[media] marvell-cam: Basic working MMP camera driver
[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/slab.h>
21
22 /* IndyCam decodes stream of photons into digital image representation ;-) */
23 #include <linux/videodev2.h>
24 #include <linux/i2c.h>
25 #include <media/v4l2-device.h>
26 #include <media/v4l2-chip-ident.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
38 // #define INDYCAM_DEBUG
39
40 #ifdef INDYCAM_DEBUG
41 #define dprintk(x...) printk("IndyCam: " x);
42 #define indycam_regdump(client) indycam_regdump_debug(client)
43 #else
44 #define dprintk(x...)
45 #define indycam_regdump(client)
46 #endif
47
48 struct indycam {
49         struct v4l2_subdev sd;
50         u8 version;
51 };
52
53 static inline struct indycam *to_indycam(struct v4l2_subdev *sd)
54 {
55         return container_of(sd, struct indycam, sd);
56 }
57
58 static const u8 initseq[] = {
59         INDYCAM_CONTROL_AGCENA,         /* INDYCAM_CONTROL */
60         INDYCAM_SHUTTER_60,             /* INDYCAM_SHUTTER */
61         INDYCAM_GAIN_DEFAULT,           /* INDYCAM_GAIN */
62         0x00,                           /* INDYCAM_BRIGHTNESS (read-only) */
63         INDYCAM_RED_BALANCE_DEFAULT,    /* INDYCAM_RED_BALANCE */
64         INDYCAM_BLUE_BALANCE_DEFAULT,   /* INDYCAM_BLUE_BALANCE */
65         INDYCAM_RED_SATURATION_DEFAULT, /* INDYCAM_RED_SATURATION */
66         INDYCAM_BLUE_SATURATION_DEFAULT,/* INDYCAM_BLUE_SATURATION */
67 };
68
69 /* IndyCam register handling */
70
71 static int indycam_read_reg(struct v4l2_subdev *sd, u8 reg, u8 *value)
72 {
73         struct i2c_client *client = v4l2_get_subdevdata(sd);
74         int ret;
75
76         if (reg == INDYCAM_REG_RESET) {
77                 dprintk("indycam_read_reg(): "
78                         "skipping write-only register %d\n", reg);
79                 *value = 0;
80                 return 0;
81         }
82
83         ret = i2c_smbus_read_byte_data(client, reg);
84
85         if (ret < 0) {
86                 printk(KERN_ERR "IndyCam: indycam_read_reg(): read failed, "
87                        "register = 0x%02x\n", reg);
88                 return ret;
89         }
90
91         *value = (u8)ret;
92
93         return 0;
94 }
95
96 static int indycam_write_reg(struct v4l2_subdev *sd, u8 reg, u8 value)
97 {
98         struct i2c_client *client = v4l2_get_subdevdata(sd);
99         int err;
100
101         if (reg == INDYCAM_REG_BRIGHTNESS || reg == INDYCAM_REG_VERSION) {
102                 dprintk("indycam_write_reg(): "
103                         "skipping read-only register %d\n", reg);
104                 return 0;
105         }
106
107         dprintk("Writing Reg %d = 0x%02x\n", reg, value);
108         err = i2c_smbus_write_byte_data(client, reg, value);
109
110         if (err) {
111                 printk(KERN_ERR "IndyCam: indycam_write_reg(): write failed, "
112                        "register = 0x%02x, value = 0x%02x\n", reg, value);
113         }
114         return err;
115 }
116
117 static int indycam_write_block(struct v4l2_subdev *sd, u8 reg,
118                                u8 length, u8 *data)
119 {
120         int i, err;
121
122         for (i = 0; i < length; i++) {
123                 err = indycam_write_reg(sd, reg + i, data[i]);
124                 if (err)
125                         return err;
126         }
127
128         return 0;
129 }
130
131 /* Helper functions */
132
133 #ifdef INDYCAM_DEBUG
134 static void indycam_regdump_debug(struct v4l2_subdev *sd)
135 {
136         int i;
137         u8 val;
138
139         for (i = 0; i < 9; i++) {
140                 indycam_read_reg(sd, i, &val);
141                 dprintk("Reg %d = 0x%02x\n", i, val);
142         }
143 }
144 #endif
145
146 static int indycam_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
147 {
148         struct indycam *camera = to_indycam(sd);
149         u8 reg;
150         int ret = 0;
151
152         switch (ctrl->id) {
153         case V4L2_CID_AUTOGAIN:
154         case V4L2_CID_AUTO_WHITE_BALANCE:
155                 ret = indycam_read_reg(sd, INDYCAM_REG_CONTROL, &reg);
156                 if (ret)
157                         return -EIO;
158                 if (ctrl->id == V4L2_CID_AUTOGAIN)
159                         ctrl->value = (reg & INDYCAM_CONTROL_AGCENA)
160                                 ? 1 : 0;
161                 else
