On Tue, Jul 23, 2019 at 11:18:36PM +0100, Suzuki K Poulose wrote: > Add a generic helper to match a device by the ACPI_COMPANION device > and provide wrappers for the device lookup APIs. > > Cc: Len Brown > Cc: linux-acpi@vger.kernel.org > Cc: linux-spi@vger.kernel.org > Cc: Mark Brown > Cc: Mika Westerberg > Cc: Wolfram Sang > Cc: linux-i2c@vger.kernel.org > Cc: Mark Brown > Cc: Greg Kroah-Hartman > Cc: "Rafael J. Wysocki" > Signed-off-by: Suzuki K Poulose From my side, OK: Acked-by: Wolfram Sang # I2C parts yet you missed to cc the I2C ACPI maintainers. Done so now. > --- > drivers/base/core.c | 6 ++++ > drivers/i2c/i2c-core-acpi.c | 11 ++----- > drivers/spi/spi.c | 8 +---- > include/linux/device.h | 65 +++++++++++++++++++++++++++++++++++++ > 4 files changed, 74 insertions(+), 16 deletions(-) > > diff --git a/drivers/base/core.c b/drivers/base/core.c > index 3abc32b60c0a..57d71bc2c559 100644 > --- a/drivers/base/core.c > +++ b/drivers/base/core.c > @@ -3373,3 +3373,9 @@ int device_match_devt(struct device *dev, const void *pdevt) > return dev->devt == *(dev_t *)pdevt; > } > EXPORT_SYMBOL_GPL(device_match_devt); > + > +int device_match_acpi_dev(struct device *dev, const void *adev) > +{ > + return ACPI_COMPANION(dev) == adev; > +} > +EXPORT_SYMBOL(device_match_acpi_dev); > diff --git a/drivers/i2c/i2c-core-acpi.c b/drivers/i2c/i2c-core-acpi.c > index 4dbbc9a35f65..bc80aafb521f 100644 > --- a/drivers/i2c/i2c-core-acpi.c > +++ b/drivers/i2c/i2c-core-acpi.c > @@ -354,17 +354,11 @@ static int i2c_acpi_find_match_adapter(struct device *dev, const void *data) > return ACPI_HANDLE(dev) == (acpi_handle)data; > } > > -static int i2c_acpi_find_match_device(struct device *dev, const void *data) > -{ > - return ACPI_COMPANION(dev) == data; > -} > > struct i2c_adapter *i2c_acpi_find_adapter_by_handle(acpi_handle handle) > { > - struct device *dev; > + struct device *dev = bus_find_device_by_acpi_dev(&i2c_bus_type, handle); > > - dev = bus_find_device(&i2c_bus_type, NULL, handle, > - i2c_acpi_find_match_adapter); > return dev ? i2c_verify_adapter(dev) : NULL; > } > EXPORT_SYMBOL_GPL(i2c_acpi_find_adapter_by_handle); > @@ -373,8 +367,7 @@ static struct i2c_client *i2c_acpi_find_client_by_adev(struct acpi_device *adev) > { > struct device *dev; > > - dev = bus_find_device(&i2c_bus_type, NULL, adev, > - i2c_acpi_find_match_device); > + dev = bus_find_device_by_acpi_dev(&i2c_bus_type, adev); > return dev ? i2c_verify_client(dev) : NULL; > } > > diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c > index a591da87981a..c486a6f84c2c 100644 > --- a/drivers/spi/spi.c > +++ b/drivers/spi/spi.c > @@ -3741,11 +3741,6 @@ static int spi_acpi_controller_match(struct device *dev, const void *data) > return ACPI_COMPANION(dev->parent) == data; > } > > -static int spi_acpi_device_match(struct device *dev, const void *data) > -{ > - return ACPI_COMPANION(dev) == data; > -} > - > static struct spi_controller *acpi_spi_find_controller_by_adev(struct acpi_device *adev) > { > struct device *dev; > @@ -3765,8 +3760,7 @@ static struct spi_device *acpi_spi_find_device_by_adev(struct acpi_device *adev) > { > struct device *dev; > > - dev = bus_find_device(&spi_bus_type, NULL, adev, spi_acpi_device_match); > - > + dev = bus_find_device_by_acpi_dev(&spi_bus_type, adev); > return dev ? to_spi_device(dev) : NULL; > } > > diff --git a/include/linux/device.h b/include/linux/device.h > index 