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

/*
 * rtc-palmas.c -- Palmas Real Time Clock driver.

 * RTC driver for TI Palma series devices like TPS65913,
 * TPS65914 power management IC.
 *
 * 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/bcd.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/mfd/palmas.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/rtc.h>
#include <linux/types.h>
#include <linux/platform_device.h>
#include <linux/pm.h>

struct palmas_rtc {
	struct rtc_device	*rtc;
	struct device		*dev;
	unsigned int		irq;
};

/* Total number of RTC registers needed to set time*/
#define PALMAS_NUM_TIME_REGS	(PALMAS_YEARS_REG - PALMAS_SECONDS_REG + 1)

static int palmas_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
	unsigned char rtc_data[PALMAS_NUM_TIME_REGS];
	struct palmas *palmas = dev_get_drvdata(dev->parent);
	int ret;

	/* Copy RTC counting registers to static registers or latches */
	ret = palmas_update_bits(palmas, PALMAS_RTC_BASE, PALMAS_RTC_CTRL_REG,
		PALMAS_RTC_CTRL_REG_GET_TIME, PALMAS_RTC_CTRL_REG_GET_TIME);
	if (ret < 0) {
		dev_err(dev, "RTC CTRL reg update failed, err: %d\n", ret);
		return ret;
	}

	ret = palmas_bulk_read(palmas, PALMAS_RTC_BASE, PALMAS_SECONDS_REG,
			rtc_data, PALMAS_NUM_TIME_REGS);
	if (ret < 0) {
		dev_err(dev, "RTC_SECONDS reg read failed, err = %d\n", ret);
		return ret;
	}

	tm->tm_sec = bcd2bin(rtc_data[0]);
	tm->tm_min = bcd2bin(rtc_data[1]);
	tm->tm_hour = bcd2bin(rtc_data[2]);
	tm->tm_mday = bcd2bin(rtc_data[3]);
	tm->tm_mon = bcd2bin(rtc_data[4]) - 1;
	tm->tm_year = bcd2bin(rtc_data[5]) + 100;

	return ret;
}

static int palmas_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
	unsigned char rtc_data[PALMAS_NUM_TIME_REGS];
	struct palmas *palmas = dev_get_drvdata(dev->parent);
	int ret;

	rtc_data[0] = bin2bcd(tm->tm_sec);
	rtc_data[1] = bin2bcd(tm->tm_min);
	rtc_data[2] = bin2bcd(tm->tm_hour);
	rtc_data[3] = bin2bcd(tm->tm_mday);
	rtc_data[4] = bin2bcd(tm->tm_mon + 1);
	rtc_data[5] = bin2bcd(tm->tm_year - 100);

	/* Stop RTC while updating the RTC time registers */
	ret = palmas_update_bits(palmas, PALMAS_RTC_BASE, PALMAS_RTC_CTRL_REG,
		PALMAS_RTC_CTRL_REG_STOP_RTC, 0);
	if (ret < 0) {
		dev_err(dev, "RTC stop failed, err = %d\n", ret);
		return ret;
	}

	ret = palmas_bulk_write(palmas, PALMAS_RTC_BASE, PALMAS_SECONDS_REG,
		rtc_data, PALMAS_NUM_TIME_REGS);
	if (ret < 0) {
		dev_err(dev, "RTC_SECONDS reg write failed, err = %d\n", ret);
		return ret;
	}

	/* Start back RTC */
	ret = palmas_update_bits(palmas, PALMAS_RTC_BASE, PALMAS_RTC_CTRL_REG,
		PALMAS_RTC_CTRL_REG_STOP_RTC, PALMAS_RTC_CTRL_REG_STOP_RTC);
	if (ret < 0)
		dev_err(dev, "RTC start failed, err = %d\n", ret);
	return ret;
}

static int palmas_rtc_alarm_irq_enable(struct device *dev, unsigned enabled)
{
	struct palmas *palmas = dev_get_drvdata(dev->parent);
	u8 val;

	val = enabled ? PALMAS_RTC_INTERRUPTS_REG_IT_ALARM : 0;
	return palmas_write(palmas, PALMAS_RTC_BASE,
		PALMAS_RTC_INTERRUPTS_REG, val);
}

static int palmas_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm)
{
	unsigned char alarm_data[PALMAS_NUM_TIME_REGS];
	u32 int_val;
	struct palmas *palmas = dev_get_drvdata(dev->parent);
	int ret;

