cregit-Linux how code gets into the kernel

Release 4.10 drivers/watchdog/cpu5wdt.c

Directory: drivers/watchdog
/*
 * sma cpu5 watchdog driver
 *
 * Copyright (C) 2003 Heiko Ronsdorf <hero@ihg.uni-duisburg.de>
 *
 * 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 Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */


#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/miscdevice.h>
#include <linux/fs.h>
#include <linux/ioport.h>
#include <linux/timer.h>
#include <linux/completion.h>
#include <linux/jiffies.h>
#include <linux/io.h>
#include <linux/uaccess.h>
#include <linux/watchdog.h>

/* adjustable parameters */


static int verbose;

static int port = 0x91;

static int ticks = 10000;
static DEFINE_SPINLOCK(cpu5wdt_lock);


#define PFX			"cpu5wdt: "


#define CPU5WDT_EXTENT          0x0A


#define CPU5WDT_STATUS_REG      0x00

#define CPU5WDT_TIME_A_REG      0x02

#define CPU5WDT_TIME_B_REG      0x03

#define CPU5WDT_MODE_REG        0x04

#define CPU5WDT_TRIGGER_REG     0x07

#define CPU5WDT_ENABLE_REG      0x08

#define CPU5WDT_RESET_REG       0x09


#define CPU5WDT_INTERVAL	(HZ/10+1)

/* some device data */

static struct {
	
struct completion stop;
	
int running;
	
struct timer_list timer;
	
int queue;
	
int default_ticks;
	
unsigned long inuse;
} 
cpu5wdt_device;

/* generic helper functions */


static void cpu5wdt_trigger(unsigned long unused) { if (verbose > 2) pr_debug("trigger at %i ticks\n", ticks); if (cpu5wdt_device.running) ticks--; spin_lock(&cpu5wdt_lock); /* keep watchdog alive */ outb(1, port + CPU5WDT_TRIGGER_REG); /* requeue?? */ if (cpu5wdt_device.queue && ticks) mod_timer(&cpu5wdt_device.timer, jiffies + CPU5WDT_INTERVAL); else { /* ticks doesn't matter anyway */ complete(&cpu5wdt_device.stop); } spin_unlock(&cpu5wdt_lock); }

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jiri slabyjiri slaby44.60%120.00%
joe perchesjoe perches33.45%120.00%
steven rostedtsteven rostedt11.15%120.00%
Total87100.00%5100.00%


static void cpu5wdt_reset(void) { ticks = cpu5wdt_device.default_ticks; if (verbose) pr_debug("reset (%i ticks)\n", (int) ticks); }

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static void cpu5wdt_start(void) { unsigned long flags; spin_lock_irqsave(&cpu5wdt_lock, flags); if (!cpu5wdt_device.queue) { cpu5wdt_device.queue = 1; outb(0, port + CPU5WDT_TIME_A_REG); outb(0, port + CPU5WDT_TIME_B_REG); outb(1, port + CPU5WDT_MODE_REG); outb(0, port + CPU5WDT_RESET_REG); outb(0, port + CPU5WDT_ENABLE_REG); mod_timer(&cpu5wdt_device.timer, jiffies + CPU5WDT_INTERVAL); } /* if process dies, counter is not decremented */ cpu5wdt_device.running++; spin_unlock_irqrestore(&cpu5wdt_lock, flags); }

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Total106100.00%3100.00%


static int cpu5wdt_stop(void) { unsigned long flags; spin_lock_irqsave(&cpu5wdt_lock, flags); if (cpu5wdt_device.running) cpu5wdt_device.running = 0; ticks = cpu5wdt_device.default_ticks; spin_unlock_irqrestore(&cpu5wdt_lock, flags); if (verbose) pr_crit("stop not possible\n"); return -EIO; }

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joe perchesjoe perches23.39%133.33%
Total59100.00%3100.00%

/* filesystem operations */
static int cpu5wdt_open(struct inode *inode, struct file *file) { if (test_and_set_bit(0, &cpu5wdt_device.inuse)) return -EBUSY; return nonseekable_open(inode, file); }

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static int cpu5wdt_release(struct inode *inode, struct file *file) { clear_bit(0, &cpu5wdt_device.inuse); return 0; }

