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linux/drivers/media/i2c/ov8856.c

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// SPDX-License-Identifier: GPL-2.0
// Copyright (c) 2019 Intel Corporation.
#include <asm/unaligned.h>
#include <linux/acpi.h>
#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/pm_runtime.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-device.h>
#include <media/v4l2-fwnode.h>
#define OV8856_REG_VALUE_08BIT 1
#define OV8856_REG_VALUE_16BIT 2
#define OV8856_REG_VALUE_24BIT 3
#define OV8856_LINK_FREQ_360MHZ 360000000ULL
#define OV8856_LINK_FREQ_180MHZ 180000000ULL
#define OV8856_SCLK 144000000ULL
#define OV8856_MCLK 19200000
#define OV8856_DATA_LANES 4
#define OV8856_RGB_DEPTH 10
#define OV8856_REG_CHIP_ID 0x300a
#define OV8856_CHIP_ID 0x00885a
#define OV8856_REG_MODE_SELECT 0x0100
#define OV8856_MODE_STANDBY 0x00
#define OV8856_MODE_STREAMING 0x01
/* vertical-timings from sensor */
#define OV8856_REG_VTS 0x380e
#define OV8856_VTS_MAX 0x7fff
/* horizontal-timings from sensor */
#define OV8856_REG_HTS 0x380c
/* Exposure controls from sensor */
#define OV8856_REG_EXPOSURE 0x3500
#define OV8856_EXPOSURE_MIN 6
#define OV8856_EXPOSURE_MAX_MARGIN 6
#define OV8856_EXPOSURE_STEP 1
/* Analog gain controls from sensor */
#define OV8856_REG_ANALOG_GAIN 0x3508
#define OV8856_ANAL_GAIN_MIN 128
#define OV8856_ANAL_GAIN_MAX 2047
#define OV8856_ANAL_GAIN_STEP 1
/* Digital gain controls from sensor */
#define OV8856_REG_MWB_R_GAIN 0x5019
#define OV8856_REG_MWB_G_GAIN 0x501b
#define OV8856_REG_MWB_B_GAIN 0x501d
#define OV8856_DGTL_GAIN_MIN 0
#define OV8856_DGTL_GAIN_MAX 4095
#define OV8856_DGTL_GAIN_STEP 1
#define OV8856_DGTL_GAIN_DEFAULT 1024
/* Test Pattern Control */
#define OV8856_REG_TEST_PATTERN 0x5e00
#define OV8856_TEST_PATTERN_ENABLE BIT(7)
#define OV8856_TEST_PATTERN_BAR_SHIFT 2
#define to_ov8856(_sd) container_of(_sd, struct ov8856, sd)
enum {
OV8856_LINK_FREQ_720MBPS,
OV8856_LINK_FREQ_360MBPS,
};
struct ov8856_reg {
u16 address;
u8 val;
};
struct ov8856_reg_list {
u32 num_of_regs;
const struct ov8856_reg *regs;
};
struct ov8856_link_freq_config {
const struct ov8856_reg_list reg_list;
};
struct ov8856_mode {
/* Frame width in pixels */
u32 width;
/* Frame height in pixels */
u32 height;
/* Horizontal timining size */
u32 hts;
/* Default vertical timining size */
u32 vts_def;
/* Min vertical timining size */
u32 vts_min;
/* Link frequency needed for this resolution */
u32 link_freq_index;
/* Sensor register settings for this resolution */
const struct ov8856_reg_list reg_list;
};
static const struct ov8856_reg mipi_data_rate_720mbps[] = {
{0x0103, 0x01},
{0x0100, 0x00},
{0x0302, 0x4b},
{0x0303, 0x01},
{0x030b, 0x02},
{0x030d, 0x4b},
{0x031e, 0x0c},
};
static const struct ov8856_reg mipi_data_rate_360mbps[] = {
{0x0103, 0x01},
{0x0100, 0x00},
{0x0302, 0x4b},
{0x0303, 0x03},
{0x030b, 0x02},
{0x030d, 0x4b},
{0x031e, 0x0c},
};
static const struct ov8856_reg mode_3280x2464_regs[] = {
{0x3000, 0x20},
{0x3003, 0x08},
{0x300e, 0x20},
{0x3010, 0x00},
{0x3015, 0x84},
{0x3018, 0x72},
{0x3021, 0x23},
{0x3033, 0x24},
{0x3500, 0x00},
{0x3501, 0x9a},
{0x3502, 0x20},
{0x3503, 0x08},
{0x3505, 0x83},
{0x3508, 0x01},
{0x3509, 0x80},
{0x350c, 0x00},
{0x350d, 0x80},
{0x350e, 0x04},
{0x350f, 0x00},
{0x3510, 0x00},
{0x3511, 0x02},
{0x3512, 0x00},
{0x3600, 0x72},
{0x3601, 0x40},
{0x3602, 0x30},
