]>
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; | |
77 | ||
78 | return rtc_valid_tm(rtc_tm); | |
79 | } | |
80 | ||
81 | static int da9055_set_alarm(struct da9055 *da9055, struct rtc_time *rtc_tm) | |
82 | { | |
83 | int ret; | |
84 | uint8_t v[2]; | |
85 | ||
86 | rtc_tm->tm_year -= 100; | |
87 | rtc_tm->tm_mon += 1; | |
88 | ||
89 | ret = da9055_reg_update(da9055, DA9055_REG_ALARM_MI, | |
90 | DA9055_RTC_ALM_MIN, rtc_tm->tm_min); | |
91 | if (ret != 0) { | |
92 | dev_err(da9055->dev, "Failed to write ALRM MIN: %d\n", ret); | |
93 | return ret; | |
94 | } | |
95 | ||
96 | v[0] = rtc_tm->tm_hour; | |
97 | v[1] = rtc_tm->tm_mday; | |
98 | ||
99 | ret = da9055_group_write(da9055, DA9055_REG_ALARM_H, 2, v); | |
100 | if (ret < 0) | |
101 | return ret; | |
102 | ||
103 | ret = da9055_reg_update(da9055, DA9055_REG_ALARM_MO, | |
104 | DA9055_RTC_ALM_MONTH, rtc_tm->tm_mon); | |
105 | if (ret < 0) | |
106 | dev_err(da9055->dev, "Failed to write ALM Month:%d\n", ret); | |
107 | ||
108 | ret = da9055_reg_update(da9055, DA9055_REG_ALARM_Y, | |
109 | DA9055_RTC_ALM_YEAR, rtc_tm->tm_year); | |
110 | if (ret < 0) | |
111 | dev_err(da9055->dev, "Failed to write ALM Year:%d\n", ret); | |
112 | ||
113 | return ret; | |
114 | } | |
115 | ||
116 | static int da9055_rtc_get_alarm_status(struct da9055 *da9055) | |
117 | { | |
118 | int ret; | |
119 | ||
120 | ret = da9055_reg_read(da9055, DA9055_REG_ALARM_Y); | |
121 | if (ret < 0) { | |
122 | dev_err(da9055->dev, "Failed to read ALM: %d\n", ret); | |
123 | return ret; | |
124 | } | |
125 | ret &= DA9055_RTC_ALM_EN; | |
126 | return (ret > 0) ? 1 : 0; | |
127 | } | |
128 | ||
129 | static int da9055_rtc_read_time(struct device *dev, struct rtc_time *rtc_tm) | |
130 | { | |
131 | struct da9055_rtc *rtc = dev_get_drvdata(dev); | |
132 | uint8_t v[6]; | |
133 | int ret; | |
134 | ||
135 | ret = da9055_reg_read(rtc->da9055, DA9055_REG_COUNT_S); | |
136 | if (ret < 0) | |
137 | return ret; | |
138 | ||
139 | /* | |
140 | * Registers are only valid when RTC_READ | |
141 | * status bit is asserted | |
142 | */ | |
143 | if (!(ret & DA9055_RTC_READ)) | |
144 | return -EBUSY; | |
145 | ||
146 | ret = da9055_group_read(rtc->da9055, DA9055_REG_COUNT_S, 6, v); | |
147 | if (ret < 0) { | |
148 | dev_err(rtc->da9055->dev, "Failed to read RTC time : %d\n", | |
149 | ret); | |
150 | return ret; | |
151 | } | |
152 | ||
153 | rtc_tm->tm_year = (v[5] & DA9055_RTC_YEAR) + 100; | |
154 | rtc_tm->tm_mon = (v[4] & DA9055_RTC_MONTH) - 1; | |
155 | rtc_tm->tm_mday = v[3] & DA9055_RTC_DAY; | |
156 | rtc_tm->tm_hour = v[2] & DA9055_RTC_HOUR; | |
157 | rtc_tm->tm_min = v[1] & DA9055_RTC_MIN; | |
158 | rtc_tm->tm_sec = v[0] & DA9055_RTC_SEC; | |
159 | ||
160 | return rtc_valid_tm(rtc_tm); | |
161 | } | |
162 | ||
163 | static int da9055_rtc_set_time(struct device *dev, struct rtc_time *tm) | |
164 | { | |
165 | struct da9055_rtc *rtc; | |
166 | uint8_t v[6]; | |
167 | ||
168 | rtc = dev_get_drvdata(dev); | |
169 | ||
170 | v[0] = tm->tm_sec; | |
171 | v[1] = tm->tm_min; | |
172 | v[2] = tm->tm_hour; | |
173 | v[3] = tm->tm_mday; | |
174 | v[4] = tm->tm_mon + 1; | |
175 | v[5] = tm->tm_year - 100; | |
176 | ||
177 | return da9055_group_write(rtc->da9055, DA9055_REG_COUNT_S, 6, v); | |
178 | } | |
179 | ||
180 | static int da9055_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
181 | { | |
182 | int ret; | |
183 | struct rtc_time *tm = &alrm->time; | |
184 | struct da9055_rtc *rtc = dev_get_drvdata(dev); | |
185 | ||
186 | ret = da9055_read_alarm(rtc->da9055, tm); | |
187 | ||
188 | if (ret) | |
189 | return ret; | |
