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919 lines
22 KiB
919 lines
22 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Micro Crystal RV-3029 / RV-3049 rtc class driver |
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* |
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* Author: Gregory Hermant <[email protected]> |
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* Michael Buesch <[email protected]> |
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* |
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* based on previously existing rtc class drivers |
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*/ |
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#include <linux/module.h> |
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#include <linux/i2c.h> |
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#include <linux/spi/spi.h> |
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#include <linux/bcd.h> |
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#include <linux/rtc.h> |
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#include <linux/delay.h> |
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#include <linux/of.h> |
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#include <linux/hwmon.h> |
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#include <linux/hwmon-sysfs.h> |
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#include <linux/regmap.h> |
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/* Register map */ |
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/* control section */ |
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#define RV3029_ONOFF_CTRL 0x00 |
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#define RV3029_ONOFF_CTRL_WE BIT(0) |
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#define RV3029_ONOFF_CTRL_TE BIT(1) |
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#define RV3029_ONOFF_CTRL_TAR BIT(2) |
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#define RV3029_ONOFF_CTRL_EERE BIT(3) |
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#define RV3029_ONOFF_CTRL_SRON BIT(4) |
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#define RV3029_ONOFF_CTRL_TD0 BIT(5) |
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#define RV3029_ONOFF_CTRL_TD1 BIT(6) |
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#define RV3029_ONOFF_CTRL_CLKINT BIT(7) |
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#define RV3029_IRQ_CTRL 0x01 |
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#define RV3029_IRQ_CTRL_AIE BIT(0) |
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#define RV3029_IRQ_CTRL_TIE BIT(1) |
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#define RV3029_IRQ_CTRL_V1IE BIT(2) |
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#define RV3029_IRQ_CTRL_V2IE BIT(3) |
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#define RV3029_IRQ_CTRL_SRIE BIT(4) |
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#define RV3029_IRQ_FLAGS 0x02 |
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#define RV3029_IRQ_FLAGS_AF BIT(0) |
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#define RV3029_IRQ_FLAGS_TF BIT(1) |
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#define RV3029_IRQ_FLAGS_V1IF BIT(2) |
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#define RV3029_IRQ_FLAGS_V2IF BIT(3) |
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#define RV3029_IRQ_FLAGS_SRF BIT(4) |
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#define RV3029_STATUS 0x03 |
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#define RV3029_STATUS_VLOW1 BIT(2) |
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#define RV3029_STATUS_VLOW2 BIT(3) |
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#define RV3029_STATUS_SR BIT(4) |
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#define RV3029_STATUS_PON BIT(5) |
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#define RV3029_STATUS_EEBUSY BIT(7) |
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#define RV3029_RST_CTRL 0x04 |
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#define RV3029_RST_CTRL_SYSR BIT(4) |
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#define RV3029_CONTROL_SECTION_LEN 0x05 |
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/* watch section */ |
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#define RV3029_W_SEC 0x08 |
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#define RV3029_W_MINUTES 0x09 |
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#define RV3029_W_HOURS 0x0A |
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#define RV3029_REG_HR_12_24 BIT(6) /* 24h/12h mode */ |
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#define RV3029_REG_HR_PM BIT(5) /* PM/AM bit in 12h mode */ |
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#define RV3029_W_DATE 0x0B |
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#define RV3029_W_DAYS 0x0C |
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#define RV3029_W_MONTHS 0x0D |
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#define RV3029_W_YEARS 0x0E |
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#define RV3029_WATCH_SECTION_LEN 0x07 |
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/* alarm section */ |
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#define RV3029_A_SC 0x10 |
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#define RV3029_A_MN 0x11 |
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#define RV3029_A_HR 0x12 |
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#define RV3029_A_DT 0x13 |
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#define RV3029_A_DW 0x14 |
