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![Wolfram Sang](/assets/img/avatar_default.png)
Use the new APIs instead of the deprecated ones. Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
184 lines
4.9 KiB
C
184 lines
4.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* v4l2-i2c - I2C helpers for Video4Linux2
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*/
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#include <linux/i2c.h>
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#include <linux/module.h>
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#include <media/v4l2-common.h>
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#include <media/v4l2-device.h>
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void v4l2_i2c_subdev_unregister(struct v4l2_subdev *sd)
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{
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struct i2c_client *client = v4l2_get_subdevdata(sd);
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/*
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* We need to unregister the i2c client
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* explicitly. We cannot rely on
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* i2c_del_adapter to always unregister
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* clients for us, since if the i2c bus is a
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* platform bus, then it is never deleted.
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*
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* Device tree or ACPI based devices must not
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* be unregistered as they have not been
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* registered by us, and would not be
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* re-created by just probing the V4L2 driver.
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*/
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if (client && !client->dev.of_node && !client->dev.fwnode)
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i2c_unregister_device(client);
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}
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void v4l2_i2c_subdev_set_name(struct v4l2_subdev *sd,
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struct i2c_client *client,
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const char *devname, const char *postfix)
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{
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if (!devname)
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devname = client->dev.driver->name;
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if (!postfix)
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postfix = "";
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snprintf(sd->name, sizeof(sd->name), "%s%s %d-%04x", devname, postfix,
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i2c_adapter_id(client->adapter), client->addr);
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}
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EXPORT_SYMBOL_GPL(v4l2_i2c_subdev_set_name);
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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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sd->flags |= V4L2_SUBDEV_FL_IS_I2C;
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/* the owner is the same as the i2c_client's driver owner */
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sd->owner = client->dev.driver->owner;
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sd->dev = &client->dev;
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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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v4l2_i2c_subdev_set_name(sd, client, NULL, NULL);
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}
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EXPORT_SYMBOL_GPL(v4l2_i2c_subdev_init);
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/* Load an i2c sub-device. */
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struct v4l2_subdev
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*v4l2_i2c_new_subdev_board(struct v4l2_device *v4l2_dev,
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struct i2c_adapter *adapter,
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struct i2c_board_info *info,
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const unsigned short *probe_addrs)
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{
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struct v4l2_subdev *sd = NULL;
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struct i2c_client *client;
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if (!v4l2_dev)
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return NULL;
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request_module(I2C_MODULE_PREFIX "%s", info->type);
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/* Create the i2c client */
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if (info->addr == 0 && probe_addrs)
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client = i2c_new_scanned_device(adapter, info, probe_addrs,
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NULL);
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else
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client = i2c_new_client_device(adapter, info);
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/*
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* Note: by loading the module first we are certain that c->driver
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* will be set if the driver was found. If the module was not loaded
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* first, then the i2c core tries to delay-load the module for us,
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* and then c->driver is still NULL until the module is finally
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* loaded. This delay-load mechanism doesn't work if other drivers
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* want to use the i2c device, so explicitly loading the module
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* is the best alternative.
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*/
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if (!i2c_client_has_driver(client))
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goto error;
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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->dev.driver->owner))
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goto error;
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sd = i2c_get_clientdata(client);
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/*
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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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*/
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if (v4l2_device_register_subdev(v4l2_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->dev.driver->owner);
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error:
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/*
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* If we have a client but no subdev, then something went wrong and
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* we must unregister the client.
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*/
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if (!IS_ERR(client) && !sd)
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i2c_unregister_device(client);
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return sd;
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}
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EXPORT_SYMBOL_GPL(v4l2_i2c_new_subdev_board);
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struct v4l2_subdev *v4l2_i2c_new_subdev(struct v4l2_device *v4l2_dev,
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struct i2c_adapter *adapter,
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const char *client_type,
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u8 addr,
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const unsigned short *probe_addrs)
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{
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struct i2c_board_info info;
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/*
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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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*/
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memset(&info, 0, sizeof(info));
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strscpy(info.type, client_type, sizeof(info.type));
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info.addr = addr;
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return v4l2_i2c_new_subdev_board(v4l2_dev, adapter, &info,
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probe_addrs);
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}
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EXPORT_SYMBOL_GPL(v4l2_i2c_new_subdev);
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/* Return i2c client address of v4l2_subdev. */
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unsigned short v4l2_i2c_subdev_addr(struct v4l2_subdev *sd)
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{
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struct i2c_client *client = v4l2_get_subdevdata(sd);
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return client ? client->addr : I2C_CLIENT_END;
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}
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EXPORT_SYMBOL_GPL(v4l2_i2c_subdev_addr);
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/*
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* Return a list of I2C tuner addresses to probe. Use only if the tuner
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* addresses are unknown.
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*/
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const unsigned short *v4l2_i2c_tuner_addrs(enum v4l2_i2c_tuner_type type)
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{
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static const unsigned short radio_addrs[] = {
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#if IS_ENABLED(CONFIG_MEDIA_TUNER_TEA5761)
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0x10,
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#endif
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0x60,
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I2C_CLIENT_END
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};
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static const unsigned short demod_addrs[] = {
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0x42, 0x43, 0x4a, 0x4b,
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I2C_CLIENT_END
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};
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static const unsigned short tv_addrs[] = {
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0x42, 0x43, 0x4a, 0x4b, /* tda8290 */
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0x60, 0x61, 0x62, 0x63, 0x64,
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I2C_CLIENT_END
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};
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switch (type) {
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case ADDRS_RADIO:
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return radio_addrs;
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case ADDRS_DEMOD:
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return demod_addrs;
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case ADDRS_TV:
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return tv_addrs;
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case ADDRS_TV_WITH_DEMOD:
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return tv_addrs + 4;
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}
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return NULL;
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}
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EXPORT_SYMBOL_GPL(v4l2_i2c_tuner_addrs);
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