--- /dev/null
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Sony imx334 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 IMX334_REG_MODE_SELECT 0x3000
+#define IMX334_MODE_STANDBY 0x01
+#define IMX334_MODE_STREAMING 0x00
+
+/* Lines per frame */
+#define IMX334_REG_LPFR 0x3030
+
+/* Chip ID */
+#define IMX334_REG_ID 0x3044
+#define IMX334_ID 0x1e
+
+/* Exposure control */
+#define IMX334_REG_SHUTTER 0x3058
+#define IMX334_EXPOSURE_MIN 1
+#define IMX334_EXPOSURE_OFFSET 5
+#define IMX334_EXPOSURE_STEP 1
+#define IMX334_EXPOSURE_DEFAULT 0x0648
+
+/* Analog gain control */
+#define IMX334_REG_AGAIN 0x30e8
+#define IMX334_AGAIN_MIN 0
+#define IMX334_AGAIN_MAX 240
+#define IMX334_AGAIN_STEP 1
+#define IMX334_AGAIN_DEFAULT 0
+
+/* Group hold register */
+#define IMX334_REG_HOLD 0x3001
+
+/* Input clock rate */
+#define IMX334_INCLK_RATE 24000000
+
+/* CSI2 HW configuration */
+#define IMX334_LINK_FREQ 891000000
+#define IMX334_NUM_DATA_LANES 4
+
+#define IMX334_REG_MIN 0x00
+#define IMX334_REG_MAX 0xfffff
+
+/**
+ * struct imx334_reg - imx334 sensor register
+ * @address: Register address
+ * @val: Register value
+ */
+struct imx334_reg {
+ u16 address;
+ u8 val;
+};
+
+/**
+ * struct imx334_reg_list - imx334 sensor register list
+ * @num_of_regs: Number of registers in the list
+ * @regs: Pointer to register list
+ */
+struct imx334_reg_list {
+ u32 num_of_regs;
+ const struct imx334_reg *regs;
+};
+
+/**
+ * struct imx334_mode - imx334 sensor mode structure
+ * @width: Frame width
+ * @height: Frame height
+ * @code: Format code
+ * @hblank: Horizontal blanking in lines
+ * @vblank: Vertical blanking in lines
+ * @vblank_min: Minimal 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 imx334_mode {
+ u32 width;
+ u32 height;
+ u32 code;
+ u32 hblank;
+ u32 vblank;
+ u32 vblank_min;
+ u32 vblank_max;
+ u64 pclk;
+ u32 link_freq_idx;
+ struct imx334_reg_list reg_list;
+};
+
+/**
+ * struct imx334 - imx334 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 imx334 {
+ 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 imx334_mode *cur_mode;
+ struct mutex mutex;
+ bool streaming;
+};
+
+static const s64 link_freq[] = {
+ IMX334_LINK_FREQ,
+};
+
+/* Sensor mode registers */
+static const struct imx334_reg mode_3840x2160_regs[] = {
+ {0x3000, 0x01},
+ {0x3002, 0x00},
+ {0x3018, 0x04},
+ {0x37b0, 0x36},
+ {0x304c, 0x00},
+ {0x300c, 0x3b},
+ {0x300d, 0x2a},
+ {0x3034, 0x26},
+ {0x3035, 0x02},
+ {0x314c, 0x29},
+ {0x314d, 0x01},
+ {0x315a, 0x02},
+ {0x3168, 0xa0},
+ {0x316a, 0x7e},
+ {0x3288, 0x21},
+ {0x328a, 0x02},
+ {0x302c, 0x3c},
+ {0x302e, 0x00},
+ {0x302f, 0x0f},
+ {0x3076, 0x70},
+ {0x3077, 0x08},
+ {0x3090, 0x70},
+ {0x3091, 0x08},
+ {0x30d8, 0x20},
+ {0x30d9, 0x12},
+ {0x3308, 0x70},
+ {0x3309, 0x08},
+ {0x3414, 0x05},
+ {0x3416, 0x18},
+ {0x35ac, 0x0e},
