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Diffstat (limited to 'drivers/media/i2c/ov2680.c')
-rw-r--r--drivers/media/i2c/ov2680.c1286
1 files changed, 1286 insertions, 0 deletions
diff --git a/drivers/media/i2c/ov2680.c b/drivers/media/i2c/ov2680.c
new file mode 100644
index 0000000000..72bab0ff8a
--- /dev/null
+++ b/drivers/media/i2c/ov2680.c
@@ -0,0 +1,1286 @@
+// 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 <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/gpio/consumer.h>
+#include <linux/i2c.h>
+#include <linux/init.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/pm_runtime.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+
+#include <media/v4l2-cci.h>
+#include <media/v4l2-common.h>
+#include <media/v4l2-ctrls.h>
+#include <media/v4l2-fwnode.h>
+#include <media/v4l2-subdev.h>
+
+#define OV2680_CHIP_ID 0x2680
+
+#define OV2680_REG_STREAM_CTRL CCI_REG8(0x0100)
+#define OV2680_REG_SOFT_RESET CCI_REG8(0x0103)
+
+#define OV2680_REG_CHIP_ID CCI_REG16(0x300a)
+#define OV2680_REG_SC_CMMN_SUB_ID CCI_REG8(0x302a)
+#define OV2680_REG_PLL_MULTIPLIER CCI_REG16(0x3081)
+
+#define OV2680_REG_EXPOSURE_PK CCI_REG24(0x3500)
+#define OV2680_REG_R_MANUAL CCI_REG8(0x3503)
+#define OV2680_REG_GAIN_PK CCI_REG16(0x350a)
+
+#define OV2680_REG_SENSOR_CTRL_0A CCI_REG8(0x370a)
+
+#define OV2680_REG_HORIZONTAL_START CCI_REG16(0x3800)
+#define OV2680_REG_VERTICAL_START CCI_REG16(0x3802)
+#define OV2680_REG_HORIZONTAL_END CCI_REG16(0x3804)
+#define OV2680_REG_VERTICAL_END CCI_REG16(0x3806)
+#define OV2680_REG_HORIZONTAL_OUTPUT_SIZE CCI_REG16(0x3808)
+#define OV2680_REG_VERTICAL_OUTPUT_SIZE CCI_REG16(0x380a)
+#define OV2680_REG_TIMING_HTS CCI_REG16(0x380c)
+#define OV2680_REG_TIMING_VTS CCI_REG16(0x380e)
+#define OV2680_REG_ISP_X_WIN CCI_REG16(0x3810)
+#define OV2680_REG_ISP_Y_WIN CCI_REG16(0x3812)
+#define OV2680_REG_X_INC CCI_REG8(0x3814)
+#define OV2680_REG_Y_INC CCI_REG8(0x3815)
+#define OV2680_REG_FORMAT1 CCI_REG8(0x3820)
+#define OV2680_REG_FORMAT2 CCI_REG8(0x3821)
+
+#define OV2680_REG_ISP_CTRL00 CCI_REG8(0x5080)
+
+#define OV2680_REG_X_WIN CCI_REG16(0x5704)
+#define OV2680_REG_Y_WIN CCI_REG16(0x5706)
+
+#define OV2680_FRAME_RATE 30
+
+#define OV2680_NATIVE_WIDTH 1616
+#define OV2680_NATIVE_HEIGHT 1216
+#define OV2680_NATIVE_START_LEFT 0
+#define OV2680_NATIVE_START_TOP 0
+#define OV2680_ACTIVE_WIDTH 1600
+#define OV2680_ACTIVE_HEIGHT 1200
+#define OV2680_ACTIVE_START_LEFT 8
+#define OV2680_ACTIVE_START_TOP 8
+#define OV2680_MIN_CROP_WIDTH 2
+#define OV2680_MIN_CROP_HEIGHT 2
+
+/* Fixed pre-div of 1/2 */
+#define OV2680_PLL_PREDIV0 2
+
+/* Pre-div configurable through reg 0x3080, left at its default of 0x02 : 1/2 */
+#define OV2680_PLL_PREDIV 2
+
+/* 66MHz pixel clock: 66MHz / 1704 * 1294 = 30fps */
+#define OV2680_PIXELS_PER_LINE 1704
+#define OV2680_LINES_PER_FRAME 1294
+
+/* If possible send 16 extra rows / lines to the ISP as padding */
+#define OV2680_END_MARGIN 16
+
+/* Max exposure time is VTS - 8 */
+#define OV2680_INTEGRATION_TIME_MARGIN 8
+
+#define OV2680_DEFAULT_WIDTH 800
+#define OV2680_DEFAULT_HEIGHT 600
+
+/* For enum_frame_size() full-size + binned-/quarter-size */
