[PATCH v2 3/4] media: ov2685: add support for OV2685 sensor

[Shunqian Zheng <zhengsq-TNX95d0MmH7DzftRWevZcw@public.gmane.org>]

This patch adds driver for Omnivision's ov2685 sensor.
Though the ov2685 can output yuv data, this driver only
supports the raw bayer format, including the following features:
  - output 1600x1200 at 30fps
  - test patterns
  - manual exposure/gain control
  - vblank and hblank
  - media controller
  - runtime pm

Signed-off-by: Shunqian Zheng <zhengsq-TNX95d0MmH7DzftRWevZcw@public.gmane.org>
---
 drivers/media/i2c/Kconfig  |  12 +
 drivers/media/i2c/Makefile |   1 +
 drivers/media/i2c/ov2685.c | 841 +++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 854 insertions(+)
 create mode 100644 drivers/media/i2c/ov2685.c

diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
index 55b37c8..63a175d 100644
--- a/drivers/media/i2c/Kconfig
+++ b/drivers/media/i2c/Kconfig
@@ -586,6 +586,18 @@ config VIDEO_OV2659
 	  To compile this driver as a module, choose M here: the
 	  module will be called ov2659.
 
+config VIDEO_OV2685
+	tristate "OmniVision OV2685 sensor support"
+	depends on VIDEO_V4L2 && I2C && MEDIA_CONTROLLER
+	depends on MEDIA_CAMERA_SUPPORT
+	select V4L2_FWNODE
+	---help---
+	  This is a Video4Linux2 sensor-level driver for the OmniVision
+	  OV2685 camera.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called ov2685.
+
 config VIDEO_OV5640
 	tristate "OmniVision OV5640 sensor support"
 	depends on OF
diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile
index a063030..3054c69 100644
--- a/drivers/media/i2c/Makefile
+++ b/drivers/media/i2c/Makefile
@@ -61,6 +61,7 @@ obj-$(CONFIG_VIDEO_SONY_BTF_MPX) += sony-btf-mpx.o
 obj-$(CONFIG_VIDEO_UPD64031A) += upd64031a.o
 obj-$(CONFIG_VIDEO_UPD64083) += upd64083.o
 obj-$(CONFIG_VIDEO_OV2640) += ov2640.o
+obj-$(CONFIG_VIDEO_OV2685) += ov2685.o
 obj-$(CONFIG_VIDEO_OV5640) += ov5640.o
 obj-$(CONFIG_VIDEO_OV5645) += ov5645.o
 obj-$(CONFIG_VIDEO_OV5647) += ov5647.o
diff --git a/drivers/media/i2c/ov2685.c b/drivers/media/i2c/ov2685.c
new file mode 100644
index 0000000..e037d20
--- /dev/null
+++ b/drivers/media/i2c/ov2685.c
@@ -0,0 +1,841 @@
+/*
+ * ov2685 driver
+ *
+ * Copyright (C) 2017 Fuzhou Rockchip Electronics Co., Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/clk.h>
+#include <linux/device.h>
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/pm_runtime.h>
+#include <linux/regulator/consumer.h>
+#include <linux/sysfs.h>
+#include <media/media-entity.h>
+#include <media/v4l2-async.h>
+#include <media/v4l2-ctrls.h>
+#include <media/v4l2-subdev.h>
+
+#define CHIP_ID				0x2685
+#define OV2685_REG_CHIP_ID		0x300a
+
+#define REG_SC_CTRL_MODE		0x0100
+#define     SC_CTRL_MODE_STANDBY	0x0
+#define     SC_CTRL_MODE_STREAMING	BIT(0)
+
+#define OV2685_REG_EXPOSURE		0x3500
+#define	OV2685_EXPOSURE_MIN		4
