2
* Driver for the ov9650 sensor
4
* Copyright (C) 2008 Erik AndrƩn
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
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
21
#include "m5602_ov9650.h"
23
static int ov9650_set_exposure(struct gspca_dev *gspca_dev, __s32 val);
24
static int ov9650_get_exposure(struct gspca_dev *gspca_dev, __s32 *val);
25
static int ov9650_get_gain(struct gspca_dev *gspca_dev, __s32 *val);
26
static int ov9650_set_gain(struct gspca_dev *gspca_dev, __s32 val);
27
static int ov9650_get_red_balance(struct gspca_dev *gspca_dev, __s32 *val);
28
static int ov9650_set_red_balance(struct gspca_dev *gspca_dev, __s32 val);
29
static int ov9650_get_blue_balance(struct gspca_dev *gspca_dev, __s32 *val);
30
static int ov9650_set_blue_balance(struct gspca_dev *gspca_dev, __s32 val);
31
static int ov9650_get_hflip(struct gspca_dev *gspca_dev, __s32 *val);
32
static int ov9650_set_hflip(struct gspca_dev *gspca_dev, __s32 val);
33
static int ov9650_get_vflip(struct gspca_dev *gspca_dev, __s32 *val);
34
static int ov9650_set_vflip(struct gspca_dev *gspca_dev, __s32 val);
35
static int ov9650_get_auto_white_balance(struct gspca_dev *gspca_dev,
37
static int ov9650_set_auto_white_balance(struct gspca_dev *gspca_dev,
39
static int ov9650_get_auto_gain(struct gspca_dev *gspca_dev, __s32 *val);
40
static int ov9650_set_auto_gain(struct gspca_dev *gspca_dev, __s32 val);
41
static int ov9650_get_auto_exposure(struct gspca_dev *gspca_dev, __s32 *val);
42
static int ov9650_set_auto_exposure(struct gspca_dev *gspca_dev, __s32 val);
44
/* Vertically and horizontally flips the image if matched, needed for machines
45
where the sensor is mounted upside down */
48
struct dmi_system_id ov9650_flip_dmi_table[] = {
52
DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
53
DMI_MATCH(DMI_PRODUCT_NAME, "A6J")
59
DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
60
DMI_MATCH(DMI_PRODUCT_NAME, "A6JC")
66
DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
67
DMI_MATCH(DMI_PRODUCT_NAME, "A6K")
73
DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
74
DMI_MATCH(DMI_PRODUCT_NAME, "A6Kt")
80
DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
81
DMI_MATCH(DMI_PRODUCT_NAME, "A6VA")
88
DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
89
DMI_MATCH(DMI_PRODUCT_NAME, "A6VC")
95
DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
96
DMI_MATCH(DMI_PRODUCT_NAME, "A6VM")
102
DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
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DMI_MATCH(DMI_PRODUCT_NAME, "A7V")
107
.ident = "Alienware Aurora m9700",
109
DMI_MATCH(DMI_SYS_VENDOR, "alienware"),
110
DMI_MATCH(DMI_PRODUCT_NAME, "Aurora m9700")
116
static const struct ctrl ov9650_ctrls[] = {
117
#define EXPOSURE_IDX 0
120
.id = V4L2_CID_EXPOSURE,
121
.type = V4L2_CTRL_TYPE_INTEGER,
126
.default_value = EXPOSURE_DEFAULT,
127
.flags = V4L2_CTRL_FLAG_SLIDER
129
.set = ov9650_set_exposure,
130
.get = ov9650_get_exposure
136
.type = V4L2_CTRL_TYPE_INTEGER,
