diff options
Diffstat (limited to 'include/linux/spi/spi.h')
| -rw-r--r-- | include/linux/spi/spi.h | 35 |
1 files changed, 31 insertions, 4 deletions
diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h index 935bd2854ff1..0a78745e5766 100644 --- a/include/linux/spi/spi.h +++ b/include/linux/spi/spi.h @@ -29,8 +29,8 @@ struct spi_transfer; struct spi_flash_read_message; /* - * INTERFACES between SPI master-side drivers and SPI infrastructure. - * (There's no SPI slave support for Linux yet...) + * INTERFACES between SPI master-side drivers and SPI slave protocol handlers, + * and SPI infrastructure. */ extern struct bus_type spi_bus_type; @@ -311,6 +311,7 @@ static inline void spi_unregister_driver(struct spi_driver *sdrv) * @min_speed_hz: Lowest supported transfer speed * @max_speed_hz: Highest supported transfer speed * @flags: other constraints relevant to this driver + * @slave: indicates that this is an SPI slave controller * @max_transfer_size: function that returns the max transfer size for * a &spi_device; may be %NULL, so the default %SIZE_MAX will be used. * @max_message_size: function that returns the max message size for @@ -374,6 +375,7 @@ static inline void spi_unregister_driver(struct spi_driver *sdrv) * @handle_err: the subsystem calls the driver to handle an error that occurs * in the generic implementation of transfer_one_message(). * @unprepare_message: undo any work done by prepare_message(). + * @slave_abort: abort the ongoing transfer request on an SPI slave controller * @spi_flash_read: to support spi-controller hardwares that provide * accelerated interface to read from flash devices. * @spi_flash_can_dma: analogous to can_dma() interface, but for @@ -447,6 +449,9 @@ struct spi_master { #define SPI_MASTER_MUST_TX BIT(4) /* requires tx */ #define SPI_MASTER_GPIO_SS BIT(5) /* GPIO CS must select slave */ + /* flag indicating this is an SPI slave controller */ + bool slave; + /* * on some hardware transfer / message size may be constrained * the limit may depend on device transfer settings @@ -539,6 +544,7 @@ struct spi_master { struct spi_message *message); int (*unprepare_message)(struct spi_master *master, struct spi_message *message); + int (*slave_abort)(struct spi_master *spi); int (*spi_flash_read)(struct spi_device *spi, struct spi_flash_read_message *msg); bool (*spi_flash_can_dma)(struct spi_device *spi, @@ -595,6 +601,11 @@ static inline void spi_master_put(struct spi_master *master) put_device(&master->dev); } +static inline bool spi_controller_is_slave(struct spi_master *ctlr) +{ + return IS_ENABLED(CONFIG_SPI_SLAVE) && ctlr->slave; +} + /* PM calls that need to be issued by the driver */ extern int spi_master_suspend(struct spi_master *master); extern int spi_master_resume(struct spi_master *master); @@ -605,8 +616,23 @@ extern void spi_finalize_current_message(struct spi_master *master); extern void spi_finalize_current_transfer(struct spi_master *master); /* the spi driver core manages memory for the spi_master classdev */ -extern struct spi_master * -spi_alloc_master(struct device *host, unsigned size); +extern struct spi_master *__spi_alloc_controller(struct device *host, + unsigned int size, bool slave); + +static inline struct spi_master *spi_alloc_master(struct device *host, + unsigned int size) +{ + return __spi_alloc_controller(host, size, false); +} + +static inline struct spi_master *spi_alloc_slave(struct device *host, + unsigned int size) +{ + if (!IS_ENABLED(CONFIG_SPI_SLAVE)) + return NULL; + + return __spi_alloc_controller(host, size, true); +} extern int spi_register_master(struct spi_master *master); extern int devm_spi_register_master(struct device *dev, @@ -912,6 +938,7 @@ extern int spi_setup(struct spi_device *spi); extern int spi_async(struct spi_device *spi, struct spi_message *message); extern int spi_async_locked(struct spi_device *spi, struct spi_message *message); +extern int spi_slave_abort(struct spi_device *spi); static inline size_t spi_max_message_size(struct spi_device *spi) |