+++ /dev/null
-/*
- * soc-camera generic scaling-cropping manipulation functions
- *
- * Copyright (C) 2013 Guennadi Liakhovetski <g.liakhovetski@gmx.de>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- */
-
-#include <linux/device.h>
-#include <linux/module.h>
-
-#include <media/soc_camera.h>
-#include <media/v4l2-common.h>
-
-#include "soc_scale_crop.h"
-
-#ifdef DEBUG_GEOMETRY
-#define dev_geo dev_info
-#else
-#define dev_geo dev_dbg
-#endif
-
-/* Check if any dimension of r1 is smaller than respective one of r2 */
-static bool is_smaller(const struct v4l2_rect *r1, const struct v4l2_rect *r2)
-{
- return r1->width < r2->width || r1->height < r2->height;
-}
-
-/* Check if r1 fails to cover r2 */
-static bool is_inside(const struct v4l2_rect *r1, const struct v4l2_rect *r2)
-{
- return r1->left > r2->left || r1->top > r2->top ||
- r1->left + r1->width < r2->left + r2->width ||
- r1->top + r1->height < r2->top + r2->height;
-}
-
-/* Get and store current client crop */
-int soc_camera_client_g_rect(struct v4l2_subdev *sd, struct v4l2_rect *rect)
-{
- struct v4l2_subdev_selection sdsel = {
- .which = V4L2_SUBDEV_FORMAT_ACTIVE,
- .target = V4L2_SEL_TGT_CROP,
- };
- int ret;
-
- ret = v4l2_subdev_call(sd, pad, get_selection, NULL, &sdsel);
- if (!ret) {
- *rect = sdsel.r;
- return ret;
- }
-
- sdsel.target = V4L2_SEL_TGT_CROP_BOUNDS;
- ret = v4l2_subdev_call(sd, pad, get_selection, NULL, &sdsel);
- if (!ret)
- *rect = sdsel.r;
-
- return ret;
-}
-EXPORT_SYMBOL(soc_camera_client_g_rect);
-
-/* Client crop has changed, update our sub-rectangle to remain within the area */
-static void move_and_crop_subrect(struct v4l2_rect *rect,
- struct v4l2_rect *subrect)
-{
- if (rect->width < subrect->width)
- subrect->width = rect->width;
-
- if (rect->height < subrect->height)
- subrect->height = rect->height;
-
- if (rect->left > subrect->left)
- subrect->left = rect->left;
- else if (rect->left + rect->width <
- subrect->left + subrect->width)
- subrect->left = rect->left + rect->width -
- subrect->width;
-
- if (rect->top > subrect->top)
- subrect->top = rect->top;
- else if (rect->top + rect->height <
- subrect->top + subrect->height)
- subrect->top = rect->top + rect->height -
- subrect->height;
-}
-
-/*
- * The common for both scaling and cropping iterative approach is:
- * 1. try if the client can produce exactly what requested by the user
- * 2. if (1) failed, try to double the client image until we get one big enough
- * 3. if (2) failed, try to request the maximum image
- */
-int soc_camera_client_s_selection(struct v4l2_subdev *sd,
- struct v4l2_selection *sel, struct v4l2_selection *cam_sel,
- struct v4l2_rect *target_rect, struct v4l2_rect *subrect)
-{
- struct v4l2_subdev_selection sdsel = {
- .which = V4L2_SUBDEV_FORMAT_ACTIVE,
- .target = sel->target,
- .flags = sel->flags,
- .r = sel->r,
- };
- struct v4l2_subdev_selection bounds = {
- .which = V4L2_SUBDEV_FORMAT_ACTIVE,
- .target = V4L2_SEL_TGT_CROP_BOUNDS,
- };
- struct v4l2_rect *rect = &sel->r, *cam_rect = &cam_sel->r;
- struct device *dev = sd->v4l2_dev->dev;
- int ret;
- unsigned int width, height;
-
- v4l2_subdev_call(sd, pad, set_selection, NULL, &sdsel);
- sel->r = sdsel.r;
- ret = soc_camera_client_g_rect(sd, cam_rect);
- if (ret < 0)
- return ret;
-
- /*
- * Now cam_crop contains the current camera input rectangle, and it must
