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Release 4.10 drivers/watchdog/geodewdt.c

Directory: drivers/watchdog
/* Watchdog timer for machines with the CS5535/CS5536 companion chip
 *
 * Copyright (C) 2006-2007, Advanced Micro Devices, Inc.
 * Copyright (C) 2009  Andres Salomon <dilinger@collabora.co.uk>
 *
 * 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.
 */


#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/types.h>
#include <linux/miscdevice.h>
#include <linux/watchdog.h>
#include <linux/fs.h>
#include <linux/platform_device.h>
#include <linux/reboot.h>
#include <linux/uaccess.h>

#include <linux/cs5535.h>


#define GEODEWDT_HZ 500

#define GEODEWDT_SCALE 6

#define GEODEWDT_MAX_SECONDS 131


#define WDT_FLAGS_OPEN 1

#define WDT_FLAGS_ORPHAN 2


#define DRV_NAME "geodewdt"

#define WATCHDOG_NAME "Geode GX/LX WDT"

#define WATCHDOG_TIMEOUT 60


static int timeout = WATCHDOG_TIMEOUT;
module_param(timeout, int, 0);
MODULE_PARM_DESC(timeout,
	"Watchdog timeout in seconds. 1<= timeout <=131, default="
				__MODULE_STRING(WATCHDOG_TIMEOUT) ".");


static bool nowayout = WATCHDOG_NOWAYOUT;
module_param(nowayout, bool, 0);
MODULE_PARM_DESC(nowayout,
	"Watchdog cannot be stopped once started (default="
				__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");


static struct platform_device *geodewdt_platform_device;

static unsigned long wdt_flags;

static struct cs5535_mfgpt_timer *wdt_timer;

static int safe_close;


static void geodewdt_ping(void) { /* Stop the counter */ cs5535_mfgpt_write(wdt_timer, MFGPT_REG_SETUP, 0); /* Reset the counter */ cs5535_mfgpt_write(wdt_timer, MFGPT_REG_COUNTER, 0); /* Enable the counter */ cs5535_mfgpt_write(wdt_timer, MFGPT_REG_SETUP, MFGPT_SETUP_CNTEN); }

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jordan crousejordan crouse3592.11%150.00%
andres salomonandres salomon37.89%150.00%
Total38100.00%2100.00%


static void geodewdt_disable(void) { cs5535_mfgpt_write(wdt_timer, MFGPT_REG_SETUP, 0); cs5535_mfgpt_write(wdt_timer, MFGPT_REG_COUNTER, 0); }

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jordan crousejordan crouse2492.31%150.00%
andres salomonandres salomon27.69%150.00%
Total26100.00%2100.00%


static int geodewdt_set_heartbeat(int val) { if (val < 1 || val > GEODEWDT_MAX_SECONDS) return -EINVAL; cs5535_mfgpt_write(wdt_timer, MFGPT_REG_SETUP, 0); cs5535_mfgpt_write(wdt_timer, MFGPT_REG_CMP2, val * GEODEWDT_HZ); cs5535_mfgpt_write(wdt_timer, MFGPT_REG_COUNTER, 0); cs5535_mfgpt_write(wdt_timer, MFGPT_REG_SETUP, MFGPT_SETUP_CNTEN); timeout = val; return 0; }

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jordan crousejordan crouse6494.12%150.00%
andres salomonandres salomon45.88%150.00%
Total68100.00%2100.00%


static int geodewdt_open(struct inode *inode, struct file *file) { if (test_and_set_bit(WDT_FLAGS_OPEN, &wdt_flags)) return -EBUSY; if (!test_and_clear_bit(WDT_FLAGS_ORPHAN, &wdt_flags)) __module_get(THIS_MODULE); geodewdt_ping(); return nonseekable_open(inode, file); }

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static int geodewdt_release(struct inode *inode, struct file *file) { if (safe_close) { geodewdt_disable(); module_put(THIS_MODULE); } else { pr_crit("Unexpected close - watchdog is not stopping\n"); geodewdt_ping(); set_bit(WDT_FLAGS_ORPHAN, &wdt_flags); } clear_bit(WDT_FLAGS_OPEN, &wdt_flags); safe_close = 0; return 0; }

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jordan crousejordan crouse6296.88%150.00%
joe perchesjoe perches23.12%150.00%
Total64100.00%2100.00%


static ssize_t geodewdt_write(struct file *file, const char __user *data, size_t len, loff_t *ppos) { if (len) { if (!nowayout) { size_t i; safe_close = 0; for (i = 0; i != len; i++) { char c; if (get_user(c, data + i)) return -EFAULT; if (c == 'V') safe_close = 1; } } geodewdt_ping(); } return len; }

