Re: [PATCH v4 2/2] media: i2c: add support for OV4689

From: Jacopo Mondi
Date: Tue Oct 25 2022 - 09:10:19 EST

Hi Mikhail,

On Sat, Oct 22, 2022 at 07:20:07PM +0300, Mikhail Rudenko wrote:
> Add a V4L2 sub-device driver for OmniVision OV4689 image sensor. This
> is a 4 Mpx image sensor using the I2C bus for control and the CSI-2
> bus for data.
>
> This driver supports following features:
> - manual exposure and analog gain control support
> - test pattern support
> - media controller support
> - runtime PM support
> - support following resolutions:
> + 2688x1520 at 30 fps
>
> The driver provides all mandatory V4L2 controls for compatibility with
> libcamera. The sensor supports 1/2/4-lane CSI-2 modes, but the driver
> implements 4 lane mode only at this moment.
>
> Signed-off-by: Mikhail Rudenko <mike.rudenko@xxxxxxxxx>
> ---
> MAINTAINERS | 1 +
> drivers/media/i2c/Kconfig | 13 +
> drivers/media/i2c/Makefile | 1 +
> drivers/media/i2c/ov4689.c | 1026 ++++++++++++++++++++++++++++++++++++
> 4 files changed, 1041 insertions(+)
> create mode 100644 drivers/media/i2c/ov4689.c
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 4d6d86a9f704..acf38afb3e73 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -15210,6 +15210,7 @@ L: linux-media@xxxxxxxxxxxxxxx
> S: Maintained
> T: git git://linuxtv.org/media_tree.git
> F: Documentation/devicetree/bindings/media/i2c/ovti,ov4689.yaml
> +F: drivers/media/i2c/ov5647.c
>
> OMNIVISION OV5640 SENSOR DRIVER
> M: Steve Longerbeam <slongerbeam@xxxxxxxxx>
> diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
> index 7806d4b81716..1e1985252ec8 100644
> --- a/drivers/media/i2c/Kconfig
> +++ b/drivers/media/i2c/Kconfig
> @@ -445,6 +445,19 @@ config VIDEO_OV2740
> To compile this driver as a module, choose M here: the
> module will be called ov2740.
>
> +config VIDEO_OV4689
> + tristate "OmniVision OV4689 sensor support"
> + depends on GPIOLIB && VIDEO_DEV && I2C
> + select MEDIA_CONTROLLER
> + select VIDEO_V4L2_SUBDEV_API
> + select V4L2_FWNODE
> + help
> + This is a Video4Linux2 sensor-level driver for the OmniVision
> + OV4689 camera.
> +
> + To compile this driver as a module, choose M here: the
> + module will be called ov4689.
> +
> config VIDEO_OV5640
> tristate "OmniVision OV5640 sensor support"
> depends on OF
> diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile
> index 0a2933103dd9..c1a2cb351c0f 100644
> --- a/drivers/media/i2c/Makefile
> +++ b/drivers/media/i2c/Makefile
> @@ -79,6 +79,7 @@ obj-$(CONFIG_VIDEO_OV2659) += ov2659.o
> obj-$(CONFIG_VIDEO_OV2680) += ov2680.o
> obj-$(CONFIG_VIDEO_OV2685) += ov2685.o
> obj-$(CONFIG_VIDEO_OV2740) += ov2740.o
> +obj-$(CONFIG_VIDEO_OV4689) += ov4689.o
> obj-$(CONFIG_VIDEO_OV5640) += ov5640.o
> obj-$(CONFIG_VIDEO_OV5645) += ov5645.o
> obj-$(CONFIG_VIDEO_OV5647) += ov5647.o
> diff --git a/drivers/media/i2c/ov4689.c b/drivers/media/i2c/ov4689.c
> new file mode 100644
> index 000000000000..419ff7371ba8
> --- /dev/null
> +++ b/drivers/media/i2c/ov4689.c
> @@ -0,0 +1,1026 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * ov4689 driver
> + *
> + * Copyright (C) 2017 Fuzhou Rockchip Electronics Co., Ltd.
