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OpenCloudOS-Kernel/drivers/acpi/hotkey.c

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/*
* 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;
mode_t mode;
ACPI_FUNCTION_TRACE("create_polling_proc");
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);
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