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From 9a1a810516ae9cb3259b898b6879901c5b44fa90 Mon Sep 17 00:00:00 2001
From: Prathap M S <msprathap@ti.com>
Date: Mon, 2 Sep 2013 12:05:23 +0530
Subject: [PATCH 343/752] video: da8xx-fb: Add API to register wait for vsync
callback
This patch adds APIs to register and unregister wait for vsync callback.
This is derived from commit id 2d44302545da24fd22912d964102bc31a7489e97
This commit id was part of 3.2 kernel sources.
Signed-off-by: Prathap M S <msprathap@ti.com>
---
drivers/video/da8xx-fb.c | 33 +++++++++++++++++++++++++++++++++
include/video/da8xx-fb.h | 4 ++++
2 files changed, 37 insertions(+)
diff --git a/drivers/video/da8xx-fb.c b/drivers/video/da8xx-fb.c
index c534d45..77dc477 100644
--- a/drivers/video/da8xx-fb.c
+++ b/drivers/video/da8xx-fb.c
@@ -235,6 +235,9 @@ static struct fb_fix_screeninfo da8xx_fb_fix = {
.accel = FB_ACCEL_NONE
};
+static vsync_callback_t vsync_cb_handler;
+static void *vsync_cb_arg;
+
static struct fb_videomode known_lcd_panels[] = {
/* Sharp LCD035Q3DG01 */
[0] = {
@@ -916,6 +919,32 @@ static int lcd_init(struct da8xx_fb_par *par, const struct lcd_ctrl_config *cfg,
return 0;
}
+int register_vsync_cb(vsync_callback_t handler, void *arg, int idx)
+{
+ if ((vsync_cb_handler == NULL) && (vsync_cb_arg == NULL)) {
+ vsync_cb_arg = arg;
+ vsync_cb_handler = handler;
+ } else {
+ return -EEXIST;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(register_vsync_cb);
+
+int unregister_vsync_cb(vsync_callback_t handler, void *arg, int idx)
+{
+ if ((vsync_cb_handler == handler) && (vsync_cb_arg == arg)) {
+ vsync_cb_handler = NULL;
+ vsync_cb_arg = NULL;
+ } else {
+ return -ENXIO;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(unregister_vsync_cb);
+
/* IRQ handler for version 2 of LCDC */
static irqreturn_t lcdc_irq_handler_rev02(int irq, void *arg)
{
@@ -953,6 +982,8 @@ static irqreturn_t lcdc_irq_handler_rev02(int irq, void *arg)
LCD_DMA_FRM_BUF_CEILING_ADDR_0_REG);
par->vsync_flag = 1;
wake_up_interruptible(&par->vsync_wait);
+ if (vsync_cb_handler)
+ vsync_cb_handler(vsync_cb_arg);
}
if (stat & LCD_END_OF_FRAME1) {
@@ -1028,6 +1059,8 @@ static irqreturn_t lcdc_irq_handler_rev01(int irq, void *arg)
LCD_DMA_FRM_BUF_CEILING_ADDR_1_REG);
par->vsync_flag = 1;
wake_up_interruptible(&par->vsync_wait);
+ if (vsync_cb_handler)
+ vsync_cb_handler(vsync_cb_arg);
}
}
diff --git a/include/video/da8xx-fb.h b/include/video/da8xx-fb.h
index 74c986a..2a0c739 100644
--- a/include/video/da8xx-fb.h
+++ b/include/video/da8xx-fb.h
@@ -106,5 +106,9 @@ void da8xx_register_encoder(struct da8xx_encoder *encoder);
void da8xx_unregister_encoder(struct da8xx_encoder *encoder);
+typedef void (*vsync_callback_t)(void *arg);
+int register_vsync_cb(vsync_callback_t handler, void *arg, int idx);
+int unregister_vsync_cb(vsync_callback_t handler, void *arg, int idx);
+
#endif /* ifndef DA8XX_FB_H */
--
1.7.10.4
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