[ACPI] generic Hot Key support

See Documentation/acpi-hotkey.txt

Use cmdline "acpi_specific_hotkey" to enable
legacy platform specific drivers.

http://bugzilla.kernel.org/show_bug.cgi?id=3887

Signed-off-by: Luming Yu <luming.yu@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 1018 insertions, 0 deletions

diff --git a/drivers/acpi/hotkey.c b/drivers/acpi/hotkey.c
new file mode 100644
index 000000000000..0aef9fc449c5
--- /dev/null
+++ b/drivers/acpi/hotkey.c
@@ -0,0 +1,1018 @@
+/* 
+ *  hotkey.c - ACPI Hotkey Driver ($Revision:$)
+ *
+ *  Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or (at
+ *  your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but
+ *  WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ */
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/proc_fs.h>
+#include <linux/sched.h>
+#include <linux/kmod.h>
+#include <linux/seq_file.h>
+#include <acpi/acpi_drivers.h>
+#include <acpi/acpi_bus.h>
+#include <asm/uaccess.h>
+
+#define HOTKEY_ACPI_VERSION "0.1"
+
+#define HOTKEY_PROC "hotkey"
+#define HOTKEY_EV_CONFIG    "event_config"
+#define HOTKEY_PL_CONFIG    "poll_config"
+#define HOTKEY_ACTION   "action"
+#define HOTKEY_INFO "info"
+
+#define ACPI_HOTK_NAME          "Generic Hotkey Driver"
+#define ACPI_HOTK_CLASS         "Hotkey"
+#define ACPI_HOTK_DEVICE_NAME   "Hotkey"
+#define ACPI_HOTK_HID           "Unknown?"
+#define ACPI_HOTKEY_COMPONENT   0x20000000
+
+#define ACPI_HOTKEY_EVENT   0x1
+#define ACPI_HOTKEY_POLLING 0x2
+#define ACPI_UNDEFINED_EVENT    0xf
+
+#define MAX_CONFIG_RECORD_LEN   80
+#define MAX_NAME_PATH_LEN   80
+#define MAX_CALL_PARM       80
+
+#define IS_EVENT(e)       0xff  /* ((e) & 0x40000000)  */
+#define IS_POLL(e)      0xff    /* (~((e) & 0x40000000))  */
+
+#define _COMPONENT              ACPI_HOTKEY_COMPONENT
+ACPI_MODULE_NAME("acpi_hotkey")
+
+    MODULE_AUTHOR("luming.yu@intel.com");
+MODULE_DESCRIPTION(ACPI_HOTK_NAME);
+MODULE_LICENSE("GPL");
+
+/*  standardized internal hotkey number/event  */
+enum {
+        /* Video Extension event */
+        HK_EVENT_CYCLE_OUTPUT_DEVICE = 0x80,
+        HK_EVENT_OUTPUT_DEVICE_STATUS_CHANGE,
+        HK_EVENT_CYCLE_DISPLAY_OUTPUT,
+        HK_EVENT_NEXT_DISPLAY_OUTPUT,
+        HK_EVENT_PREVIOUS_DISPLAY_OUTPUT,
+        HK_EVENT_CYCLE_BRIGHTNESS,
+        HK_EVENT_INCREASE_BRIGHTNESS,
+        HK_EVENT_DECREASE_BRIGHTNESS,
+        HK_EVENT_ZERO_BRIGHTNESS,
+        HK_EVENT_DISPLAY_DEVICE_OFF,
+
+        /* Snd Card event */
+        HK_EVENT_VOLUME_MUTE,
+        HK_EVENT_VOLUME_INCLREASE,
+        HK_EVENT_VOLUME_DECREASE,
+
+        /* running state control */
+        HK_EVENT_ENTERRING_S3,
+        HK_EVENT_ENTERRING_S4,
+        HK_EVENT_ENTERRING_S5,
+};
+
+/*  procdir we use */
+static struct proc_dir_entry *hotkey_proc_dir;
+static struct proc_dir_entry *hotkey_config;
+static struct proc_dir_entry *hotkey_poll_config;
+static struct proc_dir_entry *hotkey_action;
+static struct proc_dir_entry *hotkey_info;
+
+/* linkage for all type of hotkey */
+struct acpi_hotkey_link {
+        struct list_head entries;
+        int hotkey_type;        /* event or polling based hotkey  */
+        int hotkey_standard_num;        /* standardized hotkey(event) number */
+};
+
+/* event based hotkey */
+struct acpi_event_hotkey {
+        struct acpi_hotkey_link hotkey_link;
+        int flag;
+        acpi_handle bus_handle; /* bus to install notify handler */
+        int external_hotkey_num;        /* external hotkey/event number */
+        acpi_handle action_handle;      /* acpi handle attached aml action method */
+        char *action_method;    /* action method */
+};
+
+/* 
+ * There are two ways to poll status
+ * 1. directy call read_xxx method, without any arguments passed in
+ * 2. call write_xxx method, with arguments passed in, you need
+ * the result is saved in acpi_polling_hotkey.poll_result.
