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31#include <linux/module.h>
32#include <linux/ioctl.h>
33#include <linux/i2c.h>
34#include <media/v4l2-device.h>
35#include <media/v4l2-chip-ident.h>
36#include <media/v4l2-i2c-drv.h>
37#include "tea6420.h"
38
39MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
40MODULE_DESCRIPTION("tea6420 driver");
41MODULE_LICENSE("GPL");
42
43static int debug;
44module_param(debug, int, 0644);
45
46MODULE_PARM_DESC(debug, "Debug level (0-1)");
47
48
49
50
51static int tea6420_s_routing(struct v4l2_subdev *sd,
52 u32 i, u32 o, u32 config)
53{
54 struct i2c_client *client = v4l2_get_subdevdata(sd);
55 int g = (o >> 4) & 0xf;
56 u8 byte;
57 int ret;
58
59 o &= 0xf;
60 v4l2_dbg(1, debug, sd, "i=%d, o=%d, g=%d\n", i, o, g);
61
62
63 if (i < 1 || i > 6 || o < 1 || o > 4 || g < 0 || g > 6 || g % 2 != 0)
64 return -EINVAL;
65
66 byte = ((o - 1) << 5);
67 byte |= (i - 1);
68
69
70 switch (g) {
71 case 0:
72 byte |= (3 << 3);
73 break;
74 case 2:
75 byte |= (2 << 3);
76 break;
77 case 4:
78 byte |= (1 << 3);
79 break;
80 case 6:
81 break;
82 }
83
84 ret = i2c_smbus_write_byte(client, byte);
85 if (ret) {
86 v4l2_dbg(1, debug, sd,
87 "i2c_smbus_write_byte() failed, ret:%d\n", ret);
88 return -EIO;
89 }
90 return 0;
91}
92
93static int tea6420_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip)
94{
95 struct i2c_client *client = v4l2_get_subdevdata(sd);
96
97 return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_TEA6420, 0);
98}
99
100
101
102static const struct v4l2_subdev_core_ops tea6420_core_ops = {
103 .g_chip_ident = tea6420_g_chip_ident,
104};
105
106static const struct v4l2_subdev_audio_ops tea6420_audio_ops = {
107 .s_routing = tea6420_s_routing,
108};
109
110static const struct v4l2_subdev_ops tea6420_ops = {
111 .core = &tea6420_core_ops,
112 .audio = &tea6420_audio_ops,
113};
114
115static int tea6420_probe(struct i2c_client *client,
116 const struct i2c_device_id *id)
117{
118 struct v4l2_subdev *sd;
119 int err, i;
120
121
122 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WRITE_BYTE))
123 return -EIO;
124
125 v4l_info(client, "chip found @ 0x%x (%s)\n",
126 client->addr << 1, client->adapter->name);
127
128 sd = kmalloc(sizeof(struct v4l2_subdev), GFP_KERNEL);
129 if (sd == NULL)
130 return -ENOMEM;
131 v4l2_i2c_subdev_init(sd, client, &tea6420_ops);
132
133
134 err = 0;
135 for (i = 1; i < 5; i++)
136 err += tea6420_s_routing(sd, 6, i, 0);
137 if (err) {
138 v4l_dbg(1, debug, client, "could not initialize tea6420\n");
139 return -ENODEV;
140 }
141 return 0;
142}
143
144static int tea6420_remove(struct i2c_client *client)
145{
146 struct v4l2_subdev *sd = i2c_get_clientdata(client);
147
148 v4l2_device_unregister_subdev(sd);
149 kfree(sd);
150 return 0;
151}
152
153static const struct i2c_device_id tea6420_id[] = {
154 { "tea6420", 0 },
155 { }
156};
157MODULE_DEVICE_TABLE(i2c, tea6420_id);
158
159static struct v4l2_i2c_driver_data v4l2_i2c_data = {
160 .name = "tea6420",
161 .probe = tea6420_probe,
162 .remove = tea6420_remove,
163 .id_table = tea6420_id,
164};
165