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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 | // SPDX-License-Identifier: GPL-2.0-only /* * System Specific setup for Soekris net5501 * At the moment this means setup of GPIO control of LEDs and buttons * on net5501 boards. * * Copyright (C) 2008-2009 Tower Technologies * Written by Alessandro Zummo <a.zummo@towertech.it> * * Copyright (C) 2008 Constantin Baranov <const@mimas.ru> * Copyright (C) 2011 Ed Wildgoose <kernel@wildgooses.com> * and Philip Prindeville <philipp@redfish-solutions.com> */ #include <linux/kernel.h> #include <linux/init.h> #include <linux/io.h> #include <linux/string.h> #include <linux/leds.h> #include <linux/platform_device.h> #include <linux/input.h> #include <linux/gpio_keys.h> #include <linux/gpio/machine.h> #include <asm/geode.h> #define BIOS_REGION_BASE 0xffff0000 #define BIOS_REGION_SIZE 0x00010000 static struct gpio_keys_button net5501_gpio_buttons[] = { { .code = KEY_RESTART, .gpio = 24, .active_low = 1, .desc = "Reset button", .type = EV_KEY, .wakeup = 0, .debounce_interval = 100, .can_disable = 0, } }; static struct gpio_keys_platform_data net5501_buttons_data = { .buttons = net5501_gpio_buttons, .nbuttons = ARRAY_SIZE(net5501_gpio_buttons), .poll_interval = 20, }; static struct platform_device net5501_buttons_dev = { .name = "gpio-keys-polled", .id = 1, .dev = { .platform_data = &net5501_buttons_data, } }; static struct gpio_led net5501_leds[] = { { .name = "net5501:1", .default_trigger = "default-on", }, }; static struct gpio_led_platform_data net5501_leds_data = { .num_leds = ARRAY_SIZE(net5501_leds), .leds = net5501_leds, }; static struct gpiod_lookup_table net5501_leds_gpio_table = { .dev_id = "leds-gpio", .table = { /* The Geode GPIOs should be on the CS5535 companion chip */ GPIO_LOOKUP_IDX("cs5535-gpio", 6, NULL, 0, GPIO_ACTIVE_HIGH), { } }, }; static struct platform_device net5501_leds_dev = { .name = "leds-gpio", .id = -1, .dev.platform_data = &net5501_leds_data, }; static struct platform_device *net5501_devs[] __initdata = { &net5501_buttons_dev, &net5501_leds_dev, }; static void __init register_net5501(void) { /* Setup LED control through leds-gpio driver */ gpiod_add_lookup_table(&net5501_leds_gpio_table); platform_add_devices(net5501_devs, ARRAY_SIZE(net5501_devs)); } struct net5501_board { u16 offset; u16 len; char *sig; }; static struct net5501_board __initdata boards[] = { { 0xb7b, 7, "net5501" }, /* net5501 v1.33/1.33c */ { 0xb1f, 7, "net5501" }, /* net5501 v1.32i */ }; static bool __init net5501_present(void) { int i; unsigned char *rombase, *bios; bool found = false; rombase = ioremap(BIOS_REGION_BASE, BIOS_REGION_SIZE - 1); if (!rombase) { printk(KERN_ERR "%s: failed to get rombase\n", KBUILD_MODNAME); return found; } bios = rombase + 0x20; /* null terminated */ if (memcmp(bios, "comBIOS", 7)) goto unmap; for (i = 0; i < ARRAY_SIZE(boards); i++) { unsigned char *model = rombase + boards[i].offset; if (!memcmp(model, boards[i].sig, boards[i].len)) { printk(KERN_INFO "%s: system is recognized as \"%s\"\n", KBUILD_MODNAME, model); found = true; break; } } unmap: iounmap(rombase); return found; } static int __init net5501_init(void) { if (!is_geode()) return 0; if (!net5501_present()) return 0; register_net5501(); return 0; } device_initcall(net5501_init); |