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linux/drivers/media/i2c/ov7251.c
Todor Tomov d30bb512da media: Add a driver for the ov7251 camera sensor 
The ov7251 sensor is a 1/7.5-Inch B&W VGA (640x480) CMOS Digital Image
Sensor from Omnivision.

The driver supports the following modes:
- 640x480 30fps
- 640x480 60fps
- 640x480 90fps

Output format is 10bit B&W RAW - MEDIA_BUS_FMT_Y10_1X10.

The driver supports configuration via user controls for:
- exposure and gain;
- horizontal and vertical flip;
- test pattern.

[Sakari Ailus: Wrap a line over 80 characters, fix trivial sparse warning]

Signed-off-by: Todor Tomov <todor.tomov@linaro.org>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
2018-05-17 06:22:08 -04:00

1504 lines
35 KiB
C
Raw Blame History

// SPDX-License-Identifier: GPL-2.0
/*
* Driver for the OV7251 camera sensor.
*
* Copyright (c) 2017-2018, The Linux Foundation. All rights reserved.
* Copyright (c) 2017-2018, Linaro Ltd.
*/
#include <linux/bitops.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-fwnode.h>
#include <media/v4l2-subdev.h>
#define OV7251_SC_MODE_SELECT 0x0100
#define OV7251_SC_MODE_SELECT_SW_STANDBY 0x0
#define OV7251_SC_MODE_SELECT_STREAMING 0x1
#define OV7251_CHIP_ID_HIGH 0x300a
#define OV7251_CHIP_ID_HIGH_BYTE 0x77
#define OV7251_CHIP_ID_LOW 0x300b
#define OV7251_CHIP_ID_LOW_BYTE 0x50
#define OV7251_SC_GP_IO_IN1 0x3029
#define OV7251_AEC_EXPO_0 0x3500
#define OV7251_AEC_EXPO_1 0x3501
#define OV7251_AEC_EXPO_2 0x3502
#define OV7251_AEC_AGC_ADJ_0 0x350a
#define OV7251_AEC_AGC_ADJ_1 0x350b
#define OV7251_TIMING_FORMAT1 0x3820
#define OV7251_TIMING_FORMAT1_VFLIP BIT(2)
#define OV7251_TIMING_FORMAT2 0x3821
#define OV7251_TIMING_FORMAT2_MIRROR BIT(2)
#define OV7251_PRE_ISP_00 0x5e00
#define OV7251_PRE_ISP_00_TEST_PATTERN BIT(7)
struct reg_value {
u16 reg;
u8 val;
};
struct ov7251_mode_info {
u32 width;
u32 height;
const struct reg_value *data;
u32 data_size;
u32 pixel_clock;
u32 link_freq;
u16 exposure_max;
u16 exposure_def;
struct v4l2_fract timeperframe;
};
struct ov7251 {
struct i2c_client *i2c_client;
struct device *dev;
struct v4l2_subdev sd;
struct media_pad pad;
struct v4l2_fwnode_endpoint ep;
struct v4l2_mbus_framefmt fmt;
struct v4l2_rect crop;
struct clk *xclk;
u32 xclk_freq;
struct regulator *io_regulator;
struct regulator *core_regulator;
struct regulator *analog_regulator;
const struct ov7251_mode_info *current_mode;
struct v4l2_ctrl_handler ctrls;
struct v4l2_ctrl *pixel_clock;
struct v4l2_ctrl *link_freq;
struct v4l2_ctrl *exposure;
struct v4l2_ctrl *gain;
/* Cached register values */
u8 aec_pk_manual;
u8 pre_isp_00;
u8 timing_format1;
u8 timing_format2;
struct mutex lock; /* lock to protect power state, ctrls and mode */
bool power_on;
struct gpio_desc *enable_gpio;
};
static inline struct ov7251 *to_ov7251(struct v4l2_subdev *sd)
{
return container_of(sd, struct ov7251, sd);
}
static const struct reg_value ov7251_global_init_setting[] = {
{ 0x0103, 0x01 },
{ 0x303b, 0x02 },
};
static const struct reg_value ov7251_setting_vga_30fps[] = {
{ 0x3005, 0x00 },
{ 0x3012, 0xc0 },
{ 0x3013, 0xd2 },
{ 0x3014, 0x04 },
{ 0x3016, 0xf0 },
{ 0x3017, 0xf0 },
{ 0x3018, 0xf0 },
{ 0x301a, 0xf0 },
{ 0x301b, 0xf0 },
{ 0x301c, 0xf0 },
{ 0x3023, 0x05 },
{ 0x3037, 0xf0 },
{ 0x3098, 0x04 }, /* pll2 pre divider */
{ 0x3099, 0x28 }, /* pll2 multiplier */
{ 0x309a, 0x05 }, /* pll2 sys divider */
{ 0x309b, 0x04 }, /* pll2 adc divider */
{ 0x309d, 0x00 }, /* pll2 divider */
{ 0x30b0, 0x0a }, /* pll1 pix divider */
{ 0x30b1, 0x01 }, /* pll1 divider */
{ 0x30b3, 0x64 }, /* pll1 multiplier */
{ 0x30b4, 0x03 }, /* pll1 pre divider */
{ 0x30b5, 0x05 }, /* pll1 mipi divider */
{ 0x3106, 0xda },
{ 0x3503, 0x07 },
{ 0x3509, 0x10 },
{ 0x3600, 0x1c },
{ 0x3602, 0x62 },
{ 0x3620, 0xb7 },
{ 0x3622, 0x04 },
{ 0x3626, 0x21 },
{ 0x3627, 0x30 },
{ 0x3630, 0x44 },
{ 0x3631, 0x35 },
{ 0x3634, 0x60 },
{ 0x3636, 0x00 },
{ 0x3662, 0x01 },
{ 0x3663, 0x70 },
{ 0x3664, 0x50 },
{ 0x3666, 0x0a },
{ 0x3669, 0x1a },
{ 0x366a, 0x00 },
{ 0x366b, 0x50 },
{ 0x3673, 0x01 },
{ 0x3674, 0xff },
{ 0x3675, 0x03 },
{ 0x3705, 0xc1 },
{ 0x3709, 0x40 },
{ 0x373c, 0x08 },
{ 0x3742, 0x00 },
{ 0x3757, 0xb3 },
{ 0x3788, 0x00 },
{ 0x37a8, 0x01 },
{ 0x37a9, 0xc0 },
{ 0x3800, 0x00 },
