[deliverable/linux.git] / drivers / rtc / rtc-da9052.c

/*
 * Real time clock driver for DA9052
 *
 * Copyright(c) 2012 Dialog Semiconductor Ltd.
 *
 * Author: Dajun Dajun Chen <dajun.chen@diasemi.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; either version 2 of the License, or
 * (at your option) any later version.
 *
 */

#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/rtc.h>
#include <linux/err.h>

#include <linux/mfd/da9052/da9052.h>
#include <linux/mfd/da9052/reg.h>

#define rtc_err(rtc, fmt, ...) \
		dev_err(rtc->da9052->dev, "%s: " fmt, __func__, ##__VA_ARGS__)

struct da9052_rtc {
	struct rtc_device *rtc;
	struct da9052 *da9052;
};

static int da9052_rtc_enable_alarm(struct da9052_rtc *rtc, bool enable)
{
	int ret;
	if (enable) {
		ret = da9052_reg_update(rtc->da9052, DA9052_ALARM_Y_REG,
				DA9052_ALARM_Y_ALARM_ON|DA9052_ALARM_Y_TICK_ON,
				DA9052_ALARM_Y_ALARM_ON);
		if (ret != 0)
			rtc_err(rtc, "Failed to enable ALM: %d\n", ret);
	} else {
		ret = da9052_reg_update(rtc->da9052, DA9052_ALARM_Y_REG,
			DA9052_ALARM_Y_ALARM_ON|DA9052_ALARM_Y_TICK_ON, 0);
		if (ret != 0)
			rtc_err(rtc, "Write error: %d\n", ret);
	}
	return ret;
}

static irqreturn_t da9052_rtc_irq(int irq, void *data)
{
	struct da9052_rtc *rtc = data;

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

	return IRQ_HANDLED;
}

static int da9052_read_alarm(struct da9052_rtc *rtc, struct rtc_time *rtc_tm)
{
	int ret;
	uint8_t v[5];

	ret = da9052_group_read(rtc->da9052, DA9052_ALARM_MI_REG, 5, v);
	if (ret != 0) {
		rtc_err(rtc, "Failed to group read ALM: %d\n", ret);
		return ret;
	}

	rtc_tm->tm_year = (v[4] & DA9052_RTC_YEAR) + 100;
	rtc_tm->tm_mon  = (v[3] & DA9052_RTC_MONTH) - 1;
	rtc_tm->tm_mday = v[2] & DA9052_RTC_DAY;
	rtc_tm->tm_hour = v[1] & DA9052_RTC_HOUR;
	rtc_tm->tm_min  = v[0] & DA9052_RTC_MIN;

	ret = rtc_valid_tm(rtc_tm);
	return ret;
}

static int da9052_set_alarm(struct da9052_rtc *rtc, struct rtc_time *rtc_tm)
{
	struct da9052 *da9052 = rtc->da9052;
	unsigned long alm_time;
	int ret;
	uint8_t v[3];

	ret = rtc_tm_to_time(rtc_tm, &alm_time);
	if (ret != 0)
		return ret;

	if (rtc_tm->tm_sec > 0) {
		alm_time += 60 - rtc_tm->tm_sec;
		rtc_time_to_tm(alm_time, rtc_tm);
	}
	BUG_ON(rtc_tm->tm_sec); /* it will cause repeated irqs if not zero */

	rtc_tm->tm_year -= 100;
	rtc_tm->tm_mon += 1;

	ret = da9052_reg_update(da9052, DA9052_ALARM_MI_REG,
				DA9052_RTC_MIN, rtc_tm->tm_min);
	if (ret != 0) {
		rtc_err(rtc, "Failed to write ALRM MIN: %d\n", ret);
		return ret;
	}

	v[0] = rtc_tm->tm_hour;
	v[1] = rtc_tm->tm_mday;
	v[2] = rtc_tm->tm_mon;

	ret = da9052_group_write(da9052, DA9052_ALARM_H_REG, 3, v);
	if (ret < 0)
		return ret;

	ret = da9052_reg_update(da9052, DA9052_ALARM_Y_REG,
				DA9052_RTC_YEAR, rtc_tm->tm_year);
	if (ret != 0)
		rtc_err(rtc, "Failed to write ALRM YEAR: %d\n", ret);

	return ret;
}

static int da9052_rtc_get_alarm_status(struct da9052_rtc *rtc)
{
	int ret;

	ret = da9052_reg_read(rtc->da9052, DA9052_ALARM_Y_REG);
	if (ret < 0) {
		rtc_err(rtc, "Failed to read ALM: %d\n", ret);
		return ret;
	}