141
.default_value = GAIN_DEFAULT,
142
.flags = V4L2_CTRL_FLAG_SLIDER
144
.set = ov9650_set_gain,
145
.get = ov9650_get_gain
147
#define RED_BALANCE_IDX 2
150
.id = V4L2_CID_RED_BALANCE,
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.type = V4L2_CTRL_TYPE_INTEGER,
152
.name = "red balance",
156
.default_value = RED_GAIN_DEFAULT,
157
.flags = V4L2_CTRL_FLAG_SLIDER
159
.set = ov9650_set_red_balance,
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.get = ov9650_get_red_balance
162
#define BLUE_BALANCE_IDX 3
165
.id = V4L2_CID_BLUE_BALANCE,
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.type = V4L2_CTRL_TYPE_INTEGER,
167
.name = "blue balance",
171
.default_value = BLUE_GAIN_DEFAULT,
172
.flags = V4L2_CTRL_FLAG_SLIDER
174
.set = ov9650_set_blue_balance,
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.get = ov9650_get_blue_balance
180
.id = V4L2_CID_HFLIP,
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.type = V4L2_CTRL_TYPE_BOOLEAN,
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.name = "horizontal flip",
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.set = ov9650_set_hflip,
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.get = ov9650_get_hflip
194
.id = V4L2_CID_VFLIP,
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.type = V4L2_CTRL_TYPE_BOOLEAN,
196
.name = "vertical flip",
202
.set = ov9650_set_vflip,
203
.get = ov9650_get_vflip
205
#define AUTO_WHITE_BALANCE_IDX 6
208
.id = V4L2_CID_AUTO_WHITE_BALANCE,
209
.type = V4L2_CTRL_TYPE_BOOLEAN,
210
.name = "auto white balance",
216
.set = ov9650_set_auto_white_balance,
217
.get = ov9650_get_auto_white_balance
219
#define AUTO_GAIN_CTRL_IDX 7
222
.id = V4L2_CID_AUTOGAIN,
223
.type = V4L2_CTRL_TYPE_BOOLEAN,
224
.name = "auto gain control",
230
.set = ov9650_set_auto_gain,
231
.get = ov9650_get_auto_gain
233
#define AUTO_EXPOSURE_IDX 8
236
.id = V4L2_CID_EXPOSURE_AUTO,
237
.type = V4L2_CTRL_TYPE_BOOLEAN,
238
.name = "auto exposure",
244
.set = ov9650_set_auto_exposure,
245
.get = ov9650_get_auto_exposure
250
static struct v4l2_pix_format ov9650_modes[] = {
259
.colorspace = V4L2_COLORSPACE_SRGB,
269
.colorspace = V4L2_COLORSPACE_SRGB,
279
.colorspace = V4L2_COLORSPACE_SRGB,
289
.colorspace = V4L2_COLORSPACE_SRGB,
294
static void ov9650_dump_registers(struct sd *sd);
296
int ov9650_probe(struct sd *sd)
299
u8 prod_id = 0, ver_id = 0, i;
300
s32 *sensor_settings;
303
if (force_sensor == OV9650_SENSOR) {
304
pr_info("Forcing an %s sensor\n", ov9650.name);
307
/* If we want to force another sensor,
308
don't try to probe this one */
312
PDEBUG(D_PROBE, "Probing for an ov9650 sensor");
314
/* Run the pre-init before probing the sensor */
315
for (i = 0; i < ARRAY_SIZE(preinit_ov9650) && !err; i++) {
316
u8 data = preinit_ov9650[i][2];
317
if (preinit_ov9650[i][0] == SENSOR)
318
err = m5602_write_sensor(sd,
319
preinit_ov9650[i][1], &data, 1);
321
err = m5602_write_bridge(sd,
322
preinit_ov9650[i][1], data);
328
if (m5602_read_sensor(sd, OV9650_PID, &prod_id, 1))
