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linux/drivers/media/i2c/imx274.c
Mauro Carvalho Chehab 00b4bac78f media: imx274: don't randomly return if range_count is zero 
As smatch reported:
	drivers/media/i2c/imx274.c:659 imx274_regmap_util_write_table_8() error: uninitialized symbol 'err'.

There is a bug at imx274_regmap_util_write_table_8() with causes
it to randomly return a random error if range_count is zero.

Worse than that, the logic there starts with range_count
equal to zero, and periodically resets it to zero again.

As it is a way more likely that err assumes a non-zero value,
I suspect that the chance of this code to run is very small,
so, it would be worth to review the entire function.

Anyway, clearly it shouldn't be returning error if range_count
is zero. So, let's fix it.

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2017-12-11 13:04:53 -05:00

1813 lines
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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>
*
* 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/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_MODE_3840X2160
#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)
/*
* Constants for sensor reset delay
*/
#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_FRAME_LENGTH_ADDR_1 0x30FA /* VMAX, MSB */
#define IMX274_FRAME_LENGTH_ADDR_2 0x30F9 /* VMAX */
#define IMX274_FRAME_LENGTH_ADDR_3 0x30F8 /* VMAX, LSB */
#define IMX274_SVR_REG_MSB 0x300F /* SVR */
#define IMX274_SVR_REG_LSB 0x300E /* SVR */
#define IMX274_HMAX_REG_MSB 0x30F7 /* HMAX */
#define IMX274_HMAX_REG_LSB 0x30F6 /* HMAX */
#define IMX274_COARSE_TIME_ADDR_MSB 0x300D /* SHR */
#define IMX274_COARSE_TIME_ADDR_LSB 0x300C /* SHR */
#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_mode {
IMX274_MODE_3840X2160,
IMX274_MODE_1920X1080,
IMX274_MODE_1280X720,
IMX274_MODE_START_STREAM_1,
IMX274_MODE_START_STREAM_2,
IMX274_MODE_START_STREAM_3,
IMX274_MODE_START_STREAM_4,
IMX274_MODE_STOP_STREAM
};
/*
* imx274 format related structure
*/
struct imx274_frmfmt {
u32 mbus_code;
enum v4l2_colorspace colorspace;
struct v4l2_frmsize_discrete size;
enum imx274_mode mode;
};
/*
* 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, 0x02},
{0x3018, 0xA2}, /* output XVS, HVS */
{0x306B, 0x05},
{0x30E2, 0x01},
{0x30F6, 0x07}, /* HMAX, 263 */
{0x30F7, 0x01}, /* HMAX */
{0x30dd, 0x01}, /* crop to 2160 */
{0x30de, 0x06},
{0x30df, 0x00},
{0x30e0, 0x12},
{0x30e1, 0x00},
{0x3037, 0x01}, /* to crop to 3840 */
{0x3038, 0x0c},
{0x3039, 0x00},
{0x303a, 0x0c},
{0x303b, 0x0f},
{0x30EE, 0x01},
{0x3130, 0x86},
{0x3131, 0x08},
{0x3132, 0x7E},
{0x3133, 0x08},
{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, 0x11},
{0x3018, 0xA2}, /* output XVS, HVS */
{0x306B, 0x05},
{0x30E2, 0x02},
{0x30F6, 0x04}, /* HMAX, 260 */
{0x30F7, 0x01}, /* HMAX */
{0x30dd, 0x01}, /* to crop to 1920x1080 */
{0x30de, 0x05},
{0x30df, 0x00},
{0x30e0, 0x04},
{0x30e1, 0x00},
{0x3037, 0x01},
{0x3038, 0x0c},
{0x3039, 0x00},
{0x303a, 0x0c},
{0x303b, 0x0f},
{0x30EE, 0x01},
{0x3130, 0x4E},
{0x3131, 0x04},
{0x3132, 0x46},
{0x3133, 0x04},