{ 0x3801, 0x04 },
{ 0x3802, 0x00 },
{ 0x3803, 0x04 },
{ 0x3804, 0x02 },
{ 0x3805, 0x8b },
{ 0x3806, 0x01 },
{ 0x3807, 0xeb },
{ 0x3808, 0x02 }, /* width high */
{ 0x3809, 0x80 }, /* width low */
{ 0x380a, 0x01 }, /* height high */
{ 0x380b, 0xe0 }, /* height low */
{ 0x380c, 0x03 }, /* total horiz timing high */
{ 0x380d, 0xa0 }, /* total horiz timing low */
{ 0x380e, 0x06 }, /* total vertical timing high */
{ 0x380f, 0xbc }, /* total vertical timing low */
{ 0x3810, 0x00 },
{ 0x3811, 0x04 },
{ 0x3812, 0x00 },
{ 0x3813, 0x05 },
{ 0x3814, 0x11 },
{ 0x3815, 0x11 },
{ 0x3820, 0x40 },
{ 0x3821, 0x00 },
{ 0x382f, 0x0e },
{ 0x3832, 0x00 },
{ 0x3833, 0x05 },
{ 0x3834, 0x00 },
{ 0x3835, 0x0c },
{ 0x3837, 0x00 },
{ 0x3b80, 0x00 },
{ 0x3b81, 0xa5 },
{ 0x3b82, 0x10 },
{ 0x3b83, 0x00 },
{ 0x3b84, 0x08 },
{ 0x3b85, 0x00 },
{ 0x3b86, 0x01 },
{ 0x3b87, 0x00 },
{ 0x3b88, 0x00 },
{ 0x3b89, 0x00 },
{ 0x3b8a, 0x00 },
{ 0x3b8b, 0x05 },
{ 0x3b8c, 0x00 },
{ 0x3b8d, 0x00 },
{ 0x3b8e, 0x00 },
{ 0x3b8f, 0x1a },
{ 0x3b94, 0x05 },
{ 0x3b95, 0xf2 },
{ 0x3b96, 0x40 },
{ 0x3c00, 0x89 },
{ 0x3c01, 0x63 },
{ 0x3c02, 0x01 },
{ 0x3c03, 0x00 },
{ 0x3c04, 0x00 },
{ 0x3c05, 0x03 },
{ 0x3c06, 0x00 },
{ 0x3c07, 0x06 },
{ 0x3c0c, 0x01 },
{ 0x3c0d, 0xd0 },
{ 0x3c0e, 0x02 },
{ 0x3c0f, 0x0a },
{ 0x4001, 0x42 },
{ 0x4004, 0x04 },
{ 0x4005, 0x00 },
{ 0x404e, 0x01 },
{ 0x4300, 0xff },
{ 0x4301, 0x00 },
{ 0x4315, 0x00 },
{ 0x4501, 0x48 },
{ 0x4600, 0x00 },
{ 0x4601, 0x4e },
{ 0x4801, 0x0f },
{ 0x4806, 0x0f },
{ 0x4819, 0xaa },
{ 0x4823, 0x3e },
{ 0x4837, 0x19 },
{ 0x4a0d, 0x00 },
{ 0x4a47, 0x7f },
{ 0x4a49, 0xf0 },
{ 0x4a4b, 0x30 },
{ 0x5000, 0x85 },
{ 0x5001, 0x80 },
};
static const struct reg_value ov7251_setting_vga_60fps[] = {
{ 0x3005, 0x00 },
{ 0x3012, 0xc0 },
{ 0x3013, 0xd2 },
{ 0x3014, 0x04 },
{ 0x3016, 0x10 },
{ 0x3017, 0x00 },
{ 0x3018, 0x00 },
{ 0x301a, 0x00 },
{ 0x301b, 0x00 },
{ 0x301c, 0x00 },
{ 0x3023, 0x05 },
{ 0x3037, 0xf0 },
{ 0x3098, 0x04 }, /* pll2 pre divider */
{ 0x3099, 0x28 }, /* pll2 multiplier */
{ 0x309a, 0x05 }, /* pll2 sys divider */
{ 0x309b, 0x04 }, /* pll2 adc divider */
{ 0x309d, 0x00 }, /* pll2 divider */
{ 0x30b0, 0x0a }, /* pll1 pix divider */
{ 0x30b1, 0x01 }, /* pll1 divider */
{ 0x30b3, 0x64 }, /* pll1 multiplier */
{ 0x30b4, 0x03 }, /* pll1 pre divider */
{ 0x30b5, 0x05 }, /* pll1 mipi divider */
{ 0x3106, 0xda },
{ 0x3503, 0x07 },
{ 0x3509, 0x10 },
{ 0x3600, 0x1c },
{ 0x3602, 0x62 },
{ 0x3620, 0xb7 },
{ 0x3622, 0x04 },
{ 0x3626, 0x21 },
{ 0x3627, 0x30 },
{ 0x3630, 0x44 },
{ 0x3631, 0x35 },
{ 0x3634, 0x60 },
{ 0x3636, 0x00 },
{ 0x3662, 0x01 },
{ 0x3663, 0x70 },
{ 0x3664, 0x50 },
{ 0x3666, 0x0a },
{ 0x3669, 0x1a },
{ 0x366a, 0x00 },
{ 0x366b, 0x50 },
{ 0x3673, 0x01 },
{ 0x3674, 0xff },
{ 0x3675, 0x03 },
{ 0x3705, 0xc1 },
{ 0x3709, 0x40 },
{ 0x373c, 0x08 },
{ 0x3742, 0x00 },
{ 0x3757, 0xb3 },
{ 0x3788, 0x00 },
{ 0x37a8, 0x01 },
{ 0x37a9, 0xc0 },
{ 0x3800, 0x00 },
{ 0x3801, 0x04 },
{ 0x3802, 0x00 },
{ 0x3803, 0x04 },
{ 0x3804, 0x02 },
{ 0x3805, 0x8b },
{ 0x3806, 0x01 },
{ 0x3807, 0xeb },
{ 0x3808, 0x02 }, /* width high */
{ 0x3809, 0x80 }, /* width low */
{ 0x380a, 0x01 }, /* height high */
{ 0x380b, 0xe0 }, /* height low */
{ 0x380c, 0x03 }, /* total horiz timing high */
{ 0x380d, 0xa0 }, /* total horiz timing low */
{ 0x380e, 0x03 }, /* total vertical timing high */
{ 0x380f, 0x5c }, /* total vertical timing low */
{ 0x3810, 0x00 },
{ 0x3811, 0x04 },
{ 0x3812, 0x00 },
{ 0x3813, 0x05 },
{ 0x3814, 0x11 },
{ 0x3815, 0x11 },
{ 0x3820, 0x40 },
{ 0x3821, 0x00 },
{ 0x382f, 0x0e },
{ 0x3832, 0x00 },
{ 0x3833, 0x05 },
{ 0x3834, 0x00 },
{ 0x3835, 0x0c },
{ 0x3837, 0x00 },
{ 0x3b80, 0x00 },
{ 0x3b81, 0xa5 },
{ 0x3b82, 0x10 },
{ 0x3b83, 0x00 },
{ 0x3b84, 0x08 },
{ 0x3b85, 0x00 },
{ 0x3b86, 0x01 },
{ 0x3b87, 0x00 },
{ 0x3b88, 0x00 },
{ 0x3b89, 0x00 },
{ 0x3b8a, 0x00 },
{ 0x3b8b, 0x05 },
{ 0x3b8c, 0x00 },
{ 0x3b8d, 0x00 },
{ 0x3b8e, 0x00 },
{ 0x3b8f, 0x1a },
{ 0x3b94, 0x05 },
{ 0x3b95, 0xf2 },
{ 0x3b96, 0x40 },
{ 0x3c00, 0x89 },
{ 0x3c01, 0x63 },
{ 0x3c02, 0x01 },
{ 0x3c03, 0x00 },
{ 0x3c04, 0x00 },
{ 0x3c05, 0x03 },
{ 0x3c06, 0x00 },
{ 0x3c07, 0x06 },
{ 0x3c0c, 0x01 },
{ 0x3c0d, 0xd0 },
{ 0x3c0e, 0x02 },
{ 0x3c0f, 0x0a },
{ 0x4001, 0x42 },
{ 0x4004, 0x04 },
{ 0x4005, 0x00 },
