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926 lines
22 KiB
926 lines
22 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* RTC driver for the Micro Crystal RV3032 |
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* |
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* Copyright (C) 2020 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.h> |
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#include <linux/clk-provider.h> |
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#include <linux/bcd.h> |
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#include <linux/bitfield.h> |
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#include <linux/bitops.h> |
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#include <linux/hwmon.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 RV3032_SEC 0x01 |
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#define RV3032_MIN 0x02 |
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#define RV3032_HOUR 0x03 |
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#define RV3032_WDAY 0x04 |
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#define RV3032_DAY 0x05 |
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#define RV3032_MONTH 0x06 |
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#define RV3032_YEAR 0x07 |
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#define RV3032_ALARM_MIN 0x08 |
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#define RV3032_ALARM_HOUR 0x09 |
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#define RV3032_ALARM_DAY 0x0A |
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#define RV3032_STATUS 0x0D |
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#define RV3032_TLSB 0x0E |
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#define RV3032_TMSB 0x0F |
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#define RV3032_CTRL1 0x10 |
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#define RV3032_CTRL2 0x11 |
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#define RV3032_CTRL3 0x12 |
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#define RV3032_TS_CTRL 0x13 |
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#define RV3032_CLK_IRQ 0x14 |
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#define RV3032_EEPROM_ADDR 0x3D |
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#define RV3032_EEPROM_DATA 0x3E |
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#define RV3032_EEPROM_CMD 0x3F |
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#define RV3032_RAM1 0x40 |
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#define RV3032_PMU 0xC0 |
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#define RV3032_OFFSET 0xC1 |
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#define RV3032_CLKOUT1 0xC2 |
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#define RV3032_CLKOUT2 0xC3 |
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#define RV3032_TREF0 0xC4 |
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#define RV3032_TREF1 0xC5 |
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#define RV3032_STATUS_VLF BIT(0) |
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#define RV3032_STATUS_PORF BIT(1) |
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#define RV3032_STATUS_EVF BIT(2) |
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#define RV3032_STATUS_AF BIT(3) |
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#define RV3032_STATUS_TF BIT(4) |
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#define RV3032_STATUS_UF BIT(5) |
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#define RV3032_STATUS_TLF BIT(6) |
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#define RV3032_STATUS_THF BIT(7) |
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#define RV3032_TLSB_CLKF BIT(1) |
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#define RV3032_TLSB_EEBUSY BIT(2) |
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#define RV3032_TLSB_TEMP GENMASK(7, 4) |
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#define RV3032_CLKOUT2_HFD_MSK GENMASK(4, 0) |
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#define RV3032_CLKOUT2_FD_MSK GENMASK(6, 5) |
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#define RV3032_CLKOUT2_OS BIT(7) |
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#define RV3032_CTRL1_EERD BIT(3) |
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#define RV3032_CTRL1_WADA BIT(5) |
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#define RV3032_CTRL2_STOP BIT(0) |
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#define RV3032_CTRL2_EIE BIT(2) |
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#define RV3032_CTRL2_AIE BIT(3) |
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#define RV3032_CTRL2_TIE BIT(4) |
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#define RV3032_CTRL2_UIE BIT(5) |
