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linux/drivers/media/i2c/imx274.c
Mauro Carvalho Chehab c0decac19d media: use strscpy() instead of strlcpy() 
The implementation of strscpy() is more robust and safer.

That's now the recommended way to copy NUL terminated strings.

Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
2018-09-11 13:32:17 -04:00

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/*
* imx274.c - IMX274 CMOS Image Sensor driver
*
* Copyright (C) 2017, Leopard Imaging, Inc.
*
* Leon Luo <leonl@leopardimaging.com>
* Edwin Zou <edwinz@leopardimaging.com>
* Luca Ceresoli <luca@lucaceresoli.net>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/gpio.h>
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of_gpio.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#include <linux/v4l2-mediabus.h>
#include <linux/videodev2.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-device.h>
#include <media/v4l2-subdev.h>
/*
* See "SHR, SVR Setting" in datasheet
*/
#define IMX274_DEFAULT_FRAME_LENGTH (4550)
#define IMX274_MAX_FRAME_LENGTH (0x000fffff)
/*
* See "Frame Rate Adjustment" in datasheet
*/
#define IMX274_PIXCLK_CONST1 (72000000)
#define IMX274_PIXCLK_CONST2 (1000000)
/*
* The input gain is shifted by IMX274_GAIN_SHIFT to get
* decimal number. The real gain is
* (float)input_gain_value / (1 << IMX274_GAIN_SHIFT)
*/
#define IMX274_GAIN_SHIFT (8)
#define IMX274_GAIN_SHIFT_MASK ((1 << IMX274_GAIN_SHIFT) - 1)
/*
* See "Analog Gain" and "Digital Gain" in datasheet
* min gain is 1X
* max gain is calculated based on IMX274_GAIN_REG_MAX
*/
#define IMX274_GAIN_REG_MAX (1957)
#define IMX274_MIN_GAIN (0x01 << IMX274_GAIN_SHIFT)
#define IMX274_MAX_ANALOG_GAIN ((2048 << IMX274_GAIN_SHIFT)\
/ (2048 - IMX274_GAIN_REG_MAX))
#define IMX274_MAX_DIGITAL_GAIN (8)
#define IMX274_DEF_GAIN (20 << IMX274_GAIN_SHIFT)
#define IMX274_GAIN_CONST (2048) /* for gain formula */
/*
* 1 line time in us = (HMAX / 72), minimal is 4 lines
*/
#define IMX274_MIN_EXPOSURE_TIME (4 * 260 / 72)
#define IMX274_DEFAULT_MODE IMX274_BINNING_OFF
#define IMX274_MAX_WIDTH (3840)
#define IMX274_MAX_HEIGHT (2160)
#define IMX274_MAX_FRAME_RATE (120)
#define IMX274_MIN_FRAME_RATE (5)
#define IMX274_DEF_FRAME_RATE (60)
/*
* register SHR is limited to (SVR value + 1) x VMAX value - 4
*/
#define IMX274_SHR_LIMIT_CONST (4)
/*
* Min and max sensor reset delay (microseconds)
*/
#define IMX274_RESET_DELAY1 (2000)
#define IMX274_RESET_DELAY2 (2200)
/*
* shift and mask constants
*/
#define IMX274_SHIFT_8_BITS (8)
#define IMX274_SHIFT_16_BITS (16)
#define IMX274_MASK_LSB_2_BITS (0x03)
#define IMX274_MASK_LSB_3_BITS (0x07)
#define IMX274_MASK_LSB_4_BITS (0x0f)
#define IMX274_MASK_LSB_8_BITS (0x00ff)
#define DRIVER_NAME "IMX274"
/*
* IMX274 register definitions
*/
#define IMX274_SHR_REG_MSB 0x300D /* SHR */
#define IMX274_SHR_REG_LSB 0x300C /* SHR */
#define IMX274_SVR_REG_MSB 0x300F /* SVR */
#define IMX274_SVR_REG_LSB 0x300E /* SVR */
#define IMX274_HTRIM_EN_REG 0x3037
#define IMX274_HTRIM_START_REG_LSB 0x3038
#define IMX274_HTRIM_START_REG_MSB 0x3039
#define IMX274_HTRIM_END_REG_LSB 0x303A
#define IMX274_HTRIM_END_REG_MSB 0x303B
#define IMX274_VWIDCUTEN_REG 0x30DD
#define IMX274_VWIDCUT_REG_LSB 0x30DE
#define IMX274_VWIDCUT_REG_MSB 0x30DF
#define IMX274_VWINPOS_REG_LSB 0x30E0
#define IMX274_VWINPOS_REG_MSB 0x30E1
#define IMX274_WRITE_VSIZE_REG_LSB 0x3130
#define IMX274_WRITE_VSIZE_REG_MSB 0x3131
#define IMX274_Y_OUT_SIZE_REG_LSB 0x3132
#define IMX274_Y_OUT_SIZE_REG_MSB 0x3133
#define IMX274_VMAX_REG_1 0x30FA /* VMAX, MSB */
#define IMX274_VMAX_REG_2 0x30F9 /* VMAX */
#define IMX274_VMAX_REG_3 0x30F8 /* VMAX, LSB */
#define IMX274_HMAX_REG_MSB 0x30F7 /* HMAX */
#define IMX274_HMAX_REG_LSB 0x30F6 /* HMAX */
#define IMX274_ANALOG_GAIN_ADDR_LSB 0x300A /* ANALOG GAIN LSB */
#define IMX274_ANALOG_GAIN_ADDR_MSB 0x300B /* ANALOG GAIN MSB */
#define IMX274_DIGITAL_GAIN_REG 0x3012 /* Digital Gain */
#define IMX274_VFLIP_REG 0x301A /* VERTICAL FLIP */
#define IMX274_TEST_PATTERN_REG 0x303D /* TEST PATTERN */
#define IMX274_STANDBY_REG 0x3000 /* STANDBY */
#define IMX274_TABLE_WAIT_MS 0
#define IMX274_TABLE_END 1
/*
* imx274 I2C operation related structure
*/
struct reg_8 {
u16 addr;
u8 val;
};
static const struct regmap_config imx274_regmap_config = {
.reg_bits = 16,
.val_bits = 8,
.cache_type = REGCACHE_RBTREE,
};
enum imx274_binning {
IMX274_BINNING_OFF,
IMX274_BINNING_2_1,
IMX274_BINNING_3_1,
};
/*
* Parameters for each imx274 readout mode.
*
* These are the values to configure the sensor in one of the
* implemented modes.
