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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Real Time Clock driver for Wolfson Microelectronics WM8350
4 *
5 * Copyright (C) 2007, 2008 Wolfson Microelectronics PLC.
6 *
7 * Author: Liam Girdwood
8 * linux@wolfsonmicro.com
9 */
10
11#include <linux/module.h>
12#include <linux/kernel.h>
13#include <linux/time.h>
14#include <linux/rtc.h>
15#include <linux/bcd.h>
16#include <linux/interrupt.h>
17#include <linux/ioctl.h>
18#include <linux/completion.h>
19#include <linux/mfd/wm8350/rtc.h>
20#include <linux/mfd/wm8350/core.h>
21#include <linux/delay.h>
22#include <linux/platform_device.h>
23
24#define WM8350_SET_ALM_RETRIES 5
25#define WM8350_SET_TIME_RETRIES 5
26#define WM8350_GET_TIME_RETRIES 5
27
28/*
29 * Read current time and date in RTC
30 */
31static int wm8350_rtc_readtime(struct device *dev, struct rtc_time *tm)
32{
33 struct wm8350 *wm8350 = dev_get_drvdata(dev);
34 u16 time1[4], time2[4];
35 int retries = WM8350_GET_TIME_RETRIES, ret;
36
37 /*
38 * Read the time twice and compare.
39 * If time1 == time2, then time is valid else retry.
40 */
41 do {
42 ret = wm8350_block_read(wm8350, WM8350_RTC_SECONDS_MINUTES,
43 4, time1);
44 if (ret < 0)
45 return ret;
46 ret = wm8350_block_read(wm8350, WM8350_RTC_SECONDS_MINUTES,
47 4, time2);
48 if (ret < 0)
49 return ret;
50
51 if (memcmp(time1, time2, sizeof(time1)) == 0) {
52 tm->tm_sec = time1[0] & WM8350_RTC_SECS_MASK;
53
54 tm->tm_min = (time1[0] & WM8350_RTC_MINS_MASK)
55 >> WM8350_RTC_MINS_SHIFT;
56
57 tm->tm_hour = time1[1] & WM8350_RTC_HRS_MASK;
58
59 tm->tm_wday = ((time1[1] >> WM8350_RTC_DAY_SHIFT)
60 & 0x7) - 1;
61
62 tm->tm_mon = ((time1[2] & WM8350_RTC_MTH_MASK)
63 >> WM8350_RTC_MTH_SHIFT) - 1;
64
65 tm->tm_mday = (time1[2] & WM8350_RTC_DATE_MASK);
66
67 tm->tm_year = ((time1[3] & WM8350_RTC_YHUNDREDS_MASK)
68 >> WM8350_RTC_YHUNDREDS_SHIFT) * 100;
69 tm->tm_year += time1[3] & WM8350_RTC_YUNITS_MASK;
70
71 tm->tm_yday = rtc_year_days(tm->tm_mday, tm->tm_mon,
72 tm->tm_year);
73 tm->tm_year -= 1900;
74
75 dev_dbg(dev, "Read (%d left): %04x %04x %04x %04x\n",
76 retries,
77 time1[0], time1[1], time1[2], time1[3]);
78
79 return 0;
80 }
81 } while (retries--);
82
83 dev_err(dev, "timed out reading RTC time\n");
84 return -EIO;
85}
86
87/*
88 * Set current time and date in RTC
89 */
90static int wm8350_rtc_settime(struct device *dev, struct rtc_time *tm)
91{
92 struct wm8350 *wm8350 = dev_get_drvdata(dev);
93 u16 time[4];
94 u16 rtc_ctrl;
95 int ret, retries = WM8350_SET_TIME_RETRIES;
96
97 time[0] = tm->tm_sec;
98 time[0] |= tm->tm_min << WM8350_RTC_MINS_SHIFT;
99 time[1] = tm->tm_hour;
100 time[1] |= (tm->tm_wday + 1) << WM8350_RTC_DAY_SHIFT;
101 time[2] = tm->tm_mday;
102 time[2] |= (tm->tm_mon + 1) << WM8350_RTC_MTH_SHIFT;
103 time[3] = ((tm->tm_year + 1900) / 100) << WM8350_RTC_YHUNDREDS_SHIFT;
104 time[3] |= (tm->tm_year + 1900) % 100;
105
106 dev_dbg(dev, "Setting: %04x %04x %04x %04x\n",
107 time[0], time[1], time[2], time[3]);
108
109 /* Set RTC_SET to stop the clock */
110 ret = wm8350_set_bits(wm8350, WM8350_RTC_TIME_CONTROL, WM8350_RTC_SET);
111 if (ret < 0)
112 return ret;
113
114 /* Wait until confirmation of stopping */
115 do {
116 rtc_ctrl = wm8350_reg_read(wm8350, WM8350_RTC_TIME_CONTROL);
