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c2a57550 OST |
1 | /* rtc-da9063.c - Real time clock device driver for DA9063 |
2 | * Copyright (C) 2013-14 Dialog Semiconductor Ltd. | |
3 | * | |
4 | * This library is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU Library General Public | |
6 | * License as published by the Free Software Foundation; either | |
7 | * version 2 of the License, or (at your option) any later version. | |
8 | * | |
9 | * This library is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | * Library General Public License for more details. | |
13 | */ | |
14 | ||
15 | #include <linux/kernel.h> | |
16 | #include <linux/module.h> | |
17 | #include <linux/init.h> | |
18 | #include <linux/platform_device.h> | |
19 | #include <linux/interrupt.h> | |
20 | #include <linux/rtc.h> | |
21 | #include <linux/slab.h> | |
22 | #include <linux/delay.h> | |
23 | #include <linux/regmap.h> | |
24 | #include <linux/mfd/da9063/registers.h> | |
25 | #include <linux/mfd/da9063/core.h> | |
26 | ||
27 | #define YEARS_TO_DA9063(year) ((year) - 100) | |
28 | #define MONTHS_TO_DA9063(month) ((month) + 1) | |
29 | #define YEARS_FROM_DA9063(year) ((year) + 100) | |
30 | #define MONTHS_FROM_DA9063(month) ((month) - 1) | |
31 | ||
9cb42e2a OST |
32 | #define RTC_ALARM_DATA_LEN (DA9063_AD_REG_ALARM_Y - DA9063_AD_REG_ALARM_MI + 1) |
33 | ||
c2a57550 OST |
34 | #define RTC_DATA_LEN (DA9063_REG_COUNT_Y - DA9063_REG_COUNT_S + 1) |
35 | #define RTC_SEC 0 | |
36 | #define RTC_MIN 1 | |
37 | #define RTC_HOUR 2 | |
38 | #define RTC_DAY 3 | |
39 | #define RTC_MONTH 4 | |
40 | #define RTC_YEAR 5 | |
41 | ||
42 | struct da9063_rtc { | |
43 | struct rtc_device *rtc_dev; | |
44 | struct da9063 *hw; | |
45 | struct rtc_time alarm_time; | |
46 | bool rtc_sync; | |
9cb42e2a OST |
47 | int alarm_year; |
48 | int alarm_start; | |
49 | int alarm_len; | |
50 | int data_start; | |
c2a57550 OST |
51 | }; |
52 | ||
53 | static void da9063_data_to_tm(u8 *data, struct rtc_time *tm) | |
54 | { | |
55 | tm->tm_sec = data[RTC_SEC] & DA9063_COUNT_SEC_MASK; | |
56 | tm->tm_min = data[RTC_MIN] & DA9063_COUNT_MIN_MASK; | |
57 | tm->tm_hour = data[RTC_HOUR] & DA9063_COUNT_HOUR_MASK; | |
58 | tm->tm_mday = data[RTC_DAY] & DA9063_COUNT_DAY_MASK; | |
59 | tm->tm_mon = MONTHS_FROM_DA9063(data[RTC_MONTH] & | |
60 | DA9063_COUNT_MONTH_MASK); | |
61 | tm->tm_year = YEARS_FROM_DA9063(data[RTC_YEAR] & | |
62 | DA9063_COUNT_YEAR_MASK); | |
63 | } | |
64 | ||
65 | static void da9063_tm_to_data(struct rtc_time *tm, u8 *data) | |
66 | { | |
67 | data[RTC_SEC] &= ~DA9063_COUNT_SEC_MASK; | |
68 | data[RTC_SEC] |= tm->tm_sec & DA9063_COUNT_SEC_MASK; | |
69 | ||
70 | data[RTC_MIN] &= ~DA9063_COUNT_MIN_MASK; | |
71 | data[RTC_MIN] |= tm->tm_min & DA9063_COUNT_MIN_MASK; | |
72 | ||
73 | data[RTC_HOUR] &= ~DA9063_COUNT_HOUR_MASK; | |
74 | data[RTC_HOUR] |= tm->tm_hour & DA9063_COUNT_HOUR_MASK; | |
75 | ||
76 | data[RTC_DAY] &= ~DA9063_COUNT_DAY_MASK; | |
77 | data[RTC_DAY] |= tm->tm_mday & DA9063_COUNT_DAY_MASK; | |
78 | ||
79 | data[RTC_MONTH] &= ~DA9063_COUNT_MONTH_MASK; | |