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#define RV3029_A_MO 0x15 |
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#define RV3029_A_YR 0x16 |
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#define RV3029_A_AE_X BIT(7) |
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#define RV3029_ALARM_SECTION_LEN 0x07 |
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/* timer section */ |
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#define RV3029_TIMER_LOW 0x18 |
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#define RV3029_TIMER_HIGH 0x19 |
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/* temperature section */ |
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#define RV3029_TEMP_PAGE 0x20 |
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/* eeprom data section */ |
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#define RV3029_E2P_EEDATA1 0x28 |
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#define RV3029_E2P_EEDATA2 0x29 |
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#define RV3029_E2PDATA_SECTION_LEN 0x02 |
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/* eeprom control section */ |
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#define RV3029_CONTROL_E2P_EECTRL 0x30 |
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#define RV3029_EECTRL_THP BIT(0) /* temp scan interval */ |
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#define RV3029_EECTRL_THE BIT(1) /* thermometer enable */ |
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#define RV3029_EECTRL_FD0 BIT(2) /* CLKOUT */ |
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#define RV3029_EECTRL_FD1 BIT(3) /* CLKOUT */ |
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#define RV3029_TRICKLE_1K BIT(4) /* 1.5K resistance */ |
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#define RV3029_TRICKLE_5K BIT(5) /* 5K resistance */ |
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#define RV3029_TRICKLE_20K BIT(6) /* 20K resistance */ |
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#define RV3029_TRICKLE_80K BIT(7) /* 80K resistance */ |
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#define RV3029_TRICKLE_MASK (RV3029_TRICKLE_1K |\ |
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RV3029_TRICKLE_5K |\ |
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RV3029_TRICKLE_20K |\ |
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RV3029_TRICKLE_80K) |
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#define RV3029_TRICKLE_SHIFT 4 |
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#define RV3029_CONTROL_E2P_XOFFS 0x31 /* XTAL offset */ |
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#define RV3029_CONTROL_E2P_XOFFS_SIGN BIT(7) /* Sign: 1->pos, 0->neg */ |
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#define RV3029_CONTROL_E2P_QCOEF 0x32 /* XTAL temp drift coef */ |
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#define RV3029_CONTROL_E2P_TURNOVER 0x33 /* XTAL turnover temp (in *C) */ |
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#define RV3029_CONTROL_E2P_TOV_MASK 0x3F /* XTAL turnover temp mask */ |
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/* user ram section */ |
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#define RV3029_RAM_PAGE 0x38 |
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#define RV3029_RAM_SECTION_LEN 8 |
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struct rv3029_data { |
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struct device *dev; |
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struct rtc_device *rtc; |
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struct regmap *regmap; |
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int irq; |
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}; |
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static int rv3029_eeprom_busywait(struct rv3029_data *rv3029) |
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{ |
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unsigned int sr; |
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int i, ret; |
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for (i = 100; i > 0; i--) { |
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ret = regmap_read(rv3029->regmap, RV3029_STATUS, &sr); |
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if (ret < 0) |
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break; |
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if (!(sr & RV3029_STATUS_EEBUSY)) |
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break; |
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usleep_range(1000, 10000); |
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} |
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if (i <= 0) { |
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dev_err(rv3029->dev, "EEPROM busy wait timeout.\n"); |
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return -ETIMEDOUT; |
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} |
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return ret; |
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} |
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static int rv3029_eeprom_exit(struct rv3029_data *rv3029) |
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{ |
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/* Re-enable eeprom refresh */ |
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return regmap_update_bits(rv3029->regmap, RV3029_ONOFF_CTRL, |
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RV3029_ONOFF_CTRL_EERE, |