+ * anthoer read command through polling interface.
+ *
+ */
+
+/* polling based hotkey */
+struct acpi_polling_hotkey {
+        struct acpi_hotkey_link hotkey_link;
+        int flag;
+        acpi_handle poll_handle;        /* acpi handle attached polling method */
+        char *poll_method;      /* poll method */
+        acpi_handle action_handle;      /* acpi handle attached action method */
+        char *action_method;    /* action method */
+        void *poll_result;      /* polling_result */
+        struct proc_dir_entry *proc;
+};
+
+/* hotkey object union */
+union acpi_hotkey {
+        struct list_head entries;
+        struct acpi_hotkey_link link;
+        struct acpi_event_hotkey event_hotkey;
+        struct acpi_polling_hotkey poll_hotkey;
+};
+
+/* hotkey object list */
+struct acpi_hotkey_list {
+        struct list_head *entries;
+        int count;
+};
+
+static int auto_hotkey_add(struct acpi_device *device);
+static int auto_hotkey_remove(struct acpi_device *device, int type);
+
+static struct acpi_driver hotkey_driver = {
+        .name = ACPI_HOTK_NAME,
+        .class = ACPI_HOTK_CLASS,
+        .ids = ACPI_HOTK_HID,
+        .ops = {
+                .add = auto_hotkey_add,
+                .remove = auto_hotkey_remove,
+                },
+};
+
+static int hotkey_open_config(struct inode *inode, struct file *file);
+static ssize_t hotkey_write_config(struct file *file,
+                                   const char __user * buffer,
+                                   size_t count, loff_t * data);
+static ssize_t hotkey_write_poll_config(struct file *file,
+                                        const char __user * buffer,
+                                        size_t count, loff_t * data);
+static int hotkey_info_open_fs(struct inode *inode, struct file *file);
+static int hotkey_action_open_fs(struct inode *inode, struct file *file);
+static ssize_t hotkey_execute_aml_method(struct file *file,
+                                         const char __user * buffer,
+                                         size_t count, loff_t * data);
+static int hotkey_config_seq_show(struct seq_file *seq, void *offset);
+static int hotkey_polling_open_fs(struct inode *inode, struct file *file);
+
+/* event based config */
+static struct file_operations hotkey_config_fops = {
+        .open = hotkey_open_config,
+        .read = seq_read,
+        .write = hotkey_write_config,
+        .llseek = seq_lseek,
+        .release = single_release,
+};
+
+/* polling based config */
+static struct file_operations hotkey_poll_config_fops = {
+        .open = hotkey_open_config,
+        .read = seq_read,
+        .write = hotkey_write_poll_config,
+        .llseek = seq_lseek,
+        .release = single_release,
+};
+
+/* hotkey driver info */
+static struct file_operations hotkey_info_fops = {
+        .open = hotkey_info_open_fs,
+        .read = seq_read,
+        .llseek = seq_lseek,
+        .release = single_release,
+};
+
+/* action */
+static struct file_operations hotkey_action_fops = {
+        .open = hotkey_action_open_fs,
+        .read = seq_read,
+        .write = hotkey_execute_aml_method,
+        .llseek = seq_lseek,
+        .release = single_release,
+};
+
+/* polling results */
+static struct file_operations hotkey_polling_fops = {
+        .open = hotkey_polling_open_fs,
+        .read = seq_read,
+        .llseek = seq_lseek,
+        .release = single_release,
+};
+
+struct acpi_hotkey_list global_hotkey_list;     /* link all ev or pl hotkey  */
+struct list_head hotkey_entries;        /* head of the list of hotkey_list */
+
+static int hotkey_info_seq_show(struct seq_file *seq, void *offset)
+{
+        ACPI_FUNCTION_TRACE("hotkey_info_seq_show");
+
+        seq_printf(seq, "Hotkey generic driver ver: %s", HOTKEY_ACPI_VERSION);
+
+        return_VALUE(0);
+}
+
+static int hotkey_info_open_fs(struct inode *inode, struct file *file)
+{
+        return single_open(file, hotkey_info_seq_show, PDE(inode)->data);
+}
+
+static char *format_result(union acpi_object *object)
+{
+        char *buf = (char *)kmalloc(sizeof(union acpi_object), GFP_KERNEL);
+
+        memset(buf, 0, sizeof(union acpi_object));
+
+        /* Now, just support integer type */
+        if (object->type == ACPI_TYPE_INTEGER)
+                sprintf(buf, "%d", (u32) object->integer.value);
+
+        return buf;
+}
+
+static int hotkey_polling_seq_show(struct seq_file *seq, void *offset)
+{
+        struct acpi_polling_hotkey *poll_hotkey =
+            (struct acpi_polling_hotkey *)seq->private;