117 schedule_timeout_uninterruptible(msecs_to_jiffies(1));
118 } while (--retries && !(rtc_ctrl & WM8350_RTC_STS));
119
120 if (!retries) {
121 dev_err(dev, "timed out on set confirmation\n");
122 return -EIO;
123 }
124
125 /* Write time to RTC */
126 ret = wm8350_block_write(wm8350, WM8350_RTC_SECONDS_MINUTES, 4, time);
127 if (ret < 0)
128 return ret;
129
130 /* Clear RTC_SET to start the clock */
131 ret = wm8350_clear_bits(wm8350, WM8350_RTC_TIME_CONTROL,
132 WM8350_RTC_SET);
133 return ret;
134}
135
136/*
137 * Read alarm time and date in RTC
138 */
139static int wm8350_rtc_readalarm(struct device *dev, struct rtc_wkalrm *alrm)
140{
141 struct wm8350 *wm8350 = dev_get_drvdata(dev);
142 struct rtc_time *tm = &alrm->time;
143 u16 time[4];
144 int ret;
145
146 ret = wm8350_block_read(wm8350, WM8350_ALARM_SECONDS_MINUTES, 4, time);
147 if (ret < 0)
148 return ret;
149
150 tm->tm_sec = time[0] & WM8350_RTC_ALMSECS_MASK;
151 if (tm->tm_sec == WM8350_RTC_ALMSECS_MASK)
152 tm->tm_sec = -1;
153
154 tm->tm_min = time[0] & WM8350_RTC_ALMMINS_MASK;
155 if (tm->tm_min == WM8350_RTC_ALMMINS_MASK)
156 tm->tm_min = -1;
157 else
158 tm->tm_min >>= WM8350_RTC_ALMMINS_SHIFT;
159
160 tm->tm_hour = time[1] & WM8350_RTC_ALMHRS_MASK;
161 if (tm->tm_hour == WM8350_RTC_ALMHRS_MASK)
162 tm->tm_hour = -1;
163
164 tm->tm_wday = ((time[1] >> WM8350_RTC_ALMDAY_SHIFT) & 0x7) - 1;
165 if (tm->tm_wday > 7)
166 tm->tm_wday = -1;
167
168 tm->tm_mon = time[2] & WM8350_RTC_ALMMTH_MASK;
169 if (tm->tm_mon == WM8350_RTC_ALMMTH_MASK)
170 tm->tm_mon = -1;
171 else
172 tm->tm_mon = (tm->tm_mon >> WM8350_RTC_ALMMTH_SHIFT) - 1;
173
174 tm->tm_mday = (time[2] & WM8350_RTC_ALMDATE_MASK);
175 if (tm->tm_mday == WM8350_RTC_ALMDATE_MASK)
176 tm->tm_mday = -1;
177
178 tm->tm_year = -1;
179
180 alrm->enabled = !(time[3] & WM8350_RTC_ALMSTS);
181
182 return 0;
183}
184
185static int wm8350_rtc_stop_alarm(struct wm8350 *wm8350)
186{
187 int retries = WM8350_SET_ALM_RETRIES;
188 u16 rtc_ctrl;
189 int ret;
190
191 /* Set RTC_SET to stop the clock */
192 ret = wm8350_set_bits(wm8350, WM8350_RTC_TIME_CONTROL,
193 WM8350_RTC_ALMSET);
194 if (ret < 0)
195 return ret;
196
197 /* Wait until confirmation of stopping */
198 do {
199 rtc_ctrl = wm8350_reg_read(wm8350, WM8350_RTC_TIME_CONTROL);
200 schedule_timeout_uninterruptible(msecs_to_jiffies(1));
201 } while (retries-- && !(rtc_ctrl & WM8350_RTC_ALMSTS));
202
203 if (!(rtc_ctrl & WM8350_RTC_ALMSTS))
204 return -ETIMEDOUT;
205
206 return 0;
207}
208
209static int wm8350_rtc_start_alarm(struct wm8350 *wm8350)
210{
211 int ret;
212 int retries = WM8350_SET_ALM_RETRIES;
213 u16 rtc_ctrl;
214
215 ret = wm8350_clear_bits(wm8350, WM8350_RTC_TIME_CONTROL,
216 WM8350_RTC_ALMSET);
217 if (ret < 0)
218 return ret;
219
220 /* Wait until confirmation */
221 do {
222 rtc_ctrl = wm8350_reg_read(wm8350, WM8350_RTC_TIME_CONTROL);
223 schedule_timeout_uninterruptible(msecs_to_jiffies(1));
224 } while (retries-- && rtc_ctrl & WM8350_RTC_ALMSTS);
225
226 if (rtc_ctrl & WM8350_RTC_ALMSTS)
227 return -ETIMEDOUT;
228
229 return 0;
230}
231
232static int wm8350_rtc_alarm_irq_enable(struct device *dev,
233 unsigned int enabled)
234{
235 struct wm8350 *wm8350 = dev_get_drvdata(dev);
236
237 if (enabled)
