From bf263f64e804a74ace9bd37f49341d68a653e5e6 Mon Sep 17 00:00:00 2001
From: Daniel Scally <djrscally@gmail.com>
Date: Thu, 7 Jan 2021 14:28:36 +0100
Subject: media: ACPI / bus: Add acpi_dev_get_next_match_dev() and helper macro
To ensure we handle situations in which multiple sensors of the same
model (and therefore _HID) are present in a system, we need to be able
to iterate over devices matching a known _HID but unknown _UID and _HRV
- add acpi_dev_get_next_match_dev() to accommodate that possibility and
change acpi_dev_get_first_match_dev() to simply call the new function
with a NULL starting point. Add an iterator macro for convenience.
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Suggested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Daniel Scally <djrscally@gmail.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
---
include/acpi/acpi_bus.h | 7 +++++++
1 file changed, 7 insertions(+)
(limited to 'include/acpi')
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);
--
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