diff options
-rw-r--r-- | drivers/spi/spi.c | 41 |
1 files changed, 32 insertions, 9 deletions
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index 11454d5..74825db 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -378,6 +378,8 @@ static void spi_drv_shutdown(struct device *dev) * spi_register_driver - register a SPI driver * @sdrv: the driver to register * Context: can sleep + * + * Return: zero on success, else a negative error code. */ int spi_register_driver(struct spi_driver *sdrv) { @@ -429,7 +431,7 @@ static DEFINE_MUTEX(board_lock); * needs to discard the spi_device without adding it, then it should * call spi_dev_put() on it. * - * Returns a pointer to the new device, or NULL. + * Return: a pointer to the new device, or NULL. */ struct spi_device *spi_alloc_device(struct spi_master *master) { @@ -488,7 +490,7 @@ static int spi_dev_check(struct device *dev, void *data) * Companion function to spi_alloc_device. Devices allocated with * spi_alloc_device can be added onto the spi bus with this function. * - * Returns 0 on success; negative errno on failure + * Return: 0 on success; negative errno on failure */ int spi_add_device(struct spi_device *spi) { @@ -561,7 +563,7 @@ EXPORT_SYMBOL_GPL(spi_add_device); * this is exported so that for example a USB or parport based adapter * driver could add devices (which it would learn about out-of-band). * - * Returns the new device, or NULL. + * Return: the new device, or NULL. */ struct spi_device *spi_new_device(struct spi_master *master, struct spi_board_info *chip) @@ -633,6 +635,8 @@ static void spi_match_master_to_boardinfo(struct spi_master *master, * * The board info passed can safely be __initdata ... but be careful of * any embedded pointers (platform_data, etc), they're copied as-is. + * + * Return: zero on success, else a negative error code. */ int spi_register_board_info(struct spi_board_info const *info, unsigned n) { @@ -1210,6 +1214,8 @@ static int spi_init_queue(struct spi_master *master) * * If there are more messages in the queue, the next message is returned from * this call. + * + * Return: the next message in the queue, else NULL if the queue is empty. */ struct spi_message *spi_get_next_queued_message(struct spi_master *master) { @@ -1373,6 +1379,8 @@ static int __spi_queued_transfer(struct spi_device *spi, * spi_queued_transfer - transfer function for queued transfers * @spi: spi device which is requesting transfer * @msg: spi message which is to handled is queued to driver queue + * + * Return: zero on success, else a negative error code. */ static int spi_queued_transfer(struct spi_device *spi, struct spi_message *msg) { @@ -1672,12 +1680,13 @@ static struct class spi_master_class = { * only ones directly touching chip registers. It's how they allocate * an spi_master structure, prior to calling spi_register_master(). * - * This must be called from context that can sleep. It returns the SPI - * master structure on success, else NULL. + * This must be called from context that can sleep. * * The caller is responsible for assigning the bus number and initializing * the master's methods before calling spi_register_master(); and (after errors * adding the device) calling spi_master_put() to prevent a memory leak. + * + * Return: the SPI master structure on success, else NULL. */ struct spi_master *spi_alloc_master(struct device *dev, unsigned size) { @@ -1761,6 +1770,8 @@ static int of_spi_register_master(struct spi_master *master) * success, else a negative error code (dropping the master's refcount). * After a successful return, the caller is responsible for calling * spi_unregister_master(). + * + * Return: zero on success, else a negative error code. */ int spi_register_master(struct spi_master *master) { @@ -1854,6 +1865,8 @@ static void devm_spi_unregister(struct device *dev, void *res) * * Register a SPI device as with spi_register_master() which will * automatically be unregister + * + * Return: zero on success, else a negative error code. */ int devm_spi_register_master(struct device *dev, struct spi_master *master) { @@ -1959,6 +1972,8 @@ static int __spi_master_match(struct device *dev, const void *data) * arch init time. It returns a refcounted pointer to the relevant * spi_master (which the caller must release), or NULL if there is * no such master registered. + * + * Return: the SPI master structure on success, else NULL. */ struct spi_master *spi_busnum_to_master(u16 bus_num) { @@ -2012,6 +2027,8 @@ static int __spi_validate_bits_per_word(struct spi_master *master, u8 bits_per_w * that the underlying controller or its driver does not support. For * example, not all hardware supports wire transfers using nine bit words, * LSB-first wire encoding, or active-high chipselects. + * + * Return: zero on success, else a negative error code. */ int spi_setup(struct spi_device *spi) { @@ -2230,6 +2247,8 @@ static int __spi_async(struct spi_device *spi, struct spi_message *message) * no other spi_message queued to that device will be processed. * (This rule applies equally to all the synchronous transfer calls, * which are wrappers around this core asynchronous primitive.) + * + * Return: zero on success, else a negative error code. */ int spi_async(struct spi_device *spi, struct spi_message *message) { @@ -2282,6 +2301,8 @@ EXPORT_SYMBOL_GPL(spi_async); * no other spi_message queued to that device will be processed. * (This rule applies equally to all the synchronous transfer calls, * which are wrappers around this core asynchronous primitive.) + * + * Return: zero on success, else a negative error code. */ int spi_async_locked(struct spi_device *spi, struct spi_message *message) { @@ -2397,7 +2418,7 @@ static int __spi_sync(struct spi_device *spi, struct spi_message *message, * Also, the caller is guaranteeing that the memory associated with the * message will not be freed before this call returns. * - * It returns zero on success, else a negative error code. + * Return: zero on success, else a negative error code. */ int spi_sync(struct spi_device *spi, struct spi_message *message) { @@ -2419,7 +2440,7 @@ EXPORT_SYMBOL_GPL(spi_sync); * SPI bus. It has to be preceded by a spi_bus_lock call. The SPI bus must * be released by a spi_bus_unlock call when the exclusive access is over. * - * It returns zero on success, else a negative error code. + * Return: zero on success, else a negative error code. */ int spi_sync_locked(struct spi_device *spi, struct spi_message *message) { @@ -2440,7 +2461,7 @@ EXPORT_SYMBOL_GPL(spi_sync_locked); * exclusive access is over. Data transfer must be done by spi_sync_locked * and spi_async_locked calls when the SPI bus lock is held. * - * It returns zero on success, else a negative error code. + * Return: always zero. */ int spi_bus_lock(struct spi_master *master) { @@ -2469,7 +2490,7 @@ EXPORT_SYMBOL_GPL(spi_bus_lock); * This call releases an SPI bus lock previously obtained by an spi_bus_lock * call. * - * It returns zero on success, else a negative error code. + * Return: always zero. */ int spi_bus_unlock(struct spi_master *master) { @@ -2504,6 +2525,8 @@ static u8 *buf; * portable code should never use this for more than 32 bytes. * Performance-sensitive or bulk transfer code should instead use * spi_{async,sync}() calls with dma-safe buffers. + * + * Return: zero on success, else a negative error code. */ int spi_write_then_read(struct spi_device *spi, const void *txbuf, unsigned n_tx, |