openwrt/target/linux/generic/patches-2.6.39/105-alix_platform_leds.patch

From: Ed Wildgoose <git@wildgooses.com>
Date: Wed, 3 Aug 2011 00:52:36 +0000 (+1000)
Subject: This new driver replaces the old PCEngines Alix 2/3 LED driver with a new
X-Git-Tag: next-20110812~1^2~75
X-Git-Url: http://git.kernel.org/?p=linux%2Fkernel%2Fgit%2Fnext%2Flinux-next.git;a=commitdiff_plain;h=2cd7b3e8f8078c214c93a2c60cb845500c92df4a;hp=dc849eae35bbf651ab3ee459f5683e1ff780413d

This new driver replaces the old PCEngines Alix 2/3 LED driver with a new
driver that controls the LEDs through the leds-gpio driver.  The old
driver accessed GPIOs directly, which created a conflict and prevented
also loading the cs5535-gpio driver to read other GPIOs on the Alix board.
 With this new driver, we hook into leds-gpio which in turn uses GPIO to
control the LEDs and therefore it's possible to control both the LEDs and
access onboard GPIOs

Driver is moved to platform/geode and any other geode initialisation
modules should move here also.

This driver is inspired by leds-net5501.c by Alessandro Zummo.

Ideally, leds-net5501.c should also be moved to platform/geode.
Additionally the driver relies on parts of the patch: 7f131cf3ed ("leds:
leds-alix2c - take port address from MSR) by Daniel Mack to perform
detection of the Alix board.

Signed-off-by: Ed Wildgoose <kernel@wildgooses.com>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Daniel Mack <daniel@caiaq.de>
Reviewed-by: Grant Likely <grant.likely@secretlab.ca>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -2087,6 +2087,20 @@ config OLPC_XO1
 	---help---
 	  Add support for non-essential features of the OLPC XO-1 laptop.
 
+config ALIX
+	bool "PCEngines ALIX System Support (LED setup)"
+	select GPIOLIB
+	---help---
+	  This option enables system support for the PCEngines ALIX.
+	  At present this just sets up LEDs for GPIO control on
+	  ALIX2/3/6 boards.  However, other system specific setup should
+	  get added here.
+
+	  Note: You must still enable the drivers for GPIO and LED support
+	  (GPIO_CS5535 & LEDS_GPIO) to actually use the LEDs
+
+	  Note: You have to set alix.force=1 for boards with Award BIOS.
+
 endif # X86_32
 
