aboutsummaryrefslogtreecommitdiff
path: root/drivers/media/video/bt8xx/bt832.c
blob: f92f06dec0d0a2fce3c09965e5e1b8570ca34acd (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
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
/* Driver for Bt832 CMOS Camera Video Processor
    i2c-addresses: 0x88 or 0x8a

  The BT832 interfaces to a Quartzsight Digital Camera (352x288, 25 or 30 fps)
  via a 9 pin connector ( 4-wire SDATA, 2-wire i2c, SCLK, VCC, GND).
  It outputs an 8-bit 4:2:2 YUV or YCrCb video signal which can be directly
  connected to bt848/bt878 GPIO pins on this purpose.
  (see: VLSI Vision Ltd. www.vvl.co.uk for camera datasheets)

  Supported Cards:
  -  Pixelview Rev.4E: 0x8a
		GPIO 0x400000 toggles Bt832 RESET, and the chip changes to i2c 0x88 !

  (c) Gunther Mayer, 2002

  STATUS:
  - detect chip and hexdump
  - reset chip and leave low power mode
  - detect camera present

  TODO:
  - make it work (find correct setup for Bt832 and Bt878)
*/

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/i2c.h>
#include <linux/types.h>
#include <linux/videodev.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <media/v4l2-common.h>

#include "bttv.h"
#include "bt832.h"

MODULE_LICENSE("GPL");

/* Addresses to scan */
static unsigned short normal_i2c[] = { I2C_ADDR_BT832_ALT1>>1, I2C_ADDR_BT832_ALT2>>1,
				       I2C_CLIENT_END };
I2C_CLIENT_INSMOD;

int debug;    /* debug output */
module_param(debug,            int, 0644);

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

static int bt832_detach(struct i2c_client *client);


static struct i2c_driver driver;
static struct i2c_client client_template;

struct bt832 {
	struct i2c_client client;
};

int bt832_hexdump(struct i2c_client *i2c_client_s, unsigned char *buf)
{
	int i,rc;
	buf[0]=0x80; // start at register 0 with auto-increment
	if (1 != (rc = i2c_master_send(i2c_client_s,buf,1)))
		v4l_err(i2c_client_s,"i2c i/o error: rc == %d (should be 1)\n",rc);

	for(i=0;i<65;i++)
		buf[i]=0;
	if (65 != (rc=i2c_master_recv(i2c_client_s,buf,65)))
		v4l_err(i2c_client_s,"i2c i/o error: rc == %d (should be 65)\n",rc);

	// Note: On READ the first byte is the current index
	//  (e.g. 0x80, what we just wrote)

	if(debug>1) {
		int i;
		v4l_dbg(2, debug,i2c_client_s,"hexdump:");
		for(i=1;i<65;i++) {
			if(i!=1) {
				if(((i-1)%8)==0) printk(" ");
				if(((i-1)%16)==0) {
					printk("\n");
					v4l_dbg(2, debug,i2c_client_s,"hexdump:");
				}
			}
			printk(" %02x",buf[i]);
		}
		printk("\n");
	}
	return 0;
}

// Return: 1 (is a bt832), 0 (No bt832 here)
int bt832_init(struct i2c_client *i2c_client_s)
{
	unsigned char *buf;
	int rc;

	buf=kmalloc(65,GFP_KERNEL);
	if (!buf) {
		v4l_err(&t->client,
			"Unable to allocate memory. Detaching.\n");
		return 0;
	}
	bt832_hexdump(i2c_client_s,buf);

	if(buf[0x40] != 0x31) {
		v4l_err(i2c_client_s,"This i2c chip is no bt832 (id=%02x). Detaching.\n",buf[0x40]);
		kfree(buf);
		return 0;
	}

	v4l_err(i2c_client_s,"Write 0 tp VPSTATUS\n");
	buf[0]=BT832_VP_STATUS; // Reg.52
	buf[1]= 0x00;
	if (2 != (rc = i2c_master_send(i2c_client_s,buf,2)))
		v4l_err(i2c_client_s,"i2c i/o error VPS: rc == %d (should be 2)\n",rc);

	bt832_hexdump(i2c_client_s,buf);