238 return wm8350_rtc_start_alarm(wm8350);
239 else
240 return wm8350_rtc_stop_alarm(wm8350);
241}
242
243static int wm8350_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
244{
245 struct wm8350 *wm8350 = dev_get_drvdata(dev);
246 struct rtc_time *tm = &alrm->time;
247 u16 time[3];
248 int ret;
249
250 memset(time, 0, sizeof(time));
251
252 if (tm->tm_sec != -1)
253 time[0] |= tm->tm_sec;
254 else
255 time[0] |= WM8350_RTC_ALMSECS_MASK;
256
257 if (tm->tm_min != -1)
258 time[0] |= tm->tm_min << WM8350_RTC_ALMMINS_SHIFT;
259 else
260 time[0] |= WM8350_RTC_ALMMINS_MASK;
261
262 if (tm->tm_hour != -1)
263 time[1] |= tm->tm_hour;
264 else
265 time[1] |= WM8350_RTC_ALMHRS_MASK;
266
267 if (tm->tm_wday != -1)
268 time[1] |= (tm->tm_wday + 1) << WM8350_RTC_ALMDAY_SHIFT;
269 else
270 time[1] |= WM8350_RTC_ALMDAY_MASK;
271
272 if (tm->tm_mday != -1)
273 time[2] |= tm->tm_mday;
274 else
275 time[2] |= WM8350_RTC_ALMDATE_MASK;
276
277 if (tm->tm_mon != -1)
278 time[2] |= (tm->tm_mon + 1) << WM8350_RTC_ALMMTH_SHIFT;
279 else
280 time[2] |= WM8350_RTC_ALMMTH_MASK;
281
282 ret = wm8350_rtc_stop_alarm(wm8350);
283 if (ret < 0)
284 return ret;
285
286 /* Write time to RTC */
287 ret = wm8350_block_write(wm8350, WM8350_ALARM_SECONDS_MINUTES,
288 3, time);
289 if (ret < 0)
290 return ret;
291
292 if (alrm->enabled)
293 ret = wm8350_rtc_start_alarm(wm8350);
294
295 return ret;
296}
297
298static irqreturn_t wm8350_rtc_alarm_handler(int irq, void *data)
299{
300 struct wm8350 *wm8350 = data;
301 struct rtc_device *rtc = wm8350->rtc.rtc;
302 int ret;
303
304 rtc_update_irq(rtc, 1, RTC_IRQF | RTC_AF);
305
306 /* Make it one shot */
307 ret = wm8350_set_bits(wm8350, WM8350_RTC_TIME_CONTROL,
308 WM8350_RTC_ALMSET);
309 if (ret != 0) {
310 dev_err(&(wm8350->rtc.pdev->dev),
311 "Failed to disable alarm: %d\n", ret);
312 }
313
314 return IRQ_HANDLED;
315}
316
317static irqreturn_t wm8350_rtc_update_handler(int irq, void *data)
318{
319 struct wm8350 *wm8350 = data;
320 struct rtc_device *rtc = wm8350->rtc.rtc;
321
322 rtc_update_irq(rtc, 1, RTC_IRQF | RTC_UF);
323
324 return IRQ_HANDLED;
325}
326
327static const struct rtc_class_ops wm8350_rtc_ops = {
328 .read_time = wm8350_rtc_readtime,
329 .set_time = wm8350_rtc_settime,
330 .read_alarm = wm8350_rtc_readalarm,
331 .set_alarm = wm8350_rtc_setalarm,
332 .alarm_irq_enable = wm8350_rtc_alarm_irq_enable,
333};
334
335#ifdef CONFIG_PM_SLEEP
336static int wm8350_rtc_suspend(struct device *dev)
337{
338 struct wm8350 *wm8350 = dev_get_drvdata(dev);
339 int ret = 0;
340 u16 reg;
341
342 reg = wm8350_reg_read(wm8350, WM8350_RTC_TIME_CONTROL);
343
344 if (device_may_wakeup(&wm8350->rtc.pdev->dev) &&
345 reg & WM8350_RTC_ALMSTS) {
346 ret = wm8350_rtc_stop_alarm(wm8350);
347 if (ret != 0)
348 dev_err(dev, "Failed to stop RTC alarm: %d\n", ret);
349 }
350
351 return ret;
352}
353
354static int wm8350_rtc_resume(struct device *dev)
355{
356 struct wm8350 *wm8350 = dev_get_drvdata(dev);
357 int ret;
358
359 if (wm8350->rtc.alarm_enabled) {
360 ret = wm8350_rtc_start_alarm(wm8350);
361 if (ret != 0)
362 dev_err(dev, "Failed to restart RTC alarm: %d\n", ret);
363 }
364
365 return 0;
366}
367#endif
368
369static int wm8350_rtc_probe(struct platform_device *pdev)
370{
371 struct wm8350 *wm8350 = platform_get_drvdata(pdev);
