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drivers: Introduce device lookup variants by ACPI_COMPANION device

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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: Mika Westerberg <mika.westerberg@linux.intel.com>
Cc: linux-i2c@vger.kernel.org
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Acked-by: Mark Brown <broonie@kernel.org>
Acked-by: Wolfram Sang <wsa@the-dreams.de> # I2C parts
Link: https://lore.kernel.org/r/20190723221838.12024-6-suzuki.poulose@arm.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Suzuki K Poulose 2019-07-23 23:18:36 +01:00 committed by Greg Kroah-Hartman
parent 4495dfdd61
commit 00500147cb
4 changed files with 74 additions and 16 deletions
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6
drivers/base/core.c
View File

@ -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);

11
drivers/i2c/i2c-core-acpi.c
View File

@ -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;
}

8
drivers/spi/spi.c
View File

@ -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;
}

65
include/linux/device.h
View File

@ -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,