1 files changed, 339 insertions, 0 deletions

diff --git a/drivers/media/platform/omap/omap_voutlib.c b/drivers/media/platform/omap/omap_voutlib.c
new file mode 100644
index 000000000000..115408b9274f
--- /dev/null
+++ b/drivers/media/platform/omap/omap_voutlib.c
@@ -0,0 +1,339 @@
+/*
+ * omap_voutlib.c
+ *
+ * Copyright (C) 2005-2010 Texas Instruments.
+ *
+ * This file is licensed under the terms of the GNU General Public License
+ * version 2. This program is licensed "as is" without any warranty of any
+ * kind, whether express or implied.
+ *
+ * Based on the OMAP2 camera driver
+ * Video-for-Linux (Version 2) camera capture driver for
+ * the OMAP24xx camera controller.
+ *
+ * Author: Andy Lowe (source@mvista.com)
+ *
+ * Copyright (C) 2004 MontaVista Software, Inc.
+ * Copyright (C) 2010 Texas Instruments.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/videodev2.h>
+
+#include <linux/dma-mapping.h>
+
+#include <plat/cpu.h>
+
+#include "omap_voutlib.h"
+
+MODULE_AUTHOR("Texas Instruments");
+MODULE_DESCRIPTION("OMAP Video library");
+MODULE_LICENSE("GPL");
+
+/* Return the default overlay cropping rectangle in crop given the image
+ * size in pix and the video display size in fbuf.  The default
+ * cropping rectangle is the largest rectangle no larger than the capture size
+ * that will fit on the display.  The default cropping rectangle is centered in
+ * the image.  All dimensions and offsets are rounded down to even numbers.
+ */
+void omap_vout_default_crop(struct v4l2_pix_format *pix,
+                  struct v4l2_framebuffer *fbuf, struct v4l2_rect *crop)
+{
+        crop->width = (pix->width < fbuf->fmt.width) ?
+                pix->width : fbuf->fmt.width;
+        crop->height = (pix->height < fbuf->fmt.height) ?
+                pix->height : fbuf->fmt.height;
+        crop->width &= ~1;
+        crop->height &= ~1;
+        crop->left = ((pix->width - crop->width) >> 1) & ~1;
+        crop->top = ((pix->height - crop->height) >> 1) & ~1;
+}
+EXPORT_SYMBOL_GPL(omap_vout_default_crop);
+
+/* Given a new render window in new_win, adjust the window to the
+ * nearest supported configuration.  The adjusted window parameters are
+ * returned in new_win.
+ * Returns zero if successful, or -EINVAL if the requested window is
+ * impossible and cannot reasonably be adjusted.
+ */
+int omap_vout_try_window(struct v4l2_framebuffer *fbuf,
+                        struct v4l2_window *new_win)
+{
+        struct v4l2_rect try_win;
+
+        /* make a working copy of the new_win rectangle */
+        try_win = new_win->w;
+
+        /* adjust the preview window so it fits on the display by clipping any
+         * offscreen areas
+         */
+        if (try_win.left < 0) {
+                try_win.width += try_win.left;
+                try_win.left = 0;
+        }
+        if (try_win.top < 0) {
+                try_win.height += try_win.top;
+                try_win.top = 0;
+        }
+        try_win.width = (try_win.width < fbuf->fmt.width) ?
+                try_win.width : fbuf->fmt.width;
+        try_win.height = (try_win.height < fbuf->fmt.height) ?
+                try_win.height : fbuf->fmt.height;
+        if (try_win.left + try_win.width > fbuf->fmt.width)
+                try_win.width = fbuf->fmt.width - try_win.left;
+        if (try_win.top + try_win.height > fbuf->fmt.height)
+                try_win.height = fbuf->fmt.height - try_win.top;
+        try_win.width &= ~1;
+        try_win.height &= ~1;
+
+        if (try_win.width <= 0 || try_win.height <= 0)
+                return -EINVAL;
+
+        /* We now have a valid preview window, so go with it */
+        new_win->w = try_win;
+        new_win->field = V4L2_FIELD_ANY;
+        return 0;
+}
+EXPORT_SYMBOL_GPL(omap_vout_try_window);
+
+/* Given a new render window in new_win, adjust the window to the
+ * nearest supported configuration.  The image cropping window in crop
+ * will also be adjusted if necessary.  Preference is given to keeping the
+ * the window as close to the requested configuration as possible.  If
+ * successful, new_win, vout->win, and crop are updated.
