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Release 4.14 drivers/watchdog/stmp3xxx_rtc_wdt.c

Directory: drivers/watchdog
/*
 * Watchdog driver for the RTC based watchdog in STMP3xxx and i.MX23/28
 *
 * Author: Wolfram Sang <kernel@pengutronix.de>
 *
 * Copyright (C) 2011-12 Wolfram Sang, Pengutronix
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation.
 */
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/watchdog.h>
#include <linux/platform_device.h>
#include <linux/stmp3xxx_rtc_wdt.h>
#include <linux/notifier.h>
#include <linux/reboot.h>


#define WDOG_TICK_RATE 1000 
/* 1 kHz clock */

#define STMP3XXX_DEFAULT_TIMEOUT 19

#define STMP3XXX_MAX_TIMEOUT (UINT_MAX / WDOG_TICK_RATE)


static int heartbeat = STMP3XXX_DEFAULT_TIMEOUT;
module_param(heartbeat, uint, 0);
MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat period in seconds from 1 to "
		 __MODULE_STRING(STMP3XXX_MAX_TIMEOUT) ", default "
		 __MODULE_STRING(STMP3XXX_DEFAULT_TIMEOUT));


static int wdt_start(struct watchdog_device *wdd) { struct device *dev = watchdog_get_drvdata(wdd); struct stmp3xxx_wdt_pdata *pdata = dev_get_platdata(dev); pdata->wdt_set_timeout(dev->parent, wdd->timeout * WDOG_TICK_RATE); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Wolfram Sang4693.88%150.00%
Jingoo Han36.12%150.00%
Total49100.00%2100.00%


static int wdt_stop(struct watchdog_device *wdd) { struct device *dev = watchdog_get_drvdata(wdd); struct stmp3xxx_wdt_pdata *pdata = dev_get_platdata(dev); pdata->wdt_set_timeout(dev->parent, 0); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Wolfram Sang4293.33%150.00%
Jingoo Han36.67%150.00%
Total45100.00%2100.00%


static int wdt_set_timeout(struct watchdog_device *wdd, unsigned new_timeout) { wdd->timeout = new_timeout; return wdt_start(wdd); }

Contributors

PersonTokensPropCommitsCommitProp
Wolfram Sang26100.00%1100.00%
Total26100.00%1100.00%

static const struct watchdog_info stmp3xxx_wdt_ident = { .options = WDIOF_MAGICCLOSE | WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING, .identity = "STMP3XXX RTC Watchdog", }; static const struct watchdog_ops stmp3xxx_wdt_ops = { .owner = THIS_MODULE, .start = wdt_start, .stop = wdt_stop, .set_timeout = wdt_set_timeout, }; static struct watchdog_device stmp3xxx_wdd = { .info = &stmp3xxx_wdt_ident, .ops = &stmp3xxx_wdt_ops, .min_timeout = 1, .max_timeout = STMP3XXX_MAX_TIMEOUT, .status = WATCHDOG_NOWAYOUT_INIT_STATUS, };
static int wdt_notify_sys(struct notifier_block *nb, unsigned long code, void *unused) { switch (code) { case SYS_DOWN: /* keep enabled, system might crash while going down */ break; case SYS_HALT: /* allow the system to actually halt */ case SYS_POWER_OFF: wdt_stop(&stmp3xxx_wdd); break; } return NOTIFY_DONE; }

Contributors

PersonTokensPropCommitsCommitProp
Harald Geyer47100.00%1100.00%
Total47100.00%1100.00%

static struct notifier_block wdt_notifier = { .notifier_call = wdt_notify_sys, };
static int stmp3xxx_wdt_probe(struct platform_device *pdev) { int ret; watchdog_set_drvdata(&stmp3xxx_wdd, &pdev->dev); stmp3xxx_wdd.timeout = clamp_t(unsigned, heartbeat, 1, STMP3XXX_MAX_TIMEOUT); stmp3xxx_wdd.parent = &pdev->dev; ret = watchdog_register_device(&stmp3xxx_wdd); if (ret < 0) { dev_err(&pdev->dev, "cannot register watchdog device\n"); return ret; } if (register_reboot_notifier(&wdt_notifier)) dev_warn(&pdev->dev, "cannot register reboot notifier\n"); dev_info(&pdev->dev, "initialized watchdog with heartbeat %ds\n", stmp3xxx_wdd.timeout); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Wolfram Sang8676.11%133.33%
Harald Geyer1815.93%133.33%
Pratyush Anand97.96%133.33%
Total113100.00%3100.00%


static int stmp3xxx_wdt_remove(struct platform_device *pdev) { unregister_reboot_notifier(&wdt_notifier); watchdog_unregister_device(&stmp3xxx_wdd); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Wolfram Sang2076.92%150.00%
Harald Geyer623.08%150.00%
Total26100.00%2100.00%


static int __maybe_unused stmp3xxx_wdt_suspend(struct device *dev) { struct watchdog_device *wdd = &stmp3xxx_wdd; if (watchdog_active(wdd)) return wdt_stop(wdd); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Janusz Użycki36100.00%1100.00%
Total36100.00%1100.00%


static int __maybe_unused stmp3xxx_wdt_resume(struct device *dev) { struct watchdog_device *wdd = &stmp3xxx_wdd; if (watchdog_active(wdd)) return wdt_start(wdd); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Janusz Użycki36100.00%1100.00%
Total36100.00%1100.00%

static SIMPLE_DEV_PM_OPS(stmp3xxx_wdt_pm_ops, stmp3xxx_wdt_suspend, stmp3xxx_wdt_resume); static struct platform_driver stmp3xxx_wdt_driver = { .driver = { .name = "stmp3xxx_rtc_wdt", .pm = &stmp3xxx_wdt_pm_ops, }, .probe = stmp3xxx_wdt_probe, .remove = stmp3xxx_wdt_remove, }; module_platform_driver(stmp3xxx_wdt_driver); MODULE_DESCRIPTION("STMP3XXX RTC Watchdog Driver"); MODULE_LICENSE("GPL v2"); MODULE_AUTHOR("Wolfram Sang <kernel@pengutronix.de>");

Overall Contributors

PersonTokensPropCommitsCommitProp
Wolfram Sang41168.16%233.33%
Harald Geyer8914.76%116.67%
Janusz Użycki8814.59%116.67%
Pratyush Anand91.49%116.67%
Jingoo Han61.00%116.67%
Total603100.00%6100.00%
Directory: drivers/watchdog
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