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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 | // SPDX-License-Identifier: GPL-2.0-only /* * System Specific setup for PCEngines ALIX. * At the moment this means setup of GPIO control of LEDs * on Alix.2/3/6 boards. * * Copyright (C) 2008 Constantin Baranov <const@mimas.ru> * Copyright (C) 2011 Ed Wildgoose <kernel@wildgooses.com> * and Philip Prindeville <philipp@redfish-solutions.com> * * TODO: There are large similarities with leds-net5501.c * by Alessandro Zummo <a.zummo@towertech.it> * In the future leds-net5501.c should be migrated over to platform */ #include <linux/kernel.h> #include <linux/init.h> #include <linux/io.h> #include <linux/string.h> #include <linux/moduleparam.h> #include <linux/leds.h> #include <linux/platform_device.h> #include <linux/input.h> #include <linux/gpio_keys.h> #include <linux/dmi.h> #include <asm/geode.h> #define BIOS_SIGNATURE_TINYBIOS 0xf0000 #define BIOS_SIGNATURE_COREBOOT 0x500 #define BIOS_REGION_SIZE 0x10000 /* * This driver is not modular, but to keep back compatibility * with existing use cases, continuing with module_param is * the easiest way forward. */ static bool force = 0; module_param(force, bool, 0444); /* FIXME: Award bios is not automatically detected as Alix platform */ MODULE_PARM_DESC(force, "Force detection as ALIX.2/ALIX.3 platform"); static struct gpio_keys_button alix_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 alix_buttons_data = { .buttons = alix_gpio_buttons, .nbuttons = ARRAY_SIZE(alix_gpio_buttons), .poll_interval = 20, }; static struct platform_device alix_buttons_dev = { .name = "gpio-keys-polled", .id = 1, .dev = { .platform_data = &alix_buttons_data, } }; static struct gpio_led alix_leds[] = { { .name = "alix:1", .gpio = 6, .default_trigger = "default-on", .active_low = 1, }, { .name = "alix:2", .gpio = 25, .default_trigger = "default-off", .active_low = 1, }, { .name = "alix:3", .gpio = 27, .default_trigger = "default-off", .active_low = 1, }, }; static struct gpio_led_platform_data alix_leds_data = { .num_leds = ARRAY_SIZE(alix_leds), .leds = alix_leds, }; static struct platform_device alix_leds_dev = { .name = "leds-gpio", .id = -1, .dev.platform_data = &alix_leds_data, }; static struct platform_device *alix_devs[] __initdata = { &alix_buttons_dev, &alix_leds_dev, }; static void __init register_alix(void) { /* Setup LED control through leds-gpio driver */ platform_add_devices(alix_devs, ARRAY_SIZE(alix_devs)); } static bool __init alix_present(unsigned long bios_phys, const char *alix_sig, size_t alix_sig_len) { const size_t bios_len = BIOS_REGION_SIZE; const char *bios_virt; const char *scan_end; const char *p; char name[64]; if (force) { printk(KERN_NOTICE "%s: forced to skip BIOS test, " "assume system is ALIX.2/ALIX.3\n", KBUILD_MODNAME); return true; } bios_virt = phys_to_virt(bios_phys); scan_end = bios_virt + bios_len - (alix_sig_len + 2); for (p = bios_virt; p < scan_end; p++) { const char *tail; char *a; if (memcmp(p, alix_sig, alix_sig_len) != 0) continue; memcpy(name, p, sizeof(name)); /* remove the first \0 character from string */ a = strchr(name, '\0'); if (a) *a = ' '; /* cut the string at a newline */ a = strchr(name, '\r'); if (a) *a = '\0'; tail = p + alix_sig_len; if ((tail[0] == '2' || tail[0] == '3' || tail[0] == '6')) { printk(KERN_INFO "%s: system is recognized as \"%s\"\n", KBUILD_MODNAME, name); return true; } } return false; } static bool __init alix_present_dmi(void) { const char *vendor, *product; vendor = dmi_get_system_info(DMI_SYS_VENDOR); if (!vendor || strcmp(vendor, "PC Engines")) return false; product = dmi_get_system_info(DMI_PRODUCT_NAME); if (!product || (strcmp(product, "ALIX.2D") && strcmp(product, "ALIX.6"))) return false; printk(KERN_INFO "%s: system is recognized as \"%s %s\"\n", KBUILD_MODNAME, vendor, product); return true; } static int __init alix_init(void) { const char tinybios_sig[] = "PC Engines ALIX."; const char coreboot_sig[] = "PC Engines\0ALIX."; if (!is_geode()) return 0; if (alix_present(BIOS_SIGNATURE_TINYBIOS, tinybios_sig, sizeof(tinybios_sig) - 1) || alix_present(BIOS_SIGNATURE_COREBOOT, coreboot_sig, sizeof(coreboot_sig) - 1) || alix_present_dmi()) register_alix(); return 0; } device_initcall(alix_init); |