 config AMD_NB
--- a/arch/x86/platform/Makefile
+++ b/arch/x86/platform/Makefile
@@ -1,6 +1,7 @@
 # Platform specific code goes here
 obj-y	+= ce4100/
 obj-y	+= efi/
+obj-y	+= geode/
 obj-y	+= iris/
 obj-y	+= mrst/
 obj-y	+= olpc/
--- /dev/null
+++ b/arch/x86/platform/geode/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_ALIX)		+= alix.o
--- /dev/null
+++ b/arch/x86/platform/geode/alix.c
@@ -0,0 +1,141 @@
+/*
+ * System Specific setup for PCEngines ALIX.
+ * At the moment this means setup of GPIO control of LEDs
+ * on Alix.2/3/6 boards.
+ *
+ *
+ * Copyright (C) 2008 Constantin Baranov <const@mimas.ru>
+ * Copyright (C) 2011 Ed Wildgoose <kernel@wildgooses.com>
+ *
+ * TODO: There are large similarities with leds-net5501.c
+ * by Alessandro Zummo <a.zummo@towertech.it>
+ * In the future leds-net5501.c should be migrated over to platform
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/string.h>
+#include <linux/leds.h>
+#include <linux/platform_device.h>
+#include <linux/gpio.h>
+
+#include <asm/geode.h>
+
+static int force = 0;
+module_param(force, bool, 0444);
+/* FIXME: Award bios is not automatically detected as Alix platform */
+MODULE_PARM_DESC(force, "Force detection as ALIX.2/ALIX.3 platform");
+
+static struct gpio_led alix_leds[] = {
+	{
+		.name = "alix:1",
+		.gpio = 6,
+		.default_trigger = "default-on",
+		.active_low = 1,
+	},
+	{
+		.name = "alix:2",
+		.gpio = 25,
+		.default_trigger = "default-off",
+		.active_low = 1,
+	},
+	{
+		.name = "alix:3",
+		.gpio = 27,
+		.default_trigger = "default-off",
+		.active_low = 1,
+	},
+};
+
+static struct gpio_led_platform_data alix_leds_data = {
+	.num_leds = ARRAY_SIZE(alix_leds),
+	.leds = alix_leds,
+};
+
+static struct platform_device alix_leds_dev = {
+	.name = "leds-gpio",
+	.id = -1,
+	.dev.platform_data = &alix_leds_data,
+};
+
+static void __init register_alix(void)
+{
+	/* Setup LED control through leds-gpio driver */
+	platform_device_register(&alix_leds_dev);
+}
+
+static int __init alix_present(unsigned long bios_phys,
+				const char *alix_sig,
+				size_t alix_sig_len)
+{
+	const size_t bios_len = 0x00010000;
+	const char *bios_virt;
+	const char *scan_end;
+	const char *p;
+	char name[64];
+
+	if (force) {
+		printk(KERN_NOTICE "%s: forced to skip BIOS test, "
+		       "assume system is ALIX.2/ALIX.3\n",
+		       KBUILD_MODNAME);
+		return 1;
+	}
+
+	bios_virt = phys_to_virt(bios_phys);
+	scan_end = bios_virt + bios_len - (alix_sig_len + 2);
+	for (p = bios_virt; p < scan_end; p++) {
+		const char *tail;
+		char *a;
+
+		if (memcmp(p, alix_sig, alix_sig_len) != 0)
+			continue;
+
+		memcpy(name, p, sizeof(name));
+
+		/* remove the first \0 character from string */
+		a = strchr(name, '\0');
+		if (a)
+			*a = ' ';
+
+		/* cut the string at a newline */
+		a = strchr(name, '\r');
+		if (a)
+			*a = '\0';
+
+		tail = p + alix_sig_len;
+		if ((tail[0] == '2' || tail[0] == '3')) {
+			printk(KERN_INFO
+			       "%s: system is recognized as \"%s\"\n",
+			       KBUILD_MODNAME, name);
+			return 1;
+		}
+	}
+
+	return 0;
+}
+
+static int __init alix_init(void)
+{
+	const char tinybios_sig[] = "PC Engines ALIX.";
+	const char coreboot_sig[] = "PC Engines\0ALIX.";
+
+	if (!is_geode())
+		return 0;
+
+	if (alix_present(0xf0000, tinybios_sig, sizeof(tinybios_sig) - 1) ||
+	    alix_present(0x500, coreboot_sig, sizeof(coreboot_sig) - 1))
+		register_alix();
+
+	return 0;
+}
+
+module_init(alix_init);
+
+MODULE_AUTHOR("Ed Wildgoose <kernel@wildgooses.com>");
+MODULE_DESCRIPTION("PCEngines ALIX System Setup");
+MODULE_LICENSE("GPL");
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -107,14 +107,6 @@ config LEDS_WRAP
 	help
 	  This option enables support for the PCEngines WRAP programmable LEDs.
 