+ * Returns zero if successful, or -EINVAL if the requested preview window is
+ * impossible and cannot reasonably be adjusted.
+ */
+int omap_vout_new_window(struct v4l2_rect *crop,
+                struct v4l2_window *win, struct v4l2_framebuffer *fbuf,
+                struct v4l2_window *new_win)
+{
+        int err;
+
+        err = omap_vout_try_window(fbuf, new_win);
+        if (err)
+                return err;
+
+        /* update our preview window */
+        win->w = new_win->w;
+        win->field = new_win->field;
+        win->chromakey = new_win->chromakey;
+
+        /* Adjust the cropping window to allow for resizing limitation */
+        if (cpu_is_omap24xx()) {
+                /* For 24xx limit is 8x to 1/2x scaling. */
+                if ((crop->height/win->w.height) >= 2)
+                        crop->height = win->w.height * 2;
+
+                if ((crop->width/win->w.width) >= 2)
+                        crop->width = win->w.width * 2;
+
+                if (crop->width > 768) {
+                        /* The OMAP2420 vertical resizing line buffer is 768
+                         * pixels wide. If the cropped image is wider than
+                         * 768 pixels then it cannot be vertically resized.
+                         */
+                        if (crop->height != win->w.height)
+                                crop->width = 768;
+                }
+        } else if (cpu_is_omap34xx()) {
+                /* For 34xx limit is 8x to 1/4x scaling. */
+                if ((crop->height/win->w.height) >= 4)
+                        crop->height = win->w.height * 4;
+
+                if ((crop->width/win->w.width) >= 4)
+                        crop->width = win->w.width * 4;
+        }
+        return 0;
+}
+EXPORT_SYMBOL_GPL(omap_vout_new_window);
+
+/* Given a new cropping rectangle in new_crop, adjust the cropping rectangle to
+ * the nearest supported configuration.  The image render window in win will
+ * also be adjusted if necessary.  The preview window is adjusted such that the
+ * horizontal and vertical rescaling ratios stay constant.  If the render
+ * window would fall outside the display boundaries, the cropping rectangle
+ * will also be adjusted to maintain the rescaling ratios.  If successful, crop
+ * and win are updated.
+ * Returns zero if successful, or -EINVAL if the requested cropping rectangle is
+ * impossible and cannot reasonably be adjusted.
+ */
+int omap_vout_new_crop(struct v4l2_pix_format *pix,
+              struct v4l2_rect *crop, struct v4l2_window *win,
+              struct v4l2_framebuffer *fbuf, const struct v4l2_rect *new_crop)
+{
+        struct v4l2_rect try_crop;
+        unsigned long vresize, hresize;
+
+        /* make a working copy of the new_crop rectangle */
+        try_crop = *new_crop;
+
+        /* adjust the cropping rectangle so it fits in the image */
+        if (try_crop.left < 0) {
+                try_crop.width += try_crop.left;
+                try_crop.left = 0;
+        }
+        if (try_crop.top < 0) {
+                try_crop.height += try_crop.top;
+                try_crop.top = 0;
+        }
+        try_crop.width = (try_crop.width < pix->width) ?
+                try_crop.width : pix->width;
+        try_crop.height = (try_crop.height < pix->height) ?
+                try_crop.height : pix->height;
+        if (try_crop.left + try_crop.width > pix->width)
+                try_crop.width = pix->width - try_crop.left;
+        if (try_crop.top + try_crop.height > pix->height)
+                try_crop.height = pix->height - try_crop.top;
+
+        try_crop.width &= ~1;
+        try_crop.height &= ~1;
+
+        if (try_crop.width <= 0 || try_crop.height <= 0)
+                return -EINVAL;
+
+        if (cpu_is_omap24xx()) {
+                if (try_crop.height != win->w.height) {
+                        /* If we're resizing vertically, we can't support a
+                         * crop width wider than 768 pixels.
+                         */
+                        if (try_crop.width > 768)
+                                try_crop.width = 768;
+                }
+        }
+        /* vertical resizing */
+        vresize = (1024 * try_crop.height) / win->w.height;
+        if (cpu_is_omap24xx() && (vresize > 2048))
+                vresize = 2048;
+        else if (cpu_is_omap34xx() && (vresize > 4096))
+                vresize = 4096;
+
+        win->w.height = ((1024 * try_crop.height) / vresize) & ~1;
+        if (win->w.height == 0)
+                win->w.height = 2;
+        if (win->w.height + win->w.top > fbuf->fmt.height) {
+                /* We made the preview window extend below the bottom of the
+                 * display, so clip it to the display boundary and resize the
+                 * cropping height to maintain the vertical resizing ratio.
