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Subject[PATCH 04/14] fpga: region: change api, add fpga_region_create/free
Date
Add fpga_region_create/free API functions.

Change fpga_region_register to take FPGA region struct as the only
parameter. Change fpga_region_unregister to return void.

struct fpga_region *fpga_region_create(struct device *dev,
struct fpga_manager *mgr,
int (*get_bridges)(struct fpga_region *));
void fpga_region_free(struct fpga_region *region);
int fpga_region_register(struct fpga_region *region);
void fpga_region_unregister(struct fpga_region *region);

Remove groups storage from struct fpga_region, it's not
needed. Callers can just "region->dev.groups = groups;"
after calling fpga_region_create.

Update the drivers that call fpga_region_register with the new API.

Signed-off-by: Alan Tull <atull@kernel.org>
Signed-off-by: Moritz Fischer <mdf@kernel.org>
---
Documentation/fpga/fpga-region.txt | 3 +-
drivers/fpga/fpga-region.c | 68 ++++++++++++++++++++++++++++++--------
drivers/fpga/of-fpga-region.c | 13 +++-----
include/linux/fpga/fpga-region.h | 11 +++---
4 files changed, 68 insertions(+), 27 deletions(-)

diff --git a/Documentation/fpga/fpga-region.txt b/Documentation/fpga/fpga-region.txt
index 139a02b..d38fa3b 100644
--- a/Documentation/fpga/fpga-region.txt
+++ b/Documentation/fpga/fpga-region.txt
@@ -42,8 +42,7 @@ The FPGA region API
To register or unregister a region:
-----------------------------------

- int fpga_region_register(struct device *dev,
- struct fpga_region *region);
+ int fpga_region_register(struct fpga_region *region);
int fpga_region_unregister(struct fpga_region *region);

An example of usage can be seen in the probe function of [3]
diff --git a/drivers/fpga/fpga-region.c b/drivers/fpga/fpga-region.c
index f634a8e..b3ba3e40 100644
--- a/drivers/fpga/fpga-region.c
+++ b/drivers/fpga/fpga-region.c
@@ -167,18 +167,36 @@ int fpga_region_program_fpga(struct fpga_region *region)
}
EXPORT_SYMBOL_GPL(fpga_region_program_fpga);

-int fpga_region_register(struct device *dev, struct fpga_region *region)
+/**
+ * fpga_region_create - alloc and init a struct fpga_region
+ * @dev: device parent
+ * @mgr: manager that programs this region
+ * @get_bridges: optional function to get bridges to a list
+ *
+ * Return: struct fpga_region or NULL
+ */
+struct fpga_region
+*fpga_region_create(struct device *dev,
+ struct fpga_manager *mgr,
+ int (*get_bridges)(struct fpga_region *))
{
+ struct fpga_region *region;
int id, ret = 0;

+ region = kzalloc(sizeof(*region), GFP_KERNEL);
+ if (!region)
+ return NULL;
+
id = ida_simple_get(&fpga_region_ida, 0, 0, GFP_KERNEL);
if (id < 0)
- return id;
+ goto err_free;

+ region->mgr = mgr;
+ region->get_bridges = get_bridges;
mutex_init(&region->mutex);
INIT_LIST_HEAD(&region->bridge_list);
+
device_initialize(&region->dev);
- region->dev.groups = region->groups;
region->dev.class = fpga_region_class;
region->dev.parent = dev;
region->dev.of_node = dev->of_node;
@@ -188,23 +206,47 @@ int fpga_region_register(struct device *dev, struct fpga_region *region)
if (ret)
goto err_remove;