+ {0x3648, 0x01},
+ {0x364a, 0x04},
+ {0x364c, 0x04},
+ {0x3678, 0x01},
+ {0x367c, 0x31},
+ {0x367e, 0x31},
+ {0x3708, 0x02},
+ {0x3714, 0x01},
+ {0x3715, 0x02},
+ {0x3716, 0x02},
+ {0x3717, 0x02},
+ {0x371c, 0x3d},
+ {0x371d, 0x3f},
+ {0x372c, 0x00},
+ {0x372d, 0x00},
+ {0x372e, 0x46},
+ {0x372f, 0x00},
+ {0x3730, 0x89},
+ {0x3731, 0x00},
+ {0x3732, 0x08},
+ {0x3733, 0x01},
+ {0x3734, 0xfe},
+ {0x3735, 0x05},
+ {0x375d, 0x00},
+ {0x375e, 0x00},
+ {0x375f, 0x61},
+ {0x3760, 0x06},
+ {0x3768, 0x1b},
+ {0x3769, 0x1b},
+ {0x376a, 0x1a},
+ {0x376b, 0x19},
+ {0x376c, 0x18},
+ {0x376d, 0x14},
+ {0x376e, 0x0f},
+ {0x3776, 0x00},
+ {0x3777, 0x00},
+ {0x3778, 0x46},
+ {0x3779, 0x00},
+ {0x377a, 0x08},
+ {0x377b, 0x01},
+ {0x377c, 0x45},
+ {0x377d, 0x01},
+ {0x377e, 0x23},
+ {0x377f, 0x02},
+ {0x3780, 0xd9},
+ {0x3781, 0x03},
+ {0x3782, 0xf5},
+ {0x3783, 0x06},
+ {0x3784, 0xa5},
+ {0x3788, 0x0f},
+ {0x378a, 0xd9},
+ {0x378b, 0x03},
+ {0x378c, 0xeb},
+ {0x378d, 0x05},
+ {0x378e, 0x87},
+ {0x378f, 0x06},
+ {0x3790, 0xf5},
+ {0x3792, 0x43},
+ {0x3794, 0x7a},
+ {0x3796, 0xa1},
+ {0x3e04, 0x0e},
+ {0x3a00, 0x01},
+};
+
+/* Supported sensor mode configurations */
+static const struct imx334_mode supported_mode = {
+ .width = 3840,
+ .height = 2160,
+ .hblank = 560,
+ .vblank = 2340,
+ .vblank_min = 90,
+ .vblank_max = 132840,
+ .pclk = 594000000,
+ .link_freq_idx = 0,
+ .code = MEDIA_BUS_FMT_SRGGB12_1X12,
+ .reg_list = {
+ .num_of_regs = ARRAY_SIZE(mode_3840x2160_regs),
+ .regs = mode_3840x2160_regs,
+ },
+};
+
+/**
+ * to_imx334() - imv334 V4L2 sub-device to imx334 device.
+ * @subdev: pointer to imx334 V4L2 sub-device
+ *
+ * Return: pointer to imx334 device
+ */
+static inline struct imx334 *to_imx334(struct v4l2_subdev *subdev)
+{
+ return container_of(subdev, struct imx334, sd);
+}
+
+/**
+ * imx334_read_reg() - Read registers.
+ * @imx334: pointer to imx334 device
+ * @reg: register address
+ * @len: length of bytes to read. Max supported bytes is 4
+ * @val: pointer to register value to be filled.
+ *
+ * Big endian register addresses with little endian values.
+ *
+ * Return: 0 if successful, error code otherwise.
+ */
+static int imx334_read_reg(struct imx334 *imx334, u16 reg, u32 len, u32 *val)
+{
+ struct i2c_client *client = v4l2_get_subdevdata(&imx334->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;
+
+ ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
+ if (ret != ARRAY_SIZE(msgs))
+ return -EIO;
+
+ *val = get_unaligned_le32(data_buf);
+
+ return 0;
+}
+
+/**
+ * imx334_write_reg() - Write register
+ * @imx334: pointer to imx334 device
+ * @reg: register address
+ * @len: length of bytes. Max supported bytes is 4
+ * @val: register value
+ *
+ * Big endian register addresses with little endian values.
+ *
+ * Return: 0 if successful, error code otherwise.
