[PATCH] acer-wmi: setup accelerometer when machine has appropriate notify event

[Lee, Chun-Yi]

The accelerometer event relies on 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 <bj...@mork.no>
Cc: Darren Hart <dvh...@infradead.org>
Signed-off-by: Lee, Chun-Yi <j...@suse.com>
---
 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 79d64ea..3bb3162 100644
--- a/drivers/platform/x86/acer-wmi.c
+++ b/drivers/platform/x86/acer-wmi.c
@@ -1808,11 +1808,24 @@ static int __init 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,
@@ -1839,7 +1852,7 @@ 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;
 
@@ -2177,10 +2190,11 @@ 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");
-- 
2.1.4