{ 0x404e, 0x01 },
{ 0x4300, 0xff },
{ 0x4301, 0x00 },
{ 0x4315, 0x00 },
{ 0x4501, 0x48 },
{ 0x4600, 0x00 },
{ 0x4601, 0x4e },
{ 0x4801, 0x0f },
{ 0x4806, 0x0f },
{ 0x4819, 0xaa },
{ 0x4823, 0x3e },
{ 0x4837, 0x19 },
{ 0x4a0d, 0x00 },
{ 0x4a47, 0x7f },
{ 0x4a49, 0xf0 },
{ 0x4a4b, 0x30 },
{ 0x5000, 0x85 },
{ 0x5001, 0x80 },
};
static const struct reg_value ov7251_setting_vga_90fps[] = {
{ 0x3005, 0x00 },
{ 0x3012, 0xc0 },
{ 0x3013, 0xd2 },
{ 0x3014, 0x04 },
{ 0x3016, 0x10 },
{ 0x3017, 0x00 },
{ 0x3018, 0x00 },
{ 0x301a, 0x00 },
{ 0x301b, 0x00 },
{ 0x301c, 0x00 },
{ 0x3023, 0x05 },
{ 0x3037, 0xf0 },
{ 0x3098, 0x04 }, /* pll2 pre divider */
{ 0x3099, 0x28 }, /* pll2 multiplier */
{ 0x309a, 0x05 }, /* pll2 sys divider */
{ 0x309b, 0x04 }, /* pll2 adc divider */
{ 0x309d, 0x00 }, /* pll2 divider */
{ 0x30b0, 0x0a }, /* pll1 pix divider */
{ 0x30b1, 0x01 }, /* pll1 divider */
{ 0x30b3, 0x64 }, /* pll1 multiplier */
{ 0x30b4, 0x03 }, /* pll1 pre divider */
{ 0x30b5, 0x05 }, /* pll1 mipi divider */
{ 0x3106, 0xda },
{ 0x3503, 0x07 },
{ 0x3509, 0x10 },
{ 0x3600, 0x1c },
{ 0x3602, 0x62 },
{ 0x3620, 0xb7 },
{ 0x3622, 0x04 },
{ 0x3626, 0x21 },
{ 0x3627, 0x30 },
{ 0x3630, 0x44 },
{ 0x3631, 0x35 },
{ 0x3634, 0x60 },
{ 0x3636, 0x00 },
{ 0x3662, 0x01 },
{ 0x3663, 0x70 },
{ 0x3664, 0x50 },
{ 0x3666, 0x0a },
{ 0x3669, 0x1a },
{ 0x366a, 0x00 },
{ 0x366b, 0x50 },
{ 0x3673, 0x01 },
{ 0x3674, 0xff },
{ 0x3675, 0x03 },
{ 0x3705, 0xc1 },
{ 0x3709, 0x40 },
{ 0x373c, 0x08 },
{ 0x3742, 0x00 },
{ 0x3757, 0xb3 },
{ 0x3788, 0x00 },
{ 0x37a8, 0x01 },
{ 0x37a9, 0xc0 },
{ 0x3800, 0x00 },
{ 0x3801, 0x04 },
{ 0x3802, 0x00 },
{ 0x3803, 0x04 },
{ 0x3804, 0x02 },
{ 0x3805, 0x8b },
{ 0x3806, 0x01 },
{ 0x3807, 0xeb },
{ 0x3808, 0x02 }, /* width high */
{ 0x3809, 0x80 }, /* width low */
{ 0x380a, 0x01 }, /* height high */
{ 0x380b, 0xe0 }, /* height low */
{ 0x380c, 0x03 }, /* total horiz timing high */
{ 0x380d, 0xa0 }, /* total horiz timing low */
{ 0x380e, 0x02 }, /* total vertical timing high */
{ 0x380f, 0x3c }, /* total vertical timing low */
{ 0x3810, 0x00 },
{ 0x3811, 0x04 },
{ 0x3812, 0x00 },
{ 0x3813, 0x05 },
{ 0x3814, 0x11 },
{ 0x3815, 0x11 },
{ 0x3820, 0x40 },
{ 0x3821, 0x00 },
{ 0x382f, 0x0e },
{ 0x3832, 0x00 },
{ 0x3833, 0x05 },
{ 0x3834, 0x00 },
{ 0x3835, 0x0c },
{ 0x3837, 0x00 },
{ 0x3b80, 0x00 },
{ 0x3b81, 0xa5 },
{ 0x3b82, 0x10 },
{ 0x3b83, 0x00 },
{ 0x3b84, 0x08 },
{ 0x3b85, 0x00 },
{ 0x3b86, 0x01 },
{ 0x3b87, 0x00 },
{ 0x3b88, 0x00 },
{ 0x3b89, 0x00 },
{ 0x3b8a, 0x00 },
{ 0x3b8b, 0x05 },
{ 0x3b8c, 0x00 },
{ 0x3b8d, 0x00 },
{ 0x3b8e, 0x00 },
{ 0x3b8f, 0x1a },
{ 0x3b94, 0x05 },
{ 0x3b95, 0xf2 },
{ 0x3b96, 0x40 },
{ 0x3c00, 0x89 },
{ 0x3c01, 0x63 },
{ 0x3c02, 0x01 },
{ 0x3c03, 0x00 },
{ 0x3c04, 0x00 },
{ 0x3c05, 0x03 },
{ 0x3c06, 0x00 },
{ 0x3c07, 0x06 },
{ 0x3c0c, 0x01 },
{ 0x3c0d, 0xd0 },
{ 0x3c0e, 0x02 },
{ 0x3c0f, 0x0a },
{ 0x4001, 0x42 },
{ 0x4004, 0x04 },
{ 0x4005, 0x00 },
{ 0x404e, 0x01 },
{ 0x4300, 0xff },
{ 0x4301, 0x00 },
{ 0x4315, 0x00 },
{ 0x4501, 0x48 },
{ 0x4600, 0x00 },
{ 0x4601, 0x4e },
{ 0x4801, 0x0f },
{ 0x4806, 0x0f },
{ 0x4819, 0xaa },
{ 0x4823, 0x3e },
{ 0x4837, 0x19 },
{ 0x4a0d, 0x00 },
{ 0x4a47, 0x7f },
{ 0x4a49, 0xf0 },
{ 0x4a4b, 0x30 },
{ 0x5000, 0x85 },
{ 0x5001, 0x80 },
};
static const s64 link_freq[] = {
240000000,
};
static const struct ov7251_mode_info ov7251_mode_info_data[] = {
{
.width = 640,
.height = 480,
.data = ov7251_setting_vga_30fps,
.data_size = ARRAY_SIZE(ov7251_setting_vga_30fps),
.pixel_clock = 48000000,
.link_freq = 0, /* an index in link_freq[] */
.exposure_max = 1704,
.exposure_def = 504,
.timeperframe = {
.numerator = 100,
.denominator = 3000
}
},
{
.width = 640,
.height = 480,
.data = ov7251_setting_vga_60fps,
.data_size = ARRAY_SIZE(ov7251_setting_vga_60fps),
.pixel_clock = 48000000,
.link_freq = 0, /* an index in link_freq[] */
.exposure_max = 840,
.exposure_def = 504,
.timeperframe = {
.numerator = 100,
.denominator = 6014
}
},
{
.width = 640,
.height = 480,
.data = ov7251_setting_vga_90fps,
.data_size = ARRAY_SIZE(ov7251_setting_vga_90fps),
.pixel_clock = 48000000,
.link_freq = 0, /* an index in link_freq[] */
.exposure_max = 552,
.exposure_def = 504,
.timeperframe = {
.numerator = 100,
.denominator = 9043
}
},
};
