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446 lines
10 KiB
446 lines
10 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* drivers/rtc/rtc-pcf85363.c |
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* |
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* Driver for NXP PCF85363 real-time clock. |
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* |
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* Copyright (C) 2017 Eric Nelson |
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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/slab.h> |
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#include <linux/rtc.h> |
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#include <linux/init.h> |
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#include <linux/err.h> |
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#include <linux/errno.h> |
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#include <linux/bcd.h> |
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#include <linux/of.h> |
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#include <linux/of_device.h> |
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#include <linux/regmap.h> |
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/* |
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* Date/Time registers |
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*/ |
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#define DT_100THS 0x00 |
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#define DT_SECS 0x01 |
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#define DT_MINUTES 0x02 |
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#define DT_HOURS 0x03 |
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#define DT_DAYS 0x04 |
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#define DT_WEEKDAYS 0x05 |
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#define DT_MONTHS 0x06 |
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#define DT_YEARS 0x07 |
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/* |
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* Alarm registers |
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*/ |
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#define DT_SECOND_ALM1 0x08 |
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#define DT_MINUTE_ALM1 0x09 |
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#define DT_HOUR_ALM1 0x0a |
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#define DT_DAY_ALM1 0x0b |
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#define DT_MONTH_ALM1 0x0c |
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#define DT_MINUTE_ALM2 0x0d |
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#define DT_HOUR_ALM2 0x0e |
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#define DT_WEEKDAY_ALM2 0x0f |
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#define DT_ALARM_EN 0x10 |
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/* |
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* Time stamp registers |
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*/ |
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#define DT_TIMESTAMP1 0x11 |
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#define DT_TIMESTAMP2 0x17 |
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#define DT_TIMESTAMP3 0x1d |
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#define DT_TS_MODE 0x23 |
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/* |
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* control registers |
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*/ |
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#define CTRL_OFFSET 0x24 |
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#define CTRL_OSCILLATOR 0x25 |
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#define CTRL_BATTERY 0x26 |
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#define CTRL_PIN_IO 0x27 |
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#define CTRL_FUNCTION 0x28 |
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#define CTRL_INTA_EN 0x29 |
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#define CTRL_INTB_EN 0x2a |
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#define CTRL_FLAGS 0x2b |
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#define CTRL_RAMBYTE 0x2c |
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#define CTRL_WDOG 0x2d |
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#define CTRL_STOP_EN 0x2e |
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#define CTRL_RESETS 0x2f |
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#define CTRL_RAM 0x40 |
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#define ALRM_SEC_A1E BIT(0) |
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#define ALRM_MIN_A1E BIT(1) |
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#define ALRM_HR_A1E BIT(2) |
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#define ALRM_DAY_A1E BIT(3) |
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#define ALRM_MON_A1E BIT(4) |
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#define ALRM_MIN_A2E BIT(5) |
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#define ALRM_HR_A2E BIT(6) |
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#define ALRM_DAY_A2E BIT(7) |
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#define INT_WDIE BIT(0) |
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#define INT_BSIE BIT(1) |
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#define INT_TSRIE BIT(2) |
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#define INT_A2IE BIT(3) |
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#define INT_A1IE BIT(4) |
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#define INT_OIE BIT(5) |
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#define INT_PIE BIT(6) |
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#define INT_ILP BIT(7) |
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#define FLAGS_TSR1F BIT(0) |
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#define FLAGS_TSR2F BIT(1) |
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#define FLAGS_TSR3F BIT(2) |
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#define FLAGS_BSF BIT(3) |
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#define FLAGS_WDF BIT(4) |
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#define FLAGS_A1F BIT(5) |
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#define FLAGS_A2F BIT(6) |
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#define FLAGS_PIF BIT(7) |
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#define PIN_IO_INTAPM GENMASK(1, 0) |
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#define PIN_IO_INTA_CLK 0 |
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#define PIN_IO_INTA_BAT 1 |
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#define PIN_IO_INTA_OUT 2 |
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#define PIN_IO_INTA_HIZ 3 |
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#define STOP_EN_STOP BIT(0) |
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#define RESET_CPR 0xa4 |
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#define NVRAM_SIZE 0x40 |
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struct pcf85363 { |
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struct rtc_device *rtc; |
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struct regmap *regmap; |
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}; |
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struct pcf85x63_config { |
