deeef125eb92eca9499fac5f06a7b72f7108a8fc
[linux-2.6.git] / drivers / media / video / indycam.c
1 /*
2  *  indycam.c - Silicon Graphics IndyCam digital camera driver
3  *
4  *  Copyright (C) 2003 Ladislav Michl <ladis@linux-mips.org>
5  *  Copyright (C) 2004,2005 Mikael Nousiainen <tmnousia@cc.hut.fi>
6  *
7  *  This program is free software; you can redistribute it and/or modify
8  *  it under the terms of the GNU General Public License version 2 as
9  *  published by the Free Software Foundation.
10  */
11
12 #include <linux/delay.h>
13 #include <linux/errno.h>
14 #include <linux/fs.h>
15 #include <linux/init.h>
16 #include <linux/kernel.h>
17 #include <linux/major.h>
18 #include <linux/module.h>
19 #include <linux/mm.h>
20 #include <linux/sched.h>
21 #include <linux/slab.h>
22
23 #include <linux/videodev.h>
24 /* IndyCam decodes stream of photons into digital image representation ;-) */
25 #include <linux/video_decoder.h>
26 #include <linux/i2c.h>
27
28 #include "indycam.h"
29
30 #define INDYCAM_MODULE_VERSION "0.0.5"
31
32 MODULE_DESCRIPTION("SGI IndyCam driver");
33 MODULE_VERSION(INDYCAM_MODULE_VERSION);
34 MODULE_AUTHOR("Mikael Nousiainen <tmnousia@cc.hut.fi>");
35 MODULE_LICENSE("GPL");
36
37 // #define INDYCAM_DEBUG
38
39 #ifdef INDYCAM_DEBUG
40 #define dprintk(x...) printk("IndyCam: " x);
41 #define indycam_regdump(client) indycam_regdump_debug(client)
42 #else
43 #define dprintk(x...)
44 #define indycam_regdump(client)
45 #endif
46
47 struct indycam {
48         struct i2c_client *client;
49         u8 version;
50 };
51
52 static struct i2c_driver i2c_driver_indycam;
53
54 static const u8 initseq[] = {
55         INDYCAM_CONTROL_AGCENA,         /* INDYCAM_CONTROL */
56         INDYCAM_SHUTTER_60,             /* INDYCAM_SHUTTER */
57         INDYCAM_GAIN_DEFAULT,           /* INDYCAM_GAIN */
58         0x00,                           /* INDYCAM_BRIGHTNESS (read-only) */
59         INDYCAM_RED_BALANCE_DEFAULT,    /* INDYCAM_RED_BALANCE */
60         INDYCAM_BLUE_BALANCE_DEFAULT,   /* INDYCAM_BLUE_BALANCE */
61         INDYCAM_RED_SATURATION_DEFAULT, /* INDYCAM_RED_SATURATION */
62         INDYCAM_BLUE_SATURATION_DEFAULT,/* INDYCAM_BLUE_SATURATION */
63 };
64
65 /* IndyCam register handling */
66
67 static int indycam_read_reg(struct i2c_client *client, u8 reg, u8 *value)
68 {
69         int ret;
70
71         if (reg == INDYCAM_REG_RESET) {
72                 dprintk("indycam_read_reg(): "
73                         "skipping write-only register %d\n", reg);
74                 *value = 0;
75                 return 0;
76         }
77
78         ret = i2c_smbus_read_byte_data(client, reg);
79
80         if (ret < 0) {
81                 printk(KERN_ERR "IndyCam: indycam_read_reg(): read failed, "
82                        "register = 0x%02x\n", reg);
83                 return ret;
84         }
85
86         *value = (u8)ret;
87
88         return 0;
89 }
90
91 static int indycam_write_reg(struct i2c_client *client, u8 reg, u8 value)
92 {
93         int err;
94
95         if ((reg == INDYCAM_REG_BRIGHTNESS)
96             || (reg == INDYCAM_REG_VERSION)) {
97                 dprintk("indycam_write_reg(): "
98                         "skipping read-only register %d\n", reg);
99                 return 0;
100         }
101
102         dprintk("Writing Reg %d = 0x%02x\n", reg, value);
103         err = i2c_smbus_write_byte_data(client, reg, value);
104
105         if (err) {
106                 printk(KERN_ERR "IndyCam: indycam_write_reg(): write failed, "
107                        "register = 0x%02x, value = 0x%02x\n", reg, value);
108         }
109         return err;
110 }
111
112 static int indycam_write_block(struct i2c_client *client, u8 reg,
113                                u8 length, u8 *data)
114 {
115         int i, err;
116
117         for (i = 0; i < length; i++) {
118                 err = indycam_write_reg(client, reg + i, data[i]);
119                 if (err)
120                         return err;
121         }
122
123         return 0;
124 }
125
126 /* Helper functions */
127
128 #ifdef INDYCAM_DEBUG
129 static void indycam_regdump_debug(struct i2c_client *client)
130 {