-config LEDS_ALIX2
-	tristate "LED Support for ALIX.2 and ALIX.3 series"
-	depends on LEDS_CLASS
-	depends on X86 && !GPIO_CS5535 && !CS5535_GPIO
-	help
-	  This option enables support for the PCEngines ALIX.2 and ALIX.3 LEDs.
-	  You have to set leds-alix2.force=1 for boards with Award BIOS.
-
 config LEDS_H1940
 	tristate "LED Support for iPAQ H1940 device"
 	depends on LEDS_CLASS
--- a/drivers/leds/Makefile
+++ b/drivers/leds/Makefile
@@ -16,7 +16,6 @@ obj-$(CONFIG_LEDS_AMS_DELTA)		+= leds-am
 obj-$(CONFIG_LEDS_NET48XX)		+= leds-net48xx.o
 obj-$(CONFIG_LEDS_NET5501)		+= leds-net5501.o
 obj-$(CONFIG_LEDS_WRAP)			+= leds-wrap.o
-obj-$(CONFIG_LEDS_ALIX2)		+= leds-alix2.o
 obj-$(CONFIG_LEDS_H1940)		+= leds-h1940.o
 obj-$(CONFIG_LEDS_COBALT_QUBE)		+= leds-cobalt-qube.o
 obj-$(CONFIG_LEDS_COBALT_RAQ)		+= leds-cobalt-raq.o
--- a/drivers/leds/leds-alix2.c
+++ /dev/null
@@ -1,239 +0,0 @@
-/*
- * LEDs driver for PCEngines ALIX.2 and ALIX.3
- *
- * Copyright (C) 2008 Constantin Baranov <const@mimas.ru>
- */
-
-#include <linux/err.h>
-#include <linux/io.h>
-#include <linux/kernel.h>
-#include <linux/leds.h>
-#include <linux/module.h>
-#include <linux/platform_device.h>
-#include <linux/string.h>
-#include <linux/pci.h>
-
-static int force = 0;
-module_param(force, bool, 0444);
-MODULE_PARM_DESC(force, "Assume system has ALIX.2/ALIX.3 style LEDs");
-
-#define MSR_LBAR_GPIO		0x5140000C
-#define CS5535_GPIO_SIZE	256
-
-static u32 gpio_base;
-
-static struct pci_device_id divil_pci[] = {
-	{ PCI_DEVICE(PCI_VENDOR_ID_NS,  PCI_DEVICE_ID_NS_CS5535_ISA) },
-	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CS5536_ISA) },
-	{ } /* NULL entry */
-};
-MODULE_DEVICE_TABLE(pci, divil_pci);
-
-struct alix_led {
-	struct led_classdev cdev;
-	unsigned short port;
-	unsigned int on_value;
-	unsigned int off_value;
-};
-
-static void alix_led_set(struct led_classdev *led_cdev,
-			 enum led_brightness brightness)
-{
-	struct alix_led *led_dev =
-		container_of(led_cdev, struct alix_led, cdev);
-
-	if (brightness)
-		outl(led_dev->on_value, gpio_base + led_dev->port);
-	else
-		outl(led_dev->off_value, gpio_base + led_dev->port);
-}
-
-static struct alix_led alix_leds[] = {
-	{
-		.cdev = {
-			.name = "alix:1",
-			.brightness_set = alix_led_set,
-		},
-		.port = 0x00,
-		.on_value = 1 << 22,
-		.off_value = 1 << 6,
-	},
-	{
-		.cdev = {
-			.name = "alix:2",
-			.brightness_set = alix_led_set,
-		},
-		.port = 0x80,
-		.on_value = 1 << 25,
-		.off_value = 1 << 9,
-	},
-	{
-		.cdev = {
-			.name = "alix:3",
-			.brightness_set = alix_led_set,
-		},
-		.port = 0x80,
-		.on_value = 1 << 27,
-		.off_value = 1 << 11,
-	},
-};
-
-static int __init alix_led_probe(struct platform_device *pdev)
-{
-	int i;
-	int ret;
-
-	for (i = 0; i < ARRAY_SIZE(alix_leds); i++) {
-		alix_leds[i].cdev.flags |= LED_CORE_SUSPENDRESUME;
-		ret = led_classdev_register(&pdev->dev, &alix_leds[i].cdev);
-		if (ret < 0)
-			goto fail;
-	}
-	return 0;
-
-fail:
-	while (--i >= 0)
-		led_classdev_unregister(&alix_leds[i].cdev);
-	return ret;
-}
-
-static int alix_led_remove(struct platform_device *pdev)
-{
-	int i;
-
-	for (i = 0; i < ARRAY_SIZE(alix_leds); i++)
