| Message ID | 20201130133129.1024662-13-djrscally@gmail.com |
|---|---|
| State | New |
| Headers | show |
| Series | Add functionality to ipu3-cio2 driver allowing software_node connections to sensors on platforms designed for Windows | expand |
On Mon, Nov 30, 2020 at 01:31:23PM +0000, Daniel Scally wrote: > 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> > --- > Changes since RFC v3: > > - Patch introduced > > drivers/acpi/utils.c | 30 ++++++++++++++++++++++++++---- > include/acpi/acpi_bus.h | 7 +++++++ > 2 files changed, 33 insertions(+), 4 deletions(-) > > diff --git a/drivers/acpi/utils.c b/drivers/acpi/utils.c > index d5411a166685..c177165c8db2 100644 > --- a/drivers/acpi/utils.c > +++ b/drivers/acpi/utils.c > @@ -843,12 +843,13 @@ bool acpi_dev_present(const char *hid, const char *uid, s64 hrv) > EXPORT_SYMBOL(acpi_dev_present); > > /** > - * acpi_dev_get_first_match_dev - Return the first match of ACPI device > + * 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 first match of ACPI device if a matching device was present > + * 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. > @@ -856,8 +857,9 @@ EXPORT_SYMBOL(acpi_dev_present); > * See additional information in acpi_dev_present() as well. > */ > struct acpi_device * > -acpi_dev_get_first_match_dev(const char *hid, const char *uid, s64 hrv) > +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; > > @@ -865,9 +867,29 @@ acpi_dev_get_first_match_dev(const char *hid, const char *uid, s64 hrv) > match.uid = uid; > match.hrv = hrv; > > - dev = bus_find_device(&acpi_bus_type, NULL, &match, acpi_dev_match_cb); > + 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. > + * @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 first match of ACPI device if a 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_first_match_dev(const char *hid, const char *uid, s64 hrv) > +{ > + 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 a3abcc4b7d9f..0a028ba967d3 100644 > --- a/include/acpi/acpi_bus.h > +++ b/include/acpi/acpi_bus.h > @@ -688,9 +688,16 @@ 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); > -- > 2.25.1 >
diff --git a/drivers/acpi/utils.c b/drivers/acpi/utils.c index d5411a166685..c177165c8db2 100644 --- a/drivers/acpi/utils.c +++ b/drivers/acpi/utils.c @@ -843,12 +843,13 @@ bool acpi_dev_present(const char *hid, const char *uid, s64 hrv) EXPORT_SYMBOL(acpi_dev_present); /** - * acpi_dev_get_first_match_dev - Return the first match of ACPI device + * 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 first match of ACPI device if a matching device was present + * 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. @@ -856,8 +857,9 @@ EXPORT_SYMBOL(acpi_dev_present); * See additional information in acpi_dev_present() as well. */ struct acpi_device * -acpi_dev_get_first_match_dev(const char *hid, const char *uid, s64 hrv) +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; @@ -865,9 +867,29 @@ acpi_dev_get_first_match_dev(const char *hid, const char *uid, s64 hrv) match.uid = uid; match.hrv = hrv; - dev = bus_find_device(&acpi_bus_type, NULL, &match, acpi_dev_match_cb); + 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. + * @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 first match of ACPI device if a 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_first_match_dev(const char *hid, const char *uid, s64 hrv) +{ + 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 a3abcc4b7d9f..0a028ba967d3 100644 --- a/include/acpi/acpi_bus.h +++ b/include/acpi/acpi_bus.h @@ -688,9 +688,16 @@ 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);
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. Suggested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Daniel Scally <djrscally@gmail.com> --- Changes since RFC v3: - Patch introduced drivers/acpi/utils.c | 30 ++++++++++++++++++++++++++---- include/acpi/acpi_bus.h | 7 +++++++ 2 files changed, 33 insertions(+), 4 deletions(-)