tcm825x.c

linux 内核源代码

		val |= 0x80;
		tcm825x_write_reg(sensor->i2c_client, 0x02, val);
	}

	return 0;
}

static int ioctl_queryctrl(struct v4l2_int_device *s,
				struct v4l2_queryctrl *qc)
{
	struct vcontrol *control;

	control = find_vctrl(qc->id);

	if (control == NULL)
		return -EINVAL;

	*qc = control->qc;

	return 0;
}

static int ioctl_g_ctrl(struct v4l2_int_device *s,
			     struct v4l2_control *vc)
{
	struct tcm825x_sensor *sensor = s->priv;
	struct i2c_client *client = sensor->i2c_client;
	int val, r;
	struct vcontrol *lvc;

	/* exposure time is special, spread accross 2 registers */
	if (vc->id == V4L2_CID_EXPOSURE) {
		int val_lower, val_upper;

		val_upper = tcm825x_read_reg(client,
					     TCM825X_ADDR(TCM825X_ESRSPD_U));
		if (val_upper < 0)
			return val_upper;
		val_lower = tcm825x_read_reg(client,
					     TCM825X_ADDR(TCM825X_ESRSPD_L));
		if (val_lower < 0)
			return val_lower;

		vc->value = ((val_upper & 0x1f) << 8) | (val_lower);
		return 0;
	}

	lvc = find_vctrl(vc->id);
	if (lvc == NULL)
		return -EINVAL;

	r = tcm825x_read_reg(client, TCM825X_ADDR(lvc->reg));
	if (r < 0)
		return r;
	val = r & TCM825X_MASK(lvc->reg);
	val >>= lvc->start_bit;

	if (val < 0)
		return val;

	vc->value = val;
	return 0;
}

static int ioctl_s_ctrl(struct v4l2_int_device *s,
			     struct v4l2_control *vc)
{
	struct tcm825x_sensor *sensor = s->priv;
	struct i2c_client *client = sensor->i2c_client;
	struct vcontrol *lvc;
	int val = vc->value;

	/* exposure time is special, spread accross 2 registers */
	if (vc->id == V4L2_CID_EXPOSURE) {
		int val_lower, val_upper;
		val_lower = val & TCM825X_MASK(TCM825X_ESRSPD_L);
		val_upper = (val >> 8) & TCM825X_MASK(TCM825X_ESRSPD_U);

		if (tcm825x_write_reg_mask(client,
					   TCM825X_ESRSPD_U, val_upper))
			return -EIO;

		if (tcm825x_write_reg_mask(client,
					   TCM825X_ESRSPD_L, val_lower))
			return -EIO;

		return 0;
	}

	lvc = find_vctrl(vc->id);
	if (lvc == NULL)
		return -EINVAL;

	val = val << lvc->start_bit;
	if (tcm825x_write_reg_mask(client, lvc->reg, val))
		return -EIO;

	return 0;
}

static int ioctl_enum_fmt_cap(struct v4l2_int_device *s,
				   struct v4l2_fmtdesc *fmt)
{
	int index = fmt->index;

	switch (fmt->type) {
	case V4L2_BUF_TYPE_VIDEO_CAPTURE:
		if (index >= TCM825X_NUM_CAPTURE_FORMATS)
			return -EINVAL;
		break;

	default:
		return -EINVAL;
	}

	fmt->flags = tcm825x_formats[index].flags;
	strlcpy(fmt->description, tcm825x_formats[index].description,
		sizeof(fmt->description));
	fmt->pixelformat = tcm825x_formats[index].pixelformat;

	return 0;
}

static int ioctl_try_fmt_cap(struct v4l2_int_device *s,
			     struct v4l2_format *f)
{
	struct tcm825x_sensor *sensor = s->priv;
	enum image_size isize;
	int ifmt;
	struct v4l2_pix_format *pix = &f->fmt.pix;

	isize = tcm825x_find_size(s, pix->width, pix->height);
	dev_dbg(&sensor->i2c_client->dev, "isize = %d num_capture = %lu\n",
		isize, (unsigned long)TCM825X_NUM_CAPTURE_FORMATS);

	pix->width = tcm825x_sizes[isize].width;
	pix->height = tcm825x_sizes[isize].height;

	for (ifmt = 0; ifmt < TCM825X_NUM_CAPTURE_FORMATS; ifmt++)
		if (pix->pixelformat == tcm825x_formats[ifmt].pixelformat)
			break;

	if (ifmt == TCM825X_NUM_CAPTURE_FORMATS)
		ifmt = 0;	/* Default = YUV 4:2:2 */

	pix->pixelformat = tcm825x_formats[ifmt].pixelformat;
	pix->field = V4L2_FIELD_NONE;
	pix->bytesperline = pix->width * TCM825X_BYTES_PER_PIXEL;
	pix->sizeimage = pix->bytesperline * pix->height;
	pix->priv = 0;
	dev_dbg(&sensor->i2c_client->dev, "format = 0x%08x\n",
		pix->pixelformat);

