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d4f3e35017
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 as requested by Grant 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.
[akpm@linux-foundation.org: include module.h]
Signed-off-by: Ed Wildgoose <kernel@wildgooses.com>
Cc: git@wildgooses.com
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Daniel Mack <daniel@caiaq.de>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Reviewed-by: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
143 lines
3.2 KiB
C
143 lines
3.2 KiB
C
/*
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* System Specific setup for PCEngines ALIX.
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* At the moment this means setup of GPIO control of LEDs
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* on Alix.2/3/6 boards.
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*
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*
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* Copyright (C) 2008 Constantin Baranov <const@mimas.ru>
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* Copyright (C) 2011 Ed Wildgoose <kernel@wildgooses.com>
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*
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* TODO: There are large similarities with leds-net5501.c
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* by Alessandro Zummo <a.zummo@towertech.it>
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* In the future leds-net5501.c should be migrated over to platform
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/io.h>
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#include <linux/string.h>
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#include <linux/module.h>
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#include <linux/leds.h>
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#include <linux/platform_device.h>
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#include <linux/gpio.h>
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#include <asm/geode.h>
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static int force = 0;
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module_param(force, bool, 0444);
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/* FIXME: Award bios is not automatically detected as Alix platform */
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MODULE_PARM_DESC(force, "Force detection as ALIX.2/ALIX.3 platform");
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static struct gpio_led alix_leds[] = {
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{
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.name = "alix:1",
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.gpio = 6,
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.default_trigger = "default-on",
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.active_low = 1,
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},
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{
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.name = "alix:2",
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.gpio = 25,
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.default_trigger = "default-off",
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.active_low = 1,
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},
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{
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.name = "alix:3",
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.gpio = 27,
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.default_trigger = "default-off",
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.active_low = 1,
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},
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};
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static struct gpio_led_platform_data alix_leds_data = {
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.num_leds = ARRAY_SIZE(alix_leds),
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.leds = alix_leds,
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};
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static struct platform_device alix_leds_dev = {
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.name = "leds-gpio",
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.id = -1,
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.dev.platform_data = &alix_leds_data,
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};
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static void __init register_alix(void)
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{
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/* Setup LED control through leds-gpio driver */
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platform_device_register(&alix_leds_dev);
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}
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static int __init alix_present(unsigned long bios_phys,
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const char *alix_sig,
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size_t alix_sig_len)
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{
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const size_t bios_len = 0x00010000;
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const char *bios_virt;
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const char *scan_end;
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const char *p;
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char name[64];
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if (force) {
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printk(KERN_NOTICE "%s: forced to skip BIOS test, "
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"assume system is ALIX.2/ALIX.3\n",
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KBUILD_MODNAME);
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return 1;
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}
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bios_virt = phys_to_virt(bios_phys);
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scan_end = bios_virt + bios_len - (alix_sig_len + 2);
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for (p = bios_virt; p < scan_end; p++) {
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const char *tail;
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char *a;
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if (memcmp(p, alix_sig, alix_sig_len) != 0)
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continue;
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memcpy(name, p, sizeof(name));
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/* remove the first \0 character from string */
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a = strchr(name, '\0');
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if (a)
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*a = ' ';
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/* cut the string at a newline */
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a = strchr(name, '\r');
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if (a)
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*a = '\0';
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tail = p + alix_sig_len;
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if ((tail[0] == '2' || tail[0] == '3')) {
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printk(KERN_INFO
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"%s: system is recognized as \"%s\"\n",
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KBUILD_MODNAME, name);
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return 1;
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}
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}
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return 0;
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}
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static int __init alix_init(void)
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{
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const char tinybios_sig[] = "PC Engines ALIX.";
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const char coreboot_sig[] = "PC Engines\0ALIX.";
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if (!is_geode())
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return 0;
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if (alix_present(0xf0000, tinybios_sig, sizeof(tinybios_sig) - 1) ||
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alix_present(0x500, coreboot_sig, sizeof(coreboot_sig) - 1))
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register_alix();
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return 0;
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}
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module_init(alix_init);
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MODULE_AUTHOR("Ed Wildgoose <kernel@wildgooses.com>");
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MODULE_DESCRIPTION("PCEngines ALIX System Setup");
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MODULE_LICENSE("GPL");
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