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Linux kernel mirror (for testing)
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linux
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
34#include "id.h"
35#include "audiochip.h"
36#include "bttv.h"
37#include "bt832.h"
38
39MODULE_LICENSE("GPL");
40
41/* Addresses to scan */
42static unsigned short normal_i2c[] = {I2C_CLIENT_END};
43static unsigned short normal_i2c_range[] = {I2C_BT832_ALT1>>1,I2C_BT832_ALT2>>1,I2C_CLIENT_END};
44I2C_CLIENT_INSMOD;
45
46/* ---------------------------------------------------------------------- */
47
48#define dprintk if (debug) printk
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 printk("bt832: 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 printk("bt832: 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(1) {
76 int i;
77 printk("BT832 hexdump:\n");
78 for(i=1;i<65;i++) {
79 if(i!=1) {
80 if(((i-1)%8)==0) printk(" ");
81 if(((i-1)%16)==0) printk("\n");
82 }
83 printk(" %02x",buf[i]);
84 }
85 printk("\n");
86 }
87 return 0;
88}
89
90// Return: 1 (is a bt832), 0 (No bt832 here)
91int bt832_init(struct i2c_client *i2c_client_s)
92{
93 unsigned char *buf;
94 int rc;
95
96 buf=kmalloc(65,GFP_KERNEL);
97 bt832_hexdump(i2c_client_s,buf);
98
99 if(buf[0x40] != 0x31) {
100 printk("bt832: this i2c chip is no bt832 (id=%02x). Detaching.\n",buf[0x40]);
101 kfree(buf);
102 return 0;
103 }
104
105 printk("Write 0 tp VPSTATUS\n");
106 buf[0]=BT832_VP_STATUS; // Reg.52
107 buf[1]= 0x00;
108 if (2 != (rc = i2c_master_send(i2c_client_s,buf,2)))
109 printk("bt832: i2c i/o error VPS: rc == %d (should be 2)\n",rc);
110
111 bt832_hexdump(i2c_client_s,buf);
112
113
114 // Leave low power mode:
115 printk("Bt832: leave low power mode.\n");
116 buf[0]=BT832_CAM_SETUP0; //0x39 57
117 buf[1]=0x08;
118 if (2 != (rc = i2c_master_send(i2c_client_s,buf,2)))
119 printk("bt832: i2c i/o error LLPM: rc == %d (should be 2)\n",rc);
120
121 bt832_hexdump(i2c_client_s,buf);
122
123 printk("Write 0 tp VPSTATUS\n");
124 buf[0]=BT832_VP_STATUS; // Reg.52
125 buf[1]= 0x00;
126 if (2 != (rc = i2c_master_send(i2c_client_s,buf,2)))
127 printk("bt832: i2c i/o error VPS: rc == %d (should be 2)\n",rc);
128
129 bt832_hexdump(i2c_client_s,buf);
130
131
132 // Enable Output
133 printk("Enable Output\n");
134 buf[0]=BT832_VP_CONTROL1; // Reg.40
135 buf[1]= 0x27 & (~0x01); // Default | !skip
136 if (2 != (rc = i2c_master_send(i2c_client_s,buf,2)))
137 printk("bt832: i2c i/o error EO: rc == %d (should be 2)\n",rc);
138
139 bt832_hexdump(i2c_client_s,buf);
140
141#if 0
142 // Full 30/25 Frame rate
143 printk("Full 30/25 Frame rate\n");
144 buf[0]=BT832_VP_CONTROL0; // Reg.39
145 buf[1]= 0x00;
146 if (2 != (rc = i2c_master_send(i2c_client_s,buf,2)))
147 printk("bt832: i2c i/o error FFR: rc == %d (should be 2)\n",rc);
148
149 bt832_hexdump(i2c_client_s,buf);
150#endif
151
152#if 1
153 // for testing (even works when no camera attached)
154 printk("bt832: *** Generate NTSC M Bars *****\n");
155 buf[0]=BT832_VP_TESTCONTROL0; // Reg. 42
156 buf[1]=3; // Generate NTSC System M bars, Generate Frame timing internally
157 if (2 != (rc = i2c_master_send(i2c_client_s,buf,2)))
158 printk("bt832: i2c i/o error MBAR: rc == %d (should be 2)\n",rc);
159#endif
160
161 printk("Bt832: Camera Present: %s\n",
162 (buf[1+BT832_CAM_STATUS] & BT832_56_CAMERA_PRESENT) ? "yes":"no");
163
164 bt832_hexdump(i2c_client_s,buf);
165 kfree(buf);
166 return 1;
167}
168
169
170
171static int bt832_attach(struct i2c_adapter *adap, int addr,
172 unsigned short flags, int kind)
173{
174 struct bt832 *t;
175
176 printk("bt832_attach\n");
177
178 client_template.adapter = adap;
179 client_template.addr = addr;
180
181 printk("bt832: chip found @ 0x%x\n", addr<<1);
182
183 if (NULL == (t = kmalloc(sizeof(*t), GFP_KERNEL)))
184 return -ENOMEM;
185 memset(t,0,sizeof(*t));
186 t->client = client_template;
187 t->client.data = t;
188 i2c_attach_client(&t->client);
189
190 if(! bt832_init(&t->client)) {
191 bt832_detach(&t->client);
192 return -1;
193 }
194
195 return 0;
196}
197
198static int bt832_probe(struct i2c_adapter *adap)
199{
200 if (adap->class & I2C_CLASS_TV_ANALOG)
201 return i2c_probe(adap, &addr_data, bt832_attach);
202 return 0;
203}
204
205static int bt832_detach(struct i2c_client *client)
206{
207 struct bt832 *t = (struct bt832*)client->data;
208
209 printk("bt832: detach.\n");
210 i2c_detach_client(client);
211 kfree(t);
212 return 0;
213}
214
215static int
216bt832_command(struct i2c_client *client, unsigned int cmd, void *arg)
217{
218 struct bt832 *t = (struct bt832*)client->data;
219
220 printk("bt832: command %x\n",cmd);
221
222 switch (cmd) {
223 case BT832_HEXDUMP: {
224 unsigned char *buf;
225 buf=kmalloc(65,GFP_KERNEL);
226 bt832_hexdump(&t->client,buf);
227 kfree(buf);
228 }
229 break;
230 case BT832_REATTACH:
231 printk("bt832: re-attach\n");
232 i2c_del_driver(&driver);
233 i2c_add_driver(&driver);
234 break;
235 }
236 return 0;
237}
238
239/* ----------------------------------------------------------------------- */
240
241static struct i2c_driver driver = {
242 .owner = THIS_MODULE,
243 .name = "i2c bt832 driver",
244 .id = -1, /* FIXME */
245 .flags = I2C_DF_NOTIFY,
246 .attach_adapter = bt832_probe,
247 .detach_client = bt832_detach,
248 .command = bt832_command,
249};
250static struct i2c_client client_template =
251{
252 .name = "bt832",
253 .flags = I2C_CLIENT_ALLOW_USE,
254 .driver = &driver,
255};
256
257
258int bt832_init_module(void)
259{
260 i2c_add_driver(&driver);
261 return 0;
262}
263
264static void bt832_cleanup_module(void)
265{
266 i2c_del_driver(&driver);
267}
268
269module_init(bt832_init_module);
270module_exit(bt832_cleanup_module);
271