+#define OV2680_FRAME_SIZES 2
+
+static const char * const ov2680_supply_name[] = {
+ "DOVDD",
+ "DVDD",
+ "AVDD",
+};
+
+#define OV2680_NUM_SUPPLIES ARRAY_SIZE(ov2680_supply_name)
+
+enum {
+ OV2680_19_2_MHZ,
+ OV2680_24_MHZ,
+};
+
+static const unsigned long ov2680_xvclk_freqs[] = {
+ [OV2680_19_2_MHZ] = 19200000,
+ [OV2680_24_MHZ] = 24000000,
+};
+
+static const u8 ov2680_pll_multipliers[] = {
+ [OV2680_19_2_MHZ] = 69,
+ [OV2680_24_MHZ] = 55,
+};
+
+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 v4l2_ctrl *link_freq;
+ struct v4l2_ctrl *pixel_rate;
+};
+
+struct ov2680_mode {
+ struct v4l2_rect crop;
+ struct v4l2_mbus_framefmt fmt;
+ struct v4l2_fract frame_interval;
+ bool binning;
+ u16 h_start;
+ u16 v_start;
+ u16 h_end;
+ u16 v_end;
+ u16 h_output_size;
+ u16 v_output_size;
+ u16 hts;
+ u16 vts;
+};
+
+struct ov2680_dev {
+ struct device *dev;
+ struct regmap *regmap;
+ struct v4l2_subdev sd;
+
+ struct media_pad pad;
+ struct clk *xvclk;
+ u32 xvclk_freq;
+ u8 pll_mult;
+ s64 link_freq[1];
+ u64 pixel_rate;
+ struct regulator_bulk_data supplies[OV2680_NUM_SUPPLIES];
+
+ struct gpio_desc *pwdn_gpio;
+ struct mutex lock; /* protect members */
+
+ bool is_streaming;
+
+ struct ov2680_ctrls ctrls;
+ struct ov2680_mode mode;
+};
+
+static const struct v4l2_rect ov2680_default_crop = {
+ .left = OV2680_ACTIVE_START_LEFT,
+ .top = OV2680_ACTIVE_START_TOP,
+ .width = OV2680_ACTIVE_WIDTH,
+ .height = OV2680_ACTIVE_HEIGHT,
+};
+
+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_sequence ov2680_global_setting[] = {
+ /* MIPI PHY, 0x10 -> 0x1c enable bp_c_hs_en_lat and bp_d_hs_en_lat */
+ {0x3016, 0x1c},
+
+ /* R MANUAL set exposure and gain to manual (hw does not do auto) */
+ {0x3503, 0x03},
+
+ /* Analog control register tweaks */
+ {0x3603, 0x39}, /* Reset value 0x99 */
+ {0x3604, 0x24}, /* Reset value 0x74 */
+ {0x3621, 0x37}, /* Reset value 0x44 */
+
+ /* Sensor control register tweaks */
+ {0x3701, 0x64}, /* Reset value 0x61 */
+ {0x3705, 0x3c}, /* Reset value 0x21 */
+ {0x370c, 0x50}, /* Reset value 0x10 */
+ {0x370d, 0xc0}, /* Reset value 0x00 */
+ {0x3718, 0x88}, /* Reset value 0x80 */
+
+ /* PSRAM tweaks */
+ {0x3781, 0x80}, /* Reset value 0x00 */
+ {0x3784, 0x0c}, /* Reset value 0x00, based on OV2680_R1A_AM10.ovt */
+ {0x3789, 0x60}, /* Reset value 0x50 */
+
+ /* BLC CTRL00 0x01 -> 0x81 set avg_weight to 8 */
+ {0x4000, 0x81},
+
+ /* Set black level compensation range to 0 - 3 (default 0 - 11) */
+ {0x4008, 0x00},
+ {0x4009, 0x03},
+
+ /* VFIFO R2 0x00 -> 0x02 set Frame reset enable */
+ {0x4602, 0x02},
+
+ /* MIPI ctrl CLK PREPARE MIN change from 0x26 (38) -> 0x36 (54) */
+ {0x481f, 0x36},
+
+ /* MIPI ctrl CLK LPX P MIN change from 0x32 (50) -> 0x36 (54) */
+ {0x4825, 0x36},
+
+ /* R ISP CTRL2 0x20 -> 0x30, set sof_sel bit */
+ {0x5002, 0x30},
+
+ /*
+ * Window CONTROL 0x00 -> 0x01, enable manual window control,
+ * this is necessary for full size flip and mirror support.
+ */
+ {0x5708, 0x01},
+
+ /*
+ * DPC CTRL0 0x14 -> 0x3e, set enable_tail, enable_3x3_cluster
+ * and enable_general_tail bits based OV2680_R1A_AM10.ovt.
