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766 lines
17 KiB
766 lines
17 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* RTC client/driver for the Maxim/Dallas DS3232/DS3234 Real-Time Clock |
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* |
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* Copyright (C) 2009-2011 Freescale Semiconductor. |
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* Author: Jack Lan <[email protected]> |
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* Copyright (C) 2008 MIMOMax Wireless Ltd. |
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*/ |
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|
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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|
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/interrupt.h> |
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#include <linux/i2c.h> |
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#include <linux/spi/spi.h> |
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#include <linux/rtc.h> |
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#include <linux/bcd.h> |
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#include <linux/slab.h> |
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#include <linux/regmap.h> |
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#include <linux/hwmon.h> |
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|
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#define DS3232_REG_SECONDS 0x00 |
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#define DS3232_REG_MINUTES 0x01 |
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#define DS3232_REG_HOURS 0x02 |
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#define DS3232_REG_AMPM 0x02 |
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#define DS3232_REG_DAY 0x03 |
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#define DS3232_REG_DATE 0x04 |
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#define DS3232_REG_MONTH 0x05 |
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#define DS3232_REG_CENTURY 0x05 |
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#define DS3232_REG_YEAR 0x06 |
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#define DS3232_REG_ALARM1 0x07 /* Alarm 1 BASE */ |
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#define DS3232_REG_ALARM2 0x0B /* Alarm 2 BASE */ |
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#define DS3232_REG_CR 0x0E /* Control register */ |
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# define DS3232_REG_CR_nEOSC 0x80 |
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# define DS3232_REG_CR_INTCN 0x04 |
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# define DS3232_REG_CR_A2IE 0x02 |
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# define DS3232_REG_CR_A1IE 0x01 |
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|
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#define DS3232_REG_SR 0x0F /* control/status register */ |
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# define DS3232_REG_SR_OSF 0x80 |
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# define DS3232_REG_SR_BSY 0x04 |
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# define DS3232_REG_SR_A2F 0x02 |
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# define DS3232_REG_SR_A1F 0x01 |
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|
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#define DS3232_REG_TEMPERATURE 0x11 |
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#define DS3232_REG_SRAM_START 0x14 |
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#define DS3232_REG_SRAM_END 0xFF |
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|
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#define DS3232_REG_SRAM_SIZE 236 |
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|
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struct ds3232 { |
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struct device *dev; |
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struct regmap *regmap; |
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int irq; |
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struct rtc_device *rtc; |
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|
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bool suspended; |
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}; |
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|
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static int ds3232_check_rtc_status(struct device *dev) |
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{ |
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struct ds3232 *ds3232 = dev_get_drvdata(dev); |
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int ret = 0; |
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int control, stat; |
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|
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ret = regmap_read(ds3232->regmap, DS3232_REG_SR, &stat); |
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if (ret) |
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return ret; |
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|
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if (stat & DS3232_REG_SR_OSF) |
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dev_warn(dev, |
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"oscillator discontinuity flagged, " |
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"time unreliable\n"); |
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stat &= ~(DS3232_REG_SR_OSF | DS3232_REG_SR_A1F | DS3232_REG_SR_A2F); |
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|
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ret = regmap_write(ds3232->regmap, DS3232_REG_SR, stat); |
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if (ret) |
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return ret; |
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|
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/* If the alarm is pending, clear it before requesting |
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* the interrupt, so an interrupt event isn't reported |
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* before everything is initialized. |
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*/ |
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ret = regmap_read(ds3232->regmap, DS3232_REG_CR, &control); |
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if (ret) |
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return ret; |
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control &= ~(DS3232_REG_CR_A1IE | DS3232_REG_CR_A2IE); |
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control |= DS3232_REG_CR_INTCN; |
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return regmap_write(ds3232->regmap, DS3232_REG_CR, control); |
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} |
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|
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static int ds3232_read_time(struct device *dev, struct rtc_time *time) |
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{ |
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struct ds3232 *ds3232 = dev_get_drvdata(dev); |
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int ret; |
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u8 buf[7]; |
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unsigned int year, month, day, hour, minute, second; |
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unsigned int week, twelve_hr, am_pm; |