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static long cpu5wdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { void __user *argp = (void __user *)arg; int __user *p = argp; unsigned int value; static const struct watchdog_info ident = { .options = WDIOF_CARDRESET, .identity = "CPU5 WDT", }; switch (cmd) { case WDIOC_GETSUPPORT: if (copy_to_user(argp, &ident, sizeof(ident))) return -EFAULT; break; case WDIOC_GETSTATUS: value = inb(port + CPU5WDT_STATUS_REG); value = (value >> 2) & 1; return put_user(value, p); case WDIOC_GETBOOTSTATUS: return put_user(0, p); case WDIOC_SETOPTIONS: if (get_user(value, p)) return -EFAULT; if (value & WDIOS_ENABLECARD) cpu5wdt_start(); if (value & WDIOS_DISABLECARD) cpu5wdt_stop(); break; case WDIOC_KEEPALIVE: cpu5wdt_reset(); break; default: return -ENOTTY; } return 0; }

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alan coxalan cox2614.44%111.11%
al viroal viro126.67%111.11%
samuel tardieusamuel tardieu10.56%111.11%
andrew mortonandrew morton10.56%111.11%
Total180100.00%9100.00%


static ssize_t cpu5wdt_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { if (!count) return -EIO; cpu5wdt_reset(); return count; }

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static const struct file_operations cpu5wdt_fops = { .owner = THIS_MODULE, .llseek = no_llseek, .unlocked_ioctl = cpu5wdt_ioctl, .open = cpu5wdt_open, .write = cpu5wdt_write, .release = cpu5wdt_release, }; static struct miscdevice cpu5wdt_misc = { .minor = WATCHDOG_MINOR, .name = "watchdog", .fops = &cpu5wdt_fops, }; /* init/exit function */
static int cpu5wdt_init(void) { unsigned int val; int err; if (verbose) pr_debug("port=0x%x, verbose=%i\n", port, verbose); init_completion(&cpu5wdt_device.stop); cpu5wdt_device.queue = 0; setup_timer(&cpu5wdt_device.timer, cpu5wdt_trigger, 0); cpu5wdt_device.default_ticks = ticks; if (!request_region(port, CPU5WDT_EXTENT, PFX)) { pr_err("request_region failed\n"); err = -EBUSY; goto no_port; } /* watchdog reboot? */ val = inb(port + CPU5WDT_STATUS_REG); val = (val >> 2) & 1; if (!val) pr_info("sorry, was my fault\n"); err = misc_register(&cpu5wdt_misc); if (err < 0) { pr_err("misc_register failed\n"); goto no_misc; } pr_info("init success\n"); return 0; no_misc: release_region(port, CPU5WDT_EXTENT); no_port: return err; }

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alexey dobriyanalexey dobriyan63.68%120.00%
jiri slabyjiri slaby10.61%120.00%
Total163100.00%5100.00%


static int cpu5wdt_init_module(void) { return cpu5wdt_init(); }

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static void cpu5wdt_exit(void) { if (cpu5wdt_device.queue) { cpu5wdt_device.queue = 0; wait_for_completion(&cpu5wdt_device.stop); del_timer(&cpu5wdt_device.timer); } misc_deregister(&cpu5wdt_misc); release_region(port, CPU5WDT_EXTENT); }

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steven rostedtsteven rostedt11.96%133.33%
Total51100.00%3100.00%


static void cpu5wdt_exit_module(void) { cpu5wdt_exit(); }

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/* module entry points */ module_init(cpu5wdt_init_module); module_exit(cpu5wdt_exit_module); MODULE_AUTHOR("Heiko Ronsdorf <hero@ihg.uni-duisburg.de>"); MODULE_DESCRIPTION("sma cpu5 watchdog driver"); MODULE_SUPPORTED_DEVICE("sma cpu5 watchdog"); MODULE_LICENSE("GPL"); module_param(port, int, 0); MODULE_PARM_DESC(port, "base address of watchdog card, default is 0x91"); module_param(verbose, int, 0); MODULE_PARM_DESC(verbose, "be verbose, default is 0 (no)"); module_param(ticks, int, 0); MODULE_PARM_DESC(ticks, "count down ticks, default is 10000");

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dave jonesdave jones81174.68%15.00%
alan coxalan cox13011.97%15.00%
wim van sebroeckwim van sebroeck474.33%525.00%
joe perchesjoe perches302.76%15.00%
andrew mortonandrew morton171.57%315.00%
al viroal viro131.20%15.00%
jiri slabyjiri slaby90.83%15.00%
devendra nagadevendra naga80.74%15.00%
steven rostedtsteven rostedt60.55%15.00%
alexey dobriyanalexey dobriyan60.55%15.00%
axel linaxel lin40.37%15.00%
tim schmielautim schmielau30.28%15.00%
samuel tardieusamuel tardieu10.09%15.00%
arjan van de venarjan van de ven10.09%15.00%
Total1086100.00%20100.00%
Directory: drivers/watchdog
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