> + * Copyright (C) 2022 Mikhail Rudenko
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/delay.h>
> +#include <linux/gpio/consumer.h>
> +#include <linux/i2c.h>
> +#include <linux/module.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/regulator/consumer.h>
> +#include <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 0x004688
> +#define OV4689_REG_CHIP_ID 0x300a
> +
> +#define OV4689_XVCLK_FREQ 24000000
> +
> +#define OV4689_REG_CTRL_MODE 0x0100
> +#define OV4689_MODE_SW_STANDBY 0x0
> +#define OV4689_MODE_STREAMING BIT(0)
> +
> +#define OV4689_REG_EXPOSURE 0x3500
> +#define OV4689_EXPOSURE_MIN 4
> +#define OV4689_EXPOSURE_STEP 1
> +#define OV4689_VTS_MAX 0x7fff
> +
> +#define OV4689_REG_GAIN_H 0x3508
> +#define OV4689_REG_GAIN_L 0x3509
> +#define OV4689_GAIN_H_MASK 0x07
> +#define OV4689_GAIN_H_SHIFT 8
> +#define OV4689_GAIN_L_MASK 0xff
> +#define OV4689_GAIN_STEP 1
> +#define OV4689_GAIN_DEFAULT 0x80
> +
> +#define OV4689_REG_TEST_PATTERN 0x5040
> +#define OV4689_TEST_PATTERN_ENABLE 0x80
> +#define OV4689_TEST_PATTERN_DISABLE 0x0
> +
> +#define OV4689_REG_VTS 0x380e
> +
> +#define REG_NULL 0xFFFF
> +
> +#define OV4689_REG_VALUE_08BIT 1
> +#define OV4689_REG_VALUE_16BIT 2
> +#define OV4689_REG_VALUE_24BIT 3
> +
> +#define OV4689_LANES 4
> +
> +static const char *const ov4689_supply_names[] = {
> + "avdd", /* Analog power */
> + "dovdd", /* Digital I/O power */
> + "dvdd", /* Digital core power */
> +};
> +
> +struct regval {
> + u16 addr;
> + u8 val;
> +};
> +
> +enum ov4689_mode_id {
> + OV4689_MODE_2688_1520 = 0,
> + OV4689_NUM_MODES,
> +};
> +
> +struct ov4689_mode {
> + enum ov4689_mode_id id;
> + u32 width;
> + u32 height;
> + u32 max_fps;
> + u32 hts_def;
> + u32 vts_def;
> + u32 exp_def;
> + u32 pixel_rate;
> + u32 sensor_width;
> + u32 sensor_height;
> + u32 crop_top;
> + u32 crop_left;
> + const struct regval *reg_list;
> +};
> +
> +struct ov4689 {
> + struct i2c_client *client;
> + struct clk *xvclk;
> + struct gpio_desc *reset_gpio;
> + struct gpio_desc *pwdn_gpio;
> + struct regulator_bulk_data supplies[ARRAY_SIZE(ov4689_supply_names)];
> +
> + struct v4l2_subdev subdev;
> + struct media_pad pad;
> +
> + u32 clock_rate;
> +
> + struct mutex mutex; /* lock to protect streaming, ctrls and cur_mode */
> + bool streaming;
> + struct v4l2_ctrl_handler ctrl_handler;
> + struct v4l2_ctrl *exposure;
> +
> + const struct ov4689_mode *cur_mode;
> +};
> +
> +#define to_ov4689(sd) container_of(sd, struct ov4689, subdev)
> +
> +struct ov4689_gain_range {
> + u32 logical_min;
> + u32 logical_max;
> + u32 offset;
> + u32 divider;
> + u32 physical_min;
> + u32 physical_max;
> +};
> +
> +/*
> + * Xclk 24Mhz
> + * max_framerate 30fps
> + * mipi_datarate per lane 1008Mbps
> + */
> +static const struct regval ov4689_2688x1520_regs[] = {
> + {0x0103, 0x01}, {0x3638, 0x00}, {0x0300, 0x00},
> + {0x0302, 0x2a}, {0x0303, 0x00}, {0x0304, 0x03},
> + {0x030b, 0x00}, {0x030d, 0x1e}, {0x030e, 0x04},
> + {0x030f, 0x01}, {0x0312, 0x01}, {0x031e, 0x00},
> + {0x3000, 0x20}, {0x3002, 0x00}, {0x3018, 0x72},
> + {0x3020, 0x93}, {0x3021, 0x03}, {0x3022, 0x01},
> + {0x3031, 0x0a}, {0x303f, 0x0c}, {0x3305, 0xf1},
> + {0x3307, 0x04}, {0x3309, 0x29}, {0x3500, 0x00},
> + {0x3501, 0x60}, {0x3502, 0x00}, {0x3503, 0x04},
> + {0x3504, 0x00}, {0x3505, 0x00}, {0x3506, 0x00},
> + {0x3507, 0x00}, {0x3508, 0x00}, {0x3509, 0x80},
> + {0x350a, 0x00}, {0x350b, 0x00}, {0x350c, 0x00},
> + {0x350d, 0x00}, {0x350e, 0x00}, {0x350f, 0x80},
> + {0x3510, 0x00}, {0x3511, 0x00}, {0x3512, 0x00},
> + {0x3513, 0x00}, {0x3514, 0x00}, {0x3515, 0x80},
> + {0x3516, 0x00}, {0x3517, 0x00}, {0x3518, 0x00},
> + {0x3519, 0x00}, {0x351a, 0x00}, {0x351b, 0x80},
> + {0x351c, 0x00}, {0x351d, 0x00}, {0x351e, 0x00},
> + {0x351f, 0x00}, {0x3520, 0x00}, {0x3521, 0x80},
> + {0x3522, 0x08}, {0x3524, 0x08}, {0x3526, 0x08},
> + {0x3528, 0x08}, {0x352a, 0x08}, {0x3602, 0x00},
> + {0x3603, 0x40}, {0x3604, 0x02}, {0x3605, 0x00},
> + {0x3606, 0x00}, {0x3607, 0x00}, {0x3609, 0x12},
