Commit | Line | Data |
---|---|---|
6920d996 AJ |
1 | /* |
2 | * Real time clock driver for DA9055 | |
3 | * | |
4 | * Copyright(c) 2012 Dialog Semiconductor Ltd. | |
5 | * | |
6 | * Author: Dajun Dajun Chen <dajun.chen@diasemi.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | */ | |
14 | ||
15 | #include <linux/module.h> | |
16 | #include <linux/platform_device.h> | |
17 | #include <linux/rtc.h> | |
18 | ||
19 | #include <linux/mfd/da9055/core.h> | |
20 | #include <linux/mfd/da9055/reg.h> | |
21 | #include <linux/mfd/da9055/pdata.h> | |
22 | ||
23 | struct da9055_rtc { | |
24 | struct rtc_device *rtc; | |
25 | struct da9055 *da9055; | |
26 | int alarm_enable; | |
27 | }; | |
28 | ||
29 | static int da9055_rtc_enable_alarm(struct da9055_rtc *rtc, bool enable) | |
30 | { | |
31 | int ret; | |
32 | if (enable) { | |
33 | ret = da9055_reg_update(rtc->da9055, DA9055_REG_ALARM_Y, | |
34 | DA9055_RTC_ALM_EN, | |
35 | DA9055_RTC_ALM_EN); | |
36 | if (ret != 0) | |
37 | dev_err(rtc->da9055->dev, "Failed to enable ALM: %d\n", | |
38 | ret); | |
39 | rtc->alarm_enable = 1; | |
40 | } else { | |
41 | ret = da9055_reg_update(rtc->da9055, DA9055_REG_ALARM_Y, | |
42 | DA9055_RTC_ALM_EN, 0); | |
43 | if (ret != 0) | |
44 | dev_err(rtc->da9055->dev, | |
45 | "Failed to disable ALM: %d\n", ret); | |
46 | rtc->alarm_enable = 0; | |
47 | } | |
48 | return ret; | |
49 | } | |
50 | ||
51 | static irqreturn_t da9055_rtc_alm_irq(int irq, void *data) | |
52 | { | |
53 | struct da9055_rtc *rtc = data; | |
54 | ||
55 | da9055_rtc_enable_alarm(rtc, 0); | |
56 | rtc_update_irq(rtc->rtc, 1, RTC_IRQF | RTC_AF); | |
57 | ||
58 | return IRQ_HANDLED; | |
59 | } | |
60 | ||
61 | static int da9055_read_alarm(struct da9055 *da9055, struct rtc_time *rtc_tm) | |
62 | { | |
63 | int ret; | |
64 | uint8_t v[5]; | |
65 | ||
66 | ret = da9055_group_read(da9055, DA9055_REG_ALARM_MI, 5, v); | |
67 | if (ret != 0) { | |
68 | dev_err(da9055->dev, "Failed to group read ALM: %d\n", ret); | |
69 | return ret; | |
70 | } | |
71 | ||
72 | rtc_tm->tm_year = (v[4] & DA9055_RTC_ALM_YEAR) + 100; | |
73 | rtc_tm->tm_mon = (v[3] & DA9055_RTC_ALM_MONTH) - 1; | |
74 | rtc_tm->tm_mday = v[2] & DA9055_RTC_ALM_DAY; | |
75 | rtc_tm->tm_hour = v[1] & DA9055_RTC_ALM_HOUR; | |
76 | rtc_tm->tm_min = v[0] & DA9055_RTC_ALM_MIN; | |
d2c92705 | 77 | rtc_tm->tm_sec = 0; |
6920d996 AJ |
78 | |
79 | return rtc_valid_tm(rtc_tm); | |
80 | } | |
81 | ||
82 | static int da9055_set_alarm(struct da9055 *da9055, struct rtc_time *rtc_tm) | |
83 | { | |
84 | int ret; | |
85 | uint8_t v[2]; | |
86 | ||
87 | rtc_tm->tm_year -= 100; | |
88 | rtc_tm->tm_mon += 1; | |
89 | ||
90 | ret = da9055_reg_update(da9055, DA9055_REG_ALARM_MI, | |
91 | DA9055_RTC_ALM_MIN, rtc_tm->tm_min); | |
92 | if (ret != 0) { | |
93 | dev_err(da9055->dev, "Failed to write ALRM MIN: %d\n", ret); | |
94 | return ret; | |
95 | } | |
96 | ||
97 | v[0] = rtc_tm->tm_hour; | |
98 | v[1] = rtc_tm->tm_mday; | |
99 | ||
100 | ret = da9055_group_write(da9055, DA9055_REG_ALARM_H, 2, v); | |
101 | if (ret < 0) | |
102 | return ret; | |
103 | ||
104 | ret = da9055_reg_update(da9055, DA9055_REG_ALARM_MO, | |
105 | DA9055_RTC_ALM_MONTH, rtc_tm->tm_mon); | |
106 | if (ret < 0) | |
