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

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Date:	Wed, 30 Jan 2008 12:00:03 +0100
From:	Jiri Slaby <jirislaby@...il.com>
To:	Bryan Wu <bryan.wu@...log.com>
CC:	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 01/30/2008 11:36 AM, Bryan Wu wrote:
> From: Mike Frysinger <michael.frysinger@...log.com>
> 
> initial char driver for otp memory
> (only read supported atm ... needs real examples/docs for write support)
> 
> Signed-off-by: Mike Frysinger <michael.frysinger@...log.com>
> Signed-off-by: Bryan Wu <bryan.wu@...log.com>
> ---
>  drivers/char/Kconfig    |   28 +++++++
>  drivers/char/Makefile   |    1 +
>  drivers/char/bfin-otp.c |  203 +++++++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 232 insertions(+), 0 deletions(-)
>  create mode 100644 drivers/char/bfin-otp.c
> 
[...]
> diff --git a/drivers/char/bfin-otp.c b/drivers/char/bfin-otp.c
> new file mode 100644
> index 0000000..896a987
> --- /dev/null
> +++ b/drivers/char/bfin-otp.c
> @@ -0,0 +1,203 @@
> +/*
> + * Blackfin On-Chip OTP Memory Interface
> + *  Supports BF52x/BF54x
> + *
> + * Copyright 2007-2008 Analog Devices Inc.
> + *
> + * Enter bugs at http://blackfin.uclinux.org/
> + *
> + * Licensed under the GPL-2 or later.
> + */
> +
> +#include <linux/cdev.h>
> +#include <linux/device.h>
> +#include <linux/errno.h>
> +#include <linux/fs.h>
> +#include <linux/init.h>
> +#include <linux/module.h>
> +#include <linux/mutex.h>
> +#include <linux/types.h>
> +
> +#include <asm/blackfin.h>
> +#include <asm/uaccess.h>
> +
> +#define stamp(fmt, args...) pr_debug("%s:%i: " fmt "\n", __func__, __LINE__, ## args)
> +#define stampit() stamp("here i am")
> +
> +#define DRIVER_NAME "bfin-otp"
> +#define PFX DRIVER_NAME ": "
> +
> +DEFINE_MUTEX(bfin_otp_lock);

static?

> +
> +/* OTP Boot ROM functions */
> +#define _BOOTROM_OTP_COMMAND           0xEF000018
> +#define _BOOTROM_OTP_READ              0xEF00001A
> +#define _BOOTROM_OTP_WRITE             0xEF00001C
[...]
> +/**
> + *	bfin_otp_init - Initialize module
> + *
> + *	Registers the device and notifier handler. Actual device
> + *	initialization is handled by bfin_otp_open().
> + */
> +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.

> +
> +	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.)?

> +
> +	printk(KERN_INFO PFX "initialized\n");
> +
> +	return 0;
> +}
--
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