{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, 0x09},
{0x3018, 0xA2}, /* output XVS, HVS */
{0x306B, 0x05},
{0x30E2, 0x03},
{0x30F6, 0x04}, /* HMAX, 260 */
{0x30F7, 0x01}, /* HMAX */
{0x30DD, 0x01},
{0x30DE, 0x07},
{0x30DF, 0x00},
{0x40E0, 0x04},
{0x30E1, 0x00},
{0x3030, 0xD4},
{0x3031, 0x02},
{0x3032, 0xD0},
{0x3033, 0x02},
{0x30EE, 0x01},
{0x3130, 0xE2},
{0x3131, 0x02},
{0x3132, 0xDE},
{0x3133, 0x02},
{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}
};
static const struct reg_8 *mode_table[] = {
[IMX274_MODE_3840X2160] = imx274_mode1_3840x2160_raw10,
[IMX274_MODE_1920X1080] = imx274_mode3_1920x1080_raw10,
[IMX274_MODE_1280X720] = imx274_mode5_1280x720_raw10,
[IMX274_MODE_START_STREAM_1] = imx274_start_1,
[IMX274_MODE_START_STREAM_2] = imx274_start_2,
[IMX274_MODE_START_STREAM_3] = imx274_start_3,
[IMX274_MODE_START_STREAM_4] = imx274_start_4,
[IMX274_MODE_STOP_STREAM] = imx274_stop,
};
/*
* imx274 format related structure
*/
static const struct imx274_frmfmt imx274_formats[] = {
{MEDIA_BUS_FMT_SRGGB10_1X10, V4L2_COLORSPACE_SRGB, {3840, 2160},
IMX274_MODE_3840X2160},
{MEDIA_BUS_FMT_SRGGB10_1X10, V4L2_COLORSPACE_SRGB, {1920, 1080},
IMX274_MODE_1920X1080},
{MEDIA_BUS_FMT_SRGGB10_1X10, V4L2_COLORSPACE_SRGB, {1280, 720},
IMX274_MODE_1280X720},
};
/*
* minimal frame length for each mode
* refer to datasheet section "Frame Rate Adjustment (CSI-2)"
*/
static const int min_frame_len[] = {
4550, /* mode 1, 4K */
2310, /* mode 3, 1080p */
2310 /* mode 5, 720p */
};
/*
* minimal numbers of SHR register
* refer to datasheet table "Shutter Setting (CSI-2)"
*/
static const int min_SHR[] = {
12, /* mode 1, 4K */
8, /* mode 3, 1080p */
8 /* mode 5, 720p */
};
static const int max_frame_rate[] = {
60, /* mode 1 , 4K */
120, /* mode 3, 1080p */
120 /* mode 5, 720p */
};
/*
* Number of clocks per internal offset period
* a constant based on mode
* refer to section "Integration Time in Each Readout Drive Mode (CSI-2)"
* in the datasheet
* for the implemented 3 modes, it happens to be the same number
*/
static const int nocpiop[] = {
112, /* mode 1 , 4K */
112, /* mode 3, 1080p */
112 /* mode 5, 720p */
};
/*
* 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
* @pd: Media pad structure
* @client: Pointer to I2C client
* @ctrls: imx274 control structure
* @format: V4L2 media bus frame format structure
* @frame_rate: V4L2 frame rate structure
* @regmap: Pointer to regmap structure
* @reset_gpio: Pointer to reset gpio
* @lock: Mutex structure
* @mode_index: Resolution mode index
*/
struct stimx274 {
struct v4l2_subdev sd;
struct media_pad pad;
struct i2c_client *client;
struct imx274_ctrls ctrls;
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 */
u32 mode_index;
};
/*
* 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);
}
/*
* imx274_regmap_util_write_table_8 - Function for writing register table
* @regmap: Pointer to device reg map structure
* @table: Table containing register values
* @wait_ms_addr: Flag for performing delay
* @end_addr: Flag for incating end of table
*
* This is used to write register table into sensor's reg map.