107 | dev_err(da9055->dev, "Failed to write ALM Month:%d\n", ret); | |
108 | ||
109 | ret = da9055_reg_update(da9055, DA9055_REG_ALARM_Y, | |
110 | DA9055_RTC_ALM_YEAR, rtc_tm->tm_year); | |
111 | if (ret < 0) | |
112 | dev_err(da9055->dev, "Failed to write ALM Year:%d\n", ret); | |
113 | ||
114 | return ret; | |
115 | } | |
116 | ||
117 | static int da9055_rtc_get_alarm_status(struct da9055 *da9055) | |
118 | { | |
119 | int ret; | |
120 | ||
121 | ret = da9055_reg_read(da9055, DA9055_REG_ALARM_Y); | |
122 | if (ret < 0) { | |
123 | dev_err(da9055->dev, "Failed to read ALM: %d\n", ret); | |
124 | return ret; | |
125 | } | |
126 | ret &= DA9055_RTC_ALM_EN; | |
127 | return (ret > 0) ? 1 : 0; | |
128 | } | |
129 | ||
130 | static int da9055_rtc_read_time(struct device *dev, struct rtc_time *rtc_tm) | |
131 | { | |
132 | struct da9055_rtc *rtc = dev_get_drvdata(dev); | |
133 | uint8_t v[6]; | |
134 | int ret; | |
135 | ||
136 | ret = da9055_reg_read(rtc->da9055, DA9055_REG_COUNT_S); | |
137 | if (ret < 0) | |
138 | return ret; | |
139 | ||
140 | /* | |
141 | * Registers are only valid when RTC_READ | |
142 | * status bit is asserted | |
143 | */ | |
144 | if (!(ret & DA9055_RTC_READ)) | |
145 | return -EBUSY; | |
146 | ||
147 | ret = da9055_group_read(rtc->da9055, DA9055_REG_COUNT_S, 6, v); | |
148 | if (ret < 0) { | |
149 | dev_err(rtc->da9055->dev, "Failed to read RTC time : %d\n", | |
150 | ret); | |
151 | return ret; | |
152 | } | |
153 | ||
154 | rtc_tm->tm_year = (v[5] & DA9055_RTC_YEAR) + 100; | |
155 | rtc_tm->tm_mon = (v[4] & DA9055_RTC_MONTH) - 1; | |
156 | rtc_tm->tm_mday = v[3] & DA9055_RTC_DAY; | |
157 | rtc_tm->tm_hour = v[2] & DA9055_RTC_HOUR; | |
158 | rtc_tm->tm_min = v[1] & DA9055_RTC_MIN; | |
159 | rtc_tm->tm_sec = v[0] & DA9055_RTC_SEC; | |
160 | ||
bb54be13 | 161 | return 0; |
6920d996 AJ |
162 | } |
163 | ||
164 | static int da9055_rtc_set_time(struct device *dev, struct rtc_time *tm) | |
165 | { | |
166 | struct da9055_rtc *rtc; | |
167 | uint8_t v[6]; | |
168 | ||
169 | rtc = dev_get_drvdata(dev); | |
170 | ||
171 | v[0] = tm->tm_sec; | |
172 | v[1] = tm->tm_min; | |
173 | v[2] = tm->tm_hour; | |
174 | v[3] = tm->tm_mday; | |
175 | v[4] = tm->tm_mon + 1; | |
176 | v[5] = tm->tm_year - 100; | |
177 | ||
178 | return da9055_group_write(rtc->da9055, DA9055_REG_COUNT_S, 6, v); | |
179 | } | |
180 | ||
181 | static int da9055_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
182 | { | |
183 | int ret; | |
184 | struct rtc_time *tm = &alrm->time; | |
185 | struct da9055_rtc *rtc = dev_get_drvdata(dev); | |
186 | ||
187 | ret = da9055_read_alarm(rtc->da9055, tm); | |
188 | ||
189 | if (ret) | |
190 | return ret; | |
191 | ||
192 | alrm->enabled = da9055_rtc_get_alarm_status(rtc->da9055); | |
193 | ||
194 | return 0; | |
195 | } | |
196 | ||
197 | static int da9055_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
198 | { | |
199 | int ret; | |
200 | struct rtc_time *tm = &alrm->time; | |
201 | struct da9055_rtc *rtc = dev_get_drvdata(dev); | |
202 | ||
203 | ret = da9055_rtc_enable_alarm(rtc, 0); | |
204 | if (ret < 0) | |
205 | return ret; | |
206 | ||
207 | ret = da9055_set_alarm(rtc->da9055, tm); | |
208 | if (ret) | |