	switch (pix->pixelformat) {
	case V4L2_PIX_FMT_UYVY:
	default:
		pix->colorspace = V4L2_COLORSPACE_JPEG;
		break;
	case V4L2_PIX_FMT_RGB565:
		pix->colorspace = V4L2_COLORSPACE_SRGB;
		break;
	}

	return 0;
}

static int ioctl_s_fmt_cap(struct v4l2_int_device *s,
				struct v4l2_format *f)
{
	struct tcm825x_sensor *sensor = s->priv;
	struct v4l2_pix_format *pix = &f->fmt.pix;
	int rval;

	rval = ioctl_try_fmt_cap(s, f);
	if (rval)
		return rval;

	rval = tcm825x_configure(s);

	sensor->pix = *pix;

	return rval;
}

static int ioctl_g_fmt_cap(struct v4l2_int_device *s,
				struct v4l2_format *f)
{
	struct tcm825x_sensor *sensor = s->priv;

	f->fmt.pix = sensor->pix;

	return 0;
}

static int ioctl_g_parm(struct v4l2_int_device *s,
			     struct v4l2_streamparm *a)
{
	struct tcm825x_sensor *sensor = s->priv;
	struct v4l2_captureparm *cparm = &a->parm.capture;

	if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
		return -EINVAL;

	memset(a, 0, sizeof(*a));
	a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;

	cparm->capability = V4L2_CAP_TIMEPERFRAME;
	cparm->timeperframe = sensor->timeperframe;

	return 0;
}

static int ioctl_s_parm(struct v4l2_int_device *s,
			     struct v4l2_streamparm *a)
{
	struct tcm825x_sensor *sensor = s->priv;
	struct v4l2_fract *timeperframe = &a->parm.capture.timeperframe;
	u32 tgt_fps;	/* target frames per secound */
	int rval;

	if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
		return -EINVAL;

	if ((timeperframe->numerator == 0)
	    || (timeperframe->denominator == 0)) {
		timeperframe->denominator = DEFAULT_FPS;
		timeperframe->numerator = 1;
	}

	tgt_fps = timeperframe->denominator / timeperframe->numerator;

	if (tgt_fps > MAX_FPS) {
		timeperframe->denominator = MAX_FPS;
		timeperframe->numerator = 1;
	} else if (tgt_fps < MIN_FPS) {
		timeperframe->denominator = MIN_FPS;
		timeperframe->numerator = 1;
	}

	sensor->timeperframe = *timeperframe;

	rval = tcm825x_configure(s);

	return rval;
}

static int ioctl_s_power(struct v4l2_int_device *s, int on)
{
	struct tcm825x_sensor *sensor = s->priv;

	return sensor->platform_data->power_set(on);
}

/*
 * Given the image capture format in pix, the nominal frame period in
 * timeperframe, calculate the required xclk frequency.
 *
 * TCM825X input frequency characteristics are:
 *     Minimum 11.9 MHz, Typical 24.57 MHz and maximum 25/27 MHz
 */

static int ioctl_g_ifparm(struct v4l2_int_device *s, struct v4l2_ifparm *p)
{
	struct tcm825x_sensor *sensor = s->priv;
	struct v4l2_fract *timeperframe = &sensor->timeperframe;
	u32 tgt_xclk;	/* target xclk */
	u32 tgt_fps;	/* target frames per secound */
	int rval;

	rval = sensor->platform_data->ifparm(p);
	if (rval)
		return rval;

	tgt_fps = timeperframe->denominator / timeperframe->numerator;

	tgt_xclk = (tgt_fps <= HIGH_FPS_MODE_LOWER_LIMIT) ?
		(2457 * tgt_fps) / MAX_HALF_FPS :
		(2457 * tgt_fps) / MAX_FPS;
	tgt_xclk *= 10000;

	tgt_xclk = min(tgt_xclk, (u32)TCM825X_XCLK_MAX);
	tgt_xclk = max(tgt_xclk, (u32)TCM825X_XCLK_MIN);

	p->u.bt656.clock_curr = tgt_xclk;

	return 0;
}

static int ioctl_g_needs_reset(struct v4l2_int_device *s, void *buf)
{
	struct tcm825x_sensor *sensor = s->priv;

	return sensor->platform_data->needs_reset(s, buf, &sensor->pix);
}

static int ioctl_reset(struct v4l2_int_device *s)
{
	return -EBUSY;
}

static int ioctl_init(struct v4l2_int_device *s)
{
	return tcm825x_configure(s);
}

static int ioctl_dev_exit(struct v4l2_int_device *s)
{
	return 0;
}

static int ioctl_dev_init(struct v4l2_int_device *s)
{
	struct tcm825x_sensor *sensor = s->priv;
	int r;

	r = tcm825x_read_reg(sensor->i2c_client, 0x01);
	if (r < 0)
		return r;
	if (r == 0) {
		dev_err(&sensor->i2c_client->dev, "device not detected\n");
		return -EIO;
	}
	return 0;
}

