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Subject[PATCH 3.12 38/86] platform/x86: acer-wmi: setup accelerometer when machine has appropriate notify event
Date
From: Chun-Yi Lee <joeyli.kernel@gmail.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@mork.no>
Cc: Darren Hart <dvhart@infradead.org>
Signed-off-by: Chun-Yi Lee <jlee@suse.com>
[andy: slightly massage commit message]
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Jiri Slaby <jslaby@suse.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
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