summaryrefslogtreecommitdiffstats
path: root/drivers/media/i2c/ths7303.c
blob: e747524ba6edcdb2b4565f026ced238d7945997a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
/*
 * ths7303- THS7303 Video Amplifier driver
 *
 * Copyright (C) 2009 Texas Instruments Incorporated - http://www.ti.com/
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation version 2.
 *
 * This program is distributed .as is. WITHOUT ANY WARRANTY of any
 * kind, whether express or implied; without even the implied warranty
 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/ctype.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/device.h>
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/uaccess.h>
#include <linux/videodev2.h>

#include <media/v4l2-device.h>
#include <media/v4l2-subdev.h>
#include <media/v4l2-chip-ident.h>

#define THS7303_CHANNEL_1	1
#define THS7303_CHANNEL_2	2
#define THS7303_CHANNEL_3	3

enum ths7303_filter_mode {
	THS7303_FILTER_MODE_480I_576I,
	THS7303_FILTER_MODE_480P_576P,
	THS7303_FILTER_MODE_720P_1080I,
	THS7303_FILTER_MODE_1080P,
	THS7303_FILTER_MODE_DISABLE
};

MODULE_DESCRIPTION("TI THS7303 video amplifier driver");
MODULE_AUTHOR("Chaithrika U S");
MODULE_LICENSE("GPL");

static int debug;
module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "Debug level 0-1");

/* following function is used to set ths7303 */
int ths7303_setval(struct v4l2_subdev *sd, enum ths7303_filter_mode mode)
{
	u8 input_bias_chroma = 3;
	u8 input_bias_luma = 3;
	int disable = 0;
	int err = 0;
	u8 val = 0;
	u8 temp;

	struct i2c_client *client = v4l2_get_subdevdata(sd);

	if (!client)
		return -EINVAL;

	switch (mode) {
	case THS7303_FILTER_MODE_1080P:
		val = (3 << 6);
		val |= (3 << 3);
		break;
	case THS7303_FILTER_MODE_720P_1080I:
		val = (2 << 6);
		val |= (2 << 3);
		break;
	case THS7303_FILTER_MODE_480P_576P:
		val = (1 << 6);
		val |= (1 << 3);
		break;
	case THS7303_FILTER_MODE_480I_576I:
		break;
	case THS7303_FILTER_MODE_DISABLE:
		pr_info("mode disabled\n");
		/* disable all channels */
		disable = 1;
	default:
		/* disable all channels */
		disable = 1;
	}
	/* Setup channel 2 - Luma - Green */
	temp = val;
	if (!disable)
		val |= input_bias_luma;
	err = i2c_smbus_write_byte_data(client, THS7303_CHANNEL_2, val);
	if (err)
		goto out;

	/* setup two chroma channels */
	if (!disable)
		temp |= input_bias_chroma;

	err = i2c_smbus_write_byte_data(client, THS7303_CHANNEL_1, temp);
	if (err)
		goto out;

	err = i2c_smbus_write_byte_data(client, THS7303_CHANNEL_3, temp);
	if (err)
		goto out;
	return err;
out:
	pr_info("write byte data failed\n");
	return err;
}

static int ths7303_s_std_output(struct v4l2_subdev *sd, v4l2_std_id norm)
{
	if (norm & (V4L2_STD_ALL & ~V4L2_STD_SECAM))
		return ths7303_setval(sd, THS7303_FILTER_MODE_480I_576I);
	else
		return ths7303_setval(sd, THS7303_FILTER_MODE_DISABLE);
}

/* for setting filter for HD output */
static int ths7303_s_dv_timings(struct v4l2_subdev *sd,
			       struct v4l2_dv_timings *dv_timings)
{
	u32 height = dv_timings->bt.height;
	int interlaced = dv_timings->bt.interlaced;
	int res = 0;

	if (height == 1080 && !interlaced)
		res = ths7303_setval(sd, THS7303_FILTER_MODE_1080P);
	else if ((height == 720 && !interlaced) ||
			(height == 1080 && interlaced))
		res = ths7303_setval(sd, THS7303_FILTER_MODE_720P_1080I);
	else if ((height == 480 || height == 576) && !interlaced)
		res = ths7303_setval(sd, THS7303_FILTER_MODE_480P_576P);
	else
		/* disable all channels */
		res = ths7303_setval(sd, THS7303_FILTER_MODE_DISABLE);

	return res;
}

static int ths7303_g_chip_ident(struct v4l2_subdev *sd,
				struct v4l2_dbg_chip_ident *chip)
{
	struct i2c_client *client = v4l2_get_subdevdata(sd);

	return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_THS7303, 0);
}

static const struct v4l2_subdev_video_ops ths7303_video_ops = {
	.s_std_output	= ths7303_s_std_output,
	.s_dv_timings    = ths7303_s_dv_timings,
};

static const struct v4l2_subdev_core_ops ths7303_core_ops = {
	.g_chip_ident = ths7303_g_chip_ident,
};

static const struct v4l2_subdev_ops ths7303_ops = {
	.core	= &ths7303_core_ops,
	.video 	= &ths7303_video_ops,
};

static int ths7303_probe(struct i2c_client *client,
			const struct i2c_device_id *id)
{
	struct v4l2_subdev *sd;
	v4l2_std_id std_id = V4L2_STD_NTSC;

	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
		return -ENODEV;

	v4l_info(client, "chip found @ 0x%x (%s)\n",
			client->addr << 1, client->adapter->name);

	sd = devm_kzalloc(&client->dev, sizeof(struct v4l2_subdev), GFP_KERNEL);
	if (sd == NULL)
		return -ENOMEM;

	v4l2_i2c_subdev_init(sd, client, &ths7303_ops);

	return ths7303_s_std_output(sd, std_id);
}

static int ths7303_remove(struct i2c_client *client)
{
	struct v4l2_subdev *sd = i2c_get_clientdata(client);

	v4l2_device_unregister_subdev(sd);

	return 0;
}

static const struct i2c_device_id ths7303_id[] = {
	{"ths7303", 0},
	{},
};

MODULE_DEVICE_TABLE(i2c, ths7303_id);

static struct i2c_driver ths7303_driver = {
	.driver = {
		.owner	= THIS_MODULE,
		.name	= "ths7303",
	},
	.probe		= ths7303_probe,
	.remove		= ths7303_remove,
	.id_table	= ths7303_id,
};

module_i2c_driver(ths7303_driver);