[net-next-2.6.git] / drivers / rtc / rtc-mc13xxx.c

/*
 * Real Time Clock driver for Freescale MC13XXX PMIC
 *
 * (C) 2009 Sascha Hauer, Pengutronix
 * (C) 2009 Uwe Kleine-Koenig, Pengutronix
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/mfd/mc13xxx.h>
#include <linux/platform_device.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/rtc.h>

#define DRIVER_NAME "mc13xxx-rtc"

#define MC13XXX_RTCTOD	20
#define MC13XXX_RTCTODA	21
#define MC13XXX_RTCDAY	22
#define MC13XXX_RTCDAYA	23

struct mc13xxx_rtc {
	struct rtc_device *rtc;
	struct mc13xxx *mc13xxx;
	int valid;
};

static int mc13xxx_rtc_irq_enable_unlocked(struct device *dev,
		unsigned int enabled, int irq)
{
	struct mc13xxx_rtc *priv = dev_get_drvdata(dev);
	int (*func)(struct mc13xxx *mc13xxx, int irq);

	if (!priv->valid)
		return -ENODATA;

	func = enabled ? mc13xxx_irq_unmask : mc13xxx_irq_mask;
	return func(priv->mc13xxx, irq);
}

static int mc13xxx_rtc_irq_enable(struct device *dev,
		unsigned int enabled, int irq)
{
	struct mc13xxx_rtc *priv = dev_get_drvdata(dev);
	int ret;

	mc13xxx_lock(priv->mc13xxx);

	ret = mc13xxx_rtc_irq_enable_unlocked(dev, enabled, irq);

	mc13xxx_unlock(priv->mc13xxx);

	return ret;
}

static int mc13xxx_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
	struct mc13xxx_rtc *priv = dev_get_drvdata(dev);
	unsigned int seconds, days1, days2;
	unsigned long s1970;
	int ret;

	mc13xxx_lock(priv->mc13xxx);

	if (!priv->valid) {
		ret = -ENODATA;
		goto out;
	}

	ret = mc13xxx_reg_read(priv->mc13xxx, MC13XXX_RTCDAY, &days1);
	if (unlikely(ret))
		goto out;

	ret = mc13xxx_reg_read(priv->mc13xxx, MC13XXX_RTCTOD, &seconds);
	if (unlikely(ret))
		goto out;

	ret = mc13xxx_reg_read(priv->mc13xxx, MC13XXX_RTCDAY, &days2);
out:
	mc13xxx_unlock(priv->mc13xxx);

	if (ret)
		return ret;

	if (days2 == days1 + 1) {
		if (seconds >= 86400 / 2)
			days2 = days1;
		else
			days1 = days2;
	}

	if (days1 != days2)
		return -EIO;

	s1970 = days1 * 86400 + seconds;

	rtc_time_to_tm(s1970, tm);

	return rtc_valid_tm(tm);
}

static int mc13xxx_rtc_set_mmss(struct device *dev, unsigned long secs)
{
	struct mc13xxx_rtc *priv = dev_get_drvdata(dev);
	unsigned int seconds, days;
	unsigned int alarmseconds;
	int ret;

	seconds = secs % 86400;
	days = secs / 86400;

	mc13xxx_lock(priv->mc13xxx);

	/*
	 * temporarily invalidate alarm to prevent triggering it when the day is
	 * already updated while the time isn't yet.
	 */
	ret = mc13xxx_reg_read(priv->mc13xxx, MC13XXX_RTCTODA, &alarmseconds);
	if (unlikely(ret))
		goto out;

	if (alarmseconds < 86400) {
		ret = mc13xxx_reg_write(priv->mc13xxx,
				MC13XXX_RTCTODA, 0x1ffff);
		if (unlikely(ret))
			goto out;
	}

	/*
	 * write seconds=0 to prevent a day switch between writing days
	 * and seconds below
	 */
	ret = mc13xxx_reg_write(priv->mc13xxx, MC13XXX_RTCTOD, 0);
	if (unlikely(ret))
		goto out;

	ret = mc13xxx_reg_write(priv->mc13xxx, MC13XXX_RTCDAY, days);
	if (unlikely(ret))
		goto out;

	ret = mc13xxx_reg_write(priv->mc13xxx, MC13XXX_RTCTOD, seconds);
	if (unlikely(ret))
		goto out;

