Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1423094Ab2KNQAP (ORCPT ); Wed, 14 Nov 2012 11:00:15 -0500 Received: from mail-wg0-f44.google.com ([74.125.82.44]:38389 "EHLO mail-wg0-f44.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1423072Ab2KNQAD (ORCPT ); Wed, 14 Nov 2012 11:00:03 -0500 From: Benjamin Tissoires To: "benjamin.tissoires" , Dmitry Torokhov , Henrik Rydberg , Jiri Kosina , Stephane Chatty , linux-input@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v4 14/14] HID: hid-multitouch: forwards MSC_TIMESTAMP Date: Wed, 14 Nov 2012 16:59:26 +0100 Message-Id: <1352908766-4492-15-git-send-email-benjamin.tissoires@gmail.com> X-Mailer: git-send-email 1.8.0 In-Reply-To: <1352908766-4492-1-git-send-email-benjamin.tissoires@gmail.com> References: <1352908766-4492-1-git-send-email-benjamin.tissoires@gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4603 Lines: 137 Computes the device timestamp according to the specification. It also ensures that if the time between two events is greater than MAX_TIMESTAMP_INTERVAL, the timestamp will be reset. Signed-off-by: Benjamin Tissoires --- drivers/hid/hid-multitouch.c | 46 +++++++++++++++++++++++++++++++++++++++++--- include/linux/hid.h | 1 + 2 files changed, 44 insertions(+), 3 deletions(-) diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c index efae60c..47ccf3a 100644 --- a/drivers/hid/hid-multitouch.c +++ b/drivers/hid/hid-multitouch.c @@ -32,6 +32,7 @@ #include #include #include +#include #include "usbhid/usbhid.h" @@ -98,6 +99,9 @@ struct mt_device { bool serial_maybe; /* need to check for serial protocol */ bool curvalid; /* is the current contact valid? */ unsigned mt_flags; /* flags to pass to input-mt */ + __s32 dev_time; /* the scan time provided by the device */ + unsigned long jiffies; /* the frame's jiffies */ + unsigned timestamp; /* the timestamp to be sent */ }; /* classes of device behavior */ @@ -126,6 +130,8 @@ struct mt_device { #define MT_DEFAULT_MAXCONTACT 10 #define MT_MAX_MAXCONTACT 250 +#define MAX_TIMESTAMP_INTERVAL 500000 + #define MT_USB_DEVICE(v, p) HID_DEVICE(BUS_USB, HID_GROUP_MULTITOUCH, v, p) #define MT_BT_DEVICE(v, p) HID_DEVICE(BUS_BLUETOOTH, HID_GROUP_MULTITOUCH, v, p) @@ -459,12 +465,19 @@ static int mt_input_mapping(struct hid_device *hdev, struct hid_input *hi, mt_store_field(usage, td, hi); td->last_field_index = field->index; return 1; + case HID_DG_SCANTIME: + hid_map_usage(hi, usage, bit, max, + EV_MSC, MSC_TIMESTAMP); + set_bit(MSC_TIMESTAMP, hi->input->mscbit); + td->last_field_index = field->index; + return 1; case HID_DG_CONTACTCOUNT: td->last_field_index = field->index; return 1; case HID_DG_CONTACTMAX: - /* we don't set td->last_slot_field as contactcount and - * contact max are global to the report */ + /* we don't set td->last_slot_field as scan time, + * contactcount and contact max are global to the + * report */ td->last_field_index = field->index; return -1; } @@ -493,7 +506,8 @@ static int mt_input_mapped(struct hid_device *hdev, struct hid_input *hi, struct hid_field *field, struct hid_usage *usage, unsigned long **bit, int *max) { - if (usage->type == EV_KEY || usage->type == EV_ABS) + if (usage->type == EV_KEY || usage->type == EV_ABS || + usage->type == EV_MSC) set_bit(usage->type, hi->input->evbit); return -1; @@ -572,10 +586,33 @@ static void mt_complete_slot(struct mt_device *td, struct input_dev *input) static void mt_sync_frame(struct mt_device *td, struct input_dev *input) { input_mt_sync_frame(input); + input_event(input, EV_MSC, MSC_TIMESTAMP, td->timestamp); input_sync(input); td->num_received = 0; } +static void mt_compute_timestamp(struct mt_device *td, struct hid_field *field, + __s32 value) +{ + long delta = value - td->dev_time; + unsigned long jdelta = jiffies_to_usecs(jiffies - td->jiffies); + + td->jiffies = jiffies; + td->dev_time = value; + + if (delta < 0) + delta += field->logical_maximum; + + /* HID_DG_SCANTIME is expressed in 100us, we want it in ms. */ + delta *= 100; + + if (abs(delta - jdelta) > MAX_TIMESTAMP_INTERVAL) + /* obviously wrong clock -> the device time has been reset */ + td->timestamp = 0; + else + td->timestamp += delta; +} + static int mt_event(struct hid_device *hid, struct hid_field *field, struct hid_usage *usage, __s32 value) { @@ -623,6 +660,9 @@ static int mt_event(struct hid_device *hid, struct hid_field *field, case HID_DG_HEIGHT: td->curdata.h = value; break; + case HID_DG_SCANTIME: + mt_compute_timestamp(td, field, value); + break; case HID_DG_CONTACTCOUNT: /* * Includes multi-packet support where subsequent diff --git a/include/linux/hid.h b/include/linux/hid.h index ce14c32..aaba0e7 100644 --- a/include/linux/hid.h +++ b/include/linux/hid.h @@ -279,6 +279,7 @@ struct hid_item { #define HID_DG_DEVICEINDEX 0x000d0053 #define HID_DG_CONTACTCOUNT 0x000d0054 #define HID_DG_CONTACTMAX 0x000d0055 +#define HID_DG_SCANTIME 0x000d0056 /* * HID report types --- Ouch! HID spec says 1 2 3! -- 1.8.0 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/