[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/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 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
	7	#include <linux/kernel.h>
	8	#include <linux/mfd/cros_ec.h>
	9	#include <linux/mfd/cros_ec_commands.h>
	10	#include <linux/module.h>
	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;
109	time64_t time;
110
111	time = rtc_tm_to_time64(tm);
112	if (time < 0 \|\| time > U32_MAX)
113	return -EINVAL;
114
115	ret = cros_ec_rtc_set(cros_ec, EC_CMD_RTC_SET_VALUE, (u32)time);
116	if (ret < 0) {
117	dev_err(dev, "error setting time: %d\n", ret);
118	return ret;
119	}
120
121	return 0;
122	}
123
124	/* Read alarm time from RTC. */
125	static int cros_ec_rtc_read_alarm(struct device dev, struct rtc_wkalrm alrm)
126	{
127	struct cros_ec_rtc *cros_ec_rtc = dev_get_drvdata(dev);
128	struct cros_ec_device *cros_ec = cros_ec_rtc->cros_ec;
129	int ret;
130	u32 current_time, alarm_offset;
131
132	/*
133	* The EC host command for getting the alarm is relative (i.e. 5
134	* seconds from now) whereas rtc_wkalrm is absolute. Get the current
135	* RTC time first so we can calculate the relative time.
136	*/
137	ret = cros_ec_rtc_get(cros_ec, EC_CMD_RTC_GET_VALUE, &current_time);
138	if (ret < 0) {
139	dev_err(dev, "error getting time: %d\n", ret);
140	return ret;
141	}
142
143	ret = cros_ec_rtc_get(cros_ec, EC_CMD_RTC_GET_ALARM, &alarm_offset);
144	if (ret < 0) {
145	dev_err(dev, "error getting alarm: %d\n", ret);
146	return ret;
147	}
148
149	rtc_time64_to_tm(current_time + alarm_offset, &alrm->time);
150
151	return 0;
152	}
153
154	/* Set the EC's RTC alarm. */
155	static int cros_ec_rtc_set_alarm(struct device dev, struct rtc_wkalrm alrm)
156	{
157	struct cros_ec_rtc *cros_ec_rtc = dev_get_drvdata(dev);
158	struct cros_ec_device *cros_ec = cros_ec_rtc->cros_ec;
159	int ret;
160	time64_t alarm_time;
161	u32 current_time, alarm_offset;
162
163	/*
164	* The EC host command for setting the alarm is relative
165	* (i.e. 5 seconds from now) whereas rtc_wkalrm is absolute.
166	* Get the current RTC time first so we can calculate the
167	* relative time.
168	*/
169	ret = cros_ec_rtc_get(cros_ec, EC_CMD_RTC_GET_VALUE, &current_time);
170	if (ret < 0) {
171	dev_err(dev, "error getting time: %d\n", ret);
172	return ret;
173	}
174
175	alarm_time = rtc_tm_to_time64(&alrm->time);
176
177	if (alarm_time < 0 \|\| alarm_time > U32_MAX)
178	return -EINVAL;
179
180	if (!alrm->enabled) {
181	/*
182	* If the alarm is being disabled, send an alarm
183	* clear command.
