[PATCH v3] ov5675: Add support for OV5675 sensor

[Shawnx Tu <shawnx.tu@intel.com>]

From: Shawn Tu <shawnx.tu@intel.com>

Add a V4L2 sub-device driver for Omnivision ov5675 image sensor.
This is a camera sensor using the I2C bus for control and the
CSI-2 bus for data.

This driver supports following features:
- manual exposure and analog/digital gain control support
- vblank/hblank control support
- test pattern support
- media controller support
- runtime PM support
- support following resolutions:
  + 2592x1944 at 30FPS
  + 1296x972  at 30FPS

Signed-off-by: Shawn Tu <shawnx.tu@intel.com>
---
 MAINTAINERS                |    7 +
 drivers/media/i2c/Kconfig  |   13 +
 drivers/media/i2c/Makefile |    1 +
 drivers/media/i2c/ov5675.c | 1183 ++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 1204 insertions(+)
 create mode 100644 drivers/media/i2c/ov5675.c

diff --git a/MAINTAINERS b/MAINTAINERS
index 6426db5..1e4692d 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -11845,6 +11845,13 @@ T:	git git://linuxtv.org/media_tree.git
 S:	Maintained
 F:	drivers/media/i2c/ov5647.c
 
+OMNIVISION OV5675 SENSOR DRIVER
+M:	Shawn Tu <shawnx.tu@intel.com>
+L:	linux-media@vger.kernel.org
+T:	git git://linuxtv.org/media_tree.git
+S:	Maintained
+F:	drivers/media/i2c/ov5675.c
+
 OMNIVISION OV5695 SENSOR DRIVER
 M:	Shunqian Zheng <zhengsq@rock-chips.com>
 L:	linux-media@vger.kernel.org
diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
index 79ce9ec..7d5aba9 100644
--- a/drivers/media/i2c/Kconfig
+++ b/drivers/media/i2c/Kconfig
@@ -723,6 +723,19 @@ config VIDEO_OV5670
 	  To compile this driver as a module, choose M here: the
 	  module will be called ov5670.
 
+config VIDEO_OV5675
+	tristate "OmniVision OV5675 sensor support"
+	depends on I2C && VIDEO_V4L2 && VIDEO_V4L2_SUBDEV_API
+	depends on MEDIA_CAMERA_SUPPORT
+	depends on MEDIA_CONTROLLER
+	select V4L2_FWNODE
+	help
+	  This is a Video4Linux2 sensor driver for the OmniVision
+	  OV5675 camera.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called ov5675.
+
 config VIDEO_OV5695
 	tristate "OmniVision OV5695 sensor support"
 	depends on I2C && VIDEO_V4L2
diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile
index fd4ea86..beb170b 100644
--- a/drivers/media/i2c/Makefile
+++ b/drivers/media/i2c/Makefile
@@ -70,6 +70,7 @@ obj-$(CONFIG_VIDEO_OV5640) += ov5640.o
 obj-$(CONFIG_VIDEO_OV5645) += ov5645.o
 obj-$(CONFIG_VIDEO_OV5647) += ov5647.o
 obj-$(CONFIG_VIDEO_OV5670) += ov5670.o
+obj-$(CONFIG_VIDEO_OV5675) += ov5675.o
 obj-$(CONFIG_VIDEO_OV5695) += ov5695.o
 obj-$(CONFIG_VIDEO_OV6650) += ov6650.o
 obj-$(CONFIG_VIDEO_OV7251) += ov7251.o
diff --git a/drivers/media/i2c/ov5675.c b/drivers/media/i2c/ov5675.c
new file mode 100644
index 0000000..091a56e
--- /dev/null
+++ b/drivers/media/i2c/ov5675.c
@@ -0,0 +1,1183 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2019 Intel Corporation.
+
+#include <asm/unaligned.h>
+#include <linux/acpi.h>
+#include <linux/delay.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/pm_runtime.h>
+#include <media/v4l2-ctrls.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-fwnode.h>
+
+#define OV5675_REG_VALUE_08BIT		1
+#define OV5675_REG_VALUE_16BIT		2
+#define OV5675_REG_VALUE_24BIT		3
+
+#define OV5675_LINK_FREQ_450MHZ		450000000ULL
+#define OV5675_SCLK			90000000LL
+#define OV5675_MCLK			19200000
+#define OV5675_DATA_LANES		2
+#define OV5675_RGB_DEPTH		10
+
+#define OV5675_REG_CHIP_ID		0x300a
+#define OV5675_CHIP_ID			0x5675
+
+#define OV5675_REG_MODE_SELECT		0x0100
+#define OV5675_MODE_STANDBY		0x00
+#define OV5675_MODE_STREAMING		0x01
+
+/* vertical-timings from sensor */
+#define OV5675_REG_VTS			0x380e
+#define OV5675_VTS_30FPS		0x07e4
+#define OV5675_VTS_30FPS_MIN		0x07e4
+#define OV5675_VTS_MAX			0x7fff
+
+/* horizontal-timings from sensor */
+#define OV5675_REG_HTS			0x380c
+