- * be within camera cropcap bounds
- */
- if (!memcmp(rect, cam_rect, sizeof(*rect))) {
- /* Even if camera S_SELECTION failed, but camera rectangle matches */
- dev_dbg(dev, "Camera S_SELECTION successful for %dx%d@%d:%d\n",
- rect->width, rect->height, rect->left, rect->top);
- *target_rect = *cam_rect;
- return 0;
- }
-
- /* Try to fix cropping, that camera hasn't managed to set */
- dev_geo(dev, "Fix camera S_SELECTION for %dx%d@%d:%d to %dx%d@%d:%d\n",
- cam_rect->width, cam_rect->height,
- cam_rect->left, cam_rect->top,
- rect->width, rect->height, rect->left, rect->top);
-
- /* We need sensor maximum rectangle */
- ret = v4l2_subdev_call(sd, pad, get_selection, NULL, &bounds);
- if (ret < 0)
- return ret;
-
- /* Put user requested rectangle within sensor bounds */
- soc_camera_limit_side(&rect->left, &rect->width, sdsel.r.left, 2,
- bounds.r.width);
- soc_camera_limit_side(&rect->top, &rect->height, sdsel.r.top, 4,
- bounds.r.height);
-
- /*
- * Popular special case - some cameras can only handle fixed sizes like
- * QVGA, VGA,... Take care to avoid infinite loop.
- */
- width = max_t(unsigned int, cam_rect->width, 2);
- height = max_t(unsigned int, cam_rect->height, 2);
-
- /*
- * Loop as long as sensor is not covering the requested rectangle and
- * is still within its bounds
- */
- while (!ret && (is_smaller(cam_rect, rect) ||
- is_inside(cam_rect, rect)) &&
- (bounds.r.width > width || bounds.r.height > height)) {
-
- width *= 2;
- height *= 2;
-
- cam_rect->width = width;
- cam_rect->height = height;
-
- /*
- * We do not know what capabilities the camera has to set up
- * left and top borders. We could try to be smarter in iterating
- * them, e.g., if camera current left is to the right of the
- * target left, set it to the middle point between the current
- * left and minimum left. But that would add too much
- * complexity: we would have to iterate each border separately.
- * Instead we just drop to the left and top bounds.
- */
- if (cam_rect->left > rect->left)
- cam_rect->left = bounds.r.left;
-
- if (cam_rect->left + cam_rect->width < rect->left + rect->width)
- cam_rect->width = rect->left + rect->width -
- cam_rect->left;
-
- if (cam_rect->top > rect->top)
- cam_rect->top = bounds.r.top;
-
- if (cam_rect->top + cam_rect->height < rect->top + rect->height)
- cam_rect->height = rect->top + rect->height -
- cam_rect->top;
-
- sdsel.r = *cam_rect;
- v4l2_subdev_call(sd, pad, set_selection, NULL, &sdsel);
- *cam_rect = sdsel.r;
- ret = soc_camera_client_g_rect(sd, cam_rect);
- dev_geo(dev, "Camera S_SELECTION %d for %dx%d@%d:%d\n", ret,
- cam_rect->width, cam_rect->height,
- cam_rect->left, cam_rect->top);
- }
-
- /* S_SELECTION must not modify the rectangle */
- if (is_smaller(cam_rect, rect) || is_inside(cam_rect, rect)) {
- /*
- * The camera failed to configure a suitable cropping,
- * we cannot use the current rectangle, set to max
- */
- sdsel.r = bounds.r;
- v4l2_subdev_call(sd, pad, set_selection, NULL, &sdsel);
- *cam_rect = sdsel.r;
-
- ret = soc_camera_client_g_rect(sd, cam_rect);
- dev_geo(dev, "Camera S_SELECTION %d for max %dx%d@%d:%d\n", ret,
- cam_rect->width, cam_rect->height,
- cam_rect->left, cam_rect->top);
- }
-
- if (!ret) {
- *target_rect = *cam_rect;
- move_and_crop_subrect(target_rect, subrect);
- }
-
- return ret;
-}
