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/module.h>
  23 #include <linux/leds.h>
  24 #include <linux/platform_device.h>
  25 #include <linux/gpio.h>
  26 #include <linux/input.h>
  27 #include <linux/gpio_keys.h>
  28 #include <linux/dmi.h>
  29
  30 #include <asm/geode.h>
  31
  32 static struct gpio_keys_button geos_gpio_buttons[] = {
  33         {
  34                 .code = KEY_RESTART,
  35                 .gpio = 3,
  36                 .active_low = 1,
  37                 .desc = "Reset button",
  38                 .type = EV_KEY,
  39                 .wakeup = 0,
  40                 .debounce_interval = 100,
  41                 .can_disable = 0,
  42         }
  43 };
  44 static struct gpio_keys_platform_data geos_buttons_data = {
  45         .buttons = geos_gpio_buttons,
  46         .nbuttons = ARRAY_SIZE(geos_gpio_buttons),
  47         .poll_interval = 20,
  48 };
  49
  50 static struct platform_device geos_buttons_dev = {
  51         .name = "gpio-keys-polled",
  52         .id = 1,
  53         .dev = {
  54                 .platform_data = &geos_buttons_data,
  55         }
  56 };
  57
  58 static struct gpio_led geos_leds[] = {
  59         {
  60                 .name = "geos:1",
  61                 .gpio = 6,
  62                 .default_trigger = "default-on",
  63                 .active_low = 1,
  64         },
  65         {
  66                 .name = "geos:2",
  67                 .gpio = 25,
  68                 .default_trigger = "default-off",
  69                 .active_low = 1,
  70         },
  71         {
  72                 .name = "geos:3",
  73                 .gpio = 27,
  74                 .default_trigger = "default-off",
  75                 .active_low = 1,
  76         },
  77 };
  78
  79 static struct gpio_led_platform_data geos_leds_data = {
  80         .num_leds = ARRAY_SIZE(geos_leds),
  81         .leds = geos_leds,
  82 };
  83
  84 static struct platform_device geos_leds_dev = {
  85         .name = "leds-gpio",
  86         .id = -1,
  87         .dev.platform_data = &geos_leds_data,
  88 };
  89
  90 static struct __initdata platform_device *geos_devs[] = {
  91         &geos_buttons_dev,
  92         &geos_leds_dev,
  93 };
  94
  95 static void __init register_geos(void)
  96 {
  97         /* Setup LED control through leds-gpio driver */
  98         platform_add_devices(geos_devs, ARRAY_SIZE(geos_devs));
  99 }
 100
 101 static int __init geos_init(void)
 102 {
 103         const char *vendor, *product;
 104
 105         if (!is_geode())
 106                 return 0;
 107
 108         vendor = dmi_get_system_info(DMI_SYS_VENDOR);
 109         if (!vendor || strcmp(vendor, "Traverse Technologies"))
 110                 return 0;
 111
 112         product = dmi_get_system_info(DMI_PRODUCT_NAME);
 113         if (!product || strcmp(product, "Geos"))
 114                 return 0;
 115
 116         printk(KERN_INFO "%s: system is recognized as \"%s %s\"\n",
 117                KBUILD_MODNAME, vendor, product);
 118
 119         register_geos();
 120
 121         return 0;
 122 }
 123
 124 module_init(geos_init);
 125
 126 MODULE_AUTHOR("Philip Prindeville <philipp@redfish-solutions.com>");
 127 MODULE_DESCRIPTION("Traverse Technologies Geos System Setup");
 128 MODULE_LICENSE("GPL");