Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754332Ab3IXJrQ (ORCPT ); Tue, 24 Sep 2013 05:47:16 -0400 Received: from mga03.intel.com ([143.182.124.21]:13092 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754185Ab3IXJrM (ORCPT ); Tue, 24 Sep 2013 05:47:12 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.90,969,1371106800"; d="scan'208";a="364767694" From: Aaron Lu To: linux-acpi@vger.kernel.org, intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org Cc: Daniel Vetter , "Rafael J. Wysocki" , Matthew Garrett , Seth Forshee , Lee Chun-Yi , Richard Purdie , Igor Gnatenko , Yves-Alexis Perez , Felipe Contreras , Henrique de Moraes Holschuh , Jani Nikula , Aaron Lu , Ben Jencks , Steven Newbury , James Hogan , Kamal Mostafa , Joerg Platte , Kalle Valo , Martin Steigerwald , =?UTF-8?q?J=C3=B6rg=20Otte?= , Mike Galbraith Subject: [PATCH v3 4/4] thinkpad-acpi: fix handle locate for video and query of _BCL Date: Tue, 24 Sep 2013 17:47:32 +0800 Message-Id: <1380016052-15315-5-git-send-email-aaron.lu@intel.com> X-Mailer: git-send-email 1.8.4.12.g2ea3df6 In-Reply-To: <1380016052-15315-1-git-send-email-aaron.lu@intel.com> References: <1380016052-15315-1-git-send-email-aaron.lu@intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3748 Lines: 104 The tpacpi_acpi_handle_locate function makes use of acpi_get_devices to locate handle for ACPI video by HID, the problem is, ACPI video node doesn't really have HID defined(i.e. no _HID control method is defined for video device), so.. that function would fail. This can be solved by enhancing the callback function for acpi_get_devices, where we can use acpi_device_hid function to check if the ACPI node corresponds to a video controller. In addition to that, the _BCL control method only exists under a video output device node, not a video controller device node. So to evaluate _BCL, we need the handle of a video output device node, which is child of the located video controller node from tpacpi_acpi_handle_locate. The two fix are necessary for some Thinkpad models to emit notification on backlight hotkey press as a result of evaluation of _BCL. Signed-off-by: Aaron Lu Tested-by: Igor Gnatenko --- drivers/platform/x86/thinkpad_acpi.c | 31 ++++++++++++++++++++++++------- 1 file changed, 24 insertions(+), 7 deletions(-) diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c index 03ca6c1..170f278 100644 --- a/drivers/platform/x86/thinkpad_acpi.c +++ b/drivers/platform/x86/thinkpad_acpi.c @@ -700,6 +700,14 @@ static void __init drv_acpi_handle_init(const char *name, static acpi_status __init tpacpi_acpi_handle_locate_callback(acpi_handle handle, u32 level, void *context, void **return_value) { + struct acpi_device *dev; + if (!strcmp(context, "video")) { + if (acpi_bus_get_device(handle, &dev)) + return AE_OK; + if (strcmp(ACPI_VIDEO_HID, acpi_device_hid(dev))) + return AE_OK; + } + *(acpi_handle *)return_value = handle; return AE_CTRL_TERMINATE; @@ -712,10 +720,10 @@ static void __init tpacpi_acpi_handle_locate(const char *name, acpi_status status; acpi_handle device_found; - BUG_ON(!name || !hid || !handle); + BUG_ON(!name || !handle); vdbg_printk(TPACPI_DBG_INIT, "trying to locate ACPI handle for %s, using HID %s\n", - name, hid); + name, hid ? hid : "NULL"); memset(&device_found, 0, sizeof(device_found)); status = acpi_get_devices(hid, tpacpi_acpi_handle_locate_callback, @@ -6090,19 +6098,28 @@ static int __init tpacpi_query_bcl_levels(acpi_handle handle) { struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; union acpi_object *obj; + struct acpi_device *device, *child; int rc; - if (ACPI_SUCCESS(acpi_evaluate_object(handle, "_BCL", NULL, &buffer))) { + if (acpi_bus_get_device(handle, &device)) + return 0; + + rc = 0; + list_for_each_entry(child, &device->children, node) { + acpi_status status = acpi_evaluate_object(child->handle, "_BCL", + NULL, &buffer); + if (ACPI_FAILURE(status)) + continue; + obj = (union acpi_object *)buffer.pointer; if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) { pr_err("Unknown _BCL data, please report this to %s\n", - TPACPI_MAIL); + TPACPI_MAIL); rc = 0; } else { rc = obj->package.count; } - } else { - return 0; + break; } kfree(buffer.pointer); @@ -6118,7 +6135,7 @@ static unsigned int __init tpacpi_check_std_acpi_brightness_support(void) acpi_handle video_device; int bcl_levels = 0; - tpacpi_acpi_handle_locate("video", ACPI_VIDEO_HID, &video_device); + tpacpi_acpi_handle_locate("video", NULL, &video_device); if (video_device) bcl_levels = tpacpi_query_bcl_levels(video_device); -- 1.8.4.12.g2ea3df6 -- 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/