11e3929efSAlexandre Belloni /* 21e3929efSAlexandre Belloni * RTC driver for the Micro Crystal RV8803 31e3929efSAlexandre Belloni * 41e3929efSAlexandre Belloni * Copyright (C) 2015 Micro Crystal SA 51e3929efSAlexandre Belloni * 61e3929efSAlexandre Belloni * Alexandre Belloni <alexandre.belloni@free-electrons.com> 71e3929efSAlexandre Belloni * 81e3929efSAlexandre Belloni * This program is free software; you can redistribute it and/or modify 91e3929efSAlexandre Belloni * it under the terms of the GNU General Public License version 2 as 101e3929efSAlexandre Belloni * published by the Free Software Foundation. 111e3929efSAlexandre Belloni * 121e3929efSAlexandre Belloni */ 131e3929efSAlexandre Belloni 141e3929efSAlexandre Belloni #include <linux/bcd.h> 151e3929efSAlexandre Belloni #include <linux/bitops.h> 161e3929efSAlexandre Belloni #include <linux/i2c.h> 171e3929efSAlexandre Belloni #include <linux/interrupt.h> 181e3929efSAlexandre Belloni #include <linux/kernel.h> 191e3929efSAlexandre Belloni #include <linux/module.h> 201e3929efSAlexandre Belloni #include <linux/rtc.h> 211e3929efSAlexandre Belloni 221e3929efSAlexandre Belloni #define RV8803_SEC 0x00 231e3929efSAlexandre Belloni #define RV8803_MIN 0x01 241e3929efSAlexandre Belloni #define RV8803_HOUR 0x02 251e3929efSAlexandre Belloni #define RV8803_WEEK 0x03 261e3929efSAlexandre Belloni #define RV8803_DAY 0x04 271e3929efSAlexandre Belloni #define RV8803_MONTH 0x05 281e3929efSAlexandre Belloni #define RV8803_YEAR 0x06 291e3929efSAlexandre Belloni #define RV8803_RAM 0x07 301e3929efSAlexandre Belloni #define RV8803_ALARM_MIN 0x08 311e3929efSAlexandre Belloni #define RV8803_ALARM_HOUR 0x09 321e3929efSAlexandre Belloni #define RV8803_ALARM_WEEK_OR_DAY 0x0A 331e3929efSAlexandre Belloni #define RV8803_EXT 0x0D 341e3929efSAlexandre Belloni #define RV8803_FLAG 0x0E 351e3929efSAlexandre Belloni #define RV8803_CTRL 0x0F 361e3929efSAlexandre Belloni 371e3929efSAlexandre Belloni #define RV8803_EXT_WADA BIT(6) 381e3929efSAlexandre Belloni 391e3929efSAlexandre Belloni #define RV8803_FLAG_V1F BIT(0) 401e3929efSAlexandre Belloni #define RV8803_FLAG_V2F BIT(1) 411e3929efSAlexandre Belloni #define RV8803_FLAG_AF BIT(3) 421e3929efSAlexandre Belloni #define RV8803_FLAG_TF BIT(4) 431e3929efSAlexandre Belloni #define RV8803_FLAG_UF BIT(5) 441e3929efSAlexandre Belloni 451e3929efSAlexandre Belloni #define RV8803_CTRL_RESET BIT(0) 461e3929efSAlexandre Belloni 471e3929efSAlexandre Belloni #define RV8803_CTRL_EIE BIT(2) 481e3929efSAlexandre Belloni #define RV8803_CTRL_AIE BIT(3) 491e3929efSAlexandre Belloni #define RV8803_CTRL_TIE BIT(4) 501e3929efSAlexandre Belloni #define RV8803_CTRL_UIE BIT(5) 511e3929efSAlexandre Belloni 521e3929efSAlexandre Belloni struct rv8803_data { 531e3929efSAlexandre Belloni struct i2c_client *client; 541e3929efSAlexandre Belloni struct rtc_device *rtc; 55*9d1fa4c3SOleksij Rempel struct mutex flags_lock; 561e3929efSAlexandre Belloni u8 ctrl; 571e3929efSAlexandre Belloni }; 581e3929efSAlexandre Belloni 591e3929efSAlexandre Belloni static irqreturn_t rv8803_handle_irq(int irq, void *dev_id) 601e3929efSAlexandre Belloni { 611e3929efSAlexandre Belloni struct i2c_client *client = dev_id; 621e3929efSAlexandre Belloni struct rv8803_data *rv8803 = i2c_get_clientdata(client); 631e3929efSAlexandre Belloni unsigned long events = 0; 6468c85f29SAndrzej Hajda int flags; 651e3929efSAlexandre Belloni 66*9d1fa4c3SOleksij Rempel mutex_lock(&rv8803->flags_lock); 671e3929efSAlexandre Belloni 681e3929efSAlexandre Belloni flags = i2c_smbus_read_byte_data(client, RV8803_FLAG); 691e3929efSAlexandre Belloni if (flags <= 0) { 70*9d1fa4c3SOleksij Rempel mutex_unlock(&rv8803->flags_lock); 711e3929efSAlexandre Belloni return IRQ_NONE; 721e3929efSAlexandre Belloni } 731e3929efSAlexandre Belloni 741e3929efSAlexandre Belloni if (flags & RV8803_FLAG_V1F) 751e3929efSAlexandre Belloni dev_warn(&client->dev, "Voltage low, temperature compensation stopped.