	return !!(ret&DA9052_ALARM_Y_ALARM_ON);
}

static int da9052_rtc_read_time(struct device *dev, struct rtc_time *rtc_tm)
{
	struct da9052_rtc *rtc = dev_get_drvdata(dev);
	uint8_t v[6];
	int ret;

	ret = da9052_group_read(rtc->da9052, DA9052_COUNT_S_REG, 6, v);
	if (ret < 0) {
		rtc_err(rtc, "Failed to read RTC time : %d\n", ret);
		return ret;
	}

	rtc_tm->tm_year = (v[5] & DA9052_RTC_YEAR) + 100;
	rtc_tm->tm_mon  = (v[4] & DA9052_RTC_MONTH) - 1;
	rtc_tm->tm_mday = v[3] & DA9052_RTC_DAY;
	rtc_tm->tm_hour = v[2] & DA9052_RTC_HOUR;
	rtc_tm->tm_min  = v[1] & DA9052_RTC_MIN;
	rtc_tm->tm_sec  = v[0] & DA9052_RTC_SEC;

	ret = rtc_valid_tm(rtc_tm);
	return ret;
}

static int da9052_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
	struct da9052_rtc *rtc;
	uint8_t v[6];
	int ret;

	rtc = dev_get_drvdata(dev);

	v[0] = tm->tm_sec;
	v[1] = tm->tm_min;
	v[2] = tm->tm_hour;
	v[3] = tm->tm_mday;
	v[4] = tm->tm_mon + 1;
	v[5] = tm->tm_year - 100;

	ret = da9052_group_write(rtc->da9052, DA9052_COUNT_S_REG, 6, v);
	if (ret < 0)
		rtc_err(rtc, "failed to set RTC time: %d\n", ret);
	return ret;
}

static int da9052_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
	int ret;
	struct rtc_time *tm = &alrm->time;
	struct da9052_rtc *rtc = dev_get_drvdata(dev);

	ret = da9052_read_alarm(rtc, tm);
	if (ret < 0) {
		rtc_err(rtc, "failed to read RTC alarm: %d\n", ret);
		return ret;
	}

	alrm->enabled = da9052_rtc_get_alarm_status(rtc);
	return 0;
}

static int da9052_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
	int ret;
	struct rtc_time *tm = &alrm->time;
	struct da9052_rtc *rtc = dev_get_drvdata(dev);

	ret = da9052_rtc_enable_alarm(rtc, 0);
	if (ret < 0)
		return ret;

	ret = da9052_set_alarm(rtc, tm);
	if (ret < 0)
		return ret;

	ret = da9052_rtc_enable_alarm(rtc, 1);
	return ret;
}

static int da9052_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
{
	struct da9052_rtc *rtc = dev_get_drvdata(dev);

	return da9052_rtc_enable_alarm(rtc, enabled);
}

static const struct rtc_class_ops da9052_rtc_ops = {
	.read_time	= da9052_rtc_read_time,
	.set_time	= da9052_rtc_set_time,
	.read_alarm	= da9052_rtc_read_alarm,
	.set_alarm	= da9052_rtc_set_alarm,
	.alarm_irq_enable = da9052_rtc_alarm_irq_enable,
};

static int da9052_rtc_probe(struct platform_device *pdev)
{
	struct da9052_rtc *rtc;
	int ret;

	rtc = devm_kzalloc(&pdev->dev, sizeof(struct da9052_rtc), GFP_KERNEL);
	if (!rtc)
		return -ENOMEM;

	rtc->da9052 = dev_get_drvdata(pdev->dev.parent);
	platform_set_drvdata(pdev, rtc);

	ret = da9052_reg_write(rtc->da9052, DA9052_BBAT_CONT_REG, 0xFE);
	if (ret < 0) {
		rtc_err(rtc,
			"Failed to setup RTC battery charging: %d\n", ret);
		return ret;
	}

	ret = da9052_reg_update(rtc->da9052, DA9052_ALARM_Y_REG,
				DA9052_ALARM_Y_TICK_ON, 0);
	if (ret != 0)
		rtc_err(rtc, "Failed to disable TICKS: %d\n", ret);

	ret = da9052_request_irq(rtc->da9052, DA9052_IRQ_ALARM, "ALM",
				da9052_rtc_irq, rtc);
	if (ret != 0) {
		rtc_err(rtc, "irq registration failed: %d\n", ret);
		return ret;
	}

	rtc->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
				       &da9052_rtc_ops, THIS_MODULE);
	return PTR_ERR_OR_ZERO(rtc->rtc);
}

static struct platform_driver da9052_rtc_driver = {
	.probe	= da9052_rtc_probe,
	.driver = {
		.name	= "da9052-rtc",
		.owner	= THIS_MODULE,
	},
};

module_platform_driver(da9052_rtc_driver);

