[linux.git] / drivers / watchdog / ts72xx_wdt.c

/*
 * Watchdog driver for Technologic Systems TS-72xx based SBCs
 * (TS-7200, TS-7250 and TS-7260). These boards have external
 * glue logic CPLD chip, which includes programmable watchdog
 * timer.
 *
 * Copyright (c) 2009 Mika Westerberg <[email protected]>
 *
 * This driver is based on ep93xx_wdt and wm831x_wdt drivers.
 *
 * This file is licensed under the terms of the GNU General Public
 * License version 2. This program is licensed "as is" without any
 * warranty of any kind, whether express or implied.
 */

#include <linux/fs.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/miscdevice.h>
#include <linux/mutex.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/watchdog.h>
#include <linux/uaccess.h>

#define TS72XX_WDT_FEED_VAL		0x05
#define TS72XX_WDT_DEFAULT_TIMEOUT	8

static int timeout = TS72XX_WDT_DEFAULT_TIMEOUT;
module_param(timeout, int, 0);
MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds. "
			  "(1 <= timeout <= 8, default="
			  __MODULE_STRING(TS72XX_WDT_DEFAULT_TIMEOUT)
			  ")");

static bool nowayout = WATCHDOG_NOWAYOUT;
module_param(nowayout, bool, 0);
MODULE_PARM_DESC(nowayout, "Disable watchdog shutdown on close");

/**
 * struct ts72xx_wdt - watchdog control structure
 * @lock: lock that protects this structure
 * @regval: watchdog timeout value suitable for control register
 * @flags: flags controlling watchdog device state
 * @control_reg: watchdog control register
 * @feed_reg: watchdog feed register
 * @pdev: back pointer to platform dev
 */
struct ts72xx_wdt {
	struct mutex	lock;
	int		regval;

#define TS72XX_WDT_BUSY_FLAG		1
#define TS72XX_WDT_EXPECT_CLOSE_FLAG	2
	int		flags;

	void __iomem	*control_reg;
	void __iomem	*feed_reg;

	struct platform_device *pdev;
};

static struct platform_device *ts72xx_wdt_pdev;

/*
 * TS-72xx Watchdog supports following timeouts (value written
 * to control register):
 *	value	description
 *	-------------------------
 *	0x00	watchdog disabled
 *	0x01	250ms
 *	0x02	500ms
 *	0x03	1s
 *	0x04	reserved
 *	0x05	2s
 *	0x06	4s
 *	0x07	8s
 *
 * Timeouts below 1s are not very usable so we don't
 * allow them at all.
 *
 * We provide two functions that convert between these:
 * timeout_to_regval() and regval_to_timeout().
 */
static const struct {
	int	timeout;
	int	regval;
} ts72xx_wdt_map[] = {
	{ 1, 3 },
	{ 2, 5 },
	{ 4, 6 },
	{ 8, 7 },
};

/**
 * timeout_to_regval() - converts given timeout to control register value
 * @new_timeout: timeout in seconds to be converted
 *
 * Function converts given @new_timeout into valid value that can
 * be programmed into watchdog control register. When conversion is
 * not possible, function returns %-EINVAL.
 */
static int timeout_to_regval(int new_timeout)
{
	int i;

	/* first limit it to 1 - 8 seconds */
	new_timeout = clamp_val(new_timeout, 1, 8);

	for (i = 0; i < ARRAY_SIZE(ts72xx_wdt_map); i++) {
		if (ts72xx_wdt_map[i].timeout >= new_timeout)
			return ts72xx_wdt_map[i].regval;
	}

	return -EINVAL;
}

/**
 * regval_to_timeout() - converts control register value to timeout
 * @regval: control register value to be converted
 *
 * Function converts given @regval to timeout in seconds (1, 2, 4 or 8).
 * If @regval cannot be converted, function returns %-EINVAL.
 */
static int regval_to_timeout(int regval)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(ts72xx_wdt_map); i++) {
		if (ts72xx_wdt_map[i].regval == regval)
			return ts72xx_wdt_map[i].timeout;
	}

	return -EINVAL;
}

/**
 * ts72xx_wdt_kick() - kick the watchdog
 * @wdt: watchdog to be kicked
 *
 * Called with @wdt->lock held.
 */
static inline void ts72xx_wdt_kick(struct ts72xx_wdt *wdt)
{
	__raw_writeb(TS72XX_WDT_FEED_VAL, wdt->feed_reg);
}

