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

// SPDX-License-Identifier: GPL-2.0
// RTC driver for ChromeOS Embedded Controller.
//
// Copyright (C) 2017 Google, Inc.
// Author: Stephen Barber <smbarber@chromium.org>

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_data/cros_ec_commands.h>
#include <linux/platform_data/cros_ec_proto.h>
#include <linux/platform_device.h>
#include <linux/rtc.h>
#include <linux/slab.h>

#define DRV_NAME	"cros-ec-rtc"

/**
 * struct cros_ec_rtc - Driver data for EC RTC
 *
 * @cros_ec: Pointer to EC device
 * @rtc: Pointer to RTC device
 * @notifier: Notifier info for responding to EC events
 * @saved_alarm: Alarm to restore when interrupts are reenabled
 */
struct cros_ec_rtc {
	struct cros_ec_device *cros_ec;
	struct rtc_device *rtc;
	struct notifier_block notifier;
	u32 saved_alarm;
};

static int cros_ec_rtc_get(struct cros_ec_device *cros_ec, u32 command,
			   u32 *response)
{
	int ret;
	struct {
		struct cros_ec_command msg;
		struct ec_response_rtc data;
	} __packed msg;

	memset(&msg, 0, sizeof(msg));
	msg.msg.command = command;
	msg.msg.insize = sizeof(msg.data);

	ret = cros_ec_cmd_xfer_status(cros_ec, &msg.msg);
	if (ret < 0) {
		dev_err(cros_ec->dev,
			"error getting %s from EC: %d\n",
			command == EC_CMD_RTC_GET_VALUE ? "time" : "alarm",
			ret);
		return ret;
	}

	*response = msg.data.time;

	return 0;
}

static int cros_ec_rtc_set(struct cros_ec_device *cros_ec, u32 command,
			   u32 param)
{
	int ret = 0;
	struct {
		struct cros_ec_command msg;
		struct ec_response_rtc data;
	} __packed msg;

	memset(&msg, 0, sizeof(msg));
	msg.msg.command = command;
	msg.msg.outsize = sizeof(msg.data);
	msg.data.time = param;

	ret = cros_ec_cmd_xfer_status(cros_ec, &msg.msg);
	if (ret < 0) {
		dev_err(cros_ec->dev, "error setting %s on EC: %d\n",
			command == EC_CMD_RTC_SET_VALUE ? "time" : "alarm",
			ret);
		return ret;
	}

	return 0;
}

/* Read the current time from the EC. */
static int cros_ec_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
	struct cros_ec_rtc *cros_ec_rtc = dev_get_drvdata(dev);
	struct cros_ec_device *cros_ec = cros_ec_rtc->cros_ec;
	int ret;
	u32 time;

	ret = cros_ec_rtc_get(cros_ec, EC_CMD_RTC_GET_VALUE, &time);
	if (ret) {
		dev_err(dev, "error getting time: %d\n", ret);
		return ret;
	}

	rtc_time64_to_tm(time, tm);

	return 0;
}

/* Set the current EC time. */
static int cros_ec_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
	struct cros_ec_rtc *cros_ec_rtc = dev_get_drvdata(dev);
	struct cros_ec_device *cros_ec = cros_ec_rtc->cros_ec;
	int ret;
	time64_t time = rtc_tm_to_time64(tm);

	ret = cros_ec_rtc_set(cros_ec, EC_CMD_RTC_SET_VALUE, (u32)time);
	if (ret < 0) {
		dev_err(dev, "error setting time: %d\n", ret);
		return ret;
	}

	return 0;
}

/* Read alarm time from RTC. */
static int cros_ec_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
	struct cros_ec_rtc *cros_ec_rtc = dev_get_drvdata(dev);
	struct cros_ec_device *cros_ec = cros_ec_rtc->cros_ec;
	int ret;
	u32 current_time, alarm_offset;