\n"); 761e3929efSAlexandre Belloni 771e3929efSAlexandre Belloni if (flags & RV8803_FLAG_V2F) 781e3929efSAlexandre Belloni dev_warn(&client->dev, "Voltage low, data loss detected.\n"); 791e3929efSAlexandre Belloni 801e3929efSAlexandre Belloni if (flags & RV8803_FLAG_TF) { 811e3929efSAlexandre Belloni flags &= ~RV8803_FLAG_TF; 821e3929efSAlexandre Belloni rv8803->ctrl &= ~RV8803_CTRL_TIE; 831e3929efSAlexandre Belloni events |= RTC_PF; 841e3929efSAlexandre Belloni } 851e3929efSAlexandre Belloni 861e3929efSAlexandre Belloni if (flags & RV8803_FLAG_AF) { 871e3929efSAlexandre Belloni flags &= ~RV8803_FLAG_AF; 881e3929efSAlexandre Belloni rv8803->ctrl &= ~RV8803_CTRL_AIE; 891e3929efSAlexandre Belloni events |= RTC_AF; 901e3929efSAlexandre Belloni } 911e3929efSAlexandre Belloni 921e3929efSAlexandre Belloni if (flags & RV8803_FLAG_UF) { 931e3929efSAlexandre Belloni flags &= ~RV8803_FLAG_UF; 941e3929efSAlexandre Belloni rv8803->ctrl &= ~RV8803_CTRL_UIE; 951e3929efSAlexandre Belloni events |= RTC_UF; 961e3929efSAlexandre Belloni } 971e3929efSAlexandre Belloni 981e3929efSAlexandre Belloni if (events) { 991e3929efSAlexandre Belloni rtc_update_irq(rv8803->rtc, 1, events); 1001e3929efSAlexandre Belloni i2c_smbus_write_byte_data(client, RV8803_FLAG, flags); 1011e3929efSAlexandre Belloni i2c_smbus_write_byte_data(rv8803->client, RV8803_CTRL, 1021e3929efSAlexandre Belloni rv8803->ctrl); 1031e3929efSAlexandre Belloni } 1041e3929efSAlexandre Belloni 105*9d1fa4c3SOleksij Rempel mutex_unlock(&rv8803->flags_lock); 1061e3929efSAlexandre Belloni 1071e3929efSAlexandre Belloni return IRQ_HANDLED; 1081e3929efSAlexandre Belloni } 1091e3929efSAlexandre Belloni 1101e3929efSAlexandre Belloni static int rv8803_get_time(struct device *dev, struct rtc_time *tm) 1111e3929efSAlexandre Belloni { 1121e3929efSAlexandre Belloni struct rv8803_data *rv8803 = dev_get_drvdata(dev); 1131e3929efSAlexandre Belloni u8 date1[7]; 1141e3929efSAlexandre Belloni u8 date2[7]; 1151e3929efSAlexandre Belloni u8 *date = date1; 1161e3929efSAlexandre Belloni int ret, flags; 1171e3929efSAlexandre Belloni 1181e3929efSAlexandre Belloni flags = i2c_smbus_read_byte_data(rv8803->client, RV8803_FLAG); 1191e3929efSAlexandre Belloni if (flags < 0) 1201e3929efSAlexandre Belloni return flags; 1211e3929efSAlexandre Belloni 1221e3929efSAlexandre Belloni if (flags & RV8803_FLAG_V2F) { 1231e3929efSAlexandre Belloni dev_warn(dev, "Voltage low, data is invalid.\n"); 1241e3929efSAlexandre Belloni return -EINVAL; 1251e3929efSAlexandre Belloni } 1261e3929efSAlexandre Belloni 1271e3929efSAlexandre Belloni ret = i2c_smbus_read_i2c_block_data(rv8803->client, RV8803_SEC, 1281e3929efSAlexandre Belloni 7, date); 1291e3929efSAlexandre Belloni if (ret != 7) 1301e3929efSAlexandre Belloni return ret < 0 ? ret : -EIO; 1311e3929efSAlexandre Belloni 1321e3929efSAlexandre Belloni if ((date1[RV8803_SEC] & 0x7f) == bin2bcd(59)) { 1331e3929efSAlexandre Belloni ret = i2c_smbus_read_i2c_block_data(rv8803->client, RV8803_SEC, 