* SI/SO signals shared */ |
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#define SPI_LOOP 0x20 /* loopback mode */ |
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u8 bits_per_word; |
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int irq; |
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void *controller_state; |
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void *controller_data; |
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char modalias[32]; |
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|
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/* |
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* likely need more hooks for more protocol options affecting how |
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* the controller talks to each chip, like: |
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* - memory packing (12 bit samples into low bits, others zeroed) |
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* - priority |
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* - drop chipselect after each word |
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* - chipselect delays |
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* - ... |
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*/ |
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}; |
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static inline struct spi_device *to_spi_device(struct device *dev) |
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{ |
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return dev ? container_of(dev, struct spi_device, dev) : NULL; |
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} |
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|
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/* most drivers won't need to care about device refcounting */ |
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static inline struct spi_device *spi_dev_get(struct spi_device *spi) |
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{ |
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return (spi && get_device(&spi->dev)) ? spi : NULL; |
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} |
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static inline void spi_dev_put(struct spi_device *spi) |
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{ |
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if (spi) |
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put_device(&spi->dev); |
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} |
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|
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/* ctldata is for the bus_master driver's runtime state */ |
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static inline void *spi_get_ctldata(struct spi_device *spi) |
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{ |
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return spi->controller_state; |
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} |
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|
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static inline void spi_set_ctldata(struct spi_device *spi, void *state) |
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{ |
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spi->controller_state = state; |
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} |
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|
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/* device driver data */ |
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|
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static inline void spi_set_drvdata(struct spi_device *spi, void *data) |
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{ |
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dev_set_drvdata(&spi->dev, data); |
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} |
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|
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static inline void *spi_get_drvdata(struct spi_device *spi) |
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{ |
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return dev_get_drvdata(&spi->dev); |
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} |
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|
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struct spi_message; |
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|
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|
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|
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/** |
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* struct spi_driver - Host side "protocol" driver |
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* @probe: Binds this driver to the spi device. Drivers can verify |
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* that the device is actually present, and may need to configure |
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* characteristics (such as bits_per_word) which weren't needed for |
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* the initial configuration done during system setup. |
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* @remove: Unbinds this driver from the spi device |
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* @shutdown: Standard shutdown callback used during system state |
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* transitions such as powerdown/halt and kexec |
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* @suspend: Standard suspend callback used during system state transitions |
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* @resume: Standard resume callback used during system state transitions |
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* @driver: SPI device drivers should initialize the name and owner |
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* field of this structure. |
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* |
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* This represents the kind of device driver that uses SPI messages to |
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* interact with the hardware at the other end of a SPI link. It's called |
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* a "protocol" driver because it works through messages rather than talking |
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* directly to SPI hardware (which is what the underlying SPI controller |
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* driver does to pass those messages). These protocols are defined in the |
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* specification for the device(s) supported by the driver. |
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* |
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* As a rule, those device protocols represent the lowest level interface |
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* supported by a driver, and it will support upper level interfaces too. |
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* Examples of such upper levels include frameworks like MTD, networking, |
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* MMC, RTC, filesystem character device nodes, and hardware monitoring. |
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*/ |
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struct spi_driver { |
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int (*probe)(struct spi_device *spi); |
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int (*remove)(struct spi_device *spi); |
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void (*shutdown)(struct spi_device *spi); |
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int (*suspend)(struct spi_device *spi, pm_message_t mesg); |
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int (*resume)(struct spi_device *spi); |
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struct device_driver driver; |
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177 |
}; |
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178 |
|
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static inline struct spi_driver *to_spi_driver(struct device_driver *drv) |
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{ |