{0x3610, 0xc5},
{0x3611, 0x58},
{0x3612, 0x5c},
{0x3613, 0xca},
{0x3614, 0x20},
{0x3628, 0xff},
{0x3629, 0xff},
{0x362a, 0xff},
{0x3633, 0x10},
{0x3634, 0x10},
{0x3635, 0x10},
{0x3636, 0x10},
{0x3663, 0x08},
{0x3669, 0x34},
{0x366e, 0x10},
{0x3706, 0x86},
{0x370b, 0x7e},
{0x3714, 0x23},
{0x3730, 0x12},
{0x3733, 0x10},
{0x3764, 0x00},
{0x3765, 0x00},
{0x3769, 0x62},
{0x376a, 0x2a},
{0x376b, 0x30},
{0x3780, 0x00},
{0x3781, 0x24},
{0x3782, 0x00},
{0x3783, 0x23},
{0x3798, 0x2f},
{0x37a1, 0x60},
{0x37a8, 0x6a},
{0x37ab, 0x3f},
{0x37c2, 0x04},
{0x37c3, 0xf1},
{0x37c9, 0x80},
{0x37cb, 0x16},
{0x37cc, 0x16},
{0x37cd, 0x16},
{0x37ce, 0x16},
{0x3800, 0x00},
{0x3801, 0x00},
{0x3802, 0x00},
{0x3803, 0x07},
{0x3804, 0x0c},
{0x3805, 0xdf},
{0x3806, 0x09},
{0x3807, 0xa6},
{0x3808, 0x0c},
{0x3809, 0xd0},
{0x380a, 0x09},
{0x380b, 0xa0},
{0x380c, 0x07},
{0x380d, 0x88},
{0x380e, 0x09},
{0x380f, 0xb8},
{0x3810, 0x00},
{0x3811, 0x00},
{0x3812, 0x00},
{0x3813, 0x00},
{0x3814, 0x01},
{0x3815, 0x01},
{0x3816, 0x00},
{0x3817, 0x00},
{0x3818, 0x00},
{0x3819, 0x10},
{0x3820, 0x80},
{0x3821, 0x46},
{0x382a, 0x01},
{0x382b, 0x01},
{0x3830, 0x06},
{0x3836, 0x02},
{0x3862, 0x04},
{0x3863, 0x08},
{0x3cc0, 0x33},
{0x3d85, 0x17},
{0x3d8c, 0x73},
{0x3d8d, 0xde},
{0x4001, 0xe0},
{0x4003, 0x40},
{0x4008, 0x00},
{0x4009, 0x0b},
{0x400a, 0x00},
{0x400b, 0x84},
{0x400f, 0x80},
{0x4010, 0xf0},
{0x4011, 0xff},
{0x4012, 0x02},
{0x4013, 0x01},
{0x4014, 0x01},
{0x4015, 0x01},
{0x4042, 0x00},
{0x4043, 0x80},
{0x4044, 0x00},
{0x4045, 0x80},
{0x4046, 0x00},
{0x4047, 0x80},
{0x4048, 0x00},
{0x4049, 0x80},
{0x4041, 0x03},
{0x404c, 0x20},
{0x404d, 0x00},
{0x404e, 0x20},
{0x4203, 0x80},
{0x4307, 0x30},
{0x4317, 0x00},
{0x4503, 0x08},
{0x4601, 0x80},
{0x4800, 0x44},
{0x4816, 0x53},
{0x481b, 0x58},
{0x481f, 0x27},
{0x4837, 0x16},
{0x483c, 0x0f},
{0x484b, 0x05},
{0x5000, 0x57},
{0x5001, 0x0a},
{0x5004, 0x04},
{0x502e, 0x03},
{0x5030, 0x41},
{0x5780, 0x14},
{0x5781, 0x0f},
{0x5782, 0x44},
{0x5783, 0x02},
{0x5784, 0x01},
{0x5785, 0x01},
{0x5786, 0x00},
{0x5787, 0x04},
{0x5788, 0x02},
{0x5789, 0x0f},
{0x578a, 0xfd},
{0x578b, 0xf5},
{0x578c, 0xf5},
{0x578d, 0x03},
{0x578e, 0x08},
{0x578f, 0x0c},
{0x5790, 0x08},
{0x5791, 0x04},
{0x5792, 0x00},
{0x5793, 0x52},
{0x5794, 0xa3},
{0x5795, 0x02},
{0x5796, 0x20},
{0x5797, 0x20},
{0x5798, 0xd5},
{0x5799, 0xd5},
{0x579a, 0x00},
{0x579b, 0x50},
{0x579c, 0x00},
{0x579d, 0x2c},
{0x579e, 0x0c},
{0x579f, 0x40},
{0x57a0, 0x09},
{0x57a1, 0x40},
{0x59f8, 0x3d},
{0x5a08, 0x02},
{0x5b00, 0x02},
{0x5b01, 0x10},
{0x5b02, 0x03},
{0x5b03, 0xcf},
{0x5b05, 0x6c},
{0x5e00, 0x00}
};
static const struct ov8856_reg mode_1640x1232_regs[] = {
{0x3000, 0x20},
{0x3003, 0x08},
{0x300e, 0x20},
{0x3010, 0x00},
{0x3015, 0x84},
{0x3018, 0x72},
{0x3021, 0x23},
{0x3033, 0x24},
{0x3500, 0x00},
{0x3501, 0x4c},
{0x3502, 0xe0},
{0x3503, 0x08},
{0x3505, 0x83},
{0x3508, 0x01},
{0x3509, 0x80},
{0x350c, 0x00},
{0x350d, 0x80},
{0x350e, 0x04},
{0x350f, 0x00},
{0x3510, 0x00},
{0x3511, 0x02},
{0x3512, 0x00},
{0x3600, 0x72},
{0x3601, 0x40},
{0x3602, 0x30},
{0x3610, 0xc5},
{0x3611, 0x58},
{0x3612, 0x5c},
{0x3613, 0xca},
{0x3614, 0x20},
{0x3628, 0xff},
{0x3629, 0xff},
{0x362a, 0xff},
{0x3633, 0x10},
{0x3634, 0x10},
{0x3635, 0x10},
{0x3636, 0x10},
{0x3663, 0x08},
{0x3669, 0x34},
{0x366e, 0x08},
{0x3706, 0x86},
{0x370b, 0x7e},
{0x3714, 0x27},
{0x3730, 0x12},
