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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
6920d996 AJ |
2 | /* |
3 | * Real time clock driver for DA9055 | |
4 | * | |
5 | * Copyright(c) 2012 Dialog Semiconductor Ltd. | |
6 | * | |
7 | * Author: Dajun Dajun Chen <dajun.chen@diasemi.com> | |
6920d996 AJ |
8 | */ |
9 | ||
10 | #include <linux/module.h> | |
11 | #include <linux/platform_device.h> | |
12 | #include <linux/rtc.h> | |
13 | ||
14 | #include <linux/mfd/da9055/core.h> | |
15 | #include <linux/mfd/da9055/reg.h> | |
16 | #include <linux/mfd/da9055/pdata.h> | |
17 | ||
18 | struct da9055_rtc { | |
19 | struct rtc_device *rtc; | |
20 | struct da9055 *da9055; | |
21 | int alarm_enable; | |
22 | }; | |
23 | ||
24 | static int da9055_rtc_enable_alarm(struct da9055_rtc *rtc, bool enable) | |
25 | { | |
26 | int ret; | |
27 | if (enable) { | |
28 | ret = da9055_reg_update(rtc->da9055, DA9055_REG_ALARM_Y, | |
29 | DA9055_RTC_ALM_EN, | |
30 | DA9055_RTC_ALM_EN); | |
31 | if (ret != 0) | |
32 | dev_err(rtc->da9055->dev, "Failed to enable ALM: %d\n", | |
33 | ret); | |
34 | rtc->alarm_enable = 1; | |
35 | } else { | |
36 | ret = da9055_reg_update(rtc->da9055, DA9055_REG_ALARM_Y, | |
37 | DA9055_RTC_ALM_EN, 0); | |
38 | if (ret != 0) | |
39 | dev_err(rtc->da9055->dev, | |
40 | "Failed to disable ALM: %d\n", ret); | |
41 | rtc->alarm_enable = 0; | |
42 | } | |
43 | return ret; | |
44 | } | |
45 | ||
46 | static irqreturn_t da9055_rtc_alm_irq(int irq, void *data) | |
47 | { | |
48 | struct da9055_rtc *rtc = data; | |
49 | ||
50 | da9055_rtc_enable_alarm(rtc, 0); | |
51 | rtc_update_irq(rtc->rtc, 1, RTC_IRQF | RTC_AF); | |
52 | ||
53 | return IRQ_HANDLED; | |
54 | } | |
55 | ||
56 | static int da9055_read_alarm(struct da9055 *da9055, struct rtc_time *rtc_tm) | |
57 | { | |
58 | int ret; | |
59 | uint8_t v[5]; | |
60 | ||
61 | ret = da9055_group_read(da9055, DA9055_REG_ALARM_MI, 5, v); | |
62 | if (ret != 0) { | |
63 | dev_err(da9055->dev, "Failed to group read ALM: %d\n", ret); | |
64 | return ret; | |
65 | } | |
66 | ||
67 | rtc_tm->tm_year = (v[4] & DA9055_RTC_ALM_YEAR) + 100; | |
68 | rtc_tm->tm_mon = (v[3] & DA9055_RTC_ALM_MONTH) - 1; | |
69 | rtc_tm->tm_mday = v[2] & DA9055_RTC_ALM_DAY; | |
70 | rtc_tm->tm_hour = v[1] & DA9055_RTC_ALM_HOUR; | |
71 | rtc_tm->tm_min = v[0] & DA9055_RTC_ALM_MIN; | |
d2c92705 | 72 | rtc_tm->tm_sec = 0; |
6920d996 AJ |
73 | |
74 | return rtc_valid_tm(rtc_tm); | |
75 | } | |
76 | ||
77 | static int da9055_set_alarm(struct da9055 *da9055, struct rtc_time *rtc_tm) | |
78 | { | |
79 | int ret; | |
80 | uint8_t v[2]; | |
81 | ||
82 | rtc_tm->tm_year -= 100; | |
83 | rtc_tm->tm_mon += 1; | |
84 | ||
85 | ret = da9055_reg_update(da9055, DA9055_REG_ALARM_MI, | |
86 | DA9055_RTC_ALM_MIN, rtc_tm->tm_min); | |
87 | if (ret != 0) { | |
88 | dev_err(da9055->dev, "Failed to write ALRM MIN: %d\n", ret); | |
89 | return ret; | |
90 | } | |
91 | ||
92 | v[0] = rtc_tm->tm_hour; | |
93 | v[1] = rtc_tm->tm_mday; | |
94 | ||
95 | ret = da9055_group_write(da9055, DA9055_REG_ALARM_H, 2, v); | |
96 | if (ret < 0) | |
97 | return ret; | |
98 | ||
99 | ret = da9055_reg_update(da9055, DA9055_REG_ALARM_MO, | |
100 | DA9055_RTC_ALM_MONTH, rtc_tm->tm_mon); | |
