geos: Platform driver for Geos and Geos2 single-board computers.

Trivial platform driver for Traverse Technologies Geos and Geos2
single-board computers. Uses SMBIOS to identify platform.
Based on progressive revisions of the leds-net5501 driver that
was rewritten by Ed Wildgoose as a platform driver.

Supports GPIO-based LEDs (3) and 1 polled button which is
typically used for a soft reset.

Signed-off-by: Philip Prindeville <philipp@redfish-solutions.com>
Reviewed-by: Ed Wildgoose <ed@wildgooses.com>
Acked-by: Andres Salomon <dilinger@queued.net>
Cc: Richard Purdie <rpurdie@rpsys.net>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Matthew Garrett <mjg@redhat.com>

2 files changed, 129 insertions, 0 deletions

diff --git a/arch/x86/platform/geode/Makefile b/arch/x86/platform/geode/Makefile
index 07c9cd05021a..d8ba5644f2f6 100644
--- a/arch/x86/platform/geode/Makefile
+++ b/arch/x86/platform/geode/Makefile
@@ -1 +1,2 @@
 obj-$(CONFIG_ALIX)              += alix.o
+obj-$(CONFIG_GEOS)              += geos.o
diff --git a/arch/x86/platform/geode/geos.c b/arch/x86/platform/geode/geos.c
new file mode 100644
index 000000000000..c2e6d53558be
--- /dev/null
+++ b/arch/x86/platform/geode/geos.c
@@ -0,0 +1,128 @@
+/*
+ * System Specific setup for Traverse Technologies GEOS.
+ * At the moment this means setup of GPIO control of LEDs.
+ *
+ * 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
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/string.h>
+#include <linux/module.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>
+
+static struct gpio_keys_button geos_gpio_buttons[] = {
+        {
+                .code = KEY_RESTART,
+                .gpio = 3,
+                .active_low = 1,
+                .desc = "Reset button",
+                .type = EV_KEY,
+                .wakeup = 0,
+                .debounce_interval = 100,
+                .can_disable = 0,
+        }
+};
+static struct gpio_keys_platform_data geos_buttons_data = {
+        .buttons = geos_gpio_buttons,
+        .nbuttons = ARRAY_SIZE(geos_gpio_buttons),
+        .poll_interval = 20,
+};
+
+static struct platform_device geos_buttons_dev = {
+        .name = "gpio-keys-polled",
+        .id = 1,
+        .dev = {
+                .platform_data = &geos_buttons_data,
+        }
+};
+
+static struct gpio_led geos_leds[] = {
+        {
+                .name = "geos:1",
+                .gpio = 6,
+                .default_trigger = "default-on",
+                .active_low = 1,
+        },
+        {
+                .name = "geos:2",
+                .gpio = 25,
+                .default_trigger = "default-off",
+                .active_low = 1,
+        },
+        {
+                .name = "geos:3",
+                .gpio = 27,
+                .default_trigger = "default-off",
+                .active_low = 1,
+        },
+};
+
+static struct gpio_led_platform_data geos_leds_data = {
+        .num_leds = ARRAY_SIZE(geos_leds),
+        .leds = geos_leds,
+};
+
+static struct platform_device geos_leds_dev = {
+        .name = "leds-gpio",
+        .id = -1,
+        .dev.platform_data = &geos_leds_data,
+};
+
+static struct __initdata platform_device *geos_devs[] = {
+        &geos_buttons_dev,
+        &geos_leds_dev,
+};
+
+static void __init register_geos(void)
+{
+        /* Setup LED control through leds-gpio driver */
+        platform_add_devices(geos_devs, ARRAY_SIZE(geos_devs));
+}
+
+static int __init geos_init(void)
+{
+        const char *vendor, *product;
+
+        if (!is_geode())
+                return 0;
+
+        vendor = dmi_get_system_info(DMI_SYS_VENDOR);
+        if (!vendor || strcmp(vendor, "Traverse Technologies"))
+                return 0;
+
+        product = dmi_get_system_info(DMI_PRODUCT_NAME);
+        if (!product || strcmp(product, "Geos"))
+                return 0;
+
+        printk(KERN_INFO "%s: system is recognized as \"%s %s\"\n",
+               KBUILD_MODNAME, vendor, product);
+
+        register_geos();
+
+        return 0;
+}
+
+module_init(geos_init);
+
+MODULE_AUTHOR("Philip Prindeville <philipp@redfish-solutions.com>");
+MODULE_DESCRIPTION("Traverse Technologies Geos System Setup");
+MODULE_LICENSE("GPL");