[linux-2.6-block.git] / drivers / rtc / rtc-tps6586x.c

/*
 * rtc-tps6586x.c: RTC driver for TI PMIC TPS6586X
 *
 * Copyright (c) 2012, NVIDIA Corporation.
 *
 * Author: Laxman Dewangan <ldewangan@nvidia.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 version 2.
 *
 * This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,
 * whether express or implied; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
 * 02111-1307, USA
 */

#include <linux/device.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/mfd/tps6586x.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/rtc.h>
#include <linux/slab.h>

#define RTC_CTRL			0xc0
#define POR_RESET_N			BIT(7)
#define OSC_SRC_SEL			BIT(6)
#define RTC_ENABLE			BIT(5)	/* enables alarm */
#define RTC_BUF_ENABLE			BIT(4)	/* 32 KHz buffer enable */
#define PRE_BYPASS			BIT(3)	/* 0=1KHz or 1=32KHz updates */
#define CL_SEL_MASK			(BIT(2)|BIT(1))
#define CL_SEL_POS			1
#define RTC_ALARM1_HI			0xc1
#define RTC_COUNT4			0xc6

/* start a PMU RTC access by reading the register prior to the RTC_COUNT4 */
#define RTC_COUNT4_DUMMYREAD		0xc5

/*only 14-bits width in second*/
#define ALM1_VALID_RANGE_IN_SEC		0x3FFF

#define TPS6586X_RTC_CL_SEL_1_5PF	0x0
#define TPS6586X_RTC_CL_SEL_6_5PF	0x1
#define TPS6586X_RTC_CL_SEL_7_5PF	0x2
#define TPS6586X_RTC_CL_SEL_12_5PF	0x3

struct tps6586x_rtc {
	struct device		*dev;
	struct rtc_device	*rtc;
	int			irq;
	bool			irq_en;
};

static inline struct device *to_tps6586x_dev(struct device *dev)
{
	return dev->parent;
}

static int tps6586x_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
	struct device *tps_dev = to_tps6586x_dev(dev);
	unsigned long long ticks = 0;
	time64_t seconds;
	u8 buff[6];
	int ret;
	int i;

	ret = tps6586x_reads(tps_dev, RTC_COUNT4_DUMMYREAD, sizeof(buff), buff);
	if (ret < 0) {
		dev_err(dev, "read counter failed with err %d\n", ret);
		return ret;
	}

	for (i = 1; i < sizeof(buff); i++) {
		ticks <<= 8;
		ticks |= buff[i];
	}

	seconds = ticks >> 10;
	rtc_time64_to_tm(seconds, tm);

	return 0;
}

static int tps6586x_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
	struct device *tps_dev = to_tps6586x_dev(dev);
	unsigned long long ticks;
	time64_t seconds;
	u8 buff[5];
	int ret;

	seconds = rtc_tm_to_time64(tm);

	ticks = (unsigned long long)seconds << 10;
	buff[0] = (ticks >> 32) & 0xff;
	buff[1] = (ticks >> 24) & 0xff;
	buff[2] = (ticks >> 16) & 0xff;
	buff[3] = (ticks >> 8) & 0xff;
	buff[4] = ticks & 0xff;

	/* Disable RTC before changing time */
	ret = tps6586x_clr_bits(tps_dev, RTC_CTRL, RTC_ENABLE);
	if (ret < 0) {
		dev_err(dev, "failed to clear RTC_ENABLE\n");
		return ret;
	}

	ret = tps6586x_writes(tps_dev, RTC_COUNT4, sizeof(buff), buff);
	if (ret < 0) {
		dev_err(dev, "failed to program new time\n");
		return ret;
	}

	/* Enable RTC */
	ret = tps6586x_set_bits(tps_dev, RTC_CTRL, RTC_ENABLE);
	if (ret < 0) {
		dev_err(dev, "failed to set RTC_ENABLE\n");
		return ret;
	}
	return 0;
}

static int tps6586x_rtc_alarm_irq_enable(struct device *dev,
			 unsigned int enabled)
{
	struct tps6586x_rtc *rtc = dev_get_drvdata(dev);

	if (enabled && !rtc->irq_en) {
		enable_irq(rtc->irq);
		rtc->irq_en = true;
	} else if (!enabled && rtc->irq_en)  {
		disable_irq(rtc->irq);
		rtc->irq_en = false;
	}
	return 0;
}

