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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> | |
21 | #include <linux/platform_device.h> | |
22 | #include <linux/rtc.h> | |
23 | #include <linux/bcd.h> | |
24 | #include <linux/err.h> | |
25 | ||
26 | #include <linux/mfd/pcf50633/core.h> | |
27 | ||
28 | #define PCF50633_REG_RTCSC 0x59 /* Second */ | |
29 | #define PCF50633_REG_RTCMN 0x5a /* Minute */ | |
30 | #define PCF50633_REG_RTCHR 0x5b /* Hour */ | |
31 | #define PCF50633_REG_RTCWD 0x5c /* Weekday */ | |
32 | #define PCF50633_REG_RTCDT 0x5d /* Day */ | |
33 | #define PCF50633_REG_RTCMT 0x5e /* Month */ | |
34 | #define PCF50633_REG_RTCYR 0x5f /* Year */ | |
35 | #define PCF50633_REG_RTCSCA 0x60 /* Alarm Second */ | |
36 | #define PCF50633_REG_RTCMNA 0x61 /* Alarm Minute */ | |
37 | #define PCF50633_REG_RTCHRA 0x62 /* Alarm Hour */ | |
38 | #define PCF50633_REG_RTCWDA 0x63 /* Alarm Weekday */ | |
39 | #define PCF50633_REG_RTCDTA 0x64 /* Alarm Day */ | |
40 | #define PCF50633_REG_RTCMTA 0x65 /* Alarm Month */ | |
41 | #define PCF50633_REG_RTCYRA 0x66 /* Alarm Year */ | |
42 | ||
43 | enum pcf50633_time_indexes { | |
44 | PCF50633_TI_SEC, | |
45 | PCF50633_TI_MIN, | |
46 | PCF50633_TI_HOUR, | |
47 | PCF50633_TI_WKDAY, | |
48 | PCF50633_TI_DAY, | |
49 | PCF50633_TI_MONTH, | |
50 | PCF50633_TI_YEAR, | |
51 | PCF50633_TI_EXTENT /* always last */ | |
52 | }; | |
53 | ||
54 | struct pcf50633_time { | |
55 | u_int8_t time[PCF50633_TI_EXTENT]; | |
56 | }; | |
57 | ||
58 | struct pcf50633_rtc { | |
59 | int alarm_enabled; | |
60 | int second_enabled; | |
61 | ||
62 | struct pcf50633 *pcf; | |
63 | struct rtc_device *rtc_dev; | |
64 | }; | |
65 | ||
66 | static void pcf2rtc_time(struct rtc_time *rtc, struct pcf50633_time *pcf) | |
67 | { | |
68 | rtc->tm_sec = bcd2bin(pcf->time[PCF50633_TI_SEC]); | |
69 | rtc->tm_min = bcd2bin(pcf->time[PCF50633_TI_MIN]); | |
70 | rtc->tm_hour = bcd2bin(pcf->time[PCF50633_TI_HOUR]); | |
71 | rtc->tm_wday = bcd2bin(pcf->time[PCF50633_TI_WKDAY]); | |
72 | rtc->tm_mday = bcd2bin(pcf->time[PCF50633_TI_DAY]); | |
73 | rtc->tm_mon = bcd2bin(pcf->time[PCF50633_TI_MONTH]); | |
74 | rtc->tm_year = bcd2bin(pcf->time[PCF50633_TI_YEAR]) + 100; | |
75 | } | |
76 | ||
77 | static void rtc2pcf_time(struct pcf50633_time *pcf, struct rtc_time *rtc) | |
78 | { | |
79 | pcf->time[PCF50633_TI_SEC] = bin2bcd(rtc->tm_sec); | |
80 | pcf->time[PCF50633_TI_MIN] = bin2bcd(rtc->tm_min); | |
81 | pcf->time[PCF50633_TI_HOUR] = bin2bcd(rtc->tm_hour); | |
82 | pcf->time[PCF50633_TI_WKDAY] = bin2bcd(rtc->tm_wday); | |
83 | pcf->time[PCF50633_TI_DAY] = bin2bcd(rtc->tm_mday); | |
84 | pcf->time[PCF50633_TI_MONTH] = bin2bcd(rtc->tm_mon); | |
85 | pcf->time[PCF50633_TI_YEAR] = bin2bcd(rtc->tm_year % 100); | |