372 struct wm8350_rtc *wm_rtc = &wm8350->rtc;
373 int ret = 0;
374 u16 timectl, power5;
375
376 timectl = wm8350_reg_read(wm8350, WM8350_RTC_TIME_CONTROL);
377 if (timectl & WM8350_RTC_BCD) {
378 dev_err(&pdev->dev, "RTC BCD mode not supported\n");
379 return -EINVAL;
380 }
381 if (timectl & WM8350_RTC_12HR) {
382 dev_err(&pdev->dev, "RTC 12 hour mode not supported\n");
383 return -EINVAL;
384 }
385
386 /* enable the RTC if it's not already enabled */
387 power5 = wm8350_reg_read(wm8350, WM8350_POWER_MGMT_5);
388 if (!(power5 & WM8350_RTC_TICK_ENA)) {
389 dev_info(wm8350->dev, "Starting RTC\n");
390
391 wm8350_reg_unlock(wm8350);
392
393 ret = wm8350_set_bits(wm8350, WM8350_POWER_MGMT_5,
394 WM8350_RTC_TICK_ENA);
395 if (ret < 0) {
396 dev_err(&pdev->dev, "failed to enable RTC: %d\n", ret);
397 return ret;
398 }
399
400 wm8350_reg_lock(wm8350);
401 }
402
403 if (timectl & WM8350_RTC_STS) {
404 int retries;
405
406 ret = wm8350_clear_bits(wm8350, WM8350_RTC_TIME_CONTROL,
407 WM8350_RTC_SET);
408 if (ret < 0) {
409 dev_err(&pdev->dev, "failed to start: %d\n", ret);
410 return ret;
411 }
412
413 retries = WM8350_SET_TIME_RETRIES;
414 do {
415 timectl = wm8350_reg_read(wm8350,
416 WM8350_RTC_TIME_CONTROL);
417 } while (timectl & WM8350_RTC_STS && --retries);
418
419 if (retries == 0) {
420 dev_err(&pdev->dev, "failed to start: timeout\n");
421 return -ENODEV;
422 }
423 }
424
425 device_init_wakeup(&pdev->dev, 1);
426
427 wm_rtc->rtc = devm_rtc_device_register(&pdev->dev, "wm8350",
428 &wm8350_rtc_ops, THIS_MODULE);
429 if (IS_ERR(wm_rtc->rtc)) {
430 ret = PTR_ERR(wm_rtc->rtc);
431 dev_err(&pdev->dev, "failed to register RTC: %d\n", ret);
432 return ret;
433 }
434
435 ret = wm8350_register_irq(wm8350, WM8350_IRQ_RTC_SEC,
436 wm8350_rtc_update_handler, 0,
437 "RTC Seconds", wm8350);
438 if (ret)
439 return ret;
440
441 wm8350_mask_irq(wm8350, WM8350_IRQ_RTC_SEC);
442
443 ret = wm8350_register_irq(wm8350, WM8350_IRQ_RTC_ALM,
444 wm8350_rtc_alarm_handler, 0,
445 "RTC Alarm", wm8350);
446 if (ret) {
447 wm8350_free_irq(wm8350, WM8350_IRQ_RTC_SEC, wm8350);
448 return ret;
449 }
450
451 return 0;
452}
453
454static int wm8350_rtc_remove(struct platform_device *pdev)
455{
456 struct wm8350 *wm8350 = platform_get_drvdata(pdev);
457
458 wm8350_free_irq(wm8350, WM8350_IRQ_RTC_SEC, wm8350);
459 wm8350_free_irq(wm8350, WM8350_IRQ_RTC_ALM, wm8350);
460
461 return 0;
462}
463
464static SIMPLE_DEV_PM_OPS(wm8350_rtc_pm_ops, wm8350_rtc_suspend,
465 wm8350_rtc_resume);
466
467static struct platform_driver wm8350_rtc_driver = {
468 .probe = wm8350_rtc_probe,
469 .remove = wm8350_rtc_remove,
470 .driver = {
471 .name = "wm8350-rtc",
472 .pm = &wm8350_rtc_pm_ops,
473 },
474};
475
476module_platform_driver(wm8350_rtc_driver);
477
478MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
479MODULE_DESCRIPTION("RTC driver for the WM8350");
480MODULE_LICENSE("GPL");
481MODULE_ALIAS("platform:wm8350-rtc");
1/*
2 * Real Time Clock driver for Wolfson Microelectronics WM8350
3 *
4 * Copyright (C) 2007, 2008 Wolfson Microelectronics PLC.
5 *
6 * Author: Liam Girdwood
7 * linux@wolfsonmicro.com
8 *
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; either version 2 of the License, or (at your
12 * option) any later version.