	/* restore alarm */
	if (alarmseconds < 86400) {
		ret = mc13xxx_reg_write(priv->mc13xxx,
				MC13XXX_RTCTODA, alarmseconds);
		if (unlikely(ret))
			goto out;
	}

	ret = mc13xxx_irq_ack(priv->mc13xxx, MC13XXX_IRQ_RTCRST);
	if (unlikely(ret))
		goto out;

	ret = mc13xxx_irq_unmask(priv->mc13xxx, MC13XXX_IRQ_RTCRST);
out:
	priv->valid = !ret;

	mc13xxx_unlock(priv->mc13xxx);

	return ret;
}

static int mc13xxx_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
{
	struct mc13xxx_rtc *priv = dev_get_drvdata(dev);
	unsigned seconds, days;
	unsigned long s1970;
	int enabled, pending;
	int ret;

	mc13xxx_lock(priv->mc13xxx);

	ret = mc13xxx_reg_read(priv->mc13xxx, MC13XXX_RTCTODA, &seconds);
	if (unlikely(ret))
		goto out;
	if (seconds >= 86400) {
		ret = -ENODATA;
		goto out;
	}

	ret = mc13xxx_reg_read(priv->mc13xxx, MC13XXX_RTCDAY, &days);
	if (unlikely(ret))
		goto out;

	ret = mc13xxx_irq_status(priv->mc13xxx, MC13XXX_IRQ_TODA,
			&enabled, &pending);

out:
	mc13xxx_unlock(priv->mc13xxx);

	if (ret)
		return ret;

	alarm->enabled = enabled;
	alarm->pending = pending;

	s1970 = days * 86400 + seconds;

	rtc_time_to_tm(s1970, &alarm->time);
	dev_dbg(dev, "%s: %lu\n", __func__, s1970);

	return 0;
}

static int mc13xxx_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
{
	struct mc13xxx_rtc *priv = dev_get_drvdata(dev);
	unsigned long s1970;
	unsigned seconds, days;
	int ret;

	mc13xxx_lock(priv->mc13xxx);

	/* disable alarm to prevent false triggering */
	ret = mc13xxx_reg_write(priv->mc13xxx, MC13XXX_RTCTODA, 0x1ffff);
	if (unlikely(ret))
		goto out;

	ret = mc13xxx_irq_ack(priv->mc13xxx, MC13XXX_IRQ_TODA);
	if (unlikely(ret))
		goto out;

	ret = rtc_tm_to_time(&alarm->time, &s1970);
	if (unlikely(ret))
		goto out;

	dev_dbg(dev, "%s: o%2.s %lu\n", __func__, alarm->enabled ? "n" : "ff",
			s1970);

	ret = mc13xxx_rtc_irq_enable_unlocked(dev, alarm->enabled,
			MC13XXX_IRQ_TODA);
	if (unlikely(ret))
		goto out;

	seconds = s1970 % 86400;
	days = s1970 / 86400;

	ret = mc13xxx_reg_write(priv->mc13xxx, MC13XXX_RTCDAYA, days);
	if (unlikely(ret))
		goto out;

	ret = mc13xxx_reg_write(priv->mc13xxx, MC13XXX_RTCTODA, seconds);

out:
	mc13xxx_unlock(priv->mc13xxx);

	return ret;
}

static irqreturn_t mc13xxx_rtc_alarm_handler(int irq, void *dev)
{
	struct mc13xxx_rtc *priv = dev;
	struct mc13xxx *mc13xxx = priv->mc13xxx;

	dev_dbg(&priv->rtc->dev, "Alarm\n");

	rtc_update_irq(priv->rtc, 1, RTC_IRQF | RTC_AF);

	mc13xxx_irq_ack(mc13xxx, irq);

	return IRQ_HANDLED;
}

static irqreturn_t mc13xxx_rtc_update_handler(int irq, void *dev)
{
	struct mc13xxx_rtc *priv = dev;
	struct mc13xxx *mc13xxx = priv->mc13xxx;

	dev_dbg(&priv->rtc->dev, "1HZ\n");

	rtc_update_irq(priv->rtc, 1, RTC_IRQF | RTC_UF);

	mc13xxx_irq_ack(mc13xxx, irq);

