[PATCH v4 3/3] media: i2c: Introduce a driver for the Techwell TW9900 decoder
From: Maxime Chevallier
Date: Fri Feb 19 2021 - 03:28:08 EST
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@xxxxxxxxxxx>
---
v1 -> v2: Set the media entity type to decoder, and implement the
s_std/g_std ops
V2 ->V3 : Fix coding-style issues, and remove the use of the bulk API
for regulators. Make the driver select the media-controller and
V4L2-subdev APIs.
V3->V4: Fix a warning about an uninitialized ret variable in probe()
MAINTAINERS | 6 +
drivers/media/i2c/Kconfig | 11 +
drivers/media/i2c/Makefile | 1 +
drivers/media/i2c/tw9900.c | 617 +++++++++++++++++++++++++++++++++++++
4 files changed, 635 insertions(+)
create mode 100644 drivers/media/i2c/tw9900.c
diff --git a/MAINTAINERS b/MAINTAINERS
index bfc1b86e3e73..dde9f7bdd720 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -17425,6 +17425,12 @@ L: linux-media@xxxxxxxxxxxxxxx
S: Maintained
F: drivers/media/rc/ttusbir.c
+TECHWELL TW9900 VIDEO DECODER
+M: Maxime Chevallier <maxime.chevallier@xxxxxxxxxxx>
+L: linux-media@xxxxxxxxxxxxxxx
+S: Maintained
+F: drivers/media/i2c/tw9900.c
+
TECHWELL TW9910 VIDEO DECODER
L: linux-media@xxxxxxxxxxxxxxx
S: Orphan
diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
index 2b9d81e4794a..5f902557c8e5 100644
--- a/drivers/media/i2c/Kconfig
+++ b/drivers/media/i2c/Kconfig
@@ -426,6 +426,17 @@ 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
+ select MEDIA_CONTROLLER
+ select VIDEO_V4L2_SUBDEV_API
+ 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 a3149dce21bb..9e7df99201c6 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..635268211982
--- /dev/null
+++ b/drivers/media/i2c/tw9900.c
@@ -0,0 +1,617 @@
+// 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@xxxxxxxxxxx>
+ */
+
+#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_OUT_FMT_CTL_STANDBY 0xA7
+#define TW9900_REG_OUT_FMT_CTL_STREAMING 0xA0
+#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 VSYNC_POLL_INTERVAL_MS 20
+#define VSYNC_WAIT_MAX_POLLS 50
+
+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;
+ int n_regs;
+};
+
+struct tw9900 {
+ struct i2c_client *client;
+ struct gpio_desc *reset_gpio;
+ struct regulator *regulator;
+
+ 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 },
+};
+
+static const struct regval tw9900_pal_regs[] = {
+ { TW9900_REG_STD_SEL, 0x01 },
+};
+
+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 },
+};
+
+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,
+ .n_regs = ARRAY_SIZE(tw9900_pal_regs),
+ },
+ {
+ .width = 720,
+ .height = 480,
+ .skip_top = 0,
+ .std = V4L2_STD_NTSC,
+ .field = V4L2_FIELD_NONE,
+ .reg_list = tw9900_ntsc_regs,
+ .n_regs = ARRAY_SIZE(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 n_regs)
+{
+ int i, ret = 0;
+
+ for (i = 0; ret == 0 && i <= n_regs; 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 >= 1)
+ 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 >= 1)
+ 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_enable(tw9900->regulator);
+ 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,
+ ARRAY_SIZE(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_disable(tw9900->regulator);
+}
+
+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)
+ return 0;
+
+ if (on) {
+ ret = pm_runtime_get_sync(&tw9900->client->dev);
+ if (ret < 0) {
+ pm_runtime_put_noidle(&client->dev);
+ return ret;
+ }
+
+ ret = v4l2_ctrl_handler_setup(sd->ctrl_handler);
+ if (ret)
+ goto put_and_return;
+
+ ret = tw9900_write_array(tw9900->client,
+ tw9900->cur_mode->reg_list,
+ tw9900->cur_mode->n_regs);
+ if (ret)
+ goto put_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, TW9900_REG_OUT_FMT_CTL,
+ TW9900_REG_OUT_FMT_CTL_STREAMING);
+ if (ret)
+ goto put_and_return;
+
+ } else {
+ tw9900_write_reg(client, TW9900_REG_OUT_FMT_CTL,
+ TW9900_REG_OUT_FMT_CTL_STANDBY);
+ pm_runtime_put(&client->dev);
+ }
+
+ tw9900->streaming = on;
+
+ return ret;
+
+put_and_return:
+ pm_runtime_put(&client->dev);
+
+ return ret;
+}
+
+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;
+}
+
+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, mode->n_regs);
+ 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,
+};
+
+static const struct v4l2_subdev_internal_ops tw9900_internal_ops = {
+ .open = tw9900_open,
+};
+
+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_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 = 0;
+
+ 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;
+
+ tw9900->regulator = devm_regulator_get(&tw9900->client->dev, "vdd");
+ if (IS_ERR(tw9900->regulator)) {
+ dev_err(dev, "Failed to get power regulator\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;
+
+ tw9900->subdev.internal_ops = &tw9900_internal_ops;
+ tw9900->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
+ 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;
+
+ 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:
+ media_entity_cleanup(&tw9900->subdev.entity);
+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);
+ media_entity_cleanup(&sd->entity);
+
+ 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 of_device_id tw9900_of_match[] = {
+ { .compatible = "techwell,tw9900" },
+ {},
+};
+MODULE_DEVICE_TABLE(of, tw9900_of_match);
+
+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,
+};
+
+module_i2c_driver(tw9900_i2c_driver);
+
+MODULE_DESCRIPTION("tw9900 decoder driver");
+MODULE_LICENSE("GPL v2");
--
2.25.4