1341e3929efSAlexandre Belloni 7, date2); 1351e3929efSAlexandre Belloni if (ret != 7) 1361e3929efSAlexandre Belloni return ret < 0 ? ret : -EIO; 1371e3929efSAlexandre Belloni 1381e3929efSAlexandre Belloni if ((date2[RV8803_SEC] & 0x7f) != bin2bcd(59)) 1391e3929efSAlexandre Belloni date = date2; 1401e3929efSAlexandre Belloni } 1411e3929efSAlexandre Belloni 1421e3929efSAlexandre Belloni tm->tm_sec = bcd2bin(date[RV8803_SEC] & 0x7f); 1431e3929efSAlexandre Belloni tm->tm_min = bcd2bin(date[RV8803_MIN] & 0x7f); 1441e3929efSAlexandre Belloni tm->tm_hour = bcd2bin(date[RV8803_HOUR] & 0x3f); 1451e3929efSAlexandre Belloni tm->tm_wday = ffs(date[RV8803_WEEK] & 0x7f); 1461e3929efSAlexandre Belloni tm->tm_mday = bcd2bin(date[RV8803_DAY] & 0x3f); 1471e3929efSAlexandre Belloni tm->tm_mon = bcd2bin(date[RV8803_MONTH] & 0x1f) - 1; 1481e3929efSAlexandre Belloni tm->tm_year = bcd2bin(date[RV8803_YEAR]) + 100; 1491e3929efSAlexandre Belloni 1501e3929efSAlexandre Belloni return rtc_valid_tm(tm); 1511e3929efSAlexandre Belloni } 1521e3929efSAlexandre Belloni 1531e3929efSAlexandre Belloni static int rv8803_set_time(struct device *dev, struct rtc_time *tm) 1541e3929efSAlexandre Belloni { 1551e3929efSAlexandre Belloni struct rv8803_data *rv8803 = dev_get_drvdata(dev); 1561e3929efSAlexandre Belloni u8 date[7]; 1571e3929efSAlexandre Belloni int flags, ret; 1581e3929efSAlexandre Belloni 1591e3929efSAlexandre Belloni if ((tm->tm_year < 100) || (tm->tm_year > 199)) 1601e3929efSAlexandre Belloni return -EINVAL; 1611e3929efSAlexandre Belloni 1621e3929efSAlexandre Belloni date[RV8803_SEC] = bin2bcd(tm->tm_sec); 1631e3929efSAlexandre Belloni date[RV8803_MIN] = bin2bcd(tm->tm_min); 1641e3929efSAlexandre Belloni date[RV8803_HOUR] = bin2bcd(tm->tm_hour); 1651e3929efSAlexandre Belloni date[RV8803_WEEK] = 1 << (tm->tm_wday); 1661e3929efSAlexandre Belloni date[RV8803_DAY] = bin2bcd(tm->tm_mday); 1671e3929efSAlexandre Belloni date[RV8803_MONTH] = bin2bcd(tm->tm_mon + 1); 1681e3929efSAlexandre Belloni date[RV8803_YEAR] = bin2bcd(tm->tm_year - 100); 1691e3929efSAlexandre Belloni 1701e3929efSAlexandre Belloni ret = i2c_smbus_write_i2c_block_data(rv8803->client, RV8803_SEC, 1711e3929efSAlexandre Belloni 7, date); 1721e3929efSAlexandre Belloni if (ret < 0) 1731e3929efSAlexandre Belloni return ret; 1741e3929efSAlexandre Belloni 175*9d1fa4c3SOleksij Rempel mutex_lock(&rv8803->flags_lock); 1761e3929efSAlexandre Belloni 1771e3929efSAlexandre Belloni flags = i2c_smbus_read_byte_data(rv8803->client, RV8803_FLAG); 1781e3929efSAlexandre Belloni if (flags < 0) { 179*9d1fa4c3SOleksij Rempel mutex_unlock(&rv8803->flags_lock); 1801e3929efSAlexandre Belloni return flags; 1811e3929efSAlexandre Belloni } 1821e3929efSAlexandre Belloni 1831e3929efSAlexandre Belloni ret = i2c_smbus_write_byte_data(rv8803->client, RV8803_FLAG, 1841e3929efSAlexandre Belloni flags & ~RV8803_FLAG_V2F); 1851e3929efSAlexandre Belloni 186*9d1fa4c3SOleksij Rempel mutex_unlock(&rv8803->flags_lock); 1871e3929efSAlexandre Belloni 1881e3929efSAlexandre Belloni return ret; 1891e3929efSAlexandre Belloni } 1901e3929efSAlexandre Belloni 1911e3929efSAlexandre Belloni static int rv8803_get_alarm(struct device *dev, struct rtc_wkalrm *alrm) 1921e3929efSAlexandre Belloni { 1931e3929efSAlexandre Belloni struct rv8803_data *rv8803 = dev_get_drvdata(dev); 1941e3929efSAlexandre Belloni struct i2c_client *client = rv8803->client; 1951e3929efSAlexandre Belloni u8 alarmvals[3]; 