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935 lines
22 KiB
935 lines
22 KiB
// 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 <[email protected]> |
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* |
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*/ |
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#include <linux/clk-provider.h> |
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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_CLKOUT_FD_MASK GENMASK(2, 0) |
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#define RV3028_CLKOUT_PORIE BIT(3) |
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#define RV3028_CLKOUT_CLKSY BIT(6) |
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#define RV3028_CLKOUT_CLKOE 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_UPDATE 0x11 |
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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 RV3028_BACKUP_BSM_MASK 0x0C |
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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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#ifdef CONFIG_COMMON_CLK |
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struct clk_hw clkout_hw; |
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#endif |
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}; |
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static u16 rv3028_trickle_resistors[] = {3000, 5000, 9000, 15000}; |
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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 int rv3028_exit_eerd(struct rv3028_data *rv3028, u32 eerd) |
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{ |
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if (eerd) |
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return 0; |
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return regmap_update_bits(rv3028->regmap, RV3028_CTRL1, RV3028_CTRL1_EERD, 0); |
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} |
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static int rv3028_enter_eerd(struct rv3028_data *rv3028, u32 *eerd) |
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{ |
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u32 ctrl1, status; |
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int ret; |
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ret = regmap_read(rv3028->regmap, RV3028_CTRL1, &ctrl1); |
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if (ret) |
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return ret; |
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*eerd = ctrl1 & RV3028_CTRL1_EERD; |
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if (*eerd) |
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return 0; |
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ret = regmap_update_bits(rv3028->regmap, RV3028_CTRL1, |
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RV3028_CTRL1_EERD, RV3028_CTRL1_EERD); |
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if (ret) |
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return ret; |
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ret = regmap_read_poll_timeout(rv3028->regmap, RV3028_STATUS, status, |
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!(status & RV3028_STATUS_EEBUSY), |
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RV3028_EEBUSY_POLL, RV3028_EEBUSY_TIMEOUT); |
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if (ret) { |
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rv3028_exit_eerd(rv3028, *eerd); |
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return ret; |
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} |
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return 0; |
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} |
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static int rv3028_update_eeprom(struct rv3028_data *rv3028, u32 eerd) |
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{ |
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u32 status; |
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int ret; |
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ret = regmap_write(rv3028->regmap, RV3028_EEPROM_CMD, 0x0); |
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if (ret) |
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goto exit_eerd; |
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ret = regmap_write(rv3028->regmap, RV3028_EEPROM_CMD, RV3028_EEPROM_CMD_UPDATE); |
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if (ret) |
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goto exit_eerd; |
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usleep_range(63000, RV3028_EEBUSY_TIMEOUT); |
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ret = regmap_read_poll_timeout(rv3028->regmap, RV3028_STATUS, status, |
