[PATCH v14 2/2] media: i2c: Add OV02A10 image sensor driver
Andy Shevchenko
andriy.shevchenko at linux.intel.com
Wed Sep 2 09:44:21 EDT 2020
On Wed, Sep 02, 2020 at 08:01:22PM +0800, Dongchun Zhu wrote:
> Add a V4L2 sub-device driver for OmniVision OV02A10 image sensor.
>
Some nit-picks below, after addressing, FWIW,
Reviewed-by: Andy Shevchenko <andriy.shevchenko at linux.intel.com>
> Signed-off-by: Dongchun Zhu <dongchun.zhu at mediatek.com>
> ---
> MAINTAINERS | 1 +
> drivers/media/i2c/Kconfig | 13 +
> drivers/media/i2c/Makefile | 1 +
> drivers/media/i2c/ov02a10.c | 1083 +++++++++++++++++++++++++++++++++++++++++++
> 4 files changed, 1098 insertions(+)
> create mode 100644 drivers/media/i2c/ov02a10.c
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 48aa7a7..ce7d8fa 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -12724,6 +12724,7 @@ L: linux-media at vger.kernel.org
> S: Maintained
> T: git git://linuxtv.org/media_tree.git
> F: Documentation/devicetree/bindings/media/i2c/ovti,ov02a10.yaml
> +F: drivers/media/i2c/ov02a10.c
>
> OMNIVISION OV13858 SENSOR DRIVER
> M: Sakari Ailus <sakari.ailus at linux.intel.com>
> diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
> index 48ae60a..f458804 100644
> --- a/drivers/media/i2c/Kconfig
> +++ b/drivers/media/i2c/Kconfig
> @@ -825,6 +825,19 @@ config VIDEO_IMX355
> To compile this driver as a module, choose M here: the
> module will be called imx355.
>
> +config VIDEO_OV02A10
> + tristate "OmniVision OV02A10 sensor support"
> + depends on I2C && VIDEO_V4L2
Dunno if V4L2 modules allow COMPILE_TEST, but looking below, can we stick with one pattern like
depends on VIDEO_V4L2 && I2C
?
Or is it the opposite (de facto in use)?
> + select MEDIA_CONTROLLER
> + select VIDEO_V4L2_SUBDEV_API
> + select V4L2_FWNODE
> + help
> + This is a Video4Linux2 sensor driver for the OmniVision
> + OV02A10 camera sensor.
> +
> + To compile this driver as a module, choose M here: the
> + module will be called ov02a10.
> +
> config VIDEO_OV2640
> tristate "OmniVision OV2640 sensor support"
> depends on VIDEO_V4L2 && I2C
> diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile
> index f0a7747..dc27e14 100644
> --- a/drivers/media/i2c/Makefile
> +++ b/drivers/media/i2c/Makefile
> @@ -64,6 +64,7 @@ obj-$(CONFIG_VIDEO_VP27SMPX) += vp27smpx.o
> obj-$(CONFIG_VIDEO_SONY_BTF_MPX) += sony-btf-mpx.o
> obj-$(CONFIG_VIDEO_UPD64031A) += upd64031a.o
> obj-$(CONFIG_VIDEO_UPD64083) += upd64083.o
> +obj-$(CONFIG_VIDEO_OV02A10) += ov02a10.o
> obj-$(CONFIG_VIDEO_OV2640) += ov2640.o
> obj-$(CONFIG_VIDEO_OV2680) += ov2680.o
> obj-$(CONFIG_VIDEO_OV2685) += ov2685.o
> diff --git a/drivers/media/i2c/ov02a10.c b/drivers/media/i2c/ov02a10.c
> new file mode 100644
> index 0000000..1f8c525
> --- /dev/null
> +++ b/drivers/media/i2c/ov02a10.c
> @@ -0,0 +1,1083 @@
> +// SPDX-License-Identifier: GPL-2.0
> +// Copyright (c) 2020 MediaTek Inc.
> +
> +#include <linux/clk.h>
> +#include <linux/delay.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 <media/media-entity.h>
> +#include <media/v4l2-async.h>
> +#include <media/v4l2-ctrls.h>
> +#include <media/v4l2-subdev.h>
> +#include <media/v4l2-fwnode.h>
> +
> +#define CHIP_ID 0x2509
> +#define OV02A10_REG_CHIP_ID_H 0x02
> +#define OV02A10_REG_CHIP_ID_L 0x03
> +
> +/* Bit[1] vertical upside down */
> +/* Bit[0] horizontal mirror */
> +#define REG_MIRROR_FLIP_CONTROL 0x3f
> +
> +/* Orientation */
> +#define REG_MIRROR_FLIP_ENABLE 0x03
> +
> +/* Bit[2:0] MIPI transmission speed select */
> +#define TX_SPEED_AREA_SEL 0xa1
> +#define OV02A10_MIPI_TX_SPEED_DEFAULT 0x04
> +
> +#define REG_PAGE_SWITCH 0xfd
> +#define REG_GLOBAL_EFFECTIVE 0x01
> +#define REG_ENABLE BIT(0)
> +
> +#define REG_SC_CTRL_MODE 0xac
> +#define SC_CTRL_MODE_STANDBY 0x00
> +#define SC_CTRL_MODE_STREAMING 0x01
> +
> +#define OV02A10_EXP_SHIFT 8
> +#define OV02A10_REG_EXPOSURE_H 0x03
> +#define OV02A10_REG_EXPOSURE_L 0x04
> +#define OV02A10_EXPOSURE_MIN 4
> +#define OV02A10_EXPOSURE_MAX_MARGIN 4
> +#define OV02A10_EXPOSURE_STEP 1
> +
> +#define OV02A10_VTS_SHIFT 8
> +#define OV02A10_REG_VTS_H 0x05
> +#define OV02A10_REG_VTS_L 0x06
> +#define OV02A10_VTS_MAX 0x209f
Hex? (1)
> +#define OV02A10_BASIC_LINE 1224
Decimal? (2)
> +
> +#define OV02A10_REG_GAIN 0x24
> +#define OV02A10_GAIN_MIN 0x10
> +#define OV02A10_GAIN_MAX 0xf8
> +#define OV02A10_GAIN_STEP 0x01
> +#define OV02A10_GAIN_DEFAULT 0x40
Not sure why these are in hex, but okay. Probably a reason behind (1) and (2)
as well.