+ */
+static int imx334_write_reg(struct imx334 *imx334, u16 reg, u32 len, u32 val)
+{
+ struct i2c_client *client = v4l2_get_subdevdata(&imx334->sd);
+ u8 buf[6] = {0};
+
+ if (WARN_ON(len > 4))
+ return -EINVAL;
+
+ put_unaligned_be16(reg, buf);
+ put_unaligned_le32(val, buf + 2);
+ if (i2c_master_send(client, buf, len + 2) != len + 2)
+ return -EIO;
+
+ return 0;
+}
+
+/**
+ * imx334_write_regs() - Write a list of registers
+ * @imx334: pointer to imx334 device
+ * @regs: list of registers to be written
+ * @len: length of registers array
+ *
+ * Return: 0 if successful, error code otherwise.
+ */
+static int imx334_write_regs(struct imx334 *imx334,
+ const struct imx334_reg *regs, u32 len)
+{
+ unsigned int i;
+ int ret;
+
+ for (i = 0; i < len; i++) {
+ ret = imx334_write_reg(imx334, regs[i].address, 1, regs[i].val);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+/**
+ * imx334_update_controls() - Update control ranges based on streaming mode
+ * @imx334: pointer to imx334 device
+ * @mode: pointer to imx334_mode sensor mode
+ *
+ * Return: 0 if successful, error code otherwise.
+ */
+static int imx334_update_controls(struct imx334 *imx334,
+ const struct imx334_mode *mode)
+{
+ int ret;
+
+ ret = __v4l2_ctrl_s_ctrl(imx334->link_freq_ctrl, mode->link_freq_idx);
+ if (ret)
+ return ret;
+
+ ret = __v4l2_ctrl_s_ctrl(imx334->hblank_ctrl, mode->hblank);
+ if (ret)
+ return ret;
+
+ return __v4l2_ctrl_modify_range(imx334->vblank_ctrl, mode->vblank_min,
+ mode->vblank_max, 1, mode->vblank);
+}
+
+/**
+ * imx334_update_exp_gain() - Set updated exposure and gain
+ * @imx334: pointer to imx334 device
+ * @exposure: updated exposure value
+ * @gain: updated analog gain value
+ *
+ * Return: 0 if successful, error code otherwise.
+ */
+static int imx334_update_exp_gain(struct imx334 *imx334, u32 exposure, u32 gain)
+{
+ u32 lpfr, shutter;
+ int ret;
+
+ lpfr = imx334->vblank + imx334->cur_mode->height;
+ shutter = lpfr - exposure;
+
+ dev_dbg(imx334->dev, "Set long exp %u analog gain %u sh0 %u lpfr %u",
+ exposure, gain, shutter, lpfr);
+
+ ret = imx334_write_reg(imx334, IMX334_REG_HOLD, 1, 1);
+ if (ret)
+ return ret;
+
+ ret = imx334_write_reg(imx334, IMX334_REG_LPFR, 3, lpfr);
+ if (ret)
+ goto error_release_group_hold;
+
+ ret = imx334_write_reg(imx334, IMX334_REG_SHUTTER, 3, shutter);
+ if (ret)
+ goto error_release_group_hold;
+
+ ret = imx334_write_reg(imx334, IMX334_REG_AGAIN, 1, gain);
+
+error_release_group_hold:
+ imx334_write_reg(imx334, IMX334_REG_HOLD, 1, 0);
+
+ return ret;
+}
+
+/**
+ * imx334_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 imx334_set_ctrl(struct v4l2_ctrl *ctrl)
+{
+ struct imx334 *imx334 =
+ container_of(ctrl->handler, struct imx334, ctrl_handler);
+ u32 analog_gain;
+ u32 exposure;
+ int ret;
+
+ switch (ctrl->id) {
+ case V4L2_CID_VBLANK:
+ imx334->vblank = imx334->vblank_ctrl->val;
+
+ dev_dbg(imx334->dev, "Received vblank %u, new lpfr %u",
+ imx334->vblank,
+ imx334->vblank + imx334->cur_mode->height);
+
+ ret = __v4l2_ctrl_modify_range(imx334->exp_ctrl,
+ IMX334_EXPOSURE_MIN,
+ imx334->vblank +
