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linuxdebug/drivers/media/i2c/ov9282.c

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null pointer error
2024-07-16 15:50:57 +02:00
// 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");