target/linux/omap/patches-3.12/0343-video-da8xx-fb-Add-API-to-register-wait-for-vsync-ca.patch

   1 From 9a1a810516ae9cb3259b898b6879901c5b44fa90 Mon Sep 17 00:00:00 2001
   2 From: Prathap M S <msprathap@ti.com>
   3 Date: Mon, 2 Sep 2013 12:05:23 +0530
   4 Subject: [PATCH 343/752] video: da8xx-fb: Add API to register wait for vsync
   5  callback
   6
   7 This patch adds APIs to register and unregister wait for vsync callback.
   8 This is derived from commit id 2d44302545da24fd22912d964102bc31a7489e97
   9 This commit id was part of 3.2 kernel sources.
  10
  11 Signed-off-by: Prathap M S <msprathap@ti.com>
  12 ---
  13  drivers/video/da8xx-fb.c |   33 +++++++++++++++++++++++++++++++++
  14  include/video/da8xx-fb.h |    4 ++++
  15  2 files changed, 37 insertions(+)
  16
  17 diff --git a/drivers/video/da8xx-fb.c b/drivers/video/da8xx-fb.c
  18 index c534d45..77dc477 100644
  19 --- a/drivers/video/da8xx-fb.c
  20 +++ b/drivers/video/da8xx-fb.c
  21 @@ -235,6 +235,9 @@ static struct fb_fix_screeninfo da8xx_fb_fix = {
  22         .accel = FB_ACCEL_NONE
  23  };
  24
  25 +static vsync_callback_t vsync_cb_handler;
  26 +static void *vsync_cb_arg;
  27 +
  28  static struct fb_videomode known_lcd_panels[] = {
  29         /* Sharp LCD035Q3DG01 */
  30         [0] = {
  31 @@ -916,6 +919,32 @@ static int lcd_init(struct da8xx_fb_par *par, const struct lcd_ctrl_config *cfg,
  32         return 0;
  33  }
  34
  35 +int register_vsync_cb(vsync_callback_t handler, void *arg, int idx)
  36 +{
  37 +       if ((vsync_cb_handler == NULL) && (vsync_cb_arg == NULL)) {
  38 +               vsync_cb_arg = arg;
  39 +               vsync_cb_handler = handler;
  40 +       } else {
  41 +               return -EEXIST;
  42 +       }
  43 +
  44 +       return 0;
  45 +}
  46 +EXPORT_SYMBOL(register_vsync_cb);
  47 +
  48 +int unregister_vsync_cb(vsync_callback_t handler, void *arg, int idx)
  49 +{
  50 +       if ((vsync_cb_handler == handler) && (vsync_cb_arg == arg)) {
  51 +               vsync_cb_handler = NULL;
  52 +               vsync_cb_arg = NULL;
  53 +       } else {
  54 +               return -ENXIO;
  55 +       }
  56 +
  57 +       return 0;
  58 +}
  59 +EXPORT_SYMBOL(unregister_vsync_cb);
  60 +
  61  /* IRQ handler for version 2 of LCDC */
  62  static irqreturn_t lcdc_irq_handler_rev02(int irq, void *arg)
  63  {
  64 @@ -953,6 +982,8 @@ static irqreturn_t lcdc_irq_handler_rev02(int irq, void *arg)
  65                                    LCD_DMA_FRM_BUF_CEILING_ADDR_0_REG);
  66                         par->vsync_flag = 1;
  67                         wake_up_interruptible(&par->vsync_wait);
  68 +                       if (vsync_cb_handler)
  69 +                               vsync_cb_handler(vsync_cb_arg);
  70                 }
  71
  72                 if (stat & LCD_END_OF_FRAME1) {
  73 @@ -1028,6 +1059,8 @@ static irqreturn_t lcdc_irq_handler_rev01(int irq, void *arg)
  74                                    LCD_DMA_FRM_BUF_CEILING_ADDR_1_REG);
  75                         par->vsync_flag = 1;
  76                         wake_up_interruptible(&par->vsync_wait);
  77 +                       if (vsync_cb_handler)
  78 +                               vsync_cb_handler(vsync_cb_arg);
  79                 }
  80         }
  81
  82 diff --git a/include/video/da8xx-fb.h b/include/video/da8xx-fb.h
  83 index 74c986a..2a0c739 100644
  84 --- a/include/video/da8xx-fb.h
  85 +++ b/include/video/da8xx-fb.h
  86 @@ -106,5 +106,9 @@ void da8xx_register_encoder(struct da8xx_encoder *encoder);
  87  void da8xx_unregister_encoder(struct da8xx_encoder *encoder);
  88
  89
  90 +typedef void (*vsync_callback_t)(void *arg);
  91 +int register_vsync_cb(vsync_callback_t handler, void *arg, int idx);
  92 +int unregister_vsync_cb(vsync_callback_t handler, void *arg, int idx);
  93 +
  94  #endif  /* ifndef DA8XX_FB_H */
  95
  96 --
  97 1.7.10.4
  98