/**
 * ts72xx_wdt_start() - starts the watchdog timer
 * @wdt: watchdog to be started
 *
 * This function programs timeout to watchdog timer
 * and starts it.
 *
 * Called with @wdt->lock held.
 */
static void ts72xx_wdt_start(struct ts72xx_wdt *wdt)
{
	/*
	 * To program the wdt, it first must be "fed" and
	 * only after that (within 30 usecs) the configuration
	 * can be changed.
	 */
	ts72xx_wdt_kick(wdt);
	__raw_writeb((u8)wdt->regval, wdt->control_reg);
}

/**
 * ts72xx_wdt_stop() - stops the watchdog timer
 * @wdt: watchdog to be stopped
 *
 * Called with @wdt->lock held.
 */
static void ts72xx_wdt_stop(struct ts72xx_wdt *wdt)
{
	ts72xx_wdt_kick(wdt);
	__raw_writeb(0, wdt->control_reg);
}

static int ts72xx_wdt_open(struct inode *inode, struct file *file)
{
	struct ts72xx_wdt *wdt = platform_get_drvdata(ts72xx_wdt_pdev);
	int regval;

	/*
	 * Try to convert default timeout to valid register
	 * value first.
	 */
	regval = timeout_to_regval(timeout);
	if (regval < 0) {
		dev_err(&wdt->pdev->dev,
			"failed to convert timeout (%d) to register value\n",
			timeout);
		return regval;
	}

	if (mutex_lock_interruptible(&wdt->lock))
		return -ERESTARTSYS;

	if ((wdt->flags & TS72XX_WDT_BUSY_FLAG) != 0) {
		mutex_unlock(&wdt->lock);
		return -EBUSY;
	}

	wdt->flags = TS72XX_WDT_BUSY_FLAG;
	wdt->regval = regval;
	file->private_data = wdt;

	ts72xx_wdt_start(wdt);

	mutex_unlock(&wdt->lock);
	return nonseekable_open(inode, file);
}

static int ts72xx_wdt_release(struct inode *inode, struct file *file)
{
	struct ts72xx_wdt *wdt = file->private_data;

	if (mutex_lock_interruptible(&wdt->lock))
		return -ERESTARTSYS;

	if ((wdt->flags & TS72XX_WDT_EXPECT_CLOSE_FLAG) != 0) {
		ts72xx_wdt_stop(wdt);
	} else {
		dev_warn(&wdt->pdev->dev,
			 "TS-72XX WDT device closed unexpectly. "
			 "Watchdog timer will not stop!\n");
		/*
		 * Kick it one more time, to give userland some time
		 * to recover (for example, respawning the kicker
		 * daemon).
		 */
		ts72xx_wdt_kick(wdt);
	}

	wdt->flags = 0;

	mutex_unlock(&wdt->lock);
	return 0;
}

static ssize_t ts72xx_wdt_write(struct file *file,
				const char __user *data,
				size_t len,
				loff_t *ppos)
{
	struct ts72xx_wdt *wdt = file->private_data;

	if (!len)
		return 0;

	if (mutex_lock_interruptible(&wdt->lock))
		return -ERESTARTSYS;

	ts72xx_wdt_kick(wdt);

	/*
	 * Support for magic character closing. User process
	 * writes 'V' into the device, just before it is closed.
	 * This means that we know that the wdt timer can be
	 * stopped after user closes the device.
	 */
	if (!nowayout) {
		int i;

		for (i = 0; i < len; i++) {
			char c;

			/* In case it was set long ago */
			wdt->flags &= ~TS72XX_WDT_EXPECT_CLOSE_FLAG;

			if (get_user(c, data + i)) {
				mutex_unlock(&wdt->lock);
				return -EFAULT;
			}
			if (c == 'V') {
				wdt->flags |= TS72XX_WDT_EXPECT_CLOSE_FLAG;
				break;
			}
		}
	}

	mutex_unlock(&wdt->lock);
	return len;
}

static const struct watchdog_info winfo = {
	.options		= WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT |
				  WDIOF_MAGICCLOSE,
	.firmware_version	= 1,
	.identity		= "TS-72XX WDT",
};