+
+        ACPI_FUNCTION_TRACE("hotkey_polling_seq_show");
+
+        if (poll_hotkey->poll_result)
+                seq_printf(seq, "%s", format_result(poll_hotkey->poll_result));
+
+        return_VALUE(0);
+}
+
+static int hotkey_polling_open_fs(struct inode *inode, struct file *file)
+{
+        return single_open(file, hotkey_polling_seq_show, PDE(inode)->data);
+}
+
+static int hotkey_action_open_fs(struct inode *inode, struct file *file)
+{
+        return single_open(file, hotkey_info_seq_show, PDE(inode)->data);
+}
+
+/* Mapping external hotkey number to standardized hotkey event num */
+static int hotkey_get_internal_event(int event, struct acpi_hotkey_list *list)
+{
+        struct list_head *entries, *next;
+        int val = 0;
+
+        ACPI_FUNCTION_TRACE("hotkey_get_internal_event");
+
+        list_for_each_safe(entries, next, list->entries) {
+                union acpi_hotkey *key =
+                    container_of(entries, union acpi_hotkey, entries);
+                if (key->link.hotkey_type == ACPI_HOTKEY_EVENT
+                    && key->event_hotkey.external_hotkey_num == event)
+                        val = key->link.hotkey_standard_num;
+                else
+                        val = -1;
+        }
+
+        return_VALUE(val);
+}
+
+static void
+acpi_hotkey_notify_handler(acpi_handle handle, u32 event, void *data)
+{
+        struct acpi_device *device = NULL;
+        u32 internal_event;
+
+        ACPI_FUNCTION_TRACE("acpi_hotkey_notify_handler");
+
+        if (acpi_bus_get_device(handle, &device))
+                return_VOID;
+
+        internal_event = hotkey_get_internal_event(event, &global_hotkey_list);
+        acpi_bus_generate_event(device, event, 0);
+
+        return_VOID;
+}
+
+/* Need to invent automatically hotkey add method */
+static int auto_hotkey_add(struct acpi_device *device)
+{
+        /* Implement me */
+        return 0;
+}
+
+/* Need to invent automatically hotkey remove method */
+static int auto_hotkey_remove(struct acpi_device *device, int type)
+{
+        /* Implement me */
+        return 0;
+}
+
+/* Create a proc file for each polling method */
+static int create_polling_proc(union acpi_hotkey *device)
+{
+        struct proc_dir_entry *proc;
+
+        ACPI_FUNCTION_TRACE("create_polling_proc");
+        mode_t mode = S_IFREG | S_IRUGO | S_IWUGO;
+
+        proc = create_proc_entry(device->poll_hotkey.action_method,
+                                 mode, hotkey_proc_dir);
+
+        if (!proc) {
+                ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+                                  "Hotkey: Unable to create %s entry\n",
+                                  device->poll_hotkey.poll_method));
+                return_VALUE(-ENODEV);
+        } else {
+                proc->proc_fops = &hotkey_polling_fops;
+                proc->owner = THIS_MODULE;
+                proc->data = device;
+                proc->uid = 0;
+                proc->gid = 0;
+                device->poll_hotkey.proc = proc;
+        }
+        return_VALUE(0);
+}
+
+static int is_valid_acpi_path(const char *pathname)
+{
+        acpi_handle handle;
+        acpi_status status;
+        ACPI_FUNCTION_TRACE("is_valid_acpi_path");
+
+        status = acpi_get_handle(NULL, (char *)pathname, &handle);
+        return_VALUE(!ACPI_FAILURE(status));
+}
+
+static int is_valid_hotkey(union acpi_hotkey *device)
+{
+        ACPI_FUNCTION_TRACE("is_valid_hotkey");
+        /* Implement valid check */
+        return_VALUE(1);
+}
+
+static int hotkey_add(union acpi_hotkey *device)
+{
+        int status = 0;
+        struct acpi_device *dev = NULL;
+
+        ACPI_FUNCTION_TRACE("hotkey_add");
+
+        if (device->link.hotkey_type == ACPI_HOTKEY_EVENT) {
+                status =
+                    acpi_bus_get_device(device->event_hotkey.bus_handle, &dev);
+                if (status)
+                        return_VALUE(status);
+
+                status = acpi_install_notify_handler(dev->handle,
+                                                     ACPI_SYSTEM_NOTIFY,
+                                                     acpi_hotkey_notify_handler,
+                                                     device);
+        } else                  /* Add polling hotkey */
+                create_polling_proc(device);
+
+        global_hotkey_list.count++;
+
+        list_add_tail(&device->link.entries, global_hotkey_list.entries);
+
+        return_VALUE(status);
+}
+
+static int hotkey_remove(union acpi_hotkey *device)