> +/* Test pattern control */
> +#define OV02A10_REG_TEST_PATTERN 0xb6
I'm wondering if you can rearrange registers that they will be sorted by value.
> +#define HZ_PER_MHZ 1000000L
> +#define OV02A10_LINK_FREQ_390MHZ (390 * HZ_PER_MHZ)
> +#define OV02A10_ECLK_FREQ (24 * HZ_PER_MHZ)
> +#define OV02A10_DATA_LANES 1
> +#define OV02A10_BITS_PER_SAMPLE 10
> +
> +static const char * const ov02a10_supply_names[] = {
> + "dovdd", /* Digital I/O power */
> + "avdd", /* Analog power */
> + "dvdd", /* Digital core power */
> +};
> +
> +struct ov02a10_reg {
> + u8 addr;
> + u8 val;
> +};
> +
> +struct ov02a10_reg_list {
> + u32 num_of_regs;
> + const struct ov02a10_reg *regs;
> +};
> +
> +struct ov02a10_mode {
> + u32 width;
> + u32 height;
> + u32 exp_def;
> + u32 hts_def;
> + u32 vts_def;
> + const struct ov02a10_reg_list reg_list;
> +};
> +
> +struct ov02a10 {
> + u32 eclk_freq;
> + /* Indication of MIPI transmission speed select */
> + u32 mipi_clock_voltage;
> + /* Index of link frequency config to be used */
> + u32 freq_index;
> +
> + struct clk *eclk;
> + struct gpio_desc *pd_gpio;
> + struct gpio_desc *rst_gpio;
> + struct regulator_bulk_data supplies[ARRAY_SIZE(ov02a10_supply_names)];
> +
> + bool streaming;
> + bool upside_down;
> +
> + /*
> + * Serialize control access, get/set format, get selection
> + * and start streaming.
> + */
> + struct mutex mutex;
> + struct v4l2_subdev subdev;
> + struct media_pad pad;
> + struct v4l2_mbus_framefmt fmt;
> + struct v4l2_ctrl_handler ctrl_handler;
> + struct v4l2_ctrl *exposure;
> +
> + const struct ov02a10_mode *cur_mode;
> +};
> +
> +static inline struct ov02a10 *to_ov02a10(struct v4l2_subdev *sd)
> +{
> + return container_of(sd, struct ov02a10, subdev);
> +}
> +
> +/*
> + * eclk 24Mhz
> + * pclk 39Mhz
> + * linelength 934(0x3a6)
> + * framelength 1390(0x56E)
> + * grabwindow_width 1600
> + * grabwindow_height 1200
> + * max_framerate 30fps
> + * mipi_datarate per lane 780Mbps
> + */
> +static const struct ov02a10_reg ov02a10_1600x1200_regs[] = {
> + {0xfd, 0x01},
> + {0xac, 0x00},
> + {0xfd, 0x00},
> + {0x2f, 0x29},
> + {0x34, 0x00},
> + {0x35, 0x21},
> + {0x30, 0x15},
> + {0x33, 0x01},
> + {0xfd, 0x01},
> + {0x44, 0x00},
> + {0x2a, 0x4c},
> + {0x2b, 0x1e},
> + {0x2c, 0x60},
> + {0x25, 0x11},
> + {0x03, 0x01},
> + {0x04, 0xae},
> + {0x09, 0x00},
> + {0x0a, 0x02},
> + {0x06, 0xa6},
> + {0x31, 0x00},
> + {0x24, 0x40},
> + {0x01, 0x01},
> + {0xfb, 0x73},
> + {0xfd, 0x01},
> + {0x16, 0x04},
> + {0x1c, 0x09},
> + {0x21, 0x42},
> + {0x12, 0x04},
> + {0x13, 0x10},
> + {0x11, 0x40},
> + {0x33, 0x81},
> + {0xd0, 0x00},
> + {0xd1, 0x01},
> + {0xd2, 0x00},
> + {0x50, 0x10},
> + {0x51, 0x23},
> + {0x52, 0x20},
> + {0x53, 0x10},
> + {0x54, 0x02},
> + {0x55, 0x20},
> + {0x56, 0x02},
> + {0x58, 0x48},
> + {0x5d, 0x15},
> + {0x5e, 0x05},
> + {0x66, 0x66},
> + {0x68, 0x68},
> + {0x6b, 0x00},
> + {0x6c, 0x00},
> + {0x6f, 0x40},
> + {0x70, 0x40},
> + {0x71, 0x0a},
> + {0x72, 0xf0},
> + {0x73, 0x10},
> + {0x75, 0x80},
> + {0x76, 0x10},
> + {0x84, 0x00},
> + {0x85, 0x10},
> + {0x86, 0x10},
> + {0x87, 0x00},
> + {0x8a, 0x22},
> + {0x8b, 0x22},
> + {0x19, 0xf1},
> + {0x29, 0x01},
> + {0xfd, 0x01},
> + {0x9d, 0x16},
> + {0xa0, 0x29},
> + {0xa1, 0x04},
> + {0xad, 0x62},
> + {0xae, 0x00},
> + {0xaf, 0x85},
> + {0xb1, 0x01},
> + {0x8e, 0x06},
> + {0x8f, 0x40},
> + {0x90, 0x04},
> + {0x91, 0xb0},
> + {0x45, 0x01},
> + {0x46, 0x00},
> + {0x47, 0x6c},
> + {0x48, 0x03},
> + {0x49, 0x8b},
> + {0x4a, 0x00},
> + {0x4b, 0x07},
> + {0x4c, 0x04},
> + {0x4d, 0xb7},
> + {0xf0, 0x40},
> + {0xf1, 0x40},
> + {0xf2, 0x40},
> + {0xf3, 0x40},
> + {0x3f, 0x00},
> + {0xfd, 0x01},
> + {0x05, 0x00},
> + {0x06, 0xa6},
> + {0xfd, 0x01},
> +};
> +
> +static const char * const ov02a10_test_pattern_menu[] = {
