/*
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* omap_voutlib.c
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*
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* Copyright (C) 2005-2010 Texas Instruments.
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*
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* This file is licensed under the terms of the GNU General Public License
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* version 2. This program is licensed "as is" without any warranty of any
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* kind, whether express or implied.
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*
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* Based on the OMAP2 camera driver
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* Video-for-Linux (Version 2) camera capture driver for
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* the OMAP24xx camera controller.
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*
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* Author: Andy Lowe (source@mvista.com)
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*
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* Copyright (C) 2004 MontaVista Software, Inc.
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* Copyright (C) 2010 Texas Instruments.
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*
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*/
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/videodev2.h>
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#include <linux/dma-mapping.h>
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#include <video/omapfb_dss.h>
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#include "omap_voutlib.h"
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MODULE_AUTHOR("Texas Instruments");
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MODULE_DESCRIPTION("OMAP Video library");
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MODULE_LICENSE("GPL");
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/* Return the default overlay cropping rectangle in crop given the image
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* size in pix and the video display size in fbuf. The default
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* cropping rectangle is the largest rectangle no larger than the capture size
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* that will fit on the display. The default cropping rectangle is centered in
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* the image. All dimensions and offsets are rounded down to even numbers.
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*/
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void omap_vout_default_crop(struct v4l2_pix_format *pix,
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struct v4l2_framebuffer *fbuf, struct v4l2_rect *crop)
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{
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crop->width = (pix->width < fbuf->fmt.width) ?
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pix->width : fbuf->fmt.width;
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crop->height = (pix->height < fbuf->fmt.height) ?
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pix->height : fbuf->fmt.height;
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crop->width &= ~1;
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crop->height &= ~1;
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crop->left = ((pix->width - crop->width) >> 1) & ~1;
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crop->top = ((pix->height - crop->height) >> 1) & ~1;
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}
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EXPORT_SYMBOL_GPL(omap_vout_default_crop);
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/* Given a new render window in new_win, adjust the window to the
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* nearest supported configuration. The adjusted window parameters are
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* returned in new_win.
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* Returns zero if successful, or -EINVAL if the requested window is
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* impossible and cannot reasonably be adjusted.
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*/
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int omap_vout_try_window(struct v4l2_framebuffer *fbuf,
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struct v4l2_window *new_win)
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{
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struct v4l2_rect try_win;
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/* make a working copy of the new_win rectangle */
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try_win = new_win->w;
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/* adjust the preview window so it fits on the display by clipping any
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* offscreen areas
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*/
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if (try_win.left < 0) {
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try_win.width += try_win.left;
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try_win.left = 0;
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}
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if (try_win.top < 0) {
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try_win.height += try_win.top;
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try_win.top = 0;
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}
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try_win.width = (try_win.width < fbuf->fmt.width) ?
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try_win.width : fbuf->fmt.width;
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try_win.height = (try_win.height < fbuf->fmt.height) ?
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try_win.height : fbuf->fmt.height;
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if (try_win.left + try_win.width > fbuf->fmt.width)
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try_win.width = fbuf->fmt.width - try_win.left;
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if (try_win.top + try_win.height > fbuf->fmt.height)
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try_win.height = fbuf->fmt.height - try_win.top;
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try_win.width &= ~1;
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try_win.height &= ~1;
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if (try_win.width <= 0 || try_win.height <= 0)
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return -EINVAL;
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/* We now have a valid preview window, so go with it */
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new_win->w = try_win;
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new_win->field = V4L2_FIELD_NONE;
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new_win->clips = NULL;
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new_win->clipcount = 0;
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new_win->bitmap = NULL;
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return 0;
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}
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EXPORT_SYMBOL_GPL(omap_vout_try_window);
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/* Given a new render window in new_win, adjust the window to the
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* nearest supported configuration. The image cropping window in crop
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* will also be adjusted if necessary. Preference is given to keeping the
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* the window as close to the requested configuration as possible. If
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* successful, new_win, vout->win, and crop are updated.
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* Returns zero if successful, or -EINVAL if the requested preview window is
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* impossible and cannot reasonably be adjusted.
