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rtc: rv3028: add new driver
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 <alexandre.belloni@bootlin.com>
This commit is contained in:
Alexandre Belloni
parent
10e7122107
commit
e6e7376cfd
4 changed files with 743 additions and 0 deletions
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@ -52,6 +52,7 @@ emmicro,em3027 EM Microelectronic EM3027 Real-time Clock
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isil,isl1208 Intersil ISL1208 Low Power RTC with Battery Backed SRAM
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isil,isl1218 Intersil ISL1218 Low Power RTC with Battery Backed SRAM
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isil,isl12022 Intersil ISL12022 Real-time Clock
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microcrystal,rv3028 Real Time Clock Module with I2C-Bus
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microcrystal,rv3029 Real Time Clock Module with I2C-Bus
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microcrystal,rv8523 Real Time Clock
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nxp,pcf2127 Real-time clock
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@ -626,6 +626,15 @@ config RTC_DRV_EM3027
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This driver can also be built as a module. If so, the module
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will be called rtc-em3027.
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config RTC_DRV_RV3028
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tristate "Micro Crystal RV3028"
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help
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If you say yes here you get support for the Micro Crystal
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RV3028.
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This driver can also be built as a module. If so, the module
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will be called rtc-rv3028.
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config RTC_DRV_RV8803
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tristate "Micro Crystal RV8803, Epson RX8900"
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help
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@ -139,6 +139,7 @@ obj-$(CONFIG_RTC_DRV_RS5C313) += rtc-rs5c313.o
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obj-$(CONFIG_RTC_DRV_RS5C348) += rtc-rs5c348.o
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obj-$(CONFIG_RTC_DRV_RS5C372) += rtc-rs5c372.o
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obj-$(CONFIG_RTC_DRV_RTD119X) += rtc-rtd119x.o
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obj-$(CONFIG_RTC_DRV_RV3028) += rtc-rv3028.o
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obj-$(CONFIG_RTC_DRV_RV3029C2) += rtc-rv3029c2.o
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obj-$(CONFIG_RTC_DRV_RV8803) += rtc-rv8803.o
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obj-$(CONFIG_RTC_DRV_RX4581) += rtc-rx4581.o
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732
drivers/rtc/rtc-rv3028.c
Normal file
732
drivers/rtc/rtc-rv3028.c
Normal file
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@ -0,0 +1,732 @@
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// SPDX-License-Identifier: GPL-2.0
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/*
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* RTC driver for the Micro Crystal RV3028
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*
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* Copyright (C) 2019 Micro Crystal SA
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*
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* Alexandre Belloni <alexandre.belloni@bootlin.com>
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*
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*/
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#include <linux/bcd.h>
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#include <linux/bitops.h>
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#include <linux/i2c.h>
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <linux/log2.h>
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#include <linux/module.h>
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#include <linux/of_device.h>
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#include <linux/regmap.h>
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#include <linux/rtc.h>
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#define RV3028_SEC 0x00
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#define RV3028_MIN 0x01
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#define RV3028_HOUR 0x02
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#define RV3028_WDAY 0x03
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#define RV3028_DAY 0x04
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#define RV3028_MONTH 0x05
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#define RV3028_YEAR 0x06
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#define RV3028_ALARM_MIN 0x07
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#define RV3028_ALARM_HOUR 0x08
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#define RV3028_ALARM_DAY 0x09
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#define RV3028_STATUS 0x0E
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#define RV3028_CTRL1 0x0F
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#define RV3028_CTRL2 0x10
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#define RV3028_EVT_CTRL 0x13
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#define RV3028_TS_COUNT 0x14
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#define RV3028_TS_SEC 0x15
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#define RV3028_RAM1 0x1F
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#define RV3028_EEPROM_ADDR 0x25
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#define RV3028_EEPROM_DATA 0x26
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#define RV3028_EEPROM_CMD 0x27
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#define RV3028_CLKOUT 0x35
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#define RV3028_OFFSET 0x36
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#define RV3028_BACKUP 0x37
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#define RV3028_STATUS_PORF BIT(0)
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#define RV3028_STATUS_EVF BIT(1)
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#define RV3028_STATUS_AF BIT(2)
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#define RV3028_STATUS_TF BIT(3)
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#define RV3028_STATUS_UF BIT(4)
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#define RV3028_STATUS_BSF BIT(5)
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#define RV3028_STATUS_CLKF BIT(6)
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#define RV3028_STATUS_EEBUSY BIT(7)
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#define RV3028_CTRL1_EERD BIT(3)