+#define	OV2685_EXPOSURE_STEP		1
+
+#define OV2685_REG_VTS			0x380e
+#define OV2685_VTS_MAX			0x7fff
+
+#define OV2685_REG_GAIN			0x350a
+#define OV2685_GAIN_MIN			0
+#define OV2685_GAIN_MAX			0x07ff
+#define OV2685_GAIN_STEP		0x1
+#define OV2685_GAIN_DEFAULT		0x0036
+
+#define OV2685_REG_TEST_PATTERN		0x5080
+#define OV2685_TEST_PATTERN_DISABLED		0x00
+#define OV2685_TEST_PATTERN_COLOR_BAR		0x80
+#define OV2685_TEST_PATTERN_RND			0x81
+#define OV2685_TEST_PATTERN_COLOR_BAR_FADE	0x88
+#define OV2685_TEST_PATTERN_BW_SQUARE		0x92
+#define OV2685_TEST_PATTERN_COLOR_SQUARE	0x82
+
+#define REG_NULL			0xFFFF
+
+#define OV2685_REG_VALUE_08BIT		1
+#define OV2685_REG_VALUE_16BIT		2
+#define OV2685_REG_VALUE_24BIT		3
+
+#define OV2685_LANES			1
+#define OV2685_BITS_PER_SAMPLE		10
+
+struct regval {
+	u16 addr;
+	u8 val;
+};
+
+struct ov2685_mode {
+	u32 width;
+	u32 height;
+	u32 exp_def;
+	u32 hts_def;
+	u32 vts_def;
+	const struct regval *reg_list;
+};
+
+struct ov2685 {
+	struct i2c_client	*client;
+	struct clk		*xvclk;
+	struct regulator	*avdd_regulator;	/* Analog power */
+	struct regulator	*dovdd_regulator;	/* Digital I/O power */
+				/* use internal DVDD power */
+	struct gpio_desc	*reset_gpio;
+
+	bool			streaming;
+	struct mutex		mutex;
+	struct v4l2_subdev	subdev;
+	struct media_pad	pad;
+	struct v4l2_ctrl	*anal_gain;
+	struct v4l2_ctrl	*exposure;
+	struct v4l2_ctrl	*hblank;
+	struct v4l2_ctrl	*vblank;
+	struct v4l2_ctrl	*test_pattern;
+	struct v4l2_ctrl_handler ctrl_handler;
+
+	const struct ov2685_mode *cur_mode;
+};
+#define to_ov2685(sd) container_of(sd, struct ov2685, subdev)
+
+/* PLL settings bases on 24M xvclk */
+static struct regval ov2685_1600x1200_regs[] = {
+	{0x0103, 0x01},
+	{0x0100, 0x00},
+	{0x3002, 0x00},
+	{0x3016, 0x1c},
+	{0x3018, 0x44},
+	{0x301d, 0xf0},
+	{0x3020, 0x00},
+	{0x3082, 0x37},
+	{0x3083, 0x03},
+	{0x3084, 0x09},
+	{0x3085, 0x04},
+	{0x3086, 0x00},
+	{0x3087, 0x00},
+	{0x3501, 0x4e},
+	{0x3502, 0xe0},
+	{0x3503, 0x07},
+	{0x350b, 0x36},
+	{0x3600, 0xb4},
+	{0x3603, 0x35},
+	{0x3604, 0x24},
+	{0x3605, 0x00},
+	{0x3620, 0x24},
+	{0x3621, 0x34},
+	{0x3622, 0x03},
+	{0x3628, 0x10},
+	{0x3705, 0x3c},
+	{0x370a, 0x21},
+	{0x370c, 0x50},
+	{0x370d, 0xc0},
+	{0x3717, 0x58},
+	{0x3718, 0x80},
+	{0x3720, 0x00},
+	{0x3721, 0x09},
+	{0x3722, 0x06},
+	{0x3723, 0x59},
+	{0x3738, 0x99},
+	{0x3781, 0x80},
+	{0x3784, 0x0c},
+	{0x3789, 0x60},
+	{0x3800, 0x00},
+	{0x3801, 0x00},
+	{0x3802, 0x00},
+	{0x3803, 0x00},
+	{0x3804, 0x06},
+	{0x3805, 0x4f},
+	{0x3806, 0x04},
+	{0x3807, 0xbf},
+	{0x3808, 0x06},
+	{0x3809, 0x40},
+	{0x380a, 0x04},
+	{0x380b, 0xb0},
+	{0x380c, 0x06},
+	{0x380d, 0xa4},
+	{0x380e, 0x05},
+	{0x380f, 0x0e},
+	{0x3810, 0x00},
+	{0x3811, 0x08},
+	{0x3812, 0x00},
+	{0x3813, 0x08},
+	{0x3814, 0x11},
+	{0x3815, 0x11},
+	{0x3819, 0x04},
