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

From: Wolfram Sang <[email-masked]>
Date: Fri, 26 Jul 2019 22:23:54 +0200

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 <[email-masked]>
> Cc: [email-masked]
> Cc: [email-masked]
> Cc: Mark Brown <[email-masked]>
> Cc: Mika Westerberg <[email-masked]>
> Cc: Wolfram Sang <[email-masked]>
> Cc: [email-masked]
> Cc: Mark Brown <[email-masked]>
> Cc: Greg Kroah-Hartman <[email-masked]>
> Cc: "Rafael J. Wysocki" <[email-masked]>
> Signed-off-by: Suzuki K Poulose <[email-masked]>

From my side, OK:

Acked-by: Wolfram Sang <[email-masked]> # 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
> 
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