arch/x86/platform/geode/geos.c

   1 /*
   2  * System Specific setup for Traverse Technologies GEOS.
   3  * At the moment this means setup of GPIO control of LEDs.
   4  *
   5  * Copyright (C) 2008 Constantin Baranov <const@mimas.ru>
   6  * Copyright (C) 2011 Ed Wildgoose <kernel@wildgooses.com>
   7  *                and Philip Prindeville <philipp@redfish-solutions.com>
   8  *
   9  * TODO: There are large similarities with leds-net5501.c
  10  * by Alessandro Zummo <a.zummo@towertech.it>
  11  * In the future leds-net5501.c should be migrated over to platform
  12  *
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License version 2
  15  * as published by the Free Software Foundation.
  16  */
  17
  18 #include <linux/kernel.h>
  19 #include <linux/init.h>
  20 #include <linux/io.h>
  21 #include <linux/string.h>
  22 #include <linux/leds.h>
  23 #include <linux/platform_device.h>
  24 #include <linux/gpio.h>
  25 #include <linux/input.h>
  26 #include <linux/gpio_keys.h>
  27 #include <linux/dmi.h>
  28
  29 #include <asm/geode.h>
  30
  31 static struct gpio_keys_button geos_gpio_buttons[] = {
  32         {
  33                 .code = KEY_RESTART,
  34                 .gpio = 3,
  35                 .active_low = 1,
  36                 .desc = "Reset button",
  37                 .type = EV_KEY,
  38                 .wakeup = 0,
  39                 .debounce_interval = 100,
  40                 .can_disable = 0,
  41         }
  42 };
  43 static struct gpio_keys_platform_data geos_buttons_data = {
  44         .buttons = geos_gpio_buttons,
  45         .nbuttons = ARRAY_SIZE(geos_gpio_buttons),
  46         .poll_interval = 20,
  47 };
  48
  49 static struct platform_device geos_buttons_dev = {
  50         .name = "gpio-keys-polled",
  51         .id = 1,
  52         .dev = {
  53                 .platform_data = &geos_buttons_data,
  54         }
  55 };
  56
  57 static struct gpio_led geos_leds[] = {
  58         {
  59                 .name = "geos:1",
  60                 .gpio = 6,
  61                 .default_trigger = "default-on",
  62                 .active_low = 1,
  63         },
  64         {
  65                 .name = "geos:2",
  66                 .gpio = 25,
  67                 .default_trigger = "default-off",
  68                 .active_low = 1,
  69         },
  70         {
  71                 .name = "geos:3",
  72                 .gpio = 27,
  73                 .default_trigger = "default-off",
  74                 .active_low = 1,
  75         },
  76 };
  77
  78 static struct gpio_led_platform_data geos_leds_data = {
  79         .num_leds = ARRAY_SIZE(geos_leds),
  80         .leds = geos_leds,
  81 };
  82
  83 static struct platform_device geos_leds_dev = {
  84         .name = "leds-gpio",
  85         .id = -1,
  86         .dev.platform_data = &geos_leds_data,
  87 };
  88
  89 static struct platform_device *geos_devs[] __initdata = {
  90         &geos_buttons_dev,
  91         &geos_leds_dev,
  92 };
  93
  94 static void __init register_geos(void)
  95 {
  96         /* Setup LED control through leds-gpio driver */
  97         platform_add_devices(geos_devs, ARRAY_SIZE(geos_devs));
  98 }
  99
 100 static int __init geos_init(void)
 101 {
 102         const char *vendor, *product;
 103
 104         if (!is_geode())
 105                 return 0;
 106
 107         vendor = dmi_get_system_info(DMI_SYS_VENDOR);
 108         if (!vendor || strcmp(vendor, "Traverse Technologies"))
 109                 return 0;
 110
 111         product = dmi_get_system_info(DMI_PRODUCT_NAME);
 112         if (!product || strcmp(product, "Geos"))
 113                 return 0;
 114
 115         printk(KERN_INFO "%s: system is recognized as \"%s %s\"\n",
 116                KBUILD_MODNAME, vendor, product);
 117
 118         register_geos();
 119
 120         return 0;
 121 }
 122 device_initcall(geos_init);