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- // SPDX-License-Identifier: GPL-2.0-only
- /*
- * OmniVision ov9282 Camera Sensor Driver
- *
- * Copyright (C) 2021 Intel Corporation
- */
- #include <asm/unaligned.h>
- #include <linux/clk.h>
- #include <linux/delay.h>
- #include <linux/i2c.h>
- #include <linux/module.h>
- #include <linux/pm_runtime.h>
- #include <media/v4l2-ctrls.h>
- #include <media/v4l2-fwnode.h>
- #include <media/v4l2-subdev.h>
- /* Streaming Mode */
- #define OV9282_REG_MODE_SELECT 0x0100
- #define OV9282_MODE_STANDBY 0x00
- #define OV9282_MODE_STREAMING 0x01
- /* Lines per frame */
- #define OV9282_REG_LPFR 0x380e
- /* Chip ID */
- #define OV9282_REG_ID 0x300a
- #define OV9282_ID 0x9281
- /* Exposure control */
- #define OV9282_REG_EXPOSURE 0x3500
- #define OV9282_EXPOSURE_MIN 1
- #define OV9282_EXPOSURE_OFFSET 12
- #define OV9282_EXPOSURE_STEP 1
- #define OV9282_EXPOSURE_DEFAULT 0x0282
- /* Analog gain control */
- #define OV9282_REG_AGAIN 0x3509
- #define OV9282_AGAIN_MIN 0x10
- #define OV9282_AGAIN_MAX 0xff
- #define OV9282_AGAIN_STEP 1
- #define OV9282_AGAIN_DEFAULT 0x10
- /* Group hold register */
- #define OV9282_REG_HOLD 0x3308
- /* Input clock rate */
- #define OV9282_INCLK_RATE 24000000
- /* CSI2 HW configuration */
- #define OV9282_LINK_FREQ 400000000
- #define OV9282_NUM_DATA_LANES 2
- #define OV9282_REG_MIN 0x00
- #define OV9282_REG_MAX 0xfffff
- /**
- * struct ov9282_reg - ov9282 sensor register
- * @address: Register address
- * @val: Register value
- */
- struct ov9282_reg {
- u16 address;
- u8 val;
- };
- /**
- * struct ov9282_reg_list - ov9282 sensor register list
- * @num_of_regs: Number of registers in the list
- * @regs: Pointer to register list
- */
- struct ov9282_reg_list {
- u32 num_of_regs;
- const struct ov9282_reg *regs;
- };
- /**
- * struct ov9282_mode - ov9282 sensor mode structure
- * @width: Frame width
- * @height: Frame height
- * @code: Format code
- * @hblank: Horizontal blanking in lines
- * @vblank: Vertical blanking in lines
- * @vblank_min: Minimum vertical blanking in lines
- * @vblank_max: Maximum vertical blanking in lines
- * @pclk: Sensor pixel clock
- * @link_freq_idx: Link frequency index
- * @reg_list: Register list for sensor mode
- */
- struct ov9282_mode {
- u32 width;
- u32 height;
- u32 code;
- u32 hblank;
- u32 vblank;
- u32 vblank_min;
- u32 vblank_max;
- u64 pclk;
- u32 link_freq_idx;
- struct ov9282_reg_list reg_list;
- };
- /**
- * struct ov9282 - ov9282 sensor device structure
- * @dev: Pointer to generic device
- * @client: Pointer to i2c client
- * @sd: V4L2 sub-device
- * @pad: Media pad. Only one pad supported
- * @reset_gpio: Sensor reset gpio
- * @inclk: Sensor input clock
- * @ctrl_handler: V4L2 control handler
- * @link_freq_ctrl: Pointer to link frequency control
- * @pclk_ctrl: Pointer to pixel clock control
- * @hblank_ctrl: Pointer to horizontal blanking control
- * @vblank_ctrl: Pointer to vertical blanking control
- * @exp_ctrl: Pointer to exposure control
- * @again_ctrl: Pointer to analog gain control
- * @vblank: Vertical blanking in lines
- * @cur_mode: Pointer to current selected sensor mode
- * @mutex: Mutex for serializing sensor controls