131         int i;
132         u8 val;
133
134         for (i = 0; i < 9; i++) {
135                 indycam_read_reg(client, i, &val);
136                 dprintk("Reg %d = 0x%02x\n", i, val);
137         }
138 }
139 #endif
140
141 static int indycam_get_control(struct i2c_client *client,
142                                struct indycam_control *ctrl)
143 {
144         struct indycam *camera = i2c_get_clientdata(client);
145         u8 reg;
146         int ret = 0;
147
148         switch (ctrl->type) {
149         case INDYCAM_CONTROL_AGC:
150         case INDYCAM_CONTROL_AWB:
151                 ret = indycam_read_reg(client, INDYCAM_REG_CONTROL, &reg);
152                 if (ret)
153                         return -EIO;
154                 if (ctrl->type == INDYCAM_CONTROL_AGC)
155                         ctrl->value = (reg & INDYCAM_CONTROL_AGCENA)
156                                 ? 1 : 0;
157                 else
158                         ctrl->value = (reg & INDYCAM_CONTROL_AWBCTL)
159                                 ? 1 : 0;
160                 break;
161         case INDYCAM_CONTROL_SHUTTER:
162                 ret = indycam_read_reg(client, INDYCAM_REG_SHUTTER, &reg);
163                 if (ret)
164                         return -EIO;
165                 ctrl->value = ((s32)reg == 0x00) ? 0xff : ((s32)reg - 1);
166                 break;
167         case INDYCAM_CONTROL_GAIN:
168                 ret = indycam_read_reg(client, INDYCAM_REG_GAIN, &reg);
169                 if (ret)
170                         return -EIO;
171                 ctrl->value = (s32)reg;
172                 break;
173         case INDYCAM_CONTROL_RED_BALANCE:
174                 ret = indycam_read_reg(client, INDYCAM_REG_RED_BALANCE, &reg);
175                 if (ret)
176                         return -EIO;
177                 ctrl->value = (s32)reg;
178                 break;
179         case INDYCAM_CONTROL_BLUE_BALANCE:
180                 ret = indycam_read_reg(client, INDYCAM_REG_BLUE_BALANCE, &reg);
181                 if (ret)
182                         return -EIO;
183                 ctrl->value = (s32)reg;
184                 break;
185         case INDYCAM_CONTROL_RED_SATURATION:
186                 ret = indycam_read_reg(client,
187                                        INDYCAM_REG_RED_SATURATION, &reg);
188                 if (ret)
189                         return -EIO;
190                 ctrl->value = (s32)reg;
191                 break;
192         case INDYCAM_CONTROL_BLUE_SATURATION:
193                 ret = indycam_read_reg(client,
194                                        INDYCAM_REG_BLUE_SATURATION, &reg);
195                 if (ret)
196                         return -EIO;
197                 ctrl->value = (s32)reg;
198                 break;
199         case INDYCAM_CONTROL_GAMMA:
200                 if (camera->version == CAMERA_VERSION_MOOSE) {
201                         ret = indycam_read_reg(client,
202                                                INDYCAM_REG_GAMMA, &reg);
203                         if (ret)
204                                 return -EIO;
205                         ctrl->value = (s32)reg;
206                 } else {
207                         ctrl->value = INDYCAM_GAMMA_DEFAULT;
208                 }
209                 break;
210         default:
211                 ret = -EINVAL;
212         }
213
214         return ret;
215 }
216
217 static int indycam_set_control(struct i2c_client *client,
218                                struct indycam_control *ctrl)
219 {
220         struct indycam *camera = i2c_get_clientdata(client);
221         u8 reg;
222         int ret = 0;
223
224         switch (ctrl->type) {
225         case INDYCAM_CONTROL_AGC:
226         case INDYCAM_CONTROL_AWB:
227                 ret = indycam_read_reg(client, INDYCAM_REG_CONTROL, &reg);
228                 if (ret)
229                         break;
230
231                 if (ctrl->type == INDYCAM_CONTROL_AGC) {
232                         if (ctrl->value)
233                                 reg |= INDYCAM_CONTROL_AGCENA;
234                         else