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*/
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int omap_vout_new_window(struct v4l2_rect *crop,
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struct v4l2_window *win, struct v4l2_framebuffer *fbuf,
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struct v4l2_window *new_win)
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{
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int err;
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err = omap_vout_try_window(fbuf, new_win);
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if (err)
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return err;
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/* update our preview window */
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win->w = new_win->w;
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win->field = new_win->field;
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win->chromakey = new_win->chromakey;
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/* Adjust the cropping window to allow for resizing limitation */
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if (omap_vout_dss_omap24xx()) {
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/* For 24xx limit is 8x to 1/2x scaling. */
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if ((crop->height/win->w.height) >= 2)
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crop->height = win->w.height * 2;
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if ((crop->width/win->w.width) >= 2)
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crop->width = win->w.width * 2;
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if (crop->width > 768) {
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/* The OMAP2420 vertical resizing line buffer is 768
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* pixels wide. If the cropped image is wider than
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* 768 pixels then it cannot be vertically resized.
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*/
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if (crop->height != win->w.height)
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crop->width = 768;
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}
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} else if (omap_vout_dss_omap34xx()) {
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/* For 34xx limit is 8x to 1/4x scaling. */
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if ((crop->height/win->w.height) >= 4)
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crop->height = win->w.height * 4;
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if ((crop->width/win->w.width) >= 4)
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crop->width = win->w.width * 4;
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(omap_vout_new_window);
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/* Given a new cropping rectangle in new_crop, adjust the cropping rectangle to
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* the nearest supported configuration. The image render window in win will
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* also be adjusted if necessary. The preview window is adjusted such that the
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* horizontal and vertical rescaling ratios stay constant. If the render
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* window would fall outside the display boundaries, the cropping rectangle
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* will also be adjusted to maintain the rescaling ratios. If successful, crop
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* and win are updated.
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* Returns zero if successful, or -EINVAL if the requested cropping rectangle is
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* impossible and cannot reasonably be adjusted.
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*/
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int omap_vout_new_crop(struct v4l2_pix_format *pix,
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struct v4l2_rect *crop, struct v4l2_window *win,
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struct v4l2_framebuffer *fbuf, const struct v4l2_rect *new_crop)
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{
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struct v4l2_rect try_crop;
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unsigned long vresize, hresize;
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/* make a working copy of the new_crop rectangle */
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try_crop = *new_crop;
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/* adjust the cropping rectangle so it fits in the image */
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if (try_crop.left < 0) {
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try_crop.width += try_crop.left;
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try_crop.left = 0;
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}
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if (try_crop.top < 0) {
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try_crop.height += try_crop.top;
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try_crop.top = 0;
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}
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try_crop.width = (try_crop.width < pix->width) ?
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try_crop.width : pix->width;
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try_crop.height = (try_crop.height < pix->height) ?
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try_crop.height : pix->height;
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if (try_crop.left + try_crop.width > pix->width)
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try_crop.width = pix->width - try_crop.left;
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if (try_crop.top + try_crop.height > pix->height)
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try_crop.height = pix->height - try_crop.top;
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try_crop.width &= ~1;
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try_crop.height &= ~1;
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if (try_crop.width <= 0 || try_crop.height <= 0)
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return -EINVAL;
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if (omap_vout_dss_omap24xx()) {
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if (try_crop.height != win->w.height) {
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/* If we're resizing vertically, we can't support a
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* crop width wider than 768 pixels.
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*/
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if (try_crop.width > 768)
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try_crop.width = 768;
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}
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}
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/* vertical resizing */
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vresize = (1024 * try_crop.height) / win->w.height;
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if (omap_vout_dss_omap24xx() && (vresize > 2048))
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vresize = 2048;
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else if (omap_vout_dss_omap34xx() && (vresize > 4096))
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vresize = 4096;
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win->w.height = ((1024 * try_crop.height) / vresize) & ~1;
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if (win->w.height == 0)
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win->w.height = 2;
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if (win->w.height + win->w.top > fbuf->fmt.height) {
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/* We made the preview window extend below the bottom of the
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* display, so clip it to the display boundary and resize the
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* cropping height to maintain the vertical resizing ratio.