- * @streaming: Flag indicating streaming state
- */
- struct ov9282 {
- struct device *dev;
- struct i2c_client *client;
- struct v4l2_subdev sd;
- struct media_pad pad;
- struct gpio_desc *reset_gpio;
- struct clk *inclk;
- struct v4l2_ctrl_handler ctrl_handler;
- struct v4l2_ctrl *link_freq_ctrl;
- struct v4l2_ctrl *pclk_ctrl;
- struct v4l2_ctrl *hblank_ctrl;
- struct v4l2_ctrl *vblank_ctrl;
- struct {
- struct v4l2_ctrl *exp_ctrl;
- struct v4l2_ctrl *again_ctrl;
- };
- u32 vblank;
- const struct ov9282_mode *cur_mode;
- struct mutex mutex;
- bool streaming;
- };
- static const s64 link_freq[] = {
- OV9282_LINK_FREQ,
- };
- /* Sensor mode registers */
- static const struct ov9282_reg mode_1280x720_regs[] = {
- {0x0302, 0x32},
- {0x030d, 0x50},
- {0x030e, 0x02},
- {0x3001, 0x00},
- {0x3004, 0x00},
- {0x3005, 0x00},
- {0x3006, 0x04},
- {0x3011, 0x0a},
- {0x3013, 0x18},
- {0x301c, 0xf0},
- {0x3022, 0x01},
- {0x3030, 0x10},
- {0x3039, 0x32},
- {0x303a, 0x00},
- {0x3500, 0x00},
- {0x3501, 0x5f},
- {0x3502, 0x1e},
- {0x3503, 0x08},
- {0x3505, 0x8c},
- {0x3507, 0x03},
- {0x3508, 0x00},
- {0x3509, 0x10},
- {0x3610, 0x80},
- {0x3611, 0xa0},
- {0x3620, 0x6e},
- {0x3632, 0x56},
- {0x3633, 0x78},
- {0x3666, 0x00},
- {0x366f, 0x5a},
- {0x3680, 0x84},
- {0x3712, 0x80},
- {0x372d, 0x22},
- {0x3731, 0x80},
- {0x3732, 0x30},
- {0x3778, 0x00},
- {0x377d, 0x22},
- {0x3788, 0x02},
- {0x3789, 0xa4},
- {0x378a, 0x00},
- {0x378b, 0x4a},
- {0x3799, 0x20},
- {0x3800, 0x00},
- {0x3801, 0x00},
- {0x3802, 0x00},
- {0x3803, 0x00},
- {0x3804, 0x05},
- {0x3805, 0x0f},
- {0x3806, 0x02},
- {0x3807, 0xdf},
- {0x3808, 0x05},
- {0x3809, 0x00},
- {0x380a, 0x02},
- {0x380b, 0xd0},
- {0x380c, 0x05},
- {0x380d, 0xfa},
- {0x380e, 0x06},
- {0x380f, 0xce},
- {0x3810, 0x00},
- {0x3811, 0x08},
- {0x3812, 0x00},
- {0x3813, 0x08},
- {0x3814, 0x11},
- {0x3815, 0x11},
- {0x3820, 0x3c},
- {0x3821, 0x84},
- {0x3881, 0x42},
- {0x38a8, 0x02},
- {0x38a9, 0x80},
- {0x38b1, 0x00},
- {0x38c4, 0x00},
- {0x38c5, 0xc0},
- {0x38c6, 0x04},
- {0x38c7, 0x80},
- {0x3920, 0xff},
- {0x4003, 0x40},
- {0x4008, 0x02},
- {0x4009, 0x05},
- {0x400c, 0x00},
- {0x400d, 0x03},
- {0x4010, 0x40},
- {0x4043, 0x40},
- {0x4307, 0x30},
- {0x4317, 0x00},
- {0x4501, 0x00},
- {0x4507, 0x00},
- {0x4509, 0x80},
- {0x450a, 0x08},
- {0x4601, 0x04},
- {0x470f, 0x00},
- {0x4f07, 0x00},
- {0x4800, 0x20},
- {0x5000, 0x9f},
- {0x5001, 0x00},
- {0x5e00, 0x00},
- {0x5d00, 0x07},
- {0x5d01, 0x00},
- {0x0101, 0x01},
- {0x1000, 0x03},
- {0x5a08, 0x84},
- };
- /* Supported sensor mode configurations */
- static const struct ov9282_mode supported_mode = {
- .width = 1280,
- .height = 720,
- .hblank = 250,
- .vblank = 1022,
- .vblank_min = 151,
- .vblank_max = 51540,
- .pclk = 160000000,
- .link_freq_idx = 0,
- .code = MEDIA_BUS_FMT_Y10_1X10,
- .reg_list = {
- .num_of_regs = ARRAY_SIZE(mode_1280x720_regs),
- .regs = mode_1280x720_regs,
- },
- };
- /**
- * to_ov9282() - ov9282 V4L2 sub-device to ov9282 device.
- * @subdev: pointer to ov9282 V4L2 sub-device
- *
- * Return: pointer to ov9282 device
- */
- static inline struct ov9282 *to_ov9282(struct v4l2_subdev *subdev)
- {
- return container_of(subdev, struct ov9282, sd);
- }
- /**
- * ov9282_read_reg() - Read registers.