	return IRQ_HANDLED;
}

static int mc13xxx_rtc_update_irq_enable(struct device *dev,
		unsigned int enabled)
{
	return mc13xxx_rtc_irq_enable(dev, enabled, MC13XXX_IRQ_1HZ);
}

static int mc13xxx_rtc_alarm_irq_enable(struct device *dev,
		unsigned int enabled)
{
	return mc13xxx_rtc_irq_enable(dev, enabled, MC13XXX_IRQ_TODA);
}

static const struct rtc_class_ops mc13xxx_rtc_ops = {
	.read_time = mc13xxx_rtc_read_time,
	.set_mmss = mc13xxx_rtc_set_mmss,
	.read_alarm = mc13xxx_rtc_read_alarm,
	.set_alarm = mc13xxx_rtc_set_alarm,
	.alarm_irq_enable = mc13xxx_rtc_alarm_irq_enable,
	.update_irq_enable = mc13xxx_rtc_update_irq_enable,
};

static irqreturn_t mc13xxx_rtc_reset_handler(int irq, void *dev)
{
	struct mc13xxx_rtc *priv = dev;
	struct mc13xxx *mc13xxx = priv->mc13xxx;

	dev_dbg(&priv->rtc->dev, "RTCRST\n");
	priv->valid = 0;

	mc13xxx_irq_mask(mc13xxx, irq);

	return IRQ_HANDLED;
}

static int __devinit mc13xxx_rtc_probe(struct platform_device *pdev)
{
	int ret;
	struct mc13xxx_rtc *priv;
	struct mc13xxx *mc13xxx;
	int rtcrst_pending;

	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	mc13xxx = dev_get_drvdata(pdev->dev.parent);
	priv->mc13xxx = mc13xxx;

	platform_set_drvdata(pdev, priv);

	mc13xxx_lock(mc13xxx);

	ret = mc13xxx_irq_request(mc13xxx, MC13XXX_IRQ_RTCRST,
			mc13xxx_rtc_reset_handler, DRIVER_NAME, priv);
	if (ret)
		goto err_reset_irq_request;

	ret = mc13xxx_irq_status(mc13xxx, MC13XXX_IRQ_RTCRST,
			NULL, &rtcrst_pending);
	if (ret)
		goto err_reset_irq_status;

	priv->valid = !rtcrst_pending;

	ret = mc13xxx_irq_request_nounmask(mc13xxx, MC13XXX_IRQ_1HZ,
			mc13xxx_rtc_update_handler, DRIVER_NAME, priv);
	if (ret)
		goto err_update_irq_request;

	ret = mc13xxx_irq_request_nounmask(mc13xxx, MC13XXX_IRQ_TODA,
			mc13xxx_rtc_alarm_handler, DRIVER_NAME, priv);
	if (ret)
		goto err_alarm_irq_request;

	priv->rtc = rtc_device_register(pdev->name,
			&pdev->dev, &mc13xxx_rtc_ops, THIS_MODULE);
	if (IS_ERR(priv->rtc)) {
		ret = PTR_ERR(priv->rtc);

		mc13xxx_irq_free(mc13xxx, MC13XXX_IRQ_TODA, priv);
err_alarm_irq_request:

		mc13xxx_irq_free(mc13xxx, MC13XXX_IRQ_1HZ, priv);
err_update_irq_request:

err_reset_irq_status:

		mc13xxx_irq_free(mc13xxx, MC13XXX_IRQ_RTCRST, priv);
err_reset_irq_request:

		platform_set_drvdata(pdev, NULL);
		kfree(priv);
	}

	mc13xxx_unlock(mc13xxx);

	return ret;
}

static int __devexit mc13xxx_rtc_remove(struct platform_device *pdev)
{
	struct mc13xxx_rtc *priv = platform_get_drvdata(pdev);

	mc13xxx_lock(priv->mc13xxx);

	rtc_device_unregister(priv->rtc);

	mc13xxx_irq_free(priv->mc13xxx, MC13XXX_IRQ_TODA, priv);
	mc13xxx_irq_free(priv->mc13xxx, MC13XXX_IRQ_1HZ, priv);
	mc13xxx_irq_free(priv->mc13xxx, MC13XXX_IRQ_RTCRST, priv);

	mc13xxx_unlock(priv->mc13xxx);