> + {0x360a, 0x40}, {0x360c, 0x08}, {0x360f, 0xe5},
> + {0x3608, 0x8f}, {0x3611, 0x00}, {0x3613, 0xf7},
> + {0x3616, 0x58}, {0x3619, 0x99}, {0x361b, 0x60},
> + {0x361c, 0x7a}, {0x361e, 0x79}, {0x361f, 0x02},
> + {0x3632, 0x00}, {0x3633, 0x10}, {0x3634, 0x10},
> + {0x3635, 0x10}, {0x3636, 0x15}, {0x3646, 0x86},
> + {0x364a, 0x0b}, {0x3700, 0x17}, {0x3701, 0x22},
> + {0x3703, 0x10}, {0x370a, 0x37}, {0x3705, 0x00},
> + {0x3706, 0x63}, {0x3709, 0x3c}, {0x370b, 0x01},
> + {0x370c, 0x30}, {0x3710, 0x24}, {0x3711, 0x0c},
> + {0x3716, 0x00}, {0x3720, 0x28}, {0x3729, 0x7b},
> + {0x372a, 0x84}, {0x372b, 0xbd}, {0x372c, 0xbc},
> + {0x372e, 0x52}, {0x373c, 0x0e}, {0x373e, 0x33},
> + {0x3743, 0x10}, {0x3744, 0x88}, {0x3745, 0xc0},
> + {0x374a, 0x43}, {0x374c, 0x00}, {0x374e, 0x23},
> + {0x3751, 0x7b}, {0x3752, 0x84}, {0x3753, 0xbd},
> + {0x3754, 0xbc}, {0x3756, 0x52}, {0x375c, 0x00},
> + {0x3760, 0x00}, {0x3761, 0x00}, {0x3762, 0x00},
> + {0x3763, 0x00}, {0x3764, 0x00}, {0x3767, 0x04},
> + {0x3768, 0x04}, {0x3769, 0x08}, {0x376a, 0x08},
> + {0x376b, 0x20}, {0x376c, 0x00}, {0x376d, 0x00},
> + {0x376e, 0x00}, {0x3773, 0x00}, {0x3774, 0x51},
> + {0x3776, 0xbd}, {0x3777, 0xbd}, {0x3781, 0x18},
> + {0x3783, 0x25}, {0x3798, 0x1b}, {0x3800, 0x00},
> + {0x3801, 0x08}, {0x3802, 0x00}, {0x3803, 0x04},
> + {0x3804, 0x0a}, {0x3805, 0x97}, {0x3806, 0x05},
> + {0x3807, 0xfb}, {0x3808, 0x0a}, {0x3809, 0x80},
> + {0x380a, 0x05}, {0x380b, 0xf0}, {0x380c, 0x0a},
> + {0x380d, 0x0e}, {0x380e, 0x06}, {0x380f, 0x12},
> + {0x3810, 0x00}, {0x3811, 0x08}, {0x3812, 0x00},
> + {0x3813, 0x04}, {0x3814, 0x01}, {0x3815, 0x01},
> + {0x3819, 0x01}, {0x3820, 0x00}, {0x3821, 0x06},
> + {0x3829, 0x00}, {0x382a, 0x01}, {0x382b, 0x01},
> + {0x382d, 0x7f}, {0x3830, 0x04}, {0x3836, 0x01},
> + {0x3837, 0x00}, {0x3841, 0x02}, {0x3846, 0x08},
> + {0x3847, 0x07}, {0x3d85, 0x36}, {0x3d8c, 0x71},
> + {0x3d8d, 0xcb}, {0x3f0a, 0x00}, {0x4000, 0xf1},
> + {0x4001, 0x40}, {0x4002, 0x04}, {0x4003, 0x14},
> + {0x400e, 0x00}, {0x4011, 0x00}, {0x401a, 0x00},
> + {0x401b, 0x00}, {0x401c, 0x00}, {0x401d, 0x00},
> + {0x401f, 0x00}, {0x4020, 0x00}, {0x4021, 0x10},
> + {0x4022, 0x07}, {0x4023, 0xcf}, {0x4024, 0x09},
> + {0x4025, 0x60}, {0x4026, 0x09}, {0x4027, 0x6f},
> + {0x4028, 0x00}, {0x4029, 0x02}, {0x402a, 0x06},
> + {0x402b, 0x04}, {0x402c, 0x02}, {0x402d, 0x02},
> + {0x402e, 0x0e}, {0x402f, 0x04}, {0x4302, 0xff},
> + {0x4303, 0xff}, {0x4304, 0x00}, {0x4305, 0x00},
> + {0x4306, 0x00}, {0x4308, 0x02}, {0x4500, 0x6c},
> + {0x4501, 0xc4}, {0x4502, 0x40}, {0x4503, 0x01},
> + {0x4601, 0xa7}, {0x4800, 0x04}, {0x4813, 0x08},
> + {0x481f, 0x40}, {0x4829, 0x78}, {0x4837, 0x10},
> + {0x4b00, 0x2a}, {0x4b0d, 0x00}, {0x4d00, 0x04},
> + {0x4d01, 0x42}, {0x4d02, 0xd1}, {0x4d03, 0x93},
> + {0x4d04, 0xf5}, {0x4d05, 0xc1}, {0x5000, 0xf3},
> + {0x5001, 0x11}, {0x5004, 0x00}, {0x500a, 0x00},
> + {0x500b, 0x00}, {0x5032, 0x00}, {0x5040, 0x00},
> + {0x5050, 0x0c}, {0x5500, 0x00}, {0x5501, 0x10},
> + {0x5502, 0x01}, {0x5503, 0x0f}, {0x8000, 0x00},
> + {0x8001, 0x00}, {0x8002, 0x00}, {0x8003, 0x00},
> + {0x8004, 0x00}, {0x8005, 0x00}, {0x8006, 0x00},
> + {0x8007, 0x00}, {0x8008, 0x00}, {0x3638, 0x00},
> + {REG_NULL, 0x00},
> +};
> +
> +static const struct ov4689_mode supported_modes[] = {
> + {
> + .id = OV4689_MODE_2688_1520,
> + .width = 2688,
> + .height = 1520,
> + .sensor_width = 2720,
> + .sensor_height = 1536,
> + .crop_top = 8,
> + .crop_left = 16,
> + .max_fps = 30,
> + .exp_def = 1536,
> + .hts_def = 4 * 2574,
> + .vts_def = 1554,
> + .pixel_rate = 480000000,
> + .reg_list = ov4689_2688x1520_regs,
> + },
> +};
> +
> +static const u64 link_freq_menu_items[] = { 504000000 };
> +
> +static const char *const ov4689_test_pattern_menu[] = {
> + "Disabled",
> + "Vertical Color Bar Type 1",
> + "Vertical Color Bar Type 2",
> + "Vertical Color Bar Type 3",
> + "Vertical Color Bar Type 4"
> +};
> +
> +/*
> + * These coefficients are based on those used in Rockchip's camera
> + * engine, with minor tweaks for continuity.
