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Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not write to the free software foundation inc 675 mass ave cambridge ma 02139 usa extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 441 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc) Reviewed-by: Richard Fontana <rfontana@redhat.com> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190520071858.739733335@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
143 lines
3.3 KiB
C
143 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 int 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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return 0;
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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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