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return drv ? container_of(drv, struct spi_driver, driver) : NULL; |
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182 |
} |
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183 |
|
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extern int spi_register_driver(struct spi_driver *sdrv); |
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185 |
|
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186 |
/** |
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* spi_unregister_driver - reverse effect of spi_register_driver |
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* @sdrv: the driver to unregister |
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* Context: can sleep |
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190 |
*/ |
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static inline void spi_unregister_driver(struct spi_driver *sdrv) |
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192 |
{ |
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193 |
if (sdrv) |
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194 |
driver_unregister(&sdrv->driver); |
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195 |
} |
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196 |
|
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197 |
|
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198 |
/** |
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* struct spi_master - interface to SPI master controller |
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* @dev: device interface to this driver |
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* @bus_num: board-specific (and often SOC-specific) identifier for a |
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* given SPI controller. |
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* @num_chipselect: chipselects are used to distinguish individual |
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* SPI slaves, and are numbered from zero to num_chipselects. |
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* each slave has a chipselect signal, but it's common that not |
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* every chipselect is connected to a slave. |
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* @setup: updates the device mode and clocking records used by a |
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* device's SPI controller; protocol code may call this. This |
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* must fail if an unrecognized or unsupported mode is requested. |
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* It's always safe to call this unless transfers are pending on |
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* the device whose settings are being modified. |
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* @transfer: adds a message to the controller's transfer queue. |
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* @cleanup: frees controller-specific state |
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* |
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* Each SPI master controller can communicate with one or more @spi_device |
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* children. These make a small bus, sharing MOSI, MISO and SCK signals |
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* but not chip select signals. Each device may be configured to use a |
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* different clock rate, since those shared signals are ignored unless |
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* the chip is selected. |
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220 |
* |
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221 |
* The driver for an SPI controller manages access to those devices through |
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222 |
* a queue of spi_message transactions, copying data between CPU memory and |
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223 |
* an SPI slave device. For each such message it queues, it calls the |
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* message's completion function when the transaction completes. |
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225 |
*/ |
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226 |
struct spi_master { |
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struct device dev; |
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|
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/* other than negative (== assign one dynamically), bus_num is fully |
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* board-specific. usually that simplifies to being SOC-specific. |
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* example: one SOC has three SPI controllers, numbered 0..2, |
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* and one board's schematics might show it using SPI-2. software |
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* would normally use bus_num=2 for that controller. |
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*/ |
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s16 bus_num; |
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|
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/* chipselects will be integral to many controllers; some others |
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* might use board-specific GPIOs. |
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*/ |
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u16 num_chipselect; |
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|
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/* setup mode and clock, etc (spi driver may call many times) */ |
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int (*setup)(struct spi_device *spi); |
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244 |
|
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/* bidirectional bulk transfers |
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* |
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* + The transfer() method may not sleep; its main role is |
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* just to add the message to the queue. |
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* + For now there's no remove-from-queue operation, or |
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* any other request management |
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* + To a given spi_device, message queueing is pure fifo |
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* |
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* + The master's main job is to process its message queue, |
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* selecting a chip then transferring data |
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* + If there are multiple spi_device children, the i/o queue |
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* arbitration algorithm is unspecified (round robin, fifo, |
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* priority, reservations, preemption, etc) |
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* |
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* + Chipselect stays active during the entire message |
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* (unless modified by spi_transfer.cs_change != 0). |
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* + The message transfers use clock and SPI mode parameters |
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* previously established by setup() for this device |
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*/ |
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int (*transfer)(struct spi_device *spi, |
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struct spi_message *mesg); |
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|
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/* called on release() to free memory provided by spi_master */ |
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void (*cleanup)(struct spi_device *spi); |
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}; |
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|
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static inline void *spi_master_get_devdata(struct spi_master *master) |