> + */
> +static const struct ov4689_gain_range ov4689_gain_ranges[] = {
> + {
> + .logical_min = 0,
> + .logical_max = 255,
> + .offset = 0,
> + .divider = 1,
> + .physical_min = 0,
> + .physical_max = 255,
> + },
> + {
> + .logical_min = 256,
> + .logical_max = 511,
> + .offset = 252,
> + .divider = 2,
> + .physical_min = 376,
> + .physical_max = 504,
> + },
> + {
> + .logical_min = 512,
> + .logical_max = 1023,
> + .offset = 758,
> + .divider = 4,
> + .physical_min = 884,
> + .physical_max = 1012,
> + },
> + {
> + .logical_min = 1024,
> + .logical_max = 2047,
> + .offset = 1788,
> + .divider = 8,
> + .physical_min = 1912,
> + .physical_max = 2047,
> + },
> +};
> +
> +/* Write registers up to 4 at a time */
> +static int ov4689_write_reg(struct i2c_client *client, u16 reg, u32 len,
> + u32 val)
> +{
> + u32 buf_i, val_i;
> + __be32 val_be;
> + u8 *val_p;
> + u8 buf[6];
> +
> + if (len > 4)
> + return -EINVAL;
> +
> + buf[0] = reg >> 8;
> + buf[1] = reg & 0xff;
> +
> + val_be = cpu_to_be32(val);
> + val_p = (u8 *)&val_be;
> + buf_i = 2;
> + val_i = 4 - len;
> +
> + while (val_i < 4)
> + buf[buf_i++] = val_p[val_i++];
> +
> + if (i2c_master_send(client, buf, len + 2) != len + 2)
> + return -EIO;
> +
> + return 0;
> +}
> +
> +static int ov4689_write_array(struct i2c_client *client,
> + const struct regval *regs)
> +{
> + int ret = 0;
> + u32 i;
> +
> + for (i = 0; ret == 0 && regs[i].addr != REG_NULL; i++)
> + ret = ov4689_write_reg(client, regs[i].addr,
> + OV4689_REG_VALUE_08BIT, regs[i].val);
> +
> + return ret;
> +}
> +
> +/* Read registers up to 4 at a time */
> +static int ov4689_read_reg(struct i2c_client *client, u16 reg, unsigned int len,
> + u32 *val)
> +{
> + __be16 reg_addr_be = cpu_to_be16(reg);
> + struct i2c_msg msgs[2];
> + __be32 data_be = 0;
> + u8 *data_be_p;
> + int ret;
> +
> + if (len > 4 || !len)
> + return -EINVAL;
> +
> + data_be_p = (u8 *)&data_be;
> + /* Write register address */
> + msgs[0].addr = client->addr;
> + msgs[0].flags = 0;
> + msgs[0].len = 2;
> + msgs[0].buf = (u8 *)&reg_addr_be;
> +
> + /* Read data from register */
> + msgs[1].addr = client->addr;
> + msgs[1].flags = I2C_M_RD;
> + msgs[1].len = len;
> + msgs[1].buf = &data_be_p[4 - len];
> +
> + ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
> + if (ret != ARRAY_SIZE(msgs))
> + return -EIO;
> +
> + *val = be32_to_cpu(data_be);
> +
> + return 0;
> +}
> +
> +static void ov4689_fill_fmt(const struct ov4689_mode *mode,
> + struct v4l2_mbus_framefmt *fmt)
> +{
> + fmt->code = MEDIA_BUS_FMT_SBGGR10_1X10;
> + fmt->width = mode->width;
> + fmt->height = mode->height;
> + fmt->field = V4L2_FIELD_NONE;
> +}
> +
> +static int ov4689_set_fmt(struct v4l2_subdev *sd,
> + struct v4l2_subdev_state *sd_state,
> + struct v4l2_subdev_format *fmt)
> +{
> + struct v4l2_mbus_framefmt *mbus_fmt = &fmt->format;
> + struct ov4689 *ov4689 = to_ov4689(sd);
> +
> + /* only one mode supported for now */
> + ov4689_fill_fmt(ov4689->cur_mode, mbus_fmt);
> +
> + return 0;
> +}
> +
> +static int ov4689_get_fmt(struct v4l2_subdev *sd,
> + struct v4l2_subdev_state *sd_state,
> + struct v4l2_subdev_format *fmt)
> +{
> + struct v4l2_mbus_framefmt *mbus_fmt = &fmt->format;
> + struct ov4689 *ov4689 = to_ov4689(sd);
> +
> + /* only one mode supported for now */
> + ov4689_fill_fmt(ov4689->cur_mode, mbus_fmt);
> +
> + return 0;
> +}
> +
> +static int ov4689_enum_mbus_code(struct v4l2_subdev *sd,
> + struct v4l2_subdev_state *sd_state,
> + struct v4l2_subdev_mbus_code_enum *code)
> +{
> + if (code->index != 0)
> + return -EINVAL;
> + code->code = MEDIA_BUS_FMT_SBGGR10_1X10;
> +
> + return 0;
> +}
> +
> +static int ov4689_enum_frame_sizes(struct v4l2_subdev *sd,
> + struct v4l2_subdev_state *sd_state,
> + struct v4l2_subdev_frame_size_enum *fse)
> +{
> + if (fse->index >= ARRAY_SIZE(supported_modes))
> + return -EINVAL;
> +
> + if (fse->code != MEDIA_BUS_FMT_SBGGR10_1X10)
> + 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 ov4689_enable_test_pattern(struct ov4689 *ov4689, u32 pattern)
> +{
> + u32 val;
> +
> + if (pattern)
> + val = (pattern - 1) | OV4689_TEST_PATTERN_ENABLE;
> + else
> + val = OV4689_TEST_PATTERN_DISABLE;
> +
