Commit | Line | Data |
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74ba9207 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | tda9840 - i2c-driver for the tda9840 by SGS Thomson | |
4 | ||
5 | Copyright (C) 1998-2003 Michael Hunold <michael@mihu.de> | |
a832781c | 6 | Copyright (C) 2008 Hans Verkuil <hverkuil@xs4all.nl> |
1da177e4 LT |
7 | |
8 | The tda9840 is a stereo/dual sound processor with digital | |
9 | identification. It can be found at address 0x84 on the i2c-bus. | |
10 | ||
f8a7647d | 11 | For detailed information download the specifications directly |
1da177e4 LT |
12 | from SGS Thomson at http://www.st.com |
13 | ||
1da177e4 LT |
14 | */ |
15 | ||
a8733ca5 | 16 | |
1da177e4 LT |
17 | #include <linux/module.h> |
18 | #include <linux/ioctl.h> | |
5a0e3ad6 | 19 | #include <linux/slab.h> |
1da177e4 | 20 | #include <linux/i2c.h> |
973909e8 | 21 | #include <media/v4l2-device.h> |
1da177e4 | 22 | |
a832781c HV |
23 | MODULE_AUTHOR("Michael Hunold <michael@mihu.de>"); |
24 | MODULE_DESCRIPTION("tda9840 driver"); | |
25 | MODULE_LICENSE("GPL"); | |
26 | ||
27 | static int debug; | |
1da177e4 | 28 | module_param(debug, int, 0644); |
f87086e3 | 29 | |
a832781c | 30 | MODULE_PARM_DESC(debug, "Debug level (0-1)"); |
1da177e4 LT |
31 | |
32 | #define SWITCH 0x00 | |
33 | #define LEVEL_ADJUST 0x02 | |
34 | #define STEREO_ADJUST 0x03 | |
35 | #define TEST 0x04 | |
36 | ||
707ecf46 HV |
37 | #define TDA9840_SET_MUTE 0x00 |
38 | #define TDA9840_SET_MONO 0x10 | |
39 | #define TDA9840_SET_STEREO 0x2a | |
40 | #define TDA9840_SET_LANG1 0x12 | |
41 | #define TDA9840_SET_LANG2 0x1e | |
42 | #define TDA9840_SET_BOTH 0x1a | |
43 | #define TDA9840_SET_BOTH_R 0x16 | |
44 | #define TDA9840_SET_EXTERNAL 0x7a | |
45 | ||
1da177e4 | 46 | |
973909e8 | 47 | static void tda9840_write(struct v4l2_subdev *sd, u8 reg, u8 val) |
a832781c | 48 | { |
973909e8 HV |
49 | struct i2c_client *client = v4l2_get_subdevdata(sd); |
50 | ||
a832781c | 51 | if (i2c_smbus_write_byte_data(client, reg, val)) |
973909e8 | 52 | v4l2_dbg(1, debug, sd, "error writing %02x to %02x\n", |
a832781c HV |
53 | val, reg); |
54 | } | |
1da177e4 | 55 | |
8bb5bafa HV |
56 | static int tda9840_status(struct v4l2_subdev *sd) |
57 | { | |
58 | struct i2c_client *client = v4l2_get_subdevdata(sd); | |
afdb4ca2 | 59 | int rc; |
8bb5bafa HV |
60 | u8 byte; |
61 | ||
afdb4ca2 MCC |
62 | rc = i2c_master_recv(client, &byte, 1); |
63 | if (rc != 1) { | |
8bb5bafa HV |
64 | v4l2_dbg(1, debug, sd, |
65 | "i2c_master_recv() failed\n"); | |
afdb4ca2 MCC |
66 | if (rc < 0) |
67 | return rc; | |
8bb5bafa HV |
68 | return -EIO; |
69 | } | |
70 | ||
71 | if (byte & 0x80) { | |
72 | v4l2_dbg(1, debug, sd, | |
73 | "TDA9840_DETECT: register contents invalid\n"); | |
74 | return -EINVAL; | |
75 | } | |
76 | ||
77 | v4l2_dbg(1, debug, sd, "TDA9840_DETECT: byte: 0x%02x\n", byte); | |
78 | return byte & 0x60; | |
79 | } | |
80 | ||
2f73c7c5 | 81 | static int tda9840_s_tuner(struct v4l2_subdev *sd, const struct v4l2_tuner *t) |
1da177e4 | 82 | { |
8bb5bafa | 83 | int stat = tda9840_status(sd); |
973909e8 | 84 | int byte; |
707ecf46 | 85 | |
973909e8 HV |
86 | if (t->index) |
87 | return -EINVAL; | |
707ecf46 | 88 | |
8bb5bafa HV |
89 | stat = stat < 0 ? 0 : stat; |
90 | if (stat == 0 || stat == 0x60) /* mono input */ | |
973909e8 | 91 | byte = TDA9840_SET_MONO; |
8bb5bafa HV |
92 | else if (stat == 0x40) /* stereo input */ |
93 | byte = (t->audmode == V4L2_TUNER_MODE_MONO) ? | |
94 | TDA9840_SET_MONO : TDA9840_SET_STEREO; | |
95 | else { /* bilingual */ | |
96 | switch (t->audmode) { | |
97 | case V4L2_TUNER_MODE_LANG1_LANG2: | |
98 | byte = TDA9840_SET_BOTH; | |
99 | break; | |