- * @ov9282: pointer to ov9282 device
- * @reg: register address
- * @len: length of bytes to read. Max supported bytes is 4
- * @val: pointer to register value to be filled.
- *
- * Return: 0 if successful, error code otherwise.
- */
- static int ov9282_read_reg(struct ov9282 *ov9282, u16 reg, u32 len, u32 *val)
- {
- struct i2c_client *client = v4l2_get_subdevdata(&ov9282->sd);
- struct i2c_msg msgs[2] = {0};
- u8 addr_buf[2] = {0};
- u8 data_buf[4] = {0};
- int ret;
- if (WARN_ON(len > 4))
- return -EINVAL;
- put_unaligned_be16(reg, addr_buf);
- /* Write register address */
- msgs[0].addr = client->addr;
- msgs[0].flags = 0;
- msgs[0].len = ARRAY_SIZE(addr_buf);
- msgs[0].buf = addr_buf;
- /* Read data from register */
- msgs[1].addr = client->addr;
- msgs[1].flags = I2C_M_RD;
- msgs[1].len = len;
- msgs[1].buf = &data_buf[4 - len];
- ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
- if (ret != ARRAY_SIZE(msgs))
- return -EIO;
- *val = get_unaligned_be32(data_buf);
- return 0;
- }
- /**
- * ov9282_write_reg() - Write register
- * @ov9282: pointer to ov9282 device
- * @reg: register address
- * @len: length of bytes. Max supported bytes is 4
- * @val: register value
- *
- * Return: 0 if successful, error code otherwise.
- */
- static int ov9282_write_reg(struct ov9282 *ov9282, u16 reg, u32 len, u32 val)
- {
- struct i2c_client *client = v4l2_get_subdevdata(&ov9282->sd);
- u8 buf[6] = {0};
- if (WARN_ON(len > 4))
- return -EINVAL;
- put_unaligned_be16(reg, buf);
- put_unaligned_be32(val << (8 * (4 - len)), buf + 2);
- if (i2c_master_send(client, buf, len + 2) != len + 2)
- return -EIO;
- return 0;
- }
- /**
- * ov9282_write_regs() - Write a list of registers
- * @ov9282: pointer to ov9282 device
- * @regs: list of registers to be written
- * @len: length of registers array
- *
- * Return: 0 if successful, error code otherwise.
- */
- static int ov9282_write_regs(struct ov9282 *ov9282,
- const struct ov9282_reg *regs, u32 len)
- {
- unsigned int i;
- int ret;
- for (i = 0; i < len; i++) {
- ret = ov9282_write_reg(ov9282, regs[i].address, 1, regs[i].val);
- if (ret)
- return ret;
- }
- return 0;
- }
- /**
- * ov9282_update_controls() - Update control ranges based on streaming mode
- * @ov9282: pointer to ov9282 device
- * @mode: pointer to ov9282_mode sensor mode
- *
- * Return: 0 if successful, error code otherwise.
- */
- static int ov9282_update_controls(struct ov9282 *ov9282,
- const struct ov9282_mode *mode)
- {
- int ret;
- ret = __v4l2_ctrl_s_ctrl(ov9282->link_freq_ctrl, mode->link_freq_idx);
- if (ret)
- return ret;
- ret = __v4l2_ctrl_s_ctrl(ov9282->hblank_ctrl, mode->hblank);
- if (ret)
- return ret;
- return __v4l2_ctrl_modify_range(ov9282->vblank_ctrl, mode->vblank_min,
- mode->vblank_max, 1, mode->vblank);
- }
- /**
- * ov9282_update_exp_gain() - Set updated exposure and gain
- * @ov9282: pointer to ov9282 device
- * @exposure: updated exposure value
- * @gain: updated analog gain value
- *
- * Return: 0 if successful, error code otherwise.
- */
- static int ov9282_update_exp_gain(struct ov9282 *ov9282, u32 exposure, u32 gain)
- {
- u32 lpfr;
- int ret;
- lpfr = ov9282->vblank + ov9282->cur_mode->height;
- dev_dbg(ov9282->dev, "Set exp %u, analog gain %u, lpfr %u",
- exposure, gain, lpfr);
- ret = ov9282_write_reg(ov9282, OV9282_REG_HOLD, 1, 1);
- if (ret)
- return ret;
- ret = ov9282_write_reg(ov9282, OV9282_REG_LPFR, 2, lpfr);
- if (ret)
- goto error_release_group_hold;
- ret = ov9282_write_reg(ov9282, OV9282_REG_EXPOSURE, 3, exposure << 4);
- if (ret)
- goto error_release_group_hold;
- ret = ov9282_write_reg(ov9282, OV9282_REG_AGAIN, 1, gain);
- error_release_group_hold:
- ov9282_write_reg(ov9282, OV9282_REG_HOLD, 1, 0);
- return ret;
- }
- /**
- * ov9282_set_ctrl() - Set subdevice control
- * @ctrl: pointer to v4l2_ctrl structure
- *
- * Supported controls:
- * - V4L2_CID_VBLANK
- * - cluster controls:
- * - V4L2_CID_ANALOGUE_GAIN
- * - V4L2_CID_EXPOSURE
- *
- * Return: 0 if successful, error code otherwise.
