Merge branch 'for-2.6.28' of git://linux-nfs.org/~bfields/linux
[linux-2.6] / drivers / media / video / bt856.c
1 /*
2  * bt856 - BT856A Digital Video Encoder (Rockwell Part)
3  *
4  * Copyright (C) 1999 Mike Bernson <mike@mlb.org>
5  * Copyright (C) 1998 Dave Perks <dperks@ibm.net>
6  *
7  * Modifications for LML33/DC10plus unified driver
8  * Copyright (C) 2000 Serguei Miridonov <mirsev@cicese.mx>
9  *
10  * This code was modify/ported from the saa7111 driver written
11  * by Dave Perks.
12  *
13  * Changes by Ronald Bultje <rbultje@ronald.bitfreak.net>
14  *   - moved over to linux>=2.4.x i2c protocol (9/9/2002)
15  *
16  * This program is free software; you can redistribute it and/or modify
17  * it under the terms of the GNU General Public License as published by
18  * the Free Software Foundation; either version 2 of the License, or
19  * (at your option) any later version.
20  *
21  * This program is distributed in the hope that it will be useful,
22  * but WITHOUT ANY WARRANTY; without even the implied warranty of
23  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
24  * GNU General Public License for more details.
25  *
26  * You should have received a copy of the GNU General Public License
27  * along with this program; if not, write to the Free Software
28  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
29  */
30
31 #include <linux/module.h>
32 #include <linux/init.h>
33 #include <linux/delay.h>
34 #include <linux/errno.h>
35 #include <linux/fs.h>
36 #include <linux/kernel.h>
37 #include <linux/major.h>
38 #include <linux/slab.h>
39 #include <linux/mm.h>
40 #include <linux/signal.h>
41 #include <linux/types.h>
42 #include <linux/i2c.h>
43 #include <linux/video_encoder.h>
44 #include <asm/io.h>
45 #include <asm/pgtable.h>
46 #include <asm/page.h>
47 #include <asm/uaccess.h>
48
49 #include <linux/videodev.h>
50
51 MODULE_DESCRIPTION("Brooktree-856A video encoder driver");
52 MODULE_AUTHOR("Mike Bernson & Dave Perks");
53 MODULE_LICENSE("GPL");
54
55
56 #define I2C_NAME(s) (s)->name
57
58
59 static int debug;
60 module_param(debug, int, 0);
61 MODULE_PARM_DESC(debug, "Debug level (0-1)");
62
63 #define dprintk(num, format, args...) \
64         do { \
65                 if (debug >= num) \
66                         printk(format, ##args); \
67         } while (0)
68
69 /* ----------------------------------------------------------------------- */
70
71 #define BT856_REG_OFFSET        0xDA
72 #define BT856_NR_REG            6
73
74 struct bt856 {
75         unsigned char reg[BT856_NR_REG];
76
77         int norm;
78         int enable;
79 };
80
81 #define   I2C_BT856        0x88
82
83 /* ----------------------------------------------------------------------- */
84
85 static inline int
86 bt856_write (struct i2c_client *client,
87              u8                 reg,
88              u8                 value)
89 {
90         struct bt856 *encoder = i2c_get_clientdata(client);
91
92         encoder->reg[reg - BT856_REG_OFFSET] = value;
93         return i2c_smbus_write_byte_data(client, reg, value);
94 }
95
96 static inline int
97 bt856_setbit (struct i2c_client *client,
98               u8                 reg,
99               u8                 bit,
100               u8                 value)
101 {
102         struct bt856 *encoder = i2c_get_clientdata(client);
103
104         return bt856_write(client, reg,
105                            (encoder->
106                             reg[reg - BT856_REG_OFFSET] & ~(1 << bit)) |
107                             (value ? (1 << bit) : 0));
108 }
109
110 static void
111 bt856_dump (struct i2c_client *client)
112 {
113         int i;
114         struct bt856 *encoder = i2c_get_clientdata(client);
115
116         printk(KERN_INFO "%s: register dump:", I2C_NAME(client));
117         for (i = 0; i < BT856_NR_REG; i += 2)
118                 printk(" %02x", encoder->reg[i]);
119         printk("\n");
120 }
121
122 /* ----------------------------------------------------------------------- */
123
124 static int
125 bt856_command (struct i2c_client *client,
126                unsigned int       cmd,
127                void              *arg)
128 {
129         struct bt856 *encoder = i2c_get_clientdata(client);
130
131         switch (cmd) {
132
133         case 0:
134                 /* This is just for testing!!! */
135                 dprintk(1, KERN_INFO "bt856: init\n");
136                 bt856_write(client, 0xdc, 0x18);
137                 bt856_write(client, 0xda, 0);