86 | } | |
87 | ||
88 | static int | |
89 | pcf50633_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled) | |
90 | { | |
91 | struct pcf50633_rtc *rtc = dev_get_drvdata(dev); | |
92 | int err; | |
93 | ||
94 | if (enabled) | |
95 | err = pcf50633_irq_unmask(rtc->pcf, PCF50633_IRQ_ALARM); | |
96 | else | |
97 | err = pcf50633_irq_mask(rtc->pcf, PCF50633_IRQ_ALARM); | |
98 | ||
99 | if (err < 0) | |
100 | return err; | |
101 | ||
102 | rtc->alarm_enabled = enabled; | |
103 | ||
104 | return 0; | |
105 | } | |
106 | ||
107 | static int | |
108 | pcf50633_rtc_update_irq_enable(struct device *dev, unsigned int enabled) | |
109 | { | |
110 | struct pcf50633_rtc *rtc = dev_get_drvdata(dev); | |
111 | int err; | |
112 | ||
113 | if (enabled) | |
114 | err = pcf50633_irq_unmask(rtc->pcf, PCF50633_IRQ_SECOND); | |
115 | else | |
116 | err = pcf50633_irq_mask(rtc->pcf, PCF50633_IRQ_SECOND); | |
117 | ||
118 | if (err < 0) | |
119 | return err; | |
120 | ||
121 | rtc->second_enabled = enabled; | |
122 | ||
123 | return 0; | |
124 | } | |
125 | ||
126 | static int pcf50633_rtc_read_time(struct device *dev, struct rtc_time *tm) | |
127 | { | |
128 | struct pcf50633_rtc *rtc; | |
129 | struct pcf50633_time pcf_tm; | |
130 | int ret; | |
131 | ||
132 | rtc = dev_get_drvdata(dev); | |
133 | ||
134 | ret = pcf50633_read_block(rtc->pcf, PCF50633_REG_RTCSC, | |
135 | PCF50633_TI_EXTENT, | |
136 | &pcf_tm.time[0]); | |
137 | if (ret != PCF50633_TI_EXTENT) { | |
138 | dev_err(dev, "Failed to read time\n"); | |
139 | return -EIO; | |
140 | } | |
141 | ||
142 | dev_dbg(dev, "PCF_TIME: %02x.%02x.%02x %02x:%02x:%02x\n", | |
143 | pcf_tm.time[PCF50633_TI_DAY], | |
144 | pcf_tm.time[PCF50633_TI_MONTH], | |
145 | pcf_tm.time[PCF50633_TI_YEAR], | |
146 | pcf_tm.time[PCF50633_TI_HOUR], | |
147 | pcf_tm.time[PCF50633_TI_MIN], | |
148 | pcf_tm.time[PCF50633_TI_SEC]); | |
149 | ||
150 | pcf2rtc_time(tm, &pcf_tm); | |
151 | ||
152 | dev_dbg(dev, "RTC_TIME: %u.%u.%u %u:%u:%u\n", | |
153 | tm->tm_mday, tm->tm_mon, tm->tm_year, | |
154 | tm->tm_hour, tm->tm_min, tm->tm_sec); | |
155 | ||
156 | return rtc_valid_tm(tm); | |
157 | } | |
158 | ||
159 | static int pcf50633_rtc_set_time(struct device *dev, struct rtc_time *tm) | |
160 | { | |
161 | struct pcf50633_rtc *rtc; | |
162 | struct pcf50633_time pcf_tm; | |
163 | int second_masked, alarm_masked, ret = 0; | |
164 | ||
165 | rtc = dev_get_drvdata(dev); | |
166 | ||
167 | dev_dbg(dev, "RTC_TIME: %u.%u.%u %u:%u:%u\n", | |
168 | tm->tm_mday, tm->tm_mon, tm->tm_year, | |
169 | tm->tm_hour, tm->tm_min, tm->tm_sec); | |
170 | ||
171 | rtc2pcf_time(&pcf_tm, tm); | |
172 | ||
173 | dev_dbg(dev, "PCF_TIME: %02x.%02x.%02x %02x:%02x:%02x\n", | |
174 | pcf_tm.time[PCF50633_TI_DAY], | |
