Hi Wim.
Not much of my area so only some nitpicking stuff.
> /*
> * Watchdog implementation for GPI h/w found on PMC-Sierra RM9xxx
> * chips.
> *
> * Copyright (C) 2004 by Basler Vision Technologies AG
> * Author: Thomas Koeller <thomas.koeller@xxxxxxxxxxxxx>
> *
> * This program is free software; you can redistribute it and/or modify
We have COPYING in top level directory. No need to include GPL here.
> #define CPGIG1ER 0x0054
>
>
>
> /* Function prototypes */
Too many empty lines. Get it down to 2. Seen on many places.
> static int __init wdt_gpi_probe(struct device *);
> static int __exit wdt_gpi_remove(struct device *);
> static void wdt_gpi_start(void);
> static void wdt_gpi_stop(void);
> static void wdt_gpi_set_timeout(unsigned int);
3 prototpyes not needed
> static int wdt_gpi_open(struct inode *, struct file *);
> static int wdt_gpi_release(struct inode *, struct file *);
> static ssize_t wdt_gpi_write(struct file *, const char __user *, size_t, loff_t *);
> static long wdt_gpi_ioctl(struct file *, unsigned int, unsigned long);
> static const struct resource *wdt_gpi_get_resource(struct platform_device *, const char *, unsigned int);
80 char coloum
Prototype not needed.
> /* These are set from device resources */
> static void __iomem * wd_regs;
Good to see code annotated.
I assume sparse did not give any warnings on this code?
> /* Module arguments */
> static int timeout = MAX_TIMEOUT_SECONDS;
> module_param(timeout, int, 0444);
> static unsigned long resetaddr = 0xbffdc200;
> module_param(resetaddr, ulong, 0444);
> static unsigned long flagaddr = 0xbffdc104;
> module_param(flagaddr, ulong, 0444);
> static int powercycle = 0;
> module_param(powercycle, bool, 0444);
>
> static int nowayout = WATCHDOG_NOWAYOUT;
> module_param(nowayout, bool, 0444);
Locate parameter descriptions clode to parameter definition - not in
bottom of file.
> static struct device_driver wdt_gpi_driver = {
> .name = (char *) wdt_gpi_name,
If this cast is really needed then struct device_driver ought to be updated?
> static int __init wdt_gpi_probe(struct device *dev)
> {
> int res;
> struct platform_device * const pdv = to_platform_device(dev);
> const struct resource
> * const rr = wdt_gpi_get_resource(pdv, WDT_RESOURCE_REGS,
> IORESOURCE_MEM),
> * const ri = wdt_gpi_get_resource(pdv, WDT_RESOURCE_IRQ,
> IORESOURCE_IRQ),
> * const rc = wdt_gpi_get_resource(pdv, WDT_RESOURCE_COUNTER,
Separate variable definition and assignment => nicer code.
> static long
> wdt_gpi_ioctl(struct file *f, unsigned int cmd, unsigned long arg)
> {
arg is a __user pointer - why hide this fact?
> res = __copy_to_user((void __user *)arg, &wdinfo, size) ?
> -EFAULT : size;
then you get rid of this cast.
And code this as if () else
Using ?: is just ugly here.
> case WDIOC_GETBOOTSTATUS:
> stat = (*(volatile char *) flagaddr & 0x01)
> ? WDIOF_CARDRESET : 0;
Use of volatile almost always indicate a bug.
Please explain why volatile is needed and consider the other options.
> printk("%s: timeout set to %u seconds\n",
> wdt_gpi_name, timeout);
I just noticed this pringk miss a <KERNEL_DEBUG> or similar specifier.
I guess this is all of them.
> if (!unlikely(__raw_readl(wd_regs + 0x0008) & 0x1))
> return IRQ_NONE;
> __raw_writel(0x1, wd_regs + 0x0008);
Magics suchs as '0x0008' deserve a comment.
> *(volatile char *) flagaddr |= 0x01;
> *(volatile char *) resetaddr = powercycle ? 0x01 : 0x2;
volatile again...
> MODULE_AUTHOR("Thomas Koeller <thomas.koeller@xxxxxxxxxxxxx>");
> MODULE_DESCRIPTION("Basler eXcite watchdog driver for gpi devices");
> MODULE_VERSION("0.1");
> MODULE_LICENSE("GPL");
> MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
These five tags belongs in the start of the file.
> MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds");
> MODULE_PARM_DESC(resetaddr, "Address to write to to force a reset");
> MODULE_PARM_DESC(flagaddr, "Address to write to boot flags to");
> MODULE_PARM_DESC(nowayout, "Watchdog cannot be disabled once started");
> MODULE_PARM_DESC(powercycle, "Cycle power if watchdog expires");
Same here - but already noted.
Sam