+{
+        struct list_head *entries, *next;
+
+        ACPI_FUNCTION_TRACE("hotkey_remove");
+
+        list_for_each_safe(entries, next, global_hotkey_list.entries) {
+                union acpi_hotkey *key =
+                    container_of(entries, union acpi_hotkey, entries);
+                if (key->link.hotkey_standard_num ==
+                    device->link.hotkey_standard_num) {
+                        list_del(&key->link.entries);
+                        remove_proc_entry(key->poll_hotkey.action_method,
+                                          hotkey_proc_dir);
+                        global_hotkey_list.count--;
+                        break;
+                }
+        }
+        return_VALUE(0);
+}
+
+static void hotkey_update(union acpi_hotkey *key)
+{
+        struct list_head *entries, *next;
+
+        ACPI_FUNCTION_TRACE("hotkey_update");
+
+        list_for_each_safe(entries, next, global_hotkey_list.entries) {
+                union acpi_hotkey *key =
+                    container_of(entries, union acpi_hotkey, entries);
+                if (key->link.hotkey_standard_num ==
+                    key->link.hotkey_standard_num) {
+                        key->event_hotkey.bus_handle =
+                            key->event_hotkey.bus_handle;
+                        key->event_hotkey.external_hotkey_num =
+                            key->event_hotkey.external_hotkey_num;
+                        key->event_hotkey.action_handle =
+                            key->event_hotkey.action_handle;
+                        key->event_hotkey.action_method =
+                            key->event_hotkey.action_method;
+                        break;
+                }
+        }
+
+        return_VOID;
+}
+
+static void free_hotkey_device(union acpi_hotkey *key)
+{
+        struct acpi_device *dev;
+        int status;
+
+        ACPI_FUNCTION_TRACE("free_hotkey_device");
+
+        if (key->link.hotkey_type == ACPI_HOTKEY_EVENT) {
+                status =
+                    acpi_bus_get_device(key->event_hotkey.bus_handle, &dev);
+                if (dev->handle)
+                        acpi_remove_notify_handler(dev->handle,
+                                                   ACPI_SYSTEM_NOTIFY,
+                                                   acpi_hotkey_notify_handler);
+        } else
+                remove_proc_entry(key->poll_hotkey.action_method,
+                                  hotkey_proc_dir);
+        kfree(key);
+        return_VOID;
+}
+
+static int
+init_hotkey_device(union acpi_hotkey *key, char *bus_str, char *action_str,
+                   char *method, int std_num, int external_num)
+{
+        ACPI_FUNCTION_TRACE("init_hotkey_device");
+
+        key->link.hotkey_type = ACPI_HOTKEY_EVENT;
+        key->link.hotkey_standard_num = std_num;
+        key->event_hotkey.flag = 0;
+        if (is_valid_acpi_path(bus_str))
+                acpi_get_handle((acpi_handle) 0,
+                                bus_str, &(key->event_hotkey.bus_handle));
+        else
+                return_VALUE(-ENODEV);
+        key->event_hotkey.external_hotkey_num = external_num;
+        if (is_valid_acpi_path(action_str))
+                acpi_get_handle((acpi_handle) 0,
+                                action_str, &(key->event_hotkey.action_handle));
+        key->event_hotkey.action_method = kmalloc(sizeof(method), GFP_KERNEL);
+        strcpy(key->event_hotkey.action_method, method);
+
+        return_VALUE(!is_valid_hotkey(key));
+}
+
+static int
+init_poll_hotkey_device(union acpi_hotkey *key,
+                        char *poll_str,
+                        char *poll_method,
+                        char *action_str, char *action_method, int std_num)
+{
+        ACPI_FUNCTION_TRACE("init_poll_hotkey_device");
+
+        key->link.hotkey_type = ACPI_HOTKEY_POLLING;
+        key->link.hotkey_standard_num = std_num;
+        key->poll_hotkey.flag = 0;
+        if (is_valid_acpi_path(poll_str))
+                acpi_get_handle((acpi_handle) 0,
+                                poll_str, &(key->poll_hotkey.poll_handle));
+        else
+                return_VALUE(-ENODEV);
+        key->poll_hotkey.poll_method = poll_method;
+        if (is_valid_acpi_path(action_str))
+                acpi_get_handle((acpi_handle) 0,
+                                action_str, &(key->poll_hotkey.action_handle));
+        key->poll_hotkey.action_method =
+            kmalloc(sizeof(action_method), GFP_KERNEL);
+        strcpy(key->poll_hotkey.action_method, action_method);
