From patchwork Wed Dec 17 23:07:54 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Aniroop Mathur X-Patchwork-Id: 5509571 Return-Path: X-Original-To: patchwork-linux-input@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id D4845BEEA8 for ; Wed, 17 Dec 2014 23:08:10 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id E9CC6209E5 for ; Wed, 17 Dec 2014 23:08:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id ECC5A209D5 for ; Wed, 17 Dec 2014 23:08:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750968AbaLQXIH (ORCPT ); Wed, 17 Dec 2014 18:08:07 -0500 Received: from mail-pd0-f180.google.com ([209.85.192.180]:61089 "EHLO mail-pd0-f180.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750949AbaLQXIH (ORCPT ); Wed, 17 Dec 2014 18:08:07 -0500 Received: by mail-pd0-f180.google.com with SMTP id w10so64396pde.25 for ; Wed, 17 Dec 2014 15:08:06 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=from:to:cc:subject:date:message-id; bh=GrXQ1+PlhfQmfkcq1K413PMYra14rDGuuYVRChtn4XE=; b=ruk0ssILHfbb/PHlmaVGHfwIL4Pni2JE6xym8FDgtRmV3x9vM+dsWQ2SVPjTtm6EQd UNJiTSn2gnvk9zpZ3yalY71MJbK72GWCa5+5A0/T6UdHeeKZ4138bp65ummmnDJoxQ6q IPAy1wrmAUP8ZSHmVV2K07xq6C+ex9hQacMPLZCZUh03QLUOixpxFpM0NAoOqoD7a2Gc H7D7JqF11O5pZ3sWq1GiV3BwQzaSs3wGdyIPRB6DVokvdLWEbP9OA8bwHJ/ILOhGXFWX HgETyZJigHcbynOcXlL0XV2o7/eqFFK0id9LccfOwFqHvjqf0FSm1UT0LgtDoNnaase1 P4Rg== X-Received: by 10.66.169.209 with SMTP id ag17mr73159445pac.62.1418857685963; Wed, 17 Dec 2014 15:08:05 -0800 (PST) Received: from localhost.localdomain ([115.118.59.226]) by mx.google.com with ESMTPSA id qz7sm4947813pbb.12.2014.12.17.15.08.02 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Wed, 17 Dec 2014 15:08:04 -0800 (PST) From: Aniroop Mathur To: , , Cc: , Subject: [PATCH] Input: Add CLOCK_BOOTTIME Support Date: Thu, 18 Dec 2014 04:37:54 +0530 Message-Id: <1418857674-6249-1-git-send-email-aniroop.mathur@gmail.com> X-Mailer: git-send-email 1.9.1 Sender: linux-input-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org X-Spam-Status: No, score=-6.8 required=5.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED, DKIM_SIGNED, FREEMAIL_FROM, RCVD_IN_DNSWL_HI, T_DKIM_INVALID, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=ham version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This patch adds support for CLOCK_BOOTTIME for input event timestamp. CLOCK_BOOTTIME includes suspend time, so it would allow aplications to get correct time difference between two events even when system resumes from suspend state. Signed-off-by: Aniroop Mathur --- drivers/input/evdev.c | 52 +++++++++++++++++++++++++++++++++++++-------------- 1 file changed, 38 insertions(+), 14 deletions(-) diff --git a/drivers/input/evdev.c b/drivers/input/evdev.c index de05545..bfca214 100644 --- a/drivers/input/evdev.c +++ b/drivers/input/evdev.c @@ -28,6 +28,13 @@ #include #include "input-compat.h" +enum evdev_clock_type { + EV_CLK_REAL = 0, + EV_CLK_MONO, + EV_CLK_BOOT, + EV_CLK_MAX +}; + struct evdev { int open; struct input_handle handle; @@ -49,12 +56,29 @@ struct evdev_client { struct fasync_struct *fasync; struct evdev *evdev; struct list_head node; - int clkid; + int clk_type; bool revoked; unsigned int bufsize; struct input_event buffer[]; }; +static int evdev_set_clk_type(int id, struct evdev_client *client) +{ + switch (id) { + + case CLOCK_REALTIME: + client->clk_type = EV_CLK_REAL; break; + case CLOCK_MONOTONIC: + client->clk_type = EV_CLK_MONO; break; + case CLOCK_BOOTTIME: + client->clk_type = EV_CLK_BOOT; break; + default: + return -EINVAL; + } + + return 0; +} + /* flush queued events of type @type, caller must hold client->buffer_lock */ static void __evdev_flush_queue(struct evdev_client *client, unsigned int type) { @@ -108,8 +132,9 @@ static void evdev_queue_syn_dropped(struct evdev_client *client) struct input_event ev; ktime_t time; - time = (client->clkid == CLOCK_MONOTONIC) ? - ktime_get() : ktime_get_real(); + time = (client->clk_type == EV_CLK_REAL) ? + ktime_get_real() : (client->clk_type == EV_CLK_MONO) ? + ktime_get() : ktime_get_boottime(); ev.time = ktime_to_timeval(time); ev.type = EV_SYN; @@ -159,7 +184,7 @@ static void __pass_event(struct evdev_client *client, static void evdev_pass_values(struct evdev_client *client, const struct input_value *vals, unsigned int count, - ktime_t mono, ktime_t real) + ktime_t *ev_time) { struct evdev *evdev = client->evdev; const struct input_value *v; @@ -169,8 +194,7 @@ static void evdev_pass_values(struct evdev_client *client, if (client->revoked) return; - event.time = ktime_to_timeval(client->clkid == CLOCK_MONOTONIC ? - mono : real); + event.time = ktime_to_timeval(ev_time[client->clk_type]); /* Interrupts are disabled, just acquire the lock. */ spin_lock(&client->buffer_lock); @@ -198,21 +222,22 @@ static void evdev_events(struct input_handle *handle, { struct evdev *evdev = handle->private; struct evdev_client *client; - ktime_t time_mono, time_real; + ktime_t ev_time[EV_CLK_MAX]; - time_mono = ktime_get(); - time_real = ktime_mono_to_real(time_mono); + ev_time[EV_CLK_MONO] = ktime_get(); + ev_time[EV_CLK_REAL] = ktime_mono_to_real(ev_time[EV_CLK_MONO]); + ev_time[EV_CLK_BOOT] = ktime_mono_to_any(ev_time[EV_CLK_BOOT], + TK_OFFS_BOOT); rcu_read_lock(); client = rcu_dereference(evdev->grab); if (client) - evdev_pass_values(client, vals, count, time_mono, time_real); + evdev_pass_values(client, vals, count, ev_time); else list_for_each_entry_rcu(client, &evdev->client_list, node) - evdev_pass_values(client, vals, count, - time_mono, time_real); + evdev_pass_values(client, vals, count, ev_time); rcu_read_unlock(); } @@ -874,9 +899,8 @@ static long evdev_do_ioctl(struct file *file, unsigned int cmd, case EVIOCSCLOCKID: if (copy_from_user(&i, p, sizeof(unsigned int))) return -EFAULT; - if (i != CLOCK_MONOTONIC && i != CLOCK_REALTIME) + if (evdev_set_clk_type(i, client)) return -EINVAL; - client->clkid = i; return 0; case EVIOCGKEYCODE: