Merge branch 'upstream-jgarzik' of git://git.tuxdriver.com/git/netdev-jwl
[linux-2.6] / drivers / media / video / bt832.c
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 <media/audiochip.h>
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_BT832_ALT1>>1, I2C_BT832_ALT2>>1,
42                                        I2C_CLIENT_END };
43 I2C_CLIENT_INSMOD;
44
45 /* ---------------------------------------------------------------------- */
46
47 #define dprintk     if (debug) printk
48
49 static int bt832_detach(struct i2c_client *client);
50
51
52 static struct i2c_driver driver;
53 static struct i2c_client client_template;
54
55 struct bt832 {
56         struct i2c_client client;
57 };
58
59 int bt832_hexdump(struct i2c_client *i2c_client_s, unsigned char *buf)
60 {
61         int i,rc;
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);
65
66         for(i=0;i<65;i++)
67                 buf[i]=0;
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);
70
71         // Note: On READ the first byte is the current index
72         //  (e.g. 0x80, what we just wrote)
73
74         if(1) {
75                 int i;
76                 printk("BT832 hexdump:\n");
77                 for(i=1;i<65;i++) {
78                         if(i!=1) {
79                           if(((i-1)%8)==0) printk(" ");
80                           if(((i-1)%16)==0) printk("\n");
81                         }
82                         printk(" %02x",buf[i]);
83                 }
84                 printk("\n");
85         }
86         return 0;
87 }
88
89 // Return: 1 (is a bt832), 0 (No bt832 here)
90 int bt832_init(struct i2c_client *i2c_client_s)
91 {
92         unsigned char *buf;
93         int rc;
94
95         buf=kmalloc(65,GFP_KERNEL);
96         bt832_hexdump(i2c_client_s,buf);
97
98         if(buf[0x40] != 0x31) {
99                 printk("bt832: this i2c chip is no bt832 (id=%02x). Detaching.\n",buf[0x40]);
100                 kfree(buf);
101                 return 0;
102         }
103
104         printk("Write 0 tp VPSTATUS\n");
105         buf[0]=BT832_VP_STATUS; // Reg.52
106         buf[1]= 0x00;
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);
109
110         bt832_hexdump(i2c_client_s,buf);
111
112
113         // Leave low power mode:
114         printk("Bt832: leave low power mode.\n");
115         buf[0]=BT832_CAM_SETUP0; //0x39 57
116         buf[1]=0x08;
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);
119
120         bt832_hexdump(i2c_client_s,buf);
121
122         printk("Write 0 tp VPSTATUS\n");
123         buf[0]=BT832_VP_STATUS; // Reg.52
124         buf[1]= 0x00;
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);
127
128         bt832_hexdump(i2c_client_s,buf);
129
130
131         // Enable Output
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);
137
138         bt832_hexdump(i2c_client_s,buf);
139
140
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);
147
148         printk("Bt832: Camera Present: %s\n",
149                 (buf[1+BT832_CAM_STATUS] & BT832_56_CAMERA_PRESENT) ? "yes":"no");
150
151         bt832_hexdump(i2c_client_s,buf);
152         kfree(buf);
153         return 1;
154 }
155
156
157
158 static int bt832_attach(struct i2c_adapter *adap, int addr, int kind)
159 {
160         struct bt832 *t;
161
162         printk("bt832_attach\n");
163
164         client_template.adapter = adap;
165         client_template.addr    = addr;
166
167         printk("bt832: chip found @ 0x%x\n", addr<<1);
168
169         if (NULL == (t = kmalloc(sizeof(*t), GFP_KERNEL)))
170                 return -ENOMEM;
171         memset(t,0,sizeof(*t));
172         t->client = client_template;
173         i2c_set_clientdata(&t->client, t);
174         i2c_attach_client(&t->client);
175
176         if(! bt832_init(&t->client)) {
177                 bt832_detach(&t->client);
178                 return -1;
179         }
180
181         return 0;
182 }
183
184 static int bt832_probe(struct i2c_adapter *adap)
185 {
186 #ifdef I2C_CLASS_TV_ANALOG
187         if (adap->class & I2C_CLASS_TV_ANALOG)
188                 return i2c_probe(adap, &addr_data, bt832_attach);
189 #else
190         if (adap->id == I2C_HW_B_BT848)
191                 return i2c_probe(adap, &addr_data, bt832_attach);
192 #endif
193         return 0;
194 }
195
196 static int bt832_detach(struct i2c_client *client)
197 {
198         struct bt832 *t = i2c_get_clientdata(client);
199
200         printk("bt832: detach.\n");
201         i2c_detach_client(client);
202         kfree(t);
203         return 0;
204 }
205
206 static int
207 bt832_command(struct i2c_client *client, unsigned int cmd, void *arg)
208 {
209         struct bt832 *t = i2c_get_clientdata(client);
210
211         printk("bt832: command %x\n",cmd);
212
213         switch (cmd) {
214                 case BT832_HEXDUMP: {
215                         unsigned char *buf;
216                         buf=kmalloc(65,GFP_KERNEL);
217                         bt832_hexdump(&t->client,buf);
218                         kfree(buf);
219                 }
220                 break;
221                 case BT832_REATTACH:
222                         printk("bt832: re-attach\n");
223                         i2c_del_driver(&driver);
224                         i2c_add_driver(&driver);
225                 break;
226         }
227         return 0;
228 }
229
230 /* ----------------------------------------------------------------------- */
231
232 static struct i2c_driver driver = {
233         .owner          = THIS_MODULE,
234         .name           = "i2c bt832 driver",
235         .id             = -1, /* FIXME */
236         .flags          = I2C_DF_NOTIFY,
237         .attach_adapter = bt832_probe,
238         .detach_client  = bt832_detach,
239         .command        = bt832_command,
240 };
241 static struct i2c_client client_template =
242 {
243         .name       = "bt832",
244         .flags      = I2C_CLIENT_ALLOW_USE,
245         .driver     = &driver,
246 };
247
248
249 static int __init bt832_init_module(void)
250 {
251         return i2c_add_driver(&driver);
252 }
253
254 static void __exit bt832_cleanup_module(void)
255 {
256         i2c_del_driver(&driver);
257 }
258
259 module_init(bt832_init_module);
260 module_exit(bt832_cleanup_module);
261
262 /*
263  * Overrides for Emacs so that we follow Linus's tabbing style.
264  * ---------------------------------------------------------------------------
265  * Local variables:
266  * c-basic-offset: 8
267  * End:
268  */