> + return ov4689_write_reg(ov4689->client, OV4689_REG_TEST_PATTERN,
> + OV4689_REG_VALUE_08BIT, val);
> +}
> +
> +static int ov4689_get_selection(struct v4l2_subdev *sd,
> + struct v4l2_subdev_state *state,
> + struct v4l2_subdev_selection *sel)
> +{
> + const struct ov4689_mode *mode = to_ov4689(sd)->cur_mode;
> +
> + if (sel->which != V4L2_SUBDEV_FORMAT_ACTIVE)
> + return -EINVAL;
> +
> + switch (sel->target) {
> + case V4L2_SEL_TGT_CROP_BOUNDS:
> + sel->r.top = 0;
> + sel->r.left = 0;
> + sel->r.width = mode->sensor_width;
> + sel->r.height = mode->sensor_height;
> + return 0;
> + case V4L2_SEL_TGT_CROP:
> + case V4L2_SEL_TGT_CROP_DEFAULT:
> + sel->r.top = mode->crop_top;
> + sel->r.left = mode->crop_left;
> + sel->r.width = mode->width;
> + sel->r.height = mode->height;
> + return 0;
> + }
> +
> + return -EINVAL;
> +}
> +
> +static int ov4689_s_stream(struct v4l2_subdev *sd, int on)
> +{
> + struct ov4689 *ov4689 = to_ov4689(sd);
> + struct i2c_client *client = ov4689->client;
> + int ret = 0;
> +
> + mutex_lock(&ov4689->mutex);
> +
> + on = !!on;
> + if (on == ov4689->streaming)
> + goto unlock_and_return;
> +
> + if (on) {
> + ret = pm_runtime_resume_and_get(&client->dev);
> + if (ret < 0)
> + goto unlock_and_return;
> +
> + ret = ov4689_write_array(ov4689->client,
> + ov4689->cur_mode->reg_list);
> + if (ret) {
> + pm_runtime_put(&client->dev);
> + goto unlock_and_return;
> + }
> +
> + ret = __v4l2_ctrl_handler_setup(&ov4689->ctrl_handler);
> + if (ret) {
> + pm_runtime_put(&client->dev);
> + goto unlock_and_return;
> + }
> +
> + ret = ov4689_write_reg(ov4689->client, OV4689_REG_CTRL_MODE,
> + OV4689_REG_VALUE_08BIT,
> + OV4689_MODE_STREAMING);
> + if (ret) {
> + pm_runtime_put(&client->dev);
> + goto unlock_and_return;
> + }
> + } else {
> + ov4689_write_reg(ov4689->client, OV4689_REG_CTRL_MODE,
> + OV4689_REG_VALUE_08BIT,
> + OV4689_MODE_SW_STANDBY);
> + pm_runtime_put(&client->dev);
> + }
> +
> + ov4689->streaming = on;
> +
> +unlock_and_return:
> + mutex_unlock(&ov4689->mutex);
> +
> + return ret;
> +}
> +
> +/* Calculate the delay in us by clock rate and clock cycles */
> +static inline u32 ov4689_cal_delay(struct ov4689 *ov4689, u32 cycles)
> +{
> + return DIV_ROUND_UP(cycles * 1000,
> + DIV_ROUND_UP(ov4689->clock_rate, 1000));
> +}
> +
> +static int __maybe_unused ov4689_power_on(struct device *dev)
> +{
> + struct v4l2_subdev *sd = dev_get_drvdata(dev);
> + struct ov4689 *ov4689 = to_ov4689(sd);
> + u32 delay_us;
> + int ret;
> +
> + ret = clk_prepare_enable(ov4689->xvclk);
> + if (ret < 0) {
> + dev_err(dev, "Failed to enable xvclk\n");
> + return ret;
> + }
> +
> + gpiod_set_value_cansleep(ov4689->reset_gpio, 1);
> +
> + ret = regulator_bulk_enable(ARRAY_SIZE(ov4689_supply_names),
> + ov4689->supplies);
> + if (ret < 0) {
> + dev_err(dev, "Failed to enable regulators\n");
> + goto disable_clk;
> + }
> +
> + gpiod_set_value_cansleep(ov4689->reset_gpio, 0);
> + usleep_range(500, 1000);
> + gpiod_set_value_cansleep(ov4689->pwdn_gpio, 0);
> +
> + /* 8192 cycles prior to first SCCB transaction */
> + delay_us = ov4689_cal_delay(ov4689, 8192);
> + usleep_range(delay_us, delay_us * 2);
> +
> + return 0;
> +
> +disable_clk:
> + clk_disable_unprepare(ov4689->xvclk);
> +
> + return ret;
> +}
> +
> +static int __maybe_unused ov4689_power_off(struct device *dev)
> +{
> + struct v4l2_subdev *sd = dev_get_drvdata(dev);
> + struct ov4689 *ov4689 = to_ov4689(sd);
> +
> + gpiod_set_value_cansleep(ov4689->pwdn_gpio, 1);
> + clk_disable_unprepare(ov4689->xvclk);
> + gpiod_set_value_cansleep(ov4689->reset_gpio, 1);
> + regulator_bulk_disable(ARRAY_SIZE(ov4689_supply_names),
> + ov4689->supplies);
> + return 0;
> +}
> +
> +static int ov4689_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
> +{
> + struct ov4689 *ov4689 = to_ov4689(sd);
> + struct v4l2_mbus_framefmt *try_fmt;
> +
> + mutex_lock(&ov4689->mutex);
> +
> + try_fmt = v4l2_subdev_get_try_format(sd, fh->state, 0);
> + /* Initialize try_fmt */
> + ov4689_fill_fmt(&supported_modes[OV4689_MODE_2688_1520], try_fmt);
> +
> + mutex_unlock(&ov4689->mutex);
> +
> + return 0;
> +}

FYI the centralized state support has been recently introduced in v4l2.
