[PATCH] Keyboard backlight driver for Oct 2005 PowerBooks
Michael Hanselmann
linux-kernel at hansmi.ch
Sun Aug 27 22:30:15 EST 2006
This driver provides an interface to the keyboard backlight on Oct 2005
PowerBooks, which have the backlight behind the PMU. This driver doesn't
support the I²C variant used in earlier PowerBooks.
Signed-off-by: Michael Hanselmann <linux-kernel at hansmi.ch>
---
diff -Nrup --exclude-from linux-exclude-from linux-2.6.18-rc4-git1.orig/drivers/macintosh/Kconfig linux-2.6.18-rc4-git1/drivers/macintosh/Kconfig
--- linux-2.6.18-rc4-git1.orig/drivers/macintosh/Kconfig 2006-08-26 22:24:36.000000000 +0200
+++ linux-2.6.18-rc4-git1/drivers/macintosh/Kconfig 2006-08-27 02:39:05.000000000 +0200
@@ -99,6 +99,14 @@ config ADB_PMU_LED_IDE
This option makes the front LED default to the IDE trigger
so that it blinks on IDE activity.
+config ADB_PMU_ALS_LED
+ bool "Support for keyboard backlight"
+ depends on ADB_PMU
+ select NEW_LEDS
+ select LEDS_CLASS
+ help
+ Support for the keyboard backlight on Oct 2005 PowerBooks.
+
config PMAC_SMU
bool "Support for SMU based PowerMacs"
depends on PPC_PMAC64
diff -Nrup --exclude-from linux-exclude-from linux-2.6.18-rc4-git1.orig/drivers/macintosh/Makefile linux-2.6.18-rc4-git1/drivers/macintosh/Makefile
--- linux-2.6.18-rc4-git1.orig/drivers/macintosh/Makefile 2006-08-26 22:24:36.000000000 +0200
+++ linux-2.6.18-rc4-git1/drivers/macintosh/Makefile 2006-08-27 02:39:55.000000000 +0200
@@ -13,6 +13,7 @@ obj-$(CONFIG_ANSLCD) += ans-lcd.o
obj-$(CONFIG_ADB_PMU) += via-pmu.o via-pmu-event.o
obj-$(CONFIG_ADB_PMU_LED) += via-pmu-led.o
+obj-$(CONFIG_ADB_PMU_ALS_LED) += via-pmu-als-led.o
obj-$(CONFIG_PMAC_BACKLIGHT) += via-pmu-backlight.o
obj-$(CONFIG_ADB_CUDA) += via-cuda.o
obj-$(CONFIG_PMAC_APM_EMU) += apm_emu.o
diff -Nrup --exclude-from linux-exclude-from linux-2.6.18-rc4-git1.orig/drivers/macintosh/via-pmu-als-led.c linux-2.6.18-rc4-git1/drivers/macintosh/via-pmu-als-led.c
--- linux-2.6.18-rc4-git1.orig/drivers/macintosh/via-pmu-als-led.c 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.18-rc4-git1/drivers/macintosh/via-pmu-als-led.c 2006-08-27 04:01:16.000000000 +0200
@@ -0,0 +1,107 @@
+/*
+ * Driver for keyboard backlight on Oct 2005 PowerBooks
+ *
+ * Copyright 2006 Michael Hanselmann <linux-kernel at hansmi.ch>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ */
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <linux/leds.h>
+#include <linux/adb.h>
+#include <linux/pmu.h>
+#include <asm/prom.h>
+
+static spinlock_t ams_led_pmu_lock;
+static struct adb_request pmu_req = {
+ .complete = 1,
+};
+static int sleeping;
+static int pmu_cmd;
+
+static void als_led_pmu_set(struct led_classdev *led_cdev,
+ enum led_brightness brightness)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&ams_led_pmu_lock, flags);
+
+ if (pmu_req.complete && !sleeping) {
+ if (brightness < 0)
+ brightness = 0;
+ else if (brightness > 255)
+ brightness = 255;
+
+ pmu_request(&pmu_req, NULL, 4, pmu_cmd, 0, 0, brightness);
+ }
+
+ spin_unlock_irqrestore(&ams_led_pmu_lock, flags);
+}
+
+static struct led_classdev als_led = {
+ .name = "als-led-pmu",
+ .brightness_set = als_led_pmu_set,
+};
+
+#ifdef CONFIG_PM
+static int als_led_pmu_sleep_call(struct pmu_sleep_notifier *self, int when)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&ams_led_pmu_lock, flags);
+
+ switch (when) {
+ case PBOOK_SLEEP_REQUEST:
+ sleeping = 1;
+ break;
+ case PBOOK_WAKE:
+ sleeping = 0;
+ break;
+ default:
+ /* do nothing */
+ break;
+ }
+
+ spin_unlock_irqrestore(&ams_led_pmu_lock, flags);
+
+ return PBOOK_SLEEP_OK;
+}
+
+static struct pmu_sleep_notifier als_led_pmu_sleep_notif = {
+ .notifier_call = als_led_pmu_sleep_call,
+};
+#endif
+
+static int __init als_led_pmu_init(void)
+{
+ struct device_node *np;
+ u32 *reg;
+
+ np = of_find_node_by_name(NULL, "als-controls");
+ if (!np)
+ return -ENODEV;
+
+ reg = (u32*)get_property(np, "reg", NULL);
+ if (!reg || !*reg)
+ return -ENODEV;
+
+ pmu_cmd = ((*reg) >> 8) & 0xff;
+
+ of_node_put(np);
+
+ spin_lock_init(&ams_led_pmu_lock);
+
+#ifdef CONFIG_PM
+ pmu_register_sleep_notifier(&als_led_pmu_sleep_notif);
+#endif
+
+ return led_classdev_register(NULL, &als_led);
+}
+
+late_initcall(als_led_pmu_init);
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