blob: a85c3d68c462b1a14b8a517445521a6df61bf64e [file] [log] [blame]
/*
* quickstart.c - ACPI Direct App Launch driver
*
*
* Copyright (C) 2007-2010 Angelo Arrifano <miknix@gmail.com>
*
* Information gathered from disassembled dsdt and from here:
* <http://www.microsoft.com/whdc/system/platform/firmware/DirAppLaunch.mspx>
*
* 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
*
*/
#define QUICKSTART_VERSION "1.04"
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/acpi.h>
#include <linux/platform_device.h>
#include <linux/input.h>
MODULE_AUTHOR("Angelo Arrifano");
MODULE_DESCRIPTION("ACPI Direct App Launch driver");
MODULE_LICENSE("GPL");
#define QUICKSTART_ACPI_DEVICE_NAME "quickstart"
#define QUICKSTART_ACPI_CLASS "quickstart"
#define QUICKSTART_ACPI_HID "PNP0C32"
#define QUICKSTART_PF_DRIVER_NAME "quickstart"
#define QUICKSTART_PF_DEVICE_NAME "quickstart"
/*
* There will be two events:
* 0x02 - A hot button was pressed while device was off/sleeping.
* 0x80 - A hot button was pressed while device was up.
*/
#define QUICKSTART_EVENT_WAKE 0x02
#define QUICKSTART_EVENT_RUNTIME 0x80
struct quickstart_button {
char *name;
unsigned int id;
struct list_head list;
};
struct quickstart_acpi {
struct acpi_device *device;
struct quickstart_button *button;
};
static LIST_HEAD(buttons);
static struct quickstart_button *pressed;
static struct input_dev *quickstart_input;
/* Platform driver functions */
static ssize_t buttons_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
int count = 0;
struct quickstart_button *b;
if (list_empty(&buttons))
return snprintf(buf, PAGE_SIZE, "none");
list_for_each_entry(b, &buttons, list) {
count += snprintf(buf + count, PAGE_SIZE - count, "%u\t%s\n",
b->id, b->name);
if (count >= PAGE_SIZE) {
count = PAGE_SIZE;
break;
}
}
return count;
}
static ssize_t pressed_button_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
return scnprintf(buf, PAGE_SIZE, "%s\n",
(pressed ? pressed->name : "none"));
}
static ssize_t pressed_button_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
if (count < 2)
return -EINVAL;
if (strncasecmp(buf, "none", 4) != 0)
return -EINVAL;
pressed = NULL;
return count;
}
/* Helper functions */
static struct quickstart_button *quickstart_buttons_add(void)
{
struct quickstart_button *b;
b = kzalloc(sizeof(*b), GFP_KERNEL);
if (!b)
return NULL;
list_add_tail(&b->list, &buttons);
return b;
}
static void quickstart_button_del(struct quickstart_button *data)
{
if (!data)
return;
list_del(&data->list);
kfree(data->name);
kfree(data);
}
static void quickstart_buttons_free(void)
{
struct quickstart_button *b, *n;
list_for_each_entry_safe(b, n, &buttons, list)
quickstart_button_del(b);
}
/* ACPI Driver functions */
static void quickstart_acpi_notify(acpi_handle handle, u32 event, void *data)
{
struct quickstart_acpi *quickstart = data;
if (!quickstart)
return;
switch (event) {
case QUICKSTART_EVENT_WAKE:
pressed = quickstart->button;
break;
case QUICKSTART_EVENT_RUNTIME:
input_report_key(quickstart_input, quickstart->button->id, 1);
input_sync(quickstart_input);
input_report_key(quickstart_input, quickstart->button->id, 0);
input_sync(quickstart_input);
break;
default:
pr_err("Unexpected ACPI event notify (%u)\n", event);
break;
}
}
static int quickstart_acpi_ghid(struct quickstart_acpi *quickstart)
{
acpi_status status;
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
int ret = 0;
/*
* This returns a buffer telling the button usage ID,
* and triggers pending notify events (The ones before booting).
*/
status = acpi_evaluate_object(quickstart->device->handle, "GHID", NULL,
&buffer);
if (ACPI_FAILURE(status)) {
pr_err("%s GHID method failed\n", quickstart->button->name);
return -EINVAL;
}
/*
* <<The GHID method can return a BYTE, WORD, or DWORD.
