[mirror_ubuntu-hirsute-kernel.git] / drivers / watchdog / twl4030_wdt.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright (C) Nokia Corporation
 *
 * Written by Timo Kokkonen <timo.t.kokkonen at nokia.com>
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/kernel.h>
#include <linux/watchdog.h>
#include <linux/platform_device.h>
#include <linux/mfd/twl.h>

#define TWL4030_WATCHDOG_CFG_REG_OFFS	0x3

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 int twl4030_wdt_write(unsigned char val)
{
	return twl_i2c_write_u8(TWL_MODULE_PM_RECEIVER, val,
					TWL4030_WATCHDOG_CFG_REG_OFFS);
}

static int twl4030_wdt_start(struct watchdog_device *wdt)
{
	return twl4030_wdt_write(wdt->timeout + 1);
}

static int twl4030_wdt_stop(struct watchdog_device *wdt)
{
	return twl4030_wdt_write(0);
}

static int twl4030_wdt_set_timeout(struct watchdog_device *wdt,
				   unsigned int timeout)
{
	wdt->timeout = timeout;
	return 0;
}

static const struct watchdog_info twl4030_wdt_info = {
	.options = WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING,
	.identity = "TWL4030 Watchdog",
};

static const struct watchdog_ops twl4030_wdt_ops = {
	.owner		= THIS_MODULE,
	.start		= twl4030_wdt_start,
	.stop		= twl4030_wdt_stop,
	.set_timeout	= twl4030_wdt_set_timeout,
};

static int twl4030_wdt_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct watchdog_device *wdt;

	wdt = devm_kzalloc(dev, sizeof(*wdt), GFP_KERNEL);
	if (!wdt)
		return -ENOMEM;

	wdt->info		= &twl4030_wdt_info;
	wdt->ops		= &twl4030_wdt_ops;
	wdt->status		= 0;
	wdt->timeout		= 30;
	wdt->min_timeout	= 1;
	wdt->max_timeout	= 30;
	wdt->parent = dev;

	watchdog_set_nowayout(wdt, nowayout);
	platform_set_drvdata(pdev, wdt);

	twl4030_wdt_stop(wdt);

	return devm_watchdog_register_device(dev, wdt);
}

#ifdef CONFIG_PM
static int twl4030_wdt_suspend(struct platform_device *pdev, pm_message_t state)
{
	struct watchdog_device *wdt = platform_get_drvdata(pdev);
	if (watchdog_active(wdt))
		return twl4030_wdt_stop(wdt);

	return 0;
}

static int twl4030_wdt_resume(struct platform_device *pdev)
{
	struct watchdog_device *wdt = platform_get_drvdata(pdev);
	if (watchdog_active(wdt))
		return twl4030_wdt_start(wdt);

	return 0;
}
#else
#define twl4030_wdt_suspend        NULL
#define twl4030_wdt_resume         NULL
#endif

static const struct of_device_id twl_wdt_of_match[] = {
	{ .compatible = "ti,twl4030-wdt", },
	{ },
};
MODULE_DEVICE_TABLE(of, twl_wdt_of_match);

static struct platform_driver twl4030_wdt_driver = {
	.probe		= twl4030_wdt_probe,
	.suspend	= twl4030_wdt_suspend,
	.resume		= twl4030_wdt_resume,
	.driver		= {
		.name		= "twl4030_wdt",
		.of_match_table	= twl_wdt_of_match,
	},
};

module_platform_driver(twl4030_wdt_driver);