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RV3029_ONOFF_CTRL_EERE); |
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} |
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static int rv3029_eeprom_enter(struct rv3029_data *rv3029) |
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{ |
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unsigned int sr; |
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int ret; |
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/* Check whether we are in the allowed voltage range. */ |
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ret = regmap_read(rv3029->regmap, RV3029_STATUS, &sr); |
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if (ret < 0) |
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return ret; |
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if (sr & RV3029_STATUS_VLOW2) |
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return -ENODEV; |
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if (sr & RV3029_STATUS_VLOW1) { |
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/* We clear the bits and retry once just in case |
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* we had a brown out in early startup. |
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*/ |
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ret = regmap_update_bits(rv3029->regmap, RV3029_STATUS, |
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RV3029_STATUS_VLOW1, 0); |
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if (ret < 0) |
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return ret; |
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usleep_range(1000, 10000); |
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ret = regmap_read(rv3029->regmap, RV3029_STATUS, &sr); |
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if (ret < 0) |
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return ret; |
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if (sr & RV3029_STATUS_VLOW1) { |
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dev_err(rv3029->dev, |
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"Supply voltage is too low to safely access the EEPROM.\n"); |
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return -ENODEV; |
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} |
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} |
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/* Disable eeprom refresh. */ |
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ret = regmap_update_bits(rv3029->regmap, RV3029_ONOFF_CTRL, |
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RV3029_ONOFF_CTRL_EERE, 0); |
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if (ret < 0) |
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return ret; |
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/* Wait for any previous eeprom accesses to finish. */ |
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ret = rv3029_eeprom_busywait(rv3029); |
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if (ret < 0) |
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rv3029_eeprom_exit(rv3029); |
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return ret; |
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} |
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static int rv3029_eeprom_read(struct rv3029_data *rv3029, u8 reg, |
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u8 buf[], size_t len) |
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{ |
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int ret, err; |
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err = rv3029_eeprom_enter(rv3029); |
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if (err < 0) |
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return err; |
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ret = regmap_bulk_read(rv3029->regmap, reg, buf, len); |
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err = rv3029_eeprom_exit(rv3029); |
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if (err < 0) |
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return err; |
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return ret; |
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} |
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static int rv3029_eeprom_write(struct rv3029_data *rv3029, u8 reg, |
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u8 const buf[], size_t len) |
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{ |
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unsigned int tmp; |
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int ret, err; |
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size_t i; |
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err = rv3029_eeprom_enter(rv3029); |
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if (err < 0) |
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return err; |
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for (i = 0; i < len; i++, reg++) { |
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ret = regmap_read(rv3029->regmap, reg, &tmp); |
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if (ret < 0) |
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break; |
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if (tmp != buf[i]) { |
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tmp = buf[i]; |
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ret = regmap_write(rv3029->regmap, reg, tmp); |
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if (ret < 0) |
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break; |
