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

/*
 * RTC driver for Chrome OS Embedded Controller
 *
 * Copyright (c) 2017, Google, Inc
 *
 * Author: Stephen Barber <smbarber@chromium.org>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope 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/kernel.h>
#include <linux/mfd/cros_ec.h>
#include <linux/mfd/cros_ec_commands.h>
#include <linux/module.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;

	time = rtc_tm_to_time64(tm);
	if (time < 0 || time > U32_MAX)
		return -EINVAL;

	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))
		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))
		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_device_register(&pdev->dev, DRV_NAME,
						    &cros_ec_rtc_ops,
						    THIS_MODULE);
	if (IS_ERR(cros_ec_rtc->rtc)) {
		ret = PTR_ERR(cros_ec_rtc->rtc);
		dev_err(&pdev->dev, "failed to register rtc device\n");
		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");
MODULE_ALIAS("platform:" DRV_NAME);
Commit	Line	Data
6f2a71a3 SB	1	/*
	2	* RTC driver for Chrome OS Embedded Controller
	3	*
	4	* Copyright (c) 2017, Google, Inc
	5	*
	6	* Author: Stephen Barber <smbarber@chromium.org>
	7	*
	8	* This program is free software; you can redistribute it and/or modify it
	9	* under the terms and conditions of the GNU General Public License,
	10	* version 2, as published by the Free Software Foundation.
	11	*
	12	* This program is distributed in the hope it will be useful, but WITHOUT
	13	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	14	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	15	* more details.
	16	*/
	17
	18	#include <linux/kernel.h>
	19	#include <linux/mfd/cros_ec.h>
	20	#include <linux/mfd/cros_ec_commands.h>
	21	#include <linux/module.h>
	22	#include <linux/platform_device.h>
	23	#include <linux/rtc.h>
	24	#include <linux/slab.h>
	25
	26	#define DRV_NAME "cros-ec-rtc"
	27
	28	/**
	29	* struct cros_ec_rtc - Driver data for EC RTC
	30	*
	31	* @cros_ec: Pointer to EC device
	32	* @rtc: Pointer to RTC device
	33	* @notifier: Notifier info for responding to EC events
	34	* @saved_alarm: Alarm to restore when interrupts are reenabled
	35	*/
	36	struct cros_ec_rtc {
	37	struct cros_ec_device *cros_ec;
	38	struct rtc_device *rtc;
	39	struct notifier_block notifier;
	40	u32 saved_alarm;
	41	};
	42
	43	static int cros_ec_rtc_get(struct cros_ec_device *cros_ec, u32 command,
	44	u32 *response)
	45	{
	46	int ret;
	47	struct {
	48	struct cros_ec_command msg;
	49	struct ec_response_rtc data;
	50	} __packed msg;
	51
	52	memset(&msg, 0, sizeof(msg));
	53	msg.msg.command = command;
	54	msg.msg.insize = sizeof(msg.data);
	55
	56	ret = cros_ec_cmd_xfer_status(cros_ec, &msg.msg);
	57	if (ret < 0) {
	58	dev_err(cros_ec->dev,
	59	"error getting %s from EC: %d\n",
	60	command == EC_CMD_RTC_GET_VALUE ? "time" : "alarm",
	61	ret);
	62	return ret;
	63	}
	64
65	*response = msg.data.time;
66
67	return 0;
68	}
69
70	static int cros_ec_rtc_set(struct cros_ec_device *cros_ec, u32 command,
71	u32 param)
72	{
73	int ret = 0;
74	struct {
75	struct cros_ec_command msg;
76	struct ec_response_rtc data;
77	} __packed msg;
78
79	memset(&msg, 0, sizeof(msg));
80	msg.msg.command = command;
