ACPI: Add user space interface for identification objects
ACPI devices are glued with physical devices through _ADR object, ACPI enumerated devices are identified with _UID object. Currently we can observe _HID/_CID through sysfs interfaces (hid/modalias), but there's no way for us to check _ADR/_UID from user space. This patch closes this gap for ACPI developers and users. [rjw: Modified the subject and changelog slightly.] Signed-off-by: Lv Zheng <lv.zheng@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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@ -220,6 +220,25 @@ acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *bu
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}
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static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
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static ssize_t acpi_device_uid_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct acpi_device *acpi_dev = to_acpi_device(dev);
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return sprintf(buf, "%s\n", acpi_dev->pnp.unique_id);
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}
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static DEVICE_ATTR(uid, 0444, acpi_device_uid_show, NULL);
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static ssize_t acpi_device_adr_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct acpi_device *acpi_dev = to_acpi_device(dev);
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return sprintf(buf, "0x%08x\n",
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(unsigned int)(acpi_dev->pnp.bus_address));
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}
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static DEVICE_ATTR(adr, 0444, acpi_device_adr_show, NULL);
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static ssize_t
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acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
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struct acpi_device *acpi_dev = to_acpi_device(dev);
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@ -304,6 +323,11 @@ static int acpi_device_setup_files(struct acpi_device *dev)
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goto end;
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}
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if (dev->flags.bus_address)
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result = device_create_file(&dev->dev, &dev_attr_adr);
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if (dev->pnp.unique_id)
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result = device_create_file(&dev->dev, &dev_attr_uid);
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/*
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* If device has _EJ0, 'eject' file is created that is used to trigger
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* hot-removal function from userland.
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@ -335,6 +359,10 @@ static void acpi_device_remove_files(struct acpi_device *dev)
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if (ACPI_SUCCESS(status))
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device_remove_file(&dev->dev, &dev_attr_eject);
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if (dev->pnp.unique_id)
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device_remove_file(&dev->dev, &dev_attr_uid);
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if (dev->flags.bus_address)
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device_remove_file(&dev->dev, &dev_attr_adr);
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device_remove_file(&dev->dev, &dev_attr_modalias);
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device_remove_file(&dev->dev, &dev_attr_hid);
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if (dev->handle)
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