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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>
6
7#include <linux/kernel.h>
8#include <linux/module.h>
9#include <linux/platform_data/cros_ec_commands.h>
10#include <linux/platform_data/cros_ec_proto.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#define SECS_PER_DAY (24 * 60 * 60)
18
19/**
20 * struct cros_ec_rtc - Driver data for EC RTC
21 *
22 * @cros_ec: Pointer to EC device
23 * @rtc: Pointer to RTC device
24 * @notifier: Notifier info for responding to EC events
25 * @saved_alarm: Alarm to restore when interrupts are reenabled
26 */
27struct cros_ec_rtc {
28 struct cros_ec_device *cros_ec;
29 struct rtc_device *rtc;
30 struct notifier_block notifier;
31 u32 saved_alarm;
32};
33
34static int cros_ec_rtc_get(struct cros_ec_device *cros_ec, u32 command,
35 u32 *response)
36{
37 int ret;
38 struct {
39 struct cros_ec_command msg;
40 struct ec_response_rtc data;
41 } __packed msg;
42
43 memset(&msg, 0, sizeof(msg));
44 msg.msg.command = command;
45 msg.msg.insize = sizeof(msg.data);
46
47 ret = cros_ec_cmd_xfer_status(cros_ec, &msg.msg);
48 if (ret < 0)
49 return ret;
50
51 *response = msg.data.time;
52
53 return 0;
54}
55
56static int cros_ec_rtc_set(struct cros_ec_device *cros_ec, u32 command,
57 u32 param)
58{
59 int ret;
60 struct {
61 struct cros_ec_command msg;
62 struct ec_response_rtc data;
63 } __packed msg;
64
65 memset(&msg, 0, sizeof(msg));
66 msg.msg.command = command;
67 msg.msg.outsize = sizeof(msg.data);
68 msg.data.time = param;
69
70 ret = cros_ec_cmd_xfer_status(cros_ec, &msg.msg);
71 if (ret < 0)
72 return ret;
73 return 0;
74}
75
76/* Read the current time from the EC. */
77static int cros_ec_rtc_read_time(struct device *dev, struct rtc_time *tm)
78{
79 struct cros_ec_rtc *cros_ec_rtc = dev_get_drvdata(dev);
80 struct cros_ec_device *cros_ec = cros_ec_rtc->cros_ec;
81 int ret;
82 u32 time;
83
84 ret = cros_ec_rtc_get(cros_ec, EC_CMD_RTC_GET_VALUE, &time);
85 if (ret) {
86 dev_err(dev, "error getting time: %d\n", ret);
87 return ret;
88 }
89
90 rtc_time64_to_tm(time, tm);
91
92 return 0;
93}
94
95/* Set the current EC time. */
96static int cros_ec_rtc_set_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 time64_t time = rtc_tm_to_time64(tm);
102
103 ret = cros_ec_rtc_set(cros_ec, EC_CMD_RTC_SET_VALUE, (u32)time);
104 if (ret < 0) {
105 dev_err(dev, "error setting time: %d\n", ret);
106 return ret;
107 }
108
109 return 0;
110}
111
112/* Read alarm time from RTC. */
113static int cros_ec_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
114{
115 struct cros_ec_rtc *cros_ec_rtc = dev_get_drvdata(dev);
116 struct cros_ec_device *cros_ec = cros_ec_rtc->cros_ec;
117 int ret;
118 u32 current_time, alarm_offset;
119
120 /*
121 * The EC host command for getting the alarm is relative (i.e. 5
122 * seconds from now) whereas rtc_wkalrm is absolute. Get the current
123 * RTC time first so we can calculate the relative time.
124 */
125 ret = cros_ec_rtc_get(cros_ec, EC_CMD_RTC_GET_VALUE, ¤t_time);
126 if (ret < 0) {
127 dev_err(dev, "error getting time: %d\n", ret);
128 return ret;
129 }
130
131 ret = cros_ec_rtc_get(cros_ec, EC_CMD_RTC_GET_ALARM, &alarm_offset);
132 if (ret < 0) {
133 dev_err(dev, "error getting alarm: %d\n", ret);
134 return ret;
135 }
136
137 rtc_time64_to_tm(current_time + alarm_offset, &alrm->time);
138
139 return 0;
140}
141
142/* Set the EC's RTC alarm. */
143static int cros_ec_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
144{
145 struct cros_ec_rtc *cros_ec_rtc = dev_get_drvdata(dev);
146 struct cros_ec_device *cros_ec = cros_ec_rtc->cros_ec;
147 int ret;
148 time64_t alarm_time;
149 u32 current_time, alarm_offset;
150
151 /*
152 * The EC host command for setting the alarm is relative
153 * (i.e. 5 seconds from now) whereas rtc_wkalrm is absolute.
154 * Get the current RTC time first so we can calculate the
155 * relative time.
156 */
157 ret = cros_ec_rtc_get(cros_ec, EC_CMD_RTC_GET_VALUE, ¤t_time);
158 if (ret < 0) {
159 dev_err(dev, "error getting time: %d\n", ret);
160 return ret;
161 }
162
163 alarm_time = rtc_tm_to_time64(&alrm->time);
164
165 if (alarm_time < 0 || alarm_time > U32_MAX)
166 return -EINVAL;
167
168 if (!alrm->enabled) {
169 /*
170 * If the alarm is being disabled, send an alarm
171 * clear command.
