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[media] media: ov5642: Add support for arbitrary resolution

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This patch adds the ability to get arbitrary resolutions with a width
up to 2592 and a height up to 720 pixels instead of the standard 1280x720
only.

Signed-off-by: Bastian Hecht <hechtb@gmail.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Bastian Hecht 2011-09-08 13:15:24 -03:00 committed by Mauro Carvalho Chehab
parent 95d20109ad
commit 171f1a48bb
1 changed files with 167 additions and 73 deletions
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234
drivers/media/video/ov5642.c
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@ -14,8 +14,10 @@
* published by the Free Software Foundation.
*/
#include <linux/bitops.h>
#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/videodev2.h>
#include <linux/module.h>
@ -45,20 +47,45 @@
#define REG_OUT_TOTAL_WIDTH_LOW 0x380d
#define REG_OUT_TOTAL_HEIGHT_HIGH 0x380e
#define REG_OUT_TOTAL_HEIGHT_LOW 0x380f
#define REG_OUTPUT_FORMAT 0x4300
#define REG_ISP_CTRL_01 0x5001
#define REG_AVG_WINDOW_END_X_HIGH 0x5682
#define REG_AVG_WINDOW_END_X_LOW 0x5683
#define REG_AVG_WINDOW_END_Y_HIGH 0x5686
#define REG_AVG_WINDOW_END_Y_LOW 0x5687
/*
* define standard resolution.
* Works currently only for up to 720 lines
* eg. 320x240, 640x480, 800x600, 1280x720, 2048x720
*/
#define OV5642_WIDTH 1280
#define OV5642_HEIGHT 720
#define OV5642_TOTAL_WIDTH 3200
#define OV5642_TOTAL_HEIGHT 2000
/* active pixel array size */
#define OV5642_SENSOR_SIZE_X 2592
#define OV5642_SENSOR_SIZE_Y 1944
/*
* About OV5642 resolution, cropping and binning:
* This sensor supports it all, at least in the feature description.
* Unfortunately, no combination of appropriate registers settings could make
* the chip work the intended way. As it works with predefined register lists,
* some undocumented registers are presumably changed there to achieve their
* goals.
* This driver currently only works for resolutions up to 720 lines with a
* 1:1 scale. Hopefully these restrictions will be removed in the future.
*/
#define OV5642_MAX_WIDTH OV5642_SENSOR_SIZE_X
#define OV5642_MAX_HEIGHT 720
/* default sizes */
#define OV5642_DEFAULT_WIDTH 1280
#define OV5642_DEFAULT_HEIGHT OV5642_MAX_HEIGHT
/* minimum extra blanking */
#define BLANKING_EXTRA_WIDTH 500
#define BLANKING_EXTRA_HEIGHT 20
/*
* the sensor's autoexposure is buggy when setting total_height low.
* It tries to expose longer than 1 frame period without taking care of it
* and this leads to weird output. So we set 1000 lines as minimum.