> + "Disabled",
> + "Eight Vertical Colour Bars",
> +};
> +
> +static const s64 link_freq_menu_items[] = {
> + OV02A10_LINK_FREQ_390MHZ,
> +};
> +
> +static u64 to_pixel_rate(u32 f_index)
> +{
> + u64 pixel_rate = link_freq_menu_items[f_index] * 2 * OV02A10_DATA_LANES;
> +
> + do_div(pixel_rate, OV02A10_BITS_PER_SAMPLE);
> +
> + return pixel_rate;
> +}
> +
> +static const struct ov02a10_mode supported_modes[] = {
> + {
> + .width = 1600,
> + .height = 1200,
> + .exp_def = 0x01ae,
> + .hts_def = 0x03a6,
> + .vts_def = 0x056e,
> + .reg_list = {
> + .num_of_regs = ARRAY_SIZE(ov02a10_1600x1200_regs),
> + .regs = ov02a10_1600x1200_regs,
> + },
> + },
> +};
> +
> +static int ov02a10_write_array(struct ov02a10 *ov02a10,
> + const struct ov02a10_reg_list *r_list)
> +{
> + struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev);
> + unsigned int i;
> + int ret;
> +
> + for (i = 0; i < r_list->num_of_regs; i++) {
> + ret = i2c_smbus_write_byte_data(client, r_list->regs[i].addr,
> + r_list->regs[i].val);
> + if (ret < 0)
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +static int ov02a10_read_smbus(struct ov02a10 *ov02a10, unsigned char reg,
> + unsigned char *val)
> +{
> + struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev);
> + int ret;
> +
> + ret = i2c_smbus_read_byte_data(client, reg);
> + if (ret < 0)
> + return ret;
> +
> + *val = (unsigned char)ret;
No sure why you have casting and why returned value is not u8.
> + return 0;
> +}
> +
> +static void ov02a10_fill_fmt(const struct ov02a10_mode *mode,
> + struct v4l2_mbus_framefmt *fmt)
> +{
> + fmt->width = mode->width;
> + fmt->height = mode->height;
> + fmt->field = V4L2_FIELD_NONE;
> +}
> +
> +static int ov02a10_set_fmt(struct v4l2_subdev *sd,
> + struct v4l2_subdev_pad_config *cfg,
> + struct v4l2_subdev_format *fmt)
> +{
> + struct ov02a10 *ov02a10 = to_ov02a10(sd);
> + struct v4l2_mbus_framefmt *mbus_fmt = &fmt->format;
> + struct v4l2_mbus_framefmt *frame_fmt;
> + int ret = 0;
> +
> + mutex_lock(&ov02a10->mutex);
> +
> + if (ov02a10->streaming && fmt->which == V4L2_SUBDEV_FORMAT_ACTIVE) {
> + ret = -EBUSY;
> + goto error;
> + }
> +
> + /* Only one sensor mode supported */
> + mbus_fmt->code = ov02a10->fmt.code;
> + ov02a10_fill_fmt(ov02a10->cur_mode, mbus_fmt);
> +
> + if (fmt->which == V4L2_SUBDEV_FORMAT_TRY)
> + frame_fmt = v4l2_subdev_get_try_format(sd, cfg, 0);
> + else
> + frame_fmt = &ov02a10->fmt;
> +
> + *frame_fmt = *mbus_fmt;
> +
> +error:
Like in other places be more precise
out_unlock:
> + mutex_unlock(&ov02a10->mutex);
> + return ret;
> +}
> +
> +static int ov02a10_get_fmt(struct v4l2_subdev *sd,
> + struct v4l2_subdev_pad_config *cfg,
> + struct v4l2_subdev_format *fmt)
> +{
> + struct ov02a10 *ov02a10 = to_ov02a10(sd);
> + struct v4l2_mbus_framefmt *mbus_fmt = &fmt->format;
> +
> + mutex_lock(&ov02a10->mutex);
> +
> + if (fmt->which == V4L2_SUBDEV_FORMAT_TRY) {
> + fmt->format = *v4l2_subdev_get_try_format(sd, cfg, fmt->pad);
> + } else {
> + fmt->format = ov02a10->fmt;
> + mbus_fmt->code = ov02a10->fmt.code;
> + ov02a10_fill_fmt(ov02a10->cur_mode, mbus_fmt);
> + }
> +
> + mutex_unlock(&ov02a10->mutex);
> +
> + return 0;
> +}
> +
> +static int ov02a10_enum_mbus_code(struct v4l2_subdev *sd,
> + struct v4l2_subdev_pad_config *cfg,
> + struct v4l2_subdev_mbus_code_enum *code)
> +{
> + struct ov02a10 *ov02a10 = to_ov02a10(sd);
> +
> + if (code->index != 0)
> + return -EINVAL;
> +
> + code->code = ov02a10->fmt.code;
> +
> + return 0;
> +}
> +
> +static int ov02a10_enum_frame_sizes(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;
> +
> + fse->min_width = supported_modes[fse->index].width;
> + fse->max_width = supported_modes[fse->index].width;
> + fse->max_height = supported_modes[fse->index].height;
