ACPI / container: Use common hotplug code (68a67f6c) · Commits · e / devices / android_kernel_fairphone_FP4

drivers/acpi/container.c

+10 −136

Original line number	Diff line number	Diff line
		/*
		* 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);
		}