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#define RV3028_CTRL1_WADA BIT(5)
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#define RV3028_CTRL2_RESET BIT(0)
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#define RV3028_CTRL2_12_24 BIT(1)
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#define RV3028_CTRL2_EIE BIT(2)
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#define RV3028_CTRL2_AIE BIT(3)
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#define RV3028_CTRL2_TIE BIT(4)
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#define RV3028_CTRL2_UIE BIT(5)
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#define RV3028_CTRL2_TSE BIT(7)
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#define RV3028_EVT_CTRL_TSR BIT(2)
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#define RV3028_EEPROM_CMD_WRITE 0x21
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#define RV3028_EEPROM_CMD_READ 0x22
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#define RV3028_EEBUSY_POLL 10000
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#define RV3028_EEBUSY_TIMEOUT 100000
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#define RV3028_BACKUP_TCE BIT(5)
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#define RV3028_BACKUP_TCR_MASK GENMASK(1,0)
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#define OFFSET_STEP_PPT 953674
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enum rv3028_type {
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rv_3028,
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};
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struct rv3028_data {
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struct regmap *regmap;
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struct rtc_device *rtc;
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enum rv3028_type type;
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};
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static u16 rv3028_trickle_resistors[] = {1000, 3000, 6000, 11000};
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static ssize_t timestamp0_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct rv3028_data *rv3028 = dev_get_drvdata(dev->parent);
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regmap_update_bits(rv3028->regmap, RV3028_EVT_CTRL, RV3028_EVT_CTRL_TSR,
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RV3028_EVT_CTRL_TSR);
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return count;
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};
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static ssize_t timestamp0_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct rv3028_data *rv3028 = dev_get_drvdata(dev->parent);
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struct rtc_time tm;
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int ret, count;
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u8 date[6];
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ret = regmap_read(rv3028->regmap, RV3028_TS_COUNT, &count);
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if (ret)
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return ret;
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if (!count)
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return 0;
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ret = regmap_bulk_read(rv3028->regmap, RV3028_TS_SEC, date,
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sizeof(date));
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if (ret)
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return ret;
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tm.tm_sec = bcd2bin(date[0]);
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tm.tm_min = bcd2bin(date[1]);
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tm.tm_hour = bcd2bin(date[2]);
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tm.tm_mday = bcd2bin(date[3]);
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tm.tm_mon = bcd2bin(date[4]) - 1;
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tm.tm_year = bcd2bin(date[5]) + 100;
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ret = rtc_valid_tm(&tm);
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if (ret)
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return ret;
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return sprintf(buf, "%llu\n",
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(unsigned long long)rtc_tm_to_time64(&tm));
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};
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static DEVICE_ATTR_RW(timestamp0);
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static ssize_t timestamp0_count_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct rv3028_data *rv3028 = dev_get_drvdata(dev->parent);
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int ret, count;
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ret = regmap_read(rv3028->regmap, RV3028_TS_COUNT, &count);
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if (ret)
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return ret;
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return sprintf(buf, "%u\n", count);
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};
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static DEVICE_ATTR_RO(timestamp0_count);
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static struct attribute *rv3028_attrs[] = {
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&dev_attr_timestamp0.attr,
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&dev_attr_timestamp0_count.attr,
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NULL
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};
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static const struct attribute_group rv3028_attr_group = {
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.attrs = rv3028_attrs,
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};
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static irqreturn_t rv3028_handle_irq(int irq, void *dev_id)
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{
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struct rv3028_data *rv3028 = dev_id;
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unsigned long events = 0;
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u32 status = 0, ctrl = 0;
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if (regmap_read(rv3028->regmap, RV3028_STATUS, &status) < 0 ||
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status == 0) {
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return IRQ_NONE;
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}
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if (status & RV3028_STATUS_PORF)
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dev_warn(&rv3028->rtc->dev, "Voltage low, data loss detected.\n");
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if (status & RV3028_STATUS_TF) {
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status |= RV3028_STATUS_TF;
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ctrl |= RV3028_CTRL2_TIE;
