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The Kconfig currently controlling compilation of this code is: arch/x86/Kconfig:config ALIX arch/x86/Kconfig: bool "PCEngines ALIX System Support (LED setup)" ...meaning that it currently is not being built as a module by anyone. Lets remove the modular code that is essentially orphaned, so that when reading the driver there is no doubt it is builtin-only. Since module_init translates to device_initcall in the non-modular case, the init ordering remains unchanged with this commit. We replace module.h with moduleparam.h since the file does declare some module parameters, and leaving them as such is currently the easiest way to remain compatible with existing boot arg use cases. We also delete the MODULE_LICENSE tag etc. since all that information is already contained at the top of the file in the comments. Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> Cc: Ed Wildgoose <kernel@wildgooses.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1455491396-30977-5-git-send-email-paul.gortmaker@windriver.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
201 lines
4.7 KiB
C
201 lines
4.7 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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* and Philip Prindeville <philipp@redfish-solutions.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/moduleparam.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 <linux/input.h>
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#include <linux/gpio_keys.h>
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#include <linux/dmi.h>
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#include <asm/geode.h>
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#define BIOS_SIGNATURE_TINYBIOS 0xf0000
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#define BIOS_SIGNATURE_COREBOOT 0x500
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#define BIOS_REGION_SIZE 0x10000
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/*
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* This driver is not modular, but to keep back compatibility
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* with existing use cases, continuing with module_param is
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* the easiest way forward.
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*/
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static bool 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_keys_button alix_gpio_buttons[] = {
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{
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.code = KEY_RESTART,
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.gpio = 24,
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.active_low = 1,
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.desc = "Reset button",
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.type = EV_KEY,
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.wakeup = 0,
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.debounce_interval = 100,
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.can_disable = 0,
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}
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};
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static struct gpio_keys_platform_data alix_buttons_data = {
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.buttons = alix_gpio_buttons,
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.nbuttons = ARRAY_SIZE(alix_gpio_buttons),
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.poll_interval = 20,
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};
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static struct platform_device alix_buttons_dev = {
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.name = "gpio-keys-polled",
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.id = 1,
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.dev = {
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.platform_data = &alix_buttons_data,
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}
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};
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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 struct platform_device *alix_devs[] __initdata = {
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&alix_buttons_dev,
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&alix_leds_dev,
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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_add_devices(alix_devs, ARRAY_SIZE(alix_devs));
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}
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static bool __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 = BIOS_REGION_SIZE;
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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 true;
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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' || tail[0] == '6')) {
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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 true;
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}
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}
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return false;
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}
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static bool __init alix_present_dmi(void)
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{
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const char *vendor, *product;
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vendor = dmi_get_system_info(DMI_SYS_VENDOR);
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if (!vendor || strcmp(vendor, "PC Engines"))
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return false;
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product = dmi_get_system_info(DMI_PRODUCT_NAME);
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if (!product || (strcmp(product, "ALIX.2D") && strcmp(product, "ALIX.6")))
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return false;
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printk(KERN_INFO "%s: system is recognized as \"%s %s\"\n",
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KBUILD_MODNAME, vendor, product);
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return true;
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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(BIOS_SIGNATURE_TINYBIOS, tinybios_sig, sizeof(tinybios_sig) - 1) ||
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alix_present(BIOS_SIGNATURE_COREBOOT, coreboot_sig, sizeof(coreboot_sig) - 1) ||
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alix_present_dmi())
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register_alix();
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return 0;
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}
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device_initcall(alix_init);
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