- */
- static int ov9282_set_ctrl(struct v4l2_ctrl *ctrl)
- {
- struct ov9282 *ov9282 =
- container_of(ctrl->handler, struct ov9282, ctrl_handler);
- u32 analog_gain;
- u32 exposure;
- int ret;
- switch (ctrl->id) {
- case V4L2_CID_VBLANK:
- ov9282->vblank = ov9282->vblank_ctrl->val;
- dev_dbg(ov9282->dev, "Received vblank %u, new lpfr %u",
- ov9282->vblank,
- ov9282->vblank + ov9282->cur_mode->height);
- ret = __v4l2_ctrl_modify_range(ov9282->exp_ctrl,
- OV9282_EXPOSURE_MIN,
- ov9282->vblank +
- ov9282->cur_mode->height -
- OV9282_EXPOSURE_OFFSET,
- 1, OV9282_EXPOSURE_DEFAULT);
- break;
- case V4L2_CID_EXPOSURE:
- /* Set controls only if sensor is in power on state */
- if (!pm_runtime_get_if_in_use(ov9282->dev))
- return 0;
- exposure = ctrl->val;
- analog_gain = ov9282->again_ctrl->val;
- dev_dbg(ov9282->dev, "Received exp %u, analog gain %u",
- exposure, analog_gain);
- ret = ov9282_update_exp_gain(ov9282, exposure, analog_gain);
- pm_runtime_put(ov9282->dev);
- break;
- default:
- dev_err(ov9282->dev, "Invalid control %d", ctrl->id);
- ret = -EINVAL;
- }
- return ret;
- }
- /* V4l2 subdevice control ops*/
- static const struct v4l2_ctrl_ops ov9282_ctrl_ops = {
- .s_ctrl = ov9282_set_ctrl,
- };
- /**
- * ov9282_enum_mbus_code() - Enumerate V4L2 sub-device mbus codes
- * @sd: pointer to ov9282 V4L2 sub-device structure
- * @sd_state: V4L2 sub-device configuration
- * @code: V4L2 sub-device code enumeration need to be filled
- *
- * Return: 0 if successful, error code otherwise.
- */
- static int ov9282_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 = supported_mode.code;
- return 0;
- }
- /**
- * ov9282_enum_frame_size() - Enumerate V4L2 sub-device frame sizes
- * @sd: pointer to ov9282 V4L2 sub-device structure
- * @sd_state: V4L2 sub-device configuration
- * @fsize: V4L2 sub-device size enumeration need to be filled
- *
- * Return: 0 if successful, error code otherwise.
- */
- static int ov9282_enum_frame_size(struct v4l2_subdev *sd,
- struct v4l2_subdev_state *sd_state,
- struct v4l2_subdev_frame_size_enum *fsize)
- {
- if (fsize->index > 0)
- return -EINVAL;
- if (fsize->code != supported_mode.code)
- return -EINVAL;
- fsize->min_width = supported_mode.width;
- fsize->max_width = fsize->min_width;
- fsize->min_height = supported_mode.height;
- fsize->max_height = fsize->min_height;
- return 0;
- }
- /**
- * ov9282_fill_pad_format() - Fill subdevice pad format
- * from selected sensor mode
- * @ov9282: pointer to ov9282 device
- * @mode: pointer to ov9282_mode sensor mode
- * @fmt: V4L2 sub-device format need to be filled
- */
- static void ov9282_fill_pad_format(struct ov9282 *ov9282,
- const struct ov9282_mode *mode,
- struct v4l2_subdev_format *fmt)
- {
- fmt->format.width = mode->width;
- fmt->format.height = mode->height;
- fmt->format.code = mode->code;
- fmt->format.field = V4L2_FIELD_NONE;
- fmt->format.colorspace = V4L2_COLORSPACE_RAW;
- fmt->format.ycbcr_enc = V4L2_YCBCR_ENC_DEFAULT;
- fmt->format.quantization = V4L2_QUANTIZATION_DEFAULT;
- fmt->format.xfer_func = V4L2_XFER_FUNC_NONE;
- }
- /**
- * ov9282_get_pad_format() - Get subdevice pad format
- * @sd: pointer to ov9282 V4L2 sub-device structure
- * @sd_state: V4L2 sub-device configuration
- * @fmt: V4L2 sub-device format need to be set
- *
- * Return: 0 if successful, error code otherwise.