1961e3929efSAlexandre Belloni int flags, ret; 1971e3929efSAlexandre Belloni 1981e3929efSAlexandre Belloni ret = i2c_smbus_read_i2c_block_data(client, RV8803_ALARM_MIN, 1991e3929efSAlexandre Belloni 3, alarmvals); 2001e3929efSAlexandre Belloni if (ret != 3) 2011e3929efSAlexandre Belloni return ret < 0 ? ret : -EIO; 2021e3929efSAlexandre Belloni 2031e3929efSAlexandre Belloni flags = i2c_smbus_read_byte_data(client, RV8803_FLAG); 2041e3929efSAlexandre Belloni if (flags < 0) 2051e3929efSAlexandre Belloni return flags; 2061e3929efSAlexandre Belloni 2071e3929efSAlexandre Belloni alrm->time.tm_sec = 0; 2081e3929efSAlexandre Belloni alrm->time.tm_min = bcd2bin(alarmvals[0] & 0x7f); 2091e3929efSAlexandre Belloni alrm->time.tm_hour = bcd2bin(alarmvals[1] & 0x3f); 2101e3929efSAlexandre Belloni alrm->time.tm_wday = -1; 2111e3929efSAlexandre Belloni alrm->time.tm_mday = bcd2bin(alarmvals[2] & 0x3f); 2121e3929efSAlexandre Belloni alrm->time.tm_mon = -1; 2131e3929efSAlexandre Belloni alrm->time.tm_year = -1; 2141e3929efSAlexandre Belloni 2151e3929efSAlexandre Belloni alrm->enabled = !!(rv8803->ctrl & RV8803_CTRL_AIE); 2161e3929efSAlexandre Belloni alrm->pending = (flags & RV8803_FLAG_AF) && alrm->enabled; 2171e3929efSAlexandre Belloni 2181e3929efSAlexandre Belloni return 0; 2191e3929efSAlexandre Belloni } 2201e3929efSAlexandre Belloni 2211e3929efSAlexandre Belloni static int rv8803_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) 2221e3929efSAlexandre Belloni { 2231e3929efSAlexandre Belloni struct i2c_client *client = to_i2c_client(dev); 2241e3929efSAlexandre Belloni struct rv8803_data *rv8803 = dev_get_drvdata(dev); 2251e3929efSAlexandre Belloni u8 alarmvals[3]; 2261e3929efSAlexandre Belloni u8 ctrl[2]; 2271e3929efSAlexandre Belloni int ret, err; 2281e3929efSAlexandre Belloni 2291e3929efSAlexandre Belloni /* The alarm has no seconds, round up to nearest minute */ 2301e3929efSAlexandre Belloni if (alrm->time.tm_sec) { 2311e3929efSAlexandre Belloni time64_t alarm_time = rtc_tm_to_time64(&alrm->time); 2321e3929efSAlexandre Belloni 2331e3929efSAlexandre Belloni alarm_time += 60 - alrm->time.tm_sec; 2341e3929efSAlexandre Belloni rtc_time64_to_tm(alarm_time, &alrm->time); 2351e3929efSAlexandre Belloni } 2361e3929efSAlexandre Belloni 237*9d1fa4c3SOleksij Rempel mutex_lock(&rv8803->flags_lock); 2381e3929efSAlexandre Belloni 2391e3929efSAlexandre Belloni ret = i2c_smbus_read_i2c_block_data(client, RV8803_FLAG, 2, ctrl); 2401e3929efSAlexandre Belloni if (ret != 2) { 241*9d1fa4c3SOleksij Rempel mutex_unlock(&rv8803->flags_lock); 2421e3929efSAlexandre Belloni return ret < 0 ? ret : -EIO; 2431e3929efSAlexandre Belloni } 2441e3929efSAlexandre Belloni 2451e3929efSAlexandre Belloni alarmvals[0] = bin2bcd(alrm->time.tm_min); 2461e3929efSAlexandre Belloni alarmvals[1] = bin2bcd(alrm->time.tm_hour); 2471e3929efSAlexandre Belloni alarmvals[2] = bin2bcd(alrm->time.tm_mday); 2481e3929efSAlexandre Belloni 2491e3929efSAlexandre Belloni if (rv8803->ctrl & (RV8803_CTRL_AIE | RV8803_CTRL_UIE)) { 2501e3929efSAlexandre Belloni rv8803->ctrl &= ~(RV8803_CTRL_AIE | RV8803_CTRL_UIE); 2511e3929efSAlexandre Belloni err = i2c_smbus_write_byte_data(rv8803->client, RV8803_CTRL, 2521e3929efSAlexandre Belloni rv8803->ctrl); 2531e3929efSAlexandre Belloni if (err) { 254*9d1fa4c3SOleksij Rempel mutex_unlock(&rv8803->flags_lock); 2551e3929efSAlexandre Belloni return err; 2561e3929efSAlexandre Belloni } 2571e3929efSAlexandre Belloni } 