+        key->poll_hotkey.poll_result =
+            (union acpi_object *)kmalloc(sizeof(union acpi_object), GFP_KERNEL);
+        return_VALUE(is_valid_hotkey(key));
+}
+
+static int check_hotkey_valid(union acpi_hotkey *key,
+                              struct acpi_hotkey_list *list)
+{
+        ACPI_FUNCTION_TRACE("check_hotkey_valid");
+        return_VALUE(0);
+}
+
+static int hotkey_open_config(struct inode *inode, struct file *file)
+{
+        ACPI_FUNCTION_TRACE("hotkey_open_config");
+        return_VALUE(single_open
+                     (file, hotkey_config_seq_show, PDE(inode)->data));
+}
+
+static int hotkey_config_seq_show(struct seq_file *seq, void *offset)
+{
+        struct acpi_hotkey_list *hotkey_list = &global_hotkey_list;
+        struct list_head *entries, *next;
+        char bus_name[ACPI_PATHNAME_MAX] = { 0 };
+        char action_name[ACPI_PATHNAME_MAX] = { 0 };
+        struct acpi_buffer bus = { ACPI_PATHNAME_MAX, bus_name };
+        struct acpi_buffer act = { ACPI_PATHNAME_MAX, action_name };
+
+        ACPI_FUNCTION_TRACE(("hotkey_config_seq_show"));
+
+        if (!hotkey_list)
+                goto end;
+
+        list_for_each_safe(entries, next, hotkey_list->entries) {
+                union acpi_hotkey *key =
+                    container_of(entries, union acpi_hotkey, entries);
+                if (key->link.hotkey_type == ACPI_HOTKEY_EVENT) {
+                        acpi_get_name(key->event_hotkey.bus_handle,
+                                      ACPI_NAME_TYPE_MAX, &bus);
+                        acpi_get_name(key->event_hotkey.action_handle,
+                                      ACPI_NAME_TYPE_MAX, &act);
+                        seq_printf(seq, "%s:%s:%s:%d:%d", bus_name,
+                                   action_name,
+                                   key->event_hotkey.action_method,
+                                   key->link.hotkey_standard_num,
+                                   key->event_hotkey.external_hotkey_num);
+                } /* ACPI_HOTKEY_POLLING */
+                else {
+                        acpi_get_name(key->poll_hotkey.poll_handle,
+                                      ACPI_NAME_TYPE_MAX, &bus);
+                        acpi_get_name(key->poll_hotkey.action_handle,
+                                      ACPI_NAME_TYPE_MAX, &act);
+                        seq_printf(seq, "%s:%s:%s:%s:%d", bus_name,
+                                   key->poll_hotkey.poll_method,
+                                   action_name,
+                                   key->poll_hotkey.action_method,
+                                   key->link.hotkey_standard_num);
+                }
+        }
+        seq_puts(seq, "\n");
+      end:
+        return_VALUE(0);
+}
+
+static int
+get_parms(char *config_record,
+          int *cmd,
+          char *bus_handle,
+          char *bus_method,
+          char *action_handle,
+          char *method, int *internal_event_num, int *external_event_num)
+{
+        char *tmp, *tmp1;
+        ACPI_FUNCTION_TRACE(("get_parms"));
+
+        sscanf(config_record, "%d", cmd);
+
+        tmp = strchr(config_record, ':');
+        tmp++;
+        tmp1 = strchr(tmp, ':');
+        strncpy(bus_handle, tmp, tmp1 - tmp);
+        bus_handle[tmp1 - tmp] = 0;
+
+        tmp = tmp1;
+        tmp++;
+        tmp1 = strchr(tmp, ':');
+        strncpy(bus_method, tmp, tmp1 - tmp);
+        bus_method[tmp1 - tmp] = 0;
+
+        tmp = tmp1;
+        tmp++;
+        tmp1 = strchr(tmp, ':');
+        strncpy(action_handle, tmp, tmp1 - tmp);
+        action_handle[tmp1 - tmp] = 0;
+
+        tmp = tmp1;
+        tmp++;
+        tmp1 = strchr(tmp, ':');
+        strncpy(method, tmp, tmp1 - tmp);
+        method[tmp1 - tmp] = 0;
+
+        sscanf(tmp1 + 1, "%d:%d", internal_event_num, external_event_num);
+        return_VALUE(6);
+}
+
+/*  count is length for one input record */
+static ssize_t hotkey_write_config(struct file *file,
+                                   const char __user * buffer,
+                                   size_t count, loff_t * data)
+{
+        struct acpi_hotkey_list *hotkey_list = &global_hotkey_list;
+        char config_record[MAX_CONFIG_RECORD_LEN];
+        char bus_handle[MAX_NAME_PATH_LEN];
+        char bus_method[MAX_NAME_PATH_LEN];
+        char action_handle[MAX_NAME_PATH_LEN];
+        char method[20];
+        int cmd, internal_event_num, external_event_num;
+        int ret = 0;
+        union acpi_hotkey *key = NULL;
+
+        ACPI_FUNCTION_TRACE(("hotkey_write_config"));
