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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
35MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
36MODULE_DESCRIPTION("tda9840 driver");
37MODULE_LICENSE("GPL");
38
39static int debug;
40module_param(debug, int, 0644);
41
42MODULE_PARM_DESC(debug, "Debug level (0-1)");
43
44#define SWITCH 0x00
45#define LEVEL_ADJUST 0x02
46#define STEREO_ADJUST 0x03
47#define TEST 0x04
48
49#define TDA9840_SET_MUTE 0x00
50#define TDA9840_SET_MONO 0x10
51#define TDA9840_SET_STEREO 0x2a
52#define TDA9840_SET_LANG1 0x12
53#define TDA9840_SET_LANG2 0x1e
54#define TDA9840_SET_BOTH 0x1a
55#define TDA9840_SET_BOTH_R 0x16
56#define TDA9840_SET_EXTERNAL 0x7a
57
58
59static void tda9840_write(struct v4l2_subdev *sd, u8 reg, u8 val)
60{
61 struct i2c_client *client = v4l2_get_subdevdata(sd);
62
63 if (i2c_smbus_write_byte_data(client, reg, val))
64 v4l2_dbg(1, debug, sd, "error writing %02x to %02x\n",
65 val, reg);
66}
67
68static int tda9840_status(struct v4l2_subdev *sd)
69{
70 struct i2c_client *client = v4l2_get_subdevdata(sd);
71 u8 byte;
72
73 if (1 != i2c_master_recv(client, &byte, 1)) {
74 v4l2_dbg(1, debug, sd,
75 "i2c_master_recv() failed\n");
76 return -EIO;
77 }
78
79 if (byte & 0x80) {
80 v4l2_dbg(1, debug, sd,
81 "TDA9840_DETECT: register contents invalid\n");
82 return -EINVAL;
83 }
84
85 v4l2_dbg(1, debug, sd, "TDA9840_DETECT: byte: 0x%02x\n", byte);
86 return byte & 0x60;
87}
88
89static int tda9840_s_tuner(struct v4l2_subdev *sd, const struct v4l2_tuner *t)
90{
91 int stat = tda9840_status(sd);
92 int byte;
93
94 if (t->index)
95 return -EINVAL;
96
97 stat = stat < 0 ? 0 : stat;
98 if (stat == 0 || stat == 0x60)
99 byte = TDA9840_SET_MONO;
100 else if (stat == 0x40)
101 byte = (t->audmode == V4L2_TUNER_MODE_MONO) ?
102 TDA9840_SET_MONO : TDA9840_SET_STEREO;
103 else {
104 switch (t->audmode) {
105 case V4L2_TUNER_MODE_LANG1_LANG2:
106 byte = TDA9840_SET_BOTH;
107 break;
108 case V4L2_TUNER_MODE_LANG2:
109 byte = TDA9840_SET_LANG2;
110 break;
111 default:
112 byte = TDA9840_SET_LANG1;
113 break;
114 }
115 }
116 v4l2_dbg(1, debug, sd, "TDA9840_SWITCH: 0x%02x\n", byte);
117 tda9840_write(sd, SWITCH, byte);
118 return 0;
119}
120
121static int tda9840_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *t)
122{
123 int stat = tda9840_status(sd);
124
125 if (stat < 0)
126 return stat;
127
128 t->rxsubchans = V4L2_TUNER_SUB_MONO;
129
130 switch (stat & 0x60) {
131 case 0x00:
132 t->rxsubchans = V4L2_TUNER_SUB_MONO;
133 break;
134 case 0x20:
135 t->rxsubchans = V4L2_TUNER_SUB_LANG1 | V4L2_TUNER_SUB_LANG2;
136 break;
137 case 0x40:
138 t->rxsubchans = V4L2_TUNER_SUB_STEREO | V4L2_TUNER_SUB_MONO;
139 break;
140 default:
141 t->rxsubchans = V4L2_TUNER_MODE_MONO;
142 break;
143 }
144 return 0;
145}
146
147
148
149static const struct v4l2_subdev_tuner_ops tda9840_tuner_ops = {
150 .s_tuner = tda9840_s_tuner,
151 .g_tuner = tda9840_g_tuner,
152};
153
154static const struct v4l2_subdev_ops tda9840_ops = {
155 .tuner = &tda9840_tuner_ops,
156};
157
158
159
160static int tda9840_probe(struct i2c_client *client,
161 const struct i2c_device_id *id)
162{
163 struct v4l2_subdev *sd;
164
165
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 = devm_kzalloc(&client->dev, sizeof(*sd), GFP_KERNEL);
175 if (sd == NULL)
176 return -ENOMEM;
177 v4l2_i2c_subdev_init(sd, client, &tda9840_ops);
178
179
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
186static 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 return 0;
192}
193
194static const struct i2c_device_id tda9840_id[] = {
195 { "tda9840", 0 },
196 { }
197};
198MODULE_DEVICE_TABLE(i2c, tda9840_id);
199
200static struct i2c_driver tda9840_driver = {
201 .driver = {
202 .owner = THIS_MODULE,
203 .name = "tda9840",
204 },
205 .probe = tda9840_probe,
206 .remove = tda9840_remove,
207 .id_table = tda9840_id,
208};
209
210module_i2c_driver(tda9840_driver);
211