MODULE_AUTHOR("Anthony Olech <Anthony.Olech@diasemi.com>");
MODULE_DESCRIPTION("RTC driver for Dialog DA9052 PMIC");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:da9052-rtc");
Commit	Line	Data
fef931ff AJ	1	/*
	2	* Real time clock driver for DA9052
	3	*
	4	* Copyright(c) 2012 Dialog Semiconductor Ltd.
	5	*
	6	* Author: Dajun Dajun Chen <dajun.chen@diasemi.com>
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License as published by
	10	* the Free Software Foundation; either version 2 of the License, or
	11	* (at your option) any later version.
	12	*
	13	*/
	14
	15	#include <linux/module.h>
	16	#include <linux/platform_device.h>
	17	#include <linux/rtc.h>
11f54d05	18	#include <linux/err.h>
fef931ff AJ	19
	20	#include <linux/mfd/da9052/da9052.h>
	21	#include <linux/mfd/da9052/reg.h>
	22
7c994c08 AO	23	#define rtc_err(rtc, fmt, ...) \
7c994c08 AO	24	dev_err(rtc->da9052->dev, "%s: " fmt, __func__, ##__VA_ARGS__)
fef931ff AJ	25
	26	struct da9052_rtc {
	27	struct rtc_device *rtc;
	28	struct da9052 *da9052;
fef931ff AJ	29	};
fef931ff AJ	30
7c994c08	31	static int da9052_rtc_enable_alarm(struct da9052_rtc *rtc, bool enable)
fef931ff AJ	32	{
	33	int ret;
	34	if (enable) {
7c994c08 AO	35	ret = da9052_reg_update(rtc->da9052, DA9052_ALARM_Y_REG,
	36	DA9052_ALARM_Y_ALARM_ON\|DA9052_ALARM_Y_TICK_ON,
	37	DA9052_ALARM_Y_ALARM_ON);
fef931ff	38	if (ret != 0)
7c994c08	39	rtc_err(rtc, "Failed to enable ALM: %d\n", ret);
fef931ff	40	} else {
7c994c08 AO	41	ret = da9052_reg_update(rtc->da9052, DA9052_ALARM_Y_REG,
7c994c08 AO	42	DA9052_ALARM_Y_ALARM_ON\|DA9052_ALARM_Y_TICK_ON, 0);
fef931ff	43	if (ret != 0)
7c994c08	44	rtc_err(rtc, "Write error: %d\n", ret);
fef931ff AJ	45	}
	46	return ret;
	47	}
	48
	49	static irqreturn_t da9052_rtc_irq(int irq, void *data)
	50	{
	51	struct da9052_rtc *rtc = data;
fef931ff	52
7c994c08	53	rtc_update_irq(rtc->rtc, 1, RTC_IRQF \| RTC_AF);
fef931ff AJ	54
	55	return IRQ_HANDLED;
	56	}
	57
7c994c08	58	static int da9052_read_alarm(struct da9052_rtc rtc, struct rtc_time rtc_tm)
fef931ff AJ	59	{
	60	int ret;
	61	uint8_t v[5];
	62
7c994c08	63	ret = da9052_group_read(rtc->da9052, DA9052_ALARM_MI_REG, 5, v);
fef931ff	64	if (ret != 0) {
7c994c08	65	rtc_err(rtc, "Failed to group read ALM: %d\n", ret);
fef931ff AJ	66	return ret;
	67	}
	68
	69	rtc_tm->tm_year = (v[4] & DA9052_RTC_YEAR) + 100;
	70	rtc_tm->tm_mon = (v[3] & DA9052_RTC_MONTH) - 1;
	71	rtc_tm->tm_mday = v[2] & DA9052_RTC_DAY;
	72	rtc_tm->tm_hour = v[1] & DA9052_RTC_HOUR;
	73	rtc_tm->tm_min = v[0] & DA9052_RTC_MIN;
	74
	75	ret = rtc_valid_tm(rtc_tm);
fef931ff AJ	76	return ret;
	77	}
	78
7c994c08	79	static int da9052_set_alarm(struct da9052_rtc rtc, struct rtc_time rtc_tm)
fef931ff	80	{
7c994c08 AO	81	struct da9052 *da9052 = rtc->da9052;
7c994c08 AO	82	unsigned long alm_time;
fef931ff AJ	83	int ret;
	84	uint8_t v[3];
	85
7c994c08 AO	86	ret = rtc_tm_to_time(rtc_tm, &alm_time);
	87	if (ret != 0)