{0x3733, 0x10},
{0x3764, 0x00},
{0x3765, 0x00},
{0x3769, 0x62},
{0x376a, 0x2a},
{0x376b, 0x30},
{0x3780, 0x00},
{0x3781, 0x24},
{0x3782, 0x00},
{0x3783, 0x23},
{0x3798, 0x2f},
{0x37a1, 0x60},
{0x37a8, 0x6a},
{0x37ab, 0x3f},
{0x37c2, 0x14},
{0x37c3, 0xf1},
{0x37c9, 0x80},
{0x37cb, 0x16},
{0x37cc, 0x16},
{0x37cd, 0x16},
{0x37ce, 0x16},
{0x3800, 0x00},
{0x3801, 0x00},
{0x3802, 0x00},
{0x3803, 0x07},
{0x3804, 0x0c},
{0x3805, 0xdf},
{0x3806, 0x09},
{0x3807, 0xa6},
{0x3808, 0x06},
{0x3809, 0x68},
{0x380a, 0x04},
{0x380b, 0xd0},
{0x380c, 0x0e},
{0x380d, 0xec},
{0x380e, 0x04},
{0x380f, 0xe8},
{0x3810, 0x00},
{0x3811, 0x00},
{0x3812, 0x00},
{0x3813, 0x00},
{0x3814, 0x03},
{0x3815, 0x01},
{0x3816, 0x00},
{0x3817, 0x00},
{0x3818, 0x00},
{0x3819, 0x10},
{0x3820, 0x90},
{0x3821, 0x67},
{0x382a, 0x03},
{0x382b, 0x01},
{0x3830, 0x06},
{0x3836, 0x02},
{0x3862, 0x04},
{0x3863, 0x08},
{0x3cc0, 0x33},
{0x3d85, 0x17},
{0x3d8c, 0x73},
{0x3d8d, 0xde},
{0x4001, 0xe0},
{0x4003, 0x40},
{0x4008, 0x00},
{0x4009, 0x05},
{0x400a, 0x00},
{0x400b, 0x84},
{0x400f, 0x80},
{0x4010, 0xf0},
{0x4011, 0xff},
{0x4012, 0x02},
{0x4013, 0x01},
{0x4014, 0x01},
{0x4015, 0x01},
{0x4042, 0x00},
{0x4043, 0x80},
{0x4044, 0x00},
{0x4045, 0x80},
{0x4046, 0x00},
{0x4047, 0x80},
{0x4048, 0x00},
{0x4049, 0x80},
{0x4041, 0x03},
{0x404c, 0x20},
{0x404d, 0x00},
{0x404e, 0x20},
{0x4203, 0x80},
{0x4307, 0x30},
{0x4317, 0x00},
{0x4503, 0x08},
{0x4601, 0x80},
{0x4800, 0x44},
{0x4816, 0x53},
{0x481b, 0x58},
{0x481f, 0x27},
{0x4837, 0x16},
{0x483c, 0x0f},
{0x484b, 0x05},
{0x5000, 0x57},
{0x5001, 0x0a},
{0x5004, 0x04},
{0x502e, 0x03},
{0x5030, 0x41},
{0x5780, 0x14},
{0x5781, 0x0f},
{0x5782, 0x44},
{0x5783, 0x02},
{0x5784, 0x01},
{0x5785, 0x01},
{0x5786, 0x00},
{0x5787, 0x04},
{0x5788, 0x02},
{0x5789, 0x0f},
{0x578a, 0xfd},
{0x578b, 0xf5},
{0x578c, 0xf5},
{0x578d, 0x03},
{0x578e, 0x08},
{0x578f, 0x0c},
{0x5790, 0x08},
{0x5791, 0x04},
{0x5792, 0x00},
{0x5793, 0x52},
{0x5794, 0xa3},
{0x5795, 0x00},
{0x5796, 0x10},
{0x5797, 0x10},
{0x5798, 0x73},
{0x5799, 0x73},
{0x579a, 0x00},
{0x579b, 0x28},
{0x579c, 0x00},
{0x579d, 0x16},
{0x579e, 0x06},
{0x579f, 0x20},
{0x57a0, 0x04},
{0x57a1, 0xa0},
{0x59f8, 0x3d},
{0x5a08, 0x02},
{0x5b00, 0x02},
{0x5b01, 0x10},
{0x5b02, 0x03},
{0x5b03, 0xcf},
{0x5b05, 0x6c},
{0x5e00, 0x00}
};
static const char * const ov8856_test_pattern_menu[] = {
"Disabled",
"Standard Color Bar",
"Top-Bottom Darker Color Bar",
"Right-Left Darker Color Bar",
"Bottom-Top Darker Color Bar"
};
static const s64 link_freq_menu_items[] = {
OV8856_LINK_FREQ_360MHZ,
OV8856_LINK_FREQ_180MHZ
};
static const struct ov8856_link_freq_config link_freq_configs[] = {
[OV8856_LINK_FREQ_720MBPS] = {
.reg_list = {
.num_of_regs = ARRAY_SIZE(mipi_data_rate_720mbps),
.regs = mipi_data_rate_720mbps,
}
},
[OV8856_LINK_FREQ_360MBPS] = {
.reg_list = {
.num_of_regs = ARRAY_SIZE(mipi_data_rate_360mbps),
.regs = mipi_data_rate_360mbps,
}
}
};
static const struct ov8856_mode supported_modes[] = {
{
.width = 3280,
.height = 2464,
.hts = 1928,
.vts_def = 2488,
.vts_min = 2488,
.reg_list = {
.num_of_regs = ARRAY_SIZE(mode_3280x2464_regs),
.regs = mode_3280x2464_regs,
},
.link_freq_index = OV8856_LINK_FREQ_720MBPS,
},
{
.width = 1640,
.height = 1232,
.hts = 3820,
.vts_def = 1256,
.vts_min = 1256,
.reg_list = {
.num_of_regs = ARRAY_SIZE(mode_1640x1232_regs),
.regs = mode_1640x1232_regs,
},