- */
- static int ov9282_get_pad_format(struct v4l2_subdev *sd,
- struct v4l2_subdev_state *sd_state,
- struct v4l2_subdev_format *fmt)
- {
- struct ov9282 *ov9282 = to_ov9282(sd);
- mutex_lock(&ov9282->mutex);
- if (fmt->which == V4L2_SUBDEV_FORMAT_TRY) {
- struct v4l2_mbus_framefmt *framefmt;
- framefmt = v4l2_subdev_get_try_format(sd, sd_state, fmt->pad);
- fmt->format = *framefmt;
- } else {
- ov9282_fill_pad_format(ov9282, ov9282->cur_mode, fmt);
- }
- mutex_unlock(&ov9282->mutex);
- return 0;
- }
- /**
- * ov9282_set_pad_format() - Set subdevice pad format
- * @sd: pointer to ov9282 V4L2 sub-device structure
- * @sd_state: V4L2 sub-device configuration
- * @fmt: V4L2 sub-device format need to be set
- *
- * Return: 0 if successful, error code otherwise.
- */
- static int ov9282_set_pad_format(struct v4l2_subdev *sd,
- struct v4l2_subdev_state *sd_state,
- struct v4l2_subdev_format *fmt)
- {
- struct ov9282 *ov9282 = to_ov9282(sd);
- const struct ov9282_mode *mode;
- int ret = 0;
- mutex_lock(&ov9282->mutex);
- mode = &supported_mode;
- ov9282_fill_pad_format(ov9282, mode, fmt);
- if (fmt->which == V4L2_SUBDEV_FORMAT_TRY) {
- struct v4l2_mbus_framefmt *framefmt;
- framefmt = v4l2_subdev_get_try_format(sd, sd_state, fmt->pad);
- *framefmt = fmt->format;
- } else {
- ret = ov9282_update_controls(ov9282, mode);
- if (!ret)
- ov9282->cur_mode = mode;
- }
- mutex_unlock(&ov9282->mutex);
- return ret;
- }
- /**
- * ov9282_init_pad_cfg() - Initialize sub-device pad configuration
- * @sd: pointer to ov9282 V4L2 sub-device structure
- * @sd_state: V4L2 sub-device configuration
- *
- * Return: 0 if successful, error code otherwise.
- */
- static int ov9282_init_pad_cfg(struct v4l2_subdev *sd,
- struct v4l2_subdev_state *sd_state)
- {
- struct ov9282 *ov9282 = to_ov9282(sd);
- struct v4l2_subdev_format fmt = { 0 };
- fmt.which = sd_state ? V4L2_SUBDEV_FORMAT_TRY : V4L2_SUBDEV_FORMAT_ACTIVE;
- ov9282_fill_pad_format(ov9282, &supported_mode, &fmt);
- return ov9282_set_pad_format(sd, sd_state, &fmt);
- }
- /**
- * ov9282_start_streaming() - Start sensor stream
- * @ov9282: pointer to ov9282 device
- *
- * Return: 0 if successful, error code otherwise.
- */
- static int ov9282_start_streaming(struct ov9282 *ov9282)
- {
- const struct ov9282_reg_list *reg_list;
- int ret;
- /* Write sensor mode registers */
- reg_list = &ov9282->cur_mode->reg_list;
- ret = ov9282_write_regs(ov9282, reg_list->regs, reg_list->num_of_regs);
- if (ret) {
- dev_err(ov9282->dev, "fail to write initial registers");
- return ret;
- }
- /* Setup handler will write actual exposure and gain */
- ret = __v4l2_ctrl_handler_setup(ov9282->sd.ctrl_handler);
- if (ret) {
- dev_err(ov9282->dev, "fail to setup handler");
- return ret;
- }
- /* Start streaming */
- ret = ov9282_write_reg(ov9282, OV9282_REG_MODE_SELECT,
- 1, OV9282_MODE_STREAMING);
- if (ret) {
- dev_err(ov9282->dev, "fail to start streaming");
- return ret;
- }
- return 0;
- }
- /**
- * ov9282_stop_streaming() - Stop sensor stream
- * @ov9282: pointer to ov9282 device
- *
- * Return: 0 if successful, error code otherwise.