+ */
+ {0x5780, 0x3e},
+
+ /* DPC MORE CONNECTION CASE THRE 0x0c (12) -> 0x02 (2) */
+ {0x5788, 0x02},
+
+ /* DPC GAIN LIST1 0x0f (15) -> 0x08 (8) */
+ {0x578e, 0x08},
+
+ /* DPC GAIN LIST2 0x3f (63) -> 0x0c (12) */
+ {0x578f, 0x0c},
+
+ /* DPC THRE RATIO 0x04 (4) -> 0x00 (0) */
+ {0x5792, 0x00},
+};
+
+static struct ov2680_dev *to_ov2680_dev(struct v4l2_subdev *sd)
+{
+ return container_of(sd, struct ov2680_dev, sd);
+}
+
+static inline struct v4l2_subdev *ctrl_to_sd(struct v4l2_ctrl *ctrl)
+{
+ return &container_of(ctrl->handler, struct ov2680_dev,
+ ctrls.handler)->sd;
+}
+
+static void ov2680_power_up(struct ov2680_dev *sensor)
+{
+ if (!sensor->pwdn_gpio)
+ return;
+
+ gpiod_set_value(sensor->pwdn_gpio, 0);
+ usleep_range(5000, 10000);
+}
+
+static void ov2680_power_down(struct ov2680_dev *sensor)
+{
+ if (!sensor->pwdn_gpio)
+ return;
+
+ gpiod_set_value(sensor->pwdn_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 struct v4l2_mbus_framefmt *
+__ov2680_get_pad_format(struct ov2680_dev *sensor,
+ struct v4l2_subdev_state *state,
+ unsigned int pad,
+ enum v4l2_subdev_format_whence which)
+{
+ if (which == V4L2_SUBDEV_FORMAT_TRY)
+ return v4l2_subdev_get_try_format(&sensor->sd, state, pad);
+
+ return &sensor->mode.fmt;
+}
+
+static struct v4l2_rect *
+__ov2680_get_pad_crop(struct ov2680_dev *sensor,
+ struct v4l2_subdev_state *state,
+ unsigned int pad,
+ enum v4l2_subdev_format_whence which)
+{
+ if (which == V4L2_SUBDEV_FORMAT_TRY)
+ return v4l2_subdev_get_try_crop(&sensor->sd, state, pad);
+
+ return &sensor->mode.crop;
+}
+
+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 void ov2680_calc_mode(struct ov2680_dev *sensor)
+{
+ int width = sensor->mode.fmt.width;
+ int height = sensor->mode.fmt.height;
+ int orig_width = width;
+ int orig_height = height;
+
+ if (width <= (sensor->mode.crop.width / 2) &&
+ height <= (sensor->mode.crop.height / 2)) {
+ sensor->mode.binning = true;
+ width *= 2;
+ height *= 2;
+ } else {
+ sensor->mode.binning = false;
+ }
+
+ sensor->mode.h_start = (sensor->mode.crop.left +
+ (sensor->mode.crop.width - width) / 2) & ~1;
+ sensor->mode.v_start = (sensor->mode.crop.top +
+ (sensor->mode.crop.height - height) / 2) & ~1;
+ sensor->mode.h_end =
+ min(sensor->mode.h_start + width + OV2680_END_MARGIN - 1,
+ OV2680_NATIVE_WIDTH - 1);
+ sensor->mode.v_end =
+ min(sensor->mode.v_start + height + OV2680_END_MARGIN - 1,
+ OV2680_NATIVE_HEIGHT - 1);
+ sensor->mode.h_output_size = orig_width;
+ sensor->mode.v_output_size = orig_height;
+ sensor->mode.hts = OV2680_PIXELS_PER_LINE;
+ sensor->mode.vts = OV2680_LINES_PER_FRAME;
+}
+
+static int ov2680_set_mode(struct ov2680_dev *sensor)
+{
+ u8 sensor_ctrl_0a, inc, fmt1, fmt2;
+ int ret = 0;
+
+ if (sensor->mode.binning) {
+ sensor_ctrl_0a = 0x23;
+ inc = 0x31;
+ fmt1 = 0xc2;
+ fmt2 = 0x01;
+ } else {
+ sensor_ctrl_0a = 0x21;
+ inc = 0x11;
+ fmt1 = 0xc0;
+ fmt2 = 0x00;
+ }
+
+ cci_write(sensor->regmap, OV2680_REG_SENSOR_CTRL_0A,
+ sensor_ctrl_0a, &ret);
+ cci_write(sensor->regmap, OV2680_REG_HORIZONTAL_START,
+ sensor->mode.h_start, &ret);
+ cci_write(sensor->regmap, OV2680_REG_VERTICAL_START,
+ sensor->mode.v_start, &ret);
+ cci_write(sensor->regmap, OV2680_REG_HORIZONTAL_END,
+ sensor->mode.h_end, &ret);
+ cci_write(sensor->regmap, OV2680_REG_VERTICAL_END,
+ sensor->mode.v_end, &ret);
+ cci_write(sensor->regmap, OV2680_REG_HORIZONTAL_OUTPUT_SIZE,
+ sensor->mode.h_output_size, &ret);
+ cci_write(sensor->regmap, OV2680_REG_VERTICAL_OUTPUT_SIZE,