+	{0x3820, 0xc0},
+	{0x3821, 0x00},
+	{0x3a06, 0x01},
+	{0x3a07, 0x84},
+	{0x3a08, 0x01},
+	{0x3a09, 0x43},
+	{0x3a0a, 0x24},
+	{0x3a0b, 0x60},
+	{0x3a0c, 0x28},
+	{0x3a0d, 0x60},
+	{0x3a0e, 0x04},
+	{0x3a0f, 0x8c},
+	{0x3a10, 0x05},
+	{0x3a11, 0x0c},
+	{0x4000, 0x81},
+	{0x4001, 0x40},
+	{0x4008, 0x02},
+	{0x4009, 0x09},
+	{0x4300, 0x00},
+	{0x430e, 0x00},
+	{0x4602, 0x02},
+	{0x481b, 0x40},
+	{0x481f, 0x40},
+	{0x4837, 0x18},
+	{0x5000, 0x1f},
+	{0x5001, 0x05},
+	{0x5002, 0x30},
+	{0x5003, 0x04},
+	{0x5004, 0x00},
+	{0x5005, 0x0c},
+	{0x5280, 0x15},
+	{0x5281, 0x06},
+	{0x5282, 0x06},
+	{0x5283, 0x08},
+	{0x5284, 0x1c},
+	{0x5285, 0x1c},
+	{0x5286, 0x20},
+	{0x5287, 0x10},
+	{REG_NULL, 0x00}
+};
+
+#define OV2685_LINK_FREQ_330MHZ		330000000
+static const s64 link_freq_menu_items[] = {
+	OV2685_LINK_FREQ_330MHZ
+};
+
+static const char * const ov2685_test_pattern_menu[] = {
+	"Disabled",
+	"Color Bar",
+	"RND PATTERN",
+	"Color Bar FADE",
+	"BW SQUARE",
+	"COLOR SQUARE"
+};
+
+static const int ov2685_test_pattern_val[] = {
+	OV2685_TEST_PATTERN_DISABLED,
+	OV2685_TEST_PATTERN_COLOR_BAR,
+	OV2685_TEST_PATTERN_RND,
+	OV2685_TEST_PATTERN_COLOR_BAR_FADE,
+	OV2685_TEST_PATTERN_BW_SQUARE,
+	OV2685_TEST_PATTERN_COLOR_SQUARE,
+};
+
+static const struct ov2685_mode supported_modes[] = {
+	{
+		.width = 1600,
+		.height = 1200,
+		.exp_def = 0x04ee,
+		.hts_def = 0x06a4,
+		.vts_def = 0x050e,
+		.reg_list = ov2685_1600x1200_regs,
+	},
+};
+
+/* Write registers up to 4 at a time */
+static int ov2685_write_reg(struct i2c_client *client, u16 reg,
+			    unsigned int len, u32 val)
+{
+	int buf_i;
+	int val_i;
+	u8 buf[6];
+	u8 *val_p;
+	__be32 val_be;
+
+	if (len > 4)
+		return -EINVAL;
+
+	buf[0] = reg >> 8;
+	buf[1] = reg & 0xff;
+
+	val_be = cpu_to_be32(val);
+	val_p = (u8 *)&val_be;
+	buf_i = 2;
+	val_i = 4 - len;
+
+	while (val_i < 4)
+		buf[buf_i++] = val_p[val_i++];
+
+	if (i2c_master_send(client, buf, len + 2) != len + 2)
+		return -EIO;
+
+	return 0;
+}
+
+static int ov2685_write_array(struct i2c_client *client,
+			      const struct regval *regs)
+{
+	int i, ret = 0;
+
+	for (i = 0; ret == 0 && regs[i].addr != REG_NULL; i++)
+		ret = ov2685_write_reg(client, regs[i].addr,
+				       OV2685_REG_VALUE_08BIT, regs[i].val);
+
+	return ret;
+}
+
+/* Read registers up to 4 at a time */
+static int ov2685_read_reg(struct i2c_client *client, u16 reg,
+			   unsigned int len, u32 *val)
+{
+	struct i2c_msg msgs[2];
+	u8 *data_be_p;
+	__be32 data_be = 0;
+	__be16 reg_addr_be = cpu_to_be16(reg);
+	int ret;
+
+	if (len > 4)
+		return -EINVAL;
+
+	data_be_p = (u8 *)&data_be;
+	/* Write register address */
+	msgs[0].addr = client->addr;
+	msgs[0].flags = 0;
+	msgs[0].len = 2;
+	msgs[0].buf = (u8 *)&reg_addr_be;
+
+	/* Read data from register */
+	msgs[1].addr = client->addr;
+	msgs[1].flags = I2C_M_RD;
