diff options
| -rw-r--r-- | drivers/media/dvb-core/dvbdev.c | 48 | ||||
| -rw-r--r-- | include/media/dvbdev.h | 65 |
2 files changed, 111 insertions, 2 deletions
diff --git a/drivers/media/dvb-core/dvbdev.c b/drivers/media/dvb-core/dvbdev.c index 60e9c2ba26be..a840133feacb 100644 --- a/drivers/media/dvb-core/dvbdev.c +++ b/drivers/media/dvb-core/dvbdev.c @@ -24,6 +24,7 @@ #include <linux/string.h> #include <linux/module.h> #include <linux/kernel.h> +#include <linux/i2c.h> #include <linux/init.h> #include <linux/slab.h> #include <linux/device.h> @@ -941,6 +942,53 @@ out: return err; } +#ifdef CONFIG_I2C +struct i2c_client *dvb_module_probe(const char *module_name, + const char *name, + struct i2c_adapter *adap, + unsigned char addr, + void *platform_data) +{ + struct i2c_client *client; + struct i2c_board_info *board_info; + + board_info = kzalloc(sizeof(*board_info), GFP_KERNEL); + + if (name) + strlcpy(board_info->type, name, I2C_NAME_SIZE); + else + strlcpy(board_info->type, module_name, I2C_NAME_SIZE); + + board_info->addr = addr; + board_info->platform_data = platform_data; + request_module(module_name); + client = i2c_new_device(adap, board_info); + if (client == NULL || client->dev.driver == NULL) { + kfree(board_info); + return NULL; + } + + if (!try_module_get(client->dev.driver->owner)) { + i2c_unregister_device(client); + client = NULL; + } + + kfree(board_info); + return client; +} +EXPORT_SYMBOL_GPL(dvb_module_probe); + +void dvb_module_release(struct i2c_client *client) +{ + if (!client) + return; + + module_put(client->dev.driver->owner); + i2c_unregister_device(client); +} +EXPORT_SYMBOL_GPL(dvb_module_release); +#endif + static int dvb_uevent(struct device *dev, struct kobj_uevent_env *env) { struct dvb_device *dvbdev = dev_get_drvdata(dev); diff --git a/include/media/dvbdev.h b/include/media/dvbdev.h index 554db879527f..2d2897508590 100644 --- a/include/media/dvbdev.h +++ b/include/media/dvbdev.h @@ -358,7 +358,61 @@ long dvb_generic_ioctl(struct file *file, int dvb_usercopy(struct file *file, unsigned int cmd, unsigned long arg, int (*func)(struct file *file, unsigned int cmd, void *arg)); -/** generic DVB attach function. */ +#ifdef CONFIG_I2C + +struct i2c_adapter; +struct i2c_client; +/** + * dvb_module_probe - helper routine to probe an I2C module + * + * @module_name: + * Name of the I2C module to be probed + * @name: + * Optional name for the I2C module. Used for debug purposes. + * If %NULL, defaults to @module_name. + * @adap: + * pointer to &struct i2c_adapter that describes the I2C adapter where + * the module will be bound. + * @addr: + * I2C address of the adapter, in 7-bit notation. + * @platform_data: + * Platform data to be passed to the I2C module probed. + * + * This function binds an I2C device into the DVB core. Should be used by + * all drivers that use I2C bus to control the hardware. A module bound + * with dvb_module_probe() should use dvb_module_release() to unbind. + * + * Return: + * On success, return an &struct i2c_client, pointing the the bound + * I2C device. %NULL otherwise. + * + * .. note:: + * + * In the past, DVB modules (mainly, frontends) were bound via dvb_attach() + * macro, with does an ugly hack, using I2C low level functions. Such + * usage is deprecated and will be removed soon. Instead, use this routine. + */ +struct i2c_client *dvb_module_probe(const char *module_name, + const char *name, + struct i2c_adapter *adap, + unsigned char addr, + void *platform_data); + +/** + * dvb_module_release - releases an I2C device allocated with + * dvb_module_probe(). + * + * @client: pointer to &struct i2c_client with the I2C client to be released. + * can be %NULL. + * + * This function should be used to free all resources reserved by + * dvb_module_probe() and unbinding the I2C hardware. + */ +void dvb_module_release(struct i2c_client *client); + +#endif /* CONFIG_I2C */ + +/* Legacy generic DVB attach function. */ #ifdef CONFIG_MEDIA_ATTACH /** @@ -371,6 +425,13 @@ int dvb_usercopy(struct file *file, unsigned int cmd, unsigned long arg, * the @FUNCTION function there, with @ARGS. * As it increments symbol usage cont, at unregister, dvb_detach() * should be called. + * + * .. note:: + * + * In the past, DVB modules (mainly, frontends) were bound via dvb_attach() + * macro, with does an ugly hack, using I2C low level functions. Such + * usage is deprecated and will be removed soon. Instead, you should use + * dvb_module_probe(). */ #define dvb_attach(FUNCTION, ARGS...) ({ \ void *__r = NULL; \ @@ -402,6 +463,6 @@ int dvb_usercopy(struct file *file, unsigned int cmd, unsigned long arg, #define dvb_detach(FUNC) {} -#endif +#endif /* CONFIG_MEDIA_ATTACH */ #endif /* #ifndef _DVBDEV_H_ */ |