+ sensor->mode.v_output_size, &ret);
+ cci_write(sensor->regmap, OV2680_REG_TIMING_HTS,
+ sensor->mode.hts, &ret);
+ cci_write(sensor->regmap, OV2680_REG_TIMING_VTS,
+ sensor->mode.vts, &ret);
+ cci_write(sensor->regmap, OV2680_REG_ISP_X_WIN, 0, &ret);
+ cci_write(sensor->regmap, OV2680_REG_ISP_Y_WIN, 0, &ret);
+ cci_write(sensor->regmap, OV2680_REG_X_INC, inc, &ret);
+ cci_write(sensor->regmap, OV2680_REG_Y_INC, inc, &ret);
+ cci_write(sensor->regmap, OV2680_REG_X_WIN,
+ sensor->mode.h_output_size, &ret);
+ cci_write(sensor->regmap, OV2680_REG_Y_WIN,
+ sensor->mode.v_output_size, &ret);
+ cci_write(sensor->regmap, OV2680_REG_FORMAT1, fmt1, &ret);
+ cci_write(sensor->regmap, OV2680_REG_FORMAT2, fmt2, &ret);
+
+ return ret;
+}
+
+static int ov2680_set_vflip(struct ov2680_dev *sensor, s32 val)
+{
+ int ret;
+
+ if (sensor->is_streaming)
+ return -EBUSY;
+
+ ret = cci_update_bits(sensor->regmap, OV2680_REG_FORMAT1,
+ BIT(2), val ? BIT(2) : 0, NULL);
+ if (ret < 0)
+ return ret;
+
+ ov2680_set_bayer_order(sensor, &sensor->mode.fmt);
+ return 0;
+}
+
+static int ov2680_set_hflip(struct ov2680_dev *sensor, s32 val)
+{
+ int ret;
+
+ if (sensor->is_streaming)
+ return -EBUSY;
+
+ ret = cci_update_bits(sensor->regmap, OV2680_REG_FORMAT2,
+ BIT(2), val ? BIT(2) : 0, NULL);
+ if (ret < 0)
+ return ret;
+
+ ov2680_set_bayer_order(sensor, &sensor->mode.fmt);
+ return 0;
+}
+
+static int ov2680_test_pattern_set(struct ov2680_dev *sensor, int value)
+{
+ int ret = 0;
+
+ if (!value)
+ return cci_update_bits(sensor->regmap, OV2680_REG_ISP_CTRL00,
+ BIT(7), 0, NULL);
+
+ cci_update_bits(sensor->regmap, OV2680_REG_ISP_CTRL00,
+ 0x03, value - 1, &ret);
+ cci_update_bits(sensor->regmap, OV2680_REG_ISP_CTRL00,
+ BIT(7), BIT(7), &ret);
+
+ return ret;
+}
+
+static int ov2680_gain_set(struct ov2680_dev *sensor, u32 gain)
+{
+ return cci_write(sensor->regmap, OV2680_REG_GAIN_PK, gain, NULL);
+}
+
+static int ov2680_exposure_set(struct ov2680_dev *sensor, u32 exp)
+{
+ return cci_write(sensor->regmap, OV2680_REG_EXPOSURE_PK, exp << 4,
+ NULL);
+}
+
+static int ov2680_stream_enable(struct ov2680_dev *sensor)
+{
+ int ret;
+
+ ret = cci_write(sensor->regmap, OV2680_REG_PLL_MULTIPLIER,
+ sensor->pll_mult, NULL);
+ if (ret < 0)
+ return ret;
+
+ ret = regmap_multi_reg_write(sensor->regmap,
+ ov2680_global_setting,
+ ARRAY_SIZE(ov2680_global_setting));
+ if (ret < 0)
+ return ret;
+
+ ret = ov2680_set_mode(sensor);
+ if (ret < 0)
+ return ret;
+
+ /* Restore value of all ctrls */
+ ret = __v4l2_ctrl_handler_setup(&sensor->ctrls.handler);
+ if (ret < 0)
+ return ret;
+
+ return cci_write(sensor->regmap, OV2680_REG_STREAM_CTRL, 1, NULL);
+}
+
+static int ov2680_stream_disable(struct ov2680_dev *sensor)
+{
+ return cci_write(sensor->regmap, OV2680_REG_STREAM_CTRL, 0, NULL);
+}
+
+static int ov2680_power_off(struct ov2680_dev *sensor)
+{
+ clk_disable_unprepare(sensor->xvclk);
+ ov2680_power_down(sensor);
+ regulator_bulk_disable(OV2680_NUM_SUPPLIES, sensor->supplies);
+ return 0;
+}
+
+static int ov2680_power_on(struct ov2680_dev *sensor)
+{
+ int ret;
+
+ ret = regulator_bulk_enable(OV2680_NUM_SUPPLIES, sensor->supplies);
+ if (ret < 0) {
+ dev_err(sensor->dev, "failed to enable regulators: %d\n", ret);
+ return ret;
+ }
+
+ if (!sensor->pwdn_gpio) {
+ ret = cci_write(sensor->regmap, OV2680_REG_SOFT_RESET, 0x01,
+ NULL);
+ if (ret != 0) {
+ dev_err(sensor->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;
+
+ return 0;
+
+err_disable_regulators:
+ regulator_bulk_disable(OV2680_NUM_SUPPLIES, sensor->supplies);
+ 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->mode.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) {
+ ret = pm_runtime_resume_and_get(sensor->sd.dev);
+ if (ret < 0)
+ goto unlock;
+
+ ret = ov2680_stream_enable(sensor);
+ if (ret < 0) {
+ pm_runtime_put(sensor->sd.dev);
+ goto unlock;
+ }
+ } else {
+ ret = ov2680_stream_disable(sensor);
+ pm_runtime_put(sensor->sd.dev);
+ }
+
+ 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->index != 0)
+ return -EINVAL;
+
+ code->code = sensor->mode.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;
+
+ fmt = __ov2680_get_pad_format(sensor, sd_state, format->pad,
+ format->which);
+
+ mutex_lock(&sensor->lock);
+ 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 v4l2_rect *crop;
+ unsigned int width, height;
+ int ret = 0;
+
+ crop = __ov2680_get_pad_crop(sensor, sd_state, format->pad,
+ format->which);
+
+ /* Limit set_fmt max size to crop width / height */
+ width = clamp_val(ALIGN(format->format.width, 2),
+ OV2680_MIN_CROP_WIDTH, crop->width);
+ height = clamp_val(ALIGN(format->format.height, 2),
+ OV2680_MIN_CROP_HEIGHT, crop->height);
+
+ ov2680_fill_format(sensor, &format->format, width, 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->mode.fmt = format->format;
+ ov2680_calc_mode(sensor);
+
+unlock:
+ mutex_unlock(&sensor->lock);
+
+ return ret;
+}
+
+static int ov2680_get_selection(struct v4l2_subdev *sd,
+ struct v4l2_subdev_state *state,
+ struct v4l2_subdev_selection *sel)
+{
+ struct ov2680_dev *sensor = to_ov2680_dev(sd);
+
+ switch (sel->target) {
+ case V4L2_SEL_TGT_CROP:
+ mutex_lock(&sensor->lock);
+ sel->r = *__ov2680_get_pad_crop(sensor, state, sel->pad,
+ sel->which);
+ mutex_unlock(&sensor->lock);
+ break;
+ case V4L2_SEL_TGT_NATIVE_SIZE:
+ case V4L2_SEL_TGT_CROP_BOUNDS:
+ sel->r.top = 0;
+ sel->r.left = 0;
+ sel->r.width = OV2680_NATIVE_WIDTH;
+ sel->r.height = OV2680_NATIVE_HEIGHT;
+ break;
+ case V4L2_SEL_TGT_CROP_DEFAULT:
+ sel->r = ov2680_default_crop;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int ov2680_set_selection(struct v4l2_subdev *sd,
+ struct v4l2_subdev_state *state,
+ struct v4l2_subdev_selection *sel)
+{
+ struct ov2680_dev *sensor = to_ov2680_dev(sd);
+ struct v4l2_mbus_framefmt *format;
+ struct v4l2_rect *crop;
+ struct v4l2_rect rect;
+
+ if (sel->target != V4L2_SEL_TGT_CROP)
+ return -EINVAL;
+
+ /*
+ * Clamp the boundaries of the crop rectangle to the size of the sensor
+ * pixel array. Align to multiples of 2 to ensure Bayer pattern isn't
+ * disrupted.
+ */
+ rect.left = clamp_val(ALIGN(sel->r.left, 2),
+ OV2680_NATIVE_START_LEFT, OV2680_NATIVE_WIDTH);
+ rect.top = clamp_val(ALIGN(sel->r.top, 2),
+ OV2680_NATIVE_START_TOP, OV2680_NATIVE_HEIGHT);
+ rect.width = clamp_val(ALIGN(sel->r.width, 2),
+ OV2680_MIN_CROP_WIDTH, OV2680_NATIVE_WIDTH);
+ rect.height = clamp_val(ALIGN(sel->r.height, 2),
+ OV2680_MIN_CROP_HEIGHT, OV2680_NATIVE_HEIGHT);
+
+ /* Make sure the crop rectangle isn't outside the bounds of the array */
+ rect.width = min_t(unsigned int, rect.width,
+ OV2680_NATIVE_WIDTH - rect.left);
+ rect.height = min_t(unsigned int, rect.height,
+ OV2680_NATIVE_HEIGHT - rect.top);
+
+ crop = __ov2680_get_pad_crop(sensor, state, sel->pad, sel->which);
+
+ mutex_lock(&sensor->lock);
+ if (rect.width != crop->width || rect.height != crop->height) {
+ /*
+ * Reset the output image size if the crop rectangle size has
+ * been modified.
