[PATCH v5 3/9] fpga: dfl: afu: convert platform_driver to use dev_groups

From: Wu Hao
Date: Sun Aug 11 2019 - 23:07:57 EST


This patch takes advantage of driver core which helps to create
and remove sysfs attribute files, so there is no need to register
sysfs entries manually in dfl-afu platform river code.

Signed-off-by: Wu Hao <hao.wu@xxxxxxxxx>
---
drivers/fpga/dfl-afu-main.c | 69 +++++++++++++++++++++++----------------------
1 file changed, 36 insertions(+), 33 deletions(-)

diff --git a/drivers/fpga/dfl-afu-main.c b/drivers/fpga/dfl-afu-main.c
index e50c45e..e955149 100644
--- a/drivers/fpga/dfl-afu-main.c
+++ b/drivers/fpga/dfl-afu-main.c
@@ -282,24 +282,17 @@ static int port_get_id(struct platform_device *pdev)
&dev_attr_power_state.attr,
NULL,
};
-ATTRIBUTE_GROUPS(port_hdr);
+
+static const struct attribute_group port_hdr_group = {
+ .attrs = port_hdr_attrs,
+};

static int port_hdr_init(struct platform_device *pdev,
struct dfl_feature *feature)
{
- dev_dbg(&pdev->dev, "PORT HDR Init.\n");
-
port_reset(pdev);

- return device_add_groups(&pdev->dev, port_hdr_groups);
-}
-
-static void port_hdr_uinit(struct platform_device *pdev,
- struct dfl_feature *feature)
-{
- dev_dbg(&pdev->dev, "PORT HDR UInit.\n");
-
- device_remove_groups(&pdev->dev, port_hdr_groups);
+ return 0;
}

static long
@@ -330,7 +323,6 @@ static void port_hdr_uinit(struct platform_device *pdev,

static const struct dfl_feature_ops port_hdr_ops = {
.init = port_hdr_init,
- .uinit = port_hdr_uinit,
.ioctl = port_hdr_ioctl,
};

@@ -361,32 +353,37 @@ static void port_hdr_uinit(struct platform_device *pdev,
&dev_attr_afu_id.attr,
NULL
};
-ATTRIBUTE_GROUPS(port_afu);

-static int port_afu_init(struct platform_device *pdev,
- struct dfl_feature *feature)
+static umode_t port_afu_attrs_visible(struct kobject *kobj,
+ struct attribute *attr, int n)
{
- struct resource *res = &pdev->resource[feature->resource_index];
- int ret;
-
- dev_dbg(&pdev->dev, "PORT AFU Init.\n");
+ struct device *dev = kobj_to_dev(kobj);

- ret = afu_mmio_region_add(dev_get_platdata(&pdev->dev),
- DFL_PORT_REGION_INDEX_AFU, resource_size(res),
- res->start, DFL_PORT_REGION_READ |
- DFL_PORT_REGION_WRITE | DFL_PORT_REGION_MMAP);
- if (ret)
- return ret;
+ /*
+ * sysfs entries are visible only if related private feature is
+ * enumerated.
+ */
+ if (!dfl_get_feature_by_id(dev, PORT_FEATURE_ID_AFU))
+ return 0;

- return device_add_groups(&pdev->dev, port_afu_groups);
+ return attr->mode;
}

-static void port_afu_uinit(struct platform_device *pdev,
- struct dfl_feature *feature)
+static const struct attribute_group port_afu_group = {
+ .attrs = port_afu_attrs,
+ .is_visible = port_afu_attrs_visible,
+};
+
+static int port_afu_init(struct platform_device *pdev,
+ struct dfl_feature *feature)
{
- dev_dbg(&pdev->dev, "PORT AFU UInit.\n");
+ struct resource *res = &pdev->resource[feature->resource_index];

- device_remove_groups(&pdev->dev, port_afu_groups);
+ return afu_mmio_region_add(dev_get_platdata(&pdev->dev),
+ DFL_PORT_REGION_INDEX_AFU,
+ resource_size(res), res->start,
+ DFL_PORT_REGION_MMAP | DFL_PORT_REGION_READ |
+ DFL_PORT_REGION_WRITE);
}

static const struct dfl_feature_id port_afu_id_table[] = {
@@ -396,7 +393,6 @@ static void port_afu_uinit(struct platform_device *pdev,

static const struct dfl_feature_ops port_afu_ops = {
.init = port_afu_init,
- .uinit = port_afu_uinit,
};

static struct dfl_feature_driver port_feature_drvs[] = {
@@ -748,9 +744,16 @@ static int afu_remove(struct platform_device *pdev)
return 0;
}

+static const struct attribute_group *afu_dev_groups[] = {
+ &port_hdr_group,
+ &port_afu_group,
+ NULL
+};
+
static struct platform_driver afu_driver = {
.driver = {
- .name = DFL_FPGA_FEATURE_DEV_PORT,
+ .name = DFL_FPGA_FEATURE_DEV_PORT,
+ .dev_groups = afu_dev_groups,
},
.probe = afu_probe,
.remove = afu_remove,
--
1.8.3.1