> + fse->min_height = supported_modes[fse->index].height;
> +
> + return 0;
> +}
> +
> +static int ov02a10_check_sensor_id(struct ov02a10 *ov02a10)
> +{
> + struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev);
> + u16 id;
> + u8 chip_id_h;
> + u8 chip_id_l;
> + int ret;
> +
> + /* Check sensor revision */
> + ret = ov02a10_read_smbus(ov02a10, OV02A10_REG_CHIP_ID_H, &chip_id_h);
> + if (ret)
> + return ret;
> +
> + ret = ov02a10_read_smbus(ov02a10, OV02A10_REG_CHIP_ID_L, &chip_id_l);
> + if (ret)
> + return ret;
I'm wondering if above can be done in one bulk transfer (reading 16-bit value).
> + id = (chip_id_h << 8) | chip_id_l;
If above can be achieved, this one should be rather something like
le16_to_cpu() (or be16) with corresponding type of chip_id.
> + if (id != CHIP_ID) {
> + dev_err(&client->dev, "Unexpected sensor id(%04x)\n", id);
> + return -EINVAL;
> + }
> +
> + return 0;
> +}
> +
> +static int ov02a10_power_on(struct device *dev)
> +{
> + struct i2c_client *client = to_i2c_client(dev);
> + struct v4l2_subdev *sd = i2c_get_clientdata(client);
struct v4l2_subdev *sd = dev_get_drvdata(dev);
Same for the rest similar cases.
> + struct ov02a10 *ov02a10 = to_ov02a10(sd);
> + int ret;
> +
> + gpiod_set_value_cansleep(ov02a10->rst_gpio, 1);
> + gpiod_set_value_cansleep(ov02a10->pd_gpio, 1);
> +
> + ret = clk_prepare_enable(ov02a10->eclk);
> + if (ret < 0) {
> + dev_err(dev, "failed to enable eclk\n");
> + return ret;
> + }
> +
> + ret = regulator_bulk_enable(ARRAY_SIZE(ov02a10_supply_names),
> + ov02a10->supplies);
> + if (ret < 0) {
> + dev_err(dev, "failed to enable regulators\n");
> + goto disable_clk;
> + }
> + usleep_range(5000, 6000);
> +
> + gpiod_set_value_cansleep(ov02a10->pd_gpio, 0);
> + usleep_range(5000, 6000);
> +
> + gpiod_set_value_cansleep(ov02a10->rst_gpio, 0);
> + usleep_range(5000, 6000);
> +
> + ret = ov02a10_check_sensor_id(ov02a10);
> + if (ret)
> + goto disable_regulator;
> +
> + return 0;
> +
> +disable_regulator:
> + regulator_bulk_disable(ARRAY_SIZE(ov02a10_supply_names),
> + ov02a10->supplies);
> +disable_clk:
> + clk_disable_unprepare(ov02a10->eclk);
> +
> + return ret;
> +}
> +
> +static int ov02a10_power_off(struct device *dev)
> +{
> + struct i2c_client *client = to_i2c_client(dev);
> + struct v4l2_subdev *sd = i2c_get_clientdata(client);
> + struct ov02a10 *ov02a10 = to_ov02a10(sd);
> +
> + gpiod_set_value_cansleep(ov02a10->rst_gpio, 1);
> + clk_disable_unprepare(ov02a10->eclk);
> + gpiod_set_value_cansleep(ov02a10->pd_gpio, 1);
> + regulator_bulk_disable(ARRAY_SIZE(ov02a10_supply_names),
> + ov02a10->supplies);
> +
> + return 0;
> +}
> +
> +static int __ov02a10_start_stream(struct ov02a10 *ov02a10)
> +{
> + struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev);
> + const struct ov02a10_reg_list *reg_list;
> + int ret;
> +
> + /* Apply default values of current mode */
> + reg_list = &ov02a10->cur_mode->reg_list;
> + ret = ov02a10_write_array(ov02a10, reg_list);
> + if (ret)
> + return ret;
> +
> + /* Apply customized values from user */
> + ret = __v4l2_ctrl_handler_setup(ov02a10->subdev.ctrl_handler);
> + if (ret)
> + return ret;
> +
> + /* Set orientation to 180 degree */
> + if (ov02a10->upside_down) {
> + ret = i2c_smbus_write_byte_data(client, REG_MIRROR_FLIP_CONTROL,
> + REG_MIRROR_FLIP_ENABLE);
> + if (ret) {
> + dev_err(&client->dev, "failed to set orientation\n");
> + return ret;
> + }
> + ret = i2c_smbus_write_byte_data(client, REG_GLOBAL_EFFECTIVE,
> + REG_ENABLE);
> + if (ret < 0)
> + return ret;
> + }
> +
> + /* Set MIPI TX speed according to DT property */
> + if (ov02a10->mipi_clock_voltage != OV02A10_MIPI_TX_SPEED_DEFAULT) {
> + ret = i2c_smbus_write_byte_data(client, TX_SPEED_AREA_SEL,
> + ov02a10->mipi_clock_voltage);
> + if (ret < 0)
