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From 0f4e7d4b7d7314b38a9fd3497d7d4e0c36d19bff 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 3/3] 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(+), 0 deletions(-)
diff --git a/drivers/video/da8xx-fb.c b/drivers/video/da8xx-fb.c
index 131cf4c..ef06b85 100644
--- a/drivers/video/da8xx-fb.c
+++ b/drivers/video/da8xx-fb.c
@@ -199,6 +199,9 @@ 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] = {
@@ -806,6 +809,32 @@ 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)
{
@@ -843,6 +872,8 @@ 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) {
@@ -918,6 +949,8 @@ 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 efed3c3..a6cc484 100644
--- a/include/video/da8xx-fb.h
+++ b/include/video/da8xx-fb.h
@@ -91,5 +91,9 @@ struct lcd_sync_arg {
/* Proprietary FB_SYNC_ flags */
#define FB_SYNC_CLK_INVERT 0x40000000
+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 */
--
1.7.1
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