From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Woodhouse Subject: [RFC/RFT] Reset bcm5974 into wellspring mode when it forgets Date: Thu, 14 Mar 2013 14:30:07 +0000 Message-ID: <1363271407.4853.52.camel@i7.infradead.org> Mime-Version: 1.0 Content-Type: multipart/signed; micalg="sha1"; protocol="application/x-pkcs7-signature"; boundary="=-eZ84RDj8vrIDq8khEVO1" Return-path: Received: from merlin.infradead.org ([205.233.59.134]:59109 "EHLO merlin.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755923Ab3CNOaR (ORCPT ); Thu, 14 Mar 2013 10:30:17 -0400 Sender: linux-input-owner@vger.kernel.org List-Id: linux-input@vger.kernel.org To: Henrik Rydberg Cc: linux-input@vger.kernel.org --=-eZ84RDj8vrIDq8khEVO1 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable 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 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 =3D=3D 2) goto exit; =20 - 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 =3D=3D 8) { + /* Hm. Make sure it's in wellspring mode... */ + schedule_work(&dev->reset_work); + } + } =20 exit: error =3D usb_submit_urb(dev->tp_urb, GFP_ATOMIC); @@ -815,6 +821,14 @@ static int bcm5974_resume(struct usb_interface *iface) return error; } =20 +static void bcm5974_mode_workfn(struct work_struct *work) +{ + struct bcm5974 *dev =3D 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 =3D input_dev; dev->cfg =3D *cfg; mutex_init(&dev->pm_mutex); + INIT_WORK(&dev->reset_work, bcm5974_mode_workfn); =20 /* setup urbs */ if (cfg->tp_type =3D=3D TYPE1) { @@ -936,6 +951,7 @@ static void bcm5974_disconnect(struct usb_interface *if= ace) 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); } =20 --=20 David Woodhouse Open Source Technology Centre David.Woodhouse@intel.com Intel Corporation --=-eZ84RDj8vrIDq8khEVO1 Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIUbjCCBjQw ggQcoAMCAQICAR4wDQYJKoZIhvcNAQEFBQAwfTELMAkGA1UEBhMCSUwxFjAUBgNVBAoTDVN0YXJ0 Q29tIEx0ZC4xKzApBgNVBAsTIlNlY3VyZSBEaWdpdGFsIENlcnRpZmljYXRlIFNpZ25pbmcxKTAn BgNVBAMTIFN0YXJ0Q29tIENlcnRpZmljYXRpb24gQXV0aG9yaXR5MB4XDTA3MTAyNDIxMDE1NVoX DTE3MTAyNDIxMDE1NVowgYwxCzAJBgNVBAYTAklMMRYwFAYDVQQKEw1TdGFydENvbSBMdGQuMSsw KQYDVQQLEyJTZWN1cmUgRGlnaXRhbCBDZXJ0aWZpY2F0ZSBTaWduaW5nMTgwNgYDVQQDEy9TdGFy dENvbSBDbGFzcyAxIFByaW1hcnkgSW50ZXJtZWRpYXRlIENsaWVudCBDQTCCASIwDQYJKoZIhvcN AQEBBQADggEPADCCAQoCggEBAMcJg8zOLdgasSmkLhOrlr6KMoOMpohBllVHrdRvEg/q6r8jR+EK 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