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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* v4l2-i2c - I2C helpers for Video4Linux2
*/
#include <linux/i2c.h>
#include <linux/module.h>
#include <media/v4l2-common.h>
#include <media/v4l2-device.h>
void v4l2_i2c_subdev_unregister(struct v4l2_subdev *sd)
{
struct i2c_client *client = v4l2_get_subdevdata(sd);
/*
* We need to unregister the i2c client
* explicitly. We cannot rely on
* i2c_del_adapter to always unregister
* clients for us, since if the i2c bus is a
* platform bus, then it is never deleted.
*
* Device tree or ACPI based devices must not
* be unregistered as they have not been
* registered by us, and would not be
* re-created by just probing the V4L2 driver.
*/
if (client && !client->dev.of_node && !client->dev.fwnode)
i2c_unregister_device(client);
}
void v4l2_i2c_subdev_set_name(struct v4l2_subdev *sd,
struct i2c_client *client,
const char *devname, const char *postfix)
{
if (!devname)
devname = client->dev.driver->name;
if (!postfix)
postfix = "";
snprintf(sd->name, sizeof(sd->name), "%s%s %d-%04x", devname, postfix,
i2c_adapter_id(client->adapter), client->addr);
}
EXPORT_SYMBOL_GPL(v4l2_i2c_subdev_set_name);
void v4l2_i2c_subdev_init(struct v4l2_subdev *sd, struct i2c_client *client,
const struct v4l2_subdev_ops *ops)
{
v4l2_subdev_init(sd, ops);
sd->flags |= V4L2_SUBDEV_FL_IS_I2C;
/* the owner is the same as the i2c_client's driver owner */
sd->owner = client->dev.driver->owner;
sd->dev = &client->dev;
/* i2c_client and v4l2_subdev point to one another */
v4l2_set_subdevdata(sd, client);
i2c_set_clientdata(client, sd);
v4l2_i2c_subdev_set_name(sd, client, NULL, NULL);
}
EXPORT_SYMBOL_GPL(v4l2_i2c_subdev_init);
/* Load an i2c sub-device. */
struct v4l2_subdev
*v4l2_i2c_new_subdev_board(struct v4l2_device *v4l2_dev,
struct i2c_adapter *adapter,
struct i2c_board_info *info,
const unsigned short *probe_addrs)
{
struct v4l2_subdev *sd = NULL;
struct i2c_client *client;
if (!v4l2_dev)
return NULL;
request_module(I2C_MODULE_PREFIX "%s", info->type);
/* Create the i2c client */
if (info->addr == 0 && probe_addrs)
client = i2c_new_scanned_device(adapter, info, probe_addrs,
NULL);
else
client = i2c_new_client_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 (!i2c_client_has_driver(client))
goto error;
/* Lock the module so we can safely get the v4l2_subdev pointer */
if (!try_module_get(client->dev.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->dev.driver->owner);
error:
/*
* If we have a client but no subdev, then something went wrong and
* we must unregister the client.
*/
if (!IS_ERR(client) && !sd)
i2c_unregister_device(client);
return sd;
}
EXPORT_SYMBOL_GPL(v4l2_i2c_new_subdev_board);
struct v4l2_subdev *v4l2_i2c_new_subdev(struct v4l2_device *v4l2_dev,
struct i2c_adapter *adapter,
const char *client_type,
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));
strscpy(info.type, client_type, sizeof(info.type));
info.addr = addr;
return v4l2_i2c_new_subdev_board(v4l2_dev, adapter, &info,
probe_addrs);
}
EXPORT_SYMBOL_GPL(v4l2_i2c_new_subdev);
/* Return i2c client address of v4l2_subdev. */
unsigned short v4l2_i2c_subdev_addr(struct v4l2_subdev *sd)
{
struct i2c_client *client = v4l2_get_subdevdata(sd);
return client ? client->addr : I2C_CLIENT_END;
}
EXPORT_SYMBOL_GPL(v4l2_i2c_subdev_addr);
/*
* Return a list of I2C tuner addresses to probe. Use only if the tuner
* addresses are unknown.
*/
const unsigned short *v4l2_i2c_tuner_addrs(enum v4l2_i2c_tuner_type type)
{
static const unsigned short radio_addrs[] = {
#if IS_ENABLED(CONFIG_MEDIA_TUNER_TEA5761)
0x10,
#endif
0x60,
I2C_CLIENT_END
};
static const unsigned short demod_addrs[] = {
0x42, 0x43, 0x4a, 0x4b,
I2C_CLIENT_END
};
static const unsigned short tv_addrs[] = {
0x42, 0x43, 0x4a, 0x4b, /* tda8290 */
0x60, 0x61, 0x62, 0x63, 0x64,
I2C_CLIENT_END
};
switch (type) {
case ADDRS_RADIO:
return radio_addrs;
case ADDRS_DEMOD:
return demod_addrs;
case ADDRS_TV:
return tv_addrs;
case ADDRS_TV_WITH_DEMOD:
return tv_addrs + 4;
}
return NULL;
}
EXPORT_SYMBOL_GPL(v4l2_i2c_tuner_addrs);
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