+ imx334->cur_mode->height -
+ IMX334_EXPOSURE_OFFSET,
+ 1, IMX334_EXPOSURE_DEFAULT);
+ break;
+ case V4L2_CID_EXPOSURE:
+
+ /* Set controls only if sensor is in power on state */
+ if (!pm_runtime_get_if_in_use(imx334->dev))
+ return 0;
+
+ exposure = ctrl->val;
+ analog_gain = imx334->again_ctrl->val;
+
+ dev_dbg(imx334->dev, "Received exp %u analog gain %u",
+ exposure, analog_gain);
+
+ ret = imx334_update_exp_gain(imx334, exposure, analog_gain);
+
+ pm_runtime_put(imx334->dev);
+
+ break;
+ default:
+ dev_err(imx334->dev, "Invalid control %d", ctrl->id);
+ ret = -EINVAL;
+ }
+
+ return ret;
+}
+
+/* V4l2 subdevice control ops*/
+static const struct v4l2_ctrl_ops imx334_ctrl_ops = {
+ .s_ctrl = imx334_set_ctrl,
+};
+
+/**
+ * imx334_enum_mbus_code() - Enumerate V4L2 sub-device mbus codes
+ * @sd: pointer to imx334 V4L2 sub-device structure
+ * @cfg: V4L2 sub-device pad configuration
+ * @code: V4L2 sub-device code enumeration need to be filled
+ *
+ * Return: 0 if successful, error code otherwise.
+ */
+static int imx334_enum_mbus_code(struct v4l2_subdev *sd,
+ struct v4l2_subdev_pad_config *cfg,
+ struct v4l2_subdev_mbus_code_enum *code)
+{
+ if (code->index > 0)
+ return -EINVAL;
+
+ code->code = supported_mode.code;
+
+ return 0;
+}
+
+/**
+ * imx334_enum_frame_size() - Enumerate V4L2 sub-device frame sizes
+ * @sd: pointer to imx334 V4L2 sub-device structure
+ * @cfg: V4L2 sub-device pad configuration
+ * @fsize: V4L2 sub-device size enumeration need to be filled
+ *
+ * Return: 0 if successful, error code otherwise.
+ */
+static int imx334_enum_frame_size(struct v4l2_subdev *sd,
+ struct v4l2_subdev_pad_config *cfg,
+ 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;
+}
+
+/**
+ * imx334_fill_pad_format() - Fill subdevice pad format
+ * from selected sensor mode
+ * @imx334: pointer to imx334 device
+ * @mode: pointer to imx334_mode sensor mode
+ * @fmt: V4L2 sub-device format need to be filled
+ */
+static void imx334_fill_pad_format(struct imx334 *imx334,
+ const struct imx334_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;
+}
+
+/**
+ * imx334_get_pad_format() - Get subdevice pad format
+ * @sd: pointer to imx334 V4L2 sub-device structure
+ * @cfg: V4L2 sub-device pad configuration
+ * @fmt: V4L2 sub-device format need to be set
+ *
+ * Return: 0 if successful, error code otherwise.
+ */
+static int imx334_get_pad_format(struct v4l2_subdev *sd,
+ struct v4l2_subdev_pad_config *cfg,
+ struct v4l2_subdev_format *fmt)
+{
+ struct imx334 *imx334 = to_imx334(sd);
+
+ mutex_lock(&imx334->mutex);
+
+ if (fmt->which == V4L2_SUBDEV_FORMAT_TRY) {
+ struct v4l2_mbus_framefmt *framefmt;
+
+ framefmt = v4l2_subdev_get_try_format(sd, cfg, fmt->pad);
+ fmt->format = *framefmt;
+ } else {
+ imx334_fill_pad_format(imx334, imx334->cur_mode, fmt);
+ }
+
+ mutex_unlock(&imx334->mutex);
+
+ return 0;
+}
+
+/**
+ * imx334_set_pad_format() - Set subdevice pad format
+ * @sd: pointer to imx334 V4L2 sub-device structure
+ * @cfg: V4L2 sub-device pad configuration
+ * @fmt: V4L2 sub-device format need to be set
+ *
+ * Return: 0 if successful, error code otherwise.