+/* Exposure controls from sensor */
+#define OV5675_REG_EXPOSURE		0x3500
+#define	OV5675_EXPOSURE_MIN		4
+#define OV5675_EXPOSURE_MAX_MARGIN	4
+#define	OV5675_EXPOSURE_STEP		1
+
+/* Analog gain controls from sensor */
+#define OV5675_REG_ANALOG_GAIN		0x3508
+#define	OV5675_ANAL_GAIN_MIN		128
+#define	OV5675_ANAL_GAIN_MAX		2047
+#define	OV5675_ANAL_GAIN_STEP		1
+
+/* Digital gain controls from sensor */
+#define OV5675_REG_MWB_R_GAIN		0x5019
+#define OV5675_REG_MWB_G_GAIN		0x501b
+#define OV5675_REG_MWB_B_GAIN		0x501d
+#define OV5675_DGTL_GAIN_MIN		0
+#define OV5675_DGTL_GAIN_MAX		4095
+#define OV5675_DGTL_GAIN_STEP		1
+#define OV5675_DGTL_GAIN_DEFAULT	1024
+
+/* Test Pattern Control */
+#define OV5675_REG_TEST_PATTERN		0x4503
+#define OV5675_TEST_PATTERN_ENABLE	BIT(7)
+#define OV5675_TEST_PATTERN_BAR_SHIFT	2
+
+#define to_ov5675(_sd)			container_of(_sd, struct ov5675, sd)
+
+enum {
+	OV5675_LINK_FREQ_900MBPS,
+};
+
+struct ov5675_reg {
+	u16 address;
+	u8 val;
+};
+
+struct ov5675_reg_list {
+	u32 num_of_regs;
+	const struct ov5675_reg *regs;
+};
+
+struct ov5675_link_freq_config {
+	const struct ov5675_reg_list reg_list;
+};
+
+struct ov5675_mode {
+	/* Frame width in pixels */
+	u32 width;
+
+	/* Frame height in pixels */
+	u32 height;
+
+	/* Horizontal timining size */
+	u32 hts;
+
+	/* Default vertical timining size */
+	u32 vts_def;
+
+	/* Min vertical timining size */
+	u32 vts_min;
+
+	/* Link frequency needed for this resolution */
+	u32 link_freq_index;
+
+	/* Sensor register settings for this resolution */
+	const struct ov5675_reg_list reg_list;
+};
+
+static const struct ov5675_reg mipi_data_rate_900mbps[] = {
+	{0x0103, 0x01},
+	{0x0100, 0x00},
+	{0x0300, 0x04},
+	{0x0302, 0x8d},
+	{0x0303, 0x00},
+	{0x030d, 0x26},
+};
+
+static const struct ov5675_reg mode_2592x1944_regs[] = {
+	{0x3002, 0x21},
+	{0x3107, 0x23},
+	{0x3501, 0x20},
+	{0x3503, 0x0c},
+	{0x3508, 0x03},
+	{0x3509, 0x00},
+	{0x3600, 0x66},
+	{0x3602, 0x30},
+	{0x3610, 0xa5},
+	{0x3612, 0x93},
+	{0x3620, 0x80},
+	{0x3642, 0x0e},
+	{0x3661, 0x00},
+	{0x3662, 0x10},
+	{0x3664, 0xf3},
+	{0x3665, 0x9e},
+	{0x3667, 0xa5},
+	{0x366e, 0x55},
+	{0x366f, 0x55},
+	{0x3670, 0x11},
+	{0x3671, 0x11},
+	{0x3672, 0x11},
+	{0x3673, 0x11},
+	{0x3714, 0x24},
+	{0x371a, 0x3e},
+	{0x3733, 0x10},
+	{0x3734, 0x00},
+	{0x373d, 0x24},
+	{0x3764, 0x20},
+	{0x3765, 0x20},
+	{0x3766, 0x12},
+	{0x37a1, 0x14},
+	{0x37a8, 0x1c},
+	{0x37ab, 0x0f},
+	{0x37c2, 0x04},
+	{0x37cb, 0x00},
+	{0x37cc, 0x00},
+	{0x37cd, 0x00},
+	{0x37ce, 0x00},
+	{0x37d8, 0x02},
+	{0x37d9, 0x08},
+	{0x37dc, 0x04},
+	{0x3800, 0x00},
+	{0x3801, 0x00},
+	{0x3802, 0x00},
+	{0x3803, 0x04},
+	{0x3804, 0x0a},
+	{0x3805, 0x3f},
+	{0x3806, 0x07},
+	{0x3807, 0xb3},
+	{0x3808, 0x0a},
+	{0x3809, 0x20},
+	{0x380a, 0x07},
+	{0x380b, 0x98},
+	{0x380c, 0x02},
+	{0x380d, 0xee},
+	{0x380e, 0x07},
+	{0x380f, 0xe4},
+	{0x3811, 0x10},
+	{0x3813, 0x0d},
+	{0x3814, 0x01},
+	{0x3815, 0x01},
+	{0x3816, 0x01},
+	{0x3817, 0x01},
+	{0x381e, 0x02},
+	{0x3820, 0x88},
+	{0x3821, 0x01},
+	{0x3832, 0x04},
+	{0x3c80, 0x01},
+	{0x3c82, 0x00},
+	{0x3c83, 0xc8},
+	{0x3c8c, 0x0f},
+	{0x3c8d, 0xa0},
+	{0x3c90, 0x07},
+	{0x3c91, 0x00},
+	{0x3c92, 0x00},
+	{0x3c93, 0x00},
+	{0x3c94, 0xd0},
+	{0x3c95, 0x50},
+	{0x3c96, 0x35},
+	{0x3c97, 0x00},
+	{0x4001, 0xe0},
+	{0x4008, 0x02},
+	{0x4009, 0x0d},
+	{0x400f, 0x80},
+	{0x4013, 0x02},
+	{0x4040, 0x00},
+	{0x4041, 0x07},
+	{0x404c, 0x50},
+	{0x404e, 0x20},
+	{0x4500, 0x06},
+	{0x4503, 0x00},
+	{0x450a, 0x04},
+	{0x4809, 0x04},
+	{0x480c, 0x12},
+	{0x4819, 0x70},
+	{0x4825, 0x32},
+	{0x4826, 0x32},
+	{0x482a, 0x06},
+	{0x4833, 0x08},
+	{0x4837, 0x0d},
+	{0x5000, 0x77},
+	{0x5b00, 0x01},
+	{0x5b01, 0x10},
+	{0x5b02, 0x01},
+	{0x5b03, 0xdb},
+	{0x5b05, 0x6c},
+	{0x5e10, 0xfc},
+	{0x3500, 0x00},
+	{0x3501, 0x3E},
+	{0x3502, 0x60},
+	{0x3503, 0x08},
+	{0x3508, 0x04},