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} |
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ret = rv3029_eeprom_busywait(rv3029); |
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if (ret < 0) |
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break; |
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} |
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err = rv3029_eeprom_exit(rv3029); |
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if (err < 0) |
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return err; |
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return ret; |
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} |
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static int rv3029_eeprom_update_bits(struct rv3029_data *rv3029, |
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u8 reg, u8 mask, u8 set) |
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{ |
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u8 buf; |
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int ret; |
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ret = rv3029_eeprom_read(rv3029, reg, &buf, 1); |
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if (ret < 0) |
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return ret; |
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buf &= ~mask; |
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buf |= set & mask; |
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ret = rv3029_eeprom_write(rv3029, reg, &buf, 1); |
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if (ret < 0) |
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return ret; |
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return 0; |
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} |
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static irqreturn_t rv3029_handle_irq(int irq, void *dev_id) |
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{ |
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struct device *dev = dev_id; |
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struct rv3029_data *rv3029 = dev_get_drvdata(dev); |
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unsigned int flags, controls; |
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unsigned long events = 0; |
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int ret; |
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rtc_lock(rv3029->rtc); |
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ret = regmap_read(rv3029->regmap, RV3029_IRQ_CTRL, &controls); |
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if (ret) { |
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dev_warn(dev, "Read IRQ Control Register error %d\n", ret); |
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rtc_unlock(rv3029->rtc); |
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return IRQ_NONE; |
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} |
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ret = regmap_read(rv3029->regmap, RV3029_IRQ_FLAGS, &flags); |
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if (ret) { |
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dev_warn(dev, "Read IRQ Flags Register error %d\n", ret); |
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rtc_unlock(rv3029->rtc); |
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return IRQ_NONE; |
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} |
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if (flags & RV3029_IRQ_FLAGS_AF) { |
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flags &= ~RV3029_IRQ_FLAGS_AF; |
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controls &= ~RV3029_IRQ_CTRL_AIE; |
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events |= RTC_AF; |
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} |
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if (events) { |
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rtc_update_irq(rv3029->rtc, 1, events); |
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regmap_write(rv3029->regmap, RV3029_IRQ_FLAGS, flags); |
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regmap_write(rv3029->regmap, RV3029_IRQ_CTRL, controls); |
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} |
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rtc_unlock(rv3029->rtc); |
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return IRQ_HANDLED; |
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} |
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static int rv3029_read_time(struct device *dev, struct rtc_time *tm) |
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{ |
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struct rv3029_data *rv3029 = dev_get_drvdata(dev); |
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unsigned int sr; |
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int ret; |
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u8 regs[RV3029_WATCH_SECTION_LEN] = { 0, }; |
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ret = regmap_read(rv3029->regmap, RV3029_STATUS, &sr); |
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if (ret < 0) |
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return ret; |
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if (sr & (RV3029_STATUS_VLOW2 | RV3029_STATUS_PON)) |
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return -EINVAL; |
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ret = regmap_bulk_read(rv3029->regmap, RV3029_W_SEC, regs, |
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RV3029_WATCH_SECTION_LEN); |
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if (ret < 0) |
