2 * Driver for the ov7660 sensor
4 * Copyright (C) 2009 Erik Andrén
5 * Copyright (C) 2007 Ilyes Gouta. Based on the m5603x Linux Driver Project.
6 * Copyright (C) 2005 m5603x Linux Driver Project <m5602@x3ng.com.br>
8 * Portions of code to USB interface and ALi driver software,
9 * Copyright (c) 2006 Willem Duinker
10 * v4l2 interface modeled after the V4L2 driver
11 * for SN9C10x PC Camera Controllers
13 * This program is free software; you can redistribute it and/or
14 * modify it under the terms of the GNU General Public License as
15 * published by the Free Software Foundation, version 2.
19 #include "m5602_ov7660.h"
21 static int ov7660_get_gain(struct gspca_dev *gspca_dev, __s32 *val);
22 static int ov7660_set_gain(struct gspca_dev *gspca_dev, __s32 val);
23 static int ov7660_get_auto_white_balance(struct gspca_dev *gspca_dev,
25 static int ov7660_set_auto_white_balance(struct gspca_dev *gspca_dev,
27 static int ov7660_get_auto_gain(struct gspca_dev *gspca_dev, __s32 *val);
28 static int ov7660_set_auto_gain(struct gspca_dev *gspca_dev, __s32 val);
29 static int ov7660_get_auto_exposure(struct gspca_dev *gspca_dev, __s32 *val);
30 static int ov7660_set_auto_exposure(struct gspca_dev *gspca_dev, __s32 val);
31 static int ov7660_get_hflip(struct gspca_dev *gspca_dev, __s32 *val);
32 static int ov7660_set_hflip(struct gspca_dev *gspca_dev, __s32 val);
33 static int ov7660_get_vflip(struct gspca_dev *gspca_dev, __s32 *val);
34 static int ov7660_set_vflip(struct gspca_dev *gspca_dev, __s32 val);
36 static const struct ctrl ov7660_ctrls[] = {
41 .type = V4L2_CTRL_TYPE_INTEGER,
46 .default_value = OV7660_DEFAULT_GAIN,
47 .flags = V4L2_CTRL_FLAG_SLIDER
49 .set = ov7660_set_gain,
50 .get = ov7660_get_gain
52 #define BLUE_BALANCE_IDX 2
53 #define RED_BALANCE_IDX 3
54 #define AUTO_WHITE_BALANCE_IDX 4
57 .id = V4L2_CID_AUTO_WHITE_BALANCE,
58 .type = V4L2_CTRL_TYPE_BOOLEAN,
59 .name = "auto white balance",
65 .set = ov7660_set_auto_white_balance,
66 .get = ov7660_get_auto_white_balance
68 #define AUTO_GAIN_CTRL_IDX 5
71 .id = V4L2_CID_AUTOGAIN,
72 .type = V4L2_CTRL_TYPE_BOOLEAN,
73 .name = "auto gain control",
79 .set = ov7660_set_auto_gain,
80 .get = ov7660_get_auto_gain
82 #define AUTO_EXPOSURE_IDX 6
85 .id = V4L2_CID_EXPOSURE_AUTO,
86 .type = V4L2_CTRL_TYPE_BOOLEAN,
87 .name = "auto exposure",
93 .set = ov7660_set_auto_exposure,
94 .get = ov7660_get_auto_exposure
100 .type = V4L2_CTRL_TYPE_BOOLEAN,
101 .name = "horizontal flip",
107 .set = ov7660_set_hflip,
108 .get = ov7660_get_hflip
113 .id = V4L2_CID_VFLIP,
114 .type = V4L2_CTRL_TYPE_BOOLEAN,
115 .name = "vertical flip",
121 .set = ov7660_set_vflip,
122 .get = ov7660_get_vflip
127 static struct v4l2_pix_format ov7660_modes[] = {
136 .colorspace = V4L2_COLORSPACE_SRGB,
141 static void ov7660_dump_registers(struct sd *sd);
143 int ov7660_probe(struct sd *sd)
146 u8 prod_id = 0, ver_id = 0;
148 s32 *sensor_settings;
151 if (force_sensor == OV7660_SENSOR) {
152 info("Forcing an %s sensor", ov7660.name);
155 /* If we want to force another sensor,
156 don't try to probe this one */
161 for (i = 0; i < ARRAY_SIZE(preinit_ov7660) && !err; i++) {
164 if (preinit_ov7660[i][0] == BRIDGE) {
165 err = m5602_write_bridge(sd,
166 preinit_ov7660[i][1],
167 preinit_ov7660[i][2]);
169 data[0] = preinit_ov7660[i][2];
170 err = m5602_write_sensor(sd,
