Re: [PATCH v3 5/7] drivers: Introduce device lookup variants by ACPI_COMPANION device

[Andy Shevchenko <andriy.shevchenko@linux.intel.com>]

On Fri, Jul 26, 2019 at 10:23:54PM +0200, Wolfram Sang wrote:
> 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 <lenb@kernel.org>
> > Cc: linux-acpi@vger.kernel.org
> > Cc: linux-spi@vger.kernel.org
> > Cc: Mark Brown <broonie@kernel.org>
> > Cc: Mika Westerberg <mika.westerberg@linux.intel.com>
> > Cc: Wolfram Sang <wsa@the-dreams.de>
> > Cc: linux-i2c@vger.kernel.org
> > Cc: Mark Brown <broonie@kernel.org>
> > Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> > Cc: "Rafael J. Wysocki" <rafael@kernel.org>
> > Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
> 
> From my side, OK:
> 
> Acked-by: Wolfram Sang <wsa@the-dreams.de> # I2C parts
> 
> yet you missed to cc the I2C ACPI maintainers. Done so now.

Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

Thanks, Wolfram, for notifying.

> 
> > ---
> >  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
> > 



-- 
With Best Regards,
Andy Shevchenko