platform/x86: huawei-wmi: Add debugfs support

Add a debugfs interface that can be used to call the WMI management
interface function if available.

Signed-off-by: Ayman Bagabas <ayman.bagabas@gmail.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

diff --git a/drivers/platform/x86/huawei-wmi.c b/drivers/platform/x86/huawei-wmi.c
index d550c63..6720f78 100644 (file)
--- 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>
@@ -52,10 +53,16 @@ struct quirk_entry {
 
 static struct quirk_entry *quirks;
 
+struct huawei_wmi_debug {
+       struct dentry *root;
+       u64 arg;
+};
+
 struct huawei_wmi {
        bool battery_available;
        bool fn_lock_available;
 
+       struct huawei_wmi_debug debug;
        struct input_dev *idev[2];
        struct led_classdev cdev;
        struct platform_device *pdev;
@@ -592,6 +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)
@@ -717,6 +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;
@@ -734,6 +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);
        }