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eae854b2 BR |
1 | /* NXP PCF50633 RTC Driver |
2 | * | |
3 | * (C) 2006-2008 by Openmoko, Inc. | |
4 | * Author: Balaji Rao <balajirrao@openmoko.org> | |
5 | * All rights reserved. | |
6 | * | |
7 | * Broken down from monstrous PCF50633 driver mainly by | |
8 | * Harald Welte, Andy Green and Werner Almesberger | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify it | |
11 | * under the terms of the GNU General Public License as published by the | |
12 | * Free Software Foundation; either version 2 of the License, or (at your | |
13 | * option) any later version. | |
14 | * | |
15 | */ | |
16 | ||
17 | #include <linux/kernel.h> | |
18 | #include <linux/module.h> | |
19 | #include <linux/init.h> | |
20 | #include <linux/device.h> | |
5a0e3ad6 | 21 | #include <linux/slab.h> |
eae854b2 BR |
22 | #include <linux/platform_device.h> |
23 | #include <linux/rtc.h> | |
24 | #include <linux/bcd.h> | |
25 | #include <linux/err.h> | |
26 | ||
27 | #include <linux/mfd/pcf50633/core.h> | |
28 | ||
29 | #define PCF50633_REG_RTCSC 0x59 /* Second */ | |
30 | #define PCF50633_REG_RTCMN 0x5a /* Minute */ | |
31 | #define PCF50633_REG_RTCHR 0x5b /* Hour */ | |
32 | #define PCF50633_REG_RTCWD 0x5c /* Weekday */ | |
33 | #define PCF50633_REG_RTCDT 0x5d /* Day */ | |
34 | #define PCF50633_REG_RTCMT 0x5e /* Month */ | |
35 | #define PCF50633_REG_RTCYR 0x5f /* Year */ | |
36 | #define PCF50633_REG_RTCSCA 0x60 /* Alarm Second */ | |
37 | #define PCF50633_REG_RTCMNA 0x61 /* Alarm Minute */ | |
38 | #define PCF50633_REG_RTCHRA 0x62 /* Alarm Hour */ | |
39 | #define PCF50633_REG_RTCWDA 0x63 /* Alarm Weekday */ | |
40 | #define PCF50633_REG_RTCDTA 0x64 /* Alarm Day */ | |
41 | #define PCF50633_REG_RTCMTA 0x65 /* Alarm Month */ | |
42 | #define PCF50633_REG_RTCYRA 0x66 /* Alarm Year */ | |
43 | ||
44 | enum pcf50633_time_indexes { | |
45 | PCF50633_TI_SEC, | |
46 | PCF50633_TI_MIN, | |
47 | PCF50633_TI_HOUR, | |
48 | PCF50633_TI_WKDAY, | |
49 | PCF50633_TI_DAY, | |
50 | PCF50633_TI_MONTH, | |
51 | PCF50633_TI_YEAR, | |
52 | PCF50633_TI_EXTENT /* always last */ | |
53 | }; | |
54 | ||
55 | struct pcf50633_time { | |
56 | u_int8_t time[PCF50633_TI_EXTENT]; | |
57 | }; | |
58 | ||
59 | struct pcf50633_rtc { | |
60 | int alarm_enabled; | |
61 | int second_enabled; | |
a766ae3e | 62 | int alarm_pending; |
eae854b2 BR |
63 | |
64 | struct pcf50633 *pcf; | |
65 | struct rtc_device *rtc_dev; | |
66 | }; | |
67 | ||
68 | static void pcf2rtc_time(struct rtc_time *rtc, struct pcf50633_time *pcf) | |
69 | { | |
70 | rtc->tm_sec = bcd2bin(pcf->time[PCF50633_TI_SEC]); | |
71 | rtc->tm_min = bcd2bin(pcf->time[PCF50633_TI_MIN]); | |
72 | rtc->tm_hour = bcd2bin(pcf->time[PCF50633_TI_HOUR]); | |
73 | rtc->tm_wday = bcd2bin(pcf->time[PCF50633_TI_WKDAY]); | |
74 | rtc->tm_mday = bcd2bin(pcf->time[PCF50633_TI_DAY]); | |
265f2a05 | 75 | rtc->tm_mon = bcd2bin(pcf->time[PCF50633_TI_MONTH]) - 1; |
eae854b2 BR |
76 | rtc->tm_year = bcd2bin(pcf->time[PCF50633_TI_YEAR]) + 100; |
77 | } | |
78 | ||