+	msgs[1].len = len;
+	msgs[1].buf = &data_be_p[4 - len];
+
+	ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
+	if (ret != ARRAY_SIZE(msgs))
+		return -EIO;
+
+	*val = be32_to_cpu(data_be);
+
+	return 0;
+}
+
+static void ov2685_fill_fmt(struct ov2685 *ov2685,
+			    struct v4l2_mbus_framefmt *fmt)
+{
+	fmt->code = MEDIA_BUS_FMT_SBGGR10_1X10;
+	fmt->width = ov2685->cur_mode->width;
+	fmt->height = ov2685->cur_mode->height;
+	fmt->field = V4L2_FIELD_NONE;
+}
+
+static int ov2685_set_fmt(struct v4l2_subdev *sd,
+			  struct v4l2_subdev_pad_config *cfg,
+			  struct v4l2_subdev_format *fmt)
+{
+	struct ov2685 *ov2685 = to_ov2685(sd);
+	struct v4l2_mbus_framefmt *mbus_fmt = &fmt->format;
+
+	ov2685_fill_fmt(ov2685, mbus_fmt);
+
+	return 0;
+}
+
+static int ov2685_get_fmt(struct v4l2_subdev *sd,
+			  struct v4l2_subdev_pad_config *cfg,
+			  struct v4l2_subdev_format *fmt)
+{
+	struct ov2685 *ov2685 = to_ov2685(sd);
+	struct v4l2_mbus_framefmt *mbus_fmt = &fmt->format;
+
+	ov2685_fill_fmt(ov2685, mbus_fmt);
+
+	return 0;
+}
+
+static int ov2685_enum_mbus_code(struct v4l2_subdev *sd,
+				 struct v4l2_subdev_pad_config *cfg,
+				 struct v4l2_subdev_mbus_code_enum *code)
+{
+	if (code->index >= ARRAY_SIZE(supported_modes))
+		return -EINVAL;
+
+	code->code = MEDIA_BUS_FMT_SBGGR10_1X10;
+	return 0;
+}
+
+static int ov2685_enum_frame_sizes(struct v4l2_subdev *sd,
+				   struct v4l2_subdev_pad_config *cfg,
+				   struct v4l2_subdev_frame_size_enum *fse)
+{
+	int index = fse->index;
+
+	if (index >= ARRAY_SIZE(supported_modes))
+		return -EINVAL;
+
+	fse->code = MEDIA_BUS_FMT_SBGGR10_1X10;
+
+	fse->min_width  = supported_modes[index].width;
+	fse->max_width  = supported_modes[index].width;
+	fse->max_height = supported_modes[index].height;
+	fse->min_height = supported_modes[index].height;
+
+	return 0;
+}
+
+static inline void ov2685_set_exposure(struct ov2685 *ov2685, s32 val)
+{
+	ov2685_write_reg(ov2685->client, OV2685_REG_EXPOSURE,
+			 OV2685_REG_VALUE_24BIT, val << 4);
+}
+
+static inline void ov2685_set_gain(struct ov2685 *ov2685, s32 val)
+{
+	ov2685_write_reg(ov2685->client, OV2685_REG_GAIN,
+			 OV2685_REG_VALUE_16BIT, val & OV2685_GAIN_MAX);
+}
+
+static inline void ov2685_set_vts(struct ov2685 *ov2685, s32 val)
+{
+	val += ov2685->cur_mode->height;
+	ov2685_write_reg(ov2685->client, OV2685_REG_VTS,
+			 OV2685_REG_VALUE_16BIT, val);
+}
+
+static inline void ov2685_enable_test_pattern(struct ov2685 *ov2685, u32 pat)
+{
+	ov2685_write_reg(ov2685->client, OV2685_REG_TEST_PATTERN,
+			 OV2685_REG_VALUE_08BIT, ov2685_test_pattern_val[pat]);
+}
+
+static int __ov2685_power_on(struct ov2685 *ov2685)
+{
+	int ret;
+	struct device *dev = &ov2685->client->dev;
+
+	ret = clk_prepare_enable(ov2685->xvclk);
+	if (ret < 0) {
+		dev_err(dev, "Failed to enable xvclk\n");
