Message-Id: <17092ffede9eb8aff0d6a7f54ca771e81712b18e.1476286687.git.roliveir@synopsys.com>
Date:   Wed, 12 Oct 2016 17:02:22 +0100
From:   Ramiro Oliveira <Ramiro.Oliveira@...opsys.com>
To:     linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
        devicetree@...r.kernel.org
Cc:     robh+dt@...nel.org, mark.rutland@....com, mchehab@...nel.org,
        davem@...emloft.net, geert@...ux-m68k.org,
        akpm@...ux-foundation.org, kvalo@...eaurora.org,
        linux@...ck-us.net, hverkuil@...all.nl, lars@...afoo.de,
        pavel@....cz, robert.jarzmik@...e.fr, slongerbeam@...il.com,
        dheitmueller@...nellabs.com, pali.rohar@...il.com,
        CARLOS.PALMINHA@...opsys.com,
        Ramiro Oliveira <Ramiro.Oliveira@...opsys.com>
Subject: [PATCH v3 2/2] Add support for Omnivision OV5647

Signed-off-by: Ramiro Oliveira <roliveir@...opsys.com>
---
 MAINTAINERS                |   7 +
 drivers/media/i2c/Kconfig  |  12 +
 drivers/media/i2c/Makefile |   1 +
 drivers/media/i2c/ov5647.c | 891 +++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 911 insertions(+)
 create mode 100644 drivers/media/i2c/ov5647.c

diff --git a/MAINTAINERS b/MAINTAINERS
index 0560911..11c414b 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -8661,6 +8661,13 @@ M:	Harald Welte <laforge@...monks.org>
 S:	Maintained
 F:	drivers/char/pcmcia/cm4040_cs.*
 
+OMNIVISION OV5647 SENSOR DRIVER
+M:	Ramiro Oliveira <roliveir@...opsys.com>
+L:	linux-media@...r.kernel.org
+T:	git git://linuxtv.org/media_tree.git
+S:	Maintained
+F:	drivers/media/i2c/ov5647.c
+
 OMNIVISION OV7670 SENSOR DRIVER
 M:	Jonathan Corbet <corbet@....net>
 L:	linux-media@...r.kernel.org
diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
index 2669b4b..4237165 100644
--- a/drivers/media/i2c/Kconfig
+++ b/drivers/media/i2c/Kconfig
@@ -531,6 +531,18 @@ config VIDEO_OV2659
 	  To compile this driver as a module, choose M here: the
 	  module will be called ov2659.
 
+config VIDEO_OV5647
+	tristate "OmniVision OV5647 sensor support"
+	depends on OF
+	depends on I2C && VIDEO_V4L2 && VIDEO_V4L2_SUBDEV_API
+	depends on MEDIA_CAMERA_SUPPORT
+	---help---
+	  This is a Video4Linux2 sensor-level driver for the OmniVision
+	  OV5647 camera.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called ov5647.
+
 config VIDEO_OV7640
 	tristate "OmniVision OV7640 sensor support"
 	depends on I2C && VIDEO_V4L2
diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile
index 92773b2..0d9014c 100644
--- a/drivers/media/i2c/Makefile
+++ b/drivers/media/i2c/Makefile
@@ -82,3 +82,4 @@ obj-$(CONFIG_VIDEO_IR_I2C)  += ir-kbd-i2c.o
 obj-$(CONFIG_VIDEO_ML86V7667)	+= ml86v7667.o
 obj-$(CONFIG_VIDEO_OV2659)	+= ov2659.o
 obj-$(CONFIG_VIDEO_TC358743)	+= tc358743.o
+obj-$(CONFIG_VIDEO_OV5647)	+= ov5647.o
diff --git a/drivers/media/i2c/ov5647.c b/drivers/media/i2c/ov5647.c
new file mode 100644
index 0000000..ba9a874
--- /dev/null
+++ b/drivers/media/i2c/ov5647.c
@@ -0,0 +1,891 @@
+/*
+ * A V4L2 driver for OmniVision OV5647 cameras.