2581e3929efSAlexandre Belloni 2591e3929efSAlexandre Belloni ctrl[1] &= ~RV8803_FLAG_AF; 2601e3929efSAlexandre Belloni err = i2c_smbus_write_byte_data(rv8803->client, RV8803_FLAG, ctrl[1]); 261*9d1fa4c3SOleksij Rempel mutex_unlock(&rv8803->flags_lock); 2621e3929efSAlexandre Belloni if (err) 2631e3929efSAlexandre Belloni return err; 2641e3929efSAlexandre Belloni 2651e3929efSAlexandre Belloni err = i2c_smbus_write_i2c_block_data(rv8803->client, RV8803_ALARM_MIN, 2661e3929efSAlexandre Belloni 3, alarmvals); 2671e3929efSAlexandre Belloni if (err) 2681e3929efSAlexandre Belloni return err; 2691e3929efSAlexandre Belloni 2701e3929efSAlexandre Belloni if (alrm->enabled) { 2711e3929efSAlexandre Belloni if (rv8803->rtc->uie_rtctimer.enabled) 2721e3929efSAlexandre Belloni rv8803->ctrl |= RV8803_CTRL_UIE; 2731e3929efSAlexandre Belloni if (rv8803->rtc->aie_timer.enabled) 2741e3929efSAlexandre Belloni rv8803->ctrl |= RV8803_CTRL_AIE; 2751e3929efSAlexandre Belloni 2761e3929efSAlexandre Belloni err = i2c_smbus_write_byte_data(rv8803->client, RV8803_CTRL, 2771e3929efSAlexandre Belloni rv8803->ctrl); 2781e3929efSAlexandre Belloni if (err) 2791e3929efSAlexandre Belloni return err; 2801e3929efSAlexandre Belloni } 2811e3929efSAlexandre Belloni 2821e3929efSAlexandre Belloni return 0; 2831e3929efSAlexandre Belloni } 2841e3929efSAlexandre Belloni 2851e3929efSAlexandre Belloni static int rv8803_alarm_irq_enable(struct device *dev, unsigned int enabled) 2861e3929efSAlexandre Belloni { 2871e3929efSAlexandre Belloni struct i2c_client *client = to_i2c_client(dev); 2881e3929efSAlexandre Belloni struct rv8803_data *rv8803 = dev_get_drvdata(dev); 2891e3929efSAlexandre Belloni int ctrl, flags, err; 2901e3929efSAlexandre Belloni 2911e3929efSAlexandre Belloni ctrl = rv8803->ctrl; 2921e3929efSAlexandre Belloni 2931e3929efSAlexandre Belloni if (enabled) { 2941e3929efSAlexandre Belloni if (rv8803->rtc->uie_rtctimer.enabled) 2951e3929efSAlexandre Belloni ctrl |= RV8803_CTRL_UIE; 2961e3929efSAlexandre Belloni if (rv8803->rtc->aie_timer.enabled) 2971e3929efSAlexandre Belloni ctrl |= RV8803_CTRL_AIE; 2981e3929efSAlexandre Belloni } else { 2991e3929efSAlexandre Belloni if (!rv8803->rtc->uie_rtctimer.enabled) 3001e3929efSAlexandre Belloni ctrl &= ~RV8803_CTRL_UIE; 3011e3929efSAlexandre Belloni if (!rv8803->rtc->aie_timer.enabled) 3021e3929efSAlexandre Belloni ctrl &= ~RV8803_CTRL_AIE; 3031e3929efSAlexandre Belloni } 3041e3929efSAlexandre Belloni 305*9d1fa4c3SOleksij Rempel mutex_lock(&rv8803->flags_lock); 3061e3929efSAlexandre Belloni flags = i2c_smbus_read_byte_data(client, RV8803_FLAG); 3071e3929efSAlexandre Belloni if (flags < 0) { 308*9d1fa4c3SOleksij Rempel mutex_unlock(&rv8803->flags_lock); 3091e3929efSAlexandre Belloni return flags; 3101e3929efSAlexandre Belloni } 3111e3929efSAlexandre Belloni flags &= ~(RV8803_FLAG_AF | RV8803_FLAG_UF); 3121e3929efSAlexandre Belloni err = i2c_smbus_write_byte_data(client, RV8803_FLAG, flags); 313*9d1fa4c3SOleksij Rempel mutex_unlock(&rv8803->flags_lock); 3141e3929efSAlexandre Belloni if (err) 3151e3929efSAlexandre Belloni return err; 3161e3929efSAlexandre Belloni 3171e3929efSAlexandre Belloni if (ctrl != rv8803->ctrl) { 3181e3929efSAlexandre Belloni rv8803->ctrl = ctrl; 3191e3929efSAlexandre Belloni err = i2c_smbus_write_byte_data(client, RV8803_CTRL, 3201e3929efSAlexandre Belloni rv8803->ctrl); 3211e3929efSAlexandre Belloni if (err) 3221e3929efSAlexandre Belloni return err; 3231e3929efSAlexandre