+		return ret;
+	}
+	clk_set_rate(ov2685->xvclk, 24000000);
+
+	gpiod_set_value_cansleep(ov2685->reset_gpio, 1);
+	/* AVDD and DOVDD may rise in any order */
+	ret = regulator_enable(ov2685->avdd_regulator);
+	if (ret < 0) {
+		dev_err(dev, "Failed to enable AVDD regulator\n");
+		goto disable_xvclk;
+	}
+	ret = regulator_enable(ov2685->dovdd_regulator);
+	if (ret < 0) {
+		dev_err(dev, "Failed to enable DOVDD regulator\n");
+		goto disable_avdd;
+	}
+	/* The minimum delay between AVDD and reset rising can be 0 */
+	gpiod_set_value_cansleep(ov2685->reset_gpio, 0);
+	/* 8192 xvclk cycles prior to the first SCCB transaction.
+	 * NOTE: An additional 1ms must be added to wait for
+	 *       SCCB to become stable when using internal DVDD.
+	 */
+	usleep_range(1350, 1500);
+
+	/* HACK: ov2685 would output messy data after reset(R0103),
+	 * writing register before .s_stream() as a workaround
+	 */
+	ret = ov2685_write_array(ov2685->client, ov2685->cur_mode->reg_list);
+
+	return ret;
+disable_avdd:
+	regulator_disable(ov2685->avdd_regulator);
+disable_xvclk:
+	clk_disable_unprepare(ov2685->xvclk);
+
+	return ret;
+}
+
+static void __ov2685_power_off(struct ov2685 *ov2685)
+{
+	/* 512 xvclk cycles after the last SCCB transaction or MIPI frame end */
+	usleep_range(30, 50);
+	clk_disable_unprepare(ov2685->xvclk);
+	gpiod_set_value_cansleep(ov2685->reset_gpio, 1);
+	regulator_disable(ov2685->dovdd_regulator);
+	regulator_disable(ov2685->avdd_regulator);
+}
+
+static int ov2685_s_power(struct v4l2_subdev *sd, int on)
+{
+	struct ov2685 *ov2685 = to_ov2685(sd);
+	int ret = 0;
+
+	mutex_lock(&ov2685->mutex);
+
+	if (on)
+		ret = pm_runtime_get_sync(&ov2685->client->dev);
+	else
+		ret = pm_runtime_put(&ov2685->client->dev);
+
+	mutex_unlock(&ov2685->mutex);
+
+	return ret;
+}
+
+static int ov2685_s_stream(struct v4l2_subdev *sd, int on)
+{
+	struct ov2685 *ov2685 = to_ov2685(sd);
+	struct i2c_client *client = ov2685->client;
+	int ret = 0;
+
+	mutex_lock(&ov2685->mutex);
+
+	on = !!on;
+	if (on == ov2685->streaming)
+		goto unlock_and_return;
+
+	if (on) {
+		/* In case these controls are set before streaming */
+		ov2685_set_exposure(ov2685, ov2685->exposure->val);
+		ov2685_set_gain(ov2685, ov2685->anal_gain->val);
+		ov2685_set_vts(ov2685, ov2685->vblank->val);
+		ov2685_enable_test_pattern(ov2685, ov2685->test_pattern->val);
+
+		ret = ov2685_write_reg(client, REG_SC_CTRL_MODE,
+				OV2685_REG_VALUE_08BIT, SC_CTRL_MODE_STREAMING);
+		if (ret)
+			goto unlock_and_return;
+	} else {
+		ret = ov2685_write_reg(client, REG_SC_CTRL_MODE,
+				OV2685_REG_VALUE_08BIT, SC_CTRL_MODE_STANDBY);
+		if (ret)
+			goto unlock_and_return;
+	}
+
+	ov2685->streaming = on;
+
+unlock_and_return:
+	mutex_unlock(&ov2685->mutex);
+	return ret;
+}
+
+#ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
