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path: root/drivers/media/i2c/ov8856.c
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-rw-r--r--drivers/media/i2c/ov8856.c1268
1 files changed, 1268 insertions, 0 deletions
diff --git a/drivers/media/i2c/ov8856.c b/drivers/media/i2c/ov8856.c
new file mode 100644
index 000000000000..dbf1095b9440
--- /dev/null
+++ b/drivers/media/i2c/ov8856.c
@@ -0,0 +1,1268 @@
+// 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");
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.