--- /dev/null
+/*
+ * Driver for MT9V022 CMOS Image Sensor from Micron
+ *
+ * Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/videodev2.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/delay.h>
+#include <linux/log2.h>
+
+#include <media/v4l2-common.h>
+#include <media/v4l2-chip-ident.h>
+#include <media/soc_camera.h>
+
+#include <asm/gpio.h>
+
+/* mt9v022 i2c address 0x48, 0x4c, 0x58, 0x5c
+ * The platform has to define i2c_board_info
+ * and call i2c_register_board_info() */
+
+static char *sensor_type;
+module_param(sensor_type, charp, S_IRUGO);
+MODULE_PARM_DESC(sensor_type, "Sensor type: \"colour\" or \"monochrome\"\n");
+
+/* mt9v022 selected register addresses */
+#define MT9V022_CHIP_VERSION 0x00
+#define MT9V022_COLUMN_START 0x01
+#define MT9V022_ROW_START 0x02
+#define MT9V022_WINDOW_HEIGHT 0x03
+#define MT9V022_WINDOW_WIDTH 0x04
+#define MT9V022_HORIZONTAL_BLANKING 0x05
+#define MT9V022_VERTICAL_BLANKING 0x06
+#define MT9V022_CHIP_CONTROL 0x07
+#define MT9V022_SHUTTER_WIDTH1 0x08
+#define MT9V022_SHUTTER_WIDTH2 0x09
+#define MT9V022_SHUTTER_WIDTH_CTRL 0x0a
+#define MT9V022_TOTAL_SHUTTER_WIDTH 0x0b
+#define MT9V022_RESET 0x0c
+#define MT9V022_READ_MODE 0x0d
+#define MT9V022_MONITOR_MODE 0x0e
+#define MT9V022_PIXEL_OPERATION_MODE 0x0f
+#define MT9V022_LED_OUT_CONTROL 0x1b
+#define MT9V022_ADC_MODE_CONTROL 0x1c
+#define MT9V022_ANALOG_GAIN 0x34
+#define MT9V022_BLACK_LEVEL_CALIB_CTRL 0x47
+#define MT9V022_PIXCLK_FV_LV 0x74
+#define MT9V022_DIGITAL_TEST_PATTERN 0x7f
+#define MT9V022_AEC_AGC_ENABLE 0xAF
+#define MT9V022_MAX_TOTAL_SHUTTER_WIDTH 0xBD
+
+/* Progressive scan, master, defaults */
+#define MT9V022_CHIP_CONTROL_DEFAULT 0x188
+
+static const struct soc_camera_data_format mt9v022_formats[] = {
+ {
+ .name = "RGB Bayer (sRGB)",
+ .depth = 8,
+ .fourcc = V4L2_PIX_FMT_SBGGR8,
+ .colorspace = V4L2_COLORSPACE_SRGB,
+ }, {
+ .name = "RGB Bayer (sRGB)",
+ .depth = 10,
+ .fourcc = V4L2_PIX_FMT_SBGGR16,
+ .colorspace = V4L2_COLORSPACE_SRGB,
+ }, {
+ .name = "Monochrome 10 bit",
+ .depth = 10,
+ .fourcc = V4L2_PIX_FMT_Y16,
+ }, {
+ .name = "Monochrome 8 bit",
+ .depth = 8,
+ .fourcc = V4L2_PIX_FMT_GREY,
+ },
+};
+
+struct mt9v022 {
+ struct i2c_client *client;
+ struct soc_camera_device icd;
+ int model; /* V4L2_IDENT_MT9M001* codes from v4l2-chip-ident.h */
+ int switch_gpio;
+ u16 chip_control;
+ unsigned char datawidth;
+};
+
+static int reg_read(struct soc_camera_device *icd, const u8 reg)
+{
+ struct mt9v022 *mt9v022 = container_of(icd, struct mt9v022, icd);
+ struct i2c_client *client = mt9v022->client;
+ s32 data = i2c_smbus_read_word_data(client, reg);
+ return data < 0 ? data : swab16(data);
+}
+
+static int reg_write(struct soc_camera_device *icd, const u8 reg,
+ const u16 data)
+{
+ struct mt9v022 *mt9v022 = container_of(icd, struct mt9v022, icd);
+ return i2c_smbus_write_word_data(mt9v022->client, reg, swab16(data));
+}
+
+static int reg_set(struct soc_camera_device *icd, const u8 reg,
+ const u16 data)
+{
+ int ret;
+
