forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
201 lines
4.8 KiB
201 lines
4.8 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
|
/* |
|
tda9840 - i2c-driver for the tda9840 by SGS Thomson |
|
|
|
Copyright (C) 1998-2003 Michael Hunold <[email protected]> |
|
Copyright (C) 2008 Hans Verkuil <[email protected]> |
|
|
|
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 <[email protected]>"); |
|
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);
|
|
|