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unsigned int century, add_century = 0; |
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|
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ret = regmap_bulk_read(ds3232->regmap, DS3232_REG_SECONDS, buf, 7); |
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if (ret) |
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return ret; |
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|
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second = buf[0]; |
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minute = buf[1]; |
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hour = buf[2]; |
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week = buf[3]; |
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day = buf[4]; |
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month = buf[5]; |
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year = buf[6]; |
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|
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/* Extract additional information for AM/PM and century */ |
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twelve_hr = hour & 0x40; |
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am_pm = hour & 0x20; |
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century = month & 0x80; |
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|
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/* Write to rtc_time structure */ |
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|
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time->tm_sec = bcd2bin(second); |
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time->tm_min = bcd2bin(minute); |
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if (twelve_hr) { |
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/* Convert to 24 hr */ |
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if (am_pm) |
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time->tm_hour = bcd2bin(hour & 0x1F) + 12; |
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else |
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time->tm_hour = bcd2bin(hour & 0x1F); |
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} else { |
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time->tm_hour = bcd2bin(hour); |
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} |
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/* Day of the week in linux range is 0~6 while 1~7 in RTC chip */ |
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time->tm_wday = bcd2bin(week) - 1; |
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time->tm_mday = bcd2bin(day); |
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/* linux tm_mon range:0~11, while month range is 1~12 in RTC chip */ |
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time->tm_mon = bcd2bin(month & 0x7F) - 1; |
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if (century) |
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add_century = 100; |
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time->tm_year = bcd2bin(year) + add_century; |
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|
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return 0; |
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} |
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|
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static int ds3232_set_time(struct device *dev, struct rtc_time *time) |
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{ |
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struct ds3232 *ds3232 = dev_get_drvdata(dev); |
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u8 buf[7]; |
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|
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/* Extract time from rtc_time and load into ds3232*/ |
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|
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buf[0] = bin2bcd(time->tm_sec); |
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buf[1] = bin2bcd(time->tm_min); |
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buf[2] = bin2bcd(time->tm_hour); |
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/* Day of the week in linux range is 0~6 while 1~7 in RTC chip */ |
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buf[3] = bin2bcd(time->tm_wday + 1); |
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buf[4] = bin2bcd(time->tm_mday); /* Date */ |
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/* linux tm_mon range:0~11, while month range is 1~12 in RTC chip */ |
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buf[5] = bin2bcd(time->tm_mon + 1); |
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if (time->tm_year >= 100) { |
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buf[5] |= 0x80; |
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buf[6] = bin2bcd(time->tm_year - 100); |
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} else { |
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buf[6] = bin2bcd(time->tm_year); |
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} |
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return regmap_bulk_write(ds3232->regmap, DS3232_REG_SECONDS, buf, 7); |
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} |
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|
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/* |
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* DS3232 has two alarm, we only use alarm1 |
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* According to linux specification, only support one-shot alarm |
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* no periodic alarm mode |
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*/ |
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static int ds3232_read_alarm(struct device *dev, struct rtc_wkalrm *alarm) |
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{ |
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struct ds3232 *ds3232 = dev_get_drvdata(dev); |
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int control, stat; |
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int ret; |
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u8 buf[4]; |
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|
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ret = regmap_read(ds3232->regmap, DS3232_REG_SR, &stat); |
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if (ret) |
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goto out; |
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ret = regmap_read(ds3232->regmap, DS3232_REG_CR, &control); |
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if (ret) |
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goto out; |
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ret = regmap_bulk_read(ds3232->regmap, DS3232_REG_ALARM1, buf, 4); |
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if (ret) |
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goto out; |
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alarm->time.tm_sec = bcd2bin(buf[0] & 0x7F); |
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alarm->time.tm_min = bcd2bin(buf[1] & 0x7F); |
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alarm->time.tm_hour = bcd2bin(buf[2] & 0x7F); |
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alarm->time.tm_mday = bcd2bin(buf[3] & 0x7F); |
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alarm->enabled = !!(control & DS3232_REG_CR_A1IE); |