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{ |
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return dev_get_drvdata(&master->dev); |
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} |
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|
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static inline void spi_master_set_devdata(struct spi_master *master, void *data) |
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{ |
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dev_set_drvdata(&master->dev, data); |
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} |
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|
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static inline struct spi_master *spi_master_get(struct spi_master *master) |
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{ |
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if (!master || !get_device(&master->dev)) |
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return NULL; |
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return master; |
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} |
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|
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static inline void spi_master_put(struct spi_master *master) |
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{ |
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if (master) |
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put_device(&master->dev); |
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} |
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|
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|
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/* the spi driver core manages memory for the spi_master classdev */ |
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extern struct spi_master * |
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spi_alloc_master(struct device *host, unsigned size); |
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|
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extern int spi_register_master(struct spi_master *master); |
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extern void spi_unregister_master(struct spi_master *master); |
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|
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extern struct spi_master *spi_busnum_to_master(u16 busnum); |
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|
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/*---------------------------------------------------------------------------*/ |
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305 |
|
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/* |
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* I/O INTERFACE between SPI controller and protocol drivers |
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* |
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309 |
* Protocol drivers use a queue of spi_messages, each transferring data |
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* between the controller and memory buffers. |
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311 |
* |
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312 |
* The spi_messages themselves consist of a series of read+write transfer |
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313 |
* segments. Those segments always read the same number of bits as they |
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* write; but one or the other is easily ignored by passing a null buffer |
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* pointer. (This is unlike most types of I/O API, because SPI hardware |
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316 |
* is full duplex.) |
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317 |
* |
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318 |
* NOTE: Allocation of spi_transfer and spi_message memory is entirely |
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319 |
* up to the protocol driver, which guarantees the integrity of both (as |
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320 |
* well as the data buffers) for as long as the message is queued. |
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321 |
*/ |
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|
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323 |
/** |
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324 |
* struct spi_transfer - a read/write buffer pair |
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325 |
* @tx_buf: data to be written (dma-safe memory), or NULL |
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326 |
* @rx_buf: data to be read (dma-safe memory), or NULL |
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327 |
* @tx_dma: DMA address of tx_buf, if @spi_message.is_dma_mapped |
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328 |
* @rx_dma: DMA address of rx_buf, if @spi_message.is_dma_mapped |
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329 |
* @len: size of rx and tx buffers (in bytes) |
2 | 330 |
* @speed_hz: Select a speed other than the device default for this |
0
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331 |
* transfer. If 0 the default (from @spi_device) is used. |
2 | 332 |
* @bits_per_word: select a bits_per_word other than the device default |
0
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333 |
* for this transfer. If 0 the default (from @spi_device) is used. |
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334 |
* @cs_change: affects chipselect after this transfer completes |
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335 |
* @delay_usecs: microseconds to delay after this transfer before |
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336 |
* (optionally) changing the chipselect status, then starting |
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337 |
* the next transfer or completing this @spi_message. |
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|
338 |
* @transfer_list: transfers are sequenced through @spi_message.transfers |
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|
339 |
* |
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|
340 |
* SPI transfers always write the same number of bytes as they read. |
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Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
341 |
* Protocol drivers should always provide @rx_buf and/or @tx_buf. |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
diff
changeset
|
342 |
* In some cases, they may also want to provide DMA addresses for |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
diff
changeset
|
343 |
* the data being transferred; that may reduce overhead, when the |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
diff
changeset
|
344 |
* underlying driver uses dma. |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
diff
changeset
|
345 |
* |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
346 |
* If the transmit buffer is null, zeroes will be shifted out |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
347 |
* while filling @rx_buf. If the receive buffer is null, the data |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
348 |
* shifted in will be discarded. Only "len" bytes shift out (or in). |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
diff
changeset
|
349 |
* It's an error to try to shift out a partial word. (For example, by |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
350 |
* shifting out three bytes with word size of sixteen or twenty bits; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
351 |
* the former uses two bytes per word, the latter uses four bytes.) |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
352 |
* |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
353 |
* In-memory data values are always in native CPU byte order, translated |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
354 |
* from the wire byte order (big-endian except with SPI_LSB_FIRST). So |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
355 |
* for example when bits_per_word is sixteen, buffers are 2N bytes long |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
356 |
* (@len = 2N) and hold N sixteen bit words in CPU byte order. |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
357 |
* |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
