Fwd: [PATCH v7 2/3] media: i2c: Add Sony IMX681 sensor driver

From: Andre Gilerson

Date: Thu Oct 01 2026 - 01:30:37 EST

Hi everybody,

am not yet familiar with the entire etiquette on this mailing list, so
i hope i am not comitting any major faux pas here. Some input on the
open questions as well as a some incremental changes for v8:

- The regulator comment from an older bring-up. I did not see any
failures on the hardware and suggest keeping it as in v7.
- The gain split is a shortcut because the IPU7 HAL already limits
analogue sensitivity to 960 and separate DIGITAL_GAIN changes nothing.
- I think dropping the group hold is fine as Sakari requested.
- On the maintainers: As mentioned in the other mail I think we proper
way is to include both Sergey and me.
- I think keeping .set_fmt, and the comment above
pm_runtime_get_if_active()) is fine either way. The exposure default
is the same. The slow first start that German saw really needs the
libcamera sensor helper.

I tested v7 plus the change below on a Surface Pro 11 for Business,
running mainline 7.3-rc5 merged with media/next and libcamera 0.7.2:

- v4l2-compliance 1.32.0 on the sensor subdev: 46 tests, 46 succeeded,
0 failed, 0 warnings.
- cam captures 3844x2640 at 30.00 fps. qcam, with the CPU software
ISP, shows a correctly colored image once AE settles.
- All four HFLIP/VFLIP combinations give the right Bayer code, in both
enum_mbus_code and the stored format. Changing a flip while streaming
returns EBUSY.
- Runtime PM auto suspends after streaming stops. Unbind, bind and
capture again works.

One thing to know about. IPU7 ISYS logs "csi2-2 error: Received packet
is too long" once per frame while this sensor streams, but the frames
arrive correctly. I loaded my original downstream driver on the same
kernel to compare, and the count was the same. The flips make no
difference either. My guess is a packet from the sensor that the
receiver doesn't expect, possibly embedded data. I believe this does
not need to hold up the entire patch series, but will be continuing to
work on this in the meantime.

I suggest the following changes for v8:

> + imx681->xclk = devm_clk_get_optional(imx681->dev, NULL);

Could this use devm_v4l2_sensor_clk_get(), as most sensor drivers in
media/next do now, with the 19.2 MHz check made unconditional? The
INT3472 registers the clock through clkdev.

One smaller thing: the probe error path (error_pm) should also call
pm_runtime_dont_use_autosuspend(), to match remove().

The diff below, on top of v7 2/3, does both. It builds with W=1,
passes checkpatch --strict, and is what I tested above. Please fold it
into v8 if you agree.

Also since Sergey by now has contributed a lot of work is suggest the add

Co-developed-by: Sergey Lebedev <lsa.uz@xxxxx>

above the Signed-off-by on 2/3.

Best regards,
Andre

PS. sorry for the doubling the email, the first one was rejected due
to HTML formatting

diff --git a/drivers/media/i2c/imx681.c b/drivers/media/i2c/imx681.c
index fee409f8a536..06fdf1856aec 100644
--- a/drivers/media/i2c/imx681.c
+++ b/drivers/media/i2c/imx681.c
@@ -854,6 +854,7 @@ static int imx681_parse_endpoint(struct imx681 *imx681)
static int imx681_probe(struct i2c_client *client)
{
struct imx681 *imx681;
+ unsigned long xclk_freq;
int ret;

imx681 = devm_kzalloc(&client->dev, sizeof(*imx681), GFP_KERNEL);
@@ -871,27 +872,20 @@ static int imx681_probe(struct i2c_client *client)
return dev_err_probe(imx681->dev, PTR_ERR(imx681->cci),
"failed to init CCI\n");

- /* Get clock (optional - INT3472 provides it on Surface devices) */
- imx681->xclk = devm_clk_get_optional(imx681->dev, NULL);
+ imx681->xclk = devm_v4l2_sensor_clk_get(imx681->dev, NULL);
if (IS_ERR(imx681->xclk))
return dev_err_probe(imx681->dev, PTR_ERR(imx681->xclk),
"failed to get clock\n");

/*
* Both PLLs in imx681_init_regs[] and the value written to
- * EXTCLK_FREQUENCY_MHZ assume this rate, so a different one would
- * configure the part for a clock it is not being given. Where the
- * clock is not ours to see - INT3472 on this machine hands it over
- * outside the clk framework - there is nothing to check.
+ * EXTCLK_FREQUENCY_MHZ assume this rate.
*/
- if (imx681->xclk) {
- unsigned long rate = clk_get_rate(imx681->xclk);
-
- if (rate != IMX681_XCLK_FREQ)
- return dev_err_probe(imx681->dev, -EINVAL,
- "external clock is %lu Hz, this driver needs %u\n",
- rate, IMX681_XCLK_FREQ);
- }
+ xclk_freq = clk_get_rate(imx681->xclk);
+ if (xclk_freq != IMX681_XCLK_FREQ)
+ return dev_err_probe(imx681->dev, -EINVAL,
+ "external clock %lu Hz not supported, expected %u Hz\n",
+ xclk_freq, IMX681_XCLK_FREQ);

/* Get regulators */
for (unsigned int i = 0; i < ARRAY_SIZE(imx681_supply_names); i++)
@@ -977,6 +971,7 @@ static int imx681_probe(struct i2c_client *client)
error_handler_free:
v4l2_ctrl_handler_free(imx681->sd.ctrl_handler);
error_pm:
+ pm_runtime_dont_use_autosuspend(imx681->dev);
pm_runtime_disable(imx681->dev);
pm_runtime_set_suspended(imx681->dev);
error_power_off:

On Wed, 23 Sept 2026 at 23:18, Sergey Lebedev <lsa.uz@xxxxx> wrote:
>
> From: Andre Gilerson <andre.gilerson@xxxxxxxxx>
>
> Add a V4L2 sub-device driver for the Sony IMX681, a 10-bit Bayer sensor
> on a two-lane CSI-2 bus. It offers a single 3844x2640 mode at 30 fps and
> controls for exposure, analogue and digital gain, vertical blanking,
> both flips and the sensor's test patterns. The part is enumerated as
> ACPI device SONY0681 on Intel platforms and by the sony,imx681
> compatible elsewhere.
>
> There is no public documentation for this sensor. The initialisation
> sequence was recovered from I2C traces taken under Windows, so
> imx681_init_regs[] keeps the writes whose meaning is not known; the
> registers that are CCS are written by name instead. The pixel rate is
> measured on the part rather than computed from the CSI-2 link, because
> the pixel array is clocked from a second PLL - the comment above
> IMX681_PIXEL_RATE records the measurement.
>
> Signed-off-by: Andre Gilerson <andre.gilerson@xxxxxxxxx>
> Signed-off-by: Sergey Lebedev <lsa.uz@xxxxx>
> Tested-by: German Pablo Lindo <germanpapulindez@xxxxxxxxx>
> ---
> MAINTAINERS | 7 +
> drivers/media/i2c/Kconfig | 10 +
> drivers/media/i2c/Makefile | 1 +
> drivers/media/i2c/imx681.c | 1037 ++++++++++++++++++++++++++++++++++++
> 4 files changed, 1055 insertions(+)
> create mode 100644 drivers/media/i2c/imx681.c
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 4cc4a2dc6d3..4479f96d0d1 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -25609,6 +25609,13 @@ S: Maintained
> F: Documentation/devicetree/bindings/media/i2c/sony,imx678.yaml
> F: drivers/media/i2c/imx678.c
>
> +SONY IMX681 SENSOR DRIVER
> +M: Andre Gilerson <andre.gilerson@xxxxxxxxx>
> +L: linux-media@xxxxxxxxxxxxxxx
> +S: Maintained
> +F: Documentation/devicetree/bindings/media/i2c/sony,imx681.yaml
> +F: drivers/media/i2c/imx681.c
> +
> SONY MEMORYSTICK SUBSYSTEM
> M: Maxim Levitsky <maximlevitsky@xxxxxxxxx>
> M: Alex Dubov <oakad@xxxxxxxxx>
> diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
> index 4d994647916..c759a2d2398 100644
> --- a/drivers/media/i2c/Kconfig
> +++ b/drivers/media/i2c/Kconfig
> @@ -321,6 +321,16 @@ config VIDEO_IMX678
> To compile this driver as a module, choose M here: the
> module will be called imx678.
>
> +config VIDEO_IMX681
> + tristate "Sony IMX681 sensor support"
> + select V4L2_CCI_I2C
> + help
> + This is a Video4Linux2 sensor driver for the Sony
> + IMX681 camera.
> +
> + To compile this driver as a module, choose M here: the
> + module will be called imx681.
> +
> config VIDEO_MAX9271_LIB
> tristate
>
> diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile
> index fd1cb25718c..98bcecf0c43 100644
> --- a/drivers/media/i2c/Makefile
> +++ b/drivers/media/i2c/Makefile
> @@ -64,6 +64,7 @@ obj-$(CONFIG_VIDEO_IMX412) += imx412.o
> obj-$(CONFIG_VIDEO_IMX415) += imx415.o
> obj-$(CONFIG_VIDEO_IMX678) += imx678.o
> obj-$(CONFIG_VIDEO_IMX471) += imx471.o
> +obj-$(CONFIG_VIDEO_IMX681) += imx681.o
> obj-$(CONFIG_VIDEO_IR_I2C) += ir-kbd-i2c.o
> obj-$(CONFIG_VIDEO_ISL7998X) += isl7998x.o
> obj-$(CONFIG_VIDEO_IT6625) += it6625.o
> diff --git a/drivers/media/i2c/imx681.c b/drivers/media/i2c/imx681.c
> new file mode 100644
> index 00000000000..fee409f8a53
> --- /dev/null
> +++ b/drivers/media/i2c/imx681.c
> @@ -0,0 +1,1037 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Sony IMX681 CMOS Image Sensor Driver
> + *
> + * Front camera on Surface Pro 11 Business (Intel/Lunar Lake).
> + * Register sequences reverse-engineered from Windows I2C traces.
> + *
> + * Copyright (C) 2025
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/delay.h>
> +#include <linux/gpio/consumer.h>
> +#include <linux/i2c.h>
> +#include <linux/module.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/property.h>
> +#include <linux/regulator/consumer.h>
> +
> +#include <media/v4l2-cci.h>
> +#include <media/v4l2-ctrls.h>
> +#include <media/v4l2-device.h>
> +#include <media/v4l2-fwnode.h>
> +
> +/* Chip ID register and expected value */
> +#define IMX681_REG_CHIP_ID CCI_REG16(0x0016)
> +#define IMX681_CHIP_ID 0x0681
> +
> +/* Mode select */
> +#define IMX681_REG_MODE_SELECT CCI_REG8(0x0100)
> +#define IMX681_MODE_STANDBY 0x00
> +#define IMX681_MODE_STREAMING 0x01
> +
> +/* Exposure (coarse integration time, 24-bit) */
> +#define IMX681_REG_EXPOSURE CCI_REG24(0x0229)
> +/*
> + * The external clock frequency, in MHz, as a Q8.8 fixed-point number: the
> + * sensor takes 19.2 MHz as 19 in the high byte and 0.2 * 256 in the low one.
> + */
> +#define IMX681_XCLK_FREQ 19200000
> +#define IMX681_XCLK_FREQ_ENC ((IMX681_XCLK_FREQ / 1000000) << 8 | \
> + (IMX681_XCLK_FREQ % 1000000) * 256 / 1000000)
> +
> +#define IMX681_EXPOSURE_MIN 4
> +/* The exposure may not come within this many lines of the frame length. */
> +#define IMX681_EXPOSURE_MARGIN 4
> +#define IMX681_EXPOSURE_DEFAULT IMX681_EXPOSURE_MIN
> +
> +/* Analog gain */
> +#define IMX681_REG_ANALOG_GAIN CCI_REG16(0x0204)
> +#define IMX681_ANA_GAIN_MIN 0
> +#define IMX681_ANA_GAIN_MAX 960 /* 16x, where the analogue stage ends */
> +#define IMX681_ANA_GAIN_DEFAULT 0
> +
> +/* Digital gain */
> +#define IMX681_REG_DIGITAL_GAIN CCI_REG16(0x020E)
> +#define IMX681_DIG_GAIN_MIN 0x0100 /* 1.0x */
