// SPDX-License-Identifier: GPL-2.0 /* * Omnivision OV2680 CMOS Image Sensor driver * * Copyright (C) 2018 Linaro Ltd * * Based on OV5640 Sensor Driver * Copyright (C) 2011-2013 Freescale Semiconductor, Inc. All Rights Reserved. * Copyright (C) 2014-2017 Mentor Graphics Inc. * */ #include #include #include #include #include #include #include #include #include #include #include #include #include #define OV2680_XVCLK_VALUE 24000000 #define OV2680_CHIP_ID 0x2680 #define OV2680_REG_STREAM_CTRL 0x0100 #define OV2680_REG_SOFT_RESET 0x0103 #define OV2680_REG_CHIP_ID_HIGH 0x300a #define OV2680_REG_CHIP_ID_LOW 0x300b #define OV2680_REG_R_MANUAL 0x3503 #define OV2680_REG_GAIN_PK 0x350a #define OV2680_REG_EXPOSURE_PK_HIGH 0x3500 #define OV2680_REG_TIMING_HTS 0x380c #define OV2680_REG_TIMING_VTS 0x380e #define OV2680_REG_FORMAT1 0x3820 #define OV2680_REG_FORMAT2 0x3821 #define OV2680_REG_ISP_CTRL00 0x5080 #define OV2680_FRAME_RATE 30 #define OV2680_REG_VALUE_8BIT 1 #define OV2680_REG_VALUE_16BIT 2 #define OV2680_REG_VALUE_24BIT 3 #define OV2680_WIDTH_MAX 1600 #define OV2680_HEIGHT_MAX 1200 enum ov2680_mode_id { OV2680_MODE_QUXGA_800_600, OV2680_MODE_720P_1280_720, OV2680_MODE_UXGA_1600_1200, OV2680_MODE_MAX, }; struct reg_value { u16 reg_addr; u8 val; }; static const char * const ov2680_supply_name[] = { "DOVDD", "DVDD", "AVDD", }; #define OV2680_NUM_SUPPLIES ARRAY_SIZE(ov2680_supply_name) struct ov2680_mode_info { const char *name; enum ov2680_mode_id id; u32 width; u32 height; const struct reg_value *reg_data; u32 reg_data_size; }; struct ov2680_ctrls { struct v4l2_ctrl_handler handler; struct v4l2_ctrl *exposure; struct v4l2_ctrl *gain; struct v4l2_ctrl *hflip; struct v4l2_ctrl *vflip; struct v4l2_ctrl *test_pattern; }; struct ov2680_dev { struct i2c_client *i2c_client; struct v4l2_subdev sd; struct media_pad pad; struct clk *xvclk; u32 xvclk_freq; struct regulator_bulk_data supplies[OV2680_NUM_SUPPLIES]; struct gpio_desc *reset_gpio; struct mutex lock; /* protect members */ bool mode_pending_changes; bool is_enabled; bool is_streaming; struct ov2680_ctrls ctrls; struct v4l2_mbus_framefmt fmt; struct v4l2_fract frame_interval; const struct ov2680_mode_info *current_mode; }; static const char * const test_pattern_menu[] = { "Disabled", "Color Bars", "Random Data", "Square", "Black Image", }; static const int ov2680_hv_flip_bayer_order[] = { MEDIA_BUS_FMT_SBGGR10_1X10, MEDIA_BUS_FMT_SGRBG10_1X10, MEDIA_BUS_FMT_SGBRG10_1X10, MEDIA_BUS_FMT_SRGGB10_1X10, }; static const struct reg_value ov2680_setting_30fps_QUXGA_800_600[] = { {0x3086, 0x01}, {0x370a, 0x23}, {0x3808, 0x03}, {0x3809, 0x20}, {0x380a, 0x02}, {0x380b, 0x58}, {0x380c, 0x06}, {0x380d, 0xac}, {0x380e, 0x02}, {0x380f, 0x84}, {0x3811, 0x04}, {0x3813, 0x04}, {0x3814, 0x31}, {0x3815, 0x31}, {0x3820, 0xc0}, {0x4008, 0x00}, {0x4009, 0x03}, {0x4837, 0x1e}, {0x3501, 0x4e}, {0x3502, 0xe0}, {0x3503, 0x03}, }; static const struct reg_value ov2680_setting_30fps_720P_1280_720[] = { {0x3086, 0x00}, {0x3808, 0x05}, {0x3809, 0x00}, {0x380a, 0x02}, {0x380b, 0xd0}, {0x380c, 0x06}, {0x380d, 0xa8}, {0x380e, 0x05}, {0x380f, 0x0e}, {0x3811, 