358 |
* When the word size of the SPI transfer is not a power-of-two multiple |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
359 |
* of eight bits, those in-memory words include extra bits. In-memory |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
360 |
* words are always seen by protocol drivers as right-justified, so the |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
361 |
* undefined (rx) or unused (tx) bits are always the most significant bits. |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
362 |
* |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
363 |
* All SPI transfers start with the relevant chipselect active. Normally |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
364 |
* it stays selected until after the last transfer in a message. Drivers |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
365 |
* can affect the chipselect signal using cs_change. |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
366 |
* |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
367 |
* (i) If the transfer isn't the last one in the message, this flag is |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
368 |
* used to make the chipselect briefly go inactive in the middle of the |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
369 |
* message. Toggling chipselect in this way may be needed to terminate |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
370 |
* a chip command, letting a single spi_message perform all of group of |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
371 |
* chip transactions together. |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
372 |
* |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
373 |
* (ii) When the transfer is the last one in the message, the chip may |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
374 |
* stay selected until the next transfer. On multi-device SPI busses |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
375 |
* with nothing blocking messages going to other devices, this is just |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
376 |
* a performance hint; starting a message to another device deselects |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
377 |
* this one. But in other cases, this can be used to ensure correctness. |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
378 |
* Some devices need protocol transactions to be built from a series of |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
379 |
* spi_message submissions, where the content of one message is determined |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
380 |
* by the results of previous messages and where the whole transaction |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
381 |
* ends when the chipselect goes intactive. |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
382 |
* |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
383 |
* The code that submits an spi_message (and its spi_transfers) |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
384 |
* to the lower layers is responsible for managing its memory. |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
385 |
* Zero-initialize every field you don't set up explicitly, to |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
386 |
* insulate against future API updates. After you submit a message |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
387 |
* and its transfers, ignore them until its completion callback. |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
388 |
*/ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
389 |
struct spi_transfer { |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
390 |
/* it's ok if tx_buf == rx_buf (right?) |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
391 |
* for MicroWire, one buffer must be null |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
392 |
* buffers must work with dma_*map_single() calls, unless |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
393 |
* spi_message.is_dma_mapped reports a pre-existing mapping |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
394 |
*/ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
395 |
const void *tx_buf; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
396 |
void *rx_buf; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
397 |
unsigned len; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
398 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
399 |
dma_addr_t tx_dma; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
400 |
dma_addr_t rx_dma; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
401 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
402 |
unsigned cs_change:1; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
403 |
u8 bits_per_word; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
404 |
u16 delay_usecs; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
405 |
u32 speed_hz; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
406 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
407 |
struct list_head transfer_list; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
408 |
}; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
409 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
410 |
/** |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
411 |
* struct spi_message - one multi-segment SPI transaction |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
412 |
* @transfers: list of transfer segments in this transaction |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
413 |
* @spi: SPI device to which the transaction is queued |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
414 |
* @is_dma_mapped: if true, the caller provided both dma and cpu virtual |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
415 |
* addresses for each transfer buffer |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
416 |
* @complete: called to report transaction completions |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
417 |
* @context: the argument to complete() when it's called |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
418 |
* @actual_length: the total number of bytes that were transferred in all |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
419 |
* successful segments |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
420 |
* @status: zero for success, else negative errno |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
421 |
* @queue: for use by whichever driver currently owns the message |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
422 |
* @state: for use by whichever driver currently owns the message |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
423 |
* |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
424 |
* A @spi_message is used to execute an atomic sequence of data transfers, |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
425 |
* each represented by a struct spi_transfer. The sequence is "atomic" |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
426 |
* in the sense that no other spi_message may use that SPI bus until that |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
427 |
* sequence completes. On some systems, many such sequences can execute as |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
428 |
* as single programmed DMA transfer. On all systems, these messages are |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
429 |
* queued, and might complete after transactions to other devices. Messages |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
430 |
* sent to a given spi_device are alway executed in FIFO order. |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
431 |
* |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
432 |
* The code that submits an spi_message (and its spi_transfers) |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
433 |
* to the lower layers is responsible for managing its memory. |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
434 |
* Zero-initialize every field you don't set up explicitly, to |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
435 |
* insulate against future API updates. After you submit a message |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
436 |
* and its transfers, ignore them until its completion callback. |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
437 |
*/ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
438 |