- */
- static int ov9282_stop_streaming(struct ov9282 *ov9282)
- {
- return ov9282_write_reg(ov9282, OV9282_REG_MODE_SELECT,
- 1, OV9282_MODE_STANDBY);
- }
- /**
- * ov9282_set_stream() - Enable sensor streaming
- * @sd: pointer to ov9282 subdevice
- * @enable: set to enable sensor streaming
- *
- * Return: 0 if successful, error code otherwise.
- */
- static int ov9282_set_stream(struct v4l2_subdev *sd, int enable)
- {
- struct ov9282 *ov9282 = to_ov9282(sd);
- int ret;
- mutex_lock(&ov9282->mutex);
- if (ov9282->streaming == enable) {
- mutex_unlock(&ov9282->mutex);
- return 0;
- }
- if (enable) {
- ret = pm_runtime_resume_and_get(ov9282->dev);
- if (ret)
- goto error_unlock;
- ret = ov9282_start_streaming(ov9282);
- if (ret)
- goto error_power_off;
- } else {
- ov9282_stop_streaming(ov9282);
- pm_runtime_put(ov9282->dev);
- }
- ov9282->streaming = enable;
- mutex_unlock(&ov9282->mutex);
- return 0;
- error_power_off:
- pm_runtime_put(ov9282->dev);
- error_unlock:
- mutex_unlock(&ov9282->mutex);
- return ret;
- }
- /**
- * ov9282_detect() - Detect ov9282 sensor
- * @ov9282: pointer to ov9282 device
- *
- * Return: 0 if successful, -EIO if sensor id does not match
- */
- static int ov9282_detect(struct ov9282 *ov9282)
- {
- int ret;
- u32 val;
- ret = ov9282_read_reg(ov9282, OV9282_REG_ID, 2, &val);
- if (ret)
- return ret;
- if (val != OV9282_ID) {
- dev_err(ov9282->dev, "chip id mismatch: %x!=%x",
- OV9282_ID, val);
- return -ENXIO;
- }
- return 0;
- }
- /**
- * ov9282_parse_hw_config() - Parse HW configuration and check if supported
- * @ov9282: pointer to ov9282 device
- *
- * Return: 0 if successful, error code otherwise.
- */
- static int ov9282_parse_hw_config(struct ov9282 *ov9282)
- {
- struct fwnode_handle *fwnode = dev_fwnode(ov9282->dev);
- struct v4l2_fwnode_endpoint bus_cfg = {
- .bus_type = V4L2_MBUS_CSI2_DPHY
- };
- struct fwnode_handle *ep;
- unsigned long rate;
- unsigned int i;
- int ret;
- if (!fwnode)
- return -ENXIO;
- /* Request optional reset pin */
- ov9282->reset_gpio = devm_gpiod_get_optional(ov9282->dev, "reset",
- GPIOD_OUT_LOW);
- if (IS_ERR(ov9282->reset_gpio)) {
- dev_err(ov9282->dev, "failed to get reset gpio %ld",
- PTR_ERR(ov9282->reset_gpio));
- return PTR_ERR(ov9282->reset_gpio);
- }
- /* Get sensor input clock */
- ov9282->inclk = devm_clk_get(ov9282->dev, NULL);
- if (IS_ERR(ov9282->inclk)) {
- dev_err(ov9282->dev, "could not get inclk");
- return PTR_ERR(ov9282->inclk);
- }
- rate = clk_get_rate(ov9282->inclk);
- if (rate != OV9282_INCLK_RATE) {
- dev_err(ov9282->dev, "inclk frequency mismatch");
- 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.bus.mipi_csi2.num_data_lanes != OV9282_NUM_DATA_LANES) {
- dev_err(ov9282->dev,
- "number of CSI2 data lanes %d is not supported",
- bus_cfg.bus.mipi_csi2.num_data_lanes);
- ret = -EINVAL;
- goto done_endpoint_free;
- }
- if (!bus_cfg.nr_of_link_frequencies) {
- dev_err(ov9282->dev, "no link frequencies defined");
- ret = -EINVAL;
- goto done_endpoint_free;
- }
- for (i = 0; i < bus_cfg.nr_of_link_frequencies; i++)
- if (bus_cfg.link_frequencies[i] == OV9282_LINK_FREQ)
- goto done_endpoint_free;
- ret = -EINVAL;
- done_endpoint_free:
- v4l2_fwnode_endpoint_free(&bus_cfg);
- return ret;
- }
- /* V4l2 subdevice ops */
- static const struct v4l2_subdev_video_ops ov9282_video_ops = {
- .s_stream = ov9282_set_stream,
- };
- static const struct v4l2_subdev_pad_ops ov9282_pad_ops = {
- .init_cfg = ov9282_init_pad_cfg,
- .enum_mbus_code = ov9282_enum_mbus_code,
- .enum_frame_size = ov9282_enum_frame_size,
- .get_fmt = ov9282_get_pad_format,
- .set_fmt = ov9282_set_pad_format,
- };
- static const struct v4l2_subdev_ops ov9282_subdev_ops = {
- .video = &ov9282_video_ops,
- .pad = &ov9282_pad_ops,
- };
- /**
- * ov9282_power_on() - Sensor power on sequence
- * @dev: pointer to i2c device
- *
- * Return: 0 if successful, error code otherwise.