.link_freq_index = OV8856_LINK_FREQ_360MBPS,
}
};
struct ov8856 {
struct v4l2_subdev sd;
struct media_pad pad;
struct v4l2_ctrl_handler ctrl_handler;
/* V4L2 Controls */
struct v4l2_ctrl *link_freq;
struct v4l2_ctrl *pixel_rate;
struct v4l2_ctrl *vblank;
struct v4l2_ctrl *hblank;
struct v4l2_ctrl *exposure;
/* Current mode */
const struct ov8856_mode *cur_mode;
/* To serialize asynchronus callbacks */
struct mutex mutex;
/* Streaming on/off */
bool streaming;
};
static u64 to_pixel_rate(u32 f_index)
{
u64 pixel_rate = link_freq_menu_items[f_index] * 2 * OV8856_DATA_LANES;
do_div(pixel_rate, OV8856_RGB_DEPTH);
return pixel_rate;
}
static u64 to_pixels_per_line(u32 hts, u32 f_index)
{
u64 ppl = hts * to_pixel_rate(f_index);
do_div(ppl, OV8856_SCLK);
return ppl;
}
static int ov8856_read_reg(struct ov8856 *ov8856, u16 reg, u16 len, u32 *val)
{
struct i2c_client *client = v4l2_get_subdevdata(&ov8856->sd);
struct i2c_msg msgs[2];
u8 addr_buf[2];
u8 data_buf[4] = {0};
int ret;
if (len > 4)
return -EINVAL;
put_unaligned_be16(reg, addr_buf);
msgs[0].addr = client->addr;
msgs[0].flags = 0;
msgs[0].len = sizeof(addr_buf);
msgs[0].buf = addr_buf;
msgs[1].addr = client->addr;
msgs[1].flags = I2C_M_RD;
msgs[1].len = len;
msgs[1].buf = &data_buf[4 - len];
ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
if (ret != ARRAY_SIZE(msgs))
return -EIO;
*val = get_unaligned_be32(data_buf);
return 0;
}
static int ov8856_write_reg(struct ov8856 *ov8856, u16 reg, u16 len, u32 val)
{
struct i2c_client *client = v4l2_get_subdevdata(&ov8856->sd);
u8 buf[6];
if (len > 4)
return -EINVAL;
put_unaligned_be16(reg, buf);
put_unaligned_be32(val << 8 * (4 - len), buf + 2);
if (i2c_master_send(client, buf, len + 2) != len + 2)
return -EIO;
return 0;
}
static int ov8856_write_reg_list(struct ov8856 *ov8856,
const struct ov8856_reg_list *r_list)
{
struct i2c_client *client = v4l2_get_subdevdata(&ov8856->sd);
unsigned int i;
int ret;
for (i = 0; i < r_list->num_of_regs; i++) {
ret = ov8856_write_reg(ov8856, r_list->regs[i].address, 1,
r_list->regs[i].val);
if (ret) {
dev_err_ratelimited(&client->dev,
"failed to write reg 0x%4.4x. error = %d",
r_list->regs[i].address, ret);
return ret;
}
}
return 0;
}
static int ov8856_update_digital_gain(struct ov8856 *ov8856, u32 d_gain)
{
int ret;
ret = ov8856_write_reg(ov8856, OV8856_REG_MWB_R_GAIN,
OV8856_REG_VALUE_16BIT, d_gain);
if (ret)
return ret;
ret = ov8856_write_reg(ov8856, OV8856_REG_MWB_G_GAIN,
OV8856_REG_VALUE_16BIT, d_gain);
if (ret)
return ret;
return ov8856_write_reg(ov8856, OV8856_REG_MWB_B_GAIN,
OV8856_REG_VALUE_16BIT, d_gain);
}
static int ov8856_test_pattern(struct ov8856 *ov8856, u32 pattern)
{
if (pattern)
pattern = (pattern - 1) << OV8856_TEST_PATTERN_BAR_SHIFT |
OV8856_TEST_PATTERN_ENABLE;
return ov8856_write_reg(ov8856, OV8856_REG_TEST_PATTERN,
OV8856_REG_VALUE_08BIT, pattern);
}
static int ov8856_set_ctrl(struct v4l2_ctrl *ctrl)
{
struct ov8856 *ov8856 = container_of(ctrl->handler,
struct ov8856, ctrl_handler);
struct i2c_client *client = v4l2_get_subdevdata(&ov8856->sd);
s64 exposure_max;
int ret = 0;
/* Propagate change of current control to all related controls */
if (ctrl->id == V4L2_CID_VBLANK) {
/* Update max exposure while meeting expected vblanking */
exposure_max = ov8856->cur_mode->height + ctrl->val -
OV8856_EXPOSURE_MAX_MARGIN;
__v4l2_ctrl_modify_range(ov8856->exposure,
ov8856->exposure->minimum,