+	{0x3509, 0x00},
+	{0x3832, 0x48},
+	{0x5780, 0x3e},
+	{0x5781, 0x0f},
+	{0x5782, 0x44},
+	{0x5783, 0x02},
+	{0x5784, 0x01},
+	{0x5785, 0x01},
+	{0x5786, 0x00},
+	{0x5787, 0x04},
+	{0x5788, 0x02},
+	{0x5789, 0x0f},
+	{0x578a, 0xfd},
+	{0x578b, 0xf5},
+	{0x578c, 0xf5},
+	{0x578d, 0x03},
+	{0x578e, 0x08},
+	{0x578f, 0x0c},
+	{0x5790, 0x08},
+	{0x5791, 0x06},
+	{0x5792, 0x00},
+	{0x5793, 0x52},
+	{0x5794, 0xa3},
+	{0x4003, 0x40},
+	{0x3107, 0x01},
+	{0x3c80, 0x08},
+	{0x3c83, 0xb1},
+	{0x3c8c, 0x10},
+	{0x3c8d, 0x00},
+	{0x3c90, 0x00},
+	{0x3c94, 0x00},
+	{0x3c95, 0x00},
+	{0x3c96, 0x00},
+	{0x37cb, 0x09},
+	{0x37cc, 0x15},
+	{0x37cd, 0x1f},
+	{0x37ce, 0x1f},
+};
+
+static const struct ov5675_reg mode_1296x972_regs[] = {
+	{0x3002, 0x21},
+	{0x3107, 0x23},
+	{0x3501, 0x20},
+	{0x3503, 0x0c},
+	{0x3508, 0x03},
+	{0x3509, 0x00},
+	{0x3600, 0x66},
+	{0x3602, 0x30},
+	{0x3610, 0xa5},
+	{0x3612, 0x93},
+	{0x3620, 0x80},
+	{0x3642, 0x0e},
+	{0x3661, 0x00},
+	{0x3662, 0x08},
+	{0x3664, 0xf3},
+	{0x3665, 0x9e},
+	{0x3667, 0xa5},
+	{0x366e, 0x55},
+	{0x366f, 0x55},
+	{0x3670, 0x11},
+	{0x3671, 0x11},
+	{0x3672, 0x11},
+	{0x3673, 0x11},
+	{0x3714, 0x28},
+	{0x371a, 0x3e},
+	{0x3733, 0x10},
+	{0x3734, 0x00},
+	{0x373d, 0x24},
+	{0x3764, 0x20},
+	{0x3765, 0x20},
+	{0x3766, 0x12},
+	{0x37a1, 0x14},
+	{0x37a8, 0x1c},
+	{0x37ab, 0x0f},
+	{0x37c2, 0x14},
+	{0x37cb, 0x00},
+	{0x37cc, 0x00},
+	{0x37cd, 0x00},
+	{0x37ce, 0x00},
+	{0x37d8, 0x02},
+	{0x37d9, 0x04},
+	{0x37dc, 0x04},
+	{0x3800, 0x00},
+	{0x3801, 0x00},
+	{0x3802, 0x00},
+	{0x3803, 0xf4},
+	{0x3804, 0x0a},
+	{0x3805, 0x3f},
+	{0x3806, 0x06},
+	{0x3807, 0xb3},
+	{0x3808, 0x05},
+	{0x3809, 0x00},
+	{0x380a, 0x02},
+	{0x380b, 0xd0},
+	{0x380c, 0x02},
+	{0x380d, 0xee},
+	{0x380e, 0x07},
+	{0x380f, 0xe4},
+	{0x3811, 0x10},
+	{0x3813, 0x09},
+	{0x3814, 0x03},
+	{0x3815, 0x01},
+	{0x3816, 0x03},
+	{0x3817, 0x01},
+	{0x381e, 0x02},
+	{0x3820, 0x8b},
+	{0x3821, 0x01},
+	{0x3832, 0x04},
+	{0x3c80, 0x01},
+	{0x3c82, 0x00},
+	{0x3c83, 0xc8},
+	{0x3c8c, 0x0f},
+	{0x3c8d, 0xa0},
+	{0x3c90, 0x07},
+	{0x3c91, 0x00},
+	{0x3c92, 0x00},
+	{0x3c93, 0x00},
+	{0x3c94, 0xd0},
+	{0x3c95, 0x50},
+	{0x3c96, 0x35},
+	{0x3c97, 0x00},
+	{0x4001, 0xe0},
+	{0x4008, 0x00},
+	{0x4009, 0x07},
+	{0x400f, 0x80},
+	{0x4013, 0x02},
+	{0x4040, 0x00},
+	{0x4041, 0x03},
+	{0x404c, 0x50},
+	{0x404e, 0x20},
+	{0x4500, 0x06},
+	{0x4503, 0x00},
+	{0x450a, 0x04},
+	{0x4809, 0x04},
+	{0x480c, 0x12},
+	{0x4819, 0x70},
+	{0x4825, 0x32},
+	{0x4826, 0x32},
+	{0x482a, 0x06},
+	{0x4833, 0x08},
+	{0x4837, 0x0d},
+	{0x5000, 0x77},
+	{0x5b00, 0x01},
+	{0x5b01, 0x10},
+	{0x5b02, 0x01},
+	{0x5b03, 0xdb},
+	{0x5b05, 0x6c},
+	{0x5e10, 0xfc},
+	{0x3500, 0x00},
+	{0x3501, 0x1F},
+	{0x3502, 0x20},
+	{0x3503, 0x08},
+	{0x3508, 0x04},
+	{0x3509, 0x00},
+	{0x3832, 0x48},
+	{0x5780, 0x3e},
+	{0x5781, 0x0f},
+	{0x5782, 0x44},
+	{0x5783, 0x02},
+	{0x5784, 0x01},
+	{0x5785, 0x01},
+	{0x5786, 0x00},
+	{0x5787, 0x04},
+	{0x5788, 0x02},
+	{0x5789, 0x0f},
+	{0x578a, 0xfd},
+	{0x578b, 0xf5},
+	{0x578c, 0xf5},
+	{0x578d, 0x03},
+	{0x578e, 0x08},
+	{0x578f, 0x0c},
+	{0x5790, 0x08},
+	{0x5791, 0x06},
+	{0x5792, 0x00},
+	{0x5793, 0x52},
+	{0x5794, 0xa3},
+	{0x4003, 0x40},
+	{0x3107, 0x01},
+	{0x3c80, 0x08},
+	{0x3c83, 0xb1},
+	{0x3c8c, 0x10},
+	{0x3c8d, 0x00},
+	{0x3c90, 0x00},
+	{0x3c94, 0x00},
+	{0x3c95, 0x00},
+	{0x3c96, 0x00},
+	{0x37cb, 0x09},
+	{0x37cc, 0x15},
+	{0x37cd, 0x1f},
+	{0x37ce, 0x1f},
+};
+
+static const char * const ov5675_test_pattern_menu[] = {
+	"Disabled",
+	"Standard Color Bar",
+	"Top-Bottom Darker Color Bar",
+	"Right-Left Darker Color Bar",
+	"Bottom-Top Darker Color Bar"
+};
+
+static const s64 link_freq_menu_items[] = {
+	OV5675_LINK_FREQ_450MHZ,
+};
+
+static const struct ov5675_link_freq_config link_freq_configs[] = {
+	[OV5675_LINK_FREQ_900MBPS] = {
+		.reg_list = {
+			.num_of_regs = ARRAY_SIZE(mipi_data_rate_900mbps),