> + return ret;
> + }
> +
> + /* Set stream on register */
> + return i2c_smbus_write_byte_data(client, REG_SC_CTRL_MODE,
> + SC_CTRL_MODE_STREAMING);
> +}
> +
> +static int __ov02a10_stop_stream(struct ov02a10 *ov02a10)
> +{
> + struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev);
> +
> + return i2c_smbus_write_byte_data(client, REG_SC_CTRL_MODE,
> + SC_CTRL_MODE_STANDBY);
> +}
> +
> +static int ov02a10_entity_init_cfg(struct v4l2_subdev *sd,
> + struct v4l2_subdev_pad_config *cfg)
> +{
> + struct v4l2_subdev_format fmt = {
> + .which = V4L2_SUBDEV_FORMAT_TRY,
> + .format = {
> + .width = 1600,
> + .height = 1200,
> + }
> + };
> +
> + ov02a10_set_fmt(sd, cfg, &fmt);
> +
> + return 0;
> +}
> +
> +static int ov02a10_s_stream(struct v4l2_subdev *sd, int on)
> +{
> + struct ov02a10 *ov02a10 = to_ov02a10(sd);
> + struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev);
> + int ret;
> +
> + mutex_lock(&ov02a10->mutex);
> +
> + if (ov02a10->streaming == on)
> + goto unlock_and_return;
> +
> + if (on) {
> + ret = pm_runtime_get_sync(&client->dev);
> + if (ret < 0) {
> + pm_runtime_put_noidle(&client->dev);
> + goto unlock_and_return;
> + }
> +
> + ret = __ov02a10_start_stream(ov02a10);
> + if (ret) {
> + __ov02a10_stop_stream(ov02a10);
> + ov02a10->streaming = !on;
> + goto err_rpm_put;
> + }
> + } else {
> + __ov02a10_stop_stream(ov02a10);
> + pm_runtime_put(&client->dev);
> + }
> +
> + ov02a10->streaming = on;
> + mutex_unlock(&ov02a10->mutex);
> +
> + return 0;
> +
> +err_rpm_put:
> + pm_runtime_put(&client->dev);
> +unlock_and_return:
> + mutex_unlock(&ov02a10->mutex);
> +
> + return ret;
> +}
> +
> +static const struct dev_pm_ops ov02a10_pm_ops = {
> + SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
> + pm_runtime_force_resume)
> + SET_RUNTIME_PM_OPS(ov02a10_power_off, ov02a10_power_on, NULL)
> +};
> +
> +/*
> + * ov02a10_set_exposure - Function called when setting exposure time
> + * @priv: Pointer to device structure
> + * @val: Variable for exposure time, in the unit of micro-second
> + *
> + * Set exposure time based on input value.
> + *
> + * Return: 0 on success
> + */
> +static int ov02a10_set_exposure(struct ov02a10 *ov02a10, int val)
> +{
> + struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev);
> + int ret;
> +
> + ret = i2c_smbus_write_byte_data(client, REG_PAGE_SWITCH, REG_ENABLE);
> + if (ret < 0)
> + return ret;
> +
> + ret = i2c_smbus_write_byte_data(client, OV02A10_REG_EXPOSURE_H,
> + val >> OV02A10_EXP_SHIFT);
> + if (ret < 0)
> + return ret;
> +
> + ret = i2c_smbus_write_byte_data(client, OV02A10_REG_EXPOSURE_L, val);
> + if (ret < 0)
> + return ret;
> +
> + return i2c_smbus_write_byte_data(client, REG_GLOBAL_EFFECTIVE,
> + REG_ENABLE);
> +}
> +
> +static int ov02a10_set_gain(struct ov02a10 *ov02a10, int val)
> +{
> + struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev);
> + int ret;
> +
> + ret = i2c_smbus_write_byte_data(client, REG_PAGE_SWITCH, REG_ENABLE);
> + if (ret < 0)
> + return ret;
> +
> + ret = i2c_smbus_write_byte_data(client, OV02A10_REG_GAIN, val);
> + if (ret < 0)
> + return ret;
> +
> + return i2c_smbus_write_byte_data(client, REG_GLOBAL_EFFECTIVE,
> + REG_ENABLE);
> +}
> +
> +static int ov02a10_set_vblank(struct ov02a10 *ov02a10, int val)
> +{
> + struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev);
> + u32 vts = val + ov02a10->cur_mode->height - OV02A10_BASIC_LINE;
> + int ret;
> +
> + ret = i2c_smbus_write_byte_data(client, REG_PAGE_SWITCH, REG_ENABLE);
> + if (ret < 0)
> + return ret;
> +
> + ret = i2c_smbus_write_byte_data(client, OV02A10_REG_VTS_H,
> + vts >> OV02A10_VTS_SHIFT);
> + if (ret < 0)
> + return ret;
> +
> + ret = i2c_smbus_write_byte_data(client, OV02A10_REG_VTS_L, vts);
> + if (ret < 0)
> + return ret;
