1 /* 2 * Real time clock driver for DA9052 3 * 4 * Copyright(c) 2012 Dialog Semiconductor Ltd. 5 * 6 * Author: Dajun Dajun Chen <dajun.chen@diasemi.com> 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 * 13 */ 14 15 #include <linux/module.h> 16 #include <linux/platform_device.h> 17 #include <linux/rtc.h> 18 #include <linux/err.h> 19 20 #include <linux/mfd/da9052/da9052.h> 21 #include <linux/mfd/da9052/reg.h> 22 23 #define rtc_err(rtc, fmt, ...) \ 24 dev_err(rtc->da9052->dev, "%s: " fmt, __func__, ##__VA_ARGS__) 25 26 struct da9052_rtc { 27 struct rtc_device *rtc; 28 struct da9052 *da9052; 29 }; 30 31 static int da9052_rtc_enable_alarm(struct da9052_rtc *rtc, bool enable) 32 { 33 int ret; 34 if (enable) { 35 ret = da9052_reg_update(rtc->da9052, DA9052_ALARM_Y_REG, 36 DA9052_ALARM_Y_ALARM_ON|DA9052_ALARM_Y_TICK_ON, 37 DA9052_ALARM_Y_ALARM_ON); 38 if (ret != 0) 39 rtc_err(rtc, "Failed to enable ALM: %d\n", ret); 40 } else { 41 ret = da9052_reg_update(rtc->da9052, DA9052_ALARM_Y_REG, 42 DA9052_ALARM_Y_ALARM_ON|DA9052_ALARM_Y_TICK_ON, 0); 43 if (ret != 0) 44 rtc_err(rtc, "Write error: %d\n", ret); 45 } 46 return ret; 47 } 48 49 static irqreturn_t da9052_rtc_irq(int irq, void *data) 50 { 51 struct da9052_rtc *rtc = data; 52 53 rtc_update_irq(rtc->rtc, 1, RTC_IRQF | RTC_AF); 54 55 return IRQ_HANDLED; 56 } 57 58 static int da9052_read_alarm(struct da9052_rtc *rtc, struct rtc_time *rtc_tm) 59 { 60 int ret; 61 uint8_t v[5]; 62 63 ret = da9052_group_read(rtc->da9052, DA9052_ALARM_MI_REG, 5, v); 64 if (ret != 0) { 65 rtc_err(rtc, "Failed to group read ALM: %d\n", ret); 66 return ret; 67 } 68 69 rtc_tm->tm_year = (v[4] & DA9052_RTC_YEAR) + 100; 70 rtc_tm->tm_mon = (v[3] & DA9052_RTC_MONTH) - 1; 71 rtc_tm->tm_mday = v[2] & DA9052_RTC_DAY; 72 rtc_tm->tm_hour = v[1] & DA9052_RTC_HOUR; 73 rtc_tm->tm_min = v[0] & DA9052_RTC_MIN; 74 75 ret = rtc_valid_tm(rtc_tm); 76 return ret; 77 } 78 79 static int da9052_set_alarm(struct da9052_rtc *rtc, struct rtc_time *rtc_tm) 80 { 81 struct da9052 *da9052 = rtc->da9052; 82 unsigned long alm_time; 83 int ret; 84 uint8_t v[3]; 85 86 ret = rtc_tm_to_time(rtc_tm, &alm_time); 87 if (ret != 0) 88 return ret; 89 90 if (rtc_tm->tm_sec > 0) { 91 alm_time += 60 - rtc_tm->tm_sec; 92 rtc_time_to_tm(alm_time, rtc_tm); 93 } 94 BUG_ON(rtc_tm->tm_sec); /* it will cause repeated irqs if not zero */ 95 96 rtc_tm->tm_year -= 100; 97 rtc_tm->tm_mon += 1; 98 99 ret = da9052_reg_update(da9052, DA9052_ALARM_MI_REG, 100 DA9052_RTC_MIN, rtc_tm->tm_min); 101 if (ret != 0) { 102 rtc_err(rtc, "Failed to write ALRM MIN: %d\n", ret); 103 return ret; 104 } 105 106 v[0] = rtc_tm->tm_hour; 107 v[1] = rtc_tm->tm_mday; 108 v[2] = rtc_tm->tm_mon; 109 110 ret = da9052_group_write(da9052, DA9052_ALARM_H_REG, 3, v); 111 if (ret < 0) 112 return ret; 113 114 ret = da9052_reg_update(da9052, DA9052_ALARM_Y_REG, 115 DA9052_RTC_YEAR, rtc_tm->tm_year); 116 if (ret != 0) 117 rtc_err(rtc, "Failed to write ALRM YEAR: %d\n", ret); 118 119 return ret; 120 } 121 122 static int da9052_rtc_get_alarm_status(struct da9052_rtc *rtc) 123 { 124 int ret; 125 126 ret = da9052_reg_read(rtc->da9052, DA9052_ALARM_Y_REG); 127 if (ret < 0) { 128 rtc_err(rtc, "Failed to read ALM: %d\n", ret); 129 return ret; 130 } 131 132 return !!