*
* @init_regs: registers to initialize the mode
* @bin_ratio: downscale factor (e.g. 3 for 3:1 binning)
* @min_frame_len: Minimum frame length for each mode (see "Frame Rate
* Adjustment (CSI-2)" in the datasheet)
* @min_SHR: Minimum SHR register value (see "Shutter Setting (CSI-2)" in the
* datasheet)
* @max_fps: Maximum frames per second
* @nocpiop: Number of clocks per internal offset period (see "Integration Time
* in Each Readout Drive Mode (CSI-2)" in the datasheet)
*/
struct imx274_frmfmt {
const struct reg_8 *init_regs;
unsigned int bin_ratio;
int min_frame_len;
int min_SHR;
int max_fps;
int nocpiop;
};
/*
* imx274 test pattern related structure
*/
enum {
TEST_PATTERN_DISABLED = 0,
TEST_PATTERN_ALL_000H,
TEST_PATTERN_ALL_FFFH,
TEST_PATTERN_ALL_555H,
TEST_PATTERN_ALL_AAAH,
TEST_PATTERN_VSP_5AH, /* VERTICAL STRIPE PATTERN 555H/AAAH */
TEST_PATTERN_VSP_A5H, /* VERTICAL STRIPE PATTERN AAAH/555H */
TEST_PATTERN_VSP_05H, /* VERTICAL STRIPE PATTERN 000H/555H */
TEST_PATTERN_VSP_50H, /* VERTICAL STRIPE PATTERN 555H/000H */
TEST_PATTERN_VSP_0FH, /* VERTICAL STRIPE PATTERN 000H/FFFH */
TEST_PATTERN_VSP_F0H, /* VERTICAL STRIPE PATTERN FFFH/000H */
TEST_PATTERN_H_COLOR_BARS,
TEST_PATTERN_V_COLOR_BARS,
};
static const char * const tp_qmenu[] = {
"Disabled",
"All 000h Pattern",
"All FFFh Pattern",
"All 555h Pattern",
"All AAAh Pattern",
"Vertical Stripe (555h / AAAh)",
"Vertical Stripe (AAAh / 555h)",
"Vertical Stripe (000h / 555h)",
"Vertical Stripe (555h / 000h)",
"Vertical Stripe (000h / FFFh)",
"Vertical Stripe (FFFh / 000h)",
"Horizontal Color Bars",
"Vertical Color Bars",
};
/*
* All-pixel scan mode (10-bit)
* imx274 mode1(refer to datasheet) register configuration with
* 3840x2160 resolution, raw10 data and mipi four lane output
*/
static const struct reg_8 imx274_mode1_3840x2160_raw10[] = {
{0x3004, 0x01},
{0x3005, 0x01},
{0x3006, 0x00},
{0x3007, 0xa2},
{0x3018, 0xA2}, /* output XVS, HVS */
{0x306B, 0x05},
{0x30E2, 0x01},
{0x30EE, 0x01},
{0x3342, 0x0A},
{0x3343, 0x00},
{0x3344, 0x16},
{0x3345, 0x00},
{0x33A6, 0x01},
{0x3528, 0x0E},
{0x3554, 0x1F},
{0x3555, 0x01},
{0x3556, 0x01},
{0x3557, 0x01},
{0x3558, 0x01},
{0x3559, 0x00},
{0x355A, 0x00},
{0x35BA, 0x0E},
{0x366A, 0x1B},
{0x366B, 0x1A},
{0x366C, 0x19},
{0x366D, 0x17},
{0x3A41, 0x08},
{IMX274_TABLE_END, 0x00}
};
/*
* Horizontal/vertical 2/2-line binning
* (Horizontal and vertical weightedbinning, 10-bit)
* imx274 mode3(refer to datasheet) register configuration with
* 1920x1080 resolution, raw10 data and mipi four lane output
*/
static const struct reg_8 imx274_mode3_1920x1080_raw10[] = {
{0x3004, 0x02},
{0x3005, 0x21},
{0x3006, 0x00},
{0x3007, 0xb1},
{0x3018, 0xA2}, /* output XVS, HVS */
{0x306B, 0x05},
{0x30E2, 0x02},
{0x30EE, 0x01},
{0x3342, 0x0A},
{0x3343, 0x00},
{0x3344, 0x1A},
{0x3345, 0x00},
{0x33A6, 0x01},
{0x3528, 0x0E},
{0x3554, 0x00},
{0x3555, 0x01},
{0x3556, 0x01},
{0x3557, 0x01},
{0x3558, 0x01},
{0x3559, 0x00},
{0x355A, 0x00},
{0x35BA, 0x0E},
{0x366A, 0x1B},
{0x366B, 0x1A},
{0x366C, 0x19},
{0x366D, 0x17},
{0x3A41, 0x08},
{IMX274_TABLE_END, 0x00}
};
/*
* Vertical 2/3 subsampling binning horizontal 3 binning
* imx274 mode5(refer to datasheet) register configuration with
* 1280x720 resolution, raw10 data and mipi four lane output
*/
static const struct reg_8 imx274_mode5_1280x720_raw10[] = {
{0x3004, 0x03},
{0x3005, 0x31},
{0x3006, 0x00},
{0x3007, 0xa9},
{0x3018, 0xA2}, /* output XVS, HVS */
{0x306B, 0x05},
{0x30E2, 0x03},
{0x30EE, 0x01},
{0x3342, 0x0A},
{0x3343, 0x00},
{0x3344, 0x1B},
{0x3345, 0x00},
{0x33A6, 0x01},
{0x3528, 0x0E},
{0x3554, 0x00},
{0x3555, 0x01},
{0x3556, 0x01},
{0x3557, 0x01},
{0x3558, 0x01},
{0x3559, 0x00},
{0x355A, 0x00},
{0x35BA, 0x0E},
{0x366A, 0x1B},
{0x366B, 0x19},
{0x366C, 0x17},
{0x366D, 0x17},
{0x3A41, 0x04},
{IMX274_TABLE_END, 0x00}
};
/*
* imx274 first step register configuration for
* starting stream
*/
static const struct reg_8 imx274_start_1[] = {
{IMX274_STANDBY_REG, 0x12},
{IMX274_TABLE_END, 0x00}
};
/*
* imx274 second step register configuration for
* starting stream
*/
static const struct reg_8 imx274_start_2[] = {
{0x3120, 0xF0}, /* clock settings */
{0x3121, 0x00}, /* clock settings */
{0x3122, 0x02}, /* clock settings */
{0x3129, 0x9C}, /* clock settings */
{0x312A, 0x02}, /* clock settings */
{0x312D, 0x02}, /* clock settings */
{0x310B, 0x00},
/* PLSTMG */
{0x304C, 0x00}, /* PLSTMG01 */
{0x304D, 0x03},
{0x331C, 0x1A},
{0x331D, 0x00},
{0x3502, 0x02},
{0x3529, 0x0E},
{0x352A, 0x0E},
{0x352B, 0x0E},
{0x3538, 0x0E},
{0x3539, 0x0E},
{0x3553, 0x00},
{0x357D, 0x05},
{0x357F, 0x05},
{0x3581, 0x04},
{0x3583, 0x76},
{0x3587, 0x01},
{0x35BB, 0x0E},
{0x35BC, 0x0E},
{0x35BD, 0x0E},
{0x35BE, 0x0E},
{0x35BF, 0x0E},
{0x366E, 0x00},
{0x366F, 0x00},
{0x3670, 0x00},
{0x3671, 0x00},
/* PSMIPI */
{0x3304, 0x32}, /* PSMIPI1 */
{0x3305, 0x00},
{0x3306, 0x32},
{0x3307, 0x00},
{0x3590, 0x32},
{0x3591, 0x00},
{0x3686, 0x32},
{0x3687, 0x00},
{IMX274_TABLE_END, 0x00}
};
/*
* imx274 third step register configuration for
* starting stream
*/
static const struct reg_8 imx274_start_3[] = {
{IMX274_STANDBY_REG, 0x00},
{0x303E, 0x02}, /* SYS_MODE = 2 */
{IMX274_TABLE_END, 0x00}
};
/*
* imx274 forth step register configuration for
* starting stream
*/
static const struct reg_8 imx274_start_4[] = {
{0x30F4, 0x00},
{0x3018, 0xA2}, /* XHS VHS OUTUPT */
{IMX274_TABLE_END, 0x00}
};
/*
* imx274 register configuration for stoping stream
*/
static const struct reg_8 imx274_stop[] = {
{IMX274_STANDBY_REG, 0x01},
{IMX274_TABLE_END, 0x00}
};
/*
* imx274 disable test pattern register configuration
*/
static const struct reg_8 imx274_tp_disabled[] = {
{0x303C, 0x00},
{0x377F, 0x00},
{0x3781, 0x00},
{0x370B, 0x00},
{IMX274_TABLE_END, 0x00}
};
/*
* imx274 test pattern register configuration
* reg 0x303D defines the test pattern modes
*/
static const struct reg_8 imx274_tp_regs[] = {
{0x303C, 0x11},
{0x370E, 0x01},
{0x377F, 0x01},
{0x3781, 0x01},
{0x370B, 0x11},
{IMX274_TABLE_END, 0x00}
};
/* nocpiop happens to be the same number for the implemented modes */
static const struct imx274_frmfmt imx274_formats[] = {
{
/* mode 1, 4K */
.bin_ratio = 1,
.init_regs = imx274_mode1_3840x2160_raw10,
.min_frame_len = 4550,
.min_SHR = 12,
.max_fps = 60,
.nocpiop = 112,
},
{
/* mode 3, 1080p */
.bin_ratio = 2,
.init_regs = imx274_mode3_1920x1080_raw10,
.min_frame_len = 2310,
.min_SHR = 8,
.max_fps = 120,
.nocpiop = 112,
},
{
/* mode 5, 720p */
.bin_ratio = 3,
.init_regs = imx274_mode5_1280x720_raw10,