331
if (m5602_read_sensor(sd, OV9650_VER, &ver_id, 1))
334
if ((prod_id == 0x96) && (ver_id == 0x52)) {
335
pr_info("Detected an ov9650 sensor\n");
341
sensor_settings = kmalloc(
342
ARRAY_SIZE(ov9650_ctrls) * sizeof(s32), GFP_KERNEL);
343
if (!sensor_settings)
346
sd->gspca_dev.cam.cam_mode = ov9650_modes;
347
sd->gspca_dev.cam.nmodes = ARRAY_SIZE(ov9650_modes);
348
sd->desc->ctrls = ov9650_ctrls;
349
sd->desc->nctrls = ARRAY_SIZE(ov9650_ctrls);
351
for (i = 0; i < ARRAY_SIZE(ov9650_ctrls); i++)
352
sensor_settings[i] = ov9650_ctrls[i].qctrl.default_value;
353
sd->sensor_priv = sensor_settings;
357
int ov9650_init(struct sd *sd)
361
s32 *sensor_settings = sd->sensor_priv;
364
ov9650_dump_registers(sd);
366
for (i = 0; i < ARRAY_SIZE(init_ov9650) && !err; i++) {
367
data = init_ov9650[i][2];
368
if (init_ov9650[i][0] == SENSOR)
369
err = m5602_write_sensor(sd, init_ov9650[i][1],
372
err = m5602_write_bridge(sd, init_ov9650[i][1], data);
375
err = ov9650_set_exposure(&sd->gspca_dev,
376
sensor_settings[EXPOSURE_IDX]);
380
err = ov9650_set_gain(&sd->gspca_dev, sensor_settings[GAIN_IDX]);
384
err = ov9650_set_red_balance(&sd->gspca_dev,
385
sensor_settings[RED_BALANCE_IDX]);
389
err = ov9650_set_blue_balance(&sd->gspca_dev,
390
sensor_settings[BLUE_BALANCE_IDX]);
394
err = ov9650_set_hflip(&sd->gspca_dev, sensor_settings[HFLIP_IDX]);
398
err = ov9650_set_vflip(&sd->gspca_dev, sensor_settings[VFLIP_IDX]);
402
err = ov9650_set_auto_exposure(&sd->gspca_dev,
403
sensor_settings[AUTO_EXPOSURE_IDX]);
407
err = ov9650_set_auto_white_balance(&sd->gspca_dev,
408
sensor_settings[AUTO_WHITE_BALANCE_IDX]);
412
err = ov9650_set_auto_gain(&sd->gspca_dev,
413
sensor_settings[AUTO_GAIN_CTRL_IDX]);
417
int ov9650_start(struct sd *sd)
421
struct cam *cam = &sd->gspca_dev.cam;
422
s32 *sensor_settings = sd->sensor_priv;
424
int width = cam->cam_mode[sd->gspca_dev.curr_mode].width;
425
int height = cam->cam_mode[sd->gspca_dev.curr_mode].height;
426
int ver_offs = cam->cam_mode[sd->gspca_dev.curr_mode].priv;
427
int hor_offs = OV9650_LEFT_OFFSET;
429
if ((!dmi_check_system(ov9650_flip_dmi_table) &&
430
sensor_settings[VFLIP_IDX]) ||
431
(dmi_check_system(ov9650_flip_dmi_table) &&
432
!sensor_settings[VFLIP_IDX]))
438
/* Synthesize the vsync/hsync setup */
439
for (i = 0; i < ARRAY_SIZE(res_init_ov9650) && !err; i++) {
440
if (res_init_ov9650[i][0] == BRIDGE)
441
err = m5602_write_bridge(sd, res_init_ov9650[i][1],
442
res_init_ov9650[i][2]);
443
else if (res_init_ov9650[i][0] == SENSOR) {
444
data = res_init_ov9650[i][2];
445
err = m5602_write_sensor(sd,
446
res_init_ov9650[i][1], &data, 1);
452
err = m5602_write_bridge(sd, M5602_XB_VSYNC_PARA,
453
((ver_offs >> 8) & 0xff));
457
err = m5602_write_bridge(sd, M5602_XB_VSYNC_PARA, (ver_offs & 0xff));
461
err = m5602_write_bridge(sd, M5602_XB_VSYNC_PARA, 0);
465
err = m5602_write_bridge(sd, M5602_XB_VSYNC_PARA, (height >> 8) & 0xff);
469
err = m5602_write_bridge(sd, M5602_XB_VSYNC_PARA, (height & 0xff));
473