	/*
	 * The EC host command for getting the alarm is relative (i.e. 5
	 * seconds from now) whereas rtc_wkalrm is absolute. Get the current
	 * RTC time first so we can calculate the relative time.
	 */
	ret = cros_ec_rtc_get(cros_ec, EC_CMD_RTC_GET_VALUE, &current_time);
	if (ret < 0) {
		dev_err(dev, "error getting time: %d\n", ret);
		return ret;
	}

	ret = cros_ec_rtc_get(cros_ec, EC_CMD_RTC_GET_ALARM, &alarm_offset);
	if (ret < 0) {
		dev_err(dev, "error getting alarm: %d\n", ret);
		return ret;
	}

	rtc_time64_to_tm(current_time + alarm_offset, &alrm->time);

	return 0;
}

/* Set the EC's RTC alarm. */
static int cros_ec_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
	struct cros_ec_rtc *cros_ec_rtc = dev_get_drvdata(dev);
	struct cros_ec_device *cros_ec = cros_ec_rtc->cros_ec;
	int ret;
	time64_t alarm_time;
	u32 current_time, alarm_offset;

	/*
	 * The EC host command for setting the alarm is relative
	 * (i.e. 5 seconds from now) whereas rtc_wkalrm is absolute.
	 * Get the current RTC time first so we can calculate the
	 * relative time.
	 */
	ret = cros_ec_rtc_get(cros_ec, EC_CMD_RTC_GET_VALUE, &current_time);
	if (ret < 0) {
		dev_err(dev, "error getting time: %d\n", ret);
		return ret;
	}

	alarm_time = rtc_tm_to_time64(&alrm->time);

	if (alarm_time < 0 || alarm_time > U32_MAX)
		return -EINVAL;

	if (!alrm->enabled) {
		/*
		 * If the alarm is being disabled, send an alarm
		 * clear command.
		 */
		alarm_offset = EC_RTC_ALARM_CLEAR;
		cros_ec_rtc->saved_alarm = (u32)alarm_time;
	} else {
		/* Don't set an alarm in the past. */
		if ((u32)alarm_time <= current_time)
			return -ETIME;

		alarm_offset = (u32)alarm_time - current_time;
	}

	ret = cros_ec_rtc_set(cros_ec, EC_CMD_RTC_SET_ALARM, alarm_offset);
	if (ret < 0) {
		dev_err(dev, "error setting alarm: %d\n", ret);
		return ret;
	}

	return 0;
}

static int cros_ec_rtc_alarm_irq_enable(struct device *dev,
					unsigned int enabled)
{
	struct cros_ec_rtc *cros_ec_rtc = dev_get_drvdata(dev);
	struct cros_ec_device *cros_ec = cros_ec_rtc->cros_ec;
	int ret;
	u32 current_time, alarm_offset, alarm_value;

	ret = cros_ec_rtc_get(cros_ec, EC_CMD_RTC_GET_VALUE, &current_time);
	if (ret < 0) {
		dev_err(dev, "error getting time: %d\n", ret);
		return ret;
	}

	if (enabled) {
		/* Restore saved alarm if it's still in the future. */
		if (cros_ec_rtc->saved_alarm < current_time)
			alarm_offset = EC_RTC_ALARM_CLEAR;
		else
			alarm_offset = cros_ec_rtc->saved_alarm - current_time;

		ret = cros_ec_rtc_set(cros_ec, EC_CMD_RTC_SET_ALARM,
				      alarm_offset);
		if (ret < 0) {
			dev_err(dev, "error restoring alarm: %d\n", ret);
			return ret;
		}
	} else {
		/* Disable alarm, saving the old alarm value. */
		ret = cros_ec_rtc_get(cros_ec, EC_CMD_RTC_GET_ALARM,
				      &alarm_offset);
		if (ret < 0) {
			dev_err(dev, "error saving alarm: %d\n", ret);
			return ret;
		}

		alarm_value = current_time + alarm_offset;

		/*
		 * If the current EC alarm is already past, we don't want
		 * to set an alarm when we go through the alarm irq enable
		 * path.
		 */
		if (alarm_value < current_time)
			cros_ec_rtc->saved_alarm = EC_RTC_ALARM_CLEAR;
		else
			cros_ec_rtc->saved_alarm = alarm_value;

		alarm_offset = EC_RTC_ALARM_CLEAR;
		ret = cros_ec_rtc_set(cros_ec, EC_CMD_RTC_SET_ALARM,
				      alarm_offset);
		if (ret < 0) {
			dev_err(dev, "error disabling alarm: %d\n", ret);
			return ret;
		}
	}