MODULE_AUTHOR("Nokia Corporation");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:twl4030_wdt");
Commit	Line	Data
1a59d1b8	1	// SPDX-License-Identifier: GPL-2.0-or-later
80e45b1e TK	2	/*
	3	* Copyright (C) Nokia Corporation
	4	*
	5	* Written by Timo Kokkonen <timo.t.kokkonen at nokia.com>
80e45b1e TK	6	*/
	7
	8	#include <linux/module.h>
	9	#include <linux/types.h>
5a0e3ad6	10	#include <linux/slab.h>
80e45b1e	11	#include <linux/kernel.h>
80e45b1e TK	12	#include <linux/watchdog.h>
80e45b1e TK	13	#include <linux/platform_device.h>
a2054256	14	#include <linux/mfd/twl.h>
80e45b1e TK	15
	16	#define TWL4030_WATCHDOG_CFG_REG_OFFS 0x3
	17
86a1e189 WVS	18	static bool nowayout = WATCHDOG_NOWAYOUT;
86a1e189 WVS	19	module_param(nowayout, bool, 0);
80e45b1e TK	20	MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started "
	21	"(default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
	22
	23	static int twl4030_wdt_write(unsigned char val)
	24	{
2bc3f62f	25	return twl_i2c_write_u8(TWL_MODULE_PM_RECEIVER, val,
80e45b1e TK	26	TWL4030_WATCHDOG_CFG_REG_OFFS);
	27	}
	28
b2c4e4b2	29	static int twl4030_wdt_start(struct watchdog_device *wdt)
80e45b1e	30	{
b2c4e4b2	31	return twl4030_wdt_write(wdt->timeout + 1);
80e45b1e TK	32	}
80e45b1e TK	33
b2c4e4b2	34	static int twl4030_wdt_stop(struct watchdog_device *wdt)
80e45b1e TK	35	{
	36	return twl4030_wdt_write(0);
	37	}
	38
b2c4e4b2 JN	39	static int twl4030_wdt_set_timeout(struct watchdog_device *wdt,
b2c4e4b2 JN	40	unsigned int timeout)
80e45b1e	41	{
b2c4e4b2	42	wdt->timeout = timeout;
80e45b1e TK	43	return 0;
	44	}
	45
b2c4e4b2	46	static const struct watchdog_info twl4030_wdt_info = {
fb1cbeae	47	.options = WDIOF_SETTIMEOUT \| WDIOF_MAGICCLOSE \| WDIOF_KEEPALIVEPING,
b2c4e4b2 JN	48	.identity = "TWL4030 Watchdog",
b2c4e4b2 JN	49	};
80e45b1e	50
b2c4e4b2	51	static const struct watchdog_ops twl4030_wdt_ops = {
80e45b1e	52	.owner = THIS_MODULE,
b2c4e4b2 JN	53	.start = twl4030_wdt_start,
	54	.stop = twl4030_wdt_stop,
	55	.set_timeout = twl4030_wdt_set_timeout,
80e45b1e TK	56	};
80e45b1e TK	57
2d991a16	58	static int twl4030_wdt_probe(struct platform_device *pdev)
80e45b1e	59	{
b42488bc	60	struct device *dev = &pdev->dev;
b2c4e4b2	61	struct watchdog_device *wdt;
80e45b1e	62
b42488bc	63	wdt = devm_kzalloc(dev, sizeof(*wdt), GFP_KERNEL);
80e45b1e TK	64	if (!wdt)
	65	return -ENOMEM;
	66
b2c4e4b2 JN	67	wdt->info = &twl4030_wdt_info;
	68	wdt->ops = &twl4030_wdt_ops;
	69	wdt->status = 0;
	70	wdt->timeout = 30;
	71	wdt->min_timeout = 1;
	72	wdt->max_timeout = 30;
b42488bc	73	wdt->parent = dev;
80e45b1e	74
b2c4e4b2	75	watchdog_set_nowayout(wdt, nowayout);
80e45b1e TK	76	platform_set_drvdata(pdev, wdt);
80e45b1e TK	77
b2c4e4b2	78	twl4030_wdt_stop(wdt);
80e45b1e	79
b42488bc	80	return devm_watchdog_register_device(dev, wdt);
80e45b1e TK	81	}
	82
	83	#ifdef CONFIG_PM
	84	static int twl4030_wdt_suspend(struct platform_device *pdev, pm_message_t state)
	85	{
b2c4e4b2 JN	86	struct watchdog_device *wdt = platform_get_drvdata(pdev);
	87	if (watchdog_active(wdt))
	88	return twl4030_wdt_stop(wdt);
80e45b1e TK	89
	90	return 0;
	91	}
	92
	93	static int twl4030_wdt_resume(struct platform_device *pdev)
	94	{
b2c4e4b2 JN	95	struct watchdog_device *wdt = platform_get_drvdata(pdev);
	96	if (watchdog_active(wdt))
	97	return twl4030_wdt_start(wdt);
80e45b1e TK	98
	99	return 0;
	100	}
	101	#else
	102	#define twl4030_wdt_suspend NULL
	103	#define twl4030_wdt_resume NULL
	104	#endif
	105
8899b8d9 AK	106	static const struct of_device_id twl_wdt_of_match[] = {
	107	{ .compatible = "ti,twl4030-wdt", },
	108	{ },
	109	};
	110	MODULE_DEVICE_TABLE(of, twl_wdt_of_match);
	111
80e45b1e TK	112	static struct platform_driver twl4030_wdt_driver = {
80e45b1e TK	113	.probe = twl4030_wdt_probe,
80e45b1e TK	114	.suspend = twl4030_wdt_suspend,
	115	.resume = twl4030_wdt_resume,
	116	.driver = {
8899b8d9 AK	117	.name = "twl4030_wdt",
8899b8d9 AK	118	.of_match_table = twl_wdt_of_match,
80e45b1e TK	119	},
	120	};
	121
b8ec6118	122	module_platform_driver(twl4030_wdt_driver);
80e45b1e TK	123
	124	MODULE_AUTHOR("Nokia Corporation");
	125	MODULE_LICENSE("GPL");
80e45b1e TK	126	MODULE_ALIAS("platform:twl4030_wdt");
80e45b1e TK	127