190 | ||
191 | alrm->enabled = da9055_rtc_get_alarm_status(rtc->da9055); | |
192 | ||
193 | return 0; | |
194 | } | |
195 | ||
196 | static int da9055_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
197 | { | |
198 | int ret; | |
199 | struct rtc_time *tm = &alrm->time; | |
200 | struct da9055_rtc *rtc = dev_get_drvdata(dev); | |
201 | ||
202 | ret = da9055_rtc_enable_alarm(rtc, 0); | |
203 | if (ret < 0) | |
204 | return ret; | |
205 | ||
206 | ret = da9055_set_alarm(rtc->da9055, tm); | |
207 | if (ret) | |
208 | return ret; | |
209 | ||
210 | ret = da9055_rtc_enable_alarm(rtc, 1); | |
211 | ||
212 | return ret; | |
213 | } | |
214 | ||
215 | static int da9055_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled) | |
216 | { | |
217 | struct da9055_rtc *rtc = dev_get_drvdata(dev); | |
218 | ||
219 | return da9055_rtc_enable_alarm(rtc, enabled); | |
220 | } | |
221 | ||
222 | static const struct rtc_class_ops da9055_rtc_ops = { | |
223 | .read_time = da9055_rtc_read_time, | |
224 | .set_time = da9055_rtc_set_time, | |
225 | .read_alarm = da9055_rtc_read_alarm, | |
226 | .set_alarm = da9055_rtc_set_alarm, | |
227 | .alarm_irq_enable = da9055_rtc_alarm_irq_enable, | |
228 | }; | |
229 | ||
0a1af1d6 | 230 | static int da9055_rtc_device_init(struct da9055 *da9055, |
6920d996 AJ |
231 | struct da9055_pdata *pdata) |
232 | { | |
233 | int ret; | |
234 | ||
235 | /* Enable RTC and the internal Crystal */ | |
236 | ret = da9055_reg_update(da9055, DA9055_REG_CONTROL_B, | |
237 | DA9055_RTC_EN, DA9055_RTC_EN); | |
238 | if (ret < 0) | |
239 | return ret; | |
240 | ret = da9055_reg_update(da9055, DA9055_REG_EN_32K, | |
241 | DA9055_CRYSTAL_EN, DA9055_CRYSTAL_EN); | |
242 | if (ret < 0) | |
243 | return ret; | |
244 | ||
245 | /* Enable RTC in Power Down mode */ | |
246 | ret = da9055_reg_update(da9055, DA9055_REG_CONTROL_B, | |
247 | DA9055_RTC_MODE_PD, DA9055_RTC_MODE_PD); | |
248 | if (ret < 0) | |
249 | return ret; | |
250 | ||
251 | /* Enable RTC in Reset mode */ | |
252 | if (pdata && pdata->reset_enable) { | |
253 | ret = da9055_reg_update(da9055, DA9055_REG_CONTROL_B, | |
254 | DA9055_RTC_MODE_SD, | |
255 | DA9055_RTC_MODE_SD << | |
256 | DA9055_RTC_MODE_SD_SHIFT); | |
257 | if (ret < 0) | |
258 | return ret; | |
259 | } | |
260 | ||
261 | /* Disable the RTC TICK ALM */ | |
262 | ret = da9055_reg_update(da9055, DA9055_REG_ALARM_MO, | |
263 | DA9055_RTC_TICK_WAKE_MASK, 0); | |
264 | if (ret < 0) | |
265 | return ret; | |
266 | ||
267 | return 0; | |
268 | } | |
269 | ||
270 | static int da9055_rtc_probe(struct platform_device *pdev) | |
271 | { | |
272 | struct da9055_rtc *rtc; | |
273 | struct da9055_pdata *pdata = NULL; | |
274 | int ret, alm_irq; | |
275 | ||
276 | rtc = devm_kzalloc(&pdev->dev, sizeof(struct da9055_rtc), GFP_KERNEL); | |
277 | if (!rtc) | |
278 | return -ENOMEM; | |
279 | ||
280 | rtc->da9055 = dev_get_drvdata(pdev->dev.parent); | |
281 | pdata = rtc->da9055->dev->platform_data; | |
282 | platform_set_drvdata(pdev, rtc); | |
283 | ||
284 | ret = da9055_rtc_device_init(rtc->da9055, pdata); | |
285 | if (ret < 0) | |
286 | goto err_rtc; | |
287 | ||
288 | ret = da9055_reg_read(rtc->da9055, DA9055_REG_ALARM_Y); | |
289 | if (ret < 0) | |
290 | goto err_rtc; | |
291 | ||
292 | if (ret & DA9055_RTC_ALM_EN) | |
293 | rtc->alarm_enable = 1; | |
294 | ||
295 | device_init_wakeup(&pdev->dev, 1); | |
296 | ||
297 | rtc->rtc = rtc_device_register(pdev->name, &pdev->dev, | |
298 | &da9055_rtc_ops, THIS_MODULE); | |
299 | if (IS_ERR(rtc->rtc)) { | |
300 | ret = PTR_ERR(rtc->rtc); | |
301 | goto err_rtc; | |