static int tps6586x_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
	struct device *tps_dev = to_tps6586x_dev(dev);
	time64_t seconds;
	unsigned long ticks;
	unsigned long rtc_current_time;
	unsigned long long rticks = 0;
	u8 buff[3];
	u8 rbuff[6];
	int ret;
	int i;

	seconds = rtc_tm_to_time64(&alrm->time);

	ret = tps6586x_rtc_alarm_irq_enable(dev, alrm->enabled);
	if (ret < 0) {
		dev_err(dev, "can't set alarm irq, err %d\n", ret);
		return ret;
	}

	ret = tps6586x_reads(tps_dev, RTC_COUNT4_DUMMYREAD,
			sizeof(rbuff), rbuff);
	if (ret < 0) {
		dev_err(dev, "read counter failed with err %d\n", ret);
		return ret;
	}

	for (i = 1; i < sizeof(rbuff); i++) {
		rticks <<= 8;
		rticks |= rbuff[i];
	}

	rtc_current_time = rticks >> 10;
	if ((seconds - rtc_current_time) > ALM1_VALID_RANGE_IN_SEC)
		seconds = rtc_current_time - 1;

	ticks = (unsigned long long)seconds << 10;
	buff[0] = (ticks >> 16) & 0xff;
	buff[1] = (ticks >> 8) & 0xff;
	buff[2] = ticks & 0xff;

	ret = tps6586x_writes(tps_dev, RTC_ALARM1_HI, sizeof(buff), buff);
	if (ret)
		dev_err(dev, "programming alarm failed with err %d\n", ret);

	return ret;
}

static int tps6586x_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
	struct device *tps_dev = to_tps6586x_dev(dev);
	unsigned long ticks;
	time64_t seconds;
	u8 buff[3];
	int ret;

	ret = tps6586x_reads(tps_dev, RTC_ALARM1_HI, sizeof(buff), buff);
	if (ret) {
		dev_err(dev, "read RTC_ALARM1_HI failed with err %d\n", ret);
		return ret;
	}

	ticks = (buff[0] << 16) | (buff[1] << 8) | buff[2];
	seconds = ticks >> 10;

	rtc_time64_to_tm(seconds, &alrm->time);
	return 0;
}

static const struct rtc_class_ops tps6586x_rtc_ops = {
	.read_time	= tps6586x_rtc_read_time,
	.set_time	= tps6586x_rtc_set_time,
	.set_alarm	= tps6586x_rtc_set_alarm,
	.read_alarm	= tps6586x_rtc_read_alarm,
	.alarm_irq_enable = tps6586x_rtc_alarm_irq_enable,
};

static irqreturn_t tps6586x_rtc_irq(int irq, void *data)
{
	struct tps6586x_rtc *rtc = data;

	rtc_update_irq(rtc->rtc, 1, RTC_IRQF | RTC_AF);
	return IRQ_HANDLED;
}

static int tps6586x_rtc_probe(struct platform_device *pdev)
{
	struct device *tps_dev = to_tps6586x_dev(&pdev->dev);
	struct tps6586x_rtc *rtc;
	int ret;

	rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL);
	if (!rtc)
		return -ENOMEM;

	rtc->dev = &pdev->dev;
	rtc->irq = platform_get_irq(pdev, 0);

	/* 1 kHz tick mode, enable tick counting */
	ret = tps6586x_update(tps_dev, RTC_CTRL,
		RTC_ENABLE | OSC_SRC_SEL |
		((TPS6586X_RTC_CL_SEL_1_5PF << CL_SEL_POS) & CL_SEL_MASK),
		RTC_ENABLE | OSC_SRC_SEL | PRE_BYPASS | CL_SEL_MASK);
	if (ret < 0) {
		dev_err(&pdev->dev, "unable to start counter\n");
		return ret;
	}

	device_init_wakeup(&pdev->dev, 1);

	platform_set_drvdata(pdev, rtc);
	rtc->rtc = devm_rtc_allocate_device(&pdev->dev);
	if (IS_ERR(rtc->rtc)) {
		ret = PTR_ERR(rtc->rtc);
		dev_err(&pdev->dev, "RTC allocate device: ret %d\n", ret);
		goto fail_rtc_register;
	}

	rtc->rtc->ops = &tps6586x_rtc_ops;
	rtc->rtc->range_max = (1ULL << 30) - 1; /* 30-bit seconds */
	rtc->rtc->start_secs = mktime64(2009, 1, 1, 0, 0, 0);
	rtc->rtc->set_start_time = true;

