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path: root/drivers/hid/hid-wiimote.c
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Diffstat (limited to 'drivers/hid/hid-wiimote.c')
-rw-r--r--drivers/hid/hid-wiimote.c78
1 files changed, 78 insertions, 0 deletions
diff --git a/drivers/hid/hid-wiimote.c b/drivers/hid/hid-wiimote.c
index 811ed8921013..bfc50493ec6b 100644
--- a/drivers/hid/hid-wiimote.c
+++ b/drivers/hid/hid-wiimote.c
@@ -15,15 +15,28 @@
#include <linux/hid.h>
#include <linux/input.h>
#include <linux/module.h>
+#include <linux/spinlock.h>
#include "hid-ids.h"
#define WIIMOTE_VERSION "0.1"
#define WIIMOTE_NAME "Nintendo Wii Remote"
+#define WIIMOTE_BUFSIZE 32
+
+struct wiimote_buf {
+ __u8 data[HID_MAX_BUFFER_SIZE];
+ size_t size;
+};
struct wiimote_data {
atomic_t ready;
struct hid_device *hdev;
struct input_dev *input;
+
+ spinlock_t qlock;
+ __u8 head;
+ __u8 tail;
+ struct wiimote_buf outq[WIIMOTE_BUFSIZE];
+ struct work_struct worker;
};
static ssize_t wiimote_hid_send(struct hid_device *hdev, __u8 *buffer,
@@ -45,6 +58,65 @@ static ssize_t wiimote_hid_send(struct hid_device *hdev, __u8 *buffer,
return ret;
}
+static void wiimote_worker(struct work_struct *work)
+{
+ struct wiimote_data *wdata = container_of(work, struct wiimote_data,
+ worker);
+ unsigned long flags;
+
+ spin_lock_irqsave(&wdata->qlock, flags);
+
+ while (wdata->head != wdata->tail) {
+ spin_unlock_irqrestore(&wdata->qlock, flags);
+ wiimote_hid_send(wdata->hdev, wdata->outq[wdata->tail].data,
+ wdata->outq[wdata->tail].size);
+ spin_lock_irqsave(&wdata->qlock, flags);
+
+ wdata->tail = (wdata->tail + 1) % WIIMOTE_BUFSIZE;
+ }
+
+ spin_unlock_irqrestore(&wdata->qlock, flags);
+}
+
+static void wiimote_queue(struct wiimote_data *wdata, const __u8 *buffer,
+ size_t count)
+{
+ unsigned long flags;
+ __u8 newhead;
+
+ if (count > HID_MAX_BUFFER_SIZE) {
+ hid_warn(wdata->hdev, "Sending too large output report\n");
+ return;
+ }
+
+ /*
+ * Copy new request into our output queue and check whether the
+ * queue is full. If it is full, discard this request.
+ * If it is empty we need to start a new worker that will
+ * send out the buffer to the hid device.
+ * If the queue is not empty, then there must be a worker
+ * that is currently sending out our buffer and this worker
+ * will reschedule itself until the queue is empty.
+ */
+
+ spin_lock_irqsave(&wdata->qlock, flags);
+
+ memcpy(wdata->outq[wdata->head].data, buffer, count);
+ wdata->outq[wdata->head].size = count;
+ newhead = (wdata->head + 1) % WIIMOTE_BUFSIZE;
+
+ if (wdata->head == wdata->tail) {
+ wdata->head = newhead;
+ schedule_work(&wdata->worker);
+ } else if (newhead != wdata->tail) {
+ wdata->head = newhead;
+ } else {
+ hid_warn(wdata->hdev, "Output queue is full");
+ }
+
+ spin_unlock_irqrestore(&wdata->qlock, flags);
+}
+
static int wiimote_input_event(struct input_dev *dev, unsigned int type,
unsigned int code, int value)
{
@@ -100,6 +172,9 @@ static struct wiimote_data *wiimote_create(struct hid_device *hdev)
wdata->input->id.version = wdata->hdev->version;
wdata->input->name = WIIMOTE_NAME;
+ spin_lock_init(&wdata->qlock);
+ INIT_WORK(&wdata->worker, wiimote_worker);
+
return wdata;
}
@@ -157,8 +232,11 @@ static void wiimote_hid_remove(struct hid_device *hdev)
struct wiimote_data *wdata = hid_get_drvdata(hdev);
hid_info(hdev, "Device removed\n");
+
hid_hw_stop(hdev);
input_unregister_device(wdata->input);
+
+ cancel_work_sync(&wdata->worker);
wiimote_destroy(wdata);
}