302 | } | |
303 | ||
304 | alm_irq = platform_get_irq_byname(pdev, "ALM"); | |
305 | alm_irq = regmap_irq_get_virq(rtc->da9055->irq_data, alm_irq); | |
306 | ret = devm_request_threaded_irq(&pdev->dev, alm_irq, NULL, | |
307 | da9055_rtc_alm_irq, | |
308 | IRQF_TRIGGER_HIGH | IRQF_ONESHOT, | |
309 | "ALM", rtc); | |
310 | if (ret != 0) | |
311 | dev_err(rtc->da9055->dev, "irq registration failed: %d\n", ret); | |
312 | ||
313 | err_rtc: | |
314 | return ret; | |
315 | ||
316 | } | |
317 | ||
318 | static int da9055_rtc_remove(struct platform_device *pdev) | |
319 | { | |
320 | struct da9055_rtc *rtc = pdev->dev.platform_data; | |
321 | ||
322 | rtc_device_unregister(rtc->rtc); | |
323 | platform_set_drvdata(pdev, NULL); | |
324 | ||
325 | return 0; | |
326 | } | |
327 | ||
328 | #ifdef CONFIG_PM | |
329 | /* Turn off the alarm if it should not be a wake source. */ | |
330 | static int da9055_rtc_suspend(struct device *dev) | |
331 | { | |
332 | struct platform_device *pdev = to_platform_device(dev); | |
333 | struct da9055_rtc *rtc = dev_get_drvdata(&pdev->dev); | |
334 | int ret; | |
335 | ||
336 | if (!device_may_wakeup(&pdev->dev)) { | |
337 | /* Disable the ALM IRQ */ | |
338 | ret = da9055_rtc_enable_alarm(rtc, 0); | |
339 | if (ret < 0) | |
340 | dev_err(&pdev->dev, "Failed to disable RTC ALM\n"); | |
341 | } | |
342 | ||
343 | return 0; | |
344 | } | |
345 | ||
346 | /* Enable the alarm if it should be enabled (in case it was disabled to | |
347 | * prevent use as a wake source). | |
348 | */ | |
349 | static int da9055_rtc_resume(struct device *dev) | |
350 | { | |
351 | struct platform_device *pdev = to_platform_device(dev); | |
352 | struct da9055_rtc *rtc = dev_get_drvdata(&pdev->dev); | |
353 | int ret; | |
354 | ||
355 | if (!device_may_wakeup(&pdev->dev)) { | |
356 | if (rtc->alarm_enable) { | |
357 | ret = da9055_rtc_enable_alarm(rtc, 1); | |
358 | if (ret < 0) | |
359 | dev_err(&pdev->dev, | |
360 | "Failed to restart RTC ALM\n"); | |
361 | } | |
362 | } | |
363 | ||
364 | return 0; | |
365 | } | |
366 | ||
367 | /* Unconditionally disable the alarm */ | |
368 | static int da9055_rtc_freeze(struct device *dev) | |
369 | { | |
370 | struct platform_device *pdev = to_platform_device(dev); | |
371 | struct da9055_rtc *rtc = dev_get_drvdata(&pdev->dev); | |
372 | int ret; | |
373 | ||
374 | ret = da9055_rtc_enable_alarm(rtc, 0); | |
375 | if (ret < 0) | |
376 | dev_err(&pdev->dev, "Failed to freeze RTC ALMs\n"); | |
377 | ||
378 | return 0; | |
379 | ||
380 | } | |
381 | #else | |
382 | #define da9055_rtc_suspend NULL | |
383 | #define da9055_rtc_resume NULL | |
384 | #define da9055_rtc_freeze NULL | |
385 | #endif | |
386 | ||
387 | static const struct dev_pm_ops da9055_rtc_pm_ops = { | |
388 | .suspend = da9055_rtc_suspend, | |
389 | .resume = da9055_rtc_resume, | |
390 | ||
391 | .freeze = da9055_rtc_freeze, | |
392 | .thaw = da9055_rtc_resume, | |
393 | .restore = da9055_rtc_resume, | |
394 | ||
395 | .poweroff = da9055_rtc_suspend, | |
396 | }; | |
397 | ||
398 | static struct platform_driver da9055_rtc_driver = { | |
399 | .probe = da9055_rtc_probe, | |
400 | .remove = da9055_rtc_remove, | |
401 | .driver = { | |
402 | .name = "da9055-rtc", | |
403 | .owner = THIS_MODULE, | |
404 | .pm = &da9055_rtc_pm_ops, | |
405 | }, | |
406 | }; | |
407 | ||
408 | module_platform_driver(da9055_rtc_driver); | |
409 | ||
410 | MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>"); | |
411 | MODULE_DESCRIPTION("RTC driver for Dialog DA9055 PMIC"); | |
412 | MODULE_LICENSE("GPL"); | |
413 | MODULE_ALIAS("platform:da9055-rtc"); |