> +#define IMX681_DIG_GAIN_MAX 0x0FFF
> +#define IMX681_DIG_GAIN_DEFAULT 0x0100
> +
> +/* Test pattern, and the colour the solid-colour mode shows */
> +#define IMX681_REG_TEST_PATTERN CCI_REG16(0x0600)
> +#define IMX681_REG_TESTP_RED CCI_REG16(0x0602)
> +#define IMX681_REG_TESTP_GREENR CCI_REG16(0x0604)
> +#define IMX681_REG_TESTP_BLUE CCI_REG16(0x0606)
> +#define IMX681_REG_TESTP_GREENB CCI_REG16(0x0608)
> +#define IMX681_TESTP_COLOUR_MIN 0
> +#define IMX681_TESTP_COLOUR_MAX 0x03ff
> +#define IMX681_TESTP_COLOUR_STEP 1
> +
> +/*
> + * Frame length and exposure are 24-bit and at vendor addresses; everything
> + * else this driver touches is a CCS register at its CCS address, and is
> + * named for it here.
> + */
> +#define IMX681_REG_FRAME_LENGTH CCI_REG24(0x033D)
> +#define IMX681_REG_LINE_LENGTH CCI_REG16(0x0342)
> +#define IMX681_REG_ORIENTATION CCI_REG8(0x0101)
> +#define IMX681_REG_CSI_SIGNALING_MODE CCI_REG8(0x0111)
> +#define IMX681_REG_EXTCLK_FREQ_MHZ CCI_REG16(0x0136)
> +#define IMX681_REG_PLL_MULTIPLIER CCI_REG16(0x0306)
> +#define IMX681_REG_OP_PRE_PLL_CLK_DIV CCI_REG16(0x030c)
> +#define IMX681_REG_OP_PLL_MULTIPLIER CCI_REG16(0x030e)
> +#define IMX681_REG_X_ADDR_START CCI_REG16(0x0344)
> +#define IMX681_REG_Y_ADDR_START CCI_REG16(0x0346)
> +#define IMX681_REG_X_ADDR_END CCI_REG16(0x0348)
> +#define IMX681_REG_Y_ADDR_END CCI_REG16(0x034a)
> +#define IMX681_REG_X_OUTPUT_SIZE CCI_REG16(0x034c)
> +#define IMX681_REG_Y_OUTPUT_SIZE CCI_REG16(0x034e)
> +#define IMX681_REG_DIGITAL_CROP_WIDTH CCI_REG16(0x040c)
> +#define IMX681_REG_DIGITAL_CROP_HEIGHT CCI_REG16(0x040e)
> +
> +/* PLL, as the Windows traces configure it and the part reads back. */
> +#define IMX681_PLL_MULTIPLIER 225
> +#define IMX681_OP_PRE_PLL_CLK_DIV 3
> +#define IMX681_OP_PLL_MULTIPLIER 303
> +
> +/*
> + * Where the read-out window sits in the pixel array, and how much array
> + * there is. The bounds are the part's own answer: X_ADDR_MIN, X_ADDR_MAX,
> + * Y_ADDR_MIN and Y_ADDR_MAX at the CCS addresses read 8, 4039, 64 and 3087,
> + * so 4032x3024 of readable pixels at (8, 64), and the window below sits
> + * inside that. What lies beyond the readable area is not documented, so the
> + * native size is the smallest rectangle that contains it.
> + */
> +#define IMX681_CROP_X_START 100
> +#define IMX681_CROP_Y_START 256
> +#define IMX681_PIXEL_ARRAY_LEFT 8
> +#define IMX681_PIXEL_ARRAY_TOP 64
> +#define IMX681_PIXEL_ARRAY_WIDTH 4032
> +#define IMX681_PIXEL_ARRAY_HEIGHT 3024
> +#define IMX681_NATIVE_WIDTH 4040
> +#define IMX681_NATIVE_HEIGHT 3088
> +
> +/* Image dimensions — native sensor output */
> +#define IMX681_WIDTH 3844
> +#define IMX681_HEIGHT 2640
> +#define IMX681_LINE_LENGTH_PCK 7552 /* 0x1D80 */
> +#define IMX681_FRAME_LENGTH_LINES 3177 /* 0x0C69 */
> +#define IMX681_FRAME_LENGTH_MAX 0xFFFF /* 24-bit reg, limit to 16-bit */
> +
> +/* MIPI lanes */
> +#define IMX681_NUM_LANES 2
> +
> +/*
> + * Link frequency derived from PLL settings in Windows trace:
> + * EXCK=19.2MHz, PLL2_MUL=303, PLL2_PRE_DIV=3
> + * OP output = 19.2 * 303 / 3 = 1939.2 MHz (MIPI bit rate)
> + * Link freq = 1939.2 / 2 (DDR) = 969.6 MHz
> + */
> +#define IMX681_LINK_FREQ 969600000LL
> +
> +/*
> + * The pixel rate cannot be derived from the CSI-2 link: this part runs two
> + * PLLs, and the pixel array is clocked from the video-timing one while the
> + * link is clocked from the other. It cannot be derived from the video-timing
> + * PLL either, because these registers are at the CCS addresses without
> + * having the CCS meaning. Read back from the part at its operating point
> + * they are PRE_PLL_CLK_DIV 2 and PLL_MULTIPLIER 225, so a 2160 MHz VCO, then
> + * VT_SYS_CLK_DIV 2 and VT_PIX_CLK_DIV 6 - by the CCS formula 180 MHz, which
> + * would be 7.5 fps. The sensor runs at 30.
> + *
> + * So it is measured: LINE_LENGTH_PCK x FRAME_LENGTH_LINES x the frame rate
> + * the part achieves, which is 29.95 fps over 300 frames and 720 MHz.
> + */
> +#define IMX681_PIXEL_RATE 720000000LL
> +
> +/* Power-on delay after reset deassert */
> +#define IMX681_RESET_DELAY_US 1000
> +#define IMX681_RESET_DELAY_RANGE_US 1000
> +
> +/* Post-standby-cancel stabilisation delays */
> +#define IMX681_INIT_DELAY_US 10000
> +
> +#define IMAGE_PAD 0
> +
> +static const s64 imx681_link_frequencies[] = {
> + IMX681_LINK_FREQ,
> +};
> +
> +/*
> + * Sensor init register sequence, captured from Windows I2C traces.
> + * This configures the sensor for 3844x2640 RAW10 output at ~30fps
> + * with 2-lane MIPI CSI-2, 19.2MHz input clock.
> + */
> +static const struct cci_reg_sequence imx681_init_regs[] = {
> + { IMX681_REG_EXTCLK_FREQ_MHZ, IMX681_XCLK_FREQ_ENC },
> + /* Vendor specific configuration */
> + { CCI_REG16(0x002C), 0x0505 },
> + /* 0x02 is D-PHY, which is the only mode this part offers. */
> + { IMX681_REG_CSI_SIGNALING_MODE, 0x02 },
> + /* Vendor access unlock sequence */
> + { CCI_REG8(0x30EB), 0x05 },
> + { CCI_REG8(0x30EB), 0x0C },
> + /* Vendor specific */
> + { CCI_REG16(0x300A), 0xFFFF },
> + { CCI_REG16(0x3532), 0xFFFF },
> + /*
> + * The analogue crop, its digital counterpart and the output size, at
> + * the CCS addresses. The traces wrote these as overlapping partial
