1 files changed, 409 insertions, 0 deletions
diff --git a/drivers/rtc/rtc-cros-ec.c b/drivers/rtc/rtc-cros-ec.c
new file mode 100644
index 000000000..0cd397c04
--- /dev/null
+++ b/drivers/rtc/rtc-cros-ec.c
@@ -0,0 +1,409 @@
+// 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"
+
+#define SECS_PER_DAY	(24 * 60 * 60)
+
+/**
+ * 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)
+		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;
+	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)
+		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 in %u seconds: %d\n",
+			alarm_offset, ret);
+		/*
+		 * The EC code returns -EINVAL if the alarm time is too
+		 * far in the future. Convert it to the expected error code.
+		 */
+		if (ret == -EINVAL)
+			ret = -ERANGE;
+		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;
+
+	/*
+	 * The RTC on some older Chromebooks can only handle alarms less than
+	 * 24 hours in the future. The only way to find out is to try to set an
+	 * alarm further in the future. If that fails, assume that the RTC
+	 * connected to the EC can only handle less than 24 hours of alarm
+	 * window.
+	 */
+	ret = cros_ec_rtc_set(cros_ec, EC_CMD_RTC_SET_ALARM, SECS_PER_DAY * 2);
+	if (ret == -EINVAL)
+		cros_ec_rtc->rtc->alarm_offset_max = SECS_PER_DAY - 1;
+
+	(void)cros_ec_rtc_set(cros_ec, EC_CMD_RTC_SET_ALARM,
+			      EC_RTC_ALARM_CLEAR);
+
+	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 void 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");
+}
+
+static struct platform_driver cros_ec_rtc_driver = {
+	.probe = cros_ec_rtc_probe,
+	.remove_new = 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);