X-Git-Url: http://git.openwrt.org/?a=blobdiff_plain;f=target%2Flinux%2Fbrcm2708%2Fpatches-4.19%2F950-0341-rtc-rv3028-add-new-driver.patch;fp=target%2Flinux%2Fbrcm2708%2Fpatches-4.19%2F950-0341-rtc-rv3028-add-new-driver.patch;h=6a00e82300f72b47e1f483b7082cd15689c678ad;hb=c2308a7e4adbb2acc8ff149f91d1ca46801c135e;hp=0000000000000000000000000000000000000000;hpb=67dcc43f3a22dc3a7ac07a7065971b426feeb043;p=openwrt%2Fstaging%2Fchunkeey.git diff --git a/target/linux/brcm2708/patches-4.19/950-0341-rtc-rv3028-add-new-driver.patch b/target/linux/brcm2708/patches-4.19/950-0341-rtc-rv3028-add-new-driver.patch new file mode 100644 index 0000000000..6a00e82300 --- /dev/null +++ b/target/linux/brcm2708/patches-4.19/950-0341-rtc-rv3028-add-new-driver.patch @@ -0,0 +1,860 @@ +From bb0e317bfc453877805a12f975490ad38b6413f1 Mon Sep 17 00:00:00 2001 +From: Alexandre Belloni +Date: Wed, 13 Feb 2019 00:21:36 +0100 +Subject: [PATCH] rtc: rv3028: add new driver + +upstream commit e6e7376cfd7b3f9b63de3a22792f64d9bfb2ab53. + +Add a driver for the MicroCrystal RV-3028. It is a SMT Real-Time Clock +Module that incorporates an integrated CMOS circuit together with an XTAL. +It has an i2c interface. + +The driver handles date/time, alarms, trickle charging, timestamping, +frequency offset correction, EEPROM and NVRAM. + +Signed-off-by: Alexandre Belloni +--- + Documentation/devicetree/bindings/rtc/rtc.txt | 69 ++ + drivers/rtc/Kconfig | 9 + + drivers/rtc/Makefile | 1 + + drivers/rtc/rtc-rv3028.c | 733 ++++++++++++++++++ + 4 files changed, 812 insertions(+) + create mode 100644 Documentation/devicetree/bindings/rtc/rtc.txt + create mode 100644 drivers/rtc/rtc-rv3028.c + +--- /dev/null ++++ b/Documentation/devicetree/bindings/rtc/rtc.txt +@@ -0,0 +1,69 @@ ++Generic device tree bindings for Real Time Clock devices ++======================================================== ++ ++This document describes generic bindings which can be used to describe Real Time ++Clock devices in a device tree. ++ ++Required properties ++------------------- ++ ++- compatible : name of RTC device following generic names recommended practice. ++ ++For other required properties e.g. to describe register sets, ++clocks, etc. check the binding documentation of the specific driver. ++ ++Optional properties ++------------------- ++ ++- start-year : if provided, the default hardware range supported by the RTC is ++ shifted so the first usable year is the specified one. ++ ++The following properties may not be supported by all drivers. However, if a ++driver wants to support one of the below features, it should adapt the bindings ++below. ++- trickle-resistor-ohms : Selected resistor for trickle charger. Should be given ++ if trickle charger should be enabled ++- trickle-diode-disable : Do not use internal trickle charger diode Should be ++ given if internal trickle charger diode should be ++ disabled ++- wakeup-source : Enables wake up of host system on alarm ++- quartz-load-femtofarads : The capacitive load of the quartz(x-tal), ++ expressed in femto Farad (fF). ++ The default value shall be listed (if optional), ++ and likewise all valid values. ++ ++Trivial RTCs ++------------ ++ ++This is a list of trivial RTC devices that have simple device tree ++bindings, consisting only of a compatible field, an address and ++possibly an interrupt line. ++ ++ ++Compatible Vendor / Chip ++========== ============= ++abracon,abb5zes3 AB-RTCMC-32.768kHz-B5ZE-S3: Real Time Clock/Calendar Module with I2C Interface ++dallas,ds1374 I2C, 32-Bit Binary Counter Watchdog RTC with Trickle Charger and Reset Input/Output ++dallas,ds1672 Dallas DS1672 Real-time Clock ++dallas,ds3232 Extremely Accurate I²C RTC with Integrated Crystal and SRAM ++epson,rx8010 I2C-BUS INTERFACE REAL TIME CLOCK MODULE ++epson,rx8581 I2C-BUS INTERFACE REAL TIME CLOCK MODULE ++emmicro,em3027 EM Microelectronic EM3027 Real-time Clock ++isil,isl1208 Intersil ISL1208 Low Power RTC with Battery Backed SRAM ++isil,isl1218 Intersil ISL1218 Low Power RTC with Battery Backed SRAM ++isil,isl12022 Intersil ISL12022 Real-time Clock ++microcrystal,rv3028 Real Time Clock Module with I2C-Bus ++microcrystal,rv3029 Real Time Clock Module with I2C-Bus ++microcrystal,rv8523 Real Time Clock ++nxp,pcf2127 Real-time clock ++nxp,pcf2129 Real-time clock ++nxp,pcf8563 Real-time clock/calendar ++pericom,pt7c4338 Real-time Clock Module ++ricoh,r2025sd I2C bus SERIAL INTERFACE REAL-TIME CLOCK IC ++ricoh,r2221tl I2C bus SERIAL INTERFACE REAL-TIME CLOCK IC ++ricoh,rs5c372a I2C bus SERIAL INTERFACE REAL-TIME CLOCK IC ++ricoh,rs5c372b I2C bus SERIAL INTERFACE REAL-TIME CLOCK IC ++ricoh,rv5c386 I2C bus SERIAL INTERFACE REAL-TIME CLOCK IC ++ricoh,rv5c387a I2C bus SERIAL INTERFACE REAL-TIME CLOCK IC ++sii,s35390a 2-wire CMOS real-time clock ++whwave,sd3078 I2C bus SERIAL INTERFACE REAL-TIME CLOCK IC +--- a/drivers/rtc/Kconfig ++++ b/drivers/rtc/Kconfig +@@ -625,6 +625,15 @@ config RTC_DRV_EM3027 + This driver can also be built as a module. If so, the module + will be called rtc-em3027. + ++config RTC_DRV_RV3028 ++ tristate "Micro Crystal RV3028" ++ help ++ If you say yes here you get support for the Micro Crystal ++ RV3028. ++ ++ This driver can also be built as a module. If so, the module ++ will be called rtc-rv3028. ++ + config RTC_DRV_RV8803 + tristate "Micro Crystal RV8803, Epson RX8900" + help +--- a/drivers/rtc/Makefile ++++ b/drivers/rtc/Makefile +@@ -136,6 +136,7 @@ obj-$(CONFIG_RTC_DRV_RS5C313) += rtc-rs5 + obj-$(CONFIG_RTC_DRV_RS5C348) += rtc-rs5c348.o + obj-$(CONFIG_RTC_DRV_RS5C372) += rtc-rs5c372.o + obj-$(CONFIG_RTC_DRV_RTD119X) += rtc-rtd119x.o ++obj-$(CONFIG_RTC_DRV_RV3028) += rtc-rv3028.o + obj-$(CONFIG_RTC_DRV_RV3029C2) += rtc-rv3029c2.o + obj-$(CONFIG_RTC_DRV_RV8803) += rtc-rv8803.o + obj-$(CONFIG_RTC_DRV_RX4581) += rtc-rx4581.o +--- /dev/null ++++ b/drivers/rtc/rtc-rv3028.c +@@ -0,0 +1,733 @@ ++// SPDX-License-Identifier: GPL-2.0 ++/* ++ * RTC driver for the Micro Crystal RV3028 ++ * ++ * Copyright (C) 2019 Micro Crystal SA ++ * ++ * Alexandre Belloni ++ * ++ */ ++ ++#include ++#include ++#include ++#include ++#include ++#include ++#include ++#include ++#include ++#include ++#include "rtc-core.h" ++ ++#define RV3028_SEC 0x00 ++#define RV3028_MIN 0x01 ++#define RV3028_HOUR 0x02 ++#define RV3028_WDAY 0x03 ++#define RV3028_DAY 0x04 ++#define RV3028_MONTH 0x05 ++#define RV3028_YEAR 0x06 ++#define RV3028_ALARM_MIN 0x07 ++#define RV3028_ALARM_HOUR 0x08 ++#define RV3028_ALARM_DAY 0x09 ++#define RV3028_STATUS 0x0E ++#define RV3028_CTRL1 0x0F ++#define RV3028_CTRL2 0x10 ++#define RV3028_EVT_CTRL 0x13 ++#define RV3028_TS_COUNT 0x14 ++#define RV3028_TS_SEC 0x15 ++#define RV3028_RAM1 0x1F ++#define RV3028_EEPROM_ADDR 0x25 ++#define RV3028_EEPROM_DATA 0x26 ++#define RV3028_EEPROM_CMD 0x27 ++#define RV3028_CLKOUT 0x35 ++#define RV3028_OFFSET 0x36 ++#define RV3028_BACKUP 0x37 ++ ++#define RV3028_STATUS_PORF BIT(0) ++#define RV3028_STATUS_EVF BIT(1) ++#define RV3028_STATUS_AF BIT(2) ++#define RV3028_STATUS_TF BIT(3) ++#define RV3028_STATUS_UF BIT(4) ++#define RV3028_STATUS_BSF BIT(5) ++#define RV3028_STATUS_CLKF BIT(6) ++#define RV3028_STATUS_EEBUSY BIT(7) ++ ++#define RV3028_CTRL1_EERD BIT(3) ++#define RV3028_CTRL1_WADA BIT(5) ++ ++#define RV3028_CTRL2_RESET BIT(0) ++#define RV3028_CTRL2_12_24 BIT(1) ++#define RV3028_CTRL2_EIE BIT(2) ++#define RV3028_CTRL2_AIE BIT(3) ++#define RV3028_CTRL2_TIE BIT(4) ++#define RV3028_CTRL2_UIE BIT(5) ++#define RV3028_CTRL2_TSE BIT(7) ++ ++#define RV3028_EVT_CTRL_TSR BIT(2) ++ ++#define RV3028_EEPROM_CMD_WRITE 0x21 ++#define RV3028_EEPROM_CMD_READ 0x22 ++ ++#define RV3028_EEBUSY_POLL 10000 ++#define RV3028_EEBUSY_TIMEOUT 100000 ++ ++#define RV3028_BACKUP_TCE BIT(5) ++#define RV3028_BACKUP_TCR_MASK GENMASK(1,0) ++ ++#define OFFSET_STEP_PPT 953674 ++ ++enum rv3028_type { ++ rv_3028, ++}; ++ ++struct rv3028_data { ++ struct regmap *regmap; ++ struct rtc_device *rtc; ++ enum rv3028_type type; ++}; ++ ++static u16 rv3028_trickle_resistors[] = {1000, 3000, 6000, 11000}; ++ ++static ssize_t timestamp0_store(struct device *dev, ++ struct device_attribute *attr, ++ const char *buf, size_t count) ++{ ++ struct rv3028_data *rv3028 = dev_get_drvdata(dev->parent); ++ ++ regmap_update_bits(rv3028->regmap, RV3028_EVT_CTRL, RV3028_EVT_CTRL_TSR, ++ RV3028_EVT_CTRL_TSR); ++ ++ return count; ++}; ++ ++static ssize_t timestamp0_show(struct device *dev, ++ struct device_attribute *attr, char *buf) ++{ ++ struct rv3028_data *rv3028 = dev_get_drvdata(dev->parent); ++ struct rtc_time tm; ++ int ret, count; ++ u8 date[6]; ++ ++ ret = regmap_read(rv3028->regmap, RV3028_TS_COUNT, &count); ++ if (ret) ++ return ret; ++ ++ if (!count) ++ return 0; ++ ++ ret = regmap_bulk_read(rv3028->regmap, RV3028_TS_SEC, date, ++ sizeof(date)); ++ if (ret) ++ return ret; ++ ++ tm.tm_sec = bcd2bin(date[0]); ++ tm.tm_min = bcd2bin(date[1]); ++ tm.tm_hour = bcd2bin(date[2]); ++ tm.tm_mday = bcd2bin(date[3]); ++ tm.tm_mon = bcd2bin(date[4]) - 1; ++ tm.tm_year = bcd2bin(date[5]) + 100; ++ ++ ret = rtc_valid_tm(&tm); ++ if (ret) ++ return ret; ++ ++ return sprintf(buf, "%llu\n", ++ (unsigned long long)rtc_tm_to_time64(&tm)); ++}; ++ ++static DEVICE_ATTR_RW(timestamp0); ++ ++static ssize_t timestamp0_count_show(struct device *dev, ++ struct device_attribute *attr, char *buf) ++{ ++ struct rv3028_data *rv3028 = dev_get_drvdata(dev->parent); ++ int ret, count; ++ ++ ret = regmap_read(rv3028->regmap, RV3028_TS_COUNT, &count); ++ if (ret) ++ return ret; ++ ++ return sprintf(buf, "%u\n", count); ++}; ++ ++static DEVICE_ATTR_RO(timestamp0_count); ++ ++static struct attribute *rv3028_attrs[] = { ++ &dev_attr_timestamp0.attr, ++ &dev_attr_timestamp0_count.attr, ++ NULL ++}; ++ ++static const struct attribute_group rv3028_attr_group = { ++ .attrs = rv3028_attrs, ++}; ++ ++static irqreturn_t rv3028_handle_irq(int irq, void *dev_id) ++{ ++ struct rv3028_data *rv3028 = dev_id; ++ unsigned long events = 0; ++ u32 status = 0, ctrl = 0; ++ ++ if (regmap_read(rv3028->regmap, RV3028_STATUS, &status) < 0 || ++ status == 0) { ++ return IRQ_NONE; ++ } ++ ++ if (status & RV3028_STATUS_PORF) ++ dev_warn(&rv3028->rtc->dev, "Voltage low, data loss detected.\n"); ++ ++ if (status & RV3028_STATUS_TF) { ++ status |= RV3028_STATUS_TF; ++ ctrl |= RV3028_CTRL2_TIE; ++ events |= RTC_PF; ++ } ++ ++ if (status & RV3028_STATUS_AF) { ++ status |= RV3028_STATUS_AF; ++ ctrl |= RV3028_CTRL2_AIE; ++ events |= RTC_AF; ++ } ++ ++ if (status & RV3028_STATUS_UF) { ++ status |= RV3028_STATUS_UF; ++ ctrl |= RV3028_CTRL2_UIE; ++ events |= RTC_UF; ++ } ++ ++ if (events) { ++ rtc_update_irq(rv3028->rtc, 1, events); ++ regmap_update_bits(rv3028->regmap, RV3028_STATUS, status, 0); ++ regmap_update_bits(rv3028->regmap, RV3028_CTRL2, ctrl, 0); ++ } ++ ++ if (status & RV3028_STATUS_EVF) { ++ sysfs_notify(&rv3028->rtc->dev.kobj, NULL, ++ dev_attr_timestamp0.attr.name); ++ dev_warn(&rv3028->rtc->dev, "event detected"); ++ } ++ ++ return IRQ_HANDLED; ++} ++ ++static int rv3028_get_time(struct device *dev, struct rtc_time *tm) ++{ ++ struct rv3028_data *rv3028 = dev_get_drvdata(dev); ++ u8 date[7]; ++ int ret, status; ++ ++ ret = regmap_read(rv3028->regmap, RV3028_STATUS, &status); ++ if (ret < 0) ++ return ret; ++ ++ if (status & RV3028_STATUS_PORF) { ++ dev_warn(dev, "Voltage low, data is invalid.\n"); ++ return -EINVAL; ++ } ++ ++ ret = regmap_bulk_read(rv3028->regmap, RV3028_SEC, date, sizeof(date)); ++ if (ret) ++ return ret; ++ ++ tm->tm_sec = bcd2bin(date[RV3028_SEC] & 0x7f); ++ tm->tm_min = bcd2bin(date[RV3028_MIN] & 0x7f); ++ tm->tm_hour = bcd2bin(date[RV3028_HOUR] & 0x3f); ++ tm->tm_wday = ilog2(date[RV3028_WDAY] & 0x7f); ++ tm->tm_mday = bcd2bin(date[RV3028_DAY] & 0x3f); ++ tm->tm_mon = bcd2bin(date[RV3028_MONTH] & 0x1f) - 1; ++ tm->tm_year = bcd2bin(date[RV3028_YEAR]) + 100; ++ ++ return 0; ++} ++ ++static int rv3028_set_time(struct device *dev, struct rtc_time *tm) ++{ ++ struct rv3028_data *rv3028 = dev_get_drvdata(dev); ++ u8 date[7]; ++ int ret; ++ ++ date[RV3028_SEC] = bin2bcd(tm->tm_sec); ++ date[RV3028_MIN] = bin2bcd(tm->tm_min); ++ date[RV3028_HOUR] = bin2bcd(tm->tm_hour); ++ date[RV3028_WDAY] = 1 << (tm->tm_wday); ++ date[RV3028_DAY] = bin2bcd(tm->tm_mday); ++ date[RV3028_MONTH] = bin2bcd(tm->tm_mon + 1); ++ date[RV3028_YEAR] = bin2bcd(tm->tm_year - 100); ++ ++ /* ++ * Writing to the Seconds register has the same effect as setting RESET ++ * bit to 1 ++ */ ++ ret = regmap_bulk_write(rv3028->regmap, RV3028_SEC, date, ++ sizeof(date)); ++ if (ret) ++ return ret; ++ ++ ret = regmap_update_bits(rv3028->regmap, RV3028_STATUS, ++ RV3028_STATUS_PORF, 0); ++ ++ return ret; ++} ++ ++static int rv3028_get_alarm(struct device *dev, struct rtc_wkalrm *alrm) ++{ ++ struct rv3028_data *rv3028 = dev_get_drvdata(dev); ++ u8 alarmvals[3]; ++ int status, ctrl, ret; ++ ++ ret = regmap_bulk_read(rv3028->regmap, RV3028_ALARM_MIN, alarmvals, ++ sizeof(alarmvals)); ++ if (ret) ++ return ret; ++ ++ ret = regmap_read(rv3028->regmap, RV3028_STATUS, &status); ++ if (ret < 0) ++ return ret; ++ ++ ret = regmap_read(rv3028->regmap, RV3028_CTRL2, &ctrl); ++ if (ret < 0) ++ return ret; ++ ++ alrm->time.tm_sec = 0; ++ alrm->time.tm_min = bcd2bin(alarmvals[0] & 0x7f); ++ alrm->time.tm_hour = bcd2bin(alarmvals[1] & 0x3f); ++ alrm->time.tm_mday = bcd2bin(alarmvals[2] & 0x3f); ++ ++ alrm->enabled = !!(ctrl & RV3028_CTRL2_AIE); ++ alrm->pending = (status & RV3028_STATUS_AF) && alrm->enabled; ++ ++ return 0; ++} ++ ++static int rv3028_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) ++{ ++ struct rv3028_data *rv3028 = dev_get_drvdata(dev); ++ u8 alarmvals[3]; ++ u8 ctrl = 0; ++ int ret; ++ ++ /* The alarm has no seconds, round up to nearest minute */ ++ if (alrm->time.tm_sec) { ++ time64_t alarm_time = rtc_tm_to_time64(&alrm->time); ++ ++ alarm_time += 60 - alrm->time.tm_sec; ++ rtc_time64_to_tm(alarm_time, &alrm->time); ++ } ++ ++ ret = regmap_update_bits(rv3028->regmap, RV3028_CTRL2, ++ RV3028_CTRL2_AIE | RV3028_CTRL2_UIE, 0); ++ if (ret) ++ return ret; ++ ++ alarmvals[0] = bin2bcd(alrm->time.tm_min); ++ alarmvals[1] = bin2bcd(alrm->time.tm_hour); ++ alarmvals[2] = bin2bcd(alrm->time.tm_mday); ++ ++ ret = regmap_update_bits(rv3028->regmap, RV3028_STATUS, ++ RV3028_STATUS_AF, 0); ++ if (ret) ++ return ret; ++ ++ ret = regmap_bulk_write(rv3028->regmap, RV3028_ALARM_MIN, alarmvals, ++ sizeof(alarmvals)); ++ if (ret) ++ return ret; ++ ++ if (alrm->enabled) { ++ if (rv3028->rtc->uie_rtctimer.enabled) ++ ctrl |= RV3028_CTRL2_UIE; ++ if (rv3028->rtc->aie_timer.enabled) ++ ctrl |= RV3028_CTRL2_AIE; ++ } ++ ++ ret = regmap_update_bits(rv3028->regmap, RV3028_CTRL2, ++ RV3028_CTRL2_UIE | RV3028_CTRL2_AIE, ctrl); ++ ++ return ret; ++} ++ ++static int rv3028_alarm_irq_enable(struct device *dev, unsigned int enabled) ++{ ++ struct rv3028_data *rv3028 = dev_get_drvdata(dev); ++ int ctrl = 0, ret; ++ ++ if (enabled) { ++ if (rv3028->rtc->uie_rtctimer.enabled) ++ ctrl |= RV3028_CTRL2_UIE; ++ if (rv3028->rtc->aie_timer.enabled) ++ ctrl |= RV3028_CTRL2_AIE; ++ } ++ ++ ret = regmap_update_bits(rv3028->regmap, RV3028_STATUS, ++ RV3028_STATUS_AF | RV3028_STATUS_UF, 