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https://github.com/torvalds/linux
synced 2024-11-05 18:23:50 +00:00
Staging: add quickstart acpi key driver
This adds the quickstart acpi key driver to the staging tree Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Angelo Arrifano
Greg Kroah-Hartman
parent
dc899971a1
commit
6da4cd4690
1 changed files with 474 additions and 0 deletions
474
drivers/staging/quickstart/quickstart.c
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474
drivers/staging/quickstart/quickstart.c
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@ -0,0 +1,474 @@
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/*
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* quickstart.c - ACPI Direct App Launch driver
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*
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*
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* Copyright (C) 2007-2010 Angelo Arrifano <miknix@gmail.com>
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*
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* Information gathered from disassebled dsdt and from here:
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* "http://download.microsoft.com/download/9/c/5/
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* 9c5b2167-8017-4bae-9fde-d599bac8184a/DirAppLaunch_Vista.doc"
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#define QUICKSTART_VERSION "1.03"
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/types.h>
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#include <acpi/acpi_drivers.h>
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#include <linux/platform_device.h>
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#include <linux/input.h>
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MODULE_AUTHOR("Angelo Arrifano");
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MODULE_DESCRIPTION("ACPI Direct App Launch driver");
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MODULE_LICENSE("GPL");
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#define QUICKSTART_ACPI_DEVICE_NAME "quickstart"
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#define QUICKSTART_ACPI_CLASS "quickstart"
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#define QUICKSTART_ACPI_HID "PNP0C32"
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#define QUICKSTART_PF_DRIVER_NAME "quickstart"
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#define QUICKSTART_PF_DEVICE_NAME "quickstart"
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#define QUICKSTART_PF_DEVATTR_NAME "pressed_button"
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#define QUICKSTART_MAX_BTN_NAME_LEN 16
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/* There will be two events:
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* 0x02 - A hot button was pressed while device was off/sleeping.
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* 0x80 - A hot button was pressed while device was up. */
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#define QUICKSTART_EVENT_WAKE 0x02
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#define QUICKSTART_EVENT_RUNTIME 0x80
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struct quickstart_btn {
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char *name;
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unsigned int id;
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struct quickstart_btn *next;
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};
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static struct quickstart_driver_data {
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struct quickstart_btn *btn_lst;
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struct quickstart_btn *pressed;
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} quickstart_data;
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/* ACPI driver Structs */
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struct quickstart_acpi {
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struct acpi_device *device;
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struct quickstart_btn *btn;
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};
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static int quickstart_acpi_add(struct acpi_device *device);
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static int quickstart_acpi_remove(struct acpi_device *device, int type);
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static const struct acpi_device_id quickstart_device_ids[] = {
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{QUICKSTART_ACPI_HID, 0},
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{"", 0},
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};
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static struct acpi_driver quickstart_acpi_driver = {
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.name = "quickstart",
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.class = QUICKSTART_ACPI_CLASS,
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.ids = quickstart_device_ids,
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.ops = {
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.add = quickstart_acpi_add,
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.remove = quickstart_acpi_remove,
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},
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};
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/* Input device structs */
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struct input_dev *quickstart_input;
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/* Platform driver structs */
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static ssize_t buttons_show(struct device *dev,
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struct device_attribute *attr,
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char *buf);
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static ssize_t pressed_button_show(struct device *dev,
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struct device_attribute *attr,
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char *buf);
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static ssize_t pressed_button_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf,
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size_t count);
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static DEVICE_ATTR(pressed_button, 0666, pressed_button_show,
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pressed_button_store);
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static DEVICE_ATTR(buttons, 0444, buttons_show, NULL);
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static struct platform_device *pf_device;
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static struct platform_driver pf_driver = {
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.driver = {
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.name = QUICKSTART_PF_DRIVER_NAME,
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.owner = THIS_MODULE,
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}
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};
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/*
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* Platform driver functions
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*/
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static ssize_t buttons_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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int count = 0;
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struct quickstart_btn *ptr = quickstart_data.btn_lst;
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if (!ptr)
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return snprintf(buf, PAGE_SIZE, "none");
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while (ptr && (count < PAGE_SIZE)) {
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if (ptr->name) {
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count += snprintf(buf + count,
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PAGE_SIZE - count,
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"%d\t%s\n", ptr->id, ptr->name);
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}
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ptr = ptr->next;
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}
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return count;
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}
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static ssize_t pressed_button_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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return snprintf(buf, PAGE_SIZE, "%s\n",
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(quickstart_data.pressed?quickstart_data.pressed->name:"none"));
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}
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static ssize_t pressed_button_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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if (count < 2)
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return -EINVAL;
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if (strncasecmp(buf, "none", 4) != 0)
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return -EINVAL;
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quickstart_data.pressed = NULL;