+			.regs = mipi_data_rate_900mbps,
+		}
+	}
+};
+
+static const struct ov5675_mode supported_modes[] = {
+	{
+		.width = 2592,
+		.height = 1944,
+		.hts = 1500,
+		.vts_def = OV5675_VTS_30FPS,
+		.vts_min = OV5675_VTS_30FPS_MIN,
+		.reg_list = {
+			.num_of_regs = ARRAY_SIZE(mode_2592x1944_regs),
+			.regs = mode_2592x1944_regs,
+		},
+		.link_freq_index = OV5675_LINK_FREQ_900MBPS,
+	},
+	{
+		.width = 1296,
+		.height = 972,
+		.hts = 1500,
+		.vts_def = OV5675_VTS_30FPS,
+		.vts_min = OV5675_VTS_30FPS_MIN,
+		.reg_list = {
+			.num_of_regs = ARRAY_SIZE(mode_1296x972_regs),
+			.regs = mode_1296x972_regs,
+		},
+		.link_freq_index = OV5675_LINK_FREQ_900MBPS,
+	}
+};
+
+struct ov5675 {
+	struct v4l2_subdev sd;
+	struct media_pad pad;
+	struct v4l2_ctrl_handler ctrl_handler;
+
+	/* V4L2 Controls */
+	struct v4l2_ctrl *link_freq;
+	struct v4l2_ctrl *pixel_rate;
+	struct v4l2_ctrl *vblank;
+	struct v4l2_ctrl *hblank;
+	struct v4l2_ctrl *exposure;
+
+	/* Current mode */
+	const struct ov5675_mode *cur_mode;
+
+	/* To serialize asynchronus callbacks */
+	struct mutex mutex;
+
+	/* Streaming on/off */
+	bool streaming;
+};
+
+static u64 to_pixel_rate(u32 f_index)
+{
+	u64 pixel_rate = link_freq_menu_items[f_index] * 2 * OV5675_DATA_LANES;
+
+	do_div(pixel_rate, OV5675_RGB_DEPTH);
+
+	return pixel_rate;
+}
+
+static u64 to_pixels_per_line(u32 hts, u32 f_index)
+{
+	u64 ppl = hts * to_pixel_rate(f_index);
+
+	do_div(ppl, OV5675_SCLK);
+
+	return ppl;
+}
+
+static int ov5675_read_reg(struct ov5675 *ov5675, u16 reg, u16 len, u32 *val)
+{
+	struct i2c_client *client = v4l2_get_subdevdata(&ov5675->sd);
+	struct i2c_msg msgs[2];
+	u8 addr_buf[2];
+	u8 data_buf[4] = {0};
+	int ret;
+
+	if (len > 4)
+		return -EINVAL;
+
+	put_unaligned_be16(reg, addr_buf);
+	msgs[0].addr = client->addr;
+	msgs[0].flags = 0;
+	msgs[0].len = sizeof(addr_buf);
+	msgs[0].buf = addr_buf;
+	msgs[1].addr = client->addr;
+	msgs[1].flags = I2C_M_RD;
+	msgs[1].len = len;
+	msgs[1].buf = &data_buf[4 - len];
+
+	ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
+	if (ret != ARRAY_SIZE(msgs))
+		return -EIO;
+
+	*val = get_unaligned_be32(data_buf);
+
+	return 0;
+}
+
+static int ov5675_write_reg(struct ov5675 *ov5675, u16 reg, u16 len, u32 val)
+{
+	struct i2c_client *client = v4l2_get_subdevdata(&ov5675->sd);
+	u8 buf[6];
+
+	if (len > 4)
+		return -EINVAL;
+
+	put_unaligned_be16(reg, buf);
+	put_unaligned_be32(val << 8 * (4 - len), buf + 2);
+	if (i2c_master_send(client, buf, len + 2) != len + 2)
+		return -EIO;
+
+	return 0;
+}
+
+static int ov5675_write_reg_list(struct ov5675 *ov5675,
+				 const struct ov5675_reg_list *r_list)
+{
+	struct i2c_client *client = v4l2_get_subdevdata(&ov5675->sd);
+	unsigned int i;
+	int ret;
+
+	for (i = 0; i < r_list->num_of_regs; i++) {
+		ret = ov5675_write_reg(ov5675, r_list->regs[i].address, 1,
+				       r_list->regs[i].val);
+		if (ret) {
+			dev_err_ratelimited(&client->dev,
+				    "failed to write reg 0x%4.4x. error = %d",
+				    r_list->regs[i].address, ret);
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
+static int ov5675_update_digital_gain(struct ov5675 *ov5675, u32 d_gain)
+{
+	int ret;
+
+	ret = ov5675_write_reg(ov5675, OV5675_REG_MWB_R_GAIN,
+			       OV5675_REG_VALUE_16BIT, d_gain);
+	if (ret)
+		return ret;
+
+	ret = ov5675_write_reg(ov5675, OV5675_REG_MWB_G_GAIN,
+			       OV5675_REG_VALUE_16BIT, d_gain);
+	if (ret)
+		return ret;
+
+	return ov5675_write_reg(ov5675, OV5675_REG_MWB_B_GAIN,
+				OV5675_REG_VALUE_16BIT, d_gain);
+}
+
+static int ov5675_test_pattern(struct ov5675 *ov5675, u32 pattern)
+{
+	if (pattern)
+		pattern = (pattern - 1) << OV5675_TEST_PATTERN_BAR_SHIFT |
+			  OV5675_TEST_PATTERN_ENABLE;
+
+	return ov5675_write_reg(ov5675, OV5675_REG_TEST_PATTERN,
+				OV5675_REG_VALUE_08BIT, pattern);
+}
+