	ret = devm_request_threaded_irq(&pdev->dev, rtc->irq, NULL,
				tps6586x_rtc_irq,
				IRQF_ONESHOT,
				dev_name(&pdev->dev), rtc);
	if (ret < 0) {
		dev_err(&pdev->dev, "request IRQ(%d) failed with ret %d\n",
				rtc->irq, ret);
		goto fail_rtc_register;
	}
	disable_irq(rtc->irq);

	ret = rtc_register_device(rtc->rtc);
	if (ret) {
		dev_err(&pdev->dev, "RTC device register: ret %d\n", ret);
		goto fail_rtc_register;
	}

	return 0;

fail_rtc_register:
	tps6586x_update(tps_dev, RTC_CTRL, 0,
		RTC_ENABLE | OSC_SRC_SEL | PRE_BYPASS | CL_SEL_MASK);
	return ret;
};

static int tps6586x_rtc_remove(struct platform_device *pdev)
{
	struct device *tps_dev = to_tps6586x_dev(&pdev->dev);

	tps6586x_update(tps_dev, RTC_CTRL, 0,
		RTC_ENABLE | OSC_SRC_SEL | PRE_BYPASS | CL_SEL_MASK);
	return 0;
}

#ifdef CONFIG_PM_SLEEP
static int tps6586x_rtc_suspend(struct device *dev)
{
	struct tps6586x_rtc *rtc = dev_get_drvdata(dev);

	if (device_may_wakeup(dev))
		enable_irq_wake(rtc->irq);
	return 0;
}

static int tps6586x_rtc_resume(struct device *dev)
{
	struct tps6586x_rtc *rtc = dev_get_drvdata(dev);

	if (device_may_wakeup(dev))
		disable_irq_wake(rtc->irq);
	return 0;
}
#endif

static SIMPLE_DEV_PM_OPS(tps6586x_pm_ops, tps6586x_rtc_suspend,
			tps6586x_rtc_resume);

static struct platform_driver tps6586x_rtc_driver = {
	.driver	= {
		.name	= "tps6586x-rtc",
		.pm	= &tps6586x_pm_ops,
	},
	.probe	= tps6586x_rtc_probe,
	.remove	= tps6586x_rtc_remove,
};
module_platform_driver(tps6586x_rtc_driver);