+ */
+static int imx334_set_pad_format(struct v4l2_subdev *sd,
+ struct v4l2_subdev_pad_config *cfg,
+ struct v4l2_subdev_format *fmt)
+{
+ struct imx334 *imx334 = to_imx334(sd);
+ const struct imx334_mode *mode;
+ int ret = 0;
+
+ mutex_lock(&imx334->mutex);
+
+ mode = &supported_mode;
+ imx334_fill_pad_format(imx334, mode, fmt);
+
+ if (fmt->which == V4L2_SUBDEV_FORMAT_TRY) {
+ struct v4l2_mbus_framefmt *framefmt;
+
+ framefmt = v4l2_subdev_get_try_format(sd, cfg, fmt->pad);
+ *framefmt = fmt->format;
+ } else {
+ ret = imx334_update_controls(imx334, mode);
+ if (!ret)
+ imx334->cur_mode = mode;
+ }
+
+ mutex_unlock(&imx334->mutex);
+
+ return ret;
+}
+
+/**
+ * imx334_init_pad_cfg() - Initialize sub-device pad configuration
+ * @sd: pointer to imx334 V4L2 sub-device structure
+ * @cfg: V4L2 sub-device pad configuration
+ *
+ * Return: 0 if successful, error code otherwise.
+ */
+static int imx334_init_pad_cfg(struct v4l2_subdev *sd,
+ struct v4l2_subdev_pad_config *cfg)
+{
+ struct imx334 *imx334 = to_imx334(sd);
+ struct v4l2_subdev_format fmt = { 0 };
+
+ fmt.which = cfg ? V4L2_SUBDEV_FORMAT_TRY : V4L2_SUBDEV_FORMAT_ACTIVE;
+ imx334_fill_pad_format(imx334, &supported_mode, &fmt);
+
+ return imx334_set_pad_format(sd, cfg, &fmt);
+}
+
+/**
+ * imx334_start_streaming() - Start sensor stream
+ * @imx334: pointer to imx334 device
+ *
+ * Return: 0 if successful, error code otherwise.
+ */
+static int imx334_start_streaming(struct imx334 *imx334)
+{
+ const struct imx334_reg_list *reg_list;
+ int ret;
+
+ /* Write sensor mode registers */
+ reg_list = &imx334->cur_mode->reg_list;
+ ret = imx334_write_regs(imx334, reg_list->regs,
+ reg_list->num_of_regs);
+ if (ret) {
+ dev_err(imx334->dev, "fail to write initial registers");
+ return ret;
+ }
+
+ /* Setup handler will write actual exposure and gain */
+ ret = __v4l2_ctrl_handler_setup(imx334->sd.ctrl_handler);
+ if (ret) {
+ dev_err(imx334->dev, "fail to setup handler");
+ return ret;
+ }
+
+ /* Start streaming */
+ ret = imx334_write_reg(imx334, IMX334_REG_MODE_SELECT,
+ 1, IMX334_MODE_STREAMING);
+ if (ret) {
+ dev_err(imx334->dev, "fail to start streaming");
+ return ret;
+ }
+
+ return 0;
+}
+
+/**
+ * imx334_stop_streaming() - Stop sensor stream
+ * @imx334: pointer to imx334 device
+ *
+ * Return: 0 if successful, error code otherwise.
+ */
+static int imx334_stop_streaming(struct imx334 *imx334)
+{
+ return imx334_write_reg(imx334, IMX334_REG_MODE_SELECT,
+ 1, IMX334_MODE_STANDBY);
+}
+
+/**
+ * imx334_set_stream() - Enable sensor streaming
+ * @sd: pointer to imx334 subdevice
+ * @enable: set to enable sensor streaming
+ *
+ * Return: 0 if successful, error code otherwise.
