283 lines
6.8 KiB
C
283 lines
6.8 KiB
C
/*
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* acpi_container.c - ACPI Generic Container Driver
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* ($Revision: )
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*
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* Copyright (C) 2004 Anil S Keshavamurthy (anil.s.keshavamurthy@intel.com)
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* Copyright (C) 2004 Keiichiro Tokunaga (tokunaga.keiich@jp.fujitsu.com)
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* Copyright (C) 2004 Motoyuki Ito (motoyuki@soft.fujitsu.com)
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* Copyright (C) 2004 Intel Corp.
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* Copyright (C) 2004 FUJITSU LIMITED
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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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 (at
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* 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, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* 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 along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*/
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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 <linux/acpi.h>
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#include <acpi/acpi_bus.h>
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#include <acpi/acpi_drivers.h>
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#include <acpi/container.h>
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#define PREFIX "ACPI: "
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#define ACPI_CONTAINER_DEVICE_NAME "ACPI container device"
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#define ACPI_CONTAINER_CLASS "container"
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#define INSTALL_NOTIFY_HANDLER 1
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#define UNINSTALL_NOTIFY_HANDLER 2
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#define _COMPONENT ACPI_CONTAINER_COMPONENT
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ACPI_MODULE_NAME("container");
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MODULE_AUTHOR("Anil S Keshavamurthy");
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MODULE_DESCRIPTION("ACPI container driver");
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MODULE_LICENSE("GPL");
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static int acpi_container_add(struct acpi_device *device);
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static int acpi_container_remove(struct acpi_device *device, int type);
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static const struct acpi_device_id container_device_ids[] = {
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{"ACPI0004", 0},
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{"PNP0A05", 0},
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{"PNP0A06", 0},
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{"", 0},
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};
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MODULE_DEVICE_TABLE(acpi, container_device_ids);
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static struct acpi_driver acpi_container_driver = {
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.name = "container",
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.class = ACPI_CONTAINER_CLASS,
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.ids = container_device_ids,
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.ops = {
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.add = acpi_container_add,
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.remove = acpi_container_remove,
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},
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};
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/*******************************************************************/
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static int is_device_present(acpi_handle handle)
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{
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acpi_handle temp;
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acpi_status status;
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unsigned long long sta;
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status = acpi_get_handle(handle, "_STA", &temp);
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if (ACPI_FAILURE(status))
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return 1; /* _STA not found, assume device present */
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status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
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if (ACPI_FAILURE(status))
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return 0; /* Firmware error */
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return ((sta & ACPI_STA_DEVICE_PRESENT) == ACPI_STA_DEVICE_PRESENT);
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}
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/*******************************************************************/
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static int acpi_container_add(struct acpi_device *device)
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{
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struct acpi_container *container;
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if (!device) {
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printk(KERN_ERR PREFIX "device is NULL\n");
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return -EINVAL;
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}
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container = kzalloc(sizeof(struct acpi_container), GFP_KERNEL);
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if (!container)
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return -ENOMEM;
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container->handle = device->handle;
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strcpy(acpi_device_name(device), ACPI_CONTAINER_DEVICE_NAME);
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strcpy(acpi_device_class(device), ACPI_CONTAINER_CLASS);
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device->driver_data = container;
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device <%s> bid <%s>\n",
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acpi_device_name(device), acpi_device_bid(device)));
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return 0;
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}
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static int acpi_container_remove(struct acpi_device *device, int type)
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{
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acpi_status status = AE_OK;
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struct acpi_container *pc = NULL;
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pc = acpi_driver_data(device);
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kfree(pc);
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return status;
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}
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static int container_device_add(struct acpi_device **device, acpi_handle handle)
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{
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acpi_handle phandle;
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struct acpi_device *pdev;
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int result;
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if (acpi_get_parent(handle, &phandle)) {
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return -ENODEV;
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}
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if (acpi_bus_get_device(phandle, &pdev)) {
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return -ENODEV;
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}
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if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_DEVICE)) {
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return -ENODEV;
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}
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result = acpi_bus_start(*device);
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return result;
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}
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static void container_notify_cb(acpi_handle handle, u32 type, void *context)
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{
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struct acpi_device *device = NULL;
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int result;
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int present;
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acpi_status status;
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present = is_device_present(handle);
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switch (type) {
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case ACPI_NOTIFY_BUS_CHECK:
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/* Fall through */
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case ACPI_NOTIFY_DEVICE_CHECK:
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printk(KERN_WARNING "Container driver received %s event\n",
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(type == ACPI_NOTIFY_BUS_CHECK) ?
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"ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK");
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status = acpi_bus_get_device(handle, &device);
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if (present) {
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if (ACPI_FAILURE(status) || !device) {
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result = container_device_add(&device, handle);
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if (!result)
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kobject_uevent(&device->dev.kobj,
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KOBJ_ONLINE);
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else
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printk(KERN_WARNING
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"Failed to add container\n");
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}
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} else {
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if (ACPI_SUCCESS(status)) {
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/* device exist and this is a remove request */
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kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
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}
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}
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break;
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case ACPI_NOTIFY_EJECT_REQUEST:
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if (!acpi_bus_get_device(handle, &device) && device) {
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kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
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}
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break;
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default:
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break;
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}
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return;
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}
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static acpi_status
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container_walk_namespace_cb(acpi_handle handle,
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u32 lvl, void *context, void **rv)
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{
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char *hid = NULL;
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struct acpi_device_info *info;
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acpi_status status;
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int *action = context;
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status = acpi_get_object_info(handle, &info);
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if (ACPI_FAILURE(status)) {
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return AE_OK;
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}
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if (info->valid & ACPI_VALID_HID)
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hid = info->hardware_id.string;
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if (hid == NULL) {
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goto end;
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}
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if (strcmp(hid, "ACPI0004") && strcmp(hid, "PNP0A05") &&
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strcmp(hid, "PNP0A06")) {
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goto end;
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}
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switch (*action) {
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case INSTALL_NOTIFY_HANDLER:
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acpi_install_notify_handler(handle,
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ACPI_SYSTEM_NOTIFY,
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container_notify_cb, NULL);
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break;
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case UNINSTALL_NOTIFY_HANDLER:
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acpi_remove_notify_handler(handle,
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ACPI_SYSTEM_NOTIFY,
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container_notify_cb);
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break;
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default:
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break;
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}
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end:
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kfree(info);
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return AE_OK;
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}
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static int __init acpi_container_init(void)
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{
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int result = 0;
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int action = INSTALL_NOTIFY_HANDLER;
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result = acpi_bus_register_driver(&acpi_container_driver);
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if (result < 0) {
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return (result);
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}
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/* register notify handler to every container device */
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acpi_walk_namespace(ACPI_TYPE_DEVICE,
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ACPI_ROOT_OBJECT,
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ACPI_UINT32_MAX,
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container_walk_namespace_cb, &action, NULL);
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return (0);
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}
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static void __exit acpi_container_exit(void)
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{
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int action = UNINSTALL_NOTIFY_HANDLER;
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acpi_walk_namespace(ACPI_TYPE_DEVICE,
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ACPI_ROOT_OBJECT,
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ACPI_UINT32_MAX,
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container_walk_namespace_cb, &action, NULL);
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acpi_bus_unregister_driver(&acpi_container_driver);
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return;
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}
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module_init(acpi_container_init);
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module_exit(acpi_container_exit);
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