+ ret = reg_read(icd, reg);
+ if (ret < 0)
+ return ret;
+ return reg_write(icd, reg, ret | data);
+}
+
+static int reg_clear(struct soc_camera_device *icd, const u8 reg,
+ const u16 data)
+{
+ int ret;
+
+ ret = reg_read(icd, reg);
+ if (ret < 0)
+ return ret;
+ return reg_write(icd, reg, ret & ~data);
+}
+
+static int mt9v022_init(struct soc_camera_device *icd)
+{
+ struct mt9v022 *mt9v022 = container_of(icd, struct mt9v022, icd);
+ int ret;
+
+ /* Almost the default mode: master, parallel, simultaneous, and an
+ * undocumented bit 0x200, which is present in table 7, but not in 8,
+ * plus snapshot mode to disable scan for now */
+ mt9v022->chip_control |= 0x10;
+ ret = reg_write(icd, MT9V022_CHIP_CONTROL, mt9v022->chip_control);
+ if (ret >= 0)
+ reg_write(icd, MT9V022_READ_MODE, 0x300);
+
+ /* All defaults */
+ if (ret >= 0)
+ /* AEC, AGC on */
+ ret = reg_set(icd, MT9V022_AEC_AGC_ENABLE, 0x3);
+ if (ret >= 0)
+ ret = reg_write(icd, MT9V022_MAX_TOTAL_SHUTTER_WIDTH, 480);
+ if (ret >= 0)
+ /* default - auto */
+ ret = reg_clear(icd, MT9V022_BLACK_LEVEL_CALIB_CTRL, 1);
+ if (ret >= 0)
+ ret = reg_write(icd, MT9V022_DIGITAL_TEST_PATTERN, 0);
+
+ return ret >= 0 ? 0 : -EIO;
+}
+
+static int mt9v022_release(struct soc_camera_device *icd)
+{
+ /* Nothing? */
+ return 0;
+}
+
+static int mt9v022_start_capture(struct soc_camera_device *icd)
+{
+ struct mt9v022 *mt9v022 = container_of(icd, struct mt9v022, icd);
+ /* Switch to master "normal" mode */
+ mt9v022->chip_control &= ~0x10;
+ if (reg_write(icd, MT9V022_CHIP_CONTROL,
+ mt9v022->chip_control) < 0)
+ return -EIO;
+ return 0;
+}
+
+static int mt9v022_stop_capture(struct soc_camera_device *icd)
+{
+ struct mt9v022 *mt9v022 = container_of(icd, struct mt9v022, icd);
+ /* Switch to snapshot mode */
+ mt9v022->chip_control |= 0x10;
+ if (reg_write(icd, MT9V022_CHIP_CONTROL,
+ mt9v022->chip_control) < 0)
+ return -EIO;
+ return 0;
+}
+
+static int bus_switch_request(struct mt9v022 *mt9v022, struct soc_camera_link *icl)
+{
+#ifdef CONFIG_MT9V022_PCA9536_SWITCH
+ int ret;
+ unsigned int gpio = icl->gpio;
+
+ if (gpio != NO_GPIO) {
+ /* We have a data bus switch. */
+ ret = gpio_request(gpio, "mt9v022");
+ if (ret < 0) {
+ dev_err(&mt9v022->client->dev, "Cannot get GPIO %u\n", gpio);
+ return ret;
+ }
+
+ ret = gpio_direction_output(gpio, 0);
+ if (ret < 0) {
+ dev_err(&mt9v022->client->dev,
+ "Cannot set GPIO %u to output\n", gpio);
+ gpio_free(gpio);
+ return ret;
+ }
+ }
+
+ mt9v022->switch_gpio = gpio;
+#else
+ mt9v022->switch_gpio = NO_GPIO;
+#endif
+ return 0;
+}
+
+static void bus_switch_release(struct mt9v022 *mt9v022)
+{
+#ifdef CONFIG_MT9V022_PCA9536_SWITCH
+ if (mt9v022->switch_gpio != NO_GPIO)
+ gpio_free(mt9v022->switch_gpio);
+#endif
+}
+
+static int bus_switch_act(struct mt9v022 *mt9v022, int go8bit)
+{
+#ifdef CONFIG_MT9V022_PCA9536_SWITCH
+ if (mt9v022->switch_gpio == NO_GPIO)
+ return -ENODEV;
+
+ gpio_set_value_cansleep(mt9v022->switch_gpio, go8bit);
+ return 0;
+#else
+ return -ENODEV;
+#endif