+ *
+ * Based on Samsung S5K6AAFX SXGA 1/6" 1.3M CMOS Image Sensor driver
+ * Copyright (C) 2011 Sylwester Nawrocki <s.nawrocki@...sung.com>
+ *
+ * Based on Omnivision OV7670 Camera Driver
+ * Copyright (C) 2006-7 Jonathan Corbet <corbet@....net>
+ *
+ * Copyright (C) 2016, Synopsys, Inc.
+ *
+ */
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/delay.h>
+#include <linux/videodev2.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-ctrls.h>
+#include <media/v4l2-mediabus.h>
+#include <media/v4l2-image-sizes.h>
+#include <media/v4l2-of.h>
+#include <linux/io.h>
+
+static bool debug;
+module_param(debug, bool, 0644);
+MODULE_PARM_DESC(debug, "Debug level (0-1)");
+
+/*
+ * The ov5647 sits on i2c with ID 0x6c
+ */
+#define OV5647_I2C_ADDR 0x6c
+#define SENSOR_NAME "ov5647"
+
+#define OV5647_REG_CHIPID_H	0x300A
+#define OV5647_REG_CHIPID_L	0x300B
+
+#define REG_TERM 0xfffe
+#define VAL_TERM 0xfe
+#define REG_DLY  0xffff
+
+/*define the voltage level of control signal*/
+#define CSI_STBY_ON		1
+#define CSI_STBY_OFF		0
+#define CSI_RST_ON		0
+#define CSI_RST_OFF		1
+#define CSI_PWR_ON		1
+#define CSI_PWR_OFF		0
+#define CSI_AF_PWR_ON		1
+#define CSI_AF_PWR_OFF		0
+
+
+#define OV5647_ROW_START		0x01
+#define OV5647_ROW_START_MIN		0
+#define OV5647_ROW_START_MAX		2004
+#define OV5647_ROW_START_DEF		54
+
+#define OV5647_COLUMN_START		0x02
+#define OV5647_COLUMN_START_MIN		0
+#define OV5647_COLUMN_START_MAX		2750
+#define OV5647_COLUMN_START_DEF		16
+
+#define OV5647_WINDOW_HEIGHT		0x03
+#define OV5647_WINDOW_HEIGHT_MIN	2
+#define OV5647_WINDOW_HEIGHT_MAX	2006
+#define OV5647_WINDOW_HEIGHT_DEF	1944
+
+#define OV5647_WINDOW_WIDTH		0x04
+#define OV5647_WINDOW_WIDTH_MIN		2
+#define OV5647_WINDOW_WIDTH_MAX		2752
+#define OV5647_WINDOW_WIDTH_DEF		2592
+
+enum power_seq_cmd {
+	CSI_SUBDEV_PWR_OFF = 0x00,
+	CSI_SUBDEV_PWR_ON = 0x01,
+};
+
+struct regval_list {
+	uint16_t addr;
+	uint8_t data;
+};
+
+struct cfg_array {
+	struct regval_list *regs;
+	int size;
+};
+
+struct sensor_win_size {
+	int width;
+	int height;
+	unsigned int hoffset;
+	unsigned int voffset;
+	unsigned int hts;
+	unsigned int vts;
+	unsigned int pclk;
+	unsigned int mipi_bps;
+	unsigned int fps_fixed;
+	unsigned int bin_factor;
+	unsigned int intg_min;
+	unsigned int intg_max;
+	void *regs;
+	int regs_size;
+	int (*set_size)(struct v4l2_subdev *subdev);
+};
+
+
+struct ov5647 {
+	struct device			*dev;
+	struct v4l2_subdev		subdev;
+	struct media_pad		pad;
+	struct mutex			lock;
+	struct v4l2_mbus_framefmt	format;
+	struct sensor_format_struct	*fmt;
+	unsigned int			width;
+	unsigned int			height;