175 | pcf_tm.time[PCF50633_TI_MONTH], | |
176 | pcf_tm.time[PCF50633_TI_YEAR], | |
177 | pcf_tm.time[PCF50633_TI_HOUR], | |
178 | pcf_tm.time[PCF50633_TI_MIN], | |
179 | pcf_tm.time[PCF50633_TI_SEC]); | |
180 | ||
181 | ||
182 | second_masked = pcf50633_irq_mask_get(rtc->pcf, PCF50633_IRQ_SECOND); | |
183 | alarm_masked = pcf50633_irq_mask_get(rtc->pcf, PCF50633_IRQ_ALARM); | |
184 | ||
185 | if (!second_masked) | |
186 | pcf50633_irq_mask(rtc->pcf, PCF50633_IRQ_SECOND); | |
187 | if (!alarm_masked) | |
188 | pcf50633_irq_mask(rtc->pcf, PCF50633_IRQ_ALARM); | |
189 | ||
190 | /* Returns 0 on success */ | |
191 | ret = pcf50633_write_block(rtc->pcf, PCF50633_REG_RTCSC, | |
192 | PCF50633_TI_EXTENT, | |
193 | &pcf_tm.time[0]); | |
194 | ||
195 | if (!second_masked) | |
196 | pcf50633_irq_unmask(rtc->pcf, PCF50633_IRQ_SECOND); | |
197 | if (!alarm_masked) | |
198 | pcf50633_irq_unmask(rtc->pcf, PCF50633_IRQ_ALARM); | |
199 | ||
200 | return ret; | |
201 | } | |
202 | ||
203 | static int pcf50633_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
204 | { | |
205 | struct pcf50633_rtc *rtc; | |
206 | struct pcf50633_time pcf_tm; | |
207 | int ret = 0; | |
208 | ||
209 | rtc = dev_get_drvdata(dev); | |
210 | ||
211 | alrm->enabled = rtc->alarm_enabled; | |
212 | ||
213 | ret = pcf50633_read_block(rtc->pcf, PCF50633_REG_RTCSCA, | |
214 | PCF50633_TI_EXTENT, &pcf_tm.time[0]); | |
215 | if (ret != PCF50633_TI_EXTENT) { | |
216 | dev_err(dev, "Failed to read time\n"); | |
217 | return -EIO; | |
218 | } | |
219 | ||
220 | pcf2rtc_time(&alrm->time, &pcf_tm); | |
221 | ||
222 | return rtc_valid_tm(&alrm->time); | |
223 | } | |
224 | ||
225 | static int pcf50633_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
226 | { | |
227 | struct pcf50633_rtc *rtc; | |
228 | struct pcf50633_time pcf_tm; | |
229 | int alarm_masked, ret = 0; | |
230 | ||
231 | rtc = dev_get_drvdata(dev); | |
232 | ||
233 | rtc2pcf_time(&pcf_tm, &alrm->time); | |
234 | ||
235 | /* do like mktime does and ignore tm_wday */ | |
236 | pcf_tm.time[PCF50633_TI_WKDAY] = 7; | |
237 | ||
238 | alarm_masked = pcf50633_irq_mask_get(rtc->pcf, PCF50633_IRQ_ALARM); | |
239 | ||
240 | /* disable alarm interrupt */ | |
241 | if (!alarm_masked) | |
242 | pcf50633_irq_mask(rtc->pcf, PCF50633_IRQ_ALARM); | |
243 | ||
244 | /* Returns 0 on success */ | |
245 | ret = pcf50633_write_block(rtc->pcf, PCF50633_REG_RTCSCA, | |
246 | PCF50633_TI_EXTENT, &pcf_tm.time[0]); | |
247 | ||
248 | if (!alarm_masked) | |
249 | pcf50633_irq_unmask(rtc->pcf, PCF50633_IRQ_ALARM); | |
250 | ||
251 | return ret; | |
252 | } | |
253 | ||
254 | static struct rtc_class_ops pcf50633_rtc_ops = { | |
255 | .read_time = pcf50633_rtc_read_time, | |
256 | .set_time = pcf50633_rtc_set_time, | |