	return 0;
}

static int cros_ec_rtc_event(struct notifier_block *nb,
			     unsigned long queued_during_suspend,
			     void *_notify)
{
	struct cros_ec_rtc *cros_ec_rtc;
	struct rtc_device *rtc;
	struct cros_ec_device *cros_ec;
	u32 host_event;

	cros_ec_rtc = container_of(nb, struct cros_ec_rtc, notifier);
	rtc = cros_ec_rtc->rtc;
	cros_ec = cros_ec_rtc->cros_ec;

	host_event = cros_ec_get_host_event(cros_ec);
	if (host_event & EC_HOST_EVENT_MASK(EC_HOST_EVENT_RTC)) {
		rtc_update_irq(rtc, 1, RTC_IRQF | RTC_AF);
		return NOTIFY_OK;
	} else {
		return NOTIFY_DONE;
	}
}

static const struct rtc_class_ops cros_ec_rtc_ops = {
	.read_time = cros_ec_rtc_read_time,
	.set_time = cros_ec_rtc_set_time,
	.read_alarm = cros_ec_rtc_read_alarm,
	.set_alarm = cros_ec_rtc_set_alarm,
	.alarm_irq_enable = cros_ec_rtc_alarm_irq_enable,
};

#ifdef CONFIG_PM_SLEEP
static int cros_ec_rtc_suspend(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct cros_ec_rtc *cros_ec_rtc = dev_get_drvdata(&pdev->dev);

	if (device_may_wakeup(dev))
		return enable_irq_wake(cros_ec_rtc->cros_ec->irq);

	return 0;
}

static int cros_ec_rtc_resume(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct cros_ec_rtc *cros_ec_rtc = dev_get_drvdata(&pdev->dev);

	if (device_may_wakeup(dev))
		return disable_irq_wake(cros_ec_rtc->cros_ec->irq);

	return 0;
}
#endif

static SIMPLE_DEV_PM_OPS(cros_ec_rtc_pm_ops, cros_ec_rtc_suspend,
			 cros_ec_rtc_resume);

static int cros_ec_rtc_probe(struct platform_device *pdev)
{
	struct cros_ec_dev *ec_dev = dev_get_drvdata(pdev->dev.parent);
	struct cros_ec_device *cros_ec = ec_dev->ec_dev;
	struct cros_ec_rtc *cros_ec_rtc;
	struct rtc_time tm;
	int ret;

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

	platform_set_drvdata(pdev, cros_ec_rtc);
	cros_ec_rtc->cros_ec = cros_ec;

	/* Get initial time */
	ret = cros_ec_rtc_read_time(&pdev->dev, &tm);
	if (ret) {
		dev_err(&pdev->dev, "failed to read RTC time\n");
		return ret;
	}

	ret = device_init_wakeup(&pdev->dev, 1);
	if (ret) {
		dev_err(&pdev->dev, "failed to initialize wakeup\n");
		return ret;
	}

	cros_ec_rtc->rtc = devm_rtc_allocate_device(&pdev->dev);
	if (IS_ERR(cros_ec_rtc->rtc))
		return PTR_ERR(cros_ec_rtc->rtc);

	cros_ec_rtc->rtc->ops = &cros_ec_rtc_ops;
	cros_ec_rtc->rtc->range_max = U32_MAX;

	ret = devm_rtc_register_device(cros_ec_rtc->rtc);
	if (ret)
		return ret;

	/* Get RTC events from the EC. */
	cros_ec_rtc->notifier.notifier_call = cros_ec_rtc_event;
	ret = blocking_notifier_chain_register(&cros_ec->event_notifier,
					       &cros_ec_rtc->notifier);
	if (ret) {
		dev_err(&pdev->dev, "failed to register notifier\n");
		return ret;
	}

	return 0;
}

static int cros_ec_rtc_remove(struct platform_device *pdev)
{
	struct cros_ec_rtc *cros_ec_rtc = platform_get_drvdata(pdev);
	struct device *dev = &pdev->dev;
	int ret;

	ret = blocking_notifier_chain_unregister(
				&cros_ec_rtc->cros_ec->event_notifier,
				&cros_ec_rtc->notifier);
	if (ret) {
		dev_err(dev, "failed to unregister notifier\n");
		return ret;
	}

	return 0;
}

static struct platform_driver cros_ec_rtc_driver = {
	.probe = cros_ec_rtc_probe,
	.remove = cros_ec_rtc_remove,
	.driver = {
		.name = DRV_NAME,
		.pm = &cros_ec_rtc_pm_ops,
	},
};

module_platform_driver(cros_ec_rtc_driver);