+ */
+ format = __ov2680_get_pad_format(sensor, state, sel->pad,
+ sel->which);
+ format->width = rect.width;
+ format->height = rect.height;
+ }
+
+ *crop = rect;
+ mutex_unlock(&sensor->lock);
+
+ sel->r = rect;
+
+ return 0;
+}
+
+static int ov2680_init_cfg(struct v4l2_subdev *sd,
+ struct v4l2_subdev_state *sd_state)
+{
+ struct ov2680_dev *sensor = to_ov2680_dev(sd);
+
+ sd_state->pads[0].try_crop = ov2680_default_crop;
+
+ 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)
+{
+ struct ov2680_dev *sensor = to_ov2680_dev(sd);
+ struct v4l2_rect *crop;
+
+ if (fse->index >= OV2680_FRAME_SIZES)
+ return -EINVAL;
+
+ crop = __ov2680_get_pad_crop(sensor, sd_state, fse->pad, fse->which);
+ if (!crop)
+ return -EINVAL;
+
+ fse->min_width = crop->width / (fse->index + 1);
+ fse->min_height = crop->height / (fse->index + 1);
+ fse->max_width = fse->min_width;
+ fse->max_height = fse->min_height;
+
+ return 0;
+}
+
+static bool ov2680_valid_frame_size(struct v4l2_subdev *sd,
+ struct v4l2_subdev_state *sd_state,
+ struct v4l2_subdev_frame_interval_enum *fie)
+{
+ struct v4l2_subdev_frame_size_enum fse = {
+ .pad = fie->pad,
+ .which = fie->which,
+ };
+ int i;
+
+ for (i = 0; i < OV2680_FRAME_SIZES; i++) {
+ fse.index = i;
+
+ if (ov2680_enum_frame_size(sd, sd_state, &fse))
+ return false;
+
+ if (fie->width == fse.min_width &&
+ fie->height == fse.min_height)
+ return true;
+ }
+
+ return false;
+}
+
+static int ov2680_enum_frame_interval(struct v4l2_subdev *sd,
+ struct v4l2_subdev_state *sd_state,
+ struct v4l2_subdev_frame_interval_enum *fie)
+{
+ struct ov2680_dev *sensor = to_ov2680_dev(sd);
+
+ /* Only 1 framerate */
+ if (fie->index || !ov2680_valid_frame_size(sd, sd_state, fie))
+ return -EINVAL;
+
+ fie->interval = sensor->mode.frame_interval;
+
+ 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);
+ int ret;
+
+ /* Only apply changes to the controls if the device is powered up */
+ if (!pm_runtime_get_if_in_use(sensor->sd.dev)) {
+ ov2680_set_bayer_order(sensor, &sensor->mode.fmt);
+ return 0;
+ }
+
+ switch (ctrl->id) {
+ case V4L2_CID_ANALOGUE_GAIN:
+ ret = ov2680_gain_set(sensor, ctrl->val);
+ break;
+ case V4L2_CID_EXPOSURE:
+ ret = ov2680_exposure_set(sensor, ctrl->val);
+ break;
+ case V4L2_CID_VFLIP:
+ ret = ov2680_set_vflip(sensor, ctrl->val);
+ break;
+ case V4L2_CID_HFLIP:
+ ret = ov2680_set_hflip(sensor, ctrl->val);
+ break;
+ case V4L2_CID_TEST_PATTERN:
+ ret = ov2680_test_pattern_set(sensor, ctrl->val);
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+
+ pm_runtime_put(sensor->sd.dev);
+ return ret;
+}
+
+static const struct v4l2_ctrl_ops ov2680_ctrl_ops = {
+ .s_ctrl = ov2680_s_ctrl,
+};
+
+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,
+ .enum_frame_size = ov2680_enum_frame_size,
+ .enum_frame_interval = ov2680_enum_frame_interval,
+ .get_fmt = ov2680_get_fmt,
+ .set_fmt = ov2680_set_fmt,
+ .get_selection = ov2680_get_selection,
+ .set_selection = ov2680_set_selection,
+};
+
+static const struct v4l2_subdev_ops ov2680_subdev_ops = {
+ .video = &ov2680_video_ops,
+ .pad = &ov2680_pad_ops,
+};
+
+static int ov2680_mode_init(struct ov2680_dev *sensor)
+{
+ /* set initial mode */
+ sensor->mode.crop = ov2680_default_crop;
+ ov2680_fill_format(sensor, &sensor->mode.fmt,
+ OV2680_DEFAULT_WIDTH, OV2680_DEFAULT_HEIGHT);
+ ov2680_calc_mode(sensor);
+
+ sensor->mode.frame_interval.denominator = OV2680_FRAME_RATE;
+ sensor->mode.frame_interval.numerator = 1;
+
+ return 0;
+}
+
+static int ov2680_v4l2_register(struct ov2680_dev *sensor)
