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