[mirror_ubuntu-bionic-kernel.git] / drivers / rtc / rtc-as3722.c

/*
 * rtc-as3722.c - Real Time Clock driver for ams AS3722 PMICs
 *
 * Copyright (C) 2013 ams AG
 * Copyright (c) 2013, NVIDIA Corporation. All rights reserved.
 *
 * Author: Florian Lobmaier <florian.lobmaier@ams.com>
 * 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; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/bcd.h>
#include <linux/completion.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/ioctl.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mfd/as3722.h>
#include <linux/platform_device.h>
#include <linux/rtc.h>
#include <linux/time.h>

#define AS3722_RTC_START_YEAR	  2000
struct as3722_rtc {
	struct rtc_device	*rtc;
	struct device		*dev;
	struct as3722		*as3722;
	int			alarm_irq;
	bool			irq_enable;
};

static void as3722_time_to_reg(u8 *rbuff, struct rtc_time *tm)
{
	rbuff[0] = bin2bcd(tm->tm_sec);
	rbuff[1] = bin2bcd(tm->tm_min);
	rbuff[2] = bin2bcd(tm->tm_hour);
	rbuff[3] = bin2bcd(tm->tm_mday);
	rbuff[4] = bin2bcd(tm->tm_mon + 1);
	rbuff[5] = bin2bcd(tm->tm_year - (AS3722_RTC_START_YEAR - 1900));
}

static void as3722_reg_to_time(u8 *rbuff, struct rtc_time *tm)
{
	tm->tm_sec = bcd2bin(rbuff[0] & 0x7F);
	tm->tm_min = bcd2bin(rbuff[1] & 0x7F);
	tm->tm_hour = bcd2bin(rbuff[2] & 0x3F);
	tm->tm_mday = bcd2bin(rbuff[3] & 0x3F);
	tm->tm_mon = bcd2bin(rbuff[4] & 0x1F) - 1;
	tm->tm_year = (AS3722_RTC_START_YEAR - 1900) + bcd2bin(rbuff[5] & 0x7F);
	return;
}

static int as3722_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
	struct as3722_rtc *as3722_rtc = dev_get_drvdata(dev);
	struct as3722 *as3722 = as3722_rtc->as3722;
	u8 as_time_array[6];
	int ret;

	ret = as3722_block_read(as3722, AS3722_RTC_SECOND_REG,
			6, as_time_array);
	if (ret < 0) {
		dev_err(dev, "RTC_SECOND reg block read failed %d\n", ret);
		return ret;
	}
	as3722_reg_to_time(as_time_array, tm);
	return 0;
}

static int as3722_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
	struct as3722_rtc *as3722_rtc = dev_get_drvdata(dev);
	struct as3722 *as3722 = as3722_rtc->as3722;
	u8 as_time_array[6];
	int ret;

	if (tm->tm_year < (AS3722_RTC_START_YEAR - 1900))
		return -EINVAL;

	as3722_time_to_reg(as_time_array, tm);
	ret = as3722_block_write(as3722, AS3722_RTC_SECOND_REG, 6,
			as_time_array);
	if (ret < 0)
		dev_err(dev, "RTC_SECOND reg block write failed %d\n", ret);
	return ret;
}

static int as3722_rtc_alarm_irq_enable(struct device *dev,
		unsigned int enabled)
{
	struct as3722_rtc *as3722_rtc = dev_get_drvdata(dev);

	if (enabled && !as3722_rtc->irq_enable) {
		enable_irq(as3722_rtc->alarm_irq);
		as3722_rtc->irq_enable = true;
	} else if (!enabled && as3722_rtc->irq_enable)  {
		disable_irq(as3722_rtc->alarm_irq);
		as3722_rtc->irq_enable = false;
	}
	return 0;
}

static int as3722_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
	struct as3722_rtc *as3722_rtc = dev_get_drvdata(dev);
	struct as3722 *as3722 = as3722_rtc->as3722;
	u8 as_time_array[6];
	int ret;

	ret = as3722_block_read(as3722, AS3722_RTC_ALARM_SECOND_REG, 6,
			as_time_array);
	if (ret < 0) {
		dev_err(dev, "RTC_ALARM_SECOND block read failed %d\n", ret);
		return ret;
	}