13 *
14 */
15
16#include <linux/module.h>
17#include <linux/kernel.h>
18#include <linux/time.h>
19#include <linux/rtc.h>
20#include <linux/bcd.h>
21#include <linux/interrupt.h>
22#include <linux/ioctl.h>
23#include <linux/completion.h>
24#include <linux/mfd/wm8350/rtc.h>
25#include <linux/mfd/wm8350/core.h>
26#include <linux/delay.h>
27#include <linux/platform_device.h>
28
29#define WM8350_SET_ALM_RETRIES 5
30#define WM8350_SET_TIME_RETRIES 5
31#define WM8350_GET_TIME_RETRIES 5
32
33#define to_wm8350_from_rtc_dev(d) container_of(d, struct wm8350, rtc.pdev.dev)
34
35/*
36 * Read current time and date in RTC
37 */
38static int wm8350_rtc_readtime(struct device *dev, struct rtc_time *tm)
39{
40 struct wm8350 *wm8350 = dev_get_drvdata(dev);
41 u16 time1[4], time2[4];
42 int retries = WM8350_GET_TIME_RETRIES, ret;
43
44 /*
45 * Read the time twice and compare.
46 * If time1 == time2, then time is valid else retry.
47 */
48 do {
49 ret = wm8350_block_read(wm8350, WM8350_RTC_SECONDS_MINUTES,
50 4, time1);
51 if (ret < 0)
52 return ret;
53 ret = wm8350_block_read(wm8350, WM8350_RTC_SECONDS_MINUTES,
54 4, time2);
55 if (ret < 0)
56 return ret;
57
58 if (memcmp(time1, time2, sizeof(time1)) == 0) {
59 tm->tm_sec = time1[0] & WM8350_RTC_SECS_MASK;
60
61 tm->tm_min = (time1[0] & WM8350_RTC_MINS_MASK)
62 >> WM8350_RTC_MINS_SHIFT;
63
64 tm->tm_hour = time1[1] & WM8350_RTC_HRS_MASK;
65
66 tm->tm_wday = ((time1[1] >> WM8350_RTC_DAY_SHIFT)
67 & 0x7) - 1;
68
69 tm->tm_mon = ((time1[2] & WM8350_RTC_MTH_MASK)
70 >> WM8350_RTC_MTH_SHIFT) - 1;
71
72 tm->tm_mday = (time1[2] & WM8350_RTC_DATE_MASK);
73
74 tm->tm_year = ((time1[3] & WM8350_RTC_YHUNDREDS_MASK)
75 >> WM8350_RTC_YHUNDREDS_SHIFT) * 100;
76 tm->tm_year += time1[3] & WM8350_RTC_YUNITS_MASK;
77
78 tm->tm_yday = rtc_year_days(tm->tm_mday, tm->tm_mon,
79 tm->tm_year);
80 tm->tm_year -= 1900;
81
82 dev_dbg(dev, "Read (%d left): %04x %04x %04x %04x\n",
83 retries,
84 time1[0], time1[1], time1[2], time1[3]);
85
86 return 0;
87 }
88 } while (retries--);
89
90 dev_err(dev, "timed out reading RTC time\n");
91 return -EIO;
92}
93
94/*
95 * Set current time and date in RTC
96 */
97static int wm8350_rtc_settime(struct device *dev, struct rtc_time *tm)
98{
99 struct wm8350 *wm8350 = dev_get_drvdata(dev);
100 u16 time[4];
101 u16 rtc_ctrl;
102 int ret, retries = WM8350_SET_TIME_RETRIES;
103
104 time[0] = tm->tm_sec;
105 time[0] |= tm->tm_min << WM8350_RTC_MINS_SHIFT;
106 time[1] = tm->tm_hour;
107 time[1] |= (tm->tm_wday + 1) << WM8350_RTC_DAY_SHIFT;
108 time[2] = tm->tm_mday;
109 time[2] |= (tm->tm_mon + 1) << WM8350_RTC_MTH_SHIFT;
110 time[3] = ((tm->tm_year + 1900) / 100) << WM8350_RTC_YHUNDREDS_SHIFT;
111 time[3] |= (tm->tm_year + 1900) % 100;
112
113 dev_dbg(dev, "Setting: %04x %04x %04x %04x\n",
114 time[0], time[1], time[2], time[3]);
115
116 /* Set RTC_SET to stop the clock */
117 ret = wm8350_set_bits(wm8350, WM8350_RTC_TIME_CONTROL, WM8350_RTC_SET);
118 if (ret < 0)
119 return ret;
120
121 /* Wait until confirmation of stopping */
122 do {
123 rtc_ctrl = wm8350_reg_read(wm8350, WM8350_RTC_TIME_CONTROL);
124 schedule_timeout_uninterruptible(msecs_to_jiffies(1));
125 } while (--retries && !(rtc_ctrl & WM8350_RTC_STS));
126
127 if (!retries) {
