![Hans Verkuil](/assets/img/avatar_default.png)
You have to first detect the current rxsubchans (mono, stereo or bilingual), and depending on that you can set the audio mode. It does not automatically switch when the audio channels change. Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
225 lines
5.8 KiB
C
225 lines
5.8 KiB
C
/*
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tda9840 - i2c-driver for the tda9840 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 tda9840 is a stereo/dual sound processor with digital
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identification. It can be found at address 0x84 on the i2c-bus.
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For detailed informations download the specifications directly
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from SGS Thomson at http://www.st.com
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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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 <media/v4l2-chip-ident.h>
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MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
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MODULE_DESCRIPTION("tda9840 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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#define SWITCH 0x00
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#define LEVEL_ADJUST 0x02
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#define STEREO_ADJUST 0x03
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#define TEST 0x04
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#define TDA9840_SET_MUTE 0x00
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#define TDA9840_SET_MONO 0x10
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#define TDA9840_SET_STEREO 0x2a
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#define TDA9840_SET_LANG1 0x12
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#define TDA9840_SET_LANG2 0x1e
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#define TDA9840_SET_BOTH 0x1a
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#define TDA9840_SET_BOTH_R 0x16
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#define TDA9840_SET_EXTERNAL 0x7a
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static void tda9840_write(struct v4l2_subdev *sd, u8 reg, u8 val)
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{
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struct i2c_client *client = v4l2_get_subdevdata(sd);
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if (i2c_smbus_write_byte_data(client, reg, val))
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v4l2_dbg(1, debug, sd, "error writing %02x to %02x\n",
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val, reg);
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}
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static int tda9840_status(struct v4l2_subdev *sd)
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{
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struct i2c_client *client = v4l2_get_subdevdata(sd);
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u8 byte;
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if (1 != i2c_master_recv(client, &byte, 1)) {
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v4l2_dbg(1, debug, sd,
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"i2c_master_recv() failed\n");
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return -EIO;
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}
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if (byte & 0x80) {
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v4l2_dbg(1, debug, sd,
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"TDA9840_DETECT: register contents invalid\n");
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return -EINVAL;
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}
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v4l2_dbg(1, debug, sd, "TDA9840_DETECT: byte: 0x%02x\n", byte);
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return byte & 0x60;
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}
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static int tda9840_s_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *t)
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{
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int stat = tda9840_status(sd);
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int byte;
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if (t->index)
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return -EINVAL;
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stat = stat < 0 ? 0 : stat;
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if (stat == 0 || stat == 0x60) /* mono input */
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byte = TDA9840_SET_MONO;
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else if (stat == 0x40) /* stereo input */
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byte = (t->audmode == V4L2_TUNER_MODE_MONO) ?
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TDA9840_SET_MONO : TDA9840_SET_STEREO;
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else { /* bilingual */
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switch (t->audmode) {
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case V4L2_TUNER_MODE_LANG1_LANG2:
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byte = TDA9840_SET_BOTH;
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break;
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case V4L2_TUNER_MODE_LANG2:
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byte = TDA9840_SET_LANG2;
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break;
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default:
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byte = TDA9840_SET_LANG1;
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break;
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}
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}
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v4l2_dbg(1, debug, sd, "TDA9840_SWITCH: 0x%02x\n", byte);
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tda9840_write(sd, SWITCH, byte);
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return 0;
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}
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static int tda9840_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *t)
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{
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int stat = tda9840_status(sd);
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if (stat < 0)
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return stat;
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t->rxsubchans = V4L2_TUNER_SUB_MONO;
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switch (stat & 0x60) {
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case 0x00:
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t->rxsubchans = V4L2_TUNER_SUB_MONO;
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break;
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case 0x20:
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t->rxsubchans = V4L2_TUNER_SUB_LANG1 | V4L2_TUNER_SUB_LANG2;
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break;
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case 0x40:
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t->rxsubchans = V4L2_TUNER_SUB_STEREO | V4L2_TUNER_SUB_MONO;
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break;
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default: /* Incorrect detect */
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t->rxsubchans = V4L2_TUNER_MODE_MONO;
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break;
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}
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return 0;
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}
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static int tda9840_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip)
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{
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struct i2c_client *client = v4l2_get_subdevdata(sd);
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return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_TDA9840, 0);
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}
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/* ----------------------------------------------------------------------- */
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static const struct v4l2_subdev_core_ops tda9840_core_ops = {
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.g_chip_ident = tda9840_g_chip_ident,
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};
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static const struct v4l2_subdev_tuner_ops tda9840_tuner_ops = {
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.s_tuner = tda9840_s_tuner,
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.g_tuner = tda9840_g_tuner,
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};
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static const struct v4l2_subdev_ops tda9840_ops = {
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.core = &tda9840_core_ops,
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.tuner = &tda9840_tuner_ops,
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};
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/* ----------------------------------------------------------------------- */
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static int tda9840_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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/* let's see whether this adapter can support what we need */
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if (!i2c_check_functionality(client->adapter,
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I2C_FUNC_SMBUS_READ_BYTE_DATA |
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I2C_FUNC_SMBUS_WRITE_BYTE_DATA))
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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 = kzalloc(sizeof(struct v4l2_subdev), 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, &tda9840_ops);
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/* set initial values for level & stereo - adjustment, mode */
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tda9840_write(sd, LEVEL_ADJUST, 0);
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tda9840_write(sd, STEREO_ADJUST, 0);
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tda9840_write(sd, SWITCH, TDA9840_SET_STEREO);
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return 0;
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}
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static int tda9840_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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kfree(sd);
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return 0;
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}
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static const struct i2c_device_id tda9840_id[] = {
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{ "tda9840", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, tda9840_id);
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static struct i2c_driver tda9840_driver = {
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.driver = {
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.owner = THIS_MODULE,
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.name = "tda9840",
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},
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.probe = tda9840_probe,
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.remove = tda9840_remove,
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.id_table = tda9840_id,
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};
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module_i2c_driver(tda9840_driver);
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