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

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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: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://patch.msgid.link/5957407.DvuYhMxLoT@rafael.j.wysocki
This commit is contained in:
Rafael J. Wysocki 2025-12-29 14:29:59 +01:00
parent f8f9c1f4d0
commit 2aa1e46250
1 changed files with 31 additions and 0 deletions
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31
drivers/acpi/device_sysfs.c
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@ -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.