MODULE_DESCRIPTION("RTC driver for Chrome OS ECs");
MODULE_AUTHOR("Stephen Barber <smbarber@chromium.org>");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:" DRV_NAME);
Commit	Line	Data
8ee4aee5 EBS	1	// SPDX-License-Identifier: GPL-2.0
	2	// RTC driver for ChromeOS Embedded Controller.
	3	//
	4	// Copyright (C) 2017 Google, Inc.
	5	// Author: Stephen Barber <smbarber@chromium.org>
6f2a71a3 SB	6
6f2a71a3 SB	7	#include <linux/kernel.h>
6f2a71a3	8	#include <linux/module.h>
840d9f13 EBS	9	#include <linux/platform_data/cros_ec_commands.h>
840d9f13 EBS	10	#include <linux/platform_data/cros_ec_proto.h>
6f2a71a3 SB	11	#include <linux/platform_device.h>
	12	#include <linux/rtc.h>
	13	#include <linux/slab.h>
	14
	15	#define DRV_NAME "cros-ec-rtc"
	16
	17	/**
	18	* struct cros_ec_rtc - Driver data for EC RTC
	19	*
	20	* @cros_ec: Pointer to EC device
	21	* @rtc: Pointer to RTC device
	22	* @notifier: Notifier info for responding to EC events
	23	* @saved_alarm: Alarm to restore when interrupts are reenabled
	24	*/
	25	struct cros_ec_rtc {
	26	struct cros_ec_device *cros_ec;
	27	struct rtc_device *rtc;
	28	struct notifier_block notifier;
	29	u32 saved_alarm;
	30	};
	31
	32	static int cros_ec_rtc_get(struct cros_ec_device *cros_ec, u32 command,
	33	u32 *response)
	34	{
	35	int ret;
	36	struct {
	37	struct cros_ec_command msg;
	38	struct ec_response_rtc data;
	39	} __packed msg;
	40
	41	memset(&msg, 0, sizeof(msg));
	42	msg.msg.command = command;
	43	msg.msg.insize = sizeof(msg.data);
	44
	45	ret = cros_ec_cmd_xfer_status(cros_ec, &msg.msg);
	46	if (ret < 0) {
	47	dev_err(cros_ec->dev,
	48	"error getting %s from EC: %d\n",
	49	command == EC_CMD_RTC_GET_VALUE ? "time" : "alarm",
	50	ret);
	51	return ret;
	52	}
	53
	54	*response = msg.data.time;
	55
	56	return 0;
	57	}
	58
	59	static int cros_ec_rtc_set(struct cros_ec_device *cros_ec, u32 command,
	60	u32 param)
	61	{
	62	int ret = 0;
	63	struct {
	64	struct cros_ec_command msg;
	65	struct ec_response_rtc data;
	66	} __packed msg;
	67
	68	memset(&msg, 0, sizeof(msg));
	69	msg.msg.command = command;
	70	msg.msg.outsize = sizeof(msg.data);
	71	msg.data.time = param;
	72
	73	ret = cros_ec_cmd_xfer_status(cros_ec, &msg.msg);
	74	if (ret < 0) {
75	dev_err(cros_ec->dev, "error setting %s on EC: %d\n",
76	command == EC_CMD_RTC_SET_VALUE ? "time" : "alarm",
77	ret);
78	return ret;
79	}
80
81	return 0;
82	}
83
84	/* Read the current time from the EC. */
85	static int cros_ec_rtc_read_time(struct device dev, struct rtc_time tm)
86	{
87	struct cros_ec_rtc *cros_ec_rtc = dev_get_drvdata(dev);
88	struct cros_ec_device *cros_ec = cros_ec_rtc->cros_ec;
89	int ret;
90	u32 time;
91
92	ret = cros_ec_rtc_get(cros_ec, EC_CMD_RTC_GET_VALUE, &time);
93	if (ret) {
94	dev_err(dev, "error getting time: %d\n", ret);
95	return ret;
96	}
97
98	rtc_time64_to_tm(time, tm);
99
100	return 0;
101	}
102
103	/* Set the current EC time. */
104	static int cros_ec_rtc_set_time(struct device dev, struct rtc_time tm)