	ret = palmas_bulk_read(palmas, PALMAS_RTC_BASE,
			PALMAS_ALARM_SECONDS_REG,
			alarm_data, PALMAS_NUM_TIME_REGS);
	if (ret < 0) {
		dev_err(dev, "RTC_ALARM_SECONDS read failed, err = %d\n", ret);
		return ret;
	}

	alm->time.tm_sec = bcd2bin(alarm_data[0]);
	alm->time.tm_min = bcd2bin(alarm_data[1]);
	alm->time.tm_hour = bcd2bin(alarm_data[2]);
	alm->time.tm_mday = bcd2bin(alarm_data[3]);
	alm->time.tm_mon = bcd2bin(alarm_data[4]) - 1;
	alm->time.tm_year = bcd2bin(alarm_data[5]) + 100;

	ret = palmas_read(palmas, PALMAS_RTC_BASE, PALMAS_RTC_INTERRUPTS_REG,
			&int_val);
	if (ret < 0) {
		dev_err(dev, "RTC_INTERRUPTS reg read failed, err = %d\n", ret);
		return ret;
	}

	if (int_val & PALMAS_RTC_INTERRUPTS_REG_IT_ALARM)
		alm->enabled = 1;
	return ret;
}

static int palmas_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
{
	unsigned char alarm_data[PALMAS_NUM_TIME_REGS];
	struct palmas *palmas = dev_get_drvdata(dev->parent);
	int ret;

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

	alarm_data[0] = bin2bcd(alm->time.tm_sec);
	alarm_data[1] = bin2bcd(alm->time.tm_min);
	alarm_data[2] = bin2bcd(alm->time.tm_hour);
	alarm_data[3] = bin2bcd(alm->time.tm_mday);
	alarm_data[4] = bin2bcd(alm->time.tm_mon + 1);
	alarm_data[5] = bin2bcd(alm->time.tm_year - 100);

	ret = palmas_bulk_write(palmas, PALMAS_RTC_BASE,
		PALMAS_ALARM_SECONDS_REG, alarm_data, PALMAS_NUM_TIME_REGS);
	if (ret < 0) {
		dev_err(dev, "ALARM_SECONDS_REG write failed, err = %d\n", ret);
		return ret;
	}

	if (alm->enabled)
		ret = palmas_rtc_alarm_irq_enable(dev, 1);
	return ret;
}

static int palmas_clear_interrupts(struct device *dev)
{
	struct palmas *palmas = dev_get_drvdata(dev->parent);
	unsigned int rtc_reg;
	int ret;

	ret = palmas_read(palmas, PALMAS_RTC_BASE, PALMAS_RTC_STATUS_REG,
				&rtc_reg);
	if (ret < 0) {
		dev_err(dev, "RTC_STATUS read failed, err = %d\n", ret);
		return ret;
	}

	ret = palmas_write(palmas, PALMAS_RTC_BASE, PALMAS_RTC_STATUS_REG,
			rtc_reg);
	if (ret < 0) {
		dev_err(dev, "RTC_STATUS write failed, err = %d\n", ret);
		return ret;
	}
	return 0;
}

static irqreturn_t palmas_rtc_interrupt(int irq, void *context)
{
	struct palmas_rtc *palmas_rtc = context;
	struct device *dev = palmas_rtc->dev;
	int ret;

	ret = palmas_clear_interrupts(dev);
	if (ret < 0) {
		dev_err(dev, "RTC interrupt clear failed, err = %d\n", ret);
		return IRQ_NONE;
	}

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

static struct rtc_class_ops palmas_rtc_ops = {
	.read_time	= palmas_rtc_read_time,
	.set_time	= palmas_rtc_set_time,
	.read_alarm	= palmas_rtc_read_alarm,
	.set_alarm	= palmas_rtc_set_alarm,
	.alarm_irq_enable = palmas_rtc_alarm_irq_enable,
};

static int palmas_rtc_probe(struct platform_device *pdev)
{
	struct palmas *palmas = dev_get_drvdata(pdev->dev.parent);
	struct palmas_rtc *palmas_rtc = NULL;
	int ret;
	bool enable_bb_charging = false;
	bool high_bb_charging = false;

	if (pdev->dev.of_node) {
		enable_bb_charging = of_property_read_bool(pdev->dev.of_node,
					"ti,backup-battery-chargeable");
		high_bb_charging = of_property_read_bool(pdev->dev.of_node,
					"ti,backup-battery-charge-high-current");
	}