static long ts72xx_wdt_ioctl(struct file *file, unsigned int cmd,
			     unsigned long arg)
{
	struct ts72xx_wdt *wdt = file->private_data;
	void __user *argp = (void __user *)arg;
	int __user *p = (int __user *)argp;
	int error = 0;

	if (mutex_lock_interruptible(&wdt->lock))
		return -ERESTARTSYS;

	switch (cmd) {
	case WDIOC_GETSUPPORT:
		if (copy_to_user(argp, &winfo, sizeof(winfo)))
			error = -EFAULT;
		break;

	case WDIOC_GETSTATUS:
	case WDIOC_GETBOOTSTATUS:
		error = put_user(0, p);
		break;

	case WDIOC_KEEPALIVE:
		ts72xx_wdt_kick(wdt);
		break;

	case WDIOC_SETOPTIONS: {
		int options;

		error = get_user(options, p);
		if (error)
			break;

		error = -EINVAL;

		if ((options & WDIOS_DISABLECARD) != 0) {
			ts72xx_wdt_stop(wdt);
			error = 0;
		}
		if ((options & WDIOS_ENABLECARD) != 0) {
			ts72xx_wdt_start(wdt);
			error = 0;
		}

		break;
	}

	case WDIOC_SETTIMEOUT: {
		int new_timeout;
		int regval;

		error = get_user(new_timeout, p);
		if (error)
			break;

		regval = timeout_to_regval(new_timeout);
		if (regval < 0) {
			error = regval;
			break;
		}
		ts72xx_wdt_stop(wdt);
		wdt->regval = regval;
		ts72xx_wdt_start(wdt);

		/*FALLTHROUGH*/
	}

	case WDIOC_GETTIMEOUT:
		error = put_user(regval_to_timeout(wdt->regval), p);
		break;

	default:
		error = -ENOTTY;
		break;
	}

	mutex_unlock(&wdt->lock);
	return error;
}

static const struct file_operations ts72xx_wdt_fops = {
	.owner		= THIS_MODULE,
	.llseek		= no_llseek,
	.open		= ts72xx_wdt_open,
	.release	= ts72xx_wdt_release,
	.write		= ts72xx_wdt_write,
	.unlocked_ioctl	= ts72xx_wdt_ioctl,
};

static struct miscdevice ts72xx_wdt_miscdev = {
	.minor		= WATCHDOG_MINOR,
	.name		= "watchdog",
	.fops		= &ts72xx_wdt_fops,
};

static int ts72xx_wdt_probe(struct platform_device *pdev)
{
	struct ts72xx_wdt *wdt;
	struct resource *r1, *r2;
	int error = 0;

	wdt = devm_kzalloc(&pdev->dev, sizeof(struct ts72xx_wdt), GFP_KERNEL);
	if (!wdt)
		return -ENOMEM;

	r1 = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	wdt->control_reg = devm_ioremap_resource(&pdev->dev, r1);
	if (IS_ERR(wdt->control_reg))
		return PTR_ERR(wdt->control_reg);

	r2 = platform_get_resource(pdev, IORESOURCE_MEM, 1);
	wdt->feed_reg = devm_ioremap_resource(&pdev->dev, r2);
	if (IS_ERR(wdt->feed_reg))
		return PTR_ERR(wdt->feed_reg);

	platform_set_drvdata(pdev, wdt);
	ts72xx_wdt_pdev = pdev;
	wdt->pdev = pdev;
	mutex_init(&wdt->lock);

	/* make sure that the watchdog is disabled */
	ts72xx_wdt_stop(wdt);

	error = misc_register(&ts72xx_wdt_miscdev);
	if (error) {
		dev_err(&pdev->dev, "failed to register miscdev\n");
		return error;
	}

	dev_info(&pdev->dev, "TS-72xx Watchdog driver\n");

	return 0;
}

static int ts72xx_wdt_remove(struct platform_device *pdev)
{
	int error;

	error = misc_deregister(&ts72xx_wdt_miscdev);

	return error;
}

static struct platform_driver ts72xx_wdt_driver = {
	.probe		= ts72xx_wdt_probe,
	.remove		= ts72xx_wdt_remove,
	.driver		= {
		.name	= "ts72xx-wdt",
		.owner	= THIS_MODULE,
	},
};

module_platform_driver(ts72xx_wdt_driver);