static int ov7251_regulators_enable(struct ov7251 *ov7251)
{
int ret;
/* OV7251 power up sequence requires core regulator
* to be enabled not earlier than io regulator
*/
ret = regulator_enable(ov7251->io_regulator);
if (ret < 0) {
dev_err(ov7251->dev, "set io voltage failed\n");
return ret;
}
ret = regulator_enable(ov7251->analog_regulator);
if (ret) {
dev_err(ov7251->dev, "set analog voltage failed\n");
goto err_disable_io;
}
ret = regulator_enable(ov7251->core_regulator);
if (ret) {
dev_err(ov7251->dev, "set core voltage failed\n");
goto err_disable_analog;
}
return 0;
err_disable_analog:
regulator_disable(ov7251->analog_regulator);
err_disable_io:
regulator_disable(ov7251->io_regulator);
return ret;
}
static void ov7251_regulators_disable(struct ov7251 *ov7251)
{
int ret;
ret = regulator_disable(ov7251->core_regulator);
if (ret < 0)
dev_err(ov7251->dev, "core regulator disable failed\n");
ret = regulator_disable(ov7251->analog_regulator);
if (ret < 0)
dev_err(ov7251->dev, "analog regulator disable failed\n");
ret = regulator_disable(ov7251->io_regulator);
if (ret < 0)
dev_err(ov7251->dev, "io regulator disable failed\n");
}
static int ov7251_write_reg(struct ov7251 *ov7251, u16 reg, u8 val)
{
u8 regbuf[3];
int ret;
regbuf[0] = reg >> 8;
regbuf[1] = reg & 0xff;
regbuf[2] = val;
ret = i2c_master_send(ov7251->i2c_client, regbuf, 3);
if (ret < 0) {
dev_err(ov7251->dev, "%s: write reg error %d: reg=%x, val=%x\n",
__func__, ret, reg, val);
return ret;
}
return 0;
}
static int ov7251_write_seq_regs(struct ov7251 *ov7251, u16 reg, u8 *val,
u8 num)
{
u8 regbuf[5];
u8 nregbuf = sizeof(reg) + num * sizeof(*val);
int ret = 0;
if (nregbuf > sizeof(regbuf))
return -EINVAL;
regbuf[0] = reg >> 8;
regbuf[1] = reg & 0xff;
memcpy(regbuf + 2, val, num);
ret = i2c_master_send(ov7251->i2c_client, regbuf, nregbuf);
if (ret < 0) {
dev_err(ov7251->dev,
"%s: write seq regs error %d: first reg=%x\n",
__func__, ret, reg);
return ret;
}
return 0;
}
static int ov7251_read_reg(struct ov7251 *ov7251, u16 reg, u8 *val)
{
u8 regbuf[2];
int ret;
regbuf[0] = reg >> 8;
regbuf[1] = reg & 0xff;
ret = i2c_master_send(ov7251->i2c_client, regbuf, 2);
if (ret < 0) {
dev_err(ov7251->dev, "%s: write reg error %d: reg=%x\n",
__func__, ret, reg);
return ret;
}
ret = i2c_master_recv(ov7251->i2c_client, val, 1);
if (ret < 0) {
dev_err(ov7251->dev, "%s: read reg error %d: reg=%x\n",
__func__, ret, reg);
return ret;
}
return 0;
}
static int ov7251_set_exposure(struct ov7251 *ov7251, s32 exposure)
{
u16 reg;
u8 val[3];
reg = OV7251_AEC_EXPO_0;
val[0] = (exposure & 0xf000) >> 12; /* goes to OV7251_AEC_EXPO_0 */
val[1] = (exposure & 0x0ff0) >> 4; /* goes to OV7251_AEC_EXPO_1 */
val[2] = (exposure & 0x000f) << 4; /* goes to OV7251_AEC_EXPO_2 */
return ov7251_write_seq_regs(ov7251, reg, val, 3);
}
static int ov7251_set_gain(struct ov7251 *ov7251, s32 gain)
{
u16 reg;
u8 val[2];
reg = OV7251_AEC_AGC_ADJ_0;
val[0] = (gain & 0x0300) >> 8; /* goes to OV7251_AEC_AGC_ADJ_0 */
val[1] = gain & 0xff; /* goes to OV7251_AEC_AGC_ADJ_1 */
return ov7251_write_seq_regs(ov7251, reg, val, 2);
}
static int ov7251_set_register_array(struct ov7251 *ov7251,
const struct reg_value *settings,
unsigned int num_settings)
{
unsigned int i;
int ret;
for (i = 0; i < num_settings; ++i, ++settings) {
ret = ov7251_write_reg(ov7251, settings->reg, settings->val);
if (ret < 0)
return ret;
}
return 0;
}
static int ov7251_set_power_on(struct ov7251 *ov7251)
{
int ret;
u32 wait_us;
ret = ov7251_regulators_enable(ov7251);
if (ret < 0)
return ret;
ret = clk_prepare_enable(ov7251->xclk);
if (ret < 0) {
dev_err(ov7251->dev, "clk prepare enable failed\n");
ov7251_regulators_disable(ov7251);
return ret;
}
gpiod_set_value_cansleep(ov7251->enable_gpio, 1);
/* wait at least 65536 external clock cycles */
wait_us = DIV_ROUND_UP(65536 * 1000,
DIV_ROUND_UP(ov7251->xclk_freq, 1000));
usleep_range(wait_us, wait_us + 1000);
return 0;
}
static void ov7251_set_power_off(struct ov7251 *ov7251)
{
clk_disable_unprepare(ov7251->xclk);
gpiod_set_value_cansleep(ov7251->enable_gpio, 0);
ov7251_regulators_disable(ov7251);
}
static int ov7251_s_power(struct v4l2_subdev *sd, int on)
{
struct ov7251 *ov7251 = to_ov7251(sd);
int ret = 0;
mutex_lock(&ov7251->lock);
/* If the power state is not modified - no work to do. */