209 | return ret; | |
210 | ||
211 | ret = da9055_rtc_enable_alarm(rtc, 1); | |
212 | ||
213 | return ret; | |
214 | } | |
215 | ||
216 | static int da9055_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled) | |
217 | { | |
218 | struct da9055_rtc *rtc = dev_get_drvdata(dev); | |
219 | ||
220 | return da9055_rtc_enable_alarm(rtc, enabled); | |
221 | } | |
222 | ||
223 | static const struct rtc_class_ops da9055_rtc_ops = { | |
224 | .read_time = da9055_rtc_read_time, | |
225 | .set_time = da9055_rtc_set_time, | |
226 | .read_alarm = da9055_rtc_read_alarm, | |
227 | .set_alarm = da9055_rtc_set_alarm, | |
228 | .alarm_irq_enable = da9055_rtc_alarm_irq_enable, | |
229 | }; | |
230 | ||
0a1af1d6 | 231 | static int da9055_rtc_device_init(struct da9055 *da9055, |
6920d996 AJ |
232 | struct da9055_pdata *pdata) |
233 | { | |
234 | int ret; | |
235 | ||
236 | /* Enable RTC and the internal Crystal */ | |
237 | ret = da9055_reg_update(da9055, DA9055_REG_CONTROL_B, | |
238 | DA9055_RTC_EN, DA9055_RTC_EN); | |
239 | if (ret < 0) | |
240 | return ret; | |
241 | ret = da9055_reg_update(da9055, DA9055_REG_EN_32K, | |
242 | DA9055_CRYSTAL_EN, DA9055_CRYSTAL_EN); | |
243 | if (ret < 0) | |
244 | return ret; | |
245 | ||
246 | /* Enable RTC in Power Down mode */ | |
247 | ret = da9055_reg_update(da9055, DA9055_REG_CONTROL_B, | |
248 | DA9055_RTC_MODE_PD, DA9055_RTC_MODE_PD); | |
249 | if (ret < 0) | |
250 | return ret; | |
251 | ||
252 | /* Enable RTC in Reset mode */ | |
253 | if (pdata && pdata->reset_enable) { | |
254 | ret = da9055_reg_update(da9055, DA9055_REG_CONTROL_B, | |
255 | DA9055_RTC_MODE_SD, | |
256 | DA9055_RTC_MODE_SD << | |
257 | DA9055_RTC_MODE_SD_SHIFT); | |
258 | if (ret < 0) | |
259 | return ret; | |
260 | } | |
261 | ||
262 | /* Disable the RTC TICK ALM */ | |
263 | ret = da9055_reg_update(da9055, DA9055_REG_ALARM_MO, | |
264 | DA9055_RTC_TICK_WAKE_MASK, 0); | |
265 | if (ret < 0) | |
266 | return ret; | |
267 | ||
268 | return 0; | |
269 | } | |
270 | ||
271 | static int da9055_rtc_probe(struct platform_device *pdev) | |
272 | { | |
273 | struct da9055_rtc *rtc; | |
274 | struct da9055_pdata *pdata = NULL; | |
275 | int ret, alm_irq; | |
276 | ||
277 | rtc = devm_kzalloc(&pdev->dev, sizeof(struct da9055_rtc), GFP_KERNEL); | |
278 | if (!rtc) | |
279 | return -ENOMEM; | |
280 | ||
281 | rtc->da9055 = dev_get_drvdata(pdev->dev.parent); | |
d1fa2452 | 282 | pdata = dev_get_platdata(rtc->da9055->dev); |
6920d996 AJ |
283 | platform_set_drvdata(pdev, rtc); |
284 | ||
285 | ret = da9055_rtc_device_init(rtc->da9055, pdata); | |
286 | if (ret < 0) | |
287 | goto err_rtc; | |
288 | ||
289 | ret = da9055_reg_read(rtc->da9055, DA9055_REG_ALARM_Y); | |
290 | if (ret < 0) | |
291 | goto err_rtc; | |
292 | ||
293 | if (ret & DA9055_RTC_ALM_EN) | |
294 | rtc->alarm_enable = 1; | |
295 | ||
296 | device_init_wakeup(&pdev->dev, 1); | |
297 | ||
8c32edb5 | 298 | rtc->rtc = devm_rtc_device_register(&pdev->dev, pdev->name, |
6920d996 AJ |
299 | &da9055_rtc_ops, THIS_MODULE); |
300 | if (IS_ERR(rtc->rtc)) { | |
301 | ret = PTR_ERR(rtc->rtc); | |
302 | goto err_rtc; | |
303 | } | |
304 | ||
305 | alm_irq = platform_get_irq_byname(pdev, "ALM"); | |