+{
+ struct i2c_client *client = to_i2c_client(sensor->dev);
+ const struct v4l2_ctrl_ops *ops = &ov2680_ctrl_ops;
+ struct ov2680_ctrls *ctrls = &sensor->ctrls;
+ struct v4l2_ctrl_handler *hdl = &ctrls->handler;
+ int exp_max = OV2680_LINES_PER_FRAME - OV2680_INTEGRATION_TIME_MARGIN;
+ int ret = 0;
+
+ v4l2_i2c_subdev_init(&sensor->sd, 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, exp_max, 1, exp_max);
+
+ ctrls->gain = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_ANALOGUE_GAIN,
+ 0, 1023, 1, 250);
+
+ ctrls->link_freq = v4l2_ctrl_new_int_menu(hdl, NULL, V4L2_CID_LINK_FREQ,
+ 0, 0, sensor->link_freq);
+ ctrls->pixel_rate = v4l2_ctrl_new_std(hdl, NULL, V4L2_CID_PIXEL_RATE,
+ 0, sensor->pixel_rate,
+ 1, sensor->pixel_rate);
+
+ 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;
+ ctrls->link_freq->flags |= V4L2_CTRL_FLAG_READ_ONLY;
+
+ 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->dev,
+ OV2680_NUM_SUPPLIES, sensor->supplies);
+}
+
+static int ov2680_check_id(struct ov2680_dev *sensor)
+{
+ u64 chip_id, rev;
+ int ret = 0;
+
+ cci_read(sensor->regmap, OV2680_REG_CHIP_ID, &chip_id, &ret);
+ cci_read(sensor->regmap, OV2680_REG_SC_CMMN_SUB_ID, &rev, &ret);
+ if (ret < 0) {
+ dev_err(sensor->dev, "failed to read chip id\n");
+ return ret;
+ }
+
+ if (chip_id != OV2680_CHIP_ID) {
+ dev_err(sensor->dev, "chip id: 0x%04llx does not match expected 0x%04x\n",
+ chip_id, OV2680_CHIP_ID);
+ return -ENODEV;
+ }
+
+ dev_info(sensor->dev, "sensor_revision id = 0x%llx, rev= %lld\n",
+ chip_id, rev & 0x0f);
+
+ return 0;
+}
+
+static int ov2680_parse_dt(struct ov2680_dev *sensor)
+{
+ struct v4l2_fwnode_endpoint bus_cfg = {
+ .bus_type = V4L2_MBUS_CSI2_DPHY,
+ };
+ struct device *dev = sensor->dev;
+ struct fwnode_handle *ep_fwnode;
+ struct gpio_desc *gpio;
+ unsigned int rate = 0;
+ int i, ret;
+
+ /*
+ * Sometimes the fwnode graph is initialized by the bridge driver.
+ * Bridge drivers doing this may also add GPIO mappings, wait for this.
+ */
+ ep_fwnode = fwnode_graph_get_next_endpoint(dev_fwnode(dev), NULL);
+ if (!ep_fwnode)
+ return dev_err_probe(dev, -EPROBE_DEFER,
+ "waiting for fwnode graph endpoint\n");
+
+ ret = v4l2_fwnode_endpoint_alloc_parse(ep_fwnode, &bus_cfg);
+ fwnode_handle_put(ep_fwnode);
+ if (ret)
+ return ret;
+
+ /*
+ * The pin we want is named XSHUTDN in the datasheet. Linux sensor
+ * drivers have standardized on using "powerdown" as con-id name
+ * for powerdown or shutdown pins. Older DTB files use "reset",
+ * so fallback to that if there is no "powerdown" pin.
+ */
+ gpio = devm_gpiod_get_optional(dev, "powerdown", GPIOD_OUT_HIGH);
+ if (!gpio)
+ gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
+
+ ret = PTR_ERR_OR_ZERO(gpio);
+ if (ret < 0) {
+ dev_dbg(dev, "error while getting reset gpio: %d\n", ret);
+ goto out_free_bus_cfg;
+ }
+
+ sensor->pwdn_gpio = gpio;
+
+ sensor->xvclk = devm_clk_get_optional(dev, "xvclk");
+ if (IS_ERR(sensor->xvclk)) {
+ ret = dev_err_probe(dev, PTR_ERR(sensor->xvclk),
+ "xvclk clock missing or invalid\n");
+ goto out_free_bus_cfg;
+ }
+
+ /*
+ * We could have either a 24MHz or 19.2MHz clock rate from either DT or
+ * ACPI... but we also need to support the weird IPU3 case which will
+ * have an external clock AND a clock-frequency property. Check for the
+ * clock-frequency property and if found, set that rate if we managed
+ * to acquire a clock. This should cover the ACPI case. If the system
+ * uses devicetree then the configured rate should already be set, so
+ * we can just read it.