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return ret; |
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tm->tm_sec = bcd2bin(regs[RV3029_W_SEC - RV3029_W_SEC]); |
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tm->tm_min = bcd2bin(regs[RV3029_W_MINUTES - RV3029_W_SEC]); |
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/* HR field has a more complex interpretation */ |
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{ |
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const u8 _hr = regs[RV3029_W_HOURS - RV3029_W_SEC]; |
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if (_hr & RV3029_REG_HR_12_24) { |
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/* 12h format */ |
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tm->tm_hour = bcd2bin(_hr & 0x1f); |
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if (_hr & RV3029_REG_HR_PM) /* PM flag set */ |
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tm->tm_hour += 12; |
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} else /* 24h format */ |
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tm->tm_hour = bcd2bin(_hr & 0x3f); |
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} |
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tm->tm_mday = bcd2bin(regs[RV3029_W_DATE - RV3029_W_SEC]); |
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tm->tm_mon = bcd2bin(regs[RV3029_W_MONTHS - RV3029_W_SEC]) - 1; |
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tm->tm_year = bcd2bin(regs[RV3029_W_YEARS - RV3029_W_SEC]) + 100; |
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tm->tm_wday = bcd2bin(regs[RV3029_W_DAYS - RV3029_W_SEC]) - 1; |
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return 0; |
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} |
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static int rv3029_read_alarm(struct device *dev, struct rtc_wkalrm *alarm) |
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{ |
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struct rv3029_data *rv3029 = dev_get_drvdata(dev); |
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struct rtc_time *const tm = &alarm->time; |
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unsigned int controls, flags; |
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int ret; |
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u8 regs[8]; |
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ret = regmap_bulk_read(rv3029->regmap, RV3029_A_SC, regs, |
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RV3029_ALARM_SECTION_LEN); |
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if (ret < 0) |
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return ret; |
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ret = regmap_read(rv3029->regmap, RV3029_IRQ_CTRL, &controls); |
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if (ret) |
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return ret; |
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ret = regmap_read(rv3029->regmap, RV3029_IRQ_FLAGS, &flags); |
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if (ret < 0) |
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return ret; |
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tm->tm_sec = bcd2bin(regs[RV3029_A_SC - RV3029_A_SC] & 0x7f); |
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tm->tm_min = bcd2bin(regs[RV3029_A_MN - RV3029_A_SC] & 0x7f); |
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tm->tm_hour = bcd2bin(regs[RV3029_A_HR - RV3029_A_SC] & 0x3f); |
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tm->tm_mday = bcd2bin(regs[RV3029_A_DT - RV3029_A_SC] & 0x3f); |
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tm->tm_mon = bcd2bin(regs[RV3029_A_MO - RV3029_A_SC] & 0x1f) - 1; |
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tm->tm_year = bcd2bin(regs[RV3029_A_YR - RV3029_A_SC] & 0x7f) + 100; |
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tm->tm_wday = bcd2bin(regs[RV3029_A_DW - RV3029_A_SC] & 0x07) - 1; |
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alarm->enabled = !!(controls & RV3029_IRQ_CTRL_AIE); |
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alarm->pending = (flags & RV3029_IRQ_FLAGS_AF) && alarm->enabled; |
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return 0; |
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} |
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static int rv3029_alarm_irq_enable(struct device *dev, unsigned int enable) |
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{ |
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struct rv3029_data *rv3029 = dev_get_drvdata(dev); |
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return regmap_update_bits(rv3029->regmap, RV3029_IRQ_CTRL, |
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RV3029_IRQ_CTRL_AIE, |
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enable ? RV3029_IRQ_CTRL_AIE : 0); |
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} |
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static int rv3029_set_alarm(struct device *dev, struct rtc_wkalrm *alarm) |
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{ |
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struct rv3029_data *rv3029 = dev_get_drvdata(dev); |
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struct rtc_time *const tm = &alarm->time; |
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int ret; |
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u8 regs[8]; |
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/* Activate all the alarms with AE_x bit */ |
