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V4L/DVB (12125): v4l2: add new s_config subdev ops and v4l2_i2c_new_subdev_cfg/board calls

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Add a new s_config core ops call: this is called with the irq and platform
data to be used to initialize the subdev.

Added new v4l2_i2c_new_subdev_cfg and v4l2_i2c_new_subdev_board calls
that allows you to pass these new arguments.

The existing v4l2_i2c_new_subdev functions were modified to also call
s_config.

In the future the existing v4l2_i2c_new_subdev functions will be replaced
by a single v4l2_i2c_new_subdev function similar to v4l2_i2c_new_subdev_cfg
but without the irq and platform_data arguments.

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Hans Verkuil 2009-06-09 17:12:33 -03:00 committed by Mauro Carvalho Chehab
parent 90135c9686
commit f0222c7d86
3 changed files with 127 additions and 1 deletions
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105
drivers/media/video/v4l2-common.c
View File

@ -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)
{

16
include/media/v4l2-common.h
View File

@ -153,6 +153,22 @@ struct v4l2_subdev *v4l2_i2c_new_probed_subdev(struct v4l2_device *v4l2_dev,
struct v4l2_subdev *v4l2_i2c_new_probed_subdev_addr(struct v4l2_device *v4l2_dev,
struct i2c_adapter *adapter,
const char *module_name, const char *client_type, u8 addr);
/* Load an i2c module and return an initialized v4l2_subdev struct.
Only call request_module if module_name != NULL.
The client_type argument is the name of the chip that's on the adapter. */
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;
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);
/* Initialize an v4l2_subdev with data from an i2c_client struct */
void v4l2_i2c_subdev_init(struct v4l2_subdev *sd, struct i2c_client *client,
const struct v4l2_subdev_ops *ops);

7
include/media/v4l2-subdev.h
View File

@ -79,7 +79,11 @@ struct v4l2_decode_vbi_line {
not yet implemented) since ops provide proper type-checking.
*/
/* init: initialize the sensor registors to some sort of reasonable default
/* s_config: if set, then it is always called by the v4l2_i2c_new_subdev*
functions after the v4l2_subdev was registered. It is used to pass
platform data to the subdev which can be used during initialization.
init: initialize the sensor registors to some sort of reasonable default
values. Do not use for new drivers and should be removed in existing
drivers.
@ -96,6 +100,7 @@ struct v4l2_decode_vbi_line {
struct v4l2_subdev_core_ops {
int (*g_chip_ident)(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip);
int (*log_status)(struct v4l2_subdev *sd);
int (*s_config)(struct v4l2_subdev *sd, int irq, void *platform_data);
int (*init)(struct v4l2_subdev *sd, u32 val);
int (*load_fw)(struct v4l2_subdev *sd);
int (*reset)(struct v4l2_subdev *sd, u32 val);