Date:   Fri, 13 Nov 2020 14:44:17 +0100
From:   Maxime Chevallier <maxime.chevallier@...tlin.com>
To:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Heiko Stuebner <heiko@...ech.de>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Ezequiel Garcia <ezequiel@...guardiasur.com.ar>
Cc:     Maxime Chevallier <maxime.chevallier@...tlin.com>,
        linux-media@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Paul Kocialkowski <paul.kocialkowski@...tlin.com>
Subject: [PATCH v2 3/3] media: i2c: Introduce a driver for the Techwell TW9900 decoder

The Techwell video decoder supports PAL, NTSC and SECAM input formats,
and outputs a BT.656 signal.

This commit adds support for this device, with basic support for NTSC
and PAL, along with brightness and contrast controls.

Signed-off-by: Maxime Chevallier <maxime.chevallier@...tlin.com>
---
v1 -> v2: Set the media entity type to decoder, and implement the
s_std/g_std ops

 MAINTAINERS                |   6 +
 drivers/media/i2c/Kconfig  |   9 +
 drivers/media/i2c/Makefile |   1 +
 drivers/media/i2c/tw9900.c | 661 +++++++++++++++++++++++++++++++++++++
 4 files changed, 677 insertions(+)
 create mode 100644 drivers/media/i2c/tw9900.c

diff --git a/MAINTAINERS b/MAINTAINERS
index 3da6d8c154e4..2890862a8285 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -17160,6 +17160,12 @@ L:	linux-media@...r.kernel.org
 S:	Maintained
 F:	drivers/media/rc/ttusbir.c
 
+TECHWELL TW9900 VIDEO DECODER
+M:	Maxime Chevallier <maxime.chevallier@...tlin.com>
+L:	linux-media@...r.kernel.org
+S:	Maintained
+F:	drivers/media/i2c/tw9900.c
+
 TECHWELL TW9910 VIDEO DECODER
 L:	linux-media@...r.kernel.org
 S:	Orphan
diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
index 878f66ef2719..ea55aea4d949 100644
--- a/drivers/media/i2c/Kconfig
+++ b/drivers/media/i2c/Kconfig
@@ -426,6 +426,15 @@ config VIDEO_TW2804
 	  To compile this driver as a module, choose M here: the
 	  module will be called tw2804.
 
+config VIDEO_TW9900
+	tristate "Techwell TW9900 video decoder"
+	depends on VIDEO_V4L2 && I2C
+	help
+	  Support for the Techwell tw9900 multi-standard video decoder.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called tw9900.
+
 config VIDEO_TW9903
 	tristate "Techwell TW9903 video decoder"
 	depends on VIDEO_V4L2 && I2C
diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile
index f0a77473979d..cbc1d9aedd38 100644
--- a/drivers/media/i2c/Makefile
+++ b/drivers/media/i2c/Makefile
@@ -49,6 +49,7 @@ obj-$(CONFIG_VIDEO_TVP5150) += tvp5150.o
 obj-$(CONFIG_VIDEO_TVP514X) += tvp514x.o
 obj-$(CONFIG_VIDEO_TVP7002) += tvp7002.o
 obj-$(CONFIG_VIDEO_TW2804) += tw2804.o
+obj-$(CONFIG_VIDEO_TW9900) += tw9900.o
 obj-$(CONFIG_VIDEO_TW9903) += tw9903.o
 obj-$(CONFIG_VIDEO_TW9906) += tw9906.o
 obj-$(CONFIG_VIDEO_TW9910) += tw9910.o
diff --git a/drivers/media/i2c/tw9900.c b/drivers/media/i2c/tw9900.c
new file mode 100644
index 000000000000..2075c3c120af
--- /dev/null
+++ b/drivers/media/i2c/tw9900.c
@@ -0,0 +1,661 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Driver for the Techwell TW9900 multi-standard video decoder.
+ *
+ * Copyright (C) 2018 Fuzhou Rockchip Electronics Co., Ltd.
