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x86/geode/alix2: Supplement driver to include GPIO button support

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GPIO 24 is used in reference designs as a soft-reset button, and
the alix2 is no exception.  Add it as a gpio-button.

Use symbolic values to describe BIOS addresses.

Record the model number.

Signed-off-by: Philip A. Prindeville <philipp@redfish-solutions.com>
Acked-by: Ed Wildgoose <kernel@wildgooses.com>
Acked-by: Andres Salomon <dilinger@queued.net>
Cc: Matthew Garrett <mjg@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Link: http://lkml.kernel.org/n/tip-sjp6k1rjksitx1pej0c0qxd1@git.kernel.org
[ tidied up the code a bit ]
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Philip Prindeville 2012-03-05 15:05:14 -08:00 committed by Ingo Molnar
parent 8bee7cea6c
commit 373913b568
1 changed files with 67 additions and 9 deletions
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76
arch/x86/platform/geode/alix.c
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@ -6,6 +6,7 @@
*
* 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>
@ -24,14 +25,47 @@
#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
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",
@ -64,17 +98,22 @@ static struct platform_device alix_leds_dev = {
.dev.platform_data = &alix_leds_data,
};
static struct __initdata platform_device *alix_devs[] = {
&alix_buttons_dev,
&alix_leds_dev,
};
static void __init register_alix(void)
{
/* Setup LED control through leds-gpio driver */
platform_device_register(&alix_leds_dev);
platform_add_devices(alix_devs, ARRAY_SIZE(alix_devs));
}
static int __init alix_present(unsigned long bios_phys,
static bool __init alix_present(unsigned long bios_phys,
const char *alix_sig,
size_t alix_sig_len)
{
const size_t bios_len = 0x00010000;
const size_t bios_len = BIOS_REGION_SIZE;
const char *bios_virt;
const char *scan_end;
const char *p;
@ -84,7 +123,7 @@ static int __init alix_present(unsigned long bios_phys,
printk(KERN_NOTICE "%s: forced to skip BIOS test, "
"assume system is ALIX.2/ALIX.3\n",
KBUILD_MODNAME);
return 1;
return true;
}
bios_virt = phys_to_virt(bios_phys);
@ -109,15 +148,33 @@ static int __init alix_present(unsigned long bios_phys,
*a = '\0';
tail = p + alix_sig_len;
if ((tail[0] == '2' || tail[0] == '3')) {
if ((tail[0] == '2' || tail[0] == '3' || tail[0] == '6')) {
printk(KERN_INFO
"%s: system is recognized as \"%s\"\n",
KBUILD_MODNAME, name);
return 1;
return true;
}
}
return 0;
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)
@ -128,8 +185,9 @@ static int __init alix_init(void)
if (!is_geode())
return 0;
if (alix_present(0xf0000, tinybios_sig, sizeof(tinybios_sig) - 1) ||
alix_present(0x500, coreboot_sig, sizeof(coreboot_sig) - 1))
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;