Occasionally the trackpad in my MacBookPro 8,3 stops working, spewing 'bcm5974: bad trackpad package, length: 8'
I haven't been able to reproduce this on demand, but it's annoying when
it does happen. I'm *assuming* that it's somehow forgotten what mode
it's supposed to be in. The fix for this on suspend/resume was to switch
it back to Wellspring mode again, so let's try that...
Untested, because my trackpad seems to *know* when I'm actually running
a kernel with this patch, and doesn't ever misbehave. I've played with
removing the *normal* mode switch in bcm5974_start_traffic() but can't
get it to produce the 'bad trackpad package' message at all in that
case, so the rest function doesn't get invoked.
Signed-off-by: David Woodhouse <david.woodho...@intel.com>
diff --git a/drivers/input/mouse/bcm5974.c b/drivers/input/mouse/bcm5974.c
index 2baff1b..db0b3ab 100644
--- a/drivers/input/mouse/bcm5974.c
+++ b/drivers/input/mouse/bcm5974.c
@@ -244,6 +244,7 @@ struct bcm5974 {
struct bt_data *bt_data; /* button transferred data */
struct urb *tp_urb; /* trackpad usb request block */
u8 *tp_data; /* trackpad transferred data */
+ struct work_struct reset_work; /* reset to wellspring mode */
const struct tp_finger *index[MAX_FINGERS]; /* finger index data */
struct input_mt_pos pos[MAX_FINGERS]; /* position array */
int slots[MAX_FINGERS]; /* slot assignments */
@@ -676,9 +677,14 @@ static void bcm5974_irq_trackpad(struct urb *urb)
if (dev->tp_urb->actual_length == 2)
goto exit;
- if (report_tp_state(dev, dev->tp_urb->actual_length))
+ if (report_tp_state(dev, dev->tp_urb->actual_length)) {
dprintk(1, "bcm5974: bad trackpad package, length: %d\n",
dev->tp_urb->actual_length);
+ if (dev->tp_urb->actual_length == 8) {
+ /* Hm. Make sure it's in wellspring mode... */
+ schedule_work(&dev->reset_work);
+ }
+ }
exit:
error = usb_submit_urb(dev->tp_urb, GFP_ATOMIC);
@@ -815,6 +821,14 @@ static int bcm5974_resume(struct usb_interface *iface)
return error;
}
+static void bcm5974_mode_workfn(struct work_struct *work)
+{
+ struct bcm5974 *dev = container_of(work, struct bcm5974, reset_work);
+
+ dev_info(&dev->intf->dev, "Reset into wellspring mode...\n");
+ bcm5974_wellspring_mode(dev, true);
+}
+
static int bcm5974_probe(struct usb_interface *iface,
const struct usb_device_id *id)
{
@@ -840,6 +854,7 @@ static int bcm5974_probe(struct usb_interface *iface,
dev->input = input_dev;
dev->cfg = *cfg;
mutex_init(&dev->pm_mutex);
+ INIT_WORK(&dev->reset_work, bcm5974_mode_workfn);
/* setup urbs */
if (cfg->tp_type == TYPE1) {
@@ -936,6 +951,7 @@ static void bcm5974_disconnect(struct usb_interface *iface)
dev->bt_data, dev->bt_urb->transfer_dma);
usb_free_urb(dev->tp_urb);
usb_free_urb(dev->bt_urb);
+ cancel_work_sync(&dev->reset_work);
kfree(dev);
}
--
David Woodhouse Open Source Technology Centre
david.woodho...@intel.com Intel Corporation
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