A debugfs interface that creates two attributes `arg` and `call` to set an argument to be called by the WMI device and show the results returned. This argument is a 64 bit long which complies the properties of the HWMI interface.
Signed-off-by: Ayman Bagabas <[email protected]> --- drivers/platform/x86/huawei-wmi.c | 117 ++++++++++++++++++++++++++++++ 1 file changed, 117 insertions(+) diff --git a/drivers/platform/x86/huawei-wmi.c b/drivers/platform/x86/huawei-wmi.c index cc6745ff1bad..a74ddd9adb47 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> @@ -46,8 +47,14 @@ struct quirk_entry { static struct quirk_entry *quirks; +struct huawei_wmi_debug { + struct dentry *root; + u64 arg; +}; + struct huawei_wmi { struct led_classdev cdev; + struct huawei_wmi_debug debug; struct input_dev *idev[2]; struct mutex wmi_lock; struct mutex battery_lock; @@ -463,6 +470,110 @@ static struct attribute *huawei_wmi_attrs[] = { ATTRIBUTE_GROUPS(huawei_wmi); +/* 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_printf(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_printf(m, ","); + } + seq_printf(m, "}"); + break; + case ACPI_TYPE_PACKAGE: + seq_printf(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_printf(m, ","); + } + seq_printf(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(&huawei->pdev->dev, &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_exit(struct device *dev) +{ + struct huawei_wmi *huawei = dev_get_drvdata(dev); + + debugfs_remove_recursive(huawei->debug.root); +} + +static int huawei_wmi_debugfs_init(struct device *dev) +{ + struct huawei_wmi *huawei = dev_get_drvdata(dev); + struct dentry *dent; + + huawei->debug.root = debugfs_create_dir("huawei-wmi", NULL); + if (!huawei->debug.root) { + dev_err(dev, "Failed to create debugfs directory\n"); + goto fail_debugfs; + } + + dent = debugfs_create_x64("arg", S_IRUGO | S_IWUSR, huawei->debug.root, + &huawei->debug.arg); + if (!dent) + goto fail_debugfs; + + dent = debugfs_create_file("call", S_IFREG | S_IRUSR, + huawei->debug.root, huawei, &huawei_wmi_debugfs_call_fops); + if (!dent) + goto fail_debugfs; + + return 0; + +fail_debugfs: + huawei_wmi_debugfs_exit(dev); + return -ENOMEM; +} + /* Input */ static void huawei_wmi_process_key(struct input_dev *idev, int code) @@ -597,7 +708,12 @@ static int huawei_wmi_probe(struct platform_device *pdev) err = huawei_wmi_leds_setup(&pdev->dev); if (err) dev_err(&pdev->dev, "Failed to setup leds\n"); + + err = huawei_wmi_debugfs_init(&pdev->dev); + if (err) + dev_err(&pdev->dev, "Failed to setup debugfs\n"); } + return 0; } @@ -610,6 +726,7 @@ static int huawei_wmi_remove(struct platform_device *pdev) wmi_remove_notify_handler(HWMI_EVENT_GUID); if (wmi_has_guid(HWMI_METHOD_GUID)) { + huawei_wmi_debugfs_exit(&pdev->dev); sysfs_remove_group(&pdev->dev.kobj, &huawei_wmi_group); } -- 2.20.1