+
+        if (!hotkey_list || count > MAX_CONFIG_RECORD_LEN) {
+                ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid arguments\n"));
+                return_VALUE(-EINVAL);
+        }
+
+        if (copy_from_user(config_record, buffer, count)) {
+                ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid data \n"));
+                return_VALUE(-EINVAL);
+        }
+        config_record[count] = '\0';
+
+        ret = get_parms(config_record,
+                        &cmd,
+                        bus_handle,
+                        bus_method,
+                        action_handle,
+                        method, &internal_event_num, &external_event_num);
+        if (ret != 6) {
+                ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+                                  "Invalid data format ret=%d\n", ret));
+                return_VALUE(-EINVAL);
+        }
+
+        key = kmalloc(sizeof(union acpi_hotkey), GFP_KERNEL);
+        ret = init_hotkey_device(key, bus_handle, action_handle, method,
+                                 internal_event_num, external_event_num);
+
+        if (ret || check_hotkey_valid(key, hotkey_list)) {
+                kfree(key);
+                ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid hotkey \n"));
+                return_VALUE(-EINVAL);
+        }
+        switch (cmd) {
+        case 0:
+                hotkey_add(key);
+                break;
+        case 1:
+                hotkey_remove(key);
+                free_hotkey_device(key);
+                break;
+        case 2:
+                hotkey_update(key);
+                break;
+        default:
+                break;
+        }
+        return_VALUE(count);
+}
+
+/*  count is length for one input record */
+static ssize_t hotkey_write_poll_config(struct file *file,
+                                        const char __user * buffer,
+                                        size_t count, loff_t * data)
+{
+        struct seq_file *m = (struct seq_file *)file->private_data;
+        struct acpi_hotkey_list *hotkey_list =
+            (struct acpi_hotkey_list *)m->private;
+
+        char config_record[MAX_CONFIG_RECORD_LEN];
+        char polling_handle[MAX_NAME_PATH_LEN];
+        char action_handle[MAX_NAME_PATH_LEN];
+        char poll_method[20], action_method[20];
+        int ret, internal_event_num, cmd, external_event_num;
+        union acpi_hotkey *key = NULL;
+
+        ACPI_FUNCTION_TRACE("hotkey_write_poll_config");
+
+        if (!hotkey_list || count > MAX_CONFIG_RECORD_LEN) {
+                ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid arguments\n"));
+                return_VALUE(-EINVAL);
+        }
+
+        if (copy_from_user(config_record, buffer, count)) {
+                ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid data \n"));
+                return_VALUE(-EINVAL);
+        }
+        config_record[count] = '\0';
+
+        ret = get_parms(config_record,
+                        &cmd,
+                        polling_handle,
+                        poll_method,
+                        action_handle,
+                        action_method,
+                        &internal_event_num, &external_event_num);
+
+        if (ret != 6) {
+                ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid data format\n"));
+                return_VALUE(-EINVAL);
+        }
+
+        key = kmalloc(sizeof(union acpi_hotkey), GFP_KERNEL);
+        ret = init_poll_hotkey_device(key, polling_handle, poll_method,
+                                      action_handle, action_method,
+                                      internal_event_num);
+        if (ret || check_hotkey_valid(key, hotkey_list)) {
+                kfree(key);
+                ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid hotkey \n"));
+                return_VALUE(-EINVAL);
+        }
+        switch (cmd) {
+        case 0:
+                hotkey_add(key);
+                break;
+        case 1:
+                hotkey_remove(key);
+                break;
+        case 2:
+                hotkey_update(key);
+                break;
+        default:
+                break;
+        }
+        return_VALUE(count);
+}
+
+/*  
+ * This function evaluates an ACPI method, given an int as parameter, the
+ * method is searched within the scope of the handle, can be NULL. The output
+ * of the method is written is output, which can also be NULL
+ *
+ * returns 1 if write is successful, 0 else.