-EXPORT_SYMBOL(soc_camera_client_s_selection);
-
-/* Iterative set_fmt, also updates cached client crop on success */
-static int client_set_fmt(struct soc_camera_device *icd,
- struct v4l2_rect *rect, struct v4l2_rect *subrect,
- unsigned int max_width, unsigned int max_height,
- struct v4l2_subdev_format *format, bool host_can_scale)
-{
- struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
- struct device *dev = icd->parent;
- struct v4l2_mbus_framefmt *mf = &format->format;
- unsigned int width = mf->width, height = mf->height, tmp_w, tmp_h;
- struct v4l2_subdev_selection sdsel = {
- .which = V4L2_SUBDEV_FORMAT_ACTIVE,
- .target = V4L2_SEL_TGT_CROP_BOUNDS,
- };
- bool host_1to1;
- int ret;
-
- ret = v4l2_device_call_until_err(sd->v4l2_dev,
- soc_camera_grp_id(icd), pad,
- set_fmt, NULL, format);
- if (ret < 0)
- return ret;
-
- dev_geo(dev, "camera scaled to %ux%u\n", mf->width, mf->height);
-
- if (width == mf->width && height == mf->height) {
- /* Perfect! The client has done it all. */
- host_1to1 = true;
- goto update_cache;
- }
-
- host_1to1 = false;
- if (!host_can_scale)
- goto update_cache;
-
- ret = v4l2_subdev_call(sd, pad, get_selection, NULL, &sdsel);
- if (ret < 0)
- return ret;
-
- if (max_width > sdsel.r.width)
- max_width = sdsel.r.width;
- if (max_height > sdsel.r.height)
- max_height = sdsel.r.height;
-
- /* Camera set a format, but geometry is not precise, try to improve */
- tmp_w = mf->width;
- tmp_h = mf->height;
-
- /* width <= max_width && height <= max_height - guaranteed by try_fmt */
- while ((width > tmp_w || height > tmp_h) &&
- tmp_w < max_width && tmp_h < max_height) {
- tmp_w = min(2 * tmp_w, max_width);
- tmp_h = min(2 * tmp_h, max_height);
- mf->width = tmp_w;
- mf->height = tmp_h;
- ret = v4l2_device_call_until_err(sd->v4l2_dev,
- soc_camera_grp_id(icd), pad,
- set_fmt, NULL, format);
- dev_geo(dev, "Camera scaled to %ux%u\n",
- mf->width, mf->height);
- if (ret < 0) {
- /* This shouldn't happen */
- dev_err(dev, "Client failed to set format: %d\n", ret);
- return ret;
- }
- }
-
-update_cache:
- /* Update cache */
- ret = soc_camera_client_g_rect(sd, rect);
- if (ret < 0)
- return ret;
-
- if (host_1to1)
- *subrect = *rect;
- else
- move_and_crop_subrect(rect, subrect);
-
- return 0;
-}
-
-/**
- * soc_camera_client_scale
- * @icd: soc-camera device
- * @rect: camera cropping window
- * @subrect: part of rect, sent to the user
- * @mf: in- / output camera output window
- * @width: on input: max host input width;
- * on output: user width, mapped back to input
- * @height: on input: max host input height;
- * on output: user height, mapped back to input
- * @host_can_scale: host can scale this pixel format
- * @shift: shift, used for scaling
- */
-int soc_camera_client_scale(struct soc_camera_device *icd,
- struct v4l2_rect *rect, struct v4l2_rect *subrect,
- struct v4l2_mbus_framefmt *mf,
- unsigned int *width, unsigned int *height,
- bool host_can_scale, unsigned int shift)
-{
- struct device *dev = icd->parent;
- struct v4l2_subdev_format fmt_tmp = {
- .which = V4L2_SUBDEV_FORMAT_ACTIVE,
- .format = *mf,
- };
- struct v4l2_mbus_framefmt *mf_tmp = &fmt_tmp.format;
- unsigned int scale_h, scale_v;
- int ret;
-
- /*
- * 5. Apply iterative camera S_FMT for camera user window (also updates
- * client crop cache and the imaginary sub-rectangle).