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!(status & RV3028_STATUS_EEBUSY), |
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RV3028_EEBUSY_POLL, RV3028_EEBUSY_TIMEOUT); |
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exit_eerd: |
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rv3028_exit_eerd(rv3028, eerd); |
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return ret; |
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} |
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static int rv3028_update_cfg(struct rv3028_data *rv3028, unsigned int reg, |
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unsigned int mask, unsigned int val) |
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{ |
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u32 eerd; |
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int ret; |
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ret = rv3028_enter_eerd(rv3028, &eerd); |
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if (ret) |
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return ret; |
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ret = regmap_update_bits(rv3028->regmap, reg, mask, val); |
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if (ret) { |
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rv3028_exit_eerd(rv3028, eerd); |
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return ret; |
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} |
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return rv3028_update_eeprom(rv3028, eerd); |
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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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status &= ~RV3028_STATUS_PORF; |
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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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return -EINVAL; |
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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 = 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] = 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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/* |
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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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|
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return 0; |
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} |
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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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|
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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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|
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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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|
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return 0; |
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} |
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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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u32 eerd; |
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int ret; |
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|
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offset = clamp(offset, -244141L, 243187L) * 1000; |
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offset = DIV_ROUND_CLOSEST(offset, OFFSET_STEP_PPT); |
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ret = rv3028_enter_eerd(rv3028, &eerd); |
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if (ret) |
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return ret; |
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ret = regmap_write(rv3028->regmap, RV3028_OFFSET, offset >> 1); |
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if (ret < 0) |
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goto exit_eerd; |
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ret = regmap_update_bits(rv3028->regmap, RV3028_BACKUP, BIT(7), |
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offset << 7); |
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if (ret < 0) |
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goto exit_eerd; |
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return rv3028_update_eeprom(rv3028, eerd); |
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exit_eerd: |
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rv3028_exit_eerd(rv3028, eerd); |
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|
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return ret; |
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|
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} |