+                 */
+                win->w.height = (fbuf->fmt.height - win->w.top) & ~1;
+                if (try_crop.height == 0)
+                        try_crop.height = 2;
+        }
+        /* horizontal resizing */
+        hresize = (1024 * try_crop.width) / win->w.width;
+        if (cpu_is_omap24xx() && (hresize > 2048))
+                hresize = 2048;
+        else if (cpu_is_omap34xx() && (hresize > 4096))
+                hresize = 4096;
+
+        win->w.width = ((1024 * try_crop.width) / hresize) & ~1;
+        if (win->w.width == 0)
+                win->w.width = 2;
+        if (win->w.width + win->w.left > fbuf->fmt.width) {
+                /* We made the preview window extend past the right side of the
+                 * display, so clip it to the display boundary and resize the
+                 * cropping width to maintain the horizontal resizing ratio.
+                 */
+                win->w.width = (fbuf->fmt.width - win->w.left) & ~1;
+                if (try_crop.width == 0)
+                        try_crop.width = 2;
+        }
+        if (cpu_is_omap24xx()) {
+                if ((try_crop.height/win->w.height) >= 2)
+                        try_crop.height = win->w.height * 2;
+
+                if ((try_crop.width/win->w.width) >= 2)
+                        try_crop.width = win->w.width * 2;
+
+                if (try_crop.width > 768) {
+                        /* The OMAP2420 vertical resizing line buffer is
+                         * 768 pixels wide.  If the cropped image is wider
+                         * than 768 pixels then it cannot be vertically resized.
+                         */
+                        if (try_crop.height != win->w.height)
+                                try_crop.width = 768;
+                }
+        } else if (cpu_is_omap34xx()) {
+                if ((try_crop.height/win->w.height) >= 4)
+                        try_crop.height = win->w.height * 4;
+
+                if ((try_crop.width/win->w.width) >= 4)
+                        try_crop.width = win->w.width * 4;
+        }
+        /* update our cropping rectangle and we're done */
+        *crop = try_crop;
+        return 0;
+}
+EXPORT_SYMBOL_GPL(omap_vout_new_crop);
+
+/* Given a new format in pix and fbuf,  crop and win
+ * structures are initialized to default values. crop
+ * is initialized to the largest window size that will fit on the display.  The
+ * crop window is centered in the image. win is initialized to
+ * the same size as crop and is centered on the display.
+ * All sizes and offsets are constrained to be even numbers.
+ */
+void omap_vout_new_format(struct v4l2_pix_format *pix,
+                struct v4l2_framebuffer *fbuf, struct v4l2_rect *crop,
+                struct v4l2_window *win)
+{
+        /* crop defines the preview source window in the image capture
+         * buffer
+         */
+        omap_vout_default_crop(pix, fbuf, crop);
+
+        /* win defines the preview target window on the display */
+        win->w.width = crop->width;
+        win->w.height = crop->height;
+        win->w.left = ((fbuf->fmt.width - win->w.width) >> 1) & ~1;
+        win->w.top = ((fbuf->fmt.height - win->w.height) >> 1) & ~1;
+}
+EXPORT_SYMBOL_GPL(omap_vout_new_format);
+
+/*
+ * Allocate buffers
+ */
+unsigned long omap_vout_alloc_buffer(u32 buf_size, u32 *phys_addr)
+{
+        u32 order, size;
+        unsigned long virt_addr, addr;
+
+        size = PAGE_ALIGN(buf_size);
+        order = get_order(size);
+        virt_addr = __get_free_pages(GFP_KERNEL, order);
+        addr = virt_addr;
+
+        if (virt_addr) {
+                while (size > 0) {
+                        SetPageReserved(virt_to_page(addr));
+                        addr += PAGE_SIZE;
+                        size -= PAGE_SIZE;
+                }
+        }
+        *phys_addr = (u32) virt_to_phys((void *) virt_addr);
+        return virt_addr;
+}
+
+/*
+ * Free buffers
+ */
+void omap_vout_free_buffer(unsigned long virtaddr, u32 buf_size)
+{
+        u32 order, size;
+        unsigned long addr = virtaddr;
+
+        size = PAGE_ALIGN(buf_size);
+        order = get_order(size);
+
+        while (size > 0) {
+                ClearPageReserved(virt_to_page(addr));
+                addr += PAGE_SIZE;
+                size -= PAGE_SIZE;
+        }
+        free_pages((unsigned long) virtaddr, order);
+}