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events |= RTC_PF;
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}
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if (status & RV3028_STATUS_AF) {
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status |= RV3028_STATUS_AF;
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ctrl |= RV3028_CTRL2_AIE;
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events |= RTC_AF;
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}
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if (status & RV3028_STATUS_UF) {
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status |= RV3028_STATUS_UF;
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ctrl |= RV3028_CTRL2_UIE;
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events |= RTC_UF;
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}
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if (events) {
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rtc_update_irq(rv3028->rtc, 1, events);
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regmap_update_bits(rv3028->regmap, RV3028_STATUS, status, 0);
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regmap_update_bits(rv3028->regmap, RV3028_CTRL2, ctrl, 0);
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}
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if (status & RV3028_STATUS_EVF) {
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sysfs_notify(&rv3028->rtc->dev.kobj, NULL,
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dev_attr_timestamp0.attr.name);
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dev_warn(&rv3028->rtc->dev, "event detected");
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}
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return IRQ_HANDLED;
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}
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static int rv3028_get_time(struct device *dev, struct rtc_time *tm)
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{
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struct rv3028_data *rv3028 = dev_get_drvdata(dev);
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u8 date[7];
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int ret, status;
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ret = regmap_read(rv3028->regmap, RV3028_STATUS, &status);
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if (ret < 0)
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return ret;
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if (status & RV3028_STATUS_PORF) {
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dev_warn(dev, "Voltage low, data is invalid.\n");
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return -EINVAL;
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}
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ret = regmap_bulk_read(rv3028->regmap, RV3028_SEC, date, sizeof(date));
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if (ret)
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return ret;
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tm->tm_sec = bcd2bin(date[RV3028_SEC] & 0x7f);
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tm->tm_min = bcd2bin(date[RV3028_MIN] & 0x7f);
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tm->tm_hour = bcd2bin(date[RV3028_HOUR] & 0x3f);
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tm->tm_wday = ilog2(date[RV3028_WDAY] & 0x7f);
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tm->tm_mday = bcd2bin(date[RV3028_DAY] & 0x3f);
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tm->tm_mon = bcd2bin(date[RV3028_MONTH] & 0x1f) - 1;
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tm->tm_year = bcd2bin(date[RV3028_YEAR]) + 100;
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return 0;
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}
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static int rv3028_set_time(struct device *dev, struct rtc_time *tm)
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{
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struct rv3028_data *rv3028 = dev_get_drvdata(dev);
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u8 date[7];
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int ret;
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date[RV3028_SEC] = bin2bcd(tm->tm_sec);
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date[RV3028_MIN] = bin2bcd(tm->tm_min);
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date[RV3028_HOUR] = bin2bcd(tm->tm_hour);
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date[RV3028_WDAY] = 1 << (tm->tm_wday);
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date[RV3028_DAY] = bin2bcd(tm->tm_mday);
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date[RV3028_MONTH] = bin2bcd(tm->tm_mon + 1);
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date[RV3028_YEAR] = bin2bcd(tm->tm_year - 100);
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/*
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* Writing to the Seconds register has the same effect as setting RESET
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* bit to 1
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*/
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ret = regmap_bulk_write(rv3028->regmap, RV3028_SEC, date,
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sizeof(date));
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if (ret)
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return ret;
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ret = regmap_update_bits(rv3028->regmap, RV3028_STATUS,
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RV3028_STATUS_PORF, 0);
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return ret;
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}
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static int rv3028_get_alarm(struct device *dev, struct rtc_wkalrm *alrm)
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{
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struct rv3028_data *rv3028 = dev_get_drvdata(dev);
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u8 alarmvals[3];
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int status, ctrl, ret;
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ret = regmap_bulk_read(rv3028->regmap, RV3028_ALARM_MIN, alarmvals,
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sizeof(alarmvals));
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if (ret)
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return ret;
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ret = regmap_read(rv3028->regmap, RV3028_STATUS, &status);
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if (ret < 0)
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return ret;
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ret = regmap_read(rv3028->regmap, RV3028_CTRL2, &ctrl);
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if (ret < 0)
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return ret;
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alrm->time.tm_sec = 0;