138                 bt856_write(client, 0xde, 0);
139
140                 bt856_setbit(client, 0xdc, 3, 1);
141                 //bt856_setbit(client, 0xdc, 6, 0);
142                 bt856_setbit(client, 0xdc, 4, 1);
143
144                 switch (encoder->norm) {
145
146                 case VIDEO_MODE_NTSC:
147                         bt856_setbit(client, 0xdc, 2, 0);
148                         break;
149
150                 case VIDEO_MODE_PAL:
151                         bt856_setbit(client, 0xdc, 2, 1);
152                         break;
153                 }
154
155                 bt856_setbit(client, 0xdc, 1, 1);
156                 bt856_setbit(client, 0xde, 4, 0);
157                 bt856_setbit(client, 0xde, 3, 1);
158                 if (debug != 0)
159                         bt856_dump(client);
160                 break;
161
162         case ENCODER_GET_CAPABILITIES:
163         {
164                 struct video_encoder_capability *cap = arg;
165
166                 dprintk(1, KERN_INFO "%s: get capabilities\n",
167                         I2C_NAME(client));
168
169                 cap->flags = VIDEO_ENCODER_PAL |
170                              VIDEO_ENCODER_NTSC |
171                              VIDEO_ENCODER_CCIR;
172                 cap->inputs = 2;
173                 cap->outputs = 1;
174         }
175                 break;
176
177         case ENCODER_SET_NORM:
178         {
179                 int *iarg = arg;
180
181                 dprintk(1, KERN_INFO "%s: set norm %d\n", I2C_NAME(client),
182                         *iarg);
183
184                 switch (*iarg) {
185
186                 case VIDEO_MODE_NTSC:
187                         bt856_setbit(client, 0xdc, 2, 0);
188                         break;
189
190                 case VIDEO_MODE_PAL:
191                         bt856_setbit(client, 0xdc, 2, 1);
192                         bt856_setbit(client, 0xda, 0, 0);
193                         //bt856_setbit(client, 0xda, 0, 1);
194                         break;
195
196                 default:
197                         return -EINVAL;
198
199                 }
200                 encoder->norm = *iarg;
201                 if (debug != 0)
202                         bt856_dump(client);
203         }
204                 break;
205
206         case ENCODER_SET_INPUT:
207         {
208                 int *iarg = arg;
209
210                 dprintk(1, KERN_INFO "%s: set input %d\n", I2C_NAME(client),
211                         *iarg);
212
213                 /* We only have video bus.
214                  * iarg = 0: input is from bt819
215                  * iarg = 1: input is from ZR36060 */
216
217                 switch (*iarg) {
218
219                 case 0:
220                         bt856_setbit(client, 0xde, 4, 0);
221                         bt856_setbit(client, 0xde, 3, 1);
222                         bt856_setbit(client, 0xdc, 3, 1);
223                         bt856_setbit(client, 0xdc, 6, 0);
224                         break;
225                 case 1:
226                         bt856_setbit(client, 0xde, 4, 0);
227                         bt856_setbit(client, 0xde, 3, 1);
228                         bt856_setbit(client, 0xdc, 3, 1);
229                         bt856_setbit(client, 0xdc, 6, 1);
230                         break;
231                 case 2: // Color bar
232                         bt856_setbit(client, 0xdc, 3, 0);
233                         bt856_setbit(client, 0xde, 4, 1);
234                         break;
235                 default:
236                         return -EINVAL;
237
238                 }
239
240                 if (debug != 0)
241                         bt856_dump(client);
242         }
243                 break;
244
245         case ENCODER_SET_OUTPUT:
246         {
247                 int *iarg = arg;
248
249                 dprintk(1, KERN_INFO "%s: set output %d\n", I2C_NAME(client),
250                         *iarg);
251
252                 /* not much choice of outputs */
253                 if (*iarg != 0) {
254                         return -EINVAL;
255                 }
256         }
257                 break;
258
259         case ENCODER_ENABLE_OUTPUT:
260         {
261                 int *iarg = arg;
262
263                 encoder->enable = !!*iarg;
264
265                 dprintk(1, KERN_INFO "%s: enable output %d\n",
266                         I2C_NAME(client), encoder->enable);
267         }