struct spi_message { |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
439 |
struct list_head transfers; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
440 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
441 |
struct spi_device *spi; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
442 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
443 |
unsigned is_dma_mapped:1; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
444 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
445 |
/* REVISIT: we might want a flag affecting the behavior of the |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
446 |
* last transfer ... allowing things like "read 16 bit length L" |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
447 |
* immediately followed by "read L bytes". Basically imposing |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
448 |
* a specific message scheduling algorithm. |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
449 |
* |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
450 |
* Some controller drivers (message-at-a-time queue processing) |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
451 |
* could provide that as their default scheduling algorithm. But |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
452 |
* others (with multi-message pipelines) could need a flag to |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
453 |
* tell them about such special cases. |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
454 |
*/ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
455 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
456 |
/* completion is reported through a callback */ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
457 |
void (*complete)(void *context); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
458 |
void *context; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
459 |
unsigned actual_length; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
460 |
int status; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
461 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
462 |
/* for optional use by whatever driver currently owns the |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
463 |
* spi_message ... between calls to spi_async and then later |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
464 |
* complete(), that's the spi_master controller driver. |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
465 |
*/ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
466 |
struct list_head queue; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
467 |
void *state; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
468 |
}; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
469 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
470 |
static inline void spi_message_init(struct spi_message *m) |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
471 |
{ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
472 |
memset(m, 0, sizeof *m); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
473 |
INIT_LIST_HEAD(&m->transfers); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
474 |
} |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
475 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
476 |
static inline void |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
477 |
spi_message_add_tail(struct spi_transfer *t, struct spi_message *m) |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
478 |
{ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
479 |
list_add_tail(&t->transfer_list, &m->transfers); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
480 |
} |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
481 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
482 |
static inline void |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
483 |
spi_transfer_del(struct spi_transfer *t) |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
484 |
{ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
485 |
list_del(&t->transfer_list); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
486 |
} |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
487 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
488 |
/* It's fine to embed message and transaction structures in other data |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
489 |
* structures so long as you don't free them while they're in use. |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
490 |
*/ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
491 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
492 |
static inline struct spi_message *spi_message_alloc(unsigned ntrans, gfp_t flags) |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
493 |
{ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
494 |
struct spi_message *m; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
495 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
496 |
m = kzalloc(sizeof(struct spi_message) |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
497 |
+ ntrans * sizeof(struct spi_transfer), |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
498 |
flags); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
499 |
if (m) { |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
500 |
int i; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
501 |
struct spi_transfer *t = (struct spi_transfer *)(m + 1); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
502 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
503 |
INIT_LIST_HEAD(&m->transfers); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
504 |
for (i = 0; i < ntrans; i++, t++) |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
505 |
spi_message_add_tail(t, m); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
506 |
} |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
507 |
return m; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
508 |
} |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
509 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
510 |
static inline void spi_message_free(struct spi_message *m) |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
511 |
{ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
512 |
kfree(m); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
513 |
} |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
514 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
515 |
/** |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
516 |
* spi_setup - setup SPI mode and clock rate |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
517 |
* @spi: the device whose settings are being modified |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
518 |
* Context: can sleep, and no requests are queued to the device |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
519 |
* |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
520 |
* SPI protocol drivers may need to update the transfer mode if the |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
521 |
* device doesn't work with its default. They may likewise need |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
522 |
* to update clock rates or word sizes from initial values. This function |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
523 |
* changes those settings, and must be called from a context that can sleep. |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
524 |
* Except for SPI_CS_HIGH, which takes effect immediately, the changes take |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
525 |
* effect the next time the device is selected and data is transferred to |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
526 |
* or from it. When this function returns, the spi device is deselected. |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
527 |
* |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
528 |
* Note that this call will fail if the protocol driver specifies an option |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
529 |
* that the underlying controller or its driver does not support. For |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
530 |
* example, not all hardware supports wire transfers using nine bit words, |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
531 |
* LSB-first wire encoding, or active-high chipselects. |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
532 |
*/ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
533 |