> + * writes - 0x0345 and 0x0349 carry only the low byte of a 16-bit
> + * register, so the window was right only while the high bytes held
> + * their reset values. Written whole here, and the values read back
> + * from the part at the operating point agree: the window is
> + * 3943 - 100 + 1 by 2895 - 256 + 1, which is the output size.
> + */
> + { IMX681_REG_X_ADDR_START, IMX681_CROP_X_START },
> + { IMX681_REG_Y_ADDR_START, IMX681_CROP_Y_START },
> + { IMX681_REG_X_ADDR_END, IMX681_CROP_X_START + IMX681_WIDTH - 1 },
> + { IMX681_REG_Y_ADDR_END, IMX681_CROP_Y_START + IMX681_HEIGHT - 1 },
> + { IMX681_REG_DIGITAL_CROP_WIDTH, IMX681_WIDTH },
> + { IMX681_REG_DIGITAL_CROP_HEIGHT, IMX681_HEIGHT },
> + { IMX681_REG_X_OUTPUT_SIZE, IMX681_WIDTH },
> + { IMX681_REG_Y_OUTPUT_SIZE, IMX681_HEIGHT },
> + /*
> + * Both of these were partial writes in the traces too: 0x0307 is the
> + * low byte of PLL_MULTIPLIER and 0x030d the low byte of
> + * OP_PRE_PLL_CLK_DIV, and each was right only while its high byte
> + * held the reset value. Written whole, and the part reads back
> + * 225, 3 and 303 at the operating point either way.
> + */
> + { IMX681_REG_PLL_MULTIPLIER, IMX681_PLL_MULTIPLIER },
> + { IMX681_REG_OP_PRE_PLL_CLK_DIV, IMX681_OP_PRE_PLL_CLK_DIV },
> + { IMX681_REG_OP_PLL_MULTIPLIER, IMX681_OP_PLL_MULTIPLIER },
> + /* Vendor specific registers */
> + { CCI_REG8(0x7E9B), 0x02 },
> + { CCI_REG8(0x0368), 0x00 },
> + { CCI_REG8(0xD383), 0x01 },
> +};
> +
> +/*
> + * The CCS numbering, which this part follows: 1 solid colour, 2 colour bars,
> + * 3 bars fading to grey. Mode 4, PN9, is not offered because it produces a
> + * black frame on this sensor where 2 and 3 produce their patterns, and
> + * TEST_PATTERN_CAPABILITY reads zero here so it cannot be asked.
> + */
> +static const char * const imx681_test_pattern_menu[] = {
> + "Disabled",
> + "Solid Colour",
> + "Eight Vertical Colour Bars",
> + "Colour Bars With Fade to Grey",
> +};
> +
> +/*
> + * The pixel array reads out RGGB. Mirroring moves the Bayer phase by one
> + * column and flipping by one row, so the code the sensor delivers follows
> + * the two controls: index = vflip << 1 | hflip.
> + */
> +static const u32 imx681_mbus_codes[] = {
> + MEDIA_BUS_FMT_SRGGB10_1X10,
> + MEDIA_BUS_FMT_SGRBG10_1X10,
> + MEDIA_BUS_FMT_SGBRG10_1X10,
> + MEDIA_BUS_FMT_SBGGR10_1X10,
> +};
> +
> +/* Regulator supplies */
> +static const char * const imx681_supply_names[] = {
> + "avdd", /* Analog 2.8V */
> + "dvdd", /* Digital 1.05V */
> + "dovdd", /* I/O 1.8V */
> +};
> +
> +struct imx681 {
> + struct device *dev;
> + struct regmap *cci;
> +
> + struct v4l2_subdev sd;
> + struct media_pad pad;
> +
> + struct clk *xclk;
> + struct gpio_desc *reset_gpio;
> + struct regulator_bulk_data supplies[ARRAY_SIZE(imx681_supply_names)];
> +
> + /* V4L2 Controls */
> + struct v4l2_ctrl_handler ctrl_handler;
> + struct v4l2_ctrl *exposure;
> + struct v4l2_ctrl *vblank;
> + struct v4l2_ctrl *hblank;
> + struct v4l2_ctrl *hflip;
> + struct v4l2_ctrl *vflip;
> +
> + unsigned long link_freq_bitmap;
> +};
> +
> +static inline struct imx681 *to_imx681(struct v4l2_subdev *sd)
> +{
> + return container_of_const(sd, struct imx681, sd);
> +}
> +
> +static int imx681_set_ctrl(struct v4l2_ctrl *ctrl)
> +{
> + struct imx681 *imx681 = container_of(ctrl->handler, struct imx681,
> + ctrl_handler);
> + s64 exposure_max;
> + int pm_status;
> + int ret = 0;
> +
> + /* Update exposure max when VBLANK changes (even when not streaming) */
> + if (ctrl->id == V4L2_CID_VBLANK) {
> + exposure_max = IMX681_HEIGHT + ctrl->val - IMX681_EXPOSURE_MARGIN;
> + ret = __v4l2_ctrl_modify_range(imx681->exposure,
> + IMX681_EXPOSURE_MIN, exposure_max,
> + 1, IMX681_EXPOSURE_DEFAULT);
> + if (ret)
> + return ret;
> + }
> +
> + /*
> + * 1 with a reference taken, 0 if the device is not active, or -EINVAL
> + * if runtime PM is unavailable. Only the 0 means there is nothing to
> + * do: without runtime PM the sensor is powered from probe and never
> + * suspended, so the write still has to go out - but no reference was
> + * taken then, and none may be dropped.
> + */
> + pm_status = pm_runtime_get_if_active(imx681->dev);
> + if (!pm_status)
> + return 0;
> +
> + switch (ctrl->id) {
> + case V4L2_CID_VBLANK:
> + ret = cci_write(imx681->cci, IMX681_REG_FRAME_LENGTH,
> + IMX681_HEIGHT + ctrl->val, NULL);
> + break;
> +
> + case V4L2_CID_EXPOSURE:
> + ret = cci_write(imx681->cci, IMX681_REG_EXPOSURE, ctrl->val,
> + NULL);
> + break;
> +
> + case V4L2_CID_ANALOGUE_GAIN:
> + /* Gain formula: gain = 1024/(1024-code); code 960 is 16x. */
> + ret = cci_write(imx681->cci, IMX681_REG_ANALOG_GAIN, ctrl->val,
> + NULL);
> + break;
> +
> + case V4L2_CID_DIGITAL_GAIN:
> + ret = cci_write(imx681->cci, IMX681_REG_DIGITAL_GAIN, ctrl->val,
> + NULL);
> + break;
> +
> + case V4L2_CID_HFLIP:
> + case V4L2_CID_VFLIP:
> + /*
> + * Read from imx681_start_streaming(). These are grabbed while
> + * streaming, so this runs only when the part is idle and the
> + * value is applied at the next stream start.
> + */
> + break;
> +
> + case V4L2_CID_TEST_PATTERN:
> + ret = cci_write(imx681->cci, IMX681_REG_TEST_PATTERN,
> + ctrl->val, NULL);
> + break;
> +
> + case V4L2_CID_TEST_PATTERN_RED:
> + ret = cci_write(imx681->cci, IMX681_REG_TESTP_RED, ctrl->val,
> + NULL);
> + break;
> +
> + case V4L2_CID_TEST_PATTERN_GREENR:
> + ret = cci_write(imx681->cci, IMX681_REG_TESTP_GREENR,
> + ctrl->val, NULL);
> + break;
> +
> + case V4L2_CID_TEST_PATTERN_BLUE:
> + ret = cci_write(imx681->cci, IMX681_REG_TESTP_BLUE, ctrl->val,
> + NULL);
> + break;
> +
> + case V4L2_CID_TEST_PATTERN_GREENB:
> + ret = cci_write(imx681->cci, IMX681_REG_TESTP_GREENB,
> + ctrl->val, NULL);
> + break;
> +
> + default:
> + break;
> + }
> +
> + if (pm_status > 0)
> + pm_runtime_put(imx681->dev);
> +
> + return ret;
> +}
> +
> +static const struct v4l2_ctrl_ops imx681_ctrl_ops = {
> + .s_ctrl = imx681_set_ctrl,
> +};
> +
> +static u32 imx681_get_format_code(struct imx681 *imx681)
> +{
> + return imx681_mbus_codes[(imx681->vflip->val ? 2 : 0) |
> + (imx681->hflip->val ? 1 : 0)];
> +}
> +
> +static int imx681_enum_mbus_code(struct v4l2_subdev *sd,
> + struct v4l2_subdev_state *state,
> + struct v4l2_subdev_mbus_code_enum *code)
> +{
> + struct imx681 *imx681 = to_imx681(sd);
> +
> + if (code->index > 0)
> + return -EINVAL;
> +
> + code->code = imx681_get_format_code(imx681);
> +
> + return 0;
> +}
> +
> +static bool imx681_is_valid_mbus_code(struct imx681 *imx681, u32 code)
> +{
> + return code == imx681_get_format_code(imx681);
> +}
> +
> +static int imx681_enum_frame_size(struct v4l2_subdev *sd,
> + struct v4l2_subdev_state *state,
> + struct v4l2_subdev_frame_size_enum *fse)
> +{
> + if (fse->index > 0)
> + return -EINVAL;
> +
> + if (!imx681_is_valid_mbus_code(to_imx681(sd), fse->code))
> + return -EINVAL;
> +
> + fse->min_width = IMX681_WIDTH;
> + fse->max_width = IMX681_WIDTH;
> + fse->min_height = IMX681_HEIGHT;
> + fse->max_height = IMX681_HEIGHT;
> +
> + return 0;
> +}
> +
> +static int imx681_init_state(struct v4l2_subdev *sd,
> + struct v4l2_subdev_state *state)
> +{
> + struct v4l2_mbus_framefmt *format;
> +
> + format = v4l2_subdev_state_get_format(state, IMAGE_PAD);
> + format->width = IMX681_WIDTH;
> + format->height = IMX681_HEIGHT;
> + format->code = imx681_get_format_code(to_imx681(sd));
> + format->field = V4L2_FIELD_NONE;
> + format->colorspace = V4L2_COLORSPACE_RAW;
> + format->ycbcr_enc = V4L2_YCBCR_ENC_601;
> + format->quantization = V4L2_QUANTIZATION_FULL_RANGE;
> + format->xfer_func = V4L2_XFER_FUNC_NONE;
> +
> + return 0;
> +}
> +
> +/*
> + * There is nothing to configure on the part here - the size is fixed and the
> + * code follows the flips - but the stored format still has to be told which
> + * Bayer order the flips have produced, or the pipeline validates the state
> + * against a code the sensor is no longer delivering.
> + */
> +static int imx681_set_pad_format(struct v4l2_subdev *sd,
> + const struct v4l2_subdev_client_info *ci,
> + struct v4l2_subdev_state *state,
> + struct v4l2_subdev_format *fmt)
> +{
> + struct imx681 *imx681 = to_imx681(sd);
> + struct v4l2_mbus_framefmt *format;
> +
> + fmt->format.width = IMX681_WIDTH;
> + fmt->format.height = IMX681_HEIGHT;
> + fmt->format.code = imx681_get_format_code(imx681);
> + fmt->format.field = V4L2_FIELD_NONE;
> + fmt->format.colorspace = V4L2_COLORSPACE_RAW;
> + fmt->format.ycbcr_enc = V4L2_YCBCR_ENC_601;
> + fmt->format.quantization = V4L2_QUANTIZATION_FULL_RANGE;
> + fmt->format.xfer_func = V4L2_XFER_FUNC_NONE;
> +
> + format = v4l2_subdev_state_get_format(state, fmt->pad);
> + *format = fmt->format;
> +
> + return 0;
> +}
> +
> +static int imx681_get_selection(struct v4l2_subdev *sd,
> + const struct v4l2_subdev_client_info *ci,
> + struct v4l2_subdev_state *state,
> + struct v4l2_subdev_selection *sel)
> +{
> + switch (sel->target) {
> + case V4L2_SEL_TGT_CROP:
> + case V4L2_SEL_TGT_CROP_DEFAULT:
> + sel->r.left = IMX681_CROP_X_START;
> + sel->r.top = IMX681_CROP_Y_START;
> + sel->r.width = IMX681_WIDTH;
> + sel->r.height = IMX681_HEIGHT;
> + return 0;
> + case V4L2_SEL_TGT_CROP_BOUNDS:
> + sel->r.left = IMX681_PIXEL_ARRAY_LEFT;
> + sel->r.top = IMX681_PIXEL_ARRAY_TOP;
> + sel->r.width = IMX681_PIXEL_ARRAY_WIDTH;
> + sel->r.height = IMX681_PIXEL_ARRAY_HEIGHT;
> + return 0;
> + case V4L2_SEL_TGT_NATIVE_SIZE:
> + sel->r.left = 0;
> + sel->r.top = 0;
> + sel->r.width = IMX681_NATIVE_WIDTH;
> + sel->r.height = IMX681_NATIVE_HEIGHT;
> + return 0;
> + default:
> + return -EINVAL;
> + }
> +}
> +
> +static int imx681_start_streaming(struct imx681 *imx681)
> +{
> + int ret;
> +
> + /*
> + * The orientation goes in before the register list, because the crop
> + * window in it is interpreted in the orientation then in force. The
> + * downstream driver had this write inside the list, ahead of the crop
> + * registers, for the same reason.
> + */
> + ret = cci_write(imx681->cci, IMX681_REG_ORIENTATION,
> + imx681->hflip->val | imx681->vflip->val << 1, NULL);
> + if (ret)
> + return ret;
> +
> + ret = cci_multi_reg_write(imx681->cci, imx681_init_regs,
> + ARRAY_SIZE(imx681_init_regs), NULL);
> + if (ret) {
> + dev_err(imx681->dev, "failed to write init regs: %d\n", ret);
> + return ret;
> + }
> +
> + /* Wait for sensor to stabilise after configuration */
> + usleep_range(IMX681_INIT_DELAY_US, IMX681_INIT_DELAY_US + 1000);
> +
> + /*
> + * The blanking is the controls' to set, not the register list's:
> + * HBLANK gives the line length, and VBLANK the frame length through
> + * imx681_set_ctrl() below, along with the exposure and the gains.
> + */
> + ret = cci_write(imx681->cci, IMX681_REG_LINE_LENGTH,
> + IMX681_WIDTH + imx681->hblank->val, NULL);
> + if (ret)
> + return ret;
> +
> + ret = __v4l2_ctrl_handler_setup(imx681->sd.ctrl_handler);
> + if (ret) {
> + dev_err(imx681->dev, "failed to apply controls: %d\n", ret);
> + return ret;
> + }
> +
> + /* Start streaming */
> + ret = cci_write(imx681->cci, IMX681_REG_MODE_SELECT,
> + IMX681_MODE_STREAMING, NULL);
> + if (ret) {
> + dev_err(imx681->dev, "failed to start streaming: %d\n", ret);
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +static int imx681_stop_streaming(struct imx681 *imx681)
> +{
> + int ret;
> +
> + ret = cci_write(imx681->cci, IMX681_REG_MODE_SELECT,
> + IMX681_MODE_STANDBY, NULL);
> + if (ret)
> + dev_err(imx681->dev, "failed to stop streaming: %d\n", ret);
> +
> + return ret;
> +}
> +
> +static int imx681_enable_streams(struct v4l2_subdev *sd,
> + struct v4l2_subdev_state *state,
> + u32 pad, u64 streams_mask)
> +{
> + struct imx681 *imx681 = to_imx681(sd);
> + int ret;
> +
> + ret = pm_runtime_resume_and_get(imx681->dev);
> + if (ret)
> + return ret;
> +
> + ret = imx681_start_streaming(imx681);
> + if (ret) {
> + pm_runtime_put_autosuspend(imx681->dev);
> + return ret;
> + }
> +
> + /*
> + * The flips are read once, in imx681_start_streaming(), and they
> + * choose the media bus code. Accepting a change now would report
> + * success, leave the part as it is and leave the stored format
> + * naming a code the sensor is no longer delivering.
> + */
> + __v4l2_ctrl_grab(imx681->hflip, true);
> + __v4l2_ctrl_grab(imx681->vflip, true);
> +
> + return 0;
> +}
> +
> +static int imx681_disable_streams(struct v4l2_subdev *sd,
> + struct v4l2_subdev_state *state,
> + u32 pad, u64 streams_mask)
> +{
> + struct imx681 *imx681 = to_imx681(sd);
> + int ret;
> +
> + __v4l2_ctrl_grab(imx681->hflip, false);
> + __v4l2_ctrl_grab(imx681->vflip, false);
> +
> + ret = imx681_stop_streaming(imx681);
> +
> + /* The reference goes back whether or not the part acknowledged. */
> + pm_runtime_put_autosuspend(imx681->dev);
> +
> + return ret;
> +}
> +
> +static const struct v4l2_subdev_video_ops imx681_video_ops = {
> + .s_stream = v4l2_subdev_s_stream_helper,
> +};
> +
> +static const struct v4l2_subdev_pad_ops imx681_pad_ops = {
> + .enum_mbus_code = imx681_enum_mbus_code,
> + .get_fmt = v4l2_subdev_get_fmt,
> + .set_fmt = imx681_set_pad_format,
> + .get_selection = imx681_get_selection,
> + .enum_frame_size = imx681_enum_frame_size,
> + .enable_streams = imx681_enable_streams,
> + .disable_streams = imx681_disable_streams,
> +};
> +
> +static const struct v4l2_subdev_ops imx681_subdev_ops = {
> + .video = &imx681_video_ops,
> + .pad = &imx681_pad_ops,
> +};
> +
> +static const struct v4l2_subdev_internal_ops imx681_internal_ops = {
> + .init_state = imx681_init_state,
> +};
> +
> +/* Power management */
> +static int imx681_power_on(struct device *dev)
> +{
> + struct v4l2_subdev *sd = dev_get_drvdata(dev);
> + struct imx681 *imx681 = to_imx681(sd);
> + int ret;
> +
> + ret = regulator_bulk_enable(ARRAY_SIZE(imx681_supply_names), imx681->supplies);
> + if (ret) {
> + dev_err(imx681->dev, "failed to enable regulators: %d\n", ret);
> + return ret;
> + }
> +
> + ret = clk_prepare_enable(imx681->xclk);
> + if (ret) {
> + dev_err(imx681->dev, "failed to enable clock: %d\n", ret);
> + goto err_reg_disable;
> + }
> +
> + /* Deassert reset (active low) */
> + gpiod_set_value_cansleep(imx681->reset_gpio, 0);
> +
> + usleep_range(IMX681_RESET_DELAY_US,
> + IMX681_RESET_DELAY_US + IMX681_RESET_DELAY_RANGE_US);
> +
> + return 0;
> +
> +err_reg_disable:
> + regulator_bulk_disable(ARRAY_SIZE(imx681_supply_names), imx681->supplies);
> +
> + return ret;
> +}
> +
> +static int imx681_power_off(struct device *dev)
> +{
> + struct v4l2_subdev *sd = dev_get_drvdata(dev);
> + struct imx681 *imx681 = to_imx681(sd);
> +
> + /* Assert reset */
> + gpiod_set_value_cansleep(imx681->reset_gpio, 1);
> + clk_disable_unprepare(imx681->xclk);
> + regulator_bulk_disable(ARRAY_SIZE(imx681_supply_names), imx681->supplies);
> +
> + return 0;
> +}
> +
> +static int imx681_identify_module(struct imx681 *imx681)
> +{
> + u64 val;
> + int ret;
> +
> + ret = cci_read(imx681->cci, IMX681_REG_CHIP_ID, &val, NULL);
> + if (ret)
> + return dev_err_probe(imx681->dev, ret,
> + "failed to read chip ID register 0x0016\n");
> +
> + if (val != IMX681_CHIP_ID) {
> + return dev_err_probe(imx681->dev, -EIO,
> + "chip ID mismatch: 0x%04llx != 0x%04x\n",
> + val, IMX681_CHIP_ID);
> + }
> +
> + return 0;
> +}
> +
> +static int imx681_init_controls(struct imx681 *imx681)
> +{
> + struct v4l2_ctrl_handler *ctrl_hdlr = &imx681->ctrl_handler;
> + struct v4l2_fwnode_device_properties props;
> + struct v4l2_ctrl *link_freq;
> + s64 hblank, vblank;
> + int ret;
> +
> + ret = v4l2_fwnode_device_parse(imx681->dev, &props);
> + if (ret)
> + return ret;
> +
> + ret = v4l2_ctrl_handler_init(ctrl_hdlr, 16);
> + if (ret)
> + return ret;
> +
> + /* Pixel rate (read-only) */
> + v4l2_ctrl_new_std(ctrl_hdlr, &imx681_ctrl_ops,
> + V4L2_CID_PIXEL_RATE, IMX681_PIXEL_RATE,