105	{
106	struct cros_ec_rtc *cros_ec_rtc = dev_get_drvdata(dev);
107	struct cros_ec_device *cros_ec = cros_ec_rtc->cros_ec;
108	int ret;
0e843137	109	time64_t time = rtc_tm_to_time64(tm);
6f2a71a3 SB	110
	111	ret = cros_ec_rtc_set(cros_ec, EC_CMD_RTC_SET_VALUE, (u32)time);
	112	if (ret < 0) {
	113	dev_err(dev, "error setting time: %d\n", ret);
	114	return ret;
	115	}
	116
	117	return 0;
	118	}
	119
	120	/* Read alarm time from RTC. */
	121	static int cros_ec_rtc_read_alarm(struct device dev, struct rtc_wkalrm alrm)
	122	{
	123	struct cros_ec_rtc *cros_ec_rtc = dev_get_drvdata(dev);
	124	struct cros_ec_device *cros_ec = cros_ec_rtc->cros_ec;
	125	int ret;
	126	u32 current_time, alarm_offset;
	127
	128	/*
	129	* The EC host command for getting the alarm is relative (i.e. 5
	130	* seconds from now) whereas rtc_wkalrm is absolute. Get the current
	131	* RTC time first so we can calculate the relative time.
	132	*/
	133	ret = cros_ec_rtc_get(cros_ec, EC_CMD_RTC_GET_VALUE, &current_time);
	134	if (ret < 0) {
	135	dev_err(dev, "error getting time: %d\n", ret);
	136	return ret;
	137	}
	138
	139	ret = cros_ec_rtc_get(cros_ec, EC_CMD_RTC_GET_ALARM, &alarm_offset);
	140	if (ret < 0) {
	141	dev_err(dev, "error getting alarm: %d\n", ret);
	142	return ret;
	143	}
	144
	145	rtc_time64_to_tm(current_time + alarm_offset, &alrm->time);
	146
	147	return 0;
	148	}
	149
	150	/* Set the EC's RTC alarm. */
	151	static int cros_ec_rtc_set_alarm(struct device dev, struct rtc_wkalrm alrm)
	152	{
	153	struct cros_ec_rtc *cros_ec_rtc = dev_get_drvdata(dev);
	154	struct cros_ec_device *cros_ec = cros_ec_rtc->cros_ec;
	155	int ret;
	156	time64_t alarm_time;
	157	u32 current_time, alarm_offset;
	158
	159	/*
	160	* The EC host command for setting the alarm is relative
	161	* (i.e. 5 seconds from now) whereas rtc_wkalrm is absolute.
	162	* Get the current RTC time first so we can calculate the
	163	* relative time.
	164	*/
	165	ret = cros_ec_rtc_get(cros_ec, EC_CMD_RTC_GET_VALUE, &current_time);
	166	if (ret < 0) {
	167	dev_err(dev, "error getting time: %d\n", ret);
	168	return ret;
	169	}
	170
	171	alarm_time = rtc_tm_to_time64(&alrm->time);
	172
	173	if (alarm_time < 0 \|\| alarm_time > U32_MAX)
174	return -EINVAL;
175
176	if (!alrm->enabled) {
177	/*
178	* If the alarm is being disabled, send an alarm
179	* clear command.
180	*/
181	alarm_offset = EC_RTC_ALARM_CLEAR;
182	cros_ec_rtc->saved_alarm = (u32)alarm_time;
183	} else {
184	/* Don't set an alarm in the past. */
72dd71f0 JC	185	if ((u32)alarm_time <= current_time)
	186	return -ETIME;
	187
	188	alarm_offset = (u32)alarm_time - current_time;
6f2a71a3 SB	189	}
	190
	191	ret = cros_ec_rtc_set(cros_ec, EC_CMD_RTC_SET_ALARM, alarm_offset);
	192	if (ret < 0) {
	193	dev_err(dev, "error setting alarm: %d\n", ret);
	194	return ret;
	195	}
	196
	197	return 0;
	198	}
	199
	200	static int cros_ec_rtc_alarm_irq_enable(struct device *dev,