static inline int |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
534 |
spi_setup(struct spi_device *spi) |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
535 |
{ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
536 |
return spi->master->setup(spi); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
537 |
} |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
538 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
539 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
540 |
/** |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
541 |
* spi_async - asynchronous SPI transfer |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
542 |
* @spi: device with which data will be exchanged |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
543 |
* @message: describes the data transfers, including completion callback |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
544 |
* Context: any (irqs may be blocked, etc) |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
545 |
* |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
546 |
* This call may be used in_irq and other contexts which can't sleep, |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
547 |
* as well as from task contexts which can sleep. |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
548 |
* |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
549 |
* The completion callback is invoked in a context which can't sleep. |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
550 |
* Before that invocation, the value of message->status is undefined. |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
551 |
* When the callback is issued, message->status holds either zero (to |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
552 |
* indicate complete success) or a negative error code. After that |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
553 |
* callback returns, the driver which issued the transfer request may |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
554 |
* deallocate the associated memory; it's no longer in use by any SPI |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
555 |
* core or controller driver code. |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
556 |
* |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
557 |
* Note that although all messages to a spi_device are handled in |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
558 |
* FIFO order, messages may go to different devices in other orders. |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
559 |
* Some device might be higher priority, or have various "hard" access |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
560 |
* time requirements, for example. |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
561 |
* |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
562 |
* On detection of any fault during the transfer, processing of |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
563 |
* the entire message is aborted, and the device is deselected. |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
564 |
* Until returning from the associated message completion callback, |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
565 |
* no other spi_message queued to that device will be processed. |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
566 |
* (This rule applies equally to all the synchronous transfer calls, |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
567 |
* which are wrappers around this core asynchronous primitive.) |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
568 |
*/ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
569 |
static inline int |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
570 |
spi_async(struct spi_device *spi, struct spi_message *message) |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
571 |
{ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
572 |
message->spi = spi; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
573 |
return spi->master->transfer(spi, message); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
574 |
} |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
575 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
576 |
/*---------------------------------------------------------------------------*/ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
577 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
578 |
/* All these synchronous SPI transfer routines are utilities layered |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
579 |
* over the core async transfer primitive. Here, "synchronous" means |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
580 |
* they will sleep uninterruptibly until the async transfer completes. |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
581 |
*/ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
582 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
583 |
extern int spi_sync(struct spi_device *spi, struct spi_message *message); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
584 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
585 |
/** |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
586 |
* spi_write - SPI synchronous write |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
587 |
* @spi: device to which data will be written |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
588 |
* @buf: data buffer |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
589 |
* @len: data buffer size |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
590 |
* Context: can sleep |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
591 |
* |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
592 |
* This writes the buffer and returns zero or a negative error code. |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
593 |
* Callable only from contexts that can sleep. |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
594 |
*/ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
595 |
static inline int |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
596 |
spi_write(struct spi_device *spi, const u8 *buf, size_t len) |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
597 |
{ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
598 |
struct spi_transfer t = { |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
599 |
.tx_buf = buf, |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
600 |
.len = len, |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
601 |
}; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
602 |
struct spi_message m; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
603 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
604 |
spi_message_init(&m); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
605 |
spi_message_add_tail(&t, &m); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
606 |
return spi_sync(spi, &m); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
607 |
} |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
608 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
609 |
/** |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
610 |
* spi_read - SPI synchronous read |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
611 |
* @spi: device from which data will be read |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
612 |
* @buf: data buffer |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
613 |
* @len: data buffer size |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
614 |
* Context: can sleep |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
615 |
* |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
616 |
* This reads the buffer and returns zero or a negative error code. |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
617 |
* Callable only from contexts that can sleep. |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
618 |
*/ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
619 |
static inline int |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
620 |
spi_read(struct spi_device *spi, u8 *buf, size_t len) |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
621 |
{ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
622 |
struct spi_transfer t = { |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
623 |
.rx_buf = buf, |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
624 |
.len = len, |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
625 |
}; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
626 |
