diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/spi/spi.c | 33 |
1 files changed, 28 insertions, 5 deletions
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index 6657331eed9..c3219b29b5a 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -152,6 +152,11 @@ static void spi_drv_shutdown(struct device *dev) sdrv->shutdown(to_spi_device(dev)); } +/** + * spi_register_driver - register a SPI driver + * @sdrv: the driver to register + * Context: can sleep + */ int spi_register_driver(struct spi_driver *sdrv) { sdrv->driver.bus = &spi_bus_type; @@ -183,7 +188,13 @@ static LIST_HEAD(board_list); static DECLARE_MUTEX(board_lock); -/* On typical mainboards, this is purely internal; and it's not needed +/** + * spi_new_device - instantiate one new SPI device + * @master: Controller to which device is connected + * @chip: Describes the SPI device + * Context: can sleep + * + * On typical mainboards, this is purely internal; and it's not needed * after board init creates the hard-wired devices. Some development * platforms may not be able to use spi_register_board_info though, and * this is exported so that for example a USB or parport based adapter @@ -251,7 +262,12 @@ fail: } EXPORT_SYMBOL_GPL(spi_new_device); -/* +/** + * spi_register_board_info - register SPI devices for a given board + * @info: array of chip descriptors + * @n: how many descriptors are provided + * Context: can sleep + * * Board-specific early init code calls this (probably during arch_initcall) * with segments of the SPI device table. Any device nodes are created later, * after the relevant parent SPI controller (bus_num) is defined. We keep @@ -337,9 +353,10 @@ static struct class spi_master_class = { /** * spi_alloc_master - allocate SPI master controller * @dev: the controller, possibly using the platform_bus - * @size: how much driver-private data to preallocate; the pointer to this + * @size: how much zeroed driver-private data to allocate; the pointer to this * memory is in the class_data field of the returned class_device, * accessible with spi_master_get_devdata(). + * Context: can sleep * * This call is used only by SPI master controller drivers, which are the * only ones directly touching chip registers. It's how they allocate @@ -375,6 +392,7 @@ EXPORT_SYMBOL_GPL(spi_alloc_master); /** * spi_register_master - register SPI master controller * @master: initialized master, originally from spi_alloc_master() + * Context: can sleep * * SPI master controllers connect to their drivers using some non-SPI bus, * such as the platform bus. The final stage of probe() in that code @@ -437,6 +455,7 @@ static int __unregister(struct device *dev, void *unused) /** * spi_unregister_master - unregister SPI master controller * @master: the master being unregistered + * Context: can sleep * * This call is used only by SPI master controller drivers, which are the * only ones directly touching chip registers. @@ -455,6 +474,7 @@ EXPORT_SYMBOL_GPL(spi_unregister_master); /** * spi_busnum_to_master - look up master associated with bus_num * @bus_num: the master's bus number + * Context: can sleep * * This call may be used with devices that are registered after * arch init time. It returns a refcounted pointer to the relevant @@ -492,6 +512,7 @@ static void spi_complete(void *arg) * spi_sync - blocking/synchronous SPI data transfers * @spi: device with which data will be exchanged * @message: describes the data transfers + * Context: can sleep * * This call may only be used from a context that may sleep. The sleep * is non-interruptible, and has no timeout. Low-overhead controller @@ -508,7 +529,7 @@ static void spi_complete(void *arg) * * The return value is a negative error code if the message could not be * submitted, else zero. When the value is zero, then message->status is - * also defined: it's the completion code for the transfer, either zero + * also defined; it's the completion code for the transfer, either zero * or a negative error code from the controller driver. */ int spi_sync(struct spi_device *spi, struct spi_message *message) @@ -538,6 +559,7 @@ static u8 *buf; * @n_tx: size of txbuf, in bytes * @rxbuf: buffer into which data will be read * @n_rx: size of rxbuf, in bytes (need not be dma-safe) + * Context: can sleep * * This performs a half duplex MicroWire style transaction with the * device, sending txbuf and then reading rxbuf. The return value @@ -545,7 +567,8 @@ static u8 *buf; * This call may only be used from a context that may sleep. * * Parameters to this routine are always copied using a small buffer; - * performance-sensitive or bulk transfer code should instead use + * 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. */ int spi_write_then_read(struct spi_device *spi, |