MODULE_AUTHOR("Mika Westerberg <[email protected]>");
MODULE_DESCRIPTION("TS-72xx SBC Watchdog");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:ts72xx-wdt");
Commit	Line	Data
c90bf2aa MW	1	/*
	2	* Watchdog driver for Technologic Systems TS-72xx based SBCs
	3	* (TS-7200, TS-7250 and TS-7260). These boards have external
	4	* glue logic CPLD chip, which includes programmable watchdog
	5	* timer.
	6	*
	7	* Copyright (c) 2009 Mika Westerberg <[email protected]>
	8	*
	9	* This driver is based on ep93xx_wdt and wm831x_wdt drivers.
	10	*
	11	* This file is licensed under the terms of the GNU General Public
	12	* License version 2. This program is licensed "as is" without any
	13	* warranty of any kind, whether express or implied.
	14	*/
	15
	16	#include <linux/fs.h>
	17	#include <linux/io.h>
	18	#include <linux/module.h>
	19	#include <linux/moduleparam.h>
	20	#include <linux/miscdevice.h>
	21	#include <linux/mutex.h>
	22	#include <linux/platform_device.h>
5a0e3ad6	23	#include <linux/slab.h>
c90bf2aa MW	24	#include <linux/watchdog.h>
	25	#include <linux/uaccess.h>
	26
	27	#define TS72XX_WDT_FEED_VAL 0x05
	28	#define TS72XX_WDT_DEFAULT_TIMEOUT 8
	29
	30	static int timeout = TS72XX_WDT_DEFAULT_TIMEOUT;
	31	module_param(timeout, int, 0);
	32	MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds. "
	33	"(1 <= timeout <= 8, default="
	34	__MODULE_STRING(TS72XX_WDT_DEFAULT_TIMEOUT)
	35	")");
	36
86a1e189 WVS	37	static bool nowayout = WATCHDOG_NOWAYOUT;
86a1e189 WVS	38	module_param(nowayout, bool, 0);
c90bf2aa MW	39	MODULE_PARM_DESC(nowayout, "Disable watchdog shutdown on close");
	40
	41	/**
	42	* struct ts72xx_wdt - watchdog control structure
	43	* @lock: lock that protects this structure
	44	* @regval: watchdog timeout value suitable for control register
	45	* @flags: flags controlling watchdog device state
	46	* @control_reg: watchdog control register
	47	* @feed_reg: watchdog feed register
	48	* @pdev: back pointer to platform dev
	49	*/
	50	struct ts72xx_wdt {
	51	struct mutex lock;
	52	int regval;
	53
	54	#define TS72XX_WDT_BUSY_FLAG 1
	55	#define TS72XX_WDT_EXPECT_CLOSE_FLAG 2
	56	int flags;
	57
	58	void __iomem *control_reg;
	59	void __iomem *feed_reg;
	60
	61	struct platform_device *pdev;
	62	};
	63
a17fb5cb	64	static struct platform_device *ts72xx_wdt_pdev;
c90bf2aa MW	65
	66	/*
	67	* TS-72xx Watchdog supports following timeouts (value written
	68	* to control register):
	69	* value description
	70	* -------------------------
5f3b2756	71	* 0x00 watchdog disabled
c90bf2aa MW	72	* 0x01 250ms
	73	* 0x02 500ms
	74	* 0x03 1s
	75	* 0x04 reserved
	76	* 0x05 2s
	77	* 0x06 4s
	78	* 0x07 8s
	79	*
	80	* Timeouts below 1s are not very usable so we don't
	81	* allow them at all.
	82	*
	83	* We provide two functions that convert between these:
	84	* timeout_to_regval() and regval_to_timeout().
	85	*/
	86	static const struct {
	87	int timeout;
	88	int regval;
	89	} ts72xx_wdt_map[] = {
	90	{ 1, 3 },
	91	{ 2, 5 },
	92	{ 4, 6 },
	93	{ 8, 7 },
	94	};
	95
	96	/**
	97	* timeout_to_regval() - converts given timeout to control register value