	88	return ret;
	89
	90	if (rtc_tm->tm_sec > 0) {
	91	alm_time += 60 - rtc_tm->tm_sec;
	92	rtc_time_to_tm(alm_time, rtc_tm);
	93	}
	94	BUG_ON(rtc_tm->tm_sec); /* it will cause repeated irqs if not zero */
	95
fef931ff AJ	96	rtc_tm->tm_year -= 100;
	97	rtc_tm->tm_mon += 1;
	98
	99	ret = da9052_reg_update(da9052, DA9052_ALARM_MI_REG,
	100	DA9052_RTC_MIN, rtc_tm->tm_min);
	101	if (ret != 0) {
7c994c08	102	rtc_err(rtc, "Failed to write ALRM MIN: %d\n", ret);
fef931ff AJ	103	return ret;
	104	}
	105
	106	v[0] = rtc_tm->tm_hour;
	107	v[1] = rtc_tm->tm_mday;
	108	v[2] = rtc_tm->tm_mon;
	109
	110	ret = da9052_group_write(da9052, DA9052_ALARM_H_REG, 3, v);
	111	if (ret < 0)
	112	return ret;
	113
	114	ret = da9052_reg_update(da9052, DA9052_ALARM_Y_REG,
	115	DA9052_RTC_YEAR, rtc_tm->tm_year);
	116	if (ret != 0)
7c994c08	117	rtc_err(rtc, "Failed to write ALRM YEAR: %d\n", ret);
fef931ff AJ	118
	119	return ret;
	120	}
	121
7c994c08	122	static int da9052_rtc_get_alarm_status(struct da9052_rtc *rtc)
fef931ff AJ	123	{
	124	int ret;
	125
7c994c08	126	ret = da9052_reg_read(rtc->da9052, DA9052_ALARM_Y_REG);
fef931ff	127	if (ret < 0) {
7c994c08	128	rtc_err(rtc, "Failed to read ALM: %d\n", ret);
fef931ff AJ	129	return ret;
fef931ff AJ	130	}
7c994c08 AO	131
7c994c08 AO	132	return !!(ret&DA9052_ALARM_Y_ALARM_ON);
fef931ff AJ	133	}
	134
	135	static int da9052_rtc_read_time(struct device dev, struct rtc_time rtc_tm)
	136	{
	137	struct da9052_rtc *rtc = dev_get_drvdata(dev);
	138	uint8_t v[6];
	139	int ret;
	140
	141	ret = da9052_group_read(rtc->da9052, DA9052_COUNT_S_REG, 6, v);
	142	if (ret < 0) {
7c994c08	143	rtc_err(rtc, "Failed to read RTC time : %d\n", ret);
fef931ff AJ	144	return ret;
	145	}
	146
	147	rtc_tm->tm_year = (v[5] & DA9052_RTC_YEAR) + 100;
	148	rtc_tm->tm_mon = (v[4] & DA9052_RTC_MONTH) - 1;
	149	rtc_tm->tm_mday = v[3] & DA9052_RTC_DAY;
	150	rtc_tm->tm_hour = v[2] & DA9052_RTC_HOUR;
	151	rtc_tm->tm_min = v[1] & DA9052_RTC_MIN;
	152	rtc_tm->tm_sec = v[0] & DA9052_RTC_SEC;
	153
	154	ret = rtc_valid_tm(rtc_tm);
7c994c08	155	return ret;
fef931ff AJ	156	}
	157
	158	static int da9052_rtc_set_time(struct device dev, struct rtc_time tm)
	159	{
	160	struct da9052_rtc *rtc;
	161	uint8_t v[6];
7c994c08	162	int ret;
fef931ff AJ	163
	164	rtc = dev_get_drvdata(dev);
	165
	166	v[0] = tm->tm_sec;
	167	v[1] = tm->tm_min;
	168	v[2] = tm->tm_hour;
	169	v[3] = tm->tm_mday;
	170	v[4] = tm->tm_mon + 1;
	171	v[5] = tm->tm_year - 100;
	172
7c994c08 AO	173	ret = da9052_group_write(rtc->da9052, DA9052_COUNT_S_REG, 6, v);
	174	if (ret < 0)
	175	rtc_err(rtc, "failed to set RTC time: %d\n", ret);
	176	return ret;
fef931ff AJ	177	}
	178
	179	static int da9052_rtc_read_alarm(struct device dev, struct rtc_wkalrm alrm)
	180	{
	181	int ret;
	182	struct rtc_time *tm = &alrm->time;
	183	struct da9052_rtc *rtc = dev_get_drvdata(dev);
	184
7c994c08 AO	185	ret = da9052_read_alarm(rtc, tm);
	186	if (ret < 0) {
