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/slab.h>
20#include <linux/i2c.h>
21#include <linux/device.h>
22#include <linux/delay.h>
23#include <linux/module.h>
24#include <linux/uaccess.h>
25#include <linux/videodev2.h>
26
27#include <media/v4l2-device.h>
28#include <media/v4l2-subdev.h>
29#include <media/v4l2-chip-ident.h>
30
31MODULE_DESCRIPTION("TI THS7303 video amplifier driver");
32MODULE_AUTHOR("Chaithrika U S");
33MODULE_LICENSE("GPL");
34
35static int debug;
36module_param(debug, int, 0644);
37MODULE_PARM_DESC(debug, "Debug level 0-1");
38
39/* following function is used to set ths7303 */
40static int ths7303_setvalue(struct v4l2_subdev *sd, v4l2_std_id std)
41{
42	int err = 0;
43	u8 val;
44	struct i2c_client *client;
45
46	client = v4l2_get_subdevdata(sd);
47
48	if (std & (V4L2_STD_ALL & ~V4L2_STD_SECAM)) {
49		val = 0x02;
50		v4l2_dbg(1, debug, sd, "setting value for SDTV format\n");
51	} else {
52		val = 0x00;
53		v4l2_dbg(1, debug, sd, "disabling all channels\n");
54	}
55
56	err |= i2c_smbus_write_byte_data(client, 0x01, val);
57	err |= i2c_smbus_write_byte_data(client, 0x02, val);
58	err |= i2c_smbus_write_byte_data(client, 0x03, val);
59
60	if (err)
61		v4l2_err(sd, "write failed\n");
62
63	return err;
64}
65
66static int ths7303_s_std_output(struct v4l2_subdev *sd, v4l2_std_id norm)
67{
68	return ths7303_setvalue(sd, norm);
69}
70
71static int ths7303_g_chip_ident(struct v4l2_subdev *sd,
72				struct v4l2_dbg_chip_ident *chip)
73{
74	struct i2c_client *client = v4l2_get_subdevdata(sd);
75
76	return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_THS7303, 0);
77}
78
79static const struct v4l2_subdev_video_ops ths7303_video_ops = {
80	.s_std_output	= ths7303_s_std_output,
81};
82
83static const struct v4l2_subdev_core_ops ths7303_core_ops = {
84	.g_chip_ident = ths7303_g_chip_ident,
85};
86
87static const struct v4l2_subdev_ops ths7303_ops = {
88	.core	= &ths7303_core_ops,
89	.video 	= &ths7303_video_ops,
90};
91
92static int ths7303_probe(struct i2c_client *client,
93			const struct i2c_device_id *id)
94{
95	struct v4l2_subdev *sd;
96	v4l2_std_id std_id = V4L2_STD_NTSC;
97
98	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
99		return -ENODEV;
100
101	v4l_info(client, "chip found @ 0x%x (%s)\n",
102			client->addr << 1, client->adapter->name);
103
104	sd = kzalloc(sizeof(struct v4l2_subdev), GFP_KERNEL);
105	if (sd == NULL)
106		return -ENOMEM;
107
108	v4l2_i2c_subdev_init(sd, client, &ths7303_ops);
109
110	return ths7303_setvalue(sd, std_id);
111}
112
113static int ths7303_remove(struct i2c_client *client)
114{
115	struct v4l2_subdev *sd = i2c_get_clientdata(client);
116
117	v4l2_device_unregister_subdev(sd);
118	kfree(sd);
119
120	return 0;
121}
122
123static const struct i2c_device_id ths7303_id[] = {
124	{"ths7303", 0},
125	{},
126};
127
128MODULE_DEVICE_TABLE(i2c, ths7303_id);
129
130static struct i2c_driver ths7303_driver = {
131	.driver = {
132		.owner	= THIS_MODULE,
133		.name	= "ths7303",
134	},
135	.probe		= ths7303_probe,
136	.remove		= ths7303_remove,
137	.id_table	= ths7303_id,
138};
139
140static int __init ths7303_init(void)
141{
142	return i2c_add_driver(&ths7303_driver);
143}
144
145static void __exit ths7303_exit(void)
146{
147	i2c_del_driver(&ths7303_driver);
148}
149
150module_init(ths7303_init);
151module_exit(ths7303_exit);
152
153