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>
33 #include <media/audiochip.h>
34 #include <media/v4l2-common.h>
39 MODULE_LICENSE("GPL");
41 /* Addresses to scan */
42 static unsigned short normal_i2c
[] = { I2C_BT832_ALT1
>>1, I2C_BT832_ALT2
>>1,
46 int debug
; /* debug output */
47 module_param(debug
, int, 0644);
49 /* ---------------------------------------------------------------------- */
51 static int bt832_detach(struct i2c_client
*client
);
54 static struct i2c_driver driver
;
55 static struct i2c_client client_template
;
58 struct i2c_client client
;
61 int bt832_hexdump(struct i2c_client
*i2c_client_s
, unsigned char *buf
)
64 buf
[0]=0x80; // start at register 0 with auto-increment
65 if (1 != (rc
= i2c_master_send(i2c_client_s
,buf
,1)))
66 v4l_err(i2c_client_s
,"i2c i/o error: rc == %d (should be 1)\n",rc
);
70 if (65 != (rc
=i2c_master_recv(i2c_client_s
,buf
,65)))
71 v4l_err(i2c_client_s
,"i2c i/o error: rc == %d (should be 65)\n",rc
);
73 // Note: On READ the first byte is the current index
74 // (e.g. 0x80, what we just wrote)
78 v4l_dbg(2, debug
,i2c_client_s
,"hexdump:");
81 if(((i
-1)%8)==0) printk(" ");
84 v4l_dbg(2, debug
,i2c_client_s
,"hexdump:");
87 printk(" %02x",buf
[i
]);
94 // Return: 1 (is a bt832), 0 (No bt832 here)
95 int bt832_init(struct i2c_client
*i2c_client_s
)
100 buf
=kmalloc(65,GFP_KERNEL
);
101 bt832_hexdump(i2c_client_s
,buf
);
103 if(buf
[0x40] != 0x31) {
104 v4l_err(i2c_client_s
,"This i2c chip is no bt832 (id=%02x). Detaching.\n",buf
[0x40]);
109 v4l_err(i2c_client_s
,"Write 0 tp VPSTATUS\n");
110 buf
[0]=BT832_VP_STATUS
; // Reg.52
112 if (2 != (rc
= i2c_master_send(i2c_client_s
,buf
,2)))
113 v4l_err(i2c_client_s
,"i2c i/o error VPS: rc == %d (should be 2)\n",rc
);
115 bt832_hexdump(i2c_client_s
,buf
);
118 // Leave low power mode:
119 v4l_err(i2c_client_s
,"leave low power mode.\n");
120 buf
[0]=BT832_CAM_SETUP0
; //0x39 57
122 if (2 != (rc
= i2c_master_send(i2c_client_s
,buf
,2)))
123 v4l_err(i2c_client_s
,"i2c i/o error LLPM: rc == %d (should be 2)\n",rc
);
125 bt832_hexdump(i2c_client_s
,buf
);
127 v4l_info(i2c_client_s
,"Write 0 tp VPSTATUS\n");
128 buf
[0]=BT832_VP_STATUS
; // Reg.52
130 if (2 != (rc
= i2c_master_send(i2c_client_s
,buf
,2)))
131 v4l_err(i2c_client_s
,"i2c i/o error VPS: rc == %d (should be 2)\n",rc
);
133 bt832_hexdump(i2c_client_s
,buf
);
137 v4l_info(i2c_client_s
,"Enable Output\n");
138 buf
[0]=BT832_VP_CONTROL1
; // Reg.40
139 buf
[1]= 0x27 & (~0x01); // Default | !skip
140 if (2 != (rc
= i2c_master_send(i2c_client_s
,buf
,2)))
141 v4l_err(i2c_client_s
,"i2c i/o error EO: rc == %d (should be 2)\n",rc
);
143 bt832_hexdump(i2c_client_s
,buf
);
146 // for testing (even works when no camera attached)
147 v4l_info(i2c_client_s
,"*** Generate NTSC M Bars *****\n");
148 buf
[0]=BT832_VP_TESTCONTROL0
; // Reg. 42
149 buf
[1]=3; // Generate NTSC System M bars, Generate Frame timing internally
150 if (2 != (rc
= i2c_master_send(i2c_client_s
,buf
,2)))
151 v4l_info(i2c_client_s
,"i2c i/o error MBAR: rc == %d (should be 2)\n",rc
);
153 v4l_info(i2c_client_s
,"Camera Present: %s\n",
154 (buf
[1+BT832_CAM_STATUS
] & BT832_56_CAMERA_PRESENT
) ? "yes":"no");
156 bt832_hexdump(i2c_client_s
,buf
);
163 static int bt832_attach(struct i2c_adapter
*adap
, int addr
, int kind
)
167 client_template
.adapter
= adap
;
168 client_template
.addr
= addr
;
170 if (NULL
== (t
= kzalloc(sizeof(*t
), GFP_KERNEL
)))
172 t
->client
= client_template
;
173 i2c_set_clientdata(&t
->client
, t
);
174 i2c_attach_client(&t
->client
);
176 v4l_info(&t
->client
,"chip found @ 0x%x\n", addr
<<1);
179 if(! bt832_init(&t
->client
)) {
180 bt832_detach(&t
->client
);
187 static int bt832_probe(struct i2c_adapter
*adap
)
189 if (adap
->class & I2C_CLASS_TV_ANALOG
)
190 return i2c_probe(adap
, &addr_data
, bt832_attach
);
194 static int bt832_detach(struct i2c_client
*client
)
196 struct bt832
*t
= i2c_get_clientdata(client
);
198 v4l_info(&t
->client
,"dettach\n");
199 i2c_detach_client(client
);
205 bt832_command(struct i2c_client
*client
, unsigned int cmd
, void *arg
)
207 struct bt832
*t
= i2c_get_clientdata(client
);
210 v4l_i2c_print_ioctl(&t
->client
,cmd
);
213 case BT832_HEXDUMP
: {
215 buf
=kmalloc(65,GFP_KERNEL
);
216 bt832_hexdump(&t
->client
,buf
);
221 v4l_info(&t
->client
,"re-attach\n");
222 i2c_del_driver(&driver
);
223 i2c_add_driver(&driver
);
229 /* ----------------------------------------------------------------------- */
231 static struct i2c_driver driver
= {
236 .attach_adapter
= bt832_probe
,
237 .detach_client
= bt832_detach
,
238 .command
= bt832_command
,
240 static struct i2c_client client_template
=
247 static int __init
bt832_init_module(void)
249 return i2c_add_driver(&driver
);
252 static void __exit
bt832_cleanup_module(void)
254 i2c_del_driver(&driver
);
257 module_init(bt832_init_module
);
258 module_exit(bt832_cleanup_module
);
261 * Overrides for Emacs so that we follow Linus's tabbing style.
262 * ---------------------------------------------------------------------------