+	unsigned int			capture_mode;
+	int				hue;
+	struct v4l2_fract		tpf;
+	struct sensor_win_size		*current_wins;
+};
+
+static inline struct ov5647 *to_state(struct v4l2_subdev *subdev)
+{
+	return container_of(subdev, struct ov5647, subdev);
+}
+
+static struct regval_list sensor_oe_disable_regs[] = {
+	{0x3000, 0x00},
+	{0x3001, 0x00},
+	{0x3002, 0x00},
+};
+
+static struct regval_list sensor_oe_enable_regs[] = {
+	{0x3000, 0x0f},
+	{0x3001, 0xff},
+	{0x3002, 0xe4},
+};
+
+static struct regval_list ov5647_640x480[] = {
+	{0x0100, 0x00},
+	{0x0103, 0x01},
+	{0x3034, 0x08},
+	{0x3035, 0x21},
+	{0x3036, 0x46},
+	{0x303c, 0x11},
+	{0x3106, 0xf5},
+	{0x3821, 0x07},
+	{0x3820, 0x41},
+	{0x3827, 0xec},
+	{0x370c, 0x0f},
+	{0x3612, 0x59},
+	{0x3618, 0x00},
+	{0x5000, 0x06},
+	{0x5001, 0x01},
+	{0x5002, 0x41},
+	{0x5003, 0x08},
+	{0x5a00, 0x08},
+	{0x3000, 0x00},
+	{0x3001, 0x00},
+	{0x3002, 0x00},
+	{0x3016, 0x08},
+	{0x3017, 0xe0},
+	{0x3018, 0x44},
+	{0x301c, 0xf8},
+	{0x301d, 0xf0},
+	{0x3a18, 0x00},
+	{0x3a19, 0xf8},
+	{0x3c01, 0x80},
+	{0x3b07, 0x0c},
+	{0x380c, 0x07},
+	{0x380d, 0x68},
+	{0x380e, 0x03},
+	{0x380f, 0xd8},
+	{0x3814, 0x31},
+	{0x3815, 0x31},
+	{0x3708, 0x64},
+	{0x3709, 0x52},
+	{0x3808, 0x02},
+	{0x3809, 0x80},
+	{0x380a, 0x01},
+	{0x380b, 0xE0},
+	{0x3801, 0x00},
+	{0x3802, 0x00},
+	{0x3803, 0x00},
+	{0x3804, 0x0a},
+	{0x3805, 0x3f},
+	{0x3806, 0x07},
+	{0x3807, 0xa1},
+	{0x3811, 0x08},
+	{0x3813, 0x02},
+	{0x3630, 0x2e},
+	{0x3632, 0xe2},
+	{0x3633, 0x23},
+	{0x3634, 0x44},
+	{0x3636, 0x06},
+	{0x3620, 0x64},
+	{0x3621, 0xe0},
+	{0x3600, 0x37},
+	{0x3704, 0xa0},
+	{0x3703, 0x5a},
+	{0x3715, 0x78},
+	{0x3717, 0x01},
+	{0x3731, 0x02},
+	{0x370b, 0x60},
+	{0x3705, 0x1a},
+	{0x3f05, 0x02},
+	{0x3f06, 0x10},
+	{0x3f01, 0x0a},
+	{0x3a08, 0x01},
+	{0x3a09, 0x27},
+	{0x3a0a, 0x00},
+	{0x3a0b, 0xf6},
+	{0x3a0d, 0x04},
+	{0x3a0e, 0x03},
+	{0x3a0f, 0x58},
+	{0x3a10, 0x50},
+	{0x3a1b, 0x58},
+	{0x3a1e, 0x50},
+	{0x3a11, 0x60},
+	{0x3a1f, 0x28},
+	{0x4001, 0x02},
+	{0x4004, 0x02},
+	{0x4000, 0x09},
+	{0x4837, 0x24},
+	{0x4050, 0x6e},
+	{0x4051, 0x8f},
+	{0x0100, 0x01},
+};
+
+struct sensor_format_struct;
+
+/**
+* @short I2C Write operation
+* @param[in] i2c_client I2C client
+* @param[in] reg register address
+* @param[in] val value to write
+* @return Error code
+*/
+static int ov5647_write(struct v4l2_subdev *sd, uint16_t reg, uint8_t val)
+{
+	int ret;
+	unsigned char data[3] = { reg >> 8, reg & 0xff, val};
+	struct i2c_client *client = v4l2_get_subdevdata(sd);
+
+	ret = i2c_master_send(client, data, 3);
+	if (ret < 3) {
+		v4l2_dbg(1, debug, sd, "%s: i2c write error, reg: %x\n",