- */
- ret = client_set_fmt(icd, rect, subrect, *width, *height,
- &fmt_tmp, host_can_scale);
- if (ret < 0)
- return ret;
-
- dev_geo(dev, "5: camera scaled to %ux%u\n",
- mf_tmp->width, mf_tmp->height);
-
- /* 6. Retrieve camera output window (g_fmt) */
-
- /* unneeded - it is already in "mf_tmp" */
-
- /* 7. Calculate new client scales. */
- scale_h = soc_camera_calc_scale(rect->width, shift, mf_tmp->width);
- scale_v = soc_camera_calc_scale(rect->height, shift, mf_tmp->height);
-
- mf->width = mf_tmp->width;
- mf->height = mf_tmp->height;
- mf->colorspace = mf_tmp->colorspace;
-
- /*
- * 8. Calculate new host crop - apply camera scales to previously
- * updated "effective" crop.
- */
- *width = soc_camera_shift_scale(subrect->width, shift, scale_h);
- *height = soc_camera_shift_scale(subrect->height, shift, scale_v);
-
- dev_geo(dev, "8: new client sub-window %ux%u\n", *width, *height);
-
- return 0;
-}
-EXPORT_SYMBOL(soc_camera_client_scale);
-
-/*
- * Calculate real client output window by applying new scales to the current
- * client crop. New scales are calculated from the requested output format and
- * host crop, mapped backed onto the client input (subrect).
- */
-void soc_camera_calc_client_output(struct soc_camera_device *icd,
- struct v4l2_rect *rect, struct v4l2_rect *subrect,
- const struct v4l2_pix_format *pix, struct v4l2_mbus_framefmt *mf,
- unsigned int shift)
-{
- struct device *dev = icd->parent;
- unsigned int scale_v, scale_h;
-
- if (subrect->width == rect->width &&
- subrect->height == rect->height) {
- /* No sub-cropping */
- mf->width = pix->width;
- mf->height = pix->height;
- return;
- }
-
- /* 1.-2. Current camera scales and subwin - cached. */
-
- dev_geo(dev, "2: subwin %ux%u@%u:%u\n",
- subrect->width, subrect->height,
- subrect->left, subrect->top);
-
- /*
- * 3. Calculate new combined scales from input sub-window to requested
- * user window.
- */
-
- /*
- * TODO: CEU cannot scale images larger than VGA to smaller than SubQCIF
- * (128x96) or larger than VGA. This and similar limitations have to be
- * taken into account here.
- */
- scale_h = soc_camera_calc_scale(subrect->width, shift, pix->width);
- scale_v = soc_camera_calc_scale(subrect->height, shift, pix->height);
-
- dev_geo(dev, "3: scales %u:%u\n", scale_h, scale_v);
-
- /*
- * 4. Calculate desired client output window by applying combined scales
- * to client (real) input window.
- */
- mf->width = soc_camera_shift_scale(rect->width, shift, scale_h);
- mf->height = soc_camera_shift_scale(rect->height, shift, scale_v);
-}
-EXPORT_SYMBOL(soc_camera_calc_client_output);
-
-MODULE_DESCRIPTION("soc-camera scaling-cropping functions");
-MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>");
-MODULE_LICENSE("GPL");
projects / platform / kernel / linux-rpi.git / commitdiff