drivers: Introduce device lookup variants by ACPI_COMPANION device

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>

1 files changed, 65 insertions, 0 deletions

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,