+				__func__, reg);
+		return ret < 0 ? ret : -EIO;
+	}
+	return 0;
+}
+
+/**
+* @short I2C Read operation
+* @param[in] i2c_client I2C client
+* @param[in] reg register address
+* @param[out] val value read
+* @return Error code
+*/
+static int ov5647_read(struct v4l2_subdev *sd, uint16_t reg, uint8_t *val)
+{
+	int ret;
+	unsigned char data_w[2] = { reg >> 8, reg & 0xff };
+	struct i2c_client *client = v4l2_get_subdevdata(sd);
+
+
+	ret = i2c_master_send(client, data_w, 2);
+
+	if (ret < 2) {
+		v4l2_dbg(1, debug, sd, "%s: i2c read error, reg: %x\n",
+			__func__, reg);
+		return ret < 0 ? ret : -EIO;
+	}
+
+
+	ret = i2c_master_recv(client, val, 1);
+
+	if (ret < 1) {
+		v4l2_dbg(1, debug, sd, "%s: i2c read error, reg: %x\n",
+				__func__, reg);
+		return ret < 0 ? ret : -EIO;
+	}
+	return 0;
+}
+
+static int ov5647_write_array(struct v4l2_subdev *subdev,
+				struct regval_list *regs, int array_size)
+{
+	int i = 0;
+	int ret = 0;
+
+	if (!regs)
+		return -EINVAL;
+
+	while (i < array_size) {
+		if (regs->addr == REG_DLY)
+			mdelay(regs->data);
+		else
+			ret = ov5647_write(subdev, regs->addr, regs->data);
+
+		if (ret == -EIO)
+			return ret;
+
+		i++;
+		regs++;
+	}
+	return 0;
+}
+
+static void ov5647_set_virtual_channel(struct v4l2_subdev *subdev, int channel)
+{
+	u8 channel_id;
+
+	ov5647_read(subdev, 0x4814, &channel_id);
+	channel_id &= ~(3 << 6);
+	ov5647_write(subdev, 0x4814, channel_id | (channel << 6));
+}
+
+/**
+* @short Stream ON
+* @param[in] subdev v4l2 subdev
+* @return Error code
+*/
+void ov5647_stream_on(struct v4l2_subdev *subdev)
+{
+	ov5647_write(subdev, 0x4202, 0x00);
+	v4l2_dbg(1, debug, subdev, "Stream on");
+	ov5647_write(subdev, 0x300D, 0x00);
+
+}
+
+/**
+* @short Stream OFF
+* @param[in] subdev v4l2 subdev
+* @return Error code
+*/
+void ov5647_stream_off(struct v4l2_subdev *subdev)
+{
+	ov5647_write(subdev, 0x4202, 0x0f);
+	v4l2_dbg(1, debug, subdev, "Stream off");
+	ov5647_write(subdev, 0x300D, 0x01);
+}
+
+/****************************************************************************/
+
+/**
+ * @short Set SW standby
+ * @param[in] subdev v4l2 subdev
+ * @param[in] on_off standby on or off
+ * @return Error code
+ */
+static int sensor_s_sw_stby(struct v4l2_subdev *subdev, int on_off)
+{
+	int ret;
+	unsigned char rdval;
+
+	ret = ov5647_read(subdev, 0x0100, &rdval);
+	if (ret != 0)
+		return ret;
+
+	if (on_off == CSI_STBY_ON)
+		ret = ov5647_write(subdev, 0x0100, rdval&0xfe);
+
+	else
+		ret = ov5647_write(subdev, 0x0100, rdval|0x01);
+
+	return ret;
+}
+
+/**
+ * @short Store information about the video data format.
