diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/staging/quickstart/quickstart.c | 474 |
1 files changed, 474 insertions, 0 deletions
diff --git a/drivers/staging/quickstart/quickstart.c b/drivers/staging/quickstart/quickstart.c new file mode 100644 index 000000000000..66122479d529 --- /dev/null +++ b/drivers/staging/quickstart/quickstart.c @@ -0,0 +1,474 @@ +/* + * quickstart.c - ACPI Direct App Launch driver + * + * + * Copyright (C) 2007-2010 Angelo Arrifano <miknix@gmail.com> + * + * Information gathered from disassebled dsdt and from here: + * "http://download.microsoft.com/download/9/c/5/ + * 9c5b2167-8017-4bae-9fde-d599bac8184a/DirAppLaunch_Vista.doc" + * + * 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 "1.03" + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/types.h> +#include <acpi/acpi_drivers.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" +#define QUICKSTART_PF_DEVATTR_NAME "pressed_button" + +#define QUICKSTART_MAX_BTN_NAME_LEN 16 + +/* 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_btn { + char *name; + unsigned int id; + struct quickstart_btn *next; +}; + +static struct quickstart_driver_data { + struct quickstart_btn *btn_lst; + struct quickstart_btn *pressed; +} quickstart_data; + +/* ACPI driver Structs */ +struct quickstart_acpi { + struct acpi_device *device; + struct quickstart_btn *btn; +}; +static int quickstart_acpi_add(struct acpi_device *device); +static int quickstart_acpi_remove(struct acpi_device *device, int type); +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, + }, +}; + +/* Input device structs */ +struct input_dev *quickstart_input; + +/* Platform driver structs */ +static ssize_t buttons_show(struct device *dev, + struct device_attribute *attr, + char *buf); +static ssize_t pressed_button_show(struct device *dev, + struct device_attribute *attr, + char *buf); +static ssize_t pressed_button_store(struct device *dev, + struct device_attribute *attr, + const char *buf, + size_t count); +static DEVICE_ATTR(pressed_button, 0666, pressed_button_show, + pressed_button_store); +static DEVICE_ATTR(buttons, 0444, buttons_show, NULL); +static struct platform_device *pf_device; +static struct platform_driver pf_driver = { + .driver = { + .name = QUICKSTART_PF_DRIVER_NAME, + .owner = THIS_MODULE, + } +}; + +/* + * Platform driver functions + */ +static ssize_t buttons_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + int count = 0; + struct quickstart_btn *ptr = quickstart_data.btn_lst; + + if (!ptr) + return snprintf(buf, PAGE_SIZE, "none"); + + while (ptr && (count < PAGE_SIZE)) { + if (ptr->name) { + count += snprintf(buf + count, + PAGE_SIZE - count, + "%d\t%s\n", ptr->id, ptr->name); + } + ptr = ptr->next; + } + + return count; +} + +static ssize_t pressed_button_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + return snprintf(buf, PAGE_SIZE, "%s\n", + (quickstart_data.pressed?quickstart_data.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; + + quickstart_data.pressed = NULL; + return count; +} + +/* Hotstart Helper functions */ +static int quickstart_btnlst_add(struct quickstart_btn **data) +{ + struct quickstart_btn **ptr = &quickstart_data.btn_lst; + + while (*ptr) + ptr = &((*ptr)->next); + + *ptr = kzalloc(sizeof(struct quickstart_btn), GFP_KERNEL); + if (!*ptr) { + *data = NULL; + return -ENOMEM; + } + *data = *ptr; + + return 0; +} + +static void quickstart_btnlst_del(struct quickstart_btn *data) +{ + struct quickstart_btn **ptr = &quickstart_data.btn_lst; + + if (!data) + return; + + while (*ptr) { + if (*ptr == data) { + *ptr = (*ptr)->next; + kfree(data); + return; + } + ptr = &((*ptr)->next); + } + + return; +} + +static void quickstart_btnlst_free(void) +{ + struct quickstart_btn *ptr = quickstart_data.btn_lst; + struct quickstart_btn *lptr = NULL; + + while (ptr) { + lptr = ptr; + ptr = ptr->next; + kfree(lptr->name); + kfree(lptr); + } + + return; +} + +/* ACPI Driver functions */ +static void quickstart_acpi_notify(acpi_handle handle, u32 event, void *data) +{ + struct quickstart_acpi *quickstart = data; + + if (!quickstart) + return; + + if (event == QUICKSTART_EVENT_WAKE) + quickstart_data.pressed = quickstart->btn; + else if (event == QUICKSTART_EVENT_RUNTIME) { + input_report_key(quickstart_input, quickstart->btn->id, 1); + input_sync(quickstart_input); + input_report_key(quickstart_input, quickstart->btn->id, 0); + input_sync(quickstart_input); + } + return; +} + +static void quickstart_acpi_ghid(struct quickstart_acpi *quickstart) +{ + acpi_status status; + struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; + uint32_t usageid = 0; + + if (!quickstart) + return; + + /* 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) || !buffer.pointer) { + printk(KERN_ERR "quickstart: %s GHID method failed.\n", + quickstart->btn->name); + return; + } + + if (buffer.length < 8) + return; + + /* <<The GHID method can return a BYTE, WORD, or DWORD. + * The value must be encoded in little-endian byte + * order (least significant byte first).>> */ + usageid = *((uint32_t *)(buffer.pointer + (buffer.length - 8))); + quickstart->btn->id = usageid; + + kfree(buffer.pointer); +} + +static int quickstart_acpi_config(struct quickstart_acpi *quickstart, char *bid) +{ + int len = strlen(bid); + int ret; + + /* Add button to list */ + ret = quickstart_btnlst_add(&quickstart->btn); + if (ret) + return ret; + + quickstart->btn->name = kzalloc(len + 1, GFP_KERNEL); + if (!quickstart->btn->name) { + quickstart_btnlst_free(); + return -ENOMEM; + } + strcpy(quickstart->btn->name, bid); + + return 0; +} + +static int quickstart_acpi_add(struct acpi_device *device) +{ + int ret = 0; + acpi_status status = AE_OK; + struct quickstart_acpi *quickstart = NULL; + + if (!device) + return -EINVAL; + + quickstart = kzalloc(sizeof(struct quickstart_acpi), 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, acpi_device_bid(device)); + if (ret) + goto fail_config; + + status = acpi_install_notify_handler(device->handle, + ACPI_ALL_NOTIFY, + quickstart_acpi_notify, + quickstart); + if (ACPI_FAILURE(status)) { + printk(KERN_ERR "quickstart: Notify handler install error\n"); + ret = -ENODEV; + goto fail_installnotify; + } + + quickstart_acpi_ghid(quickstart); + + return 0; + +fail_installnotify: + quickstart_btnlst_del(quickstart->btn); + +fail_config: + + kfree(quickstart); + + return ret; +} + +static int quickstart_acpi_remove(struct acpi_device *device, int type) +{ + acpi_status status = 0; + struct quickstart_acpi *quickstart = NULL; + + if (!device || !acpi_driver_data(device)) + return -EINVAL; + + quickstart = acpi_driver_data(device); + + status = acpi_remove_notify_handler(device->handle, + ACPI_ALL_NOTIFY, + quickstart_acpi_notify); + if (ACPI_FAILURE(status)) + printk(KERN_ERR "quickstart: Error removing notify handler\n"); + + + kfree(quickstart); + + return 0; +} + +/* Module functions */ + +static void quickstart_exit(void) +{ + input_unregister_device(quickstart_input); + input_free_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_btnlst_free(); + + return; +} + +static int __init quickstart_init_input(void) +{ + struct quickstart_btn **ptr = &quickstart_data.btn_lst; + int count; + + quickstart_input = input_allocate_device(); + + if (!quickstart_input) + return -ENOMEM; + + quickstart_input->name = "Quickstart ACPI Buttons"; + quickstart_input->id.bustype = BUS_HOST; + + while (*ptr) { + count++; + set_bit(EV_KEY, quickstart_input->evbit); + set_bit((*ptr)->id, quickstart_input->keybit); + ptr = &((*ptr)->next); + } + + return input_register_device(quickstart_input); +} + +static int __init quickstart_init(void) +{ + int ret; + acpi_status status = 0; + + /* ACPI Check */ + if (acpi_disabled) + return -ENODEV; + + /* ACPI driver register */ + status = acpi_bus_register_driver(&quickstart_acpi_driver); + if (status < 0) + return -ENODEV; + + /* If existing bus with no devices */ + if (!quickstart_data.btn_lst) { + 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; + + printk(KERN_INFO "quickstart: 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); |