	as3722_reg_to_time(as_time_array, &alrm->time);
	return 0;
}

static int as3722_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
	struct as3722_rtc *as3722_rtc = dev_get_drvdata(dev);
	struct as3722 *as3722 = as3722_rtc->as3722;
	u8 as_time_array[6];
	int ret;

	if (alrm->time.tm_year < (AS3722_RTC_START_YEAR - 1900))
		return -EINVAL;

	ret = as3722_rtc_alarm_irq_enable(dev, 0);
	if (ret < 0) {
		dev_err(dev, "Disable RTC alarm failed\n");
		return ret;
	}

	as3722_time_to_reg(as_time_array, &alrm->time);
	ret = as3722_block_write(as3722, AS3722_RTC_ALARM_SECOND_REG, 6,
			as_time_array);
	if (ret < 0) {
		dev_err(dev, "RTC_ALARM_SECOND block write failed %d\n", ret);
		return ret;
	}

	if (alrm->enabled)
		ret = as3722_rtc_alarm_irq_enable(dev, alrm->enabled);
	return ret;
}

static irqreturn_t as3722_alarm_irq(int irq, void *data)
{
	struct as3722_rtc *as3722_rtc = data;

	rtc_update_irq(as3722_rtc->rtc, 1, RTC_IRQF | RTC_AF);
	return IRQ_HANDLED;
}

static const struct rtc_class_ops as3722_rtc_ops = {
	.read_time = as3722_rtc_read_time,
	.set_time = as3722_rtc_set_time,
	.read_alarm = as3722_rtc_read_alarm,
	.set_alarm = as3722_rtc_set_alarm,
	.alarm_irq_enable = as3722_rtc_alarm_irq_enable,
};

static int as3722_rtc_probe(struct platform_device *pdev)
{
	struct as3722 *as3722 = dev_get_drvdata(pdev->dev.parent);
	struct as3722_rtc *as3722_rtc;
	int ret;

	as3722_rtc = devm_kzalloc(&pdev->dev, sizeof(*as3722_rtc), GFP_KERNEL);
	if (!as3722_rtc)
		return -ENOMEM;

	as3722_rtc->as3722 = as3722;
	as3722_rtc->dev = &pdev->dev;
	platform_set_drvdata(pdev, as3722_rtc);

	/* Enable the RTC to make sure it is running. */
	ret = as3722_update_bits(as3722, AS3722_RTC_CONTROL_REG,
			AS3722_RTC_ON | AS3722_RTC_ALARM_WAKEUP_EN,
			AS3722_RTC_ON | AS3722_RTC_ALARM_WAKEUP_EN);
	if (ret < 0) {
		dev_err(&pdev->dev, "RTC_CONTROL reg write failed: %d\n", ret);
		return ret;
	}

	device_init_wakeup(&pdev->dev, 1);

	as3722_rtc->rtc = devm_rtc_device_register(&pdev->dev, "as3722-rtc",
				&as3722_rtc_ops, THIS_MODULE);
	if (IS_ERR(as3722_rtc->rtc)) {
		ret = PTR_ERR(as3722_rtc->rtc);
		dev_err(&pdev->dev, "RTC register failed: %d\n", ret);
		return ret;
	}

	as3722_rtc->alarm_irq = platform_get_irq(pdev, 0);
	dev_info(&pdev->dev, "RTC interrupt %d\n", as3722_rtc->alarm_irq);

	ret = devm_request_threaded_irq(&pdev->dev, as3722_rtc->alarm_irq, NULL,
			as3722_alarm_irq, IRQF_ONESHOT,
			"rtc-alarm", as3722_rtc);
	if (ret < 0) {
		dev_err(&pdev->dev, "Failed to request alarm IRQ %d: %d\n",
				as3722_rtc->alarm_irq, ret);
		return ret;
	}
	disable_irq(as3722_rtc->alarm_irq);
	return 0;
}