+static int ov5675_set_ctrl(struct v4l2_ctrl *ctrl)
+{
+	struct ov5675 *ov5675 = container_of(ctrl->handler,
+					     struct ov5675, ctrl_handler);
+	struct i2c_client *client = v4l2_get_subdevdata(&ov5675->sd);
+	s64 exposure_max;
+	int ret = 0;
+
+	/* Propagate change of current control to all related controls */
+	if (ctrl->id == V4L2_CID_VBLANK) {
+		/* Update max exposure while meeting expected vblanking */
+		exposure_max = (ov5675->cur_mode->height + ctrl->val -
+			       OV5675_EXPOSURE_MAX_MARGIN)/2;
+		__v4l2_ctrl_modify_range(ov5675->exposure,
+					 ov5675->exposure->minimum,
+					 exposure_max, ov5675->exposure->step,
+					 exposure_max);
+	}
+
+	/* V4L2 controls values will be applied only when power is already up */
+	if (!pm_runtime_get_if_in_use(&client->dev))
+		return 0;
+
+	switch (ctrl->id) {
+	case V4L2_CID_ANALOGUE_GAIN:
+		ret = ov5675_write_reg(ov5675, OV5675_REG_ANALOG_GAIN,
+				       OV5675_REG_VALUE_16BIT, ctrl->val);
+		break;
+
+	case V4L2_CID_DIGITAL_GAIN:
+		ret = ov5675_update_digital_gain(ov5675, ctrl->val);
+		break;
+
+	case V4L2_CID_EXPOSURE:
+		/* 3 least significant bits of expsoure are fractional part */
+		ret = ov5675_write_reg(ov5675, OV5675_REG_EXPOSURE,
+				       OV5675_REG_VALUE_24BIT, ctrl->val << 3);
+		break;
+
+	case V4L2_CID_VBLANK:
+		ret = ov5675_write_reg(ov5675, OV5675_REG_VTS,
+				       OV5675_REG_VALUE_16BIT,
+				       ov5675->cur_mode->height + ctrl->val +
+				       10);
+		break;
+
+	case V4L2_CID_TEST_PATTERN:
+		ret = ov5675_test_pattern(ov5675, ctrl->val);
+		break;
+
+	default:
+		ret = -EINVAL;
+		break;
+	}
+
+	pm_runtime_put(&client->dev);
+
+	return ret;
+}
+
+static const struct v4l2_ctrl_ops ov5675_ctrl_ops = {
+	.s_ctrl = ov5675_set_ctrl,
+};
+
+static int ov5675_init_controls(struct ov5675 *ov5675)
+{
+	struct v4l2_ctrl_handler *ctrl_hdlr;
+	s64 exposure_max, h_blank;
+	int ret;
+
+	ctrl_hdlr = &ov5675->ctrl_handler;
+	ret = v4l2_ctrl_handler_init(ctrl_hdlr, 8);
+	if (ret)
+		return ret;
+
+	ctrl_hdlr->lock = &ov5675->mutex;
+	ov5675->link_freq = v4l2_ctrl_new_int_menu(ctrl_hdlr, &ov5675_ctrl_ops,
+					   V4L2_CID_LINK_FREQ,
+					   ARRAY_SIZE(link_freq_menu_items) - 1,
+					   0, link_freq_menu_items);
+	if (ov5675->link_freq)
+		ov5675->link_freq->flags |= V4L2_CTRL_FLAG_READ_ONLY;
+
+	ov5675->pixel_rate = v4l2_ctrl_new_std(ctrl_hdlr, &ov5675_ctrl_ops,
+				       V4L2_CID_PIXEL_RATE, 0,
+				       to_pixel_rate(OV5675_LINK_FREQ_900MBPS),
+				       1,
+				       to_pixel_rate(OV5675_LINK_FREQ_900MBPS));
+	ov5675->vblank = v4l2_ctrl_new_std(ctrl_hdlr, &ov5675_ctrl_ops,
+			  V4L2_CID_VBLANK,
+			  ov5675->cur_mode->vts_min - ov5675->cur_mode->height,
+			  OV5675_VTS_MAX - ov5675->cur_mode->height, 1,
+			  ov5675->cur_mode->vts_def - ov5675->cur_mode->height);
+	h_blank = to_pixels_per_line(ov5675->cur_mode->hts,
+		  ov5675->cur_mode->link_freq_index) - ov5675->cur_mode->width;
+	ov5675->hblank = v4l2_ctrl_new_std(ctrl_hdlr, &ov5675_ctrl_ops,
+					   V4L2_CID_HBLANK, h_blank, h_blank, 1,
+					   h_blank);
+	if (ov5675->hblank)
+		ov5675->hblank->flags |= V4L2_CTRL_FLAG_READ_ONLY;
+
+	v4l2_ctrl_new_std(ctrl_hdlr, &ov5675_ctrl_ops, V4L2_CID_ANALOGUE_GAIN,
+			  OV5675_ANAL_GAIN_MIN, OV5675_ANAL_GAIN_MAX,
+			  OV5675_ANAL_GAIN_STEP, OV5675_ANAL_GAIN_MIN);
+	v4l2_ctrl_new_std(ctrl_hdlr, &ov5675_ctrl_ops, V4L2_CID_DIGITAL_GAIN,
+			  OV5675_DGTL_GAIN_MIN, OV5675_DGTL_GAIN_MAX,
+			  OV5675_DGTL_GAIN_STEP, OV5675_DGTL_GAIN_DEFAULT);
+	exposure_max = (ov5675->cur_mode->vts_def -
+			OV5675_EXPOSURE_MAX_MARGIN)/2;
+	ov5675->exposure = v4l2_ctrl_new_std(ctrl_hdlr, &ov5675_ctrl_ops,
+					     V4L2_CID_EXPOSURE,
+					     OV5675_EXPOSURE_MIN, exposure_max,
+					     OV5675_EXPOSURE_STEP,
+					     exposure_max);
+	v4l2_ctrl_new_std_menu_items(ctrl_hdlr, &ov5675_ctrl_ops,
+				     V4L2_CID_TEST_PATTERN,