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#define RV3032_CTRL2_CLKIE BIT(6) |
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#define RV3032_CTRL2_TSE BIT(7) |
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#define RV3032_PMU_TCM GENMASK(1, 0) |
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#define RV3032_PMU_TCR GENMASK(3, 2) |
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#define RV3032_PMU_BSM GENMASK(5, 4) |
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#define RV3032_PMU_NCLKE BIT(6) |
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#define RV3032_PMU_BSM_DSM 1 |
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#define RV3032_PMU_BSM_LSM 2 |
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#define RV3032_OFFSET_MSK GENMASK(5, 0) |
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#define RV3032_EVT_CTRL_TSR BIT(2) |
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#define RV3032_EEPROM_CMD_UPDATE 0x11 |
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#define RV3032_EEPROM_CMD_WRITE 0x21 |
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#define RV3032_EEPROM_CMD_READ 0x22 |
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#define RV3032_EEPROM_USER 0xCB |
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#define RV3032_EEBUSY_POLL 10000 |
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#define RV3032_EEBUSY_TIMEOUT 100000 |
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#define OFFSET_STEP_PPT 238419 |
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struct rv3032_data { |
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struct regmap *regmap; |
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struct rtc_device *rtc; |
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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 rv3032_trickle_resistors[] = {1000, 2000, 7000, 11000}; |
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static u16 rv3032_trickle_voltages[] = {0, 1750, 3000, 4400}; |
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static int rv3032_exit_eerd(struct rv3032_data *rv3032, 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(rv3032->regmap, RV3032_CTRL1, RV3032_CTRL1_EERD, 0); |
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} |
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static int rv3032_enter_eerd(struct rv3032_data *rv3032, 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(rv3032->regmap, RV3032_CTRL1, &ctrl1); |
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if (ret) |
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return ret; |
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*eerd = ctrl1 & RV3032_CTRL1_EERD; |
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if (*eerd) |
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return 0; |
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ret = regmap_update_bits(rv3032->regmap, RV3032_CTRL1, |
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RV3032_CTRL1_EERD, RV3032_CTRL1_EERD); |
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if (ret) |
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return ret; |
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ret = regmap_read_poll_timeout(rv3032->regmap, RV3032_TLSB, status, |
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!(status & RV3032_TLSB_EEBUSY), |
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RV3032_EEBUSY_POLL, RV3032_EEBUSY_TIMEOUT); |
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if (ret) { |
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rv3032_exit_eerd(rv3032, *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 rv3032_update_cfg(struct rv3032_data *rv3032, unsigned int reg, |
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unsigned int mask, unsigned int val) |
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{ |
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u32 status, eerd; |
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int ret; |
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ret = rv3032_enter_eerd(rv3032, &eerd); |
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if (ret) |
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return ret; |
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ret = regmap_update_bits(rv3032->regmap, reg, mask, val); |
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if (ret) |
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goto exit_eerd; |
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ret = regmap_write(rv3032->regmap, RV3032_EEPROM_CMD, RV3032_EEPROM_CMD_UPDATE); |
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if (ret) |
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goto exit_eerd; |
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usleep_range(46000, RV3032_EEBUSY_TIMEOUT); |