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regs[RV3029_A_SC - RV3029_A_SC] = bin2bcd(tm->tm_sec) | RV3029_A_AE_X; |
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regs[RV3029_A_MN - RV3029_A_SC] = bin2bcd(tm->tm_min) | RV3029_A_AE_X; |
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regs[RV3029_A_HR - RV3029_A_SC] = (bin2bcd(tm->tm_hour) & 0x3f) |
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| RV3029_A_AE_X; |
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regs[RV3029_A_DT - RV3029_A_SC] = (bin2bcd(tm->tm_mday) & 0x3f) |
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| RV3029_A_AE_X; |
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regs[RV3029_A_MO - RV3029_A_SC] = (bin2bcd(tm->tm_mon + 1) & 0x1f) |
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| RV3029_A_AE_X; |
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regs[RV3029_A_DW - RV3029_A_SC] = (bin2bcd(tm->tm_wday + 1) & 0x7) |
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| RV3029_A_AE_X; |
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regs[RV3029_A_YR - RV3029_A_SC] = (bin2bcd(tm->tm_year - 100)) |
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| RV3029_A_AE_X; |
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/* Write the alarm */ |
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ret = regmap_bulk_write(rv3029->regmap, RV3029_A_SC, regs, |
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RV3029_ALARM_SECTION_LEN); |
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if (ret < 0) |
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return ret; |
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return rv3029_alarm_irq_enable(dev, alarm->enabled); |
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} |
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static int rv3029_set_time(struct device *dev, struct rtc_time *tm) |
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{ |
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struct rv3029_data *rv3029 = dev_get_drvdata(dev); |
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u8 regs[8]; |
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int ret; |
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regs[RV3029_W_SEC - RV3029_W_SEC] = bin2bcd(tm->tm_sec); |
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regs[RV3029_W_MINUTES - RV3029_W_SEC] = bin2bcd(tm->tm_min); |
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regs[RV3029_W_HOURS - RV3029_W_SEC] = bin2bcd(tm->tm_hour); |
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regs[RV3029_W_DATE - RV3029_W_SEC] = bin2bcd(tm->tm_mday); |
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regs[RV3029_W_MONTHS - RV3029_W_SEC] = bin2bcd(tm->tm_mon + 1); |
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regs[RV3029_W_DAYS - RV3029_W_SEC] = bin2bcd(tm->tm_wday + 1) & 0x7; |
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regs[RV3029_W_YEARS - RV3029_W_SEC] = bin2bcd(tm->tm_year - 100); |
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ret = regmap_bulk_write(rv3029->regmap, RV3029_W_SEC, regs, |
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RV3029_WATCH_SECTION_LEN); |
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if (ret < 0) |
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return ret; |
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/* clear PON and VLOW2 bits */ |
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return regmap_update_bits(rv3029->regmap, RV3029_STATUS, |
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RV3029_STATUS_PON | RV3029_STATUS_VLOW2, 0); |
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} |
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static int rv3029_ioctl(struct device *dev, unsigned int cmd, unsigned long arg) |
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{ |
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struct rv3029_data *rv3029 = dev_get_drvdata(dev); |
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unsigned long vl = 0; |
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int sr, ret = 0; |
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switch (cmd) { |
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case RTC_VL_READ: |
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ret = regmap_read(rv3029->regmap, RV3029_STATUS, &sr); |
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if (ret < 0) |
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return ret; |
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if (sr & RV3029_STATUS_VLOW1) |
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vl = RTC_VL_ACCURACY_LOW; |
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if (sr & (RV3029_STATUS_VLOW2 | RV3029_STATUS_PON)) |
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vl |= RTC_VL_DATA_INVALID; |
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return put_user(vl, (unsigned int __user *)arg); |
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case RTC_VL_CLR: |
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return regmap_update_bits(rv3029->regmap, RV3029_STATUS, |
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RV3029_STATUS_VLOW1, 0); |
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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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static int rv3029_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, RV3029_RAM_PAGE + offset, val, bytes); |
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} |
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static int rv3029_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, RV3029_RAM_PAGE + offset, val, bytes); |
