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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; | |
a766ae3e | 61 | int alarm_pending; |
eae854b2 BR |
62 | |
63 | struct pcf50633 *pcf; | |
64 | struct rtc_device *rtc_dev; | |
65 | }; | |
66 | ||
67 | static void pcf2rtc_time(struct rtc_time *rtc, struct pcf50633_time *pcf) | |
68 | { | |
69 | rtc->tm_sec = bcd2bin(pcf->time[PCF50633_TI_SEC]); | |
70 | rtc->tm_min = bcd2bin(pcf->time[PCF50633_TI_MIN]); | |
71 | rtc->tm_hour = bcd2bin(pcf->time[PCF50633_TI_HOUR]); | |
72 | rtc->tm_wday = bcd2bin(pcf->time[PCF50633_TI_WKDAY]); | |
73 | rtc->tm_mday = bcd2bin(pcf->time[PCF50633_TI_DAY]); | |
265f2a05 | 74 | rtc->tm_mon = bcd2bin(pcf->time[PCF50633_TI_MONTH]) - 1; |
eae854b2 BR |
75 | rtc->tm_year = bcd2bin(pcf->time[PCF50633_TI_YEAR]) + 100; |
76 | } | |
77 | ||
78 | static void rtc2pcf_time(struct pcf50633_time *pcf, struct rtc_time *rtc) | |
79 | { | |
80 | pcf->time[PCF50633_TI_SEC] = bin2bcd(rtc->tm_sec); | |
81 | pcf->time[PCF50633_TI_MIN] = bin2bcd(rtc->tm_min); | |
82 | pcf->time[PCF50633_TI_HOUR] = bin2bcd(rtc->tm_hour); | |
83 | pcf->time[PCF50633_TI_WKDAY] = bin2bcd(rtc->tm_wday); | |
84 | pcf->time[PCF50633_TI_DAY] = bin2bcd(rtc->tm_mday); | |
265f2a05 | 85 | pcf->time[PCF50633_TI_MONTH] = bin2bcd(rtc->tm_mon + 1); |
eae854b2 BR |
86 | pcf->time[PCF50633_TI_YEAR] = bin2bcd(rtc->tm_year % 100); |
87 | } | |
88 | ||
89 | static int | |
90 | pcf50633_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled) | |
91 | { | |
92 | struct pcf50633_rtc *rtc = dev_get_drvdata(dev); | |
93 | int err; | |
94 | ||
95 | if (enabled) | |
96 | err = pcf50633_irq_unmask(rtc->pcf, PCF50633_IRQ_ALARM); | |
97 | else | |
98 | err = pcf50633_irq_mask(rtc->pcf, PCF50633_IRQ_ALARM); | |
99 | ||
100 | if (err < 0) | |
101 | return err; | |
102 | ||
103 | rtc->alarm_enabled = enabled; | |
104 | ||
105 | return 0; | |
106 | } | |
107 | ||
eae854b2 BR |
108 | static int pcf50633_rtc_read_time(struct device *dev, struct rtc_time *tm) |
109 | { | |
110 | struct pcf50633_rtc *rtc; | |
111 | struct pcf50633_time pcf_tm; | |
112 | int ret; | |
113 | ||
114 | rtc = dev_get_drvdata(dev); | |
115 | ||
116 | ret = pcf50633_read_block(rtc->pcf, PCF50633_REG_RTCSC, | |
117 | PCF50633_TI_EXTENT, | |
118 | &pcf_tm.time[0]); | |
119 | if (ret != PCF50633_TI_EXTENT) { | |
120 | dev_err(dev, "Failed to read time\n"); | |
121 | return -EIO; | |
122 | } | |
123 | ||
124 | dev_dbg(dev, "PCF_TIME: %02x.%02x.%02x %02x:%02x:%02x\n", | |
125 | pcf_tm.time[PCF50633_TI_DAY], | |
126 | pcf_tm.time[PCF50633_TI_MONTH], | |
127 | pcf_tm.time[PCF50633_TI_YEAR], | |
128 | pcf_tm.time[PCF50633_TI_HOUR], | |
129 | pcf_tm.time[PCF50633_TI_MIN], | |
130 | pcf_tm.time[PCF50633_TI_SEC]); | |
131 | ||
132 | pcf2rtc_time(tm, &pcf_tm); | |
133 | ||
134 | dev_dbg(dev, "RTC_TIME: %u.%u.%u %u:%u:%u\n", | |
