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V4L/DVB (9821): v4l2-common: add i2c helper functions
Add helper functions to load i2c sub-devices, integrating them into the v4l2-framework. Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Hans Verkuil
Mauro Carvalho Chehab
parent
2a1fcdf082
commit
dd99120c71
@ -58,6 +58,7 @@
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#include <asm/div64.h>
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#define __OLD_VIDIOC_ /* To allow fixing old calls*/
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#include <media/v4l2-common.h>
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#include <media/v4l2-device.h>
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#include <media/v4l2-chip-ident.h>
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#include <linux/videodev2.h>
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@ -801,4 +802,116 @@ int v4l2_i2c_attach(struct i2c_adapter *adapter, int address, struct i2c_driver
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return err != -ENOMEM ? 0 : err;
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}
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EXPORT_SYMBOL(v4l2_i2c_attach);
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void v4l2_i2c_subdev_init(struct v4l2_subdev *sd, struct i2c_client *client,
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const struct v4l2_subdev_ops *ops)
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{
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v4l2_subdev_init(sd, ops);
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/* the owner is the same as the i2c_client's driver owner */
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sd->owner = client->driver->driver.owner;
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/* i2c_client and v4l2_subdev point to one another */
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v4l2_set_subdevdata(sd, client);
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i2c_set_clientdata(client, sd);
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/* initialize name */
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snprintf(sd->name, sizeof(sd->name), "%s %d-%04x",
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client->driver->driver.name, i2c_adapter_id(client->adapter),
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client->addr);
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}
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EXPORT_SYMBOL_GPL(v4l2_i2c_subdev_init);
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/* Load an i2c sub-device. It assumes that i2c_get_adapdata(adapter)
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returns the v4l2_device and that i2c_get_clientdata(client)
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returns the v4l2_subdev. */
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struct v4l2_subdev *v4l2_i2c_new_subdev(struct i2c_adapter *adapter,
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const char *module_name, const char *client_type, u8 addr)
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{
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struct v4l2_device *dev = i2c_get_adapdata(adapter);
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struct v4l2_subdev *sd = NULL;
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struct i2c_client *client;
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struct i2c_board_info info;
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BUG_ON(!dev);
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#ifdef MODULE
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if (module_name)
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request_module(module_name);
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#endif
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/* Setup the i2c board info with the device type and
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the device address. */
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memset(&info, 0, sizeof(info));
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strlcpy(info.type, client_type, sizeof(info.type));
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info.addr = addr;
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/* Create the i2c client */
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client = i2c_new_device(adapter, &info);
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/* Note: it is possible in the future that
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c->driver is NULL if the driver is still being loaded.
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We need better support from the kernel so that we
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can easily wait for the load to finish. */
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if (client == NULL || client->driver == NULL)
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return NULL;
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/* Lock the module so we can safely get the v4l2_subdev pointer */
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if (!try_module_get(client->driver->driver.owner))
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return NULL;
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sd = i2c_get_clientdata(client);
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/* Register with the v4l2_device which increases the module's
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use count as well. */
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if (v4l2_device_register_subdev(dev, sd))
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sd = NULL;
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/* Decrease the module use count to match the first try_module_get. */
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module_put(client->driver->driver.owner);
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return sd;
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}
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EXPORT_SYMBOL_GPL(v4l2_i2c_new_subdev);
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/* Probe and load an i2c sub-device. It assumes that i2c_get_adapdata(adapter)
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returns the v4l2_device and that i2c_get_clientdata(client)
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returns the v4l2_subdev. */
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struct v4l2_subdev *v4l2_i2c_new_probed_subdev(struct i2c_adapter *adapter,
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const char *module_name, const char *client_type,
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const unsigned short *addrs)
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{
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struct v4l2_device *dev = i2c_get_adapdata(adapter);
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struct v4l2_subdev *sd = NULL;
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struct i2c_client *client = NULL;
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struct i2c_board_info info;
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BUG_ON(!dev);
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#ifdef MODULE
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if (module_name)
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request_module(module_name);
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#endif
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/* Setup the i2c board info with the device type and
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the device address. */
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memset(&info, 0, sizeof(info));
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strlcpy(info.type, client_type, sizeof(info.type));
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/* Probe and create the i2c client */
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client = i2c_new_probed_device(adapter, &info, addrs);
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/* Note: it is possible in the future that
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c->driver is NULL if the driver is still being loaded.
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We need better support from the kernel so that we
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can easily wait for the load to finish. */
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if (client == NULL || client->driver == NULL)
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return NULL;
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/* Lock the module so we can safely get the v4l2_subdev pointer */
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if (!try_module_get(client->driver->driver.owner))
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return NULL;
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sd = i2c_get_clientdata(client);
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/* Register with the v4l2_device which increases the module's
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use count as well. */
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if (v4l2_device_register_subdev(dev, sd))
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sd = NULL;
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/* Decrease the module use count to match the first try_module_get. */
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module_put(client->driver->driver.owner);
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return sd;
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}
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EXPORT_SYMBOL_GPL(v4l2_i2c_new_probed_subdev);
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#endif
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@ -57,6 +57,29 @@
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/* ------------------------------------------------------------------------- */
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/* These printk constructs can be used with v4l2_device and v4l2_subdev */
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#define v4l2_printk(level, dev, fmt, arg...) \
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printk(level "%s: " fmt, (dev)->name , ## arg)
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#define v4l2_err(dev, fmt, arg...) \
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v4l2_printk(KERN_ERR, dev, fmt , ## arg)
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#define v4l2_warn(dev, fmt, arg...) \
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v4l2_printk(KERN_WARNING, dev, fmt , ## arg)
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#define v4l2_info(dev, fmt, arg...) \
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v4l2_printk(KERN_INFO, dev, fmt , ## arg)
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/* These three macros assume that the debug level is set with a module
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parameter called 'debug'. */
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#define v4l2_dbg(level, debug, dev, fmt, arg...) \
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do { \
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if (debug >= (level)) \
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v4l2_printk(KERN_DEBUG, dev, fmt , ## arg); \
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} while (0)
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/* ------------------------------------------------------------------------- */
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/* Priority helper functions */
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struct v4l2_prio_state {
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@ -104,11 +127,29 @@ struct i2c_driver;
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struct i2c_adapter;
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struct i2c_client;
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struct i2c_device_id;
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struct v4l2_device;
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struct v4l2_subdev;
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struct v4l2_subdev_ops;
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int v4l2_i2c_attach(struct i2c_adapter *adapter, int address, struct i2c_driver *driver,
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const char *name,
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int (*probe)(struct i2c_client *, const struct i2c_device_id *));
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/* Load an i2c module and return an initialized v4l2_subdev struct.
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Only call request_module if module_name != NULL.
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The client_type argument is the name of the chip that's on the adapter. */
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struct v4l2_subdev *v4l2_i2c_new_subdev(struct i2c_adapter *adapter,
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const char *module_name, const char *client_type, u8 addr);
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/* Probe and load an i2c module and return an initialized v4l2_subdev struct.
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Only call request_module if module_name != NULL.
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The client_type argument is the name of the chip that's on the adapter. */
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struct v4l2_subdev *v4l2_i2c_new_probed_subdev(struct i2c_adapter *adapter,
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const char *module_name, const char *client_type,
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const unsigned short *addrs);
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/* Initialize an v4l2_subdev with data from an i2c_client struct */
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void v4l2_i2c_subdev_init(struct v4l2_subdev *sd, struct i2c_client *client,
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const struct v4l2_subdev_ops *ops);
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/* ------------------------------------------------------------------------- */
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/* Internal ioctls */
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