for (i = 0; i < 2 && !err; i++)
474
err = m5602_write_bridge(sd, M5602_XB_VSYNC_PARA, 0);
478
err = m5602_write_bridge(sd, M5602_XB_SIG_INI, 0);
482
err = m5602_write_bridge(sd, M5602_XB_SIG_INI, 2);
486
err = m5602_write_bridge(sd, M5602_XB_HSYNC_PARA,
487
(hor_offs >> 8) & 0xff);
491
err = m5602_write_bridge(sd, M5602_XB_HSYNC_PARA, hor_offs & 0xff);
495
err = m5602_write_bridge(sd, M5602_XB_HSYNC_PARA,
496
((width + hor_offs) >> 8) & 0xff);
500
err = m5602_write_bridge(sd, M5602_XB_HSYNC_PARA,
501
((width + hor_offs) & 0xff));
505
err = m5602_write_bridge(sd, M5602_XB_SIG_INI, 0);
511
PDEBUG(D_V4L2, "Configuring camera for VGA mode");
513
data = OV9650_VGA_SELECT | OV9650_RGB_SELECT |
514
OV9650_RAW_RGB_SELECT;
515
err = m5602_write_sensor(sd, OV9650_COM7, &data, 1);
519
PDEBUG(D_V4L2, "Configuring camera for CIF mode");
521
data = OV9650_CIF_SELECT | OV9650_RGB_SELECT |
522
OV9650_RAW_RGB_SELECT;
523
err = m5602_write_sensor(sd, OV9650_COM7, &data, 1);
527
PDEBUG(D_V4L2, "Configuring camera for QVGA mode");
529
data = OV9650_QVGA_SELECT | OV9650_RGB_SELECT |
530
OV9650_RAW_RGB_SELECT;
531
err = m5602_write_sensor(sd, OV9650_COM7, &data, 1);
535
PDEBUG(D_V4L2, "Configuring camera for QCIF mode");
537
data = OV9650_QCIF_SELECT | OV9650_RGB_SELECT |
538
OV9650_RAW_RGB_SELECT;
539
err = m5602_write_sensor(sd, OV9650_COM7, &data, 1);
545
int ov9650_stop(struct sd *sd)
547
u8 data = OV9650_SOFT_SLEEP | OV9650_OUTPUT_DRIVE_2X;
548
return m5602_write_sensor(sd, OV9650_COM2, &data, 1);
551
void ov9650_disconnect(struct sd *sd)
556
kfree(sd->sensor_priv);
559
static int ov9650_get_exposure(struct gspca_dev *gspca_dev, __s32 *val)
561
struct sd *sd = (struct sd *) gspca_dev;
562
s32 *sensor_settings = sd->sensor_priv;
564
*val = sensor_settings[EXPOSURE_IDX];
565
PDEBUG(D_V4L2, "Read exposure %d", *val);
569
static int ov9650_set_exposure(struct gspca_dev *gspca_dev, __s32 val)
571
struct sd *sd = (struct sd *) gspca_dev;
572
s32 *sensor_settings = sd->sensor_priv;
576
PDEBUG(D_V4L2, "Set exposure to %d", val);
578
sensor_settings[EXPOSURE_IDX] = val;
580
i2c_data = (val >> 10) & 0x3f;
581
err = m5602_write_sensor(sd, OV9650_AECHM,
586
/* The 8 middle bits */
587
i2c_data = (val >> 2) & 0xff;
588
err = m5602_write_sensor(sd, OV9650_AECH,
594
i2c_data = val & 0x03;
595
err = m5602_write_sensor(sd, OV9650_COM1, &i2c_data, 1);
599
static int ov9650_get_gain(struct gspca_dev *gspca_dev, __s32 *val)
601
struct sd *sd = (struct sd *) gspca_dev;
602
s32 *sensor_settings = sd->sensor_priv;
604
*val = sensor_settings[GAIN_IDX];
605
PDEBUG(D_V4L2, "Read gain %d", *val);
609
static int ov9650_set_gain(struct gspca_dev *gspca_dev, __s32 val)
613
struct sd *sd = (struct sd *) gspca_dev;
614
s32 *sensor_settings = sd->sensor_priv;
616
PDEBUG(D_V4L2, "Setting gain to %d", val);
618
sensor_settings[GAIN_IDX] = val;
621
/* Read the OV9650_VREF register first to avoid
622
corrupting the VREF high and low bits */
623
err = m5602_read_sensor(sd, OV9650_VREF, &i2c_data, 1);
627