struct spi_message m; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
627 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
628 |
spi_message_init(&m); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
629 |
spi_message_add_tail(&t, &m); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
630 |
return spi_sync(spi, &m); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
631 |
} |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
632 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
633 |
/* this copies txbuf and rxbuf data; for small transfers only! */ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
634 |
extern int spi_write_then_read(struct spi_device *spi, |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
635 |
const u8 *txbuf, unsigned n_tx, |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
636 |
u8 *rxbuf, unsigned n_rx); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
637 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
638 |
/** |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
639 |
* spi_w8r8 - SPI synchronous 8 bit write followed by 8 bit read |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
640 |
* @spi: device with which data will be exchanged |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
641 |
* @cmd: command to be written before data is read back |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
642 |
* Context: can sleep |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
643 |
* |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
644 |
* This returns the (unsigned) eight bit number returned by the |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
645 |
* device, or else a negative error code. Callable only from |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
646 |
* contexts that can sleep. |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
647 |
*/ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
648 |
static inline ssize_t spi_w8r8(struct spi_device *spi, u8 cmd) |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
649 |
{ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
650 |
ssize_t status; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
651 |
u8 result; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
652 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
653 |
status = spi_write_then_read(spi, &cmd, 1, &result, 1); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
654 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
655 |
/* return negative errno or unsigned value */ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
656 |
return (status < 0) ? status : result; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
657 |
} |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
658 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
659 |
/** |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
660 |
* spi_w8r16 - SPI synchronous 8 bit write followed by 16 bit read |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
661 |
* @spi: device with which data will be exchanged |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
662 |
* @cmd: command to be written before data is read back |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
663 |
* Context: can sleep |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
664 |
* |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
665 |
* This returns the (unsigned) sixteen bit number returned by the |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
666 |
* device, or else a negative error code. Callable only from |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
667 |
* contexts that can sleep. |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
668 |
* |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
669 |
* The number is returned in wire-order, which is at least sometimes |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
670 |
* big-endian. |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
671 |
*/ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
672 |
static inline ssize_t spi_w8r16(struct spi_device *spi, u8 cmd) |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
673 |
{ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
674 |
ssize_t status; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
675 |
u16 result; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
676 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
677 |
status = spi_write_then_read(spi, &cmd, 1, (u8 *) &result, 2); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
678 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
679 |
/* return negative errno or unsigned value */ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
680 |
return (status < 0) ? status : result; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
681 |
} |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
682 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
683 |
/*---------------------------------------------------------------------------*/ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
684 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
685 |
/* |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
686 |
* INTERFACE between board init code and SPI infrastructure. |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
687 |
* |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
688 |
* No SPI driver ever sees these SPI device table segments, but |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
689 |
* it's how the SPI core (or adapters that get hotplugged) grows |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
690 |
* the driver model tree. |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
691 |
* |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
692 |
* As a rule, SPI devices can't be probed. Instead, board init code |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
693 |
* provides a table listing the devices which are present, with enough |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
694 |
* information to bind and set up the device's driver. There's basic |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
695 |
* support for nonstatic configurations too; enough to handle adding |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
696 |
* parport adapters, or microcontrollers acting as USB-to-SPI bridges. |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
697 |
*/ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
698 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
699 |
/** |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
700 |
* struct spi_board_info - board-specific template for a SPI device |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
701 |
* @modalias: Initializes spi_device.modalias; identifies the driver. |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
702 |
* @platform_data: Initializes spi_device.platform_data; the particular |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
703 |
* data stored there is driver-specific. |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
704 |
* @controller_data: Initializes spi_device.controller_data; some |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
705 |
* controllers need hints about hardware setup, e.g. for DMA. |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
706 |
* @irq: Initializes spi_device.irq; depends on how the board is wired. |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
707 |
* @max_speed_hz: Initializes spi_device.max_speed_hz; based on limits |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
708 |
* from the chip datasheet and board-specific signal quality issues. |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
709 |
* @bus_num: Identifies which spi_master parents the spi_device; unused |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
710 |
* by spi_new_device(), and otherwise depends on board wiring. |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
711 |
* @chip_select: Initializes spi_device.chip_select; depends on how |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
712 |
* the board is wired. |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
713 |
* @mode: Initializes spi_device.mode; based on the chip datasheet, board |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
714 |
* wiring (some devices support both 3WIRE and standard modes), and |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
715 |