171 preinit_ov7660[i][1], data, 1);
177 if (m5602_read_sensor(sd, OV7660_PID, &prod_id, 1))
180 if (m5602_read_sensor(sd, OV7660_VER, &ver_id, 1))
183 info("Sensor reported 0x%x%x", prod_id, ver_id);
185 if ((prod_id == 0x76) && (ver_id == 0x60)) {
186 info("Detected a ov7660 sensor");
192 sensor_settings = kmalloc(
193 ARRAY_SIZE(ov7660_ctrls) * sizeof(s32), GFP_KERNEL);
194 if (!sensor_settings)
197 sd->gspca_dev.cam.cam_mode = ov7660_modes;
198 sd->gspca_dev.cam.nmodes = ARRAY_SIZE(ov7660_modes);
199 sd->desc->ctrls = ov7660_ctrls;
200 sd->desc->nctrls = ARRAY_SIZE(ov7660_ctrls);
202 for (i = 0; i < ARRAY_SIZE(ov7660_ctrls); i++)
203 sensor_settings[i] = ov7660_ctrls[i].qctrl.default_value;
204 sd->sensor_priv = sensor_settings;
209 int ov7660_init(struct sd *sd)
212 s32 *sensor_settings = sd->sensor_priv;
214 /* Init the sensor */
215 for (i = 0; i < ARRAY_SIZE(init_ov7660); i++) {
218 if (init_ov7660[i][0] == BRIDGE) {
219 err = m5602_write_bridge(sd,
223 data[0] = init_ov7660[i][2];
224 err = m5602_write_sensor(sd,
225 init_ov7660[i][1], data, 1);
230 ov7660_dump_registers(sd);
232 err = ov7660_set_gain(&sd->gspca_dev, sensor_settings[GAIN_IDX]);
236 err = ov7660_set_auto_white_balance(&sd->gspca_dev,
237 sensor_settings[AUTO_WHITE_BALANCE_IDX]);
241 err = ov7660_set_auto_gain(&sd->gspca_dev,
242 sensor_settings[AUTO_GAIN_CTRL_IDX]);
246 err = ov7660_set_auto_exposure(&sd->gspca_dev,
247 sensor_settings[AUTO_EXPOSURE_IDX]);
250 err = ov7660_set_hflip(&sd->gspca_dev,
251 sensor_settings[HFLIP_IDX]);
255 err = ov7660_set_vflip(&sd->gspca_dev,
256 sensor_settings[VFLIP_IDX]);
261 int ov7660_start(struct sd *sd)
266 int ov7660_stop(struct sd *sd)
271 void ov7660_disconnect(struct sd *sd)
276 kfree(sd->sensor_priv);
279 static int ov7660_get_gain(struct gspca_dev *gspca_dev, __s32 *val)
281 struct sd *sd = (struct sd *) gspca_dev;
282 s32 *sensor_settings = sd->sensor_priv;
284 *val = sensor_settings[GAIN_IDX];
285 PDEBUG(D_V4L2, "Read gain %d", *val);
289 static int ov7660_set_gain(struct gspca_dev *gspca_dev, __s32 val)
293 struct sd *sd = (struct sd *) gspca_dev;
294 s32 *sensor_settings = sd->sensor_priv;
296 PDEBUG(D_V4L2, "Setting gain to %d", val);
298 sensor_settings[GAIN_IDX] = val;
300 err = m5602_write_sensor(sd, OV7660_GAIN, &i2c_data, 1);
305 static int ov7660_get_auto_white_balance(struct gspca_dev *gspca_dev,
308 struct sd *sd = (struct sd *) gspca_dev;
309 s32 *sensor_settings = sd->sensor_priv;
311 *val = sensor_settings[AUTO_WHITE_BALANCE_IDX];
315 static int ov7660_set_auto_white_balance(struct gspca_dev *gspca_dev,
320 struct sd *sd = (struct sd *) gspca_dev;
321 s32 *sensor_settings = sd->sensor_priv;
323 PDEBUG(D_V4L2, "Set auto white balance to %d", val);
325 sensor_settings[AUTO_WHITE_BALANCE_IDX] = val;
326 err = m5602_read_sensor(sd, OV7660_COM8, &i2c_data, 1);
330 i2c_data = ((i2c_data & 0xfd) | ((val & 0x01) << 1));
331 err = m5602_write_sensor(sd, OV7660_COM8, &i2c_data, 1);
336 static int ov7660_get_auto_gain(struct gspca_dev *gspca_dev, __s32 *val)
338 struct sd *sd = (struct sd *) gspca_dev;
339 s32 *sensor_settings = sd->sensor_priv;
341 *val = sensor_settings[AUTO_GAIN_CTRL_IDX];
342 PDEBUG(D_V4L2, "Read auto gain control %d", *val);
346 static int ov7660_set_auto_gain(struct gspca_dev *gspca_dev, __s32 val)