/* Mask away all uninteresting bits */
628
i2c_data = ((val & 0x0300) >> 2) |
630
err = m5602_write_sensor(sd, OV9650_VREF, &i2c_data, 1);
635
i2c_data = val & 0xff;
636
err = m5602_write_sensor(sd, OV9650_GAIN, &i2c_data, 1);
640
static int ov9650_get_red_balance(struct gspca_dev *gspca_dev, __s32 *val)
642
struct sd *sd = (struct sd *) gspca_dev;
643
s32 *sensor_settings = sd->sensor_priv;
645
*val = sensor_settings[RED_BALANCE_IDX];
646
PDEBUG(D_V4L2, "Read red gain %d", *val);
650
static int ov9650_set_red_balance(struct gspca_dev *gspca_dev, __s32 val)
654
struct sd *sd = (struct sd *) gspca_dev;
655
s32 *sensor_settings = sd->sensor_priv;
657
PDEBUG(D_V4L2, "Set red gain to %d", val);
659
sensor_settings[RED_BALANCE_IDX] = val;
661
i2c_data = val & 0xff;
662
err = m5602_write_sensor(sd, OV9650_RED, &i2c_data, 1);
666
static int ov9650_get_blue_balance(struct gspca_dev *gspca_dev, __s32 *val)
668
struct sd *sd = (struct sd *) gspca_dev;
669
s32 *sensor_settings = sd->sensor_priv;
671
*val = sensor_settings[BLUE_BALANCE_IDX];
672
PDEBUG(D_V4L2, "Read blue gain %d", *val);
677
static int ov9650_set_blue_balance(struct gspca_dev *gspca_dev, __s32 val)
681
struct sd *sd = (struct sd *) gspca_dev;
682
s32 *sensor_settings = sd->sensor_priv;
684
PDEBUG(D_V4L2, "Set blue gain to %d", val);
686
sensor_settings[BLUE_BALANCE_IDX] = val;
688
i2c_data = val & 0xff;
689
err = m5602_write_sensor(sd, OV9650_BLUE, &i2c_data, 1);
693
static int ov9650_get_hflip(struct gspca_dev *gspca_dev, __s32 *val)
695
struct sd *sd = (struct sd *) gspca_dev;
696
s32 *sensor_settings = sd->sensor_priv;
698
*val = sensor_settings[HFLIP_IDX];
699
PDEBUG(D_V4L2, "Read horizontal flip %d", *val);
703
static int ov9650_set_hflip(struct gspca_dev *gspca_dev, __s32 val)
707
struct sd *sd = (struct sd *) gspca_dev;
708
s32 *sensor_settings = sd->sensor_priv;
710
PDEBUG(D_V4L2, "Set horizontal flip to %d", val);
712
sensor_settings[HFLIP_IDX] = val;
714
if (!dmi_check_system(ov9650_flip_dmi_table))
715
i2c_data = ((val & 0x01) << 5) |
716
(sensor_settings[VFLIP_IDX] << 4);
718
i2c_data = ((val & 0x01) << 5) |
719
(!sensor_settings[VFLIP_IDX] << 4);
721
err = m5602_write_sensor(sd, OV9650_MVFP, &i2c_data, 1);
726
static int ov9650_get_vflip(struct gspca_dev *gspca_dev, __s32 *val)
728
struct sd *sd = (struct sd *) gspca_dev;
729
s32 *sensor_settings = sd->sensor_priv;
731
*val = sensor_settings[VFLIP_IDX];
732
PDEBUG(D_V4L2, "Read vertical flip %d", *val);
737
static int ov9650_set_vflip(struct gspca_dev *gspca_dev, __s32 val)
741
struct sd *sd = (struct sd *) gspca_dev;
742
s32 *sensor_settings = sd->sensor_priv;
744
PDEBUG(D_V4L2, "Set vertical flip to %d", val);
745
sensor_settings[VFLIP_IDX] = val;
747
if (dmi_check_system(ov9650_flip_dmi_table))
750
i2c_data = ((val & 0x01) << 4) | (sensor_settings[VFLIP_IDX] << 5);
751
err = m5602_write_sensor(sd, OV9650_MVFP, &i2c_data, 1);
755
/* When vflip is toggled we need to readjust the bridge hsync/vsync */
756
if (gspca_dev->streaming)
757