Belloni } 3241e3929efSAlexandre Belloni 3251e3929efSAlexandre Belloni return 0; 3261e3929efSAlexandre Belloni } 3271e3929efSAlexandre Belloni 3281e3929efSAlexandre Belloni static int rv8803_ioctl(struct device *dev, unsigned int cmd, unsigned long arg) 3291e3929efSAlexandre Belloni { 3301e3929efSAlexandre Belloni struct i2c_client *client = to_i2c_client(dev); 3311e3929efSAlexandre Belloni struct rv8803_data *rv8803 = dev_get_drvdata(dev); 3321e3929efSAlexandre Belloni int flags, ret = 0; 3331e3929efSAlexandre Belloni 3341e3929efSAlexandre Belloni switch (cmd) { 3351e3929efSAlexandre Belloni case RTC_VL_READ: 3361e3929efSAlexandre Belloni flags = i2c_smbus_read_byte_data(client, RV8803_FLAG); 3371e3929efSAlexandre Belloni if (flags < 0) 3381e3929efSAlexandre Belloni return flags; 3391e3929efSAlexandre Belloni 3401e3929efSAlexandre Belloni if (flags & RV8803_FLAG_V1F) 3411e3929efSAlexandre Belloni dev_warn(&client->dev, "Voltage low, temperature compensation stopped.\n"); 3421e3929efSAlexandre Belloni 3431e3929efSAlexandre Belloni if (flags & RV8803_FLAG_V2F) 3441e3929efSAlexandre Belloni dev_warn(&client->dev, "Voltage low, data loss detected.\n"); 3451e3929efSAlexandre Belloni 3461e3929efSAlexandre Belloni flags &= RV8803_FLAG_V1F | RV8803_FLAG_V2F; 3471e3929efSAlexandre Belloni 3481e3929efSAlexandre Belloni if (copy_to_user((void __user *)arg, &flags, sizeof(int))) 3491e3929efSAlexandre Belloni return -EFAULT; 3501e3929efSAlexandre Belloni 3511e3929efSAlexandre Belloni return 0; 3521e3929efSAlexandre Belloni 3531e3929efSAlexandre Belloni case RTC_VL_CLR: 354*9d1fa4c3SOleksij Rempel mutex_lock(&rv8803->flags_lock); 3551e3929efSAlexandre Belloni flags = i2c_smbus_read_byte_data(client, RV8803_FLAG); 3561e3929efSAlexandre Belloni if (flags < 0) { 357*9d1fa4c3SOleksij Rempel mutex_unlock(&rv8803->flags_lock); 3581e3929efSAlexandre Belloni return flags; 3591e3929efSAlexandre Belloni } 3601e3929efSAlexandre Belloni 3611e3929efSAlexandre Belloni flags &= ~(RV8803_FLAG_V1F | RV8803_FLAG_V2F); 3621e3929efSAlexandre Belloni ret = i2c_smbus_write_byte_data(client, RV8803_FLAG, flags); 363*9d1fa4c3SOleksij Rempel mutex_unlock(&rv8803->flags_lock); 3641e3929efSAlexandre Belloni if (ret < 0) 3651e3929efSAlexandre Belloni return ret; 3661e3929efSAlexandre Belloni 3671e3929efSAlexandre Belloni return 0; 3681e3929efSAlexandre Belloni 3691e3929efSAlexandre Belloni default: 3701e3929efSAlexandre Belloni return -ENOIOCTLCMD; 3711e3929efSAlexandre Belloni } 3721e3929efSAlexandre Belloni } 3731e3929efSAlexandre Belloni 3741e3929efSAlexandre Belloni static ssize_t rv8803_nvram_write(struct file *filp, struct kobject *kobj, 3751e3929efSAlexandre Belloni struct bin_attribute *attr, 3761e3929efSAlexandre Belloni char *buf, loff_t off, size_t count) 3771e3929efSAlexandre Belloni { 3781e3929efSAlexandre Belloni struct device *dev = kobj_to_dev(kobj); 3791e3929efSAlexandre Belloni struct i2c_client *client = to_i2c_client(dev); 3801e3929efSAlexandre Belloni int ret; 3811e3929efSAlexandre Belloni 3821e3929efSAlexandre Belloni ret = i2c_smbus_write_byte_data(client, RV8803_RAM, buf[0]); 3831e3929efSAlexandre Belloni if (ret < 0) 3841e3929efSAlexandre Belloni return ret; 3851e3929efSAlexandre Belloni 3861e3929efSAlexandre Belloni return 1; 3871e3929efSAlexandre Belloni } 3881e3929efSAlexandre Belloni 3891e3929efSAlexandre Belloni static ssize_t rv8803_nvram_read(struct file *filp, struct kobject *kobj, 3901e3929efSAlexandre