linux-kernel - Re: Add the infamous Huawei E220 to option.c

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Message-ID: <20071129073303.1913505tnv2m8v0g@webmail.tugraz.at>
Date:	Thu, 29 Nov 2007 07:33:03 +0100
From:	Johann Wilhelm <johann.wilhelm@...dent.tugraz.at>
To:	Pete Zaitcev <zaitcev@...hat.com>
Cc:	linux-usb@...r.kernel.org, preining@...ic.at,
	kristoffer.ericson@...il.com, drussell@...hat.com,
	linux-kernel@...r.kernel.org
Subject: Re: Add the infamous Huawei E220 to option.c

Hi there,

Well your code basically looks nice... but keep in mind that there are  
several different E220-devices (in fact i know of 2 different PIDs...  
and I would be really surprised if they only use 2 of them...). So you  
should check all possible PIDs...

But in my opinion the the modul-load-order should be forced by udev...  
this should work and we only have 1 position to keep in mind if we eg.  
get a new E220, support for the E270 or something else...

73

Zitat von Pete Zaitcev <zaitcev@...hat.com>:

> Hi, All:
>
> It looks like the Huawei E220 saga is not over yet. A collegue of mine,
> David Russll, reported that the modem does not work reliably on Fedora 8,
> which does have the initializer in usb-storage.
>
> The problem stems from the fact that both option and usb-storage can bind
> to the modem when in storage mode: the former binds because of the storage
> class, the latter binds because of VID/PID match. The modprobe loads both,
> it's random which wins. If usb-storage wins, everything is fine. If option
> wins, it binds to modem still in storage mode and does not work.
>
> I propose we add the same initializer that usb-storage has to the option.
> This way no matter which driver wins the modem gets initialized. The
> patch is tested on David's modem, but I would like someone give it more
> testing.
>
> I dunno, do we want some kind of code sharing between storage and option?
> They both could use the normal usb_control_msg, I think.
>
> Also, from archives it looks like Johann may need PID 0x1004 added.
>
> Since we're on topic, David's modem has exactly same IDs as Norbert's,
> but works fine with the length of 1. Although it's possible that the
> firmware is different without different firmware reported in USB desc-
> riptors. Does anyone know a magic AT command? ATI or something?
> Norbert, please try my patch, maybe it'll work this time.
>
> And finally, pleas stop using that script from the polish website and
> above all quit using the generic serial subdriver. The option must
> work now with the patch. Please let me know if it fails.
>
> Thanks in advance,
> -- Pete
>
> diff -urp -X dontdiff  
> linux-2.6.23.1-42.fc8/drivers/usb/serial/option.c  
> linux-2.6.23.1-42.fc8.e220.1/drivers/usb/serial/option.c
> --- linux-2.6.23.1-42.fc8/drivers/usb/serial/option.c	2007-10-09  
> 13:31:38.000000000 -0700
> +++  
> linux-2.6.23.1-42.fc8.e220.1/drivers/usb/serial/option.c	2007-11-27  
> 21:36:11.000000000 -0800
> @@ -448,7 +448,7 @@ static void option_indat_callback(struct
>  			err = usb_submit_urb(urb, GFP_ATOMIC);
>  			if (err)
>  				printk(KERN_ERR "%s: resubmit read urb failed. "
> -					"(%d)", __FUNCTION__, err);
> +					"(%d)\n", __FUNCTION__, err);
>  		}
>  	}
>  	return;
> @@ -728,6 +728,35 @@ static int option_send_setup(struct usb_
>  	return 0;
>  }
>
> +static void option_start_huawei(struct usb_serial *serial)
> +{
> +	struct usb_device *dev = serial->dev;
> +	char *buf;
> +	int rc;
> +
> +	if (!(le16_to_cpu(dev->descriptor.idVendor) == HUAWEI_VENDOR_ID &&
> +	    le16_to_cpu(dev->descriptor.idProduct) == HUAWEI_PRODUCT_E220))
> +		return;
> +
> +	if ((buf = kmalloc(1, GFP_KERNEL)) == 0)
> +		goto err_buf;
> +
> +	buf[0] = 0x1;
> +	rc = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
> +		USB_REQ_SET_FEATURE, USB_TYPE_STANDARD | USB_RECIP_DEVICE,
> +		0x01, 0x0, buf, 1, 1000);
> +	if (rc) {
> +		printk(KERN_ERR "%s: HUAWEI E220 setup failed (%d)\n",
> +		    __FUNCTION__, rc);
> +	}
> +
> +	kfree(buf);
> +	return;
> +
> +err_buf:
> +	;
> +}
> +
>  static int option_startup(struct usb_serial *serial)
>  {
>  	int i, err;
> @@ -736,6 +765,8 @@ static int option_startup(struct usb_ser
>
>  	dbg("%s", __FUNCTION__);
>
> +	option_start_huawei(serial);
> +
>  	/* Now setup per port private data */
>  	for (i = 0; i < serial->num_ports; i++) {
>  		port = serial->port[i];
>


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