1/* Driver for Bt832 CMOS Camera Video Processor
2    i2c-addresses: 0x88 or 0x8a
3
4  The BT832 interfaces to a Quartzsight Digital Camera (352x288, 25 or 30 fps)
5  via a 9 pin connector ( 4-wire SDATA, 2-wire i2c, SCLK, VCC, GND).
6  It outputs an 8-bit 4:2:2 YUV or YCrCb video signal which can be directly
7  connected to bt848/bt878 GPIO pins on this purpose.
8  (see: VLSI Vision Ltd. www.vvl.co.uk for camera datasheets)
9
10  Supported Cards:
11  -  Pixelview Rev.4E: 0x8a
12		GPIO 0x400000 toggles Bt832 RESET, and the chip changes to i2c 0x88 !
13
14  (c) Gunther Mayer, 2002
15
16  STATUS:
17  - detect chip and hexdump
18  - reset chip and leave low power mode
19  - detect camera present
20
21  TODO:
22  - make it work (find correct setup for Bt832 and Bt878)
23*/
24
25#include <linux/module.h>
26#include <linux/kernel.h>
27#include <linux/i2c.h>
28#include <linux/types.h>
29#include <linux/videodev.h>
30#include <linux/init.h>
31#include <linux/errno.h>
32#include <linux/slab.h>
33#include <media/v4l2-common.h>
34
35#include "bttv.h"
36#include "bt832.h"
37
38MODULE_LICENSE("GPL");
39
40/* Addresses to scan */
41static unsigned short normal_i2c[] = { I2C_ADDR_BT832_ALT1>>1, I2C_ADDR_BT832_ALT2>>1,
42				       I2C_CLIENT_END };
43I2C_CLIENT_INSMOD;
44
45int debug;    /* debug output */
46module_param(debug,            int, 0644);
47
48/* ---------------------------------------------------------------------- */
49
50static int bt832_detach(struct i2c_client *client);
51
52
53static struct i2c_driver driver;
54static struct i2c_client client_template;
55
56struct bt832 {
57	struct i2c_client client;
58};
59
60int bt832_hexdump(struct i2c_client *i2c_client_s, unsigned char *buf)
61{
62	int i,rc;
63	buf[0]=0x80; // start at register 0 with auto-increment
64	if (1 != (rc = i2c_master_send(i2c_client_s,buf,1)))
65		v4l_err(i2c_client_s,"i2c i/o error: rc == %d (should be 1)\n",rc);
66
67	for(i=0;i<65;i++)
68		buf[i]=0;
69	if (65 != (rc=i2c_master_recv(i2c_client_s,buf,65)))
70		v4l_err(i2c_client_s,"i2c i/o error: rc == %d (should be 65)\n",rc);
71
72	// Note: On READ the first byte is the current index
73	//  (e.g. 0x80, what we just wrote)
74
75	if(debug>1) {
76		int i;
77		v4l_dbg(2, debug,i2c_client_s,"hexdump:");
78		for(i=1;i<65;i++) {
79			if(i!=1) {
80				if(((i-1)%8)==0) printk(" ");
81				if(((i-1)%16)==0) {
82					printk("\n");
83					v4l_dbg(2, debug,i2c_client_s,"hexdump:");
84				}
85			}
86			printk(" %02x",buf[i]);
87		}
88		printk("\n");
89	}
90	return 0;
91}
92
93// Return: 1 (is a bt832), 0 (No bt832 here)
94int bt832_init(struct i2c_client *i2c_client_s)
95{
96	unsigned char *buf;
97	int rc;
98
99	buf=kmalloc(65,GFP_KERNEL);
100	bt832_hexdump(i2c_client_s,buf);
101
102	if(buf[0x40] != 0x31) {
103		v4l_err(i2c_client_s,"This i2c chip is no bt832 (id=%02x). Detaching.\n",buf[0x40]);
104		kfree(buf);
105		return 0;
106	}
107
108	v4l_err(i2c_client_s,"Write 0 tp VPSTATUS\n");
109	buf[0]=BT832_VP_STATUS; // Reg.52
110	buf[1]= 0x00;
111	if (2 != (rc = i2c_master_send(i2c_client_s,buf,2)))
112		v4l_err(i2c_client_s,"i2c i/o error VPS: rc == %d (should be 2)\n",rc);
113
114	bt832_hexdump(i2c_client_s,buf);
115
116
117	// Leave low power mode:
118	v4l_err(i2c_client_s,"leave low power mode.\n");
119	buf[0]=BT832_CAM_SETUP0; //0x39 57
120	buf[1]=0x08;
121	if (2 != (rc = i2c_master_send(i2c_client_s,buf,2)))
122		v4l_err(i2c_client_s,"i2c i/o error LLPM: rc == %d (should be 2)\n",rc);
123
124	bt832_hexdump(i2c_client_s,buf);
125
126	v4l_info(i2c_client_s,"Write 0 tp VPSTATUS\n");
