diff options
| -rw-r--r-- | drivers/media/video/v4l2-common.c | 63 | ||||
| -rw-r--r-- | drivers/media/video/v4l2-device.c | 11 | ||||
| -rw-r--r-- | include/media/v4l2-common.h | 19 | ||||
| -rw-r--r-- | include/media/v4l2-subdev.h | 2 |
4 files changed, 95 insertions, 0 deletions
diff --git a/drivers/media/video/v4l2-common.c b/drivers/media/video/v4l2-common.c index 6a3d0b7..cd1f21d 100644 --- a/drivers/media/video/v4l2-common.c +++ b/drivers/media/video/v4l2-common.c @@ -51,6 +51,9 @@ #include <linux/string.h> #include <linux/errno.h> #include <linux/i2c.h> +#if defined(CONFIG_SPI) +#include <linux/spi/spi.h> +#endif #include <asm/uaccess.h> #include <asm/system.h> #include <asm/pgtable.h> @@ -955,6 +958,66 @@ EXPORT_SYMBOL_GPL(v4l2_i2c_tuner_addrs); #endif /* defined(CONFIG_I2C) */ +#if defined(CONFIG_SPI) + +/* Load a spi sub-device. */ + +void v4l2_spi_subdev_init(struct v4l2_subdev *sd, struct spi_device *spi, + const struct v4l2_subdev_ops *ops) +{ + v4l2_subdev_init(sd, ops); + sd->flags |= V4L2_SUBDEV_FL_IS_SPI; + /* the owner is the same as the spi_device's driver owner */ + sd->owner = spi->dev.driver->owner; + /* spi_device and v4l2_subdev point to one another */ + v4l2_set_subdevdata(sd, spi); + spi_set_drvdata(spi, sd); + /* initialize name */ + strlcpy(sd->name, spi->dev.driver->name, sizeof(sd->name)); +} +EXPORT_SYMBOL_GPL(v4l2_spi_subdev_init); + +struct v4l2_subdev *v4l2_spi_new_subdev(struct v4l2_device *v4l2_dev, + struct spi_master *master, struct spi_board_info *info) +{ + struct v4l2_subdev *sd = NULL; + struct spi_device *spi = NULL; + + BUG_ON(!v4l2_dev); + + if (info->modalias) + request_module(info->modalias); + + spi = spi_new_device(master, info); + + if (spi == NULL || spi->dev.driver == NULL) + goto error; + + if (!try_module_get(spi->dev.driver->owner)) + goto error; + + sd = spi_get_drvdata(spi); + + /* Register with the v4l2_device which increases the module's + use count as well. */ + if (v4l2_device_register_subdev(v4l2_dev, sd)) + sd = NULL; + + /* Decrease the module use count to match the first try_module_get. */ + module_put(spi->dev.driver->owner); + +error: + /* If we have a client but no subdev, then something went wrong and + we must unregister the client. */ + if (spi && sd == NULL) + spi_unregister_device(spi); + + return sd; +} +EXPORT_SYMBOL_GPL(v4l2_spi_new_subdev); + +#endif /* defined(CONFIG_SPI) */ + /* Clamp x to be between min and max, aligned to a multiple of 2^align. min * and max don't have to be aligned, but there must be at least one valid * value. E.g., min=17,max=31,align=4 is not allowed as there are no multiples diff --git a/drivers/media/video/v4l2-device.c b/drivers/media/video/v4l2-device.c index 0d06e7c..5a7dc4a 100644 --- a/drivers/media/video/v4l2-device.c +++ b/drivers/media/video/v4l2-device.c @@ -21,6 +21,9 @@ #include <linux/types.h> #include <linux/ioctl.h> #include <linux/i2c.h> +#if defined(CONFIG_SPI) +#include <linux/spi/spi.h> +#endif #include <linux/videodev2.h> #include <media/v4l2-device.h> @@ -97,6 +100,14 @@ void v4l2_device_unregister(struct v4l2_device *v4l2_dev) i2c_unregister_device(client); } #endif +#if defined(CONFIG_SPI) + if (sd->flags & V4L2_SUBDEV_FL_IS_SPI) { + struct spi_device *spi = v4l2_get_subdevdata(sd); + + if (spi) + spi_unregister_device(spi); + } +#endif } } EXPORT_SYMBOL_GPL(v4l2_device_unregister); diff --git a/include/media/v4l2-common.h b/include/media/v4l2-common.h index 1c7b259..3b2efdc 100644 --- a/include/media/v4l2-common.h +++ b/include/media/v4l2-common.h @@ -184,6 +184,25 @@ const unsigned short *v4l2_i2c_tuner_addrs(enum v4l2_i2c_tuner_type type); /* ------------------------------------------------------------------------- */ +/* SPI Helper functions */ +#if defined(CONFIG_SPI) + +#include <linux/spi/spi.h> + +struct spi_device; + +/* Load an spi module and return an initialized v4l2_subdev struct. + The client_type argument is the name of the chip that's on the adapter. */ +struct v4l2_subdev *v4l2_spi_new_subdev(struct v4l2_device *v4l2_dev, + struct spi_master *master, struct spi_board_info *info); + +/* Initialize an v4l2_subdev with data from an spi_device struct */ +void v4l2_spi_subdev_init(struct v4l2_subdev *sd, struct spi_device *spi, + const struct v4l2_subdev_ops *ops); +#endif + +/* ------------------------------------------------------------------------- */ + /* Note: these remaining ioctls/structs should be removed as well, but they are still used in tuner-simple.c (TUNER_SET_CONFIG), cx18/ivtv (RESET) and v4l2-int-device.h (v4l2_routing). To remove these ioctls some more cleanup diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h index 2bcdca0..0975878 100644 --- a/include/media/v4l2-subdev.h +++ b/include/media/v4l2-subdev.h @@ -387,6 +387,8 @@ struct v4l2_subdev_ops { /* Set this flag if this subdev is a i2c device. */ #define V4L2_SUBDEV_FL_IS_I2C (1U << 0) +/* Set this flag if this subdev is a spi device. */ +#define V4L2_SUBDEV_FL_IS_SPI (1U << 1) /* Each instance of a subdev driver should create this struct, either stand-alone or embedded in a larger struct. |
