From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1763416AbYJMJrA (ORCPT ); Mon, 13 Oct 2008 05:47:00 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1761158AbYJMJhx (ORCPT ); Mon, 13 Oct 2008 05:37:53 -0400 Received: from earthlight.etchedpixels.co.uk ([81.2.110.250]:48652 "EHLO lxorguk.ukuu.org.uk" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1757335AbYJMJhv (ORCPT ); Mon, 13 Oct 2008 05:37:51 -0400 From: Alan Cox Subject: [PATCH 37/80] tty: Cris has a nice RS485 ioctl so we should steal it To: torvalds@linux-foundation.org, linux-kernel@vger.kernel.org Date: Mon, 13 Oct 2008 10:37:48 +0100 Message-ID: <20081013093741.21645.21338.stgit@localhost.localdomain> In-Reply-To: <20081013092758.21645.2359.stgit@localhost.localdomain> References: <20081013092758.21645.2359.stgit@localhost.localdomain> User-Agent: StGIT/0.14.2 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Alan Cox JP Tosoni observed: "About a RS485 ioctl: could you consider the attached files which are already in the Linux kernel (in include/asm-cris). They define a TIOCSERSETRS485 (ioctl.h), and the data structure (rs485.h) with allows to specify timings. Sounds just like what we want ?" and he's right: sort of. Rework the structure to use flag bits and make the time delay a fixed sized field so we don't get 32/64bit problems. Add the ioctls to x86 so that people know what to add to their platform of choice. Signed-off-by: Alan Cox --- include/asm-x86/ioctls.h | 2 ++ include/linux/serial.h | 16 ++++++++++++++++ 2 files changed, 18 insertions(+), 0 deletions(-) diff --git a/include/asm-x86/ioctls.h b/include/asm-x86/ioctls.h index 3366035..1a8ac45 100644 --- a/include/asm-x86/ioctls.h +++ b/include/asm-x86/ioctls.h @@ -51,6 +51,8 @@ #define TCSETS2 _IOW('T', 0x2B, struct termios2) #define TCSETSW2 _IOW('T', 0x2C, struct termios2) #define TCSETSF2 _IOW('T', 0x2D, struct termios2) +#define TIOCGRS485 0x542E +#define TIOCSRS485 0x542F #define TIOCGPTN _IOR('T', 0x30, unsigned int) /* Get Pty Number (of pty-mux device) */ #define TIOCSPTLCK _IOW('T', 0x31, int) /* Lock/unlock Pty */ diff --git a/include/linux/serial.h b/include/linux/serial.h index deb7143..1ea8d92 100644 --- a/include/linux/serial.h +++ b/include/linux/serial.h @@ -173,6 +173,22 @@ struct serial_icounter_struct { int reserved[9]; }; +/* + * Serial interface for controlling RS485 settings on chips with suitable + * support. Set with TIOCSRS485 and get with TIOCGRS485 if supported by your + * platform. The set function returns the new state, with any unsupported bits + * reverted appropriately. + */ + +struct serial_rs485 { + __u32 flags; /* RS485 feature flags */ +#define SER_RS485_ENABLED (1 << 0) +#define SER_RS485_RTS_ON_SEND (1 << 1) +#define SER_RS485_RTS_AFTER_SEND (1 << 2) + __u32 delay_rts_before_send; /* Milliseconds */ + __u32 padding[6]; /* Memory is cheap, new structs + are a royal PITA .. */ +}; #ifdef __KERNEL__ #include