Add a debugfs interface that can be used to call the WMI management
interface function if available.
Signed-off-by: Ayman Bagabas <ayman.baga...@gmail.com>
---
drivers/platform/x86/huawei-wmi.c | 91 +++++++++++++++++++++++++++++++
1 file changed, 91 insertions(+)
diff --git a/drivers/platform/x86/huawei-wmi.c
b/drivers/platform/x86/huawei-wmi.c
index 48be55c6027e..9ae2ecadeb10 100644
--- a/drivers/platform/x86/huawei-wmi.c
+++ b/drivers/platform/x86/huawei-wmi.c
@@ -6,6 +6,7 @@
*/
#include <linux/acpi.h>
+#include <linux/debugfs.h>
#include <linux/delay.h>
#include <linux/dmi.h>
#include <linux/input.h>
@@ -598,6 +599,94 @@ static void huawei_wmi_fn_lock_exit(struct device *dev)
device_remove_file(dev, &dev_attr_fn_lock_state);
}
+/* debugfs */
+
+static void huawei_wmi_debugfs_call_dump(struct seq_file *m, void *data,
+ union acpi_object *obj)
+{
+ struct huawei_wmi *huawei = m->private;
+ int i;
+
+ switch (obj->type) {
+ case ACPI_TYPE_INTEGER:
+ seq_printf(m, "0x%llx", obj->integer.value);
+ break;
+ case ACPI_TYPE_STRING:
+ seq_printf(m, "\"%*s\"", obj->string.length,
obj->string.pointer);
+ break;
+ case ACPI_TYPE_BUFFER:
+ seq_puts(m, "{");
+ for (i = 0; i < obj->buffer.length; i++) {
+ seq_printf(m, "0x%02x", obj->buffer.pointer[i]);
+ if (i < obj->buffer.length - 1)
+ seq_puts(m, ",");
+ }
+ seq_puts(m, "}");
+ break;
+ case ACPI_TYPE_PACKAGE:
+ seq_puts(m, "[");
+ for (i = 0; i < obj->package.count; i++) {
+ huawei_wmi_debugfs_call_dump(m, huawei,
&obj->package.elements[i]);
+ if (i < obj->package.count - 1)
+ seq_puts(m, ",");
+ }
+ seq_puts(m, "]");
+ break;
+ default:
+ dev_err(&huawei->pdev->dev, "Unexpected obj type, got %d\n",
obj->type);
+ return;
+ }
+}
+
+static int huawei_wmi_debugfs_call_show(struct seq_file *m, void *data)
+{
+ struct huawei_wmi *huawei = m->private;
+ struct acpi_buffer out = { ACPI_ALLOCATE_BUFFER, NULL };
+ struct acpi_buffer in;
+ union acpi_object *obj;
+ int err;
+
+ in.length = sizeof(u64);
+ in.pointer = &huawei->debug.arg;
+
+ err = huawei_wmi_call(&in, &out);
+ if (err)
+ return err;
+
+ obj = out.pointer;
+ if (!obj) {
+ err = -EIO;
+ goto fail_debugfs_call;
+ }
+
+ huawei_wmi_debugfs_call_dump(m, huawei, obj);
+
+fail_debugfs_call:
+ kfree(out.pointer);
+ return err;
+}
+
+DEFINE_SHOW_ATTRIBUTE(huawei_wmi_debugfs_call);
+
+static void huawei_wmi_debugfs_setup(struct device *dev)
+{
+ struct huawei_wmi *huawei = dev_get_drvdata(dev);
+
+ huawei->debug.root = debugfs_create_dir("huawei-wmi", NULL);
+
+ debugfs_create_x64("arg", 0644, huawei->debug.root,
+ &huawei->debug.arg);
+ debugfs_create_file("call", 0400,
+ huawei->debug.root, huawei, &huawei_wmi_debugfs_call_fops);
+}
+
+static void huawei_wmi_debugfs_exit(struct device *dev)
+{
+ struct huawei_wmi *huawei = dev_get_drvdata(dev);
+
+ debugfs_remove_recursive(huawei->debug.root);
+}
+
/* Input */
static void huawei_wmi_process_key(struct input_dev *idev, int code)
@@ -723,6 +812,7 @@ static int huawei_wmi_probe(struct platform_device *pdev)
huawei_wmi_leds_setup(&pdev->dev);
huawei_wmi_fn_lock_setup(&pdev->dev);
huawei_wmi_battery_setup(&pdev->dev);
+ huawei_wmi_debugfs_setup(&pdev->dev);
}
return 0;
@@ -740,6 +830,7 @@ static int huawei_wmi_remove(struct platform_device *pdev)
}
if (wmi_has_guid(HWMI_METHOD_GUID)) {
+ huawei_wmi_debugfs_exit(&pdev->dev);
huawei_wmi_battery_exit(&pdev->dev);
huawei_wmi_fn_lock_exit(&pdev->dev);
}
--
2.21.0