	98	* @new_timeout: timeout in seconds to be converted
	99	*
	100	* Function converts given @new_timeout into valid value that can
	101	* be programmed into watchdog control register. When conversion is
	102	* not possible, function returns %-EINVAL.
	103	*/
	104	static int timeout_to_regval(int new_timeout)
	105	{
	106	int i;
	107
	108	/* first limit it to 1 - 8 seconds */
	109	new_timeout = clamp_val(new_timeout, 1, 8);
	110
	111	for (i = 0; i < ARRAY_SIZE(ts72xx_wdt_map); i++) {
	112	if (ts72xx_wdt_map[i].timeout >= new_timeout)
	113	return ts72xx_wdt_map[i].regval;
	114	}
	115
	116	return -EINVAL;
	117	}
	118
	119	/**
	120	* regval_to_timeout() - converts control register value to timeout
	121	* @regval: control register value to be converted
	122	*
	123	* Function converts given @regval to timeout in seconds (1, 2, 4 or 8).
	124	* If @regval cannot be converted, function returns %-EINVAL.
	125	*/
	126	static int regval_to_timeout(int regval)
	127	{
	128	int i;
	129
	130	for (i = 0; i < ARRAY_SIZE(ts72xx_wdt_map); i++) {
	131	if (ts72xx_wdt_map[i].regval == regval)
	132	return ts72xx_wdt_map[i].timeout;
	133	}
	134
	135	return -EINVAL;
136	}
137
138	/**
139	* ts72xx_wdt_kick() - kick the watchdog
140	* @wdt: watchdog to be kicked
141	*
142	* Called with @wdt->lock held.
143	*/
144	static inline void ts72xx_wdt_kick(struct ts72xx_wdt *wdt)
145	{
146	__raw_writeb(TS72XX_WDT_FEED_VAL, wdt->feed_reg);
147	}
148
149	/**
150	* ts72xx_wdt_start() - starts the watchdog timer
151	* @wdt: watchdog to be started
152	*
153	* This function programs timeout to watchdog timer
154	* and starts it.
155	*
156	* Called with @wdt->lock held.
157	*/
158	static void ts72xx_wdt_start(struct ts72xx_wdt *wdt)
159	{
160	/*
161	* To program the wdt, it first must be "fed" and
162	* only after that (within 30 usecs) the configuration
163	* can be changed.
164	*/
165	ts72xx_wdt_kick(wdt);
166	__raw_writeb((u8)wdt->regval, wdt->control_reg);
167	}
168
169	/**
170	* ts72xx_wdt_stop() - stops the watchdog timer
171	* @wdt: watchdog to be stopped
172	*
173	* Called with @wdt->lock held.
174	*/
175	static void ts72xx_wdt_stop(struct ts72xx_wdt *wdt)
176	{
177	ts72xx_wdt_kick(wdt);
178	__raw_writeb(0, wdt->control_reg);
179	}
180
181	static int ts72xx_wdt_open(struct inode inode, struct file file)
182	{
183	struct ts72xx_wdt *wdt = platform_get_drvdata(ts72xx_wdt_pdev);
184	int regval;
185
186	/*
187	* Try to convert default timeout to valid register
188	* value first.
189	*/
190	regval = timeout_to_regval(timeout);
191	if (regval < 0) {
192	dev_err(&wdt->pdev->dev,
193	"failed to convert timeout (%d) to register value\n",
194	timeout);
67b9fbdf	195	return regval;
c90bf2aa MW	196	}
	197
	198	if (mutex_lock_interruptible(&wdt->lock))
	199	return -ERESTARTSYS;
	200
	201	if ((wdt->flags & TS72XX_WDT_BUSY_FLAG) != 0) {
	202	mutex_unlock(&wdt->lock);
	203	return -EBUSY;
	204	}
	205
	206	wdt->flags = TS72XX_WDT_BUSY_FLAG;
	207	wdt->regval = regval;
	208	file->private_data = wdt;
	209
	210	ts72xx_wdt_start(wdt);
	211
	212	mutex_unlock(&wdt->lock);