+ */
+static int write_acpi_int(acpi_handle handle, const char *method, int val,
+                          struct acpi_buffer *output)
+{
+        struct acpi_object_list params; /* list of input parameters (an int here) */
+        union acpi_object in_obj;       /* the only param we use */
+        acpi_status status;
+
+        ACPI_FUNCTION_TRACE("write_acpi_int");
+        params.count = 1;
+        params.pointer = &in_obj;
+        in_obj.type = ACPI_TYPE_INTEGER;
+        in_obj.integer.value = val;
+
+        status = acpi_evaluate_object(handle, (char *)method, &params, output);
+
+        return_VALUE(status == AE_OK);
+}
+
+static int read_acpi_int(acpi_handle handle, const char *method, int *val)
+{
+        struct acpi_buffer output;
+        union acpi_object out_obj;
+        acpi_status status;
+
+        ACPI_FUNCTION_TRACE("read_acpi_int");
+        output.length = sizeof(out_obj);
+        output.pointer = &out_obj;
+
+        status = acpi_evaluate_object(handle, (char *)method, NULL, &output);
+        *val = out_obj.integer.value;
+        return_VALUE((status == AE_OK)
+                     && (out_obj.type == ACPI_TYPE_INTEGER));
+}
+
+static acpi_handle
+get_handle_from_hotkeylist(struct acpi_hotkey_list *hotkey_list, int event_num)
+{
+        struct list_head *entries, *next;
+
+        list_for_each_safe(entries, next, hotkey_list->entries) {
+                union acpi_hotkey *key =
+                    container_of(entries, union acpi_hotkey, entries);
+                if (key->link.hotkey_type == ACPI_HOTKEY_EVENT
+                    && key->link.hotkey_standard_num == event_num) {
+                        return (key->event_hotkey.action_handle);
+                }
+        }
+        return (NULL);
+}
+
+static
+char *get_method_from_hotkeylist(struct acpi_hotkey_list *hotkey_list,
+                                 int event_num)
+{
+        struct list_head *entries, *next;
+
+        list_for_each_safe(entries, next, hotkey_list->entries) {
+                union acpi_hotkey *key =
+                    container_of(entries, union acpi_hotkey, entries);
+
+                if (key->link.hotkey_type == ACPI_HOTKEY_EVENT &&
+                    key->link.hotkey_standard_num == event_num)
+                        return (key->event_hotkey.action_method);
+        }
+        return (NULL);
+}
+
+static struct acpi_polling_hotkey *get_hotkey_by_event(struct
+                                                       acpi_hotkey_list
+                                                       *hotkey_list, int event)
+{
+        struct list_head *entries, *next;
+
+        list_for_each_safe(entries, next, hotkey_list->entries) {
+                union acpi_hotkey *key =
+                    container_of(entries, union acpi_hotkey, entries);
+                if (key->link.hotkey_type == ACPI_HOTKEY_POLLING
+                    && key->link.hotkey_standard_num == event) {
+                        return (&key->poll_hotkey);
+                }
+        }
+        return (NULL);
+}
+
+/*  
+ * user call AML method interface:
+ * Call convention:
+ * echo "event_num: arg type : value"
+ * example: echo "1:1:30" > /proc/acpi/action
+ * Just support 1 integer arg passing to AML method
+ */
+
+static ssize_t hotkey_execute_aml_method(struct file *file,
+                                         const char __user * buffer,
+                                         size_t count, loff_t * data)
+{
+        struct acpi_hotkey_list *hotkey_list = &global_hotkey_list;
+        char arg[MAX_CALL_PARM];
+        int event, type, value;
+
+        char *method;
+        acpi_handle handle;
+
+        ACPI_FUNCTION_TRACE("hotkey_execte_aml_method");
+
+        if (!hotkey_list || count > MAX_CALL_PARM) {
+                ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid argument 1"));
+                return_VALUE(-EINVAL);
+        }
+
+        if (copy_from_user(arg, buffer, count)) {
+                ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid argument 2"));
+                return_VALUE(-EINVAL);
+        }
+
+        arg[count] = '\0';
+
+        if (sscanf(arg, "%d:%d:%d", &event, &type, &value) != 3) {
+                ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid argument 3"));
+                return_VALUE(-EINVAL);
+        }
+
+        if (type == ACPI_TYPE_INTEGER) {
+                handle = get_handle_from_hotkeylist(hotkey_list, event);
+                method = (char *)get_method_from_hotkeylist(hotkey_list, event);
+                if (IS_EVENT(event))
+                        write_acpi_int(handle, method, value, NULL);
+                else if (IS_POLL(event)) {
+                        struct acpi_polling_hotkey *key;
+                        key = (struct acpi_polling_hotkey *)
+                            get_hotkey_by_event(hotkey_list, event);
