mt9m001.c

trident tm5600的linux驱动

/*
 * Driver for MT9M001 CMOS Image Sensor from Micron
 *
 * Copyright (C) 2008, Guennadi Liakhovetski <[e-mail]>
 *
 * 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/log2.h>
#include <linux/gpio.h>

#include <media/v4l2-common.h>
#include <media/v4l2-chip-ident.h>
#include <media/soc_camera.h>

/* mt9m001 i2c address 0x5d
 * The platform has to define i2c_board_info
 * and call i2c_register_board_info() */

/* mt9m001 selected register addresses */
#define MT9M001_CHIP_VERSION		0x00
#define MT9M001_ROW_START		0x01
#define MT9M001_COLUMN_START		0x02
#define MT9M001_WINDOW_HEIGHT		0x03
#define MT9M001_WINDOW_WIDTH		0x04
#define MT9M001_HORIZONTAL_BLANKING	0x05
#define MT9M001_VERTICAL_BLANKING	0x06
#define MT9M001_OUTPUT_CONTROL		0x07
#define MT9M001_SHUTTER_WIDTH		0x09
#define MT9M001_FRAME_RESTART		0x0b
#define MT9M001_SHUTTER_DELAY		0x0c
#define MT9M001_RESET			0x0d
#define MT9M001_READ_OPTIONS1		0x1e
#define MT9M001_READ_OPTIONS2		0x20
#define MT9M001_GLOBAL_GAIN		0x35
#define MT9M001_CHIP_ENABLE		0xF1

static const struct soc_camera_data_format mt9m001_colour_formats[] = {
	/* Order important: first natively supported,
	 * second supported with a GPIO extender */
	{
		.name		= "Bayer (sRGB) 10 bit",
		.depth		= 10,
		.fourcc		= V4L2_PIX_FMT_SBGGR16,
		.colorspace	= V4L2_COLORSPACE_SRGB,
	}, {
		.name		= "Bayer (sRGB) 8 bit",
		.depth		= 8,
		.fourcc		= V4L2_PIX_FMT_SBGGR8,
		.colorspace	= V4L2_COLORSPACE_SRGB,
	}
};

static const struct soc_camera_data_format mt9m001_monochrome_formats[] = {
	/* Order important - see above */
	{
		.name		= "Monochrome 10 bit",
		.depth		= 10,
		.fourcc		= V4L2_PIX_FMT_Y16,
	}, {
		.name		= "Monochrome 8 bit",
		.depth		= 8,
		.fourcc		= V4L2_PIX_FMT_GREY,
	},
};

struct mt9m001 {
	struct i2c_client *client;
	struct soc_camera_device icd;
	int model;	/* V4L2_IDENT_MT9M001* codes from v4l2-chip-ident.h */
	int switch_gpio;
	unsigned char autoexposure;
	unsigned char datawidth;
};

static int reg_read(struct soc_camera_device *icd, const u8 reg)
{
	struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
	struct i2c_client *client = mt9m001->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 mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
	return i2c_smbus_write_word_data(mt9m001->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 mt9m001_init(struct soc_camera_device *icd)
{
	struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
	struct soc_camera_link *icl = mt9m001->client->dev.platform_data;
	int ret;

	dev_dbg(icd->vdev->parent, "%s\n", __func__);

	if (icl->power) {
		ret = icl->power(&mt9m001->client->dev, 1);
		if (ret < 0) {
			dev_err(icd->vdev->parent,
				"Platform failed to power-on the camera.\n");
			return ret;
		}
	}

	/* The camera could have been already on, we reset it additionally */
	if (icl->reset)
		ret = icl->reset(&mt9m001->client->dev);
	else
		ret = -ENODEV;

	if (ret < 0) {
		/* Either no platform reset, or platform reset failed */
		ret = reg_write(icd, MT9M001_RESET, 1);
		if (!ret)
			ret = reg_write(icd, MT9M001_RESET, 0);
	}
	/* Disable chip, synchronous option update */
	if (!ret)
		ret = reg_write(icd, MT9M001_OUTPUT_CONTROL, 0);

	return ret;
}

static int mt9m001_release(struct soc_camera_device *icd)
{
	struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
	struct soc_camera_link *icl = mt9m001->client->dev.platform_data;

	/* Disable the chip */
	reg_write(icd, MT9M001_OUTPUT_CONTROL, 0);

	if (icl->power)
		icl->power(&mt9m001->client->dev, 0);

	return 0;
}

static int mt9m001_start_capture(struct soc_camera_device *icd)
{
	/* Switch to master "normal" mode */
	if (reg_write(icd, MT9M001_OUTPUT_CONTROL, 2) < 0)
		return -EIO;
	return 0;
}

static int mt9m001_stop_capture(struct soc_camera_device *icd)
{
	/* Stop sensor readout */
	if (reg_write(icd, MT9M001_OUTPUT_CONTROL, 0) < 0)
		return -EIO;
	return 0;
}

static int bus_switch_request(struct mt9m001 *mt9m001,
			      struct soc_camera_link *icl)
{
#ifdef CONFIG_MT9M001_PCA9536_SWITCH
	int ret;
	unsigned int gpio = icl->gpio;

	if (gpio_is_valid(gpio)) {
		/* We have a data bus switch. */
		ret = gpio_request(gpio, "mt9m001");
		if (ret < 0) {
			dev_err(&mt9m001->client->dev, "Cannot get GPIO %u\n",
				gpio);
			return ret;
		}

		ret = gpio_direction_output(gpio, 0);
		if (ret < 0) {
			dev_err(&mt9m001->client->dev,
				"Cannot set GPIO %u to output\n", gpio);
			gpio_free(gpio);
			return ret;
		}
	}