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

	/* Clear pending interrupts */
	ret = palmas_clear_interrupts(&pdev->dev);
	if (ret < 0) {
		dev_err(&pdev->dev, "clear RTC int failed, err = %d\n", ret);
		return ret;
	}

	palmas_rtc->dev = &pdev->dev;
	platform_set_drvdata(pdev, palmas_rtc);

	if (enable_bb_charging) {
		unsigned reg = PALMAS_BACKUP_BATTERY_CTRL_BBS_BBC_LOW_ICHRG;

		if (high_bb_charging)
			reg = 0;

		ret = palmas_update_bits(palmas, PALMAS_PMU_CONTROL_BASE,
			PALMAS_BACKUP_BATTERY_CTRL,
			PALMAS_BACKUP_BATTERY_CTRL_BBS_BBC_LOW_ICHRG, reg);
		if (ret < 0) {
			dev_err(&pdev->dev,
				"BACKUP_BATTERY_CTRL update failed, %d\n", ret);
			return ret;
		}

		ret = palmas_update_bits(palmas, PALMAS_PMU_CONTROL_BASE,
			PALMAS_BACKUP_BATTERY_CTRL,
			PALMAS_BACKUP_BATTERY_CTRL_BB_CHG_EN,
			PALMAS_BACKUP_BATTERY_CTRL_BB_CHG_EN);
		if (ret < 0) {
			dev_err(&pdev->dev,
				"BACKUP_BATTERY_CTRL update failed, %d\n", ret);
			return ret;
		}
	}

	/* Start RTC */
	ret = palmas_update_bits(palmas, PALMAS_RTC_BASE, PALMAS_RTC_CTRL_REG,
			PALMAS_RTC_CTRL_REG_STOP_RTC,
			PALMAS_RTC_CTRL_REG_STOP_RTC);
	if (ret < 0) {
		dev_err(&pdev->dev, "RTC_CTRL write failed, err = %d\n", ret);
		return ret;
	}

	palmas_rtc->irq = platform_get_irq(pdev, 0);

	device_init_wakeup(&pdev->dev, 1);
	palmas_rtc->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
				&palmas_rtc_ops, THIS_MODULE);
	if (IS_ERR(palmas_rtc->rtc)) {
		ret = PTR_ERR(palmas_rtc->rtc);
		dev_err(&pdev->dev, "RTC register failed, err = %d\n", ret);
		return ret;
	}

	ret = devm_request_threaded_irq(&pdev->dev, palmas_rtc->irq, NULL,
			palmas_rtc_interrupt,
			IRQF_TRIGGER_LOW | IRQF_ONESHOT,
			dev_name(&pdev->dev), palmas_rtc);
	if (ret < 0) {
		dev_err(&pdev->dev, "IRQ request failed, err = %d\n", ret);
		return ret;
	}

	return 0;
}

static int palmas_rtc_remove(struct platform_device *pdev)
{
	palmas_rtc_alarm_irq_enable(&pdev->dev, 0);
	return 0;
}

#ifdef CONFIG_PM_SLEEP
static int palmas_rtc_suspend(struct device *dev)
{
	struct palmas_rtc *palmas_rtc = dev_get_drvdata(dev);

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

static int palmas_rtc_resume(struct device *dev)
{
	struct palmas_rtc *palmas_rtc = dev_get_drvdata(dev);

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

static SIMPLE_DEV_PM_OPS(palmas_rtc_pm_ops, palmas_rtc_suspend,
			 palmas_rtc_resume);

#ifdef CONFIG_OF
static const struct of_device_id of_palmas_rtc_match[] = {
	{ .compatible = "ti,palmas-rtc"},
	{ },
};
MODULE_DEVICE_TABLE(of, of_palmas_rtc_match);
#endif

static struct platform_driver palmas_rtc_driver = {
	.probe		= palmas_rtc_probe,
	.remove		= palmas_rtc_remove,
	.driver		= {
		.name	= "palmas-rtc",
		.pm	= &palmas_rtc_pm_ops,
		.of_match_table = of_match_ptr(of_palmas_rtc_match),
	},
};

module_platform_driver(palmas_rtc_driver);