+				     ARRAY_SIZE(ov5675_test_pattern_menu) - 1,
+				     0, 0, ov5675_test_pattern_menu);
+	if (ctrl_hdlr->error)
+		return ctrl_hdlr->error;
+
+	ov5675->sd.ctrl_handler = ctrl_hdlr;
+
+	return 0;
+}
+
+static void ov5675_update_pad_format(const struct ov5675_mode *mode,
+				     struct v4l2_mbus_framefmt *fmt)
+{
+	fmt->width = mode->width;
+	fmt->height = mode->height;
+	fmt->code = MEDIA_BUS_FMT_SGRBG10_1X10;
+	fmt->field = V4L2_FIELD_NONE;
+}
+
+static int ov5675_start_streaming(struct ov5675 *ov5675)
+{
+	struct i2c_client *client = v4l2_get_subdevdata(&ov5675->sd);
+	const struct ov5675_reg_list *reg_list;
+	int link_freq_index, ret;
+
+	link_freq_index = ov5675->cur_mode->link_freq_index;
+	reg_list = &link_freq_configs[link_freq_index].reg_list;
+	ret = ov5675_write_reg_list(ov5675, reg_list);
+	if (ret) {
+		dev_err(&client->dev, "failed to set plls");
+		return ret;
+	}
+
+	reg_list = &ov5675->cur_mode->reg_list;
+	ret = ov5675_write_reg_list(ov5675, reg_list);
+	if (ret) {
+		dev_err(&client->dev, "failed to set mode");
+		return ret;
+	}
+
+	ret = __v4l2_ctrl_handler_setup(ov5675->sd.ctrl_handler);
+	if (ret)
+		return ret;
+
+	ret = ov5675_write_reg(ov5675, OV5675_REG_MODE_SELECT,
+			       OV5675_REG_VALUE_08BIT, OV5675_MODE_STREAMING);
+	if (ret) {
+		dev_err(&client->dev, "failed to set stream");
+		return ret;
+	}
+
+	return 0;
+}
+
+static void ov5675_stop_streaming(struct ov5675 *ov5675)
+{
+	struct i2c_client *client = v4l2_get_subdevdata(&ov5675->sd);
+
+	if (ov5675_write_reg(ov5675, OV5675_REG_MODE_SELECT,
+			     OV5675_REG_VALUE_08BIT, OV5675_MODE_STANDBY))
+		dev_err(&client->dev, "failed to set stream");
+}
+
+static int ov5675_set_stream(struct v4l2_subdev *sd, int enable)
+{
+	struct ov5675 *ov5675 = to_ov5675(sd);
+	struct i2c_client *client = v4l2_get_subdevdata(sd);
+	int ret = 0;
+
+	if (ov5675->streaming == enable)
+		return 0;
+
+	mutex_lock(&ov5675->mutex);
+	if (enable) {
+		ret = pm_runtime_get_sync(&client->dev);
+		if (ret < 0) {
+			pm_runtime_put_noidle(&client->dev);
+			mutex_unlock(&ov5675->mutex);
+			return ret;
+		}
+
+		ret = ov5675_start_streaming(ov5675);
+		if (ret) {
+			enable = 0;
+			ov5675_stop_streaming(ov5675);
+			pm_runtime_put(&client->dev);
+		}
+	} else {
+		ov5675_stop_streaming(ov5675);
+		pm_runtime_put(&client->dev);
+	}
+
+	ov5675->streaming = enable;
+	mutex_unlock(&ov5675->mutex);
+
+	return ret;
+}
+
+static int __maybe_unused ov5675_suspend(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct v4l2_subdev *sd = i2c_get_clientdata(client);
+	struct ov5675 *ov5675 = to_ov5675(sd);
+
+	mutex_lock(&ov5675->mutex);
+	if (ov5675->streaming)
+		ov5675_stop_streaming(ov5675);
+
+	mutex_unlock(&ov5675->mutex);
+
+	return 0;
+}
+
+static int __maybe_unused ov5675_resume(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct v4l2_subdev *sd = i2c_get_clientdata(client);
+	struct ov5675 *ov5675 = to_ov5675(sd);
+	int ret;
+
+	mutex_lock(&ov5675->mutex);
+	if (ov5675->streaming) {
+		ret = ov5675_start_streaming(ov5675);
+		if (ret) {
+			ov5675->streaming = false;
+			ov5675_stop_streaming(ov5675);
+			mutex_unlock(&ov5675->mutex);
+			return ret;
+		}
+	}
+
+	mutex_unlock(&ov5675->mutex);
+
+	return 0;
+}
+
+static int ov5675_set_format(struct v4l2_subdev *sd,
+			     struct v4l2_subdev_pad_config *cfg,
+			     struct v4l2_subdev_format *fmt)
+{
+	struct ov5675 *ov5675 = to_ov5675(sd);
+	const struct ov5675_mode *mode;
+	s32 vblank_def, h_blank;
+
+	mode = v4l2_find_nearest_size(supported_modes,
+				      ARRAY_SIZE(supported_modes), width,
+				      height, fmt->format.width,
+				      fmt->format.height);
+
+	mutex_lock(&ov5675->mutex);
+	ov5675_update_pad_format(mode, &fmt->format);
+	if (fmt->which == V4L2_SUBDEV_FORMAT_TRY) {
+		*v4l2_subdev_get_try_format(sd, cfg, fmt->pad) = fmt->format;
+	} else {