+ * Copyright (C) 2020 Maxime Chevallier <maxime.chevallier@...tlin.com>
+ */
+
+#include <linux/clk.h>
+#include <linux/device.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 <linux/timer.h>
+#include <linux/delay.h>
+#include <media/media-entity.h>
+#include <media/v4l2-async.h>
+#include <media/v4l2-ctrls.h>
+#include <media/v4l2-event.h>
+#include <media/v4l2-subdev.h>
+
+#define TW9900_REG_CHIP_ID	0x00
+#define TW9900_REG_CHIP_STATUS  0x01
+#define		TW9900_REG_CHIP_STATUS_VLOCK	0x08
+#define		TW9900_REG_CHIP_STATUS_VDLOSS	0x80
+#define TW9900_REG_OUT_FMT_CTL  0x03
+#define TW9900_REG_CKHY_HSDLY   0x04
+#define TW9900_REG_OUT_CTRL_I	0x05
+#define TW9900_REG_ANALOG_CTL   0x06
+#define TW9900_REG_CROP_HI	0x07
+#define TW9900_REG_VDELAY_LO    0x08
+#define TW9900_REG_VACTIVE_LO   0x09
+#define TW9900_REG_HACTIVE_LO	0x0B
+#define TW9900_REG_CNTRL1	0x0C
+#define TW9900_REG_BRIGHT_CTL   0x10
+#define TW9900_REG_CONTRAST_CTL 0x11
+#define TW9900_REG_VBI_CNTL	0x19
+#define TW9900_REG_ANAL_CTL_II  0x1A
+#define TW9900_REG_OUT_CTRL_II	0x1B
+#define TW9900_REG_STD_SEL      0x1C
+#define TW9900_REG_MISSCNT      0x26
+#define TW9900_REG_MISC_CTL_II  0x2F
+#define TW9900_REG_VVBI         0x55
+
+#define TW9900_CHIP_ID		0x00
+
+#define REG_SC_CTRL_MODE		TW9900_REG_OUT_FMT_CTL
+#define     SC_CTRL_MODE_STANDBY	0xA7
+#define     SC_CTRL_MODE_STREAMING	0xA0
+
+#define REG_NULL			0xFF
+
+#define VSYNC_POLL_INTERVAL_MS  20
+#define VSYNC_WAIT_MAX_POLLS    50
+
+static const char * const tw9900_supply_names[] = {
+	"vdd",
+};
+
+#define TW9900_NUM_SUPPLIES ARRAY_SIZE(tw9900_supply_names)
+
+struct regval {
+	u8 addr;
+	u8 val;
+};
+
+struct tw9900_mode {
+	u32 width;
+	u32 height;
+	u32 skip_top;
+	u32 std;
+	u32 field;
+	const struct regval *reg_list;
+};
+
+struct tw9900 {
+	struct i2c_client	*client;
+	struct gpio_desc	*reset_gpio;
+	struct regulator_bulk_data supplies[TW9900_NUM_SUPPLIES];
+
+	bool			streaming;
+
+	struct v4l2_subdev	subdev;
+	struct v4l2_ctrl_handler hdl;
+	struct media_pad	pad;
+
+	struct timer_list timer;
+	struct work_struct work_i2c_poll;
+
+	const struct tw9900_mode *cur_mode;
+};
+
+#define to_tw9900(sd) container_of(sd, struct tw9900, subdev)
+
+static const struct regval tw9900_init_regs[] = {
+	{TW9900_REG_MISC_CTL_II,	0xE6},
+	{TW9900_REG_MISSCNT,		0x24},
+	{TW9900_REG_OUT_FMT_CTL,	0xA7},
+	{TW9900_REG_ANAL_CTL_II,	0x0A},
+	{TW9900_REG_VDELAY_LO,		0x19},
+	{TW9900_REG_STD_SEL,		0x00},
+	{TW9900_REG_VACTIVE_LO,		0xF0},
+	{TW9900_REG_STD_SEL,		0x07},
+	{TW9900_REG_CKHY_HSDLY,		0x40},
+	{TW9900_REG_ANALOG_CTL,		0x80},
+	{TW9900_REG_CNTRL1,		0xdc},
+	{TW9900_REG_OUT_CTRL_I,		0x98},
+	{REG_NULL, 0x0},
+};
+
+static const struct regval tw9900_pal_regs[] = {
+	{TW9900_REG_STD_SEL, 0x01},
+	{REG_NULL, 0x0},
+};
+
+static const struct regval tw9900_ntsc_regs[] = {
+	{TW9900_REG_OUT_FMT_CTL, 0xA4},
+	{TW9900_REG_VDELAY_LO, 0x12},
+	{TW9900_REG_VACTIVE_LO, 0xf0},
+	{TW9900_REG_CROP_HI, 0x02},
+	{TW9900_REG_HACTIVE_LO, 0xD0},
+	{TW9900_REG_VBI_CNTL, 0x01},