*/
#define BLANKING_MIN_HEIGHT 1000
struct regval_list {
u16 reg_num;
u8 value;
@ -582,6 +609,11 @@ struct ov5642_datafmt {
struct ov5642 {
struct v4l2_subdev subdev;
const struct ov5642_datafmt *fmt;
struct v4l2_rect crop_rect;
/* blanking information */
int total_width;
int total_height;
};
static const struct ov5642_datafmt ov5642_colour_fmts[] = {
@ -642,6 +674,21 @@ static int reg_write(struct i2c_client *client, u16 reg, u8 val)
return 0;
}
/*
* convenience function to write 16 bit register values that are split up
* into two consecutive high and low parts
*/
static int reg_write16(struct i2c_client *client, u16 reg, u16 val16)
{
int ret;
ret = reg_write(client, reg, val16 >> 8);
if (ret)
return ret;
return reg_write(client, reg + 1, val16 & 0x00ff);
}
#ifdef CONFIG_VIDEO_ADV_DEBUG
static int ov5642_get_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg)
{
@ -685,58 +732,55 @@ static int ov5642_write_array(struct i2c_client *client,
return 0;
}
static int ov5642_set_resolution(struct i2c_client *client)
static int ov5642_set_resolution(struct v4l2_subdev *sd)
{
struct i2c_client *client = v4l2_get_subdevdata(sd);
struct ov5642 *priv = to_ov5642(client);
int width = priv->crop_rect.width;
int height = priv->crop_rect.height;
int total_width = priv->total_width;
int total_height = priv->total_height;
int start_x = (OV5642_SENSOR_SIZE_X - width) / 2;
int start_y = (OV5642_SENSOR_SIZE_Y - height) / 2;
int ret;
u8 start_x_high = ((OV5642_SENSOR_SIZE_X - OV5642_WIDTH) / 2) >> 8;
u8 start_x_low = ((OV5642_SENSOR_SIZE_X - OV5642_WIDTH) / 2) & 0xff;
u8 start_y_high = ((OV5642_SENSOR_SIZE_Y - OV5642_HEIGHT) / 2) >> 8;
u8 start_y_low = ((OV5642_SENSOR_SIZE_Y - OV5642_HEIGHT) / 2) & 0xff;
u8 width_high = OV5642_WIDTH >> 8;
u8 width_low = OV5642_WIDTH & 0xff;
u8 height_high = OV5642_HEIGHT >> 8;
u8 height_low = OV5642_HEIGHT & 0xff;
u8 total_width_high = OV5642_TOTAL_WIDTH >> 8;
u8 total_width_low = OV5642_TOTAL_WIDTH & 0xff;
u8 total_height_high = OV5642_TOTAL_HEIGHT >> 8;
u8 total_height_low = OV5642_TOTAL_HEIGHT & 0xff;
ret = reg_write(client, REG_WINDOW_START_X_HIGH, start_x_high);
/*
* This should set the starting point for cropping.
* Doesn't work so far.
*/
ret = reg_write16(client, REG_WINDOW_START_X_HIGH, start_x);
if (!ret)
ret = reg_write(client, REG_WINDOW_START_X_LOW, start_x_low);
if (!ret)
ret = reg_write(client, REG_WINDOW_START_Y_HIGH, start_y_high);
if (!ret)
ret = reg_write(client, REG_WINDOW_START_Y_LOW, start_y_low);
ret = reg_write16(client, REG_WINDOW_START_Y_HIGH, start_y);
if (!ret) {
priv->crop_rect.left = start_x;
priv->crop_rect.top = start_y;
}
if (!ret)
ret = reg_write(client, REG_WINDOW_WIDTH_HIGH, width_high);
ret = reg_write16(client, REG_WINDOW_WIDTH_HIGH, width);
if (!ret)
ret = reg_write(client, REG_WINDOW_WIDTH_LOW , width_low);
if (!ret)
ret = reg_write(client, REG_WINDOW_HEIGHT_HIGH, height_high);
if (!ret)
ret = reg_write(client, REG_WINDOW_HEIGHT_LOW, height_low);
ret = reg_write16(client, REG_WINDOW_HEIGHT_HIGH, height);
if (ret)
return ret;
priv->crop_rect.width = width;
