linux-kernel - Re: [PATCH 1/7] ark3116: (3rd try) Setup some basic infrastructure for new ark3116 driver.

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Date:	Tue, 27 Oct 2009 10:46:03 -0700
From:	Greg KH <greg@...ah.com>
To:	bart.hartgers@...il.com
Cc:	Greg Kroah-Hartman <gregkh@...e.de>, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/7] ark3116: (3rd try) Setup some basic infrastructure
 for new ark3116 driver.

On Sun, Oct 25, 2009 at 06:50:58PM +0100, bart.hartgers@...il.com wrote:
> Signed-off-by: Bart Hartgers <bart.hartgers@...il.com>
> ---
> Index: linux-2.6.32-rc4/drivers/usb/serial/ark3116.c
> ===================================================================
> --- linux-2.6.32-rc4.orig/drivers/usb/serial/ark3116.c	2009-10-18 14:25:02.000000000 +0200
> +++ linux-2.6.32-rc4/drivers/usb/serial/ark3116.c	2009-10-18 14:25:14.000000000 +0200
> @@ -1,4 +1,6 @@
>  /*
> + * Copyright (C) 2009 by Bart Hartgers (bart.hartgers+ark3116@...il.com)
> + * Original version:
>   * Copyright (C) 2006
>   *   Simon Schulz (ark3116_driver <at> auctionant.de)
>   *
> @@ -6,10 +8,13 @@
>   * - implements a driver for the arkmicro ark3116 chipset (vendor=0x6547,
>   *   productid=0x0232) (used in a datacable called KQ-U8A)
>   *
> - * - based on code by krisfx -> thanks !!
> - *   (see http://www.linuxquestions.org/questions/showthread.php?p=2184457#post2184457)
> + * Supports full modem status lines, break, hardware flow control. Does not
> + * support software flow control, since I do not know how to enable it in hw.
>   *
> - *  - based on logs created by usbsnoopy
> + * This driver is a essentially new implementation. I initially dug
> + * into the old ark3116.c driver and suddenly realized the ark3116 is
> + * a 16450 with a USB interface glued to it. See comments at the
> + * bottom of this file.
>   *
>   * This program is free software; you can redistribute it and/or modify it
>   * under the terms of the GNU General Public License as published by the
> @@ -19,15 +24,31 @@
>  
>  #include <linux/kernel.h>
>  #include <linux/init.h>
> +#include <asm/atomic.h>
> +#include <linux/ioctl.h>
>  #include <linux/tty.h>
> +#include <linux/tty_flip.h>
>  #include <linux/module.h>
>  #include <linux/usb.h>
>  #include <linux/usb/serial.h>
>  #include <linux/serial.h>
> +#include <linux/serial_reg.h>
>  #include <linux/uaccess.h>
> -
> +#include <linux/mutex.h>
>  
>  static int debug;
> +/*
> + * Version information
> + */
> +
> +#define DRIVER_VERSION "v0.3"
> +#define DRIVER_AUTHOR "Bart Hartgers <bart.hartgers+ark3116@...il.com>"
> +#define DRIVER_DESC "USB ARK3116 serial/IrDA driver"
> +#define DRIVER_DEV_DESC "ARK3116 RS232/IrDA"
> +#define DRIVER_NAME "ark3116"
> +
> +/* usb timeout of 1 second */
> +#define ARK_TIMEOUT (1*HZ)
>  
>  static struct usb_device_id id_table [] = {
>  	{ USB_DEVICE(0x6547, 0x0232) },
> @@ -45,6 +66,52 @@ static int is_irda(struct usb_serial *se
>  	return 0;
>  }
>  
> +struct ark3116_private {
> +	wait_queue_head_t       delta_msr_wait;
> +	struct async_icount	icount;
> +	int			irda;	/* 1 for irda device */
> +
> +	/* protects hw register updates */
> +	struct mutex		lock;
> +
> +	int			quot;	/* baudrate divisor */
> +	__u8			lcr;	/* line control register value */
> +	__u8			hcr;	/* handshake control register (0x8)
> +					 * value
> +					 */
> +	/* register values - updated asynchronously */
> +	atomic_t		mcr;
> +	atomic_t		msr;
> +	atomic_t		lsr;

These don't need to be atomic, please don't use them if they are not
needed.  Just use the lock to protect updating them if needed.

Care to respin this series based on the review so far?

thanks,

greg k-h
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