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alrm->time.tm_min = bcd2bin(alarmvals[0] & 0x7f);
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alrm->time.tm_hour = bcd2bin(alarmvals[1] & 0x3f);
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alrm->time.tm_mday = bcd2bin(alarmvals[2] & 0x3f);
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alrm->enabled = !!(ctrl & RV3028_CTRL2_AIE);
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alrm->pending = (status & RV3028_STATUS_AF) && alrm->enabled;
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return 0;
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}
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static int rv3028_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
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{
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struct rv3028_data *rv3028 = dev_get_drvdata(dev);
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u8 alarmvals[3];
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u8 ctrl = 0;
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int ret;
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/* The alarm has no seconds, round up to nearest minute */
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if (alrm->time.tm_sec) {
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time64_t alarm_time = rtc_tm_to_time64(&alrm->time);
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alarm_time += 60 - alrm->time.tm_sec;
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rtc_time64_to_tm(alarm_time, &alrm->time);
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}
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ret = regmap_update_bits(rv3028->regmap, RV3028_CTRL2,
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RV3028_CTRL2_AIE | RV3028_CTRL2_UIE, 0);
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if (ret)
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return ret;
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alarmvals[0] = bin2bcd(alrm->time.tm_min);
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alarmvals[1] = bin2bcd(alrm->time.tm_hour);
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alarmvals[2] = bin2bcd(alrm->time.tm_mday);
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ret = regmap_update_bits(rv3028->regmap, RV3028_STATUS,
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RV3028_STATUS_AF, 0);
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if (ret)
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return ret;
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ret = regmap_bulk_write(rv3028->regmap, RV3028_ALARM_MIN, alarmvals,
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sizeof(alarmvals));
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if (ret)
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return ret;
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if (alrm->enabled) {
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if (rv3028->rtc->uie_rtctimer.enabled)
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ctrl |= RV3028_CTRL2_UIE;
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if (rv3028->rtc->aie_timer.enabled)
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ctrl |= RV3028_CTRL2_AIE;
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}
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ret = regmap_update_bits(rv3028->regmap, RV3028_CTRL2,
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RV3028_CTRL2_UIE | RV3028_CTRL2_AIE, ctrl);
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return ret;
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}
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static int rv3028_alarm_irq_enable(struct device *dev, unsigned int enabled)
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{
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struct rv3028_data *rv3028 = dev_get_drvdata(dev);
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int ctrl = 0, ret;
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if (enabled) {
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if (rv3028->rtc->uie_rtctimer.enabled)
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ctrl |= RV3028_CTRL2_UIE;
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if (rv3028->rtc->aie_timer.enabled)
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ctrl |= RV3028_CTRL2_AIE;
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}
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ret = regmap_update_bits(rv3028->regmap, RV3028_STATUS,
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RV3028_STATUS_AF | RV3028_STATUS_UF, 0);
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if (ret)
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return ret;
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ret = regmap_update_bits(rv3028->regmap, RV3028_CTRL2,
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RV3028_CTRL2_UIE | RV3028_CTRL2_AIE, ctrl);
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if (ret)
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return ret;
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return 0;
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}
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static int rv3028_read_offset(struct device *dev, long *offset)
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{
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struct rv3028_data *rv3028 = dev_get_drvdata(dev);
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int ret, value, steps;
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ret = regmap_read(rv3028->regmap, RV3028_OFFSET, &value);
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if (ret < 0)
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return ret;
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steps = sign_extend32(value << 1, 8);
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ret = regmap_read(rv3028->regmap, RV3028_BACKUP, &value);
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if (ret < 0)
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return ret;
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steps += value >> 7;
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*offset = DIV_ROUND_CLOSEST(steps * OFFSET_STEP_PPT, 1000);
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return 0;
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}
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static int rv3028_set_offset(struct device *dev, long offset)
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{
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struct rv3028_data *rv3028 = dev_get_drvdata(dev);
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int ret;
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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 <alexandre.belloni@bootlin.com>");
|
||||
MODULE_DESCRIPTION("Micro Crystal RV3028 RTC driver");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
Loading…
Reference in a new issue