priv->crop_rect.height = height;
/* Set the output window size. Only 1:1 scale is supported so far. */
ret = reg_write16(client, REG_OUT_WIDTH_HIGH, width);
if (!ret)
ret = reg_write(client, REG_OUT_WIDTH_HIGH, width_high);
if (!ret)
ret = reg_write(client, REG_OUT_WIDTH_LOW , width_low);
if (!ret)
ret = reg_write(client, REG_OUT_HEIGHT_HIGH, height_high);
if (!ret)
ret = reg_write(client, REG_OUT_HEIGHT_LOW, height_low);
ret = reg_write16(client, REG_OUT_HEIGHT_HIGH, height);
/* Total width = output size + blanking */
if (!ret)
ret = reg_write(client, REG_OUT_TOTAL_WIDTH_HIGH, total_width_high);
ret = reg_write16(client, REG_OUT_TOTAL_WIDTH_HIGH, total_width);
if (!ret)
ret = reg_write(client, REG_OUT_TOTAL_WIDTH_LOW, total_width_low);
ret = reg_write16(client, REG_OUT_TOTAL_HEIGHT_HIGH, total_height);
/* Sets the window for AWB calculations */
if (!ret)
ret = reg_write(client, REG_OUT_TOTAL_HEIGHT_HIGH, total_height_high);
ret = reg_write16(client, REG_AVG_WINDOW_END_X_HIGH, width);
if (!ret)
ret = reg_write(client, REG_OUT_TOTAL_HEIGHT_LOW, total_height_low);
ret = reg_write16(client, REG_AVG_WINDOW_END_Y_HIGH, height);
return ret;
}
@ -744,18 +788,18 @@ static int ov5642_set_resolution(struct i2c_client *client)
static int ov5642_try_fmt(struct v4l2_subdev *sd,
struct v4l2_mbus_framefmt *mf)
{
struct i2c_client *client = v4l2_get_subdevdata(sd);
struct ov5642 *priv = to_ov5642(client);
const struct ov5642_datafmt *fmt = ov5642_find_datafmt(mf->code);
dev_dbg(sd->v4l2_dev->dev, "%s(%u) width: %u heigth: %u\n",
__func__, mf->code, mf->width, mf->height);
mf->width = priv->crop_rect.width;
mf->height = priv->crop_rect.height;
if (!fmt) {
mf->code = ov5642_colour_fmts[0].code;
mf->colorspace = ov5642_colour_fmts[0].colorspace;
}
mf->width = OV5642_WIDTH;
mf->height = OV5642_HEIGHT;
mf->field = V4L2_FIELD_NONE;
return 0;
@ -767,20 +811,13 @@ static int ov5642_s_fmt(struct v4l2_subdev *sd,
struct i2c_client *client = v4l2_get_subdevdata(sd);
struct ov5642 *priv = to_ov5642(client);
dev_dbg(sd->v4l2_dev->dev, "%s(%u)\n", __func__, mf->code);
/* MIPI CSI could have changed the format, double-check */
if (!ov5642_find_datafmt(mf->code))
return -EINVAL;
ov5642_try_fmt(sd, mf);
priv->fmt = ov5642_find_datafmt(mf->code);
ov5642_write_array(client, ov5642_default_regs_init);
ov5642_set_resolution(client);
ov5642_write_array(client, ov5642_default_regs_finalise);
return 0;
}
@ -794,8 +831,8 @@ static int ov5642_g_fmt(struct v4l2_subdev *sd,
mf->code = fmt->code;
mf->colorspace = fmt->colorspace;
mf->width = OV5642_WIDTH;
mf->height = OV5642_HEIGHT;
mf->width = priv->crop_rect.width;
mf->height = priv->crop_rect.height;
mf->field = V4L2_FIELD_NONE;
return 0;
@ -828,15 +865,44 @@ static int ov5642_g_chip_ident(struct v4l2_subdev *sd,
return 0;
}
static int ov5642_s_crop(struct v4l2_subdev *sd, struct v4l2_crop *a)
{
struct i2c_client *client = v4l2_get_subdevdata(sd);
struct ov5642 *priv = to_ov5642(client);
struct v4l2_rect *rect = &a->c;
int ret;
v4l_bound_align_image(&rect->width, 48, OV5642_MAX_WIDTH, 1,
&rect->height, 32, OV5642_MAX_HEIGHT, 1, 0);
