/* * System Specific setup for Soekris net5501 * At the moment this means setup of GPIO control of LEDs and buttons * on net5501 boards. * * * Copyright (C) 2008-2009 Tower Technologies * Written by Alessandro Zummo <a.zummo@towertech.it> * * Copyright (C) 2008 Constantin Baranov <const@mimas.ru> * Copyright (C) 2011 Ed Wildgoose <kernel@wildgooses.com> * and Philip Prindeville <philipp@redfish-solutions.com> * * 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/module.h> #include <linux/leds.h> #include <linux/platform_device.h> #include <linux/gpio.h> #include <linux/input.h> #include <linux/gpio_keys.h> #include <asm/geode.h> #define BIOS_REGION_BASE 0xffff0000 #define BIOS_REGION_SIZE 0x00010000 static struct gpio_keys_button net5501_gpio_buttons[] = { { .code = KEY_RESTART, .gpio = 24, .active_low = 1, .desc = "Reset button", .type = EV_KEY, .wakeup = 0, .debounce_interval = 100, .can_disable = 0, } }; static struct gpio_keys_platform_data net5501_buttons_data = { .buttons = net5501_gpio_buttons, .nbuttons = ARRAY_SIZE(net5501_gpio_buttons), .poll_interval = 20, }; static struct platform_device net5501_buttons_dev = { .name = "gpio-keys-polled", .id = 1, .dev = { .platform_data = &net5501_buttons_data, } }; static struct gpio_led net5501_leds[] = { { .name = "net5501:1", .gpio = 6, .default_trigger = "default-on", .active_low = 0, }, }; static struct gpio_led_platform_data net5501_leds_data = { .num_leds = ARRAY_SIZE(net5501_leds), .leds = net5501_leds, }; static struct platform_device net5501_leds_dev = { .name = "leds-gpio", .id = -1, .dev.platform_data = &net5501_leds_data, }; static struct platform_device *net5501_devs[] __initdata = { &net5501_buttons_dev, &net5501_leds_dev, }; static void __init register_net5501(void) { /* Setup LED control through leds-gpio driver */ platform_add_devices(net5501_devs, ARRAY_SIZE(net5501_devs)); } struct net5501_board { u16 offset; u16 len; char *sig; }; static struct net5501_board __initdata boards[] = { { 0xb7b, 7, "net5501" }, /* net5501 v1.33/1.33c */ { 0xb1f, 7, "net5501" }, /* net5501 v1.32i */ }; static bool __init net5501_present(void) { int i; unsigned char *rombase, *bios; bool found = false; rombase = ioremap(BIOS_REGION_BASE, BIOS_REGION_SIZE - 1); if (!rombase) { printk(KERN_ERR "%s: failed to get rombase\n", KBUILD_MODNAME); return found; } bios = rombase + 0x20; /* null terminated */ if (memcmp(bios, "comBIOS", 7)) goto unmap; for (i = 0; i < ARRAY_SIZE(boards); i++) { unsigned char *model = rombase + boards[i].offset; if (!memcmp(model, boards[i].sig, boards[i].len)) { printk(KERN_INFO "%s: system is recognized as \"%s\"\n", KBUILD_MODNAME, model); found = true; break; } } unmap: iounmap(rombase); return found; } static int __init net5501_init(void) { if (!is_geode()) return 0; if (!net5501_present()) return 0; register_net5501(); return 0; } module_init(net5501_init); MODULE_AUTHOR("Philip Prindeville <philipp@redfish-solutions.com>"); MODULE_DESCRIPTION("Soekris net5501 System Setup"); MODULE_LICENSE("GPL");