+}
+
+static int mt9v022_set_capture_format(struct soc_camera_device *icd,
+ __u32 pixfmt, struct v4l2_rect *rect, unsigned int flags)
+{
+ struct mt9v022 *mt9v022 = container_of(icd, struct mt9v022, icd);
+ unsigned int width_flag = flags & (IS_DATAWIDTH_10 | IS_DATAWIDTH_9 |
+ IS_DATAWIDTH_8);
+ u16 pixclk = 0;
+ int ret;
+
+ /* Only one width bit may be set */
+ if (!is_power_of_2(width_flag))
+ return -EINVAL;
+
+ /* The caller provides a supported format, as verified per call to
+ * icd->try_fmt_cap(), datawidth is from our supported format list */
+ switch (pixfmt) {
+ case V4L2_PIX_FMT_GREY:
+ case V4L2_PIX_FMT_Y16:
+ if (mt9v022->model != V4L2_IDENT_MT9V022IX7ATM)
+ return -EINVAL;
+ break;
+ case V4L2_PIX_FMT_SBGGR8:
+ case V4L2_PIX_FMT_SBGGR16:
+ if (mt9v022->model != V4L2_IDENT_MT9V022IX7ATC)
+ return -EINVAL;
+ break;
+ case 0:
+ /* No format change, only geometry */
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ /* Like in example app. Contradicts the datasheet though */
+ ret = reg_read(icd, MT9V022_AEC_AGC_ENABLE);
+ if (ret >= 0) {
+ if (ret & 1) /* Autoexposure */
+ ret = reg_write(icd, MT9V022_MAX_TOTAL_SHUTTER_WIDTH,
+ rect->height + icd->y_skip_top + 43);
+ else
+ ret = reg_write(icd, MT9V022_TOTAL_SHUTTER_WIDTH,
+ rect->height + icd->y_skip_top + 43);
+ }
+ /* Setup frame format: defaults apart from width and height */
+ if (ret >= 0)
+ ret = reg_write(icd, MT9V022_COLUMN_START, rect->left);
+ if (ret >= 0)
+ ret = reg_write(icd, MT9V022_ROW_START, rect->top);
+ if (ret >= 0)
+ /* Default 94, Phytec driver says:
+ * "width + horizontal blank >= 660" */
+ ret = reg_write(icd, MT9V022_HORIZONTAL_BLANKING,
+ rect->width > 660 - 43 ? 43 :
+ 660 - rect->width);
+ if (ret >= 0)
+ ret = reg_write(icd, MT9V022_VERTICAL_BLANKING, 45);
+ if (ret >= 0)
+ ret = reg_write(icd, MT9V022_WINDOW_WIDTH, rect->width);
+ if (ret >= 0)
+ ret = reg_write(icd, MT9V022_WINDOW_HEIGHT,
+ rect->height + icd->y_skip_top);
+
+ if (ret < 0)
+ return ret;
+
+ dev_dbg(&icd->dev, "Frame %ux%u pixel\n", rect->width, rect->height);
+
+ if ((mt9v022->datawidth != 10 && (width_flag == IS_DATAWIDTH_10)) ||
+ (mt9v022->datawidth != 9 && (width_flag == IS_DATAWIDTH_9)) ||
+ (mt9v022->datawidth != 8 && (width_flag == IS_DATAWIDTH_8))) {
+ /* data width switch requested */
+ if (mt9v022->switch_gpio == NO_GPIO)
+ return -EINVAL;
+
+ /* Well, we actually only can do 10 or 8 bits... */
+ if (width_flag == IS_DATAWIDTH_9)
+ return -EINVAL;
+
+ ret = bus_switch_act(mt9v022,
+ width_flag == IS_DATAWIDTH_8);
+ if (ret < 0)
+ return ret;
+
+ mt9v022->datawidth = width_flag == IS_DATAWIDTH_8 ? 8 : 10;
+ }
+
+ if (flags & IS_PCLK_SAMPLE_RISING)
+ pixclk |= 0x10;
+
+ if (!(flags & IS_HSYNC_ACTIVE_HIGH))
+ pixclk |= 0x1;
+
+ if (!(flags & IS_VSYNC_ACTIVE_HIGH))
+ pixclk |= 0x2;
+
+ ret = reg_write(icd, MT9V022_PIXCLK_FV_LV, pixclk);
+ if (ret < 0)
+ return ret;
+
+ if (!(flags & IS_MASTER))
+ mt9v022->chip_control &= ~0x8;
+
+ ret = reg_write(icd, MT9V022_CHIP_CONTROL, mt9v022->chip_control);
