diff options
Diffstat (limited to 'drivers/media/i2c/ov2680.c')
| -rw-r--r-- | drivers/media/i2c/ov2680.c | 1006 |
1 files changed, 1006 insertions, 0 deletions
diff --git a/drivers/media/i2c/ov2680.c b/drivers/media/i2c/ov2680.c new file mode 100644 index 000000000..8943e4e78 --- /dev/null +++ b/drivers/media/i2c/ov2680.c @@ -0,0 +1,1006 @@ +// 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 <asm/unaligned.h> +#include <linux/clk.h> +#include <linux/delay.h> +#include <linux/err.h> +#include <linux/i2c.h> +#include <linux/init.h> +#include <linux/module.h> +#include <linux/of_device.h> +#include <linux/gpio/consumer.h> +#include <linux/regulator/consumer.h> + +#include <media/v4l2-common.h> +#include <media/v4l2-ctrls.h> +#include <media/v4l2-subdev.h> + +#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 + +#define OV2680_DEFAULT_WIDTH 800 +#define OV2680_DEFAULT_HEIGHT 600 + +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, + struct v4l2_mbus_framefmt *fmt) +{ + 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; + + fmt->code = ov2680_hv_flip_bayer_order[hv_flip]; +} + +static void ov2680_fill_format(struct ov2680_dev *sensor, + struct v4l2_mbus_framefmt *fmt, + unsigned int width, unsigned int height) +{ + memset(fmt, 0, sizeof(*fmt)); + fmt->width = width; + fmt->height = height; + fmt->field = V4L2_FIELD_NONE; + fmt->colorspace = V4L2_COLORSPACE_SRGB; + ov2680_set_bayer_order(sensor, fmt); +} + +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, &sensor->fmt); + 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, &sensor->fmt); + 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_state *sd_state, + 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_state *sd_state, + struct v4l2_subdev_format *format) +{ + struct ov2680_dev *sensor = to_ov2680_dev(sd); + struct v4l2_mbus_framefmt *fmt = NULL; + + if (format->pad != 0) + return -EINVAL; + + mutex_lock(&sensor->lock); + + if (format->which == V4L2_SUBDEV_FORMAT_TRY) { + fmt = v4l2_subdev_get_try_format(&sensor->sd, sd_state, + format->pad); + } else { + fmt = &sensor->fmt; + } + + format->format = *fmt; + + mutex_unlock(&sensor->lock); + + return 0; +} + +static int ov2680_set_fmt(struct v4l2_subdev *sd, + struct v4l2_subdev_state *sd_state, + struct v4l2_subdev_format *format) +{ + struct ov2680_dev *sensor = to_ov2680_dev(sd); + struct v4l2_mbus_framefmt *try_fmt; + const struct ov2680_mode_info *mode; + int ret = 0; + + if (format->pad != 0) + return -EINVAL; + + mode = v4l2_find_nearest_size(ov2680_mode_data, + ARRAY_SIZE(ov2680_mode_data), + width, height, + format->format.width, + format->format.height); + if (!mode) + return -EINVAL; + + ov2680_fill_format(sensor, &format->format, mode->width, mode->height); + + if (format->which == V4L2_SUBDEV_FORMAT_TRY) { + try_fmt = v4l2_subdev_get_try_format(sd, sd_state, 0); + *try_fmt = format->format; + return 0; + } + + mutex_lock(&sensor->lock); + + if (sensor->is_streaming) { + ret = -EBUSY; + goto unlock; + } + + 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_state *sd_state) +{ + struct ov2680_dev *sensor = to_ov2680_dev(sd); + + ov2680_fill_format(sensor, &sd_state->pads[0].try_fmt, + OV2680_DEFAULT_WIDTH, OV2680_DEFAULT_HEIGHT); + return 0; +} + +static int ov2680_enum_frame_size(struct v4l2_subdev *sd, + struct v4l2_subdev_state *sd_state, + 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_state *sd_state, + 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 */ + ov2680_fill_format(sensor, &sensor->fmt, + OV2680_DEFAULT_WIDTH, OV2680_DEFAULT_HEIGHT); + + 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); + + sensor->sd.flags = V4L2_SUBDEV_FL_HAS_DEVNODE; + 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 void 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); +} + +static int __maybe_unused ov2680_suspend(struct device *dev) +{ + struct v4l2_subdev *sd = dev_get_drvdata(dev); + 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 v4l2_subdev *sd = dev_get_drvdata(dev); + 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 <rui.silva@linaro.org>"); +MODULE_DESCRIPTION("OV2680 CMOS Image Sensor driver"); +MODULE_LICENSE("GPL v2"); |