120 lines
3.5 KiB
Diff
120 lines
3.5 KiB
Diff
From 9aa87d67df2e59eea15f70c4e58f8bde10e5953b Mon Sep 17 00:00:00 2001
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From: Harald Welte <laforge@openmoko.org>
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Date: Wed, 8 Oct 2008 11:13:46 +0100
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Subject: [PATCH] This patch adds a framebuffer notifier in order to detect
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FB_BLANK events and switch the JBT6K74 LCM controller into
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its power saving mode.
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This has the potential of saving something like 50mW during screen blank.
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Signed-off-by: Harald Welte <laforge@openmoko.org>
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---
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drivers/video/display/jbt6k74.c | 48 +++++++++++++++++++++++++++++++++++++++
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1 files changed, 48 insertions(+), 0 deletions(-)
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diff --git a/drivers/video/display/jbt6k74.c b/drivers/video/display/jbt6k74.c
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index b406298..9570543 100644
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--- a/drivers/video/display/jbt6k74.c
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+++ b/drivers/video/display/jbt6k74.c
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@@ -3,6 +3,7 @@
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* Copyright (C) 2006-2007 by Openmoko, Inc.
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* Author: Harald Welte <laforge@openmoko.org>,
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* Stefan Schmidt <stefan@openmoko.org>
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+ * Copyright (C) 2008 by Harald Welte <laforge@openmoko.org>
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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@@ -21,6 +22,7 @@
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* MA 02111-1307 USA
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*
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*/
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+
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/module.h>
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@@ -28,6 +30,7 @@
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#include <linux/platform_device.h>
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#include <linux/delay.h>
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#include <linux/jbt6k74.h>
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+#include <linux/fb.h>
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enum jbt_register {
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JBT_REG_SLEEP_IN = 0x10,
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@@ -111,6 +114,7 @@ struct jbt_info {
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enum jbt_state state, last_state;
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struct spi_device *spi_dev;
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struct mutex lock; /* protects tx_buf and reg_cache */
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+ struct notifier_block fb_notif;
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u16 tx_buf[8];
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u16 reg_cache[0xEE];
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int have_resumed;
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@@ -548,6 +552,40 @@ static struct attribute_group jbt_attr_group = {
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.attrs = jbt_sysfs_entries,
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};
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+static int fb_notifier_callback(struct notifier_block *self,
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+ unsigned long event, void *data)
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+{
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+ struct jbt_info *jbt;
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+ struct fb_event *evdata = data;
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+ int fb_blank;
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+
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+ if (event != FB_EVENT_BLANK && event != FB_EVENT_CONBLANK)
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+ return 0;
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+
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+ fb_blank = *(int *)evdata->data;
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+ jbt = container_of(self, struct jbt_info, fb_notif);
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+
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+ switch (fb_blank) {
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+ case FB_BLANK_UNBLANK:
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+ case FB_BLANK_NORMAL:
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+ jbt6k74_enter_state(jbt, JBT_STATE_NORMAL);
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+ jbt6k74_display_onoff(jbt, 1);
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+ break;
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+ case FB_BLANK_VSYNC_SUSPEND:
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+ case FB_BLANK_HSYNC_SUSPEND:
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+ /* FIXME: we disable SLEEP since it would result in
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+ * a visible artefact (white screen) before the backlight
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+ * is dimmed to a dark enough level */
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+ /* jbt6k74_enter_state(jbt, JBT_STATE_SLEEP); */
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+ break;
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+ case FB_BLANK_POWERDOWN:
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+ jbt6k74_enter_state(jbt, JBT_STATE_DEEP_STANDBY);
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+ break;
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+ }
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+
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+ return 0;
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+}
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+
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/* linux device model infrastructure */
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static int __devinit jbt_probe(struct spi_device *spi)
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@@ -595,8 +633,17 @@ static int __devinit jbt_probe(struct spi_device *spi)
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goto err_off;
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}
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+ jbt->fb_notif.notifier_call = fb_notifier_callback;
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+ rc = fb_register_client(&jbt->fb_notif);
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+ if (rc < 0) {
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+ dev_err(&spi->dev, "cannot register notifier\n");
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+ goto err_sysfs;
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+ }
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+
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return 0;
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+err_sysfs:
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+ sysfs_remove_group(&spi->dev.kobj, &jbt_attr_group);
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err_off:
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jbt6k74_display_onoff(jbt, 0);
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err_standby:
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@@ -615,6 +662,7 @@ static int __devexit jbt_remove(struct spi_device *spi)
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/* We don't want to switch off the display in case the user
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* accidentially onloads the module (whose use count normally is 0) */
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+ fb_unregister_client(&jbt->fb_notif);
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sysfs_remove_group(&spi->dev.kobj, &jbt_attr_group);
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dev_set_drvdata(&spi->dev, NULL);
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kfree(jbt);
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--
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1.5.6.5
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