128 dev_err(dev, "timed out on set confirmation\n");
129 return -EIO;
130 }
131
132 /* Write time to RTC */
133 ret = wm8350_block_write(wm8350, WM8350_RTC_SECONDS_MINUTES, 4, time);
134 if (ret < 0)
135 return ret;
136
137 /* Clear RTC_SET to start the clock */
138 ret = wm8350_clear_bits(wm8350, WM8350_RTC_TIME_CONTROL,
139 WM8350_RTC_SET);
140 return ret;
141}
142
143/*
144 * Read alarm time and date in RTC
145 */
146static int wm8350_rtc_readalarm(struct device *dev, struct rtc_wkalrm *alrm)
147{
148 struct wm8350 *wm8350 = dev_get_drvdata(dev);
149 struct rtc_time *tm = &alrm->time;
150 u16 time[4];
151 int ret;
152
153 ret = wm8350_block_read(wm8350, WM8350_ALARM_SECONDS_MINUTES, 4, time);
154 if (ret < 0)
155 return ret;
156
157 tm->tm_sec = time[0] & WM8350_RTC_ALMSECS_MASK;
158 if (tm->tm_sec == WM8350_RTC_ALMSECS_MASK)
159 tm->tm_sec = -1;
160
161 tm->tm_min = time[0] & WM8350_RTC_ALMMINS_MASK;
162 if (tm->tm_min == WM8350_RTC_ALMMINS_MASK)
163 tm->tm_min = -1;
164 else
165 tm->tm_min >>= WM8350_RTC_ALMMINS_SHIFT;
166
167 tm->tm_hour = time[1] & WM8350_RTC_ALMHRS_MASK;
168 if (tm->tm_hour == WM8350_RTC_ALMHRS_MASK)
169 tm->tm_hour = -1;
170
171 tm->tm_wday = ((time[1] >> WM8350_RTC_ALMDAY_SHIFT) & 0x7) - 1;
172 if (tm->tm_wday > 7)
173 tm->tm_wday = -1;
174
175 tm->tm_mon = time[2] & WM8350_RTC_ALMMTH_MASK;
176 if (tm->tm_mon == WM8350_RTC_ALMMTH_MASK)
177 tm->tm_mon = -1;
178 else
179 tm->tm_mon = (tm->tm_mon >> WM8350_RTC_ALMMTH_SHIFT) - 1;
180
181 tm->tm_mday = (time[2] & WM8350_RTC_ALMDATE_MASK);
182 if (tm->tm_mday == WM8350_RTC_ALMDATE_MASK)
183 tm->tm_mday = -1;
184
185 tm->tm_year = -1;
186
187 alrm->enabled = !(time[3] & WM8350_RTC_ALMSTS);
188
189 return 0;
190}
191
192static int wm8350_rtc_stop_alarm(struct wm8350 *wm8350)
193{
194 int retries = WM8350_SET_ALM_RETRIES;
195 u16 rtc_ctrl;
196 int ret;
197
198 /* Set RTC_SET to stop the clock */
199 ret = wm8350_set_bits(wm8350, WM8350_RTC_TIME_CONTROL,
200 WM8350_RTC_ALMSET);
201 if (ret < 0)
202 return ret;
203
204 /* Wait until confirmation of stopping */
205 do {
206 rtc_ctrl = wm8350_reg_read(wm8350, WM8350_RTC_TIME_CONTROL);
207 schedule_timeout_uninterruptible(msecs_to_jiffies(1));
208 } while (retries-- && !(rtc_ctrl & WM8350_RTC_ALMSTS));
209
210 if (!(rtc_ctrl & WM8350_RTC_ALMSTS))
211 return -ETIMEDOUT;
212
213 return 0;
214}
215
216static int wm8350_rtc_start_alarm(struct wm8350 *wm8350)
217{
218 int ret;
219 int retries = WM8350_SET_ALM_RETRIES;
220 u16 rtc_ctrl;
221
222 ret = wm8350_clear_bits(wm8350, WM8350_RTC_TIME_CONTROL,
223 WM8350_RTC_ALMSET);
224 if (ret < 0)
225 return ret;
226
227 /* Wait until confirmation */
228 do {
229 rtc_ctrl = wm8350_reg_read(wm8350, WM8350_RTC_TIME_CONTROL);
230 schedule_timeout_uninterruptible(msecs_to_jiffies(1));
231 } while (retries-- && rtc_ctrl & WM8350_RTC_ALMSTS);
232
233 if (rtc_ctrl & WM8350_RTC_ALMSTS)
234 return -ETIMEDOUT;
235
236 return 0;
237}
238
239static int wm8350_rtc_alarm_irq_enable(struct device *dev,
240 unsigned int enabled)
241{
242 struct wm8350 *wm8350 = dev_get_drvdata(dev);
243
244 if (enabled)
245 return wm8350_rtc_start_alarm(wm8350);
246 else
247 return wm8350_rtc_stop_alarm(wm8350);
248}
249
250static int wm8350_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
251{
