linux-kernel - [BUGFIX 8/9] ACPI: introduce several helper functions

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1371141152-9468-9-git-send-email-jiang.liu@huawei.com>
Date:	Fri, 14 Jun 2013 00:32:31 +0800
From:	Jiang Liu <jiang.liu@...wei.com>
To:	"Rafael J . Wysocki" <rjw@...k.pl>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Yinghai Lu <yinghai@...nel.org>,
	"Alexander E . Patrakov" <patrakov@...il.com>
Cc:	Jiang Liu <jiang.liu@...wei.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Yijing Wang <wangyijing@...wei.com>,
	Jiang Liu <liuj97@...il.com>, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [BUGFIX 8/9] ACPI: introduce several helper functions

Introduce several helper functions, which will be used to simplify code.

Signed-off-by: Jiang Liu <jiang.liu@...wei.com>
---
 drivers/acpi/utils.c    | 74 +++++++++++++++++++++++++++++++++++++++++++++++++
 include/acpi/acpi_bus.h |  5 ++++
 2 files changed, 79 insertions(+)

diff --git a/drivers/acpi/utils.c b/drivers/acpi/utils.c
index 74437130..cb66fce 100644
--- a/drivers/acpi/utils.c
+++ b/drivers/acpi/utils.c
@@ -495,3 +495,77 @@ acpi_handle_printk(const char *level, acpi_handle handle, const char *fmt, ...)
 	kfree(buffer.pointer);
 }
 EXPORT_SYMBOL(acpi_handle_printk);
+
+/**
+ * acpi_evaluate_ej0: Evaluate _EJ0 method for hotplug operations
+ * @handle: ACPI device handle
+ *
+ * Evaluate device's _EJ0 method for hotplug operations.
+ */
+acpi_status acpi_evaluate_ej0(acpi_handle handle)
+{
+	acpi_status status;
+	union acpi_object arg;
+	struct acpi_object_list arg_list;
+
+	arg.type = ACPI_TYPE_INTEGER;
+	arg.integer.value = 1;
+	arg_list.count = 1;
+	arg_list.pointer = &arg;
+	status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
+	if (status == AE_NOT_FOUND) {
+		acpi_handle_warn(handle, "No _EJ0 support for device\n");
+	} else if (ACPI_FAILURE(status)) {
+		acpi_handle_warn(handle, "Eject failed (0x%x)\n", status);
+	}
+
+	return status;
+}
+
+/**
+ * acpi_evaluate_lck: Evaluate _LCK method to lock/unlock device
+ * @handle: ACPI device handle
+ * @lock: lock device if non-zero, otherwise unlock device
+ *
+ * Evaluate device's _LCK method if present to lock/unlock device
+ */
+acpi_status acpi_evaluate_lck(acpi_handle handle, int lock)
+{
+	acpi_status status;
+	union acpi_object arg;
+	struct acpi_object_list arg_list;
+
+	arg_list.count = 1;
+	arg_list.pointer = &arg;
+	arg.type = ACPI_TYPE_INTEGER;
+	arg.integer.value = !!lock;
+	status = acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
+	if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
+		if (lock)
+			acpi_handle_warn(handle,
+				"Locking device failed (0x%x)\n", status);
+		else
+			acpi_handle_warn(handle,
+				"Unlocking device failed (0x%x)\n", status);
+	}
+
+	return status;
+}
+
+/**
+ * acpi_has_method: Check whether @handle has a method named @name
+ * @handle: ACPI device handle
+ * @name: name of object or method
+ *
+ * Check whether @handle has a method named @name.
+ */
+int acpi_has_method(acpi_handle handle, char *name)
+{
+	acpi_status status;
+	acpi_handle tmp;
+
+	status = acpi_get_handle(handle, name, &tmp);
+
+	return ACPI_FAILURE(status) ? 0 : 1;
+}
+EXPORT_SYMBOL(acpi_has_method);
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index 636c59f..5df5f89 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -56,6 +56,11 @@ acpi_evaluate_hotplug_ost(acpi_handle handle, u32 source_event,
 
 acpi_status
 acpi_get_physical_device_location(acpi_handle handle, struct acpi_pld_info **pld);
+
+acpi_status acpi_evaluate_ej0(acpi_handle handle);
+acpi_status acpi_evaluate_lck(acpi_handle handle, int lock);
+int acpi_has_method(acpi_handle handle, char *name);
+
 #ifdef CONFIG_ACPI
 
 #include <linux/proc_fs.h>
-- 
1.8.1.2

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/