79 | static void rtc2pcf_time(struct pcf50633_time *pcf, struct rtc_time *rtc) | |
80 | { | |
81 | pcf->time[PCF50633_TI_SEC] = bin2bcd(rtc->tm_sec); | |
82 | pcf->time[PCF50633_TI_MIN] = bin2bcd(rtc->tm_min); | |
83 | pcf->time[PCF50633_TI_HOUR] = bin2bcd(rtc->tm_hour); | |
84 | pcf->time[PCF50633_TI_WKDAY] = bin2bcd(rtc->tm_wday); | |
85 | pcf->time[PCF50633_TI_DAY] = bin2bcd(rtc->tm_mday); | |
265f2a05 | 86 | pcf->time[PCF50633_TI_MONTH] = bin2bcd(rtc->tm_mon + 1); |
eae854b2 BR |
87 | pcf->time[PCF50633_TI_YEAR] = bin2bcd(rtc->tm_year % 100); |
88 | } | |
89 | ||
90 | static int | |
91 | pcf50633_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled) | |
92 | { | |
93 | struct pcf50633_rtc *rtc = dev_get_drvdata(dev); | |
94 | int err; | |
95 | ||
96 | if (enabled) | |
97 | err = pcf50633_irq_unmask(rtc->pcf, PCF50633_IRQ_ALARM); | |
98 | else | |
99 | err = pcf50633_irq_mask(rtc->pcf, PCF50633_IRQ_ALARM); | |
100 | ||
101 | if (err < 0) | |
102 | return err; | |
103 | ||
104 | rtc->alarm_enabled = enabled; | |
105 | ||
106 | return 0; | |
107 | } | |
108 | ||
109 | static int | |
110 | pcf50633_rtc_update_irq_enable(struct device *dev, unsigned int enabled) | |
111 | { | |
112 | struct pcf50633_rtc *rtc = dev_get_drvdata(dev); | |
113 | int err; | |
114 | ||
115 | if (enabled) | |
116 | err = pcf50633_irq_unmask(rtc->pcf, PCF50633_IRQ_SECOND); | |
117 | else | |
118 | err = pcf50633_irq_mask(rtc->pcf, PCF50633_IRQ_SECOND); | |
119 | ||
120 | if (err < 0) | |
121 | return err; | |
122 | ||
123 | rtc->second_enabled = enabled; | |
124 | ||
125 | return 0; | |
126 | } | |
127 | ||
128 | static int pcf50633_rtc_read_time(struct device *dev, struct rtc_time *tm) | |
129 | { | |
130 | struct pcf50633_rtc *rtc; | |
131 | struct pcf50633_time pcf_tm; | |
132 | int ret; | |
133 | ||
134 | rtc = dev_get_drvdata(dev); | |
135 | ||
136 | ret = pcf50633_read_block(rtc->pcf, PCF50633_REG_RTCSC, | |
137 | PCF50633_TI_EXTENT, | |
138 | &pcf_tm.time[0]); | |
139 | if (ret != PCF50633_TI_EXTENT) { | |
140 | dev_err(dev, "Failed to read time\n"); | |
141 | return -EIO; | |
142 | } | |
143 | ||
144 | dev_dbg(dev, "PCF_TIME: %02x.%02x.%02x %02x:%02x:%02x\n", | |
145 | pcf_tm.time[PCF50633_TI_DAY], | |
146 | pcf_tm.time[PCF50633_TI_MONTH], | |
147 | pcf_tm.time[PCF50633_TI_YEAR], | |
148 | pcf_tm.time[PCF50633_TI_HOUR], | |
149 | pcf_tm.time[PCF50633_TI_MIN], | |
150 | pcf_tm.time[PCF50633_TI_SEC]); | |
151 | ||
152 | pcf2rtc_time(tm, &pcf_tm); | |
153 | ||
154 | dev_dbg(dev, "RTC_TIME: %u.%u.%u %u:%u:%u\n", | |
155 | tm->tm_mday, tm->tm_mon, tm->tm_year, | |
156 | tm->tm_hour, tm->tm_min, tm->tm_sec); | |
157 | ||
158 | return rtc_valid_tm(tm); | |
159 | } | |
160 | ||
161 | static int pcf50633_rtc_set_time(struct device *dev, struct rtc_time *tm) | |
162 | { | |
163 | struct pcf50633_rtc *rtc; | |
164 | struct pcf50633_time pcf_tm; | |
165 | int second_masked, alarm_masked, ret = 0; | |
166 | ||
167 | rtc = dev_get_drvdata(dev); | |
168 | ||
169 | dev_dbg(dev, "RTC_TIME: %u.%u.%u %u:%u:%u\n", | |
170 | tm->tm_mday, tm->tm_mon, tm->tm_year, | |
