aboutsummaryrefslogtreecommitdiff
path: root/drivers/media/video
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/media/video')
-rw-r--r--drivers/media/video/v4l2-common.c105
1 files changed, 105 insertions, 0 deletions
diff --git a/drivers/media/video/v4l2-common.c b/drivers/media/video/v4l2-common.c
index f96475626da..e7b443c116f 100644
--- a/drivers/media/video/v4l2-common.c
+++ b/drivers/media/video/v4l2-common.c
@@ -802,6 +802,17 @@ struct v4l2_subdev *v4l2_i2c_new_subdev(struct v4l2_device *v4l2_dev,
/* Decrease the module use count to match the first try_module_get. */
module_put(client->driver->driver.owner);
+ if (sd) {
+ /* We return errors from v4l2_subdev_call only if we have the
+ callback as the .s_config is not mandatory */
+ int err = v4l2_subdev_call(sd, core, s_config, 0, NULL);
+
+ if (err && err != -ENOIOCTLCMD) {
+ v4l2_device_unregister_subdev(sd);
+ sd = NULL;
+ }
+ }
+
error:
/* If we have a client but no subdev, then something went wrong and
we must unregister the client. */
@@ -852,6 +863,17 @@ struct v4l2_subdev *v4l2_i2c_new_probed_subdev(struct v4l2_device *v4l2_dev,
/* Decrease the module use count to match the first try_module_get. */
module_put(client->driver->driver.owner);
+ if (sd) {
+ /* We return errors from v4l2_subdev_call only if we have the
+ callback as the .s_config is not mandatory */
+ int err = v4l2_subdev_call(sd, core, s_config, 0, NULL);
+
+ if (err && err != -ENOIOCTLCMD) {
+ v4l2_device_unregister_subdev(sd);
+ sd = NULL;
+ }
+ }
+
error:
/* If we have a client but no subdev, then something went wrong and
we must unregister the client. */
@@ -872,6 +894,89 @@ struct v4l2_subdev *v4l2_i2c_new_probed_subdev_addr(struct v4l2_device *v4l2_dev
}
EXPORT_SYMBOL_GPL(v4l2_i2c_new_probed_subdev_addr);
+/* Load an i2c sub-device. */
+struct v4l2_subdev *v4l2_i2c_new_subdev_board(struct v4l2_device *v4l2_dev,
+ struct i2c_adapter *adapter, const char *module_name,
+ struct i2c_board_info *info, const unsigned short *probe_addrs)
+{
+ struct v4l2_subdev *sd = NULL;
+ struct i2c_client *client;
+
+ BUG_ON(!v4l2_dev);
+
+ if (module_name)
+ request_module(module_name);
+
+ /* Create the i2c client */
+ if (info->addr == 0 && probe_addrs)
+ client = i2c_new_probed_device(adapter, info, probe_addrs);
+ else
+ client = i2c_new_device(adapter, info);
+
+ /* Note: by loading the module first we are certain that c->driver
+ will be set if the driver was found. If the module was not loaded
+ first, then the i2c core tries to delay-load the module for us,
+ and then c->driver is still NULL until the module is finally
+ loaded. This delay-load mechanism doesn't work if other drivers
+ want to use the i2c device, so explicitly loading the module
+ is the best alternative. */
+ if (client == NULL || client->driver == NULL)
+ goto error;
+
+ /* Lock the module so we can safely get the v4l2_subdev pointer */
+ if (!try_module_get(client->driver->driver.owner))
+ goto error;
+ sd = i2c_get_clientdata(client);
+
+ /* 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(client->driver->driver.owner);
+
+ if (sd) {
+ /* We return errors from v4l2_subdev_call only if we have the
+ callback as the .s_config is not mandatory */
+ int err = v4l2_subdev_call(sd, core, s_config,
+ info->irq, info->platform_data);
+
+ if (err && err != -ENOIOCTLCMD) {
+ v4l2_device_unregister_subdev(sd);
+ sd = NULL;
+ }
+ }
+
+error:
+ /* If we have a client but no subdev, then something went wrong and
+ we must unregister the client. */
+ if (client && sd == NULL)
+ i2c_unregister_device(client);
+ return sd;
+}
+EXPORT_SYMBOL_GPL(v4l2_i2c_new_subdev_board);
+
+struct v4l2_subdev *v4l2_i2c_new_subdev_cfg(struct v4l2_device *v4l2_dev,
+ struct i2c_adapter *adapter,
+ const char *module_name, const char *client_type,
+ int irq, void *platform_data,
+ u8 addr, const unsigned short *probe_addrs)
+{
+ struct i2c_board_info info;
+
+ /* Setup the i2c board info with the device type and
+ the device address. */
+ memset(&info, 0, sizeof(info));
+ strlcpy(info.type, client_type, sizeof(info.type));
+ info.addr = addr;
+ info.irq = irq;
+ info.platform_data = platform_data;
+
+ return v4l2_i2c_new_subdev_board(v4l2_dev, adapter, module_name,
+ &info, probe_addrs);
+}
+EXPORT_SYMBOL_GPL(v4l2_i2c_new_subdev_cfg);
+
/* Return i2c client address of v4l2_subdev. */
unsigned short v4l2_i2c_subdev_addr(struct v4l2_subdev *sd)
{