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ret = regmap_read_poll_timeout(rv3032->regmap, RV3032_TLSB, status, |
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!(status & RV3032_TLSB_EEBUSY), |
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RV3032_EEBUSY_POLL, RV3032_EEBUSY_TIMEOUT); |
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exit_eerd: |
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rv3032_exit_eerd(rv3032, eerd); |
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return ret; |
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} |
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static irqreturn_t rv3032_handle_irq(int irq, void *dev_id) |
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{ |
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struct rv3032_data *rv3032 = 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(rv3032->regmap, RV3032_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 & RV3032_STATUS_TF) { |
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status |= RV3032_STATUS_TF; |
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ctrl |= RV3032_CTRL2_TIE; |
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events |= RTC_PF; |
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} |
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if (status & RV3032_STATUS_AF) { |
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status |= RV3032_STATUS_AF; |
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ctrl |= RV3032_CTRL2_AIE; |
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events |= RTC_AF; |
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} |
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if (status & RV3032_STATUS_UF) { |
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status |= RV3032_STATUS_UF; |
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ctrl |= RV3032_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(rv3032->rtc, 1, events); |
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regmap_update_bits(rv3032->regmap, RV3032_STATUS, status, 0); |
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regmap_update_bits(rv3032->regmap, RV3032_CTRL2, ctrl, 0); |
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} |
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return IRQ_HANDLED; |
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} |
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static int rv3032_get_time(struct device *dev, struct rtc_time *tm) |
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{ |
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struct rv3032_data *rv3032 = 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(rv3032->regmap, RV3032_STATUS, &status); |
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if (ret < 0) |
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return ret; |
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if (status & (RV3032_STATUS_PORF | RV3032_STATUS_VLF)) |
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return -EINVAL; |
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ret = regmap_bulk_read(rv3032->regmap, RV3032_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[0] & 0x7f); |
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tm->tm_min = bcd2bin(date[1] & 0x7f); |
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tm->tm_hour = bcd2bin(date[2] & 0x3f); |
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tm->tm_wday = date[3] & 0x7; |
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tm->tm_mday = bcd2bin(date[4] & 0x3f); |
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tm->tm_mon = bcd2bin(date[5] & 0x1f) - 1; |
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tm->tm_year = bcd2bin(date[6]) + 100; |
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return 0; |
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} |
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static int rv3032_set_time(struct device *dev, struct rtc_time *tm) |
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{ |
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struct rv3032_data *rv3032 = dev_get_drvdata(dev); |
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u8 date[7]; |
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int ret; |
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date[0] = bin2bcd(tm->tm_sec); |
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date[1] = bin2bcd(tm->tm_min); |
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date[2] = bin2bcd(tm->tm_hour); |
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date[3] = tm->tm_wday; |
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date[4] = bin2bcd(tm->tm_mday); |
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date[5] = bin2bcd(tm->tm_mon + 1); |
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date[6] = bin2bcd(tm->tm_year - 100); |