MODULE_ALIAS("platform:palmas_rtc");
MODULE_DESCRIPTION("TI PALMAS series RTC driver");
MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
0101e53c LD	1	/*
	2	* rtc-palmas.c -- Palmas Real Time Clock driver.
	3
	4	* RTC driver for TI Palma series devices like TPS65913,
	5	* TPS65914 power management IC.
	6	*
	7	* Copyright (c) 2012, NVIDIA Corporation.
	8	*
	9	* Author: Laxman Dewangan <ldewangan@nvidia.com>
	10	*
	11	* This program is free software; you can redistribute it and/or
	12	* modify it under the terms of the GNU General Public License as
	13	* published by the Free Software Foundation version 2.
	14	*
	15	* This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,
	16	* whether express or implied; without even the implied warranty of
	17	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	18	* General Public License for more details.
	19	*
	20	* You should have received a copy of the GNU General Public License
	21	* along with this program; if not, write to the Free Software
	22	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
	23	* 02111-1307, USA
	24	*/
	25
	26	#include <linux/bcd.h>
	27	#include <linux/errno.h>
	28	#include <linux/init.h>
	29	#include <linux/interrupt.h>
	30	#include <linux/kernel.h>
	31	#include <linux/mfd/palmas.h>
	32	#include <linux/module.h>
0288d2e3	33	#include <linux/of.h>
0101e53c LD	34	#include <linux/rtc.h>
	35	#include <linux/types.h>
	36	#include <linux/platform_device.h>
	37	#include <linux/pm.h>
	38
	39	struct palmas_rtc {
	40	struct rtc_device *rtc;
	41	struct device *dev;
	42	unsigned int irq;
	43	};
	44
	45	/* Total number of RTC registers needed to set time*/
	46	#define PALMAS_NUM_TIME_REGS (PALMAS_YEARS_REG - PALMAS_SECONDS_REG + 1)
	47
	48	static int palmas_rtc_read_time(struct device dev, struct rtc_time tm)
	49	{
	50	unsigned char rtc_data[PALMAS_NUM_TIME_REGS];
	51	struct palmas *palmas = dev_get_drvdata(dev->parent);
	52	int ret;
	53
	54	/* Copy RTC counting registers to static registers or latches */
	55	ret = palmas_update_bits(palmas, PALMAS_RTC_BASE, PALMAS_RTC_CTRL_REG,
	56	PALMAS_RTC_CTRL_REG_GET_TIME, PALMAS_RTC_CTRL_REG_GET_TIME);
	57	if (ret < 0) {
	58	dev_err(dev, "RTC CTRL reg update failed, err: %d\n", ret);
	59	return ret;
	60	}
	61
	62	ret = palmas_bulk_read(palmas, PALMAS_RTC_BASE, PALMAS_SECONDS_REG,
	63	rtc_data, PALMAS_NUM_TIME_REGS);
	64	if (ret < 0) {
	65	dev_err(dev, "RTC_SECONDS reg read failed, err = %d\n", ret);
	66	return ret;
	67	}
	68
	69	tm->tm_sec = bcd2bin(rtc_data[0]);
	70	tm->tm_min = bcd2bin(rtc_data[1]);
	71	tm->tm_hour = bcd2bin(rtc_data[2]);
	72	tm->tm_mday = bcd2bin(rtc_data[3]);
	73	tm->tm_mon = bcd2bin(rtc_data[4]) - 1;
	74	tm->tm_year = bcd2bin(rtc_data[5]) + 100;
	75
	76	return ret;
	77	}
	78
	79	static int palmas_rtc_set_time(struct device dev, struct rtc_time tm)
	80	{
	81	unsigned char rtc_data[PALMAS_NUM_TIME_REGS];
	82	struct palmas *palmas = dev_get_drvdata(dev->parent);
	83	int ret;
	84
	85	rtc_data[0] = bin2bcd(tm->tm_sec);