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return count;
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}
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/* Hotstart Helper functions */
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static int quickstart_btnlst_add(struct quickstart_btn **data)
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{
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struct quickstart_btn **ptr = &quickstart_data.btn_lst;
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while (*ptr)
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ptr = &((*ptr)->next);
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*ptr = kzalloc(sizeof(struct quickstart_btn), GFP_KERNEL);
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if (!*ptr) {
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*data = NULL;
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return -ENOMEM;
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}
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*data = *ptr;
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return 0;
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}
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static void quickstart_btnlst_del(struct quickstart_btn *data)
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{
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struct quickstart_btn **ptr = &quickstart_data.btn_lst;
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if (!data)
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return;
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while (*ptr) {
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if (*ptr == data) {
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*ptr = (*ptr)->next;
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kfree(data);
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return;
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}
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ptr = &((*ptr)->next);
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}
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return;
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}
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static void quickstart_btnlst_free(void)
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{
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struct quickstart_btn *ptr = quickstart_data.btn_lst;
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struct quickstart_btn *lptr = NULL;
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while (ptr) {
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lptr = ptr;
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ptr = ptr->next;
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kfree(lptr->name);
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kfree(lptr);
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}
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return;
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}
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/* ACPI Driver functions */
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static void quickstart_acpi_notify(acpi_handle handle, u32 event, void *data)
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{
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struct quickstart_acpi *quickstart = data;
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if (!quickstart)
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return;
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if (event == QUICKSTART_EVENT_WAKE)
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quickstart_data.pressed = quickstart->btn;
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else if (event == QUICKSTART_EVENT_RUNTIME) {
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input_report_key(quickstart_input, quickstart->btn->id, 1);
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input_sync(quickstart_input);
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input_report_key(quickstart_input, quickstart->btn->id, 0);
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input_sync(quickstart_input);
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}
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return;
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}
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static void quickstart_acpi_ghid(struct quickstart_acpi *quickstart)
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{
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acpi_status status;
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struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
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uint32_t usageid = 0;
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if (!quickstart)
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return;
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/* This returns a buffer telling the button usage ID,
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* and triggers pending notify events (The ones before booting). */
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status = acpi_evaluate_object(quickstart->device->handle,
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"GHID", NULL, &buffer);
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if (ACPI_FAILURE(status) || !buffer.pointer) {
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printk(KERN_ERR "quickstart: %s GHID method failed.\n",
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quickstart->btn->name);
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return;
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}
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if (buffer.length < 8)
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return;
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/* <<The GHID method can return a BYTE, WORD, or DWORD.
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* The value must be encoded in little-endian byte
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* order (least significant byte first).>> */
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usageid = *((uint32_t *)(buffer.pointer + (buffer.length - 8)));
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quickstart->btn->id = usageid;
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kfree(buffer.pointer);
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}
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static int quickstart_acpi_config(struct quickstart_acpi *quickstart, char *bid)
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{
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int len = strlen(bid);
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int ret;
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/* Add button to list */
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ret = quickstart_btnlst_add(&quickstart->btn);
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if (ret)
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return ret;
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quickstart->btn->name = kzalloc(len + 1, GFP_KERNEL);
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if (!quickstart->btn->name) {
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quickstart_btnlst_free();
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return -ENOMEM;
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}
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strcpy(quickstart->btn->name, bid);
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return 0;
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}
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static int quickstart_acpi_add(struct acpi_device *device)
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{
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int ret = 0;
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acpi_status status = AE_OK;
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struct quickstart_acpi *quickstart = NULL;
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if (!device)
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return -EINVAL;
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quickstart = kzalloc(sizeof(struct quickstart_acpi), GFP_KERNEL);
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if (!quickstart)
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return -ENOMEM;
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quickstart->device = device;
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strcpy(acpi_device_name(device), QUICKSTART_ACPI_DEVICE_NAME);
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strcpy(acpi_device_class(device), QUICKSTART_ACPI_CLASS);
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device->driver_data = quickstart;
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/* Add button to list and initialize some stuff */
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ret = quickstart_acpi_config(quickstart, acpi_device_bid(device));
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if (ret)
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goto fail_config;
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status = acpi_install_notify_handler(device->handle,
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ACPI_ALL_NOTIFY,