+ */
+ ret = fwnode_property_read_u32(dev_fwnode(dev), "clock-frequency",
+ &rate);
+ if (ret && !sensor->xvclk) {
+ dev_err_probe(dev, ret, "invalid clock config\n");
+ goto out_free_bus_cfg;
+ }
+
+ if (!ret && sensor->xvclk) {
+ ret = clk_set_rate(sensor->xvclk, rate);
+ if (ret) {
+ dev_err_probe(dev, ret, "failed to set clock rate\n");
+ goto out_free_bus_cfg;
+ }
+ }
+
+ sensor->xvclk_freq = rate ?: clk_get_rate(sensor->xvclk);
+
+ for (i = 0; i < ARRAY_SIZE(ov2680_xvclk_freqs); i++) {
+ if (sensor->xvclk_freq == ov2680_xvclk_freqs[i])
+ break;
+ }
+
+ if (i == ARRAY_SIZE(ov2680_xvclk_freqs)) {
+ ret = dev_err_probe(dev, -EINVAL,
+ "unsupported xvclk frequency %d Hz\n",
+ sensor->xvclk_freq);
+ goto out_free_bus_cfg;
+ }
+
+ sensor->pll_mult = ov2680_pll_multipliers[i];
+
+ sensor->link_freq[0] = sensor->xvclk_freq / OV2680_PLL_PREDIV0 /
+ OV2680_PLL_PREDIV * sensor->pll_mult;
+
+ /* CSI-2 is double data rate, bus-format is 10 bpp */
+ sensor->pixel_rate = sensor->link_freq[0] * 2;
+ do_div(sensor->pixel_rate, 10);
+
+ /* Verify bus cfg */
+ if (bus_cfg.bus.mipi_csi2.num_data_lanes != 1) {
+ ret = dev_err_probe(dev, -EINVAL,
+ "only a 1-lane CSI2 config is supported");
+ goto out_free_bus_cfg;
+ }
+
+ for (i = 0; i < bus_cfg.nr_of_link_frequencies; i++)
+ if (bus_cfg.link_frequencies[i] == sensor->link_freq[0])
+ break;
+
+ if (bus_cfg.nr_of_link_frequencies == 0 ||
+ bus_cfg.nr_of_link_frequencies == i) {
+ ret = dev_err_probe(dev, -EINVAL,
+ "supported link freq %lld not found\n",
+ sensor->link_freq[0]);
+ goto out_free_bus_cfg;
+ }
+
+out_free_bus_cfg:
+ v4l2_fwnode_endpoint_free(&bus_cfg);
+ return ret;
+}
+
+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->dev = &client->dev;
+
+ sensor->regmap = devm_cci_regmap_init_i2c(client, 16);
+ if (IS_ERR(sensor->regmap))
+ return PTR_ERR(sensor->regmap);
+
+ ret = ov2680_parse_dt(sensor);
+ if (ret < 0)
+ return ret;
+
+ 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);
+
+ /*
+ * Power up and verify the chip now, so that if runtime pm is
+ * disabled the chip is left on and streaming will work.
+ */
+ ret = ov2680_power_on(sensor);
+ if (ret < 0)
+ goto lock_destroy;
+
+ ret = ov2680_check_id(sensor);
+ if (ret < 0)
+ goto err_powerdown;
+
+ pm_runtime_set_active(&client->dev);
+ pm_runtime_get_noresume(&client->dev);
+ pm_runtime_enable(&client->dev);
+
+ ret = ov2680_v4l2_register(sensor);
+ if (ret < 0)
+ goto err_pm_runtime;
+
+ pm_runtime_set_autosuspend_delay(&client->dev, 1000);
+ pm_runtime_use_autosuspend(&client->dev);
+ pm_runtime_put_autosuspend(&client->dev);
+
+ return 0;
+
+err_pm_runtime:
+ pm_runtime_disable(&client->dev);
+ pm_runtime_put_noidle(&client->dev);
+err_powerdown:
+ ov2680_power_off(sensor);
+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);
+
+ /*
+ * Disable runtime PM. In case runtime PM is disabled in the kernel,
+ * make sure to turn power off manually.
+ */
+ pm_runtime_disable(&client->dev);
+ if (!pm_runtime_status_suspended(&client->dev))
+ ov2680_power_off(sensor);
+ pm_runtime_set_suspended(&client->dev);
+}
+
+static int 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 ov2680_power_off(sensor);
+}
+
+static int ov2680_resume(struct device *dev)
+{
+ struct v4l2_subdev *sd = dev_get_drvdata(dev);
+ struct ov2680_dev *sensor = to_ov2680_dev(sd);
+ int ret;
+
+ ret = ov2680_power_on(sensor);
+ if (ret < 0)
+ goto stream_disable;
+
+ 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 DEFINE_RUNTIME_DEV_PM_OPS(ov2680_pm_ops, ov2680_suspend, ov2680_resume,
+ NULL);
+
+static const struct of_device_id ov2680_dt_ids[] = {
+ { .compatible = "ovti,ov2680" },
+ { /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, ov2680_dt_ids);
+
+static const struct acpi_device_id ov2680_acpi_ids[] = {
+ { "OVTI2680" },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(acpi, ov2680_acpi_ids);
+
+static struct i2c_driver ov2680_i2c_driver = {
+ .driver = {
+ .name = "ov2680",
+ .pm = pm_sleep_ptr(&ov2680_pm_ops),
+ .of_match_table = ov2680_dt_ids,
+ .acpi_match_table = ov2680_acpi_ids,
+ },
+ .probe = 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");