> + IMX681_PIXEL_RATE, 1, IMX681_PIXEL_RATE);
> +
> + /* Link frequency (read-only) */
> + link_freq = v4l2_ctrl_new_int_menu(ctrl_hdlr, &imx681_ctrl_ops,
> + V4L2_CID_LINK_FREQ,
> + __fls(imx681->link_freq_bitmap),
> + __ffs(imx681->link_freq_bitmap),
> + imx681_link_frequencies);
> + if (link_freq)
> + link_freq->flags |= V4L2_CTRL_FLAG_READ_ONLY;
> +
> + /* Horizontal blanking (read-only, fixed) */
> + hblank = IMX681_LINE_LENGTH_PCK - IMX681_WIDTH;
> + imx681->hblank = v4l2_ctrl_new_std(ctrl_hdlr, &imx681_ctrl_ops,
> + V4L2_CID_HBLANK, hblank, hblank,
> + 1, hblank);
> + if (imx681->hblank)
> + imx681->hblank->flags |= V4L2_CTRL_FLAG_READ_ONLY;
> +
> + /* Vertical blanking (writable to allow longer exposures) */
> + vblank = IMX681_FRAME_LENGTH_LINES - IMX681_HEIGHT;
> + imx681->vblank = v4l2_ctrl_new_std(ctrl_hdlr, &imx681_ctrl_ops,
> + V4L2_CID_VBLANK, vblank,
> + IMX681_FRAME_LENGTH_MAX - IMX681_HEIGHT,
> + 1, vblank);
> +
> + /* Exposure */
> + imx681->exposure = v4l2_ctrl_new_std(ctrl_hdlr, &imx681_ctrl_ops,
> + V4L2_CID_EXPOSURE,
> + IMX681_EXPOSURE_MIN,
> + IMX681_FRAME_LENGTH_LINES -
> + IMX681_EXPOSURE_MARGIN, 1,
> + IMX681_EXPOSURE_DEFAULT);
> +
> + /*
> + * Both flips move the Bayer phase, so the media bus code changes with
> + * them and the layout flag has to say so.
> + */
> + imx681->hflip = v4l2_ctrl_new_std(ctrl_hdlr, &imx681_ctrl_ops,
> + V4L2_CID_HFLIP, 0, 1, 1, 0);
> + imx681->vflip = v4l2_ctrl_new_std(ctrl_hdlr, &imx681_ctrl_ops,
> + V4L2_CID_VFLIP, 0, 1, 1, 0);
> + if (imx681->hflip)
> + imx681->hflip->flags |= V4L2_CTRL_FLAG_MODIFY_LAYOUT;
> + if (imx681->vflip)
> + imx681->vflip->flags |= V4L2_CTRL_FLAG_MODIFY_LAYOUT;
> +
> + /* Analog gain */
> + v4l2_ctrl_new_std(ctrl_hdlr, &imx681_ctrl_ops, V4L2_CID_ANALOGUE_GAIN,
> + IMX681_ANA_GAIN_MIN, IMX681_ANA_GAIN_MAX, 1,
> + IMX681_ANA_GAIN_DEFAULT);
> +
> + /* Digital gain */
> + v4l2_ctrl_new_std(ctrl_hdlr, &imx681_ctrl_ops, V4L2_CID_DIGITAL_GAIN,
> + IMX681_DIG_GAIN_MIN, IMX681_DIG_GAIN_MAX, 1,
> + IMX681_DIG_GAIN_DEFAULT);
> +
> + /* Test pattern */
> + v4l2_ctrl_new_std_menu_items(ctrl_hdlr, &imx681_ctrl_ops,
> + V4L2_CID_TEST_PATTERN,
> + ARRAY_SIZE(imx681_test_pattern_menu) - 1,
> + 0, 0, imx681_test_pattern_menu);
> +
> + /*
> + * The solid-colour mode shows whatever is in these, and they reset to
> + * zero - so without them the mode this driver advertises can only
> + * ever produce a black frame. Default to white, as imx219 does.
> + */
> + v4l2_ctrl_new_std(ctrl_hdlr, &imx681_ctrl_ops,
> + V4L2_CID_TEST_PATTERN_RED, IMX681_TESTP_COLOUR_MIN,
> + IMX681_TESTP_COLOUR_MAX, IMX681_TESTP_COLOUR_STEP,
> + IMX681_TESTP_COLOUR_MAX);
> + v4l2_ctrl_new_std(ctrl_hdlr, &imx681_ctrl_ops,
> + V4L2_CID_TEST_PATTERN_GREENR, IMX681_TESTP_COLOUR_MIN,
> + IMX681_TESTP_COLOUR_MAX, IMX681_TESTP_COLOUR_STEP,
> + IMX681_TESTP_COLOUR_MAX);
> + v4l2_ctrl_new_std(ctrl_hdlr, &imx681_ctrl_ops,
> + V4L2_CID_TEST_PATTERN_BLUE, IMX681_TESTP_COLOUR_MIN,
> + IMX681_TESTP_COLOUR_MAX, IMX681_TESTP_COLOUR_STEP,
> + IMX681_TESTP_COLOUR_MAX);
> + v4l2_ctrl_new_std(ctrl_hdlr, &imx681_ctrl_ops,
> + V4L2_CID_TEST_PATTERN_GREENB, IMX681_TESTP_COLOUR_MIN,
> + IMX681_TESTP_COLOUR_MAX, IMX681_TESTP_COLOUR_STEP,
> + IMX681_TESTP_COLOUR_MAX);
> +
> + if (ctrl_hdlr->error) {
> + ret = dev_err_probe(imx681->dev, ctrl_hdlr->error,
> + "control init failed\n");
> + goto error;
> + }
> +
> + ret = v4l2_ctrl_new_fwnode_properties(ctrl_hdlr, &imx681_ctrl_ops,
> + &props);
> + if (ret)
> + goto error;
> +
> + imx681->sd.ctrl_handler = ctrl_hdlr;
> +
> + return 0;
> +
> +error:
> + v4l2_ctrl_handler_free(ctrl_hdlr);
> +
> + return ret;
> +}
> +
> +static int imx681_parse_endpoint(struct imx681 *imx681)
> +{
> + struct fwnode_handle *fwnode = dev_fwnode(imx681->dev);
> + struct v4l2_fwnode_endpoint bus_cfg = {
> + .bus_type = V4L2_MBUS_CSI2_DPHY,
> + };
> + struct fwnode_handle *ep;
> + int ret;
> +
> + ep = fwnode_graph_get_endpoint_by_id(fwnode, 0, 0, 0);
> +
> + ret = v4l2_fwnode_endpoint_alloc_parse(ep, &bus_cfg);
> + fwnode_handle_put(ep);
> + if (ret)
> + return dev_err_probe(imx681->dev, ret,
> + "failed to parse endpoint\n");
> +
> + if (bus_cfg.bus.mipi_csi2.num_data_lanes != IMX681_NUM_LANES) {
> + ret = dev_err_probe(imx681->dev, -EINVAL,
> + "expected %d data lanes, got %d\n",
> + IMX681_NUM_LANES,
> + bus_cfg.bus.mipi_csi2.num_data_lanes);
> + goto done;
> + }
> +
> + ret = v4l2_link_freq_to_bitmap(imx681->dev,
> + bus_cfg.link_frequencies,
> + bus_cfg.nr_of_link_frequencies,
> + imx681_link_frequencies,
> + ARRAY_SIZE(imx681_link_frequencies),
> + &imx681->link_freq_bitmap);
> + if (ret)
> + ret = dev_err_probe(imx681->dev, ret,
> + "link frequency mismatch\n");
> +
> +done:
> + v4l2_fwnode_endpoint_free(&bus_cfg);
> +
> + return ret;
> +}
> +
> +static int imx681_probe(struct i2c_client *client)
> +{
> + struct imx681 *imx681;
> + int ret;
> +
> + imx681 = devm_kzalloc(&client->dev, sizeof(*imx681), GFP_KERNEL);
> + if (!imx681)
> + return -ENOMEM;
> +
> + imx681->dev = &client->dev;
> +
> + /* Initialise V4L2 subdev */
> + v4l2_i2c_subdev_init(&imx681->sd, client, &imx681_subdev_ops);
> +
> + /* Initialise CCI regmap for 16-bit register addresses */
> + imx681->cci = devm_cci_regmap_init_i2c(client, 16);