exposure_max, ov8856->exposure->step,
exposure_max);
}
/* V4L2 controls values will be applied only when power is already up */
if (!pm_runtime_get_if_in_use(&client->dev))
return 0;
switch (ctrl->id) {
case V4L2_CID_ANALOGUE_GAIN:
ret = ov8856_write_reg(ov8856, OV8856_REG_ANALOG_GAIN,
OV8856_REG_VALUE_16BIT, ctrl->val);
break;
case V4L2_CID_DIGITAL_GAIN:
ret = ov8856_update_digital_gain(ov8856, ctrl->val);
break;
case V4L2_CID_EXPOSURE:
/* 4 least significant bits of expsoure are fractional part */
ret = ov8856_write_reg(ov8856, OV8856_REG_EXPOSURE,
OV8856_REG_VALUE_24BIT, ctrl->val << 4);
break;
case V4L2_CID_VBLANK:
ret = ov8856_write_reg(ov8856, OV8856_REG_VTS,
OV8856_REG_VALUE_16BIT,
ov8856->cur_mode->height + ctrl->val);
break;
case V4L2_CID_TEST_PATTERN:
ret = ov8856_test_pattern(ov8856, ctrl->val);
break;
default:
ret = -EINVAL;
break;
}
pm_runtime_put(&client->dev);
return ret;
}
static const struct v4l2_ctrl_ops ov8856_ctrl_ops = {
.s_ctrl = ov8856_set_ctrl,
};
static int ov8856_init_controls(struct ov8856 *ov8856)
{
struct v4l2_ctrl_handler *ctrl_hdlr;
s64 exposure_max, h_blank;
int ret;
ctrl_hdlr = &ov8856->ctrl_handler;
ret = v4l2_ctrl_handler_init(ctrl_hdlr, 8);
if (ret)
return ret;
ctrl_hdlr->lock = &ov8856->mutex;
ov8856->link_freq = v4l2_ctrl_new_int_menu(ctrl_hdlr, &ov8856_ctrl_ops,
V4L2_CID_LINK_FREQ,
ARRAY_SIZE(link_freq_menu_items) - 1,
0, link_freq_menu_items);
if (ov8856->link_freq)
ov8856->link_freq->flags |= V4L2_CTRL_FLAG_READ_ONLY;
ov8856->pixel_rate = v4l2_ctrl_new_std(ctrl_hdlr, &ov8856_ctrl_ops,
V4L2_CID_PIXEL_RATE, 0,
to_pixel_rate(OV8856_LINK_FREQ_720MBPS),
1,
to_pixel_rate(OV8856_LINK_FREQ_720MBPS));
ov8856->vblank = v4l2_ctrl_new_std(ctrl_hdlr, &ov8856_ctrl_ops,
V4L2_CID_VBLANK,
ov8856->cur_mode->vts_min - ov8856->cur_mode->height,
OV8856_VTS_MAX - ov8856->cur_mode->height, 1,
ov8856->cur_mode->vts_def - ov8856->cur_mode->height);
h_blank = to_pixels_per_line(ov8856->cur_mode->hts,
ov8856->cur_mode->link_freq_index) - ov8856->cur_mode->width;
ov8856->hblank = v4l2_ctrl_new_std(ctrl_hdlr, &ov8856_ctrl_ops,
V4L2_CID_HBLANK, h_blank, h_blank, 1,
h_blank);
if (ov8856->hblank)
ov8856->hblank->flags |= V4L2_CTRL_FLAG_READ_ONLY;
v4l2_ctrl_new_std(ctrl_hdlr, &ov8856_ctrl_ops, V4L2_CID_ANALOGUE_GAIN,
OV8856_ANAL_GAIN_MIN, OV8856_ANAL_GAIN_MAX,
OV8856_ANAL_GAIN_STEP, OV8856_ANAL_GAIN_MIN);
v4l2_ctrl_new_std(ctrl_hdlr, &ov8856_ctrl_ops, V4L2_CID_DIGITAL_GAIN,
OV8856_DGTL_GAIN_MIN, OV8856_DGTL_GAIN_MAX,
OV8856_DGTL_GAIN_STEP, OV8856_DGTL_GAIN_DEFAULT);
exposure_max = ov8856->cur_mode->vts_def - OV8856_EXPOSURE_MAX_MARGIN;
ov8856->exposure = v4l2_ctrl_new_std(ctrl_hdlr, &ov8856_ctrl_ops,
V4L2_CID_EXPOSURE,
OV8856_EXPOSURE_MIN, exposure_max,
OV8856_EXPOSURE_STEP,
exposure_max);
v4l2_ctrl_new_std_menu_items(ctrl_hdlr, &ov8856_ctrl_ops,
V4L2_CID_TEST_PATTERN,
ARRAY_SIZE(ov8856_test_pattern_menu) - 1,
0, 0, ov8856_test_pattern_menu);
if (ctrl_hdlr->error)
return ctrl_hdlr->error;
ov8856->sd.ctrl_handler = ctrl_hdlr;
return 0;
}
static void ov8856_update_pad_format(const struct ov8856_mode *mode,
struct v4l2_mbus_framefmt *fmt)
{
fmt->width = mode->width;
fmt->height = mode->height;
fmt->code = MEDIA_BUS_FMT_SGRBG10_1X10;
fmt->field = V4L2_FIELD_NONE;
}
static int ov8856_start_streaming(struct ov8856 *ov8856)
{
struct i2c_client *client = v4l2_get_subdevdata(&ov8856->sd);
