From: Martina Krasteva <martinax.krasteva@xxxxxxxxx>
Add a v4l2 sub-device driver for the OmniVisison ov9282
black&white image sensor.
The camera sensor uses the i2c bus for control and the
csi-2 bus for data.
The following features are supported:
- manual exposure and analog gain control support
- vblank/hblank/pixel rate/link freq control support
- supported resolution:
- 1280x720 @ 30fps
Signed-off-by: Martina Krasteva <martinax.krasteva@xxxxxxxxx>
Acked-by: Daniele Alessandrelli <daniele.alessandrelli@xxxxxxxxx>
Acked-by: Paul J. Murphy <paul.j.murphy@xxxxxxxxx>
---
MAINTAINERS | 1 +
drivers/media/i2c/Kconfig | 14 +
drivers/media/i2c/Makefile | 1 +
drivers/media/i2c/ov9282.c | 1137 ++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 1153 insertions(+)
create mode 100644 drivers/media/i2c/ov9282.c
diff --git a/MAINTAINERS b/MAINTAINERS
index c0fa97f8755e..fe5adf830370 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -13657,6 +13657,7 @@ L: linux-media@xxxxxxxxxxxxxxx
S: Maintained
T: git git://linuxtv.org/media_tree.git
F: Documentation/devicetree/bindings/media/i2c/ovti,ov9282.yaml
+F: drivers/media/i2c/ov9282.c
OMNIVISION OV9640 SENSOR DRIVER
M: Petr Cvek <petrcvekcz@xxxxxxxxx>
diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
index 3ba1abbf0fd1..06f0531e2119 100644
--- a/drivers/media/i2c/Kconfig
+++ b/drivers/media/i2c/Kconfig
@@ -1116,6 +1116,20 @@ config VIDEO_OV8865
To compile this driver as a module, choose M here: the
module will be called ov8865.
+config VIDEO_OV9282
+ tristate "OmniVision OV9282 sensor support"
+ depends on OF_GPIO
+ depends on I2C && VIDEO_V4L2
+ select VIDEO_V4L2_SUBDEV_API
+ select MEDIA_CONTROLLER
+ select V4L2_FWNODE
+ help
+ This is a Video4Linux2 sensor driver for the OmniVision
+ OV9282 camera sensor.
+
+ To compile this driver as a module, choose M here: the
+ module will be called ov9282.
+
config VIDEO_OV9640
tristate "OmniVision OV9640 sensor support"
depends on I2C && VIDEO_V4L2
diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile
index 0556447c1089..2d43f0352605 100644
--- a/drivers/media/i2c/Makefile
+++ b/drivers/media/i2c/Makefile
@@ -84,6 +84,7 @@ obj-$(CONFIG_VIDEO_OV772X) += ov772x.o
obj-$(CONFIG_VIDEO_OV7740) += ov7740.o
obj-$(CONFIG_VIDEO_OV8856) += ov8856.o
obj-$(CONFIG_VIDEO_OV8865) += ov8865.o
+obj-$(CONFIG_VIDEO_OV9282) += ov9282.o
obj-$(CONFIG_VIDEO_OV9640) += ov9640.o
obj-$(CONFIG_VIDEO_OV9650) += ov9650.o
obj-$(CONFIG_VIDEO_OV9734) += ov9734.o
diff --git a/drivers/media/i2c/ov9282.c b/drivers/media/i2c/ov9282.c
new file mode 100644
index 000000000000..743db6e64944
--- /dev/null
+++ b/drivers/media/i2c/ov9282.c
@@ -0,0 +1,1137 @@
+// 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
+ * @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 ov9282_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;
+}
+
+/**
+ * ov9282_enum_frame_size() - Enumerate V4L2 sub-device frame sizes
+ * @sd: pointer to ov9282 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 ov9282_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;
+}
+
+/**
+ * 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
+ * @cfg: V4L2 sub-device pad 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_pad_config *cfg,
+ 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, cfg, 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
+ * @cfg: V4L2 sub-device pad 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_pad_config *cfg,
+ 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, cfg, 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
+ * @cfg: V4L2 sub-device pad configuration
+ *
+ * Return: 0 if successful, error code otherwise.
+ */
+static int ov9282_init_pad_cfg(struct v4l2_subdev *sd,
+ struct v4l2_subdev_pad_config *cfg)
+{
+ struct ov9282 *ov9282 = to_ov9282(sd);
+ struct v4l2_subdev_format fmt = { 0 };
+
+ fmt.which = cfg ? V4L2_SUBDEV_FORMAT_TRY : V4L2_SUBDEV_FORMAT_ACTIVE;
+ ov9282_fill_pad_format(ov9282, &supported_mode, &fmt);
+
+ return ov9282_set_pad_format(sd, cfg, &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 int 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);
+
+ return 0;
+}
+
+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");
--
2.11.0