	// Leave low power mode:
	v4l_err(i2c_client_s,"leave low power mode.\n");
	buf[0]=BT832_CAM_SETUP0; //0x39 57
	buf[1]=0x08;
	if (2 != (rc = i2c_master_send(i2c_client_s,buf,2)))
		v4l_err(i2c_client_s,"i2c i/o error LLPM: rc == %d (should be 2)\n",rc);

	bt832_hexdump(i2c_client_s,buf);

	v4l_info(i2c_client_s,"Write 0 tp VPSTATUS\n");
	buf[0]=BT832_VP_STATUS; // Reg.52
	buf[1]= 0x00;
	if (2 != (rc = i2c_master_send(i2c_client_s,buf,2)))
		v4l_err(i2c_client_s,"i2c i/o error VPS: rc == %d (should be 2)\n",rc);

	bt832_hexdump(i2c_client_s,buf);


	// Enable Output
	v4l_info(i2c_client_s,"Enable Output\n");
	buf[0]=BT832_VP_CONTROL1; // Reg.40
	buf[1]= 0x27 & (~0x01); // Default | !skip
	if (2 != (rc = i2c_master_send(i2c_client_s,buf,2)))
		v4l_err(i2c_client_s,"i2c i/o error EO: rc == %d (should be 2)\n",rc);

	bt832_hexdump(i2c_client_s,buf);


	// for testing (even works when no camera attached)
	v4l_info(i2c_client_s,"*** Generate NTSC M Bars *****\n");
	buf[0]=BT832_VP_TESTCONTROL0; // Reg. 42
	buf[1]=3; // Generate NTSC System M bars, Generate Frame timing internally
	if (2 != (rc = i2c_master_send(i2c_client_s,buf,2)))
		v4l_info(i2c_client_s,"i2c i/o error MBAR: rc == %d (should be 2)\n",rc);

	v4l_info(i2c_client_s,"Camera Present: %s\n",
		(buf[1+BT832_CAM_STATUS] & BT832_56_CAMERA_PRESENT) ? "yes":"no");

	bt832_hexdump(i2c_client_s,buf);
	kfree(buf);
	return 1;
}



static int bt832_attach(struct i2c_adapter *adap, int addr, int kind)
{
	struct bt832 *t;

	client_template.adapter = adap;
	client_template.addr    = addr;

	if (NULL == (t = kzalloc(sizeof(*t), GFP_KERNEL)))
		return -ENOMEM;
	t->client = client_template;
	i2c_set_clientdata(&t->client, t);
	i2c_attach_client(&t->client);

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


	if(! bt832_init(&t->client)) {
		bt832_detach(&t->client);
		return -1;
	}

	return 0;
}

static int bt832_probe(struct i2c_adapter *adap)
{
	if (adap->class & I2C_CLASS_TV_ANALOG)
		return i2c_probe(adap, &addr_data, bt832_attach);
	return 0;
}

static int bt832_detach(struct i2c_client *client)
{
	struct bt832 *t = i2c_get_clientdata(client);

	v4l_info(&t->client,"dettach\n");
	i2c_detach_client(client);
	kfree(t);
	return 0;
}

static int
bt832_command(struct i2c_client *client, unsigned int cmd, void *arg)
{
	struct bt832 *t = i2c_get_clientdata(client);

	if (debug>1)
		v4l_i2c_print_ioctl(&t->client,cmd);

	switch (cmd) {
		case BT832_HEXDUMP: {
			unsigned char *buf;
			buf = kmalloc(65, GFP_KERNEL);
			if (!buf) {
				v4l_err(&t->client,
					"Unable to allocate memory\n");
				break;
			}
			bt832_hexdump(&t->client,buf);
			kfree(buf);
		}
		break;
		case BT832_REATTACH:
			v4l_info(&t->client,"re-attach\n");
			i2c_del_driver(&driver);
			i2c_add_driver(&driver);
		break;
	}
	return 0;
}

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

static struct i2c_driver driver = {
	.driver = {
		.name   = "bt832",
	},
	.id             = 0, /* FIXME */
	.attach_adapter = bt832_probe,
	.detach_client  = bt832_detach,
	.command        = bt832_command,
};
static struct i2c_client client_template =
{
	.name       = "bt832",
	.driver     = &driver,
};


static int __init bt832_init_module(void)
{
	return i2c_add_driver(&driver);
}

static void __exit bt832_cleanup_module(void)
{
	i2c_del_driver(&driver);
}

module_init(bt832_init_module);
module_exit(bt832_cleanup_module);

/*
 * Overrides for Emacs so that we follow Linus's tabbing style.
 * ---------------------------------------------------------------------------
 * Local variables:
 * c-basic-offset: 8
 * End:
 */