Belloni struct bin_attribute *attr, 3911e3929efSAlexandre Belloni char *buf, loff_t off, size_t count) 3921e3929efSAlexandre Belloni { 3931e3929efSAlexandre Belloni struct device *dev = kobj_to_dev(kobj); 3941e3929efSAlexandre Belloni struct i2c_client *client = to_i2c_client(dev); 3951e3929efSAlexandre Belloni int ret; 3961e3929efSAlexandre Belloni 3971e3929efSAlexandre Belloni ret = i2c_smbus_read_byte_data(client, RV8803_RAM); 3981e3929efSAlexandre Belloni if (ret < 0) 3991e3929efSAlexandre Belloni return ret; 4001e3929efSAlexandre Belloni 4011e3929efSAlexandre Belloni buf[0] = ret; 4021e3929efSAlexandre Belloni 4031e3929efSAlexandre Belloni return 1; 4041e3929efSAlexandre Belloni } 4051e3929efSAlexandre Belloni 4061e3929efSAlexandre Belloni static struct bin_attribute rv8803_nvram_attr = { 4071e3929efSAlexandre Belloni .attr = { 4081e3929efSAlexandre Belloni .name = "nvram", 4091e3929efSAlexandre Belloni .mode = S_IRUGO | S_IWUSR, 4101e3929efSAlexandre Belloni }, 4111e3929efSAlexandre Belloni .size = 1, 4121e3929efSAlexandre Belloni .read = rv8803_nvram_read, 4131e3929efSAlexandre Belloni .write = rv8803_nvram_write, 4141e3929efSAlexandre Belloni }; 4151e3929efSAlexandre Belloni 4161e3929efSAlexandre Belloni static struct rtc_class_ops rv8803_rtc_ops = { 4171e3929efSAlexandre Belloni .read_time = rv8803_get_time, 4181e3929efSAlexandre Belloni .set_time = rv8803_set_time, 4191e3929efSAlexandre Belloni .ioctl = rv8803_ioctl, 4201e3929efSAlexandre Belloni }; 4211e3929efSAlexandre Belloni 4221e3929efSAlexandre Belloni static int rv8803_probe(struct i2c_client *client, 4231e3929efSAlexandre Belloni const struct i2c_device_id *id) 4241e3929efSAlexandre Belloni { 4251e3929efSAlexandre Belloni struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent); 4261e3929efSAlexandre Belloni struct rv8803_data *rv8803; 4271e3929efSAlexandre Belloni int err, flags; 4281e3929efSAlexandre Belloni 4291e3929efSAlexandre Belloni if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA | 4301e3929efSAlexandre Belloni I2C_FUNC_SMBUS_I2C_BLOCK)) { 4311e3929efSAlexandre Belloni dev_err(&adapter->dev, "doesn't support I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_I2C_BLOCK\n"); 4321e3929efSAlexandre Belloni return -EIO; 4331e3929efSAlexandre Belloni } 4341e3929efSAlexandre Belloni 4351e3929efSAlexandre Belloni rv8803 = devm_kzalloc(&client->dev, sizeof(struct rv8803_data), 4361e3929efSAlexandre Belloni GFP_KERNEL); 4371e3929efSAlexandre Belloni if (!rv8803) 4381e3929efSAlexandre Belloni return -ENOMEM; 4391e3929efSAlexandre Belloni 440*9d1fa4c3SOleksij Rempel mutex_init(&rv8803->flags_lock); 4411e3929efSAlexandre Belloni rv8803->client = client; 4421e3929efSAlexandre Belloni i2c_set_clientdata(client, rv8803); 4431e3929efSAlexandre Belloni 4441e3929efSAlexandre Belloni flags = i2c_smbus_read_byte_data(client, RV8803_FLAG); 4451e3929efSAlexandre Belloni if (flags < 0) 4461e3929efSAlexandre Belloni return flags; 4471e3929efSAlexandre Belloni 4481e3929efSAlexandre Belloni if (flags & RV8803_FLAG_V1F) 4491e3929efSAlexandre Belloni dev_warn(&client->dev, "Voltage low, temperature compensation stopped.\n"); 4501e3929efSAlexandre Belloni 4511e3929efSAlexandre Belloni if (flags & RV8803_FLAG_V2F) 4521e3929efSAlexandre Belloni dev_warn(&client->dev, "Voltage low, data loss detected.\n"); 4531e3929efSAlexandre Belloni 4541e3929efSAlexandre Belloni if (flags & RV8803_FLAG_AF) 4551e3929efSAlexandre Belloni dev_warn(&client->dev, "An alarm maybe have been missed.