0); ++ if (ret) ++ return ret; ++ ++ ret = regmap_update_bits(rv3028->regmap, RV3028_CTRL2, ++ RV3028_CTRL2_UIE | RV3028_CTRL2_AIE, ctrl); ++ if (ret) ++ return ret; ++ ++ return 0; ++} ++ ++static int rv3028_read_offset(struct device *dev, long *offset) ++{ ++ struct rv3028_data *rv3028 = dev_get_drvdata(dev); ++ int ret, value, steps; ++ ++ ret = regmap_read(rv3028->regmap, RV3028_OFFSET, &value); ++ if (ret < 0) ++ return ret; ++ ++ steps = sign_extend32(value << 1, 8); ++ ++ ret = regmap_read(rv3028->regmap, RV3028_BACKUP, &value); ++ if (ret < 0) ++ return ret; ++ ++ steps += value >> 7; ++ ++ *offset = DIV_ROUND_CLOSEST(steps * OFFSET_STEP_PPT, 1000); ++ ++ return 0; ++} ++ ++static int rv3028_set_offset(struct device *dev, long offset) ++{ ++ struct rv3028_data *rv3028 = dev_get_drvdata(dev); ++ int ret; ++ ++ offset = clamp(offset, -244141L, 243187L) * 1000; ++ offset = DIV_ROUND_CLOSEST(offset, OFFSET_STEP_PPT); ++ ++ ret = regmap_write(rv3028->regmap, RV3028_OFFSET, offset >> 1); ++ if (ret < 0) ++ return ret; ++ ++ return regmap_update_bits(rv3028->regmap, RV3028_BACKUP, BIT(7), ++ offset << 7); ++} ++ ++static int rv3028_ioctl(struct device *dev, unsigned int cmd, unsigned long arg) ++{ ++ struct rv3028_data *rv3028 = dev_get_drvdata(dev); ++ int status, ret = 0; ++ ++ switch (cmd) { ++ case RTC_VL_READ: ++ ret = regmap_read(rv3028->regmap, RV3028_STATUS, &status); ++ if (ret < 0) ++ return ret; ++ ++ if (status & RV3028_STATUS_PORF) ++ dev_warn(&rv3028->rtc->dev, "Voltage low, data loss detected.\n"); ++ ++ status &= RV3028_STATUS_PORF; ++ ++ if (copy_to_user((void __user *)arg, &status, sizeof(int))) ++ return -EFAULT; ++ ++ return 0; ++ ++ case RTC_VL_CLR: ++ ret = regmap_update_bits(rv3028->regmap, RV3028_STATUS, ++ RV3028_STATUS_PORF, 0); ++ ++ return ret; ++ ++ default: ++ return -ENOIOCTLCMD; ++ } ++} ++ ++static int rv3028_nvram_write(void *priv, unsigned int offset, void *val, ++ size_t bytes) ++{ ++ return regmap_bulk_write(priv, RV3028_RAM1 + offset, val, bytes); ++} ++ ++static int rv3028_nvram_read(void *priv, unsigned int offset, void *val, ++ size_t bytes) ++{ ++ return regmap_bulk_read(priv, RV3028_RAM1 + offset, val, bytes); ++} ++ ++static int rv3028_eeprom_write(void *priv, unsigned int offset, void *val, ++ size_t bytes) ++{ ++ u32 status, ctrl1; ++ int i, ret, err; ++ u8 *buf = val; ++ ++ ret = regmap_read(priv, RV3028_CTRL1, &ctrl1); ++ if (ret) ++ return ret; ++ ++ if (!(ctrl1 & RV3028_CTRL1_EERD)) { ++ ret = regmap_update_bits(priv, RV3028_CTRL1, ++ RV3028_CTRL1_EERD, RV3028_CTRL1_EERD); ++ if (ret) ++ return ret; ++ ++ ret = regmap_read_poll_timeout(priv, RV3028_STATUS, status, ++ !(status & RV3028_STATUS_EEBUSY), ++ RV3028_EEBUSY_POLL, ++ RV3028_EEBUSY_TIMEOUT); ++ if (ret) ++ goto restore_eerd; ++ } ++ ++ for (i = 0; i < bytes; i++) { ++ ret = regmap_write(priv, RV3028_EEPROM_ADDR, offset + i); ++ if (ret) ++ goto restore_eerd; ++ ++ ret = regmap_write(priv, RV3028_EEPROM_DATA, buf[i]); ++ if (ret) ++ goto restore_eerd; ++ ++ ret = regmap_write(priv, RV3028_EEPROM_CMD, 0x0); ++ if (ret) ++ goto restore_eerd; ++ ++ ret = regmap_write(priv, RV3028_EEPROM_CMD, ++ RV3028_EEPROM_CMD_WRITE); ++ if (ret) ++ goto restore_eerd; ++ ++ usleep_range(RV3028_EEBUSY_POLL, RV3028_EEBUSY_TIMEOUT); ++ ++ ret = regmap_read_poll_timeout(priv, RV3028_STATUS, status, ++ !