+ */
+static struct sensor_format_struct {
+	__u8 *desc;
+	u32 mbus_code;
+	struct regval_list *regs;
+	int regs_size;
+	int bpp;
+} sensor_formats[] = {
+	{
+		.desc		= "Raw RGB Bayer",
+		.mbus_code	= MEDIA_BUS_FMT_SBGGR8_1X8,
+		.regs		= ov5647_640x480,
+		.regs_size	= ARRAY_SIZE(ov5647_640x480),
+		.bpp		= 1
+	},
+};
+#define N_FMTS ARRAY_SIZE(sensor_formats)
+
+/* ----------------------------------------------------------------------- */
+
+/**
+* @short Initialize sensor
+* @param[in] subdev v4l2 subdev
+* @param[in] val not used
+* @return Error code
+*/
+static int __sensor_init(struct v4l2_subdev *subdev)
+{
+	int ret;
+	uint8_t resetval;
+	unsigned char rdval;
+
+	v4l2_dbg(1, debug, subdev, "sensor init\n");
+
+	ret = ov5647_read(subdev, 0x0100, &rdval);
+	if (ret != 0)
+		return ret;
+
+	ov5647_write(subdev, 0x4800, 0x25);
+	ov5647_stream_off(subdev);
+
+	ret = ov5647_write_array(subdev, ov5647_640x480,
+					ARRAY_SIZE(ov5647_640x480));
+	if (ret < 0) {
+		v4l2_err(subdev, "write sensor_default_regs error\n");
+		return ret;
+	}
+
+	ov5647_set_virtual_channel(subdev, 0);
+
+	ov5647_read(subdev, 0x0100, &resetval);
+		if (!resetval&0x01) {
+			v4l2_dbg(1, debug, subdev,
+					"DEVICE WAS IN SOFTWARE STANDBY");
+			ov5647_write(subdev, 0x0100, 0x01);
+		}
+
+	ov5647_write(subdev, 0x4800, 0x04);
+	ov5647_stream_on(subdev);
+
+	return 0;
+}
+
+/**
+* @short Control sensor power state
+* @param[in] subdev v4l2 subdev
+* @param[in] on Sensor power
+* @return Error code
+*/
+static int sensor_power(struct v4l2_subdev *subdev, int on)
+{
+	int ret;
+	struct ov5647 *ov5647 = to_state(subdev);
+
+	ret = 0;
+	mutex_lock(&ov5647->lock);
+
+	switch (on) {
+	case CSI_SUBDEV_PWR_OFF:
+		v4l2_dbg(1, debug, subdev, "CSI SUBDEV PWR OFF!\n");
+
+		v4l2_dbg(1, debug, subdev, "disable oe!\n");
+		ret = ov5647_write_array(subdev, sensor_oe_disable_regs,
+				ARRAY_SIZE(sensor_oe_disable_regs));
+
+		if (ret < 0)
+			v4l2_dbg(1, debug, subdev, "disable oe failed!\n");
+
+		ret = sensor_s_sw_stby(subdev, CSI_STBY_ON);
+
+		if (ret < 0)
+			v4l2_dbg(1, debug, subdev, "soft stby failed!\n");
+
+		break;
+	case CSI_SUBDEV_PWR_ON:
+		v4l2_dbg(1, debug, subdev, "CSI SUBDEV PWR ON!\n");
+
+		ret = ov5647_write_array(subdev, sensor_oe_enable_regs,
+				ARRAY_SIZE(sensor_oe_enable_regs));
+
+		ret = __sensor_init(subdev);
+
+		if (ret < 0) {
+			v4l2_err(subdev,
+				"Camera not available! Check Power!\n");
+			break;
+		}
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	mutex_unlock(&ov5647->lock);
+
+	return 0;
+}
+
+#ifdef CONFIG_VIDEO_ADV_DEBUG
+/**
+* @short Get register value
+* @param[in] subdev v4l2 subdev
+* @param[in] reg register struct
+* @return Error code
+*/
+static int sensor_get_register(struct v4l2_subdev *subdev,
+				struct v4l2_dbg_register *reg)
+{
+	unsigned char val = 0;
+	int ret;
+
+	ret = ov5647_read(subdev, reg->reg & 0xff, &val);
+	reg->val = val;
+	reg->size = 1;
+	return ret;
+}
+
+/**
+* @short Set register value
+* @param[in] subdev v4l2 subdev
+* @param[in] reg register struct
+* @return Error code
+*/
+static int sensor_set_register(struct v4l2_subdev *subdev,
+				const struct v4l2_dbg_register *reg)
+{
+	ov5647_write(subdev, reg->reg & 0xff, reg->val & 0xff);
+	return 0;
+}
+#endif
+
+/* ----------------------------------------------------------------------- */
