1 /* Driver for Bt832 CMOS Camera Video Processor
2 i2c-addresses: 0x88 or 0x8a
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)
11 - Pixelview Rev.4E: 0x8a
12 GPIO 0x400000 toggles Bt832 RESET, and the chip changes to i2c 0x88 !
14 (c) Gunther Mayer, 2002
17 - detect chip and hexdump
18 - reset chip and leave low power mode
19 - detect camera present
22 - make it work (find correct setup for Bt832 and Bt878)
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>
34 #include <media/audiochip.h>
38 MODULE_LICENSE("GPL");
40 /* Addresses to scan */
41 static unsigned short normal_i2c[] = { I2C_BT832_ALT1>>1, I2C_BT832_ALT2>>1,
45 /* ---------------------------------------------------------------------- */
47 #define dprintk if (debug) printk
49 static int bt832_detach(struct i2c_client *client);
52 static struct i2c_driver driver;
53 static struct i2c_client client_template;
56 struct i2c_client client;
59 int bt832_hexdump(struct i2c_client *i2c_client_s, unsigned char *buf)
62 buf[0]=0x80; // start at register 0 with auto-increment
63 if (1 != (rc = i2c_master_send(i2c_client_s,buf,1)))
64 printk("bt832: i2c i/o error: rc == %d (should be 1)\n",rc);
68 if (65 != (rc=i2c_master_recv(i2c_client_s,buf,65)))
69 printk("bt832: i2c i/o error: rc == %d (should be 65)\n",rc);
71 // Note: On READ the first byte is the current index
72 // (e.g. 0x80, what we just wrote)
76 printk("BT832 hexdump:\n");
79 if(((i-1)%8)==0) printk(" ");
80 if(((i-1)%16)==0) printk("\n");
82 printk(" %02x",buf[i]);
89 // Return: 1 (is a bt832), 0 (No bt832 here)
90 int bt832_init(struct i2c_client *i2c_client_s)
95 buf=kmalloc(65,GFP_KERNEL);
96 bt832_hexdump(i2c_client_s,buf);
98 if(buf[0x40] != 0x31) {
99 printk("bt832: this i2c chip is no bt832 (id=%02x). Detaching.\n",buf[0x40]);
104 printk("Write 0 tp VPSTATUS\n");
105 buf[0]=BT832_VP_STATUS; // Reg.52
107 if (2 != (rc = i2c_master_send(i2c_client_s,buf,2)))
108 printk("bt832: i2c i/o error VPS: rc == %d (should be 2)\n",rc);
110 bt832_hexdump(i2c_client_s,buf);
113 // Leave low power mode:
114 printk("Bt832: leave low power mode.\n");
115 buf[0]=BT832_CAM_SETUP0; //0x39 57
117 if (2 != (rc = i2c_master_send(i2c_client_s,buf,2)))
118 printk("bt832: i2c i/o error LLPM: rc == %d (should be 2)\n",rc);
120 bt832_hexdump(i2c_client_s,buf);
122 printk("Write 0 tp VPSTATUS\n");
123 buf[0]=BT832_VP_STATUS; // Reg.52
125 if (2 != (rc = i2c_master_send(i2c_client_s,buf,2)))
126 printk("bt832: i2c i/o error VPS: rc == %d (should be 2)\n",rc);
128 bt832_hexdump(i2c_client_s,buf);
132 printk("Enable Output\n");
133 buf[0]=BT832_VP_CONTROL1; // Reg.40
134 buf[1]= 0x27 & (~0x01); // Default | !skip
135 if (2 != (rc = i2c_master_send(i2c_client_s,buf,2)))
136 printk("bt832: i2c i/o error EO: rc == %d (should be 2)\n",rc);
138 bt832_hexdump(i2c_client_s,buf);
141 // for testing (even works when no camera attached)
142 printk("bt832: *** Generate NTSC M Bars *****\n");
143 buf[0]=BT832_VP_TESTCONTROL0; // Reg. 42
144 buf[1]=3; // Generate NTSC System M bars, Generate Frame timing internally
145 if (2 != (rc = i2c_master_send(i2c_client_s,buf,2)))
146 printk("bt832: i2c i/o error MBAR: rc == %d (should be 2)\n",rc);
148 printk("Bt832: Camera Present: %s\n",
149 (buf[1+BT832_CAM_STATUS] & BT832_56_CAMERA_PRESENT) ? "yes":"no");
151 bt832_hexdump(i2c_client_s,buf);
158 static int bt832_attach(struct i2c_adapter *adap, int addr, int kind)
162 printk("bt832_attach\n");
164 client_template.adapter = adap;
165 client_template.addr = addr;
167 printk("bt832: chip found @ 0x%x\n", addr<<1);
169 if (NULL == (t = kmalloc(sizeof(*t), GFP_KERNEL)))
171 memset(t,0,sizeof(*t));
172 t->client = client_template;
173 i2c_set_clientdata(&t->client, t);
174 i2c_attach_client(&t->client);
176 if(! bt832_init(&t->client)) {
177 bt832_detach(&t->client);
184 static int bt832_probe(struct i2c_adapter *adap)
186 if (adap->class & I2C_CLASS_TV_ANALOG)
187 return i2c_probe(adap, &addr_data, bt832_attach);
191 static int bt832_detach(struct i2c_client *client)
193 struct bt832 *t = i2c_get_clientdata(client);
195 printk("bt832: detach.\n");
196 i2c_detach_client(client);
202 bt832_command(struct i2c_client *client, unsigned int cmd, void *arg)
204 struct bt832 *t = i2c_get_clientdata(client);
206 printk("bt832: command %x\n",cmd);
209 case BT832_HEXDUMP: {
211 buf=kmalloc(65,GFP_KERNEL);
212 bt832_hexdump(&t->client,buf);
217 printk("bt832: re-attach\n");
218 i2c_del_driver(&driver);
219 i2c_add_driver(&driver);
225 /* ----------------------------------------------------------------------- */
227 static struct i2c_driver driver = {
229 .name = "i2c bt832 driver",
231 .id = -1, /* FIXME */
232 .attach_adapter = bt832_probe,
233 .detach_client = bt832_detach,
234 .command = bt832_command,
236 static struct i2c_client client_template =
243 static int __init bt832_init_module(void)
245 return i2c_add_driver(&driver);
248 static void __exit bt832_cleanup_module(void)
250 i2c_del_driver(&driver);
253 module_init(bt832_init_module);
254 module_exit(bt832_cleanup_module);
257 * Overrides for Emacs so that we follow Linus's tabbing style.
258 * ---------------------------------------------------------------------------