It allows you (among other things) to replace open with init_cfg and
centralize the handling of formats initialization. This driver only
supports one format, so no big deal.

> +
> +static const struct dev_pm_ops ov4689_pm_ops = {
> + SET_RUNTIME_PM_OPS(ov4689_power_off, ov4689_power_on, NULL)
> +};
> +
> +static const struct v4l2_subdev_internal_ops ov4689_internal_ops = {
> + .open = ov4689_open,
> +};
> +
> +static const struct v4l2_subdev_video_ops ov4689_video_ops = {
> + .s_stream = ov4689_s_stream,
> +};
> +
> +static const struct v4l2_subdev_pad_ops ov4689_pad_ops = {
> + .enum_mbus_code = ov4689_enum_mbus_code,
> + .enum_frame_size = ov4689_enum_frame_sizes,
> + .get_fmt = ov4689_get_fmt,
> + .set_fmt = ov4689_set_fmt,
> + .get_selection = ov4689_get_selection,
> +};
> +
> +static const struct v4l2_subdev_ops ov4689_subdev_ops = {
> + .video = &ov4689_video_ops,
> + .pad = &ov4689_pad_ops,
> +};
> +
> +/*
> + * Map userspace (logical) gain to sensor (physical) gain using
> + * ov4689_gain_ranges table.
> + */
> +static int ov4689_map_gain(struct ov4689 *ov4689, int logical_gain, int *result)
> +{
> + const struct device *dev = &ov4689->client->dev;
> + const struct ov4689_gain_range *range;
> + unsigned int n;
> +
> + for (n = 0; n < ARRAY_SIZE(ov4689_gain_ranges); n++) {
> + if (logical_gain >= ov4689_gain_ranges[n].logical_min &&
> + logical_gain <= ov4689_gain_ranges[n].logical_max) {
> + break;
> + }

No need for {} here

> + }
> +
> + if (n == ARRAY_SIZE(ov4689_gain_ranges)) {
> + dev_warn_ratelimited(dev, "no mapping found for gain %d\n",
> + logical_gain);
> + return -EINVAL;
> + }
> +
> + range = &ov4689_gain_ranges[n];
> +
> + *result = clamp(range->offset + (logical_gain) / range->divider,
> + range->physical_min, range->physical_max);
> + return 0;
> +}
> +
> +static int ov4689_set_ctrl(struct v4l2_ctrl *ctrl)
> +{
> + struct ov4689 *ov4689 =
> + container_of(ctrl->handler, struct ov4689, ctrl_handler);
> + struct i2c_client *client = ov4689->client;
> + int sensor_gain;
> + s64 max_expo;
> + int ret;
> +
> + /* Propagate change of current control to all related controls */
> + switch (ctrl->id) {
> + case V4L2_CID_VBLANK:
> + /* Update max exposure while meeting expected vblanking */
> + max_expo = ov4689->cur_mode->height + ctrl->val - 4;
> + __v4l2_ctrl_modify_range(ov4689->exposure,
> + ov4689->exposure->minimum, max_expo,
> + ov4689->exposure->step,
> + ov4689->exposure->default_value);
> + break;
> + }
> +
> + if (!pm_runtime_get_if_in_use(&client->dev))
> + return 0;
> +
> + switch (ctrl->id) {
> + case V4L2_CID_EXPOSURE:
> + /* 4 least significant bits of expsoure are fractional part */
> + ret = ov4689_write_reg(ov4689->client, OV4689_REG_EXPOSURE,
> + OV4689_REG_VALUE_24BIT, ctrl->val << 4);
> + break;
> + case V4L2_CID_ANALOGUE_GAIN:
> + ret = ov4689_map_gain(ov4689, ctrl->val, &sensor_gain);
> +
> + ret = ret ?:
> + ov4689_write_reg(ov4689->client, OV4689_REG_GAIN_H,
> + OV4689_REG_VALUE_08BIT,
> + (sensor_gain >> OV4689_GAIN_H_SHIFT) &
> + OV4689_GAIN_H_MASK);
> + ret = ret ?:
> + ov4689_write_reg(ov4689->client, OV4689_REG_GAIN_L,
> + OV4689_REG_VALUE_08BIT,
> + sensor_gain & OV4689_GAIN_L_MASK);
> + break;
> + case V4L2_CID_VBLANK:
> + ret = ov4689_write_reg(ov4689->client, OV4689_REG_VTS,
> + OV4689_REG_VALUE_16BIT,
> + ctrl->val + ov4689->cur_mode->height);
> + break;
> + case V4L2_CID_TEST_PATTERN:
> + ret = ov4689_enable_test_pattern(ov4689, ctrl->val);
> + break;
> + default:
> + dev_warn(&client->dev, "%s Unhandled id:0x%x, val:0x%x\n",
> + __func__, ctrl->id, ctrl->val);
> + ret = -EINVAL;
> + break;
> + }
> +
> + pm_runtime_put(&client->dev);
> +
> + return ret;
> +}
> +
> +static const struct v4l2_ctrl_ops ov4689_ctrl_ops = {
> + .s_ctrl = ov4689_set_ctrl,
> +};
> +
> +static int ov4689_initialize_controls(struct ov4689 *ov4689)
> +{
> + struct i2c_client *client = v4l2_get_subdevdata(&ov4689->subdev);
> + struct v4l2_fwnode_device_properties props;
> + struct v4l2_ctrl_handler *handler;
> + const struct ov4689_mode *mode;
> + s64 exposure_max, vblank_def;
> + struct v4l2_ctrl *ctrl;
> + s64 h_blank_def;
> + int ret;
> +
> + handler = &ov4689->ctrl_handler;
> + mode = ov4689->cur_mode;
> + ret = v4l2_ctrl_handler_init(handler, 10);