+ if (ret < 0)
+ return ret;
+
+ dev_dbg(&icd->dev, "Calculated pixclk 0x%x, chip control 0x%x\n",
+ pixclk, mt9v022->chip_control);
+
+ return 0;
+}
+
+static int mt9v022_try_fmt_cap(struct soc_camera_device *icd,
+ struct v4l2_format *f)
+{
+ if (f->fmt.pix.height < 32 + icd->y_skip_top)
+ f->fmt.pix.height = 32 + icd->y_skip_top;
+ if (f->fmt.pix.height > 480 + icd->y_skip_top)
+ f->fmt.pix.height = 480 + icd->y_skip_top;
+ if (f->fmt.pix.width < 48)
+ f->fmt.pix.width = 48;
+ if (f->fmt.pix.width > 752)
+ f->fmt.pix.width = 752;
+ f->fmt.pix.width &= ~0x03; /* ? */
+
+ return 0;
+}
+
+static int mt9v022_get_chip_id(struct soc_camera_device *icd,
+ struct v4l2_chip_ident *id)
+{
+ struct mt9v022 *mt9v022 = container_of(icd, struct mt9v022, icd);
+
+ if (id->match_type != V4L2_CHIP_MATCH_I2C_ADDR)
+ return -EINVAL;
+
+ if (id->match_chip != mt9v022->client->addr)
+ return -ENODEV;
+
+ id->ident = mt9v022->model;
+ id->revision = 0;
+
+ return 0;
+}
+
+#ifdef CONFIG_VIDEO_ADV_DEBUG
+static int mt9v022_get_register(struct soc_camera_device *icd,
+ struct v4l2_register *reg)
+{
+ struct mt9v022 *mt9v022 = container_of(icd, struct mt9v022, icd);
+
+ if (reg->match_type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff)
+ return -EINVAL;
+
+ if (reg->match_chip != mt9v022->client->addr)
+ return -ENODEV;
+
+ reg->val = reg_read(icd, reg->reg);
+
+ if (reg->val > 0xffff)
+ return -EIO;
+
+ return 0;
+}
+
+static int mt9v022_set_register(struct soc_camera_device *icd,
+ struct v4l2_register *reg)
+{
+ struct mt9v022 *mt9v022 = container_of(icd, struct mt9v022, icd);
+
+ if (reg->match_type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff)
+ return -EINVAL;
+
+ if (reg->match_chip != mt9v022->client->addr)
+ return -ENODEV;
+
+ if (reg_write(icd, reg->reg, reg->val) < 0)
+ return -EIO;
+
+ return 0;
+}
+#endif
+
+static unsigned int mt9v022_get_datawidth(struct soc_camera_device *icd)
+{
+ struct mt9v022 *mt9v022 = container_of(icd, struct mt9v022, icd);
+ return mt9v022->datawidth;
+}
+
+const struct v4l2_queryctrl mt9v022_controls[] = {
+ {
+ .id = V4L2_CID_VFLIP,
+ .type = V4L2_CTRL_TYPE_BOOLEAN,
+ .name = "Flip Vertically",
+ .minimum = 0,
+ .maximum = 1,
+ .step = 1,
+ .default_value = 0,
+ }, {
+ .id = V4L2_CID_HFLIP,
+ .type = V4L2_CTRL_TYPE_BOOLEAN,
+ .name = "Flip Horizontally",
+ .minimum = 0,
+ .maximum = 1,
+ .step = 1,
+ .default_value = 0,
+ }, {
+ .id = V4L2_CID_GAIN,
+ .type = V4L2_CTRL_TYPE_INTEGER,
+ .name = "Analog Gain",
+ .minimum = 64,
+ .maximum = 127,
+ .step = 1,
+ .default_value = 64,
+ .flags = V4L2_CTRL_FLAG_SLIDER,
+ }, {
+ .id = V4L2_CID_EXPOSURE,
+ .type = V4L2_CTRL_TYPE_INTEGER,
+ .name = "Exposure",
+ .minimum = 1,
+ .maximum = 255,
+ .step = 1,
+ .default_value = 255,
+ .flags = V4L2_CTRL_FLAG_SLIDER,
+ }, {
+ .id = V4L2_CID_AUTOGAIN,
+ .type = V4L2_CTRL_TYPE_BOOLEAN,
+ .name = "Automatic Gain",
+ .minimum = 0,
+ .maximum = 1,
+ .step = 1,
+ .default_value = 1,
+ }, {
+ .id = V4L2_CID_EXPOSURE_AUTO,
