Commit 2aa1e462 authored by Rafael J. Wysocki's avatar Rafael J. Wysocki
Browse files

ACPI: sysfs: Add device cid attribute for exposing _CID lists 



Add a new sysfs attribute called "cid" under struct acpi_device for
exposing the list of compatible device IDs returned by the device's
_CID object, if present.

The new attribute will be present only if the _CID object is present.

Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: default avatarAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://patch.msgid.link/5957407.DvuYhMxLoT@rafael.j.wysocki
parent f8f9c1f4

drivers/acpi/device_sysfs.c

+31 −0
Original line number Diff line number Diff line
@@ -403,6 +403,33 @@ hid_show(struct device *dev, struct device_attribute *attr, char *buf) 
}

static DEVICE_ATTR_RO(hid);



static ssize_t cid_show(struct device *dev, struct device_attribute *attr,

			char *buf)

{

	struct acpi_device *acpi_dev = to_acpi_device(dev);

	struct acpi_device_info *info = NULL;

	ssize_t len = 0;



	acpi_get_object_info(acpi_dev->handle, &info);

	if (!info)

		return 0;



	if (info->valid & ACPI_VALID_CID) {

		struct acpi_pnp_device_id_list *cid_list = &info->compatible_id_list;

		int i;



		for (i = 0; i < cid_list->count - 1; i++)

			len += sysfs_emit_at(buf, len, "%s,", cid_list->ids[i].string);



		len += sysfs_emit_at(buf, len, "%s\n", cid_list->ids[i].string);

	}



	kfree(info);



	return len;

}

static DEVICE_ATTR_RO(cid);



static ssize_t uid_show(struct device *dev,

			struct device_attribute *attr, char *buf)

{
@@ -520,6 +547,7 @@ static DEVICE_ATTR_RO(status); 
static struct attribute *acpi_attrs[] = {

	&dev_attr_path.attr,

	&dev_attr_hid.attr,

	&dev_attr_cid.attr,

	&dev_attr_modalias.attr,

	&dev_attr_description.attr,

	&dev_attr_adr.attr,
@@ -562,6 +590,9 @@ static bool acpi_show_attr(struct acpi_device *dev, const struct device_attribut 
	if (attr == &dev_attr_status)

		return acpi_has_method(dev->handle, "_STA");



	if (attr == &dev_attr_cid)

		return acpi_has_method(dev->handle, "_CID");



	/*

	 * If device has _EJ0, 'eject' file is created that is used to trigger

	 * hot-removal function from userland.