	platform_set_drvdata(pdev, NULL);

	kfree(priv);

	return 0;
}

const struct platform_device_id mc13xxx_rtc_idtable[] = {
	{
		.name = "mc13783-rtc",
	}, {
		.name = "mc13892-rtc",
	},
};

static struct platform_driver mc13xxx_rtc_driver = {
	.id_table = mc13xxx_rtc_idtable,
	.remove = __devexit_p(mc13xxx_rtc_remove),
	.driver = {
		.name = DRIVER_NAME,
		.owner = THIS_MODULE,
	},
};

static int __init mc13xxx_rtc_init(void)
{
	return platform_driver_probe(&mc13xxx_rtc_driver, &mc13xxx_rtc_probe);
}
module_init(mc13xxx_rtc_init);

static void __exit mc13xxx_rtc_exit(void)
{
	platform_driver_unregister(&mc13xxx_rtc_driver);
}
module_exit(mc13xxx_rtc_exit);

MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
MODULE_DESCRIPTION("RTC driver for Freescale MC13XXX PMIC");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:" DRIVER_NAME);
Commit	Line	Data
1c97872b UKK	1	/*
	2	* Real Time Clock driver for Freescale MC13XXX PMIC
	3	*
	4	* (C) 2009 Sascha Hauer, Pengutronix
	5	* (C) 2009 Uwe Kleine-Koenig, Pengutronix
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*/
	11
	12	#include <linux/mfd/mc13xxx.h>
	13	#include <linux/platform_device.h>
	14	#include <linux/kernel.h>
	15	#include <linux/module.h>
	16	#include <linux/slab.h>
	17	#include <linux/rtc.h>
	18
	19	#define DRIVER_NAME "mc13xxx-rtc"
	20
	21	#define MC13XXX_RTCTOD 20
	22	#define MC13XXX_RTCTODA 21
	23	#define MC13XXX_RTCDAY 22
	24	#define MC13XXX_RTCDAYA 23
	25
	26	struct mc13xxx_rtc {
	27	struct rtc_device *rtc;
	28	struct mc13xxx *mc13xxx;
	29	int valid;
	30	};
	31
	32	static int mc13xxx_rtc_irq_enable_unlocked(struct device *dev,
	33	unsigned int enabled, int irq)
	34	{
	35	struct mc13xxx_rtc *priv = dev_get_drvdata(dev);
	36	int (func)(struct mc13xxx mc13xxx, int irq);
	37
	38	if (!priv->valid)
	39	return -ENODATA;
	40
	41	func = enabled ? mc13xxx_irq_unmask : mc13xxx_irq_mask;
	42	return func(priv->mc13xxx, irq);
	43	}
	44
	45	static int mc13xxx_rtc_irq_enable(struct device *dev,
	46	unsigned int enabled, int irq)
	47	{
	48	struct mc13xxx_rtc *priv = dev_get_drvdata(dev);
	49	int ret;
	50
	51	mc13xxx_lock(priv->mc13xxx);
	52
	53	ret = mc13xxx_rtc_irq_enable_unlocked(dev, enabled, irq);
	54
	55	mc13xxx_unlock(priv->mc13xxx);
	56
	57	return ret;
	58	}
	59
	60	static int mc13xxx_rtc_read_time(struct device dev, struct rtc_time tm)
	61	{
	62	struct mc13xxx_rtc *priv = dev_get_drvdata(dev);
	63	unsigned int seconds, days1, days2;
	64	unsigned long s1970;
65	int ret;
66
67	mc13xxx_lock(priv->mc13xxx);
68
69	if (!priv->valid) {
70	ret = -ENODATA;
71	goto out;
72	}
73
74	ret = mc13xxx_reg_read(priv->mc13xxx, MC13XXX_RTCDAY, &days1);
75	if (unlikely(ret))
76	goto out;
77
78	ret = mc13xxx_reg_read(priv->mc13xxx, MC13XXX_RTCTOD, &seconds);
79	if (unlikely(ret))
80	goto out;
81
82	ret = mc13xxx_reg_read(priv->mc13xxx, MC13XXX_RTCDAY, &days2);
83	out:
84	mc13xxx_unlock(priv->mc13xxx);
85
86	if (ret)