+ .type = V4L2_CTRL_TYPE_BOOLEAN,
+ .name = "Automatic Exposure",
+ .minimum = 0,
+ .maximum = 1,
+ .step = 1,
+ .default_value = 1,
+ }
+};
+
+static int mt9v022_get_control(struct soc_camera_device *icd,
+ struct v4l2_control *ctrl);
+static int mt9v022_set_control(struct soc_camera_device *icd,
+ struct v4l2_control *ctrl);
+
+static struct soc_camera_ops mt9v022_ops = {
+ .owner = THIS_MODULE,
+ .init = mt9v022_init,
+ .release = mt9v022_release,
+ .start_capture = mt9v022_start_capture,
+ .stop_capture = mt9v022_stop_capture,
+ .set_capture_format = mt9v022_set_capture_format,
+ .try_fmt_cap = mt9v022_try_fmt_cap,
+ .formats = mt9v022_formats,
+ .num_formats = ARRAY_SIZE(mt9v022_formats),
+ .get_datawidth = mt9v022_get_datawidth,
+ .controls = mt9v022_controls,
+ .num_controls = ARRAY_SIZE(mt9v022_controls),
+ .get_control = mt9v022_get_control,
+ .set_control = mt9v022_set_control,
+ .get_chip_id = mt9v022_get_chip_id,
+#ifdef CONFIG_VIDEO_ADV_DEBUG
+ .get_register = mt9v022_get_register,
+ .set_register = mt9v022_set_register,
+#endif
+};
+
+static int mt9v022_get_control(struct soc_camera_device *icd,
+ struct v4l2_control *ctrl)
+{
+ int data;
+
+ switch (ctrl->id) {
+ case V4L2_CID_VFLIP:
+ data = reg_read(icd, MT9V022_READ_MODE);
+ if (data < 0)
+ return -EIO;
+ ctrl->value = !!(data & 0x10);
+ break;
+ case V4L2_CID_HFLIP:
+ data = reg_read(icd, MT9V022_READ_MODE);
+ if (data < 0)
+ return -EIO;
+ ctrl->value = !!(data & 0x20);
+ break;
+ case V4L2_CID_EXPOSURE_AUTO:
+ data = reg_read(icd, MT9V022_AEC_AGC_ENABLE);
+ if (data < 0)
+ return -EIO;
+ ctrl->value = !!(data & 0x1);
+ break;
+ case V4L2_CID_AUTOGAIN:
+ data = reg_read(icd, MT9V022_AEC_AGC_ENABLE);
+ if (data < 0)
+ return -EIO;
+ ctrl->value = !!(data & 0x2);
+ break;
+ }
+ return 0;
+}
+
+static int mt9v022_set_control(struct soc_camera_device *icd,
+ struct v4l2_control *ctrl)
+{
+ int data;
+ const struct v4l2_queryctrl *qctrl;
+
+ qctrl = soc_camera_find_qctrl(&mt9v022_ops, ctrl->id);
+
+ if (!qctrl)
+ return -EINVAL;
+
+ switch (ctrl->id) {
+ case V4L2_CID_VFLIP:
+ if (ctrl->value)
+ data = reg_set(icd, MT9V022_READ_MODE, 0x10);
+ else
+ data = reg_clear(icd, MT9V022_READ_MODE, 0x10);
+ if (data < 0)
+ return -EIO;
+ break;
+ case V4L2_CID_HFLIP:
+ if (ctrl->value)
+ data = reg_set(icd, MT9V022_READ_MODE, 0x20);
+ else
+ data = reg_clear(icd, MT9V022_READ_MODE, 0x20);
+ if (data < 0)
+ return -EIO;
+ break;
+ case V4L2_CID_GAIN:
+ /* mt9v022 has minimum == default */
+ if (ctrl->value > qctrl->maximum || ctrl->value < qctrl->minimum)
+ return -EINVAL;
+ else {
+ unsigned long range = qctrl->maximum - qctrl->minimum;
+ /* Datasheet says 16 to 64. autogain only works properly
+ * after setting gain to maximum 14. Larger values
+ * produce "white fly" noise effect. On the whole,
+ * manually setting analog gain does no good. */
+ unsigned long gain = ((ctrl->value - qctrl->minimum) *
+ 10 + range / 2) / range + 4;
+ if (gain >= 32)
+ gain &= ~1;
+ /* The user wants to set gain manually, hope, she
