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 #include <media/v4l2-i2c-drv.h>
28
29 #include "indycam.h"
30
31 #define INDYCAM_MODULE_VERSION "0.0.5"
32
33 MODULE_DESCRIPTION("SGI IndyCam driver");
34 MODULE_VERSION(INDYCAM_MODULE_VERSION);
35 MODULE_AUTHOR("Mikael Nousiainen <tmnousia@cc.hut.fi>");
36 MODULE_LICENSE("GPL");
37
38
39 // #define INDYCAM_DEBUG
40
41 #ifdef INDYCAM_DEBUG
42 #define dprintk(x...) printk("IndyCam: " x);
43 #define indycam_regdump(client) indycam_regdump_debug(client)
44 #else
45 #define dprintk(x...)
46 #define indycam_regdump(client)
47 #endif
48
49 struct indycam {
50 struct v4l2_subdev sd;
51 u8 version;
52 };
53
54 static inline struct indycam *to_indycam(struct v4l2_subdev *sd)
55 {
56 return container_of(sd, struct indycam, sd);
57 }
58
59 static const u8 initseq[] = {
60 INDYCAM_CONTROL_AGCENA, /* INDYCAM_CONTROL */
61 INDYCAM_SHUTTER_60, /* INDYCAM_SHUTTER */
62 INDYCAM_GAIN_DEFAULT, /* INDYCAM_GAIN */
63 0x00, /* INDYCAM_BRIGHTNESS (read-only) */
64 INDYCAM_RED_BALANCE_DEFAULT, /* INDYCAM_RED_BALANCE */
65 INDYCAM_BLUE_BALANCE_DEFAULT, /* INDYCAM_BLUE_BALANCE */
66 INDYCAM_RED_SATURATION_DEFAULT, /* INDYCAM_RED_SATURATION */
67 INDYCAM_BLUE_SATURATION_DEFAULT,/* INDYCAM_BLUE_SATURATION */
68 };
69
70 /* IndyCam register handling */
71
72 static int indycam_read_reg(struct v4l2_subdev *sd, u8 reg, u8 *value)
73 {
74 struct i2c_client *client = v4l2_get_subdevdata(sd);
75 int ret;
76
77 if (reg == INDYCAM_REG_RESET) {
78 dprintk("indycam_read_reg(): "
79 "skipping write-only register %d\n", reg);
80 *value = 0;
81 return 0;
82 }
83
84 ret = i2c_smbus_read_byte_data(client, reg);
85
86 if (ret < 0) {
87 printk(KERN_ERR "IndyCam: indycam_read_reg(): read failed, "
88 "register = 0x%02x\n", reg);
89 return ret;
90 }
91
92 *value = (u8)ret;
93
94 return 0;
95 }
96
97 static int indycam_write_reg(struct v4l2_subdev *sd, u8 reg, u8 value)
98 {
99 struct i2c_client *client = v4l2_get_subdevdata(sd);
100 int err;
101
102 if (reg == INDYCAM_REG_BRIGHTNESS || reg == INDYCAM_REG_VERSION) {
103 dprintk("indycam_write_reg(): "
104 "skipping read-only register %d\n", reg);
105 return 0;
106 }
107
108 dprintk("Writing Reg %d = 0x%02x\n", reg, value);
109 err = i2c_smbus_write_byte_data(client, reg, value);
110
111 if (err) {
112 printk(KERN_ERR "IndyCam: indycam_write_reg(): write failed, "
113 "register = 0x%02x, value = 0x%02x\n", reg, value);
114 }
115 return err;
116 }
117
118 static int indycam_write_block(struct v4l2_subdev *sd, u8 reg,
119 u8 length, u8 *data)
120 {
121 int i, err;
122
123 for (i = 0; i < length; i++) {
124 err = indycam_write_reg(sd, reg + i, data[i]);
125 if (err)
126 return err;
127 }
128
129 return 0;
130 }
131
132 /* Helper functions */
133
134 #ifdef INDYCAM_DEBUG
135 static void indycam_regdump_debug(struct v4l2_subdev *sd)
136 {
137 int i;
138 u8 val;
139
140 for (i = 0; i < 9; i++) {
141 indycam_read_reg(sd, i, &val);
142 dprintk("Reg %d = 0x%02x\n", i, val);
143 }
144 }
145 #endif
146
147 static int indycam_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
148 {
