linux/drivers/media/i2c/tea6420.c
Thomas Gleixner 74ba9207e1 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 61
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>
2019-05-24 17:36:45 +02:00

143 lines
3.3 KiB
C

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