+	{TW9900_REG_STD_SEL, 0x00},
+	{REG_NULL, 0x0},
+};
+
+static const struct tw9900_mode supported_modes[] = {
+	{
+		.width = 720,
+		.height = 576,
+		.skip_top = 0,
+		.std = V4L2_STD_PAL,
+		.field = V4L2_FIELD_NONE,
+		.reg_list = tw9900_pal_regs,
+	},
+	{
+		.width = 720,
+		.height = 480,
+		.skip_top = 0,
+		.std = V4L2_STD_NTSC,
+		.field = V4L2_FIELD_NONE,
+		.reg_list = tw9900_ntsc_regs,
+	},
+};
+
+static int tw9900_write_reg(struct i2c_client *client, u8 reg, u8 val)
+{
+	int ret;
+
+	ret = i2c_smbus_write_byte_data(client, reg, val);
+
+	if (ret < 0)
+		dev_err(&client->dev, "write reg error: %d\n", ret);
+
+	return ret;
+}
+
+static int tw9900_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 = tw9900_write_reg(client, regs[i].addr, regs[i].val);
+
+	return ret;
+}
+
+static inline u8 tw9900_read_reg(struct i2c_client *client, u8 reg)
+{
+	return i2c_smbus_read_byte_data(client, reg);
+}
+
+static void tw9900_fill_fmt(const struct tw9900_mode *mode,
+			    struct v4l2_mbus_framefmt *fmt)
+{
+	fmt->code = MEDIA_BUS_FMT_UYVY8_2X8;
+	fmt->width = mode->width;
+	fmt->height = mode->height;
+	fmt->field = mode->field;
+	fmt->colorspace = V4L2_COLORSPACE_SMPTE170M;
+}
+
+static int tw9900_set_fmt(struct v4l2_subdev *sd,
+			  struct v4l2_subdev_pad_config *cfg,
+			  struct v4l2_subdev_format *fmt)
+{
+	struct tw9900 *tw9900 = to_tw9900(sd);
+	struct v4l2_mbus_framefmt *mbus_fmt = &fmt->format;
+
+	tw9900_fill_fmt(tw9900->cur_mode, mbus_fmt);
+
+	mbus_fmt->width = tw9900->cur_mode->width;
+	mbus_fmt->height = tw9900->cur_mode->height;
+
+	return 0;
+}
+
+static int tw9900_get_fmt(struct v4l2_subdev *sd,
+			  struct v4l2_subdev_pad_config *cfg,
+			  struct v4l2_subdev_format *fmt)
+{
+	struct tw9900 *tw9900 = to_tw9900(sd);
+	struct v4l2_mbus_framefmt *mbus_fmt = &fmt->format;
+
+	tw9900_fill_fmt(tw9900->cur_mode, mbus_fmt);
+
+	return 0;
+}
+
+static int tw9900_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_UYVY8_2X8;
+
+	return 0;
+}
+
+static int tw9900_enum_frame_sizes(struct v4l2_subdev *sd,
+				   struct v4l2_subdev_pad_config *cfg,
+				   struct v4l2_subdev_frame_size_enum *fse)
+{
+	u32 index = fse->index;
+
+	if (index >= ARRAY_SIZE(supported_modes))
+		return -EINVAL;
+
+	fse->code = MEDIA_BUS_FMT_UYVY8_2X8;
+
+	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 int __tw9900_power_on(struct tw9900 *tw9900)
+{
+	int ret;
+	struct device *dev = &tw9900->client->dev;
+
+	if (tw9900->reset_gpio)
+		gpiod_set_value_cansleep(tw9900->reset_gpio, 1);
+
+	ret = regulator_bulk_enable(TW9900_NUM_SUPPLIES, tw9900->supplies);
+	if (ret < 0)
+		goto error;
+
+	usleep_range(50000, 52000);
+
+	if (tw9900->reset_gpio)
+		gpiod_set_value_cansleep(tw9900->reset_gpio, 0);
+
+	usleep_range(1000, 2000);
+
+	ret = tw9900_write_array(tw9900->client, tw9900_init_regs);
+	if (ret) {
+		dev_err(dev, "Failed to init tw9900\n");
+		goto error;
+	}
+
+	return 0;
+
+error:
+
+	return ret;
+}
+
+static void __tw9900_power_off(struct tw9900 *tw9900)
+{
+	if (tw9900->reset_gpio)