	213	return nonseekable_open(inode, file);
	214	}
	215
	216	static int ts72xx_wdt_release(struct inode inode, struct file file)
	217	{
	218	struct ts72xx_wdt *wdt = file->private_data;
	219
	220	if (mutex_lock_interruptible(&wdt->lock))
	221	return -ERESTARTSYS;
	222
	223	if ((wdt->flags & TS72XX_WDT_EXPECT_CLOSE_FLAG) != 0) {
	224	ts72xx_wdt_stop(wdt);
	225	} else {
	226	dev_warn(&wdt->pdev->dev,
	227	"TS-72XX WDT device closed unexpectly. "
	228	"Watchdog timer will not stop!\n");
	229	/*
	230	* Kick it one more time, to give userland some time
	231	* to recover (for example, respawning the kicker
	232	* daemon).
	233	*/
	234	ts72xx_wdt_kick(wdt);
	235	}
	236
	237	wdt->flags = 0;
	238
	239	mutex_unlock(&wdt->lock);
	240	return 0;
	241	}
	242
	243	static ssize_t ts72xx_wdt_write(struct file *file,
	244	const char __user *data,
	245	size_t len,
	246	loff_t *ppos)
	247	{
	248	struct ts72xx_wdt *wdt = file->private_data;
	249
	250	if (!len)
	251	return 0;
	252
	253	if (mutex_lock_interruptible(&wdt->lock))
	254	return -ERESTARTSYS;
	255
	256	ts72xx_wdt_kick(wdt);
	257
	258	/*
	259	* Support for magic character closing. User process
260	* writes 'V' into the device, just before it is closed.
261	* This means that we know that the wdt timer can be
262	* stopped after user closes the device.
263	*/
264	if (!nowayout) {
265	int i;
266
267	for (i = 0; i < len; i++) {
268	char c;
269
270	/* In case it was set long ago */
271	wdt->flags &= ~TS72XX_WDT_EXPECT_CLOSE_FLAG;
272
273	if (get_user(c, data + i)) {
274	mutex_unlock(&wdt->lock);
275	return -EFAULT;
276	}
277	if (c == 'V') {
278	wdt->flags \|= TS72XX_WDT_EXPECT_CLOSE_FLAG;
279	break;
280	}
281	}
282	}
283
284	mutex_unlock(&wdt->lock);
285	return len;
286	}
287
288	static const struct watchdog_info winfo = {
289	.options = WDIOF_KEEPALIVEPING \| WDIOF_SETTIMEOUT \|
290	WDIOF_MAGICCLOSE,
291	.firmware_version = 1,
292	.identity = "TS-72XX WDT",
293	};
294
295	static long ts72xx_wdt_ioctl(struct file *file, unsigned int cmd,
296	unsigned long arg)
297	{
298	struct ts72xx_wdt *wdt = file->private_data;
299	void __user argp = (void __user )arg;
300	int __user p = (int __user )argp;
301	int error = 0;
302
303	if (mutex_lock_interruptible(&wdt->lock))
304	return -ERESTARTSYS;
305
306	switch (cmd) {
307	case WDIOC_GETSUPPORT:
a20a99fb DC	308	if (copy_to_user(argp, &winfo, sizeof(winfo)))
a20a99fb DC	309	error = -EFAULT;
c90bf2aa MW	310	break;
c90bf2aa MW	311
f538ed9e WVS	312	case WDIOC_GETSTATUS:
f538ed9e WVS	313	case WDIOC_GETBOOTSTATUS:
8612ed0d DC	314	error = put_user(0, p);
8612ed0d DC	315	break;
f538ed9e	316
c90bf2aa MW	317	case WDIOC_KEEPALIVE:
	318	ts72xx_wdt_kick(wdt);
	319	break;
	320
	321	case WDIOC_SETOPTIONS: {
	322	int options;
	323
a20a99fb DC	324	error = get_user(options, p);
a20a99fb DC	325	if (error)
c90bf2aa	326	break;
c90bf2aa MW	327
	328	error = -EINVAL;
	329
	330	if ((options & WDIOS_DISABLECARD) != 0) {
	331	ts72xx_wdt_stop(wdt);
	332	error = 0;
	333	}
	334	if ((options & WDIOS_ENABLECARD) != 0) {
	335	ts72xx_wdt_start(wdt);
	336	error = 0;
	337	}
	338
	339	break;
	340	}
	341