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alarm->pending = !!(stat & DS3232_REG_SR_A1F); |
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ret = 0; |
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out: |
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return ret; |
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} |
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|
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/* |
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* linux rtc-module does not support wday alarm |
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* and only 24h time mode supported indeed |
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*/ |
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static int ds3232_set_alarm(struct device *dev, struct rtc_wkalrm *alarm) |
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{ |
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struct ds3232 *ds3232 = dev_get_drvdata(dev); |
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int control, stat; |
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int ret; |
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u8 buf[4]; |
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|
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if (ds3232->irq <= 0) |
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return -EINVAL; |
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|
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buf[0] = bin2bcd(alarm->time.tm_sec); |
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buf[1] = bin2bcd(alarm->time.tm_min); |
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buf[2] = bin2bcd(alarm->time.tm_hour); |
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buf[3] = bin2bcd(alarm->time.tm_mday); |
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|
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/* clear alarm interrupt enable bit */ |
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ret = regmap_read(ds3232->regmap, DS3232_REG_CR, &control); |
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if (ret) |
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goto out; |
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control &= ~(DS3232_REG_CR_A1IE | DS3232_REG_CR_A2IE); |
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ret = regmap_write(ds3232->regmap, DS3232_REG_CR, control); |
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if (ret) |
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goto out; |
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|
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/* clear any pending alarm flag */ |
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ret = regmap_read(ds3232->regmap, DS3232_REG_SR, &stat); |
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if (ret) |
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goto out; |
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stat &= ~(DS3232_REG_SR_A1F | DS3232_REG_SR_A2F); |
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ret = regmap_write(ds3232->regmap, DS3232_REG_SR, stat); |
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if (ret) |
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goto out; |
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|
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ret = regmap_bulk_write(ds3232->regmap, DS3232_REG_ALARM1, buf, 4); |
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if (ret) |
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goto out; |
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if (alarm->enabled) { |
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control |= DS3232_REG_CR_A1IE; |
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ret = regmap_write(ds3232->regmap, DS3232_REG_CR, control); |
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} |
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out: |
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return ret; |
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} |
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static int ds3232_update_alarm(struct device *dev, unsigned int enabled) |
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{ |
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struct ds3232 *ds3232 = dev_get_drvdata(dev); |
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int control; |
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int ret; |
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ret = regmap_read(ds3232->regmap, DS3232_REG_CR, &control); |
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if (ret) |
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return ret; |
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if (enabled) |
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/* enable alarm1 interrupt */ |
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control |= DS3232_REG_CR_A1IE; |
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else |
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/* disable alarm1 interrupt */ |
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control &= ~(DS3232_REG_CR_A1IE); |
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ret = regmap_write(ds3232->regmap, DS3232_REG_CR, control); |
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return ret; |
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} |
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/* |
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* Temperature sensor support for ds3232/ds3234 devices. |
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* A user-initiated temperature conversion is not started by this function, |
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* so the temperature is updated once every 64 seconds. |
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*/ |
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static int ds3232_hwmon_read_temp(struct device *dev, long int *mC) |
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{ |
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struct ds3232 *ds3232 = dev_get_drvdata(dev); |
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u8 temp_buf[2]; |
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s16 temp; |
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int ret; |
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|
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ret = regmap_bulk_read(ds3232->regmap, DS3232_REG_TEMPERATURE, temp_buf, |
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sizeof(temp_buf)); |
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if (ret < 0) |
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return ret; |
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/* |
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* Temperature is represented as a 10-bit code with a resolution of |
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* 0.25 degree celsius and encoded in two's complement format. |
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*/ |
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temp = (temp_buf[0] << 8) | temp_buf[1]; |
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temp >>= 6; |
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*mC = temp * 250; |
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return 0; |
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} |
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static umode_t ds3232_hwmon_is_visible(const void *data, |
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enum hwmon_sensor_types type, |