#ifdef CONFIG_PM_SLEEP
static int as3722_rtc_suspend(struct device *dev)
{
	struct as3722_rtc *as3722_rtc = dev_get_drvdata(dev);

	if (device_may_wakeup(dev))
		enable_irq_wake(as3722_rtc->alarm_irq);

	return 0;
}

static int as3722_rtc_resume(struct device *dev)
{
	struct as3722_rtc *as3722_rtc = dev_get_drvdata(dev);

	if (device_may_wakeup(dev))
		disable_irq_wake(as3722_rtc->alarm_irq);
	return 0;
}
#endif

static SIMPLE_DEV_PM_OPS(as3722_rtc_pm_ops, as3722_rtc_suspend,
			 as3722_rtc_resume);

static struct platform_driver as3722_rtc_driver = {
	.probe = as3722_rtc_probe,
	.driver = {
		.name = "as3722-rtc",
		.pm = &as3722_rtc_pm_ops,
	},
};
module_platform_driver(as3722_rtc_driver);

MODULE_DESCRIPTION("RTC driver for AS3722 PMICs");
MODULE_ALIAS("platform:as3722-rtc");
MODULE_AUTHOR("Florian Lobmaier <florian.lobmaier@ams.com>");
MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
MODULE_LICENSE("GPL");
Commit	Line	Data
b4506261 LD	1	/*
	2	* rtc-as3722.c - Real Time Clock driver for ams AS3722 PMICs
	3	*
	4	* Copyright (C) 2013 ams AG
	5	* Copyright (c) 2013, NVIDIA Corporation. All rights reserved.
	6	*
	7	* Author: Florian Lobmaier <florian.lobmaier@ams.com>
	8	* Author: Laxman Dewangan <ldewangan@nvidia.com>
	9	*
	10	* This program is free software; you can redistribute it and/or modify
	11	* it under the terms of the GNU General Public License as published by
	12	* the Free Software Foundation; either version 2 of the License, or
	13	* (at your option) any later version.
	14	*
	15	* This program is distributed in the hope that it will be useful,
	16	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	17	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	18	* GNU General Public License for more details.
	19	*/
	20
	21	#include <linux/bcd.h>
	22	#include <linux/completion.h>
	23	#include <linux/delay.h>
	24	#include <linux/interrupt.h>
	25	#include <linux/ioctl.h>
	26	#include <linux/kernel.h>
	27	#include <linux/module.h>
	28	#include <linux/mfd/as3722.h>
	29	#include <linux/platform_device.h>
	30	#include <linux/rtc.h>
	31	#include <linux/time.h>
	32
	33	#define AS3722_RTC_START_YEAR 2000
	34	struct as3722_rtc {
	35	struct rtc_device *rtc;
	36	struct device *dev;
	37	struct as3722 *as3722;
	38	int alarm_irq;
	39	bool irq_enable;
	40	};
	41
	42	static void as3722_time_to_reg(u8 rbuff, struct rtc_time tm)
	43	{
	44	rbuff[0] = bin2bcd(tm->tm_sec);
	45	rbuff[1] = bin2bcd(tm->tm_min);
	46	rbuff[2] = bin2bcd(tm->tm_hour);
	47	rbuff[3] = bin2bcd(tm->tm_mday);
a038c3aa	48	rbuff[4] = bin2bcd(tm->tm_mon + 1);
b4506261 LD	49	rbuff[5] = bin2bcd(tm->tm_year - (AS3722_RTC_START_YEAR - 1900));
	50	}
	51
	52	static void as3722_reg_to_time(u8 rbuff, struct rtc_time tm)
	53	{
	54	tm->tm_sec = bcd2bin(rbuff[0] & 0x7F);
	55	tm->tm_min = bcd2bin(rbuff[1] & 0x7F);
	56	tm->tm_hour = bcd2bin(rbuff[2] & 0x3F);
	57	tm->tm_mday = bcd2bin(rbuff[3] & 0x3F);
a038c3aa	58	tm->tm_mon = bcd2bin(rbuff[4] & 0x1F) - 1;
b4506261 LD	59	tm->tm_year = (AS3722_RTC_START_YEAR - 1900) + bcd2bin(rbuff[5] & 0x7F);