172 */
173 alarm_offset = EC_RTC_ALARM_CLEAR;
174 cros_ec_rtc->saved_alarm = (u32)alarm_time;
175 } else {
176 /* Don't set an alarm in the past. */
177 if ((u32)alarm_time <= current_time)
178 return -ETIME;
179
180 alarm_offset = (u32)alarm_time - current_time;
181 }
182
183 ret = cros_ec_rtc_set(cros_ec, EC_CMD_RTC_SET_ALARM, alarm_offset);
184 if (ret < 0) {
185 if (ret == -EINVAL && alarm_offset >= SECS_PER_DAY) {
186 /*
187 * RTC chips on some older Chromebooks can only handle
188 * alarms up to 24h in the future. Try to set an alarm
189 * below that limit to avoid suspend failures.
190 */
191 ret = cros_ec_rtc_set(cros_ec, EC_CMD_RTC_SET_ALARM,
192 SECS_PER_DAY - 1);
193 }
194
195 if (ret < 0) {
196 dev_err(dev, "error setting alarm in %u seconds: %d\n",
197 alarm_offset, ret);
198 return ret;
199 }
200 }
201
202 return 0;
203}
204
205static int cros_ec_rtc_alarm_irq_enable(struct device *dev,
206 unsigned int enabled)
207{
208 struct cros_ec_rtc *cros_ec_rtc = dev_get_drvdata(dev);
209 struct cros_ec_device *cros_ec = cros_ec_rtc->cros_ec;
210 int ret;
211 u32 current_time, alarm_offset, alarm_value;
212
213 ret = cros_ec_rtc_get(cros_ec, EC_CMD_RTC_GET_VALUE, ¤t_time);
214 if (ret < 0) {
215 dev_err(dev, "error getting time: %d\n", ret);
216 return ret;
217 }
218
219 if (enabled) {
220 /* Restore saved alarm if it's still in the future. */
221 if (cros_ec_rtc->saved_alarm < current_time)
222 alarm_offset = EC_RTC_ALARM_CLEAR;
223 else
224 alarm_offset = cros_ec_rtc->saved_alarm - current_time;
225
226 ret = cros_ec_rtc_set(cros_ec, EC_CMD_RTC_SET_ALARM,
227 alarm_offset);
228 if (ret < 0) {
229 dev_err(dev, "error restoring alarm: %d\n", ret);
230 return ret;
231 }
232 } else {
233 /* Disable alarm, saving the old alarm value. */
234 ret = cros_ec_rtc_get(cros_ec, EC_CMD_RTC_GET_ALARM,
235 &alarm_offset);
236 if (ret < 0) {
237 dev_err(dev, "error saving alarm: %d\n", ret);
238 return ret;
239 }
240
241 alarm_value = current_time + alarm_offset;
242
243 /*
244 * If the current EC alarm is already past, we don't want
245 * to set an alarm when we go through the alarm irq enable
246 * path.
247 */
248 if (alarm_value < current_time)
249 cros_ec_rtc->saved_alarm = EC_RTC_ALARM_CLEAR;
250 else
251 cros_ec_rtc->saved_alarm = alarm_value;
252
253 alarm_offset = EC_RTC_ALARM_CLEAR;
254 ret = cros_ec_rtc_set(cros_ec, EC_CMD_RTC_SET_ALARM,
255 alarm_offset);
256 if (ret < 0) {
257 dev_err(dev, "error disabling alarm: %d\n", ret);
258 return ret;
259 }
260 }
261
262 return 0;
263}
264
265static int cros_ec_rtc_event(struct notifier_block *nb,
266 unsigned long queued_during_suspend,
267 void *_notify)
268{
269 struct cros_ec_rtc *cros_ec_rtc;
270 struct rtc_device *rtc;
271 struct cros_ec_device *cros_ec;
272 u32 host_event;
273
274 cros_ec_rtc = container_of(nb, struct cros_ec_rtc, notifier);
275 rtc = cros_ec_rtc->rtc;
276 cros_ec = cros_ec_rtc->cros_ec;
277
278 host_event = cros_ec_get_host_event(cros_ec);
279 if (host_event & EC_HOST_EVENT_MASK(EC_HOST_EVENT_RTC)) {
280 rtc_update_irq(rtc, 1, RTC_IRQF | RTC_AF);
281 return NOTIFY_OK;
282 } else {
283 return NOTIFY_DONE;
284 }
285}
286
287static const struct rtc_class_ops cros_ec_rtc_ops = {
288 .read_time = cros_ec_rtc_read_time,
289 .set_time = cros_ec_rtc_set_time,
290 .read_alarm = cros_ec_rtc_read_alarm,
291 .set_alarm = cros_ec_rtc_set_alarm,
292 .alarm_irq_enable = cros_ec_rtc_alarm_irq_enable,
293};
294
295#ifdef CONFIG_PM_SLEEP
296static int cros_ec_rtc_suspend(struct device *dev)
297{
298 struct platform_device *pdev = to_platform_device(dev);
299 struct cros_ec_rtc *cros_ec_rtc = dev_get_drvdata(&pdev->dev);
300
301 if (device_may_wakeup(dev))
302 return enable_irq_wake(cros_ec_rtc->cros_ec->irq);
303
304 return 0;
305}
306
307static int cros_ec_rtc_resume(struct device *dev)
308{
309 struct platform_device *pdev = to_platform_device(dev);
310 struct cros_ec_rtc *cros_ec_rtc = dev_get_drvdata(&pdev->dev);
311
312 if (device_may_wakeup(dev))
313 return disable_irq_wake(cros_ec_rtc->cros_ec->irq);
314
315 return 0;
316}
317#endif
318