162                         ctrl->value = (reg & INDYCAM_CONTROL_AWBCTL)
163                                 ? 1 : 0;
164                 break;
165         case V4L2_CID_EXPOSURE:
166                 ret = indycam_read_reg(sd, INDYCAM_REG_SHUTTER, &reg);
167                 if (ret)
168                         return -EIO;
169                 ctrl->value = ((s32)reg == 0x00) ? 0xff : ((s32)reg - 1);
170                 break;
171         case V4L2_CID_GAIN:
172                 ret = indycam_read_reg(sd, INDYCAM_REG_GAIN, &reg);
173                 if (ret)
174                         return -EIO;
175                 ctrl->value = (s32)reg;
176                 break;
177         case V4L2_CID_RED_BALANCE:
178                 ret = indycam_read_reg(sd, INDYCAM_REG_RED_BALANCE, &reg);
179                 if (ret)
180                         return -EIO;
181                 ctrl->value = (s32)reg;
182                 break;
183         case V4L2_CID_BLUE_BALANCE:
184                 ret = indycam_read_reg(sd, INDYCAM_REG_BLUE_BALANCE, &reg);
185                 if (ret)
186                         return -EIO;
187                 ctrl->value = (s32)reg;
188                 break;
189         case INDYCAM_CONTROL_RED_SATURATION:
190                 ret = indycam_read_reg(sd,
191                                        INDYCAM_REG_RED_SATURATION, &reg);
192                 if (ret)
193                         return -EIO;
194                 ctrl->value = (s32)reg;
195                 break;
196         case INDYCAM_CONTROL_BLUE_SATURATION:
197                 ret = indycam_read_reg(sd,
198                                        INDYCAM_REG_BLUE_SATURATION, &reg);
199                 if (ret)
200                         return -EIO;
201                 ctrl->value = (s32)reg;
202                 break;
203         case V4L2_CID_GAMMA:
204                 if (camera->version == CAMERA_VERSION_MOOSE) {
205                         ret = indycam_read_reg(sd,
206                                                INDYCAM_REG_GAMMA, &reg);
207                         if (ret)
208                                 return -EIO;
209                         ctrl->value = (s32)reg;
210                 } else {
211                         ctrl->value = INDYCAM_GAMMA_DEFAULT;
212                 }
213                 break;
214         default:
215                 ret = -EINVAL;
216         }
217
218         return ret;
219 }
220
221 static int indycam_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
222 {
223         struct indycam *camera = to_indycam(sd);
224         u8 reg;
225         int ret = 0;
226
227         switch (ctrl->id) {
228         case V4L2_CID_AUTOGAIN:
229         case V4L2_CID_AUTO_WHITE_BALANCE:
230                 ret = indycam_read_reg(sd, INDYCAM_REG_CONTROL, &reg);
231                 if (ret)
232                         break;
233
234                 if (ctrl->id == V4L2_CID_AUTOGAIN) {
235                         if (ctrl->value)
236                                 reg |= INDYCAM_CONTROL_AGCENA;
237                         else
238                                 reg &= ~INDYCAM_CONTROL_AGCENA;
239                 } else {
240                         if (ctrl->value)
241                                 reg |= INDYCAM_CONTROL_AWBCTL;
242                         else
243                                 reg &= ~INDYCAM_CONTROL_AWBCTL;
244                 }
245
246                 ret = indycam_write_reg(sd, INDYCAM_REG_CONTROL, reg);
247                 break;
248         case V4L2_CID_EXPOSURE:
249                 reg = (ctrl->value == 0xff) ? 0x00 : (ctrl->value + 1);
250                 ret = indycam_write_reg(sd, INDYCAM_REG_SHUTTER, reg);
251                 break;
252         case V4L2_CID_GAIN:
253                 ret = indycam_write_reg(sd, INDYCAM_REG_GAIN, ctrl->value);
254                 break;
255         case V4L2_CID_RED_BALANCE:
256                 ret = indycam_write_reg(sd, INDYCAM_REG_RED_BALANCE,
257                                         ctrl->value);
258                 break;
259         case V4L2_CID_BLUE_BALANCE:
260                 ret = indycam_write_reg(sd, INDYCAM_REG_BLUE_BALANCE,
261                                         ctrl->value);
262                 break;
263         case INDYCAM_CONTROL_RED_SATURATION:
264                 ret = indycam_write_reg(sd, INDYCAM_REG_RED_SATURATION,
265                                         ctrl->value);