- */
- static int ov9282_power_on(struct device *dev)
- {
- struct v4l2_subdev *sd = dev_get_drvdata(dev);
- struct ov9282 *ov9282 = to_ov9282(sd);
- int ret;
- usleep_range(400, 600);
- gpiod_set_value_cansleep(ov9282->reset_gpio, 1);
- ret = clk_prepare_enable(ov9282->inclk);
- if (ret) {
- dev_err(ov9282->dev, "fail to enable inclk");
- goto error_reset;
- }
- usleep_range(400, 600);
- return 0;
- error_reset:
- gpiod_set_value_cansleep(ov9282->reset_gpio, 0);
- return ret;
- }
- /**
- * ov9282_power_off() - Sensor power off sequence
- * @dev: pointer to i2c device
- *
- * Return: 0 if successful, error code otherwise.
- */
- static int ov9282_power_off(struct device *dev)
- {
- struct v4l2_subdev *sd = dev_get_drvdata(dev);
- struct ov9282 *ov9282 = to_ov9282(sd);
- gpiod_set_value_cansleep(ov9282->reset_gpio, 0);
- clk_disable_unprepare(ov9282->inclk);
- return 0;
- }
- /**
- * ov9282_init_controls() - Initialize sensor subdevice controls
- * @ov9282: pointer to ov9282 device
- *
- * Return: 0 if successful, error code otherwise.
- */
- static int ov9282_init_controls(struct ov9282 *ov9282)
- {
- struct v4l2_ctrl_handler *ctrl_hdlr = &ov9282->ctrl_handler;
- const struct ov9282_mode *mode = ov9282->cur_mode;
- u32 lpfr;
- int ret;
- ret = v4l2_ctrl_handler_init(ctrl_hdlr, 6);
- if (ret)
- return ret;
- /* Serialize controls with sensor device */
- ctrl_hdlr->lock = &ov9282->mutex;
- /* Initialize exposure and gain */
- lpfr = mode->vblank + mode->height;
- ov9282->exp_ctrl = v4l2_ctrl_new_std(ctrl_hdlr,
- &ov9282_ctrl_ops,
- V4L2_CID_EXPOSURE,
- OV9282_EXPOSURE_MIN,
- lpfr - OV9282_EXPOSURE_OFFSET,
- OV9282_EXPOSURE_STEP,
- OV9282_EXPOSURE_DEFAULT);
- ov9282->again_ctrl = v4l2_ctrl_new_std(ctrl_hdlr,
- &ov9282_ctrl_ops,
- V4L2_CID_ANALOGUE_GAIN,
- OV9282_AGAIN_MIN,
- OV9282_AGAIN_MAX,
- OV9282_AGAIN_STEP,
- OV9282_AGAIN_DEFAULT);
- v4l2_ctrl_cluster(2, &ov9282->exp_ctrl);
- ov9282->vblank_ctrl = v4l2_ctrl_new_std(ctrl_hdlr,
- &ov9282_ctrl_ops,
- V4L2_CID_VBLANK,
- mode->vblank_min,
- mode->vblank_max,
- 1, mode->vblank);
- /* Read only controls */
- ov9282->pclk_ctrl = v4l2_ctrl_new_std(ctrl_hdlr,
- &ov9282_ctrl_ops,
- V4L2_CID_PIXEL_RATE,
- mode->pclk, mode->pclk,
- 1, mode->pclk);
- ov9282->link_freq_ctrl = v4l2_ctrl_new_int_menu(ctrl_hdlr,
- &ov9282_ctrl_ops,
- V4L2_CID_LINK_FREQ,
- ARRAY_SIZE(link_freq) -
- 1,
- mode->link_freq_idx,
- link_freq);
- if (ov9282->link_freq_ctrl)
- ov9282->link_freq_ctrl->flags |= V4L2_CTRL_FLAG_READ_ONLY;
- ov9282->hblank_ctrl = v4l2_ctrl_new_std(ctrl_hdlr,
- &ov9282_ctrl_ops,
- V4L2_CID_HBLANK,
- OV9282_REG_MIN,
- OV9282_REG_MAX,
- 1, mode->hblank);
- if (ov9282->hblank_ctrl)
- ov9282->hblank_ctrl->flags |= V4L2_CTRL_FLAG_READ_ONLY;
- if (ctrl_hdlr->error) {
- dev_err(ov9282->dev, "control init failed: %d",
- ctrl_hdlr->error);
- v4l2_ctrl_handler_free(ctrl_hdlr);
- return ctrl_hdlr->error;
- }
- ov9282->sd.ctrl_handler = ctrl_hdlr;
- return 0;
- }
- /**
- * ov9282_probe() - I2C client device binding
- * @client: pointer to i2c client device
- *
- * Return: 0 if successful, error code otherwise.