	342	case WDIOC_SETTIMEOUT: {
	343	int new_timeout;
a20a99fb	344	int regval;
c90bf2aa	345
a20a99fb	346	error = get_user(new_timeout, p);
c90bf2aa MW	347	if (error)
	348	break;
	349
a20a99fb DC	350	regval = timeout_to_regval(new_timeout);
	351	if (regval < 0) {
	352	error = regval;
	353	break;
	354	}
	355	ts72xx_wdt_stop(wdt);
	356	wdt->regval = regval;
	357	ts72xx_wdt_start(wdt);
	358
c90bf2aa MW	359	/FALLTHROUGH/
	360	}
	361
	362	case WDIOC_GETTIMEOUT:
a20a99fb	363	error = put_user(regval_to_timeout(wdt->regval), p);
c90bf2aa MW	364	break;
	365
	366	default:
	367	error = -ENOTTY;
	368	break;
	369	}
	370
	371	mutex_unlock(&wdt->lock);
	372	return error;
	373	}
	374
	375	static const struct file_operations ts72xx_wdt_fops = {
	376	.owner = THIS_MODULE,
	377	.llseek = no_llseek,
	378	.open = ts72xx_wdt_open,
	379	.release = ts72xx_wdt_release,
	380	.write = ts72xx_wdt_write,
	381	.unlocked_ioctl = ts72xx_wdt_ioctl,
	382	};
	383
	384	static struct miscdevice ts72xx_wdt_miscdev = {
	385	.minor = WATCHDOG_MINOR,
	386	.name = "watchdog",
	387	.fops = &ts72xx_wdt_fops,
	388	};
	389
2d991a16	390	static int ts72xx_wdt_probe(struct platform_device *pdev)
c90bf2aa MW	391	{
	392	struct ts72xx_wdt *wdt;
	393	struct resource r1, r2;
	394	int error = 0;
	395
9d8a7f16	396	wdt = devm_kzalloc(&pdev->dev, sizeof(struct ts72xx_wdt), GFP_KERNEL);
8deea830	397	if (!wdt)
c90bf2aa	398	return -ENOMEM;
c90bf2aa MW	399
c90bf2aa MW	400	r1 = platform_get_resource(pdev, IORESOURCE_MEM, 0);
9d8a7f16 JH	401	wdt->control_reg = devm_ioremap_resource(&pdev->dev, r1);
	402	if (IS_ERR(wdt->control_reg))
	403	return PTR_ERR(wdt->control_reg);
c90bf2aa MW	404
c90bf2aa MW	405	r2 = platform_get_resource(pdev, IORESOURCE_MEM, 1);
9d8a7f16 JH	406	wdt->feed_reg = devm_ioremap_resource(&pdev->dev, r2);
	407	if (IS_ERR(wdt->feed_reg))
	408	return PTR_ERR(wdt->feed_reg);
c90bf2aa MW	409
	410	platform_set_drvdata(pdev, wdt);
	411	ts72xx_wdt_pdev = pdev;
	412	wdt->pdev = pdev;
	413	mutex_init(&wdt->lock);
	414
0e901bed MW	415	/* make sure that the watchdog is disabled */
	416	ts72xx_wdt_stop(wdt);
	417
c90bf2aa MW	418	error = misc_register(&ts72xx_wdt_miscdev);
	419	if (error) {
	420	dev_err(&pdev->dev, "failed to register miscdev\n");
9d8a7f16	421	return error;
c90bf2aa MW	422	}
	423
	424	dev_info(&pdev->dev, "TS-72xx Watchdog driver\n");
	425
	426	return 0;
c90bf2aa MW	427	}
c90bf2aa MW	428
4b12b896	429	static int ts72xx_wdt_remove(struct platform_device *pdev)
c90bf2aa	430	{
c90bf2aa MW	431	int error;
	432
	433	error = misc_deregister(&ts72xx_wdt_miscdev);
f538ed9e	434
c90bf2aa MW	435	return error;
	436	}
	437
	438	static struct platform_driver ts72xx_wdt_driver = {
	439	.probe = ts72xx_wdt_probe,
82268714	440	.remove = ts72xx_wdt_remove,
c90bf2aa MW	441	.driver = {
	442	.name = "ts72xx-wdt",
	443	.owner = THIS_MODULE,
	444	},
	445	};
	446
b8ec6118	447	module_platform_driver(ts72xx_wdt_driver);
c90bf2aa MW	448
	449	MODULE_AUTHOR("Mika Westerberg <[email protected]>");
	450	MODULE_DESCRIPTION("TS-72xx SBC Watchdog");
	451	MODULE_LICENSE("GPL");
	452	MODULE_ALIAS("platform:ts72xx-wdt");