268                 break;
269
270         default:
271                 return -EINVAL;
272         }
273
274         return 0;
275 }
276
277 /* ----------------------------------------------------------------------- */
278
279 /*
280  * Generic i2c probe
281  * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
282  */
283 static unsigned short normal_i2c[] = { I2C_BT856 >> 1, I2C_CLIENT_END };
284
285 static unsigned short ignore = I2C_CLIENT_END;
286
287 static struct i2c_client_address_data addr_data = {
288         .normal_i2c             = normal_i2c,
289         .probe                  = &ignore,
290         .ignore                 = &ignore,
291 };
292
293 static struct i2c_driver i2c_driver_bt856;
294
295 static int
296 bt856_detect_client (struct i2c_adapter *adapter,
297                      int                 address,
298                      int                 kind)
299 {
300         int i;
301         struct i2c_client *client;
302         struct bt856 *encoder;
303
304         dprintk(1,
305                 KERN_INFO
306                 "bt856.c: detecting bt856 client on address 0x%x\n",
307                 address << 1);
308
309         /* Check if the adapter supports the needed features */
310         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
311                 return 0;
312
313         client = kzalloc(sizeof(struct i2c_client), GFP_KERNEL);
314         if (!client)
315                 return -ENOMEM;
316         client->addr = address;
317         client->adapter = adapter;
318         client->driver = &i2c_driver_bt856;
319         strlcpy(I2C_NAME(client), "bt856", sizeof(I2C_NAME(client)));
320
321         encoder = kzalloc(sizeof(struct bt856), GFP_KERNEL);
322         if (encoder == NULL) {
323                 kfree(client);
324                 return -ENOMEM;
325         }
326         encoder->norm = VIDEO_MODE_NTSC;
327         encoder->enable = 1;
328         i2c_set_clientdata(client, encoder);
329
330         i = i2c_attach_client(client);
331         if (i) {
332                 kfree(client);
333                 kfree(encoder);
334                 return i;
335         }
336
337         bt856_write(client, 0xdc, 0x18);
338         bt856_write(client, 0xda, 0);
339         bt856_write(client, 0xde, 0);
340
341         bt856_setbit(client, 0xdc, 3, 1);
342         //bt856_setbit(client, 0xdc, 6, 0);
343         bt856_setbit(client, 0xdc, 4, 1);
344
345         switch (encoder->norm) {
346
347         case VIDEO_MODE_NTSC:
348                 bt856_setbit(client, 0xdc, 2, 0);
349                 break;
350
351         case VIDEO_MODE_PAL:
352                 bt856_setbit(client, 0xdc, 2, 1);
353                 break;
354         }
355
356         bt856_setbit(client, 0xdc, 1, 1);
357         bt856_setbit(client, 0xde, 4, 0);
358         bt856_setbit(client, 0xde, 3, 1);
359
360         if (debug != 0)
361                 bt856_dump(client);
362
363         dprintk(1, KERN_INFO "%s_attach: at address 0x%x\n", I2C_NAME(client),
364                 client->addr << 1);
365
366         return 0;
367 }
368
369 static int
370 bt856_attach_adapter (struct i2c_adapter *adapter)
371 {
372         dprintk(1,
373                 KERN_INFO
374                 "bt856.c: starting probe for adapter %s (0x%x)\n",
375                 I2C_NAME(adapter), adapter->id);
376         return i2c_probe(adapter, &addr_data, &bt856_detect_client);
377 }
378
379 static int
380 bt856_detach_client (struct i2c_client *client)
381 {
382         struct bt856 *encoder = i2c_get_clientdata(client);
383         int err;
384
385         err = i2c_detach_client(client);
386         if (err) {
387                 return err;
388         }
389
390         kfree(encoder);
391         kfree(client);
392
393         return 0;
394 }
395
396 /* ----------------------------------------------------------------------- */
397
398 static struct i2c_driver i2c_driver_bt856 = {
399         .driver = {
400                 .name = "bt856",
401         },
402
403         .id = I2C_DRIVERID_BT856,
404
405         .attach_adapter = bt856_attach_adapter,
406         .detach_client = bt856_detach_client,
407         .command = bt856_command,
408 };
409
410 static int __init
411 bt856_init (void)
412 {
413         return i2c_add_driver(&i2c_driver_bt856);
414 }
415
416 static void __exit
417 bt856_exit (void)
418 {
419         i2c_del_driver(&i2c_driver_bt856);
420 }
421
422 module_init(bt856_init);
423 module_exit(bt856_exit);