From patchwork Wed Jun 12 18:38:09 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mauro Carvalho Chehab X-Patchwork-Id: 10990713 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 019051395 for ; Wed, 12 Jun 2019 18:41:00 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E7A79285C4 for ; Wed, 12 Jun 2019 18:40:59 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id D918828A72; Wed, 12 Jun 2019 18:40:59 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.7 required=2.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 2C321285C4 for ; Wed, 12 Jun 2019 18:40:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727450AbfFLSik (ORCPT ); Wed, 12 Jun 2019 14:38:40 -0400 Received: from bombadil.infradead.org ([198.137.202.133]:45624 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727338AbfFLSik (ORCPT ); Wed, 12 Jun 2019 14:38:40 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=Sender:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help: List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=GntXfWvv3Kib071YwaPKih5y5ex+thT7vmhRle4jSaM=; b=VsckxsCeTCYxrgH5BB2U+k2cqP MHCdqskcbnDWDqThpf+byRItGY+Ch1bRqwqC37Y+LsPg6/Gtqs7Jg5WX58PMeepNoaGsoCT3E2WA4 uECxCxzQd/Vbl3k52pXpxMGQlNzuNuV+4DB+/FV4E3/MOHnR8kzAOifsaSH5Q4M1M+LEO4PTLqFFv 6bWiOdCySaSIUdFHl3Ji6YvT5fjWmlTzWPX+b2Hw7ui6IOll6jysABbKW00h0Sy0ZbOEs8HFvYRbc eymUkJQ6lpRf3j+OrJZShku7jmclE82NhFhUNN6oSp4/04S5Rtv5qwxe9EaJ5UJtXcRXPDtPTqWhe U+No6K1Q==; Received: from 201.86.169.251.dynamic.adsl.gvt.net.br ([201.86.169.251] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtpsa (Exim 4.92 #3 (Red Hat Linux)) id 1hb88s-0006YV-ND; Wed, 12 Jun 2019 18:38:38 +0000 Received: from mchehab by bombadil.infradead.org with local (Exim 4.92) (envelope-from ) id 1hb88p-0002Ad-UG; Wed, 12 Jun 2019 15:38:35 -0300 From: Mauro Carvalho Chehab To: Linux Doc Mailing List Cc: Mauro Carvalho Chehab , Mauro Carvalho Chehab , linux-kernel@vger.kernel.org, Jonathan Corbet , Bartlomiej Zolnierkiewicz , Greg Kroah-Hartman , Jiri Slaby , dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org Subject: [PATCH v1 06/31] docs: console.txt: convert docs to ReST and rename to *.rst Date: Wed, 12 Jun 2019 15:38:09 -0300 Message-Id: X-Mailer: git-send-email 2.21.0 In-Reply-To: References: MIME-Version: 1.0 Sender: linux-fbdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fbdev@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Convert this small file to ReST in preparation for adding it to the driver-api book. While this is not part of the driver-api book, mark it as :orphan:, in order to avoid build warnings. Signed-off-by: Mauro Carvalho Chehab --- .../console/{console.txt => console.rst} | 63 ++++++++++--------- Documentation/fb/fbcon.rst | 4 +- drivers/tty/Kconfig | 2 +- 3 files changed, 38 insertions(+), 31 deletions(-) rename Documentation/console/{console.txt => console.rst} (80%) diff --git a/Documentation/console/console.txt b/Documentation/console/console.rst similarity index 80% rename from Documentation/console/console.txt rename to Documentation/console/console.rst index d73c2ab4beda..b374141b027e 100644 --- a/Documentation/console/console.txt +++ b/Documentation/console/console.rst @@ -1,3 +1,6 @@ +:orphan: + +=============== Console Drivers =============== @@ -17,25 +20,26 @@ of driver occupying the consoles.) They can only take over the console that is occupied by the system driver. In the same token, if the modular driver is released by the console, the system driver will take over. -Modular drivers, from the programmer's point of view, have to call: +Modular drivers, from the programmer's point of view, have to call:: do_take_over_console() - load and bind driver to console layer give_up_console() - unload driver; it will only work if driver is fully unbound -In newer kernels, the following are also available: +In newer kernels, the following are also available:: do_register_con_driver() do_unregister_con_driver() If sysfs is enabled, the contents of /sys/class/vtconsole can be examined. This shows the console backends currently registered by the -system which are named vtcon where is an integer from 0 to 15. Thus: +system which are named vtcon where is an integer from 0 to 15. +Thus:: ls /sys/class/vtconsole . .. vtcon0 vtcon1 -Each directory in /sys/class/vtconsole has 3 files: +Each directory in /sys/class/vtconsole has 3 files:: ls /sys/class/vtconsole/vtcon0 . .. bind name uevent @@ -46,27 +50,29 @@ What do these files signify? read, or acts to bind or unbind the driver to the virtual consoles when written to. The possible values are: - 0 - means the driver is not bound and if echo'ed, commands the driver + 0 + - means the driver