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![Guenter Roeck](/assets/img/avatar_default.png)
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 - Replace 'val = e; return val;' with 'return e;' - Replace 'if (e) return e; return 0;' with 'return e;' - Drop assignments to otherwise unused variables - Drop unused variables - Drop remove function - Drop dev_set_drvdata() - Use devm_watchdog_register_driver() to register watchdog device Acked-by: Adam Thomson <Adam.Thomson.Opensource@diasemi.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
198 lines
5.1 KiB
C
198 lines
5.1 KiB
C
/*
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* Watchdog driver for DA9063 PMICs.
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*
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* Copyright(c) 2012 Dialog Semiconductor Ltd.
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*
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* Author: Mariusz Wojtasik <mariusz.wojtasik@diasemi.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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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/uaccess.h>
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#include <linux/slab.h>
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#include <linux/delay.h>
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#include <linux/mfd/da9063/registers.h>
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#include <linux/mfd/da9063/core.h>
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#include <linux/regmap.h>
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/*
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* Watchdog selector to timeout in seconds.
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* 0: WDT disabled;
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* others: timeout = 2048 ms * 2^(TWDSCALE-1).
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*/
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static const unsigned int wdt_timeout[] = { 0, 2, 4, 8, 16, 32, 65, 131 };
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#define DA9063_TWDSCALE_DISABLE 0
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#define DA9063_TWDSCALE_MIN 1
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#define DA9063_TWDSCALE_MAX (ARRAY_SIZE(wdt_timeout) - 1)
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#define DA9063_WDT_MIN_TIMEOUT wdt_timeout[DA9063_TWDSCALE_MIN]
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#define DA9063_WDT_MAX_TIMEOUT wdt_timeout[DA9063_TWDSCALE_MAX]
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#define DA9063_WDG_TIMEOUT wdt_timeout[3]
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#define DA9063_RESET_PROTECTION_MS 256
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struct da9063_watchdog {
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struct da9063 *da9063;
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struct watchdog_device wdtdev;
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};
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static unsigned int da9063_wdt_timeout_to_sel(unsigned int secs)
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{
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unsigned int i;
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for (i = DA9063_TWDSCALE_MIN; i <= DA9063_TWDSCALE_MAX; i++) {
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if (wdt_timeout[i] >= secs)
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return i;
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}
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return DA9063_TWDSCALE_MAX;
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}
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static int _da9063_wdt_set_timeout(struct da9063 *da9063, unsigned int regval)
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{
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return regmap_update_bits(da9063->regmap, DA9063_REG_CONTROL_D,
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DA9063_TWDSCALE_MASK, regval);
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}
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static int da9063_wdt_start(struct watchdog_device *wdd)
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{
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struct da9063_watchdog *wdt = watchdog_get_drvdata(wdd);
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unsigned int selector;
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int ret;
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selector = da9063_wdt_timeout_to_sel(wdt->wdtdev.timeout);
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ret = _da9063_wdt_set_timeout(wdt->da9063, selector);
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if (ret)
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dev_err(wdt->da9063->dev, "Watchdog failed to start (err = %d)\n",
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ret);
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return ret;
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}
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static int da9063_wdt_stop(struct watchdog_device *wdd)
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{
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struct da9063_watchdog *wdt = watchdog_get_drvdata(wdd);
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int ret;
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ret = regmap_update_bits(wdt->da9063->regmap, DA9063_REG_CONTROL_D,
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DA9063_TWDSCALE_MASK, DA9063_TWDSCALE_DISABLE);
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if (ret)
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dev_alert(wdt->da9063->dev, "Watchdog failed to stop (err = %d)\n",
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ret);
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return ret;
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}
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static int da9063_wdt_ping(struct watchdog_device *wdd)
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{
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struct da9063_watchdog *wdt = watchdog_get_drvdata(wdd);
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int ret;
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ret = regmap_write(wdt->da9063->regmap, DA9063_REG_CONTROL_F,
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DA9063_WATCHDOG);
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if (ret)
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dev_alert(wdt->da9063->dev, "Failed to ping the watchdog (err = %d)\n",
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ret);
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return ret;
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}
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static int da9063_wdt_set_timeout(struct watchdog_device *wdd,
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unsigned int timeout)
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{
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struct da9063_watchdog *wdt = watchdog_get_drvdata(wdd);
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unsigned int selector;
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int ret;
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selector = da9063_wdt_timeout_to_sel(timeout);
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ret = _da9063_wdt_set_timeout(wdt->da9063, selector);
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if (ret)
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dev_err(wdt->da9063->dev, "Failed to set watchdog timeout (err = %d)\n",
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ret);
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else
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wdd->timeout = wdt_timeout[selector];
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return ret;
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}
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static int da9063_wdt_restart(struct watchdog_device *wdd, unsigned long action,
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void *data)
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{
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struct da9063_watchdog *wdt = watchdog_get_drvdata(wdd);
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int ret;
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ret = regmap_write(wdt->da9063->regmap, DA9063_REG_CONTROL_F,
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DA9063_SHUTDOWN);
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if (ret)
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dev_alert(wdt->da9063->dev, "Failed to shutdown (err = %d)\n",
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ret);
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return ret;
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}
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static const struct watchdog_info da9063_watchdog_info = {
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.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
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.identity = "DA9063 Watchdog",
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};
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static const struct watchdog_ops da9063_watchdog_ops = {
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.owner = THIS_MODULE,
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.start = da9063_wdt_start,
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.stop = da9063_wdt_stop,
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.ping = da9063_wdt_ping,
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.set_timeout = da9063_wdt_set_timeout,
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.restart = da9063_wdt_restart,
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};
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static int da9063_wdt_probe(struct platform_device *pdev)
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{
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struct da9063 *da9063;
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struct da9063_watchdog *wdt;
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if (!pdev->dev.parent)
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return -EINVAL;
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da9063 = dev_get_drvdata(pdev->dev.parent);
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if (!da9063)
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return -EINVAL;
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wdt = devm_kzalloc(&pdev->dev, sizeof(*wdt), GFP_KERNEL);
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if (!wdt)
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return -ENOMEM;
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wdt->da9063 = da9063;
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wdt->wdtdev.info = &da9063_watchdog_info;
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wdt->wdtdev.ops = &da9063_watchdog_ops;
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wdt->wdtdev.min_timeout = DA9063_WDT_MIN_TIMEOUT;
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wdt->wdtdev.max_timeout = DA9063_WDT_MAX_TIMEOUT;
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wdt->wdtdev.min_hw_heartbeat_ms = DA9063_RESET_PROTECTION_MS;
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wdt->wdtdev.timeout = DA9063_WDG_TIMEOUT;
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wdt->wdtdev.parent = &pdev->dev;
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wdt->wdtdev.status = WATCHDOG_NOWAYOUT_INIT_STATUS;
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watchdog_set_restart_priority(&wdt->wdtdev, 128);
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watchdog_set_drvdata(&wdt->wdtdev, wdt);
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return devm_watchdog_register_device(&pdev->dev, &wdt->wdtdev);
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}
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static struct platform_driver da9063_wdt_driver = {
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.probe = da9063_wdt_probe,
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.driver = {
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.name = DA9063_DRVNAME_WATCHDOG,
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},
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};
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module_platform_driver(da9063_wdt_driver);
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MODULE_AUTHOR("Mariusz Wojtasik <mariusz.wojtasik@diasemi.com>");
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MODULE_DESCRIPTION("Watchdog driver for Dialog DA9063");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:" DA9063_DRVNAME_WATCHDOG);
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