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Linus Torvalds1da177e2005-04-16 15:20:36 -07001 /*
2 tda9840 - i2c-driver for the tda9840 by SGS Thomson
3
4 Copyright (C) 1998-2003 Michael Hunold <michael@mihu.de>
Hans Verkuila8327812008-07-25 10:31:23 -03005 Copyright (C) 2008 Hans Verkuil <hverkuil@xs4all.nl>
Linus Torvalds1da177e2005-04-16 15:20:36 -07006
7 The tda9840 is a stereo/dual sound processor with digital
8 identification. It can be found at address 0x84 on the i2c-bus.
9
10 For detailed informations download the specifications directly
11 from SGS Thomson at http://www.st.com
12
13 This program is free software; you can redistribute it and/or modify
14 it under the terms of the GNU General Public License as published by
15 the Free Software Foundation; either version 2 of the License, or
16 (at your option) any later version.
17
18 This program is distributed in the hope that it will be useful,
19 but WITHOUT ANY WARRANTY; without even the implied warranty of
20 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 GNU General Public License for more details.
22
23 You should have received a copy of the GNU General Public License
24 along with this program; if not, write to the Free Software
25 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
26 */
27
Mauro Carvalho Chehaba8733ca2006-03-17 10:37:02 -030028
Linus Torvalds1da177e2005-04-16 15:20:36 -070029#include <linux/module.h>
30#include <linux/ioctl.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090031#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070032#include <linux/i2c.h>
Hans Verkuil973909e2008-12-18 13:21:57 -030033#include <media/v4l2-device.h>
Hans Verkuil1b8dac12009-02-07 11:18:05 -030034#include <media/v4l2-chip-ident.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070035
Hans Verkuila8327812008-07-25 10:31:23 -030036MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
37MODULE_DESCRIPTION("tda9840 driver");
38MODULE_LICENSE("GPL");
Hans Verkuilf87086e2008-07-18 00:50:58 -030039
Hans Verkuila8327812008-07-25 10:31:23 -030040static int debug;
41module_param(debug, int, 0644);
42
43MODULE_PARM_DESC(debug, "Debug level (0-1)");
Linus Torvalds1da177e2005-04-16 15:20:36 -070044
45#define SWITCH 0x00
46#define LEVEL_ADJUST 0x02
47#define STEREO_ADJUST 0x03
48#define TEST 0x04
49
Hans Verkuil707ecf42008-09-06 15:40:25 -030050#define TDA9840_SET_MUTE 0x00
51#define TDA9840_SET_MONO 0x10
52#define TDA9840_SET_STEREO 0x2a
53#define TDA9840_SET_LANG1 0x12
54#define TDA9840_SET_LANG2 0x1e
55#define TDA9840_SET_BOTH 0x1a
56#define TDA9840_SET_BOTH_R 0x16
57#define TDA9840_SET_EXTERNAL 0x7a
58
Linus Torvalds1da177e2005-04-16 15:20:36 -070059
Hans Verkuil973909e2008-12-18 13:21:57 -030060static void tda9840_write(struct v4l2_subdev *sd, u8 reg, u8 val)
Hans Verkuila8327812008-07-25 10:31:23 -030061{
Hans Verkuil973909e2008-12-18 13:21:57 -030062 struct i2c_client *client = v4l2_get_subdevdata(sd);
63
Hans Verkuila8327812008-07-25 10:31:23 -030064 if (i2c_smbus_write_byte_data(client, reg, val))
Hans Verkuil973909e2008-12-18 13:21:57 -030065 v4l2_dbg(1, debug, sd, "error writing %02x to %02x\n",
Hans Verkuila8327812008-07-25 10:31:23 -030066 val, reg);
67}
Linus Torvalds1da177e2005-04-16 15:20:36 -070068
Hans Verkuil973909e2008-12-18 13:21:57 -030069static int tda9840_s_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *t)
Linus Torvalds1da177e2005-04-16 15:20:36 -070070{
Hans Verkuil973909e2008-12-18 13:21:57 -030071 int byte;
72
73 if (t->index)
74 return -EINVAL;
75
76 switch (t->audmode) {
77 case V4L2_TUNER_MODE_STEREO:
78 byte = TDA9840_SET_STEREO;
79 break;
80 case V4L2_TUNER_MODE_LANG1_LANG2:
81 byte = TDA9840_SET_BOTH;
82 break;
83 case V4L2_TUNER_MODE_LANG1:
84 byte = TDA9840_SET_LANG1;
85 break;
86 case V4L2_TUNER_MODE_LANG2:
87 byte = TDA9840_SET_LANG2;
88 break;
89 default:
90 byte = TDA9840_SET_MONO;
91 break;
92 }
93 v4l2_dbg(1, debug, sd, "TDA9840_SWITCH: 0x%02x\n", byte);
94 tda9840_write(sd, SWITCH, byte);
95 return 0;
96}
97
98static int tda9840_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *t)
99{
100 struct i2c_client *client = v4l2_get_subdevdata(sd);
101 u8 byte;
102
103 t->rxsubchans = V4L2_TUNER_SUB_MONO;
104 if (1 != i2c_master_recv(client, &byte, 1)) {
105 v4l2_dbg(1, debug, sd,
106 "i2c_master_recv() failed\n");
107 return -EIO;
108 }
109
110 if (byte & 0x80) {
