89e5b7aca1
Use device managed functions to simplify error handling, reduce source code size, improve readability, and reduce the likelyhood of bugs. Other improvements as listed below. 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 - Drop empty remove function - Introduce local variable 'struct device *dev' and use it instead of dereferencing it repeatedly - Use devm_watchdog_register_driver() to register watchdog device Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
163 lines
3.9 KiB
C
163 lines
3.9 KiB
C
/*
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* Copyright (C) ST-Ericsson SA 2011-2013
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*
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* License Terms: GNU General Public License v2
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*
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* Author: Mathieu Poirier <mathieu.poirier@linaro.org> for ST-Ericsson
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* Author: Jonas Aaberg <jonas.aberg@stericsson.com> for ST-Ericsson
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/moduleparam.h>
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#include <linux/err.h>
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#include <linux/uaccess.h>
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#include <linux/watchdog.h>
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#include <linux/platform_device.h>
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#include <linux/platform_data/ux500_wdt.h>
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#include <linux/mfd/dbx500-prcmu.h>
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#define WATCHDOG_TIMEOUT 600 /* 10 minutes */
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#define WATCHDOG_MIN 0
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#define WATCHDOG_MAX28 268435 /* 28 bit resolution in ms == 268435.455 s */
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#define WATCHDOG_MAX32 4294967 /* 32 bit resolution in ms == 4294967.295 s */
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static unsigned int timeout = WATCHDOG_TIMEOUT;
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module_param(timeout, uint, 0);
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MODULE_PARM_DESC(timeout,
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"Watchdog timeout in seconds. default="
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__MODULE_STRING(WATCHDOG_TIMEOUT) ".");
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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,
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"Watchdog cannot be stopped once started (default="
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__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
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static int ux500_wdt_start(struct watchdog_device *wdd)
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{
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return prcmu_enable_a9wdog(PRCMU_WDOG_ALL);
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}
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static int ux500_wdt_stop(struct watchdog_device *wdd)
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{
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return prcmu_disable_a9wdog(PRCMU_WDOG_ALL);
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}
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static int ux500_wdt_keepalive(struct watchdog_device *wdd)
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{
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return prcmu_kick_a9wdog(PRCMU_WDOG_ALL);
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}
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static int ux500_wdt_set_timeout(struct watchdog_device *wdd,
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unsigned int timeout)
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{
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ux500_wdt_stop(wdd);
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prcmu_load_a9wdog(PRCMU_WDOG_ALL, timeout * 1000);
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ux500_wdt_start(wdd);
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return 0;
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}
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static const struct watchdog_info ux500_wdt_info = {
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.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
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.identity = "Ux500 WDT",
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.firmware_version = 1,
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};
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static const struct watchdog_ops ux500_wdt_ops = {
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.owner = THIS_MODULE,
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.start = ux500_wdt_start,
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.stop = ux500_wdt_stop,
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.ping = ux500_wdt_keepalive,
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.set_timeout = ux500_wdt_set_timeout,
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};
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static struct watchdog_device ux500_wdt = {
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.info = &ux500_wdt_info,
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.ops = &ux500_wdt_ops,
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.min_timeout = WATCHDOG_MIN,
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.max_timeout = WATCHDOG_MAX32,
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};
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static int ux500_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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struct ux500_wdt_data *pdata = dev_get_platdata(dev);
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if (pdata) {
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if (pdata->timeout > 0)
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timeout = pdata->timeout;
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if (pdata->has_28_bits_resolution)
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ux500_wdt.max_timeout = WATCHDOG_MAX28;
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}
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ux500_wdt.parent = dev;
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watchdog_set_nowayout(&ux500_wdt, nowayout);
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/* disable auto off on sleep */
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prcmu_config_a9wdog(PRCMU_WDOG_CPU1, false);
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/* set HW initial value */
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prcmu_load_a9wdog(PRCMU_WDOG_ALL, timeout * 1000);
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ret = devm_watchdog_register_device(dev, &ux500_wdt);
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if (ret)
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return ret;
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dev_info(dev, "initialized\n");
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return 0;
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}
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#ifdef CONFIG_PM
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static int ux500_wdt_suspend(struct platform_device *pdev,
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pm_message_t state)
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{
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if (watchdog_active(&ux500_wdt)) {
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ux500_wdt_stop(&ux500_wdt);
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prcmu_config_a9wdog(PRCMU_WDOG_CPU1, true);
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prcmu_load_a9wdog(PRCMU_WDOG_ALL, timeout * 1000);
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ux500_wdt_start(&ux500_wdt);
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}
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return 0;
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}
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static int ux500_wdt_resume(struct platform_device *pdev)
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{
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if (watchdog_active(&ux500_wdt)) {
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ux500_wdt_stop(&ux500_wdt);
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prcmu_config_a9wdog(PRCMU_WDOG_CPU1, false);
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prcmu_load_a9wdog(PRCMU_WDOG_ALL, timeout * 1000);
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ux500_wdt_start(&ux500_wdt);
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}
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return 0;
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}
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#else
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#define ux500_wdt_suspend NULL
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#define ux500_wdt_resume NULL
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#endif
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static struct platform_driver ux500_wdt_driver = {
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.probe = ux500_wdt_probe,
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.suspend = ux500_wdt_suspend,
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.resume = ux500_wdt_resume,
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.driver = {
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.name = "ux500_wdt",
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},
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};
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module_platform_driver(ux500_wdt_driver);
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MODULE_AUTHOR("Jonas Aaberg <jonas.aberg@stericsson.com>");
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MODULE_DESCRIPTION("Ux500 Watchdog Driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:ux500_wdt");
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