	mt9m001->switch_gpio = gpio;
#else
	mt9m001->switch_gpio = -EINVAL;
#endif
	return 0;
}

static void bus_switch_release(struct mt9m001 *mt9m001)
{
#ifdef CONFIG_MT9M001_PCA9536_SWITCH
	if (gpio_is_valid(mt9m001->switch_gpio))
		gpio_free(mt9m001->switch_gpio);
#endif
}

static int bus_switch_act(struct mt9m001 *mt9m001, int go8bit)
{
#ifdef CONFIG_MT9M001_PCA9536_SWITCH
	if (!gpio_is_valid(mt9m001->switch_gpio))
		return -ENODEV;

	gpio_set_value_cansleep(mt9m001->switch_gpio, go8bit);
	return 0;
#else
	return -ENODEV;
#endif
}

static int bus_switch_possible(struct mt9m001 *mt9m001)
{
#ifdef CONFIG_MT9M001_PCA9536_SWITCH
	return gpio_is_valid(mt9m001->switch_gpio);
#else
	return 0;
#endif
}

static int mt9m001_set_bus_param(struct soc_camera_device *icd,
				 unsigned long flags)
{
	struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
	unsigned int width_flag = flags & SOCAM_DATAWIDTH_MASK;
	int ret;

	/* Flags validity verified in test_bus_param */

	if ((mt9m001->datawidth != 10 && (width_flag == SOCAM_DATAWIDTH_10)) ||
	    (mt9m001->datawidth != 9  && (width_flag == SOCAM_DATAWIDTH_9)) ||
	    (mt9m001->datawidth != 8  && (width_flag == SOCAM_DATAWIDTH_8))) {
		/* Well, we actually only can do 10 or 8 bits... */
		if (width_flag == SOCAM_DATAWIDTH_9)
			return -EINVAL;
		ret = bus_switch_act(mt9m001,
				     width_flag == SOCAM_DATAWIDTH_8);
		if (ret < 0)
			return ret;

		mt9m001->datawidth = width_flag == SOCAM_DATAWIDTH_8 ? 8 : 10;
	}

	return 0;
}

static unsigned long mt9m001_query_bus_param(struct soc_camera_device *icd)
{
	struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
	unsigned int width_flag = SOCAM_DATAWIDTH_10;

	if (bus_switch_possible(mt9m001))
		width_flag |= SOCAM_DATAWIDTH_8;

	/* MT9M001 has all capture_format parameters fixed */
	return SOCAM_PCLK_SAMPLE_RISING |
		SOCAM_HSYNC_ACTIVE_HIGH |
		SOCAM_VSYNC_ACTIVE_HIGH |
		SOCAM_MASTER |
		width_flag;
}

static int mt9m001_set_fmt_cap(struct soc_camera_device *icd,
		__u32 pixfmt, struct v4l2_rect *rect)
{
	struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
	int ret;
	const u16 hblank = 9, vblank = 25;

	/* Blanking and start values - default... */
	ret = reg_write(icd, MT9M001_HORIZONTAL_BLANKING, hblank);
	if (!ret)
		ret = reg_write(icd, MT9M001_VERTICAL_BLANKING, vblank);

	/* The caller provides a supported format, as verified per
	 * call to icd->try_fmt_cap() */
	if (!ret)
		ret = reg_write(icd, MT9M001_COLUMN_START, rect->left);
	if (!ret)
		ret = reg_write(icd, MT9M001_ROW_START, rect->top);
	if (!ret)
		ret = reg_write(icd, MT9M001_WINDOW_WIDTH, rect->width - 1);
	if (!ret)
		ret = reg_write(icd, MT9M001_WINDOW_HEIGHT,
				rect->height + icd->y_skip_top - 1);
	if (!ret && mt9m001->autoexposure) {
		ret = reg_write(icd, MT9M001_SHUTTER_WIDTH,
				rect->height + icd->y_skip_top + vblank);
		if (!ret) {
			const struct v4l2_queryctrl *qctrl =
				soc_camera_find_qctrl(icd->ops,
						      V4L2_CID_EXPOSURE);
			icd->exposure = (524 + (rect->height + icd->y_skip_top +
						vblank - 1) *
					 (qctrl->maximum - qctrl->minimum)) /
				1048 + qctrl->minimum;
		}
	}

	return ret;
}

static int mt9m001_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 > 1024 + icd->y_skip_top)
		f->fmt.pix.height = 1024 + icd->y_skip_top;
	if (f->fmt.pix.width < 48)
		f->fmt.pix.width = 48;
	if (f->fmt.pix.width > 1280)
		f->fmt.pix.width = 1280;
	f->fmt.pix.width &= ~0x01; /* has to be even, unsure why was ~3 */

	return 0;
}

static int mt9m001_get_chip_id(struct soc_camera_device *icd,
			       struct v4l2_chip_ident *id)
{
	struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);

	if (id->match_type != V4L2_CHIP_MATCH_I2C_ADDR)
		return -EINVAL;

	if (id->match_chip != mt9m001->client->addr)
		return -ENODEV;

	id->ident	= mt9m001->model;
	id->revision	= 0;

	return 0;
}

#ifdef CONFIG_VIDEO_ADV_DEBUG
static int mt9m001_get_register(struct soc_camera_device *icd,
				struct v4l2_register *reg)
{
	struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);

	if (reg->match_type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff)
		return -EINVAL;

	if (reg->match_chip != mt9m001->client->addr)
		return -ENODEV;

	reg->val = reg_read(icd, reg->reg);

	if (reg->val > 0xffff)
		return -EIO;

	return 0;
}

static int mt9m001_set_register(struct soc_camera_device *icd,
				struct v4l2_register *reg)