319static SIMPLE_DEV_PM_OPS(cros_ec_rtc_pm_ops, cros_ec_rtc_suspend,
320 cros_ec_rtc_resume);
321
322static int cros_ec_rtc_probe(struct platform_device *pdev)
323{
324 struct cros_ec_dev *ec_dev = dev_get_drvdata(pdev->dev.parent);
325 struct cros_ec_device *cros_ec = ec_dev->ec_dev;
326 struct cros_ec_rtc *cros_ec_rtc;
327 struct rtc_time tm;
328 int ret;
329
330 cros_ec_rtc = devm_kzalloc(&pdev->dev, sizeof(*cros_ec_rtc),
331 GFP_KERNEL);
332 if (!cros_ec_rtc)
333 return -ENOMEM;
334
335 platform_set_drvdata(pdev, cros_ec_rtc);
336 cros_ec_rtc->cros_ec = cros_ec;
337
338 /* Get initial time */
339 ret = cros_ec_rtc_read_time(&pdev->dev, &tm);
340 if (ret) {
341 dev_err(&pdev->dev, "failed to read RTC time\n");
342 return ret;
343 }
344
345 ret = device_init_wakeup(&pdev->dev, 1);
346 if (ret) {
347 dev_err(&pdev->dev, "failed to initialize wakeup\n");
348 return ret;
349 }
350
351 cros_ec_rtc->rtc = devm_rtc_allocate_device(&pdev->dev);
352 if (IS_ERR(cros_ec_rtc->rtc))
353 return PTR_ERR(cros_ec_rtc->rtc);
354
355 cros_ec_rtc->rtc->ops = &cros_ec_rtc_ops;
356 cros_ec_rtc->rtc->range_max = U32_MAX;
357
358 ret = devm_rtc_register_device(cros_ec_rtc->rtc);
359 if (ret)
360 return ret;
361
362 /* Get RTC events from the EC. */
363 cros_ec_rtc->notifier.notifier_call = cros_ec_rtc_event;
364 ret = blocking_notifier_chain_register(&cros_ec->event_notifier,
365 &cros_ec_rtc->notifier);
366 if (ret) {
367 dev_err(&pdev->dev, "failed to register notifier\n");
368 return ret;
369 }
370
371 return 0;
372}
373
374static int cros_ec_rtc_remove(struct platform_device *pdev)
375{
376 struct cros_ec_rtc *cros_ec_rtc = platform_get_drvdata(pdev);
377 struct device *dev = &pdev->dev;
378 int ret;
379
380 ret = blocking_notifier_chain_unregister(
381 &cros_ec_rtc->cros_ec->event_notifier,
382 &cros_ec_rtc->notifier);
383 if (ret)
384 dev_err(dev, "failed to unregister notifier\n");
385
386 return 0;
387}
388
389static struct platform_driver cros_ec_rtc_driver = {
390 .probe = cros_ec_rtc_probe,
391 .remove = cros_ec_rtc_remove,
392 .driver = {
393 .name = DRV_NAME,
394 .pm = &cros_ec_rtc_pm_ops,
395 },
396};
397
398module_platform_driver(cros_ec_rtc_driver);
399
400MODULE_DESCRIPTION("RTC driver for Chrome OS ECs");
401MODULE_AUTHOR("Stephen Barber <smbarber@chromium.org>");
402MODULE_LICENSE("GPL v2");
403MODULE_ALIAS("platform:" DRV_NAME);
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 */
36struct 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
43static 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
70static 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. */
96static 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. */
115static 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. */
136static 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, ¤t_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. */
166static 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, ¤t_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. */
200 if ((u32)alarm_time <= current_time)
201 return -ETIME;
202
203 alarm_offset = (u32)alarm_time - current_time;
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
215static 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, ¤t_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
275static 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
297static 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
306static 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
317static 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
329static SIMPLE_DEV_PM_OPS(cros_ec_rtc_pm_ops, cros_ec_rtc_suspend,
330 cros_ec_rtc_resume);
331
332static 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
382static 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
399static 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
408module_platform_driver(cros_ec_rtc_driver);
409
410MODULE_DESCRIPTION("RTC driver for Chrome OS ECs");
411MODULE_AUTHOR("Stephen Barber <smbarber@chromium.org>");
412MODULE_LICENSE("GPL");
413MODULE_ALIAS("platform:" DRV_NAME);