+static int ov2685_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
+{
+	struct ov2685 *ov2685 = to_ov2685(sd);
+	struct v4l2_mbus_framefmt *try_fmt;
+
+	mutex_lock(&ov2685->mutex);
+
+	try_fmt = v4l2_subdev_get_try_format(sd, fh->pad, 0);
+	/* Initialize try_fmt */
+	ov2685_fill_fmt(ov2685, try_fmt);
+
+	mutex_unlock(&ov2685->mutex);
+
+	return 0;
+}
+#endif
+
+static int ov2685_runtime_resume(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct v4l2_subdev *sd = i2c_get_clientdata(client);
+	struct ov2685 *ov2685 = to_ov2685(sd);
+	int ret;
+
+	ret = __ov2685_power_on(ov2685);
+	if (ret)
+		return ret;
+
+	if (ov2685->streaming) {
+		ret = ov2685_s_stream(sd, 1);
+		if (ret)
+			__ov2685_power_off(ov2685);
+	}
+
+	return ret;
+}
+
+static int ov2685_runtime_suspend(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct v4l2_subdev *sd = i2c_get_clientdata(client);
+	struct ov2685 *ov2685 = to_ov2685(sd);
+
+	__ov2685_power_off(ov2685);
+
+	return 0;
+}
+
+static const struct dev_pm_ops ov2685_pm_ops = {
+	SET_RUNTIME_PM_OPS(ov2685_runtime_suspend,
+			   ov2685_runtime_resume, NULL)
+};
+
+static int ov2685_set_ctrl(struct v4l2_ctrl *ctrl)
+{
+	struct ov2685 *ov2685 = container_of(ctrl->handler,
+					     struct ov2685, ctrl_handler);
+	struct i2c_client *client = ov2685->client;
+	s64 max;
+	int ret = 0;
+
+	/* Propagate change of current control to all related controls */
+	switch (ctrl->id) {
+	case V4L2_CID_VBLANK:
+		/* Update max exposure while meeting expected vblanking */
+		max = ov2685->cur_mode->height + ctrl->val - 4;
+		__v4l2_ctrl_modify_range(ov2685->exposure,
+					 ov2685->exposure->minimum, max,
+					 ov2685->exposure->step,
+					 ov2685->exposure->default_value);
+		break;
+	}
+
+	pm_runtime_get_sync(&client->dev);
+	switch (ctrl->id) {
+	case V4L2_CID_EXPOSURE:
+		ov2685_set_exposure(ov2685, ctrl->val);
+		break;
+	case V4L2_CID_ANALOGUE_GAIN:
+		ov2685_set_gain(ov2685, ctrl->val);
+		break;
+	case V4L2_CID_VBLANK:
+		ov2685_set_vts(ov2685, ctrl->val);
+		break;
+	case V4L2_CID_TEST_PATTERN:
+		ov2685_enable_test_pattern(ov2685, ctrl->val);
+		break;
+	default:
+		dev_warn(&client->dev, "%s Unhandled id:0x%x, val:0x%x\n",
+			 __func__, ctrl->id, ctrl->val);
+		break;
+	};
+	pm_runtime_put(&client->dev);
+
+	return ret;
+}
+
+static struct v4l2_subdev_core_ops ov2685_core_ops = {
+	.s_power = ov2685_s_power,
+};
+
+static struct v4l2_subdev_video_ops ov2685_video_ops = {
+	.s_stream = ov2685_s_stream,
+};
+
+static struct v4l2_subdev_pad_ops ov2685_pad_ops = {
+	.enum_mbus_code = ov2685_enum_mbus_code,
+	.enum_frame_size = ov2685_enum_frame_sizes,
+	.get_fmt = ov2685_get_fmt,
+	.set_fmt = ov2685_set_fmt,
+};
+
+static struct v4l2_subdev_ops ov2685_subdev_ops = {
+	.core	= &ov2685_core_ops,
+	.video	= &ov2685_video_ops,
+	.pad	= &ov2685_pad_ops,
+};
+