> +
> + return i2c_smbus_write_byte_data(client, REG_GLOBAL_EFFECTIVE,
> + REG_ENABLE);
> +}
> +
> +static int ov02a10_set_test_pattern(struct ov02a10 *ov02a10, int pattern)
> +{
> + struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev);
> + int ret;
> +
> + ret = i2c_smbus_write_byte_data(client, REG_PAGE_SWITCH, REG_ENABLE);
> + if (ret < 0)
> + return ret;
> +
> + ret = i2c_smbus_write_byte_data(client, OV02A10_REG_TEST_PATTERN,
> + pattern);
> + if (ret < 0)
> + return ret;
> +
> + ret = i2c_smbus_write_byte_data(client, REG_GLOBAL_EFFECTIVE,
> + REG_ENABLE);
> + if (ret < 0)
> + return ret;
> +
> + return i2c_smbus_write_byte_data(client, REG_SC_CTRL_MODE,
> + SC_CTRL_MODE_STREAMING);
> +}
> +
> +static int ov02a10_set_ctrl(struct v4l2_ctrl *ctrl)
> +{
> + struct ov02a10 *ov02a10 = container_of(ctrl->handler,
> + struct ov02a10, ctrl_handler);
> + struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev);
> + s64 max_expo;
> + int ret;
> +
> + /* Propagate change of current control to all related controls */
> + if (ctrl->id == V4L2_CID_VBLANK) {
> + /* Update max exposure while meeting expected vblanking */
> + max_expo = ov02a10->cur_mode->height + ctrl->val -
> + OV02A10_EXPOSURE_MAX_MARGIN;
> + __v4l2_ctrl_modify_range(ov02a10->exposure,
> + ov02a10->exposure->minimum, max_expo,
> + ov02a10->exposure->step,
> + ov02a10->exposure->default_value);
> + }
> +
> + /* 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_EXPOSURE:
> + ret = ov02a10_set_exposure(ov02a10, ctrl->val);
> + break;
> + case V4L2_CID_ANALOGUE_GAIN:
> + ret = ov02a10_set_gain(ov02a10, ctrl->val);
> + break;
> + case V4L2_CID_VBLANK:
> + ret = ov02a10_set_vblank(ov02a10, ctrl->val);
> + break;
> + case V4L2_CID_TEST_PATTERN:
> + ret = ov02a10_set_test_pattern(ov02a10, ctrl->val);
> + break;
> + default:
> + ret = -EINVAL;
> + break;
> + };
> +
> + pm_runtime_put(&client->dev);
> +
> + return ret;
> +}
> +
> +static const struct v4l2_subdev_video_ops ov02a10_video_ops = {
> + .s_stream = ov02a10_s_stream,
> +};
> +
> +static const struct v4l2_subdev_pad_ops ov02a10_pad_ops = {
> + .init_cfg = ov02a10_entity_init_cfg,
> + .enum_mbus_code = ov02a10_enum_mbus_code,
> + .enum_frame_size = ov02a10_enum_frame_sizes,
> + .get_fmt = ov02a10_get_fmt,
> + .set_fmt = ov02a10_set_fmt,
> +};
> +
> +static const struct v4l2_subdev_ops ov02a10_subdev_ops = {
> + .video = &ov02a10_video_ops,
> + .pad = &ov02a10_pad_ops,
> +};
> +
> +static const struct media_entity_operations ov02a10_subdev_entity_ops = {
> + .link_validate = v4l2_subdev_link_validate,
> +};
> +
> +static const struct v4l2_ctrl_ops ov02a10_ctrl_ops = {
> + .s_ctrl = ov02a10_set_ctrl,
> +};
> +
> +static int ov02a10_initialize_controls(struct ov02a10 *ov02a10)
> +{
> + struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev);
> + const struct ov02a10_mode *mode;
> + struct v4l2_ctrl_handler *handler;
> + struct v4l2_ctrl *ctrl;
> + s64 exposure_max;
> + s64 vblank_def;
> + s64 pixel_rate;
> + s64 h_blank;
> + int ret;
> +
> + handler = &ov02a10->ctrl_handler;
> + mode = ov02a10->cur_mode;
> + ret = v4l2_ctrl_handler_init(handler, 7);
> + if (ret)
> + return ret;
> +
> + handler->lock = &ov02a10->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 = to_pixel_rate(0);
> + v4l2_ctrl_new_std(handler, NULL, V4L2_CID_PIXEL_RATE, 0, pixel_rate, 1,
> + pixel_rate);
> +
> + h_blank = mode->hts_def - mode->width;
> + v4l2_ctrl_new_std(handler, NULL, V4L2_CID_HBLANK, h_blank, h_blank, 1,
> + h_blank);
> +
> + vblank_def = mode->vts_def - mode->height;
> + v4l2_ctrl_new_std(handler, &ov02a10_ctrl_ops, V4L2_CID_VBLANK,
> + vblank_def, OV02A10_VTS_MAX - mode->height, 1,
> + vblank_def);
> +
> + exposure_max = mode->vts_def - 4;