127	buf[0]=BT832_VP_STATUS; // Reg.52
128	buf[1]= 0x00;
129	if (2 != (rc = i2c_master_send(i2c_client_s,buf,2)))
130		v4l_err(i2c_client_s,"i2c i/o error VPS: rc == %d (should be 2)\n",rc);
131
132	bt832_hexdump(i2c_client_s,buf);
133
134
135	// Enable Output
136	v4l_info(i2c_client_s,"Enable Output\n");
137	buf[0]=BT832_VP_CONTROL1; // Reg.40
138	buf[1]= 0x27 & (~0x01); // Default | !skip
139	if (2 != (rc = i2c_master_send(i2c_client_s,buf,2)))
140		v4l_err(i2c_client_s,"i2c i/o error EO: rc == %d (should be 2)\n",rc);
141
142	bt832_hexdump(i2c_client_s,buf);
143
144
145	// for testing (even works when no camera attached)
146	v4l_info(i2c_client_s,"*** Generate NTSC M Bars *****\n");
147	buf[0]=BT832_VP_TESTCONTROL0; // Reg. 42
148	buf[1]=3; // Generate NTSC System M bars, Generate Frame timing internally
149	if (2 != (rc = i2c_master_send(i2c_client_s,buf,2)))
150		v4l_info(i2c_client_s,"i2c i/o error MBAR: rc == %d (should be 2)\n",rc);
151
152	v4l_info(i2c_client_s,"Camera Present: %s\n",
153		(buf[1+BT832_CAM_STATUS] & BT832_56_CAMERA_PRESENT) ? "yes":"no");
154
155	bt832_hexdump(i2c_client_s,buf);
156	kfree(buf);
157	return 1;
158}
159
160
161
162static int bt832_attach(struct i2c_adapter *adap, int addr, int kind)
163{
164	struct bt832 *t;
165
166	client_template.adapter = adap;
167	client_template.addr    = addr;
168
169	if (NULL == (t = kzalloc(sizeof(*t), GFP_KERNEL)))
170		return -ENOMEM;
171	t->client = client_template;
172	i2c_set_clientdata(&t->client, t);
173	i2c_attach_client(&t->client);
174
175	v4l_info(&t->client,"chip found @ 0x%x\n", addr<<1);
176
177
178	if(! bt832_init(&t->client)) {
179		bt832_detach(&t->client);
180		return -1;
181	}
182
183	return 0;
184}
185
186static int bt832_probe(struct i2c_adapter *adap)
187{
188	if (adap->class & I2C_CLASS_TV_ANALOG)
189		return i2c_probe(adap, &addr_data, bt832_attach);
190	return 0;
191}
192
193static int bt832_detach(struct i2c_client *client)
194{
195	struct bt832 *t = i2c_get_clientdata(client);
196
197	v4l_info(&t->client,"dettach\n");
198	i2c_detach_client(client);
199	kfree(t);
200	return 0;
201}
202
203static int
204bt832_command(struct i2c_client *client, unsigned int cmd, void *arg)
205{
206	struct bt832 *t = i2c_get_clientdata(client);
207
208	if (debug>1)
209		v4l_i2c_print_ioctl(&t->client,cmd);
210
211	switch (cmd) {
212		case BT832_HEXDUMP: {
213			unsigned char *buf;
214			buf=kmalloc(65,GFP_KERNEL);
215			bt832_hexdump(&t->client,buf);
216			kfree(buf);
217		}
218		break;
219		case BT832_REATTACH:
220			v4l_info(&t->client,"re-attach\n");
221			i2c_del_driver(&driver);
222			i2c_add_driver(&driver);
223		break;
224	}
225	return 0;
226}
227
228/* ----------------------------------------------------------------------- */
229
230static struct i2c_driver driver = {
231	.driver = {
232		.name   = "bt832",
233	},
234	.id             = 0,
235	.attach_adapter = bt832_probe,
236	.detach_client  = bt832_detach,
237	.command        = bt832_command,
238};
239static struct i2c_client client_template =
240{
241	.name       = "bt832",
242	.driver     = &driver,
243};
244
245
246static int __init bt832_init_module(void)
247{
248	return i2c_add_driver(&driver);
249}
250
251static void __exit bt832_cleanup_module(void)
252{
253	i2c_del_driver(&driver);
254}
255
256module_init(bt832_init_module);
257module_exit(bt832_cleanup_module);
258
259/*
260 * Overrides for Emacs so that we follow Linus's tabbing style.
261 * ---------------------------------------------------------------------------
262 * Local variables:
263 * c-basic-offset: 8
264 * End:
265 */
266