From: "Philip A. Prindeville" <philipp@xxxxxxxxxxxxxxxxxxxxx>
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.
Redux: address Andres' review comments; make the model number exported;
add support for DMI detection of the board and manufacturer; change
detection return type to bool; add comment explaining that the model
number is used by downstream drivers to detect if we have RFKILL GPIO
line to mini-PCIe slots (alix 6 only).
Signed-off-by: Philip A. Prindeville <philipp@xxxxxxxxxxxxxxxxxxxxx>
Acked-by: Ed Wildgoose <kernel@xxxxxxxxxxxxxx>
Cc: Andres Salomon <dilinger@xxxxxxxxxx>
---
arch/x86/platform/geode/alix.c | 80 +++++++++++++++++++++++++++++++++++++--
1 files changed, 75 insertions(+), 5 deletions(-)
diff --git a/arch/x86/platform/geode/alix.c b/arch/x86/platform/geode/alix.c
index dc5f1d3..cb97c13 100644
--- a/arch/x86/platform/geode/alix.c
+++ b/arch/x86/platform/geode/alix.c
@@ -6,6 +6,7 @@
*
* Copyright (C) 2008 Constantin Baranov <const@xxxxxxxx>
* Copyright (C) 2011 Ed Wildgoose <kernel@xxxxxxxxxxxxxx>
+ * and Philip Prindeville <philipp@xxxxxxxxxxxxxxxxxxxxx>
*
* TODO: There are large similarities with leds-net5501.c
* by Alessandro Zummo <a.zummo@xxxxxxxxxxxx>
@@ -24,14 +25,55 @@
#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
+
+/*
+ * the 6F2 has an RFKILL GPIO line to the mini-PCIe slots that isn't
+ * present on other Alix boards. Wifi drivers can use this symbol to
+ * detect if it's available.
+ */
+int alix_model;
+EXPORT_SYMBOL(alix_model);
+
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 +106,22 @@ 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,
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;
@@ -109,7 +156,9 @@ 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')) {
+ alix_model = tail[0] - '0';
+
printk(KERN_INFO
"%s: system is recognized as \"%s\"\n",
KBUILD_MODNAME, name);
@@ -120,6 +169,26 @@ static int __init alix_present(unsigned long bios_phys,
return 0;
}
+static bool __init alix_present_dmi(void)
+{
+ 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;
+
+ alix_model = product[5] - '0';
+
+ 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.";
@@ -128,8 +197,9 @@ 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;
--
1.7.7.5
--
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