93b2f55ef44e..7514ef3d3f1a 100644 > --- a/include/linux/device.h > +++ b/include/linux/device.h > @@ -168,6 +168,7 @@ int device_match_name(struct device *dev, const void *name); > int device_match_of_node(struct device *dev, const void *np); > int device_match_fwnode(struct device *dev, const void *fwnode); > int device_match_devt(struct device *dev, const void *pdevt); > +int device_match_acpi_dev(struct device *dev, const void *adev); > > int bus_for_each_dev(struct bus_type *bus, struct device *start, void *data, > int (*fn)(struct device *dev, void *data)); > @@ -224,6 +225,28 @@ static inline struct device *bus_find_device_by_devt(struct bus_type *bus, > return bus_find_device(bus, NULL, &devt, device_match_devt); > } > > +#ifdef CONFIG_ACPI > +struct acpi_device; > + > +/** > + * bus_find_device_by_acpi_dev : device iterator for locating a particular device > + * matching the ACPI COMPANION device. > + * @bus: bus type > + * @adev: ACPI COMPANION device to match. > + */ > +static inline struct device * > +bus_find_device_by_acpi_dev(struct bus_type *bus, const struct acpi_device *adev) > +{ > + return bus_find_device(bus, NULL, adev, device_match_acpi_dev); > +} > +#else > +static inline struct device * > +bus_find_device_by_acpi_dev(struct bus_type *bus, const void *adev) > +{ > + return NULL; > +} > +#endif > + > struct device *subsys_find_device_by_id(struct bus_type *bus, unsigned int id, > struct device *hint); > int bus_for_each_drv(struct bus_type *bus, struct device_driver *start, > @@ -442,6 +465,27 @@ static inline struct device *driver_find_device_by_devt(struct device_driver *dr > return driver_find_device(drv, NULL, &devt, device_match_devt); > } > > +#ifdef CONFIG_ACPI > +/** > + * driver_find_device_by_acpi_dev : device iterator for locating a particular > + * device matching the ACPI_COMPANION device. > + * @driver: the driver we're iterating > + * @adev: ACPI_COMPANION device to match. > + */ > +static inline struct device * > +driver_find_device_by_acpi_dev(struct device_driver *drv, > + const struct acpi_device *adev) > +{ > + return driver_find_device(drv, NULL, adev, device_match_acpi_dev); > +} > +#else > +static inline struct device * > +driver_find_device_by_acpi_dev(struct device_driver *drv, const void *adev) > +{ > + return NULL; > +} > +#endif > + > void driver_deferred_probe_add(struct device *dev); > int driver_deferred_probe_check_state(struct device *dev); > int driver_deferred_probe_check_state_continue(struct device *dev); > @@ -620,6 +664,27 @@ static inline struct device *class_find_device_by_devt(struct class *class, > return class_find_device(class, NULL, &devt, device_match_devt); > } > > +#ifdef CONFIG_ACPI > +struct acpi_device; > +/** > + * class_find_device_by_acpi_dev : device iterator for locating a particular > + * device matching the ACPI_COMPANION device. > + * @class: class type > + * @adev: ACPI_COMPANION device to match. > + */ > +static inline struct device * > +class_find_device_by_acpi_dev(struct class *class, const struct acpi_device *adev) > +{ > + return class_find_device(class, NULL, adev, device_match_acpi_dev); > +} > +#else > +static inline struct device * > +class_find_device_by_acpi_dev(struct class *class, const void *adev) > +{ > + return NULL; > +} > +#endif > + > struct class_attribute { > struct attribute attr; > ssize_t (*show)(struct class *class, struct class_attribute *attr, > -- > 2.21.0 >