*
* Return: 0 on success, errors otherwise
*/
static int imx274_regmap_util_write_table_8(struct regmap *regmap,
const struct reg_8 table[],
u16 wait_ms_addr, u16 end_addr)
{
int err;
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 == end_addr) ||
(next->addr == wait_ms_addr) ||
(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 == end_addr)
break;
if (next->addr == wait_ms_addr) {
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;
}
static int imx274_write_table(struct stimx274 *priv, const struct reg_8 table[])
{
return imx274_regmap_util_write_table_8(priv->regmap,
table, IMX274_TABLE_WAIT_MS, IMX274_TABLE_END);
}
/*
* imx274_mode_regs - Function for set mode registers per mode index
* @priv: Pointer to device structure
* @mode: Mode index value
*
* This is used to start steam per mode index.
* mode = 0, start stream for sensor Mode 1: 4K/raw10
* mode = 1, start stream for sensor Mode 3: 1080p/raw10
* mode = 2, start stream for sensor Mode 5: 720p/raw10
*
* Return: 0 on success, errors otherwise
*/
static int imx274_mode_regs(struct stimx274 *priv, int mode)
{
int err = 0;
err = imx274_write_table(priv, mode_table[IMX274_MODE_START_STREAM_1]);
if (err)
return err;
err = imx274_write_table(priv, mode_table[IMX274_MODE_START_STREAM_2]);
if (err)
return err;
err = imx274_write_table(priv, mode_table[mode]);
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, mode_table[IMX274_MODE_START_STREAM_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, mode_table[IMX274_MODE_START_STREAM_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;
}
/**
* 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);
struct i2c_client *client = imx274->client;
int index;
dev_dbg(&client->dev,
"%s: width = %d height = %d code = %d mbus_code = %d\n",
__func__, fmt->width, fmt->height, fmt->code,
imx274_formats[imx274->mode_index].mbus_code);
mutex_lock(&imx274->lock);
for (index = 0; index < ARRAY_SIZE(imx274_formats); index++) {
if (imx274_formats[index].size.width == fmt->width &&
imx274_formats[index].size.height == fmt->height)
break;
}
if (index >= ARRAY_SIZE(imx274_formats)) {
/* default to first format */
index = 0;
}
imx274->mode_index = index;
if (fmt->width > IMX274_MAX_WIDTH)
fmt->width = IMX274_MAX_WIDTH;
if (fmt->height > IMX274_MAX_HEIGHT)
fmt->height = IMX274_MAX_HEIGHT;
fmt->width = fmt->width & (~IMX274_MASK_LSB_2_BITS);
fmt->height = fmt->height & (~IMX274_MASK_LSB_2_BITS);
fmt->field = V4L2_FIELD_NONE;
if (format->which == V4L2_SUBDEV_FORMAT_TRY)
cfg->try_fmt = *fmt;
else
imx274->format = *fmt;
mutex_unlock(&imx274->lock);
return 0;
}
/**
* 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 interal 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, imx274->ctrls.exposure->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 = %d\n", __func__,
on ? "Stream Start" : "Stream Stop", imx274->mode_index);
mutex_lock(&imx274->lock);
if (on) {
/* load mode registers */
ret = imx274_mode_regs(imx274, imx274->mode_index);
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,
mode_table[IMX274_MODE_STOP_STREAM]);
if (ret)
goto fail;
}
mutex_unlock(&imx274->lock);
dev_dbg(&imx274->client->dev,
"%s : Done: mode = %d\n", __func__, imx274->mode_index);
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_FRAME_LENGTH_ADDR_3, &reg_val[0]);
if (err)
goto fail;
err = imx274_read_reg(priv, IMX274_FRAME_LENGTH_ADDR_2, &reg_val[1]);
if (err)
goto fail;
err = imx274_read_reg(priv, IMX274_FRAME_LENGTH_ADDR_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 < min_frame_len[priv->mode_index])
*frame_length = min_frame_len[priv->mode_index];
*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 < min_SHR[priv->mode_index])
