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Release 4.10 drivers/watchdog/wm8350_wdt.c

Directory: drivers/watchdog
/*
 * Watchdog driver for the wm8350
 *
 * Copyright (C) 2007, 2008 Wolfson Microelectronics <linux@wolfsonmicro.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
 */


#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/watchdog.h>
#include <linux/uaccess.h>
#include <linux/mfd/wm8350/core.h>


static bool nowayout = WATCHDOG_NOWAYOUT;
module_param(nowayout, bool, 0);
MODULE_PARM_DESC(nowayout,
		 "Watchdog cannot be stopped once started (default="
		 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");

static DEFINE_MUTEX(wdt_mutex);

static struct {
	
unsigned int time;  /* Seconds */
	
u16 val;	    /* To be set in WM8350_SYSTEM_CONTROL_2 */
} 
wm8350_wdt_cfgs[] = {
	{ 1, 0x02 },
	{ 2, 0x04 },
	{ 4, 0x05 },
};


static int wm8350_wdt_set_timeout(struct watchdog_device *wdt_dev, unsigned int timeout) { struct wm8350 *wm8350 = watchdog_get_drvdata(wdt_dev); int ret, i; u16 reg; for (i = 0; i < ARRAY_SIZE(wm8350_wdt_cfgs); i++) if (wm8350_wdt_cfgs[i].time == timeout) break; if (i == ARRAY_SIZE(wm8350_wdt_cfgs)) return -EINVAL; mutex_lock(&wdt_mutex); wm8350_reg_unlock(wm8350); reg = wm8350_reg_read(wm8350, WM8350_SYSTEM_CONTROL_2); reg &= ~WM8350_WDOG_TO_MASK; reg |= wm8350_wdt_cfgs[i].val; ret = wm8350_reg_write(wm8350, WM8350_SYSTEM_CONTROL_2, reg); wm8350_reg_lock(wm8350); mutex_unlock(&wdt_mutex); wdt_dev->timeout = timeout; return ret; }

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wim van sebroeckwim van sebroeck64.32%133.33%
Total139100.00%3100.00%


static int wm8350_wdt_start(struct watchdog_device *wdt_dev) { struct wm8350 *wm8350 = watchdog_get_drvdata(wdt_dev); int ret; u16 reg; mutex_lock(&wdt_mutex); wm8350_reg_unlock(wm8350); reg = wm8350_reg_read(wm8350, WM8350_SYSTEM_CONTROL_2); reg &= ~WM8350_WDOG_MODE_MASK; reg |= 0x20; ret = wm8350_reg_write(wm8350, WM8350_SYSTEM_CONTROL_2, reg); wm8350_reg_lock(wm8350); mutex_unlock(&wdt_mutex); return ret; }

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static int wm8350_wdt_stop(struct watchdog_device *wdt_dev) { struct wm8350 *wm8350 = watchdog_get_drvdata(wdt_dev); int ret; u16 reg; mutex_lock(&wdt_mutex); wm8350_reg_unlock(wm8350); reg = wm8350_reg_read(wm8350, WM8350_SYSTEM_CONTROL_2); reg &= ~WM8350_WDOG_MODE_MASK; ret = wm8350_reg_write(wm8350, WM8350_SYSTEM_CONTROL_2, reg); wm8350_reg_lock(wm8350); mutex_unlock(&wdt_mutex); return ret; }

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static int wm8350_wdt_ping(struct watchdog_device *wdt_dev) { struct wm8350 *wm8350 = watchdog_get_drvdata(wdt_dev); int ret; u16 reg; mutex_lock(&wdt_mutex); reg = wm8350_reg_read(wm8350, WM8350_SYSTEM_CONTROL_2); ret = wm8350_reg_write(wm8350, WM8350_SYSTEM_CONTROL_2, reg); mutex_unlock(&wdt_mutex); return ret; }

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static const struct watchdog_info wm8350_wdt_info = { .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE, .identity = "WM8350 Watchdog", }; static const struct watchdog_ops wm8350_wdt_ops = { .owner = THIS_MODULE, .start = wm8350_wdt_start, .stop = wm8350_wdt_stop, .ping = wm8350_wdt_ping, .set_timeout = wm8350_wdt_set_timeout, }; static struct watchdog_device wm8350_wdt = { .info = &wm8350_wdt_info, .ops = &wm8350_wdt_ops, .timeout = 4, .min_timeout = 1, .max_timeout = 4, };
static int wm8350_wdt_probe(struct platform_device *pdev) { struct wm8350 *wm8350 = platform_get_drvdata(pdev); if (!wm8350) { pr_err("No driver data supplied\n"); return -ENODEV; } watchdog_set_nowayout(&wm8350_wdt, nowayout); watchdog_set_drvdata(&wm8350_wdt, wm8350); wm8350_wdt.parent = &pdev->dev; /* Default to 4s timeout */ wm8350_wdt_set_timeout(&wm8350_wdt, 4); return watchdog_register_device(&wm8350_wdt); }

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static int wm8350_wdt_remove(struct platform_device *pdev) { watchdog_unregister_device(&wm8350_wdt); return 0; }

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static struct platform_driver wm8350_wdt_driver = { .probe = wm8350_wdt_probe, .remove = wm8350_wdt_remove, .driver = { .name = "wm8350-wdt", }, }; module_platform_driver(wm8350_wdt_driver); MODULE_AUTHOR("Mark Brown"); MODULE_DESCRIPTION("WM8350 Watchdog"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:wm8350-wdt");

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pratyush anandpratyush anand91.29%114.29%
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joe perchesjoe perches71.00%114.29%
Total699100.00%7100.00%
Directory: drivers/watchdog
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