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*/
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win->w.height = (fbuf->fmt.height - win->w.top) & ~1;
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if (try_crop.height == 0)
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try_crop.height = 2;
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}
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/* horizontal resizing */
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hresize = (1024 * try_crop.width) / win->w.width;
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if (omap_vout_dss_omap24xx() && (hresize > 2048))
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hresize = 2048;
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else if (omap_vout_dss_omap34xx() && (hresize > 4096))
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hresize = 4096;
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win->w.width = ((1024 * try_crop.width) / hresize) & ~1;
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if (win->w.width == 0)
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win->w.width = 2;
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if (win->w.width + win->w.left > fbuf->fmt.width) {
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/* We made the preview window extend past the right side of the
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* display, so clip it to the display boundary and resize the
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* cropping width to maintain the horizontal resizing ratio.
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*/
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win->w.width = (fbuf->fmt.width - win->w.left) & ~1;
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if (try_crop.width == 0)
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try_crop.width = 2;
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}
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if (omap_vout_dss_omap24xx()) {
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if ((try_crop.height/win->w.height) >= 2)
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try_crop.height = win->w.height * 2;
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if ((try_crop.width/win->w.width) >= 2)
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try_crop.width = win->w.width * 2;
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if (try_crop.width > 768) {
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/* The OMAP2420 vertical resizing line buffer is
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* 768 pixels wide. If the cropped image is wider
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* than 768 pixels then it cannot be vertically resized.
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*/
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if (try_crop.height != win->w.height)
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try_crop.width = 768;
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}
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} else if (omap_vout_dss_omap34xx()) {
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if ((try_crop.height/win->w.height) >= 4)
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try_crop.height = win->w.height * 4;
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if ((try_crop.width/win->w.width) >= 4)
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try_crop.width = win->w.width * 4;
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}
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/* update our cropping rectangle and we're done */
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*crop = try_crop;
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return 0;
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}
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EXPORT_SYMBOL_GPL(omap_vout_new_crop);
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/* Given a new format in pix and fbuf, crop and win
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* structures are initialized to default values. crop
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* is initialized to the largest window size that will fit on the display. The
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* crop window is centered in the image. win is initialized to
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* the same size as crop and is centered on the display.
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* All sizes and offsets are constrained to be even numbers.
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*/
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void omap_vout_new_format(struct v4l2_pix_format *pix,
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struct v4l2_framebuffer *fbuf, struct v4l2_rect *crop,
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struct v4l2_window *win)
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{
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/* crop defines the preview source window in the image capture
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* buffer
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*/
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omap_vout_default_crop(pix, fbuf, crop);
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/* win defines the preview target window on the display */
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win->w.width = crop->width;
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win->w.height = crop->height;
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win->w.left = ((fbuf->fmt.width - win->w.width) >> 1) & ~1;
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win->w.top = ((fbuf->fmt.height - win->w.height) >> 1) & ~1;
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}
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EXPORT_SYMBOL_GPL(omap_vout_new_format);
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/*
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* Allocate buffers
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*/
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unsigned long omap_vout_alloc_buffer(u32 buf_size, u32 *phys_addr)
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{
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u32 order, size;
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unsigned long virt_addr, addr;
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size = PAGE_ALIGN(buf_size);
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order = get_order(size);
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virt_addr = __get_free_pages(GFP_KERNEL, order);
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addr = virt_addr;
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if (virt_addr) {
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while (size > 0) {
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SetPageReserved(virt_to_page(addr));
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addr += PAGE_SIZE;
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size -= PAGE_SIZE;
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}
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}
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*phys_addr = (u32) virt_to_phys((void *) virt_addr);
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return virt_addr;
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}
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/*
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* Free buffers
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*/
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void omap_vout_free_buffer(unsigned long virtaddr, u32 buf_size)
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{
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u32 order, size;
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unsigned long addr = virtaddr;
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size = PAGE_ALIGN(buf_size);
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order = get_order(size);
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while (size > 0) {
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ClearPageReserved(virt_to_page(addr));
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addr += PAGE_SIZE;
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size -= PAGE_SIZE;
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}
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free_pages((unsigned long) virtaddr, order);
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}
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bool omap_vout_dss_omap24xx(void)
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{
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return omapdss_get_version() == OMAPDSS_VER_OMAP24xx;
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}
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bool omap_vout_dss_omap34xx(void)
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{
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switch (omapdss_get_version()) {
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case OMAPDSS_VER_OMAP34xx_ES1:
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case OMAPDSS_VER_OMAP34xx_ES3:
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case OMAPDSS_VER_OMAP3630:
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case OMAPDSS_VER_AM35xx:
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return true;
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default:
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return false;
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}
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}
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