87	return ret;
88
89	if (days2 == days1 + 1) {
90	if (seconds >= 86400 / 2)
91	days2 = days1;
92	else
93	days1 = days2;
94	}
95
96	if (days1 != days2)
97	return -EIO;
98
99	s1970 = days1 * 86400 + seconds;
100
101	rtc_time_to_tm(s1970, tm);
102
103	return rtc_valid_tm(tm);
104	}
105
106	static int mc13xxx_rtc_set_mmss(struct device *dev, unsigned long secs)
107	{
108	struct mc13xxx_rtc *priv = dev_get_drvdata(dev);
109	unsigned int seconds, days;
110	unsigned int alarmseconds;
111	int ret;
112
113	seconds = secs % 86400;
114	days = secs / 86400;
115
116	mc13xxx_lock(priv->mc13xxx);
117
118	/*
119	* temporarily invalidate alarm to prevent triggering it when the day is
120	* already updated while the time isn't yet.
121	*/
122	ret = mc13xxx_reg_read(priv->mc13xxx, MC13XXX_RTCTODA, &alarmseconds);
123	if (unlikely(ret))
124	goto out;
125
126	if (alarmseconds < 86400) {
127	ret = mc13xxx_reg_write(priv->mc13xxx,
128	MC13XXX_RTCTODA, 0x1ffff);
129	if (unlikely(ret))
130	goto out;
131	}
132
133	/*
134	* write seconds=0 to prevent a day switch between writing days
135	* and seconds below
136	*/
137	ret = mc13xxx_reg_write(priv->mc13xxx, MC13XXX_RTCTOD, 0);
138	if (unlikely(ret))
139	goto out;
140
141	ret = mc13xxx_reg_write(priv->mc13xxx, MC13XXX_RTCDAY, days);
142	if (unlikely(ret))
143	goto out;
144
145	ret = mc13xxx_reg_write(priv->mc13xxx, MC13XXX_RTCTOD, seconds);
146	if (unlikely(ret))
147	goto out;
148
149	/* restore alarm */
150	if (alarmseconds < 86400) {
151	ret = mc13xxx_reg_write(priv->mc13xxx,
152	MC13XXX_RTCTODA, alarmseconds);
153	if (unlikely(ret))
154	goto out;
155	}
156
157	ret = mc13xxx_irq_ack(priv->mc13xxx, MC13XXX_IRQ_RTCRST);
158	if (unlikely(ret))
159	goto out;
160
161	ret = mc13xxx_irq_unmask(priv->mc13xxx, MC13XXX_IRQ_RTCRST);
162	out:
163	priv->valid = !ret;
164
165	mc13xxx_unlock(priv->mc13xxx);
166
167	return ret;
168	}
169
170	static int mc13xxx_rtc_read_alarm(struct device dev, struct rtc_wkalrm alarm)
171	{
172	struct mc13xxx_rtc *priv = dev_get_drvdata(dev);
173	unsigned seconds, days;
174	unsigned long s1970;
175	int enabled, pending;
176	int ret;
177
178	mc13xxx_lock(priv->mc13xxx);
179
180	ret = mc13xxx_reg_read(priv->mc13xxx, MC13XXX_RTCTODA, &seconds);
181	if (unlikely(ret))
182	goto out;
183	if (seconds >= 86400) {
184	ret = -ENODATA;
185	goto out;
186	}
187
188	ret = mc13xxx_reg_read(priv->mc13xxx, MC13XXX_RTCDAY, &days);
189	if (unlikely(ret))
190	goto out;
191
192	ret = mc13xxx_irq_status(priv->mc13xxx, MC13XXX_IRQ_TODA,
193	&enabled, &pending);
194
195	out:
196	mc13xxx_unlock(priv->mc13xxx);
197
198	if (ret)
199	return ret;
200
201	alarm->enabled = enabled;
202	alarm->pending = pending;
203
204	s1970 = days * 86400 + seconds;
205
206	rtc_time_to_tm(s1970, &alarm->time);
207	dev_dbg(dev, "%s: %lu\n", __func__, s1970);
208
209	return 0;
210	}
211
212	static int mc13xxx_rtc_set_alarm(struct device dev, struct rtc_wkalrm alarm)
