3 files changed, 275 insertions, 0 deletions

diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index 77c6097ced80..48315621046d 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -396,6 +396,15 @@ config ACPI_ASUS
           NOTE: This driver is deprecated and will probably be removed soon,
           use asus-laptop instead.
 
+config TOPSTAR_LAPTOP
+        tristate "Topstar Laptop Extras"
+        depends on ACPI
+        depends on INPUT
+        ---help---
+          This driver adds support for hotkeys found on Topstar laptops.
+
+          If you have a Topstar laptop, say Y or M here.
+
 config ACPI_TOSHIBA
         tristate "Toshiba Laptop Extras"
         depends on ACPI
diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile
index 641b8bfa5538..d1c16210a512 100644
--- a/drivers/platform/x86/Makefile
+++ b/drivers/platform/x86/Makefile
@@ -19,4 +19,5 @@ obj-$(CONFIG_PANASONIC_LAPTOP)	+= panasonic-laptop.o
 obj-$(CONFIG_INTEL_MENLOW)      += intel_menlow.o
 obj-$(CONFIG_ACPI_WMI)          += wmi.o
 obj-$(CONFIG_ACPI_ASUS)         += asus_acpi.o
+obj-$(CONFIG_TOPSTAR_LAPTOP)    += topstar-laptop.o
 obj-$(CONFIG_ACPI_TOSHIBA)      += toshiba_acpi.o
diff --git a/drivers/platform/x86/topstar-laptop.c b/drivers/platform/x86/topstar-laptop.c
new file mode 100644
index 000000000000..02f3d4e9e666
--- /dev/null
+++ b/drivers/platform/x86/topstar-laptop.c
@@ -0,0 +1,265 @@
+/*
+ * ACPI driver for Topstar notebooks (hotkeys support only)
+ *
+ * Copyright (c) 2009 Herton Ronaldo Krzesinski <herton@mandriva.com.br>
+ *
+ * Implementation inspired by existing x86 platform drivers, in special
+ * asus/eepc/fujitsu-laptop, thanks to their authors
+ *
+ * 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.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/acpi.h>
+#include <linux/input.h>
+
+#define ACPI_TOPSTAR_CLASS "topstar"
+
+struct topstar_hkey {
+        struct input_dev *inputdev;
+};
+
+struct tps_key_entry {
+        u8 code;
+        u16 keycode;
+};
+
+static struct tps_key_entry topstar_keymap[] = {
+        { 0x80, KEY_BRIGHTNESSUP },
+        { 0x81, KEY_BRIGHTNESSDOWN },
+        { 0x83, KEY_VOLUMEUP },
+        { 0x84, KEY_VOLUMEDOWN },
+        { 0x85, KEY_MUTE },
+        { 0x86, KEY_SWITCHVIDEOMODE },
+        { 0x87, KEY_F13 }, /* touchpad enable/disable key */
+        { 0x88, KEY_WLAN },
+        { 0x8a, KEY_WWW },
+        { 0x8b, KEY_MAIL },
+        { 0x8c, KEY_MEDIA },
+        { 0x96, KEY_F14 }, /* G key? */
+        { }
+};
+
+static struct tps_key_entry *tps_get_key_by_scancode(int code)
+{
+        struct tps_key_entry *key;
+
+        for (key = topstar_keymap; key->code; key++)
+                if (code == key->code)
+                        return key;
+
+        return NULL;
+}
+
+static struct tps_key_entry *tps_get_key_by_keycode(int code)
+{
+        struct tps_key_entry *key;
+
+        for (key = topstar_keymap; key->code; key++)
+                if (code == key->keycode)
+                        return key;
+
+        return NULL;
+}
+
+static void acpi_topstar_notify(struct acpi_device *device, u32 event)
+{
+        struct tps_key_entry *key;
+        static bool dup_evnt[2];
+        bool *dup;
+        struct topstar_hkey *hkey = acpi_driver_data(device);
+
+        /* 0x83 and 0x84 key events comes duplicated... */
+        if (event == 0x83 || event == 0x84) {
+                dup = &dup_evnt[event - 0x83];
+                if (*dup) {
+                        *dup = false;
+                        return;
+                }
+                *dup = true;
+        }
+
+        /*
+         * 'G key' generate two event codes, convert to only
+         * one event/key code for now (3G switch?)