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u32 attr, int channel) |
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{ |
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if (type != hwmon_temp) |
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return 0; |
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switch (attr) { |
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case hwmon_temp_input: |
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return 0444; |
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default: |
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return 0; |
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} |
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} |
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|
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static int ds3232_hwmon_read(struct device *dev, |
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enum hwmon_sensor_types type, |
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u32 attr, int channel, long *temp) |
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{ |
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int err; |
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|
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switch (attr) { |
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case hwmon_temp_input: |
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err = ds3232_hwmon_read_temp(dev, temp); |
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break; |
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default: |
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err = -EOPNOTSUPP; |
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break; |
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} |
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|
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return err; |
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} |
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|
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static u32 ds3232_hwmon_chip_config[] = { |
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HWMON_C_REGISTER_TZ, |
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0 |
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}; |
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|
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static const struct hwmon_channel_info ds3232_hwmon_chip = { |
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.type = hwmon_chip, |
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.config = ds3232_hwmon_chip_config, |
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}; |
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|
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static u32 ds3232_hwmon_temp_config[] = { |
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HWMON_T_INPUT, |
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0 |
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}; |
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|
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static const struct hwmon_channel_info ds3232_hwmon_temp = { |
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.type = hwmon_temp, |
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.config = ds3232_hwmon_temp_config, |
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}; |
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static const struct hwmon_channel_info *ds3232_hwmon_info[] = { |
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&ds3232_hwmon_chip, |
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&ds3232_hwmon_temp, |
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NULL |
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}; |
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static const struct hwmon_ops ds3232_hwmon_hwmon_ops = { |
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.is_visible = ds3232_hwmon_is_visible, |
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.read = ds3232_hwmon_read, |
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}; |
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|
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static const struct hwmon_chip_info ds3232_hwmon_chip_info = { |
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.ops = &ds3232_hwmon_hwmon_ops, |
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.info = ds3232_hwmon_info, |
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}; |
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|
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static void ds3232_hwmon_register(struct device *dev, const char *name) |
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{ |
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struct ds3232 *ds3232 = dev_get_drvdata(dev); |
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struct device *hwmon_dev; |
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|
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if (!IS_ENABLED(CONFIG_RTC_DRV_DS3232_HWMON)) |
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return; |
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hwmon_dev = devm_hwmon_device_register_with_info(dev, name, ds3232, |
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&ds3232_hwmon_chip_info, |
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NULL); |
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if (IS_ERR(hwmon_dev)) { |
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dev_err(dev, "unable to register hwmon device %ld\n", |
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PTR_ERR(hwmon_dev)); |
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} |
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} |
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|
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static int ds3232_alarm_irq_enable(struct device *dev, unsigned int enabled) |
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{ |
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struct ds3232 *ds3232 = dev_get_drvdata(dev); |
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|
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if (ds3232->irq <= 0) |
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return -EINVAL; |
|
|
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return ds3232_update_alarm(dev, enabled); |
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} |
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static irqreturn_t ds3232_irq(int irq, void *dev_id) |
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{ |
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struct device *dev = dev_id; |
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struct ds3232 *ds3232 = dev_get_drvdata(dev); |
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int ret; |
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int stat, control; |
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|
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rtc_lock(ds3232->rtc); |
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ret = regmap_read(ds3232->regmap, DS3232_REG_SR, &stat); |
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if (ret) |
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goto unlock; |
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if (stat & DS3232_REG_SR_A1F) { |
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ret = regmap_read(ds3232->regmap, DS3232_REG_CR, &control); |
