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// 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/gpio.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);
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