	60	return;
	61	}
	62
	63	static int as3722_rtc_read_time(struct device dev, struct rtc_time tm)
	64	{
	65	struct as3722_rtc *as3722_rtc = dev_get_drvdata(dev);
	66	struct as3722 *as3722 = as3722_rtc->as3722;
	67	u8 as_time_array[6];
	68	int ret;
	69
	70	ret = as3722_block_read(as3722, AS3722_RTC_SECOND_REG,
	71	6, as_time_array);
	72	if (ret < 0) {
	73	dev_err(dev, "RTC_SECOND reg block read failed %d\n", ret);
	74	return ret;
	75	}
	76	as3722_reg_to_time(as_time_array, tm);
	77	return 0;
	78	}
	79
	80	static int as3722_rtc_set_time(struct device dev, struct rtc_time tm)
	81	{
	82	struct as3722_rtc *as3722_rtc = dev_get_drvdata(dev);
	83	struct as3722 *as3722 = as3722_rtc->as3722;
	84	u8 as_time_array[6];
	85	int ret;
	86
	87	if (tm->tm_year < (AS3722_RTC_START_YEAR - 1900))
	88	return -EINVAL;
	89
	90	as3722_time_to_reg(as_time_array, tm);
	91	ret = as3722_block_write(as3722, AS3722_RTC_SECOND_REG, 6,
	92	as_time_array);
	93	if (ret < 0)
	94	dev_err(dev, "RTC_SECOND reg block write failed %d\n", ret);
	95	return ret;
	96	}
	97
	98	static int as3722_rtc_alarm_irq_enable(struct device *dev,
	99	unsigned int enabled)
	100	{
	101	struct as3722_rtc *as3722_rtc = dev_get_drvdata(dev);
	102
	103	if (enabled && !as3722_rtc->irq_enable) {
	104	enable_irq(as3722_rtc->alarm_irq);
	105	as3722_rtc->irq_enable = true;
	106	} else if (!enabled && as3722_rtc->irq_enable) {
	107	disable_irq(as3722_rtc->alarm_irq);
	108	as3722_rtc->irq_enable = false;
	109	}
	110	return 0;
	111	}
	112
	113	static int as3722_rtc_read_alarm(struct device dev, struct rtc_wkalrm alrm)
	114	{
	115	struct as3722_rtc *as3722_rtc = dev_get_drvdata(dev);
	116	struct as3722 *as3722 = as3722_rtc->as3722;
	117	u8 as_time_array[6];
	118	int ret;
	119
	120	ret = as3722_block_read(as3722, AS3722_RTC_ALARM_SECOND_REG, 6,
	121	as_time_array);
	122	if (ret < 0) {
123	dev_err(dev, "RTC_ALARM_SECOND block read failed %d\n", ret);
124	return ret;
125	}
126
127	as3722_reg_to_time(as_time_array, &alrm->time);
128	return 0;
129	}
130
131	static int as3722_rtc_set_alarm(struct device dev, struct rtc_wkalrm alrm)
132	{
133	struct as3722_rtc *as3722_rtc = dev_get_drvdata(dev);
134	struct as3722 *as3722 = as3722_rtc->as3722;
135	u8 as_time_array[6];
136	int ret;
137
138	if (alrm->time.tm_year < (AS3722_RTC_START_YEAR - 1900))
139	return -EINVAL;
140
141	ret = as3722_rtc_alarm_irq_enable(dev, 0);
142	if (ret < 0) {
143	dev_err(dev, "Disable RTC alarm failed\n");
144	return ret;
145	}
146
147	as3722_time_to_reg(as_time_array, &alrm->time);
148	ret = as3722_block_write(as3722, AS3722_RTC_ALARM_SECOND_REG, 6,
149	as_time_array);
150	if (ret < 0) {
151	dev_err(dev, "RTC_ALARM_SECOND block write failed %d\n", ret);
152	return ret;
153	}
154
155	if (alrm->enabled)
156	ret = as3722_rtc_alarm_irq_enable(dev, alrm->enabled);
157	return ret;
158	}
159
160	static irqreturn_t as3722_alarm_irq(int irq, void *data)
161	{
162	struct as3722_rtc *as3722_rtc = data;
163
164	rtc_update_irq(as3722_rtc->rtc, 1, RTC_IRQF \| RTC_AF);
165	return IRQ_HANDLED;
166	}