\n"); 4561e3929efSAlexandre Belloni 4571e3929efSAlexandre Belloni if (client->irq > 0) { 4581e3929efSAlexandre Belloni err = devm_request_threaded_irq(&client->dev, client->irq, 4591e3929efSAlexandre Belloni NULL, rv8803_handle_irq, 4601e3929efSAlexandre Belloni IRQF_TRIGGER_LOW | IRQF_ONESHOT, 4611e3929efSAlexandre Belloni "rv8803", client); 4621e3929efSAlexandre Belloni if (err) { 4631e3929efSAlexandre Belloni dev_warn(&client->dev, "unable to request IRQ, alarms disabled\n"); 4641e3929efSAlexandre Belloni client->irq = 0; 4651e3929efSAlexandre Belloni } else { 4661e3929efSAlexandre Belloni rv8803_rtc_ops.read_alarm = rv8803_get_alarm; 4671e3929efSAlexandre Belloni rv8803_rtc_ops.set_alarm = rv8803_set_alarm; 4681e3929efSAlexandre Belloni rv8803_rtc_ops.alarm_irq_enable = rv8803_alarm_irq_enable; 4691e3929efSAlexandre Belloni } 4701e3929efSAlexandre Belloni } 4711e3929efSAlexandre Belloni 4721e3929efSAlexandre Belloni rv8803->rtc = devm_rtc_device_register(&client->dev, client->name, 4731e3929efSAlexandre Belloni &rv8803_rtc_ops, THIS_MODULE); 4741e3929efSAlexandre Belloni if (IS_ERR(rv8803->rtc)) { 4751e3929efSAlexandre Belloni dev_err(&client->dev, "unable to register the class device\n"); 4761e3929efSAlexandre Belloni return PTR_ERR(rv8803->rtc); 4771e3929efSAlexandre Belloni } 4781e3929efSAlexandre Belloni 4791e3929efSAlexandre Belloni err = i2c_smbus_write_byte_data(rv8803->client, RV8803_EXT, 4801e3929efSAlexandre Belloni RV8803_EXT_WADA); 4811e3929efSAlexandre Belloni if (err) 4821e3929efSAlexandre Belloni return err; 4831e3929efSAlexandre Belloni 4841e3929efSAlexandre Belloni err = device_create_bin_file(&client->dev, &rv8803_nvram_attr); 4851e3929efSAlexandre Belloni if (err) 4861e3929efSAlexandre Belloni return err; 4871e3929efSAlexandre Belloni 4881e3929efSAlexandre Belloni rv8803->rtc->max_user_freq = 1; 4891e3929efSAlexandre Belloni 4901e3929efSAlexandre Belloni return 0; 4911e3929efSAlexandre Belloni } 4921e3929efSAlexandre Belloni 4931e3929efSAlexandre Belloni static int rv8803_remove(struct i2c_client *client) 4941e3929efSAlexandre Belloni { 4951e3929efSAlexandre Belloni device_remove_bin_file(&client->dev, &rv8803_nvram_attr); 4961e3929efSAlexandre Belloni 4971e3929efSAlexandre Belloni return 0; 4981e3929efSAlexandre Belloni } 4991e3929efSAlexandre Belloni 5001e3929efSAlexandre Belloni static const struct i2c_device_id rv8803_id[] = { 5011e3929efSAlexandre Belloni { "rv8803", 0 }, 50278ef5f2dSGregory CLEMENT { "rx8900", 0 }, 5031e3929efSAlexandre Belloni { } 5041e3929efSAlexandre Belloni }; 5051e3929efSAlexandre Belloni MODULE_DEVICE_TABLE(i2c, rv8803_id); 5061e3929efSAlexandre Belloni 5071e3929efSAlexandre Belloni static struct i2c_driver rv8803_driver = { 5081e3929efSAlexandre Belloni .driver = { 5091e3929efSAlexandre Belloni .name = "rtc-rv8803", 5101e3929efSAlexandre Belloni }, 5111e3929efSAlexandre Belloni .probe = rv8803_probe, 5121e3929efSAlexandre Belloni .remove = rv8803_remove, 5131e3929efSAlexandre Belloni .id_table = rv8803_id, 5141e3929efSAlexandre Belloni }; 5151e3929efSAlexandre Belloni module_i2c_driver(rv8803_driver); 5161e3929efSAlexandre Belloni 5171e3929efSAlexandre Belloni MODULE_AUTHOR("Alexandre Belloni <alexandre.belloni@free-electrons.com>"); 5181e3929efSAlexandre Belloni MODULE_DESCRIPTION("Micro Crystal RV8803 RTC driver"); 5191e3929efSAlexandre Belloni MODULE_LICENSE("GPL v2"); 520