235                                 reg &= ~INDYCAM_CONTROL_AGCENA;
236                 } else {
237                         if (ctrl->value)
238                                 reg |= INDYCAM_CONTROL_AWBCTL;
239                         else
240                                 reg &= ~INDYCAM_CONTROL_AWBCTL;
241                 }
242
243                 ret = indycam_write_reg(client, INDYCAM_REG_CONTROL, reg);
244                 break;
245         case INDYCAM_CONTROL_SHUTTER:
246                 reg = (ctrl->value == 0xff) ? 0x00 : (ctrl->value + 1);
247                 ret = indycam_write_reg(client, INDYCAM_REG_SHUTTER, reg);
248                 break;
249         case INDYCAM_CONTROL_GAIN:
250                 ret = indycam_write_reg(client, INDYCAM_REG_GAIN, ctrl->value);
251                 break;
252         case INDYCAM_CONTROL_RED_BALANCE:
253                 ret = indycam_write_reg(client, INDYCAM_REG_RED_BALANCE,
254                                         ctrl->value);
255                 break;
256         case INDYCAM_CONTROL_BLUE_BALANCE:
257                 ret = indycam_write_reg(client, INDYCAM_REG_BLUE_BALANCE,
258                                         ctrl->value);
259                 break;
260         case INDYCAM_CONTROL_RED_SATURATION:
261                 ret = indycam_write_reg(client, INDYCAM_REG_RED_SATURATION,
262                                         ctrl->value);
263                 break;
264         case INDYCAM_CONTROL_BLUE_SATURATION:
265                 ret = indycam_write_reg(client, INDYCAM_REG_BLUE_SATURATION,
266                                         ctrl->value);
267                 break;
268         case INDYCAM_CONTROL_GAMMA:
269                 if (camera->version == CAMERA_VERSION_MOOSE) {
270                         ret = indycam_write_reg(client, INDYCAM_REG_GAMMA,
271                                                 ctrl->value);
272                 }
273                 break;
274         default:
275                 ret = -EINVAL;
276         }
277
278         return ret;
279 }
280
281 /* I2C-interface */
282
283 static int indycam_attach(struct i2c_adapter *adap, int addr, int kind)
284 {
285         int err = 0;
286         struct indycam *camera;
287         struct i2c_client *client;
288
289         printk(KERN_INFO "SGI IndyCam driver version %s\n",
290                INDYCAM_MODULE_VERSION);
291
292         client = kmalloc(sizeof(struct i2c_client), GFP_KERNEL);
293         if (!client)
294                 return -ENOMEM;
295         camera = kmalloc(sizeof(struct indycam), GFP_KERNEL);
296         if (!camera) {
297                 err = -ENOMEM;
298                 goto out_free_client;
299         }
300
301         memset(client, 0, sizeof(struct i2c_client));
302         memset(camera, 0, sizeof(struct indycam));
303
304         client->addr = addr;
305         client->adapter = adap;
306         client->driver = &i2c_driver_indycam;
307         client->flags = 0;
308         strcpy(client->name, "IndyCam client");
309         i2c_set_clientdata(client, camera);
310
311         camera->client = client;
312
313         err = i2c_attach_client(client);
314         if (err)
315                 goto out_free_camera;
316
317         camera->version = i2c_smbus_read_byte_data(client,
318                                                    INDYCAM_REG_VERSION);
319         if (camera->version != CAMERA_VERSION_INDY &&
320             camera->version != CAMERA_VERSION_MOOSE) {
321                 err = -ENODEV;
322                 goto out_detach_client;
323         }
324         printk(KERN_INFO "IndyCam v%d.%d detected\n",
325                INDYCAM_VERSION_MAJOR(camera->version),
326                INDYCAM_VERSION_MINOR(camera->version));
327
328         indycam_regdump(client);
329
330         // initialize
331         err = indycam_write_block(client, 0, sizeof(initseq), (u8 *)&initseq);
332         if (err) {
333                 printk(KERN_ERR "IndyCam initalization failed\n");
334                 err = -EIO;
335                 goto out_detach_client;
336         }
337
338         indycam_regdump(client);
339
340         // white balance