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ret = regmap_bulk_write(rv3032->regmap, RV3032_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(rv3032->regmap, RV3032_STATUS, |
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RV3032_STATUS_PORF | RV3032_STATUS_VLF, 0); |
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return ret; |
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} |
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static int rv3032_get_alarm(struct device *dev, struct rtc_wkalrm *alrm) |
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{ |
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struct rv3032_data *rv3032 = 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(rv3032->regmap, RV3032_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(rv3032->regmap, RV3032_STATUS, &status); |
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if (ret < 0) |
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return ret; |
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ret = regmap_read(rv3032->regmap, RV3032_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 & RV3032_CTRL2_AIE); |
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alrm->pending = (status & RV3032_STATUS_AF) && alrm->enabled; |
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return 0; |
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} |
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static int rv3032_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) |
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{ |
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struct rv3032_data *rv3032 = 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(rv3032->regmap, RV3032_CTRL2, |
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RV3032_CTRL2_AIE | RV3032_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(rv3032->regmap, RV3032_STATUS, |
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RV3032_STATUS_AF, 0); |
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if (ret) |
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return ret; |
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ret = regmap_bulk_write(rv3032->regmap, RV3032_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 (rv3032->rtc->uie_rtctimer.enabled) |
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ctrl |= RV3032_CTRL2_UIE; |
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if (rv3032->rtc->aie_timer.enabled) |
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ctrl |= RV3032_CTRL2_AIE; |
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} |
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ret = regmap_update_bits(rv3032->regmap, RV3032_CTRL2, |
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RV3032_CTRL2_UIE | RV3032_CTRL2_AIE, ctrl); |
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return ret; |
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} |
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static int rv3032_alarm_irq_enable(struct device *dev, unsigned int enabled) |
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{ |
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struct rv3032_data *rv3032 = dev_get_drvdata(dev); |
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int ctrl = 0, ret; |
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if (enabled) { |
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if (rv3032->rtc->uie_rtctimer.enabled) |
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ctrl |= RV3032_CTRL2_UIE; |
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if (rv3032->rtc->aie_timer.enabled) |
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ctrl |= RV3032_CTRL2_AIE; |
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} |
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ret = regmap_update_bits(rv3032->regmap, RV3032_STATUS, |
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RV3032_STATUS_AF | RV3032_STATUS_UF, 0); |
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if (ret) |
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return ret; |
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ret = regmap_update_bits(rv3032->regmap, RV3032_CTRL2, |
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RV3032_CTRL2_UIE | RV3032_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 rv3032_read_offset(struct device *dev, long *offset) |
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{ |
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struct rv3032_data *rv3032 = dev_get_drvdata(dev); |
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int ret, value, steps; |
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ret = regmap_read(rv3032->regmap, RV3032_OFFSET, &value); |
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if (ret < 0) |
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return ret; |
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steps = sign_extend32(FIELD_GET(RV3032_OFFSET_MSK, value), 5); |
