aboutsummaryrefslogtreecommitdiff
path: root/drivers/media/video/bt856.c
blob: 3e042c5ddaa7ffa46f50414207087e707b9a7664 (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
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
240
241
242
243
244
245
246
247
248
249
/*
 * bt856 - BT856A Digital Video Encoder (Rockwell Part)
 *
 * Copyright (C) 1999 Mike Bernson <mike@mlb.org>
 * Copyright (C) 1998 Dave Perks <dperks@ibm.net>
 *
 * Modifications for LML33/DC10plus unified driver
 * Copyright (C) 2000 Serguei Miridonov <mirsev@cicese.mx>
 *
 * This code was modify/ported from the saa7111 driver written
 * by Dave Perks.
 *
 * Changes by Ronald Bultje <rbultje@ronald.bitfreak.net>
 *   - moved over to linux>=2.4.x i2c protocol (9/9/2002)
 *
 * 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; either version 2 of the License, or
 * (at your option) any later version.
 *
 * 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/ioctl.h>
#include <asm/uaccess.h>
#include <linux/i2c.h>
#include <linux/i2c-id.h>
#include <linux/videodev.h>
#include <linux/video_encoder.h>
#include <media/v4l2-common.h>
#include <media/v4l2-i2c-drv-legacy.h>

MODULE_DESCRIPTION("Brooktree-856A video encoder driver");
MODULE_AUTHOR("Mike Bernson & Dave Perks");
MODULE_LICENSE("GPL");

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

/* ----------------------------------------------------------------------- */

#define BT856_REG_OFFSET	0xDA
#define BT856_NR_REG		6

struct bt856 {
	unsigned char reg[BT856_NR_REG];

	v4l2_std_id norm;
};

/* ----------------------------------------------------------------------- */

static inline int bt856_write(struct i2c_client *client, u8 reg, u8 value)
{
	struct bt856 *encoder = i2c_get_clientdata(client);

	encoder->reg[reg - BT856_REG_OFFSET] = value;
	return i2c_smbus_write_byte_data(client, reg, value);
}

static inline int bt856_setbit(struct i2c_client *client, u8 reg, u8 bit, u8 value)
{
	struct bt856 *encoder = i2c_get_clientdata(client);

	return bt856_write(client, reg,
		(encoder->reg[reg - BT856_REG_OFFSET] & ~(1 << bit)) |
				(value ? (1 << bit) : 0));
}

static void bt856_dump(struct i2c_client *client)
{
	int i;
	struct bt856 *encoder = i2c_get_clientdata(client);

	v4l_info(client, "register dump:\n");
	for (i = 0; i < BT856_NR_REG; i += 2)
		printk(KERN_CONT " %02x", encoder->reg[i]);
	printk(KERN_CONT "\n");
}

/* ----------------------------------------------------------------------- */

static int bt856_command(struct i2c_client *client, unsigned cmd, void *arg)
{
	struct bt856 *encoder = i2c_get_clientdata(client);

	switch (cmd) {
	case VIDIOC_INT_INIT:
		/* This is just for testing!!! */
		v4l_dbg(1, debug, client, "init\n");
		bt856_write(client, 0xdc, 0x18);
		bt856_write(client, 0xda, 0);
		bt856_write(client, 0xde, 0);

		bt856_setbit(client, 0xdc, 3, 1);
		//bt856_setbit(client, 0xdc, 6, 0);
		bt856_setbit(client, 0xdc, 4, 1);

		if (encoder->norm & V4L2_STD_NTSC)
			bt856_setbit(client, 0xdc, 2, 0);
		else
			bt856_setbit(client, 0xdc, 2, 1);

		bt856_setbit(client, 0xdc, 1, 1);
		bt856_setbit(client, 0xde, 4, 0);
		bt856_setbit(client, 0xde, 3, 1);
		if (debug != 0)
			bt856_dump(client);
		break;

	case VIDIOC_INT_S_STD_OUTPUT:
	{
		v4l2_std_id *iarg = arg;

		v4l_dbg(1, debug, client, "set norm %llx\n", *iarg);

		if (*iarg & V4L2_STD_NTSC) {
			bt856_setbit(client, 0xdc, 2, 0);
		} else if (*iarg & V4L2_STD_PAL) {
			bt856_setbit(client, 0xdc, 2, 1);
			bt856_setbit(client, 0xda, 0, 0);
			//bt856_setbit(client, 0xda, 0, 1);
		} else {
			return -EINVAL;
		}
		encoder->norm = *iarg;
		if (debug != 0)
			bt856_dump(client);
		break;
	}

	case VIDIOC_INT_S_VIDEO_ROUTING:
	{
		struct v4l2_routing *route = arg;

		v4l_dbg(1, debug, client, "set input %d\n", route->input);

		/* We only have video bus.
		 * route->input= 0: input is from bt819
		 * route->input= 1: input is from ZR36060 */
		switch (route->input) {
		case 0:
			bt856_setbit(client, 0xde, 4, 0);
			bt856_setbit(client, 0xde, 3, 1);
			bt856_setbit(client, 0xdc, 3, 1);
			bt856_setbit(client, 0xdc, 6, 0);
			break;
		case 1:
			bt856_setbit(client, 0xde, 4, 0);
			bt856_setbit(client, 0xde, 3, 1);
			bt856_setbit(client, 0xdc, 3, 1);
			bt856_setbit(client, 0xdc, 6, 1);
			break;
		case 2:	// Color bar
			bt856_setbit(client, 0xdc, 3, 0);
			bt856_setbit(client, 0xde, 4, 1);
			break;
		default:
			return -EINVAL;
		}

		if (debug != 0)
			bt856_dump(client);
		break;
	}

	default:
		return -EINVAL;
	}

	return 0;
}

/* ----------------------------------------------------------------------- */

static unsigned short normal_i2c[] = { 0x88 >> 1, I2C_CLIENT_END };

I2C_CLIENT_INSMOD;

static int bt856_probe(struct i2c_client *client,
			const struct i2c_device_id *id)
{
	struct bt856 *encoder;

	/* Check if the adapter supports the needed features */
	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);

	encoder = kzalloc(sizeof(struct bt856), GFP_KERNEL);
	if (encoder == NULL)
		return -ENOMEM;
	encoder->norm = V4L2_STD_NTSC;
	i2c_set_clientdata(client, encoder);

	bt856_write(client, 0xdc, 0x18);
	bt856_write(client, 0xda, 0);
	bt856_write(client, 0xde, 0);

	bt856_setbit(client, 0xdc, 3, 1);
	//bt856_setbit(client, 0xdc, 6, 0);
	bt856_setbit(client, 0xdc, 4, 1);

	if (encoder->norm & V4L2_STD_NTSC)
		bt856_setbit(client, 0xdc, 2, 0);
	else
		bt856_setbit(client, 0xdc, 2, 1);

	bt856_setbit(client, 0xdc, 1, 1);
	bt856_setbit(client, 0xde, 4, 0);
	bt856_setbit(client, 0xde, 3, 1);

	if (debug != 0)
		bt856_dump(client);
	return 0;
}

static int bt856_remove(struct i2c_client *client)
{
	kfree(i2c_get_clientdata(client));
	return 0;
}

static const struct i2c_device_id bt856_id[] = {
	{ "bt856", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, bt856_id);

static struct v4l2_i2c_driver_data v4l2_i2c_data = {
	.name = "bt856",
	.driverid = I2C_DRIVERID_BT856,
	.command = bt856_command,
	.probe = bt856_probe,
	.remove = bt856_remove,
	.id_table = bt856_id,
};