+++ /dev/null
-/*
- * 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);
projects / openwrt / staging / blogic.git / commitdiff