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quickstart_acpi_notify,
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quickstart);
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if (ACPI_FAILURE(status)) {
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printk(KERN_ERR "quickstart: Notify handler install error\n");
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ret = -ENODEV;
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goto fail_installnotify;
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}
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quickstart_acpi_ghid(quickstart);
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return 0;
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fail_installnotify:
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quickstart_btnlst_del(quickstart->btn);
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fail_config:
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kfree(quickstart);
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return ret;
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}
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static int quickstart_acpi_remove(struct acpi_device *device, int type)
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{
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acpi_status status = 0;
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struct quickstart_acpi *quickstart = NULL;
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if (!device || !acpi_driver_data(device))
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return -EINVAL;
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quickstart = acpi_driver_data(device);
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status = acpi_remove_notify_handler(device->handle,
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ACPI_ALL_NOTIFY,
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quickstart_acpi_notify);
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if (ACPI_FAILURE(status))
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printk(KERN_ERR "quickstart: Error removing notify handler\n");
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kfree(quickstart);
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return 0;
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}
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/* Module functions */
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static void quickstart_exit(void)
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{
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input_unregister_device(quickstart_input);
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input_free_device(quickstart_input);
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device_remove_file(&pf_device->dev, &dev_attr_pressed_button);
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device_remove_file(&pf_device->dev, &dev_attr_buttons);
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platform_device_unregister(pf_device);
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platform_driver_unregister(&pf_driver);
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acpi_bus_unregister_driver(&quickstart_acpi_driver);
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quickstart_btnlst_free();
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return;
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}
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static int __init quickstart_init_input(void)
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{
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struct quickstart_btn **ptr = &quickstart_data.btn_lst;
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int count;
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quickstart_input = input_allocate_device();
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if (!quickstart_input)
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return -ENOMEM;
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quickstart_input->name = "Quickstart ACPI Buttons";
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quickstart_input->id.bustype = BUS_HOST;
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while (*ptr) {
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count++;
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set_bit(EV_KEY, quickstart_input->evbit);
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set_bit((*ptr)->id, quickstart_input->keybit);
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ptr = &((*ptr)->next);
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}
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return input_register_device(quickstart_input);
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}
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static int __init quickstart_init(void)
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{
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int ret;
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acpi_status status = 0;
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/* ACPI Check */
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if (acpi_disabled)
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return -ENODEV;
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/* ACPI driver register */
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status = acpi_bus_register_driver(&quickstart_acpi_driver);
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if (status < 0)
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return -ENODEV;
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/* If existing bus with no devices */
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if (!quickstart_data.btn_lst) {
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ret = -ENODEV;
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goto fail_pfdrv_reg;
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}
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/* Platform driver register */
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ret = platform_driver_register(&pf_driver);
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if (ret)
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goto fail_pfdrv_reg;
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/* Platform device register */
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pf_device = platform_device_alloc(QUICKSTART_PF_DEVICE_NAME, -1);
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if (!pf_device) {
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ret = -ENOMEM;
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goto fail_pfdev_alloc;
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}
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ret = platform_device_add(pf_device);
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if (ret)
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goto fail_pfdev_add;
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/* Create device sysfs file */
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ret = device_create_file(&pf_device->dev, &dev_attr_pressed_button);
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if (ret)
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goto fail_dev_file;
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ret = device_create_file(&pf_device->dev, &dev_attr_buttons);
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if (ret)
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goto fail_dev_file2;
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/* Input device */
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ret = quickstart_init_input();
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if (ret)
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goto fail_input;
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printk(KERN_INFO "quickstart: ACPI Direct App Launch ver %s\n",
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QUICKSTART_VERSION);
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return 0;
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fail_input:
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device_remove_file(&pf_device->dev, &dev_attr_buttons);
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fail_dev_file2:
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device_remove_file(&pf_device->dev, &dev_attr_pressed_button);
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fail_dev_file:
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platform_device_del(pf_device);
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fail_pfdev_add:
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platform_device_put(pf_device);
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fail_pfdev_alloc:
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platform_driver_unregister(&pf_driver);
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fail_pfdrv_reg:
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acpi_bus_unregister_driver(&quickstart_acpi_driver);
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return ret;
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}
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module_init(quickstart_init);
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module_exit(quickstart_exit);
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