80 | data[RTC_MONTH] |= MONTHS_TO_DA9063(tm->tm_mon) & | |
81 | DA9063_COUNT_MONTH_MASK; | |
82 | ||
83 | data[RTC_YEAR] &= ~DA9063_COUNT_YEAR_MASK; | |
84 | data[RTC_YEAR] |= YEARS_TO_DA9063(tm->tm_year) & | |
85 | DA9063_COUNT_YEAR_MASK; | |
86 | } | |
87 | ||
88 | static int da9063_rtc_stop_alarm(struct device *dev) | |
89 | { | |
90 | struct da9063_rtc *rtc = dev_get_drvdata(dev); | |
91 | ||
9cb42e2a | 92 | return regmap_update_bits(rtc->hw->regmap, rtc->alarm_year, |
c2a57550 OST |
93 | DA9063_ALARM_ON, 0); |
94 | } | |
95 | ||
96 | static int da9063_rtc_start_alarm(struct device *dev) | |
97 | { | |
98 | struct da9063_rtc *rtc = dev_get_drvdata(dev); | |
99 | ||
9cb42e2a | 100 | return regmap_update_bits(rtc->hw->regmap, rtc->alarm_year, |
c2a57550 OST |
101 | DA9063_ALARM_ON, DA9063_ALARM_ON); |
102 | } | |
103 | ||
104 | static int da9063_rtc_read_time(struct device *dev, struct rtc_time *tm) | |
105 | { | |
106 | struct da9063_rtc *rtc = dev_get_drvdata(dev); | |
107 | unsigned long tm_secs; | |
108 | unsigned long al_secs; | |
109 | u8 data[RTC_DATA_LEN]; | |
110 | int ret; | |
111 | ||
112 | ret = regmap_bulk_read(rtc->hw->regmap, DA9063_REG_COUNT_S, | |
113 | data, RTC_DATA_LEN); | |
114 | if (ret < 0) { | |
115 | dev_err(dev, "Failed to read RTC time data: %d\n", ret); | |
116 | return ret; | |
117 | } | |
118 | ||
119 | if (!(data[RTC_SEC] & DA9063_RTC_READ)) { | |
120 | dev_dbg(dev, "RTC not yet ready to be read by the host\n"); | |
121 | return -EINVAL; | |
122 | } | |
123 | ||
124 | da9063_data_to_tm(data, tm); | |
125 | ||
126 | rtc_tm_to_time(tm, &tm_secs); | |
127 | rtc_tm_to_time(&rtc->alarm_time, &al_secs); | |
128 | ||
129 | /* handle the rtc synchronisation delay */ | |
130 | if (rtc->rtc_sync == true && al_secs - tm_secs == 1) | |
131 | memcpy(tm, &rtc->alarm_time, sizeof(struct rtc_time)); | |
132 | else | |
133 | rtc->rtc_sync = false; | |
134 | ||
135 | return rtc_valid_tm(tm); | |
136 | } | |
137 | ||
138 | static int da9063_rtc_set_time(struct device *dev, struct rtc_time *tm) | |
139 | { | |
140 | struct da9063_rtc *rtc = dev_get_drvdata(dev); | |
141 | u8 data[RTC_DATA_LEN]; | |
142 | int ret; | |
143 | ||
144 | da9063_tm_to_data(tm, data); | |
145 | ret = regmap_bulk_write(rtc->hw->regmap, DA9063_REG_COUNT_S, | |
146 | data, RTC_DATA_LEN); | |
147 | if (ret < 0) | |
148 | dev_err(dev, "Failed to set RTC time data: %d\n", ret); | |
149 | ||
150 | return ret; | |
151 | } | |
152 | ||
153 | static int da9063_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
154 | { | |
155 | struct da9063_rtc *rtc = dev_get_drvdata(dev); | |
156 | u8 data[RTC_DATA_LEN]; | |
157 | int ret; | |
158 | unsigned int val; | |
159 | ||
9cb42e2a OST |
160 | data[RTC_SEC] = 0; |
161 | ret = regmap_bulk_read(rtc->hw->regmap, rtc->alarm_start, | |
162 | &data[rtc->data_start], rtc->alarm_len); | |
c2a57550 OST |
163 | if (ret < 0) |
164 | return ret; | |
165 | ||
166 | da9063_data_to_tm(data, &alrm->time); | |
167 | ||
168 | alrm->enabled = !!(data[RTC_YEAR] & DA9063_ALARM_ON); | |
169 | ||
