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
to_indycam(struct v4l2_subdev * sd)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
indycam_read_reg(struct v4l2_subdev * sd,u8 reg,u8 * value)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
indycam_write_reg(struct v4l2_subdev * sd,u8 reg,u8 value)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
indycam_write_block(struct v4l2_subdev * sd,u8 reg,u8 length,u8 * data)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
indycam_regdump_debug(struct v4l2_subdev * sd)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
indycam_g_ctrl(struct v4l2_subdev * sd,struct v4l2_control * ctrl)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, ®);
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, ®);
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, ®);
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, ®);
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, ®);
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, ®);
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, ®);
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, ®);
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
indycam_s_ctrl(struct v4l2_subdev * sd,struct v4l2_control * ctrl)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, ®);
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
indycam_g_chip_ident(struct v4l2_subdev * sd,struct v4l2_dbg_chip_ident * chip)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
indycam_probe(struct i2c_client * client,const struct i2c_device_id * id)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
indycam_remove(struct i2c_client * client)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 module_i2c_driver(indycam_driver);
391