55082c0301
Use device managed functions to simplify error handling, reduce source code size, improve readability, and reduce the likelyhood of bugs. The conversion was done automatically with coccinelle using the following semantic patches. The semantic patches and the scripts used to generate this commit log are available at https://github.com/groeck/coccinelle-patches - Introduce local variable 'struct device *dev' and use it instead of dereferencing it repeatedly - Use devm_watchdog_register_driver() to register watchdog device Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com> Cc: Alexandre Torgue <alexandre.torgue@st.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
156 lines
3.8 KiB
C
156 lines
3.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Watchdog driver for the RTC based watchdog in STMP3xxx and i.MX23/28
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*
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* Author: Wolfram Sang <kernel@pengutronix.de>
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*
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* Copyright (C) 2011-12 Wolfram Sang, Pengutronix
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/watchdog.h>
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#include <linux/platform_device.h>
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#include <linux/stmp3xxx_rtc_wdt.h>
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#include <linux/notifier.h>
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#include <linux/reboot.h>
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#define WDOG_TICK_RATE 1000 /* 1 kHz clock */
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#define STMP3XXX_DEFAULT_TIMEOUT 19
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#define STMP3XXX_MAX_TIMEOUT (UINT_MAX / WDOG_TICK_RATE)
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static int heartbeat = STMP3XXX_DEFAULT_TIMEOUT;
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module_param(heartbeat, uint, 0);
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MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat period in seconds from 1 to "
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__MODULE_STRING(STMP3XXX_MAX_TIMEOUT) ", default "
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__MODULE_STRING(STMP3XXX_DEFAULT_TIMEOUT));
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static int wdt_start(struct watchdog_device *wdd)
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{
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struct device *dev = watchdog_get_drvdata(wdd);
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struct stmp3xxx_wdt_pdata *pdata = dev_get_platdata(dev);
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pdata->wdt_set_timeout(dev->parent, wdd->timeout * WDOG_TICK_RATE);
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return 0;
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}
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static int wdt_stop(struct watchdog_device *wdd)
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{
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struct device *dev = watchdog_get_drvdata(wdd);
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struct stmp3xxx_wdt_pdata *pdata = dev_get_platdata(dev);
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pdata->wdt_set_timeout(dev->parent, 0);
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return 0;
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}
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static int wdt_set_timeout(struct watchdog_device *wdd, unsigned new_timeout)
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{
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wdd->timeout = new_timeout;
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return wdt_start(wdd);
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}
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static const struct watchdog_info stmp3xxx_wdt_ident = {
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.options = WDIOF_MAGICCLOSE | WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
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.identity = "STMP3XXX RTC Watchdog",
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};
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static const struct watchdog_ops stmp3xxx_wdt_ops = {
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.owner = THIS_MODULE,
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.start = wdt_start,
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.stop = wdt_stop,
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.set_timeout = wdt_set_timeout,
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};
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static struct watchdog_device stmp3xxx_wdd = {
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.info = &stmp3xxx_wdt_ident,
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.ops = &stmp3xxx_wdt_ops,
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.min_timeout = 1,
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.max_timeout = STMP3XXX_MAX_TIMEOUT,
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.status = WATCHDOG_NOWAYOUT_INIT_STATUS,
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};
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static int wdt_notify_sys(struct notifier_block *nb, unsigned long code,
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void *unused)
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{
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switch (code) {
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case SYS_DOWN: /* keep enabled, system might crash while going down */
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break;
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case SYS_HALT: /* allow the system to actually halt */
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case SYS_POWER_OFF:
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wdt_stop(&stmp3xxx_wdd);
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break;
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}
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return NOTIFY_DONE;
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}
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static struct notifier_block wdt_notifier = {
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.notifier_call = wdt_notify_sys,
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};
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static int stmp3xxx_wdt_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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int ret;
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watchdog_set_drvdata(&stmp3xxx_wdd, dev);
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stmp3xxx_wdd.timeout = clamp_t(unsigned, heartbeat, 1, STMP3XXX_MAX_TIMEOUT);
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stmp3xxx_wdd.parent = dev;
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ret = devm_watchdog_register_device(dev, &stmp3xxx_wdd);
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if (ret < 0) {
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dev_err(dev, "cannot register watchdog device\n");
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return ret;
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}
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if (register_reboot_notifier(&wdt_notifier))
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dev_warn(dev, "cannot register reboot notifier\n");
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dev_info(dev, "initialized watchdog with heartbeat %ds\n",
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stmp3xxx_wdd.timeout);
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return 0;
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}
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static int stmp3xxx_wdt_remove(struct platform_device *pdev)
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{
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unregister_reboot_notifier(&wdt_notifier);
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return 0;
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}
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static int __maybe_unused stmp3xxx_wdt_suspend(struct device *dev)
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{
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struct watchdog_device *wdd = &stmp3xxx_wdd;
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if (watchdog_active(wdd))
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return wdt_stop(wdd);
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return 0;
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}
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static int __maybe_unused stmp3xxx_wdt_resume(struct device *dev)
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{
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struct watchdog_device *wdd = &stmp3xxx_wdd;
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if (watchdog_active(wdd))
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return wdt_start(wdd);
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return 0;
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}
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static SIMPLE_DEV_PM_OPS(stmp3xxx_wdt_pm_ops,
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stmp3xxx_wdt_suspend, stmp3xxx_wdt_resume);
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static struct platform_driver stmp3xxx_wdt_driver = {
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.driver = {
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.name = "stmp3xxx_rtc_wdt",
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.pm = &stmp3xxx_wdt_pm_ops,
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},
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.probe = stmp3xxx_wdt_probe,
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.remove = stmp3xxx_wdt_remove,
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};
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module_platform_driver(stmp3xxx_wdt_driver);
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MODULE_DESCRIPTION("STMP3XXX RTC Watchdog Driver");
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MODULE_LICENSE("GPL v2");
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MODULE_AUTHOR("Wolfram Sang <kernel@pengutronix.de>");
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