> + ov02a10->exposure = v4l2_ctrl_new_std(handler, &ov02a10_ctrl_ops,
> + V4L2_CID_EXPOSURE,
> + OV02A10_EXPOSURE_MIN,
> + exposure_max,
> + OV02A10_EXPOSURE_STEP,
> + mode->exp_def);
> +
> + v4l2_ctrl_new_std(handler, &ov02a10_ctrl_ops,
> + V4L2_CID_ANALOGUE_GAIN, OV02A10_GAIN_MIN,
> + OV02A10_GAIN_MAX, OV02A10_GAIN_STEP,
> + OV02A10_GAIN_DEFAULT);
> +
> + v4l2_ctrl_new_std_menu_items(handler, &ov02a10_ctrl_ops,
> + V4L2_CID_TEST_PATTERN,
> + ARRAY_SIZE(ov02a10_test_pattern_menu) - 1,
> + 0, 0, ov02a10_test_pattern_menu);
> +
> + if (handler->error) {
> + ret = handler->error;
> + dev_err(&client->dev, "failed to init controls(%d)\n", ret);
> + goto err_free_handler;
> + }
> +
> + ov02a10->subdev.ctrl_handler = handler;
> +
> + return 0;
> +
> +err_free_handler:
> + v4l2_ctrl_handler_free(handler);
> +
> + return ret;
> +}
> +
> +static int ov02a10_check_hwcfg(struct device *dev, struct ov02a10 *ov02a10)
> +{
> + struct fwnode_handle *ep;
> + struct fwnode_handle *fwnode = dev_fwnode(dev);
> + struct v4l2_fwnode_endpoint bus_cfg = {
> + .bus_type = V4L2_MBUS_CSI2_DPHY,
> + };
> + unsigned int i, j;
> + int ret;
> +
> + if (!fwnode)
> + 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.nr_of_link_frequencies) {
> + dev_err(dev, "no link frequencies defined\n");
> + ret = -EINVAL;
> + goto check_hwcfg_error;
> + }
If it's 0, the below will break on 'if (j == 0)' with slightly different but
informative enough message. What do you keep above check for?
> + 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]) {
> + ov02a10->freq_index = i;
> + break;
> + }
> + }
> +
> + if (j == bus_cfg.nr_of_link_frequencies) {
> + dev_err(dev, "no link frequency %lld supported\n",
> + link_freq_menu_items[i]);
> + ret = -EINVAL;
> + goto check_hwcfg_error;
'break;' won't work?
> + }
> + }
> +
> +check_hwcfg_error:
out_endpoint_free:
> + v4l2_fwnode_endpoint_free(&bus_cfg);
> +
> + return ret;
> +}
> +
> +static int ov02a10_probe(struct i2c_client *client)
> +{
> + struct device *dev = &client->dev;
> + struct ov02a10 *ov02a10;
> + unsigned int rotation;
> + unsigned int cnt = 0;
> + unsigned int i;
> + unsigned int num_freq_clk_volt = 2 * ARRAY_SIZE(link_freq_menu_items);
Can it be moved upper to improve readability?
> + int ret;
> +
> + ov02a10 = devm_kzalloc(dev, sizeof(*ov02a10), GFP_KERNEL);
> + if (!ov02a10)
> + return -ENOMEM;
> +
> + ret = ov02a10_check_hwcfg(dev, ov02a10);
> + if (ret) {
> + dev_err(dev, "failed to check HW configuration: %d\n", ret);
> + return ret;
> + }
> +
> + v4l2_i2c_subdev_init(&ov02a10->subdev, client, &ov02a10_subdev_ops);
> + ov02a10->mipi_clock_voltage = OV02A10_MIPI_TX_SPEED_DEFAULT;
> + ov02a10->fmt.code = MEDIA_BUS_FMT_SBGGR10_1X10;
> +
> + /* Optional indication of physical rotation of sensor */
> + ret = fwnode_property_read_u32(dev_fwnode(dev), "rotation", &rotation);
> + if (!ret && rotation == 180) {
Can be simplified (but I'm fine with above):
unsigned int rotation = 0;
...
fwnode_property_read_u32(..., &rotation);
if (rotation == 180) {
...
}
> + ov02a10->upside_down = true;
> + ov02a10->fmt.code = MEDIA_BUS_FMT_SRGGB10_1X10;
> + }
> +
> + /* Optional indication of MIPI clock voltage unit */
> + ret = fwnode_property_read_u32_array(dev_fwnode(dev),
> + "ovti,mipi-clock-voltage", NULL,
> + 0);
ret = fwnode_property_count_u32(...); // will be one line
> + if (ret > 0 && ret % 2 == 0) {
> + u32 freq_clk_volt[ret];
> +
> + fwnode_property_read_u32_array(dev_fwnode(dev),
> + "ovti,mipi-clock-voltage",
> + freq_clk_volt,
> + ARRAY_SIZE(freq_clk_volt));
> +
> + while (num_freq_clk_volt) {
> + unsigned long freq;
> + unsigned long volt;
> +
> + if (cnt >= ARRAY_SIZE(freq_clk_volt)) {
> + dev_warn(dev, "mismatched link frequency\n");
> + break;
> + }
> +
> + freq = freq_clk_volt[cnt++] * 1000;
HZ_PER_KHZ?
