1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | tda9840 - i2c-driver for the tda9840 by SGS Thomson |
4 | |
5 | Copyright (C) 1998-2003 Michael Hunold <michael@mihu.de> |
6 | Copyright (C) 2008 Hans Verkuil <hverkuil@xs4all.nl> |
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 | |
11 | For detailed information download the specifications directly |
12 | from SGS Thomson at http://www.st.com |
13 | |
14 | */ |
15 | |
16 | |
17 | #include <linux/module.h> |
18 | #include <linux/ioctl.h> |
19 | #include <linux/slab.h> |
20 | #include <linux/i2c.h> |
21 | #include <media/v4l2-device.h> |
22 | |
23 | MODULE_AUTHOR("Michael Hunold <michael@mihu.de>" ); |
24 | MODULE_DESCRIPTION("tda9840 driver" ); |
25 | MODULE_LICENSE("GPL" ); |
26 | |
27 | static int debug; |
28 | module_param(debug, int, 0644); |
29 | |
30 | MODULE_PARM_DESC(debug, "Debug level (0-1)" ); |
31 | |
32 | #define SWITCH 0x00 |
33 | #define LEVEL_ADJUST 0x02 |
34 | #define STEREO_ADJUST 0x03 |
35 | #define TEST 0x04 |
36 | |
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 | |
46 | |
47 | static void tda9840_write(struct v4l2_subdev *sd, u8 reg, u8 val) |
48 | { |
49 | struct i2c_client *client = v4l2_get_subdevdata(sd); |
50 | |
51 | if (i2c_smbus_write_byte_data(client, command: reg, value: val)) |
52 | v4l2_dbg(1, debug, sd, "error writing %02x to %02x\n" , |
53 | val, reg); |
54 | } |
55 | |
56 | static int tda9840_status(struct v4l2_subdev *sd) |
57 | { |
58 | struct i2c_client *client = v4l2_get_subdevdata(sd); |
59 | int rc; |
60 | u8 byte; |
61 | |
62 | rc = i2c_master_recv(client, buf: &byte, count: 1); |
63 | if (rc != 1) { |
64 | v4l2_dbg(1, debug, sd, |
65 | "i2c_master_recv() failed\n" ); |
66 | if (rc < 0) |
67 | return rc; |
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 | |
81 | static int tda9840_s_tuner(struct v4l2_subdev *sd, const struct v4l2_tuner *t) |
82 | { |
83 | int stat = tda9840_status(sd); |
84 | int byte; |
85 | |
86 | if (t->index) |
87 | return -EINVAL; |
88 | |
89 | stat = stat < 0 ? 0 : stat; |
90 | if (stat == 0 || stat == 0x60) /* mono input */ |
91 | byte = TDA9840_SET_MONO; |
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 | } |
107 | } |
108 | v4l2_dbg(1, debug, sd, "TDA9840_SWITCH: 0x%02x\n" , byte); |
109 | tda9840_write(sd, SWITCH, val: byte); |
110 | return 0; |
111 | } |
112 | |
113 | static int tda9840_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *t) |
114 | { |
115 | int stat = tda9840_status(sd); |
116 | |
117 | if (stat < 0) |
118 | return stat; |
119 | |
120 | t->rxsubchans = V4L2_TUNER_SUB_MONO; |
121 | |
122 | switch (stat & 0x60) { |
123 | case 0x00: |
124 | t->rxsubchans = V4L2_TUNER_SUB_MONO; |
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; |
134 | break; |
135 | } |
136 | return 0; |
137 | } |
138 | |
139 | /* ----------------------------------------------------------------------- */ |
140 | |
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 = { |
147 | .tuner = &tda9840_tuner_ops, |
148 | }; |
149 | |
150 | /* ----------------------------------------------------------------------- */ |
151 | |
152 | static int tda9840_probe(struct i2c_client *client) |
153 | { |
154 | struct v4l2_subdev *sd; |
155 | |
156 | /* let's see whether this adapter can support what we need */ |
157 | if (!i2c_check_functionality(adap: client->adapter, |
158 | I2C_FUNC_SMBUS_READ_BYTE_DATA | |
159 | I2C_FUNC_SMBUS_WRITE_BYTE_DATA)) |
160 | return -EIO; |
161 | |
162 | v4l_info(client, "chip found @ 0x%x (%s)\n" , |
163 | client->addr << 1, client->adapter->name); |
164 | |
165 | sd = devm_kzalloc(dev: &client->dev, size: sizeof(*sd), GFP_KERNEL); |
166 | if (sd == NULL) |
167 | return -ENOMEM; |
168 | v4l2_i2c_subdev_init(sd, client, ops: &tda9840_ops); |
169 | |
170 | /* set initial values for level & stereo - adjustment, mode */ |
171 | tda9840_write(sd, LEVEL_ADJUST, val: 0); |
172 | tda9840_write(sd, STEREO_ADJUST, val: 0); |
173 | tda9840_write(sd, SWITCH, TDA9840_SET_STEREO); |
174 | return 0; |
175 | } |
176 | |
177 | static void tda9840_remove(struct i2c_client *client) |
178 | { |
179 | struct v4l2_subdev *sd = i2c_get_clientdata(client); |
180 | |
181 | v4l2_device_unregister_subdev(sd); |
182 | } |
183 | |
184 | static const struct i2c_device_id tda9840_id[] = { |
185 | { "tda9840" , 0 }, |
186 | { } |
187 | }; |
188 | MODULE_DEVICE_TABLE(i2c, tda9840_id); |
189 | |
190 | static struct i2c_driver tda9840_driver = { |
191 | .driver = { |
192 | .name = "tda9840" , |
193 | }, |
194 | .probe = tda9840_probe, |
195 | .remove = tda9840_remove, |
196 | .id_table = tda9840_id, |
197 | }; |
198 | |
199 | module_i2c_driver(tda9840_driver); |
200 | |