linux/drivers/media/i2c/tda9840.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

202 lines
4.8 KiB
C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
tda9840 - i2c-driver for the tda9840 by SGS Thomson
Copyright (C) 1998-2003 Michael Hunold <michael@mihu.de>
Copyright (C) 2008 Hans Verkuil <hverkuil@xs4all.nl>
The tda9840 is a stereo/dual sound processor with digital
identification. It can be found at address 0x84 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>
MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
MODULE_DESCRIPTION("tda9840 driver");
MODULE_LICENSE("GPL");
static int debug;
module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "Debug level (0-1)");
#define SWITCH 0x00
#define LEVEL_ADJUST 0x02
#define STEREO_ADJUST 0x03
#define TEST 0x04
#define TDA9840_SET_MUTE 0x00
#define TDA9840_SET_MONO 0x10
#define TDA9840_SET_STEREO 0x2a
#define TDA9840_SET_LANG1 0x12
#define TDA9840_SET_LANG2 0x1e
#define TDA9840_SET_BOTH 0x1a
#define TDA9840_SET_BOTH_R 0x16
#define TDA9840_SET_EXTERNAL 0x7a
static void tda9840_write(struct v4l2_subdev *sd, u8 reg, u8 val)
{
struct i2c_client *client = v4l2_get_subdevdata(sd);
if (i2c_smbus_write_byte_data(client, reg, val))
v4l2_dbg(1, debug, sd, "error writing %02x to %02x\n",
val, reg);
}
static int tda9840_status(struct v4l2_subdev *sd)
{
struct i2c_client *client = v4l2_get_subdevdata(sd);
int rc;
u8 byte;
rc = i2c_master_recv(client, &byte, 1);
if (rc != 1) {
v4l2_dbg(1, debug, sd,
"i2c_master_recv() failed\n");
if (rc < 0)
return rc;
return -EIO;
}
if (byte & 0x80) {
v4l2_dbg(1, debug, sd,
"TDA9840_DETECT: register contents invalid\n");
return -EINVAL;
}
v4l2_dbg(1, debug, sd, "TDA9840_DETECT: byte: 0x%02x\n", byte);
return byte & 0x60;
}
static int tda9840_s_tuner(struct v4l2_subdev *sd, const struct v4l2_tuner *t)
{
int stat = tda9840_status(sd);
int byte;
if (t->index)
return -EINVAL;
stat = stat < 0 ? 0 : stat;
if (stat == 0 || stat == 0x60) /* mono input */
byte = TDA9840_SET_MONO;
else if (stat == 0x40) /* stereo input */
byte = (t->audmode == V4L2_TUNER_MODE_MONO) ?
TDA9840_SET_MONO : TDA9840_SET_STEREO;
else { /* bilingual */
switch (t->audmode) {
case V4L2_TUNER_MODE_LANG1_LANG2:
byte = TDA9840_SET_BOTH;
break;
case V4L2_TUNER_MODE_LANG2:
byte = TDA9840_SET_LANG2;
break;
default:
byte = TDA9840_SET_LANG1;
break;
}
}
v4l2_dbg(1, debug, sd, "TDA9840_SWITCH: 0x%02x\n", byte);
tda9840_write(sd, SWITCH, byte);
return 0;
}
static int tda9840_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *t)
{
int stat = tda9840_status(sd);
if (stat < 0)
return stat;
t->rxsubchans = V4L2_TUNER_SUB_MONO;
switch (stat & 0x60) {
case 0x00:
t->rxsubchans = V4L2_TUNER_SUB_MONO;
break;
case 0x20:
t->rxsubchans = V4L2_TUNER_SUB_LANG1 | V4L2_TUNER_SUB_LANG2;
break;
case 0x40:
t->rxsubchans = V4L2_TUNER_SUB_STEREO | V4L2_TUNER_SUB_MONO;
break;
default: /* Incorrect detect */
t->rxsubchans = V4L2_TUNER_MODE_MONO;
break;
}
return 0;
}
/* ----------------------------------------------------------------------- */
static const struct v4l2_subdev_tuner_ops tda9840_tuner_ops = {
.s_tuner = tda9840_s_tuner,
.g_tuner = tda9840_g_tuner,
};
static const struct v4l2_subdev_ops tda9840_ops = {
.tuner = &tda9840_tuner_ops,
};
/* ----------------------------------------------------------------------- */
static int tda9840_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct v4l2_subdev *sd;
/* let's see whether this adapter can support what we need */
if (!i2c_check_functionality(client->adapter,
I2C_FUNC_SMBUS_READ_BYTE_DATA |
I2C_FUNC_SMBUS_WRITE_BYTE_DATA))
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, &tda9840_ops);
/* set initial values for level & stereo - adjustment, mode */
tda9840_write(sd, LEVEL_ADJUST, 0);
tda9840_write(sd, STEREO_ADJUST, 0);
tda9840_write(sd, SWITCH, TDA9840_SET_STEREO);
return 0;
}
static int tda9840_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 tda9840_id[] = {
{ "tda9840", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, tda9840_id);
static struct i2c_driver tda9840_driver = {
.driver = {
.name = "tda9840",
},
.probe = tda9840_probe,
.remove = tda9840_remove,
.id_table = tda9840_id,
};
module_i2c_driver(tda9840_driver);