+                        read_acpi_int(handle, method, key->poll_result);
+                }
+        } else {
+                ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Not supported"));
+                return_VALUE(-EINVAL);
+        }
+
+        return_VALUE(count);
+}
+
+static int __init hotkey_init(void)
+{
+        int result;
+        mode_t mode = S_IFREG | S_IRUGO | S_IWUGO;
+
+        ACPI_FUNCTION_TRACE("hotkey_init");
+
+        if (acpi_disabled)
+                return -ENODEV;
+
+        if (acpi_specific_hotkey_enabled) {
+                printk("Using specific hotkey driver\n");
+                return -ENODEV;
+        }
+
+        hotkey_proc_dir = proc_mkdir(HOTKEY_PROC, acpi_root_dir);
+        if (!hotkey_proc_dir) {
+                ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+                                  "Hotkey: Unable to create %s entry\n",
+                                  HOTKEY_PROC));
+                return (-ENODEV);
+        }
+        hotkey_proc_dir->owner = THIS_MODULE;
+
+        hotkey_config =
+            create_proc_entry(HOTKEY_EV_CONFIG, mode, hotkey_proc_dir);
+        if (!hotkey_config) {
+                ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+                                  "Hotkey: Unable to create %s entry\n",
+                                  HOTKEY_EV_CONFIG));
+                return (-ENODEV);
+        } else {
+                hotkey_config->proc_fops = &hotkey_config_fops;
+                hotkey_config->data = &global_hotkey_list;
+                hotkey_config->owner = THIS_MODULE;
+                hotkey_config->uid = 0;
+                hotkey_config->gid = 0;
+        }
+
+        hotkey_poll_config =
+            create_proc_entry(HOTKEY_PL_CONFIG, mode, hotkey_proc_dir);
+        if (!hotkey_poll_config) {
+                ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+                                  "Hotkey: Unable to create %s entry\n",
+                                  HOTKEY_EV_CONFIG));
+                return (-ENODEV);
+        } else {
+                hotkey_poll_config->proc_fops = &hotkey_poll_config_fops;
+                hotkey_poll_config->data = &global_hotkey_list;
+                hotkey_poll_config->owner = THIS_MODULE;
+                hotkey_poll_config->uid = 0;
+                hotkey_poll_config->gid = 0;
+        }
+
+        hotkey_action = create_proc_entry(HOTKEY_ACTION, mode, hotkey_proc_dir);
+        if (!hotkey_action) {
+                ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+                                  "Hotkey: Unable to create %s entry\n",
+                                  HOTKEY_ACTION));
+                return (-ENODEV);
+        } else {
+                hotkey_action->proc_fops = &hotkey_action_fops;
+                hotkey_action->owner = THIS_MODULE;
+                hotkey_action->uid = 0;
+                hotkey_action->gid = 0;
+        }
+
+        hotkey_info = create_proc_entry(HOTKEY_INFO, mode, hotkey_proc_dir);
+        if (!hotkey_info) {
+                ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+                                  "Hotkey: Unable to create %s entry\n",
+                                  HOTKEY_INFO));
+                return (-ENODEV);
+        } else {
+                hotkey_info->proc_fops = &hotkey_info_fops;
+                hotkey_info->owner = THIS_MODULE;
+                hotkey_info->uid = 0;
+                hotkey_info->gid = 0;
+        }
+
+        result = acpi_bus_register_driver(&hotkey_driver);
+        if (result < 0) {
+                remove_proc_entry(HOTKEY_PROC, acpi_root_dir);
+                return (-ENODEV);
+        }
+        global_hotkey_list.count = 0;
+        global_hotkey_list.entries = &hotkey_entries;
+
+        INIT_LIST_HEAD(&hotkey_entries);
+
+        return (0);
+}
+
+static void __exit hotkey_exit(void)
+{
+        struct list_head *entries, *next;
+
+        ACPI_FUNCTION_TRACE("hotkey_remove");
+
+        list_for_each_safe(entries, next, global_hotkey_list.entries) {
+                union acpi_hotkey *key =
+                    container_of(entries, union acpi_hotkey, entries);
+
+                acpi_os_wait_events_complete(NULL);
+                list_del(&key->link.entries);
+                global_hotkey_list.count--;
+                free_hotkey_device(key);
+        }
+        acpi_bus_unregister_driver(&hotkey_driver);
+        remove_proc_entry(HOTKEY_EV_CONFIG, hotkey_proc_dir);
+        remove_proc_entry(HOTKEY_PL_CONFIG, hotkey_proc_dir);
+        remove_proc_entry(HOTKEY_ACTION, hotkey_proc_dir);
+        remove_proc_entry(HOTKEY_INFO, hotkey_proc_dir);
+        remove_proc_entry(HOTKEY_PROC, acpi_root_dir);
+        return;
+}
+
+module_init(hotkey_init);
+module_exit(hotkey_exit);