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/gpio/machine.h>
24#include <linux/dmi.h>
25
26#include <asm/geode.h>
27
28static struct gpio_keys_button geos_gpio_buttons[] = {
29	{
30		.code = KEY_RESTART,
31		.gpio = 3,
32		.active_low = 1,
33		.desc = "Reset button",
34		.type = EV_KEY,
35		.wakeup = 0,
36		.debounce_interval = 100,
37		.can_disable = 0,
38	}
39};
40static struct gpio_keys_platform_data geos_buttons_data = {
41	.buttons = geos_gpio_buttons,
42	.nbuttons = ARRAY_SIZE(geos_gpio_buttons),
43	.poll_interval = 20,
44};
45
46static struct platform_device geos_buttons_dev = {
47	.name = "gpio-keys-polled",
48	.id = 1,
49	.dev = {
50		.platform_data = &geos_buttons_data,
51	}
52};
53
54static struct gpio_led geos_leds[] = {
55	{
56		.name = "geos:1",
57		.default_trigger = "default-on",
58	},
59	{
60		.name = "geos:2",
61		.default_trigger = "default-off",
62	},
63	{
64		.name = "geos:3",
65		.default_trigger = "default-off",
66	},
67};
68
69static struct gpio_led_platform_data geos_leds_data = {
70	.num_leds = ARRAY_SIZE(geos_leds),
71	.leds = geos_leds,
72};
73
74static struct gpiod_lookup_table geos_leds_gpio_table = {
75	.dev_id = "leds-gpio",
76	.table = {
77		/* The Geode GPIOs should be on the CS5535 companion chip */
78		GPIO_LOOKUP_IDX("cs5535-gpio", 6, NULL, 0, GPIO_ACTIVE_LOW),
79		GPIO_LOOKUP_IDX("cs5535-gpio", 25, NULL, 1, GPIO_ACTIVE_LOW),
80		GPIO_LOOKUP_IDX("cs5535-gpio", 27, NULL, 2, GPIO_ACTIVE_LOW),
81		{ }
82	},
83};
84
85static struct platform_device geos_leds_dev = {
86	.name = "leds-gpio",
87	.id = -1,
88	.dev.platform_data = &geos_leds_data,
89};
90
91static struct platform_device *geos_devs[] __initdata = {
92	&geos_buttons_dev,
93	&geos_leds_dev,
94};
95
96static void __init register_geos(void)
97{
98	/* Setup LED control through leds-gpio driver */
99	gpiod_add_lookup_table(&geos_leds_gpio_table);
100	platform_add_devices(geos_devs, ARRAY_SIZE(geos_devs));
101}
102
103static int __init geos_init(void)
104{
105	const char *vendor, *product;
106
107	if (!is_geode())
108		return 0;
109
110	vendor = dmi_get_system_info(DMI_SYS_VENDOR);
111	if (!vendor || strcmp(vendor, "Traverse Technologies"))
112		return 0;
113
114	product = dmi_get_system_info(DMI_PRODUCT_NAME);
115	if (!product || strcmp(product, "Geos"))
116		return 0;
117
118	printk(KERN_INFO "%s: system is recognized as \"%s %s\"\n",
119	       KBUILD_MODNAME, vendor, product);
120
121	register_geos();
122
123	return 0;
124}
125device_initcall(geos_init);
126