171 | tm->tm_hour, tm->tm_min, tm->tm_sec); | |
172 | ||
173 | rtc2pcf_time(&pcf_tm, tm); | |
174 | ||
175 | dev_dbg(dev, "PCF_TIME: %02x.%02x.%02x %02x:%02x:%02x\n", | |
176 | pcf_tm.time[PCF50633_TI_DAY], | |
177 | pcf_tm.time[PCF50633_TI_MONTH], | |
178 | pcf_tm.time[PCF50633_TI_YEAR], | |
179 | pcf_tm.time[PCF50633_TI_HOUR], | |
180 | pcf_tm.time[PCF50633_TI_MIN], | |
181 | pcf_tm.time[PCF50633_TI_SEC]); | |
182 | ||
183 | ||
184 | second_masked = pcf50633_irq_mask_get(rtc->pcf, PCF50633_IRQ_SECOND); | |
185 | alarm_masked = pcf50633_irq_mask_get(rtc->pcf, PCF50633_IRQ_ALARM); | |
186 | ||
187 | if (!second_masked) | |
188 | pcf50633_irq_mask(rtc->pcf, PCF50633_IRQ_SECOND); | |
189 | if (!alarm_masked) | |
190 | pcf50633_irq_mask(rtc->pcf, PCF50633_IRQ_ALARM); | |
191 | ||
192 | /* Returns 0 on success */ | |
193 | ret = pcf50633_write_block(rtc->pcf, PCF50633_REG_RTCSC, | |
194 | PCF50633_TI_EXTENT, | |
195 | &pcf_tm.time[0]); | |
196 | ||
197 | if (!second_masked) | |
198 | pcf50633_irq_unmask(rtc->pcf, PCF50633_IRQ_SECOND); | |
199 | if (!alarm_masked) | |
200 | pcf50633_irq_unmask(rtc->pcf, PCF50633_IRQ_ALARM); | |
201 | ||
202 | return ret; | |
203 | } | |
204 | ||
205 | static int pcf50633_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
206 | { | |
207 | struct pcf50633_rtc *rtc; | |
208 | struct pcf50633_time pcf_tm; | |
209 | int ret = 0; | |
210 | ||
211 | rtc = dev_get_drvdata(dev); | |
212 | ||
213 | alrm->enabled = rtc->alarm_enabled; | |
a766ae3e | 214 | alrm->pending = rtc->alarm_pending; |
eae854b2 BR |
215 | |
216 | ret = pcf50633_read_block(rtc->pcf, PCF50633_REG_RTCSCA, | |
217 | PCF50633_TI_EXTENT, &pcf_tm.time[0]); | |
218 | if (ret != PCF50633_TI_EXTENT) { | |
219 | dev_err(dev, "Failed to read time\n"); | |
220 | return -EIO; | |
221 | } | |
222 | ||
223 | pcf2rtc_time(&alrm->time, &pcf_tm); | |
224 | ||
225 | return rtc_valid_tm(&alrm->time); | |
226 | } | |
227 | ||
228 | static int pcf50633_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
229 | { | |
230 | struct pcf50633_rtc *rtc; | |
231 | struct pcf50633_time pcf_tm; | |
232 | int alarm_masked, ret = 0; | |
233 | ||
234 | rtc = dev_get_drvdata(dev); | |
235 | ||
236 | rtc2pcf_time(&pcf_tm, &alrm->time); | |
237 | ||
238 | /* do like mktime does and ignore tm_wday */ | |
239 | pcf_tm.time[PCF50633_TI_WKDAY] = 7; | |
240 | ||
241 | alarm_masked = pcf50633_irq_mask_get(rtc->pcf, PCF50633_IRQ_ALARM); | |
242 | ||
243 | /* disable alarm interrupt */ | |
244 | if (!alarm_masked) | |
245 | pcf50633_irq_mask(rtc->pcf, PCF50633_IRQ_ALARM); | |
246 | ||
247 | /* Returns 0 on success */ | |
248 | ret = pcf50633_write_block(rtc->pcf, PCF50633_REG_RTCSCA, | |
249 | PCF50633_TI_EXTENT, &pcf_tm.time[0]); | |
a766ae3e WA |
250 | if (!alrm->enabled) |
251 | rtc->alarm_pending = 0; | |
eae854b2 | 252 | |
05f45d7d | 253 | if (!alarm_masked || alrm->enabled) |
eae854b2 | 254 | pcf50633_irq_unmask(rtc->pcf, PCF50633_IRQ_ALARM); |
05f45d7d | 255 | rtc->alarm_enabled = alrm->enabled; |
eae854b2 BR |
256 | |