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|
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static int rv3028_ioctl(struct device *dev, unsigned int cmd, unsigned long arg) |
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{ |
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struct rv3028_data *rv3028 = dev_get_drvdata(dev); |
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int status, ret = 0; |
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|
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switch (cmd) { |
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case RTC_VL_READ: |
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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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|
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status = status & RV3028_STATUS_PORF ? RTC_VL_DATA_INVALID : 0; |
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return put_user(status, (unsigned int __user *)arg); |
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|
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default: |
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return -ENOIOCTLCMD; |
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} |
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} |
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|
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static int rv3028_nvram_write(void *priv, unsigned int offset, void *val, |
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size_t bytes) |
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{ |
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return regmap_bulk_write(priv, RV3028_RAM1 + offset, val, bytes); |
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} |
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|
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static int rv3028_nvram_read(void *priv, unsigned int offset, void *val, |
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size_t bytes) |
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{ |
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return regmap_bulk_read(priv, RV3028_RAM1 + offset, val, bytes); |
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} |
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|
|
static int rv3028_eeprom_write(void *priv, unsigned int offset, void *val, |
|
size_t bytes) |
|
{ |
|
struct rv3028_data *rv3028 = priv; |
|
u32 status, eerd; |
|
int i, ret; |
|
u8 *buf = val; |
|
|
|
ret = rv3028_enter_eerd(rv3028, &eerd); |
|
if (ret) |
|
return ret; |
|
|
|
for (i = 0; i < bytes; i++) { |
|
ret = regmap_write(rv3028->regmap, RV3028_EEPROM_ADDR, offset + i); |
|
if (ret) |
|
goto restore_eerd; |
|
|
|
ret = regmap_write(rv3028->regmap, RV3028_EEPROM_DATA, buf[i]); |
|
if (ret) |
|
goto restore_eerd; |
|
|
|
ret = regmap_write(rv3028->regmap, RV3028_EEPROM_CMD, 0x0); |
|
if (ret) |
|
goto restore_eerd; |
|
|
|
ret = regmap_write(rv3028->regmap, 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(rv3028->regmap, RV3028_STATUS, status, |
|
!(status & RV3028_STATUS_EEBUSY), |
|
RV3028_EEBUSY_POLL, |
|
RV3028_EEBUSY_TIMEOUT); |
|
if (ret) |
|
goto restore_eerd; |
|
} |
|
|
|
restore_eerd: |
|
rv3028_exit_eerd(rv3028, eerd); |
|
|
|
return ret; |
|
} |
|
|
|
static int rv3028_eeprom_read(void *priv, unsigned int offset, void *val, |
|
size_t bytes) |
|
{ |
|
struct rv3028_data *rv3028 = priv; |
|
u32 status, eerd, data; |
|
int i, ret; |
|
u8 *buf = val; |
|
|
|
ret = rv3028_enter_eerd(rv3028, &eerd); |
|
if (ret) |
|
return ret; |
|
|
|
for (i = 0; i < bytes; i++) { |
|
ret = regmap_write(rv3028->regmap, RV3028_EEPROM_ADDR, offset + i); |
|
if (ret) |
|
goto restore_eerd; |
|
|
|
ret = regmap_write(rv3028->regmap, RV3028_EEPROM_CMD, 0x0); |
|
if (ret) |
|
goto restore_eerd; |
|
|
|
ret = regmap_write(rv3028->regmap, RV3028_EEPROM_CMD, |
|
RV3028_EEPROM_CMD_READ); |
|
if (ret) |
|
goto restore_eerd; |
|
|
|
ret = regmap_read_poll_timeout(rv3028->regmap, RV3028_STATUS, status, |
|
!(status & RV3028_STATUS_EEBUSY), |
|
RV3028_EEBUSY_POLL, |
|
RV3028_EEBUSY_TIMEOUT); |
|
if (ret) |
|
goto restore_eerd; |
|
|
|
ret = regmap_read(rv3028->regmap, RV3028_EEPROM_DATA, &data); |
|
if (ret) |
|
goto restore_eerd; |
|
buf[i] = data; |
|
} |
|
|
|
restore_eerd: |
|
rv3028_exit_eerd(rv3028, eerd); |
|
|
|
return ret; |
|
} |
|
|
|
#ifdef CONFIG_COMMON_CLK |
|
#define clkout_hw_to_rv3028(hw) container_of(hw, struct rv3028_data, clkout_hw) |
|
|
|
static int clkout_rates[] = { |
|
32768, |
|
8192, |
|
1024, |
|
64, |
|
32, |
|
1, |
|
}; |
|
|
|
static unsigned long rv3028_clkout_recalc_rate(struct clk_hw *hw, |
|
unsigned long parent_rate) |
|
{ |
|
int clkout, ret; |
|
struct rv3028_data *rv3028 = clkout_hw_to_rv3028(hw); |
|
|
|
ret = regmap_read(rv3028->regmap, RV3028_CLKOUT, &clkout); |
|
if (ret < 0) |
|
return 0; |
|
|
|