priv->crop_rect.width = rect->width;
priv->crop_rect.height = rect->height;
priv->total_width = rect->width + BLANKING_EXTRA_WIDTH;
priv->total_height = max_t(int, rect->height +
BLANKING_EXTRA_HEIGHT,
BLANKING_MIN_HEIGHT);
priv->crop_rect.width = rect->width;
priv->crop_rect.height = rect->height;
ret = ov5642_write_array(client, ov5642_default_regs_init);
if (!ret)
ret = ov5642_set_resolution(sd);
if (!ret)
ret = ov5642_write_array(client, ov5642_default_regs_finalise);
return ret;
}
static int ov5642_g_crop(struct v4l2_subdev *sd, struct v4l2_crop *a)
{
struct i2c_client *client = v4l2_get_subdevdata(sd);
struct ov5642 *priv = to_ov5642(client);
struct v4l2_rect *rect = &a->c;
a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
rect->top = 0;
rect->left = 0;
rect->width = OV5642_WIDTH;
rect->height = OV5642_HEIGHT;
if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
return -EINVAL;
*rect = priv->crop_rect;
return 0;
}
@ -845,8 +911,8 @@ static int ov5642_cropcap(struct v4l2_subdev *sd, struct v4l2_cropcap *a)
{
a->bounds.left = 0;
a->bounds.top = 0;
a->bounds.width = OV5642_WIDTH;
a->bounds.height = OV5642_HEIGHT;
a->bounds.width = OV5642_MAX_WIDTH;
a->bounds.height = OV5642_MAX_HEIGHT;
a->defrect = a->bounds;
a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
a->pixelaspect.numerator = 1;
@ -859,24 +925,43 @@ static int ov5642_g_mbus_config(struct v4l2_subdev *sd,
struct v4l2_mbus_config *cfg)
{
cfg->type = V4L2_MBUS_CSI2;
cfg->flags = V4L2_MBUS_CSI2_2_LANE |
V4L2_MBUS_CSI2_CHANNEL_0 |
cfg->flags = V4L2_MBUS_CSI2_2_LANE | V4L2_MBUS_CSI2_CHANNEL_0 |
V4L2_MBUS_CSI2_CONTINUOUS_CLOCK;
return 0;
}
static int ov5642_s_power(struct v4l2_subdev *sd, int on)
{
struct i2c_client *client;
int ret;
if (!on)
return 0;
client = v4l2_get_subdevdata(sd);
ret = ov5642_write_array(client, ov5642_default_regs_init);
if (!ret)
ret = ov5642_set_resolution(sd);
if (!ret)
ret = ov5642_write_array(client, ov5642_default_regs_finalise);
return ret;
}
static struct v4l2_subdev_video_ops ov5642_subdev_video_ops = {
.s_mbus_fmt = ov5642_s_fmt,
.g_mbus_fmt = ov5642_g_fmt,
.try_mbus_fmt = ov5642_try_fmt,
.enum_mbus_fmt = ov5642_enum_fmt,
.s_crop = ov5642_s_crop,
.g_crop = ov5642_g_crop,
.cropcap = ov5642_cropcap,
.g_mbus_config = ov5642_g_mbus_config,
};
static struct v4l2_subdev_core_ops ov5642_subdev_core_ops = {
.s_power = ov5642_s_power,
.g_chip_ident = ov5642_g_chip_ident,
#ifdef CONFIG_VIDEO_ADV_DEBUG
.g_register = ov5642_get_register,
@ -936,6 +1021,15 @@ static int ov5642_probe(struct i2c_client *client,
priv->fmt = &ov5642_colour_fmts[0];
priv->crop_rect.width = OV5642_DEFAULT_WIDTH;
priv->crop_rect.height = OV5642_DEFAULT_HEIGHT;
priv->crop_rect.left = (OV5642_MAX_WIDTH - OV5642_DEFAULT_WIDTH) / 2;
priv->crop_rect.top = (OV5642_MAX_HEIGHT - OV5642_DEFAULT_HEIGHT) / 2;
priv->crop_rect.width = OV5642_DEFAULT_WIDTH;
priv->crop_rect.height = OV5642_DEFAULT_HEIGHT;
priv->total_width = OV5642_DEFAULT_WIDTH + BLANKING_EXTRA_WIDTH;
priv->total_height = BLANKING_MIN_HEIGHT;
ret = ov5642_video_probe(client);
if (ret < 0)
goto error;