170 | ret = regmap_read(rtc->hw->regmap, DA9063_REG_EVENT_A, &val); | |
171 | if (ret < 0) | |
172 | return ret; | |
173 | ||
174 | if (val & (DA9063_E_ALARM)) | |
175 | alrm->pending = 1; | |
176 | else | |
177 | alrm->pending = 0; | |
178 | ||
179 | return 0; | |
180 | } | |
181 | ||
182 | static int da9063_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
183 | { | |
184 | struct da9063_rtc *rtc = dev_get_drvdata(dev); | |
185 | u8 data[RTC_DATA_LEN]; | |
186 | int ret; | |
187 | ||
188 | da9063_tm_to_data(&alrm->time, data); | |
189 | ||
190 | ret = da9063_rtc_stop_alarm(dev); | |
191 | if (ret < 0) { | |
192 | dev_err(dev, "Failed to stop alarm: %d\n", ret); | |
193 | return ret; | |
194 | } | |
195 | ||
9cb42e2a OST |
196 | ret = regmap_bulk_write(rtc->hw->regmap, rtc->alarm_start, |
197 | &data[rtc->data_start], rtc->alarm_len); | |
c2a57550 OST |
198 | if (ret < 0) { |
199 | dev_err(dev, "Failed to write alarm: %d\n", ret); | |
200 | return ret; | |
201 | } | |
202 | ||
9cb42e2a | 203 | da9063_data_to_tm(data, &rtc->alarm_time); |
c2a57550 OST |
204 | |
205 | if (alrm->enabled) { | |
206 | ret = da9063_rtc_start_alarm(dev); | |
207 | if (ret < 0) { | |
208 | dev_err(dev, "Failed to start alarm: %d\n", ret); | |
209 | return ret; | |
210 | } | |
211 | } | |
212 | ||
213 | return ret; | |
214 | } | |
215 | ||
216 | static int da9063_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled) | |
217 | { | |
218 | if (enabled) | |
219 | return da9063_rtc_start_alarm(dev); | |
220 | else | |
221 | return da9063_rtc_stop_alarm(dev); | |
222 | } | |
223 | ||
224 | static irqreturn_t da9063_alarm_event(int irq, void *data) | |
225 | { | |
226 | struct da9063_rtc *rtc = data; | |
227 | ||
9cb42e2a | 228 | regmap_update_bits(rtc->hw->regmap, rtc->alarm_year, |
c2a57550 OST |
229 | DA9063_ALARM_ON, 0); |
230 | ||
231 | rtc->rtc_sync = true; | |
232 | rtc_update_irq(rtc->rtc_dev, 1, RTC_IRQF | RTC_AF); | |
233 | ||
234 | return IRQ_HANDLED; | |
235 | } | |
236 | ||
237 | static const struct rtc_class_ops da9063_rtc_ops = { | |
238 | .read_time = da9063_rtc_read_time, | |
239 | .set_time = da9063_rtc_set_time, | |
240 | .read_alarm = da9063_rtc_read_alarm, | |
241 | .set_alarm = da9063_rtc_set_alarm, | |
242 | .alarm_irq_enable = da9063_rtc_alarm_irq_enable, | |
243 | }; | |
244 | ||
245 | static int da9063_rtc_probe(struct platform_device *pdev) | |
246 | { | |
247 | struct da9063 *da9063 = dev_get_drvdata(pdev->dev.parent); | |
248 | struct da9063_rtc *rtc; | |
249 | int irq_alarm; | |
250 | u8 data[RTC_DATA_LEN]; | |
251 | int ret; | |
252 | ||
253 | ret = regmap_update_bits(da9063->regmap, DA9063_REG_CONTROL_E, | |
254 | DA9063_RTC_EN, DA9063_RTC_EN); | |
255 | if (ret < 0) { | |
256 | dev_err(&pdev->dev, "Failed to enable RTC\n"); | |
257 | goto err; | |
258 | } | |
259 | ||
260 | ret = regmap_update_bits(da9063->regmap, DA9063_REG_EN_32K, | |
261 | DA9063_CRYSTAL, DA9063_CRYSTAL); | |
262 | if (ret < 0) { | |
263 | dev_err(&pdev->dev, "Failed to run 32kHz oscillator\n"); | |
264 | goto err; | |
265 | } | |
266 | ||
9cb42e2a OST |
267 | rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL); |
