linux-kernel - [PATCH 3/3] hid-picolcd: make use of new suspend/resume hooks

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Date:	Wed, 24 Feb 2010 17:01:25 +0100
From:	Bruno Prémont <bonbons@...ux-vserver.org>
To:	Jiri Kosina <jkosina@...e.cz>
Cc:	linux-input@...r.kernel.org, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	"Rick L. Vinyard Jr." <rvinyard@...nmsu.edu>,
	Nicu Pavel <npavel@...ner.com>
Subject: [PATCH 3/3] hid-picolcd: make use of new suspend/resume hooks

Make use of new suspend/resume hooks to disable backlight on suspend
and restore backlight on simple resume or backlight, contrast and
framebuffer content on reset-resume.

Signed-off-by: Bruno Prémont <bonbons@...ux-vserver.org>
Cc: Nicu Pavel <npavel@...ner.com>
---
 drivers/hid/hid-picolcd.c           |   45 +++
 1 files changed, 45 insertions(+), 0 deletions(-)

diff --git a/drivers/hid/hid-picolcd.c b/drivers/hid/hid-picolcd.c
index e69de29..90f6be5 100644
--- a/drivers/hid/hid-picolcd.c
+++ b/drivers/hid/hid-picolcd.c
@@ -833,6 +833,46 @@
 };
 
 
+#ifdef CONFIG_PM
+static int picolcd_suspend(struct hid_device *hdev)
+{
+	struct picolcd_data *data = hid_get_drvdata(hdev);
+	int bl_power = data->lcd_power;
+
+	data->backlight->props.power = FB_BLANK_POWERDOWN;
+	picolcd_set_brightness(data->backlight);
+	data->lcd_power = data->backlight->props.power = bl_power;
+	dbg_hid(PICOLCD_NAME " device ready for suspend, lcd_power=%d\n", bl_power);
+	return 0;
+}
+
+static int picolcd_resume(struct hid_device *hdev)
+{
+	struct picolcd_data *data = hid_get_drvdata(hdev);
+	int ret;
+	ret = picolcd_set_brightness(data->backlight);
+	if (ret)
+		dbg_hid(PICOLCD_NAME " restoring brightness failed: %d\n", ret);
+	ret = picolcd_set_contrast(data->lcd, data->lcd_contrast);
+	if (ret)
+		dbg_hid(PICOLCD_NAME " restoring contrast failed: %d\n", ret);
+	return 0;
+}
+
+static int picolcd_reset_resume(struct hid_device *hdev)
+{
+	int ret;
+	ret = picolcd_reset(hdev);
+	if (ret)
+		dbg_hid(PICOLCD_NAME " resetting our device failed: %d\n", ret);
+	ret = picolcd_fb_reset(hdev, 0);
+	if (ret)
+		dbg_hid(PICOLCD_NAME " restoring framebuffer content failed: %d\n", ret);
+	return 0;
+}
+#endif
+
+
 static int picolcd_probe(struct hid_device *hdev,
 		     const struct hid_device_id *id)
 {
@@ -1057,6 +1097,11 @@
 	.probe =         picolcd_probe,
 	.remove =        picolcd_remove,
 	.raw_event =     picolcd_raw_event,
+#ifdef CONFIG_PM
+	.suspend =       picolcd_suspend,
+	.resume =        picolcd_resume,
+	.reset_resume =  picolcd_reset_resume,
+#endif
 };
 
 static int __init picolcd_init(void)
--
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