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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 rv3032_set_offset(struct device *dev, long offset) |
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{ |
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struct rv3032_data *rv3032 = dev_get_drvdata(dev); |
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offset = clamp(offset, -7629L, 7391L) * 1000; |
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offset = DIV_ROUND_CLOSEST(offset, OFFSET_STEP_PPT); |
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return rv3032_update_cfg(rv3032, RV3032_OFFSET, RV3032_OFFSET_MSK, |
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FIELD_PREP(RV3032_OFFSET_MSK, offset)); |
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} |
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static int rv3032_ioctl(struct device *dev, unsigned int cmd, unsigned long arg) |
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{ |
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struct rv3032_data *rv3032 = dev_get_drvdata(dev); |
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int status, val = 0, ret = 0; |
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switch (cmd) { |
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case RTC_VL_READ: |
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ret = regmap_read(rv3032->regmap, RV3032_STATUS, &status); |
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if (ret < 0) |
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return ret; |
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if (status & (RV3032_STATUS_PORF | RV3032_STATUS_VLF)) |
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val = RTC_VL_DATA_INVALID; |
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return put_user(val, (unsigned int __user *)arg); |
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default: |
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return -ENOIOCTLCMD; |
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} |
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} |
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static int rv3032_nvram_write(void *priv, unsigned int offset, void *val, size_t bytes) |
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{ |
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return regmap_bulk_write(priv, RV3032_RAM1 + offset, val, bytes); |
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} |
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static int rv3032_nvram_read(void *priv, unsigned int offset, void *val, size_t bytes) |
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{ |
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return regmap_bulk_read(priv, RV3032_RAM1 + offset, val, bytes); |
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} |
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static int rv3032_eeprom_write(void *priv, unsigned int offset, void *val, size_t bytes) |
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{ |
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struct rv3032_data *rv3032 = priv; |
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u32 status, eerd; |
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int i, ret; |
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u8 *buf = val; |
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ret = rv3032_enter_eerd(rv3032, &eerd); |
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if (ret) |
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return ret; |
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for (i = 0; i < bytes; i++) { |
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ret = regmap_write(rv3032->regmap, RV3032_EEPROM_ADDR, |
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RV3032_EEPROM_USER + offset + i); |
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if (ret) |
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goto exit_eerd; |
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ret = regmap_write(rv3032->regmap, RV3032_EEPROM_DATA, buf[i]); |
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if (ret) |
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goto exit_eerd; |
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ret = regmap_write(rv3032->regmap, RV3032_EEPROM_CMD, |
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RV3032_EEPROM_CMD_WRITE); |
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if (ret) |
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goto exit_eerd; |
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usleep_range(RV3032_EEBUSY_POLL, RV3032_EEBUSY_TIMEOUT); |
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ret = regmap_read_poll_timeout(rv3032->regmap, RV3032_TLSB, status, |
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!(status & RV3032_TLSB_EEBUSY), |
