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
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
|
/*
* Copyright (C) 2005-2006 Micronas USA Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License (Version 2) as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/i2c.h>
#include <linux/videodev2.h>
#include <linux/ioctl.h>
#include <linux/slab.h>
#include <media/v4l2-device.h>
#include <media/v4l2-ctrls.h>
MODULE_DESCRIPTION("TW9906 I2C subdev driver");
MODULE_LICENSE("GPL v2");
struct tw9906 {
struct v4l2_subdev sd;
struct v4l2_ctrl_handler hdl;
v4l2_std_id norm;
};
static inline struct tw9906 *to_state(struct v4l2_subdev *sd)
{
return container_of(sd, struct tw9906, sd);
}
static const u8 initial_registers[] = {
0x02, 0x40, /* input 0, composite */
0x03, 0xa2, /* correct digital format */
0x05, 0x81, /* or 0x01 for PAL */
0x07, 0x02, /* window */
0x08, 0x14, /* window */
0x09, 0xf0, /* window */
0x0a, 0x10, /* window */
0x0b, 0xd0, /* window */
0x0d, 0x00, /* scaling */
0x0e, 0x11, /* scaling */
0x0f, 0x00, /* scaling */
0x10, 0x00, /* brightness */
0x11, 0x60, /* contrast */
0x12, 0x11, /* sharpness */
0x13, 0x7e, /* U gain */
0x14, 0x7e, /* V gain */
0x15, 0x00, /* hue */
0x19, 0x57, /* vbi */
0x1a, 0x0f,
0x1b, 0x40,
0x29, 0x03,
0x55, 0x00,
0x6b, 0x26,
0x6c, 0x36,
0x6d, 0xf0,
0x6e, 0x41,
0x6f, 0x13,
0xad, 0x70,
0x00, 0x00, /* Terminator (reg 0x00 is read-only) */
};
static int write_reg(struct v4l2_subdev *sd, u8 reg, u8 value)
{
struct i2c_client *client = v4l2_get_subdevdata(sd);
return i2c_smbus_write_byte_data(client, reg, value);
}
static int write_regs(struct v4l2_subdev *sd, const u8 *regs)
{
int i;
for (i = 0; regs[i] != 0x00; i += 2)
if (write_reg(sd, regs[i], regs[i + 1]) < 0)
return -1;
return 0;
}
static int tw9906_s_video_routing(struct v4l2_subdev *sd, u32 input,
u32 output, u32 config)
{
write_reg(sd, 0x02, 0x40 | (input << 1));
return 0;
}
static int tw9906_s_std(struct v4l2_subdev *sd, v4l2_std_id norm)
{
struct tw9906 *dec = to_state(sd);
bool is_60hz = norm & V4L2_STD_525_60;
static const u8 config_60hz[] = {
0x05, 0x81,
0x07, 0x02,
0x08, 0x14,
0x09, 0xf0,
0, 0,
};
static const u8 config_50hz[] = {
0x05, 0x01,
0x07, 0x12,
0x08, 0x18,
0x09, 0x20,
0, 0,
};
write_regs(sd, is_60hz ? config_60hz : config_50hz);
dec->norm = norm;
return 0;
}
static int tw9906_s_ctrl(struct v4l2_ctrl *ctrl)
{
struct tw9906 *dec = container_of(ctrl->handler, struct tw9906, hdl);
struct v4l2_subdev *sd = &dec->sd;
switch (ctrl->id) {
case V4L2_CID_BRIGHTNESS:
write_reg(sd, 0x10, ctrl->val);
break;
case V4L2_CID_CONTRAST:
write_reg(sd, 0x11, ctrl->val);
break;
case V4L2_CID_HUE:
write_reg(sd, 0x15, ctrl->val);
break;
default:
return -EINVAL;
}
return 0;
}
static int tw9906_log_status(struct v4l2_subdev *sd)
{
struct tw9906 *dec = to_state(sd);
bool is_60hz = dec->norm & V4L2_STD_525_60;
v4l2_info(sd, "Standard: %d Hz\n", is_60hz ? 60 : 50);
v4l2_ctrl_subdev_log_status(sd);
return 0;
}
/* --------------------------------------------------------------------------*/
static const struct v4l2_ctrl_ops tw9906_ctrl_ops = {
.s_ctrl = tw9906_s_ctrl,
};
static const struct v4l2_subdev_core_ops tw9906_core_ops = {
.log_status = tw9906_log_status,
};
static const struct v4l2_subdev_video_ops tw9906_video_ops = {
.s_std = tw9906_s_std,
.s_routing = tw9906_s_video_routing,
};
static const struct v4l2_subdev_ops tw9906_ops = {
.core = &tw9906_core_ops,
.video = &tw9906_video_ops,
};
static int tw9906_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct tw9906 *dec;
struct v4l2_subdev *sd;
struct v4l2_ctrl_handler *hdl;
/* Check if the adapter supports the needed features */
if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
return -EIO;
v4l_info(client, "chip found @ 0x%02x (%s)\n",
client->addr << 1, client->adapter->name);
dec = devm_kzalloc(&client->dev, sizeof(*dec), GFP_KERNEL);
if (dec == NULL)
return -ENOMEM;
sd = &dec->sd;
v4l2_i2c_subdev_init(sd, client, &tw9906_ops);
hdl = &dec->hdl;
v4l2_ctrl_handler_init(hdl, 4);
v4l2_ctrl_new_std(hdl, &tw9906_ctrl_ops,
V4L2_CID_BRIGHTNESS, -128, 127, 1, 0);
v4l2_ctrl_new_std(hdl, &tw9906_ctrl_ops,
V4L2_CID_CONTRAST, 0, 255, 1, 0x60);
v4l2_ctrl_new_std(hdl, &tw9906_ctrl_ops,
V4L2_CID_HUE, -128, 127, 1, 0);
sd->ctrl_handler = hdl;
if (hdl->error) {
int err = hdl->error;
v4l2_ctrl_handler_free(hdl);
return err;
}
/* Initialize tw9906 */
dec->norm = V4L2_STD_NTSC;
if (write_regs(sd, initial_registers) < 0) {
v4l2_err(client, "error initializing TW9906\n");
return -EINVAL;
}
return 0;
}
static int tw9906_remove(struct i2c_client *client)
{
struct v4l2_subdev *sd = i2c_get_clientdata(client);
v4l2_device_unregister_subdev(sd);
v4l2_ctrl_handler_free(&to_state(sd)->hdl);
return 0;
}
/* ----------------------------------------------------------------------- */
static const struct i2c_device_id tw9906_id[] = {
{ "tw9906", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, tw9906_id);
static struct i2c_driver tw9906_driver = {
.driver = {
.name = "tw9906",
},
.probe = tw9906_probe,
.remove = tw9906_remove,
.id_table = tw9906_id,
};
module_i2c_driver(tw9906_driver);
|