dc9d8887 AT |
306 | if (alm_irq < 0) |
307 | return alm_irq; | |
308 | ||
6920d996 AJ |
309 | ret = devm_request_threaded_irq(&pdev->dev, alm_irq, NULL, |
310 | da9055_rtc_alm_irq, | |
311 | IRQF_TRIGGER_HIGH | IRQF_ONESHOT, | |
312 | "ALM", rtc); | |
313 | if (ret != 0) | |
314 | dev_err(rtc->da9055->dev, "irq registration failed: %d\n", ret); | |
315 | ||
316 | err_rtc: | |
317 | return ret; | |
318 | ||
319 | } | |
320 | ||
6920d996 AJ |
321 | #ifdef CONFIG_PM |
322 | /* Turn off the alarm if it should not be a wake source. */ | |
323 | static int da9055_rtc_suspend(struct device *dev) | |
324 | { | |
325 | struct platform_device *pdev = to_platform_device(dev); | |
326 | struct da9055_rtc *rtc = dev_get_drvdata(&pdev->dev); | |
327 | int ret; | |
328 | ||
329 | if (!device_may_wakeup(&pdev->dev)) { | |
330 | /* Disable the ALM IRQ */ | |
331 | ret = da9055_rtc_enable_alarm(rtc, 0); | |
332 | if (ret < 0) | |
333 | dev_err(&pdev->dev, "Failed to disable RTC ALM\n"); | |
334 | } | |
335 | ||
336 | return 0; | |
337 | } | |
338 | ||
339 | /* Enable the alarm if it should be enabled (in case it was disabled to | |
340 | * prevent use as a wake source). | |
341 | */ | |
342 | static int da9055_rtc_resume(struct device *dev) | |
343 | { | |
344 | struct platform_device *pdev = to_platform_device(dev); | |
345 | struct da9055_rtc *rtc = dev_get_drvdata(&pdev->dev); | |
346 | int ret; | |
347 | ||
348 | if (!device_may_wakeup(&pdev->dev)) { | |
349 | if (rtc->alarm_enable) { | |
350 | ret = da9055_rtc_enable_alarm(rtc, 1); | |
351 | if (ret < 0) | |
352 | dev_err(&pdev->dev, | |
353 | "Failed to restart RTC ALM\n"); | |
354 | } | |
355 | } | |
356 | ||
357 | return 0; | |
358 | } | |
359 | ||
360 | /* Unconditionally disable the alarm */ | |
361 | static int da9055_rtc_freeze(struct device *dev) | |
362 | { | |
363 | struct platform_device *pdev = to_platform_device(dev); | |
364 | struct da9055_rtc *rtc = dev_get_drvdata(&pdev->dev); | |
365 | int ret; | |
366 | ||
367 | ret = da9055_rtc_enable_alarm(rtc, 0); | |
368 | if (ret < 0) | |
369 | dev_err(&pdev->dev, "Failed to freeze RTC ALMs\n"); | |
370 | ||
371 | return 0; | |
372 | ||
373 | } | |
374 | #else | |
375 | #define da9055_rtc_suspend NULL | |
376 | #define da9055_rtc_resume NULL | |
377 | #define da9055_rtc_freeze NULL | |
378 | #endif | |
379 | ||
380 | static const struct dev_pm_ops da9055_rtc_pm_ops = { | |
381 | .suspend = da9055_rtc_suspend, | |
382 | .resume = da9055_rtc_resume, | |
383 | ||
384 | .freeze = da9055_rtc_freeze, | |
385 | .thaw = da9055_rtc_resume, | |
386 | .restore = da9055_rtc_resume, | |
387 | ||
388 | .poweroff = da9055_rtc_suspend, | |
389 | }; | |
390 | ||
391 | static struct platform_driver da9055_rtc_driver = { | |
392 | .probe = da9055_rtc_probe, | |
6920d996 AJ |
393 | .driver = { |
394 | .name = "da9055-rtc", | |
6920d996 AJ |
395 | .pm = &da9055_rtc_pm_ops, |
396 | }, | |
397 | }; | |
398 | ||
399 | module_platform_driver(da9055_rtc_driver); | |
400 | ||
401 | MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>"); | |
402 | MODULE_DESCRIPTION("RTC driver for Dialog DA9055 PMIC"); | |
403 | MODULE_LICENSE("GPL"); | |
404 | MODULE_ALIAS("platform:da9055-rtc"); |