linux-kernel - [PATCH v6 8/8] hid: add PM support to PicoLCD device

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Message-ID: <20100330224328.685f74ef@neptune.home>
Date:	Tue, 30 Mar 2010 22:43:28 +0200
From:	Bruno Prémont <bonbons@...ux-vserver.org>
To:	Jiri Kosina <jkosina@...e.cz>
Cc:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	linux-input@...r.kernel.org, linux-usb@...r.kernel.org,
	linux-fbdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	"Rick L. Vinyard Jr." <rvinyard@...nmsu.edu>,
	Nicu Pavel <npavel@...ner.com>,
	Oliver Neukum <oliver@...kum.org>,
	Jaya Kumar <jayakumar.lkml@...il.com>
Subject: [PATCH v6 8/8] hid: add PM support to PicoLCD device

Add PM support in order to turn off backlight on suspend, restore
it on resume and especially restore complete state on reset-resume.

Signed-off-by: Bruno Prémont <bonbons@...ux-vserver.org>
---
 drivers/hid/hid-picolcd.c |   42 ++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 42 insertions(+), 0 deletions(-)

diff --git a/drivers/hid/hid-picolcd.c b/drivers/hid/hid-picolcd.c
index fe1f772..daa7c5d 100644
--- a/drivers/hid/hid-picolcd.c
+++ b/drivers/hid/hid-picolcd.c
@@ -2255,6 +2255,43 @@ static int picolcd_raw_event(struct hid_device *hdev,
 	return 1;
 }
 
+#ifdef CONFIG_PM
+static int picolcd_suspend(struct hid_device *hdev)
+{
+	picolcd_suspend_backlight(hid_get_drvdata(hdev));
+	dbg_hid(PICOLCD_NAME " device ready for suspend\n");
+	return 0;
+}
+
+static int picolcd_resume(struct hid_device *hdev)
+{
+	int ret;
+	ret = picolcd_resume_backlight(hid_get_drvdata(hdev));
+	if (ret)
+		dbg_hid(PICOLCD_NAME " restoring backlight 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(hid_get_drvdata(hdev), 0);
+	if (ret)
+		dbg_hid(PICOLCD_NAME " restoring framebuffer content failed: %d\n", ret);
+	ret = picolcd_resume_lcd(hid_get_drvdata(hdev));
+	if (ret)
+		dbg_hid(PICOLCD_NAME " restoring lcd failed: %d\n", ret);
+	ret = picolcd_resume_backlight(hid_get_drvdata(hdev));
+	if (ret)
+		dbg_hid(PICOLCD_NAME " restoring backlight failed: %d\n", ret);
+	picolcd_leds_set(hid_get_drvdata(hdev));
+	return 0;
+}
+#endif
+
 /* initialize keypad input device */
 static int picolcd_init_keys(struct picolcd_data *data,
 		struct hid_report *report)
@@ -2530,6 +2567,11 @@ static struct hid_driver picolcd_driver = {
 	.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)
-- 
1.6.4.4

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