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jordan crousejordan crouse93100.00%1100.00%
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static long geodewdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { void __user *argp = (void __user *)arg; int __user *p = argp; int interval; static const struct watchdog_info ident = { .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE, .firmware_version = 1, .identity = WATCHDOG_NAME, }; switch (cmd) { case WDIOC_GETSUPPORT: return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0; break; case WDIOC_GETSTATUS: case WDIOC_GETBOOTSTATUS: return put_user(0, p); case WDIOC_SETOPTIONS: { int options, ret = -EINVAL; if (get_user(options, p)) return -EFAULT; if (options & WDIOS_DISABLECARD) { geodewdt_disable(); ret = 0; } if (options & WDIOS_ENABLECARD) { geodewdt_ping(); ret = 0; } return ret; } case WDIOC_KEEPALIVE: geodewdt_ping(); return 0; case WDIOC_SETTIMEOUT: if (get_user(interval, p)) return -EFAULT; if (geodewdt_set_heartbeat(interval)) return -EINVAL; /* Fall through */ case WDIOC_GETTIMEOUT: return put_user(timeout, p); default: return -ENOTTY; } return 0; }

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jordan crousejordan crouse17577.43%120.00%
wim van sebroeckwim van sebroeck5122.57%480.00%
Total226100.00%5100.00%

static const struct file_operations geodewdt_fops = { .owner = THIS_MODULE, .llseek = no_llseek, .write = geodewdt_write, .unlocked_ioctl = geodewdt_ioctl, .open = geodewdt_open, .release = geodewdt_release, }; static struct miscdevice geodewdt_miscdev = { .minor = WATCHDOG_MINOR, .name = "watchdog", .fops = &geodewdt_fops, };
static int __init geodewdt_probe(struct platform_device *dev) { int ret; wdt_timer = cs5535_mfgpt_alloc_timer(MFGPT_TIMER_ANY, MFGPT_DOMAIN_WORKING); if (!wdt_timer) { pr_err("No timers were available\n"); return -ENODEV; } /* Set up the timer */ cs5535_mfgpt_write(wdt_timer, MFGPT_REG_SETUP, GEODEWDT_SCALE | (3 << 8)); /* Set up comparator 2 to reset when the event fires */ cs5535_mfgpt_toggle_event(wdt_timer, MFGPT_CMP2, MFGPT_EVENT_RESET, 1); /* Set up the initial timeout */ cs5535_mfgpt_write(wdt_timer, MFGPT_REG_CMP2, timeout * GEODEWDT_HZ); ret = misc_register(&geodewdt_miscdev); return ret; }

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jordan crousejordan crouse8189.01%125.00%
andres salomonandres salomon77.69%125.00%
joe perchesjoe perches22.20%125.00%
jean delvarejean delvare11.10%125.00%
Total91100.00%4100.00%


static int geodewdt_remove(struct platform_device *dev) { misc_deregister(&geodewdt_miscdev); return 0; }

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jordan crousejordan crouse20100.00%1100.00%
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static void geodewdt_shutdown(struct platform_device *dev) { geodewdt_disable(); }

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jordan crousejordan crouse14100.00%1100.00%
Total14100.00%1100.00%

static struct platform_driver geodewdt_driver = { .remove = geodewdt_remove, .shutdown = geodewdt_shutdown, .driver = { .name = DRV_NAME, }, };
static int __init geodewdt_init(void) { int ret; geodewdt_platform_device = platform_device_register_simple(DRV_NAME, -1, NULL, 0); if (IS_ERR(geodewdt_platform_device)) return PTR_ERR(geodewdt_platform_device); ret = platform_driver_probe(&geodewdt_driver, geodewdt_probe); if (ret) goto err; return 0; err: platform_device_unregister(geodewdt_platform_device); return ret; }

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jordan crousejordan crouse5275.36%150.00%
jean delvarejean delvare1724.64%150.00%
Total69100.00%2100.00%


static void __exit geodewdt_exit(void) { platform_device_unregister(geodewdt_platform_device); platform_driver_unregister(&geodewdt_driver); }

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jordan crousejordan crouse20100.00%1100.00%
Total20100.00%1100.00%

module_init(geodewdt_init); module_exit(geodewdt_exit); MODULE_AUTHOR("Advanced Micro Devices, Inc"); MODULE_DESCRIPTION("Geode GX/LX Watchdog Driver"); MODULE_LICENSE("GPL");

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jordan crousejordan crouse93889.85%110.00%
wim van sebroeckwim van sebroeck565.36%660.00%
andres salomonandres salomon212.01%110.00%
jean delvarejean delvare181.72%110.00%
joe perchesjoe perches111.05%110.00%
Total1044100.00%10100.00%
Directory: drivers/watchdog
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