	201	unsigned int enabled)
	202	{
	203	struct cros_ec_rtc *cros_ec_rtc = dev_get_drvdata(dev);
	204	struct cros_ec_device *cros_ec = cros_ec_rtc->cros_ec;
	205	int ret;
	206	u32 current_time, alarm_offset, alarm_value;
	207
	208	ret = cros_ec_rtc_get(cros_ec, EC_CMD_RTC_GET_VALUE, &current_time);
	209	if (ret < 0) {
	210	dev_err(dev, "error getting time: %d\n", ret);
	211	return ret;
	212	}
	213
	214	if (enabled) {
	215	/* Restore saved alarm if it's still in the future. */
	216	if (cros_ec_rtc->saved_alarm < current_time)
	217	alarm_offset = EC_RTC_ALARM_CLEAR;
	218	else
	219	alarm_offset = cros_ec_rtc->saved_alarm - current_time;
	220
	221	ret = cros_ec_rtc_set(cros_ec, EC_CMD_RTC_SET_ALARM,
	222	alarm_offset);
	223	if (ret < 0) {
	224	dev_err(dev, "error restoring alarm: %d\n", ret);
	225	return ret;
	226	}
	227	} else {
	228	/* Disable alarm, saving the old alarm value. */
	229	ret = cros_ec_rtc_get(cros_ec, EC_CMD_RTC_GET_ALARM,
	230	&alarm_offset);
	231	if (ret < 0) {
	232	dev_err(dev, "error saving alarm: %d\n", ret);
	233	return ret;
	234	}
	235
	236	alarm_value = current_time + alarm_offset;
	237
	238	/*
	239	* If the current EC alarm is already past, we don't want
	240	* to set an alarm when we go through the alarm irq enable
	241	* path.
	242	*/
	243	if (alarm_value < current_time)
	244	cros_ec_rtc->saved_alarm = EC_RTC_ALARM_CLEAR;
	245	else
	246	cros_ec_rtc->saved_alarm = alarm_value;
	247
	248	alarm_offset = EC_RTC_ALARM_CLEAR;
	249	ret = cros_ec_rtc_set(cros_ec, EC_CMD_RTC_SET_ALARM,
	250	alarm_offset);
	251	if (ret < 0) {
	252	dev_err(dev, "error disabling alarm: %d\n", ret);
253	return ret;
254	}
255	}
256
257	return 0;
258	}
259
260	static int cros_ec_rtc_event(struct notifier_block *nb,
261	unsigned long queued_during_suspend,
262	void *_notify)
263	{
264	struct cros_ec_rtc *cros_ec_rtc;
265	struct rtc_device *rtc;
266	struct cros_ec_device *cros_ec;
267	u32 host_event;
268
269	cros_ec_rtc = container_of(nb, struct cros_ec_rtc, notifier);
270	rtc = cros_ec_rtc->rtc;
271	cros_ec = cros_ec_rtc->cros_ec;
272
273	host_event = cros_ec_get_host_event(cros_ec);
274	if (host_event & EC_HOST_EVENT_MASK(EC_HOST_EVENT_RTC)) {
275	rtc_update_irq(rtc, 1, RTC_IRQF \| RTC_AF);
276	return NOTIFY_OK;
277	} else {
278	return NOTIFY_DONE;
279	}
280	}
281
282	static const struct rtc_class_ops cros_ec_rtc_ops = {
283	.read_time = cros_ec_rtc_read_time,
284	.set_time = cros_ec_rtc_set_time,
285	.read_alarm = cros_ec_rtc_read_alarm,
286	.set_alarm = cros_ec_rtc_set_alarm,
287	.alarm_irq_enable = cros_ec_rtc_alarm_irq_enable,
288	};
289
290	#ifdef CONFIG_PM_SLEEP
291	static int cros_ec_rtc_suspend(struct device *dev)
292	{
293	struct platform_device *pdev = to_platform_device(dev);
294	struct cros_ec_rtc *cros_ec_rtc = dev_get_drvdata(&pdev->dev);
295
296	if (device_may_wakeup(dev))
d6752e18	297	return enable_irq_wake(cros_ec_rtc->cros_ec->irq);
6f2a71a3 SB	298
	299	return 0;
	300	}
	301