+		gpiod_set_value_cansleep(tw9900->reset_gpio, 1);
+
+	regulator_bulk_disable(TW9900_NUM_SUPPLIES, tw9900->supplies);
+}
+
+static int tw9900_s_ctrl(struct v4l2_ctrl *ctrl)
+{
+	struct tw9900 *tw9900 = container_of(ctrl->handler, struct tw9900, hdl);
+
+	if (pm_runtime_suspended(&tw9900->client->dev))
+		return 0;
+
+	switch (ctrl->id) {
+	case V4L2_CID_BRIGHTNESS:
+		tw9900_write_reg(tw9900->client, 0x10, (u8)ctrl->val);
+		break;
+	case V4L2_CID_CONTRAST:
+		tw9900_write_reg(tw9900->client, 0x11, (u8)ctrl->val);
+		break;
+	default:
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static int tw9900_s_stream(struct v4l2_subdev *sd, int on)
+{
+	struct tw9900 *tw9900 = to_tw9900(sd);
+	struct i2c_client *client = tw9900->client;
+	int i, ret = 0;
+
+	on = !!on;
+	if (on == tw9900->streaming)
+		goto unlock_and_return;
+
+	if (on) {
+		ret = pm_runtime_get_sync(&tw9900->client->dev);
+		if (ret < 0) {
+			pm_runtime_put_noidle(&client->dev);
+			goto unlock_and_return;
+		}
+
+		ret = v4l2_ctrl_handler_setup(sd->ctrl_handler);
+		if (ret) {
+			pm_runtime_put(&client->dev);
+			goto unlock_and_return;
+		}
+
+		ret = tw9900_write_array(tw9900->client,
+					 tw9900->cur_mode->reg_list);
+		if (ret) {
+			pm_runtime_put(&client->dev);
+			goto unlock_and_return;
+		}
+
+		/* Wait for VSync lock */
+		for (i = 0; i < VSYNC_WAIT_MAX_POLLS; i++) {
+			u8 status = tw9900_read_reg(tw9900->client,
+						    TW9900_REG_CHIP_STATUS);
+			if (!(status & TW9900_REG_CHIP_STATUS_VDLOSS) &&
+			    (status & TW9900_REG_CHIP_STATUS_VLOCK))
+				break;
+
+			msleep(VSYNC_POLL_INTERVAL_MS);
+		}
+
+		ret = tw9900_write_reg(client, REG_SC_CTRL_MODE,
+				       SC_CTRL_MODE_STREAMING);
+		if (ret) {
+			pm_runtime_put(&client->dev);
+			goto unlock_and_return;
+		}
+
+	} else {
+		tw9900_write_reg(client, REG_SC_CTRL_MODE,
+				 SC_CTRL_MODE_STANDBY);
+		pm_runtime_put(&client->dev);
+	}
+
+	tw9900->streaming = on;
+
+unlock_and_return:
+
+	return ret;
+}
+
+#ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
+static int tw9900_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
+{
+	struct tw9900 *tw9900 = to_tw9900(sd);
+	struct v4l2_mbus_framefmt *try_fmt;
+
+	try_fmt = v4l2_subdev_get_try_format(sd, fh->pad, 0);
+
+	/* Initialize try_fmt */
+	tw9900_fill_fmt(tw9900->cur_mode, try_fmt);
+
+	return 0;
+}
+#endif
+
+static int tw9900_runtime_resume(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct v4l2_subdev *sd = i2c_get_clientdata(client);
+	struct tw9900 *tw9900 = to_tw9900(sd);
+
+	return __tw9900_power_on(tw9900);
+}
+
+static int tw9900_runtime_suspend(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct v4l2_subdev *sd = i2c_get_clientdata(client);
+	struct tw9900 *tw9900 = to_tw9900(sd);
+
+	__tw9900_power_off(tw9900);
+
+	return 0;
+}
+
+static int tw9900_subscribe_event(struct v4l2_subdev *sd,
+				  struct v4l2_fh *fh,
+				  struct v4l2_event_subscription *sub)
+{
+	switch (sub->type) {
+	case V4L2_EVENT_SOURCE_CHANGE:
+		return v4l2_src_change_event_subdev_subscribe(sd, fh, sub);