+ */
+static int imx334_set_stream(struct v4l2_subdev *sd, int enable)
+{
+ struct imx334 *imx334 = to_imx334(sd);
+ int ret;
+
+ mutex_lock(&imx334->mutex);
+
+ if (imx334->streaming == enable) {
+ mutex_unlock(&imx334->mutex);
+ return 0;
+ }
+
+ if (enable) {
+ ret = pm_runtime_get_sync(imx334->dev);
+ if (ret)
+ goto error_power_off;
+
+ ret = imx334_start_streaming(imx334);
+ if (ret)
+ goto error_power_off;
+ } else {
+ imx334_stop_streaming(imx334);
+ pm_runtime_put(imx334->dev);
+ }
+
+ imx334->streaming = enable;
+
+ mutex_unlock(&imx334->mutex);
+
+ return 0;
+
+error_power_off:
+ pm_runtime_put(imx334->dev);
+ mutex_unlock(&imx334->mutex);
+
+ return ret;
+}
+
+/**
+ * imx334_detect() - Detect imx334 sensor
+ * @imx334: pointer to imx334 device
+ *
+ * Return: 0 if successful, -EIO if sensor id does not match
+ */
+static int imx334_detect(struct imx334 *imx334)
+{
+ int ret;
+ u32 val;
+
+ ret = imx334_read_reg(imx334, IMX334_REG_ID, 2, &val);
+ if (ret)
+ return ret;
+
+ if (val != IMX334_ID) {
+ dev_err(imx334->dev, "chip id mismatch: %x!=%x",
+ IMX334_ID, val);
+ return -ENXIO;
+ }
+
+ return 0;
+}
+
+/**
+ * imx334_parse_hw_config() - Parse HW configuration and check if supported
+ * @imx334: pointer to imx334 device
+ *
+ * Return: 0 if successful, error code otherwise.
+ */
+static int imx334_parse_hw_config(struct imx334 *imx334)
+{
+ struct fwnode_handle *fwnode = dev_fwnode(imx334->dev);
+ struct v4l2_fwnode_endpoint bus_cfg = {
+ .bus_type = V4L2_MBUS_CSI2_DPHY
+ };
+ struct fwnode_handle *ep;
+ unsigned long rate;
+ int ret;
+ int i;
+
+ if (!fwnode)
+ return -ENXIO;
+
+ /* Request optional reset pin */
+ imx334->reset_gpio = devm_gpiod_get_optional(imx334->dev, "reset",
+ GPIOD_OUT_LOW);
+ if (IS_ERR(imx334->reset_gpio)) {
+ dev_err(imx334->dev, "failed to get reset gpio %d", ret);
+ return PTR_ERR(imx334->reset_gpio);
+ }
+
+ /* Get sensor input clock */
+ imx334->inclk = devm_clk_get(imx334->dev, NULL);
+ if (IS_ERR(imx334->inclk)) {
+ dev_err(imx334->dev, "could not get inclk");
+ return PTR_ERR(imx334->inclk);
+ }
+
+ rate = clk_get_rate(imx334->inclk);
+ if (rate != IMX334_INCLK_RATE) {
+ dev_err(imx334->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 != IMX334_NUM_DATA_LANES) {
+ dev_err(imx334->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(imx334->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] == IMX334_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 imx334_video_ops = {
+ .s_stream = imx334_set_stream,
+};
+
+static const struct v4l2_subdev_pad_ops imx334_pad_ops = {
+ .init_cfg = imx334_init_pad_cfg,
+ .enum_mbus_code = imx334_enum_mbus_code,
+ .enum_frame_size = imx334_enum_frame_size,
+ .get_fmt = imx334_get_pad_format,
+ .set_fmt = imx334_set_pad_format,
+};
+
+static const struct v4l2_subdev_ops imx334_subdev_ops = {
+ .video = &imx334_video_ops,
+ .pad = &imx334_pad_ops,
+};
+
+/**
+ * imx334_power_on() - Sensor power on sequence
+ * @dev: pointer to i2c device
+ *
+ * Return: 0 if successful, error code otherwise.
+ */
+static int imx334_power_on(struct device *dev)
+{
+ struct v4l2_subdev *sd = dev_get_drvdata(dev);
+ struct imx334 *imx334 = to_imx334(sd);
+ int ret;
+
+ gpiod_set_value_cansleep(imx334->reset_gpio, 1);
+
+ ret = clk_prepare_enable(imx334->inclk);
+ if (ret) {
+ dev_err(imx334->dev, "fail to enable inclk");
+ goto error_reset;
+ }
+
+ usleep_range(18000, 20000);
+
+ return 0;
+
+error_reset:
+ gpiod_set_value_cansleep(imx334->reset_gpio, 0);
+
+ return ret;
+}
+
+/**
+ * imx334_power_off() - Sensor power off sequence
+ * @dev: pointer to i2c device
+ *
+ * Return: 0 if successful, error code otherwise.