0x08}, {0x3813, 0x06}, {0x3814, 0x11}, {0x3815, 0x11}, {0x3820, 0xc0}, {0x4008, 0x00}, }; static const struct reg_value ov2680_setting_30fps_UXGA_1600_1200[] = { {0x3086, 0x00}, {0x3501, 0x4e}, {0x3502, 0xe0}, {0x3808, 0x06}, {0x3809, 0x40}, {0x380a, 0x04}, {0x380b, 0xb0}, {0x380c, 0x06}, {0x380d, 0xa8}, {0x380e, 0x05}, {0x380f, 0x0e}, {0x3811, 0x00}, {0x3813, 0x00}, {0x3814, 0x11}, {0x3815, 0x11}, {0x3820, 0xc0}, {0x4008, 0x00}, {0x4837, 0x18} }; static const struct ov2680_mode_info ov2680_mode_init_data = { "mode_quxga_800_600", OV2680_MODE_QUXGA_800_600, 800, 600, ov2680_setting_30fps_QUXGA_800_600, ARRAY_SIZE(ov2680_setting_30fps_QUXGA_800_600), }; static const struct ov2680_mode_info ov2680_mode_data[OV2680_MODE_MAX] = { {"mode_quxga_800_600", OV2680_MODE_QUXGA_800_600, 800, 600, ov2680_setting_30fps_QUXGA_800_600, ARRAY_SIZE(ov2680_setting_30fps_QUXGA_800_600)}, {"mode_720p_1280_720", OV2680_MODE_720P_1280_720, 1280, 720, ov2680_setting_30fps_720P_1280_720, ARRAY_SIZE(ov2680_setting_30fps_720P_1280_720)}, {"mode_uxga_1600_1200", OV2680_MODE_UXGA_1600_1200, 1600, 1200, ov2680_setting_30fps_UXGA_1600_1200, ARRAY_SIZE(ov2680_setting_30fps_UXGA_1600_1200)}, }; static struct ov2680_dev *to_ov2680_dev(struct v4l2_subdev *sd) { return container_of(sd, struct ov2680_dev, sd); } static struct device *ov2680_to_dev(struct ov2680_dev *sensor) { return &sensor->i2c_client->dev; } static inline struct v4l2_subdev *ctrl_to_sd(struct v4l2_ctrl *ctrl) { return &container_of(ctrl->handler, struct ov2680_dev, ctrls.handler)->sd; } static int __ov2680_write_reg(struct ov2680_dev *sensor, u16 reg, unsigned int len, u32 val) { struct i2c_client *client = sensor->i2c_client; u8 buf[6]; int ret; if (len > 4) return -EINVAL; put_unaligned_be16(reg, buf); put_unaligned_be32(val << (8 * (4 - len)), buf + 2); ret = i2c_master_send(client, buf, len + 2); if (ret != len + 2) { dev_err(&client->dev, "write error: reg=0x%4x: %d\n", reg, ret); return -EIO; } return 0; } #define ov2680_write_reg(s, r, v) \ __ov2680_write_reg(s, r, OV2680_REG_VALUE_8BIT, v) #define ov2680_write_reg16(s, r, v) \ __ov2680_write_reg(s, r, OV2680_REG_VALUE_16BIT, v) #define ov2680_write_reg24(s, r, v) \ __ov2680_write_reg(s, r, OV2680_REG_VALUE_24BIT, v) static int __ov2680_read_reg(struct ov2680_dev *sensor, u16 reg, unsigned int len, u32 *val) { struct i2c_client *client = sensor->i2c_client; struct i2c_msg msgs[2]; u8 addr_buf[2] = { reg >> 8, reg & 0xff }; u8 data_buf[4] = { 0, }; int ret; if (len > 4) return -EINVAL; msgs[0].addr = client->addr; msgs[0].flags = 0; msgs[0].len = ARRAY_SIZE(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)) { dev_err(&client->dev, "read error: reg=0x%4x: %d\n", reg, ret); return -EIO; } *val = get_unaligned_be32(data_buf); return 0; } #define ov2680_read_reg(s, r, v) \ __ov2680_read_reg(s, r, OV2680_REG_VALUE_8BIT, v) #define ov2680_read_reg16(s, r, v) \ __ov2680_read_reg(s, r, OV2680_REG_VALUE_16BIT, v) #define ov2680_read_reg24(s, r, v) \ __ov2680_read_reg(s, r, OV2680_REG_VALUE_24BIT, v) static int ov2680_mod_reg(struct ov2680_dev *sensor, u16 reg, u8 mask, u8 