tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * System Specific setup for Soekris net5501
3 * At the moment this means setup of GPIO control of LEDs and buttons
4 * on net5501 boards.
5 *
6 *
7 * Copyright (C) 2008-2009 Tower Technologies
8 * Written by Alessandro Zummo <a.zummo@towertech.it>
9 *
10 * Copyright (C) 2008 Constantin Baranov <const@mimas.ru>
11 * Copyright (C) 2011 Ed Wildgoose <kernel@wildgooses.com>
12 * and Philip Prindeville <philipp@redfish-solutions.com>
13 *
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License version 2
16 * as published by the Free Software Foundation.
17 */
18
19#include <linux/kernel.h>
20#include <linux/init.h>
21#include <linux/io.h>
22#include <linux/string.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
29#include <asm/geode.h>
30
31#define BIOS_REGION_BASE 0xffff0000
32#define BIOS_REGION_SIZE 0x00010000
33
34static struct gpio_keys_button net5501_gpio_buttons[] = {
35 {
36 .code = KEY_RESTART,
37 .gpio = 24,
38 .active_low = 1,
39 .desc = "Reset button",
40 .type = EV_KEY,
41 .wakeup = 0,
42 .debounce_interval = 100,
43 .can_disable = 0,
44 }
45};
46static struct gpio_keys_platform_data net5501_buttons_data = {
47 .buttons = net5501_gpio_buttons,
48 .nbuttons = ARRAY_SIZE(net5501_gpio_buttons),
49 .poll_interval = 20,
50};
51
52static struct platform_device net5501_buttons_dev = {
53 .name = "gpio-keys-polled",
54 .id = 1,
55 .dev = {
56 .platform_data = &net5501_buttons_data,
57 }
58};
59
60static struct gpio_led net5501_leds[] = {
61 {
62 .name = "net5501:1",
63 .gpio = 6,
64 .default_trigger = "default-on",
65 .active_low = 0,
66 },
67};
68
69static struct gpio_led_platform_data net5501_leds_data = {
70 .num_leds = ARRAY_SIZE(net5501_leds),
71 .leds = net5501_leds,
72};
73
74static struct platform_device net5501_leds_dev = {
75 .name = "leds-gpio",
76 .id = -1,
77 .dev.platform_data = &net5501_leds_data,
78};
79
80static struct platform_device *net5501_devs[] __initdata = {
81 &net5501_buttons_dev,
82 &net5501_leds_dev,
83};
84
85static void __init register_net5501(void)
86{
87 /* Setup LED control through leds-gpio driver */
88 platform_add_devices(net5501_devs, ARRAY_SIZE(net5501_devs));
89}
90
91struct net5501_board {
92 u16 offset;
93 u16 len;
94 char *sig;
95};
96
97static struct net5501_board __initdata boards[] = {
98 { 0xb7b, 7, "net5501" }, /* net5501 v1.33/1.33c */
99 { 0xb1f, 7, "net5501" }, /* net5501 v1.32i */
100};
101
102static bool __init net5501_present(void)
103{
104 int i;
105 unsigned char *rombase, *bios;
106 bool found = false;
107
108 rombase = ioremap(BIOS_REGION_BASE, BIOS_REGION_SIZE - 1);
109 if (!rombase) {
110 printk(KERN_ERR "%s: failed to get rombase\n", KBUILD_MODNAME);
111 return found;
112 }
113
114 bios = rombase + 0x20; /* null terminated */
115
116 if (memcmp(bios, "comBIOS", 7))
117 goto unmap;
118
119 for (i = 0; i < ARRAY_SIZE(boards); i++) {
120 unsigned char *model = rombase + boards[i].offset;
121
122 if (!memcmp(model, boards[i].sig, boards[i].len)) {
123 printk(KERN_INFO "%s: system is recognized as \"%s\"\n",
124 KBUILD_MODNAME, model);
125
126 found = true;
127 break;
128 }
129 }
130
131unmap:
132 iounmap(rombase);
133 return found;
134}
135
136static int __init net5501_init(void)
137{
138 if (!is_geode())
139 return 0;
140
141 if (!net5501_present())
142 return 0;
143
144 register_net5501();
145
146 return 0;
147}
148device_initcall(net5501_init);