+ */
+static int imx334_power_off(struct device *dev)
+{
+ struct v4l2_subdev *sd = dev_get_drvdata(dev);
+ struct imx334 *imx334 = to_imx334(sd);
+
+ gpiod_set_value_cansleep(imx334->reset_gpio, 0);
+
+ clk_disable_unprepare(imx334->inclk);
+
+ return 0;
+}
+
+/**
+ * imx334_init_controls() - Initialize sensor subdevice controls
+ * @imx334: pointer to imx334 device
+ *
+ * Return: 0 if successful, error code otherwise.
+ */
+static int imx334_init_controls(struct imx334 *imx334)
+{
+ struct v4l2_ctrl_handler *ctrl_hdlr = &imx334->ctrl_handler;
+ const struct imx334_mode *mode = imx334->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 = &imx334->mutex;
+
+ /* Initialize exposure and gain */
+ lpfr = mode->vblank + mode->height;
+ imx334->exp_ctrl = v4l2_ctrl_new_std(ctrl_hdlr,
+ &imx334_ctrl_ops,
+ V4L2_CID_EXPOSURE,
+ IMX334_EXPOSURE_MIN,
+ lpfr - IMX334_EXPOSURE_OFFSET,
+ IMX334_EXPOSURE_STEP,
+ IMX334_EXPOSURE_DEFAULT);
+
+ imx334->again_ctrl = v4l2_ctrl_new_std(ctrl_hdlr,
+ &imx334_ctrl_ops,
+ V4L2_CID_ANALOGUE_GAIN,
+ IMX334_AGAIN_MIN,
+ IMX334_AGAIN_MAX,
+ IMX334_AGAIN_STEP,
+ IMX334_AGAIN_DEFAULT);
+
+ v4l2_ctrl_cluster(2, &imx334->exp_ctrl);
+
+ imx334->vblank_ctrl = v4l2_ctrl_new_std(ctrl_hdlr,
+ &imx334_ctrl_ops,
+ V4L2_CID_VBLANK,
+ mode->vblank_min,
+ mode->vblank_max,
+ 1, mode->vblank);
+
+ /* Read only controls */
+ imx334->pclk_ctrl = v4l2_ctrl_new_std(ctrl_hdlr,
+ &imx334_ctrl_ops,
+ V4L2_CID_PIXEL_RATE,
+ mode->pclk, mode->pclk,
+ 1, mode->pclk);
+
+ imx334->link_freq_ctrl = v4l2_ctrl_new_int_menu(ctrl_hdlr,
+ &imx334_ctrl_ops,
+ V4L2_CID_LINK_FREQ,
+ ARRAY_SIZE(link_freq) -
+ 1,
+ mode->link_freq_idx,
+ link_freq);
+ if (imx334->link_freq_ctrl)
+ imx334->link_freq_ctrl->flags |= V4L2_CTRL_FLAG_READ_ONLY;
+
+ imx334->hblank_ctrl = v4l2_ctrl_new_std(ctrl_hdlr,
+ &imx334_ctrl_ops,
+ V4L2_CID_HBLANK,
+ IMX334_REG_MIN,
+ IMX334_REG_MAX,
+ 1, mode->hblank);
+ if (imx334->hblank_ctrl)
+ imx334->hblank_ctrl->flags |= V4L2_CTRL_FLAG_READ_ONLY;
+
+ if (ctrl_hdlr->error) {
+ dev_err(imx334->dev, "control init failed: %d",
+ ctrl_hdlr->error);
+ v4l2_ctrl_handler_free(ctrl_hdlr);
+ return ctrl_hdlr->error;
+ }
+
+ imx334->sd.ctrl_handler = ctrl_hdlr;
+
+ return 0;
+}
+
+/**
+ * imx334_probe() - I2C client device binding
+ * @client: pointer to i2c client device
+ *
+ * Return: 0 if successful, error code otherwise.