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struct regmap_config regmap; |
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unsigned int num_nvram; |
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}; |
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static int pcf85363_rtc_read_time(struct device *dev, struct rtc_time *tm) |
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{ |
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struct pcf85363 *pcf85363 = dev_get_drvdata(dev); |
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unsigned char buf[DT_YEARS + 1]; |
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int ret, len = sizeof(buf); |
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/* read the RTC date and time registers all at once */ |
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ret = regmap_bulk_read(pcf85363->regmap, DT_100THS, buf, len); |
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if (ret) { |
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dev_err(dev, "%s: error %d\n", __func__, ret); |
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return ret; |
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} |
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tm->tm_year = bcd2bin(buf[DT_YEARS]); |
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/* adjust for 1900 base of rtc_time */ |
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tm->tm_year += 100; |
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tm->tm_wday = buf[DT_WEEKDAYS] & 7; |
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buf[DT_SECS] &= 0x7F; |
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tm->tm_sec = bcd2bin(buf[DT_SECS]); |
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buf[DT_MINUTES] &= 0x7F; |
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tm->tm_min = bcd2bin(buf[DT_MINUTES]); |
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tm->tm_hour = bcd2bin(buf[DT_HOURS]); |
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tm->tm_mday = bcd2bin(buf[DT_DAYS]); |
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tm->tm_mon = bcd2bin(buf[DT_MONTHS]) - 1; |
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return 0; |
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} |
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static int pcf85363_rtc_set_time(struct device *dev, struct rtc_time *tm) |
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{ |
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struct pcf85363 *pcf85363 = dev_get_drvdata(dev); |
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unsigned char tmp[11]; |
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unsigned char *buf = &tmp[2]; |
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int ret; |
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tmp[0] = STOP_EN_STOP; |
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tmp[1] = RESET_CPR; |
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buf[DT_100THS] = 0; |
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buf[DT_SECS] = bin2bcd(tm->tm_sec); |
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buf[DT_MINUTES] = bin2bcd(tm->tm_min); |
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buf[DT_HOURS] = bin2bcd(tm->tm_hour); |
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buf[DT_DAYS] = bin2bcd(tm->tm_mday); |
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buf[DT_WEEKDAYS] = tm->tm_wday; |
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buf[DT_MONTHS] = bin2bcd(tm->tm_mon + 1); |
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buf[DT_YEARS] = bin2bcd(tm->tm_year % 100); |
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ret = regmap_bulk_write(pcf85363->regmap, CTRL_STOP_EN, |
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tmp, 2); |
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if (ret) |
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return ret; |
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ret = regmap_bulk_write(pcf85363->regmap, DT_100THS, |
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buf, sizeof(tmp) - 2); |
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if (ret) |
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return ret; |
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return regmap_write(pcf85363->regmap, CTRL_STOP_EN, 0); |
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} |
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static int pcf85363_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) |
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{ |
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struct pcf85363 *pcf85363 = dev_get_drvdata(dev); |
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unsigned char buf[DT_MONTH_ALM1 - DT_SECOND_ALM1 + 1]; |
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unsigned int val; |
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int ret; |
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ret = regmap_bulk_read(pcf85363->regmap, DT_SECOND_ALM1, buf, |
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sizeof(buf)); |
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if (ret) |
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return ret; |
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alrm->time.tm_sec = bcd2bin(buf[0]); |
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alrm->time.tm_min = bcd2bin(buf[1]); |
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alrm->time.tm_hour = bcd2bin(buf[2]); |
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alrm->time.tm_mday = bcd2bin(buf[3]); |
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alrm->time.tm_mon = bcd2bin(buf[4]) - 1; |
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ret = regmap_read(pcf85363->regmap, CTRL_INTA_EN, &val); |
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if (ret) |
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return ret; |
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alrm->enabled = !!(val & INT_A1IE); |
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return 0; |
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} |
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static int _pcf85363_rtc_alarm_irq_enable(struct pcf85363 *pcf85363, unsigned |
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int enabled) |
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{ |
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unsigned int alarm_flags = ALRM_SEC_A1E | ALRM_MIN_A1E | ALRM_HR_A1E | |
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ALRM_DAY_A1E | ALRM_MON_A1E; |
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int ret; |
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ret = regmap_update_bits(pcf85363->regmap, DT_ALARM_EN, alarm_flags, |
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enabled ? alarm_flags : 0); |
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if (ret) |
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return ret; |
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ret = regmap_update_bits(pcf85363->regmap, CTRL_INTA_EN, |
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INT_A1IE, enabled ? INT_A1IE : 0); |
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if (ret || enabled) |
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return ret; |
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/* clear current flags */ |
