diff --git a/drivers/acpi/utils.c b/drivers/acpi/utils.c index d5411a166685..ddca1550cce6 100644 --- a/drivers/acpi/utils.c +++ b/drivers/acpi/utils.c @@ -842,6 +842,36 @@ bool acpi_dev_present(const char *hid, const char *uid, s64 hrv) } EXPORT_SYMBOL(acpi_dev_present); +/** + * acpi_dev_get_next_match_dev - Return the next match of ACPI device + * @adev: Pointer to the previous acpi_device matching this @hid, @uid and @hrv + * @hid: Hardware ID of the device. + * @uid: Unique ID of the device, pass NULL to not check _UID + * @hrv: Hardware Revision of the device, pass -1 to not check _HRV + * + * Return the next match of ACPI device if another matching device was present + * at the moment of invocation, or NULL otherwise. + * + * The caller is responsible to call put_device() on the returned device. + * + * See additional information in acpi_dev_present() as well. + */ +struct acpi_device * +acpi_dev_get_next_match_dev(struct acpi_device *adev, const char *hid, const char *uid, s64 hrv) +{ + struct device *start = adev ? &adev->dev : NULL; + struct acpi_dev_match_info match = {}; + struct device *dev; + + strlcpy(match.hid[0].id, hid, sizeof(match.hid[0].id)); + match.uid = uid; + match.hrv = hrv; + + dev = bus_find_device(&acpi_bus_type, start, &match, acpi_dev_match_cb); + return dev ? to_acpi_device(dev) : NULL; +} +EXPORT_SYMBOL(acpi_dev_get_next_match_dev); + /** * acpi_dev_get_first_match_dev - Return the first match of ACPI device * @hid: Hardware ID of the device. @@ -858,15 +888,7 @@ EXPORT_SYMBOL(acpi_dev_present); struct acpi_device * acpi_dev_get_first_match_dev(const char *hid, const char *uid, s64 hrv) { - struct acpi_dev_match_info match = {}; - struct device *dev; - - strlcpy(match.hid[0].id, hid, sizeof(match.hid[0].id)); - match.uid = uid; - match.hrv = hrv; - - dev = bus_find_device(&acpi_bus_type, NULL, &match, acpi_dev_match_cb); - return dev ? to_acpi_device(dev) : NULL; + return acpi_dev_get_next_match_dev(NULL, hid, uid, hrv); } EXPORT_SYMBOL(acpi_dev_get_first_match_dev); diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h index 6d1879bf9440..02a716a0af5d 100644 --- a/include/acpi/acpi_bus.h +++ b/include/acpi/acpi_bus.h @@ -683,9 +683,16 @@ static inline bool acpi_device_can_poweroff(struct acpi_device *adev) bool acpi_dev_hid_uid_match(struct acpi_device *adev, const char *hid2, const char *uid2); +struct acpi_device * +acpi_dev_get_next_match_dev(struct acpi_device *adev, const char *hid, const char *uid, s64 hrv); struct acpi_device * acpi_dev_get_first_match_dev(const char *hid, const char *uid, s64 hrv); +#define for_each_acpi_dev_match(adev, hid, uid, hrv) \ + for (adev = acpi_dev_get_first_match_dev(hid, uid, hrv); \ + adev; \ + adev = acpi_dev_get_next_match_dev(adev, hid, uid, hrv)) + static inline void acpi_dev_put(struct acpi_device *adev) { put_device(&adev->dev);