if (ov7251->power_on == !!on)
goto exit;
if (on) {
ret = ov7251_set_power_on(ov7251);
if (ret < 0)
goto exit;
ret = ov7251_set_register_array(ov7251,
ov7251_global_init_setting,
ARRAY_SIZE(ov7251_global_init_setting));
if (ret < 0) {
dev_err(ov7251->dev, "could not set init registers\n");
ov7251_set_power_off(ov7251);
goto exit;
}
ov7251->power_on = true;
} else {
ov7251_set_power_off(ov7251);
ov7251->power_on = false;
}
exit:
mutex_unlock(&ov7251->lock);
return ret;
}
static int ov7251_set_hflip(struct ov7251 *ov7251, s32 value)
{
u8 val = ov7251->timing_format2;
int ret;
if (value)
val |= OV7251_TIMING_FORMAT2_MIRROR;
else
val &= ~OV7251_TIMING_FORMAT2_MIRROR;
ret = ov7251_write_reg(ov7251, OV7251_TIMING_FORMAT2, val);
if (!ret)
ov7251->timing_format2 = val;
return ret;
}
static int ov7251_set_vflip(struct ov7251 *ov7251, s32 value)
{
u8 val = ov7251->timing_format1;
int ret;
if (value)
val |= OV7251_TIMING_FORMAT1_VFLIP;
else
val &= ~OV7251_TIMING_FORMAT1_VFLIP;
ret = ov7251_write_reg(ov7251, OV7251_TIMING_FORMAT1, val);
if (!ret)
ov7251->timing_format1 = val;
return ret;
}
static int ov7251_set_test_pattern(struct ov7251 *ov7251, s32 value)
{
u8 val = ov7251->pre_isp_00;
int ret;
if (value)
val |= OV7251_PRE_ISP_00_TEST_PATTERN;
else
val &= ~OV7251_PRE_ISP_00_TEST_PATTERN;
ret = ov7251_write_reg(ov7251, OV7251_PRE_ISP_00, val);
if (!ret)
ov7251->pre_isp_00 = val;
return ret;
}
static const char * const ov7251_test_pattern_menu[] = {
"Disabled",
"Vertical Pattern Bars",
};
static int ov7251_s_ctrl(struct v4l2_ctrl *ctrl)
{
struct ov7251 *ov7251 = container_of(ctrl->handler,
struct ov7251, ctrls);
int ret;
/* v4l2_ctrl_lock() locks our mutex */
if (!ov7251->power_on)
return 0;
switch (ctrl->id) {
case V4L2_CID_EXPOSURE:
ret = ov7251_set_exposure(ov7251, ctrl->val);
break;
case V4L2_CID_GAIN:
ret = ov7251_set_gain(ov7251, ctrl->val);
break;
case V4L2_CID_TEST_PATTERN:
ret = ov7251_set_test_pattern(ov7251, ctrl->val);
break;
case V4L2_CID_HFLIP:
ret = ov7251_set_hflip(ov7251, ctrl->val);
break;
case V4L2_CID_VFLIP:
ret = ov7251_set_vflip(ov7251, ctrl->val);
break;
default:
ret = -EINVAL;
break;
}
return ret;
}
static const struct v4l2_ctrl_ops ov7251_ctrl_ops = {
.s_ctrl = ov7251_s_ctrl,
};
static int ov7251_enum_mbus_code(struct v4l2_subdev *sd,
struct v4l2_subdev_pad_config *cfg,
struct v4l2_subdev_mbus_code_enum *code)
{
if (code->index > 0)
return -EINVAL;
code->code = MEDIA_BUS_FMT_Y10_1X10;
return 0;
}
static int ov7251_enum_frame_size(struct v4l2_subdev *subdev,
struct v4l2_subdev_pad_config *cfg,
struct v4l2_subdev_frame_size_enum *fse)
{
if (fse->code != MEDIA_BUS_FMT_Y10_1X10)
return -EINVAL;
if (fse->index >= ARRAY_SIZE(ov7251_mode_info_data))
return -EINVAL;
fse->min_width = ov7251_mode_info_data[fse->index].width;
fse->max_width = ov7251_mode_info_data[fse->index].width;
fse->min_height = ov7251_mode_info_data[fse->index].height;
fse->max_height = ov7251_mode_info_data[fse->index].height;
return 0;
}
static int ov7251_enum_frame_ival(struct v4l2_subdev *subdev,
struct v4l2_subdev_pad_config *cfg,
struct v4l2_subdev_frame_interval_enum *fie)
{
unsigned int index = fie->index;
unsigned int i;
for (i = 0; i < ARRAY_SIZE(ov7251_mode_info_data); i++) {
if (fie->width != ov7251_mode_info_data[i].width ||
fie->height != ov7251_mode_info_data[i].height)
continue;
if (index-- == 0) {
fie->interval = ov7251_mode_info_data[i].timeperframe;
return 0;
}
}
return -EINVAL;
}
static struct v4l2_mbus_framefmt *
__ov7251_get_pad_format(struct ov7251 *ov7251,
struct v4l2_subdev_pad_config *cfg,
unsigned int pad,
enum v4l2_subdev_format_whence which)
{
switch (which) {
case V4L2_SUBDEV_FORMAT_TRY:
return v4l2_subdev_get_try_format(&ov7251->sd, cfg, pad);
case V4L2_SUBDEV_FORMAT_ACTIVE:
return &ov7251->fmt;
default:
return NULL;
}
}
static int ov7251_get_format(struct v4l2_subdev *sd,
struct v4l2_subdev_pad_config *cfg,
struct v4l2_subdev_format *format)
{
struct ov7251 *ov7251 = to_ov7251(sd);
mutex_lock(&ov7251->lock);
format->format = *__ov7251_get_pad_format(ov7251, cfg, format->pad,
format->which);
mutex_unlock(&ov7251->lock);
return 0;
}
static struct v4l2_rect *
__ov7251_get_pad_crop(struct ov7251 *ov7251, struct v4l2_subdev_pad_config *cfg,
unsigned int pad, enum v4l2_subdev_format_whence which)