	86	rtc_data[1] = bin2bcd(tm->tm_min);
	87	rtc_data[2] = bin2bcd(tm->tm_hour);
	88	rtc_data[3] = bin2bcd(tm->tm_mday);
	89	rtc_data[4] = bin2bcd(tm->tm_mon + 1);
	90	rtc_data[5] = bin2bcd(tm->tm_year - 100);
	91
	92	/* Stop RTC while updating the RTC time registers */
	93	ret = palmas_update_bits(palmas, PALMAS_RTC_BASE, PALMAS_RTC_CTRL_REG,
	94	PALMAS_RTC_CTRL_REG_STOP_RTC, 0);
	95	if (ret < 0) {
	96	dev_err(dev, "RTC stop failed, err = %d\n", ret);
	97	return ret;
98	}
99
100	ret = palmas_bulk_write(palmas, PALMAS_RTC_BASE, PALMAS_SECONDS_REG,
101	rtc_data, PALMAS_NUM_TIME_REGS);
102	if (ret < 0) {
103	dev_err(dev, "RTC_SECONDS reg write failed, err = %d\n", ret);
104	return ret;
105	}
106
107	/* Start back RTC */
108	ret = palmas_update_bits(palmas, PALMAS_RTC_BASE, PALMAS_RTC_CTRL_REG,
109	PALMAS_RTC_CTRL_REG_STOP_RTC, PALMAS_RTC_CTRL_REG_STOP_RTC);
110	if (ret < 0)
111	dev_err(dev, "RTC start failed, err = %d\n", ret);
112	return ret;
113	}
114
115	static int palmas_rtc_alarm_irq_enable(struct device *dev, unsigned enabled)
116	{
117	struct palmas *palmas = dev_get_drvdata(dev->parent);
118	u8 val;
119
120	val = enabled ? PALMAS_RTC_INTERRUPTS_REG_IT_ALARM : 0;
121	return palmas_write(palmas, PALMAS_RTC_BASE,
122	PALMAS_RTC_INTERRUPTS_REG, val);
123	}
124
125	static int palmas_rtc_read_alarm(struct device dev, struct rtc_wkalrm alm)
126	{
127	unsigned char alarm_data[PALMAS_NUM_TIME_REGS];
128	u32 int_val;
129	struct palmas *palmas = dev_get_drvdata(dev->parent);
130	int ret;
131
132	ret = palmas_bulk_read(palmas, PALMAS_RTC_BASE,
133	PALMAS_ALARM_SECONDS_REG,
134	alarm_data, PALMAS_NUM_TIME_REGS);
135	if (ret < 0) {
136	dev_err(dev, "RTC_ALARM_SECONDS read failed, err = %d\n", ret);
137	return ret;
138	}
139
140	alm->time.tm_sec = bcd2bin(alarm_data[0]);
141	alm->time.tm_min = bcd2bin(alarm_data[1]);
142	alm->time.tm_hour = bcd2bin(alarm_data[2]);
143	alm->time.tm_mday = bcd2bin(alarm_data[3]);
144	alm->time.tm_mon = bcd2bin(alarm_data[4]) - 1;
145	alm->time.tm_year = bcd2bin(alarm_data[5]) + 100;
146
147	ret = palmas_read(palmas, PALMAS_RTC_BASE, PALMAS_RTC_INTERRUPTS_REG,
148	&int_val);
149	if (ret < 0) {
150	dev_err(dev, "RTC_INTERRUPTS reg read failed, err = %d\n", ret);
151	return ret;
152	}
153
154	if (int_val & PALMAS_RTC_INTERRUPTS_REG_IT_ALARM)
155	alm->enabled = 1;
156	return ret;
157	}
158
159	static int palmas_rtc_set_alarm(struct device dev, struct rtc_wkalrm alm)
160	{
161	unsigned char alarm_data[PALMAS_NUM_TIME_REGS];
162	struct palmas *palmas = dev_get_drvdata(dev->parent);
163	int ret;
164
165	ret = palmas_rtc_alarm_irq_enable(dev, 0);
166	if (ret < 0) {
167	dev_err(dev, "Disable RTC alarm failed\n");
168	return ret;
169	}
170
171	alarm_data[0] = bin2bcd(alm->time.tm_sec);
172	alarm_data[1] = bin2bcd(alm->time.tm_min);
173	alarm_data[2] = bin2bcd(alm->time.tm_hour);
174	alarm_data[3] = bin2bcd(alm->time.tm_mday);
175	alarm_data[4] = bin2bcd(alm->time.tm_mon + 1);
176	alarm_data[5] = bin2bcd(alm->time.tm_year - 100);
177