> + if (ret)
> + return ret;
> + handler->lock = &ov4689->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;
> +
> + v4l2_ctrl_new_std(handler, NULL, V4L2_CID_PIXEL_RATE, 0,
> + mode->pixel_rate, 1, mode->pixel_rate);
> +
> + h_blank_def = mode->hts_def - mode->width;
> + ctrl = v4l2_ctrl_new_std(handler, NULL, V4L2_CID_HBLANK, h_blank_def,
> + h_blank_def, 1, h_blank_def);
> + if (ctrl)
> + ctrl->flags |= V4L2_CTRL_FLAG_READ_ONLY;
> +
> + vblank_def = mode->vts_def - mode->height;
> + v4l2_ctrl_new_std(handler, &ov4689_ctrl_ops, V4L2_CID_VBLANK,
> + vblank_def, OV4689_VTS_MAX - mode->height, 1,
> + vblank_def);
> +
> + exposure_max = mode->vts_def - 4;
> + ov4689->exposure =
> + v4l2_ctrl_new_std(handler, &ov4689_ctrl_ops, V4L2_CID_EXPOSURE,
> + OV4689_EXPOSURE_MIN, exposure_max,
> + OV4689_EXPOSURE_STEP, mode->exp_def);
> +
> + v4l2_ctrl_new_std(handler, &ov4689_ctrl_ops, V4L2_CID_ANALOGUE_GAIN,
> + ov4689_gain_ranges[0].logical_min,
> + ov4689_gain_ranges[ARRAY_SIZE(ov4689_gain_ranges) - 1]
> + .logical_max,
> + OV4689_GAIN_STEP, OV4689_GAIN_DEFAULT);
> +
> + v4l2_ctrl_new_std_menu_items(handler, &ov4689_ctrl_ops,
> + V4L2_CID_TEST_PATTERN,
> + ARRAY_SIZE(ov4689_test_pattern_menu) - 1,
> + 0, 0, ov4689_test_pattern_menu);
> +
> + if (handler->error) {
> + ret = handler->error;
> + dev_err(&ov4689->client->dev, "Failed to init controls(%d)\n",
> + ret);
> + goto err_free_handler;
> + }
> +
> + ret = v4l2_fwnode_device_parse(&client->dev, &props);
> + if (ret)
> + goto err_free_handler;
> +
> + ret = v4l2_ctrl_new_fwnode_properties(handler, &ov4689_ctrl_ops,
> + &props);
> + if (ret)
> + goto err_free_handler;
> +
> + ov4689->subdev.ctrl_handler = handler;
> +
> + return 0;
> +
> +err_free_handler:
> + v4l2_ctrl_handler_free(handler);
> +
> + return ret;
> +}
> +
> +static int ov4689_check_sensor_id(struct ov4689 *ov4689,
> + struct i2c_client *client)
> +{
> + struct device *dev = &ov4689->client->dev;
> + u32 id = 0;
> + int ret;
> +
> + ret = ov4689_read_reg(client, OV4689_REG_CHIP_ID,
> + OV4689_REG_VALUE_16BIT, &id);
> + if (ret) {
> + dev_err(dev, "Cannot read sensor ID\n");
> + return ret;
> + }
> +
> + if (id != CHIP_ID) {
> + dev_err(dev, "Unexpected sensor ID %06x, expected %06x\n",
> + id, CHIP_ID);
> + return -ENODEV;
> + }
> +
> + dev_info(dev, "Detected OV%06x sensor\n", CHIP_ID);
> +
> + return 0;
> +}
> +
> +static int ov4689_configure_regulators(struct ov4689 *ov4689)
> +{
> + unsigned int supplies_count = ARRAY_SIZE(ov4689_supply_names);
> + unsigned int i;
> +
> + for (i = 0; i < supplies_count; i++)
> + ov4689->supplies[i].supply = ov4689_supply_names[i];
> +
> + return devm_regulator_bulk_get(&ov4689->client->dev, supplies_count,
> + ov4689->supplies);
> +}
> +
> +static u64 ov4689_check_link_frequency(struct v4l2_fwnode_endpoint *ep)
> +{
> + unsigned int freqs_count = ARRAY_SIZE(link_freq_menu_items);
> + const u64 *freqs = link_freq_menu_items;
> + unsigned int i, j;
> +
> + for (i = 0; i < freqs_count; i++) {
> + for (j = 0; j < ep->nr_of_link_frequencies; j++)
> + if (freqs[i] == ep->link_frequencies[j])
> + return freqs[i];
> + }
> +
> + return 0;
> +}
> +
> +static int ov4689_check_hwcfg(struct device *dev)
> +{
> + struct fwnode_handle *fwnode = dev_fwnode(dev);
> + struct v4l2_fwnode_endpoint bus_cfg = {
> + .bus_type = V4L2_MBUS_CSI2_DPHY,
> + };
> + struct fwnode_handle *endpoint;
> + int ret;
> +
> + endpoint = fwnode_graph_get_next_endpoint(fwnode, NULL);
> + if (!endpoint)
> + return -EINVAL;
> +
> + ret = v4l2_fwnode_endpoint_alloc_parse(endpoint, &bus_cfg);
> + fwnode_handle_put(endpoint);
> + if (ret)
> + return ret;
> +
> + if (bus_cfg.bus.mipi_csi2.num_data_lanes != OV4689_LANES) {
> + dev_err(dev, "Only a 4-lane CSI2 config is supported");
> + ret = -EINVAL;
> + goto out_free_bus_cfg;
> + }
> +
> + if (!bus_cfg.nr_of_link_frequencies) {
> + dev_err(dev, "No link frequencies defined\n");
> + ret = -EINVAL;
> + goto out_free_bus_cfg;
> + }

As the driver has a single supported freq I wonder if it is required
to have it mandatory. I got contradictory feedbacks in the past, so
whatever you have here I guess it's fine (same reasoning goes for dts,
if there's only one accepted item, does it need to be made mandatory
?)

