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
38 MODULE_LICENSE("GPL");
39
40 /* Addresses to scan */
41 static unsigned short normal_i2c[] = { I2C_ADDR_BT832_ALT1>>1, I2C_ADDR_BT832_ALT2>>1,
42 I2C_CLIENT_END };
43 I2C_CLIENT_INSMOD;
44
45 int debug; /* debug output */
46 module_param(debug, int, 0644);
47
48 /* ---------------------------------------------------------------------- */
49
50 static int bt832_detach(struct i2c_client *client);
51
52
53 static struct i2c_driver driver;
54 static struct i2c_client client_template;
55
56 struct bt832 {
57 struct i2c_client client;
58 };
59
60 int 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)
94 int 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
162 static 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
186 static 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
193 static 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
203 static int
204 bt832_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
230 static struct i2c_driver driver = {
231 .driver = {
232 .name = "bt832",
233 },
234 .id = 0, /* FIXME */
235 .attach_adapter = bt832_probe,
236 .detach_client = bt832_detach,
237 .command = bt832_command,
238 };
239 static struct i2c_client client_template =
240 {
241 .name = "bt832",
242 .driver = &driver,
243 };
244
245
246 static int __init bt832_init_module(void)
247 {
248 return i2c_add_driver(&driver);
249 }
250
251 static void __exit bt832_cleanup_module(void)
252 {
253 i2c_del_driver(&driver);
254 }
255
256 module_init(bt832_init_module);
257 module_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
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