178	ret = palmas_bulk_write(palmas, PALMAS_RTC_BASE,
179	PALMAS_ALARM_SECONDS_REG, alarm_data, PALMAS_NUM_TIME_REGS);
180	if (ret < 0) {
181	dev_err(dev, "ALARM_SECONDS_REG write failed, err = %d\n", ret);
182	return ret;
183	}
184
185	if (alm->enabled)
186	ret = palmas_rtc_alarm_irq_enable(dev, 1);
187	return ret;
188	}
189
190	static int palmas_clear_interrupts(struct device *dev)
191	{
192	struct palmas *palmas = dev_get_drvdata(dev->parent);
193	unsigned int rtc_reg;
194	int ret;
195
196	ret = palmas_read(palmas, PALMAS_RTC_BASE, PALMAS_RTC_STATUS_REG,
197	&rtc_reg);
198	if (ret < 0) {
199	dev_err(dev, "RTC_STATUS read failed, err = %d\n", ret);
200	return ret;
201	}
202
203	ret = palmas_write(palmas, PALMAS_RTC_BASE, PALMAS_RTC_STATUS_REG,
204	rtc_reg);
205	if (ret < 0) {
206	dev_err(dev, "RTC_STATUS write failed, err = %d\n", ret);
207	return ret;
208	}
209	return 0;
210	}
211
212	static irqreturn_t palmas_rtc_interrupt(int irq, void *context)
213	{
214	struct palmas_rtc *palmas_rtc = context;
215	struct device *dev = palmas_rtc->dev;
216	int ret;
217
218	ret = palmas_clear_interrupts(dev);
219	if (ret < 0) {
220	dev_err(dev, "RTC interrupt clear failed, err = %d\n", ret);
221	return IRQ_NONE;
222	}
223
224	rtc_update_irq(palmas_rtc->rtc, 1, RTC_IRQF \| RTC_AF);
225	return IRQ_HANDLED;
226	}
227
228	static struct rtc_class_ops palmas_rtc_ops = {
229	.read_time = palmas_rtc_read_time,
230	.set_time = palmas_rtc_set_time,
231	.read_alarm = palmas_rtc_read_alarm,
232	.set_alarm = palmas_rtc_set_alarm,
233	.alarm_irq_enable = palmas_rtc_alarm_irq_enable,
234	};
235
236	static int palmas_rtc_probe(struct platform_device *pdev)
237	{
238	struct palmas *palmas = dev_get_drvdata(pdev->dev.parent);
239	struct palmas_rtc *palmas_rtc = NULL;
240	int ret;
666a584d	241	bool enable_bb_charging = false;
d200c79b	242	bool high_bb_charging = false;
666a584d LD	243
	244	if (pdev->dev.of_node) {
	245	enable_bb_charging = of_property_read_bool(pdev->dev.of_node,
	246	"ti,backup-battery-chargeable");
	247	high_bb_charging = of_property_read_bool(pdev->dev.of_node,
	248	"ti,backup-battery-charge-high-current");
	249	}
0101e53c LD	250
	251	palmas_rtc = devm_kzalloc(&pdev->dev, sizeof(struct palmas_rtc),
	252	GFP_KERNEL);
	253	if (!palmas_rtc)
	254	return -ENOMEM;
	255
	256	/* Clear pending interrupts */
	257	ret = palmas_clear_interrupts(&pdev->dev);
	258	if (ret < 0) {
	259	dev_err(&pdev->dev, "clear RTC int failed, err = %d\n", ret);
	260	return ret;
	261	}
	262
	263	palmas_rtc->dev = &pdev->dev;
	264	platform_set_drvdata(pdev, palmas_rtc);
	265
666a584d LD	266	if (enable_bb_charging) {
	267	unsigned reg = PALMAS_BACKUP_BATTERY_CTRL_BBS_BBC_LOW_ICHRG;
	268
	269	if (high_bb_charging)
	270	reg = 0;
	271
	272	ret = palmas_update_bits(palmas, PALMAS_PMU_CONTROL_BASE,
	273	PALMAS_BACKUP_BATTERY_CTRL,
	274	PALMAS_BACKUP_BATTERY_CTRL_BBS_BBC_LOW_ICHRG, reg);
	275	if (ret < 0) {
	276	dev_err(&pdev->dev,
	277	"BACKUP_BATTERY_CTRL update failed, %d\n", ret);
	278	return ret;