252 struct wm8350 *wm8350 = dev_get_drvdata(dev);
253 struct rtc_time *tm = &alrm->time;
254 u16 time[3];
255 int ret;
256
257 memset(time, 0, sizeof(time));
258
259 if (tm->tm_sec != -1)
260 time[0] |= tm->tm_sec;
261 else
262 time[0] |= WM8350_RTC_ALMSECS_MASK;
263
264 if (tm->tm_min != -1)
265 time[0] |= tm->tm_min << WM8350_RTC_ALMMINS_SHIFT;
266 else
267 time[0] |= WM8350_RTC_ALMMINS_MASK;
268
269 if (tm->tm_hour != -1)
270 time[1] |= tm->tm_hour;
271 else
272 time[1] |= WM8350_RTC_ALMHRS_MASK;
273
274 if (tm->tm_wday != -1)
275 time[1] |= (tm->tm_wday + 1) << WM8350_RTC_ALMDAY_SHIFT;
276 else
277 time[1] |= WM8350_RTC_ALMDAY_MASK;
278
279 if (tm->tm_mday != -1)
280 time[2] |= tm->tm_mday;
281 else
282 time[2] |= WM8350_RTC_ALMDATE_MASK;
283
284 if (tm->tm_mon != -1)
285 time[2] |= (tm->tm_mon + 1) << WM8350_RTC_ALMMTH_SHIFT;
286 else
287 time[2] |= WM8350_RTC_ALMMTH_MASK;
288
289 ret = wm8350_rtc_stop_alarm(wm8350);
290 if (ret < 0)
291 return ret;
292
293 /* Write time to RTC */
294 ret = wm8350_block_write(wm8350, WM8350_ALARM_SECONDS_MINUTES,
295 3, time);
296 if (ret < 0)
297 return ret;
298
299 if (alrm->enabled)
300 ret = wm8350_rtc_start_alarm(wm8350);
301
302 return ret;
303}
304
305static irqreturn_t wm8350_rtc_alarm_handler(int irq, void *data)
306{
307 struct wm8350 *wm8350 = data;
308 struct rtc_device *rtc = wm8350->rtc.rtc;
309 int ret;
310
311 rtc_update_irq(rtc, 1, RTC_IRQF | RTC_AF);
312
313 /* Make it one shot */
314 ret = wm8350_set_bits(wm8350, WM8350_RTC_TIME_CONTROL,
315 WM8350_RTC_ALMSET);
316 if (ret != 0) {
317 dev_err(&(wm8350->rtc.pdev->dev),
318 "Failed to disable alarm: %d\n", ret);
319 }
320
321 return IRQ_HANDLED;
322}
323
324static irqreturn_t wm8350_rtc_update_handler(int irq, void *data)
325{
326 struct wm8350 *wm8350 = data;
327 struct rtc_device *rtc = wm8350->rtc.rtc;
328
329 rtc_update_irq(rtc, 1, RTC_IRQF | RTC_UF);
330
331 return IRQ_HANDLED;
332}
333
334static const struct rtc_class_ops wm8350_rtc_ops = {
335 .read_time = wm8350_rtc_readtime,
336 .set_time = wm8350_rtc_settime,
337 .read_alarm = wm8350_rtc_readalarm,
338 .set_alarm = wm8350_rtc_setalarm,
339 .alarm_irq_enable = wm8350_rtc_alarm_irq_enable,
340};
341
342#ifdef CONFIG_PM
343static int wm8350_rtc_suspend(struct device *dev)
344{
345 struct platform_device *pdev = to_platform_device(dev);
346 struct wm8350 *wm8350 = dev_get_drvdata(&pdev->dev);
347 int ret = 0;
348 u16 reg;
349
350 reg = wm8350_reg_read(wm8350, WM8350_RTC_TIME_CONTROL);
351
352 if (device_may_wakeup(&wm8350->rtc.pdev->dev) &&
353 reg & WM8350_RTC_ALMSTS) {
354 ret = wm8350_rtc_stop_alarm(wm8350);
355 if (ret != 0)
356 dev_err(&pdev->dev, "Failed to stop RTC alarm: %d\n",
357 ret);
358 }
359
360 return ret;
361}
362
363static int wm8350_rtc_resume(struct device *dev)
364{
365 struct platform_device *pdev = to_platform_device(dev);
366 struct wm8350 *wm8350 = dev_get_drvdata(&pdev->dev);
367 int ret;
368
369 if (wm8350->rtc.alarm_enabled) {
370 ret = wm8350_rtc_start_alarm(wm8350);
371 if (ret != 0)
372 dev_err(&pdev->dev,
373 "Failed to restart RTC alarm: %d\n", ret);
374 }
375
376 return 0;
377}
378
379#else
380#define wm8350_rtc_suspend NULL
381#define wm8350_rtc_resume NULL
382#endif
383
384static int wm8350_rtc_probe(struct platform_device *pdev)
