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Linux/drivers/rtc/rtc-pcf50633.c

  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/slab.h>
 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 alarm_pending;
 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]);
 74         rtc->tm_mon = bcd2bin(pcf->time[PCF50633_TI_MONTH]) - 1;
 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);
 85         pcf->time[PCF50633_TI_MONTH] = bin2bcd(rtc->tm_mon + 1);
 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 
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;
145         int alarm_masked, ret = 0;
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 
164         alarm_masked = pcf50633_irq_mask_get(rtc->pcf, PCF50633_IRQ_ALARM);
165 
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 
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;
189         alrm->pending = rtc->alarm_pending;
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]);
225         if (!alrm->enabled)
226                 rtc->alarm_pending = 0;
227 
228         if (!alarm_masked || alrm->enabled)
229                 pcf50633_irq_unmask(rtc->pcf, PCF50633_IRQ_ALARM);
230         rtc->alarm_enabled = alrm->enabled;
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,
240         .alarm_irq_enable       = pcf50633_rtc_alarm_irq_enable,
241 };
242 
243 static void pcf50633_rtc_irq(int irq, void *data)
244 {
245         struct pcf50633_rtc *rtc = data;
246 
247         rtc_update_irq(rtc->rtc_dev, 1, RTC_AF | RTC_IRQF);
248         rtc->alarm_pending = 1;
249 }
250 
251 static int pcf50633_rtc_probe(struct platform_device *pdev)
252 {
253         struct pcf50633_rtc *rtc;
254 
255         rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL);
256         if (!rtc)
257                 return -ENOMEM;
258 
259         rtc->pcf = dev_to_pcf50633(pdev->dev.parent);
260         platform_set_drvdata(pdev, rtc);
261         rtc->rtc_dev = devm_rtc_device_register(&pdev->dev, "pcf50633-rtc",
262                                 &pcf50633_rtc_ops, THIS_MODULE);
263 
264         if (IS_ERR(rtc->rtc_dev))
265                 return PTR_ERR(rtc->rtc_dev);
266 
267         pcf50633_register_irq(rtc->pcf, PCF50633_IRQ_ALARM,
268                                         pcf50633_rtc_irq, rtc);
269         return 0;
270 }
271 
272 static int pcf50633_rtc_remove(struct platform_device *pdev)
273 {
274         struct pcf50633_rtc *rtc;
275 
276         rtc = platform_get_drvdata(pdev);
277         pcf50633_free_irq(rtc->pcf, PCF50633_IRQ_ALARM);
278 
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,
287         .remove = pcf50633_rtc_remove,
288 };
289 
290 module_platform_driver(pcf50633_rtc_driver);
291 
292 MODULE_DESCRIPTION("PCF50633 RTC driver");
293 MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>");
294 MODULE_LICENSE("GPL");
295 
296 

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