*val = min_SHR[priv->mode_index];
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);
}
static inline void imx274_calculate_gain_regs(struct reg_8 regs[2], u16 gain)
{
regs->addr = IMX274_ANALOG_GAIN_ADDR_MSB;
regs->val = (gain >> IMX274_SHIFT_8_BITS) & IMX274_MASK_LSB_3_BITS;
(regs + 1)->addr = IMX274_ANALOG_GAIN_ADDR_LSB;
(regs + 1)->val = (gain) & IMX274_MASK_LSB_8_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)
{
struct reg_8 reg_list[2];
int err;
u32 gain, analog_gain, digital_gain, gain_reg;
int i;
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;
imx274_calculate_gain_regs(reg_list, (u16)gain_reg);
for (i = 0; i < ARRAY_SIZE(reg_list); i++) {
err = imx274_write_reg(priv, reg_list[i].addr,
reg_list[i].val);
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;
}
static inline void imx274_calculate_coarse_time_regs(struct reg_8 regs[2],
u32 coarse_time)
{
regs->addr = IMX274_COARSE_TIME_ADDR_MSB;
regs->val = (coarse_time >> IMX274_SHIFT_8_BITS)
& IMX274_MASK_LSB_8_BITS;
(regs + 1)->addr = IMX274_COARSE_TIME_ADDR_LSB;
(regs + 1)->val = (coarse_time) & IMX274_MASK_LSB_8_BITS;
}
/*
* 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)
{
struct reg_8 reg_list[2];
int err;
u32 coarse_time, frame_length;
int i;
coarse_time = *val;
/* convert exposure_time to appropriate SHR value */
err = imx274_clamp_coarse_time(priv, &coarse_time, &frame_length);
if (err)
goto fail;
/* prepare SHR registers */
imx274_calculate_coarse_time_regs(reg_list, coarse_time);
/* write to SHR registers */
for (i = 0; i < ARRAY_SIZE(reg_list); i++) {
err = imx274_write_reg(priv, reg_list[i].addr,
reg_list[i].val);
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
- nocpiop[priv->mode_index]) / 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 + nocpiop[priv->mode_index])
/ (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, "VFILP 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;
}
static inline void imx274_calculate_frame_length_regs(struct reg_8 regs[3],
u32 frame_length)
{
regs->addr = IMX274_FRAME_LENGTH_ADDR_1;
regs->val = (frame_length >> IMX274_SHIFT_16_BITS)
& IMX274_MASK_LSB_4_BITS;
(regs + 1)->addr = IMX274_FRAME_LENGTH_ADDR_2;
(regs + 1)->val = (frame_length >> IMX274_SHIFT_8_BITS)
& IMX274_MASK_LSB_8_BITS;
(regs + 2)->addr = IMX274_FRAME_LENGTH_ADDR_3;
(regs + 2)->val = (frame_length) & IMX274_MASK_LSB_8_BITS;
}
/*
* 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)
{
struct reg_8 reg_list[3];
int err;
u32 frame_length;
int i;
dev_dbg(&priv->client->dev, "%s : input length = %d\n",
__func__, val);
frame_length = (u32)val;
imx274_calculate_frame_length_regs(reg_list, frame_length);
for (i = 0; i < ARRAY_SIZE(reg_list); i++) {
err = imx274_write_reg(priv, reg_list[i].addr,
reg_list[i].val);
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 > max_frame_rate[priv->mode_index]) {
frame_interval.numerator = 1;
frame_interval.denominator =
max_frame_rate[priv->mode_index];
} 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,
};
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 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);
strlcpy(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;
}
/* initialize format */
imx274->mode_index = IMX274_MODE_3840X2160;
imx274->format.width = imx274_formats[0].size.width;
imx274->format.height = imx274_formats[0].size.height;
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;
/* 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, mode_table[IMX274_MODE_STOP_STREAM]);
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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