213	{
214	struct mc13xxx_rtc *priv = dev_get_drvdata(dev);
215	unsigned long s1970;
216	unsigned seconds, days;
217	int ret;
218
219	mc13xxx_lock(priv->mc13xxx);
220
221	/* disable alarm to prevent false triggering */
222	ret = mc13xxx_reg_write(priv->mc13xxx, MC13XXX_RTCTODA, 0x1ffff);
223	if (unlikely(ret))
224	goto out;
225
226	ret = mc13xxx_irq_ack(priv->mc13xxx, MC13XXX_IRQ_TODA);
227	if (unlikely(ret))
228	goto out;
229
230	ret = rtc_tm_to_time(&alarm->time, &s1970);
231	if (unlikely(ret))
232	goto out;
233
234	dev_dbg(dev, "%s: o%2.s %lu\n", __func__, alarm->enabled ? "n" : "ff",
235	s1970);
236
237	ret = mc13xxx_rtc_irq_enable_unlocked(dev, alarm->enabled,
238	MC13XXX_IRQ_TODA);
239	if (unlikely(ret))
240	goto out;
241
242	seconds = s1970 % 86400;
243	days = s1970 / 86400;
244
245	ret = mc13xxx_reg_write(priv->mc13xxx, MC13XXX_RTCDAYA, days);
246	if (unlikely(ret))
247	goto out;
248
249	ret = mc13xxx_reg_write(priv->mc13xxx, MC13XXX_RTCTODA, seconds);
250
251	out:
252	mc13xxx_unlock(priv->mc13xxx);
253
254	return ret;
255	}
256
257	static irqreturn_t mc13xxx_rtc_alarm_handler(int irq, void *dev)
258	{
259	struct mc13xxx_rtc *priv = dev;
260	struct mc13xxx *mc13xxx = priv->mc13xxx;
261
262	dev_dbg(&priv->rtc->dev, "Alarm\n");
263
264	rtc_update_irq(priv->rtc, 1, RTC_IRQF \| RTC_AF);
265
266	mc13xxx_irq_ack(mc13xxx, irq);
267
268	return IRQ_HANDLED;
269	}
270
271	static irqreturn_t mc13xxx_rtc_update_handler(int irq, void *dev)
272	{
273	struct mc13xxx_rtc *priv = dev;
274	struct mc13xxx *mc13xxx = priv->mc13xxx;
275
276	dev_dbg(&priv->rtc->dev, "1HZ\n");
277
278	rtc_update_irq(priv->rtc, 1, RTC_IRQF \| RTC_UF);
279
280	mc13xxx_irq_ack(mc13xxx, irq);
281
282	return IRQ_HANDLED;
283	}
284
285	static int mc13xxx_rtc_update_irq_enable(struct device *dev,
286	unsigned int enabled)
287	{
288	return mc13xxx_rtc_irq_enable(dev, enabled, MC13XXX_IRQ_1HZ);
289	}
290
291	static int mc13xxx_rtc_alarm_irq_enable(struct device *dev,
292	unsigned int enabled)
293	{
294	return mc13xxx_rtc_irq_enable(dev, enabled, MC13XXX_IRQ_TODA);
295	}
296
297	static const struct rtc_class_ops mc13xxx_rtc_ops = {
298	.read_time = mc13xxx_rtc_read_time,
299	.set_mmss = mc13xxx_rtc_set_mmss,
300	.read_alarm = mc13xxx_rtc_read_alarm,
301	.set_alarm = mc13xxx_rtc_set_alarm,
302	.alarm_irq_enable = mc13xxx_rtc_alarm_irq_enable,
303	.update_irq_enable = mc13xxx_rtc_update_irq_enable,
304	};
305
306	static irqreturn_t mc13xxx_rtc_reset_handler(int irq, void *dev)
307	{
308	struct mc13xxx_rtc *priv = dev;
309	struct mc13xxx *mc13xxx = priv->mc13xxx;
310
311	dev_dbg(&priv->rtc->dev, "RTCRST\n");
312	priv->valid = 0;
313
314	mc13xxx_irq_mask(mc13xxx, irq);
315
316	return IRQ_HANDLED;
317	}
318
319	static int __devinit mc13xxx_rtc_probe(struct platform_device *pdev)
320	{
321	int ret;
322	struct mc13xxx_rtc *priv;
323	struct mc13xxx *mc13xxx;
324	int rtcrst_pending;
325