+ * knows, what she's doing... Switch AGC off. */
+
+ if (reg_clear(icd, MT9V022_AEC_AGC_ENABLE, 0x2) < 0)
+ return -EIO;
+
+ dev_info(&icd->dev, "Setting gain from %d to %lu\n",
+ reg_read(icd, MT9V022_ANALOG_GAIN), gain);
+ if (reg_write(icd, MT9V022_ANALOG_GAIN, gain) < 0)
+ return -EIO;
+ icd->gain = ctrl->value;
+ }
+ break;
+ case V4L2_CID_EXPOSURE:
+ /* mt9v022 has maximum == default */
+ if (ctrl->value > qctrl->maximum || ctrl->value < qctrl->minimum)
+ return -EINVAL;
+ else {
+ unsigned long range = qctrl->maximum - qctrl->minimum;
+ unsigned long shutter = ((ctrl->value - qctrl->minimum) *
+ 479 + range / 2) / range + 1;
+ /* The user wants to set shutter width manually, hope,
+ * she knows, what she's doing... Switch AEC off. */
+
+ if (reg_clear(icd, MT9V022_AEC_AGC_ENABLE, 0x1) < 0)
+ return -EIO;
+
+ dev_dbg(&icd->dev, "Shutter width from %d to %lu\n",
+ reg_read(icd, MT9V022_TOTAL_SHUTTER_WIDTH),
+ shutter);
+ if (reg_write(icd, MT9V022_TOTAL_SHUTTER_WIDTH,
+ shutter) < 0)
+ return -EIO;
+ icd->exposure = ctrl->value;
+ }
+ break;
+ case V4L2_CID_AUTOGAIN:
+ if (ctrl->value)
+ data = reg_set(icd, MT9V022_AEC_AGC_ENABLE, 0x2);
+ else
+ data = reg_clear(icd, MT9V022_AEC_AGC_ENABLE, 0x2);
+ if (data < 0)
+ return -EIO;
+ break;
+ case V4L2_CID_EXPOSURE_AUTO:
+ if (ctrl->value)
+ data = reg_set(icd, MT9V022_AEC_AGC_ENABLE, 0x1);
+ else
+ data = reg_clear(icd, MT9V022_AEC_AGC_ENABLE, 0x1);
+ if (data < 0)
+ return -EIO;
+ break;
+ }
+ return 0;
+}
+
+/* Interface active, can use i2c. If it fails, it can indeed mean, that
+ * this wasn't our capture interface, so, we wait for the right one */
+static int mt9v022_video_probe(struct soc_camera_device *icd)
+{
+ struct mt9v022 *mt9v022 = container_of(icd, struct mt9v022, icd);
+ s32 data;
+ int ret;
+
+ if (!icd->dev.parent ||
+ to_soc_camera_host(icd->dev.parent)->nr != icd->iface)
+ return -ENODEV;
+
+ /* Read out the chip version register */
+ data = reg_read(icd, MT9V022_CHIP_VERSION);
+
+ /* must be 0x1311 or 0x1313 */
+ if (data != 0x1311 && data != 0x1313) {
+ ret = -ENODEV;
+ dev_info(&icd->dev, "No MT9V022 detected, ID register 0x%x\n",
+ data);
+ goto ei2c;
+ }
+
+ /* Soft reset */
+ ret = reg_write(icd, MT9V022_RESET, 1);
+ if (ret < 0)
+ goto ei2c;
+ /* 15 clock cycles */
+ udelay(200);
+ if (reg_read(icd, MT9V022_RESET)) {
+ dev_err(&icd->dev, "Resetting MT9V022 failed!\n");
+ goto ei2c;
+ }
+
+ /* Set monochrome or colour sensor type */
+ if (sensor_type && (!strcmp("colour", sensor_type) ||
+ !strcmp("color", sensor_type))) {
+ ret = reg_write(icd, MT9V022_PIXEL_OPERATION_MODE, 4 | 0x11);
+ mt9v022->model = V4L2_IDENT_MT9V022IX7ATC;
+ } else {
+ ret = reg_write(icd, MT9V022_PIXEL_OPERATION_MODE, 0x11);
+ mt9v022->model = V4L2_IDENT_MT9V022IX7ATM;
+ }
+
+ if (ret >= 0)
+ ret = soc_camera_video_start(icd);
+ if (ret < 0)
+ goto eisis;
+
+ dev_info(&icd->dev, "Detected a MT9V022 chip ID %x, %s sensor\n",
+ data, mt9v022->model == V4L2_IDENT_MT9V022IX7ATM ?