.min_frame_len = 2310,
.min_SHR = 8,
.max_fps = 120,
.nocpiop = 112,
},
};
/*
* struct imx274_ctrls - imx274 ctrl structure
* @handler: V4L2 ctrl handler structure
* @exposure: Pointer to expsure ctrl structure
* @gain: Pointer to gain ctrl structure
* @vflip: Pointer to vflip ctrl structure
* @test_pattern: Pointer to test pattern ctrl structure
*/
struct imx274_ctrls {
struct v4l2_ctrl_handler handler;
struct v4l2_ctrl *exposure;
struct v4l2_ctrl *gain;
struct v4l2_ctrl *vflip;
struct v4l2_ctrl *test_pattern;
};
/*
* struct stim274 - imx274 device structure
* @sd: V4L2 subdevice structure
* @pad: Media pad structure
* @client: Pointer to I2C client
* @ctrls: imx274 control structure
* @crop: rect to be captured
* @compose: compose rect, i.e. output resolution
* @format: V4L2 media bus frame format structure
* (width and height are in sync with the compose rect)
* @frame_rate: V4L2 frame rate structure
* @regmap: Pointer to regmap structure
* @reset_gpio: Pointer to reset gpio
* @lock: Mutex structure
* @mode: Parameters for the selected readout mode
*/
struct stimx274 {
struct v4l2_subdev sd;
struct media_pad pad;
struct i2c_client *client;
struct imx274_ctrls ctrls;
struct v4l2_rect crop;
struct v4l2_mbus_framefmt format;
struct v4l2_fract frame_interval;
struct regmap *regmap;
struct gpio_desc *reset_gpio;
struct mutex lock; /* mutex lock for operations */
const struct imx274_frmfmt *mode;
};
#define IMX274_ROUND(dim, step, flags) \
((flags) & V4L2_SEL_FLAG_GE \
? roundup((dim), (step)) \
: ((flags) & V4L2_SEL_FLAG_LE \
? rounddown((dim), (step)) \
: rounddown((dim) + (step) / 2, (step))))
/*
* Function declaration
*/
static int imx274_set_gain(struct stimx274 *priv, struct v4l2_ctrl *ctrl);
static int imx274_set_exposure(struct stimx274 *priv, int val);
static int imx274_set_vflip(struct stimx274 *priv, int val);
static int imx274_set_test_pattern(struct stimx274 *priv, int val);
static int imx274_set_frame_interval(struct stimx274 *priv,
struct v4l2_fract frame_interval);
static inline void msleep_range(unsigned int delay_base)
{
usleep_range(delay_base * 1000, delay_base * 1000 + 500);
}
/*
* v4l2_ctrl and v4l2_subdev related operations
*/
static inline struct v4l2_subdev *ctrl_to_sd(struct v4l2_ctrl *ctrl)
{
return &container_of(ctrl->handler,
struct stimx274, ctrls.handler)->sd;
}
static inline struct stimx274 *to_imx274(struct v4l2_subdev *sd)
{
return container_of(sd, struct stimx274, sd);
}
/*
* Writing a register table
*
* @priv: Pointer to device
* @table: Table containing register values (with optional delays)
*
* This is used to write register table into sensor's reg map.
*
* Return: 0 on success, errors otherwise
*/
static int imx274_write_table(struct stimx274 *priv, const struct reg_8 table[])
{
struct regmap *regmap = priv->regmap;
int err = 0;
const struct reg_8 *next;
u8 val;
int range_start = -1;
int range_count = 0;
u8 range_vals[16];
int max_range_vals = ARRAY_SIZE(range_vals);
for (next = table;; next++) {
if ((next->addr != range_start + range_count) ||
(next->addr == IMX274_TABLE_END) ||
(next->addr == IMX274_TABLE_WAIT_MS) ||
(range_count == max_range_vals)) {
if (range_count == 1)
err = regmap_write(regmap,
range_start, range_vals[0]);
else if (range_count > 1)
err = regmap_bulk_write(regmap, range_start,
&range_vals[0],
range_count);
else
err = 0;
if (err)
return err;
range_start = -1;
range_count = 0;
/* Handle special address values */
if (next->addr == IMX274_TABLE_END)
break;
if (next->addr == IMX274_TABLE_WAIT_MS) {
msleep_range(next->val);
continue;
}
}
val = next->val;
if (range_start == -1)
range_start = next->addr;
range_vals[range_count++] = val;
}
return 0;
}
static inline int imx274_read_reg(struct stimx274 *priv, u16 addr, u8 *val)
{
int err;
err = regmap_read(priv->regmap, addr, (unsigned int *)val);
if (err)
dev_err(&priv->client->dev,
"%s : i2c read failed, addr = %x\n", __func__, addr);
else
dev_dbg(&priv->client->dev,
"%s : addr 0x%x, val=0x%x\n", __func__,
addr, *val);
return err;
}
static inline int imx274_write_reg(struct stimx274 *priv, u16 addr, u8 val)
{
int err;
err = regmap_write(priv->regmap, addr, val);
if (err)
dev_err(&priv->client->dev,
"%s : i2c write failed, %x = %x\n", __func__,
addr, val);
else
dev_dbg(&priv->client->dev,
"%s : addr 0x%x, val=0x%x\n", __func__,
addr, val);
return err;
}
/**
* Write a multibyte register.
*
* Uses a bulk write where possible.
*
* @priv: Pointer to device structure
* @addr: Address of the LSB register. Other registers must be
* consecutive, least-to-most significant.
* @val: Value to be written to the register (cpu endianness)
* @nbytes: Number of bits to write (range: [1..3])
*/
static int imx274_write_mbreg(struct stimx274 *priv, u16 addr, u32 val,
size_t nbytes)
{
__le32 val_le = cpu_to_le32(val);
int err;
err = regmap_bulk_write(priv->regmap, addr, &val_le, nbytes);
if (err)
dev_err(&priv->client->dev,
"%s : i2c bulk write failed, %x = %x (%zu bytes)\n",
__func__, addr, val, nbytes);
else
dev_dbg(&priv->client->dev,
"%s : addr 0x%x, val=0x%x (%zu bytes)\n",
__func__, addr, val, nbytes);
return err;
}
/*
* Set mode registers to start stream.
* @priv: Pointer to device structure
*
* Return: 0 on success, errors otherwise
*/
static int imx274_mode_regs(struct stimx274 *priv)
{
int err = 0;
err = imx274_write_table(priv, imx274_start_1);
if (err)
return err;
err = imx274_write_table(priv, imx274_start_2);
if (err)
return err;
err = imx274_write_table(priv, priv->mode->init_regs);
return err;
}
/*
* imx274_start_stream - Function for starting stream per mode index
* @priv: Pointer to device structure
*
* Return: 0 on success, errors otherwise
*/
static int imx274_start_stream(struct stimx274 *priv)
{
int err = 0;
/*
* Refer to "Standby Cancel Sequence when using CSI-2" in
* imx274 datasheet, it should wait 10ms or more here.
* give it 1 extra ms for margin
*/
msleep_range(11);
err = imx274_write_table(priv, imx274_start_3);
if (err)
return err;
/*
* Refer to "Standby Cancel Sequence when using CSI-2" in
* imx274 datasheet, it should wait 7ms or more here.
* give it 1 extra ms for margin
*/
msleep_range(8);
err = imx274_write_table(priv, imx274_start_4);
if (err)
return err;
return 0;
}
/*
* imx274_reset - Function called to reset the sensor
* @priv: Pointer to device structure
* @rst: Input value for determining the sensor's end state after reset
*
* Set the senor in reset and then
* if rst = 0, keep it in reset;
* if rst = 1, bring it out of reset.