266                 break;
267         case INDYCAM_CONTROL_BLUE_SATURATION:
268                 ret = indycam_write_reg(sd, INDYCAM_REG_BLUE_SATURATION,
269                                         ctrl->value);
270                 break;
271         case V4L2_CID_GAMMA:
272                 if (camera->version == CAMERA_VERSION_MOOSE) {
273                         ret = indycam_write_reg(sd, INDYCAM_REG_GAMMA,
274                                                 ctrl->value);
275                 }
276                 break;
277         default:
278                 ret = -EINVAL;
279         }
280
281         return ret;
282 }
283
284 /* I2C-interface */
285
286 static int indycam_g_chip_ident(struct v4l2_subdev *sd,
287                 struct v4l2_dbg_chip_ident *chip)
288 {
289         struct i2c_client *client = v4l2_get_subdevdata(sd);
290         struct indycam *camera = to_indycam(sd);
291
292         return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_INDYCAM,
293                        camera->version);
294 }
295
296 /* ----------------------------------------------------------------------- */
297
298 static const struct v4l2_subdev_core_ops indycam_core_ops = {
299         .g_chip_ident = indycam_g_chip_ident,
300         .g_ctrl = indycam_g_ctrl,
301         .s_ctrl = indycam_s_ctrl,
302 };
303
304 static const struct v4l2_subdev_ops indycam_ops = {
305         .core = &indycam_core_ops,
306 };
307
308 static int indycam_probe(struct i2c_client *client,
309                           const struct i2c_device_id *id)
310 {
311         int err = 0;
312         struct indycam *camera;
313         struct v4l2_subdev *sd;
314
315         v4l_info(client, "chip found @ 0x%x (%s)\n",
316                         client->addr << 1, client->adapter->name);
317
318         camera = kzalloc(sizeof(struct indycam), GFP_KERNEL);
319         if (!camera)
320                 return -ENOMEM;
321
322         sd = &camera->sd;
323         v4l2_i2c_subdev_init(sd, client, &indycam_ops);
324
325         camera->version = i2c_smbus_read_byte_data(client,
326                                                    INDYCAM_REG_VERSION);
327         if (camera->version != CAMERA_VERSION_INDY &&
328             camera->version != CAMERA_VERSION_MOOSE) {
329                 kfree(camera);
330                 return -ENODEV;
331         }
332
333         printk(KERN_INFO "IndyCam v%d.%d detected\n",
334                INDYCAM_VERSION_MAJOR(camera->version),
335                INDYCAM_VERSION_MINOR(camera->version));
336
337         indycam_regdump(sd);
338
339         // initialize
340         err = indycam_write_block(sd, 0, sizeof(initseq), (u8 *)&initseq);
341         if (err) {
342                 printk(KERN_ERR "IndyCam initialization failed\n");
343                 kfree(camera);
344                 return -EIO;
345         }
346
347         indycam_regdump(sd);
348
349         // white balance
350         err = indycam_write_reg(sd, INDYCAM_REG_CONTROL,
351                           INDYCAM_CONTROL_AGCENA | INDYCAM_CONTROL_AWBCTL);
352         if (err) {
353                 printk(KERN_ERR "IndyCam: White balancing camera failed\n");
354                 kfree(camera);
355                 return -EIO;
356         }
357
358         indycam_regdump(sd);
359
360         printk(KERN_INFO "IndyCam initialized\n");
361
362         return 0;
363 }
364
365 static int indycam_remove(struct i2c_client *client)
366 {
367         struct v4l2_subdev *sd = i2c_get_clientdata(client);
368
369         v4l2_device_unregister_subdev(sd);
370         kfree(to_indycam(sd));
371         return 0;
372 }
373
374 static const struct i2c_device_id indycam_id[] = {
375         { "indycam", 0 },
376         { }
377 };
378 MODULE_DEVICE_TABLE(i2c, indycam_id);
379
380 static struct i2c_driver indycam_driver = {
381         .driver = {
382                 .owner  = THIS_MODULE,
383                 .name   = "indycam",
384         },
385         .probe          = indycam_probe,
386         .remove         = indycam_remove,
387         .id_table       = indycam_id,
388 };
389
390 static __init int init_indycam(void)
391 {
392         return i2c_add_driver(&indycam_driver);
393 }
394
395 static __exit void exit_indycam(void)
396 {
397         i2c_del_driver(&indycam_driver);
398 }
399
400 module_init(init_indycam);
401 module_exit(exit_indycam);