(ret&DA9052_ALARM_Y_ALARM_ON); 133 } 134 135 static int da9052_rtc_read_time(struct device *dev, struct rtc_time *rtc_tm) 136 { 137 struct da9052_rtc *rtc = dev_get_drvdata(dev); 138 uint8_t v[6]; 139 int ret; 140 141 ret = da9052_group_read(rtc->da9052, DA9052_COUNT_S_REG, 6, v); 142 if (ret < 0) { 143 rtc_err(rtc, "Failed to read RTC time : %d\n", ret); 144 return ret; 145 } 146 147 rtc_tm->tm_year = (v[5] & DA9052_RTC_YEAR) + 100; 148 rtc_tm->tm_mon = (v[4] & DA9052_RTC_MONTH) - 1; 149 rtc_tm->tm_mday = v[3] & DA9052_RTC_DAY; 150 rtc_tm->tm_hour = v[2] & DA9052_RTC_HOUR; 151 rtc_tm->tm_min = v[1] & DA9052_RTC_MIN; 152 rtc_tm->tm_sec = v[0] & DA9052_RTC_SEC; 153 154 ret = rtc_valid_tm(rtc_tm); 155 return ret; 156 } 157 158 static int da9052_rtc_set_time(struct device *dev, struct rtc_time *tm) 159 { 160 struct da9052_rtc *rtc; 161 uint8_t v[6]; 162 int ret; 163 164 rtc = dev_get_drvdata(dev); 165 166 v[0] = tm->tm_sec; 167 v[1] = tm->tm_min; 168 v[2] = tm->tm_hour; 169 v[3] = tm->tm_mday; 170 v[4] = tm->tm_mon + 1; 171 v[5] = tm->tm_year - 100; 172 173 ret = da9052_group_write(rtc->da9052, DA9052_COUNT_S_REG, 6, v); 174 if (ret < 0) 175 rtc_err(rtc, "failed to set RTC time: %d\n", ret); 176 return ret; 177 } 178 179 static int da9052_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) 180 { 181 int ret; 182 struct rtc_time *tm = &alrm->time; 183 struct da9052_rtc *rtc = dev_get_drvdata(dev); 184 185 ret = da9052_read_alarm(rtc, tm); 186 if (ret < 0) { 187 rtc_err(rtc, "failed to read RTC alarm: %d\n", ret); 188 return ret; 189 } 190 191 alrm->enabled = da9052_rtc_get_alarm_status(rtc); 192 return 0; 193 } 194 195 static int da9052_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) 196 { 197 int ret; 198 struct rtc_time *tm = &alrm->time; 199 struct da9052_rtc *rtc = dev_get_drvdata(dev); 200 201 ret = da9052_rtc_enable_alarm(rtc, 0); 202 if (ret < 0) 203 return ret; 204 205 ret = da9052_set_alarm(rtc, tm); 206 if (ret < 0) 207 return ret; 208 209 ret = da9052_rtc_enable_alarm(rtc, 1); 210 return ret; 211 } 212 213 static int da9052_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled) 214 { 215 struct da9052_rtc *rtc = dev_get_drvdata(dev); 216 217 return da9052_rtc_enable_alarm(rtc, enabled); 218 } 219 220 static const struct rtc_class_ops da9052_rtc_ops = { 221 .read_time = da9052_rtc_read_time, 222 .set_time = da9052_rtc_set_time, 223 .read_alarm = da9052_rtc_read_alarm, 224 .set_alarm = da9052_rtc_set_alarm, 225 .alarm_irq_enable = da9052_rtc_alarm_irq_enable, 226 }; 227 228 static int da9052_rtc_probe(struct platform_device *pdev) 229 { 230 struct da9052_rtc *rtc; 231 int ret; 232 233 rtc = devm_kzalloc(&pdev->dev, sizeof(struct da9052_rtc), GFP_KERNEL); 234 if (!rtc) 235 return -ENOMEM; 236 237 rtc->da9052 = dev_get_drvdata(pdev->dev.parent); 238 platform_set_drvdata(pdev, rtc); 239 240 ret = da9052_reg_write(rtc->da9052, DA9052_BBAT_CONT_REG, 0xFE); 241 if (ret < 0) { 242 rtc_err(rtc, 243 "Failed to setup RTC battery charging: %d\n", ret); 244 return ret; 245 } 246 247 ret = da9052_reg_update(rtc->da9052, DA9052_ALARM_Y_REG, 248 DA9052_ALARM_Y_TICK_ON, 0); 249 if (ret != 0) 250 rtc_err(rtc, "Failed to disable TICKS: %d\n", ret); 251 252 ret = da9052_request_irq(rtc->da9052, DA9052_IRQ_ALARM, "ALM", 253 da9052_rtc_irq, rtc); 254 if (ret != 0) { 255 rtc_err(rtc, "irq registration failed: %d\n", ret); 256 return ret; 257 } 258 259 rtc->rtc = devm_rtc_device_register(&pdev->dev, pdev->name, 260 &da9052_rtc_ops, THIS_MODULE); 261 return PTR_ERR_OR_ZERO(rtc->rtc); 262 } 263 264 static struct platform_driver da9052_rtc_driver = { 265 .probe = da9052_rtc_probe, 266 .driver = { 267 .name = "da9052-rtc", 268 .owner = THIS_MODULE, 269 }, 270 }; 271 272 module_platform_driver(da9052_rtc_driver); 273 274 MODULE_AUTHOR("Anthony Olech <Anthony.Olech@diasemi.com>"); 275 MODULE_DESCRIPTION("RTC driver for Dialog DA9052 PMIC"); 276 MODULE_LICENSE("GPL"); 277 MODULE_ALIAS("platform:da9052-rtc"); 278