81	msg.msg.outsize = sizeof(msg.data);
82	msg.data.time = param;
83
84	ret = cros_ec_cmd_xfer_status(cros_ec, &msg.msg);
85	if (ret < 0) {
86	dev_err(cros_ec->dev, "error setting %s on EC: %d\n",
87	command == EC_CMD_RTC_SET_VALUE ? "time" : "alarm",
88	ret);
89	return ret;
90	}
91
92	return 0;
93	}
94
95	/* Read the current time from the EC. */
96	static int cros_ec_rtc_read_time(struct device dev, struct rtc_time tm)
97	{
98	struct cros_ec_rtc *cros_ec_rtc = dev_get_drvdata(dev);
99	struct cros_ec_device *cros_ec = cros_ec_rtc->cros_ec;
100	int ret;
101	u32 time;
102
103	ret = cros_ec_rtc_get(cros_ec, EC_CMD_RTC_GET_VALUE, &time);
104	if (ret) {
105	dev_err(dev, "error getting time: %d\n", ret);
106	return ret;
107	}
108
109	rtc_time64_to_tm(time, tm);
110
111	return 0;
112	}
113
114	/* Set the current EC time. */
115	static int cros_ec_rtc_set_time(struct device dev, struct rtc_time tm)
116	{
117	struct cros_ec_rtc *cros_ec_rtc = dev_get_drvdata(dev);
118	struct cros_ec_device *cros_ec = cros_ec_rtc->cros_ec;
119	int ret;
120	time64_t time;
121
122	time = rtc_tm_to_time64(tm);
123	if (time < 0 \|\| time > U32_MAX)
124	return -EINVAL;
125
126	ret = cros_ec_rtc_set(cros_ec, EC_CMD_RTC_SET_VALUE, (u32)time);
127	if (ret < 0) {
128	dev_err(dev, "error setting time: %d\n", ret);
129	return ret;
130	}
131
132	return 0;
133	}
134
135	/* Read alarm time from RTC. */
136	static int cros_ec_rtc_read_alarm(struct device dev, struct rtc_wkalrm alrm)
137	{
138	struct cros_ec_rtc *cros_ec_rtc = dev_get_drvdata(dev);
139	struct cros_ec_device *cros_ec = cros_ec_rtc->cros_ec;
140	int ret;
141	u32 current_time, alarm_offset;
142
143	/*
144	* The EC host command for getting the alarm is relative (i.e. 5
145	* seconds from now) whereas rtc_wkalrm is absolute. Get the current
146	* RTC time first so we can calculate the relative time.
147	*/
148	ret = cros_ec_rtc_get(cros_ec, EC_CMD_RTC_GET_VALUE, &current_time);
149	if (ret < 0) {
150	dev_err(dev, "error getting time: %d\n", ret);
151	return ret;
152	}
153
154	ret = cros_ec_rtc_get(cros_ec, EC_CMD_RTC_GET_ALARM, &alarm_offset);
155	if (ret < 0) {
156	dev_err(dev, "error getting alarm: %d\n", ret);
157	return ret;
158	}
159
160	rtc_time64_to_tm(current_time + alarm_offset, &alrm->time);
161
162	return 0;
163	}
164
165	/* Set the EC's RTC alarm. */
166	static int cros_ec_rtc_set_alarm(struct device dev, struct rtc_wkalrm alrm)
167	{
168	struct cros_ec_rtc *cros_ec_rtc = dev_get_drvdata(dev);
169	struct cros_ec_device *cros_ec = cros_ec_rtc->cros_ec;
170	int ret;
171	time64_t alarm_time;
172	u32 current_time, alarm_offset;
173
174	/*
175	* The EC host command for setting the alarm is relative
176	* (i.e. 5 seconds from now) whereas rtc_wkalrm is absolute.
177	* Get the current RTC time first so we can calculate the
178	* relative time.
179	*/
180	ret = cros_ec_rtc_get(cros_ec, EC_CMD_RTC_GET_VALUE, &current_time);
181	if (ret < 0) {
182	dev_err(dev, "error getting time: %d\n", ret);
183	return ret;
184	}
185
186	alarm_time = rtc_tm_to_time64(&alrm->time);
187
188	if (alarm_time < 0 \|\| alarm_time > U32_MAX)
189	return -EINVAL;
190
191	if (!alrm->enabled) {
192	/*
193	* If the alarm is being disabled, send an alarm
194	* clear command.