	302	static int cros_ec_rtc_resume(struct device *dev)
	303	{
	304	struct platform_device *pdev = to_platform_device(dev);
	305	struct cros_ec_rtc *cros_ec_rtc = dev_get_drvdata(&pdev->dev);
	306
	307	if (device_may_wakeup(dev))
d6752e18	308	return disable_irq_wake(cros_ec_rtc->cros_ec->irq);
6f2a71a3 SB	309
	310	return 0;
	311	}
	312	#endif
	313
	314	static SIMPLE_DEV_PM_OPS(cros_ec_rtc_pm_ops, cros_ec_rtc_suspend,
	315	cros_ec_rtc_resume);
	316
	317	static int cros_ec_rtc_probe(struct platform_device *pdev)
	318	{
	319	struct cros_ec_dev *ec_dev = dev_get_drvdata(pdev->dev.parent);
	320	struct cros_ec_device *cros_ec = ec_dev->ec_dev;
	321	struct cros_ec_rtc *cros_ec_rtc;
	322	struct rtc_time tm;
	323	int ret;
	324
	325	cros_ec_rtc = devm_kzalloc(&pdev->dev, sizeof(*cros_ec_rtc),
	326	GFP_KERNEL);
	327	if (!cros_ec_rtc)
	328	return -ENOMEM;
	329
	330	platform_set_drvdata(pdev, cros_ec_rtc);
	331	cros_ec_rtc->cros_ec = cros_ec;
	332
	333	/* Get initial time */
	334	ret = cros_ec_rtc_read_time(&pdev->dev, &tm);
	335	if (ret) {
	336	dev_err(&pdev->dev, "failed to read RTC time\n");
	337	return ret;
	338	}
	339
	340	ret = device_init_wakeup(&pdev->dev, 1);
	341	if (ret) {
	342	dev_err(&pdev->dev, "failed to initialize wakeup\n");
	343	return ret;
	344	}
	345
0e843137	346	cros_ec_rtc->rtc = devm_rtc_allocate_device(&pdev->dev);
4fc0d13f AB	347	if (IS_ERR(cros_ec_rtc->rtc))
4fc0d13f AB	348	return PTR_ERR(cros_ec_rtc->rtc);
6f2a71a3	349
0e843137 AB	350	cros_ec_rtc->rtc->ops = &cros_ec_rtc_ops;
	351	cros_ec_rtc->rtc->range_max = U32_MAX;
	352
fdcfd854	353	ret = devm_rtc_register_device(cros_ec_rtc->rtc);
0e843137 AB	354	if (ret)
	355	return ret;
	356
6f2a71a3 SB	357	/* Get RTC events from the EC. */
	358	cros_ec_rtc->notifier.notifier_call = cros_ec_rtc_event;
	359	ret = blocking_notifier_chain_register(&cros_ec->event_notifier,
	360	&cros_ec_rtc->notifier);
	361	if (ret) {
	362	dev_err(&pdev->dev, "failed to register notifier\n");
	363	return ret;
	364	}
	365
	366	return 0;
	367	}
	368
	369	static int cros_ec_rtc_remove(struct platform_device *pdev)
	370	{
	371	struct cros_ec_rtc *cros_ec_rtc = platform_get_drvdata(pdev);
	372	struct device *dev = &pdev->dev;
	373	int ret;
	374
	375	ret = blocking_notifier_chain_unregister(
	376	&cros_ec_rtc->cros_ec->event_notifier,
	377	&cros_ec_rtc->notifier);
	378	if (ret) {
	379	dev_err(dev, "failed to unregister notifier\n");
	380	return ret;
	381	}
	382
	383	return 0;
	384	}
	385
	386	static struct platform_driver cros_ec_rtc_driver = {
	387	.probe = cros_ec_rtc_probe,
	388	.remove = cros_ec_rtc_remove,
	389	.driver = {
	390	.name = DRV_NAME,
	391	.pm = &cros_ec_rtc_pm_ops,
	392	},
	393	};
	394
	395	module_platform_driver(cros_ec_rtc_driver);
	396
	397	MODULE_DESCRIPTION("RTC driver for Chrome OS ECs");
	398	MODULE_AUTHOR("Stephen Barber <smbarber@chromium.org>");
e6988d23	399	MODULE_LICENSE("GPL v2");
6f2a71a3	400	MODULE_ALIAS("platform:" DRV_NAME);