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} |
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|
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static const struct rv3029_trickle_tab_elem { |
|
u32 r; /* resistance in ohms */ |
|
u8 conf; /* trickle config bits */ |
|
} rv3029_trickle_tab[] = { |
|
{ |
|
.r = 1076, |
|
.conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_5K | |
|
RV3029_TRICKLE_20K | RV3029_TRICKLE_80K, |
|
}, { |
|
.r = 1091, |
|
.conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_5K | |
|
RV3029_TRICKLE_20K, |
|
}, { |
|
.r = 1137, |
|
.conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_5K | |
|
RV3029_TRICKLE_80K, |
|
}, { |
|
.r = 1154, |
|
.conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_5K, |
|
}, { |
|
.r = 1371, |
|
.conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_20K | |
|
RV3029_TRICKLE_80K, |
|
}, { |
|
.r = 1395, |
|
.conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_20K, |
|
}, { |
|
.r = 1472, |
|
.conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_80K, |
|
}, { |
|
.r = 1500, |
|
.conf = RV3029_TRICKLE_1K, |
|
}, { |
|
.r = 3810, |
|
.conf = RV3029_TRICKLE_5K | RV3029_TRICKLE_20K | |
|
RV3029_TRICKLE_80K, |
|
}, { |
|
.r = 4000, |
|
.conf = RV3029_TRICKLE_5K | RV3029_TRICKLE_20K, |
|
}, { |
|
.r = 4706, |
|
.conf = RV3029_TRICKLE_5K | RV3029_TRICKLE_80K, |
|
}, { |
|
.r = 5000, |
|
.conf = RV3029_TRICKLE_5K, |
|
}, { |
|
.r = 16000, |
|
.conf = RV3029_TRICKLE_20K | RV3029_TRICKLE_80K, |
|
}, { |
|
.r = 20000, |
|
.conf = RV3029_TRICKLE_20K, |
|
}, { |
|
.r = 80000, |
|
.conf = RV3029_TRICKLE_80K, |
|
}, |
|
}; |
|
|
|
static void rv3029_trickle_config(struct device *dev) |
|
{ |
|
struct rv3029_data *rv3029 = dev_get_drvdata(dev); |
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struct device_node *of_node = dev->of_node; |
|
const struct rv3029_trickle_tab_elem *elem; |
|
int i, err; |
|
u32 ohms; |
|
u8 trickle_set_bits; |
|
|
|
if (!of_node) |
|
return; |
|
|
|
/* Configure the trickle charger. */ |
|
err = of_property_read_u32(of_node, "trickle-resistor-ohms", &ohms); |
|
if (err) { |
|
/* Disable trickle charger. */ |
|
trickle_set_bits = 0; |
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} else { |
|
/* Enable trickle charger. */ |
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for (i = 0; i < ARRAY_SIZE(rv3029_trickle_tab); i++) { |
|
elem = &rv3029_trickle_tab[i]; |
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if (elem->r >= ohms) |
|
break; |
|
} |
|
trickle_set_bits = elem->conf; |
|
dev_info(dev, |
|
"Trickle charger enabled at %d ohms resistance.\n", |
|
elem->r); |
|
} |
|
err = rv3029_eeprom_update_bits(rv3029, RV3029_CONTROL_E2P_EECTRL, |
|
RV3029_TRICKLE_MASK, |
|
trickle_set_bits); |
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if (err < 0) |
|
dev_err(dev, "Failed to update trickle charger config\n"); |
|
} |
|
|
|
#ifdef CONFIG_RTC_DRV_RV3029_HWMON |
|
|
|
static int rv3029_read_temp(struct rv3029_data *rv3029, int *temp_mC) |
|
{ |
|
unsigned int temp; |
|
int ret; |
|
|
|
ret = regmap_read(rv3029->regmap, RV3029_TEMP_PAGE, &temp); |
|
if (ret < 0) |
|
return ret; |
|
|
|
*temp_mC = ((int)temp - 60) * 1000; |
|
|
|
return 0; |
|
} |
|
|
|
static ssize_t rv3029_hwmon_show_temp(struct device *dev, |
|
struct device_attribute *attr, |
|
char *buf) |
|
{ |
|
struct rv3029_data *rv3029 = dev_get_drvdata(dev); |
|
int ret, temp_mC; |
|
|
|
ret = rv3029_read_temp(rv3029, &temp_mC); |
|
if (ret < 0) |
|
return ret; |
|
|
|
return sprintf(buf, "%d\n", temp_mC); |
|
} |
|
|
|
static ssize_t rv3029_hwmon_set_update_interval(struct device *dev, |
|
struct device_attribute *attr, |
|
const char *buf, |
|
size_t count) |
|
{ |
|
struct rv3029_data *rv3029 = dev_get_drvdata(dev); |
|
unsigned int th_set_bits = 0; |
|
unsigned long interval_ms; |
|
int ret; |
|
|
|
ret = kstrtoul(buf, 10, &interval_ms); |
|
if (ret < 0) |
|
return ret; |
|
|
|
if (interval_ms != 0) { |
|
th_set_bits |= RV3029_EECTRL_THE; |
|
if (interval_ms >= 16000) |
|
th_set_bits |= RV3029_EECTRL_THP; |
|
} |
|
ret = rv3029_eeprom_update_bits(rv3029, RV3029_CONTROL_E2P_EECTRL, |
|
RV3029_EECTRL_THE | RV3029_EECTRL_THP, |
|
th_set_bits); |
|
if (ret < 0) |
|
return ret; |
|
|
|
return count; |
|
} |
|
|
|
static ssize_t rv3029_hwmon_show_update_interval(struct device *dev, |
|
struct device_attribute *attr, |
|
char *buf) |
|
{ |
|
struct rv3029_data *rv3029 = dev_get_drvdata(dev); |
|
int ret, interval_ms; |
|
u8 eectrl; |
|
|
|
ret = rv3029_eeprom_read(rv3029, RV3029_CONTROL_E2P_EECTRL, |
|
&eectrl, 1); |
|
if (ret < 0) |
|
return ret; |
|
|
|
if (eectrl & RV3029_EECTRL_THE) { |
|
if (eectrl & RV3029_EECTRL_THP) |
|
interval_ms = 16000; |
|
else |
|
interval_ms = 1000; |
|
} else { |
|
interval_ms = 0; |
|
} |
|
|
|
return sprintf(buf, "%d\n", interval_ms); |
|
} |
|
|
|
static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, rv3029_hwmon_show_temp, |
|
NULL, 0); |
|
static SENSOR_DEVICE_ATTR(update_interval, S_IWUSR | S_IRUGO, |
|
rv3029_hwmon_show_update_interval, |
|
rv3029_hwmon_set_update_interval, 0); |
|
|
|
static struct attribute *rv3029_hwmon_attrs[] = { |
|
&sensor_dev_attr_temp1_input.dev_attr.attr, |
|
&sensor_dev_attr_update_interval.dev_attr.attr, |
|
NULL, |
|
}; |
|
ATTRIBUTE_GROUPS(rv3029_hwmon); |
|
|
|
static void rv3029_hwmon_register(struct device *dev, const char *name) |
|
{ |
|
struct rv3029_data *rv3029 = dev_get_drvdata(dev); |
|
struct device *hwmon_dev; |
|
|
|
hwmon_dev = devm_hwmon_device_register_with_groups(dev, name, rv3029, |
|
rv3029_hwmon_groups); |
|
if (IS_ERR(hwmon_dev)) { |
|
dev_warn(dev, "unable to register hwmon device %ld\n", |
