// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) Nokia Corporation
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*
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* Written by Timo Kokkonen <timo.t.kokkonen at nokia.com>
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/kernel.h>
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#include <linux/watchdog.h>
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#include <linux/platform_device.h>
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#include <linux/mfd/twl.h>
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#define TWL4030_WATCHDOG_CFG_REG_OFFS 0x3
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static bool nowayout = WATCHDOG_NOWAYOUT;
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module_param(nowayout, bool, 0);
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MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started "
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"(default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
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static int twl4030_wdt_write(unsigned char val)
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{
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return twl_i2c_write_u8(TWL_MODULE_PM_RECEIVER, val,
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TWL4030_WATCHDOG_CFG_REG_OFFS);
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}
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static int twl4030_wdt_start(struct watchdog_device *wdt)
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{
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return twl4030_wdt_write(wdt->timeout + 1);
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}
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static int twl4030_wdt_stop(struct watchdog_device *wdt)
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{
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return twl4030_wdt_write(0);
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}
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static int twl4030_wdt_set_timeout(struct watchdog_device *wdt,
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unsigned int timeout)
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{
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wdt->timeout = timeout;
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return 0;
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}
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static const struct watchdog_info twl4030_wdt_info = {
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.options = WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING,
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.identity = "TWL4030 Watchdog",
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};
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static const struct watchdog_ops twl4030_wdt_ops = {
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.owner = THIS_MODULE,
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.start = twl4030_wdt_start,
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.stop = twl4030_wdt_stop,
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.set_timeout = twl4030_wdt_set_timeout,
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};
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static int twl4030_wdt_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct watchdog_device *wdt;
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wdt = devm_kzalloc(dev, sizeof(*wdt), GFP_KERNEL);
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if (!wdt)
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return -ENOMEM;
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wdt->info = &twl4030_wdt_info;
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wdt->ops = &twl4030_wdt_ops;
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wdt->status = 0;
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wdt->timeout = 30;
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wdt->min_timeout = 1;
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wdt->max_timeout = 30;
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wdt->parent = dev;
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watchdog_set_nowayout(wdt, nowayout);
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platform_set_drvdata(pdev, wdt);
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twl4030_wdt_stop(wdt);
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return devm_watchdog_register_device(dev, wdt);
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}
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#ifdef CONFIG_PM
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static int twl4030_wdt_suspend(struct platform_device *pdev, pm_message_t state)
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{
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struct watchdog_device *wdt = platform_get_drvdata(pdev);
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if (watchdog_active(wdt))
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return twl4030_wdt_stop(wdt);
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return 0;
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}
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static int twl4030_wdt_resume(struct platform_device *pdev)
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{
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struct watchdog_device *wdt = platform_get_drvdata(pdev);
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if (watchdog_active(wdt))
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return twl4030_wdt_start(wdt);
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return 0;
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}
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#else
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#define twl4030_wdt_suspend NULL
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#define twl4030_wdt_resume NULL
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#endif
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static const struct of_device_id twl_wdt_of_match[] = {
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{ .compatible = "ti,twl4030-wdt", },
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{ },
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};
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MODULE_DEVICE_TABLE(of, twl_wdt_of_match);
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static struct platform_driver twl4030_wdt_driver = {
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.probe = twl4030_wdt_probe,
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.suspend = twl4030_wdt_suspend,
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.resume = twl4030_wdt_resume,
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.driver = {
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.name = "twl4030_wdt",
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.of_match_table = twl_wdt_of_match,
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},
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};
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module_platform_driver(twl4030_wdt_driver);
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MODULE_AUTHOR("Nokia Corporation");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:twl4030_wdt");
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