static struct v4l2_int_ioctl_desc tcm825x_ioctl_desc[] = {
	{ vidioc_int_dev_init_num,
	  (v4l2_int_ioctl_func *)ioctl_dev_init },
	{ vidioc_int_dev_exit_num,
	  (v4l2_int_ioctl_func *)ioctl_dev_exit },
	{ vidioc_int_s_power_num,
	  (v4l2_int_ioctl_func *)ioctl_s_power },
	{ vidioc_int_g_ifparm_num,
	  (v4l2_int_ioctl_func *)ioctl_g_ifparm },
	{ vidioc_int_g_needs_reset_num,
	  (v4l2_int_ioctl_func *)ioctl_g_needs_reset },
	{ vidioc_int_reset_num,
	  (v4l2_int_ioctl_func *)ioctl_reset },
	{ vidioc_int_init_num,
	  (v4l2_int_ioctl_func *)ioctl_init },
	{ vidioc_int_enum_fmt_cap_num,
	  (v4l2_int_ioctl_func *)ioctl_enum_fmt_cap },
	{ vidioc_int_try_fmt_cap_num,
	  (v4l2_int_ioctl_func *)ioctl_try_fmt_cap },
	{ vidioc_int_g_fmt_cap_num,
	  (v4l2_int_ioctl_func *)ioctl_g_fmt_cap },
	{ vidioc_int_s_fmt_cap_num,
	  (v4l2_int_ioctl_func *)ioctl_s_fmt_cap },
	{ vidioc_int_g_parm_num,
	  (v4l2_int_ioctl_func *)ioctl_g_parm },
	{ vidioc_int_s_parm_num,
	  (v4l2_int_ioctl_func *)ioctl_s_parm },
	{ vidioc_int_queryctrl_num,
	  (v4l2_int_ioctl_func *)ioctl_queryctrl },
	{ vidioc_int_g_ctrl_num,
	  (v4l2_int_ioctl_func *)ioctl_g_ctrl },
	{ vidioc_int_s_ctrl_num,
	  (v4l2_int_ioctl_func *)ioctl_s_ctrl },
};

static struct v4l2_int_slave tcm825x_slave = {
	.ioctls = tcm825x_ioctl_desc,
	.num_ioctls = ARRAY_SIZE(tcm825x_ioctl_desc),
};

static struct tcm825x_sensor tcm825x;

static struct v4l2_int_device tcm825x_int_device = {
	.module = THIS_MODULE,
	.name = TCM825X_NAME,
	.priv = &tcm825x,
	.type = v4l2_int_type_slave,
	.u = {
		.slave = &tcm825x_slave,
	},
};

static int tcm825x_probe(struct i2c_client *client)
{
	struct tcm825x_sensor *sensor = &tcm825x;
	int rval;

	if (i2c_get_clientdata(client))
		return -EBUSY;

	sensor->platform_data = client->dev.platform_data;

	if (sensor->platform_data == NULL
	    && !sensor->platform_data->is_okay())
		return -ENODEV;

	sensor->v4l2_int_device = &tcm825x_int_device;

	sensor->i2c_client = client;
	i2c_set_clientdata(client, sensor);

	/* Make the default capture format QVGA RGB565 */
	sensor->pix.width = tcm825x_sizes[QVGA].width;
	sensor->pix.height = tcm825x_sizes[QVGA].height;
	sensor->pix.pixelformat = V4L2_PIX_FMT_RGB565;

	rval = v4l2_int_device_register(sensor->v4l2_int_device);
	if (rval)
		i2c_set_clientdata(client, NULL);

	return rval;
}

static int __exit tcm825x_remove(struct i2c_client *client)
{
	struct tcm825x_sensor *sensor = i2c_get_clientdata(client);

	if (!client->adapter)
		return -ENODEV;	/* our client isn't attached */

	v4l2_int_device_unregister(sensor->v4l2_int_device);
	i2c_set_clientdata(client, NULL);

	return 0;
}

static struct i2c_driver tcm825x_i2c_driver = {
	.driver	= {
		.name = TCM825X_NAME,
	},
	.probe	= tcm825x_probe,
	.remove	= __exit_p(tcm825x_remove),
};

static struct tcm825x_sensor tcm825x = {
	.timeperframe = {
		.numerator   = 1,
		.denominator = DEFAULT_FPS,
	},
};

static int __init tcm825x_init(void)
{
	int rval;

	rval = i2c_add_driver(&tcm825x_i2c_driver);
	if (rval)
		printk(KERN_INFO "%s: failed registering " TCM825X_NAME "\n",
		       __FUNCTION__);

	return rval;
}

static void __exit tcm825x_exit(void)
{
	i2c_del_driver(&tcm825x_i2c_driver);
}

/*
 * FIXME: Menelaus isn't ready (?) at module_init stage, so use
 * late_initcall for now.
 */
late_initcall(tcm825x_init);
module_exit(tcm825x_exit);

MODULE_AUTHOR("Sakari Ailus <[e-mail]>");
MODULE_DESCRIPTION("TCM825x camera sensor driver");
MODULE_LICENSE("GPL");