|
PTR_ERR(hwmon_dev)); |
|
} |
|
} |
|
|
|
#else /* CONFIG_RTC_DRV_RV3029_HWMON */ |
|
|
|
static void rv3029_hwmon_register(struct device *dev, const char *name) |
|
{ |
|
} |
|
|
|
#endif /* CONFIG_RTC_DRV_RV3029_HWMON */ |
|
|
|
static const struct rtc_class_ops rv3029_rtc_ops = { |
|
.read_time = rv3029_read_time, |
|
.set_time = rv3029_set_time, |
|
.ioctl = rv3029_ioctl, |
|
.read_alarm = rv3029_read_alarm, |
|
.set_alarm = rv3029_set_alarm, |
|
.alarm_irq_enable = rv3029_alarm_irq_enable, |
|
}; |
|
|
|
static int rv3029_probe(struct device *dev, struct regmap *regmap, int irq, |
|
const char *name) |
|
{ |
|
struct rv3029_data *rv3029; |
|
struct nvmem_config nvmem_cfg = { |
|
.name = "rv3029_nvram", |
|
.word_size = 1, |
|
.stride = 1, |
|
.size = RV3029_RAM_SECTION_LEN, |
|
.type = NVMEM_TYPE_BATTERY_BACKED, |
|
.reg_read = rv3029_nvram_read, |
|
.reg_write = rv3029_nvram_write, |
|
}; |
|
int rc = 0; |
|
|
|
rv3029 = devm_kzalloc(dev, sizeof(*rv3029), GFP_KERNEL); |
|
if (!rv3029) |
|
return -ENOMEM; |
|
|
|
rv3029->regmap = regmap; |
|
rv3029->irq = irq; |
|
rv3029->dev = dev; |
|
dev_set_drvdata(dev, rv3029); |
|
|
|
rv3029_trickle_config(dev); |
|
rv3029_hwmon_register(dev, name); |
|
|
|
rv3029->rtc = devm_rtc_allocate_device(dev); |
|
if (IS_ERR(rv3029->rtc)) |
|
return PTR_ERR(rv3029->rtc); |
|
|
|
if (rv3029->irq > 0) { |
|
rc = devm_request_threaded_irq(dev, rv3029->irq, |
|
NULL, rv3029_handle_irq, |
|
IRQF_TRIGGER_LOW | IRQF_ONESHOT, |
|
"rv3029", dev); |
|
if (rc) { |
|
dev_warn(dev, "unable to request IRQ, alarms disabled\n"); |
|
rv3029->irq = 0; |
|
} |
|
} |
|
if (!rv3029->irq) |
|
clear_bit(RTC_FEATURE_ALARM, rv3029->rtc->features); |
|
|
|
rv3029->rtc->ops = &rv3029_rtc_ops; |
|
rv3029->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000; |
|
rv3029->rtc->range_max = RTC_TIMESTAMP_END_2079; |
|
|
|
rc = devm_rtc_register_device(rv3029->rtc); |
|
if (rc) |
|
return rc; |
|
|
|
nvmem_cfg.priv = rv3029->regmap; |
|
devm_rtc_nvmem_register(rv3029->rtc, &nvmem_cfg); |
|
|
|
return 0; |
|
} |
|
|
|
static const struct regmap_range rv3029_holes_range[] = { |
|
regmap_reg_range(0x05, 0x07), |
|
regmap_reg_range(0x0f, 0x0f), |
|
regmap_reg_range(0x17, 0x17), |
|
regmap_reg_range(0x1a, 0x1f), |
|
regmap_reg_range(0x21, 0x27), |
|
regmap_reg_range(0x34, 0x37), |
|
}; |
|
|
|
static const struct regmap_access_table rv3029_regs = { |
|
.no_ranges = rv3029_holes_range, |
|
.n_no_ranges = ARRAY_SIZE(rv3029_holes_range), |
|
}; |
|
|
|
static const struct regmap_config config = { |
|
.reg_bits = 8, |
|
.val_bits = 8, |
|
.rd_table = &rv3029_regs, |
|
.wr_table = &rv3029_regs, |
|
.max_register = 0x3f, |
|
}; |
|
|
|
#if IS_ENABLED(CONFIG_I2C) |
|
|
|
static int rv3029_i2c_probe(struct i2c_client *client, |
|
const struct i2c_device_id *id) |
|
{ |
|
struct regmap *regmap; |
|
if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_I2C_BLOCK | |
|
I2C_FUNC_SMBUS_BYTE)) { |
|
dev_err(&client->dev, "Adapter does not support SMBUS_I2C_BLOCK or SMBUS_I2C_BYTE\n"); |
|
return -ENODEV; |
|
} |
|
|
|
regmap = devm_regmap_init_i2c(client, &config); |
|
if (IS_ERR(regmap)) |
|
return PTR_ERR(regmap); |
|
|
|
return rv3029_probe(&client->dev, regmap, client->irq, client->name); |
|
} |
|
|
|
static const struct i2c_device_id rv3029_id[] = { |
|
{ "rv3029", 0 }, |
|
{ "rv3029c2", 0 }, |
|
{ } |
|
}; |
|
MODULE_DEVICE_TABLE(i2c, rv3029_id); |
|
|
|
static const __maybe_unused struct of_device_id rv3029_of_match[] = { |
|
{ .compatible = "microcrystal,rv3029" }, |
|
{ } |
|
}; |
|
MODULE_DEVICE_TABLE(of, rv3029_of_match); |
|
|
|
static struct i2c_driver rv3029_driver = { |
|
.driver = { |
|
.name = "rv3029", |
|
.of_match_table = of_match_ptr(rv3029_of_match), |
|
}, |
|
.probe = rv3029_i2c_probe, |
|
.id_table = rv3029_id, |
|
}; |
|
|
|
static int __init rv3029_register_driver(void) |
|
{ |
|
return i2c_add_driver(&rv3029_driver); |
|
} |
|
|
|
static void rv3029_unregister_driver(void) |
|
{ |
|
i2c_del_driver(&rv3029_driver); |
|
} |
|
|
|
#else |
|
|
|
static int __init rv3029_register_driver(void) |
|
{ |
|
return 0; |
|
} |
|
|
|
static void rv3029_unregister_driver(void) |
|
{ |
|
} |
|
|
|
#endif |
|
|
|
#if IS_ENABLED(CONFIG_SPI_MASTER) |
|
|
|
static int rv3049_probe(struct spi_device *spi) |
|
{ |
|
struct regmap *regmap; |
|
|
|
regmap = devm_regmap_init_spi(spi, &config); |
|
if (IS_ERR(regmap)) |
|
return PTR_ERR(regmap); |
|
|
|
return rv3029_probe(&spi->dev, regmap, spi->irq, "rv3049"); |
|
} |
|
|
|
static struct spi_driver rv3049_driver = { |
|
.driver = { |
|
.name = "rv3049", |
|
}, |
|
.probe = rv3049_probe, |
|
}; |
|
|
|
static int __init rv3049_register_driver(void) |
|
{ |
|
return spi_register_driver(&rv3049_driver); |
|
} |
|
|
|
static void __exit rv3049_unregister_driver(void) |
|
{ |
|
spi_unregister_driver(&rv3049_driver); |
|
} |
|
|
|
#else |
|
|
|
static int __init rv3049_register_driver(void) |
|
{ |
|
return 0; |
|
} |
|
|
|
static void __exit rv3049_unregister_driver(void) |
|
{ |
|
} |
|
|
|
#endif |
|
|
|
static int __init rv30x9_init(void) |
|
{ |
|
int ret; |
|
|
|
ret = rv3029_register_driver(); |
|
if (ret) |
|
return ret; |
|
|
|
ret = rv3049_register_driver(); |
|
if (ret) |
|
rv3029_unregister_driver(); |
|
|
|
return ret; |
|
} |
|
module_init(rv30x9_init) |
|
|
|
static void __exit rv30x9_exit(void) |
|
{ |
|
rv3049_unregister_driver(); |
|
rv3029_unregister_driver(); |
|
} |
|
module_exit(rv30x9_exit) |
|
|
|
MODULE_AUTHOR("Gregory Hermant <[email protected]>"); |
|
MODULE_AUTHOR("Michael Buesch <[email protected]>"); |
|
MODULE_DESCRIPTION("Micro Crystal RV3029/RV3049 RTC driver"); |
|
MODULE_LICENSE("GPL"); |
|
MODULE_ALIAS("spi:rv3049");
|
|
|