+
+/**
+ * @short Subdev core operations registration
+ */
+static const struct v4l2_subdev_core_ops sensor_core_ops = {
+	.s_power		= sensor_power,
+#ifdef CONFIG_VIDEO_ADV_DEBUG
+	.g_register		= sensor_get_register,
+	.s_register		= sensor_set_register,
+#endif
+};
+
+/* ----------------------------------------------------------------------- */
+
+
+
+/**
+* @short Enumerate available image formats
+* @param[in] subdev v4l2 subdev
+* @param[in] index index
+* @param[in] code MBUS Pixel code
+* @return Error code
+*/
+static int sensor_enum_fmt(struct v4l2_subdev *sd,
+		struct v4l2_subdev_pad_config *cfg,
+		struct v4l2_subdev_mbus_code_enum *code)
+{
+	if (code->pad || code->index >= N_FMTS)
+		return -EINVAL;
+
+	code->code = sensor_formats[code->index].mbus_code;
+	return 0;
+}
+
+/**
+* @short Try frame format internal function
+* @param[in] subdev v4l2 subdev
+* @param[in] fmt frame format
+* @return Error code
+*/
+static int sensor_try_fmt_internal(struct v4l2_subdev *subdev,
+	struct v4l2_mbus_framefmt *fmt, struct sensor_format_struct **ret_fmt,
+	struct sensor_win_size **ret_wsize)
+{
+	int index;
+
+	for (index = 0; index < N_FMTS; index++)
+		if (sensor_formats[index].mbus_code == fmt->code)
+			break;
+
+	if (index >= N_FMTS)
+		return -EINVAL;
+
+	if (ret_fmt != NULL)
+		*ret_fmt = sensor_formats + index;
+
+	fmt->field = V4L2_FIELD_NONE;
+
+	return 0;
+}
+
+/**
+* @short Set frame format
+* @param[in] subdev v4l2 subdev
+* @param[in] fmt frame format
+* @return Error code
+*/
+static int sensor_s_fmt(struct v4l2_subdev *subdev,
+		struct v4l2_subdev_pad_config *cfg,
+		struct v4l2_subdev_format *fmt)
+{
+	int ret;
+	struct sensor_format_struct *sensor_fmt;
+	struct sensor_win_size *wsize;
+	struct ov5647 *info = to_state(subdev);
+
+	ov5647_write_array(subdev, sensor_oe_disable_regs,
+					ARRAY_SIZE(sensor_oe_disable_regs));
+
+	ret = sensor_try_fmt_internal(subdev, &fmt->format,
+					&sensor_fmt, &wsize);
+	if (ret)
+		return ret;
+
+	ov5647_write_array(subdev, sensor_fmt->regs, sensor_fmt->regs_size);
+
+	ret = 0;
+
+	if (wsize->regs)
+		ov5647_write_array(subdev, wsize->regs, wsize->regs_size);
+
+	if (wsize->set_size)
+		wsize->set_size(subdev);
+
+	info->fmt = sensor_fmt;
+	info->width = wsize->width;
+	info->height = wsize->height;
+
+	ov5647_write_array(subdev, sensor_oe_enable_regs,
+				ARRAY_SIZE(sensor_oe_enable_regs));
+
+	return 0;
+}
+
+/**
+* @short Set stream parameters
+* @param[in] subdev v4l2 subdev
+* @param[in] parms stream parameters
+* @return Error code
+*/
+static int sensor_s_parm(struct v4l2_subdev *subdev,
+				struct v4l2_streamparm *parms)
+{
+	struct v4l2_captureparm *cp = &parms->parm.capture;
+	struct ov5647 *info = to_state(subdev);
+
+	if (parms->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+		return -EINVAL;
+
+	if (info->tpf.numerator == 0)
+		return -EINVAL;
+
+	info->capture_mode = cp->capturemode;
+
+	return 0;
+}
+
+/**
+* @short Get stream parameters
+* @param[in] subdev v4l2 subdev
+* @param[in] parms stream parameters
+* @return Error code
+*/
+static int sensor_g_parm(struct v4l2_subdev *subdev,
+				struct v4l2_streamparm *parms)
+{
+	struct v4l2_captureparm *cp = &parms->parm.capture;
+	struct ov5647 *info = to_state(subdev);
+
