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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
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
46
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
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
117 ret = wm8350_set_bits(wm8350, WM8350_RTC_TIME_CONTROL, WM8350_RTC_SET);
118 if (ret < 0)
119 return ret;
120
121
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
133 ret = wm8350_block_write(wm8350, WM8350_RTC_SECONDS_MINUTES, 4, time);
134 if (ret < 0)
135 return ret;
136
137
138 ret = wm8350_clear_bits(wm8350, WM8350_RTC_TIME_CONTROL,
139 WM8350_RTC_SET);
140 return ret;
141}
142
143
144
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
199 ret = wm8350_set_bits(wm8350, WM8350_RTC_TIME_CONTROL,
200 WM8350_RTC_ALMSET);
201 if (ret < 0)
202 return ret;
203
204
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
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
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
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_SLEEP
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#endif
379
380static int wm8350_rtc_probe(struct platform_device *pdev)
381{
382 struct wm8350 *wm8350 = platform_get_drvdata(pdev);
383 struct wm8350_rtc *wm_rtc = &wm8350->rtc;
384 int ret = 0;
385 u16 timectl, power5;
386
387 timectl = wm8350_reg_read(wm8350, WM8350_RTC_TIME_CONTROL);
388 if (timectl & WM8350_RTC_BCD) {
389 dev_err(&pdev->dev, "RTC BCD mode not supported\n");
390 return -EINVAL;
391 }
392 if (timectl & WM8350_RTC_12HR) {
393 dev_err(&pdev->dev, "RTC 12 hour mode not supported\n");
394 return -EINVAL;
395 }
396
397
398 power5 = wm8350_reg_read(wm8350, WM8350_POWER_MGMT_5);
399 if (!(power5 & WM8350_RTC_TICK_ENA)) {
400 dev_info(wm8350->dev, "Starting RTC\n");
401
402 wm8350_reg_unlock(wm8350);
403
404 ret = wm8350_set_bits(wm8350, WM8350_POWER_MGMT_5,
405 WM8350_RTC_TICK_ENA);
406 if (ret < 0) {
407 dev_err(&pdev->dev, "failed to enable RTC: %d\n", ret);
408 return ret;
409 }
410
411 wm8350_reg_lock(wm8350);
412 }
413
414 if (timectl & WM8350_RTC_STS) {
415 int retries;
416
417 ret = wm8350_clear_bits(wm8350, WM8350_RTC_TIME_CONTROL,
418 WM8350_RTC_SET);
419 if (ret < 0) {
420 dev_err(&pdev->dev, "failed to start: %d\n", ret);
421 return ret;
422 }
423
424 retries = WM8350_SET_TIME_RETRIES;
425 do {
426 timectl = wm8350_reg_read(wm8350,
427 WM8350_RTC_TIME_CONTROL);
428 } while (timectl & WM8350_RTC_STS && --retries);
429
430 if (retries == 0) {
431 dev_err(&pdev->dev, "failed to start: timeout\n");
432 return -ENODEV;
433 }
434 }
435
436 device_init_wakeup(&pdev->dev, 1);
437
438 wm_rtc->rtc = devm_rtc_device_register(&pdev->dev, "wm8350",
439 &wm8350_rtc_ops, THIS_MODULE);
440 if (IS_ERR(wm_rtc->rtc)) {
441 ret = PTR_ERR(wm_rtc->rtc);
442 dev_err(&pdev->dev, "failed to register RTC: %d\n", ret);
443 return ret;
444 }
445
446 wm8350_register_irq(wm8350, WM8350_IRQ_RTC_SEC,
447 wm8350_rtc_update_handler, 0,
448 "RTC Seconds", wm8350);
449 wm8350_mask_irq(wm8350, WM8350_IRQ_RTC_SEC);
450
451 wm8350_register_irq(wm8350, WM8350_IRQ_RTC_ALM,
452 wm8350_rtc_alarm_handler, 0,
453 "RTC Alarm", wm8350);
454
455 return 0;
456}
457
458static int wm8350_rtc_remove(struct platform_device *pdev)
459{
460 struct wm8350 *wm8350 = platform_get_drvdata(pdev);
461
462 wm8350_free_irq(wm8350, WM8350_IRQ_RTC_SEC, wm8350);
463 wm8350_free_irq(wm8350, WM8350_IRQ_RTC_ALM, wm8350);
464
465 return 0;
466}
467
468static SIMPLE_DEV_PM_OPS(wm8350_rtc_pm_ops, wm8350_rtc_suspend,
469 wm8350_rtc_resume);
470
471static struct platform_driver wm8350_rtc_driver = {
472 .probe = wm8350_rtc_probe,
473 .remove = wm8350_rtc_remove,
474 .driver = {
475 .name = "wm8350-rtc",
476 .pm = &wm8350_rtc_pm_ops,
477 },
478};
479
480module_platform_driver(wm8350_rtc_driver);
481
482MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
483MODULE_DESCRIPTION("RTC driver for the WM8350");
484MODULE_LICENSE("GPL");
485MODULE_ALIAS("platform:wm8350-rtc");
486
