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>

diff --git a/drivers/staging/quickstart/quickstart.c b/drivers/staging/quickstart/quickstart.c
new file mode 100644 (file)
index 0000000..6612247
--- /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);