MODULE_ALIAS("platform:tps6586x-rtc");
MODULE_DESCRIPTION("TI TPS6586x RTC driver");
MODULE_AUTHOR("Laxman dewangan <ldewangan@nvidia.com>");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
dc59ed38 LD	1	/*
	2	* rtc-tps6586x.c: RTC driver for TI PMIC TPS6586X
	3	*
	4	* Copyright (c) 2012, NVIDIA Corporation.
	5	*
	6	* Author: Laxman Dewangan <ldewangan@nvidia.com>
	7	*
	8	* This program is free software; you can redistribute it and/or
	9	* modify it under the terms of the GNU General Public License as
	10	* published by the Free Software Foundation version 2.
	11	*
	12	* This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,
	13	* whether express or implied; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	15	* General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program; if not, write to the Free Software
	19	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
	20	* 02111-1307, USA
	21	*/
	22
	23	#include <linux/device.h>
	24	#include <linux/err.h>
	25	#include <linux/init.h>
	26	#include <linux/kernel.h>
	27	#include <linux/mfd/tps6586x.h>
	28	#include <linux/module.h>
	29	#include <linux/platform_device.h>
	30	#include <linux/pm_runtime.h>
	31	#include <linux/rtc.h>
	32	#include <linux/slab.h>
	33
	34	#define RTC_CTRL 0xc0
	35	#define POR_RESET_N BIT(7)
	36	#define OSC_SRC_SEL BIT(6)
	37	#define RTC_ENABLE BIT(5) /* enables alarm */
	38	#define RTC_BUF_ENABLE BIT(4) /* 32 KHz buffer enable */
	39	#define PRE_BYPASS BIT(3) /* 0=1KHz or 1=32KHz updates */
	40	#define CL_SEL_MASK (BIT(2)\|BIT(1))
	41	#define CL_SEL_POS 1
	42	#define RTC_ALARM1_HI 0xc1
	43	#define RTC_COUNT4 0xc6
	44
	45	/* start a PMU RTC access by reading the register prior to the RTC_COUNT4 */
	46	#define RTC_COUNT4_DUMMYREAD 0xc5
	47
	48	/only 14-bits width in second/
	49	#define ALM1_VALID_RANGE_IN_SEC 0x3FFF
	50
	51	#define TPS6586X_RTC_CL_SEL_1_5PF 0x0
	52	#define TPS6586X_RTC_CL_SEL_6_5PF 0x1
	53	#define TPS6586X_RTC_CL_SEL_7_5PF 0x2
	54	#define TPS6586X_RTC_CL_SEL_12_5PF 0x3
	55
	56	struct tps6586x_rtc {
	57	struct device *dev;
	58	struct rtc_device *rtc;
	59	int irq;
	60	bool irq_en;
dc59ed38 LD	61	};
	62
	63	static inline struct device to_tps6586x_dev(struct device dev)
	64	{
	65	return dev->parent;
	66	}
	67
	68	static int tps6586x_rtc_read_time(struct device dev, struct rtc_time tm)
	69	{
dc59ed38 LD	70	struct device *tps_dev = to_tps6586x_dev(dev);
dc59ed38 LD	71	unsigned long long ticks = 0;
7982df86	72	time64_t seconds;
dc59ed38 LD	73	u8 buff[6];
	74	int ret;
	75	int i;
	76
	77	ret = tps6586x_reads(tps_dev, RTC_COUNT4_DUMMYREAD, sizeof(buff), buff);
	78	if (ret < 0) {
	79	dev_err(dev, "read counter failed with err %d\n", ret);
	80	return ret;
	81	}
	82
	83	for (i = 1; i < sizeof(buff); i++) {
	84	ticks <<= 8;
	85	ticks \|= buff[i];
	86	}
	87
	88	seconds = ticks >> 10;
180c92c4 AB	89	rtc_time64_to_tm(seconds, tm);
180c92c4 AB	90
ab62670e	91	return 0;
dc59ed38 LD	92	}
	93
	94	static int tps6586x_rtc_set_time(struct device dev, struct rtc_time tm)
	95	{
dc59ed38 LD	96	struct device *tps_dev = to_tps6586x_dev(dev);
dc59ed38 LD	97	unsigned long long ticks;
7982df86	98	time64_t seconds;
dc59ed38 LD	99	u8 buff[5];
	100	int ret;
	101
7982df86	102	seconds = rtc_tm_to_time64(tm);
dc59ed38 LD	103
	104	ticks = (unsigned long long)seconds << 10;
	105	buff[0] = (ticks >> 32) & 0xff;
	106	buff[1] = (ticks >> 24) & 0xff;
	107	buff[2] = (ticks >> 16) & 0xff;
	108	buff[3] = (ticks >> 8) & 0xff;
	109	buff[4] = ticks & 0xff;
	110