Nits apart, the driver looks sane

Reviewed-by: Jacopo Mondi <jacopo@xxxxxxxxxx>

Thanks
j

> +
> + if (!ov4689_check_link_frequency(&bus_cfg)) {
> + dev_err(dev, "No supported link frequency found\n");
> + ret = -EINVAL;
> + }
> +
> +out_free_bus_cfg:
> + v4l2_fwnode_endpoint_free(&bus_cfg);
> +
> + return ret;
> +}
> +
> +static int ov4689_probe(struct i2c_client *client)
> +{
> + struct device *dev = &client->dev;
> + struct v4l2_subdev *sd;
> + struct ov4689 *ov4689;
> + int ret;
> +
> + ret = ov4689_check_hwcfg(dev);
> + if (ret)
> + return ret;
> +
> + ov4689 = devm_kzalloc(dev, sizeof(*ov4689), GFP_KERNEL);
> + if (!ov4689)
> + return -ENOMEM;
> +
> + ov4689->client = client;
> + ov4689->cur_mode = &supported_modes[OV4689_MODE_2688_1520];
> +
> + ov4689->xvclk = devm_clk_get_optional(dev, NULL);
> + if (IS_ERR(ov4689->xvclk))
> + return dev_err_probe(dev, PTR_ERR(ov4689->xvclk),
> + "Failed to get external clock\n");
> +
> + if (!ov4689->xvclk) {
> + dev_dbg(dev,
> + "No clock provided, using clock-frequency property\n");
> + device_property_read_u32(dev, "clock-frequency",
> + &ov4689->clock_rate);
> + } else {
> + ov4689->clock_rate = clk_get_rate(ov4689->xvclk);
> + }
> +
> + if (ov4689->clock_rate != OV4689_XVCLK_FREQ) {
> + dev_err(dev,
> + "External clock rate mismatch: got %d Hz, expected %d Hz\n",
> + ov4689->clock_rate, OV4689_XVCLK_FREQ);
> + return -EINVAL;
> + }
> +
> + ov4689->reset_gpio = devm_gpiod_get_optional(dev, "reset",
> + GPIOD_OUT_LOW);
> + if (IS_ERR(ov4689->reset_gpio)) {
> + dev_err(dev, "Failed to get reset-gpios\n");
> + return PTR_ERR(ov4689->reset_gpio);
> + }
> +
> + ov4689->pwdn_gpio = devm_gpiod_get_optional(dev, "pwdn", GPIOD_OUT_LOW);
> + if (IS_ERR(ov4689->pwdn_gpio)) {
> + dev_err(dev, "Failed to get pwdn-gpios\n");
> + return PTR_ERR(ov4689->pwdn_gpio);
> + }
> +
> + ret = ov4689_configure_regulators(ov4689);
> + if (ret)
> + return dev_err_probe(dev, ret,
> + "Failed to get power regulators\n");
> +
> + mutex_init(&ov4689->mutex);
> +
> + sd = &ov4689->subdev;
> + v4l2_i2c_subdev_init(sd, client, &ov4689_subdev_ops);
> + ret = ov4689_initialize_controls(ov4689);
> + if (ret)
> + goto err_destroy_mutex;
> +
> + ret = ov4689_power_on(dev);
> + if (ret)
> + goto err_free_handler;
> +
> + ret = ov4689_check_sensor_id(ov4689, client);
> + if (ret)
> + goto err_power_off;
> +
> + sd->internal_ops = &ov4689_internal_ops;
> + sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
> +
> + ov4689->pad.flags = MEDIA_PAD_FL_SOURCE;
> + sd->entity.function = MEDIA_ENT_F_CAM_SENSOR;
> + ret = media_entity_pads_init(&sd->entity, 1, &ov4689->pad);
> + if (ret < 0)
> + goto err_power_off;
> +
> + ret = v4l2_async_register_subdev_sensor(sd);
> + 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(&sd->entity);
> +err_power_off:
> + ov4689_power_off(dev);
> +err_free_handler:
> + v4l2_ctrl_handler_free(&ov4689->ctrl_handler);
> +err_destroy_mutex:
> + mutex_destroy(&ov4689->mutex);
> +
> + return ret;
> +}
> +
> +static void ov4689_remove(struct i2c_client *client)
> +{
> + struct v4l2_subdev *sd = i2c_get_clientdata(client);
> + struct ov4689 *ov4689 = to_ov4689(sd);
> +
> + v4l2_async_unregister_subdev(sd);
> + media_entity_cleanup(&sd->entity);
> +
> + v4l2_ctrl_handler_free(&ov4689->ctrl_handler);
> + mutex_destroy(&ov4689->mutex);
> +
> + pm_runtime_disable(&client->dev);
> + if (!pm_runtime_status_suspended(&client->dev))
> + ov4689_power_off(&client->dev);
> + pm_runtime_set_suspended(&client->dev);
> +}
> +
> +static const struct of_device_id ov4689_of_match[] = {
> + { .compatible = "ovti,ov4689" },
> + {},
> +};
> +MODULE_DEVICE_TABLE(of, ov4689_of_match);
> +
> +static struct i2c_driver ov4689_i2c_driver = {
> + .driver = {
> + .name = "ov4689",
> + .pm = &ov4689_pm_ops,
> + .of_match_table = ov4689_of_match,
> + },
> + .probe_new = ov4689_probe,
> + .remove = ov4689_remove,
> +};
> +
> +module_i2c_driver(ov4689_i2c_driver);
> +
> +MODULE_DESCRIPTION("OmniVision ov4689 sensor driver");
> +MODULE_LICENSE("GPL");
> --
> 2.38.1
>