+         */
+        if (event == 0x97)
+                event = 0x96;
+
+        key = tps_get_key_by_scancode(event);
+        if (key) {
+                input_report_key(hkey->inputdev, key->keycode, 1);
+                input_sync(hkey->inputdev);
+                input_report_key(hkey->inputdev, key->keycode, 0);
+                input_sync(hkey->inputdev);
+                return;
+        }
+
+        /* Known non hotkey events don't handled or that we don't care yet */
+        if (event == 0x8e || event == 0x8f || event == 0x90)
+                return;
+
+        pr_info("unknown event = 0x%02x\n", event);
+}
+
+static int acpi_topstar_fncx_switch(struct acpi_device *device, bool state)
+{
+        acpi_status status;
+        union acpi_object fncx_params[1] = {
+                { .type = ACPI_TYPE_INTEGER }
+        };
+        struct acpi_object_list fncx_arg_list = { 1, &fncx_params[0] };
+
+        fncx_params[0].integer.value = state ? 0x86 : 0x87;
+        status = acpi_evaluate_object(device->handle, "FNCX", &fncx_arg_list, NULL);
+        if (ACPI_FAILURE(status)) {
+                pr_err("Unable to switch FNCX notifications\n");
+                return -ENODEV;
+        }
+
+        return 0;
+}
+
+static int topstar_getkeycode(struct input_dev *dev, int scancode, int *keycode)
+{
+        struct tps_key_entry *key = tps_get_key_by_scancode(scancode);
+
+        if (!key)
+                return -EINVAL;
+
+        *keycode = key->keycode;
+        return 0;
+}
+
+static int topstar_setkeycode(struct input_dev *dev, int scancode, int keycode)
+{
+        struct tps_key_entry *key;
+        int old_keycode;
+
+        if (keycode < 0 || keycode > KEY_MAX)
+                return -EINVAL;
+
+        key = tps_get_key_by_scancode(scancode);
+
+        if (!key)
+                return -EINVAL;
+
+        old_keycode = key->keycode;
+        key->keycode = keycode;
+        set_bit(keycode, dev->keybit);
+        if (!tps_get_key_by_keycode(old_keycode))
+                clear_bit(old_keycode, dev->keybit);
+        return 0;
+}
+
+static int acpi_topstar_init_hkey(struct topstar_hkey *hkey)
+{
+        struct tps_key_entry *key;
+
+        hkey->inputdev = input_allocate_device();
+        if (!hkey->inputdev) {
+                pr_err("Unable to allocate input device\n");
+                return -ENODEV;
+        }
+        hkey->inputdev->name = "Topstar Laptop extra buttons";
+        hkey->inputdev->phys = "topstar/input0";
+        hkey->inputdev->id.bustype = BUS_HOST;
+        hkey->inputdev->getkeycode = topstar_getkeycode;
+        hkey->inputdev->setkeycode = topstar_setkeycode;
+        for (key = topstar_keymap; key->code; key++) {
+                set_bit(EV_KEY, hkey->inputdev->evbit);
+                set_bit(key->keycode, hkey->inputdev->keybit);
+        }
+        if (input_register_device(hkey->inputdev)) {
+                pr_err("Unable to register input device\n");
+                input_free_device(hkey->inputdev);
+                return -ENODEV;
+        }
+
+        return 0;
+}
+
+static int acpi_topstar_add(struct acpi_device *device)
+{
+        struct topstar_hkey *tps_hkey;
+
+        tps_hkey = kzalloc(sizeof(struct topstar_hkey), GFP_KERNEL);
+        if (!tps_hkey)
+                return -ENOMEM;
+
+        strcpy(acpi_device_name(device), "Topstar TPSACPI");
+        strcpy(acpi_device_class(device), ACPI_TOPSTAR_CLASS);
+
+        if (acpi_topstar_fncx_switch(device, true))
+                goto add_err;
+
+        if (acpi_topstar_init_hkey(tps_hkey))
+                goto add_err;
+
+        device->driver_data = tps_hkey;
+        return 0;
+
+add_err:
+        kfree(tps_hkey);
+        return -ENODEV;
+}
+
+static int acpi_topstar_remove(struct acpi_device *device, int type)
+{
+        struct topstar_hkey *tps_hkey = acpi_driver_data(device);
+
+        acpi_topstar_fncx_switch(device, false);
+
+        input_unregister_device(tps_hkey->inputdev);
+        kfree(tps_hkey);
+
+        return 0;
+}
+
+static const struct acpi_device_id topstar_device_ids[] = {
+        { "TPSACPI01", 0 },
+        { "", 0 },
+};
+MODULE_DEVICE_TABLE(acpi, topstar_device_ids);
+
+static struct acpi_driver acpi_topstar_driver = {
+        .name = "Topstar laptop ACPI driver",
+        .class = ACPI_TOPSTAR_CLASS,
+        .ids = topstar_device_ids,
+        .ops = {
+                .add = acpi_topstar_add,
+                .remove = acpi_topstar_remove,
+                .notify = acpi_topstar_notify,
+        },
+};
+
+static int __init topstar_laptop_init(void)
+{
+        int ret;
+
+        ret = acpi_bus_register_driver(&acpi_topstar_driver);
+        if (ret < 0)
+                return ret;
+
+        printk(KERN_INFO "Topstar Laptop ACPI extras driver loaded\n");
+
+        return 0;
+}
+
+static void __exit topstar_laptop_exit(void)
+{
+        acpi_bus_unregister_driver(&acpi_topstar_driver);
+}
+
+module_init(topstar_laptop_init);
+module_exit(topstar_laptop_exit);
+
+MODULE_AUTHOR("Herton Ronaldo Krzesinski");
+MODULE_DESCRIPTION("Topstar Laptop ACPI Extras driver");
+MODULE_LICENSE("GPL");