val) { u32 readval; int ret; ret = ov2680_read_reg(sensor, reg, &readval); if (ret < 0) return ret; readval &= ~mask; val &= mask; val |= readval; return ov2680_write_reg(sensor, reg, val); } static int ov2680_load_regs(struct ov2680_dev *sensor, const struct ov2680_mode_info *mode) { const struct reg_value *regs = mode->reg_data; unsigned int i; int ret = 0; u16 reg_addr; u8 val; for (i = 0; i < mode->reg_data_size; ++i, ++regs) { reg_addr = regs->reg_addr; val = regs->val; ret = ov2680_write_reg(sensor, reg_addr, val); if (ret) break; } return ret; } static void ov2680_power_up(struct ov2680_dev *sensor) { if (!sensor->reset_gpio) return; gpiod_set_value(sensor->reset_gpio, 0); usleep_range(5000, 10000); } static void ov2680_power_down(struct ov2680_dev *sensor) { if (!sensor->reset_gpio) return; gpiod_set_value(sensor->reset_gpio, 1); usleep_range(5000, 10000); } static void ov2680_set_bayer_order(struct ov2680_dev *sensor) { int hv_flip = 0; if (sensor->ctrls.vflip && sensor->ctrls.vflip->val) hv_flip += 1; if (sensor->ctrls.hflip && sensor->ctrls.hflip->val) hv_flip += 2; sensor->fmt.code = ov2680_hv_flip_bayer_order[hv_flip]; } static int ov2680_set_vflip(struct ov2680_dev *sensor, s32 val) { int ret; if (sensor->is_streaming) return -EBUSY; ret = ov2680_mod_reg(sensor, OV2680_REG_FORMAT1, BIT(2), val ? BIT(2) : 0); if (ret < 0) return ret; ov2680_set_bayer_order(sensor); return 0; } static int ov2680_set_hflip(struct ov2680_dev *sensor, s32 val) { int ret; if (sensor->is_streaming) return -EBUSY; ret = ov2680_mod_reg(sensor, OV2680_REG_FORMAT2, BIT(2), val ? BIT(2) : 0); if (ret < 0) return ret; ov2680_set_bayer_order(sensor); return 0; } static int ov2680_test_pattern_set(struct ov2680_dev *sensor, int value) { int ret; if (!value) return ov2680_mod_reg(sensor, OV2680_REG_ISP_CTRL00, BIT(7), 0); ret = ov2680_mod_reg(sensor, OV2680_REG_ISP_CTRL00, 0x03, value - 1); if (ret < 0) return ret; ret = ov2680_mod_reg(sensor, OV2680_REG_ISP_CTRL00, BIT(7), BIT(7)); if (ret < 0) return ret; return 0; } static int ov2680_gain_set(struct ov2680_dev *sensor, u32 gain) { return ov2680_write_reg16(sensor, OV2680_REG_GAIN_PK, gain); } static int ov2680_exposure_set(struct ov2680_dev *sensor, u32 exp) { return ov2680_write_reg24(sensor, OV2680_REG_EXPOSURE_PK_HIGH, exp << 4); } static int ov2680_stream_enable(struct ov2680_dev *sensor) { return ov2680_write_reg(sensor, OV2680_REG_STREAM_CTRL, 1); } static int ov2680_stream_disable(struct ov2680_dev *sensor) { return ov2680_write_reg(sensor, OV2680_REG_STREAM_CTRL, 0); } static int ov2680_mode_set(struct ov2680_dev *sensor) { int ret; ret = ov2680_load_regs(sensor, sensor->current_mode); if (ret < 0) return ret; /* Restore value of all ctrls */ ret = __v4l2_ctrl_handler_setup(&sensor->ctrls.handler); if (ret < 0) return ret; sensor->mode_pending_changes = false; return 0; } static int ov2680_mode_restore(struct ov2680_dev *sensor) { int ret; ret = ov2680_load_regs(sensor, &ov2680_mode_init_data); if (ret < 0) return ret; return ov2680_mode_set(sensor); } static int ov2680_power_off(struct ov2680_dev *sensor) { if (!sensor->is_enabled) return 0; clk_disable_unprepare(sensor->xvclk); ov2680_power_down(sensor); regulator_bulk_disable(OV2680_NUM_SUPPLIES, sensor->supplies); sensor->is_enabled = false; return 0; } static int ov2680_power_on(struct ov2680_dev *sensor) { struct device *dev = ov2680_to_dev(sensor); int ret; if (sensor->is_enabled) return 0; ret = regulator_bulk_enable(OV2680_NUM_SUPPLIES, sensor->supplies); if (ret < 0) { dev_err(dev, "failed to enable regulators: %d\n", ret); return ret; } if (!sensor->reset_gpio) { ret = ov2680_write_reg(sensor, OV2680_REG_SOFT_RESET, 0x01); if (ret != 0) { dev_err(dev, "sensor soft reset failed\n"); goto err_disable_regulators; } usleep_range(1000, 2000); } else { ov2680_power_down(sensor); ov2680_power_up(sensor); } ret = clk_prepare_enable(sensor->xvclk); if (ret < 0) goto err_disable_regulators; sensor->is_enabled = true; /* Set clock lane into LP-11 state */ ov2680_stream_enable(sensor); usleep_range(1000, 2000); ov2680_stream_disable(sensor); return 0; err_disable_regulators: regulator_bulk_disable(OV2680_NUM_SUPPLIES, sensor->supplies); return ret; } static int ov2680_s_power(struct v4l2_subdev *sd, int on) { struct ov2680_dev *sensor = to_ov2680_dev(sd); int ret = 0; mutex_lock(&sensor->lock); if (on) ret = ov2680_power_on(sensor); else ret = ov2680_power_off(sensor); if (on && ret == 0) ret = ov2680_mode_restore(sensor); mutex_unlock(&sensor->lock); return ret; } static int ov2680_s_g_frame_interval(struct v4l2_subdev *sd, struct v4l2_subdev_frame_interval *fi) { struct ov2680_dev *sensor = to_ov2680_dev(sd); mutex_lock(&sensor->lock); fi->interval = sensor->frame_interval; mutex_unlock(&sensor->lock); return 0; } static int ov2680_s_stream(struct v4l2_subdev *sd, int enable) { struct ov2680_dev *sensor = to_ov2680_dev(sd); int ret = 0; mutex_lock(&sensor->lock); if (sensor->is_streaming == !!enable) goto unlock; if (enable && sensor->mode_pending_changes) { ret = ov2680_mode_set(sensor); if (ret < 0) goto unlock; } if (enable) ret = ov2680_stream_enable(sensor); else ret = ov2680_stream_disable(sensor); sensor->is_streaming = !!enable; unlock: mutex_unlock(&sensor->lock); return ret; } static int ov2680_enum_mbus_code(struct v4l2_subdev *sd, struct v4l2_subdev_pad_config *cfg, struct v4l2_subdev_mbus_code_enum *code) { struct ov2680_dev *sensor = to_ov2680_dev(sd); if (code->pad != 0 || code->index != 0) return -EINVAL; code->code = sensor->fmt.code; return 0; } static int ov2680_get_fmt(struct v4l2_subdev *sd, struct v4l2_subdev_pad_config *cfg, struct v4l2_subdev_format *format) { struct ov2680_dev *sensor = to_ov2680_dev(sd); struct v4l2_mbus_framefmt *fmt = NULL; int ret = 0; if (format->pad != 0) return -EINVAL; mutex_lock(&sensor->lock); if (format->which == V4L2_SUBDEV_FORMAT_TRY) { #ifdef CONFIG_VIDEO_V4L2_SUBDEV_API fmt = v4l2_subdev_get_try_format(&sensor->sd, cfg, format->pad); #else ret = -EINVAL; #endif } else { fmt = &sensor->fmt; } if (fmt) format->format = *fmt; mutex_unlock(&sensor->lock); return ret; } static int ov2680_set_fmt(struct v4l2_subdev *sd, struct v4l2_subdev_pad_config *cfg, struct