[media] marvell-cam: Basic working MMP camera driver
[linux-2.6.git] / drivers / media / video / tda9840.c
1  /*
2     tda9840 - i2c-driver for the tda9840 by SGS Thomson
3
4     Copyright (C) 1998-2003 Michael Hunold <michael@mihu.de>
5     Copyright (C) 2008 Hans Verkuil <hverkuil@xs4all.nl>
6
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
28
29 #include <linux/module.h>
30 #include <linux/ioctl.h>
31 #include <linux/slab.h>
32 #include <linux/i2c.h>
33 #include <media/v4l2-device.h>
34 #include <media/v4l2-chip-ident.h>
35
36 MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
37 MODULE_DESCRIPTION("tda9840 driver");
38 MODULE_LICENSE("GPL");
39
40 static int debug;
41 module_param(debug, int, 0644);
42
43 MODULE_PARM_DESC(debug, "Debug level (0-1)");
44
45 #define SWITCH          0x00
46 #define LEVEL_ADJUST    0x02
47 #define STEREO_ADJUST   0x03
48 #define TEST            0x04
49
50 #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
59
60 static void tda9840_write(struct v4l2_subdev *sd, u8 reg, u8 val)
61 {
62         struct i2c_client *client = v4l2_get_subdevdata(sd);
63
64         if (i2c_smbus_write_byte_data(client, reg, val))
65                 v4l2_dbg(1, debug, sd, "error writing %02x to %02x\n",
66                                 val, reg);
67 }
68
69 static int tda9840_s_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *t)
70 {
71         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
98 static 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
135 static int tda9840_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip)
136 {
137         struct i2c_client *client = v4l2_get_subdevdata(sd);
138
139         return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_TDA9840, 0);
140 }
141
142 /* ----------------------------------------------------------------------- */
143
144 static const struct v4l2_subdev_core_ops tda9840_core_ops = {
145         .g_chip_ident = tda9840_g_chip_ident,
146 };
147
148 static const struct v4l2_subdev_tuner_ops tda9840_tuner_ops = {
149         .s_tuner = tda9840_s_tuner,
150         .g_tuner = tda9840_g_tuner,
151 };
152
153 static const struct v4l2_subdev_ops tda9840_ops = {
154         .core = &tda9840_core_ops,
155         .tuner = &tda9840_tuner_ops,
156 };
157
158 /* ----------------------------------------------------------------------- */
159
160 static int tda9840_probe(struct i2c_client *client,
161                           const struct i2c_device_id *id)
162 {
163         struct v4l2_subdev *sd;
164
165         /* let's see whether this adapter can support what we need */
166         if (!i2c_check_functionality(client->adapter,
167                         I2C_FUNC_SMBUS_READ_BYTE_DATA |
168                         I2C_FUNC_SMBUS_WRITE_BYTE_DATA))
169                 return -EIO;
170
171         v4l_info(client, "chip found @ 0x%x (%s)\n",
172                         client->addr << 1, client->adapter->name);
173
174         sd = kzalloc(sizeof(struct v4l2_subdev), GFP_KERNEL);
175         if (sd == NULL)
176                 return -ENOMEM;
177         v4l2_i2c_subdev_init(sd, client, &tda9840_ops);
178
179         /* set initial values for level & stereo - adjustment, mode */
180         tda9840_write(sd, LEVEL_ADJUST, 0);
181         tda9840_write(sd, STEREO_ADJUST, 0);
182         tda9840_write(sd, SWITCH, TDA9840_SET_STEREO);
183         return 0;
184 }
185
186 static 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
195 static const struct i2c_device_id tda9840_id[] = {
196         { "tda9840", 0 },
197         { }
198 };
199 MODULE_DEVICE_TABLE(i2c, tda9840_id);
200
201 static 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,
209 };
210
211 static __init int init_tda9840(void)
212 {
213         return i2c_add_driver(&tda9840_driver);
214 }
215
216 static __exit void exit_tda9840(void)
217 {
218         i2c_del_driver(&tda9840_driver);
219 }
220
221 module_init(init_tda9840);
222 module_exit(exit_tda9840);