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202 lines
4.9 KiB
202 lines
4.9 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* System Specific setup for PCEngines ALIX. |
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* At the moment this means setup of GPIO control of LEDs |
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* on Alix.2/3/6 boards. |
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* |
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* Copyright (C) 2008 Constantin Baranov <[email protected]> |
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* Copyright (C) 2011 Ed Wildgoose <[email protected]> |
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* and Philip Prindeville <[email protected]> |
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* |
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* TODO: There are large similarities with leds-net5501.c |
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* by Alessandro Zummo <[email protected]> |
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* In the future leds-net5501.c should be migrated over to platform |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/init.h> |
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#include <linux/io.h> |
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#include <linux/string.h> |
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#include <linux/moduleparam.h> |
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#include <linux/leds.h> |
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#include <linux/platform_device.h> |
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#include <linux/input.h> |
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#include <linux/gpio_keys.h> |
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#include <linux/gpio/machine.h> |
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#include <linux/dmi.h> |
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#include <asm/geode.h> |
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#define BIOS_SIGNATURE_TINYBIOS 0xf0000 |
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#define BIOS_SIGNATURE_COREBOOT 0x500 |
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#define BIOS_REGION_SIZE 0x10000 |
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/* |
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* This driver is not modular, but to keep back compatibility |
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* with existing use cases, continuing with module_param is |
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* the easiest way forward. |
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*/ |
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static bool force = 0; |
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module_param(force, bool, 0444); |
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/* FIXME: Award bios is not automatically detected as Alix platform */ |
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MODULE_PARM_DESC(force, "Force detection as ALIX.2/ALIX.3 platform"); |
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static struct gpio_keys_button alix_gpio_buttons[] = { |
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{ |
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.code = KEY_RESTART, |
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.gpio = 24, |
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.active_low = 1, |
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.desc = "Reset button", |
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.type = EV_KEY, |
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.wakeup = 0, |
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.debounce_interval = 100, |
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.can_disable = 0, |
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} |
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}; |
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static struct gpio_keys_platform_data alix_buttons_data = { |
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.buttons = alix_gpio_buttons, |
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.nbuttons = ARRAY_SIZE(alix_gpio_buttons), |
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.poll_interval = 20, |
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}; |
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static struct platform_device alix_buttons_dev = { |
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.name = "gpio-keys-polled", |
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.id = 1, |
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.dev = { |
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.platform_data = &alix_buttons_data, |
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} |
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}; |
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static struct gpio_led alix_leds[] = { |
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{ |
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.name = "alix:1", |
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.default_trigger = "default-on", |
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}, |
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{ |
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.name = "alix:2", |
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.default_trigger = "default-off", |
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}, |
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{ |
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.name = "alix:3", |
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.default_trigger = "default-off", |
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}, |
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}; |
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static struct gpio_led_platform_data alix_leds_data = { |
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.num_leds = ARRAY_SIZE(alix_leds), |
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.leds = alix_leds, |
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}; |
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static struct gpiod_lookup_table alix_leds_gpio_table = { |
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.dev_id = "leds-gpio", |
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.table = { |
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/* The Geode GPIOs should be on the CS5535 companion chip */ |
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GPIO_LOOKUP_IDX("cs5535-gpio", 6, NULL, 0, GPIO_ACTIVE_LOW), |
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GPIO_LOOKUP_IDX("cs5535-gpio", 25, NULL, 1, GPIO_ACTIVE_LOW), |
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GPIO_LOOKUP_IDX("cs5535-gpio", 27, NULL, 2, GPIO_ACTIVE_LOW), |
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{ } |
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}, |
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}; |
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static struct platform_device alix_leds_dev = { |
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.name = "leds-gpio", |
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.id = -1, |
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.dev.platform_data = &alix_leds_data, |
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}; |
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static struct platform_device *alix_devs[] __initdata = { |
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&alix_buttons_dev, |
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&alix_leds_dev, |
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}; |
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static void __init register_alix(void) |
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{ |
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/* Setup LED control through leds-gpio driver */ |
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gpiod_add_lookup_table(&alix_leds_gpio_table); |
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platform_add_devices(alix_devs, ARRAY_SIZE(alix_devs)); |
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} |
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static bool __init alix_present(unsigned long bios_phys, |
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const char *alix_sig, |
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size_t alix_sig_len) |
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{ |
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const size_t bios_len = BIOS_REGION_SIZE; |
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const char *bios_virt; |
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const char *scan_end; |
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const char *p; |
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char name[64]; |
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if (force) { |
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printk(KERN_NOTICE "%s: forced to skip BIOS test, " |
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"assume system is ALIX.2/ALIX.3\n", |
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KBUILD_MODNAME); |
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return true; |
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} |
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bios_virt = phys_to_virt(bios_phys); |
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scan_end = bios_virt + bios_len - (alix_sig_len + 2); |
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for (p = bios_virt; p < scan_end; p++) { |
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const char *tail; |
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char *a; |
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if (memcmp(p, alix_sig, alix_sig_len) != 0) |
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continue; |
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memcpy(name, p, sizeof(name)); |
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/* remove the first \0 character from string */ |
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a = strchr(name, '\0'); |
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if (a) |
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*a = ' '; |
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/* cut the string at a newline */ |
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a = strchr(name, '\r'); |
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if (a) |
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*a = '\0'; |
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tail = p + alix_sig_len; |
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if ((tail[0] == '2' || tail[0] == '3' || tail[0] == '6')) { |
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printk(KERN_INFO |
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"%s: system is recognized as \"%s\"\n", |
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KBUILD_MODNAME, name); |
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return true; |
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} |
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} |
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return false; |
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} |
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static bool __init alix_present_dmi(void) |
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{ |
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const char *vendor, *product; |
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vendor = dmi_get_system_info(DMI_SYS_VENDOR); |
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if (!vendor || strcmp(vendor, "PC Engines")) |
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return false; |
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product = dmi_get_system_info(DMI_PRODUCT_NAME); |
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if (!product || (strcmp(product, "ALIX.2D") && strcmp(product, "ALIX.6"))) |
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return false; |
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printk(KERN_INFO "%s: system is recognized as \"%s %s\"\n", |
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KBUILD_MODNAME, vendor, product); |
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return true; |
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} |
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static int __init alix_init(void) |
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{ |
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const char tinybios_sig[] = "PC Engines ALIX."; |
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const char coreboot_sig[] = "PC Engines\0ALIX."; |
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if (!is_geode()) |
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return 0; |
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if (alix_present(BIOS_SIGNATURE_TINYBIOS, tinybios_sig, sizeof(tinybios_sig) - 1) || |
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alix_present(BIOS_SIGNATURE_COREBOOT, coreboot_sig, sizeof(coreboot_sig) - 1) || |
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alix_present_dmi()) |
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register_alix(); |
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return 0; |
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} |
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device_initcall(alix_init);
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