111 v4l2_dbg(1, debug, sd,
112 "TDA9840_DETECT: register contents invalid\n");
113 return -EINVAL;
114 }
115
116 v4l2_dbg(1, debug, sd, "TDA9840_DETECT: byte: 0x%02x\n", byte);
117
118 switch (byte & 0x60) {
119 case 0x00:
120 t->rxsubchans = V4L2_TUNER_SUB_MONO;
121 break;
122 case 0x20:
123 t->rxsubchans = V4L2_TUNER_SUB_LANG1 | V4L2_TUNER_SUB_LANG2;
124 break;
125 case 0x40:
126 t->rxsubchans = V4L2_TUNER_SUB_STEREO | V4L2_TUNER_SUB_MONO;
127 break;
128 default: /* Incorrect detect */
129 t->rxsubchans = V4L2_TUNER_MODE_MONO;
130 break;
131 }
132 return 0;
133}
134
Hans Verkuil1b8dac12009-02-07 11:18:05 -0300135static int tda9840_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip)
Hans Verkuil973909e2008-12-18 13:21:57 -0300136{
Hans Verkuil1b8dac12009-02-07 11:18:05 -0300137 struct i2c_client *client = v4l2_get_subdevdata(sd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138
Hans Verkuil1b8dac12009-02-07 11:18:05 -0300139 return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_TDA9840, 0);
Hans Verkuil973909e2008-12-18 13:21:57 -0300140}
141
142/* ----------------------------------------------------------------------- */
143
144static const struct v4l2_subdev_core_ops tda9840_core_ops = {
Hans Verkuil1b8dac12009-02-07 11:18:05 -0300145 .g_chip_ident = tda9840_g_chip_ident,
Hans Verkuil973909e2008-12-18 13:21:57 -0300146};
147
148static const struct v4l2_subdev_tuner_ops tda9840_tuner_ops = {
149 .s_tuner = tda9840_s_tuner,
150 .g_tuner = tda9840_g_tuner,
151};
152
153static const struct v4l2_subdev_ops tda9840_ops = {
154 .core = &tda9840_core_ops,
155 .tuner = &tda9840_tuner_ops,
156};
157
158/* ----------------------------------------------------------------------- */
159
Hans Verkuila8327812008-07-25 10:31:23 -0300160static int tda9840_probe(struct i2c_client *client,
161 const struct i2c_device_id *id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162{
Hans Verkuil973909e2008-12-18 13:21:57 -0300163 struct v4l2_subdev *sd;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164
165 /* let's see whether this adapter can support what we need */
Hans Verkuila8327812008-07-25 10:31:23 -0300166 if (!i2c_check_functionality(client->adapter,
167 I2C_FUNC_SMBUS_READ_BYTE_DATA |
168 I2C_FUNC_SMBUS_WRITE_BYTE_DATA))
Hans Verkuil973909e2008-12-18 13:21:57 -0300169 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170
Hans Verkuila8327812008-07-25 10:31:23 -0300171 v4l_info(client, "chip found @ 0x%x (%s)\n",
172 client->addr << 1, client->adapter->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173
Hans Verkuil973909e2008-12-18 13:21:57 -0300174 sd = kmalloc(sizeof(struct v4l2_subdev), GFP_KERNEL);
175 if (sd == NULL)
176 return -ENOMEM;
177 v4l2_i2c_subdev_init(sd, client, &tda9840_ops);
178
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 /* set initial values for level & stereo - adjustment, mode */
Hans Verkuil1b8dac12009-02-07 11:18:05 -0300180 tda9840_write(sd, LEVEL_ADJUST, 0);
181 tda9840_write(sd, STEREO_ADJUST, 0);
Hans Verkuil973909e2008-12-18 13:21:57 -0300182 tda9840_write(sd, SWITCH, TDA9840_SET_STEREO);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183 return 0;
184}
185
Hans Verkuil973909e2008-12-18 13:21:57 -0300186static int tda9840_remove(struct i2c_client *client)
187{
188 struct v4l2_subdev *sd = i2c_get_clientdata(client);
189
190 v4l2_device_unregister_subdev(sd);
191 kfree(sd);
192 return 0;
193}
194
Hans Verkuila8327812008-07-25 10:31:23 -0300195static const struct i2c_device_id tda9840_id[] = {
196 { "tda9840", 0 },
197 { }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198};
Hans Verkuila8327812008-07-25 10:31:23 -0300199MODULE_DEVICE_TABLE(i2c, tda9840_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200
Hans Verkuilcb595b52010-09-15 15:06:40 -0300201static struct i2c_driver tda9840_driver = {
202 .driver = {
203 .owner = THIS_MODULE,
204 .name = "tda9840",
205 },
206 .probe = tda9840_probe,
207 .remove = tda9840_remove,
208 .id_table = tda9840_id,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209};
Hans Verkuilcb595b52010-09-15 15:06:40 -0300210
211static __init int init_tda9840(void)
212{
213 return i2c_add_driver(&tda9840_driver);
214}
215
216static __exit void exit_tda9840(void)
217{
218 i2c_del_driver(&tda9840_driver);
219}
220
221module_init(init_tda9840);
222module_exit(exit_tda9840);