Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758828Ab3FMQgN (ORCPT ); Thu, 13 Jun 2013 12:36:13 -0400 Received: from mail-pb0-f54.google.com ([209.85.160.54]:46822 "EHLO mail-pb0-f54.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756078Ab3FMQgK (ORCPT ); Thu, 13 Jun 2013 12:36:10 -0400 From: Jiang Liu To: "Rafael J . Wysocki" , Bjorn Helgaas , Yinghai Lu , "Alexander E . Patrakov" Cc: Jiang Liu , Greg Kroah-Hartman , Yijing Wang , Jiang Liu , linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [BUGFIX 8/9] ACPI: introduce several helper functions Date: Fri, 14 Jun 2013 00:32:31 +0800 Message-Id: <1371141152-9468-9-git-send-email-jiang.liu@huawei.com> X-Mailer: git-send-email 1.8.1.2 In-Reply-To: <1371141152-9468-1-git-send-email-jiang.liu@huawei.com> References: <1371141152-9468-1-git-send-email-jiang.liu@huawei.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3355 Lines: 114 Introduce several helper functions, which will be used to simplify code. Signed-off-by: Jiang Liu --- 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 -- 1.8.1.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/