const struct ov8856_reg_list *reg_list;
int link_freq_index, ret;
link_freq_index = ov8856->cur_mode->link_freq_index;
reg_list = &link_freq_configs[link_freq_index].reg_list;
ret = ov8856_write_reg_list(ov8856, reg_list);
if (ret) {
dev_err(&client->dev, "failed to set plls");
return ret;
}
reg_list = &ov8856->cur_mode->reg_list;
ret = ov8856_write_reg_list(ov8856, reg_list);
if (ret) {
dev_err(&client->dev, "failed to set mode");
return ret;
}
ret = __v4l2_ctrl_handler_setup(ov8856->sd.ctrl_handler);
if (ret)
return ret;
ret = ov8856_write_reg(ov8856, OV8856_REG_MODE_SELECT,
OV8856_REG_VALUE_08BIT, OV8856_MODE_STREAMING);
if (ret) {
dev_err(&client->dev, "failed to set stream");
return ret;
}
return 0;
}
static void ov8856_stop_streaming(struct ov8856 *ov8856)
{
struct i2c_client *client = v4l2_get_subdevdata(&ov8856->sd);
if (ov8856_write_reg(ov8856, OV8856_REG_MODE_SELECT,
OV8856_REG_VALUE_08BIT, OV8856_MODE_STANDBY))
dev_err(&client->dev, "failed to set stream");
}
static int ov8856_set_stream(struct v4l2_subdev *sd, int enable)
{
struct ov8856 *ov8856 = to_ov8856(sd);
struct i2c_client *client = v4l2_get_subdevdata(sd);
int ret = 0;
if (ov8856->streaming == enable)
return 0;
mutex_lock(&ov8856->mutex);
if (enable) {
ret = pm_runtime_get_sync(&client->dev);
if (ret < 0) {
pm_runtime_put_noidle(&client->dev);
mutex_unlock(&ov8856->mutex);
return ret;
}
ret = ov8856_start_streaming(ov8856);
if (ret) {
enable = 0;
ov8856_stop_streaming(ov8856);
pm_runtime_put(&client->dev);
}
} else {
ov8856_stop_streaming(ov8856);
pm_runtime_put(&client->dev);
}
ov8856->streaming = enable;
mutex_unlock(&ov8856->mutex);
return ret;
}
static int __maybe_unused ov8856_suspend(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct v4l2_subdev *sd = i2c_get_clientdata(client);
struct ov8856 *ov8856 = to_ov8856(sd);
mutex_lock(&ov8856->mutex);
if (ov8856->streaming)
ov8856_stop_streaming(ov8856);
mutex_unlock(&ov8856->mutex);
return 0;
}
static int __maybe_unused ov8856_resume(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct v4l2_subdev *sd = i2c_get_clientdata(client);
struct ov8856 *ov8856 = to_ov8856(sd);
int ret;
mutex_lock(&ov8856->mutex);
if (ov8856->streaming) {
ret = ov8856_start_streaming(ov8856);
if (ret) {
ov8856->streaming = false;
ov8856_stop_streaming(ov8856);
mutex_unlock(&ov8856->mutex);
return ret;
}
}
mutex_unlock(&ov8856->mutex);
return 0;
}
static int ov8856_set_format(struct v4l2_subdev *sd,
struct v4l2_subdev_pad_config *cfg,
struct v4l2_subdev_format *fmt)
{
struct ov8856 *ov8856 = to_ov8856(sd);
const struct ov8856_mode *mode;
s32 vblank_def, h_blank;
mode = v4l2_find_nearest_size(supported_modes,
ARRAY_SIZE(supported_modes), width,
height, fmt->format.width,
fmt->format.height);
mutex_lock(&ov8856->mutex);
ov8856_update_pad_format(mode, &fmt->format);
if (fmt->which == V4L2_SUBDEV_FORMAT_TRY) {
*v4l2_subdev_get_try_format(sd, cfg, fmt->pad) = fmt->format;
} else {
ov8856->cur_mode = mode;
__v4l2_ctrl_s_ctrl(ov8856->link_freq, mode->link_freq_index);
__v4l2_ctrl_s_ctrl_int64(ov8856->pixel_rate,
to_pixel_rate(mode->link_freq_index));
/* Update limits and set FPS to default */
vblank_def = mode->vts_def - mode->height;
__v4l2_ctrl_modify_range(ov8856->vblank,
mode->vts_min - mode->height,
OV8856_VTS_MAX - mode->height, 1,
vblank_def);