341         err = indycam_write_reg(client, INDYCAM_REG_CONTROL,
342                           INDYCAM_CONTROL_AGCENA | INDYCAM_CONTROL_AWBCTL);
343         if (err) {
344                 printk(KERN_ERR "IndyCam: White balancing camera failed\n");
345                 err = -EIO;
346                 goto out_detach_client;
347         }
348
349         indycam_regdump(client);
350
351         printk(KERN_INFO "IndyCam initialized\n");
352
353         return 0;
354
355 out_detach_client:
356         i2c_detach_client(client);
357 out_free_camera:
358         kfree(camera);
359 out_free_client:
360         kfree(client);
361         return err;
362 }
363
364 static int indycam_probe(struct i2c_adapter *adap)
365 {
366         /* Indy specific crap */
367         if (adap->id == I2C_HW_SGI_VINO)
368                 return indycam_attach(adap, INDYCAM_ADDR, 0);
369         /* Feel free to add probe here :-) */
370         return -ENODEV;
371 }
372
373 static int indycam_detach(struct i2c_client *client)
374 {
375         struct indycam *camera = i2c_get_clientdata(client);
376
377         i2c_detach_client(client);
378         kfree(camera);
379         kfree(client);
380         return 0;
381 }
382
383 static int indycam_command(struct i2c_client *client, unsigned int cmd,
384                            void *arg)
385 {
386         // struct indycam *camera = i2c_get_clientdata(client);
387
388         /* The old video_decoder interface just isn't enough,
389          * so we'll use some custom commands. */
390         switch (cmd) {
391         case DECODER_GET_CAPABILITIES: {
392                 struct video_decoder_capability *cap = arg;
393
394                 cap->flags  = VIDEO_DECODER_NTSC;
395                 cap->inputs = 1;
396                 cap->outputs = 1;
397                 break;
398         }
399         case DECODER_GET_STATUS: {
400                 int *iarg = arg;
401
402                 *iarg = DECODER_STATUS_GOOD | DECODER_STATUS_NTSC |
403                         DECODER_STATUS_COLOR;
404                 break;
405         }
406         case DECODER_SET_NORM: {
407                 int *iarg = arg;
408
409                 switch (*iarg) {
410                 case VIDEO_MODE_NTSC:
411                         break;
412                 default:
413                         return -EINVAL;
414                 }
415                 break;
416         }
417         case DECODER_SET_INPUT: {
418                 int *iarg = arg;
419
420                 if (*iarg != 0)
421                         return -EINVAL;
422                 break;
423         }
424         case DECODER_SET_OUTPUT: {
425                 int *iarg = arg;
426
427                 if (*iarg != 0)
428                         return -EINVAL;
429                 break;
430         }
431         case DECODER_ENABLE_OUTPUT: {
432                 /* Always enabled */
433                 break;
434         }
435         case DECODER_SET_PICTURE: {
436                 // struct video_picture *pic = arg;
437                 /* TODO: convert values for indycam_set_controls() */
438                 break;
439         }
440         case DECODER_INDYCAM_GET_CONTROL: {
441                 return indycam_get_control(client, arg);
442         }
443         case DECODER_INDYCAM_SET_CONTROL: {
444                 return indycam_set_control(client, arg);
445         }
446         default:
447                 return -EINVAL;
448         }
449
450         return 0;
451 }
452
453 static struct i2c_driver i2c_driver_indycam = {
454         .owner          = THIS_MODULE,
455         .name           = "indycam",
456         .id             = I2C_DRIVERID_INDYCAM,
457         .flags          = I2C_DF_NOTIFY,
458         .attach_adapter = indycam_probe,
459         .detach_client  = indycam_detach,
460         .command        = indycam_command,
461 };
462
463 static int __init indycam_init(void)
464 {
465         return i2c_add_driver(&i2c_driver_indycam);
466 }
467
468 static void __exit indycam_exit(void)
469 {
470         i2c_del_driver(&i2c_driver_indycam);
471 }
472
473 module_init(indycam_init);
474 module_exit(indycam_exit);