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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>
This commit is contained in:
Daniel Scally 2021-01-07 14:28:36 +01:00 committed by Mauro Carvalho Chehab
parent 06c8523312
commit bf263f64e8
2 changed files with 38 additions and 9 deletions
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40
drivers/acpi/utils.c
View File

@ -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);

7
include/acpi/acpi_bus.h
View File

@ -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);