arch/x86/platform/geode/geos.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * System Specific setup for Traverse Technologies GEOS.
   4  * At the moment this means setup of GPIO control of LEDs.
   5  *
   6  * Copyright (C) 2008 Constantin Baranov <const@mimas.ru>
   7  * Copyright (C) 2011 Ed Wildgoose <kernel@wildgooses.com>
   8  *                and Philip Prindeville <philipp@redfish-solutions.com>
   9  *
  10  * TODO: There are large similarities with leds-net5501.c
  11  * by Alessandro Zummo <a.zummo@towertech.it>
  12  * In the future leds-net5501.c should be migrated over to platform
  13  */
  14
  15 #include <linux/kernel.h>
  16 #include <linux/init.h>
  17 #include <linux/io.h>
  18 #include <linux/string.h>
  19 #include <linux/leds.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/input.h>
  22 #include <linux/gpio_keys.h>
  23 #include <linux/dmi.h>
  24
  25 #include <asm/geode.h>
  26
  27 static struct gpio_keys_button geos_gpio_buttons[] = {
  28         {
  29                 .code = KEY_RESTART,
  30                 .gpio = 3,
  31                 .active_low = 1,
  32                 .desc = "Reset button",
  33                 .type = EV_KEY,
  34                 .wakeup = 0,
  35                 .debounce_interval = 100,
  36                 .can_disable = 0,
  37         }
  38 };
  39 static struct gpio_keys_platform_data geos_buttons_data = {
  40         .buttons = geos_gpio_buttons,
  41         .nbuttons = ARRAY_SIZE(geos_gpio_buttons),
  42         .poll_interval = 20,
  43 };
  44
  45 static struct platform_device geos_buttons_dev = {
  46         .name = "gpio-keys-polled",
  47         .id = 1,
  48         .dev = {
  49                 .platform_data = &geos_buttons_data,
  50         }
  51 };
  52
  53 static struct gpio_led geos_leds[] = {
  54         {
  55                 .name = "geos:1",
  56                 .gpio = 6,
  57                 .default_trigger = "default-on",
  58                 .active_low = 1,
  59         },
  60         {
  61                 .name = "geos:2",
  62                 .gpio = 25,
  63                 .default_trigger = "default-off",
  64                 .active_low = 1,
  65         },
  66         {
  67                 .name = "geos:3",
  68                 .gpio = 27,
  69                 .default_trigger = "default-off",
  70                 .active_low = 1,
  71         },
  72 };
  73
  74 static struct gpio_led_platform_data geos_leds_data = {
  75         .num_leds = ARRAY_SIZE(geos_leds),
  76         .leds = geos_leds,
  77 };
  78
  79 static struct platform_device geos_leds_dev = {
  80         .name = "leds-gpio",
  81         .id = -1,
  82         .dev.platform_data = &geos_leds_data,
  83 };
  84
  85 static struct platform_device *geos_devs[] __initdata = {
  86         &geos_buttons_dev,
  87         &geos_leds_dev,
  88 };
  89
  90 static void __init register_geos(void)
  91 {
  92         /* Setup LED control through leds-gpio driver */
  93         platform_add_devices(geos_devs, ARRAY_SIZE(geos_devs));
  94 }
  95
  96 static int __init geos_init(void)
  97 {
  98         const char *vendor, *product;
  99
 100         if (!is_geode())
 101                 return 0;
 102
 103         vendor = dmi_get_system_info(DMI_SYS_VENDOR);
 104         if (!vendor || strcmp(vendor, "Traverse Technologies"))
 105                 return 0;
 106
 107         product = dmi_get_system_info(DMI_PRODUCT_NAME);
 108         if (!product || strcmp(product, "Geos"))
 109                 return 0;
 110
 111         printk(KERN_INFO "%s: system is recognized as \"%s %s\"\n",
 112                KBUILD_MODNAME, vendor, product);
 113
 114         register_geos();
 115
 116         return 0;
 117 }
 118 device_initcall(geos_init);