*
*/
static void imx274_reset(struct stimx274 *priv, int rst)
{
gpiod_set_value_cansleep(priv->reset_gpio, 0);
usleep_range(IMX274_RESET_DELAY1, IMX274_RESET_DELAY2);
gpiod_set_value_cansleep(priv->reset_gpio, !!rst);
usleep_range(IMX274_RESET_DELAY1, IMX274_RESET_DELAY2);
}
/**
* imx274_s_ctrl - This is used to set the imx274 V4L2 controls
* @ctrl: V4L2 control to be set
*
* This function is used to set the V4L2 controls for the imx274 sensor.
*
* Return: 0 on success, errors otherwise
*/
static int imx274_s_ctrl(struct v4l2_ctrl *ctrl)
{
struct v4l2_subdev *sd = ctrl_to_sd(ctrl);
struct stimx274 *imx274 = to_imx274(sd);
int ret = -EINVAL;
dev_dbg(&imx274->client->dev,
"%s : s_ctrl: %s, value: %d\n", __func__,
ctrl->name, ctrl->val);
switch (ctrl->id) {
case V4L2_CID_EXPOSURE:
dev_dbg(&imx274->client->dev,
"%s : set V4L2_CID_EXPOSURE\n", __func__);
ret = imx274_set_exposure(imx274, ctrl->val);
break;
case V4L2_CID_GAIN:
dev_dbg(&imx274->client->dev,
"%s : set V4L2_CID_GAIN\n", __func__);
ret = imx274_set_gain(imx274, ctrl);
break;
case V4L2_CID_VFLIP:
dev_dbg(&imx274->client->dev,
"%s : set V4L2_CID_VFLIP\n", __func__);
ret = imx274_set_vflip(imx274, ctrl->val);
break;
case V4L2_CID_TEST_PATTERN:
dev_dbg(&imx274->client->dev,
"%s : set V4L2_CID_TEST_PATTERN\n", __func__);
ret = imx274_set_test_pattern(imx274, ctrl->val);
break;
}
return ret;
}
static int imx274_binning_goodness(struct stimx274 *imx274,
int w, int ask_w,
int h, int ask_h, u32 flags)
{
struct device *dev = &imx274->client->dev;
const int goodness = 100000;
int val = 0;
if (flags & V4L2_SEL_FLAG_GE) {
if (w < ask_w)
val -= goodness;
if (h < ask_h)
val -= goodness;
}
if (flags & V4L2_SEL_FLAG_LE) {
if (w > ask_w)
val -= goodness;
if (h > ask_h)
val -= goodness;
}
val -= abs(w - ask_w);
val -= abs(h - ask_h);
dev_dbg(dev, "%s: ask %dx%d, size %dx%d, goodness %d\n",
__func__, ask_w, ask_h, w, h, val);
return val;
}
/**
* Helper function to change binning and set both compose and format.
*
* We have two entry points to change binning: set_fmt and
* set_selection(COMPOSE). Both have to compute the new output size
* and set it in both the compose rect and the frame format size. We
* also need to do the same things after setting cropping to restore
* 1:1 binning.
*
* This function contains the common code for these three cases, it
* has many arguments in order to accommodate the needs of all of
* them.
*
* Must be called with imx274->lock locked.
*
* @imx274: The device object
* @cfg: The pad config we are editing for TRY requests
* @which: V4L2_SUBDEV_FORMAT_ACTIVE or V4L2_SUBDEV_FORMAT_TRY from the caller
* @width: Input-output parameter: set to the desired width before
* the call, contains the chosen value after returning successfully
* @height: Input-output parameter for height (see @width)
* @flags: Selection flags from struct v4l2_subdev_selection, or 0 if not
* available (when called from set_fmt)
*/
static int __imx274_change_compose(struct stimx274 *imx274,
struct v4l2_subdev_pad_config *cfg,
u32 which,
u32 *width,
u32 *height,
u32 flags)
{
struct device *dev = &imx274->client->dev;
const struct v4l2_rect *cur_crop;
struct v4l2_mbus_framefmt *tgt_fmt;
unsigned int i;
const struct imx274_frmfmt *best_mode = &imx274_formats[0];
int best_goodness = INT_MIN;
if (which == V4L2_SUBDEV_FORMAT_TRY) {
cur_crop = &cfg->try_crop;
tgt_fmt = &cfg->try_fmt;
} else {
cur_crop = &imx274->crop;
tgt_fmt = &imx274->format;
}
for (i = 0; i < ARRAY_SIZE(imx274_formats); i++) {
unsigned int ratio = imx274_formats[i].bin_ratio;
int goodness = imx274_binning_goodness(
imx274,
cur_crop->width / ratio, *width,
cur_crop->height / ratio, *height,
flags);
if (goodness >= best_goodness) {
best_goodness = goodness;
best_mode = &imx274_formats[i];
}
}
*width = cur_crop->width / best_mode->bin_ratio;
*height = cur_crop->height / best_mode->bin_ratio;
if (which == V4L2_SUBDEV_FORMAT_ACTIVE)
imx274->mode = best_mode;
dev_dbg(dev, "%s: selected %u:1 binning\n",
__func__, best_mode->bin_ratio);
tgt_fmt->width = *width;
tgt_fmt->height = *height;
tgt_fmt->field = V4L2_FIELD_NONE;
return 0;
}
/**
* imx274_get_fmt - Get the pad format
* @sd: Pointer to V4L2 Sub device structure
* @cfg: Pointer to sub device pad information structure
* @fmt: Pointer to pad level media bus format
*
* This function is used to get the pad format information.
*
* Return: 0 on success
*/
static int imx274_get_fmt(struct v4l2_subdev *sd,
struct v4l2_subdev_pad_config *cfg,
struct v4l2_subdev_format *fmt)
{
struct stimx274 *imx274 = to_imx274(sd);
mutex_lock(&imx274->lock);
fmt->format = imx274->format;
mutex_unlock(&imx274->lock);
return 0;
}
/**
* imx274_set_fmt - This is used to set the pad format
* @sd: Pointer to V4L2 Sub device structure
* @cfg: Pointer to sub device pad information structure
* @format: Pointer to pad level media bus format
*
* This function is used to set the pad format.
*
* Return: 0 on success
*/
static int imx274_set_fmt(struct v4l2_subdev *sd,
struct v4l2_subdev_pad_config *cfg,
struct v4l2_subdev_format *format)
{
struct v4l2_mbus_framefmt *fmt = &format->format;
struct stimx274 *imx274 = to_imx274(sd);
int err = 0;
mutex_lock(&imx274->lock);
err = __imx274_change_compose(imx274, cfg, format->which,
&fmt->width, &fmt->height, 0);
if (err)
goto out;
/*
* __imx274_change_compose already set width and height in the
* applicable format, but we need to keep all other format
* values, so do a full copy here
*/
fmt->field = V4L2_FIELD_NONE;
if (format->which == V4L2_SUBDEV_FORMAT_TRY)
cfg->try_fmt = *fmt;
else
imx274->format = *fmt;
out:
mutex_unlock(&imx274->lock);
return err;
}
static int imx274_get_selection(struct v4l2_subdev *sd,
struct v4l2_subdev_pad_config *cfg,
struct v4l2_subdev_selection *sel)
{
struct stimx274 *imx274 = to_imx274(sd);
const struct v4l2_rect *src_crop;
const struct v4l2_mbus_framefmt *src_fmt;
int ret = 0;
if (sel->pad != 0)
return -EINVAL;
if (sel->target == V4L2_SEL_TGT_CROP_BOUNDS) {
sel->r.left = 0;
sel->r.top = 0;
sel->r.width = IMX274_MAX_WIDTH;
sel->r.height = IMX274_MAX_HEIGHT;
return 0;
}
if (sel->which == V4L2_SUBDEV_FORMAT_TRY) {
src_crop = &cfg->try_crop;
src_fmt = &cfg->try_fmt;
} else {
src_crop = &imx274->crop;
src_fmt = &imx274->format;
}
mutex_lock(&imx274->lock);
switch (sel->target) {
case V4L2_SEL_TGT_CROP:
sel->r = *src_crop;
break;
case V4L2_SEL_TGT_COMPOSE_BOUNDS:
sel->r.top = 0;
sel->r.left = 0;
sel->r.width = src_crop->width;
sel->r.height = src_crop->height;
break;
case V4L2_SEL_TGT_COMPOSE:
sel->r.top = 0;
sel->r.left = 0;
sel->r.width = src_fmt->width;
sel->r.height = src_fmt->height;
break;
default:
ret = -EINVAL;
}
mutex_unlock(&imx274->lock);
return ret;
}
static int imx274_set_selection_crop(struct stimx274 *imx274,
struct v4l2_subdev_pad_config *cfg,
struct v4l2_subdev_selection *sel)
{
struct v4l2_rect *tgt_crop;
struct v4l2_rect new_crop;
bool size_changed;
/*
* h_step could be 12 or 24 depending on the binning. But we
* won't know the binning until we choose the mode later in
* __imx274_change_compose(). Thus let's be safe and use the
* most conservative value in all cases.