	111	/* Disable RTC before changing time */
	112	ret = tps6586x_clr_bits(tps_dev, RTC_CTRL, RTC_ENABLE);
	113	if (ret < 0) {
	114	dev_err(dev, "failed to clear RTC_ENABLE\n");
	115	return ret;
	116	}
	117
	118	ret = tps6586x_writes(tps_dev, RTC_COUNT4, sizeof(buff), buff);
	119	if (ret < 0) {
	120	dev_err(dev, "failed to program new time\n");
	121	return ret;
	122	}
	123
	124	/* Enable RTC */
	125	ret = tps6586x_set_bits(tps_dev, RTC_CTRL, RTC_ENABLE);
	126	if (ret < 0) {
	127	dev_err(dev, "failed to set RTC_ENABLE\n");
	128	return ret;
	129	}
	130	return 0;
	131	}
	132
	133	static int tps6586x_rtc_alarm_irq_enable(struct device *dev,
	134	unsigned int enabled)
	135	{
	136	struct tps6586x_rtc *rtc = dev_get_drvdata(dev);
	137
	138	if (enabled && !rtc->irq_en) {
	139	enable_irq(rtc->irq);
	140	rtc->irq_en = true;
	141	} else if (!enabled && rtc->irq_en) {
	142	disable_irq(rtc->irq);
	143	rtc->irq_en = false;
	144	}
	145	return 0;
	146	}
	147
	148	static int tps6586x_rtc_set_alarm(struct device dev, struct rtc_wkalrm alrm)
	149	{
dc59ed38	150	struct device *tps_dev = to_tps6586x_dev(dev);
7982df86	151	time64_t seconds;
dc59ed38 LD	152	unsigned long ticks;
	153	unsigned long rtc_current_time;
	154	unsigned long long rticks = 0;
	155	u8 buff[3];
	156	u8 rbuff[6];
	157	int ret;
	158	int i;
	159
7982df86	160	seconds = rtc_tm_to_time64(&alrm->time);
dc59ed38	161
dc59ed38 LD	162	ret = tps6586x_rtc_alarm_irq_enable(dev, alrm->enabled);
	163	if (ret < 0) {
	164	dev_err(dev, "can't set alarm irq, err %d\n", ret);
	165	return ret;
	166	}
	167
dc59ed38 LD	168	ret = tps6586x_reads(tps_dev, RTC_COUNT4_DUMMYREAD,
	169	sizeof(rbuff), rbuff);
	170	if (ret < 0) {
	171	dev_err(dev, "read counter failed with err %d\n", ret);
	172	return ret;
	173	}
	174
	175	for (i = 1; i < sizeof(rbuff); i++) {
	176	rticks <<= 8;
	177	rticks \|= rbuff[i];
	178	}
	179
	180	rtc_current_time = rticks >> 10;
	181	if ((seconds - rtc_current_time) > ALM1_VALID_RANGE_IN_SEC)
	182	seconds = rtc_current_time - 1;
	183
	184	ticks = (unsigned long long)seconds << 10;
	185	buff[0] = (ticks >> 16) & 0xff;
	186	buff[1] = (ticks >> 8) & 0xff;
	187	buff[2] = ticks & 0xff;
	188
	189	ret = tps6586x_writes(tps_dev, RTC_ALARM1_HI, sizeof(buff), buff);
	190	if (ret)
	191	dev_err(dev, "programming alarm failed with err %d\n", ret);
	192
	193	return ret;
	194	}
	195
	196	static int tps6586x_rtc_read_alarm(struct device dev, struct rtc_wkalrm alrm)
	197	{
dc59ed38 LD	198	struct device *tps_dev = to_tps6586x_dev(dev);
dc59ed38 LD	199	unsigned long ticks;
7982df86	200	time64_t seconds;
dc59ed38 LD	201	u8 buff[3];
	202	int ret;
	203
	204	ret = tps6586x_reads(tps_dev, RTC_ALARM1_HI, sizeof(buff), buff);
	205	if (ret) {
	206	dev_err(dev, "read RTC_ALARM1_HI failed with err %d\n", ret);
	207	return ret;
	208	}
	209
	210	ticks = (buff[0] << 16) \| (buff[1] << 8) \| buff[2];
	211	seconds = ticks >> 10;
dc59ed38	212
7982df86	213	rtc_time64_to_tm(seconds, &alrm->time);
dc59ed38 LD	214	return 0;
	215	}
	216
	217	static const struct rtc_class_ops tps6586x_rtc_ops = {
	218	.read_time = tps6586x_rtc_read_time,
	219	.set_time = tps6586x_rtc_set_time,
	220	.set_alarm = tps6586x_rtc_set_alarm,
	221	.read_alarm = tps6586x_rtc_read_alarm,
	222	.alarm_irq_enable = tps6586x_rtc_alarm_irq_enable,
	223	};
	224
	225	static irqreturn_t tps6586x_rtc_irq(int irq, void *data)
	226	{
	227	struct tps6586x_rtc *rtc = data;
	228
	229	rtc_update_irq(rtc->rtc, 1, RTC_IRQF \| RTC_AF);
	230	return IRQ_HANDLED;
	231	}
	232