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RV3032_EEBUSY_POLL, RV3032_EEBUSY_TIMEOUT); |
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if (ret) |
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goto exit_eerd; |
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} |
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exit_eerd: |
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rv3032_exit_eerd(rv3032, eerd); |
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return ret; |
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} |
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static int rv3032_eeprom_read(void *priv, unsigned int offset, void *val, size_t bytes) |
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{ |
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struct rv3032_data *rv3032 = priv; |
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u32 status, eerd, data; |
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int i, ret; |
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u8 *buf = val; |
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ret = rv3032_enter_eerd(rv3032, &eerd); |
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if (ret) |
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return ret; |
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for (i = 0; i < bytes; i++) { |
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ret = regmap_write(rv3032->regmap, RV3032_EEPROM_ADDR, |
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RV3032_EEPROM_USER + offset + i); |
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if (ret) |
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goto exit_eerd; |
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ret = regmap_write(rv3032->regmap, RV3032_EEPROM_CMD, |
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RV3032_EEPROM_CMD_READ); |
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if (ret) |
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goto exit_eerd; |
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ret = regmap_read_poll_timeout(rv3032->regmap, RV3032_TLSB, status, |
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!(status & RV3032_TLSB_EEBUSY), |
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RV3032_EEBUSY_POLL, RV3032_EEBUSY_TIMEOUT); |
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if (ret) |
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goto exit_eerd; |
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ret = regmap_read(rv3032->regmap, RV3032_EEPROM_DATA, &data); |
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if (ret) |
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goto exit_eerd; |
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buf[i] = data; |
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} |
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exit_eerd: |
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rv3032_exit_eerd(rv3032, eerd); |
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return ret; |
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} |
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static int rv3032_trickle_charger_setup(struct device *dev, struct rv3032_data *rv3032) |
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{ |
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u32 val, ohms, voltage; |
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int i; |
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|
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val = FIELD_PREP(RV3032_PMU_TCM, 1) | FIELD_PREP(RV3032_PMU_BSM, RV3032_PMU_BSM_DSM); |
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if (!device_property_read_u32(dev, "trickle-voltage-millivolt", &voltage)) { |
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for (i = 0; i < ARRAY_SIZE(rv3032_trickle_voltages); i++) |
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if (voltage == rv3032_trickle_voltages[i]) |
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break; |
|
if (i < ARRAY_SIZE(rv3032_trickle_voltages)) |
|
val = FIELD_PREP(RV3032_PMU_TCM, i) | |
|
FIELD_PREP(RV3032_PMU_BSM, RV3032_PMU_BSM_LSM); |
|
} |
|
|
|
if (device_property_read_u32(dev, "trickle-resistor-ohms", &ohms)) |
|
return 0; |
|
|
|
for (i = 0; i < ARRAY_SIZE(rv3032_trickle_resistors); i++) |
|
if (ohms == rv3032_trickle_resistors[i]) |
|
break; |
|
|
|
if (i >= ARRAY_SIZE(rv3032_trickle_resistors)) { |
|
dev_warn(dev, "invalid trickle resistor value\n"); |
|
|
|
return 0; |
|
} |
|
|
|
return rv3032_update_cfg(rv3032, RV3032_PMU, |
|
RV3032_PMU_TCR | RV3032_PMU_TCM | RV3032_PMU_BSM, |
|
val | FIELD_PREP(RV3032_PMU_TCR, i)); |
|
} |
|
|
|
#ifdef CONFIG_COMMON_CLK |
|
#define clkout_hw_to_rv3032(hw) container_of(hw, struct rv3032_data, clkout_hw) |
|
|
|
static int clkout_xtal_rates[] = { |
|
32768, |
