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"); 344 345