268 | if (!rtc) | |
269 | return -ENOMEM; | |
270 | ||
271 | if (da9063->variant_code == PMIC_DA9063_AD) { | |
272 | rtc->alarm_year = DA9063_AD_REG_ALARM_Y; | |
273 | rtc->alarm_start = DA9063_AD_REG_ALARM_MI; | |
274 | rtc->alarm_len = RTC_ALARM_DATA_LEN; | |
275 | rtc->data_start = RTC_MIN; | |
276 | } else { | |
277 | rtc->alarm_year = DA9063_BB_REG_ALARM_Y; | |
278 | rtc->alarm_start = DA9063_BB_REG_ALARM_S; | |
279 | rtc->alarm_len = RTC_DATA_LEN; | |
280 | rtc->data_start = RTC_SEC; | |
281 | } | |
282 | ||
283 | ret = regmap_update_bits(da9063->regmap, rtc->alarm_start, | |
c2a57550 OST |
284 | DA9063_ALARM_STATUS_TICK | DA9063_ALARM_STATUS_ALARM, |
285 | 0); | |
286 | if (ret < 0) { | |
287 | dev_err(&pdev->dev, "Failed to access RTC alarm register\n"); | |
288 | goto err; | |
289 | } | |
290 | ||
9cb42e2a | 291 | ret = regmap_update_bits(da9063->regmap, rtc->alarm_start, |
c2a57550 OST |
292 | DA9063_ALARM_STATUS_ALARM, |
293 | DA9063_ALARM_STATUS_ALARM); | |
294 | if (ret < 0) { | |
295 | dev_err(&pdev->dev, "Failed to access RTC alarm register\n"); | |
296 | goto err; | |
297 | } | |
298 | ||
9cb42e2a | 299 | ret = regmap_update_bits(da9063->regmap, rtc->alarm_year, |
c2a57550 OST |
300 | DA9063_TICK_ON, 0); |
301 | if (ret < 0) { | |
302 | dev_err(&pdev->dev, "Failed to disable TICKs\n"); | |
303 | goto err; | |
304 | } | |
305 | ||
9cb42e2a OST |
306 | data[RTC_SEC] = 0; |
307 | ret = regmap_bulk_read(da9063->regmap, rtc->alarm_start, | |
308 | &data[rtc->data_start], rtc->alarm_len); | |
c2a57550 OST |
309 | if (ret < 0) { |
310 | dev_err(&pdev->dev, "Failed to read initial alarm data: %d\n", | |
311 | ret); | |
312 | goto err; | |
313 | } | |
314 | ||
c2a57550 OST |
315 | platform_set_drvdata(pdev, rtc); |
316 | ||
317 | irq_alarm = platform_get_irq_byname(pdev, "ALARM"); | |
318 | ret = devm_request_threaded_irq(&pdev->dev, irq_alarm, NULL, | |
319 | da9063_alarm_event, | |
320 | IRQF_TRIGGER_LOW | IRQF_ONESHOT, | |
321 | "ALARM", rtc); | |
322 | if (ret) { | |
323 | dev_err(&pdev->dev, "Failed to request ALARM IRQ %d: %d\n", | |
324 | irq_alarm, ret); | |
325 | goto err; | |
326 | } | |
327 | ||
328 | rtc->hw = da9063; | |
329 | rtc->rtc_dev = devm_rtc_device_register(&pdev->dev, DA9063_DRVNAME_RTC, | |
330 | &da9063_rtc_ops, THIS_MODULE); | |
331 | if (IS_ERR(rtc->rtc_dev)) | |
332 | return PTR_ERR(rtc->rtc_dev); | |
333 | ||
334 | da9063_data_to_tm(data, &rtc->alarm_time); | |
335 | rtc->rtc_sync = false; | |
336 | err: | |
337 | return ret; | |
338 | } | |
339 | ||
340 | static struct platform_driver da9063_rtc_driver = { | |
341 | .probe = da9063_rtc_probe, | |
342 | .driver = { | |
343 | .name = DA9063_DRVNAME_RTC, | |
344 | .owner = THIS_MODULE, | |
345 | }, | |
346 | }; | |
347 | ||
348 | module_platform_driver(da9063_rtc_driver); | |
349 | ||
350 | MODULE_AUTHOR("S Twiss <stwiss.opensource@diasemi.com>"); | |
351 | MODULE_DESCRIPTION("Real time clock device driver for Dialog DA9063"); | |
352 | MODULE_LICENSE("GPL v2"); | |
353 | MODULE_ALIAS("platform:" DA9063_DRVNAME_RTC); |