142 lines
3.3 KiB
C
142 lines
3.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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tea6420 - i2c-driver for the tea6420 by SGS Thomson
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Copyright (C) 1998-2003 Michael Hunold <michael@mihu.de>
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Copyright (C) 2008 Hans Verkuil <hverkuil@xs4all.nl>
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The tea6420 is a bus controlled audio-matrix with 5 stereo inputs,
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4 stereo outputs and gain control for each output.
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It is cascadable, i.e. it can be found at the addresses 0x98
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and 0x9a on the i2c-bus.
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For detailed information download the specifications directly
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from SGS Thomson at http://www.st.com
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*/
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#include <linux/module.h>
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#include <linux/ioctl.h>
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#include <linux/slab.h>
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#include <linux/i2c.h>
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#include <media/v4l2-device.h>
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#include "tea6420.h"
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MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
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MODULE_DESCRIPTION("tea6420 driver");
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MODULE_LICENSE("GPL");
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static int debug;
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module_param(debug, int, 0644);
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MODULE_PARM_DESC(debug, "Debug level (0-1)");
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/* make a connection between the input 'i' and the output 'o'
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with gain 'g' (note: i = 6 means 'mute') */
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static int tea6420_s_routing(struct v4l2_subdev *sd,
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u32 i, u32 o, u32 config)
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{
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struct i2c_client *client = v4l2_get_subdevdata(sd);
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int g = (o >> 4) & 0xf;
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u8 byte;
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int ret;
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o &= 0xf;
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v4l2_dbg(1, debug, sd, "i=%d, o=%d, g=%d\n", i, o, g);
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/* check if the parameters are valid */
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if (i < 1 || i > 6 || o < 1 || o > 4 || g < 0 || g > 6 || g % 2 != 0)
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return -EINVAL;
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byte = ((o - 1) << 5);
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byte |= (i - 1);
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/* to understand this, have a look at the tea6420-specs (p.5) */
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switch (g) {
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case 0:
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byte |= (3 << 3);
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break;
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case 2:
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byte |= (2 << 3);
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break;
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case 4:
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byte |= (1 << 3);
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break;
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case 6:
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break;
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}
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ret = i2c_smbus_write_byte(client, byte);
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if (ret) {
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v4l2_dbg(1, debug, sd,
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"i2c_smbus_write_byte() failed, ret:%d\n", ret);
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return -EIO;
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}
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return 0;
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}
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/* ----------------------------------------------------------------------- */
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static const struct v4l2_subdev_audio_ops tea6420_audio_ops = {
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.s_routing = tea6420_s_routing,
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};
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static const struct v4l2_subdev_ops tea6420_ops = {
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.audio = &tea6420_audio_ops,
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};
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static int tea6420_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct v4l2_subdev *sd;
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int err, i;
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/* let's see whether this adapter can support what we need */
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if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WRITE_BYTE))
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return -EIO;
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v4l_info(client, "chip found @ 0x%x (%s)\n",
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client->addr << 1, client->adapter->name);
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sd = devm_kzalloc(&client->dev, sizeof(*sd), GFP_KERNEL);
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if (sd == NULL)
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return -ENOMEM;
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v4l2_i2c_subdev_init(sd, client, &tea6420_ops);
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/* set initial values: set "mute"-input to all outputs at gain 0 */
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err = 0;
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for (i = 1; i < 5; i++)
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err += tea6420_s_routing(sd, 6, i, 0);
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if (err) {
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v4l_dbg(1, debug, client, "could not initialize tea6420\n");
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return -ENODEV;
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}
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return 0;
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}
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static void tea6420_remove(struct i2c_client *client)
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{
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struct v4l2_subdev *sd = i2c_get_clientdata(client);
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v4l2_device_unregister_subdev(sd);
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}
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static const struct i2c_device_id tea6420_id[] = {
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{ "tea6420", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, tea6420_id);
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static struct i2c_driver tea6420_driver = {
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.driver = {
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.name = "tea6420",
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},
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.probe = tea6420_probe,
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.remove = tea6420_remove,
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.id_table = tea6420_id,
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};
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module_i2c_driver(tea6420_driver);
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