* possibly presence of an inverter in the chipselect path. |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
716 |
* |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
717 |
* When adding new SPI devices to the device tree, these structures serve |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
718 |
* as a partial device template. They hold information which can't always |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
719 |
* be determined by drivers. Information that probe() can establish (such |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
720 |
* as the default transfer wordsize) is not included here. |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
721 |
* |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
722 |
* These structures are used in two places. Their primary role is to |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
723 |
* be stored in tables of board-specific device descriptors, which are |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
724 |
* declared early in board initialization and then used (much later) to |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
725 |
* populate a controller's device tree after the that controller's driver |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
726 |
* initializes. A secondary (and atypical) role is as a parameter to |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
727 |
* spi_new_device() call, which happens after those controller drivers |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
728 |
* are active in some dynamic board configuration models. |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
729 |
*/ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
730 |
struct spi_board_info { |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
731 |
/* the device name and module name are coupled, like platform_bus; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
732 |
* "modalias" is normally the driver name. |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
733 |
* |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
734 |
* platform_data goes to spi_device.dev.platform_data, |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
735 |
* controller_data goes to spi_device.controller_data, |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
736 |
* irq is copied too |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
737 |
*/ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
738 |
char modalias[32]; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
739 |
const void *platform_data; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
740 |
void *controller_data; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
741 |
int irq; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
742 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
743 |
/* slower signaling on noisy or low voltage boards */ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
744 |
u32 max_speed_hz; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
745 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
746 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
747 |
/* bus_num is board specific and matches the bus_num of some |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
748 |
* spi_master that will probably be registered later. |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
749 |
* |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
750 |
* chip_select reflects how this chip is wired to that master; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
751 |
* it's less than num_chipselect. |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
752 |
*/ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
753 |
u16 bus_num; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
754 |
u16 chip_select; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
755 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
756 |
/* mode becomes spi_device.mode, and is essential for chips |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
757 |
* where the default of SPI_CS_HIGH = 0 is wrong. |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
758 |
*/ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
759 |
u8 mode; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
760 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
761 |
/* ... may need additional spi_device chip config data here. |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
762 |
* avoid stuff protocol drivers can set; but include stuff |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
763 |
* needed to behave without being bound to a driver: |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
764 |
* - quirks like clock rate mattering when not selected |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
765 |
*/ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
766 |
}; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
767 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
768 |
#ifdef CONFIG_SPI |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
769 |
extern int |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
770 |
spi_register_board_info(struct spi_board_info const *info, unsigned n); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
771 |
#else |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
772 |
/* board init code may ignore whether SPI is configured or not */ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
773 |
static inline int |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
774 |
spi_register_board_info(struct spi_board_info const *info, unsigned n) |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
775 |
{ return 0; } |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
776 |
#endif |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
777 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
778 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
779 |
/* If you're hotplugging an adapter with devices (parport, usb, etc) |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
780 |
* use spi_new_device() to describe each device. You can also call |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
781 |
* spi_unregister_device() to start making that device vanish, but |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
782 |
* normally that would be handled by spi_unregister_master(). |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
783 |
* |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
784 |
* You can also use spi_alloc_device() and spi_add_device() to use a two |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
785 |
* stage registration sequence for each spi_device. This gives the caller |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
786 |
* some more control over the spi_device structure before it is registered, |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
787 |
* but requires that caller to initialize fields that would otherwise |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
788 |
* be defined using the board info. |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
789 |
*/ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
790 |
extern struct spi_device * |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
791 |
spi_alloc_device(struct spi_master *master); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
792 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
793 |
extern int |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
794 |
spi_add_device(struct spi_device *spi); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
795 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
796 |
extern struct spi_device * |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
797 |
spi_new_device(struct spi_master *, struct spi_board_info *); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
798 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
799 |
static inline void |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
800 |
spi_unregister_device(struct spi_device *spi) |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
801 |
{ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
802 |
if (spi) |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
803 |
device_unregister(&spi->dev); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
804 |
} |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
805 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
806 |
#endif /* __LINUX_SPI_H */ |