{
switch (which) {
case V4L2_SUBDEV_FORMAT_TRY:
return v4l2_subdev_get_try_crop(&ov7251->sd, cfg, pad);
case V4L2_SUBDEV_FORMAT_ACTIVE:
return &ov7251->crop;
default:
return NULL;
}
}
static inline u32 avg_fps(const struct v4l2_fract *t)
{
return (t->denominator + (t->numerator >> 1)) / t->numerator;
}
static const struct ov7251_mode_info *
ov7251_find_mode_by_ival(struct ov7251 *ov7251, struct v4l2_fract *timeperframe)
{
const struct ov7251_mode_info *mode = ov7251->current_mode;
unsigned int fps_req = avg_fps(timeperframe);
unsigned int max_dist_match = (unsigned int) -1;
unsigned int i, n = 0;
for (i = 0; i < ARRAY_SIZE(ov7251_mode_info_data); i++) {
unsigned int dist;
unsigned int fps_tmp;
if (mode->width != ov7251_mode_info_data[i].width ||
mode->height != ov7251_mode_info_data[i].height)
continue;
fps_tmp = avg_fps(&ov7251_mode_info_data[i].timeperframe);
dist = abs(fps_req - fps_tmp);
if (dist < max_dist_match) {
n = i;
max_dist_match = dist;
}
}
return &ov7251_mode_info_data[n];
}
static int ov7251_set_format(struct v4l2_subdev *sd,
struct v4l2_subdev_pad_config *cfg,
struct v4l2_subdev_format *format)
{
struct ov7251 *ov7251 = to_ov7251(sd);
struct v4l2_mbus_framefmt *__format;
struct v4l2_rect *__crop;
const struct ov7251_mode_info *new_mode;
int ret = 0;
mutex_lock(&ov7251->lock);
__crop = __ov7251_get_pad_crop(ov7251, cfg, format->pad, format->which);
new_mode = v4l2_find_nearest_size(ov7251_mode_info_data,
ARRAY_SIZE(ov7251_mode_info_data),
width, height,
format->format.width, format->format.height);
__crop->width = new_mode->width;
__crop->height = new_mode->height;
if (format->which == V4L2_SUBDEV_FORMAT_ACTIVE) {
ret = __v4l2_ctrl_s_ctrl_int64(ov7251->pixel_clock,
new_mode->pixel_clock);
if (ret < 0)
goto exit;
ret = __v4l2_ctrl_s_ctrl(ov7251->link_freq,
new_mode->link_freq);
if (ret < 0)
goto exit;
ret = __v4l2_ctrl_modify_range(ov7251->exposure,
1, new_mode->exposure_max,
1, new_mode->exposure_def);
if (ret < 0)
goto exit;
ret = __v4l2_ctrl_s_ctrl(ov7251->exposure,
new_mode->exposure_def);
if (ret < 0)
goto exit;
ret = __v4l2_ctrl_s_ctrl(ov7251->gain, 16);
if (ret < 0)
goto exit;
ov7251->current_mode = new_mode;
}
__format = __ov7251_get_pad_format(ov7251, cfg, format->pad,
format->which);
__format->width = __crop->width;
__format->height = __crop->height;
__format->code = MEDIA_BUS_FMT_Y10_1X10;
__format->field = V4L2_FIELD_NONE;
__format->colorspace = V4L2_COLORSPACE_SRGB;
__format->ycbcr_enc = V4L2_MAP_YCBCR_ENC_DEFAULT(__format->colorspace);
__format->quantization = V4L2_MAP_QUANTIZATION_DEFAULT(true,
__format->colorspace, __format->ycbcr_enc);
__format->xfer_func = V4L2_MAP_XFER_FUNC_DEFAULT(__format->colorspace);
format->format = *__format;
exit:
mutex_unlock(&ov7251->lock);
return ret;
}
static int ov7251_entity_init_cfg(struct v4l2_subdev *subdev,
struct v4l2_subdev_pad_config *cfg)
{
struct v4l2_subdev_format fmt = {
.which = cfg ? V4L2_SUBDEV_FORMAT_TRY
: V4L2_SUBDEV_FORMAT_ACTIVE,
.format = {
.width = 640,
.height = 480
}
};
ov7251_set_format(subdev, cfg, &fmt);
return 0;
}
static int ov7251_get_selection(struct v4l2_subdev *sd,
struct v4l2_subdev_pad_config *cfg,
struct v4l2_subdev_selection *sel)
{
struct ov7251 *ov7251 = to_ov7251(sd);
if (sel->target != V4L2_SEL_TGT_CROP)
return -EINVAL;
mutex_lock(&ov7251->lock);
sel->r = *__ov7251_get_pad_crop(ov7251, cfg, sel->pad,
sel->which);
mutex_unlock(&ov7251->lock);
return 0;
}
static int ov7251_s_stream(struct v4l2_subdev *subdev, int enable)
{
struct ov7251 *ov7251 = to_ov7251(subdev);
int ret;
mutex_lock(&ov7251->lock);
if (enable) {
ret = ov7251_set_register_array(ov7251,
ov7251->current_mode->data,
ov7251->current_mode->data_size);
if (ret < 0) {
dev_err(ov7251->dev, "could not set mode %dx%d\n",
ov7251->current_mode->width,
ov7251->current_mode->height);
goto exit;
}
ret = __v4l2_ctrl_handler_setup(&ov7251->ctrls);
if (ret < 0) {
dev_err(ov7251->dev, "could not sync v4l2 controls\n");
goto exit;
}
ret = ov7251_write_reg(ov7251, OV7251_SC_MODE_SELECT,
OV7251_SC_MODE_SELECT_STREAMING);
} else {
ret = ov7251_write_reg(ov7251, OV7251_SC_MODE_SELECT,
OV7251_SC_MODE_SELECT_SW_STANDBY);
}
exit:
mutex_unlock(&ov7251->lock);