350 struct sd *sd = (struct sd *) gspca_dev;
351 s32 *sensor_settings = sd->sensor_priv;
353 PDEBUG(D_V4L2, "Set auto gain control to %d", val);
355 sensor_settings[AUTO_GAIN_CTRL_IDX] = val;
356 err = m5602_read_sensor(sd, OV7660_COM8, &i2c_data, 1);
360 i2c_data = ((i2c_data & 0xfb) | ((val & 0x01) << 2));
362 return m5602_write_sensor(sd, OV7660_COM8, &i2c_data, 1);
365 static int ov7660_get_auto_exposure(struct gspca_dev *gspca_dev, __s32 *val)
367 struct sd *sd = (struct sd *) gspca_dev;
368 s32 *sensor_settings = sd->sensor_priv;
370 *val = sensor_settings[AUTO_EXPOSURE_IDX];
371 PDEBUG(D_V4L2, "Read auto exposure control %d", *val);
375 static int ov7660_set_auto_exposure(struct gspca_dev *gspca_dev,
380 struct sd *sd = (struct sd *) gspca_dev;
381 s32 *sensor_settings = sd->sensor_priv;
383 PDEBUG(D_V4L2, "Set auto exposure control to %d", val);
385 sensor_settings[AUTO_EXPOSURE_IDX] = val;
386 err = m5602_read_sensor(sd, OV7660_COM8, &i2c_data, 1);
390 i2c_data = ((i2c_data & 0xfe) | ((val & 0x01) << 0));
392 return m5602_write_sensor(sd, OV7660_COM8, &i2c_data, 1);
395 static int ov7660_get_hflip(struct gspca_dev *gspca_dev, __s32 *val)
397 struct sd *sd = (struct sd *) gspca_dev;
398 s32 *sensor_settings = sd->sensor_priv;
400 *val = sensor_settings[HFLIP_IDX];
401 PDEBUG(D_V4L2, "Read horizontal flip %d", *val);
405 static int ov7660_set_hflip(struct gspca_dev *gspca_dev, __s32 val)
409 struct sd *sd = (struct sd *) gspca_dev;
410 s32 *sensor_settings = sd->sensor_priv;
412 PDEBUG(D_V4L2, "Set horizontal flip to %d", val);
414 sensor_settings[HFLIP_IDX] = val;
416 i2c_data = ((val & 0x01) << 5) |
417 (sensor_settings[VFLIP_IDX] << 4);
419 err = m5602_write_sensor(sd, OV7660_MVFP, &i2c_data, 1);
424 static int ov7660_get_vflip(struct gspca_dev *gspca_dev, __s32 *val)
426 struct sd *sd = (struct sd *) gspca_dev;
427 s32 *sensor_settings = sd->sensor_priv;
429 *val = sensor_settings[VFLIP_IDX];
430 PDEBUG(D_V4L2, "Read vertical flip %d", *val);
435 static int ov7660_set_vflip(struct gspca_dev *gspca_dev, __s32 val)
439 struct sd *sd = (struct sd *) gspca_dev;
440 s32 *sensor_settings = sd->sensor_priv;
442 PDEBUG(D_V4L2, "Set vertical flip to %d", val);
443 sensor_settings[VFLIP_IDX] = val;
445 i2c_data = ((val & 0x01) << 4) | (sensor_settings[VFLIP_IDX] << 5);
446 err = m5602_write_sensor(sd, OV7660_MVFP, &i2c_data, 1);
450 /* When vflip is toggled we need to readjust the bridge hsync/vsync */
451 if (gspca_dev->streaming)
452 err = ov7660_start(sd);
457 static void ov7660_dump_registers(struct sd *sd)
460 info("Dumping the ov7660 register state");
461 for (address = 0; address < 0xa9; address++) {
463 m5602_read_sensor(sd, address, &value, 1);
464 info("register 0x%x contains 0x%x",
468 info("ov7660 register state dump complete");
470 info("Probing for which registers that are read/write");
471 for (address = 0; address < 0xff; address++) {
472 u8 old_value, ctrl_value;
473 u8 test_value[2] = {0xff, 0xff};
475 m5602_read_sensor(sd, address, &old_value, 1);
476 m5602_write_sensor(sd, address, test_value, 1);
477 m5602_read_sensor(sd, address, &ctrl_value, 1);
479 if (ctrl_value == test_value[0])
480 info("register 0x%x is writeable", address);
482 info("register 0x%x is read only", address);
484 /* Restore original value */
485 m5602_write_sensor(sd, address, &old_value, 1);