linux-kernel - [PATCH 4/4] DaVinci: vpfe: support for pm

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Date:	Thu, 12 May 2011 19:11:05 +0200
From:	Raffaele Recalcati <lamiaposta71@...il.com>
To:	linux-pm@...ts.linux-foundation.org
Cc:	davinci-linux-open-source@...ux.davincidsp.com,
	linux-kernel@...r.kernel.org,
	Raffaele Recalcati <raffaele.recalcati@...cino.it>
Subject: [PATCH 4/4] DaVinci: vpfe: support for pm_loss

From: Raffaele Recalcati <raffaele.recalcati@...cino.it>

Signed-off-by: Raffaele Recalcati <raffaele.recalcati@...cino.it>
---
 drivers/media/video/davinci/vpfe_capture.c |   45 ++++++++++++++++++++++++++++
 1 files changed, 45 insertions(+), 0 deletions(-)

diff --git a/drivers/media/video/davinci/vpfe_capture.c b/drivers/media/video/davinci/vpfe_capture.c
index 353eada..21fa9bf 100644
--- a/drivers/media/video/davinci/vpfe_capture.c
+++ b/drivers/media/video/davinci/vpfe_capture.c
@@ -74,6 +74,8 @@
 #include <media/v4l2-common.h>
 #include <linux/io.h>
 #include <media/davinci/vpfe_capture.h>
+#include <linux/pm.h>
+#include <linux/pm_loss.h>
 #include "ccdc_hw_device.h"
 
 static int debug;
@@ -2051,6 +2053,46 @@ static int __devexit vpfe_remove(struct platform_device *pdev)
 	return 0;
 }
 
+#ifdef CONFIG_PM_LOSS
+static int vpfe_capture_power_changed(struct device *dev,
+				      enum sys_power_state s)
+{
+	int ret;
+	struct vpfe_device *vpfe_dev = dev_get_drvdata(dev);
+	struct vpfe_subdev_info *sdinfo = vpfe_dev->current_subdev;
+
+	if (!sdinfo)
+		return -EINVAL;
+
+	if (!vpfe_dev->started) {
+		pr_debug_pm_loss("vpfe_capture_power_changed(%d) "
+				 "BUT NOTHING TO DO\n", s);
+		return 0;
+	}
+
+	sdinfo = vpfe_dev->current_subdev;
+
+	switch (s) {
+	case SYS_PWR_GOOD:
+		pr_debug_pm_loss("vpfe_capture_power_changed(%d)\n", s);
+		ret = v4l2_device_call_until_err(&vpfe_dev->v4l2_dev,
+						 sdinfo->grp_id,
+						 video, s_stream, 1);
+		break;
+	case SYS_PWR_FAILING:
+		pr_debug_pm_loss("vpfe_capture_power_changed(%d)\n", s);
+		ret = v4l2_device_call_until_err(&vpfe_dev->v4l2_dev,
+						 sdinfo->grp_id,
+						 video, s_stream, 0);
+		break;
+	default:
+		BUG();
+		ret = -ENODEV;
+	}
+	return ret;
+}
+#endif /* CONFIG_PM_LOSS */
+
 static int vpfe_suspend(struct device *dev)
 {
 	return 0;
@@ -2064,6 +2106,9 @@ static int vpfe_resume(struct device *dev)
 static const struct dev_pm_ops vpfe_dev_pm_ops = {
 	.suspend = vpfe_suspend,
 	.resume = vpfe_resume,
+#ifdef CONFIG_PM_LOSS
+	.power_changed = vpfe_capture_power_changed,
+#endif
 };
 
 static struct platform_driver vpfe_driver = {
-- 
1.7.0.4

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