*/
const u32 h_step = 24;
new_crop.width = min_t(u32,
IMX274_ROUND(sel->r.width, h_step, sel->flags),
IMX274_MAX_WIDTH);
/* Constraint: HTRIMMING_END - HTRIMMING_START >= 144 */
if (new_crop.width < 144)
new_crop.width = 144;
new_crop.left = min_t(u32,
IMX274_ROUND(sel->r.left, h_step, 0),
IMX274_MAX_WIDTH - new_crop.width);
new_crop.height = min_t(u32,
IMX274_ROUND(sel->r.height, 2, sel->flags),
IMX274_MAX_HEIGHT);
new_crop.top = min_t(u32, IMX274_ROUND(sel->r.top, 2, 0),
IMX274_MAX_HEIGHT - new_crop.height);
sel->r = new_crop;
if (sel->which == V4L2_SUBDEV_FORMAT_TRY)
tgt_crop = &cfg->try_crop;
else
tgt_crop = &imx274->crop;
mutex_lock(&imx274->lock);
size_changed = (new_crop.width != tgt_crop->width ||
new_crop.height != tgt_crop->height);
/* __imx274_change_compose needs the new size in *tgt_crop */
*tgt_crop = new_crop;
/* if crop size changed then reset the output image size */
if (size_changed)
__imx274_change_compose(imx274, cfg, sel->which,
&new_crop.width, &new_crop.height,
sel->flags);
mutex_unlock(&imx274->lock);
return 0;
}
static int imx274_set_selection(struct v4l2_subdev *sd,
struct v4l2_subdev_pad_config *cfg,
struct v4l2_subdev_selection *sel)
{
struct stimx274 *imx274 = to_imx274(sd);
if (sel->pad != 0)
return -EINVAL;
if (sel->target == V4L2_SEL_TGT_CROP)
return imx274_set_selection_crop(imx274, cfg, sel);
if (sel->target == V4L2_SEL_TGT_COMPOSE) {
int err;
mutex_lock(&imx274->lock);
err = __imx274_change_compose(imx274, cfg, sel->which,
&sel->r.width, &sel->r.height,
sel->flags);
mutex_unlock(&imx274->lock);
/*
* __imx274_change_compose already set width and
* height in set->r, we still need to set top-left
*/
if (!err) {
sel->r.top = 0;
sel->r.left = 0;
}
return err;
}
return -EINVAL;
}
static int imx274_apply_trimming(struct stimx274 *imx274)
{
u32 h_start;
u32 h_end;
u32 hmax;
u32 v_cut;
s32 v_pos;
u32 write_v_size;
u32 y_out_size;
int err;
h_start = imx274->crop.left + 12;
h_end = h_start + imx274->crop.width;
/* Use the minimum allowed value of HMAX */
/* Note: except in mode 1, (width / 16 + 23) is always < hmax_min */
/* Note: 260 is the minimum HMAX in all implemented modes */
hmax = max_t(u32, 260, (imx274->crop.width) / 16 + 23);
/* invert v_pos if VFLIP */
v_pos = imx274->ctrls.vflip->cur.val ?
(-imx274->crop.top / 2) : (imx274->crop.top / 2);
v_cut = (IMX274_MAX_HEIGHT - imx274->crop.height) / 2;
write_v_size = imx274->crop.height + 22;
y_out_size = imx274->crop.height + 14;
err = imx274_write_mbreg(imx274, IMX274_HMAX_REG_LSB, hmax, 2);
if (!err)
err = imx274_write_mbreg(imx274, IMX274_HTRIM_EN_REG, 1, 1);
if (!err)
err = imx274_write_mbreg(imx274, IMX274_HTRIM_START_REG_LSB,
h_start, 2);
if (!err)
err = imx274_write_mbreg(imx274, IMX274_HTRIM_END_REG_LSB,
h_end, 2);
if (!err)
err = imx274_write_mbreg(imx274, IMX274_VWIDCUTEN_REG, 1, 1);
if (!err)
err = imx274_write_mbreg(imx274, IMX274_VWIDCUT_REG_LSB,
v_cut, 2);
if (!err)
err = imx274_write_mbreg(imx274, IMX274_VWINPOS_REG_LSB,
v_pos, 2);
if (!err)
err = imx274_write_mbreg(imx274, IMX274_WRITE_VSIZE_REG_LSB,
write_v_size, 2);
if (!err)
err = imx274_write_mbreg(imx274, IMX274_Y_OUT_SIZE_REG_LSB,
y_out_size, 2);
return err;
}
/**
* imx274_g_frame_interval - Get the frame interval
* @sd: Pointer to V4L2 Sub device structure
* @fi: Pointer to V4l2 Sub device frame interval structure
*
* This function is used to get the frame interval.
*
* Return: 0 on success
*/
static int imx274_g_frame_interval(struct v4l2_subdev *sd,
struct v4l2_subdev_frame_interval *fi)
{
struct stimx274 *imx274 = to_imx274(sd);
fi->interval = imx274->frame_interval;
dev_dbg(&imx274->client->dev, "%s frame rate = %d / %d\n",
__func__, imx274->frame_interval.numerator,
imx274->frame_interval.denominator);
return 0;
}
/**
* imx274_s_frame_interval - Set the frame interval
* @sd: Pointer to V4L2 Sub device structure
* @fi: Pointer to V4l2 Sub device frame interval structure
*
* This function is used to set the frame intervavl.
*
* Return: 0 on success
*/
static int imx274_s_frame_interval(struct v4l2_subdev *sd,
struct v4l2_subdev_frame_interval *fi)
{
struct stimx274 *imx274 = to_imx274(sd);
struct v4l2_ctrl *ctrl = imx274->ctrls.exposure;
int min, max, def;
int ret;
mutex_lock(&imx274->lock);
ret = imx274_set_frame_interval(imx274, fi->interval);
if (!ret) {
/*
* exposure time range is decided by frame interval
* need to update it after frame interval changes
*/
min = IMX274_MIN_EXPOSURE_TIME;
max = fi->interval.numerator * 1000000
/ fi->interval.denominator;
def = max;
if (__v4l2_ctrl_modify_range(ctrl, min, max, 1, def)) {
dev_err(&imx274->client->dev,
"Exposure ctrl range update failed\n");
goto unlock;
}
/* update exposure time accordingly */
imx274_set_exposure(imx274, ctrl->val);
dev_dbg(&imx274->client->dev, "set frame interval to %uus\n",
fi->interval.numerator * 1000000
/ fi->interval.denominator);
}
unlock:
mutex_unlock(&imx274->lock);
return ret;
}
/**
* imx274_load_default - load default control values
* @priv: Pointer to device structure
*
* Return: 0 on success, errors otherwise
*/
static int imx274_load_default(struct stimx274 *priv)
{
int ret;
/* load default control values */
priv->frame_interval.numerator = 1;
priv->frame_interval.denominator = IMX274_DEF_FRAME_RATE;
priv->ctrls.exposure->val = 1000000 / IMX274_DEF_FRAME_RATE;
priv->ctrls.gain->val = IMX274_DEF_GAIN;
priv->ctrls.vflip->val = 0;
priv->ctrls.test_pattern->val = TEST_PATTERN_DISABLED;
/* update frame rate */
ret = imx274_set_frame_interval(priv,
priv->frame_interval);
if (ret)
return ret;
/* update exposure time */
ret = v4l2_ctrl_s_ctrl(priv->ctrls.exposure, priv->ctrls.exposure->val);
if (ret)
return ret;
/* update gain */
ret = v4l2_ctrl_s_ctrl(priv->ctrls.gain, priv->ctrls.gain->val);
if (ret)
return ret;
/* update vflip */
ret = v4l2_ctrl_s_ctrl(priv->ctrls.vflip, priv->ctrls.vflip->val);
if (ret)
return ret;
return 0;
}
/**
* imx274_s_stream - It is used to start/stop the streaming.
