diff options
| author | Mark Brown <broonie@linaro.org> | 2013-08-31 18:50:52 +0100 |
|---|---|---|
| committer | Mark Brown <broonie@linaro.org> | 2013-09-17 00:59:36 +0100 |
| commit | 666d5b4c742ba666eb68b467d777b7862f362ae5 (patch) | |
| tree | efb1a0d621991a55effac8cc4f61f669542308e2 | |
| parent | 272b98c6455f00884f0350f775c5342358ebb73f (diff) | |
| download | linux-666d5b4c742ba666eb68b467d777b7862f362ae5.tar.bz2 | |
spi: core: Add devm_spi_register_master()
Help simplify the cleanup code for SPI master drivers by providing a
managed master registration function, ensuring that the master is
automatically unregistered whenever the device is unbound.
Signed-off-by: Mark Brown <broonie@linaro.org>
| -rw-r--r-- | Documentation/driver-model/devres.txt | 3 | ||||
| -rw-r--r-- | drivers/spi/spi.c | 35 | ||||
| -rw-r--r-- | include/linux/spi/spi.h | 2 |
3 files changed, 40 insertions, 0 deletions
diff --git a/Documentation/driver-model/devres.txt b/Documentation/driver-model/devres.txt index fcb34a5697ea..84ea8216cc7d 100644 --- a/Documentation/driver-model/devres.txt +++ b/Documentation/driver-model/devres.txt @@ -302,3 +302,6 @@ PHY SLAVE DMA ENGINE devm_acpi_dma_controller_register() + +SPI + devm_spi_register_master() diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index 9e039c60c068..a586ceb111fc 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -1245,6 +1245,41 @@ done: } EXPORT_SYMBOL_GPL(spi_register_master); +static void devm_spi_unregister(struct device *dev, void *res) +{ + spi_unregister_master(*(struct spi_master **)res); +} + +/** + * dev_spi_register_master - register managed SPI master controller + * @dev: device managing SPI master + * @master: initialized master, originally from spi_alloc_master() + * Context: can sleep + * + * Register a SPI device as with spi_register_master() which will + * automatically be unregister + */ +int devm_spi_register_master(struct device *dev, struct spi_master *master) +{ + struct spi_master **ptr; + int ret; + + ptr = devres_alloc(devm_spi_unregister, sizeof(*ptr), GFP_KERNEL); + if (!ptr) + return -ENOMEM; + + ret = spi_register_master(master); + if (ret != 0) { + *ptr = master; + devres_add(dev, ptr); + } else { + devres_free(ptr); + } + + return ret; +} +EXPORT_SYMBOL_GPL(devm_spi_register_master); + static int __unregister(struct device *dev, void *null) { spi_unregister_device(to_spi_device(dev)); diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h index 887116dbce2c..4d634d66ba0b 100644 --- a/include/linux/spi/spi.h +++ b/include/linux/spi/spi.h @@ -434,6 +434,8 @@ extern struct spi_master * spi_alloc_master(struct device *host, unsigned size); extern int spi_register_master(struct spi_master *master); +extern int devm_spi_register_master(struct device *dev, + struct spi_master *master); extern void spi_unregister_master(struct spi_master *master); extern struct spi_master *spi_busnum_to_master(u16 busnum); |