135 | tm->tm_mday, tm->tm_mon, tm->tm_year, | |
136 | tm->tm_hour, tm->tm_min, tm->tm_sec); | |
137 | ||
138 | return rtc_valid_tm(tm); | |
139 | } | |
140 | ||
141 | static int pcf50633_rtc_set_time(struct device *dev, struct rtc_time *tm) | |
142 | { | |
143 | struct pcf50633_rtc *rtc; | |
144 | struct pcf50633_time pcf_tm; | |
3d62b8f5 | 145 | int alarm_masked, ret = 0; |
eae854b2 BR |
146 | |
147 | rtc = dev_get_drvdata(dev); | |
148 | ||
149 | dev_dbg(dev, "RTC_TIME: %u.%u.%u %u:%u:%u\n", | |
150 | tm->tm_mday, tm->tm_mon, tm->tm_year, | |
151 | tm->tm_hour, tm->tm_min, tm->tm_sec); | |
152 | ||
153 | rtc2pcf_time(&pcf_tm, tm); | |
154 | ||
155 | dev_dbg(dev, "PCF_TIME: %02x.%02x.%02x %02x:%02x:%02x\n", | |
156 | pcf_tm.time[PCF50633_TI_DAY], | |
157 | pcf_tm.time[PCF50633_TI_MONTH], | |
158 | pcf_tm.time[PCF50633_TI_YEAR], | |
159 | pcf_tm.time[PCF50633_TI_HOUR], | |
160 | pcf_tm.time[PCF50633_TI_MIN], | |
161 | pcf_tm.time[PCF50633_TI_SEC]); | |
162 | ||
163 | ||
eae854b2 BR |
164 | alarm_masked = pcf50633_irq_mask_get(rtc->pcf, PCF50633_IRQ_ALARM); |
165 | ||
eae854b2 BR |
166 | if (!alarm_masked) |
167 | pcf50633_irq_mask(rtc->pcf, PCF50633_IRQ_ALARM); | |
168 | ||
169 | /* Returns 0 on success */ | |
170 | ret = pcf50633_write_block(rtc->pcf, PCF50633_REG_RTCSC, | |
171 | PCF50633_TI_EXTENT, | |
172 | &pcf_tm.time[0]); | |
173 | ||
eae854b2 BR |
174 | if (!alarm_masked) |
175 | pcf50633_irq_unmask(rtc->pcf, PCF50633_IRQ_ALARM); | |
176 | ||
177 | return ret; | |
178 | } | |
179 | ||
180 | static int pcf50633_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
181 | { | |
182 | struct pcf50633_rtc *rtc; | |
183 | struct pcf50633_time pcf_tm; | |
184 | int ret = 0; | |
185 | ||
186 | rtc = dev_get_drvdata(dev); | |
187 | ||
188 | alrm->enabled = rtc->alarm_enabled; | |
a766ae3e | 189 | alrm->pending = rtc->alarm_pending; |
eae854b2 BR |
190 | |
191 | ret = pcf50633_read_block(rtc->pcf, PCF50633_REG_RTCSCA, | |
192 | PCF50633_TI_EXTENT, &pcf_tm.time[0]); | |
193 | if (ret != PCF50633_TI_EXTENT) { | |
194 | dev_err(dev, "Failed to read time\n"); | |
195 | return -EIO; | |
196 | } | |
197 | ||
198 | pcf2rtc_time(&alrm->time, &pcf_tm); | |
199 | ||
200 | return rtc_valid_tm(&alrm->time); | |
201 | } | |
202 | ||
203 | static int pcf50633_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
204 | { | |
205 | struct pcf50633_rtc *rtc; | |
206 | struct pcf50633_time pcf_tm; | |
207 | int alarm_masked, ret = 0; | |
208 | ||
209 | rtc = dev_get_drvdata(dev); | |
210 | ||
211 | rtc2pcf_time(&pcf_tm, &alrm->time); | |
212 | ||
213 | /* do like mktime does and ignore tm_wday */ | |
214 | pcf_tm.time[PCF50633_TI_WKDAY] = 7; | |
215 | ||
216 | alarm_masked = pcf50633_irq_mask_get(rtc->pcf, PCF50633_IRQ_ALARM); | |
217 | ||
218 | /* disable alarm interrupt */ | |
219 | if (!alarm_masked) | |
