1 /*
2 * ths7303- THS7303 Video Amplifier driver
3 *
4 * Copyright (C) 2009 Texas Instruments Incorporated - http://www.ti.com/
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License as
8 * published by the Free Software Foundation version 2.
9 *
10 * This program is distributed .as is. WITHOUT ANY WARRANTY of any
11 * kind, whether express or implied; without even the implied warranty
12 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 */
15
16 #include <linux/kernel.h>
17 #include <linux/init.h>
18 #include <linux/ctype.h>
19 #include <linux/i2c.h>
20 #include <linux/device.h>
21 #include <linux/delay.h>
22 #include <linux/module.h>
23 #include <linux/uaccess.h>
24 #include <linux/videodev2.h>
25
26 #include <media/v4l2-device.h>
27 #include <media/v4l2-subdev.h>
28 #include <media/v4l2-chip-ident.h>
29
30 MODULE_DESCRIPTION("TI THS7303 video amplifier driver");
31 MODULE_AUTHOR("Chaithrika U S");
32 MODULE_LICENSE("GPL");
33
34 static int debug;
35 module_param(debug, int, 0644);
36 MODULE_PARM_DESC(debug, "Debug level 0-1");
37
38 /* following function is used to set ths7303 */
39 static int ths7303_setvalue(struct v4l2_subdev *sd, v4l2_std_id std)
40 {
41 int err = 0;
42 u8 val;
43 struct i2c_client *client;
44
45 client = v4l2_get_subdevdata(sd);
46
47 if (std & (V4L2_STD_ALL & ~V4L2_STD_SECAM)) {
48 val = 0x02;
49 v4l2_dbg(1, debug, sd, "setting value for SDTV format\n");
50 } else {
51 val = 0x00;
52 v4l2_dbg(1, debug, sd, "disabling all channels\n");
53 }
54
55 err |= i2c_smbus_write_byte_data(client, 0x01, val);
56 err |= i2c_smbus_write_byte_data(client, 0x02, val);
57 err |= i2c_smbus_write_byte_data(client, 0x03, val);
58
59 if (err)
60 v4l2_err(sd, "write failed\n");
61
62 return err;
63 }
64
65 static int ths7303_s_std_output(struct v4l2_subdev *sd, v4l2_std_id norm)
66 {
67 return ths7303_setvalue(sd, norm);
68 }
69
70 static int ths7303_g_chip_ident(struct v4l2_subdev *sd,
71 struct v4l2_dbg_chip_ident *chip)
72 {
73 struct i2c_client *client = v4l2_get_subdevdata(sd);
74
75 return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_THS7303, 0);
76 }
77
78 static const struct v4l2_subdev_video_ops ths7303_video_ops = {
79 .s_std_output = ths7303_s_std_output,
80 };
81
82 static const struct v4l2_subdev_core_ops ths7303_core_ops = {
83 .g_chip_ident = ths7303_g_chip_ident,
84 };
85
86 static const struct v4l2_subdev_ops ths7303_ops = {
87 .core = &ths7303_core_ops,
88 .video = &ths7303_video_ops,
89 };
90
91 static int ths7303_probe(struct i2c_client *client,
92 const struct i2c_device_id *id)
93 {
94 struct v4l2_subdev *sd;
95 v4l2_std_id std_id = V4L2_STD_NTSC;
96
97 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
98 return -ENODEV;
99
100 v4l_info(client, "chip found @ 0x%x (%s)\n",
101 client->addr << 1, client->adapter->name);
102
103 sd = kzalloc(sizeof(struct v4l2_subdev), GFP_KERNEL);
104 if (sd == NULL)
105 return -ENOMEM;
106
107 v4l2_i2c_subdev_init(sd, client, &ths7303_ops);
108
109 return ths7303_setvalue(sd, std_id);
110 }
111
112 static int ths7303_remove(struct i2c_client *client)
113 {
114 struct v4l2_subdev *sd = i2c_get_clientdata(client);
115
116 v4l2_device_unregister_subdev(sd);
117 kfree(sd);
118
119 return 0;
120 }
121
122 static const struct i2c_device_id ths7303_id[] = {
123 {"ths7303", 0},
124 {},
125 };
126
127 MODULE_DEVICE_TABLE(i2c, ths7303_id);
128
129 static struct i2c_driver ths7303_driver = {
130 .driver = {
131 .owner = THIS_MODULE,
132 .name = "ths7303",
133 },
134 .probe = ths7303_probe,
135 .remove = ths7303_remove,
136 .id_table = ths7303_id,
137 };
138
139 static int __init ths7303_init(void)
140 {
141 return i2c_add_driver(&ths7303_driver);
142 }
143
144 static void __exit ths7303_exit(void)
145 {
146 i2c_del_driver(&ths7303_driver);
147 }
148
149 module_init(ths7303_init);
150 module_exit(ths7303_exit);
151
152
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