	233	static int tps6586x_rtc_probe(struct platform_device *pdev)
	234	{
	235	struct device *tps_dev = to_tps6586x_dev(&pdev->dev);
	236	struct tps6586x_rtc *rtc;
	237	int ret;
	238
	239	rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL);
	240	if (!rtc)
	241	return -ENOMEM;
	242
	243	rtc->dev = &pdev->dev;
	244	rtc->irq = platform_get_irq(pdev, 0);
	245
dc59ed38 LD	246	/* 1 kHz tick mode, enable tick counting */
	247	ret = tps6586x_update(tps_dev, RTC_CTRL,
	248	RTC_ENABLE \| OSC_SRC_SEL \|
	249	((TPS6586X_RTC_CL_SEL_1_5PF << CL_SEL_POS) & CL_SEL_MASK),
	250	RTC_ENABLE \| OSC_SRC_SEL \| PRE_BYPASS \| CL_SEL_MASK);
	251	if (ret < 0) {
	252	dev_err(&pdev->dev, "unable to start counter\n");
	253	return ret;
	254	}
	255
5a280844 DO	256	device_init_wakeup(&pdev->dev, 1);
5a280844 DO	257
dc59ed38	258	platform_set_drvdata(pdev, rtc);
63d22063	259	rtc->rtc = devm_rtc_allocate_device(&pdev->dev);
dc59ed38 LD	260	if (IS_ERR(rtc->rtc)) {
dc59ed38 LD	261	ret = PTR_ERR(rtc->rtc);
63d22063	262	dev_err(&pdev->dev, "RTC allocate device: ret %d\n", ret);
dc59ed38 LD	263	goto fail_rtc_register;
	264	}
	265
63d22063	266	rtc->rtc->ops = &tps6586x_rtc_ops;
180c92c4 AB	267	rtc->rtc->range_max = (1ULL << 30) - 1; /* 30-bit seconds */
	268	rtc->rtc->start_secs = mktime64(2009, 1, 1, 0, 0, 0);
	269	rtc->rtc->set_start_time = true;
63d22063	270
190ab4af JH	271	ret = devm_request_threaded_irq(&pdev->dev, rtc->irq, NULL,
190ab4af JH	272	tps6586x_rtc_irq,
aa1e8069	273	IRQF_ONESHOT,
dc59ed38 LD	274	dev_name(&pdev->dev), rtc);
	275	if (ret < 0) {
	276	dev_err(&pdev->dev, "request IRQ(%d) failed with ret %d\n",
	277	rtc->irq, ret);
ad3f3cf4	278	goto fail_rtc_register;
dc59ed38 LD	279	}
dc59ed38 LD	280	disable_irq(rtc->irq);
63d22063 AB	281
	282	ret = rtc_register_device(rtc->rtc);
	283	if (ret) {
	284	dev_err(&pdev->dev, "RTC device register: ret %d\n", ret);
	285	goto fail_rtc_register;
	286	}
	287
dc59ed38 LD	288	return 0;
dc59ed38 LD	289
dc59ed38 LD	290	fail_rtc_register:
	291	tps6586x_update(tps_dev, RTC_CTRL, 0,
	292	RTC_ENABLE \| OSC_SRC_SEL \| PRE_BYPASS \| CL_SEL_MASK);
	293	return ret;
	294	};
	295
	296	static int tps6586x_rtc_remove(struct platform_device *pdev)
	297	{
dc59ed38 LD	298	struct device *tps_dev = to_tps6586x_dev(&pdev->dev);
	299
	300	tps6586x_update(tps_dev, RTC_CTRL, 0,
	301	RTC_ENABLE \| OSC_SRC_SEL \| PRE_BYPASS \| CL_SEL_MASK);
dc59ed38 LD	302	return 0;
	303	}
	304
	305	#ifdef CONFIG_PM_SLEEP
	306	static int tps6586x_rtc_suspend(struct device *dev)
	307	{
	308	struct tps6586x_rtc *rtc = dev_get_drvdata(dev);
	309
	310	if (device_may_wakeup(dev))
	311	enable_irq_wake(rtc->irq);
	312	return 0;
	313	}
	314
	315	static int tps6586x_rtc_resume(struct device *dev)
	316	{
	317	struct tps6586x_rtc *rtc = dev_get_drvdata(dev);
	318
	319	if (device_may_wakeup(dev))
	320	disable_irq_wake(rtc->irq);
	321	return 0;
	322	}
	323	#endif
	324
8070d053 JH	325	static SIMPLE_DEV_PM_OPS(tps6586x_pm_ops, tps6586x_rtc_suspend,
8070d053 JH	326	tps6586x_rtc_resume);
dc59ed38 LD	327
	328	static struct platform_driver tps6586x_rtc_driver = {
	329	.driver = {
	330	.name = "tps6586x-rtc",
dc59ed38 LD	331	.pm = &tps6586x_pm_ops,
	332	},
	333	.probe = tps6586x_rtc_probe,
	334	.remove = tps6586x_rtc_remove,
	335	};
	336	module_platform_driver(tps6586x_rtc_driver);
	337
b9ba1eb0	338	MODULE_ALIAS("platform:tps6586x-rtc");
dc59ed38 LD	339	MODULE_DESCRIPTION("TI TPS6586x RTC driver");
	340	MODULE_AUTHOR("Laxman dewangan <ldewangan@nvidia.com>");
	341	MODULE_LICENSE("GPL v2");