v4l2_subdev_format *format) { struct ov2680_dev *sensor = to_ov2680_dev(sd); struct v4l2_mbus_framefmt *fmt = &format->format; #ifdef CONFIG_VIDEO_V4L2_SUBDEV_API struct v4l2_mbus_framefmt *try_fmt; #endif const struct ov2680_mode_info *mode; int ret = 0; if (format->pad != 0) return -EINVAL; mutex_lock(&sensor->lock); if (sensor->is_streaming) { ret = -EBUSY; goto unlock; } mode = v4l2_find_nearest_size(ov2680_mode_data, ARRAY_SIZE(ov2680_mode_data), width, height, fmt->width, fmt->height); if (!mode) { ret = -EINVAL; goto unlock; } if (format->which == V4L2_SUBDEV_FORMAT_TRY) { #ifdef CONFIG_VIDEO_V4L2_SUBDEV_API try_fmt = v4l2_subdev_get_try_format(sd, cfg, 0); format->format = *try_fmt; #endif goto unlock; } fmt->width = mode->width; fmt->height = mode->height; fmt->code = sensor->fmt.code; fmt->colorspace = sensor->fmt.colorspace; sensor->current_mode = mode; sensor->fmt = format->format; sensor->mode_pending_changes = true; unlock: mutex_unlock(&sensor->lock); return ret; } static int ov2680_init_cfg(struct v4l2_subdev *sd, struct v4l2_subdev_pad_config *cfg) { struct v4l2_subdev_format fmt = { .which = cfg ? V4L2_SUBDEV_FORMAT_TRY : V4L2_SUBDEV_FORMAT_ACTIVE, .format = { .width = 800, .height = 600, } }; return ov2680_set_fmt(sd, cfg, &fmt); } static int ov2680_enum_frame_size(struct v4l2_subdev *sd, struct v4l2_subdev_pad_config *cfg, struct v4l2_subdev_frame_size_enum *fse) { int index = fse->index; if (index >= OV2680_MODE_MAX || index < 0) return -EINVAL; fse->min_width = ov2680_mode_data[index].width; fse->min_height = ov2680_mode_data[index].height; fse->max_width = ov2680_mode_data[index].width; fse->max_height = ov2680_mode_data[index].height; return 0; } static int ov2680_enum_frame_interval(struct v4l2_subdev *sd, struct v4l2_subdev_pad_config *cfg, struct v4l2_subdev_frame_interval_enum *fie) { struct v4l2_fract tpf; if (fie->index >= OV2680_MODE_MAX || fie->width > OV2680_WIDTH_MAX || fie->height > OV2680_HEIGHT_MAX || fie->which > V4L2_SUBDEV_FORMAT_ACTIVE) return -EINVAL; tpf.denominator = OV2680_FRAME_RATE; tpf.numerator = 1; fie->interval = tpf; return 0; } static int ov2680_s_ctrl(struct v4l2_ctrl *ctrl) { struct v4l2_subdev *sd = ctrl_to_sd(ctrl); struct ov2680_dev *sensor = to_ov2680_dev(sd); if (!sensor->is_enabled) return 0; switch (ctrl->id) { case V4L2_CID_GAIN: return ov2680_gain_set(sensor, ctrl->val); case V4L2_CID_EXPOSURE: return ov2680_exposure_set(sensor, ctrl->val); case V4L2_CID_VFLIP: return ov2680_set_vflip(sensor, ctrl->val); case V4L2_CID_HFLIP: return ov2680_set_hflip(sensor, ctrl->val); case V4L2_CID_TEST_PATTERN: return ov2680_test_pattern_set(sensor, ctrl->val); default: break; } return -EINVAL; } static const struct v4l2_ctrl_ops ov2680_ctrl_ops = { .s_ctrl = ov2680_s_ctrl, }; static const struct v4l2_subdev_core_ops ov2680_core_ops = { .s_power = ov2680_s_power, }; static const struct v4l2_subdev_video_ops ov2680_video_ops = { .g_frame_interval = ov2680_s_g_frame_interval, .s_frame_interval = ov2680_s_g_frame_interval, .s_stream = ov2680_s_stream, }; static const struct v4l2_subdev_pad_ops ov2680_pad_ops = { .init_cfg = ov2680_init_cfg, .enum_mbus_code = ov2680_enum_mbus_code, .get_fmt = ov2680_get_fmt, .set_fmt = ov2680_set_fmt, .enum_frame_size = ov2680_enum_frame_size, .enum_frame_interval = ov2680_enum_frame_interval, }; static const struct v4l2_subdev_ops ov2680_subdev_ops = { .core = &ov2680_core_ops, .video = &ov2680_video_ops, .pad = &ov2680_pad_ops, }; static int ov2680_mode_init(struct ov2680_dev *sensor) { const struct ov2680_mode_info *init_mode; /* set initial mode */ sensor->fmt.code = MEDIA_BUS_FMT_SBGGR10_1X10; sensor->fmt.width = 800; sensor->fmt.height = 600; sensor->fmt.field = V4L2_FIELD_NONE; sensor->fmt.colorspace = V4L2_COLORSPACE_SRGB; sensor->frame_interval.denominator = OV2680_FRAME_RATE; sensor->frame_interval.numerator = 1; init_mode = &ov2680_mode_init_data; sensor->current_mode = init_mode; sensor->mode_pending_changes = true; return 0; } static int ov2680_v4l2_register(struct ov2680_dev *sensor) { const struct v4l2_ctrl_ops *ops = &ov2680_ctrl_ops; struct ov2680_ctrls *ctrls = &sensor->ctrls; struct v4l2_ctrl_handler *hdl = &ctrls->handler; int ret = 0; v4l2_i2c_subdev_init(&sensor->sd, sensor->i2c_client, &ov2680_subdev_ops); #ifdef CONFIG_VIDEO_V4L2_SUBDEV_API sensor->sd.flags = V4L2_SUBDEV_FL_HAS_DEVNODE; #endif sensor->pad.flags = MEDIA_PAD_FL_SOURCE; sensor->sd.entity.function = MEDIA_ENT_F_CAM_SENSOR; ret = media_entity_pads_init(&sensor->sd.entity, 1, &sensor->pad); if (ret < 0) return ret; v4l2_ctrl_handler_init(hdl, 5); hdl->lock = &sensor->lock; ctrls->vflip = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_VFLIP, 0, 1, 1, 0); ctrls->hflip = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_HFLIP, 0, 1, 1, 0); ctrls->test_pattern = v4l2_ctrl_new_std_menu_items(hdl, &ov2680_ctrl_ops, V4L2_CID_TEST_PATTERN, ARRAY_SIZE(test_pattern_menu) - 1, 0, 0, test_pattern_menu); ctrls->exposure = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_EXPOSURE, 0, 32767, 1, 0); ctrls->gain = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_GAIN, 0, 2047, 1, 0); if (hdl->error) { ret = hdl->error; goto cleanup_entity; } ctrls->vflip->flags |= V4L2_CTRL_FLAG_MODIFY_LAYOUT; ctrls->hflip->flags |= V4L2_CTRL_FLAG_MODIFY_LAYOUT; sensor->sd.ctrl_handler = hdl; ret = v4l2_async_register_subdev(&sensor->sd); if (ret < 0) goto cleanup_entity; return 0; cleanup_entity: media_entity_cleanup(&sensor->sd.entity); v4l2_ctrl_handler_free(hdl); return ret; } static int ov2680_get_regulators(struct ov2680_dev *sensor) { int i; for (i = 0; i < OV2680_NUM_SUPPLIES; i++) sensor->supplies[i].supply = ov2680_supply_name[i]; return devm_regulator_bulk_get(&sensor->i2c_client->dev, OV2680_NUM_SUPPLIES, sensor->supplies); } static int ov2680_check_id(struct ov2680_dev *sensor) { struct device *dev = ov2680_to_dev(sensor); u32 chip_id; int ret; ov2680_power_on(sensor); ret = ov2680_read_reg16(sensor, OV2680_REG_CHIP_ID_HIGH, &chip_id); if (ret < 0) { dev_err(dev, "failed to read chip id high\n"); return -ENODEV; } if (chip_id != OV2680_CHIP_ID) { dev_err(dev, "chip id: 0x%04x does not match expected 0x%04x\n", chip_id, OV2680_CHIP_ID); return -ENODEV; } return 