- ret = device_add(&region->dev);
- if (ret)
- goto err_remove;
-
- return 0;
+ return region;

err_remove:
ida_simple_remove(&fpga_region_ida, id);
- return ret;
+err_free:
+ kfree(region);
+
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(fpga_region_create);
+
+/**
+ * fpga_region_free - free a struct fpga_region
+ * @region: FPGA region created by fpga_region_create
+ */
+void fpga_region_free(struct fpga_region *region)
+{
+ ida_simple_remove(&fpga_region_ida, region->dev.id);
+ kfree(region);
+}
+EXPORT_SYMBOL_GPL(fpga_region_free);
+
+/*
+ * fpga_region_register - register a FPGA region
+ * @region: FPGA region created by fpga_region_create
+ * Return: 0 or -errno
+ */
+int fpga_region_register(struct fpga_region *region)
+{
+ return device_add(&region->dev);
+
}
EXPORT_SYMBOL_GPL(fpga_region_register);

-int fpga_region_unregister(struct fpga_region *region)
+/*
+ * fpga_region_unregister - unregister a FPGA region
+ * @region: FPGA region
+ */
+void fpga_region_unregister(struct fpga_region *region)
{
device_unregister(&region->dev);
-
- return 0;
}
EXPORT_SYMBOL_GPL(fpga_region_unregister);

@@ -212,7 +254,7 @@ static void fpga_region_dev_release(struct device *dev)
{
struct fpga_region *region = to_fpga_region(dev);

- ida_simple_remove(&fpga_region_ida, region->dev.id);
+ fpga_region_free(region);
}

/**
diff --git a/drivers/fpga/of-fpga-region.c b/drivers/fpga/of-fpga-region.c
index 35e7e8c..9d681a1 100644
--- a/drivers/fpga/of-fpga-region.c
+++ b/drivers/fpga/of-fpga-region.c
@@ -422,20 +422,15 @@ static int of_fpga_region_probe(struct platform_device *pdev)
if (IS_ERR(mgr))
return -EPROBE_DEFER;

- region = devm_kzalloc(dev, sizeof(*region), GFP_KERNEL);
+ region = fpga_region_create(dev, mgr, of_fpga_region_get_bridges);
if (!region) {
ret = -ENOMEM;
goto eprobe_mgr_put;
}

- region->mgr = mgr;
-
- /* Specify how to get bridges for this type of region. */
- region->get_bridges = of_fpga_region_get_bridges;
-
- ret = fpga_region_register(dev, region);
+ ret = fpga_region_register(region);
if (ret)
- goto eprobe_mgr_put;
+ goto eprobe_free;

of_platform_populate(np, fpga_region_of_match, NULL, &region->dev);
dev_set_drvdata(dev, region);
@@ -444,6 +439,8 @@ static int of_fpga_region_probe(struct platform_device *pdev)

return 0;

+eprobe_free:
+ fpga_region_free(region);
eprobe_mgr_put:
fpga_mgr_put(mgr);
return ret;
diff --git a/include/linux/fpga/fpga-region.h b/include/linux/fpga/fpga-region.h
index b652031..f2e215b 100644
--- a/include/linux/fpga/fpga-region.h
+++ b/include/linux/fpga/fpga-region.h
@@ -14,7 +14,6 @@
* @info: FPGA image info
* @priv: private data
* @get_bridges: optional function to get bridges to a list
- * @groups: optional attribute groups.
*/
struct fpga_region {
struct device dev;
@@ -24,7 +23,6 @@ struct fpga_region {
struct fpga_image_info *info;
void *priv;
int (*get_bridges)(struct fpga_region *region);
- const struct attribute_group **groups;
};

#define to_fpga_region(d) container_of(d, struct fpga_region, dev)
@@ -34,7 +32,12 @@ struct fpga_region *fpga_region_class_find(
int (*match)(struct device *, const void *));

int fpga_region_program_fpga(struct fpga_region *region);
-int fpga_region_register(struct device *dev, struct fpga_region *region);
-int fpga_region_unregister(struct fpga_region *region);
+
+struct fpga_region
+*fpga_region_create(struct device *dev, struct fpga_manager *mgr,
+ int (*get_bridges)(struct fpga_region *));
+void fpga_region_free(struct fpga_region *region);
+int fpga_region_register(struct fpga_region *region);
+void fpga_region_unregister(struct fpga_region *region);

#endif /* _FPGA_REGION_H */
--
2.7.4
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