> + volt = freq_clk_volt[cnt++];
> +
> + /* Get clock voltage unit value from DT */
> + if (freq == link_freq_menu_items[ov02a10->freq_index]) {
> + ov02a10->mipi_clock_voltage = volt;
> + break;
> + }
> +
> + num_freq_clk_volt -= 2;
> + }
> + }
> +
> + /* Get external input clock (eclk) */
> + ov02a10->eclk = devm_clk_get(dev, "eclk");
> + if (IS_ERR(ov02a10->eclk)) {
> + ret = PTR_ERR(ov02a10->eclk);
> + dev_err(dev, "failed to get eclk %d\n", ret);
> + return ret;
return dev_err_probe(...);
> + }
> +
> + ret = fwnode_property_read_u32(dev_fwnode(dev), "clock-frequency",
> + &ov02a10->eclk_freq);
> + if (ret) {
> + dev_err(dev, "failed to get eclk frequency\n");
> + return ret;
> + }
> + ret = clk_set_rate(ov02a10->eclk, ov02a10->eclk_freq);
> + if (ret) {
> + dev_err(dev, "failed to set eclk frequency (24MHz)\n");
> + return ret;
> + }
> +
> + if (clk_get_rate(ov02a10->eclk) != OV02A10_ECLK_FREQ) {
> + dev_warn(dev, "eclk mismatched, mode is based on 24MHz\n");
> + return -EINVAL;
> + }
> +
> + ov02a10->pd_gpio = devm_gpiod_get(dev, "powerdown", GPIOD_OUT_HIGH);
> + if (IS_ERR(ov02a10->pd_gpio)) {
> + ret = PTR_ERR(ov02a10->pd_gpio);
> + dev_err(dev, "failed to get powerdown-gpios %d\n", ret);
> + return ret;
return dev_err_probe(...);
> + }
> +
> + ov02a10->rst_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
> + if (IS_ERR(ov02a10->rst_gpio)) {
> + ret = PTR_ERR(ov02a10->rst_gpio);
> + dev_err(dev, "failed to get reset-gpios %d\n", ret);
> + return ret;
Ditto.
> + }
> +
> + for (i = 0; i < ARRAY_SIZE(ov02a10_supply_names); i++)
> + ov02a10->supplies[i].supply = ov02a10_supply_names[i];
> +
> + ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ov02a10_supply_names),
> + ov02a10->supplies);
> + if (ret) {
> + dev_err(dev, "failed to get regulators\n");
> + return ret;
Ditto.
> + }
> +
> + mutex_init(&ov02a10->mutex);
> + ov02a10->cur_mode = &supported_modes[0];
> +
> + ret = ov02a10_initialize_controls(ov02a10);
> + if (ret) {
> + dev_err(dev, "failed to initialize controls\n");
> + goto err_destroy_mutex;
> + }
> +
> + ov02a10->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
> + ov02a10->subdev.entity.ops = &ov02a10_subdev_entity_ops;
> + ov02a10->subdev.entity.function = MEDIA_ENT_F_CAM_SENSOR;
> + ov02a10->pad.flags = MEDIA_PAD_FL_SOURCE;
> +
> + ret = media_entity_pads_init(&ov02a10->subdev.entity, 1, &ov02a10->pad);
> + if (ret < 0) {
> + dev_err(dev, "failed to init entity pads: %d", ret);
> + goto err_free_handler;
> + }
> +
> + pm_runtime_enable(dev);
> + if (!pm_runtime_enabled(dev)) {
> + ret = ov02a10_power_on(dev);
> + if (ret < 0) {
> + dev_err(dev, "failed to power on: %d\n", ret);
> + goto err_clean_entity;
> + }
> + }
> +
> + ret = v4l2_async_register_subdev(&ov02a10->subdev);
> + if (ret) {
> + dev_err(dev, "failed to register V4L2 subdev: %d\n", ret);
> + goto err_power_off;
> + }
> +
> + return 0;
> +
> +err_power_off:
> + if (pm_runtime_enabled(dev))
> + pm_runtime_disable(dev);
> + else
> + ov02a10_power_off(dev);
> +err_clean_entity:
> + media_entity_cleanup(&ov02a10->subdev.entity);
> +err_free_handler:
> + v4l2_ctrl_handler_free(ov02a10->subdev.ctrl_handler);
> +err_destroy_mutex:
> + mutex_destroy(&ov02a10->mutex);
> +
> + return ret;
> +}
> +
> +static int ov02a10_remove(struct i2c_client *client)
> +{
> + struct v4l2_subdev *sd = i2c_get_clientdata(client);
> + struct ov02a10 *ov02a10 = to_ov02a10(sd);
> +
> + v4l2_async_unregister_subdev(sd);
> + media_entity_cleanup(&sd->entity);
> + v4l2_ctrl_handler_free(sd->ctrl_handler);
> + pm_runtime_disable(&client->dev);
> + if (!pm_runtime_status_suspended(&client->dev))
> + ov02a10_power_off(&client->dev);
> + pm_runtime_set_suspended(&client->dev);
> + mutex_destroy(&ov02a10->mutex);
> +
> + return 0;
> +}
> +
> +static const struct of_device_id ov02a10_of_match[] = {
> + { .compatible = "ovti,ov02a10" },
> + {}
> +};
> +MODULE_DEVICE_TABLE(of, ov02a10_of_match);
> +
> +static struct i2c_driver ov02a10_i2c_driver = {
> + .driver = {
> + .name = "ov02a10",
> + .pm = &ov02a10_pm_ops,
> + .of_match_table = ov02a10_of_match,
> + },
> + .probe_new = &ov02a10_probe,
> + .remove = &ov02a10_remove,
> +};
> +
Redundant blank line.
> +module_i2c_driver(ov02a10_i2c_driver);
> +
> +MODULE_AUTHOR("Dongchun Zhu <dongchun.zhu at mediatek.com>");
> +MODULE_DESCRIPTION("OmniVision OV02A10 sensor driver");
> +MODULE_LICENSE("GPL v2");
> --
> 2.9.2
--
With Best Regards,
Andy Shevchenko
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