-		led_classdev_unregister(&alix_leds[i].cdev);
-	return 0;
-}
-
-static struct platform_driver alix_led_driver = {
-	.remove = alix_led_remove,
-	.driver = {
-		.name = KBUILD_MODNAME,
-		.owner = THIS_MODULE,
-	},
-};
-
-static int __init alix_present(unsigned long bios_phys,
-				const char *alix_sig,
-				size_t alix_sig_len)
-{
-	const size_t bios_len = 0x00010000;
-	const char *bios_virt;
-	const char *scan_end;
-	const char *p;
-	char name[64];
-
-	if (force) {
-		printk(KERN_NOTICE "%s: forced to skip BIOS test, "
-		       "assume system has ALIX.2 style LEDs\n",
-		       KBUILD_MODNAME);
-		return 1;
-	}
-
-	bios_virt = phys_to_virt(bios_phys);
-	scan_end = bios_virt + bios_len - (alix_sig_len + 2);
-	for (p = bios_virt; p < scan_end; p++) {
-		const char *tail;
-		char *a;
-
-		if (memcmp(p, alix_sig, alix_sig_len) != 0)
-			continue;
-
-		memcpy(name, p, sizeof(name));
-
-		/* remove the first \0 character from string */
-		a = strchr(name, '\0');
-		if (a)
-			*a = ' ';
-
-		/* cut the string at a newline */
-		a = strchr(name, '\r');
-		if (a)
-			*a = '\0';
-
-		tail = p + alix_sig_len;
-		if ((tail[0] == '2' || tail[0] == '3')) {
-			printk(KERN_INFO
-			       "%s: system is recognized as \"%s\"\n",
-			       KBUILD_MODNAME, name);
-			return 1;
-		}
-	}
-
-	return 0;
-}
-
-static struct platform_device *pdev;
-
-static int __init alix_pci_led_init(void)
-{
-	u32 low, hi;
-
-	if (pci_dev_present(divil_pci) == 0) {
-		printk(KERN_WARNING KBUILD_MODNAME": DIVIL not found\n");
-		return -ENODEV;
-	}
-
-	/* Grab the GPIO I/O range */
-	rdmsr(MSR_LBAR_GPIO, low, hi);
-
-	/* Check the mask and whether GPIO is enabled (sanity check) */
-	if (hi != 0x0000f001) {
-		printk(KERN_WARNING KBUILD_MODNAME": GPIO not enabled\n");
-		return -ENODEV;
-	}
-
-	/* Mask off the IO base address */
-	gpio_base = low & 0x0000ff00;
-
-	if (!request_region(gpio_base, CS5535_GPIO_SIZE, KBUILD_MODNAME)) {
-		printk(KERN_ERR KBUILD_MODNAME": can't allocate I/O for GPIO\n");
-		return -ENODEV;
-	}
-
-	/* Set GPIO function to output */
-	outl(1 << 6, gpio_base + 0x04);
-	outl(1 << 9, gpio_base + 0x84);
-	outl(1 << 11, gpio_base + 0x84);
-
-	return 0;
-}
-
-static int __init alix_led_init(void)
-{
-	int ret = -ENODEV;
-	const char tinybios_sig[] = "PC Engines ALIX.";
-	const char coreboot_sig[] = "PC Engines\0ALIX.";
-
-	if (alix_present(0xf0000, tinybios_sig, sizeof(tinybios_sig) - 1) ||
-	    alix_present(0x500, coreboot_sig, sizeof(coreboot_sig) - 1))
-		ret = alix_pci_led_init();
-
-	if (ret < 0)
-		return ret;
-
-	pdev = platform_device_register_simple(KBUILD_MODNAME, -1, NULL, 0);
-	if (!IS_ERR(pdev)) {
-		ret = platform_driver_probe(&alix_led_driver, alix_led_probe);
-		if (ret)
-			platform_device_unregister(pdev);
-	} else
-		ret = PTR_ERR(pdev);
-
-	return ret;
-}
-
-static void __exit alix_led_exit(void)
-{
-	platform_device_unregister(pdev);
-	platform_driver_unregister(&alix_led_driver);
-	release_region(gpio_base, CS5535_GPIO_SIZE);
-}
-
-module_init(alix_led_init);
-module_exit(alix_led_exit);
-
-MODULE_AUTHOR("Constantin Baranov <const@mimas.ru>");
-MODULE_DESCRIPTION("PCEngines ALIX.2 and ALIX.3 LED driver");
-MODULE_LICENSE("GPL");