195	*/
196	alarm_offset = EC_RTC_ALARM_CLEAR;
197	cros_ec_rtc->saved_alarm = (u32)alarm_time;
198	} else {
199	/* Don't set an alarm in the past. */
72dd71f0 JC	200	if ((u32)alarm_time <= current_time)
	201	return -ETIME;
	202
	203	alarm_offset = (u32)alarm_time - current_time;
6f2a71a3 SB	204	}
	205
	206	ret = cros_ec_rtc_set(cros_ec, EC_CMD_RTC_SET_ALARM, alarm_offset);
	207	if (ret < 0) {
	208	dev_err(dev, "error setting alarm: %d\n", ret);
	209	return ret;
	210	}
	211
	212	return 0;
	213	}
	214
	215	static int cros_ec_rtc_alarm_irq_enable(struct device *dev,
	216	unsigned int enabled)
	217	{
	218	struct cros_ec_rtc *cros_ec_rtc = dev_get_drvdata(dev);
	219	struct cros_ec_device *cros_ec = cros_ec_rtc->cros_ec;
	220	int ret;
	221	u32 current_time, alarm_offset, alarm_value;
	222
	223	ret = cros_ec_rtc_get(cros_ec, EC_CMD_RTC_GET_VALUE, &current_time);
	224	if (ret < 0) {
	225	dev_err(dev, "error getting time: %d\n", ret);
	226	return ret;
	227	}
	228
	229	if (enabled) {
	230	/* Restore saved alarm if it's still in the future. */
	231	if (cros_ec_rtc->saved_alarm < current_time)
	232	alarm_offset = EC_RTC_ALARM_CLEAR;
	233	else
	234	alarm_offset = cros_ec_rtc->saved_alarm - current_time;
	235
	236	ret = cros_ec_rtc_set(cros_ec, EC_CMD_RTC_SET_ALARM,
	237	alarm_offset);
	238	if (ret < 0) {
	239	dev_err(dev, "error restoring alarm: %d\n", ret);
	240	return ret;
	241	}
	242	} else {
	243	/* Disable alarm, saving the old alarm value. */
	244	ret = cros_ec_rtc_get(cros_ec, EC_CMD_RTC_GET_ALARM,
	245	&alarm_offset);
	246	if (ret < 0) {
	247	dev_err(dev, "error saving alarm: %d\n", ret);
	248	return ret;
	249	}
	250
	251	alarm_value = current_time + alarm_offset;
	252
	253	/*
	254	* If the current EC alarm is already past, we don't want
	255	* to set an alarm when we go through the alarm irq enable
	256	* path.
	257	*/
	258	if (alarm_value < current_time)
	259	cros_ec_rtc->saved_alarm = EC_RTC_ALARM_CLEAR;
	260	else
	261	cros_ec_rtc->saved_alarm = alarm_value;
	262
	263	alarm_offset = EC_RTC_ALARM_CLEAR;
	264	ret = cros_ec_rtc_set(cros_ec, EC_CMD_RTC_SET_ALARM,
	265	alarm_offset);
	266	if (ret < 0) {
	267	dev_err(dev, "error disabling alarm: %d\n", ret);
268	return ret;
269	}
270	}
271
272	return 0;
273	}
274
275	static int cros_ec_rtc_event(struct notifier_block *nb,
276	unsigned long queued_during_suspend,
277	void *_notify)
278	{
279	struct cros_ec_rtc *cros_ec_rtc;
280	struct rtc_device *rtc;
281	struct cros_ec_device *cros_ec;
282	u32 host_event;
283
284	cros_ec_rtc = container_of(nb, struct cros_ec_rtc, notifier);
285	rtc = cros_ec_rtc->rtc;
286	cros_ec = cros_ec_rtc->cros_ec;
287
288	host_event = cros_ec_get_host_event(cros_ec);
289	if (host_event & EC_HOST_EVENT_MASK(EC_HOST_EVENT_RTC)) {
290	rtc_update_irq(rtc, 1, RTC_IRQF \| RTC_AF);
291	return NOTIFY_OK;
292	} else {
293	return NOTIFY_DONE;
294	}
295	}
296
297	static const struct rtc_class_ops cros_ec_rtc_ops = {
298	.read_time = cros_ec_rtc_read_time,
299	.set_time = cros_ec_rtc_set_time,
300	.read_alarm = cros_ec_rtc_read_alarm,
301	.set_alarm = cros_ec_rtc_set_alarm,