> + if (IS_ERR(imx681->cci))
> + return dev_err_probe(imx681->dev, PTR_ERR(imx681->cci),
> + "failed to init CCI\n");
> +
> + /* Get clock (optional - INT3472 provides it on Surface devices) */
> + imx681->xclk = devm_clk_get_optional(imx681->dev, NULL);
> + if (IS_ERR(imx681->xclk))
> + return dev_err_probe(imx681->dev, PTR_ERR(imx681->xclk),
> + "failed to get clock\n");
> +
> + /*
> + * Both PLLs in imx681_init_regs[] and the value written to
> + * EXTCLK_FREQUENCY_MHZ assume this rate, so a different one would
> + * configure the part for a clock it is not being given. Where the
> + * clock is not ours to see - INT3472 on this machine hands it over
> + * outside the clk framework - there is nothing to check.
> + */
> + if (imx681->xclk) {
> + unsigned long rate = clk_get_rate(imx681->xclk);
> +
> + if (rate != IMX681_XCLK_FREQ)
> + return dev_err_probe(imx681->dev, -EINVAL,
> + "external clock is %lu Hz, this driver needs %u\n",
> + rate, IMX681_XCLK_FREQ);
> + }
> +
> + /* Get regulators */
> + for (unsigned int i = 0; i < ARRAY_SIZE(imx681_supply_names); i++)
> + imx681->supplies[i].supply = imx681_supply_names[i];
> +
> + ret = devm_regulator_bulk_get(imx681->dev, ARRAY_SIZE(imx681_supply_names),
> + imx681->supplies);
> + if (ret)
> + return dev_err_probe(imx681->dev, ret,
> + "failed to get regulators\n");
> +
> + /* Get reset GPIO (optional) */
> + imx681->reset_gpio = devm_gpiod_get_optional(imx681->dev, "reset",
> + GPIOD_OUT_HIGH);
> + if (IS_ERR(imx681->reset_gpio))
> + return dev_err_probe(imx681->dev,
> + PTR_ERR(imx681->reset_gpio),
> + "failed to get reset GPIO\n");
> +
> + /* Parse CSI-2 endpoint */
> + ret = imx681_parse_endpoint(imx681);
> + if (ret)
> + return dev_err_probe(imx681->dev, ret,
> + "endpoint parse failed\n");
> +
> + /* Power on and verify chip ID */
> + ret = imx681_power_on(imx681->dev);
> + if (ret)
> + return dev_err_probe(imx681->dev, ret, "power on failed\n");
> +
> + ret = imx681_identify_module(imx681);
> + if (ret)
> + goto error_power_off;
> +
> + /* Enable runtime PM */
> + pm_runtime_set_active(imx681->dev);
> + pm_runtime_enable(imx681->dev);
> + pm_runtime_set_autosuspend_delay(imx681->dev, 1000);
> + pm_runtime_use_autosuspend(imx681->dev);
> +
> + /* Init V4L2 controls */
> + ret = imx681_init_controls(imx681);
> + if (ret)
> + goto error_pm;
> +
> + /* Setup subdev */
> + imx681->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
> + imx681->sd.entity.function = MEDIA_ENT_F_CAM_SENSOR;
> + imx681->sd.internal_ops = &imx681_internal_ops;
> +
> + /* Init media entity */
> + imx681->pad.flags = MEDIA_PAD_FL_SOURCE;
> + ret = media_entity_pads_init(&imx681->sd.entity, 1, &imx681->pad);
> + if (ret) {
> + ret = dev_err_probe(imx681->dev, ret,
> + "media entity init failed\n");
> + goto error_handler_free;
> + }
> +
> + imx681->sd.state_lock = imx681->ctrl_handler.lock;
> + ret = v4l2_subdev_init_finalize(&imx681->sd);
> + if (ret < 0) {
> + ret = dev_err_probe(imx681->dev, ret,
> + "subdev init finalize failed\n");
> + goto error_media_entity;
> + }
> +
> + ret = v4l2_async_register_subdev_sensor(&imx681->sd);
> + if (ret < 0) {
> + ret = dev_err_probe(imx681->dev, ret,
> + "async register subdev failed\n");
> + goto error_subdev_cleanup;
> + }
> +
> + pm_runtime_idle(imx681->dev);
> +
> + return 0;
> +
> +error_subdev_cleanup:
> + v4l2_subdev_cleanup(&imx681->sd);
> +error_media_entity:
> + media_entity_cleanup(&imx681->sd.entity);
> +error_handler_free:
> + v4l2_ctrl_handler_free(imx681->sd.ctrl_handler);
> +error_pm:
> + pm_runtime_disable(imx681->dev);
> + pm_runtime_set_suspended(imx681->dev);
> +error_power_off:
> + imx681_power_off(imx681->dev);
> +
> + return ret;
> +}
> +
> +static void imx681_remove(struct i2c_client *client)
> +{
> + struct v4l2_subdev *sd = i2c_get_clientdata(client);
> + struct imx681 *imx681 = to_imx681(sd);
> +
> + v4l2_async_unregister_subdev(sd);
> + v4l2_subdev_cleanup(&imx681->sd);
> + media_entity_cleanup(&sd->entity);
> + v4l2_ctrl_handler_free(imx681->sd.ctrl_handler);
> +
> + pm_runtime_disable(imx681->dev);
> + if (!pm_runtime_status_suspended(imx681->dev)) {
> + imx681_power_off(imx681->dev);
> + pm_runtime_set_suspended(imx681->dev);
> + }
> + pm_runtime_dont_use_autosuspend(imx681->dev);
> +}
> +
> +static DEFINE_RUNTIME_DEV_PM_OPS(imx681_pm_ops, imx681_power_off,
> + imx681_power_on, NULL);
> +
> +#ifdef CONFIG_ACPI
> +static const struct acpi_device_id imx681_acpi_ids[] = {
> + { "SONY0681" },
> + { /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(acpi, imx681_acpi_ids);
> +#endif
> +
> +static const struct of_device_id imx681_dt_ids[] = {
> + { .compatible = "sony,imx681" },
> + { /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(of, imx681_dt_ids);
> +
> +static struct i2c_driver imx681_i2c_driver = {
> + .driver = {
> + .name = "imx681",
> + .pm = pm_ptr(&imx681_pm_ops),
> + .acpi_match_table = ACPI_PTR(imx681_acpi_ids),
> + .of_match_table = imx681_dt_ids,
> + },
> + .probe = imx681_probe,
> + .remove = imx681_remove,
> +};
> +module_i2c_driver(imx681_i2c_driver);
> +
> +MODULE_DESCRIPTION("Sony IMX681 CMOS Image Sensor Driver");
> +MODULE_AUTHOR("Andre Gilerson <andre.gilerson@xxxxxxxxx>");
> +MODULE_LICENSE("GPL");
> --
> 2.54.0 (Apple Git-157)
>
>