	187	rtc_err(rtc, "failed to read RTC alarm: %d\n", ret);
fef931ff	188	return ret;
7c994c08	189	}
fef931ff	190
7c994c08	191	alrm->enabled = da9052_rtc_get_alarm_status(rtc);
fef931ff AJ	192	return 0;
	193	}
	194
	195	static int da9052_rtc_set_alarm(struct device dev, struct rtc_wkalrm alrm)
	196	{
	197	int ret;
	198	struct rtc_time *tm = &alrm->time;
	199	struct da9052_rtc *rtc = dev_get_drvdata(dev);
	200
7c994c08	201	ret = da9052_rtc_enable_alarm(rtc, 0);
fef931ff AJ	202	if (ret < 0)
	203	return ret;
	204
7c994c08 AO	205	ret = da9052_set_alarm(rtc, tm);
7c994c08 AO	206	if (ret < 0)
fef931ff AJ	207	return ret;
fef931ff AJ	208
7c994c08	209	ret = da9052_rtc_enable_alarm(rtc, 1);
fef931ff AJ	210	return ret;
	211	}
	212
	213	static int da9052_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
	214	{
	215	struct da9052_rtc *rtc = dev_get_drvdata(dev);
	216
7c994c08	217	return da9052_rtc_enable_alarm(rtc, enabled);
fef931ff AJ	218	}
	219
	220	static const struct rtc_class_ops da9052_rtc_ops = {
	221	.read_time = da9052_rtc_read_time,
	222	.set_time = da9052_rtc_set_time,
	223	.read_alarm = da9052_rtc_read_alarm,
	224	.set_alarm = da9052_rtc_set_alarm,
	225	.alarm_irq_enable = da9052_rtc_alarm_irq_enable,
	226	};
	227
5a167f45	228	static int da9052_rtc_probe(struct platform_device *pdev)
fef931ff AJ	229	{
	230	struct da9052_rtc *rtc;
	231	int ret;
	232
	233	rtc = devm_kzalloc(&pdev->dev, sizeof(struct da9052_rtc), GFP_KERNEL);
	234	if (!rtc)
	235	return -ENOMEM;
	236
	237	rtc->da9052 = dev_get_drvdata(pdev->dev.parent);
	238	platform_set_drvdata(pdev, rtc);
7c994c08 AO	239
	240	ret = da9052_reg_write(rtc->da9052, DA9052_BBAT_CONT_REG, 0xFE);
	241	if (ret < 0) {
	242	rtc_err(rtc,
	243	"Failed to setup RTC battery charging: %d\n", ret);
	244	return ret;
	245	}
	246
	247	ret = da9052_reg_update(rtc->da9052, DA9052_ALARM_Y_REG,
	248	DA9052_ALARM_Y_TICK_ON, 0);
	249	if (ret != 0)
	250	rtc_err(rtc, "Failed to disable TICKS: %d\n", ret);
	251
c2c0eed7	252	ret = da9052_request_irq(rtc->da9052, DA9052_IRQ_ALARM, "ALM",
925e8ea6	253	da9052_rtc_irq, rtc);
fef931ff	254	if (ret != 0) {
7c994c08	255	rtc_err(rtc, "irq registration failed: %d\n", ret);
007def04	256	return ret;
fef931ff AJ	257	}
fef931ff AJ	258
3689cd74	259	rtc->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
fef931ff	260	&da9052_rtc_ops, THIS_MODULE);
dac30a98	261	return PTR_ERR_OR_ZERO(rtc->rtc);
fef931ff AJ	262	}
fef931ff AJ	263
fef931ff AJ	264	static struct platform_driver da9052_rtc_driver = {
fef931ff AJ	265	.probe = da9052_rtc_probe,
fef931ff AJ	266	.driver = {
	267	.name = "da9052-rtc",
	268	.owner = THIS_MODULE,
	269	},
	270	};
	271
	272	module_platform_driver(da9052_rtc_driver);
	273
7c994c08	274	MODULE_AUTHOR("Anthony Olech <Anthony.Olech@diasemi.com>");
fef931ff AJ	275	MODULE_DESCRIPTION("RTC driver for Dialog DA9052 PMIC");
	276	MODULE_LICENSE("GPL");
	277	MODULE_ALIAS("platform:da9052-rtc");