167
168	static const struct rtc_class_ops as3722_rtc_ops = {
169	.read_time = as3722_rtc_read_time,
170	.set_time = as3722_rtc_set_time,
171	.read_alarm = as3722_rtc_read_alarm,
172	.set_alarm = as3722_rtc_set_alarm,
173	.alarm_irq_enable = as3722_rtc_alarm_irq_enable,
174	};
175
176	static int as3722_rtc_probe(struct platform_device *pdev)
177	{
178	struct as3722 *as3722 = dev_get_drvdata(pdev->dev.parent);
179	struct as3722_rtc *as3722_rtc;
180	int ret;
181
182	as3722_rtc = devm_kzalloc(&pdev->dev, sizeof(*as3722_rtc), GFP_KERNEL);
183	if (!as3722_rtc)
184	return -ENOMEM;
185
186	as3722_rtc->as3722 = as3722;
187	as3722_rtc->dev = &pdev->dev;
188	platform_set_drvdata(pdev, as3722_rtc);
189
190	/* Enable the RTC to make sure it is running. */
191	ret = as3722_update_bits(as3722, AS3722_RTC_CONTROL_REG,
192	AS3722_RTC_ON \| AS3722_RTC_ALARM_WAKEUP_EN,
193	AS3722_RTC_ON \| AS3722_RTC_ALARM_WAKEUP_EN);
194	if (ret < 0) {
195	dev_err(&pdev->dev, "RTC_CONTROL reg write failed: %d\n", ret);
196	return ret;
197	}
198
199	device_init_wakeup(&pdev->dev, 1);
200
75465c49	201	as3722_rtc->rtc = devm_rtc_device_register(&pdev->dev, "as3722-rtc",
b4506261 LD	202	&as3722_rtc_ops, THIS_MODULE);
	203	if (IS_ERR(as3722_rtc->rtc)) {
	204	ret = PTR_ERR(as3722_rtc->rtc);
	205	dev_err(&pdev->dev, "RTC register failed: %d\n", ret);
	206	return ret;
	207	}
	208
	209	as3722_rtc->alarm_irq = platform_get_irq(pdev, 0);
	210	dev_info(&pdev->dev, "RTC interrupt %d\n", as3722_rtc->alarm_irq);
	211
75465c49	212	ret = devm_request_threaded_irq(&pdev->dev, as3722_rtc->alarm_irq, NULL,
ddf7059c	213	as3722_alarm_irq, IRQF_ONESHOT,
b4506261 LD	214	"rtc-alarm", as3722_rtc);
	215	if (ret < 0) {
	216	dev_err(&pdev->dev, "Failed to request alarm IRQ %d: %d\n",
	217	as3722_rtc->alarm_irq, ret);
75465c49	218	return ret;
b4506261 LD	219	}
	220	disable_irq(as3722_rtc->alarm_irq);
	221	return 0;
b4506261 LD	222	}
	223
	224	#ifdef CONFIG_PM_SLEEP
	225	static int as3722_rtc_suspend(struct device *dev)
	226	{
	227	struct as3722_rtc *as3722_rtc = dev_get_drvdata(dev);
	228
	229	if (device_may_wakeup(dev))
	230	enable_irq_wake(as3722_rtc->alarm_irq);
	231
	232	return 0;
	233	}
	234
	235	static int as3722_rtc_resume(struct device *dev)
	236	{
	237	struct as3722_rtc *as3722_rtc = dev_get_drvdata(dev);
	238
	239	if (device_may_wakeup(dev))
	240	disable_irq_wake(as3722_rtc->alarm_irq);
	241	return 0;
	242	}
	243	#endif
	244
d55255cb JH	245	static SIMPLE_DEV_PM_OPS(as3722_rtc_pm_ops, as3722_rtc_suspend,
d55255cb JH	246	as3722_rtc_resume);
b4506261 LD	247
	248	static struct platform_driver as3722_rtc_driver = {
	249	.probe = as3722_rtc_probe,
b4506261 LD	250	.driver = {
	251	.name = "as3722-rtc",
	252	.pm = &as3722_rtc_pm_ops,
	253	},
	254	};
	255	module_platform_driver(as3722_rtc_driver);
	256
	257	MODULE_DESCRIPTION("RTC driver for AS3722 PMICs");
	258	MODULE_ALIAS("platform:as3722-rtc");
	259	MODULE_AUTHOR("Florian Lobmaier <florian.lobmaier@ams.com>");
	260	MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
	261	MODULE_LICENSE("GPL");