+ "monochrome" : "colour");
+
+ return 0;
+
+eisis:
+ei2c:
+ return ret;
+}
+
+static void mt9v022_video_remove(struct soc_camera_device *icd)
+{
+ struct mt9v022 *mt9v022 = container_of(icd, struct mt9v022, icd);
+
+ dev_dbg(&icd->dev, "Video %x removed: %p, %p\n", mt9v022->client->addr,
+ mt9v022->icd.dev.parent, mt9v022->icd.vdev);
+ soc_camera_video_stop(&mt9v022->icd);
+}
+
+static int mt9v022_probe(struct i2c_client *client)
+{
+ struct mt9v022 *mt9v022;
+ struct soc_camera_device *icd;
+ struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
+ struct soc_camera_link *icl = client->dev.platform_data;
+ int ret;
+
+ if (!icl) {
+ dev_err(&client->dev, "MT9V022 driver needs platform data\n");
+ return -EINVAL;
+ }
+
+ if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) {
+ dev_warn(&adapter->dev,
+ "I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n");
+ return -EIO;
+ }
+
+ mt9v022 = kzalloc(sizeof(struct mt9v022), GFP_KERNEL);
+ if (!mt9v022)
+ return -ENOMEM;
+
+ mt9v022->chip_control = MT9V022_CHIP_CONTROL_DEFAULT;
+ mt9v022->client = client;
+ i2c_set_clientdata(client, mt9v022);
+
+ icd = &mt9v022->icd;
+ icd->probe = mt9v022_video_probe;
+ icd->remove = mt9v022_video_remove;
+ icd->ops = &mt9v022_ops;
+ icd->control = &client->dev;
+ icd->x_min = 1;
+ icd->y_min = 4;
+ icd->x_current = 1;
+ icd->y_current = 4;
+ icd->width_min = 48;
+ icd->width_max = 752;
+ icd->height_min = 32;
+ icd->height_max = 480;
+ icd->y_skip_top = 1;
+ icd->iface = icl->bus_id;
+ /* Default datawidth - this is the only width this camera (normally)
+ * supports. It is only with extra logic that it can support
+ * other widths. Therefore it seems to be a sensible default. */
+ mt9v022->datawidth = 10;
+
+ ret = bus_switch_request(mt9v022, icl);
+ if (ret)
+ goto eswinit;
+
+ ret = soc_camera_device_register(icd);
+ if (ret)
+ goto eisdr;
+
+ return 0;
+
+eisdr:
+ bus_switch_release(mt9v022);
+eswinit:
+ kfree(mt9v022);
+ return ret;
+}
+
+static int mt9v022_remove(struct i2c_client *client)
+{
+ struct mt9v022 *mt9v022 = i2c_get_clientdata(client);
+
+ soc_camera_device_unregister(&mt9v022->icd);
+ bus_switch_release(mt9v022);
+ kfree(mt9v022);
+
+ return 0;
+}
+
+static struct i2c_driver mt9v022_i2c_driver = {
+ .driver = {
+ .name = "mt9v022",
+ },
+ .probe = mt9v022_probe,
+ .remove = mt9v022_remove,
+};
+
+static int __init mt9v022_mod_init(void)
+{
+ return i2c_add_driver(&mt9v022_i2c_driver);
+}
+
+static void __exit mt9v022_mod_exit(void)
+{
+ i2c_del_driver(&mt9v022_i2c_driver);
+}
+
+module_init(mt9v022_mod_init);
+module_exit(mt9v022_mod_exit);
+
+MODULE_DESCRIPTION("Micron MT9V022 Camera driver");
+MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>");
+MODULE_LICENSE("GPL");
projects / linux-2.6 / commitdiff