100 | case V4L2_TUNER_MODE_LANG2: | |
101 | byte = TDA9840_SET_LANG2; | |
102 | break; | |
103 | default: | |
104 | byte = TDA9840_SET_LANG1; | |
105 | break; | |
106 | } | |
973909e8 HV |
107 | } |
108 | v4l2_dbg(1, debug, sd, "TDA9840_SWITCH: 0x%02x\n", byte); | |
109 | tda9840_write(sd, SWITCH, byte); | |
110 | return 0; | |
111 | } | |
112 | ||
113 | static int tda9840_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *t) | |
114 | { | |
8bb5bafa | 115 | int stat = tda9840_status(sd); |
973909e8 | 116 | |
8bb5bafa HV |
117 | if (stat < 0) |
118 | return stat; | |
707ecf46 | 119 | |
8bb5bafa | 120 | t->rxsubchans = V4L2_TUNER_SUB_MONO; |
1da177e4 | 121 | |
8bb5bafa | 122 | switch (stat & 0x60) { |
973909e8 | 123 | case 0x00: |
707ecf46 | 124 | t->rxsubchans = V4L2_TUNER_SUB_MONO; |
973909e8 HV |
125 | break; |
126 | case 0x20: | |
127 | t->rxsubchans = V4L2_TUNER_SUB_LANG1 | V4L2_TUNER_SUB_LANG2; | |
128 | break; | |
129 | case 0x40: | |
130 | t->rxsubchans = V4L2_TUNER_SUB_STEREO | V4L2_TUNER_SUB_MONO; | |
131 | break; | |
132 | default: /* Incorrect detect */ | |
133 | t->rxsubchans = V4L2_TUNER_MODE_MONO; | |
1da177e4 | 134 | break; |
707ecf46 | 135 | } |
973909e8 HV |
136 | return 0; |
137 | } | |
1da177e4 | 138 | |
973909e8 HV |
139 | /* ----------------------------------------------------------------------- */ |
140 | ||
973909e8 HV |
141 | static const struct v4l2_subdev_tuner_ops tda9840_tuner_ops = { |
142 | .s_tuner = tda9840_s_tuner, | |
143 | .g_tuner = tda9840_g_tuner, | |
144 | }; | |
145 | ||
146 | static const struct v4l2_subdev_ops tda9840_ops = { | |
973909e8 HV |
147 | .tuner = &tda9840_tuner_ops, |
148 | }; | |
149 | ||
150 | /* ----------------------------------------------------------------------- */ | |
151 | ||
a832781c HV |
152 | static int tda9840_probe(struct i2c_client *client, |
153 | const struct i2c_device_id *id) | |
1da177e4 | 154 | { |
973909e8 | 155 | struct v4l2_subdev *sd; |
1da177e4 LT |
156 | |
157 | /* let's see whether this adapter can support what we need */ | |
a832781c HV |
158 | if (!i2c_check_functionality(client->adapter, |
159 | I2C_FUNC_SMBUS_READ_BYTE_DATA | | |
160 | I2C_FUNC_SMBUS_WRITE_BYTE_DATA)) | |
973909e8 | 161 | return -EIO; |
1da177e4 | 162 | |
a832781c HV |
163 | v4l_info(client, "chip found @ 0x%x (%s)\n", |
164 | client->addr << 1, client->adapter->name); | |
1da177e4 | 165 | |
c02b211d | 166 | sd = devm_kzalloc(&client->dev, sizeof(*sd), GFP_KERNEL); |
973909e8 HV |
167 | if (sd == NULL) |
168 | return -ENOMEM; | |
169 | v4l2_i2c_subdev_init(sd, client, &tda9840_ops); | |
170 | ||
1da177e4 | 171 | /* set initial values for level & stereo - adjustment, mode */ |
1b8dac15 HV |
172 | tda9840_write(sd, LEVEL_ADJUST, 0); |
173 | tda9840_write(sd, STEREO_ADJUST, 0); | |
973909e8 | 174 | tda9840_write(sd, SWITCH, TDA9840_SET_STEREO); |
1da177e4 LT |
175 | return 0; |
176 | } | |
177 | ||
973909e8 HV |
178 | static int tda9840_remove(struct i2c_client *client) |
179 | { | |
180 | struct v4l2_subdev *sd = i2c_get_clientdata(client); | |
181 | ||
182 | v4l2_device_unregister_subdev(sd); | |
973909e8 HV |
183 | return 0; |
184 | } | |
185 | ||
a832781c HV |
186 | static const struct i2c_device_id tda9840_id[] = { |
187 | { "tda9840", 0 }, | |
188 | { } | |
1da177e4 | 189 | }; |
a832781c | 190 | MODULE_DEVICE_TABLE(i2c, tda9840_id); |
1da177e4 | 191 | |
cb595b51 HV |
192 | static struct i2c_driver tda9840_driver = { |
193 | .driver = { | |
cb595b51 HV |
194 | .name = "tda9840", |
195 | }, | |
196 | .probe = tda9840_probe, | |
197 | .remove = tda9840_remove, | |
198 | .id_table = tda9840_id, | |
1da177e4 | 199 | }; |
cb595b51 | 200 | |
c6e8d86f | 201 | module_i2c_driver(tda9840_driver); |