* @sd: V4L2 Sub device
* @on: Flag (True / False)
*
* This function controls the start or stop of streaming for the
* imx274 sensor.
*
* Return: 0 on success, errors otherwise
*/
static int imx274_s_stream(struct v4l2_subdev *sd, int on)
{
struct stimx274 *imx274 = to_imx274(sd);
int ret = 0;
dev_dbg(&imx274->client->dev, "%s : %s, mode index = %td\n", __func__,
on ? "Stream Start" : "Stream Stop",
imx274->mode - &imx274_formats[0]);
mutex_lock(&imx274->lock);
if (on) {
/* load mode registers */
ret = imx274_mode_regs(imx274);
if (ret)
goto fail;
ret = imx274_apply_trimming(imx274);
if (ret)
goto fail;
/*
* update frame rate & expsoure. if the last mode is different,
* HMAX could be changed. As the result, frame rate & exposure
* are changed.
* gain is not affected.
*/
ret = imx274_set_frame_interval(imx274,
imx274->frame_interval);
if (ret)
goto fail;
/* update exposure time */
ret = __v4l2_ctrl_s_ctrl(imx274->ctrls.exposure,
imx274->ctrls.exposure->val);
if (ret)
goto fail;
/* start stream */
ret = imx274_start_stream(imx274);
if (ret)
goto fail;
} else {
/* stop stream */
ret = imx274_write_table(imx274, imx274_stop);
if (ret)
goto fail;
}
mutex_unlock(&imx274->lock);
dev_dbg(&imx274->client->dev, "%s : Done\n", __func__);
return 0;
fail:
mutex_unlock(&imx274->lock);
dev_err(&imx274->client->dev, "s_stream failed\n");
return ret;
}
/*
* imx274_get_frame_length - Function for obtaining current frame length
* @priv: Pointer to device structure
* @val: Pointer to obainted value
*
* frame_length = vmax x (svr + 1), in unit of hmax.
*
* Return: 0 on success
*/
static int imx274_get_frame_length(struct stimx274 *priv, u32 *val)
{
int err;
u16 svr;
u32 vmax;
u8 reg_val[3];
/* svr */
err = imx274_read_reg(priv, IMX274_SVR_REG_LSB, &reg_val[0]);
if (err)
goto fail;
err = imx274_read_reg(priv, IMX274_SVR_REG_MSB, &reg_val[1]);
if (err)
goto fail;
svr = (reg_val[1] << IMX274_SHIFT_8_BITS) + reg_val[0];
/* vmax */
err = imx274_read_reg(priv, IMX274_VMAX_REG_3, &reg_val[0]);
if (err)
goto fail;
err = imx274_read_reg(priv, IMX274_VMAX_REG_2, &reg_val[1]);
if (err)
goto fail;
err = imx274_read_reg(priv, IMX274_VMAX_REG_1, &reg_val[2]);
if (err)
goto fail;
vmax = ((reg_val[2] & IMX274_MASK_LSB_3_BITS) << IMX274_SHIFT_16_BITS)
+ (reg_val[1] << IMX274_SHIFT_8_BITS) + reg_val[0];
*val = vmax * (svr + 1);
return 0;
fail:
dev_err(&priv->client->dev, "%s error = %d\n", __func__, err);
return err;
}
static int imx274_clamp_coarse_time(struct stimx274 *priv, u32 *val,
u32 *frame_length)
{
int err;
err = imx274_get_frame_length(priv, frame_length);
if (err)
return err;
if (*frame_length < priv->mode->min_frame_len)
*frame_length = priv->mode->min_frame_len;
*val = *frame_length - *val; /* convert to raw shr */
if (*val > *frame_length - IMX274_SHR_LIMIT_CONST)
*val = *frame_length - IMX274_SHR_LIMIT_CONST;
else if (*val < priv->mode->min_SHR)
*val = priv->mode->min_SHR;
return 0;
}
/*
* imx274_set_digital gain - Function called when setting digital gain
* @priv: Pointer to device structure
* @dgain: Value of digital gain.
*
* Digital gain has only 4 steps: 1x, 2x, 4x, and 8x
*
* Return: 0 on success
*/
static int imx274_set_digital_gain(struct stimx274 *priv, u32 dgain)
{
u8 reg_val;
reg_val = ffs(dgain);
if (reg_val)
reg_val--;
reg_val = clamp(reg_val, (u8)0, (u8)3);
return imx274_write_reg(priv, IMX274_DIGITAL_GAIN_REG,
reg_val & IMX274_MASK_LSB_4_BITS);
}
/*
* imx274_set_gain - Function called when setting gain
* @priv: Pointer to device structure
* @val: Value of gain. the real value = val << IMX274_GAIN_SHIFT;
* @ctrl: v4l2 control pointer
*
* Set the gain based on input value.
* The caller should hold the mutex lock imx274->lock if necessary
*
* Return: 0 on success
*/
static int imx274_set_gain(struct stimx274 *priv, struct v4l2_ctrl *ctrl)
{
int err;
u32 gain, analog_gain, digital_gain, gain_reg;
gain = (u32)(ctrl->val);
dev_dbg(&priv->client->dev,
"%s : input gain = %d.%d\n", __func__,
gain >> IMX274_GAIN_SHIFT,
((gain & IMX274_GAIN_SHIFT_MASK) * 100) >> IMX274_GAIN_SHIFT);
if (gain > IMX274_MAX_DIGITAL_GAIN * IMX274_MAX_ANALOG_GAIN)
gain = IMX274_MAX_DIGITAL_GAIN * IMX274_MAX_ANALOG_GAIN;
else if (gain < IMX274_MIN_GAIN)
gain = IMX274_MIN_GAIN;
if (gain <= IMX274_MAX_ANALOG_GAIN)
digital_gain = 1;
else if (gain <= IMX274_MAX_ANALOG_GAIN * 2)
digital_gain = 2;
else if (gain <= IMX274_MAX_ANALOG_GAIN * 4)
digital_gain = 4;
else
digital_gain = IMX274_MAX_DIGITAL_GAIN;
analog_gain = gain / digital_gain;
dev_dbg(&priv->client->dev,
"%s : digital gain = %d, analog gain = %d.%d\n",
__func__, digital_gain, analog_gain >> IMX274_GAIN_SHIFT,
((analog_gain & IMX274_GAIN_SHIFT_MASK) * 100)
>> IMX274_GAIN_SHIFT);
err = imx274_set_digital_gain(priv, digital_gain);
if (err)
goto fail;
/* convert to register value, refer to imx274 datasheet */
gain_reg = (u32)IMX274_GAIN_CONST -
(IMX274_GAIN_CONST << IMX274_GAIN_SHIFT) / analog_gain;
if (gain_reg > IMX274_GAIN_REG_MAX)
gain_reg = IMX274_GAIN_REG_MAX;
err = imx274_write_mbreg(priv, IMX274_ANALOG_GAIN_ADDR_LSB, gain_reg,
2);
if (err)
goto fail;
if (IMX274_GAIN_CONST - gain_reg == 0) {
err = -EINVAL;
goto fail;
}
/* convert register value back to gain value */
ctrl->val = (IMX274_GAIN_CONST << IMX274_GAIN_SHIFT)
/ (IMX274_GAIN_CONST - gain_reg) * digital_gain;
dev_dbg(&priv->client->dev,
"%s : GAIN control success, gain_reg = %d, new gain = %d\n",
__func__, gain_reg, ctrl->val);
return 0;
fail:
dev_err(&priv->client->dev, "%s error = %d\n", __func__, err);
return err;
}
/*
* imx274_set_coarse_time - Function called when setting SHR value
* @priv: Pointer to device structure
* @val: Value for exposure time in number of line_length, or [HMAX]
*
* Set SHR value based on input value.
