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Release 4.10 drivers/watchdog/da9063_wdt.c

Directory: drivers/watchdog
/*
 * Watchdog driver for DA9063 PMICs.
 *
 * Copyright(c) 2012 Dialog Semiconductor Ltd.
 *
 * Author: Mariusz Wojtasik <mariusz.wojtasik@diasemi.com>
 *
 * This program is free software; you can redistribute  it and/or modify it
 * under  the terms of  the GNU General  Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/watchdog.h>
#include <linux/platform_device.h>
#include <linux/uaccess.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/mfd/da9063/registers.h>
#include <linux/mfd/da9063/core.h>
#include <linux/regmap.h>

/*
 * Watchdog selector to timeout in seconds.
 *   0: WDT disabled;
 *   others: timeout = 2048 ms * 2^(TWDSCALE-1).
 */

static const unsigned int wdt_timeout[] = { 0, 2, 4, 8, 16, 32, 65, 131 };

#define DA9063_TWDSCALE_DISABLE		0

#define DA9063_TWDSCALE_MIN		1

#define DA9063_TWDSCALE_MAX		(ARRAY_SIZE(wdt_timeout) - 1)

#define DA9063_WDT_MIN_TIMEOUT		wdt_timeout[DA9063_TWDSCALE_MIN]

#define DA9063_WDT_MAX_TIMEOUT		wdt_timeout[DA9063_TWDSCALE_MAX]

#define DA9063_WDG_TIMEOUT		wdt_timeout[3]

#define DA9063_RESET_PROTECTION_MS	256


struct da9063_watchdog {
	
struct da9063 *da9063;
	
struct watchdog_device wdtdev;
};


static unsigned int da9063_wdt_timeout_to_sel(unsigned int secs) { unsigned int i; for (i = DA9063_TWDSCALE_MIN; i <= DA9063_TWDSCALE_MAX; i++) { if (wdt_timeout[i] >= secs) return i; } return DA9063_TWDSCALE_MAX; }

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static int _da9063_wdt_set_timeout(struct da9063 *da9063, unsigned int regval) { return regmap_update_bits(da9063->regmap, DA9063_REG_CONTROL_D, DA9063_TWDSCALE_MASK, regval); }

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static int da9063_wdt_start(struct watchdog_device *wdd) { struct da9063_watchdog *wdt = watchdog_get_drvdata(wdd); unsigned int selector; int ret; selector = da9063_wdt_timeout_to_sel(wdt->wdtdev.timeout); ret = _da9063_wdt_set_timeout(wdt->da9063, selector); if (ret) dev_err(wdt->da9063->dev, "Watchdog failed to start (err = %d)\n", ret); return ret; }

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static int da9063_wdt_stop(struct watchdog_device *wdd) { struct da9063_watchdog *wdt = watchdog_get_drvdata(wdd); int ret; ret = regmap_update_bits(wdt->da9063->regmap, DA9063_REG_CONTROL_D, DA9063_TWDSCALE_MASK, DA9063_TWDSCALE_DISABLE); if (ret) dev_alert(wdt->da9063->dev, "Watchdog failed to stop (err = %d)\n", ret); return ret; }

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static int da9063_wdt_ping(struct watchdog_device *wdd) { struct da9063_watchdog *wdt = watchdog_get_drvdata(wdd); int ret; ret = regmap_write(wdt->da9063->regmap, DA9063_REG_CONTROL_F, DA9063_WATCHDOG); if (ret) dev_alert(wdt->da9063->dev, "Failed to ping the watchdog (err = %d)\n", ret); return ret; }

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static int da9063_wdt_set_timeout(struct watchdog_device *wdd, unsigned int timeout) { struct da9063_watchdog *wdt = watchdog_get_drvdata(wdd); unsigned int selector; int ret; selector = da9063_wdt_timeout_to_sel(timeout); ret = _da9063_wdt_set_timeout(wdt->da9063, selector); if (ret) dev_err(wdt->da9063->dev, "Failed to set watchdog timeout (err = %d)\n", ret); else wdd->timeout = wdt_timeout[selector]; return ret; }

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static int da9063_wdt_restart(struct watchdog_device *wdd, unsigned long action, void *data) { struct da9063_watchdog *wdt = watchdog_get_drvdata(wdd); int ret; ret = regmap_write(wdt->da9063->regmap, DA9063_REG_CONTROL_F, DA9063_SHUTDOWN); if (ret) dev_alert(wdt->da9063->dev, "Failed to shutdown (err = %d)\n", ret); return ret; }

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static const struct watchdog_info da9063_watchdog_info = { .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING, .identity = "DA9063 Watchdog", }; static const struct watchdog_ops da9063_watchdog_ops = { .owner = THIS_MODULE, .start = da9063_wdt_start, .stop = da9063_wdt_stop, .ping = da9063_wdt_ping, .set_timeout = da9063_wdt_set_timeout, .restart = da9063_wdt_restart, };
static int da9063_wdt_probe(struct platform_device *pdev) { int ret; struct da9063 *da9063; struct da9063_watchdog *wdt; if (!pdev->dev.parent) return -EINVAL; da9063 = dev_get_drvdata(pdev->dev.parent); if (!da9063) return -EINVAL; wdt = devm_kzalloc(&pdev->dev, sizeof(*wdt), GFP_KERNEL); if (!wdt) return -ENOMEM; wdt->da9063 = da9063; wdt->wdtdev.info = &da9063_watchdog_info; wdt->wdtdev.ops = &da9063_watchdog_ops; wdt->wdtdev.min_timeout = DA9063_WDT_MIN_TIMEOUT; wdt->wdtdev.max_timeout = DA9063_WDT_MAX_TIMEOUT; wdt->wdtdev.min_hw_heartbeat_ms = DA9063_RESET_PROTECTION_MS; wdt->wdtdev.timeout = DA9063_WDG_TIMEOUT; wdt->wdtdev.parent = &pdev->dev; wdt->wdtdev.status = WATCHDOG_NOWAYOUT_INIT_STATUS; watchdog_set_restart_priority(&wdt->wdtdev, 128); watchdog_set_drvdata(&wdt->wdtdev, wdt); dev_set_drvdata(&pdev->dev, wdt); ret = watchdog_register_device(&wdt->wdtdev); if (ret) return ret; return 0; }

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static int da9063_wdt_remove(struct platform_device *pdev) { struct da9063_watchdog *wdt = dev_get_drvdata(&pdev->dev); watchdog_unregister_device(&wdt->wdtdev); return 0; }

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static struct platform_driver da9063_wdt_driver = { .probe = da9063_wdt_probe, .remove = da9063_wdt_remove, .driver = { .name = DA9063_DRVNAME_WATCHDOG, }, }; module_platform_driver(da9063_wdt_driver); MODULE_AUTHOR("Mariusz Wojtasik <mariusz.wojtasik@diasemi.com>"); MODULE_DESCRIPTION("Watchdog driver for Dialog DA9063"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:" DA9063_DRVNAME_WATCHDOG);

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stefan christstefan christ121.39%116.67%
pratyush anandpratyush anand111.27%116.67%
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Directory: drivers/watchdog
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