linux-kernel - [PATCH 3.12 38/86] platform/x86: acer-wmi: setup accelerometer when machine has appropriate notify event

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Message-Id: <d8d98430e95edda0ef2e2be92dcf486e56a71fca.1493888632.git.jslaby@suse.cz>
Date:   Thu,  4 May 2017 11:04:03 +0200
From:   Jiri Slaby <jslaby@...e.cz>
To:     stable@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        Chun-Yi Lee <joeyli.kernel@...il.com>,
        Darren Hart <dvhart@...radead.org>,
        Chun-Yi Lee <jlee@...e.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Ben Hutchings <ben@...adent.org.uk>,
        Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 38/86] platform/x86: acer-wmi: setup accelerometer when machine has appropriate notify event

From: Chun-Yi Lee <joeyli.kernel@...il.com>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit 98d610c3739ac354319a6590b915f4624d9151e6 upstream.

The accelerometer event relies on the ACERWMID_EVENT_GUID notify.
So, this patch changes the codes to setup accelerometer input device
when detected ACERWMID_EVENT_GUID. It avoids that the accel input
device created on every Acer machines.

In addition, patch adds a clearly parsing logic of accelerometer hid
to acer_wmi_get_handle_cb callback function. It is positive matching
the "SENR" name with "BST0001" device to avoid non-supported hardware.

Reported-by: Bjørn Mork <bjorn@...k.no>
Cc: Darren Hart <dvhart@...radead.org>
Signed-off-by: Chun-Yi Lee <jlee@...e.com>
[andy: slightly massage commit message]
Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc: Ben Hutchings <ben@...adent.org.uk>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 drivers/platform/x86/acer-wmi.c | 22 ++++++++++++++++++----
 1 file changed, 18 insertions(+), 4 deletions(-)

diff --git a/drivers/platform/x86/acer-wmi.c b/drivers/platform/x86/acer-wmi.c
index 59a8d325a697..9e4f87004257 100644
--- a/drivers/platform/x86/acer-wmi.c
+++ b/drivers/platform/x86/acer-wmi.c
@@ -1860,11 +1860,24 @@ static int acer_wmi_enable_lm(void)
 	return status;
 }
 
+#define ACER_WMID_ACCEL_HID	"BST0001"
+
 static acpi_status __init acer_wmi_get_handle_cb(acpi_handle ah, u32 level,
 						void *ctx, void **retval)
 {
+	struct acpi_device *dev;
+
+	if (!strcmp(ctx, "SENR")) {
+		if (acpi_bus_get_device(ah, &dev))
+			return AE_OK;
+		if (!strcmp(ACER_WMID_ACCEL_HID, acpi_device_hid(dev)))
+			return AE_OK;
+	} else
+		return AE_OK;
+
 	*(acpi_handle *)retval = ah;
-	return AE_OK;
+
+	return AE_CTRL_TERMINATE;
 }
 
 static int __init acer_wmi_get_handle(const char *name, const char *prop,
@@ -1891,7 +1904,7 @@ static int __init acer_wmi_accel_setup(void)
 {
 	int err;
 
-	err = acer_wmi_get_handle("SENR", "BST0001", &gsensor_handle);
+	err = acer_wmi_get_handle("SENR", ACER_WMID_ACCEL_HID, &gsensor_handle);
 	if (err)
 		return err;
 
@@ -2262,10 +2275,11 @@ static int __init acer_wmi_init(void)
 		err = acer_wmi_input_setup();
 		if (err)
 			return err;
+		err = acer_wmi_accel_setup();
+		if (err)
+			return err;
 	}
 
-	acer_wmi_accel_setup();
-
 	err = platform_driver_register(&acer_platform_driver);
 	if (err) {
 		pr_err("Unable to register platform driver\n");
-- 
2.12.2