+	case V4L2_EVENT_CTRL:
+		return v4l2_ctrl_subdev_subscribe_event(sd, fh, sub);
+	default:
+		return -EINVAL;
+	}
+}
+
+static const struct tw9900_mode *tw9900_get_mode_from_std(v4l2_std_id std)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(supported_modes); i++) {
+		if (supported_modes[i].std == std)
+			return &supported_modes[i];
+	}
+
+	return NULL;
+}
+
+static int tw9900_s_std(struct v4l2_subdev *sd, v4l2_std_id norm)
+{
+	struct tw9900 *tw9900 = to_tw9900(sd);
+	const struct tw9900_mode *mode;
+	int ret;
+
+	if (!(norm & (V4L2_STD_NTSC | V4L2_STD_PAL)))
+		return -EINVAL;
+
+	mode = tw9900_get_mode_from_std(norm);
+	if (!mode)
+		return -EINVAL;
+
+	ret = tw9900_write_array(tw9900->client, mode->reg_list);
+
+	if (ret)
+		return ret;
+
+	tw9900->cur_mode = mode;
+
+	return 0;
+}
+
+static int tw9900_g_std(struct v4l2_subdev *sd, v4l2_std_id *norm)
+{
+	struct tw9900 *tw9900 = to_tw9900(sd);
+
+	*norm = tw9900->cur_mode->std;
+
+	return 0;
+}
+
+static const struct dev_pm_ops tw9900_pm_ops = {
+	SET_RUNTIME_PM_OPS(tw9900_runtime_suspend,
+			   tw9900_runtime_resume, NULL)
+};
+
+static const struct v4l2_subdev_core_ops tw9900_core_ops = {
+	.subscribe_event = tw9900_subscribe_event,
+	.unsubscribe_event = v4l2_event_subdev_unsubscribe,
+};
+
+static const struct v4l2_subdev_video_ops tw9900_video_ops = {
+	.s_std		= tw9900_s_std,
+	.g_std		= tw9900_g_std,
+	.s_stream	= tw9900_s_stream,
+};
+
+static const struct v4l2_subdev_pad_ops tw9900_pad_ops = {
+	.enum_mbus_code = tw9900_enum_mbus_code,
+	.enum_frame_size = tw9900_enum_frame_sizes,
+	.get_fmt = tw9900_get_fmt,
+	.set_fmt = tw9900_set_fmt,
+};
+
+static const struct v4l2_subdev_ops tw9900_subdev_ops = {
+	.core	= &tw9900_core_ops,
+	.video	= &tw9900_video_ops,
+	.pad	= &tw9900_pad_ops,
+};
+
+static const struct v4l2_ctrl_ops tw9900_ctrl_ops = {
+	.s_ctrl = tw9900_s_ctrl,
+};
+
+#ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
+static const struct v4l2_subdev_internal_ops tw9900_internal_ops = {
+	.open = tw9900_open,
+};
+#endif
+
+static int tw9900_check_id(struct tw9900 *tw9900,
+			   struct i2c_client *client)
+{
+	struct device *dev = &tw9900->client->dev;
+	u8 id;
+
+	id = tw9900_read_reg(client, TW9900_CHIP_ID);
+
+	if (id != TW9900_CHIP_ID) {
+		dev_err(dev, "Unexpected decoder id(%04x)\n", id);
+		return -EINVAL;
+	}
+
+	dev_info(dev, "Detected TW9900 (%04x) decoder\n", TW9900_CHIP_ID);
+
+	return 0;
+}
+
+static int tw9900_configure_regulators(struct tw9900 *tw9900)
+{
+	u32 i;
+
+	for (i = 0; i < TW9900_NUM_SUPPLIES; i++)
+		tw9900->supplies[i].supply = tw9900_supply_names[i];
+
+	return devm_regulator_bulk_get(&tw9900->client->dev,
+				       TW9900_NUM_SUPPLIES,
+				       tw9900->supplies);
+}
+
+static int tw9900_probe(struct i2c_client *client,
+			const struct i2c_device_id *id)
+{
+	struct device *dev = &client->dev;
+	struct v4l2_ctrl_handler *hdl;
+	struct tw9900 *tw9900;
+	int ret;
+
+	tw9900 = devm_kzalloc(dev, sizeof(*tw9900), GFP_KERNEL);
+	if (!tw9900)
+		return -ENOMEM;
+