220 | pcf50633_irq_mask(rtc->pcf, PCF50633_IRQ_ALARM); | |
221 | ||
222 | /* Returns 0 on success */ | |
223 | ret = pcf50633_write_block(rtc->pcf, PCF50633_REG_RTCSCA, | |
224 | PCF50633_TI_EXTENT, &pcf_tm.time[0]); | |
a766ae3e WA |
225 | if (!alrm->enabled) |
226 | rtc->alarm_pending = 0; | |
eae854b2 | 227 | |
05f45d7d | 228 | if (!alarm_masked || alrm->enabled) |
eae854b2 | 229 | pcf50633_irq_unmask(rtc->pcf, PCF50633_IRQ_ALARM); |
05f45d7d | 230 | rtc->alarm_enabled = alrm->enabled; |
eae854b2 BR |
231 | |
232 | return ret; | |
233 | } | |
234 | ||
235 | static struct rtc_class_ops pcf50633_rtc_ops = { | |
236 | .read_time = pcf50633_rtc_read_time, | |
237 | .set_time = pcf50633_rtc_set_time, | |
238 | .read_alarm = pcf50633_rtc_read_alarm, | |
239 | .set_alarm = pcf50633_rtc_set_alarm, | |
51ba60c5 | 240 | .alarm_irq_enable = pcf50633_rtc_alarm_irq_enable, |
eae854b2 BR |
241 | }; |
242 | ||
243 | static void pcf50633_rtc_irq(int irq, void *data) | |
244 | { | |
245 | struct pcf50633_rtc *rtc = data; | |
246 | ||
3d62b8f5 LPC |
247 | rtc_update_irq(rtc->rtc_dev, 1, RTC_AF | RTC_IRQF); |
248 | rtc->alarm_pending = 1; | |
eae854b2 BR |
249 | } |
250 | ||
5a167f45 | 251 | static int pcf50633_rtc_probe(struct platform_device *pdev) |
eae854b2 | 252 | { |
eae854b2 BR |
253 | struct pcf50633_rtc *rtc; |
254 | ||
76753caf | 255 | rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL); |
eae854b2 BR |
256 | if (!rtc) |
257 | return -ENOMEM; | |
258 | ||
68d641ef | 259 | rtc->pcf = dev_to_pcf50633(pdev->dev.parent); |
eae854b2 | 260 | platform_set_drvdata(pdev, rtc); |
76753caf | 261 | rtc->rtc_dev = devm_rtc_device_register(&pdev->dev, "pcf50633-rtc", |
eae854b2 BR |
262 | &pcf50633_rtc_ops, THIS_MODULE); |
263 | ||
76753caf JH |
264 | if (IS_ERR(rtc->rtc_dev)) |
265 | return PTR_ERR(rtc->rtc_dev); | |
eae854b2 BR |
266 | |
267 | pcf50633_register_irq(rtc->pcf, PCF50633_IRQ_ALARM, | |
268 | pcf50633_rtc_irq, rtc); | |
eae854b2 BR |
269 | return 0; |
270 | } | |
271 | ||
5a167f45 | 272 | static int pcf50633_rtc_remove(struct platform_device *pdev) |
eae854b2 BR |
273 | { |
274 | struct pcf50633_rtc *rtc; | |
275 | ||
276 | rtc = platform_get_drvdata(pdev); | |
eae854b2 | 277 | pcf50633_free_irq(rtc->pcf, PCF50633_IRQ_ALARM); |
eae854b2 | 278 | |
eae854b2 BR |
279 | return 0; |
280 | } | |
281 | ||
282 | static struct platform_driver pcf50633_rtc_driver = { | |
283 | .driver = { | |
284 | .name = "pcf50633-rtc", | |
285 | }, | |
286 | .probe = pcf50633_rtc_probe, | |
5a167f45 | 287 | .remove = pcf50633_rtc_remove, |
eae854b2 BR |
288 | }; |
289 | ||
0c4eae66 | 290 | module_platform_driver(pcf50633_rtc_driver); |
eae854b2 BR |
291 | |
292 | MODULE_DESCRIPTION("PCF50633 RTC driver"); | |
293 | MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>"); | |
294 | MODULE_LICENSE("GPL"); | |
295 |