+#ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
+static const struct v4l2_subdev_internal_ops ov2685_internal_ops = {
+	.open = ov2685_open,
+};
+#endif
+
+static const struct v4l2_ctrl_ops ov2685_ctrl_ops = {
+	.s_ctrl = ov2685_set_ctrl,
+};
+
+static int ov2685_initialize_controls(struct ov2685 *ov2685)
+{
+	const struct ov2685_mode *mode;
+	struct v4l2_ctrl_handler *handler;
+	struct v4l2_ctrl *ctrl;
+	u64 exposure_max;
+	u32 pixel_rate, h_blank;
+	int ret;
+
+	handler = &ov2685->ctrl_handler;
+	mode = ov2685->cur_mode;
+	ret = v4l2_ctrl_handler_init(handler, 1);
+	if (ret)
+		return ret;
+	handler->lock = &ov2685->mutex;
+
+	ctrl = v4l2_ctrl_new_int_menu(handler, NULL, V4L2_CID_LINK_FREQ,
+				      0, 0, link_freq_menu_items);
+	if (ctrl)
+		ctrl->flags |= V4L2_CTRL_FLAG_READ_ONLY;
+
+	pixel_rate = (link_freq_menu_items[0] * 2 * OV2685_LANES) /
+		     OV2685_BITS_PER_SAMPLE;
+	v4l2_ctrl_new_std(handler, NULL, V4L2_CID_PIXEL_RATE,
+			  0, pixel_rate, 1, pixel_rate);
+
+	h_blank = mode->hts_def - mode->width;
+	ov2685->hblank = v4l2_ctrl_new_std(handler, NULL, V4L2_CID_HBLANK,
+				h_blank, h_blank, 1, h_blank);
+	if (ov2685->hblank)
+		ov2685->hblank->flags |= V4L2_CTRL_FLAG_READ_ONLY;
+
+	ov2685->vblank = v4l2_ctrl_new_std(handler, &ov2685_ctrl_ops,
+				V4L2_CID_VBLANK, mode->vts_def - mode->height,
+				OV2685_VTS_MAX - mode->height, 1,
+				mode->vts_def - mode->height);
+
+	exposure_max = mode->vts_def - 4;
+	ov2685->exposure = v4l2_ctrl_new_std(handler, &ov2685_ctrl_ops,
+				V4L2_CID_EXPOSURE, OV2685_EXPOSURE_MIN,
+				exposure_max, OV2685_EXPOSURE_STEP,
+				mode->exp_def);
+
+	ov2685->anal_gain = v4l2_ctrl_new_std(handler, &ov2685_ctrl_ops,
+				V4L2_CID_ANALOGUE_GAIN, OV2685_GAIN_MIN,
+				OV2685_GAIN_MAX, OV2685_GAIN_STEP,
+				OV2685_GAIN_DEFAULT);
+
+	ov2685->test_pattern = v4l2_ctrl_new_std_menu_items(handler,
+				&ov2685_ctrl_ops, V4L2_CID_TEST_PATTERN,
+				ARRAY_SIZE(ov2685_test_pattern_menu) - 1,
+				0, 0, ov2685_test_pattern_menu);
+
+	if (handler->error) {
+		v4l2_ctrl_handler_free(handler);
+		return handler->error;
+	}
+
+	ov2685->subdev.ctrl_handler = handler;
+
+	return 0;
+}
+
+static int ov2685_check_sensor_id(struct ov2685 *ov2685,
+				  struct i2c_client *client)
+{
+	struct device *dev = &ov2685->client->dev;
+	int id, ret;
+
+	ret = __ov2685_power_on(ov2685);
+	if (ret)
+		return ret;
+	ov2685_read_reg(client, OV2685_REG_CHIP_ID,
+			OV2685_REG_VALUE_16BIT, &id);
+	__ov2685_power_off(ov2685);
+
+	if (id != CHIP_ID) {
+		dev_err(dev, "Wrong camera sensor id(%04x)\n", id);
+		return -EINVAL;
+	}
+
+	dev_info(dev, "Detected OV%04x sensor\n", CHIP_ID);
+
+	return 0;
+}
+
+static int ov2685_probe(struct i2c_client *client,
+			const struct i2c_device_id *id)
+{
+	struct device *dev = &client->dev;
+	struct ov2685 *ov2685;
+	int ret;
+
