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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/rtc/rtc-cros-ec.c
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/rtc/rtc-cros-ec.c')
-rw-r--r--drivers/rtc/rtc-cros-ec.c398
1 files changed, 398 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..887f5193e
--- /dev/null
+++ b/drivers/rtc/rtc-cros-ec.c
@@ -0,0 +1,398 @@
+// 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 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);