- */
- static int ov9282_probe(struct i2c_client *client)
- {
- struct ov9282 *ov9282;
- int ret;
- ov9282 = devm_kzalloc(&client->dev, sizeof(*ov9282), GFP_KERNEL);
- if (!ov9282)
- return -ENOMEM;
- ov9282->dev = &client->dev;
- /* Initialize subdev */
- v4l2_i2c_subdev_init(&ov9282->sd, client, &ov9282_subdev_ops);
- ret = ov9282_parse_hw_config(ov9282);
- if (ret) {
- dev_err(ov9282->dev, "HW configuration is not supported");
- return ret;
- }
- mutex_init(&ov9282->mutex);
- ret = ov9282_power_on(ov9282->dev);
- if (ret) {
- dev_err(ov9282->dev, "failed to power-on the sensor");
- goto error_mutex_destroy;
- }
- /* Check module identity */
- ret = ov9282_detect(ov9282);
- if (ret) {
- dev_err(ov9282->dev, "failed to find sensor: %d", ret);
- goto error_power_off;
- }
- /* Set default mode to max resolution */
- ov9282->cur_mode = &supported_mode;
- ov9282->vblank = ov9282->cur_mode->vblank;
- ret = ov9282_init_controls(ov9282);
- if (ret) {
- dev_err(ov9282->dev, "failed to init controls: %d", ret);
- goto error_power_off;
- }
- /* Initialize subdev */
- ov9282->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
- ov9282->sd.entity.function = MEDIA_ENT_F_CAM_SENSOR;
- /* Initialize source pad */
- ov9282->pad.flags = MEDIA_PAD_FL_SOURCE;
- ret = media_entity_pads_init(&ov9282->sd.entity, 1, &ov9282->pad);
- if (ret) {
- dev_err(ov9282->dev, "failed to init entity pads: %d", ret);
- goto error_handler_free;
- }
- ret = v4l2_async_register_subdev_sensor(&ov9282->sd);
- if (ret < 0) {
- dev_err(ov9282->dev,
- "failed to register async subdev: %d", ret);
- goto error_media_entity;
- }
- pm_runtime_set_active(ov9282->dev);
- pm_runtime_enable(ov9282->dev);
- pm_runtime_idle(ov9282->dev);
- return 0;
- error_media_entity:
- media_entity_cleanup(&ov9282->sd.entity);
- error_handler_free:
- v4l2_ctrl_handler_free(ov9282->sd.ctrl_handler);
- error_power_off:
- ov9282_power_off(ov9282->dev);
- error_mutex_destroy:
- mutex_destroy(&ov9282->mutex);
- return ret;
- }
- /**
- * ov9282_remove() - I2C client device unbinding
- * @client: pointer to I2C client device
- *
- * Return: 0 if successful, error code otherwise.
- */
- static void ov9282_remove(struct i2c_client *client)
- {
- struct v4l2_subdev *sd = i2c_get_clientdata(client);
- struct ov9282 *ov9282 = to_ov9282(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))
- ov9282_power_off(&client->dev);
- pm_runtime_set_suspended(&client->dev);
- mutex_destroy(&ov9282->mutex);
- }
- static const struct dev_pm_ops ov9282_pm_ops = {
- SET_RUNTIME_PM_OPS(ov9282_power_off, ov9282_power_on, NULL)
- };
- static const struct of_device_id ov9282_of_match[] = {
- { .compatible = "ovti,ov9282" },
- { }
- };
- MODULE_DEVICE_TABLE(of, ov9282_of_match);
- static struct i2c_driver ov9282_driver = {
- .probe_new = ov9282_probe,
- .remove = ov9282_remove,
- .driver = {
- .name = "ov9282",
- .pm = &ov9282_pm_ops,
- .of_match_table = ov9282_of_match,
- },
- };
- module_i2c_driver(ov9282_driver);
- MODULE_DESCRIPTION("OmniVision ov9282 sensor driver");
- MODULE_LICENSE("GPL");
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