101 | if (ret < 0) | |
102 | dev_err(da9055->dev, "Failed to write ALM Month:%d\n", ret); | |
103 | ||
104 | ret = da9055_reg_update(da9055, DA9055_REG_ALARM_Y, | |
105 | DA9055_RTC_ALM_YEAR, rtc_tm->tm_year); | |
106 | if (ret < 0) | |
107 | dev_err(da9055->dev, "Failed to write ALM Year:%d\n", ret); | |
108 | ||
109 | return ret; | |
110 | } | |
111 | ||
112 | static int da9055_rtc_get_alarm_status(struct da9055 *da9055) | |
113 | { | |
114 | int ret; | |
115 | ||
116 | ret = da9055_reg_read(da9055, DA9055_REG_ALARM_Y); | |
117 | if (ret < 0) { | |
118 | dev_err(da9055->dev, "Failed to read ALM: %d\n", ret); | |
119 | return ret; | |
120 | } | |
121 | ret &= DA9055_RTC_ALM_EN; | |
122 | return (ret > 0) ? 1 : 0; | |
123 | } | |
124 | ||
125 | static int da9055_rtc_read_time(struct device *dev, struct rtc_time *rtc_tm) | |
126 | { | |
127 | struct da9055_rtc *rtc = dev_get_drvdata(dev); | |
128 | uint8_t v[6]; | |
129 | int ret; | |
130 | ||
131 | ret = da9055_reg_read(rtc->da9055, DA9055_REG_COUNT_S); | |
132 | if (ret < 0) | |
133 | return ret; | |
134 | ||
135 | /* | |
136 | * Registers are only valid when RTC_READ | |
137 | * status bit is asserted | |
138 | */ | |
139 | if (!(ret & DA9055_RTC_READ)) | |
140 | return -EBUSY; | |
141 | ||
142 | ret = da9055_group_read(rtc->da9055, DA9055_REG_COUNT_S, 6, v); | |
143 | if (ret < 0) { | |
144 | dev_err(rtc->da9055->dev, "Failed to read RTC time : %d\n", | |
145 | ret); | |
146 | return ret; | |
147 | } | |
148 | ||
149 | rtc_tm->tm_year = (v[5] & DA9055_RTC_YEAR) + 100; | |
150 | rtc_tm->tm_mon = (v[4] & DA9055_RTC_MONTH) - 1; | |
151 | rtc_tm->tm_mday = v[3] & DA9055_RTC_DAY; | |
152 | rtc_tm->tm_hour = v[2] & DA9055_RTC_HOUR; | |
153 | rtc_tm->tm_min = v[1] & DA9055_RTC_MIN; | |
154 | rtc_tm->tm_sec = v[0] & DA9055_RTC_SEC; | |
155 | ||
bb54be13 | 156 | return 0; |
6920d996 AJ |
157 | } |
158 | ||
159 | static int da9055_rtc_set_time(struct device *dev, struct rtc_time *tm) | |
160 | { | |
161 | struct da9055_rtc *rtc; | |
162 | uint8_t v[6]; | |
163 | ||
164 | rtc = dev_get_drvdata(dev); | |
165 | ||
166 | v[0] = tm->tm_sec; | |
167 | v[1] = tm->tm_min; | |
168 | v[2] = tm->tm_hour; | |
169 | v[3] = tm->tm_mday; | |
170 | v[4] = tm->tm_mon + 1; | |
171 | v[5] = tm->tm_year - 100; | |
172 | ||
173 | return da9055_group_write(rtc->da9055, DA9055_REG_COUNT_S, 6, v); | |
174 | } | |
175 | ||
176 | static int da9055_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
177 | { | |
178 | int ret; | |
179 | struct rtc_time *tm = &alrm->time; | |
180 | struct da9055_rtc *rtc = dev_get_drvdata(dev); | |
181 | ||
182 | ret = da9055_read_alarm(rtc->da9055, tm); | |
183 | ||
184 | if (ret) | |
185 | return ret; | |
186 | ||
187 | alrm->enabled = da9055_rtc_get_alarm_status(rtc->da9055); | |
188 | ||
189 | return 0; | |
190 | } | |
191 | ||
192 | static int da9055_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
193 | { | |
194 | int ret; | |
195 | struct rtc_time *tm = &alrm->time; | |
196 | struct da9055_rtc *rtc = dev_get_drvdata(dev); | |
197 | ||
198 | ret = da9055_rtc_enable_alarm(rtc, 0); | |
199 | if (ret < 0) | |
200 | return ret; | |
201 | ||
202 | ret = da9055_set_alarm(rtc->da9055, tm); | |
