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    Subject[PATCH v4 6/6] platform/x86: huawei-wmi: Add debugfs support
    Date
    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>
    ---
    drivers/platform/x86/huawei-wmi.c | 97 +++++++++++++++++++++++++++++++
    1 file changed, 97 insertions(+)

    diff --git a/drivers/platform/x86/huawei-wmi.c b/drivers/platform/x86/huawei-wmi.c
    index 56697d49377d..5efb8d1bbda7 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>
    @@ -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);
    }
    --
    2.21.0
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