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return regmap_update_bits(pcf85363->regmap, CTRL_FLAGS, FLAGS_A1F, 0); |
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} |
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static int pcf85363_rtc_alarm_irq_enable(struct device *dev, |
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unsigned int enabled) |
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{ |
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struct pcf85363 *pcf85363 = dev_get_drvdata(dev); |
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return _pcf85363_rtc_alarm_irq_enable(pcf85363, enabled); |
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} |
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static int pcf85363_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) |
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{ |
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struct pcf85363 *pcf85363 = dev_get_drvdata(dev); |
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unsigned char buf[DT_MONTH_ALM1 - DT_SECOND_ALM1 + 1]; |
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int ret; |
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buf[0] = bin2bcd(alrm->time.tm_sec); |
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buf[1] = bin2bcd(alrm->time.tm_min); |
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buf[2] = bin2bcd(alrm->time.tm_hour); |
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buf[3] = bin2bcd(alrm->time.tm_mday); |
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buf[4] = bin2bcd(alrm->time.tm_mon + 1); |
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/* |
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* Disable the alarm interrupt before changing the value to avoid |
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* spurious interrupts |
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*/ |
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ret = _pcf85363_rtc_alarm_irq_enable(pcf85363, 0); |
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if (ret) |
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return ret; |
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ret = regmap_bulk_write(pcf85363->regmap, DT_SECOND_ALM1, buf, |
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sizeof(buf)); |
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if (ret) |
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return ret; |
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return _pcf85363_rtc_alarm_irq_enable(pcf85363, alrm->enabled); |
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} |
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static irqreturn_t pcf85363_rtc_handle_irq(int irq, void *dev_id) |
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{ |
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struct pcf85363 *pcf85363 = i2c_get_clientdata(dev_id); |
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unsigned int flags; |
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int err; |
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err = regmap_read(pcf85363->regmap, CTRL_FLAGS, &flags); |
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if (err) |
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return IRQ_NONE; |
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if (flags & FLAGS_A1F) { |
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rtc_update_irq(pcf85363->rtc, 1, RTC_IRQF | RTC_AF); |
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regmap_update_bits(pcf85363->regmap, CTRL_FLAGS, FLAGS_A1F, 0); |
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return IRQ_HANDLED; |
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} |
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return IRQ_NONE; |
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} |
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static const struct rtc_class_ops rtc_ops = { |
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.read_time = pcf85363_rtc_read_time, |
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.set_time = pcf85363_rtc_set_time, |
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.read_alarm = pcf85363_rtc_read_alarm, |
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.set_alarm = pcf85363_rtc_set_alarm, |
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.alarm_irq_enable = pcf85363_rtc_alarm_irq_enable, |
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}; |
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static int pcf85363_nvram_read(void *priv, unsigned int offset, void *val, |
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size_t bytes) |
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{ |
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struct pcf85363 *pcf85363 = priv; |
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return regmap_bulk_read(pcf85363->regmap, CTRL_RAM + offset, |
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val, bytes); |
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} |
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static int pcf85363_nvram_write(void *priv, unsigned int offset, void *val, |
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size_t bytes) |
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{ |
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struct pcf85363 *pcf85363 = priv; |
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return regmap_bulk_write(pcf85363->regmap, CTRL_RAM + offset, |
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val, bytes); |
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} |
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static int pcf85x63_nvram_read(void *priv, unsigned int offset, void *val, |
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size_t bytes) |
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{ |
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struct pcf85363 *pcf85363 = priv; |
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unsigned int tmp_val; |
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int ret; |
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ret = regmap_read(pcf85363->regmap, CTRL_RAMBYTE, &tmp_val); |
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(*(unsigned char *) val) = (unsigned char) tmp_val; |
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return ret; |
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} |
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static int pcf85x63_nvram_write(void *priv, unsigned int offset, void *val, |
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size_t bytes) |
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{ |
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struct pcf85363 *pcf85363 = priv; |
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unsigned char tmp_val; |
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tmp_val = *((unsigned char *)val); |
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return regmap_write(pcf85363->regmap, CTRL_RAMBYTE, |
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(unsigned int)tmp_val); |
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} |
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static const struct pcf85x63_config pcf_85263_config = { |
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.regmap = { |
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.reg_bits = 8, |
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.val_bits = 8, |
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.max_register = 0x2f, |