203 | if (ret) | |
204 | return ret; | |
205 | ||
206 | ret = da9055_rtc_enable_alarm(rtc, 1); | |
207 | ||
208 | return ret; | |
209 | } | |
210 | ||
211 | static int da9055_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled) | |
212 | { | |
213 | struct da9055_rtc *rtc = dev_get_drvdata(dev); | |
214 | ||
215 | return da9055_rtc_enable_alarm(rtc, enabled); | |
216 | } | |
217 | ||
218 | static const struct rtc_class_ops da9055_rtc_ops = { | |
219 | .read_time = da9055_rtc_read_time, | |
220 | .set_time = da9055_rtc_set_time, | |
221 | .read_alarm = da9055_rtc_read_alarm, | |
222 | .set_alarm = da9055_rtc_set_alarm, | |
223 | .alarm_irq_enable = da9055_rtc_alarm_irq_enable, | |
224 | }; | |
225 | ||
0a1af1d6 | 226 | static int da9055_rtc_device_init(struct da9055 *da9055, |
6920d996 AJ |
227 | struct da9055_pdata *pdata) |
228 | { | |
229 | int ret; | |
230 | ||
231 | /* Enable RTC and the internal Crystal */ | |
232 | ret = da9055_reg_update(da9055, DA9055_REG_CONTROL_B, | |
233 | DA9055_RTC_EN, DA9055_RTC_EN); | |
234 | if (ret < 0) | |
235 | return ret; | |
236 | ret = da9055_reg_update(da9055, DA9055_REG_EN_32K, | |
237 | DA9055_CRYSTAL_EN, DA9055_CRYSTAL_EN); | |
238 | if (ret < 0) | |
239 | return ret; | |
240 | ||
241 | /* Enable RTC in Power Down mode */ | |
242 | ret = da9055_reg_update(da9055, DA9055_REG_CONTROL_B, | |
243 | DA9055_RTC_MODE_PD, DA9055_RTC_MODE_PD); | |
244 | if (ret < 0) | |
245 | return ret; | |
246 | ||
247 | /* Enable RTC in Reset mode */ | |
248 | if (pdata && pdata->reset_enable) { | |
249 | ret = da9055_reg_update(da9055, DA9055_REG_CONTROL_B, | |
250 | DA9055_RTC_MODE_SD, | |
251 | DA9055_RTC_MODE_SD << | |
252 | DA9055_RTC_MODE_SD_SHIFT); | |
253 | if (ret < 0) | |
254 | return ret; | |
255 | } | |
256 | ||
257 | /* Disable the RTC TICK ALM */ | |
258 | ret = da9055_reg_update(da9055, DA9055_REG_ALARM_MO, | |
259 | DA9055_RTC_TICK_WAKE_MASK, 0); | |
260 | if (ret < 0) | |
261 | return ret; | |
262 | ||
263 | return 0; | |
264 | } | |
265 | ||
266 | static int da9055_rtc_probe(struct platform_device *pdev) | |
267 | { | |
268 | struct da9055_rtc *rtc; | |
269 | struct da9055_pdata *pdata = NULL; | |
270 | int ret, alm_irq; | |
271 | ||
272 | rtc = devm_kzalloc(&pdev->dev, sizeof(struct da9055_rtc), GFP_KERNEL); | |
273 | if (!rtc) | |
274 | return -ENOMEM; | |
275 | ||
276 | rtc->da9055 = dev_get_drvdata(pdev->dev.parent); | |
d1fa2452 | 277 | pdata = dev_get_platdata(rtc->da9055->dev); |
6920d996 AJ |
278 | platform_set_drvdata(pdev, rtc); |
279 | ||
280 | ret = da9055_rtc_device_init(rtc->da9055, pdata); | |
281 | if (ret < 0) | |
282 | goto err_rtc; | |
283 | ||
284 | ret = da9055_reg_read(rtc->da9055, DA9055_REG_ALARM_Y); | |
285 | if (ret < 0) | |
286 | goto err_rtc; | |
287 | ||
288 | if (ret & DA9055_RTC_ALM_EN) | |
289 | rtc->alarm_enable = 1; | |
290 | ||
291 | device_init_wakeup(&pdev->dev, 1); | |
292 | ||
8c32edb5 | 293 | rtc->rtc = devm_rtc_device_register(&pdev->dev, pdev->name, |
6920d996 AJ |
294 | &da9055_rtc_ops, THIS_MODULE); |
295 | if (IS_ERR(rtc->rtc)) { | |
296 | ret = PTR_ERR(rtc->rtc); | |
297 | goto err_rtc; | |
298 | } | |
299 | ||
300 | alm_irq = platform_get_irq_byname(pdev, "ALM"); | |
