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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>
This commit is contained in:
Ayman Bagabas 2019-09-23 22:48:11 -04:00 committed by Andy Shevchenko
parent 32e59d119d
commit 94930d0133
1 changed files with 97 additions and 0 deletions
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97
drivers/platform/x86/huawei-wmi.c
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@ -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);
}