	279	}
	280
	281	ret = palmas_update_bits(palmas, PALMAS_PMU_CONTROL_BASE,
	282	PALMAS_BACKUP_BATTERY_CTRL,
	283	PALMAS_BACKUP_BATTERY_CTRL_BB_CHG_EN,
	284	PALMAS_BACKUP_BATTERY_CTRL_BB_CHG_EN);
	285	if (ret < 0) {
	286	dev_err(&pdev->dev,
	287	"BACKUP_BATTERY_CTRL update failed, %d\n", ret);
	288	return ret;
	289	}
	290	}
	291
0101e53c LD	292	/* Start RTC */
	293	ret = palmas_update_bits(palmas, PALMAS_RTC_BASE, PALMAS_RTC_CTRL_REG,
	294	PALMAS_RTC_CTRL_REG_STOP_RTC,
	295	PALMAS_RTC_CTRL_REG_STOP_RTC);
	296	if (ret < 0) {
	297	dev_err(&pdev->dev, "RTC_CTRL write failed, err = %d\n", ret);
	298	return ret;
	299	}
	300
	301	palmas_rtc->irq = platform_get_irq(pdev, 0);
	302
2c5a5b30	303	device_init_wakeup(&pdev->dev, 1);
27971335	304	palmas_rtc->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
0101e53c LD	305	&palmas_rtc_ops, THIS_MODULE);
	306	if (IS_ERR(palmas_rtc->rtc)) {
	307	ret = PTR_ERR(palmas_rtc->rtc);
	308	dev_err(&pdev->dev, "RTC register failed, err = %d\n", ret);
	309	return ret;
	310	}
	311
27971335	312	ret = devm_request_threaded_irq(&pdev->dev, palmas_rtc->irq, NULL,
0101e53c	313	palmas_rtc_interrupt,
b3be3f6a	314	IRQF_TRIGGER_LOW \| IRQF_ONESHOT,
0101e53c LD	315	dev_name(&pdev->dev), palmas_rtc);
	316	if (ret < 0) {
	317	dev_err(&pdev->dev, "IRQ request failed, err = %d\n", ret);
0101e53c LD	318	return ret;
	319	}
	320
0101e53c LD	321	return 0;
	322	}
	323
	324	static int palmas_rtc_remove(struct platform_device *pdev)
	325	{
0101e53c	326	palmas_rtc_alarm_irq_enable(&pdev->dev, 0);
0101e53c LD	327	return 0;
	328	}
	329
	330	#ifdef CONFIG_PM_SLEEP
	331	static int palmas_rtc_suspend(struct device *dev)
	332	{
	333	struct palmas_rtc *palmas_rtc = dev_get_drvdata(dev);
	334
	335	if (device_may_wakeup(dev))
	336	enable_irq_wake(palmas_rtc->irq);
	337	return 0;
	338	}
	339
	340	static int palmas_rtc_resume(struct device *dev)
	341	{
	342	struct palmas_rtc *palmas_rtc = dev_get_drvdata(dev);
	343
	344	if (device_may_wakeup(dev))
	345	disable_irq_wake(palmas_rtc->irq);
	346	return 0;
	347	}
	348	#endif
	349
3f93822d JH	350	static SIMPLE_DEV_PM_OPS(palmas_rtc_pm_ops, palmas_rtc_suspend,
3f93822d JH	351	palmas_rtc_resume);
0101e53c	352
0288d2e3	353	#ifdef CONFIG_OF
7abe3f54	354	static const struct of_device_id of_palmas_rtc_match[] = {
0288d2e3 LD	355	{ .compatible = "ti,palmas-rtc"},
	356	{ },
	357	};
	358	MODULE_DEVICE_TABLE(of, of_palmas_rtc_match);
	359	#endif
	360
0101e53c LD	361	static struct platform_driver palmas_rtc_driver = {
	362	.probe = palmas_rtc_probe,
	363	.remove = palmas_rtc_remove,
	364	.driver = {
0101e53c LD	365	.name = "palmas-rtc",
0101e53c LD	366	.pm = &palmas_rtc_pm_ops,
0288d2e3	367	.of_match_table = of_match_ptr(of_palmas_rtc_match),
0101e53c LD	368	},
	369	};
	370
	371	module_platform_driver(palmas_rtc_driver);
	372
	373	MODULE_ALIAS("platform:palmas_rtc");
	374	MODULE_DESCRIPTION("TI PALMAS series RTC driver");
	375	MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
	376	MODULE_LICENSE("GPL v2");