platform/geode/geos.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * System Specific setup for Traverse Technologies GEOS.
0004  * At the moment this means setup of GPIO control of LEDs.
0005  *
0006  * Copyright (C) 2008 Constantin Baranov <const@mimas.ru>
0007  * Copyright (C) 2011 Ed Wildgoose <kernel@wildgooses.com>
0008  *                and Philip Prindeville <philipp@redfish-solutions.com>
0009  *
0010  * TODO: There are large similarities with leds-net5501.c
0011  * by Alessandro Zummo <a.zummo@towertech.it>
0012  * In the future leds-net5501.c should be migrated over to platform
0013  */
0014
0015 #include <linux/kernel.h>
0016 #include <linux/init.h>
0017 #include <linux/io.h>
0018 #include <linux/string.h>
0019 #include <linux/leds.h>
0020 #include <linux/platform_device.h>
0021 #include <linux/input.h>
0022 #include <linux/gpio_keys.h>
0023 #include <linux/gpio/machine.h>
0024 #include <linux/dmi.h>
0025
0026 #include <asm/geode.h>
0027
0028 static struct gpio_keys_button geos_gpio_buttons[] = {
0029     {
0030         .code = KEY_RESTART,
0031         .gpio = 3,
0032         .active_low = 1,
0033         .desc = "Reset button",
0034         .type = EV_KEY,
0035         .wakeup = 0,
0036         .debounce_interval = 100,
0037         .can_disable = 0,
0038     }
0039 };
0040 static struct gpio_keys_platform_data geos_buttons_data = {
0041     .buttons = geos_gpio_buttons,
0042     .nbuttons = ARRAY_SIZE(geos_gpio_buttons),
0043     .poll_interval = 20,
0044 };
0045
0046 static struct platform_device geos_buttons_dev = {
0047     .name = "gpio-keys-polled",
0048     .id = 1,
0049     .dev = {
0050         .platform_data = &geos_buttons_data,
0051     }
0052 };
0053
0054 static struct gpio_led geos_leds[] = {
0055     {
0056         .name = "geos:1",
0057         .default_trigger = "default-on",
0058     },
0059     {
0060         .name = "geos:2",
0061         .default_trigger = "default-off",
0062     },
0063     {
0064         .name = "geos:3",
0065         .default_trigger = "default-off",
0066     },
0067 };
0068
0069 static struct gpio_led_platform_data geos_leds_data = {
0070     .num_leds = ARRAY_SIZE(geos_leds),
0071     .leds = geos_leds,
0072 };
0073
0074 static struct gpiod_lookup_table geos_leds_gpio_table = {
0075     .dev_id = "leds-gpio",
0076     .table = {
0077         /* The Geode GPIOs should be on the CS5535 companion chip */
0078         GPIO_LOOKUP_IDX("cs5535-gpio", 6, NULL, 0, GPIO_ACTIVE_LOW),
0079         GPIO_LOOKUP_IDX("cs5535-gpio", 25, NULL, 1, GPIO_ACTIVE_LOW),
0080         GPIO_LOOKUP_IDX("cs5535-gpio", 27, NULL, 2, GPIO_ACTIVE_LOW),
0081         { }
0082     },
0083 };
0084
0085 static struct platform_device geos_leds_dev = {
0086     .name = "leds-gpio",
0087     .id = -1,
0088     .dev.platform_data = &geos_leds_data,
0089 };
0090
0091 static struct platform_device *geos_devs[] __initdata = {
0092     &geos_buttons_dev,
0093     &geos_leds_dev,
0094 };
0095
0096 static void __init register_geos(void)
0097 {
0098     /* Setup LED control through leds-gpio driver */
0099     gpiod_add_lookup_table(&geos_leds_gpio_table);
0100     platform_add_devices(geos_devs, ARRAY_SIZE(geos_devs));
0101 }
0102
0103 static int __init geos_init(void)
0104 {
0105     const char *vendor, *product;
0106
0107     if (!is_geode())
0108         return 0;
0109
0110     vendor = dmi_get_system_info(DMI_SYS_VENDOR);
0111     if (!vendor || strcmp(vendor, "Traverse Technologies"))
0112         return 0;
0113
0114     product = dmi_get_system_info(DMI_PRODUCT_NAME);
0115     if (!product || strcmp(product, "Geos"))
0116         return 0;
0117
0118     printk(KERN_INFO "%s: system is recognized as \"%s %s\"\n",
0119            KBUILD_MODNAME, vendor, product);
0120
0121     register_geos();
0122
0123     return 0;
0124 }
0125 device_initcall(geos_init);