is not bound and if echo'ed, commands the driver to unbind - 1 - means the driver is bound and if echo'ed, commands the driver to + 1 + - means the driver is bound and if echo'ed, commands the driver to bind - 2. name - read-only file. Shows the name of the driver in this format: + 2. name - read-only file. Shows the name of the driver in this format:: - cat /sys/class/vtconsole/vtcon0/name - (S) VGA+ + cat /sys/class/vtconsole/vtcon0/name + (S) VGA+ - '(S)' stands for a (S)ystem driver, i.e., it cannot be directly - commanded to bind or unbind + '(S)' stands for a (S)ystem driver, i.e., it cannot be directly + commanded to bind or unbind - 'VGA+' is the name of the driver + 'VGA+' is the name of the driver - cat /sys/class/vtconsole/vtcon1/name - (M) frame buffer device + cat /sys/class/vtconsole/vtcon1/name + (M) frame buffer device - In this case, '(M)' stands for a (M)odular driver, one that can be - directly commanded to bind or unbind. + In this case, '(M)' stands for a (M)odular driver, one that can be + directly commanded to bind or unbind. 3. uevent - ignore this file @@ -75,14 +81,17 @@ driver takes over the consoles vacated by the driver. Binding, on the other hand, will bind the driver to the consoles that are currently occupied by a system driver. -NOTE1: Binding and unbinding must be selected in Kconfig. It's under: +NOTE1: + Binding and unbinding must be selected in Kconfig. It's under:: -Device Drivers -> Character devices -> Support for binding and unbinding -console drivers + Device Drivers -> + Character devices -> + Support for binding and unbinding console drivers -NOTE2: If any of the virtual consoles are in KD_GRAPHICS mode, then binding or -unbinding will not succeed. An example of an application that sets the console -to KD_GRAPHICS is X. +NOTE2: + If any of the virtual consoles are in KD_GRAPHICS mode, then binding or + unbinding will not succeed. An example of an application that sets the + console to KD_GRAPHICS is X. How useful is this feature? This is very useful for console driver developers. By unbinding the driver from the console layer, one can unload the @@ -92,10 +101,10 @@ framebuffer console to VGA console and vice versa, this feature also makes this possible. (NOTE NOTE NOTE: Please read fbcon.txt under Documentation/fb for more details.) -Notes for developers: -===================== +Notes for developers +==================== -do_take_over_console() is now broken up into: +do_take_over_console() is now broken up into:: do_register_con_driver() do_bind_con_driver() - private function @@ -104,7 +113,7 @@ give_up_console() is a wrapper to do_unregister_con_driver(), and a driver must be fully unbound for this call to succeed. con_is_bound() will check if the driver is bound or not. -Guidelines for console driver writers: +Guidelines for console driver writers ===================================== In order for binding to and unbinding from the console to properly work, @@ -140,6 +149,4 @@ The current crop of console drivers should still work correctly, but binding and unbinding them may cause problems. With minimal fixes, these drivers can be made to work correctly. -========================== Antonino Daplas - diff --git a/Documentation/fb/fbcon.rst b/Documentation/fb/fbcon.rst index cfb9f7c38f18..22112718dd5d 100644 --- a/Documentation/fb/fbcon.rst +++ b/Documentation/fb/fbcon.rst @@ -187,7 +187,7 @@ the hardware. Thus, in a VGA console:: Assuming the VGA driver can be unloaded, one must first unbind the VGA driver from the console layer before unloading the driver. The VGA driver cannot be unloaded if it is still bound to the console layer. (See -Documentation/console/console.txt for more information). +Documentation/console/console.rst for more information). This is more complicated in the case of the framebuffer console (fbcon), because fbcon is an intermediate layer between the console and the drivers:: @@ -204,7 +204,7 @@ fbcon. Thus, there is no need to explicitly unbind the fbdev drivers from fbcon. So, how do we unbind fbcon from the console? Part of the answer is in -Documentation/console/console.txt. To summarize: +Documentation/console/console.rst. To summarize: Echo a value to the bind file that represents the framebuffer console driver. So assuming vtcon1 represents fbcon, then:: diff --git a/drivers/tty/Kconfig b/drivers/tty/Kconfig index 0e3e4dacbc12..1cb50f19d58c 100644 --- a/drivers/tty/Kconfig +++ b/drivers/tty/Kconfig @@ -93,7 +93,7 @@ config VT_HW_CONSOLE_BINDING select the console driver that will serve as the backend for the virtual terminals. - See for more + See for more information. For framebuffer console users, please refer to .