linux-kernel - Re: [PATCH 1/1] [Blackfin] char driver for Blackfin on-chip OTP memory

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Date:	Wed, 30 Jan 2008 08:19:06 -0500
From:	"Mike Frysinger" <vapier.adi@...il.com>
To:	"Jiri Slaby" <jirislaby@...il.com>
Cc:	"Bryan Wu" <bryan.wu@...log.com>, linux-kernel@...r.kernel.org,
	"Mike Frysinger" <michael.frysinger@...log.com>
Subject: Re: [PATCH 1/1] [Blackfin] char driver for Blackfin on-chip OTP memory

On Jan 30, 2008 6:00 AM, Jiri Slaby <jirislaby@...il.com> wrote:
> On 01/30/2008 11:36 AM, Bryan Wu wrote:
> > +DEFINE_MUTEX(bfin_otp_lock);
>
> static?

the macro threw me ... fixed now, thanks

> > +static int __init bfin_otp_init(void)
> > +{
> > +     int ret;
> > +
> > +     stampit();
> > +
> > +     ret = alloc_chrdev_region(&bfin_otp_dev_node, 0, 1, "otp");
> > +     if (ret) {
> > +             printk(KERN_ERR PFX "unable to get a char device\n");
> > +             return ret;
> > +     }
> > +
> > +     cdev_init(&bfin_otp_cdev, &bfin_otp_fops);
> > +     bfin_otp_cdev.owner = THIS_MODULE;
> > +     bfin_otp_cdev.ops = &bfin_otp_fops;
>
> You don't need to set the fops again.

i did research this a bit but the information on the topic seemed
spotty and usage was inconsistent ... i guess recent things have
smartened up, so i'll drop the assignment

> > +     ret = cdev_add(&bfin_otp_cdev, bfin_otp_dev_node, 1);
> > +     if (ret) {
> > +             unregister_chrdev_region(bfin_otp_dev_node, 1);
> > +             printk(KERN_ERR PFX "unable to register char device\n");
> > +             return ret;
> > +     }
> > +
> > +     bfin_otp_class = class_create(THIS_MODULE, "otp");
> > +     device_create(bfin_otp_class, NULL, bfin_otp_dev_node, "otp");
>
> Anyway, wouldn't be easier/better to use misc.c functionality here
> (misc_register() et al.)?

probably ... i just didnt want to statically allocate a number in the
range that would be Blackfin specific ...
-mike
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