+ */
+static int imx334_probe(struct i2c_client *client)
+{
+ struct imx334 *imx334;
+ int ret;
+
+ imx334 = devm_kzalloc(&client->dev, sizeof(*imx334), GFP_KERNEL);
+ if (!imx334)
+ return -ENOMEM;
+
+ imx334->dev = &client->dev;
+
+ /* Initialize subdev */
+ v4l2_i2c_subdev_init(&imx334->sd, client, &imx334_subdev_ops);
+
+ ret = imx334_parse_hw_config(imx334);
+ if (ret) {
+ dev_err(imx334->dev, "HW configuration is not supported");
+ return ret;
+ }
+
+ mutex_init(&imx334->mutex);
+
+ ret = imx334_power_on(imx334->dev);
+ if (ret) {
+ dev_err(imx334->dev, "failed to power-on the sensor");
+ goto error_mutex_destroy;
+ }
+
+ /* Check module identity */
+ ret = imx334_detect(imx334);
+ if (ret) {
+ dev_err(imx334->dev, "failed to find sensor: %d", ret);
+ goto error_power_off;
+ }
+
+ /* Set default mode to max resolution */
+ imx334->cur_mode = &supported_mode;
+ imx334->vblank = imx334->cur_mode->vblank;
+
+ ret = imx334_init_controls(imx334);
+ if (ret) {
+ dev_err(imx334->dev, "failed to init controls: %d", ret);
+ goto error_power_off;
+ }
+
+ /* Initialize subdev */
+ imx334->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
+ imx334->sd.entity.function = MEDIA_ENT_F_CAM_SENSOR;
+
+ /* Initialize source pad */
+ imx334->pad.flags = MEDIA_PAD_FL_SOURCE;
+ ret = media_entity_pads_init(&imx334->sd.entity, 1, &imx334->pad);
+ if (ret) {
+ dev_err(imx334->dev, "failed to init entity pads: %d", ret);
+ goto error_handler_free;
+ }
+
+ ret = v4l2_async_register_subdev_sensor_common(&imx334->sd);
+ if (ret < 0) {
+ dev_err(imx334->dev,
+ "failed to register async subdev: %d", ret);
+ goto error_media_entity;
+ }
+
+ pm_runtime_set_active(imx334->dev);
+ pm_runtime_enable(imx334->dev);
+ pm_runtime_idle(imx334->dev);
+
+ return 0;
+
+error_media_entity:
+ media_entity_cleanup(&imx334->sd.entity);
+error_handler_free:
+ v4l2_ctrl_handler_free(imx334->sd.ctrl_handler);
+error_power_off:
+ imx334_power_off(imx334->dev);
+error_mutex_destroy:
+ mutex_destroy(&imx334->mutex);
+
+ return ret;
+}
+
+/**
+ * imx334_remove() - I2C client device unbinding
+ * @client: pointer to I2C client device
+ *
+ * Return: 0 if successful, error code otherwise.
+ */
+static int imx334_remove(struct i2c_client *client)
+{
+ struct v4l2_subdev *sd = i2c_get_clientdata(client);
+ struct imx334 *imx334 = to_imx334(sd);
+
+ v4l2_async_unregister_subdev(sd);
+ media_entity_cleanup(&sd->entity);
+ v4l2_ctrl_handler_free(sd->ctrl_handler);
+
+ pm_runtime_disable(&client->dev);
+ pm_runtime_suspended(&client->dev);
+
+ mutex_destroy(&imx334->mutex);
+
+ return 0;
+}
+
+static const struct dev_pm_ops imx334_pm_ops = {
+ SET_RUNTIME_PM_OPS(imx334_power_off, imx334_power_on, NULL)
+};
+
+static const struct of_device_id imx334_of_match[] = {
+ { .compatible = "sony,imx334" },
+ { }
+};
+
+MODULE_DEVICE_TABLE(of, imx334_of_match);
+
+static struct i2c_driver imx334_driver = {
+ .probe_new = imx334_probe,
+ .remove = imx334_remove,
+ .driver = {
+ .name = "imx334",
+ .pm = &imx334_pm_ops,
+ .of_match_table = imx334_of_match,
+ },
+};
+
+module_i2c_driver(imx334_driver);
+
+MODULE_DESCRIPTION("Sony imx334 sensor driver");
+MODULE_LICENSE("GPL");
projects / linux.git / commitdiff