257 | return ret; | |
258 | } | |
259 | ||
260 | static struct rtc_class_ops pcf50633_rtc_ops = { | |
261 | .read_time = pcf50633_rtc_read_time, | |
262 | .set_time = pcf50633_rtc_set_time, | |
263 | .read_alarm = pcf50633_rtc_read_alarm, | |
264 | .set_alarm = pcf50633_rtc_set_alarm, | |
265 | .alarm_irq_enable = pcf50633_rtc_alarm_irq_enable, | |
266 | .update_irq_enable = pcf50633_rtc_update_irq_enable, | |
267 | }; | |
268 | ||
269 | static void pcf50633_rtc_irq(int irq, void *data) | |
270 | { | |
271 | struct pcf50633_rtc *rtc = data; | |
272 | ||
273 | switch (irq) { | |
274 | case PCF50633_IRQ_ALARM: | |
275 | rtc_update_irq(rtc->rtc_dev, 1, RTC_AF | RTC_IRQF); | |
a766ae3e | 276 | rtc->alarm_pending = 1; |
eae854b2 BR |
277 | break; |
278 | case PCF50633_IRQ_SECOND: | |
279 | rtc_update_irq(rtc->rtc_dev, 1, RTC_UF | RTC_IRQF); | |
280 | break; | |
281 | } | |
282 | } | |
283 | ||
284 | static int __devinit pcf50633_rtc_probe(struct platform_device *pdev) | |
285 | { | |
eae854b2 BR |
286 | struct pcf50633_rtc *rtc; |
287 | ||
eae854b2 BR |
288 | rtc = kzalloc(sizeof(*rtc), GFP_KERNEL); |
289 | if (!rtc) | |
290 | return -ENOMEM; | |
291 | ||
68d641ef | 292 | rtc->pcf = dev_to_pcf50633(pdev->dev.parent); |
eae854b2 BR |
293 | platform_set_drvdata(pdev, rtc); |
294 | rtc->rtc_dev = rtc_device_register("pcf50633-rtc", &pdev->dev, | |
295 | &pcf50633_rtc_ops, THIS_MODULE); | |
296 | ||
297 | if (IS_ERR(rtc->rtc_dev)) { | |
fa00e106 | 298 | int ret = PTR_ERR(rtc->rtc_dev); |
eae854b2 | 299 | kfree(rtc); |
fa00e106 | 300 | return ret; |
eae854b2 BR |
301 | } |
302 | ||
303 | pcf50633_register_irq(rtc->pcf, PCF50633_IRQ_ALARM, | |
304 | pcf50633_rtc_irq, rtc); | |
305 | pcf50633_register_irq(rtc->pcf, PCF50633_IRQ_SECOND, | |
306 | pcf50633_rtc_irq, rtc); | |
307 | ||
308 | return 0; | |
309 | } | |
310 | ||
311 | static int __devexit pcf50633_rtc_remove(struct platform_device *pdev) | |
312 | { | |
313 | struct pcf50633_rtc *rtc; | |
314 | ||
315 | rtc = platform_get_drvdata(pdev); | |
316 | ||
317 | pcf50633_free_irq(rtc->pcf, PCF50633_IRQ_ALARM); | |
318 | pcf50633_free_irq(rtc->pcf, PCF50633_IRQ_SECOND); | |
319 | ||
320 | rtc_device_unregister(rtc->rtc_dev); | |
321 | kfree(rtc); | |
322 | ||
323 | return 0; | |
324 | } | |
325 | ||
326 | static struct platform_driver pcf50633_rtc_driver = { | |
327 | .driver = { | |
328 | .name = "pcf50633-rtc", | |
329 | }, | |
330 | .probe = pcf50633_rtc_probe, | |
331 | .remove = __devexit_p(pcf50633_rtc_remove), | |
332 | }; | |
333 | ||
334 | static int __init pcf50633_rtc_init(void) | |
335 | { | |
336 | return platform_driver_register(&pcf50633_rtc_driver); | |
337 | } | |
338 | module_init(pcf50633_rtc_init); | |
339 | ||
340 | static void __exit pcf50633_rtc_exit(void) | |
341 | { | |
342 | platform_driver_unregister(&pcf50633_rtc_driver); | |
343 | } | |
344 | module_exit(pcf50633_rtc_exit); | |
345 | ||
346 | MODULE_DESCRIPTION("PCF50633 RTC driver"); | |
347 | MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>"); | |
348 | MODULE_LICENSE("GPL"); | |
349 |