+		ov5675->cur_mode = mode;
+		__v4l2_ctrl_s_ctrl(ov5675->link_freq, mode->link_freq_index);
+		__v4l2_ctrl_s_ctrl_int64(ov5675->pixel_rate,
+					 to_pixel_rate(mode->link_freq_index));
+
+		/* Update limits and set FPS to default */
+		vblank_def = mode->vts_def - mode->height;
+		__v4l2_ctrl_modify_range(ov5675->vblank,
+					 mode->vts_min - mode->height,
+					 OV5675_VTS_MAX - mode->height, 1,
+					 vblank_def);
+		__v4l2_ctrl_s_ctrl(ov5675->vblank, vblank_def);
+		h_blank = to_pixels_per_line(mode->hts, mode->link_freq_index) -
+			  mode->width;
+		__v4l2_ctrl_modify_range(ov5675->hblank, h_blank, h_blank, 1,
+					 h_blank);
+	}
+
+	mutex_unlock(&ov5675->mutex);
+
+	return 0;
+}
+
+static int ov5675_get_format(struct v4l2_subdev *sd,
+			     struct v4l2_subdev_pad_config *cfg,
+			     struct v4l2_subdev_format *fmt)
+{
+	struct ov5675 *ov5675 = to_ov5675(sd);
+
+	mutex_lock(&ov5675->mutex);
+	if (fmt->which == V4L2_SUBDEV_FORMAT_TRY)
+		fmt->format = *v4l2_subdev_get_try_format(&ov5675->sd, cfg,
+							  fmt->pad);
+	else
+		ov5675_update_pad_format(ov5675->cur_mode, &fmt->format);
+
+	mutex_unlock(&ov5675->mutex);
+
+	return 0;
+}
+
+static int ov5675_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_SGRBG10_1X10;
+
+	return 0;
+}
+
+static int ov5675_enum_frame_size(struct v4l2_subdev *sd,
+				  struct v4l2_subdev_pad_config *cfg,
+				  struct v4l2_subdev_frame_size_enum *fse)
+{
+	if (fse->index >= ARRAY_SIZE(supported_modes))
+		return -EINVAL;
+
+	if (fse->code != MEDIA_BUS_FMT_SGRBG10_1X10)
+		return -EINVAL;
+
+	fse->min_width = supported_modes[fse->index].width;
+	fse->max_width = fse->min_width;
+	fse->min_height = supported_modes[fse->index].height;
+	fse->max_height = fse->min_height;
+
+	return 0;
+}
+
+static int ov5675_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
+{
+	struct ov5675 *ov5675 = to_ov5675(sd);
+
+	mutex_lock(&ov5675->mutex);
+	ov5675_update_pad_format(&supported_modes[0],
+				 v4l2_subdev_get_try_format(sd, fh->pad, 0));
+	mutex_unlock(&ov5675->mutex);
+
+	return 0;
+}
+
+static const struct v4l2_subdev_video_ops ov5675_video_ops = {
+	.s_stream = ov5675_set_stream,
+};
+
+static const struct v4l2_subdev_pad_ops ov5675_pad_ops = {
+	.set_fmt = ov5675_set_format,
+	.get_fmt = ov5675_get_format,
+	.enum_mbus_code = ov5675_enum_mbus_code,
+	.enum_frame_size = ov5675_enum_frame_size,
+};
+
+static const struct v4l2_subdev_ops ov5675_subdev_ops = {
+	.video = &ov5675_video_ops,
+	.pad = &ov5675_pad_ops,
+};
+
+static const struct media_entity_operations ov5675_subdev_entity_ops = {
+	.link_validate = v4l2_subdev_link_validate,
+};
+
+static const struct v4l2_subdev_internal_ops ov5675_internal_ops = {
+	.open = ov5675_open,
+};
+
+static int ov5675_identify_module(struct ov5675 *ov5675)
+{
+	struct i2c_client *client = v4l2_get_subdevdata(&ov5675->sd);
+	int ret;
+	u32 val;
+
+	ret = ov5675_read_reg(ov5675, OV5675_REG_CHIP_ID,
+			      OV5675_REG_VALUE_24BIT, &val);
+	if (ret)
+		return ret;
+
+	if (val != OV5675_CHIP_ID) {
+		dev_err(&client->dev, "chip id mismatch: %x!=%x",
+			OV5675_CHIP_ID, val);
+		return -ENXIO;
+	}
+
+	return 0;
+}
+
+static int ov5675_check_hwcfg(struct device *dev)
+{
+	struct fwnode_handle *ep;
+	struct fwnode_handle *fwnode = dev_fwnode(dev);
+	struct v4l2_fwnode_endpoint bus_cfg = {
+		.bus_type = V4L2_MBUS_CSI2_DPHY
+	};
+	u32 mclk;
+	int ret;
+	unsigned int i, j;
+
+	if (!fwnode)
+		return -ENXIO;
+
+	ret = fwnode_property_read_u32(fwnode, "clock-frequency", &mclk);
+
+	if (ret) {
+		dev_err(dev, "can't get clock frequency");
+		return ret;
+	}
+
+	if (mclk != OV5675_MCLK) {
+		dev_err(dev, "external clock %d is not supported", mclk);
+		return -EINVAL;
+	}
+
+	ep = fwnode_graph_get_next_endpoint(fwnode, NULL);
+	if (!ep)
+		return -ENXIO;
+
+	ret = v4l2_fwnode_endpoint_alloc_parse(ep, &bus_cfg);