385{
386 struct wm8350 *wm8350 = platform_get_drvdata(pdev);
387 struct wm8350_rtc *wm_rtc = &wm8350->rtc;
388 int ret = 0;
389 u16 timectl, power5;
390
391 timectl = wm8350_reg_read(wm8350, WM8350_RTC_TIME_CONTROL);
392 if (timectl & WM8350_RTC_BCD) {
393 dev_err(&pdev->dev, "RTC BCD mode not supported\n");
394 return -EINVAL;
395 }
396 if (timectl & WM8350_RTC_12HR) {
397 dev_err(&pdev->dev, "RTC 12 hour mode not supported\n");
398 return -EINVAL;
399 }
400
401 /* enable the RTC if it's not already enabled */
402 power5 = wm8350_reg_read(wm8350, WM8350_POWER_MGMT_5);
403 if (!(power5 & WM8350_RTC_TICK_ENA)) {
404 dev_info(wm8350->dev, "Starting RTC\n");
405
406 wm8350_reg_unlock(wm8350);
407
408 ret = wm8350_set_bits(wm8350, WM8350_POWER_MGMT_5,
409 WM8350_RTC_TICK_ENA);
410 if (ret < 0) {
411 dev_err(&pdev->dev, "failed to enable RTC: %d\n", ret);
412 return ret;
413 }
414
415 wm8350_reg_lock(wm8350);
416 }
417
418 if (timectl & WM8350_RTC_STS) {
419 int retries;
420
421 ret = wm8350_clear_bits(wm8350, WM8350_RTC_TIME_CONTROL,
422 WM8350_RTC_SET);
423 if (ret < 0) {
424 dev_err(&pdev->dev, "failed to start: %d\n", ret);
425 return ret;
426 }
427
428 retries = WM8350_SET_TIME_RETRIES;
429 do {
430 timectl = wm8350_reg_read(wm8350,
431 WM8350_RTC_TIME_CONTROL);
432 } while (timectl & WM8350_RTC_STS && --retries);
433
434 if (retries == 0) {
435 dev_err(&pdev->dev, "failed to start: timeout\n");
436 return -ENODEV;
437 }
438 }
439
440 device_init_wakeup(&pdev->dev, 1);
441
442 wm_rtc->rtc = rtc_device_register("wm8350", &pdev->dev,
443 &wm8350_rtc_ops, THIS_MODULE);
444 if (IS_ERR(wm_rtc->rtc)) {
445 ret = PTR_ERR(wm_rtc->rtc);
446 dev_err(&pdev->dev, "failed to register RTC: %d\n", ret);
447 return ret;
448 }
449
450 wm8350_register_irq(wm8350, WM8350_IRQ_RTC_SEC,
451 wm8350_rtc_update_handler, 0,
452 "RTC Seconds", wm8350);
453 wm8350_mask_irq(wm8350, WM8350_IRQ_RTC_SEC);
454
455 wm8350_register_irq(wm8350, WM8350_IRQ_RTC_ALM,
456 wm8350_rtc_alarm_handler, 0,
457 "RTC Alarm", wm8350);
458
459 return 0;
460}
461
462static int __devexit wm8350_rtc_remove(struct platform_device *pdev)
463{
464 struct wm8350 *wm8350 = platform_get_drvdata(pdev);
465 struct wm8350_rtc *wm_rtc = &wm8350->rtc;
466
467 wm8350_free_irq(wm8350, WM8350_IRQ_RTC_SEC, wm8350);
468 wm8350_free_irq(wm8350, WM8350_IRQ_RTC_ALM, wm8350);
469
470 rtc_device_unregister(wm_rtc->rtc);
471
472 return 0;
473}
474
475static struct dev_pm_ops wm8350_rtc_pm_ops = {
476 .suspend = wm8350_rtc_suspend,
477 .resume = wm8350_rtc_resume,
478};
479
480static struct platform_driver wm8350_rtc_driver = {
481 .probe = wm8350_rtc_probe,
482 .remove = __devexit_p(wm8350_rtc_remove),
483 .driver = {
484 .name = "wm8350-rtc",
485 .pm = &wm8350_rtc_pm_ops,
486 },
487};
488
489static int __init wm8350_rtc_init(void)
490{
491 return platform_driver_register(&wm8350_rtc_driver);
492}
493module_init(wm8350_rtc_init);
494
495static void __exit wm8350_rtc_exit(void)
496{
497 platform_driver_unregister(&wm8350_rtc_driver);
498}
499module_exit(wm8350_rtc_exit);
500
501MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
502MODULE_DESCRIPTION("RTC driver for the WM8350");
503MODULE_LICENSE("GPL");
504MODULE_ALIAS("platform:wm8350-rtc");