0; } static int ov2680_parse_dt(struct ov2680_dev *sensor) { struct device *dev = ov2680_to_dev(sensor); int ret; sensor->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH); ret = PTR_ERR_OR_ZERO(sensor->reset_gpio); if (ret < 0) { dev_dbg(dev, "error while getting reset gpio: %d\n", ret); return ret; } sensor->xvclk = devm_clk_get(dev, "xvclk"); if (IS_ERR(sensor->xvclk)) { dev_err(dev, "xvclk clock missing or invalid\n"); return PTR_ERR(sensor->xvclk); } sensor->xvclk_freq = clk_get_rate(sensor->xvclk); if (sensor->xvclk_freq != OV2680_XVCLK_VALUE) { dev_err(dev, "wrong xvclk frequency %d HZ, expected: %d Hz\n", sensor->xvclk_freq, OV2680_XVCLK_VALUE); return -EINVAL; } return 0; } static int ov2680_probe(struct i2c_client *client) { struct device *dev = &client->dev; struct ov2680_dev *sensor; int ret; sensor = devm_kzalloc(dev, sizeof(*sensor), GFP_KERNEL); if (!sensor) return -ENOMEM; sensor->i2c_client = client; ret = ov2680_parse_dt(sensor); if (ret < 0) return -EINVAL; ret = ov2680_mode_init(sensor); if (ret < 0) return ret; ret = ov2680_get_regulators(sensor); if (ret < 0) { dev_err(dev, "failed to get regulators\n"); return ret; } mutex_init(&sensor->lock); ret = ov2680_check_id(sensor); if (ret < 0) goto lock_destroy; ret = ov2680_v4l2_register(sensor); if (ret < 0) goto lock_destroy; dev_info(dev, "ov2680 init correctly\n"); return 0; lock_destroy: dev_err(dev, "ov2680 init fail: %d\n", ret); mutex_destroy(&sensor->lock); return ret; } static int ov2680_remove(struct i2c_client *client) { struct v4l2_subdev *sd = i2c_get_clientdata(client); struct ov2680_dev *sensor = to_ov2680_dev(sd); v4l2_async_unregister_subdev(&sensor->sd); mutex_destroy(&sensor->lock); media_entity_cleanup(&sensor->sd.entity); v4l2_ctrl_handler_free(&sensor->ctrls.handler); return 0; } static int __maybe_unused ov2680_suspend(struct device *dev) { struct i2c_client *client = to_i2c_client(dev); struct v4l2_subdev *sd = i2c_get_clientdata(client); struct ov2680_dev *sensor = to_ov2680_dev(sd); if (sensor->is_streaming) ov2680_stream_disable(sensor); return 0; } static int __maybe_unused ov2680_resume(struct device *dev) { struct i2c_client *client = to_i2c_client(dev); struct v4l2_subdev *sd = i2c_get_clientdata(client); struct ov2680_dev *sensor = to_ov2680_dev(sd); int ret; if (sensor->is_streaming) { ret = ov2680_stream_enable(sensor); if (ret < 0) goto stream_disable; } return 0; stream_disable: ov2680_stream_disable(sensor); sensor->is_streaming = false; return ret; } static const struct dev_pm_ops ov2680_pm_ops = { SET_SYSTEM_SLEEP_PM_OPS(ov2680_suspend, ov2680_resume) }; static const struct of_device_id ov2680_dt_ids[] = { { .compatible = "ovti,ov2680" }, { /* sentinel */ }, }; MODULE_DEVICE_TABLE(of, ov2680_dt_ids); static struct i2c_driver ov2680_i2c_driver = { .driver = { .name = "ov2680", .pm = &ov2680_pm_ops, .of_match_table = of_match_ptr(ov2680_dt_ids), }, .probe_new = ov2680_probe, .remove = ov2680_remove, }; module_i2c_driver(ov2680_i2c_driver); MODULE_AUTHOR("Rui Miguel Silva "); MODULE_DESCRIPTION("OV2680 CMOS Image Sensor driver"); MODULE_LICENSE("GPL v2");