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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
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
32MODULE_DESCRIPTION("SGI IndyCam driver");
33MODULE_VERSION(INDYCAM_MODULE_VERSION);
34MODULE_AUTHOR("Mikael Nousiainen <tmnousia@cc.hut.fi>");
35MODULE_LICENSE("GPL");
36
37
38
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
48struct indycam {
49 struct v4l2_subdev sd;
50 u8 version;
51};
52
53static inline struct indycam *to_indycam(struct v4l2_subdev *sd)
54{
55 return container_of(sd, struct indycam, sd);
56}
57
58static const u8 initseq[] = {
59 INDYCAM_CONTROL_AGCENA,
60 INDYCAM_SHUTTER_60,
61 INDYCAM_GAIN_DEFAULT,
62 0x00,
63 INDYCAM_RED_BALANCE_DEFAULT,
64 INDYCAM_BLUE_BALANCE_DEFAULT,
65 INDYCAM_RED_SATURATION_DEFAULT,
66 INDYCAM_BLUE_SATURATION_DEFAULT,
67};
68
69
70
71static 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
96static 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
117static 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
132
133#ifdef INDYCAM_DEBUG
134static 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
146static 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
221static 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
285
286static 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
298static 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
304static const struct v4l2_subdev_ops indycam_ops = {
305 .core = &indycam_core_ops,
306};
307
308static 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
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
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
365static 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
374static const struct i2c_device_id indycam_id[] = {
375 { "indycam", 0 },
376 { }
377};
378MODULE_DEVICE_TABLE(i2c, indycam_id);
379
380static 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
390module_i2c_driver(indycam_driver);
391