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}, |
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.num_nvram = 1 |
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}; |
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static const struct pcf85x63_config pcf_85363_config = { |
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.regmap = { |
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.reg_bits = 8, |
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.val_bits = 8, |
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.max_register = 0x7f, |
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}, |
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.num_nvram = 2 |
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}; |
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static int pcf85363_probe(struct i2c_client *client, |
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const struct i2c_device_id *id) |
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{ |
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struct pcf85363 *pcf85363; |
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const struct pcf85x63_config *config = &pcf_85363_config; |
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const void *data = of_device_get_match_data(&client->dev); |
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static struct nvmem_config nvmem_cfg[] = { |
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{ |
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.name = "pcf85x63-", |
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.word_size = 1, |
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.stride = 1, |
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.size = 1, |
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.reg_read = pcf85x63_nvram_read, |
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.reg_write = pcf85x63_nvram_write, |
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}, { |
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.name = "pcf85363-", |
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.word_size = 1, |
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.stride = 1, |
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.size = NVRAM_SIZE, |
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.reg_read = pcf85363_nvram_read, |
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.reg_write = pcf85363_nvram_write, |
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}, |
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}; |
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int ret, i; |
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if (data) |
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config = data; |
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pcf85363 = devm_kzalloc(&client->dev, sizeof(struct pcf85363), |
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GFP_KERNEL); |
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if (!pcf85363) |
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return -ENOMEM; |
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pcf85363->regmap = devm_regmap_init_i2c(client, &config->regmap); |
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if (IS_ERR(pcf85363->regmap)) { |
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dev_err(&client->dev, "regmap allocation failed\n"); |
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return PTR_ERR(pcf85363->regmap); |
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} |
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i2c_set_clientdata(client, pcf85363); |
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pcf85363->rtc = devm_rtc_allocate_device(&client->dev); |
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if (IS_ERR(pcf85363->rtc)) |
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return PTR_ERR(pcf85363->rtc); |
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pcf85363->rtc->ops = &rtc_ops; |
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pcf85363->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000; |
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pcf85363->rtc->range_max = RTC_TIMESTAMP_END_2099; |
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clear_bit(RTC_FEATURE_ALARM, pcf85363->rtc->features); |
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if (client->irq > 0) { |
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regmap_write(pcf85363->regmap, CTRL_FLAGS, 0); |
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regmap_update_bits(pcf85363->regmap, CTRL_PIN_IO, |
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PIN_IO_INTA_OUT, PIN_IO_INTAPM); |
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ret = devm_request_threaded_irq(&client->dev, client->irq, |
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NULL, pcf85363_rtc_handle_irq, |
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IRQF_TRIGGER_LOW | IRQF_ONESHOT, |
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"pcf85363", client); |
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if (ret) |
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dev_warn(&client->dev, "unable to request IRQ, alarms disabled\n"); |
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else |
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set_bit(RTC_FEATURE_ALARM, pcf85363->rtc->features); |
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} |
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ret = devm_rtc_register_device(pcf85363->rtc); |
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for (i = 0; i < config->num_nvram; i++) { |
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nvmem_cfg[i].priv = pcf85363; |
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devm_rtc_nvmem_register(pcf85363->rtc, &nvmem_cfg[i]); |
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} |
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return ret; |
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} |
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static const __maybe_unused struct of_device_id dev_ids[] = { |
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{ .compatible = "nxp,pcf85263", .data = &pcf_85263_config }, |
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{ .compatible = "nxp,pcf85363", .data = &pcf_85363_config }, |
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{ /* sentinel */ } |
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}; |
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MODULE_DEVICE_TABLE(of, dev_ids); |
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static struct i2c_driver pcf85363_driver = { |
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.driver = { |
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.name = "pcf85363", |
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.of_match_table = of_match_ptr(dev_ids), |
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}, |
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.probe = pcf85363_probe, |
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}; |
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module_i2c_driver(pcf85363_driver); |
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MODULE_AUTHOR("Eric Nelson"); |
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MODULE_DESCRIPTION("pcf85263/pcf85363 I2C RTC driver"); |
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MODULE_LICENSE("GPL");
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