+	if (parms->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+		return -EINVAL;
+
+	memset(cp, 0, sizeof(struct v4l2_captureparm));
+	cp->capability = V4L2_CAP_TIMEPERFRAME;
+	cp->capturemode = info->capture_mode;
+
+	return 0;
+}
+
+static const struct v4l2_subdev_pad_ops ov7670_pad_ops = {
+	.enum_mbus_code	= sensor_enum_fmt,
+	.set_fmt	= sensor_s_fmt,
+};
+
+/**
+ * @short Subdev video operations registration
+ *
+ */
+static const struct v4l2_subdev_video_ops sensor_video_ops = {
+	.s_parm		= sensor_s_parm,
+	.g_parm		= sensor_g_parm,
+};
+
+/* ----------------------------------------------------------------------- */
+
+/**
+ * @short Subdev operations registration
+ *
+ */
+static const struct v4l2_subdev_ops subdev_ops = {
+	.core			= &sensor_core_ops,
+	.video			= &sensor_video_ops,
+};
+
+/* -----------------------------------------------------------------------------
+ * V4L2 subdev internal operations
+ */
+
+/**
+* @short Detect camera version and model
+* @param[in] subdev v4l2 subdev
+* @return Error code
+*/
+int ov5647_detect(struct v4l2_subdev *sd)
+{
+	unsigned char v;
+	int ret;
+
+	ret = sensor_power(sd, 1);
+	if (ret < 0)
+		return ret;
+	ret = ov5647_read(sd, OV5647_REG_CHIPID_H, &v);
+	if (ret < 0)
+		return ret;
+	if (v != 0x56) /* OV manuf. id. */
+		return -ENODEV;
+	ret = ov5647_read(sd, OV5647_REG_CHIPID_L, &v);
+	if (ret < 0)
+		return ret;
+	if (v != 0x47)
+		return -ENODEV;
+
+	ret = sensor_power(sd, 0);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+/**
+* @short Detect if camera is registered
+* @param[in] subdev v4l2 subdev
+* @return Error code
+*/
+static int ov5647_registered(struct v4l2_subdev *subdev)
+{
+	struct i2c_client *client = v4l2_get_subdevdata(subdev);
+
+	v4l2_info(subdev, "OV5647 detected at address 0x%02x\n", client->addr);
+
+	return 0;
+}
+
+/**
+* @short Open device
+* @param[in] subdev v4l2 subdev
+* @param[in] fh v4l2 file handler
+* @return Error code
+*/
+static int ov5647_open(struct v4l2_subdev *subdev, struct v4l2_subdev_fh *fh)
+{
+	struct v4l2_mbus_framefmt *format =
+				v4l2_subdev_get_try_format(subdev, fh->pad, 0);
+	struct v4l2_rect *crop =
+				v4l2_subdev_get_try_crop(subdev, fh->pad, 0);
+
+	crop->left = OV5647_COLUMN_START_DEF;
+	crop->top = OV5647_ROW_START_DEF;
+	crop->width = OV5647_WINDOW_WIDTH_DEF;
+	crop->height = OV5647_WINDOW_HEIGHT_DEF;
+
+	format->code = MEDIA_BUS_FMT_SBGGR8_1X8;
+
+	format->width = OV5647_WINDOW_WIDTH_DEF;
+	format->height = OV5647_WINDOW_HEIGHT_DEF;
+	format->field = V4L2_FIELD_NONE;
+	format->colorspace = V4L2_COLORSPACE_SRGB;
+
+	return sensor_power(subdev, 1);
+}
+
+/**
+* @short Open device
+* @param[in] subdev v4l2 subdev
+* @param[in] fh v4l2 file handler
+* @return Error code
+*/
+static int ov5647_close(struct v4l2_subdev *subdev, struct v4l2_subdev_fh *fh)
+{
+	return sensor_power(subdev, 0);
+}
+
+/**
+ * @short Subdev internal operations registration
+ *
+ */
+static const struct v4l2_subdev_internal_ops ov5647_subdev_internal_ops = {
+	.registered = ov5647_registered,
+	.open = ov5647_open,
+	.close = ov5647_close,
+};
+
+/**
+* @short Initialization routine - Entry point of the driver
+* @param[in] client pointer to the i2c client structure
+* @param[in] id pointer to the i2c device id structure
+* @return 0 on success and a negative number on failure
+* Refer to Linux errors.