(status & RV3028_STATUS_EEBUSY), ++ RV3028_EEBUSY_POLL, ++ RV3028_EEBUSY_TIMEOUT); ++ if (ret) ++ goto restore_eerd; ++ } ++ ++restore_eerd: ++ if (!(ctrl1 & RV3028_CTRL1_EERD)) ++ { ++ err = regmap_update_bits(priv, RV3028_CTRL1, RV3028_CTRL1_EERD, ++ 0); ++ if (err && !ret) ++ ret = err; ++ } ++ ++ return ret; ++} ++ ++static int rv3028_eeprom_read(void *priv, unsigned int offset, void *val, ++ size_t bytes) ++{ ++ u32 status, ctrl1, data; ++ int i, ret, err; ++ u8 *buf = val; ++ ++ ret = regmap_read(priv, RV3028_CTRL1, &ctrl1); ++ if (ret) ++ return ret; ++ ++ if (!(ctrl1 & RV3028_CTRL1_EERD)) { ++ ret = regmap_update_bits(priv, RV3028_CTRL1, ++ RV3028_CTRL1_EERD, RV3028_CTRL1_EERD); ++ if (ret) ++ return ret; ++ ++ ret = regmap_read_poll_timeout(priv, RV3028_STATUS, status, ++ !(status & RV3028_STATUS_EEBUSY), ++ RV3028_EEBUSY_POLL, ++ RV3028_EEBUSY_TIMEOUT); ++ if (ret) ++ goto restore_eerd; ++ } ++ ++ for (i = 0; i < bytes; i++) { ++ ret = regmap_write(priv, RV3028_EEPROM_ADDR, offset + i); ++ if (ret) ++ goto restore_eerd; ++ ++ ret = regmap_write(priv, RV3028_EEPROM_CMD, 0x0); ++ if (ret) ++ goto restore_eerd; ++ ++ ret = regmap_write(priv, RV3028_EEPROM_CMD, ++ RV3028_EEPROM_CMD_READ); ++ if (ret) ++ goto restore_eerd; ++ ++ ret = regmap_read_poll_timeout(priv, RV3028_STATUS, status, ++ !(status & RV3028_STATUS_EEBUSY), ++ RV3028_EEBUSY_POLL, ++ RV3028_EEBUSY_TIMEOUT); ++ if (ret) ++ goto restore_eerd; ++ ++ ret = regmap_read(priv, RV3028_EEPROM_DATA, &data); ++ if (ret) ++ goto restore_eerd; ++ buf[i] = data; ++ } ++ ++restore_eerd: ++ if (!(ctrl1 & RV3028_CTRL1_EERD)) ++ { ++ err = regmap_update_bits(priv, RV3028_CTRL1, RV3028_CTRL1_EERD, ++ 0); ++ if (err && !ret) ++ ret = err; ++ } ++ ++ return ret; ++} ++ ++static struct rtc_class_ops rv3028_rtc_ops = { ++ .read_time = rv3028_get_time, ++ .set_time = rv3028_set_time, ++ .read_offset = rv3028_read_offset, ++ .set_offset = rv3028_set_offset, ++ .ioctl = rv3028_ioctl, ++}; ++ ++static const struct regmap_config regmap_config = { ++ .reg_bits = 8, ++ .val_bits = 8, ++ .max_register = 0x37, ++}; ++ ++static int rv3028_probe(struct i2c_client *client) ++{ ++ struct rv3028_data *rv3028; ++ int ret, status; ++ u32 ohms; ++ struct nvmem_config nvmem_cfg = { ++ .name = "rv3028_nvram", ++ .word_size = 1, ++ .stride = 1, ++ .size = 2, ++ .type = NVMEM_TYPE_BATTERY_BACKED, ++ .reg_read = rv3028_nvram_read, ++ .reg_write = rv3028_nvram_write, ++ }; ++ struct nvmem_config eeprom_cfg = { ++ .name = "rv3028_eeprom", ++ .word_size = 1, ++ .stride = 1, ++ .size = 43, ++ .type = NVMEM_TYPE_EEPROM, ++ .reg_read = rv3028_eeprom_read, ++ .reg_write = rv3028_eeprom_write, ++ }; ++ ++ rv3028 = devm_kzalloc(&client->dev, sizeof(struct rv3028_data), ++ GFP_KERNEL); ++ if (!rv3028) ++ return -ENOMEM; ++ ++ rv3028->regmap = devm_regmap_init_i2c(client, ®map_config); ++ ++ i2c_set_clientdata(client, rv3028); ++ ++ ret = regmap_read(rv3028->regmap, RV3028_STATUS, &status); ++ if (ret < 0) ++ return ret; ++ ++ if (status & RV3028_STATUS_PORF) ++ dev_warn(&client->dev, "Voltage low, data loss detected.