return ret;
}
static int ov7251_get_frame_interval(struct v4l2_subdev *subdev,
struct v4l2_subdev_frame_interval *fi)
{
struct ov7251 *ov7251 = to_ov7251(subdev);
mutex_lock(&ov7251->lock);
fi->interval = ov7251->current_mode->timeperframe;
mutex_unlock(&ov7251->lock);
return 0;
}
static int ov7251_set_frame_interval(struct v4l2_subdev *subdev,
struct v4l2_subdev_frame_interval *fi)
{
struct ov7251 *ov7251 = to_ov7251(subdev);
const struct ov7251_mode_info *new_mode;
int ret = 0;
mutex_lock(&ov7251->lock);
new_mode = ov7251_find_mode_by_ival(ov7251, &fi->interval);
if (new_mode != ov7251->current_mode) {
ret = __v4l2_ctrl_s_ctrl_int64(ov7251->pixel_clock,
new_mode->pixel_clock);
if (ret < 0)
goto exit;
ret = __v4l2_ctrl_s_ctrl(ov7251->link_freq,
new_mode->link_freq);
if (ret < 0)
goto exit;
ret = __v4l2_ctrl_modify_range(ov7251->exposure,
1, new_mode->exposure_max,
1, new_mode->exposure_def);
if (ret < 0)
goto exit;
ret = __v4l2_ctrl_s_ctrl(ov7251->exposure,
new_mode->exposure_def);
if (ret < 0)
goto exit;
ret = __v4l2_ctrl_s_ctrl(ov7251->gain, 16);
if (ret < 0)
goto exit;
ov7251->current_mode = new_mode;
}
fi->interval = ov7251->current_mode->timeperframe;
exit:
mutex_unlock(&ov7251->lock);
return ret;
}
static const struct v4l2_subdev_core_ops ov7251_core_ops = {
.s_power = ov7251_s_power,
};
static const struct v4l2_subdev_video_ops ov7251_video_ops = {
.s_stream = ov7251_s_stream,
.g_frame_interval = ov7251_get_frame_interval,
.s_frame_interval = ov7251_set_frame_interval,
};
static const struct v4l2_subdev_pad_ops ov7251_subdev_pad_ops = {
.init_cfg = ov7251_entity_init_cfg,
.enum_mbus_code = ov7251_enum_mbus_code,
.enum_frame_size = ov7251_enum_frame_size,
.enum_frame_interval = ov7251_enum_frame_ival,
.get_fmt = ov7251_get_format,
.set_fmt = ov7251_set_format,
.get_selection = ov7251_get_selection,
};
static const struct v4l2_subdev_ops ov7251_subdev_ops = {
.core = &ov7251_core_ops,
.video = &ov7251_video_ops,
.pad = &ov7251_subdev_pad_ops,
};
static int ov7251_probe(struct i2c_client *client)
{
struct device *dev = &client->dev;
struct fwnode_handle *endpoint;
struct ov7251 *ov7251;
u8 chip_id_high, chip_id_low, chip_rev;
int ret;
ov7251 = devm_kzalloc(dev, sizeof(struct ov7251), GFP_KERNEL);
if (!ov7251)
return -ENOMEM;
ov7251->i2c_client = client;
ov7251->dev = dev;
endpoint = fwnode_graph_get_next_endpoint(dev_fwnode(dev), NULL);
if (!endpoint) {
dev_err(dev, "endpoint node not found\n");
return -EINVAL;
}
ret = v4l2_fwnode_endpoint_parse(endpoint, &ov7251->ep);
fwnode_handle_put(endpoint);
if (ret < 0) {
dev_err(dev, "parsing endpoint node failed\n");
return ret;
}
if (ov7251->ep.bus_type != V4L2_MBUS_CSI2) {
dev_err(dev, "invalid bus type (%u), must be CSI2 (%u)\n",
ov7251->ep.bus_type, V4L2_MBUS_CSI2);
return -EINVAL;
}
/* get system clock (xclk) */
ov7251->xclk = devm_clk_get(dev, "xclk");
if (IS_ERR(ov7251->xclk)) {
dev_err(dev, "could not get xclk");
return PTR_ERR(ov7251->xclk);
}
ret = fwnode_property_read_u32(dev_fwnode(dev), "clock-frequency",
&ov7251->xclk_freq);
if (ret) {
dev_err(dev, "could not get xclk frequency\n");
return ret;
}
/* external clock must be 24MHz, allow 1% tolerance */
if (ov7251->xclk_freq < 23760000 || ov7251->xclk_freq > 24240000) {
dev_err(dev, "external clock frequency %u is not supported\n",
ov7251->xclk_freq);
return -EINVAL;
}
ret = clk_set_rate(ov7251->xclk, ov7251->xclk_freq);
if (ret) {
dev_err(dev, "could not set xclk frequency\n");
return ret;
}
ov7251->io_regulator = devm_regulator_get(dev, "vdddo");
if (IS_ERR(ov7251->io_regulator)) {
dev_err(dev, "cannot get io regulator\n");
return PTR_ERR(ov7251->io_regulator);
}
ov7251->core_regulator = devm_regulator_get(dev, "vddd");
if (IS_ERR(ov7251->core_regulator)) {
dev_err(dev, "cannot get core regulator\n");
return PTR_ERR(ov7251->core_regulator);
}
ov7251->analog_regulator = devm_regulator_get(dev, "vdda");
if (IS_ERR(ov7251->analog_regulator)) {
dev_err(dev, "cannot get analog regulator\n");
return PTR_ERR(ov7251->analog_regulator);
}
ov7251->enable_gpio = devm_gpiod_get(dev, "enable", GPIOD_OUT_HIGH);
if (IS_ERR(ov7251->enable_gpio)) {
dev_err(dev, "cannot get enable gpio\n");
return PTR_ERR(ov7251->enable_gpio);
}
mutex_init(&ov7251->lock);