+*/
+static int ov5647_probe(struct i2c_client *client,
+			const struct i2c_device_id *id)
+{
+	struct device *dev = &client->dev;
+	struct ov5647 *sensor;
+	int ret = 0;
+	struct v4l2_subdev *sd;
+
+	pr_info("Installing OmniVision OV5647 camera driver\n");
+
+	sensor = devm_kzalloc(dev, sizeof(*sensor), GFP_KERNEL);
+	if (sensor == NULL)
+		return -ENOMEM;
+
+	mutex_init(&sensor->lock);
+	sensor->dev = dev;
+
+	sd = &sensor->subdev;
+	v4l2_i2c_subdev_init(sd, client, &subdev_ops);
+	sensor->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
+
+	sensor->pad.flags = MEDIA_PAD_FL_SOURCE;
+	sd->entity.function = MEDIA_ENT_F_CAM_SENSOR;
+	ret = media_entity_pads_init(&sd->entity, 1, &sensor->pad);
+	if (ret < 0)
+		return ret;
+
+	ret = v4l2_async_register_subdev(sd);
+	if (ret < 0)
+		media_entity_cleanup(&sd->entity);
+
+	return ret;
+}
+
+/**
+* @short Exit routine - Exit point of the driver
+* @param[in] client pointer to the i2c clietn structure
+* @return 0 on success and a negative number on failure
+* Refer to Linux errors.
+*/
+static int ov5647_remove(struct i2c_client *client)
+{
+	struct v4l2_subdev *subdev = i2c_get_clientdata(client);
+	struct ov5647 *ov5647 = to_state(subdev);
+
+	v4l2_async_unregister_subdev(&ov5647->subdev);
+	media_entity_cleanup(&ov5647->subdev.entity);
+	v4l2_device_unregister_subdev(subdev);
+
+	return 0;
+}
+
+/**
+* @short of_device_id structure
+*/
+static const struct i2c_device_id ov5647_id[] = {
+	{ "ov5647", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, ov5647_id);
+
+#if IS_ENABLED(CONFIG_OF)
+static const struct of_device_id ov5647_of_match[] = {
+	{ .compatible = "ovti,ov5647" },
+	{ /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, ov5647_of_match);
+#endif
+
+/**
+* @short i2c driver structure
+*/
+static struct i2c_driver ov5647_driver = {
+	.driver = {
+		.of_match_table = of_match_ptr(ov5647_of_match),
+		.owner	= THIS_MODULE,
+		.name	= "ov5647",
+	},
+	.probe		= ov5647_probe,
+	.remove		= ov5647_remove,
+	.id_table	= ov5647_id,
+};
+
+module_i2c_driver(ov5647_driver);
+
+MODULE_AUTHOR("Ramiro Oliveira <roliveir@...opsys.com>");
+MODULE_DESCRIPTION("A low-level driver for OmniVision ov5647 sensors");
+MODULE_LICENSE("GPL");
-- 
2.9.3

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