302	.alarm_irq_enable = cros_ec_rtc_alarm_irq_enable,
303	};
304
305	#ifdef CONFIG_PM_SLEEP
306	static int cros_ec_rtc_suspend(struct device *dev)
307	{
308	struct platform_device *pdev = to_platform_device(dev);
309	struct cros_ec_rtc *cros_ec_rtc = dev_get_drvdata(&pdev->dev);
310
311	if (device_may_wakeup(dev))
312	enable_irq_wake(cros_ec_rtc->cros_ec->irq);
313
314	return 0;
315	}
316
317	static int cros_ec_rtc_resume(struct device *dev)
318	{
319	struct platform_device *pdev = to_platform_device(dev);
320	struct cros_ec_rtc *cros_ec_rtc = dev_get_drvdata(&pdev->dev);
321
322	if (device_may_wakeup(dev))
323	disable_irq_wake(cros_ec_rtc->cros_ec->irq);
324
325	return 0;
326	}
327	#endif
328
329	static SIMPLE_DEV_PM_OPS(cros_ec_rtc_pm_ops, cros_ec_rtc_suspend,
330	cros_ec_rtc_resume);
331
332	static int cros_ec_rtc_probe(struct platform_device *pdev)
333	{
334	struct cros_ec_dev *ec_dev = dev_get_drvdata(pdev->dev.parent);
335	struct cros_ec_device *cros_ec = ec_dev->ec_dev;
336	struct cros_ec_rtc *cros_ec_rtc;
337	struct rtc_time tm;
338	int ret;
339
340	cros_ec_rtc = devm_kzalloc(&pdev->dev, sizeof(*cros_ec_rtc),
341	GFP_KERNEL);
342	if (!cros_ec_rtc)
343	return -ENOMEM;
344
345	platform_set_drvdata(pdev, cros_ec_rtc);
346	cros_ec_rtc->cros_ec = cros_ec;
347
348	/* Get initial time */
349	ret = cros_ec_rtc_read_time(&pdev->dev, &tm);
350	if (ret) {
351	dev_err(&pdev->dev, "failed to read RTC time\n");
352	return ret;
353	}
354
355	ret = device_init_wakeup(&pdev->dev, 1);
356	if (ret) {
357	dev_err(&pdev->dev, "failed to initialize wakeup\n");
358	return ret;
359	}
360
361	cros_ec_rtc->rtc = devm_rtc_device_register(&pdev->dev, DRV_NAME,
362	&cros_ec_rtc_ops,
363	THIS_MODULE);
364	if (IS_ERR(cros_ec_rtc->rtc)) {
365	ret = PTR_ERR(cros_ec_rtc->rtc);
366	dev_err(&pdev->dev, "failed to register rtc device\n");
367	return ret;
368	}
369
370	/* Get RTC events from the EC. */
371	cros_ec_rtc->notifier.notifier_call = cros_ec_rtc_event;
372	ret = blocking_notifier_chain_register(&cros_ec->event_notifier,
373	&cros_ec_rtc->notifier);
374	if (ret) {
375	dev_err(&pdev->dev, "failed to register notifier\n");
376	return ret;
377	}
378
379	return 0;
380	}
381
382	static int cros_ec_rtc_remove(struct platform_device *pdev)
383	{
384	struct cros_ec_rtc *cros_ec_rtc = platform_get_drvdata(pdev);
385	struct device *dev = &pdev->dev;
386	int ret;
387
388	ret = blocking_notifier_chain_unregister(
389	&cros_ec_rtc->cros_ec->event_notifier,
390	&cros_ec_rtc->notifier);
391	if (ret) {
392	dev_err(dev, "failed to unregister notifier\n");
393	return ret;
394	}
395
396	return 0;
397	}
398
399	static struct platform_driver cros_ec_rtc_driver = {
400	.probe = cros_ec_rtc_probe,
401	.remove = cros_ec_rtc_remove,
402	.driver = {
403	.name = DRV_NAME,
404	.pm = &cros_ec_rtc_pm_ops,
405	},
406	};
407
408	module_platform_driver(cros_ec_rtc_driver);
409
410	MODULE_DESCRIPTION("RTC driver for Chrome OS ECs");
411	MODULE_AUTHOR("Stephen Barber <smbarber@chromium.org>");
412	MODULE_LICENSE("GPL");
413	MODULE_ALIAS("platform:" DRV_NAME);