+	tw9900->client = client;
+	tw9900->cur_mode = &supported_modes[0];
+
+	tw9900->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
+	if (IS_ERR(tw9900->reset_gpio))
+		tw9900->reset_gpio = NULL;
+
+	ret = tw9900_configure_regulators(tw9900);
+	if (ret) {
+		dev_err(dev, "Failed to get power regulators\n");
+		return ret;
+	}
+
+	v4l2_i2c_subdev_init(&tw9900->subdev, client, &tw9900_subdev_ops);
+	tw9900->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE | V4L2_SUBDEV_FL_HAS_EVENTS;
+
+	hdl = &tw9900->hdl;
+
+	v4l2_ctrl_handler_init(hdl, 2);
+
+	v4l2_ctrl_new_std(hdl, &tw9900_ctrl_ops, V4L2_CID_BRIGHTNESS,
+			  -128, 127, 1, 0);
+	v4l2_ctrl_new_std(hdl, &tw9900_ctrl_ops, V4L2_CID_CONTRAST,
+			  0, 255, 1, 0x60);
+
+	tw9900->subdev.ctrl_handler = hdl;
+	if (hdl->error) {
+		int err = hdl->error;
+
+		v4l2_ctrl_handler_free(hdl);
+		return err;
+	}
+
+	ret = __tw9900_power_on(tw9900);
+	if (ret)
+		return ret;
+
+	ret = tw9900_check_id(tw9900, client);
+	if (ret)
+		goto err_power_off;
+
+#ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
+	tw9900->subdev.internal_ops = &tw9900_internal_ops;
+	tw9900->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
+#endif
+#if defined(CONFIG_MEDIA_CONTROLLER)
+	tw9900->pad.flags = MEDIA_PAD_FL_SOURCE;
+	tw9900->subdev.entity.function = MEDIA_ENT_F_DV_DECODER;
+
+	ret = media_entity_pads_init(&tw9900->subdev.entity, 1, &tw9900->pad);
+	if (ret < 0)
+		goto err_power_off;
+#endif
+
+	ret = v4l2_async_register_subdev(&tw9900->subdev);
+	if (ret) {
+		dev_err(dev, "v4l2 async register subdev failed\n");
+		goto err_clean_entity;
+	}
+
+	pm_runtime_set_active(dev);
+	pm_runtime_enable(dev);
+	pm_runtime_idle(dev);
+
+	return 0;
+
+err_clean_entity:
+#if defined(CONFIG_MEDIA_CONTROLLER)
+	media_entity_cleanup(&tw9900->subdev.entity);
+#endif
+err_power_off:
+	__tw9900_power_off(tw9900);
+
+	return ret;
+}
+
+static int tw9900_remove(struct i2c_client *client)
+{
+	struct v4l2_subdev *sd = i2c_get_clientdata(client);
+	struct tw9900 *tw9900 = to_tw9900(sd);
+
+	v4l2_async_unregister_subdev(sd);
+#if defined(CONFIG_MEDIA_CONTROLLER)
+	media_entity_cleanup(&sd->entity);
+#endif
+
+	pm_runtime_disable(&client->dev);
+	if (!pm_runtime_status_suspended(&client->dev))
+		__tw9900_power_off(tw9900);
+	pm_runtime_set_suspended(&client->dev);
+
+	return 0;
+}
+
+static const struct i2c_device_id tw9900_id[] = {
+	{"tw9900", 0},
+	{},
+};
+
+#if IS_ENABLED(CONFIG_OF)
+static const struct of_device_id tw9900_of_match[] = {
+	{ .compatible = "techwell,tw9900" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, tw9900_of_match);
+#endif
+
+static struct i2c_driver tw9900_i2c_driver = {
+	.driver = {
+		.name = "tw9900",
+		.pm = &tw9900_pm_ops,
+		.of_match_table = tw9900_of_match
+	},
+	.probe		= tw9900_probe,
+	.remove		= tw9900_remove,
+	.id_table	= tw9900_id,
+};
+
+module_i2c_driver(tw9900_i2c_driver);
+
+MODULE_DESCRIPTION("tw9900 decoder driver");
+MODULE_LICENSE("GPL v2");
-- 
2.25.4

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