clkout &= RV3028_CLKOUT_FD_MASK; |
|
return clkout_rates[clkout]; |
|
} |
|
|
|
static long rv3028_clkout_round_rate(struct clk_hw *hw, unsigned long rate, |
|
unsigned long *prate) |
|
{ |
|
int i; |
|
|
|
for (i = 0; i < ARRAY_SIZE(clkout_rates); i++) |
|
if (clkout_rates[i] <= rate) |
|
return clkout_rates[i]; |
|
|
|
return 0; |
|
} |
|
|
|
static int rv3028_clkout_set_rate(struct clk_hw *hw, unsigned long rate, |
|
unsigned long parent_rate) |
|
{ |
|
int i, ret; |
|
u32 enabled; |
|
struct rv3028_data *rv3028 = clkout_hw_to_rv3028(hw); |
|
|
|
ret = regmap_read(rv3028->regmap, RV3028_CLKOUT, &enabled); |
|
if (ret < 0) |
|
return ret; |
|
|
|
ret = regmap_write(rv3028->regmap, RV3028_CLKOUT, 0x0); |
|
if (ret < 0) |
|
return ret; |
|
|
|
enabled &= RV3028_CLKOUT_CLKOE; |
|
|
|
for (i = 0; i < ARRAY_SIZE(clkout_rates); i++) |
|
if (clkout_rates[i] == rate) |
|
return rv3028_update_cfg(rv3028, RV3028_CLKOUT, 0xff, |
|
RV3028_CLKOUT_CLKSY | enabled | i); |
|
|
|
return -EINVAL; |
|
} |
|
|
|
static int rv3028_clkout_prepare(struct clk_hw *hw) |
|
{ |
|
struct rv3028_data *rv3028 = clkout_hw_to_rv3028(hw); |
|
|
|
return regmap_write(rv3028->regmap, RV3028_CLKOUT, |
|
RV3028_CLKOUT_CLKSY | RV3028_CLKOUT_CLKOE); |
|
} |
|
|
|
static void rv3028_clkout_unprepare(struct clk_hw *hw) |
|
{ |
|
struct rv3028_data *rv3028 = clkout_hw_to_rv3028(hw); |
|
|
|
regmap_write(rv3028->regmap, RV3028_CLKOUT, 0x0); |
|
regmap_update_bits(rv3028->regmap, RV3028_STATUS, |
|
RV3028_STATUS_CLKF, 0); |
|
} |
|
|
|
static int rv3028_clkout_is_prepared(struct clk_hw *hw) |
|
{ |
|
int clkout, ret; |
|
struct rv3028_data *rv3028 = clkout_hw_to_rv3028(hw); |
|
|
|
ret = regmap_read(rv3028->regmap, RV3028_CLKOUT, &clkout); |
|
if (ret < 0) |
|
return ret; |
|
|
|
return !!(clkout & RV3028_CLKOUT_CLKOE); |
|
} |
|
|
|
static const struct clk_ops rv3028_clkout_ops = { |
|
.prepare = rv3028_clkout_prepare, |
|
.unprepare = rv3028_clkout_unprepare, |
|
.is_prepared = rv3028_clkout_is_prepared, |
|
.recalc_rate = rv3028_clkout_recalc_rate, |
|
.round_rate = rv3028_clkout_round_rate, |
|
.set_rate = rv3028_clkout_set_rate, |
|
}; |
|
|
|
static int rv3028_clkout_register_clk(struct rv3028_data *rv3028, |
|
struct i2c_client *client) |
|
{ |
|
int ret; |
|
struct clk *clk; |
|
struct clk_init_data init; |
|
struct device_node *node = client->dev.of_node; |
|
|
|
ret = regmap_update_bits(rv3028->regmap, RV3028_STATUS, |
|
RV3028_STATUS_CLKF, 0); |
|
if (ret < 0) |
|
return ret; |
|
|
|
init.name = "rv3028-clkout"; |
|
init.ops = &rv3028_clkout_ops; |
|
init.flags = 0; |
|
init.parent_names = NULL; |
|
init.num_parents = 0; |
|
rv3028->clkout_hw.init = &init; |
|
|
|
/* optional override of the clockname */ |
|
of_property_read_string(node, "clock-output-names", &init.name); |
|
|
|
/* register the clock */ |
|
clk = devm_clk_register(&client->dev, &rv3028->clkout_hw); |
|
if (!IS_ERR(clk)) |
|
of_clk_add_provider(node, of_clk_src_simple_get, clk); |
|
|
|
return 0; |
|
} |
|
#endif |
|
|
|
static const struct rtc_class_ops rv3028_rtc_ops = { |
|
.read_time = rv3028_get_time, |
|
.set_time = rv3028_set_time, |
|
.read_alarm = rv3028_get_alarm, |
|
.set_alarm = rv3028_set_alarm, |
|
.alarm_irq_enable = rv3028_alarm_irq_enable, |
|
.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; |
|
u8 bsm; |
|
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); |
|
if (IS_ERR(rv3028->regmap)) |
|
return PTR_ERR(rv3028->regmap); |
|
|
|
i2c_set_clientdata(client, rv3028); |
|
|
|
ret = regmap_read(rv3028->regmap, RV3028_STATUS, &status); |
|
if (ret < 0) |
|
return ret; |
|
|
|
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; |
|
} |
|
} |
|
if (!client->irq) |
|
clear_bit(RTC_FEATURE_ALARM, rv3028->rtc->features); |
|
|
|
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 backup switchover mode */ |
|
if (!device_property_read_u8(&client->dev, "backup-switchover-mode", |
|
&bsm)) { |
|
if (bsm <= 3) { |
|
ret = regmap_update_bits(rv3028->regmap, RV3028_BACKUP, |
|
RV3028_BACKUP_BSM_MASK, |
|
(bsm & 0x03) << 2); |
|
|
|
if (ret) |
|
return ret; |
|
} else { |
|
dev_warn(&client->dev, "invalid backup switchover mode value\n"); |
|
} |
|
} |
|
|
|
/* 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 = rv3028_update_cfg(rv3028, 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 = devm_rtc_register_device(rv3028->rtc); |
|
if (ret) |
|
return ret; |
|
|
|
nvmem_cfg.priv = rv3028->regmap; |
|
devm_rtc_nvmem_register(rv3028->rtc, &nvmem_cfg); |
|
eeprom_cfg.priv = rv3028; |
|
devm_rtc_nvmem_register(rv3028->rtc, &eeprom_cfg); |
|
|
|
rv3028->rtc->max_user_freq = 1; |
|
|
|
#ifdef CONFIG_COMMON_CLK |
|
rv3028_clkout_register_clk(rv3028, client); |
|
#endif |
|
return 0; |
|
} |
|
|
|
static const __maybe_unused 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 <[email protected]>"); |
|
MODULE_DESCRIPTION("Micro Crystal RV3028 RTC driver"); |
|
MODULE_LICENSE("GPL v2");
|
|
|