dc9d8887 AT |
301 | if (alm_irq < 0) |
302 | return alm_irq; | |
303 | ||
6920d996 AJ |
304 | ret = devm_request_threaded_irq(&pdev->dev, alm_irq, NULL, |
305 | da9055_rtc_alm_irq, | |
306 | IRQF_TRIGGER_HIGH | IRQF_ONESHOT, | |
307 | "ALM", rtc); | |
308 | if (ret != 0) | |
309 | dev_err(rtc->da9055->dev, "irq registration failed: %d\n", ret); | |
310 | ||
311 | err_rtc: | |
312 | return ret; | |
313 | ||
314 | } | |
315 | ||
6920d996 AJ |
316 | #ifdef CONFIG_PM |
317 | /* Turn off the alarm if it should not be a wake source. */ | |
318 | static int da9055_rtc_suspend(struct device *dev) | |
319 | { | |
320 | struct platform_device *pdev = to_platform_device(dev); | |
321 | struct da9055_rtc *rtc = dev_get_drvdata(&pdev->dev); | |
322 | int ret; | |
323 | ||
324 | if (!device_may_wakeup(&pdev->dev)) { | |
325 | /* Disable the ALM IRQ */ | |
326 | ret = da9055_rtc_enable_alarm(rtc, 0); | |
327 | if (ret < 0) | |
328 | dev_err(&pdev->dev, "Failed to disable RTC ALM\n"); | |
329 | } | |
330 | ||
331 | return 0; | |
332 | } | |
333 | ||
334 | /* Enable the alarm if it should be enabled (in case it was disabled to | |
335 | * prevent use as a wake source). | |
336 | */ | |
337 | static int da9055_rtc_resume(struct device *dev) | |
338 | { | |
339 | struct platform_device *pdev = to_platform_device(dev); | |
340 | struct da9055_rtc *rtc = dev_get_drvdata(&pdev->dev); | |
341 | int ret; | |
342 | ||
343 | if (!device_may_wakeup(&pdev->dev)) { | |
344 | if (rtc->alarm_enable) { | |
345 | ret = da9055_rtc_enable_alarm(rtc, 1); | |
346 | if (ret < 0) | |
347 | dev_err(&pdev->dev, | |
348 | "Failed to restart RTC ALM\n"); | |
349 | } | |
350 | } | |
351 | ||
352 | return 0; | |
353 | } | |
354 | ||
355 | /* Unconditionally disable the alarm */ | |
356 | static int da9055_rtc_freeze(struct device *dev) | |
357 | { | |
358 | struct platform_device *pdev = to_platform_device(dev); | |
359 | struct da9055_rtc *rtc = dev_get_drvdata(&pdev->dev); | |
360 | int ret; | |
361 | ||
362 | ret = da9055_rtc_enable_alarm(rtc, 0); | |
363 | if (ret < 0) | |
364 | dev_err(&pdev->dev, "Failed to freeze RTC ALMs\n"); | |
365 | ||
366 | return 0; | |
367 | ||
368 | } | |
369 | #else | |
370 | #define da9055_rtc_suspend NULL | |
371 | #define da9055_rtc_resume NULL | |
372 | #define da9055_rtc_freeze NULL | |
373 | #endif | |
374 | ||
375 | static const struct dev_pm_ops da9055_rtc_pm_ops = { | |
376 | .suspend = da9055_rtc_suspend, | |
377 | .resume = da9055_rtc_resume, | |
378 | ||
379 | .freeze = da9055_rtc_freeze, | |
380 | .thaw = da9055_rtc_resume, | |
381 | .restore = da9055_rtc_resume, | |
382 | ||
383 | .poweroff = da9055_rtc_suspend, | |
384 | }; | |
385 | ||
386 | static struct platform_driver da9055_rtc_driver = { | |
387 | .probe = da9055_rtc_probe, | |
6920d996 AJ |
388 | .driver = { |
389 | .name = "da9055-rtc", | |
6920d996 AJ |
390 | .pm = &da9055_rtc_pm_ops, |
391 | }, | |
392 | }; | |
393 | ||
394 | module_platform_driver(da9055_rtc_driver); | |
395 | ||
396 | MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>"); | |
397 | MODULE_DESCRIPTION("RTC driver for Dialog DA9055 PMIC"); | |
398 | MODULE_LICENSE("GPL"); | |
399 | MODULE_ALIAS("platform:da9055-rtc"); |