* The value must be encoded in little-endian byte
* order (least significant byte first).>>
*/
switch (buffer.length) {
case 1:
quickstart->button->id = *(uint8_t *)buffer.pointer;
break;
case 2:
quickstart->button->id = *(uint16_t *)buffer.pointer;
break;
case 4:
quickstart->button->id = *(uint32_t *)buffer.pointer;
break;
case 8:
quickstart->button->id = *(uint64_t *)buffer.pointer;
break;
default:
pr_err("%s GHID method returned buffer of unexpected length %lu\n",
quickstart->button->name,
(unsigned long)buffer.length);
ret = -EINVAL;
break;
}
kfree(buffer.pointer);
return ret;
}
static int quickstart_acpi_config(struct quickstart_acpi *quickstart)
{
char *bid = acpi_device_bid(quickstart->device);
char *name;
name = kmalloc(strlen(bid) + 1, GFP_KERNEL);
if (!name)
return -ENOMEM;
/* Add new button to list */
quickstart->button = quickstart_buttons_add();
if (!quickstart->button) {
kfree(name);
return -ENOMEM;
}
quickstart->button->name = name;
strcpy(quickstart->button->name, bid);
return 0;
}
static int quickstart_acpi_add(struct acpi_device *device)
{
int ret;
acpi_status status;
struct quickstart_acpi *quickstart;
if (!device)
return -EINVAL;
quickstart = kzalloc(sizeof(*quickstart), GFP_KERNEL);
if (!quickstart)
return -ENOMEM;
quickstart->device = device;
strcpy(acpi_device_name(device), QUICKSTART_ACPI_DEVICE_NAME);
strcpy(acpi_device_class(device), QUICKSTART_ACPI_CLASS);
device->driver_data = quickstart;
/* Add button to list and initialize some stuff */
ret = quickstart_acpi_config(quickstart);
if (ret < 0)
goto fail_config;
status = acpi_install_notify_handler(device->handle, ACPI_ALL_NOTIFY,
quickstart_acpi_notify,
quickstart);
if (ACPI_FAILURE(status)) {
pr_err("Notify handler install error\n");
ret = -ENODEV;
goto fail_installnotify;
}
ret = quickstart_acpi_ghid(quickstart);
if (ret < 0)
goto fail_ghid;
return 0;
fail_ghid:
acpi_remove_notify_handler(device->handle, ACPI_ALL_NOTIFY,
quickstart_acpi_notify);
fail_installnotify:
quickstart_button_del(quickstart->button);
fail_config:
kfree(quickstart);
return ret;
}
static int quickstart_acpi_remove(struct acpi_device *device)
{
acpi_status status;
struct quickstart_acpi *quickstart;
if (!device)
return -EINVAL;
quickstart = acpi_driver_data(device);
if (!quickstart)
return -EINVAL;
status = acpi_remove_notify_handler(device->handle, ACPI_ALL_NOTIFY,
quickstart_acpi_notify);
if (ACPI_FAILURE(status))
pr_err("Error removing notify handler\n");
kfree(quickstart);
return 0;
}
/* Platform driver structs */
static DEVICE_ATTR_RW(pressed_button);
static DEVICE_ATTR_RO(buttons);
static struct platform_device *pf_device;
static struct platform_driver pf_driver = {
.driver = {
.name = QUICKSTART_PF_DRIVER_NAME,
.owner = THIS_MODULE,
}
};
static const struct acpi_device_id quickstart_device_ids[] = {
{QUICKSTART_ACPI_HID, 0},
{"", 0},
};
static struct acpi_driver quickstart_acpi_driver = {
.name = "quickstart",
.class = QUICKSTART_ACPI_CLASS,
.ids = quickstart_device_ids,
.ops = {
.add = quickstart_acpi_add,
.remove = quickstart_acpi_remove,
},
};
/* Module functions */
static void quickstart_exit(void)
{
input_unregister_device(quickstart_input);
device_remove_file(&pf_device->dev, &dev_attr_pressed_button);
device_remove_file(&pf_device->dev, &dev_attr_buttons);
platform_device_unregister(pf_device);
platform_driver_unregister(&pf_driver);
acpi_bus_unregister_driver(&quickstart_acpi_driver);
quickstart_buttons_free();
}
static int __init quickstart_init_input(void)
{
struct quickstart_button *b;
int ret;
quickstart_input = input_allocate_device();
if (!quickstart_input)
return -ENOMEM;
quickstart_input->name = "Quickstart ACPI Buttons";
quickstart_input->id.bustype = BUS_HOST;
list_for_each_entry(b, &buttons, list) {
set_bit(EV_KEY, quickstart_input->evbit);
set_bit(b->id, quickstart_input->keybit);
}
ret = input_register_device(quickstart_input);
if (ret) {
input_free_device(quickstart_input);
return ret;
}
return 0;
}
static int __init quickstart_init(void)
{
int ret;
/* ACPI driver register */
ret = acpi_bus_register_driver(&quickstart_acpi_driver);
if (ret)
return ret;
/* If existing bus with no devices */
if (list_empty(&buttons)) {
ret = -ENODEV;
goto fail_pfdrv_reg;
}
/* Platform driver register */
ret = platform_driver_register(&pf_driver);
if (ret)
goto fail_pfdrv_reg;
/* Platform device register */
pf_device = platform_device_alloc(QUICKSTART_PF_DEVICE_NAME, -1);
if (!pf_device) {
ret = -ENOMEM;
goto fail_pfdev_alloc;
}
ret = platform_device_add(pf_device);
if (ret)
goto fail_pfdev_add;
/* Create device sysfs file */
ret = device_create_file(&pf_device->dev, &dev_attr_pressed_button);
if (ret)
goto fail_dev_file;
ret = device_create_file(&pf_device->dev, &dev_attr_buttons);
if (ret)
goto fail_dev_file2;
/* Input device */
ret = quickstart_init_input();
if (ret)
goto fail_input;
pr_info("ACPI Direct App Launch ver %s\n", QUICKSTART_VERSION);
return 0;
fail_input:
device_remove_file(&pf_device->dev, &dev_attr_buttons);
fail_dev_file2:
device_remove_file(&pf_device->dev, &dev_attr_pressed_button);
fail_dev_file:
platform_device_del(pf_device);
fail_pfdev_add:
platform_device_put(pf_device);
fail_pfdev_alloc:
platform_driver_unregister(&pf_driver);
fail_pfdrv_reg:
acpi_bus_unregister_driver(&quickstart_acpi_driver);
return ret;
}
module_init(quickstart_init);
module_exit(quickstart_exit);