*
* Return: 0 on success
*/
static int imx274_set_coarse_time(struct stimx274 *priv, u32 *val)
{
int err;
u32 coarse_time, frame_length;
coarse_time = *val;
/* convert exposure_time to appropriate SHR value */
err = imx274_clamp_coarse_time(priv, &coarse_time, &frame_length);
if (err)
goto fail;
err = imx274_write_mbreg(priv, IMX274_SHR_REG_LSB, coarse_time, 2);
if (err)
goto fail;
*val = frame_length - coarse_time;
return 0;
fail:
dev_err(&priv->client->dev, "%s error = %d\n", __func__, err);
return err;
}
/*
* imx274_set_exposure - Function called when setting exposure time
* @priv: Pointer to device structure
* @val: Variable for exposure time, in the unit of micro-second
*
* Set exposure time based on input value.
* The caller should hold the mutex lock imx274->lock if necessary
*
* Return: 0 on success
*/
static int imx274_set_exposure(struct stimx274 *priv, int val)
{
int err;
u16 hmax;
u8 reg_val[2];
u32 coarse_time; /* exposure time in unit of line (HMAX)*/
dev_dbg(&priv->client->dev,
"%s : EXPOSURE control input = %d\n", __func__, val);
/* step 1: convert input exposure_time (val) into number of 1[HMAX] */
/* obtain HMAX value */
err = imx274_read_reg(priv, IMX274_HMAX_REG_LSB, &reg_val[0]);
if (err)
goto fail;
err = imx274_read_reg(priv, IMX274_HMAX_REG_MSB, &reg_val[1]);
if (err)
goto fail;
hmax = (reg_val[1] << IMX274_SHIFT_8_BITS) + reg_val[0];
if (hmax == 0) {
err = -EINVAL;
goto fail;
}
coarse_time = (IMX274_PIXCLK_CONST1 / IMX274_PIXCLK_CONST2 * val
- priv->mode->nocpiop) / hmax;
/* step 2: convert exposure_time into SHR value */
/* set SHR */
err = imx274_set_coarse_time(priv, &coarse_time);
if (err)
goto fail;
priv->ctrls.exposure->val =
(coarse_time * hmax + priv->mode->nocpiop)
/ (IMX274_PIXCLK_CONST1 / IMX274_PIXCLK_CONST2);
dev_dbg(&priv->client->dev,
"%s : EXPOSURE control success\n", __func__);
return 0;
fail:
dev_err(&priv->client->dev, "%s error = %d\n", __func__, err);
return err;
}
/*
* imx274_set_vflip - Function called when setting vertical flip
* @priv: Pointer to device structure
* @val: Value for vflip setting
*
* Set vertical flip based on input value.
* val = 0: normal, no vertical flip
* val = 1: vertical flip enabled
* The caller should hold the mutex lock imx274->lock if necessary
*
* Return: 0 on success
*/
static int imx274_set_vflip(struct stimx274 *priv, int val)
{
int err;
err = imx274_write_reg(priv, IMX274_VFLIP_REG, val);
if (err) {
dev_err(&priv->client->dev, "VFLIP control error\n");
return err;
}
dev_dbg(&priv->client->dev,
"%s : VFLIP control success\n", __func__);
return 0;
}
/*
* imx274_set_test_pattern - Function called when setting test pattern
* @priv: Pointer to device structure
* @val: Variable for test pattern
*
* Set to different test patterns based on input value.
*
* Return: 0 on success
*/
static int imx274_set_test_pattern(struct stimx274 *priv, int val)
{
int err = 0;
if (val == TEST_PATTERN_DISABLED) {
err = imx274_write_table(priv, imx274_tp_disabled);
} else if (val <= TEST_PATTERN_V_COLOR_BARS) {
err = imx274_write_reg(priv, IMX274_TEST_PATTERN_REG, val - 1);
if (!err)
err = imx274_write_table(priv, imx274_tp_regs);
} else {
err = -EINVAL;
}
if (!err)
dev_dbg(&priv->client->dev,
"%s : TEST PATTERN control success\n", __func__);
else
dev_err(&priv->client->dev, "%s error = %d\n", __func__, err);
return err;
}
/*
* imx274_set_frame_length - Function called when setting frame length
* @priv: Pointer to device structure
* @val: Variable for frame length (= VMAX, i.e. vertical drive period length)
*
* Set frame length based on input value.
*
* Return: 0 on success
*/
static int imx274_set_frame_length(struct stimx274 *priv, u32 val)
{
int err;
u32 frame_length;
dev_dbg(&priv->client->dev, "%s : input length = %d\n",
__func__, val);
frame_length = (u32)val;
err = imx274_write_mbreg(priv, IMX274_VMAX_REG_3, frame_length, 3);
if (err)
goto fail;
return 0;
fail:
dev_err(&priv->client->dev, "%s error = %d\n", __func__, err);
return err;
}
/*
* imx274_set_frame_interval - Function called when setting frame interval
* @priv: Pointer to device structure
* @frame_interval: Variable for frame interval
*
* Change frame interval by updating VMAX value
* The caller should hold the mutex lock imx274->lock if necessary
*
* Return: 0 on success
*/
static int imx274_set_frame_interval(struct stimx274 *priv,
struct v4l2_fract frame_interval)
{
int err;
u32 frame_length, req_frame_rate;
u16 svr;
u16 hmax;
u8 reg_val[2];
dev_dbg(&priv->client->dev, "%s: input frame interval = %d / %d",
__func__, frame_interval.numerator,
frame_interval.denominator);
if (frame_interval.numerator == 0) {
err = -EINVAL;
goto fail;
}
req_frame_rate = (u32)(frame_interval.denominator
/ frame_interval.numerator);
/* boundary check */
if (req_frame_rate > priv->mode->max_fps) {
frame_interval.numerator = 1;
frame_interval.denominator = priv->mode->max_fps;
} else if (req_frame_rate < IMX274_MIN_FRAME_RATE) {
frame_interval.numerator = 1;
frame_interval.denominator = IMX274_MIN_FRAME_RATE;
}
/*
* VMAX = 1/frame_rate x 72M / (SVR+1) / HMAX
* frame_length (i.e. VMAX) = (frame_interval) x 72M /(SVR+1) / HMAX
*/
/* SVR */
err = imx274_read_reg(priv, IMX274_SVR_REG_LSB, &reg_val[0]);
if (err)
goto fail;
err = imx274_read_reg(priv, IMX274_SVR_REG_MSB, &reg_val[1]);
if (err)
goto fail;
svr = (reg_val[1] << IMX274_SHIFT_8_BITS) + reg_val[0];
dev_dbg(&priv->client->dev,
"%s : register SVR = %d\n", __func__, svr);
/* HMAX */
err = imx274_read_reg(priv, IMX274_HMAX_REG_LSB, &reg_val[0]);
if (err)
goto fail;
err = imx274_read_reg(priv, IMX274_HMAX_REG_MSB, &reg_val[1]);
if (err)
goto fail;
hmax = (reg_val[1] << IMX274_SHIFT_8_BITS) + reg_val[0];
dev_dbg(&priv->client->dev,
"%s : register HMAX = %d\n", __func__, hmax);
if (hmax == 0 || frame_interval.denominator == 0) {