__v4l2_ctrl_s_ctrl(ov8856->vblank, vblank_def);
h_blank = to_pixels_per_line(mode->hts, mode->link_freq_index) -
mode->width;
__v4l2_ctrl_modify_range(ov8856->hblank, h_blank, h_blank, 1,
h_blank);
}
mutex_unlock(&ov8856->mutex);
return 0;
}
static int ov8856_get_format(struct v4l2_subdev *sd,
struct v4l2_subdev_pad_config *cfg,
struct v4l2_subdev_format *fmt)
{
struct ov8856 *ov8856 = to_ov8856(sd);
mutex_lock(&ov8856->mutex);
if (fmt->which == V4L2_SUBDEV_FORMAT_TRY)
fmt->format = *v4l2_subdev_get_try_format(&ov8856->sd, cfg,
fmt->pad);
else
ov8856_update_pad_format(ov8856->cur_mode, &fmt->format);
mutex_unlock(&ov8856->mutex);
return 0;
}
static int ov8856_enum_mbus_code(struct v4l2_subdev *sd,
struct v4l2_subdev_pad_config *cfg,
struct v4l2_subdev_mbus_code_enum *code)
{
/* Only one bayer order GRBG is supported */
if (code->index > 0)
return -EINVAL;
code->code = MEDIA_BUS_FMT_SGRBG10_1X10;
return 0;
}
static int ov8856_enum_frame_size(struct v4l2_subdev *sd,
struct v4l2_subdev_pad_config *cfg,
struct v4l2_subdev_frame_size_enum *fse)
{
if (fse->index >= ARRAY_SIZE(supported_modes))
return -EINVAL;
if (fse->code != MEDIA_BUS_FMT_SGRBG10_1X10)
return -EINVAL;
fse->min_width = supported_modes[fse->index].width;
fse->max_width = fse->min_width;
fse->min_height = supported_modes[fse->index].height;
fse->max_height = fse->min_height;
return 0;
}
static int ov8856_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
{
struct ov8856 *ov8856 = to_ov8856(sd);
mutex_lock(&ov8856->mutex);
ov8856_update_pad_format(&supported_modes[0],
v4l2_subdev_get_try_format(sd, fh->pad, 0));
mutex_unlock(&ov8856->mutex);
return 0;
}
static const struct v4l2_subdev_video_ops ov8856_video_ops = {
.s_stream = ov8856_set_stream,
};
static const struct v4l2_subdev_pad_ops ov8856_pad_ops = {
.set_fmt = ov8856_set_format,
.get_fmt = ov8856_get_format,
.enum_mbus_code = ov8856_enum_mbus_code,
.enum_frame_size = ov8856_enum_frame_size,
};
static const struct v4l2_subdev_ops ov8856_subdev_ops = {
.video = &ov8856_video_ops,
.pad = &ov8856_pad_ops,
};
static const struct media_entity_operations ov8856_subdev_entity_ops = {
.link_validate = v4l2_subdev_link_validate,
};
static const struct v4l2_subdev_internal_ops ov8856_internal_ops = {
.open = ov8856_open,
};
static int ov8856_identify_module(struct ov8856 *ov8856)
{
struct i2c_client *client = v4l2_get_subdevdata(&ov8856->sd);
int ret;
u32 val;
ret = ov8856_read_reg(ov8856, OV8856_REG_CHIP_ID,
OV8856_REG_VALUE_24BIT, &val);
if (ret)
return ret;
if (val != OV8856_CHIP_ID) {
dev_err(&client->dev, "chip id mismatch: %x!=%x",
OV8856_CHIP_ID, val);
return -ENXIO;
}
return 0;
}
static int ov8856_check_hwcfg(struct device *dev)
{
struct fwnode_handle *ep;
struct fwnode_handle *fwnode = dev_fwnode(dev);
struct v4l2_fwnode_endpoint bus_cfg = {
.bus_type = V4L2_MBUS_CSI2_DPHY
};
u32 mclk;
int ret;
unsigned int i, j;
if (!fwnode)
return -ENXIO;
fwnode_property_read_u32(fwnode, "clock-frequency", &mclk);
if (mclk != OV8856_MCLK) {
dev_err(dev, "external clock %d is not supported", mclk);
return -EINVAL;
}
ep = fwnode_graph_get_next_endpoint(fwnode, NULL);
if (!ep)
return -ENXIO;
ret = v4l2_fwnode_endpoint_alloc_parse(ep, &bus_cfg);
fwnode_handle_put(ep);
if (ret)
return ret;
if (bus_cfg.bus.mipi_csi2.num_data_lanes != OV8856_DATA_LANES) {
dev_err(dev, "number of CSI2 data lanes %d is not supported",
bus_cfg.bus.mipi_csi2.num_data_lanes);