|
1024, |
|
64, |
|
1, |
|
}; |
|
|
|
#define RV3032_HFD_STEP 8192 |
|
|
|
static unsigned long rv3032_clkout_recalc_rate(struct clk_hw *hw, |
|
unsigned long parent_rate) |
|
{ |
|
int clkout, ret; |
|
struct rv3032_data *rv3032 = clkout_hw_to_rv3032(hw); |
|
|
|
ret = regmap_read(rv3032->regmap, RV3032_CLKOUT2, &clkout); |
|
if (ret < 0) |
|
return 0; |
|
|
|
if (clkout & RV3032_CLKOUT2_OS) { |
|
unsigned long rate = FIELD_GET(RV3032_CLKOUT2_HFD_MSK, clkout) << 8; |
|
|
|
ret = regmap_read(rv3032->regmap, RV3032_CLKOUT1, &clkout); |
|
if (ret < 0) |
|
return 0; |
|
|
|
rate += clkout + 1; |
|
|
|
return rate * RV3032_HFD_STEP; |
|
} |
|
|
|
return clkout_xtal_rates[FIELD_GET(RV3032_CLKOUT2_FD_MSK, clkout)]; |
|
} |
|
|
|
static long rv3032_clkout_round_rate(struct clk_hw *hw, unsigned long rate, |
|
unsigned long *prate) |
|
{ |
|
int i, hfd; |
|
|
|
if (rate < RV3032_HFD_STEP) |
|
for (i = 0; i < ARRAY_SIZE(clkout_xtal_rates); i++) |
|
if (clkout_xtal_rates[i] <= rate) |
|
return clkout_xtal_rates[i]; |
|
|
|
hfd = DIV_ROUND_CLOSEST(rate, RV3032_HFD_STEP); |
|
|
|
return RV3032_HFD_STEP * clamp(hfd, 0, 8192); |
|
} |
|
|
|
static int rv3032_clkout_set_rate(struct clk_hw *hw, unsigned long rate, |
|
unsigned long parent_rate) |
|
{ |
|
struct rv3032_data *rv3032 = clkout_hw_to_rv3032(hw); |
|
u32 status, eerd; |
|
int i, hfd, ret; |
|
|
|
for (i = 0; i < ARRAY_SIZE(clkout_xtal_rates); i++) { |
|
if (clkout_xtal_rates[i] == rate) { |
|
return rv3032_update_cfg(rv3032, RV3032_CLKOUT2, 0xff, |
|
FIELD_PREP(RV3032_CLKOUT2_FD_MSK, i)); |
|
} |
|
} |
|
|
|
hfd = DIV_ROUND_CLOSEST(rate, RV3032_HFD_STEP); |
|
hfd = clamp(hfd, 1, 8192) - 1; |
|
|
|
ret = rv3032_enter_eerd(rv3032, &eerd); |
|
if (ret) |
|
goto exit_eerd; |
|
|
|
ret = regmap_write(rv3032->regmap, RV3032_CLKOUT1, hfd & 0xff); |
|
if (ret) |
|
return ret; |
|
|
|
ret = regmap_write(rv3032->regmap, RV3032_CLKOUT2, RV3032_CLKOUT2_OS | |
|
FIELD_PREP(RV3032_CLKOUT2_HFD_MSK, hfd >> 8)); |
|
if (ret) |
|
goto exit_eerd; |
|
|
|
ret = regmap_write(rv3032->regmap, RV3032_EEPROM_CMD, RV3032_EEPROM_CMD_UPDATE); |
|
if (ret) |
|
goto exit_eerd; |
|
|
|
usleep_range(46000, RV3032_EEBUSY_TIMEOUT); |
|
|
|
ret = regmap_read_poll_timeout(rv3032->regmap, RV3032_TLSB, status, |
|
!(status & RV3032_TLSB_EEBUSY), |
|
RV3032_EEBUSY_POLL, RV3032_EEBUSY_TIMEOUT); |
|
|
|
exit_eerd: |
|
rv3032_exit_eerd(rv3032, eerd); |
|
|
|
return ret; |
|
} |
|
|
|
static int rv3032_clkout_prepare(struct clk_hw *hw) |
|
{ |
|
struct rv3032_data *rv3032 = clkout_hw_to_rv3032(hw); |
|
|
|
return rv3032_update_cfg(rv3032, RV3032_PMU, RV3032_PMU_NCLKE, 0); |
|
} |
|
|
|
static void rv3032_clkout_unprepare(struct clk_hw *hw) |
|
{ |
|
struct rv3032_data *rv3032 = clkout_hw_to_rv3032(hw); |
|
|
|
rv3032_update_cfg(rv3032, RV3032_PMU, RV3032_PMU_NCLKE, RV3032_PMU_NCLKE); |
|
} |
|
|
|
static int rv3032_clkout_is_prepared(struct clk_hw *hw) |
|
{ |
|
int val, ret; |
|
struct rv3032_data *rv3032 = clkout_hw_to_rv3032(hw); |
|
|
|
ret = regmap_read(rv3032->regmap, RV3032_PMU, &val); |
|
if (ret < 0) |
|
return ret; |
|
|
|
return !(val & RV3032_PMU_NCLKE); |
|
} |
|
|
|
static const struct clk_ops rv3032_clkout_ops = { |
|
.prepare = rv3032_clkout_prepare, |
|
.unprepare = rv3032_clkout_unprepare, |
|
.is_prepared = rv3032_clkout_is_prepared, |
|
.recalc_rate = rv3032_clkout_recalc_rate, |
|
.round_rate = rv3032_clkout_round_rate, |
|
.set_rate = rv3032_clkout_set_rate, |
|
}; |
|
|
|
static int rv3032_clkout_register_clk(struct rv3032_data *rv3032, |
|
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(rv3032->regmap, RV3032_TLSB, RV3032_TLSB_CLKF, 0); |
|
if (ret < 0) |
|
return ret; |
|
|
|
ret = regmap_update_bits(rv3032->regmap, RV3032_CTRL2, RV3032_CTRL2_CLKIE, 0); |
|
if (ret < 0) |
|
return ret; |
|
|
|
ret = regmap_write(rv3032->regmap, RV3032_CLK_IRQ, 0); |
|
if (ret < 0) |
|
return ret; |
|
|
|
init.name = "rv3032-clkout"; |
|
init.ops = &rv3032_clkout_ops; |
|
init.flags = 0; |
|
init.parent_names = NULL; |
|
init.num_parents = 0; |
|
rv3032->clkout_hw.init = &init; |
|
|
|
of_property_read_string(node, "clock-output-names", &init.name); |
|
|
|
clk = devm_clk_register(&client->dev, &rv3032->clkout_hw); |
|
if (!IS_ERR(clk)) |
|
of_clk_add_provider(node, of_clk_src_simple_get, clk); |
|
|
|
return 0; |
|
} |
|
#endif |
|
|
|
static int rv3032_hwmon_read_temp(struct device *dev, long *mC) |
|
{ |
|
struct rv3032_data *rv3032 = dev_get_drvdata(dev); |
|
u8 buf[2]; |
|
int temp, prev = 0; |
|
int ret; |
|
|
|
ret = regmap_bulk_read(rv3032->regmap, RV3032_TLSB, buf, sizeof(buf)); |
|
if (ret) |
|
return ret; |
|
|
|
temp = sign_extend32(buf[1], 7) << 4; |
|
temp |= FIELD_GET(RV3032_TLSB_TEMP, buf[0]); |
|
|
|
/* No blocking or shadowing on RV3032_TLSB and RV3032_TMSB */ |
|
do { |
|
prev = temp; |
|
|
|
ret = regmap_bulk_read(rv3032->regmap, RV3032_TLSB, buf, sizeof(buf)); |
|
if (ret) |
|
return ret; |
|
|
|
temp = sign_extend32(buf[1], 7) << 4; |