149 struct indycam *camera = to_indycam(sd);
150 u8 reg;
151 int ret = 0;
152
153 switch (ctrl->id) {
154 case V4L2_CID_AUTOGAIN:
155 case V4L2_CID_AUTO_WHITE_BALANCE:
156 ret = indycam_read_reg(sd, INDYCAM_REG_CONTROL, ®);
157 if (ret)
158 return -EIO;
159 if (ctrl->id == V4L2_CID_AUTOGAIN)
160 ctrl->value = (reg & INDYCAM_CONTROL_AGCENA)
161 ? 1 : 0;
162 else
163 ctrl->value = (reg & INDYCAM_CONTROL_AWBCTL)
164 ? 1 : 0;
165 break;
166 case V4L2_CID_EXPOSURE:
167 ret = indycam_read_reg(sd, INDYCAM_REG_SHUTTER, ®);
168 if (ret)
169 return -EIO;
170 ctrl->value = ((s32)reg == 0x00) ? 0xff : ((s32)reg - 1);
171 break;
172 case V4L2_CID_GAIN:
173 ret = indycam_read_reg(sd, INDYCAM_REG_GAIN, ®);
174 if (ret)
175 return -EIO;
176 ctrl->value = (s32)reg;
177 break;
178 case V4L2_CID_RED_BALANCE:
179 ret = indycam_read_reg(sd, INDYCAM_REG_RED_BALANCE, ®);
180 if (ret)
181 return -EIO;
182 ctrl->value = (s32)reg;
183 break;
184 case V4L2_CID_BLUE_BALANCE:
185 ret = indycam_read_reg(sd, INDYCAM_REG_BLUE_BALANCE, ®);
186 if (ret)
187 return -EIO;
188 ctrl->value = (s32)reg;
189 break;
190 case INDYCAM_CONTROL_RED_SATURATION:
191 ret = indycam_read_reg(sd,
192 INDYCAM_REG_RED_SATURATION, ®);
193 if (ret)
194 return -EIO;
195 ctrl->value = (s32)reg;
196 break;
197 case INDYCAM_CONTROL_BLUE_SATURATION:
198 ret = indycam_read_reg(sd,
199 INDYCAM_REG_BLUE_SATURATION, ®);
200 if (ret)
201 return -EIO;
202 ctrl->value = (s32)reg;
203 break;
204 case V4L2_CID_GAMMA:
205 if (camera->version == CAMERA_VERSION_MOOSE) {
206 ret = indycam_read_reg(sd,
207 INDYCAM_REG_GAMMA, ®);
208 if (ret)
209 return -EIO;
210 ctrl->value = (s32)reg;
211 } else {
212 ctrl->value = INDYCAM_GAMMA_DEFAULT;
213 }
214 break;
215 default:
216 ret = -EINVAL;
217 }
218
219 return ret;
220 }
221
222 static int indycam_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
223 {
224 struct indycam *camera = to_indycam(sd);
225 u8 reg;
226 int ret = 0;
227
228 switch (ctrl->id) {
229 case V4L2_CID_AUTOGAIN:
230 case V4L2_CID_AUTO_WHITE_BALANCE:
231 ret = indycam_read_reg(sd, INDYCAM_REG_CONTROL, ®);
232 if (ret)
233 break;
234
235 if (ctrl->id == V4L2_CID_AUTOGAIN) {
236 if (ctrl->value)
237 reg |= INDYCAM_CONTROL_AGCENA;
238 else
239 reg &= ~INDYCAM_CONTROL_AGCENA;
240 } else {
241 if (ctrl->value)
242 reg |= INDYCAM_CONTROL_AWBCTL;
243 else
244 reg &= ~INDYCAM_CONTROL_AWBCTL;
245 }
246
247 ret = indycam_write_reg(sd, INDYCAM_REG_CONTROL, reg);
248 break;
249 case V4L2_CID_EXPOSURE:
250 reg = (ctrl->value == 0xff) ? 0x00 : (ctrl->value + 1);
251 ret = indycam_write_reg(sd, INDYCAM_REG_SHUTTER, reg);
252 break;
253 case V4L2_CID_GAIN:
254 ret = indycam_write_reg(sd, INDYCAM_REG_GAIN, ctrl->value);
255 break;
256 case V4L2_CID_RED_BALANCE:
257 ret = indycam_write_reg(sd, INDYCAM_REG_RED_BALANCE,
258 ctrl->value);
259 break;
260 case V4L2_CID_BLUE_BALANCE:
261 ret = indycam_write_reg(sd, INDYCAM_REG_BLUE_BALANCE,
262 ctrl->value);
263 break;
264 case INDYCAM_CONTROL_RED_SATURATION:
265 ret = indycam_write_reg(sd, INDYCAM_REG_RED_SATURATION,
266 ctrl->value);
267 break;