v4l2_ctrl_handler_init(&ov7251->ctrls, 7);
ov7251->ctrls.lock = &ov7251->lock;
v4l2_ctrl_new_std(&ov7251->ctrls, &ov7251_ctrl_ops,
V4L2_CID_HFLIP, 0, 1, 1, 0);
v4l2_ctrl_new_std(&ov7251->ctrls, &ov7251_ctrl_ops,
V4L2_CID_VFLIP, 0, 1, 1, 0);
ov7251->exposure = v4l2_ctrl_new_std(&ov7251->ctrls, &ov7251_ctrl_ops,
V4L2_CID_EXPOSURE, 1, 32, 1, 32);
ov7251->gain = v4l2_ctrl_new_std(&ov7251->ctrls, &ov7251_ctrl_ops,
V4L2_CID_GAIN, 16, 1023, 1, 16);
v4l2_ctrl_new_std_menu_items(&ov7251->ctrls, &ov7251_ctrl_ops,
V4L2_CID_TEST_PATTERN,
ARRAY_SIZE(ov7251_test_pattern_menu) - 1,
0, 0, ov7251_test_pattern_menu);
ov7251->pixel_clock = v4l2_ctrl_new_std(&ov7251->ctrls,
&ov7251_ctrl_ops,
V4L2_CID_PIXEL_RATE,
1, INT_MAX, 1, 1);
ov7251->link_freq = v4l2_ctrl_new_int_menu(&ov7251->ctrls,
&ov7251_ctrl_ops,
V4L2_CID_LINK_FREQ,
ARRAY_SIZE(link_freq) - 1,
0, link_freq);
if (ov7251->link_freq)
ov7251->link_freq->flags |= V4L2_CTRL_FLAG_READ_ONLY;
ov7251->sd.ctrl_handler = &ov7251->ctrls;
if (ov7251->ctrls.error) {
dev_err(dev, "%s: control initialization error %d\n",
__func__, ov7251->ctrls.error);
ret = ov7251->ctrls.error;
goto free_ctrl;
}
v4l2_i2c_subdev_init(&ov7251->sd, client, &ov7251_subdev_ops);
ov7251->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
ov7251->pad.flags = MEDIA_PAD_FL_SOURCE;
ov7251->sd.dev = &client->dev;
ov7251->sd.entity.function = MEDIA_ENT_F_CAM_SENSOR;
ret = media_entity_pads_init(&ov7251->sd.entity, 1, &ov7251->pad);
if (ret < 0) {
dev_err(dev, "could not register media entity\n");
goto free_ctrl;
}
ret = ov7251_s_power(&ov7251->sd, true);
if (ret < 0) {
dev_err(dev, "could not power up OV7251\n");
goto free_entity;
}
ret = ov7251_read_reg(ov7251, OV7251_CHIP_ID_HIGH, &chip_id_high);
if (ret < 0 || chip_id_high != OV7251_CHIP_ID_HIGH_BYTE) {
dev_err(dev, "could not read ID high\n");
ret = -ENODEV;
goto power_down;
}
ret = ov7251_read_reg(ov7251, OV7251_CHIP_ID_LOW, &chip_id_low);
if (ret < 0 || chip_id_low != OV7251_CHIP_ID_LOW_BYTE) {
dev_err(dev, "could not read ID low\n");
ret = -ENODEV;
goto power_down;
}
ret = ov7251_read_reg(ov7251, OV7251_SC_GP_IO_IN1, &chip_rev);
if (ret < 0) {
dev_err(dev, "could not read revision\n");
ret = -ENODEV;
goto power_down;
}
chip_rev >>= 4;
dev_info(dev, "OV7251 revision %x (%s) detected at address 0x%02x\n",
chip_rev,
chip_rev == 0x4 ? "1A / 1B" :
chip_rev == 0x5 ? "1C / 1D" :
chip_rev == 0x6 ? "1E" :
chip_rev == 0x7 ? "1F" : "unknown",
client->addr);
ret = ov7251_read_reg(ov7251, OV7251_PRE_ISP_00,
&ov7251->pre_isp_00);
if (ret < 0) {
dev_err(dev, "could not read test pattern value\n");
ret = -ENODEV;
goto power_down;
}
ret = ov7251_read_reg(ov7251, OV7251_TIMING_FORMAT1,
&ov7251->timing_format1);
if (ret < 0) {
dev_err(dev, "could not read vflip value\n");
ret = -ENODEV;
goto power_down;
}
ret = ov7251_read_reg(ov7251, OV7251_TIMING_FORMAT2,
&ov7251->timing_format2);
if (ret < 0) {
dev_err(dev, "could not read hflip value\n");
ret = -ENODEV;
goto power_down;
}
ov7251_s_power(&ov7251->sd, false);
ret = v4l2_async_register_subdev(&ov7251->sd);
if (ret < 0) {
dev_err(dev, "could not register v4l2 device\n");
goto free_entity;
}
ov7251_entity_init_cfg(&ov7251->sd, NULL);
return 0;
power_down:
ov7251_s_power(&ov7251->sd, false);
free_entity:
media_entity_cleanup(&ov7251->sd.entity);
free_ctrl:
v4l2_ctrl_handler_free(&ov7251->ctrls);
mutex_destroy(&ov7251->lock);
return ret;
}
static int ov7251_remove(struct i2c_client *client)
{
struct v4l2_subdev *sd = i2c_get_clientdata(client);
struct ov7251 *ov7251 = to_ov7251(sd);
v4l2_async_unregister_subdev(&ov7251->sd);
media_entity_cleanup(&ov7251->sd.entity);
v4l2_ctrl_handler_free(&ov7251->ctrls);
mutex_destroy(&ov7251->lock);
return 0;
}
static const struct of_device_id ov7251_of_match[] = {
{ .compatible = "ovti,ov7251" },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, ov7251_of_match);
static struct i2c_driver ov7251_i2c_driver = {
.driver = {
.of_match_table = ov7251_of_match,
.name = "ov7251",
},
.probe_new = ov7251_probe,
.remove = ov7251_remove,
};
module_i2c_driver(ov7251_i2c_driver);
MODULE_DESCRIPTION("Omnivision OV7251 Camera Driver");
MODULE_AUTHOR("Todor Tomov <todor.tomov@linaro.org>");
MODULE_LICENSE("GPL v2");
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