+	ov2685 = devm_kzalloc(dev, sizeof(*ov2685), GFP_KERNEL);
+	if (!ov2685)
+		return -ENOMEM;
+
+	ov2685->client = client;
+	ov2685->cur_mode = &supported_modes[0];
+
+	ov2685->xvclk = devm_clk_get(dev, "xvclk");
+	if (IS_ERR(ov2685->xvclk)) {
+		dev_err(dev, "Failed to get xvclk\n");
+		return -EINVAL;
+	}
+
+	ov2685->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
+	if (IS_ERR(ov2685->reset_gpio)) {
+		dev_err(dev, "Failed to get reset-gpios\n");
+		return -EINVAL;
+	}
+
+	ov2685->avdd_regulator = devm_regulator_get(dev, "avdd");
+	if (IS_ERR(ov2685->avdd_regulator)) {
+		dev_err(dev, "Failed to get avdd-supply\n");
+		return -EINVAL;
+	}
+	ov2685->dovdd_regulator = devm_regulator_get(dev, "dovdd");
+	if (IS_ERR(ov2685->dovdd_regulator)) {
+		dev_err(dev, "Failed to get dovdd-supply\n");
+		return -EINVAL;
+	}
+
+	mutex_init(&ov2685->mutex);
+	v4l2_i2c_subdev_init(&ov2685->subdev, client, &ov2685_subdev_ops);
+	ret = ov2685_initialize_controls(ov2685);
+	if (ret)
+		goto destroy_mutex;
+
+	ret = ov2685_check_sensor_id(ov2685, client);
+	if (ret)
+		return ret;
+
+#ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
+	ov2685->subdev.internal_ops = &ov2685_internal_ops;
+#endif
+#if defined(CONFIG_MEDIA_CONTROLLER)
+	ov2685->pad.flags = MEDIA_PAD_FL_SOURCE;
+	ov2685->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
+	ov2685->subdev.entity.function = MEDIA_ENT_F_CAM_SENSOR;
+	ret = media_entity_pads_init(&ov2685->subdev.entity, 1, &ov2685->pad);
+	if (ret < 0)
+		goto free_ctrl_handler;
+#endif
+
+	ret = v4l2_async_register_subdev(&ov2685->subdev);
+	if (ret) {
+		dev_err(dev, "v4l2 async register subdev failed\n");
+		goto clean_entity;
+	}
+
+	pm_runtime_enable(dev);
+	return 0;
+
+clean_entity:
+#if defined(CONFIG_MEDIA_CONTROLLER)
+	media_entity_cleanup(&ov2685->subdev.entity);
+#endif
+free_ctrl_handler:
+	v4l2_ctrl_handler_free(&ov2685->ctrl_handler);
+destroy_mutex:
+	mutex_destroy(&ov2685->mutex);
+
+	return ret;
+}
+
+static int ov2685_remove(struct i2c_client *client)
+{
+	struct ov2685 *ov2685 = i2c_get_clientdata(client);
+
+	__ov2685_power_off(ov2685);
+	v4l2_async_unregister_subdev(&ov2685->subdev);
+	media_entity_cleanup(&ov2685->subdev.entity);
+	v4l2_ctrl_handler_free(&ov2685->ctrl_handler);
+	mutex_destroy(&ov2685->mutex);
+
+	return 0;
+}
+
+static const struct of_device_id ov2685_of_match[] = {
+	{ .compatible = "ovti,ov2685" },
+	{},
+};
+
+static struct i2c_driver ov2685_i2c_driver = {
+	.driver = {
+		.name = "ov2685",
+		.owner = THIS_MODULE,
+		.pm = &ov2685_pm_ops,
+		.of_match_table = ov2685_of_match
+	},
+	.probe		= &ov2685_probe,
+	.remove		= &ov2685_remove,
+};
+
+module_i2c_driver(ov2685_i2c_driver);
+
+MODULE_DESCRIPTION("OmniVision ov2685 sensor driver");
+MODULE_LICENSE("GPL v2");
-- 
1.9.1

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