From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755287AbcAHPXn (ORCPT ); Fri, 8 Jan 2016 10:23:43 -0500 Received: from mailout3.samsung.com ([203.254.224.33]:54816 "EHLO mailout3.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751167AbcAHPXl (ORCPT ); Fri, 8 Jan 2016 10:23:41 -0500 X-AuditID: cbfee61a-f79266d000003652-7f-568fd47ba71c From: Aniroop Mathur To: dmitry.torokhov@gmail.com Cc: linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, aniroop.mathur@gmail.com, Aniroop Mathur Subject: [PATCH] Input: evdev - add ioctl cmd EVIOCGBUFSIZE to get buffer size Date: Fri, 08 Jan 2016 20:53:08 +0530 Message-id: <1452266588-3139-1-git-send-email-a.mathur@samsung.com> X-Mailer: git-send-email 1.7.9.5 X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFnrJJMWRmVeSWpSXmKPExsVy+t9jQd3qK/1hBrPvilpc/HGOxeLn7hks FocXvWC0uPnpG6vF5V1z2BxYPXbOusvu0bdlFaPH501yAcxRXDYpqTmZZalF+nYJXBnnO3az FfTzVKz9e5+lgfEnZxcjJ4eEgInE8hlrWCFsMYkL99azdTFycQgJzGKU2LNvBZTzk1FiduMD IIeDg01AW+L9ZzaQBhEBWYmO47OYQWqYBRoYJdZMPM8CUiMs4Cfx94saSA2LgKrEhskN7CA2 r4CzxJPWv8wgJRICChJzJtlMYORewMiwilEitSC5oDgpPdcwL7Vcrzgxt7g0L10vOT93EyM4 AJ5J7WA8uMv9EKMAB6MSD2/Crr4wIdbEsuLK3EOMEhzMSiK8Gmf7w4R4UxIrq1KL8uOLSnNS iw8xSnOwKInz1l6KDBMSSE8sSc1OTS1ILYLJMnFwSjUwlk/nX6ay1qhioZBWzRLn5dm7uV2q 1+9llt+qe634jsREoVjpwAO+3u8PvOhkfPX675M9pwsXpy8vtYjTVlq34kSIePf0/PTl1TcZ uZ690kmc1vQr9nbiZZOrwgEyv25WbnuhqcMz9dGBuvfbdkwzWV2pI7WnoMvGWzOmg2PZlpNK F//NvGv5RImlOCPRUIu5qDgRAE5emh78AQAA Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add ioctl cmd EVIOCGBUFSIZE to get kernel buffer size of device so that clients can accordingly set the size of userspace buffer and can know maximum number of events that they are required to read in worst case. Signed-off-by: Aniroop Mathur --- drivers/input/evdev.c | 3 +++ include/uapi/linux/input.h | 2 ++ 2 files changed, 5 insertions(+) diff --git a/drivers/input/evdev.c b/drivers/input/evdev.c index e9ae3d5..8b16f08 100644 --- a/drivers/input/evdev.c +++ b/drivers/input/evdev.c @@ -1103,6 +1103,9 @@ static long evdev_do_ioctl(struct file *file, unsigned int cmd, return 0; + case EVIOCGBUFSIZE: + return put_user(client->bufsize, (unsigned int __user *)p); + case EVIOCRMFF: return input_ff_erase(dev, (int)(unsigned long) p, file); diff --git a/include/uapi/linux/input.h b/include/uapi/linux/input.h index 2758687..51d66aa 100644 --- a/include/uapi/linux/input.h +++ b/include/uapi/linux/input.h @@ -114,6 +114,8 @@ struct input_mask { #define EVIOCSKEYCODE _IOW('E', 0x04, unsigned int[2]) /* set keycode */ #define EVIOCSKEYCODE_V2 _IOW('E', 0x04, struct input_keymap_entry) +#define EVIOCGBUFSIZE _IOR('E', 0x05, unsigned int) /* get device buffer size */ + #define EVIOCGNAME(len) _IOC(_IOC_READ, 'E', 0x06, len) /* get device name */ #define EVIOCGPHYS(len) _IOC(_IOC_READ, 'E', 0x07, len) /* get physical location */ #define EVIOCGUNIQ(len) _IOC(_IOC_READ, 'E', 0x08, len) /* get unique identifier */ -- 1.7.9.5