257 | .read_alarm = pcf50633_rtc_read_alarm, | |
258 | .set_alarm = pcf50633_rtc_set_alarm, | |
259 | .alarm_irq_enable = pcf50633_rtc_alarm_irq_enable, | |
260 | .update_irq_enable = pcf50633_rtc_update_irq_enable, | |
261 | }; | |
262 | ||
263 | static void pcf50633_rtc_irq(int irq, void *data) | |
264 | { | |
265 | struct pcf50633_rtc *rtc = data; | |
266 | ||
267 | switch (irq) { | |
268 | case PCF50633_IRQ_ALARM: | |
269 | rtc_update_irq(rtc->rtc_dev, 1, RTC_AF | RTC_IRQF); | |
270 | break; | |
271 | case PCF50633_IRQ_SECOND: | |
272 | rtc_update_irq(rtc->rtc_dev, 1, RTC_UF | RTC_IRQF); | |
273 | break; | |
274 | } | |
275 | } | |
276 | ||
277 | static int __devinit pcf50633_rtc_probe(struct platform_device *pdev) | |
278 | { | |
279 | struct pcf50633_subdev_pdata *pdata; | |
280 | struct pcf50633_rtc *rtc; | |
281 | ||
282 | ||
283 | rtc = kzalloc(sizeof(*rtc), GFP_KERNEL); | |
284 | if (!rtc) | |
285 | return -ENOMEM; | |
286 | ||
287 | pdata = pdev->dev.platform_data; | |
288 | rtc->pcf = pdata->pcf; | |
289 | platform_set_drvdata(pdev, rtc); | |
290 | rtc->rtc_dev = rtc_device_register("pcf50633-rtc", &pdev->dev, | |
291 | &pcf50633_rtc_ops, THIS_MODULE); | |
292 | ||
293 | if (IS_ERR(rtc->rtc_dev)) { | |
294 | kfree(rtc); | |
295 | return PTR_ERR(rtc->rtc_dev); | |
296 | } | |
297 | ||
298 | pcf50633_register_irq(rtc->pcf, PCF50633_IRQ_ALARM, | |
299 | pcf50633_rtc_irq, rtc); | |
300 | pcf50633_register_irq(rtc->pcf, PCF50633_IRQ_SECOND, | |
301 | pcf50633_rtc_irq, rtc); | |
302 | ||
303 | return 0; | |
304 | } | |
305 | ||
306 | static int __devexit pcf50633_rtc_remove(struct platform_device *pdev) | |
307 | { | |
308 | struct pcf50633_rtc *rtc; | |
309 | ||
310 | rtc = platform_get_drvdata(pdev); | |
311 | ||
312 | pcf50633_free_irq(rtc->pcf, PCF50633_IRQ_ALARM); | |
313 | pcf50633_free_irq(rtc->pcf, PCF50633_IRQ_SECOND); | |
314 | ||
315 | rtc_device_unregister(rtc->rtc_dev); | |
316 | kfree(rtc); | |
317 | ||
318 | return 0; | |
319 | } | |
320 | ||
321 | static struct platform_driver pcf50633_rtc_driver = { | |
322 | .driver = { | |
323 | .name = "pcf50633-rtc", | |
324 | }, | |
325 | .probe = pcf50633_rtc_probe, | |
326 | .remove = __devexit_p(pcf50633_rtc_remove), | |
327 | }; | |
328 | ||
329 | static int __init pcf50633_rtc_init(void) | |
330 | { | |
331 | return platform_driver_register(&pcf50633_rtc_driver); | |
332 | } | |
333 | module_init(pcf50633_rtc_init); | |
334 | ||
335 | static void __exit pcf50633_rtc_exit(void) | |
336 | { | |
337 | platform_driver_unregister(&pcf50633_rtc_driver); | |
338 | } | |
339 | module_exit(pcf50633_rtc_exit); | |
340 | ||
341 | MODULE_DESCRIPTION("PCF50633 RTC driver"); | |
342 | MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>"); | |
343 | MODULE_LICENSE("GPL"); | |
344 |