268 case INDYCAM_CONTROL_BLUE_SATURATION:
269 ret = indycam_write_reg(sd, INDYCAM_REG_BLUE_SATURATION,
270 ctrl->value);
271 break;
272 case V4L2_CID_GAMMA:
273 if (camera->version == CAMERA_VERSION_MOOSE) {
274 ret = indycam_write_reg(sd, INDYCAM_REG_GAMMA,
275 ctrl->value);
276 }
277 break;
278 default:
279 ret = -EINVAL;
280 }
281
282 return ret;
283 }
284
285 /* I2C-interface */
286
287 static int indycam_g_chip_ident(struct v4l2_subdev *sd,
288 struct v4l2_dbg_chip_ident *chip)
289 {
290 struct i2c_client *client = v4l2_get_subdevdata(sd);
291 struct indycam *camera = to_indycam(sd);
292
293 return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_INDYCAM,
294 camera->version);
295 }
296
297 /* ----------------------------------------------------------------------- */
298
299 static const struct v4l2_subdev_core_ops indycam_core_ops = {
300 .g_chip_ident = indycam_g_chip_ident,
301 .g_ctrl = indycam_g_ctrl,
302 .s_ctrl = indycam_s_ctrl,
303 };
304
305 static const struct v4l2_subdev_ops indycam_ops = {
306 .core = &indycam_core_ops,
307 };
308
309 static int indycam_probe(struct i2c_client *client,
310 const struct i2c_device_id *id)
311 {
312 int err = 0;
313 struct indycam *camera;
314 struct v4l2_subdev *sd;
315
316 v4l_info(client, "chip found @ 0x%x (%s)\n",
317 client->addr << 1, client->adapter->name);
318
319 camera = kzalloc(sizeof(struct indycam), GFP_KERNEL);
320 if (!camera)
321 return -ENOMEM;
322
323 sd = &camera->sd;
324 v4l2_i2c_subdev_init(sd, client, &indycam_ops);
325
326 camera->version = i2c_smbus_read_byte_data(client,
327 INDYCAM_REG_VERSION);
328 if (camera->version != CAMERA_VERSION_INDY &&
329 camera->version != CAMERA_VERSION_MOOSE) {
330 kfree(camera);
331 return -ENODEV;
332 }
333
334 printk(KERN_INFO "IndyCam v%d.%d detected\n",
335 INDYCAM_VERSION_MAJOR(camera->version),
336 INDYCAM_VERSION_MINOR(camera->version));
337
338 indycam_regdump(sd);
339
340 // initialize
341 err = indycam_write_block(sd, 0, sizeof(initseq), (u8 *)&initseq);
342 if (err) {
343 printk(KERN_ERR "IndyCam initialization failed\n");
344 kfree(camera);
345 return -EIO;
346 }
347
348 indycam_regdump(sd);
349
350 // white balance
351 err = indycam_write_reg(sd, INDYCAM_REG_CONTROL,
352 INDYCAM_CONTROL_AGCENA | INDYCAM_CONTROL_AWBCTL);
353 if (err) {
354 printk(KERN_ERR "IndyCam: White balancing camera failed\n");
355 kfree(camera);
356 return -EIO;
357 }
358
359 indycam_regdump(sd);
360
361 printk(KERN_INFO "IndyCam initialized\n");
362
363 return 0;
364 }
365
366 static int indycam_remove(struct i2c_client *client)
367 {
368 struct v4l2_subdev *sd = i2c_get_clientdata(client);
369
370 v4l2_device_unregister_subdev(sd);
371 kfree(to_indycam(sd));
372 return 0;
373 }
374
375 static const struct i2c_device_id indycam_id[] = {
376 { "indycam", 0 },
377 { }
378 };
379 MODULE_DEVICE_TABLE(i2c, indycam_id);
380
381 static struct v4l2_i2c_driver_data v4l2_i2c_data = {
382 .name = "indycam",
383 .probe = indycam_probe,
384 .remove = indycam_remove,
385 .id_table = indycam_id,
386 };
387
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