\n"); ++ ++ if (status & RV3028_STATUS_AF) ++ dev_warn(&client->dev, "An alarm may have been missed.\n"); ++ ++ rv3028->rtc = devm_rtc_allocate_device(&client->dev); ++ if (IS_ERR(rv3028->rtc)) { ++ return PTR_ERR(rv3028->rtc); ++ } ++ ++ if (client->irq > 0) { ++ ret = devm_request_threaded_irq(&client->dev, client->irq, ++ NULL, rv3028_handle_irq, ++ IRQF_TRIGGER_LOW | IRQF_ONESHOT, ++ "rv3028", rv3028); ++ if (ret) { ++ dev_warn(&client->dev, "unable to request IRQ, alarms disabled\n"); ++ client->irq = 0; ++ } else { ++ rv3028_rtc_ops.read_alarm = rv3028_get_alarm; ++ rv3028_rtc_ops.set_alarm = rv3028_set_alarm; ++ rv3028_rtc_ops.alarm_irq_enable = rv3028_alarm_irq_enable; ++ } ++ } ++ ++ ret = regmap_update_bits(rv3028->regmap, RV3028_CTRL1, ++ RV3028_CTRL1_WADA, RV3028_CTRL1_WADA); ++ if (ret) ++ return ret; ++ ++ /* setup timestamping */ ++ ret = regmap_update_bits(rv3028->regmap, RV3028_CTRL2, ++ RV3028_CTRL2_EIE | RV3028_CTRL2_TSE, ++ RV3028_CTRL2_EIE | RV3028_CTRL2_TSE); ++ if (ret) ++ return ret; ++ ++ /* setup trickle charger */ ++ if (!device_property_read_u32(&client->dev, "trickle-resistor-ohms", ++ &ohms)) { ++ int i; ++ ++ for (i = 0; i < ARRAY_SIZE(rv3028_trickle_resistors); i++) ++ if (ohms == rv3028_trickle_resistors[i]) ++ break; ++ ++ if (i < ARRAY_SIZE(rv3028_trickle_resistors)) { ++ ret = regmap_update_bits(rv3028->regmap, RV3028_BACKUP, ++ RV3028_BACKUP_TCE | ++ RV3028_BACKUP_TCR_MASK, ++ RV3028_BACKUP_TCE | i); ++ if (ret) ++ return ret; ++ } else { ++ dev_warn(&client->dev, "invalid trickle resistor value\n"); ++ } ++ } ++ ++ ret = rtc_add_group(rv3028->rtc, &rv3028_attr_group); ++ if (ret) ++ return ret; ++ ++ rv3028->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000; ++ rv3028->rtc->range_max = RTC_TIMESTAMP_END_2099; ++ rv3028->rtc->ops = &rv3028_rtc_ops; ++ ret = rtc_register_device(rv3028->rtc); ++ if (ret) ++ return ret; ++ ++ nvmem_cfg.priv = rv3028->regmap; ++ rtc_nvmem_register(rv3028->rtc, &nvmem_cfg); ++ eeprom_cfg.priv = rv3028->regmap; ++ rtc_nvmem_register(rv3028->rtc, &eeprom_cfg); ++ ++ rv3028->rtc->max_user_freq = 1; ++ ++ return 0; ++} ++ ++static const struct of_device_id rv3028_of_match[] = { ++ { .compatible = "microcrystal,rv3028", }, ++ { } ++}; ++MODULE_DEVICE_TABLE(of, rv3028_of_match); ++ ++static struct i2c_driver rv3028_driver = { ++ .driver = { ++ .name = "rtc-rv3028", ++ .of_match_table = of_match_ptr(rv3028_of_match), ++ }, ++ .probe_new = rv3028_probe, ++}; ++module_i2c_driver(rv3028_driver); ++ ++MODULE_AUTHOR("Alexandre Belloni "); ++MODULE_DESCRIPTION("Micro Crystal RV3028 RTC driver"); ++MODULE_LICENSE("GPL v2");