lkml.org 
[lkml]   [2019]   [Jul]   [23]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v3 5/7] drivers: Introduce device lookup variants by ACPI_COMPANION device
Date
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>
---
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
\
 
 \ /
  Last update: 2019-07-24 00:23    [W:0.059 / U:6.156 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site