ret = -EINVAL;
goto check_hwcfg_error;
}
if (!bus_cfg.nr_of_link_frequencies) {
dev_err(dev, "no link frequencies defined");
ret = -EINVAL;
goto check_hwcfg_error;
}
for (i = 0; i < ARRAY_SIZE(link_freq_menu_items); i++) {
for (j = 0; j < bus_cfg.nr_of_link_frequencies; j++) {
if (link_freq_menu_items[i] ==
bus_cfg.link_frequencies[j])
break;
}
if (j == bus_cfg.nr_of_link_frequencies) {
dev_err(dev, "no link frequency %lld supported",
link_freq_menu_items[i]);
ret = -EINVAL;
goto check_hwcfg_error;
}
}
check_hwcfg_error:
v4l2_fwnode_endpoint_free(&bus_cfg);
return ret;
}
static int ov8856_remove(struct i2c_client *client)
{
struct v4l2_subdev *sd = i2c_get_clientdata(client);
struct ov8856 *ov8856 = to_ov8856(sd);
v4l2_async_unregister_subdev(sd);
media_entity_cleanup(&sd->entity);
v4l2_ctrl_handler_free(sd->ctrl_handler);
pm_runtime_disable(&client->dev);
mutex_destroy(&ov8856->mutex);
return 0;
}
static int ov8856_probe(struct i2c_client *client)
{
struct ov8856 *ov8856;
int ret;
ret = ov8856_check_hwcfg(&client->dev);
if (ret) {
dev_err(&client->dev, "failed to check HW configuration: %d",
ret);
return ret;
}
ov8856 = devm_kzalloc(&client->dev, sizeof(*ov8856), GFP_KERNEL);
if (!ov8856)
return -ENOMEM;
v4l2_i2c_subdev_init(&ov8856->sd, client, &ov8856_subdev_ops);
ret = ov8856_identify_module(ov8856);
if (ret) {
dev_err(&client->dev, "failed to find sensor: %d", ret);
return ret;
}
mutex_init(&ov8856->mutex);
ov8856->cur_mode = &supported_modes[0];
ret = ov8856_init_controls(ov8856);
if (ret) {
dev_err(&client->dev, "failed to init controls: %d", ret);
goto probe_error_v4l2_ctrl_handler_free;
}
ov8856->sd.internal_ops = &ov8856_internal_ops;
ov8856->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
ov8856->sd.entity.ops = &ov8856_subdev_entity_ops;
ov8856->sd.entity.function = MEDIA_ENT_F_CAM_SENSOR;
ov8856->pad.flags = MEDIA_PAD_FL_SOURCE;
ret = media_entity_pads_init(&ov8856->sd.entity, 1, &ov8856->pad);
if (ret) {
dev_err(&client->dev, "failed to init entity pads: %d", ret);
goto probe_error_v4l2_ctrl_handler_free;
}
ret = v4l2_async_register_subdev_sensor_common(&ov8856->sd);
if (ret < 0) {
dev_err(&client->dev, "failed to register V4L2 subdev: %d",
ret);
goto probe_error_media_entity_cleanup;
}
/*
* Device is already turned on by i2c-core with ACPI domain PM.
* Enable runtime PM and turn off the device.
*/
pm_runtime_set_active(&client->dev);
pm_runtime_enable(&client->dev);
pm_runtime_idle(&client->dev);
return 0;
probe_error_media_entity_cleanup:
media_entity_cleanup(&ov8856->sd.entity);
probe_error_v4l2_ctrl_handler_free:
v4l2_ctrl_handler_free(ov8856->sd.ctrl_handler);
mutex_destroy(&ov8856->mutex);
return ret;
}
static const struct dev_pm_ops ov8856_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(ov8856_suspend, ov8856_resume)
};
#ifdef CONFIG_ACPI
static const struct acpi_device_id ov8856_acpi_ids[] = {
{"OVTI8856"},
{}
};
MODULE_DEVICE_TABLE(acpi, ov8856_acpi_ids);
#endif
static struct i2c_driver ov8856_i2c_driver = {
.driver = {
.name = "ov8856",
.pm = &ov8856_pm_ops,
.acpi_match_table = ACPI_PTR(ov8856_acpi_ids),
},
.probe_new = ov8856_probe,
.remove = ov8856_remove,
};
module_i2c_driver(ov8856_i2c_driver);
MODULE_AUTHOR("Ben Kao <ben.kao@intel.com>");
MODULE_DESCRIPTION("OmniVision OV8856 sensor driver");
MODULE_LICENSE("GPL v2");
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