184	*/
185	alarm_offset = EC_RTC_ALARM_CLEAR;
186	cros_ec_rtc->saved_alarm = (u32)alarm_time;
187	} else {
188	/* Don't set an alarm in the past. */
72dd71f0 JC	189	if ((u32)alarm_time <= current_time)
	190	return -ETIME;
	191
	192	alarm_offset = (u32)alarm_time - current_time;
6f2a71a3 SB	193	}
	194
	195	ret = cros_ec_rtc_set(cros_ec, EC_CMD_RTC_SET_ALARM, alarm_offset);
	196	if (ret < 0) {
	197	dev_err(dev, "error setting alarm: %d\n", ret);
	198	return ret;
	199	}
	200
	201	return 0;
	202	}
	203
	204	static int cros_ec_rtc_alarm_irq_enable(struct device *dev,
	205	unsigned int enabled)
	206	{
	207	struct cros_ec_rtc *cros_ec_rtc = dev_get_drvdata(dev);
	208	struct cros_ec_device *cros_ec = cros_ec_rtc->cros_ec;
	209	int ret;
	210	u32 current_time, alarm_offset, alarm_value;
	211
	212	ret = cros_ec_rtc_get(cros_ec, EC_CMD_RTC_GET_VALUE, &current_time);
	213	if (ret < 0) {
	214	dev_err(dev, "error getting time: %d\n", ret);
	215	return ret;
	216	}
	217
	218	if (enabled) {
	219	/* Restore saved alarm if it's still in the future. */
	220	if (cros_ec_rtc->saved_alarm < current_time)
	221	alarm_offset = EC_RTC_ALARM_CLEAR;
	222	else
	223	alarm_offset = cros_ec_rtc->saved_alarm - current_time;
	224
	225	ret = cros_ec_rtc_set(cros_ec, EC_CMD_RTC_SET_ALARM,
	226	alarm_offset);
	227	if (ret < 0) {
	228	dev_err(dev, "error restoring alarm: %d\n", ret);
	229	return ret;
	230	}
	231	} else {
	232	/* Disable alarm, saving the old alarm value. */
	233	ret = cros_ec_rtc_get(cros_ec, EC_CMD_RTC_GET_ALARM,
	234	&alarm_offset);
	235	if (ret < 0) {
	236	dev_err(dev, "error saving alarm: %d\n", ret);
	237	return ret;
	238	}
	239
	240	alarm_value = current_time + alarm_offset;
	241
	242	/*
	243	* If the current EC alarm is already past, we don't want
	244	* to set an alarm when we go through the alarm irq enable
	245	* path.
	246	*/
	247	if (alarm_value < current_time)
	248	cros_ec_rtc->saved_alarm = EC_RTC_ALARM_CLEAR;
	249	else
	250	cros_ec_rtc->saved_alarm = alarm_value;
	251
	252	alarm_offset = EC_RTC_ALARM_CLEAR;
	253	ret = cros_ec_rtc_set(cros_ec, EC_CMD_RTC_SET_ALARM,
	254	alarm_offset);
	255	if (ret < 0) {
	256	dev_err(dev, "error disabling alarm: %d\n", ret);
257	return ret;
258	}
259	}
260
261	return 0;
262	}
263
264	static int cros_ec_rtc_event(struct notifier_block *nb,
265	unsigned long queued_during_suspend,
266	void *_notify)
267	{
268	struct cros_ec_rtc *cros_ec_rtc;
269	struct rtc_device *rtc;
270	struct cros_ec_device *cros_ec;
271	u32 host_event;
272
273	cros_ec_rtc = container_of(nb, struct cros_ec_rtc, notifier);
274	rtc = cros_ec_rtc->rtc;
275	cros_ec = cros_ec_rtc->cros_ec;
276
277	host_event = cros_ec_get_host_event(cros_ec);
278	if (host_event & EC_HOST_EVENT_MASK(EC_HOST_EVENT_RTC)) {
279	rtc_update_irq(rtc, 1, RTC_IRQF \| RTC_AF);
280	return NOTIFY_OK;
281	} else {
282	return NOTIFY_DONE;
283	}
284	}
285
286	static const struct rtc_class_ops cros_ec_rtc_ops = {
287	.read_time = cros_ec_rtc_read_time,
288	.set_time = cros_ec_rtc_set_time,
289	.read_alarm = cros_ec_rtc_read_alarm,
290	.set_alarm = cros_ec_rtc_set_alarm,
291	.alarm_irq_enable = cros_ec_rtc_alarm_irq_enable,
292	};
293
294	#ifdef CONFIG_PM_SLEEP
295	static int cros_ec_rtc_suspend(struct device *dev)
296	{
297	struct platform_device *pdev = to_platform_device(dev);
298	struct cros_ec_rtc *cros_ec_rtc = dev_get_drvdata(&pdev->dev);
299
300	if (device_may_wakeup(dev))
301	enable_irq_wake(cros_ec_rtc->cros_ec->irq);
302
303	return 0;
304	}
305
306	static int cros_ec_rtc_resume(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	disable_irq_wake(cros_ec_rtc->cros_ec->irq);
313
314	return 0;
315	}
316	#endif
317
318	static SIMPLE_DEV_PM_OPS(cros_ec_rtc_pm_ops, cros_ec_rtc_suspend,
319	cros_ec_rtc_resume);
320
321	static int cros_ec_rtc_probe(struct platform_device *pdev)
322	{
323	struct cros_ec_dev *ec_dev = dev_get_drvdata(pdev->dev.parent);
324	struct cros_ec_device *cros_ec = ec_dev->ec_dev;
325	struct cros_ec_rtc *cros_ec_rtc;
326	struct rtc_time tm;
327	int ret;
328
329	cros_ec_rtc = devm_kzalloc(&pdev->dev, sizeof(*cros_ec_rtc),
330	GFP_KERNEL);
331	if (!cros_ec_rtc)
332	return -ENOMEM;
333
334	platform_set_drvdata(pdev, cros_ec_rtc);
335	cros_ec_rtc->cros_ec = cros_ec;
336
337	/* Get initial time */
338	ret = cros_ec_rtc_read_time(&pdev->dev, &tm);
339	if (ret) {
340	dev_err(&pdev->dev, "failed to read RTC time\n");
341	return ret;
342	}
343
344	ret = device_init_wakeup(&pdev->dev, 1);
345	if (ret) {
346	dev_err(&pdev->dev, "failed to initialize wakeup\n");
347	return ret;
348	}
349
350	cros_ec_rtc->rtc = devm_rtc_device_register(&pdev->dev, DRV_NAME,
351	&cros_ec_rtc_ops,
352	THIS_MODULE);
353	if (IS_ERR(cros_ec_rtc->rtc)) {
354	ret = PTR_ERR(cros_ec_rtc->rtc);
355	dev_err(&pdev->dev, "failed to register rtc device\n");
356	return ret;
357	}
358
359	/* Get RTC events from the EC. */
360	cros_ec_rtc->notifier.notifier_call = cros_ec_rtc_event;
361	ret = blocking_notifier_chain_register(&cros_ec->event_notifier,
362	&cros_ec_rtc->notifier);
363	if (ret) {
364	dev_err(&pdev->dev, "failed to register notifier\n");
365	return ret;
366	}
367
368	return 0;
369	}
370
371	static int cros_ec_rtc_remove(struct platform_device *pdev)
372	{
373	struct cros_ec_rtc *cros_ec_rtc = platform_get_drvdata(pdev);
374	struct device *dev = &pdev->dev;
375	int ret;
376
377	ret = blocking_notifier_chain_unregister(
378	&cros_ec_rtc->cros_ec->event_notifier,
379	&cros_ec_rtc->notifier);
380	if (ret) {
381	dev_err(dev, "failed to unregister notifier\n");
382	return ret;
383	}
384
385	return 0;
386	}
387
388	static struct platform_driver cros_ec_rtc_driver = {
389	.probe = cros_ec_rtc_probe,
390	.remove = cros_ec_rtc_remove,
391	.driver = {
392	.name = DRV_NAME,
393	.pm = &cros_ec_rtc_pm_ops,
394	},
395	};
396
397	module_platform_driver(cros_ec_rtc_driver);
398
399	MODULE_DESCRIPTION("RTC driver for Chrome OS ECs");
400	MODULE_AUTHOR("Stephen Barber <smbarber@chromium.org>");
e6988d23	401	MODULE_LICENSE("GPL v2");
6f2a71a3	402	MODULE_ALIAS("platform:" DRV_NAME);