diff options
author | Jonathan Herman <hermanjl@cs.unc.edu> | 2013-01-22 10:38:37 -0500 |
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committer | Jonathan Herman <hermanjl@cs.unc.edu> | 2013-01-22 10:38:37 -0500 |
commit | fcc9d2e5a6c89d22b8b773a64fb4ad21ac318446 (patch) | |
tree | a57612d1888735a2ec7972891b68c1ac5ec8faea /drivers/media/video/tda9840.c | |
parent | 8dea78da5cee153b8af9c07a2745f6c55057fe12 (diff) |
Diffstat (limited to 'drivers/media/video/tda9840.c')
-rw-r--r-- | drivers/media/video/tda9840.c | 222 |
1 files changed, 222 insertions, 0 deletions
diff --git a/drivers/media/video/tda9840.c b/drivers/media/video/tda9840.c new file mode 100644 index 00000000000..22fa8202d5c --- /dev/null +++ b/drivers/media/video/tda9840.c | |||
@@ -0,0 +1,222 @@ | |||
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); | ||