326	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
327	if (!priv)
328	return -ENOMEM;
329
330	mc13xxx = dev_get_drvdata(pdev->dev.parent);
331	priv->mc13xxx = mc13xxx;
332
333	platform_set_drvdata(pdev, priv);
334
335	mc13xxx_lock(mc13xxx);
336
337	ret = mc13xxx_irq_request(mc13xxx, MC13XXX_IRQ_RTCRST,
338	mc13xxx_rtc_reset_handler, DRIVER_NAME, priv);
339	if (ret)
340	goto err_reset_irq_request;
341
342	ret = mc13xxx_irq_status(mc13xxx, MC13XXX_IRQ_RTCRST,
343	NULL, &rtcrst_pending);
344	if (ret)
345	goto err_reset_irq_status;
346
347	priv->valid = !rtcrst_pending;
348
349	ret = mc13xxx_irq_request_nounmask(mc13xxx, MC13XXX_IRQ_1HZ,
350	mc13xxx_rtc_update_handler, DRIVER_NAME, priv);
351	if (ret)
352	goto err_update_irq_request;
353
354	ret = mc13xxx_irq_request_nounmask(mc13xxx, MC13XXX_IRQ_TODA,
355	mc13xxx_rtc_alarm_handler, DRIVER_NAME, priv);
356	if (ret)
357	goto err_alarm_irq_request;
358
359	priv->rtc = rtc_device_register(pdev->name,
360	&pdev->dev, &mc13xxx_rtc_ops, THIS_MODULE);
361	if (IS_ERR(priv->rtc)) {
362	ret = PTR_ERR(priv->rtc);
363
364	mc13xxx_irq_free(mc13xxx, MC13XXX_IRQ_TODA, priv);
365	err_alarm_irq_request:
366
367	mc13xxx_irq_free(mc13xxx, MC13XXX_IRQ_1HZ, priv);
368	err_update_irq_request:
369
370	err_reset_irq_status:
371
372	mc13xxx_irq_free(mc13xxx, MC13XXX_IRQ_RTCRST, priv);
373	err_reset_irq_request:
374
375	platform_set_drvdata(pdev, NULL);
376	kfree(priv);
377	}
378
379	mc13xxx_unlock(mc13xxx);
380
381	return ret;
382	}
383
384	static int __devexit mc13xxx_rtc_remove(struct platform_device *pdev)
385	{
386	struct mc13xxx_rtc *priv = platform_get_drvdata(pdev);
387
388	mc13xxx_lock(priv->mc13xxx);
389
390	rtc_device_unregister(priv->rtc);
391
392	mc13xxx_irq_free(priv->mc13xxx, MC13XXX_IRQ_TODA, priv);
393	mc13xxx_irq_free(priv->mc13xxx, MC13XXX_IRQ_1HZ, priv);
394	mc13xxx_irq_free(priv->mc13xxx, MC13XXX_IRQ_RTCRST, priv);
395
396	mc13xxx_unlock(priv->mc13xxx);
397
398	platform_set_drvdata(pdev, NULL);
399
400	kfree(priv);
401
402	return 0;
403	}
404
405	const struct platform_device_id mc13xxx_rtc_idtable[] = {
406	{
407	.name = "mc13783-rtc",
408	}, {
409	.name = "mc13892-rtc",
410	},
411	};
412
413	static struct platform_driver mc13xxx_rtc_driver = {
414	.id_table = mc13xxx_rtc_idtable,
415	.remove = __devexit_p(mc13xxx_rtc_remove),
416	.driver = {
417	.name = DRIVER_NAME,
418	.owner = THIS_MODULE,
419	},
420	};
421
422	static int __init mc13xxx_rtc_init(void)
423	{
424	return platform_driver_probe(&mc13xxx_rtc_driver, &mc13xxx_rtc_probe);
425	}
426	module_init(mc13xxx_rtc_init);
427
428	static void __exit mc13xxx_rtc_exit(void)
429	{
430	platform_driver_unregister(&mc13xxx_rtc_driver);
431	}
432	module_exit(mc13xxx_rtc_exit);
433
434	MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
435	MODULE_DESCRIPTION("RTC driver for Freescale MC13XXX PMIC");
436	MODULE_LICENSE("GPL v2");
437	MODULE_ALIAS("platform:" DRIVER_NAME);