err = -EINVAL;
goto fail;
}
frame_length = IMX274_PIXCLK_CONST1 / (svr + 1) / hmax
* frame_interval.numerator
/ frame_interval.denominator;
err = imx274_set_frame_length(priv, frame_length);
if (err)
goto fail;
priv->frame_interval = frame_interval;
return 0;
fail:
dev_err(&priv->client->dev, "%s error = %d\n", __func__, err);
return err;
}
static const struct v4l2_subdev_pad_ops imx274_pad_ops = {
.get_fmt = imx274_get_fmt,
.set_fmt = imx274_set_fmt,
.get_selection = imx274_get_selection,
.set_selection = imx274_set_selection,
};
static const struct v4l2_subdev_video_ops imx274_video_ops = {
.g_frame_interval = imx274_g_frame_interval,
.s_frame_interval = imx274_s_frame_interval,
.s_stream = imx274_s_stream,
};
static const struct v4l2_subdev_ops imx274_subdev_ops = {
.pad = &imx274_pad_ops,
.video = &imx274_video_ops,
};
static const struct v4l2_ctrl_ops imx274_ctrl_ops = {
.s_ctrl = imx274_s_ctrl,
};
static const struct of_device_id imx274_of_id_table[] = {
{ .compatible = "sony,imx274" },
{ }
};
MODULE_DEVICE_TABLE(of, imx274_of_id_table);
static const struct i2c_device_id imx274_id[] = {
{ "IMX274", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, imx274_id);
static int imx274_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct v4l2_subdev *sd;
struct stimx274 *imx274;
int ret;
/* initialize imx274 */
imx274 = devm_kzalloc(&client->dev, sizeof(*imx274), GFP_KERNEL);
if (!imx274)
return -ENOMEM;
mutex_init(&imx274->lock);
/* initialize format */
imx274->mode = &imx274_formats[IMX274_DEFAULT_MODE];
imx274->crop.width = IMX274_MAX_WIDTH;
imx274->crop.height = IMX274_MAX_HEIGHT;
imx274->format.width = imx274->crop.width / imx274->mode->bin_ratio;
imx274->format.height = imx274->crop.height / imx274->mode->bin_ratio;
imx274->format.field = V4L2_FIELD_NONE;
imx274->format.code = MEDIA_BUS_FMT_SRGGB10_1X10;
imx274->format.colorspace = V4L2_COLORSPACE_SRGB;
imx274->frame_interval.numerator = 1;
imx274->frame_interval.denominator = IMX274_DEF_FRAME_RATE;
/* initialize regmap */
imx274->regmap = devm_regmap_init_i2c(client, &imx274_regmap_config);
if (IS_ERR(imx274->regmap)) {
dev_err(&client->dev,
"regmap init failed: %ld\n", PTR_ERR(imx274->regmap));
ret = -ENODEV;
goto err_regmap;
}
/* initialize subdevice */
imx274->client = client;
sd = &imx274->sd;
v4l2_i2c_subdev_init(sd, client, &imx274_subdev_ops);
strscpy(sd->name, DRIVER_NAME, sizeof(sd->name));
sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE | V4L2_SUBDEV_FL_HAS_EVENTS;
/* initialize subdev media pad */
imx274->pad.flags = MEDIA_PAD_FL_SOURCE;
sd->entity.function = MEDIA_ENT_F_CAM_SENSOR;
ret = media_entity_pads_init(&sd->entity, 1, &imx274->pad);
if (ret < 0) {
dev_err(&client->dev,
"%s : media entity init Failed %d\n", __func__, ret);
goto err_regmap;
}
/* initialize sensor reset gpio */
imx274->reset_gpio = devm_gpiod_get_optional(&client->dev, "reset",
GPIOD_OUT_HIGH);
if (IS_ERR(imx274->reset_gpio)) {
if (PTR_ERR(imx274->reset_gpio) != -EPROBE_DEFER)
dev_err(&client->dev, "Reset GPIO not setup in DT");
ret = PTR_ERR(imx274->reset_gpio);
goto err_me;
}
/* pull sensor out of reset */
imx274_reset(imx274, 1);
/* initialize controls */
ret = v4l2_ctrl_handler_init(&imx274->ctrls.handler, 2);
if (ret < 0) {
dev_err(&client->dev,
"%s : ctrl handler init Failed\n", __func__);
goto err_me;
}
imx274->ctrls.handler.lock = &imx274->lock;
/* add new controls */
imx274->ctrls.test_pattern = v4l2_ctrl_new_std_menu_items(
&imx274->ctrls.handler, &imx274_ctrl_ops,
V4L2_CID_TEST_PATTERN,
ARRAY_SIZE(tp_qmenu) - 1, 0, 0, tp_qmenu);
imx274->ctrls.gain = v4l2_ctrl_new_std(
&imx274->ctrls.handler,
&imx274_ctrl_ops,
V4L2_CID_GAIN, IMX274_MIN_GAIN,
IMX274_MAX_DIGITAL_GAIN * IMX274_MAX_ANALOG_GAIN, 1,
IMX274_DEF_GAIN);
imx274->ctrls.exposure = v4l2_ctrl_new_std(
&imx274->ctrls.handler,
&imx274_ctrl_ops,
V4L2_CID_EXPOSURE, IMX274_MIN_EXPOSURE_TIME,
1000000 / IMX274_DEF_FRAME_RATE, 1,
IMX274_MIN_EXPOSURE_TIME);
imx274->ctrls.vflip = v4l2_ctrl_new_std(
&imx274->ctrls.handler,
&imx274_ctrl_ops,
V4L2_CID_VFLIP, 0, 1, 1, 0);
imx274->sd.ctrl_handler = &imx274->ctrls.handler;
if (imx274->ctrls.handler.error) {
ret = imx274->ctrls.handler.error;
goto err_ctrls;
}
/* setup default controls */
ret = v4l2_ctrl_handler_setup(&imx274->ctrls.handler);
if (ret) {
dev_err(&client->dev,
"Error %d setup default controls\n", ret);
goto err_ctrls;
}
/* load default control values */
ret = imx274_load_default(imx274);
if (ret) {
dev_err(&client->dev,
"%s : imx274_load_default failed %d\n",
__func__, ret);
goto err_ctrls;
}
/* register subdevice */
ret = v4l2_async_register_subdev(sd);
if (ret < 0) {
dev_err(&client->dev,
"%s : v4l2_async_register_subdev failed %d\n",
__func__, ret);
goto err_ctrls;
}
dev_info(&client->dev, "imx274 : imx274 probe success !\n");
return 0;
err_ctrls:
v4l2_ctrl_handler_free(&imx274->ctrls.handler);
err_me:
media_entity_cleanup(&sd->entity);
err_regmap:
mutex_destroy(&imx274->lock);
return ret;
}
static int imx274_remove(struct i2c_client *client)
{
struct v4l2_subdev *sd = i2c_get_clientdata(client);
struct stimx274 *imx274 = to_imx274(sd);
/* stop stream */
imx274_write_table(imx274, imx274_stop);
v4l2_async_unregister_subdev(sd);
v4l2_ctrl_handler_free(&imx274->ctrls.handler);
media_entity_cleanup(&sd->entity);
mutex_destroy(&imx274->lock);
return 0;
}
static struct i2c_driver imx274_i2c_driver = {
.driver = {
.name = DRIVER_NAME,
.of_match_table = imx274_of_id_table,
},
.probe = imx274_probe,
.remove = imx274_remove,
.id_table = imx274_id,
};
module_i2c_driver(imx274_i2c_driver);
MODULE_AUTHOR("Leon Luo <leonl@leopardimaging.com>");
MODULE_DESCRIPTION("IMX274 CMOS Image Sensor driver");
MODULE_LICENSE("GPL v2");
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