|
temp |= FIELD_GET(RV3032_TLSB_TEMP, buf[0]); |
|
} while (temp != prev); |
|
|
|
*mC = (temp * 1000) / 16; |
|
|
|
return 0; |
|
} |
|
|
|
static umode_t rv3032_hwmon_is_visible(const void *data, enum hwmon_sensor_types type, |
|
u32 attr, int channel) |
|
{ |
|
if (type != hwmon_temp) |
|
return 0; |
|
|
|
switch (attr) { |
|
case hwmon_temp_input: |
|
return 0444; |
|
default: |
|
return 0; |
|
} |
|
} |
|
|
|
static int rv3032_hwmon_read(struct device *dev, enum hwmon_sensor_types type, |
|
u32 attr, int channel, long *temp) |
|
{ |
|
int err; |
|
|
|
switch (attr) { |
|
case hwmon_temp_input: |
|
err = rv3032_hwmon_read_temp(dev, temp); |
|
break; |
|
default: |
|
err = -EOPNOTSUPP; |
|
break; |
|
} |
|
|
|
return err; |
|
} |
|
|
|
static const struct hwmon_channel_info *rv3032_hwmon_info[] = { |
|
HWMON_CHANNEL_INFO(chip, HWMON_C_REGISTER_TZ), |
|
HWMON_CHANNEL_INFO(temp, HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MAX_HYST), |
|
NULL |
|
}; |
|
|
|
static const struct hwmon_ops rv3032_hwmon_hwmon_ops = { |
|
.is_visible = rv3032_hwmon_is_visible, |
|
.read = rv3032_hwmon_read, |
|
}; |
|
|
|
static const struct hwmon_chip_info rv3032_hwmon_chip_info = { |
|
.ops = &rv3032_hwmon_hwmon_ops, |
|
.info = rv3032_hwmon_info, |
|
}; |
|
|
|
static void rv3032_hwmon_register(struct device *dev) |
|
{ |
|
struct rv3032_data *rv3032 = dev_get_drvdata(dev); |
|
|
|
if (!IS_REACHABLE(CONFIG_HWMON)) |
|
return; |
|
|
|
devm_hwmon_device_register_with_info(dev, "rv3032", rv3032, &rv3032_hwmon_chip_info, NULL); |
|
} |
|
|
|
static const struct rtc_class_ops rv3032_rtc_ops = { |
|
.read_time = rv3032_get_time, |
|
.set_time = rv3032_set_time, |
|
.read_offset = rv3032_read_offset, |
|
.set_offset = rv3032_set_offset, |
|
.ioctl = rv3032_ioctl, |
|
.read_alarm = rv3032_get_alarm, |
|
.set_alarm = rv3032_set_alarm, |
|
.alarm_irq_enable = rv3032_alarm_irq_enable, |
|
}; |
|
|
|
static const struct regmap_config regmap_config = { |
|
.reg_bits = 8, |
|
.val_bits = 8, |
|
.max_register = 0xCA, |
|
}; |
|
|
|
static int rv3032_probe(struct i2c_client *client) |
|
{ |
|
struct rv3032_data *rv3032; |
|
int ret, status; |
|
struct nvmem_config nvmem_cfg = { |
|
.name = "rv3032_nvram", |
|
.word_size = 1, |
|
.stride = 1, |
|
.size = 16, |
|
.type = NVMEM_TYPE_BATTERY_BACKED, |
|
.reg_read = rv3032_nvram_read, |
|
.reg_write = rv3032_nvram_write, |
|
}; |
|
struct nvmem_config eeprom_cfg = { |
|
.name = "rv3032_eeprom", |
|
.word_size = 1, |
|
.stride = 1, |
|
.size = 32, |
|
.type = NVMEM_TYPE_EEPROM, |
|
.reg_read = rv3032_eeprom_read, |
|
.reg_write = rv3032_eeprom_write, |
|
}; |
|
|
|
rv3032 = devm_kzalloc(&client->dev, sizeof(struct rv3032_data), |
|
GFP_KERNEL); |
|
if (!rv3032) |
|
return -ENOMEM; |
|
|
|
rv3032->regmap = devm_regmap_init_i2c(client, ®map_config); |
|
if (IS_ERR(rv3032->regmap)) |
|
return PTR_ERR(rv3032->regmap); |
|
|
|
i2c_set_clientdata(client, rv3032); |
|
|
|
ret = regmap_read(rv3032->regmap, RV3032_STATUS, &status); |
|
if (ret < 0) |
|
return ret; |
|
|
|
rv3032->rtc = devm_rtc_allocate_device(&client->dev); |
|
if (IS_ERR(rv3032->rtc)) |
|
return PTR_ERR(rv3032->rtc); |
|
|
|
if (client->irq > 0) { |
|
ret = devm_request_threaded_irq(&client->dev, client->irq, |
|
NULL, rv3032_handle_irq, |
|
IRQF_TRIGGER_LOW | IRQF_ONESHOT, |
|
"rv3032", rv3032); |
|
if (ret) { |
|
dev_warn(&client->dev, "unable to request IRQ, alarms disabled\n"); |
|
client->irq = 0; |
|
} |
|
} |
|
if (!client->irq) |
|
clear_bit(RTC_FEATURE_ALARM, rv3032->rtc->features); |
|
|
|
ret = regmap_update_bits(rv3032->regmap, RV3032_CTRL1, |
|
RV3032_CTRL1_WADA, RV3032_CTRL1_WADA); |
|
if (ret) |
|
return ret; |
|
|
|
rv3032_trickle_charger_setup(&client->dev, rv3032); |
|
|
|
rv3032->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000; |
|
rv3032->rtc->range_max = RTC_TIMESTAMP_END_2099; |
|
rv3032->rtc->ops = &rv3032_rtc_ops; |
|
ret = devm_rtc_register_device(rv3032->rtc); |
|
if (ret) |
|
return ret; |
|
|
|
nvmem_cfg.priv = rv3032->regmap; |
|
devm_rtc_nvmem_register(rv3032->rtc, &nvmem_cfg); |
|
eeprom_cfg.priv = rv3032; |
|
devm_rtc_nvmem_register(rv3032->rtc, &eeprom_cfg); |
|
|
|
rv3032->rtc->max_user_freq = 1; |
|
|
|
#ifdef CONFIG_COMMON_CLK |
|
rv3032_clkout_register_clk(rv3032, client); |
|
#endif |
|
|
|
rv3032_hwmon_register(&client->dev); |
|
|
|
return 0; |
|
} |
|
|
|
static const __maybe_unused struct of_device_id rv3032_of_match[] = { |
|
{ .compatible = "microcrystal,rv3032", }, |
|
{ } |
|
}; |
|
MODULE_DEVICE_TABLE(of, rv3032_of_match); |
|
|
|
static struct i2c_driver rv3032_driver = { |
|
.driver = { |
|
.name = "rtc-rv3032", |
|
.of_match_table = of_match_ptr(rv3032_of_match), |
|
}, |
|
.probe_new = rv3032_probe, |
|
}; |
|
module_i2c_driver(rv3032_driver); |
|
|
|
MODULE_AUTHOR("Alexandre Belloni <[email protected]>"); |
|
MODULE_DESCRIPTION("Micro Crystal RV3032 RTC driver"); |
|
MODULE_LICENSE("GPL v2");
|
|
|