HID: wacom: EKR: add a worker to add/remove resources on addition/removal
wacom_remote_status_irq() sends information of addition/removal of EKR.
We want to allocate one input node per remote, so better having this
in a separate worker, not handled in the IRQ directly.
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Acked-by: Ping Cheng <pingc@wacom.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/drivers/hid/wacom_sys.c b/drivers/hid/wacom_sys.c
index 4d4c737..7e01117 100644
--- a/drivers/hid/wacom_sys.c
+++ b/drivers/hid/wacom_sys.c
@@ -1294,7 +1294,8 @@
DEVICE_EKR_ATTR_GROUP(3);
DEVICE_EKR_ATTR_GROUP(4);
-int wacom_remote_create_attr_group(struct wacom *wacom, __u32 serial, int index)
+static int wacom_remote_create_attr_group(struct wacom *wacom, __u32 serial,
+ int index)
{
int error = 0;
struct wacom_wac *wacom_wac = &wacom->wacom_wac;
@@ -1318,7 +1319,7 @@
return 0;
}
-void wacom_remote_destroy_attr_group(struct wacom *wacom, __u32 serial)
+static void wacom_remote_destroy_attr_group(struct wacom *wacom, __u32 serial)
{
struct wacom_wac *wacom_wac = &wacom->wacom_wac;
int i;
@@ -1889,6 +1890,65 @@
return;
}
+static void wacom_remote_work(struct work_struct *work)
+{
+ struct wacom *wacom = container_of(work, struct wacom, remote_work);
+ struct wacom_wac *wacom_wac = &wacom->wacom_wac;
+ struct wacom_remote_data data;
+ unsigned long flags;
+ unsigned int count;
+ u32 serial;
+ int i, k;
+
+ spin_lock_irqsave(&wacom->remote_lock, flags);
+
+ count = kfifo_out(&wacom->remote_fifo, &data, sizeof(data));
+
+ if (count != sizeof(data)) {
+ hid_err(wacom->hdev,
+ "workitem triggered without status available\n");
+ spin_unlock_irqrestore(&wacom->remote_lock, flags);
+ return;
+ }
+
+ if (!kfifo_is_empty(&wacom->remote_fifo))
+ wacom_schedule_work(&wacom->wacom_wac, WACOM_WORKER_REMOTE);
+
+ spin_unlock_irqrestore(&wacom->remote_lock, flags);
+
+ for (i = 0; i < WACOM_MAX_REMOTES; i++) {
+ serial = data.remote[i].serial;
+ if (data.remote[i].connected) {
+
+ if (wacom_wac->serial[i] == serial)
+ continue;
+
+ if (wacom_wac->serial[i]) {
+ wacom_remote_destroy_attr_group(wacom,
+ wacom_wac->serial[i]);
+ }
+
+ /* A remote can pair more than once with an EKR,
+ * check to make sure this serial isn't already paired.
+ */
+ for (k = 0; k < WACOM_MAX_REMOTES; k++) {
+ if (wacom_wac->serial[k] == serial)
+ break;
+ }
+
+ if (k < WACOM_MAX_REMOTES) {
+ wacom_wac->serial[i] = serial;
+ continue;
+ }
+ wacom_remote_create_attr_group(wacom, serial, i);
+
+ } else if (wacom_wac->serial[i]) {
+ wacom_remote_destroy_attr_group(wacom,
+ wacom_wac->serial[i]);
+ }
+ }
+}
+
static int wacom_probe(struct hid_device *hdev,
const struct hid_device_id *id)
{
@@ -1931,6 +1991,17 @@
mutex_init(&wacom->lock);
INIT_WORK(&wacom->wireless_work, wacom_wireless_work);
INIT_WORK(&wacom->battery_work, wacom_battery_work);
+ INIT_WORK(&wacom->remote_work, wacom_remote_work);
+ spin_lock_init(&wacom->remote_lock);
+
+ if (kfifo_alloc(&wacom->remote_fifo,
+ 5 * sizeof(struct wacom_remote_data),
+ GFP_KERNEL)) {
+ dev_err(&hdev->dev,
+ "%s:failed allocating remote_fifo\n", __func__);
+ error = -ENOMEM;
+ goto fail_type;
+ }
/* ask for the report descriptor to be loaded by HID */
error = hid_parse(hdev);
@@ -1953,8 +2024,9 @@
return 0;
-fail_type:
fail_parse:
+ kfifo_free(&wacom->remote_fifo);
+fail_type:
hid_set_drvdata(hdev, NULL);
return error;
}
@@ -1972,6 +2044,8 @@
cancel_work_sync(&wacom->wireless_work);
cancel_work_sync(&wacom->battery_work);
+ cancel_work_sync(&wacom->remote_work);
+ kfifo_free(&wacom->remote_fifo);
kobject_put(wacom->remote_dir);
if (hdev->bus == BUS_BLUETOOTH)
device_remove_file(&hdev->dev, &dev_attr_speed);