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ACPI / container: Use common hotplug code

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Switch the ACPI container driver to using common device hotplug code
introduced previously.  This reduces the driver down to a trivial
definition and registration of a struct acpi_scan_handler object.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Toshi Kani <toshi.kani@hp.com>
Tested-by: Toshi Kani <toshi.kani@hp.com>
This commit is contained in:
Rafael J. Wysocki 2013-03-03 23:05:55 +01:00
parent a33ec399e9
commit 68a67f6c78
1 changed files with 10 additions and 136 deletions
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146
drivers/acpi/container.c
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@ -1,12 +1,12 @@
/*
* acpi_container.c - ACPI Generic Container Driver
* ($Revision: )
* container.c - ACPI Generic Container Driver
*
* Copyright (C) 2004 Anil S Keshavamurthy (anil.s.keshavamurthy@intel.com)
* Copyright (C) 2004 Keiichiro Tokunaga (tokunaga.keiich@jp.fujitsu.com)
* Copyright (C) 2004 Motoyuki Ito (motoyuki@soft.fujitsu.com)
* Copyright (C) 2004 Intel Corp.
* Copyright (C) 2004 FUJITSU LIMITED
* Copyright (C) 2004, 2013 Intel Corp.
* Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
@ -26,14 +26,9 @@
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/acpi.h>
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>
#include "internal.h"
#define PREFIX "ACPI: "
@ -50,141 +45,20 @@ static const struct acpi_device_id container_device_ids[] = {
static int container_device_attach(struct acpi_device *device,
const struct acpi_device_id *not_used)
{
/*
* FIXME: This is necessary, so that acpi_eject_store() doesn't return
* -ENODEV for containers.
*/
/* This is necessary for container hotplug to work. */
return 1;
}
static struct acpi_scan_handler container_device_handler = {
.ids = container_device_ids,
.attach = container_device_attach,
.hotplug = {
.enabled = true,
.mode = AHM_CONTAINER,
},
};
static int is_device_present(acpi_handle handle)
{
acpi_handle temp;
acpi_status status;
unsigned long long sta;
status = acpi_get_handle(handle, "_STA", &temp);
if (ACPI_FAILURE(status))
return 1; /* _STA not found, assume device present */
status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
if (ACPI_FAILURE(status))
return 0; /* Firmware error */
return ((sta & ACPI_STA_DEVICE_PRESENT) == ACPI_STA_DEVICE_PRESENT);
}
static void container_notify_cb(acpi_handle handle, u32 type, void *context)
{
struct acpi_device *device = NULL;
int result;
int present;
acpi_status status;
u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; /* default */
acpi_scan_lock_acquire();
switch (type) {
case ACPI_NOTIFY_BUS_CHECK:
/* Fall through */
case ACPI_NOTIFY_DEVICE_CHECK:
pr_debug("Container driver received %s event\n",
(type == ACPI_NOTIFY_BUS_CHECK) ?
"ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK");
present = is_device_present(handle);
status = acpi_bus_get_device(handle, &device);
if (!present) {
if (ACPI_SUCCESS(status)) {
/* device exist and this is a remove request */
device->flags.eject_pending = 1;
kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
goto out;
}
break;
}
if (!ACPI_FAILURE(status) || device)
break;
result = acpi_bus_scan(handle);
if (result) {
acpi_handle_warn(handle, "Failed to add container\n");
break;
}
result = acpi_bus_get_device(handle, &device);
if (result) {
acpi_handle_warn(handle, "Missing device object\n");
break;
}
kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);
ost_code = ACPI_OST_SC_SUCCESS;
break;
case ACPI_NOTIFY_EJECT_REQUEST:
if (!acpi_bus_get_device(handle, &device) && device) {
device->flags.eject_pending = 1;
kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
goto out;
}
break;
default:
/* non-hotplug event; possibly handled by other handler */
goto out;
}
/* Inform firmware that the hotplug operation has completed */
(void) acpi_evaluate_hotplug_ost(handle, type, ost_code, NULL);
out:
acpi_scan_lock_release();
}
static bool is_container(acpi_handle handle)
{
struct acpi_device_info *info;
bool ret = false;
if (ACPI_FAILURE(acpi_get_object_info(handle, &info)))
return false;
if (info->valid & ACPI_VALID_HID) {
const struct acpi_device_id *id;
for (id = container_device_ids; id->id[0]; id++) {
ret = !strcmp((char *)id->id, info->hardware_id.string);
if (ret)
break;
}
}
kfree(info);
return ret;
}
static acpi_status acpi_container_register_notify_handler(acpi_handle handle,
u32 lvl, void *ctxt,
void **retv)
{
if (is_container(handle))
acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
container_notify_cb, NULL);
return AE_OK;
}
void __init acpi_container_init(void)
{
acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, ACPI_UINT32_MAX,
acpi_container_register_notify_handler, NULL,
NULL, NULL);
acpi_scan_add_handler(&container_device_handler);
}