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HID: wacom: EKR: use devres groups to manage resources

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This will be useful when each remote will be assigned its own input device.
We won't need to unregister each input and sysfs and other elements one
at a time.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Acked-by: Ping Cheng <pingc@wacom.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Benjamin Tissoires 2016-07-13 18:06:05 +02:00 committed by Jiri Kosina
parent 04bfa27b42
commit f9036bd436
1 changed files with 28 additions and 16 deletions
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44
drivers/hid/wacom_sys.c
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@ -934,8 +934,9 @@ static void wacom_devm_sysfs_group_release(struct device *dev, void *res)
sysfs_remove_group(kobj, devres->group);
}
static int wacom_devm_sysfs_create_group(struct wacom *wacom,
struct attribute_group *group)
static int __wacom_devm_sysfs_create_group(struct wacom *wacom,
struct kobject *root,
struct attribute_group *group)
{
struct wacom_sysfs_group_devres *devres;
int error;
@ -947,7 +948,7 @@ static int wacom_devm_sysfs_create_group(struct wacom *wacom,
return -ENOMEM;
devres->group = group;
devres->root = &wacom->hdev->dev.kobj;
devres->root = root;
error = sysfs_create_group(devres->root, group);
if (error)
@ -958,6 +959,13 @@ static int wacom_devm_sysfs_create_group(struct wacom *wacom,
return 0;
}
static int wacom_devm_sysfs_create_group(struct wacom *wacom,
struct attribute_group *group)
{
return __wacom_devm_sysfs_create_group(wacom, &wacom->hdev->dev.kobj,
group);
}
static void wacom_led_groups_release(void *data)
{
struct wacom *wacom = data;
@ -1306,9 +1314,10 @@ static int wacom_remote_create_attr_group(struct wacom *wacom, __u32 serial,
if (!remote->remote_group[index].name)
return -ENOMEM;
error = sysfs_create_group(remote->remote_dir,
&remote->remote_group[index]);
error = __wacom_devm_sysfs_create_group(wacom, remote->remote_dir,
&remote->remote_group[index]);
if (error) {
remote->remote_group[index].name = NULL;
hid_err(wacom->hdev,
"cannot create sysfs group err: %d\n", error);
return error;
@ -1317,15 +1326,6 @@ static int wacom_remote_create_attr_group(struct wacom *wacom, __u32 serial,
return 0;
}
static void wacom_remote_destroy_attr_group(struct wacom *wacom, unsigned int i)
{
struct wacom_remote *remote = wacom->remote;
sysfs_remove_group(remote->remote_dir, &remote->remote_group[i]);
devm_kfree(&wacom->hdev->dev, (char *)remote->remote_group[i].name);
remote->remote_group[i].name = NULL;
}
static int wacom_cmd_unpair_remote(struct wacom *wacom, unsigned char selector)
{
const size_t buf_size = 2;
@ -1906,11 +1906,13 @@ static void wacom_remote_destroy_one(struct wacom *wacom, unsigned int index)
u32 serial = remote->serial[index];
int i;
wacom_remote_destroy_attr_group(wacom, index);
if (remote->remote_group[index].name)
devres_release_group(&wacom->hdev->dev, &remote->serial[index]);
for (i = 0; i < WACOM_MAX_REMOTES; i++) {
if (remote->serial[i] == serial) {
remote->serial[i] = 0;
remote->remote_group[i].name = NULL;
wacom->led.groups[i].select = WACOM_STATUS_UNKNOWN;
}
}
@ -1920,6 +1922,7 @@ static int wacom_remote_create_one(struct wacom *wacom, u32 serial,
unsigned int index)
{
struct wacom_remote *remote = wacom->remote;
struct device *dev = &wacom->hdev->dev;
int error, k;
/* A remote can pair more than once with an EKR,
@ -1935,13 +1938,22 @@ static int wacom_remote_create_one(struct wacom *wacom, u32 serial,
return 0;
}
if (!devres_open_group(dev, &remote->serial[index], GFP_KERNEL))
return -ENOMEM;
error = wacom_remote_create_attr_group(wacom, serial, index);
if (error)
return error;
goto fail;
remote->serial[index] = serial;
devres_close_group(dev, &remote->serial[index]);
return 0;
fail:
devres_release_group(dev, &remote->serial[index]);
remote->serial[index] = 0;
return error;
}
static void wacom_remote_work(struct work_struct *work)