err = ov9650_start(sd);
762
static int ov9650_get_auto_exposure(struct gspca_dev *gspca_dev, __s32 *val)
764
struct sd *sd = (struct sd *) gspca_dev;
765
s32 *sensor_settings = sd->sensor_priv;
767
*val = sensor_settings[AUTO_EXPOSURE_IDX];
768
PDEBUG(D_V4L2, "Read auto exposure control %d", *val);
772
static int ov9650_set_auto_exposure(struct gspca_dev *gspca_dev,
777
struct sd *sd = (struct sd *) gspca_dev;
778
s32 *sensor_settings = sd->sensor_priv;
780
PDEBUG(D_V4L2, "Set auto exposure control to %d", val);
782
sensor_settings[AUTO_EXPOSURE_IDX] = val;
783
err = m5602_read_sensor(sd, OV9650_COM8, &i2c_data, 1);
787
i2c_data = ((i2c_data & 0xfe) | ((val & 0x01) << 0));
789
return m5602_write_sensor(sd, OV9650_COM8, &i2c_data, 1);
792
static int ov9650_get_auto_white_balance(struct gspca_dev *gspca_dev,
795
struct sd *sd = (struct sd *) gspca_dev;
796
s32 *sensor_settings = sd->sensor_priv;
798
*val = sensor_settings[AUTO_WHITE_BALANCE_IDX];
802
static int ov9650_set_auto_white_balance(struct gspca_dev *gspca_dev,
807
struct sd *sd = (struct sd *) gspca_dev;
808
s32 *sensor_settings = sd->sensor_priv;
810
PDEBUG(D_V4L2, "Set auto white balance to %d", val);
812
sensor_settings[AUTO_WHITE_BALANCE_IDX] = val;
813
err = m5602_read_sensor(sd, OV9650_COM8, &i2c_data, 1);
817
i2c_data = ((i2c_data & 0xfd) | ((val & 0x01) << 1));
818
err = m5602_write_sensor(sd, OV9650_COM8, &i2c_data, 1);
823
static int ov9650_get_auto_gain(struct gspca_dev *gspca_dev, __s32 *val)
825
struct sd *sd = (struct sd *) gspca_dev;
826
s32 *sensor_settings = sd->sensor_priv;
828
*val = sensor_settings[AUTO_GAIN_CTRL_IDX];
829
PDEBUG(D_V4L2, "Read auto gain control %d", *val);
833
static int ov9650_set_auto_gain(struct gspca_dev *gspca_dev, __s32 val)
837
struct sd *sd = (struct sd *) gspca_dev;
838
s32 *sensor_settings = sd->sensor_priv;
840
PDEBUG(D_V4L2, "Set auto gain control to %d", val);
842
sensor_settings[AUTO_GAIN_CTRL_IDX] = val;
843
err = m5602_read_sensor(sd, OV9650_COM8, &i2c_data, 1);
847
i2c_data = ((i2c_data & 0xfb) | ((val & 0x01) << 2));
849
return m5602_write_sensor(sd, OV9650_COM8, &i2c_data, 1);
852
static void ov9650_dump_registers(struct sd *sd)
855
pr_info("Dumping the ov9650 register state\n");
856
for (address = 0; address < 0xa9; address++) {
858
m5602_read_sensor(sd, address, &value, 1);
859
pr_info("register 0x%x contains 0x%x\n", address, value);
862
pr_info("ov9650 register state dump complete\n");
864
pr_info("Probing for which registers that are read/write\n");
865
for (address = 0; address < 0xff; address++) {
866
u8 old_value, ctrl_value;
867
u8 test_value[2] = {0xff, 0xff};
869
m5602_read_sensor(sd, address, &old_value, 1);
870
m5602_write_sensor(sd, address, test_value, 1);
871
m5602_read_sensor(sd, address, &ctrl_value, 1);
873
if (ctrl_value == test_value[0])
874
pr_info("register 0x%x is writeable\n", address);
876
pr_info("register 0x%x is read only\n", address);
878
/* Restore original value */
879
m5602_write_sensor(sd, address, &old_value, 1);