+	fwnode_handle_put(ep);
+	if (ret)
+		return ret;
+
+	if (bus_cfg.bus.mipi_csi2.num_data_lanes != OV5675_DATA_LANES) {
+		dev_err(dev, "number of CSI2 data lanes %d is not supported",
+			bus_cfg.bus.mipi_csi2.num_data_lanes);
+		ret = -EINVAL;
+		goto check_hwcfg_error;
+	}
+
+	if (!bus_cfg.nr_of_link_frequencies) {
+		dev_err(dev, "no link frequencies defined");
+		ret = -EINVAL;
+		goto check_hwcfg_error;
+	}
+
+	for (i = 0; i < ARRAY_SIZE(link_freq_menu_items); i++) {
+		for (j = 0; j < bus_cfg.nr_of_link_frequencies; j++) {
+			if (link_freq_menu_items[i] ==
+				bus_cfg.link_frequencies[j])
+				break;
+		}
+
+		if (j == bus_cfg.nr_of_link_frequencies) {
+			dev_err(dev, "no link frequency %lld supported",
+				link_freq_menu_items[i]);
+			ret = -EINVAL;
+			goto check_hwcfg_error;
+		}
+	}
+
+check_hwcfg_error:
+	v4l2_fwnode_endpoint_free(&bus_cfg);
+
+	return ret;
+}
+
+static int ov5675_remove(struct i2c_client *client)
+{
+	struct v4l2_subdev *sd = i2c_get_clientdata(client);
+	struct ov5675 *ov5675 = to_ov5675(sd);
+
+	v4l2_async_unregister_subdev(sd);
+	media_entity_cleanup(&sd->entity);
+	v4l2_ctrl_handler_free(sd->ctrl_handler);
+	pm_runtime_disable(&client->dev);
+	mutex_destroy(&ov5675->mutex);
+
+	return 0;
+}
+
+static int ov5675_probe(struct i2c_client *client)
+{
+	struct ov5675 *ov5675;
+	int ret;
+
+	ret = ov5675_check_hwcfg(&client->dev);
+	if (ret) {
+		dev_err(&client->dev, "failed to check HW configuration: %d",
+			ret);
+		return ret;
+	}
+
+	ov5675 = devm_kzalloc(&client->dev, sizeof(*ov5675), GFP_KERNEL);
+	if (!ov5675)
+		return -ENOMEM;
+
+	v4l2_i2c_subdev_init(&ov5675->sd, client, &ov5675_subdev_ops);
+	ret = ov5675_identify_module(ov5675);
+	if (ret) {
+		dev_err(&client->dev, "failed to find sensor: %d", ret);
+		return ret;
+	}
+
+	mutex_init(&ov5675->mutex);
+	ov5675->cur_mode = &supported_modes[0];
+	ret = ov5675_init_controls(ov5675);
+	if (ret) {
+		dev_err(&client->dev, "failed to init controls: %d", ret);
+		goto probe_error_v4l2_ctrl_handler_free;
+	}
+
+	ov5675->sd.internal_ops = &ov5675_internal_ops;
+	ov5675->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
+	ov5675->sd.entity.ops = &ov5675_subdev_entity_ops;
+	ov5675->sd.entity.function = MEDIA_ENT_F_CAM_SENSOR;
+	ov5675->pad.flags = MEDIA_PAD_FL_SOURCE;
+	ret = media_entity_pads_init(&ov5675->sd.entity, 1, &ov5675->pad);
+	if (ret) {
+		dev_err(&client->dev, "failed to init entity pads: %d", ret);
+		goto probe_error_v4l2_ctrl_handler_free;
+	}
+
+	ret = v4l2_async_register_subdev_sensor_common(&ov5675->sd);
+	if (ret < 0) {
+		dev_err(&client->dev, "failed to register V4L2 subdev: %d",
+			ret);
+		goto probe_error_media_entity_cleanup;
+	}
+
+	/*
+	 * Device is already turned on by i2c-core with ACPI domain PM.
+	 * Enable runtime PM and turn off the device.
+	 */
+	pm_runtime_set_active(&client->dev);
+	pm_runtime_enable(&client->dev);
+	pm_runtime_idle(&client->dev);
+
+	return 0;
+
+probe_error_media_entity_cleanup:
+	media_entity_cleanup(&ov5675->sd.entity);
+
+probe_error_v4l2_ctrl_handler_free:
+	v4l2_ctrl_handler_free(ov5675->sd.ctrl_handler);
+	mutex_destroy(&ov5675->mutex);
+
+	return ret;
+}
+
+static const struct dev_pm_ops ov5675_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(ov5675_suspend, ov5675_resume)
+};
+
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id ov5675_acpi_ids[] = {
+	{"OVTI5675"},
+	{}
+};
+
+MODULE_DEVICE_TABLE(acpi, ov5675_acpi_ids);
+#endif
+
+static struct i2c_driver ov5675_i2c_driver = {
+	.driver = {
+		.name = "ov5675",
+		.pm = &ov5675_pm_ops,
+		.acpi_match_table = ACPI_PTR(ov5675_acpi_ids),
+	},
+	.probe_new = ov5675_probe,
+	.remove = ov5675_remove,
+};
+
+module_i2c_driver(ov5675_i2c_driver);
+
+MODULE_AUTHOR("Shawn Tu <shawnx.tu@intel.com>");
+MODULE_DESCRIPTION("OmniVision OV5675 sensor driver");
+MODULE_LICENSE("GPL v2");
-- 
2.7.4