From patchwork Fri Jul 19 08:39:37 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Srinivas KANDAGATLA X-Patchwork-Id: 2830404 Return-Path: X-Original-To: patchwork-linux-media@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 BA9ECC0319 for ; Fri, 19 Jul 2013 08:49:25 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 86C5920158 for ; Fri, 19 Jul 2013 08:49:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 83F5120145 for ; Fri, 19 Jul 2013 08:49:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760053Ab3GSIs7 (ORCPT ); Fri, 19 Jul 2013 04:48:59 -0400 Received: from eu1sys200aog104.obsmtp.com ([207.126.144.117]:35335 "EHLO eu1sys200aog104.obsmtp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1760046Ab3GSIss (ORCPT ); Fri, 19 Jul 2013 04:48:48 -0400 Received: from beta.dmz-eu.st.com ([164.129.1.35]) (using TLSv1) by eu1sys200aob104.postini.com ([207.126.147.11]) with SMTP ID DSNKUej9aqzGqSjmcciGty16C8u5KAVxCTlb@postini.com; Fri, 19 Jul 2013 08:48:47 UTC Received: from zeta.dmz-eu.st.com (zeta.dmz-eu.st.com [164.129.230.9]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id A39D9199; Fri, 19 Jul 2013 08:48:37 +0000 (GMT) Received: from mail7.sgp.st.com (unknown [164.129.223.81]) by zeta.dmz-eu.st.com (STMicroelectronics) with ESMTP id B5A7A4655; Fri, 19 Jul 2013 08:48:09 +0000 (GMT) Received: from localhost (king.bri.st.com [10.65.51.59]) by mail7.sgp.st.com (MOS 4.3.3-GA) with ESMTP id BIB19102 (AUTH srinivak); Fri, 19 Jul 2013 10:48:39 +0200 From: Srinivas KANDAGATLA To: linux-media@vger.kernel.org Cc: alipowski@interia.pl, Mauro Carvalho Chehab , linux-kernel@vger.kernel.org, srinivas.kandagatla@gmail.com, srinivas.kandagatla@st.com, sean@mess.org Subject: [PATCH v1 2/2] media: lirc: Allow lirc dev to talk to rc device Date: Fri, 19 Jul 2013 09:39:37 +0100 Message-Id: <1374223177-5035-1-git-send-email-srinivas.kandagatla@st.com> X-Mailer: git-send-email 1.7.6.5 In-Reply-To: <1374223132-4924-1-git-send-email-srinivas.kandagatla@st.com> References: <1374223132-4924-1-git-send-email-srinivas.kandagatla@st.com> Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org X-Spam-Status: No, score=-7.3 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable 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 From: Srinivas Kandagatla The use case is simple, if any rc device has allowed protocols = RC_TYPE_LIRC and map_name = RC_MAP_LIRC set, the driver open will be never called. The reason for this is, all of the key maps except lirc have some KEYS in there map, so during rc_register_device process these keys are matched against the input drivers and open is performed, so for the case of RC_MAP_EMPTY, a vt/keyboard is matched and the driver open is performed. In case of lirc, there is no match and result is that there is no open performed, however the lirc-dev will go ahead and create a /dev/lirc0 node. Now when lircd/mode2 opens this device, no data is available because the driver was never opened. Other case pointed by Sean Young, As rc device gets opened via the input interface. If the input device is never opened (e.g. embedded with no console) then the rc open is never called and lirc will not work either. So that's another case. lirc_dev seems to have no link with actual rc device w.r.t open/close. This patch adds rc_dev pointer to lirc_driver structure for cases like this, so that it can do the open/close of the real driver in accordance to lircd/mode2 open/close. Without this patch its impossible to open a rc device which has RC_TYPE_LIRC ad RC_MAP_LIRC set. Signed-off-by: Srinivas Kandagatla --- drivers/media/rc/ir-lirc-codec.c | 1 + drivers/media/rc/lirc_dev.c | 16 ++++++++++++++++ include/media/lirc_dev.h | 1 + 3 files changed, 18 insertions(+), 0 deletions(-) diff --git a/drivers/media/rc/ir-lirc-codec.c b/drivers/media/rc/ir-lirc-codec.c index e456126..d5ad27f 100644 --- a/drivers/media/rc/ir-lirc-codec.c +++ b/drivers/media/rc/ir-lirc-codec.c @@ -375,6 +375,7 @@ static int ir_lirc_register(struct rc_dev *dev) drv->code_length = sizeof(struct ir_raw_event) * 8; drv->fops = &lirc_fops; drv->dev = &dev->dev; + drv->rc_dev = dev; drv->owner = THIS_MODULE; drv->minor = lirc_register_driver(drv); diff --git a/drivers/media/rc/lirc_dev.c b/drivers/media/rc/lirc_dev.c index 8dc057b..5f69fc0 100644 --- a/drivers/media/rc/lirc_dev.c +++ b/drivers/media/rc/lirc_dev.c @@ -35,6 +35,7 @@ #include #include +#include #include #include @@ -437,6 +438,7 @@ EXPORT_SYMBOL(lirc_unregister_driver); int lirc_dev_fop_open(struct inode *inode, struct file *file) { struct irctl *ir; + struct rc_dev *rc_dev; struct cdev *cdev; int retval = 0; @@ -467,6 +469,15 @@ int lirc_dev_fop_open(struct inode *inode, struct file *file) goto error; } + rc_dev = ir->d.rc_dev; + if (rc_dev && !rc_dev->users++ && rc_dev->open) { + retval = rc_dev->open(rc_dev); + if (retval) { + rc_dev->users--; + goto error; + } + } + cdev = ir->cdev; if (try_module_get(cdev->owner)) { ir->open++; @@ -499,6 +510,7 @@ int lirc_dev_fop_close(struct inode *inode, struct file *file) { struct irctl *ir = irctls[iminor(inode)]; struct cdev *cdev; + struct rc_dev *rc_dev; if (!ir) { printk(KERN_ERR "%s: called with invalid irctl\n", __func__); @@ -511,6 +523,10 @@ int lirc_dev_fop_close(struct inode *inode, struct file *file) WARN_ON(mutex_lock_killable(&lirc_dev_lock)); + rc_dev = ir->d.rc_dev; + if (rc_dev && !--rc_dev->users && rc_dev->close) + rc_dev->close(rc_dev); + ir->open--; if (ir->attached) { ir->d.set_use_dec(ir->d.data); diff --git a/include/media/lirc_dev.h b/include/media/lirc_dev.h index 168dd0b..96dccb6 100644 --- a/include/media/lirc_dev.h +++ b/include/media/lirc_dev.h @@ -139,6 +139,7 @@ struct lirc_driver { struct lirc_buffer *rbuf; int (*set_use_inc) (void *data); void (*set_use_dec) (void *data); + struct rc_dev *rc_dev; const struct file_operations *fops; struct device *dev; struct module *owner;