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if (ret) { |
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dev_warn(ds3232->dev, |
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"Read Control Register error %d\n", ret); |
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} else { |
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/* disable alarm1 interrupt */ |
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control &= ~(DS3232_REG_CR_A1IE); |
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ret = regmap_write(ds3232->regmap, DS3232_REG_CR, |
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control); |
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if (ret) { |
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dev_warn(ds3232->dev, |
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"Write Control Register error %d\n", |
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ret); |
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goto unlock; |
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} |
|
|
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/* clear the alarm pend flag */ |
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stat &= ~DS3232_REG_SR_A1F; |
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ret = regmap_write(ds3232->regmap, DS3232_REG_SR, stat); |
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if (ret) { |
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dev_warn(ds3232->dev, |
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"Write Status Register error %d\n", |
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ret); |
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goto unlock; |
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} |
|
|
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rtc_update_irq(ds3232->rtc, 1, RTC_AF | RTC_IRQF); |
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} |
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} |
|
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unlock: |
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rtc_unlock(ds3232->rtc); |
|
|
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return IRQ_HANDLED; |
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} |
|
|
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static const struct rtc_class_ops ds3232_rtc_ops = { |
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.read_time = ds3232_read_time, |
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.set_time = ds3232_set_time, |
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.read_alarm = ds3232_read_alarm, |
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.set_alarm = ds3232_set_alarm, |
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.alarm_irq_enable = ds3232_alarm_irq_enable, |
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}; |
|
|
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static int ds3232_nvmem_read(void *priv, unsigned int offset, void *val, |
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size_t bytes) |
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{ |
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struct regmap *ds3232_regmap = (struct regmap *)priv; |
|
|
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return regmap_bulk_read(ds3232_regmap, DS3232_REG_SRAM_START + offset, |
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val, bytes); |
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} |
|
|
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static int ds3232_nvmem_write(void *priv, unsigned int offset, void *val, |
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size_t bytes) |
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{ |
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struct regmap *ds3232_regmap = (struct regmap *)priv; |
|
|
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return regmap_bulk_write(ds3232_regmap, DS3232_REG_SRAM_START + offset, |
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val, bytes); |
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} |
|
|
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static int ds3232_probe(struct device *dev, struct regmap *regmap, int irq, |
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const char *name) |
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{ |
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struct ds3232 *ds3232; |
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int ret; |
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struct nvmem_config nvmem_cfg = { |
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.name = "ds3232_sram", |
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.stride = 1, |
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.size = DS3232_REG_SRAM_SIZE, |
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.word_size = 1, |
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.reg_read = ds3232_nvmem_read, |
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.reg_write = ds3232_nvmem_write, |
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.priv = regmap, |
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.type = NVMEM_TYPE_BATTERY_BACKED |
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}; |
|
|
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ds3232 = devm_kzalloc(dev, sizeof(*ds3232), GFP_KERNEL); |
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if (!ds3232) |
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return -ENOMEM; |
|
|
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ds3232->regmap = regmap; |
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ds3232->irq = irq; |
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ds3232->dev = dev; |
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dev_set_drvdata(dev, ds3232); |
|
|
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ret = ds3232_check_rtc_status(dev); |
|
if (ret) |
|
return ret; |
|
|
|
if (ds3232->irq > 0) |
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device_init_wakeup(dev, 1); |
|
|
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ds3232_hwmon_register(dev, name); |
|
|
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ds3232->rtc = devm_rtc_device_register(dev, name, &ds3232_rtc_ops, |
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THIS_MODULE); |
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if (IS_ERR(ds3232->rtc)) |
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return PTR_ERR(ds3232->rtc); |
|
|
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ret = devm_rtc_nvmem_register(ds3232->rtc, &nvmem_cfg); |
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if(ret) |
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return ret; |
|
|
|
if (ds3232->irq > 0) { |
|
ret = devm_request_threaded_irq(dev, ds3232->irq, NULL, |
|
ds3232_irq, |
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IRQF_SHARED | IRQF_ONESHOT, |
|
name, dev); |
|
if (ret) { |
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device_set_wakeup_capable(dev, 0); |
|
ds3232->irq = 0; |
|
dev_err(dev, "unable to request IRQ\n"); |
|
} |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
#ifdef CONFIG_PM_SLEEP |
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static int ds3232_suspend(struct device *dev) |
|
{ |
|
struct ds3232 *ds3232 = dev_get_drvdata(dev); |
|
|
|
if (device_may_wakeup(dev)) { |
|
if (enable_irq_wake(ds3232->irq)) |
|
dev_warn_once(dev, "Cannot set wakeup source\n"); |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int ds3232_resume(struct device *dev) |
|
{ |
|
struct ds3232 *ds3232 = dev_get_drvdata(dev); |
|
|
|
if (device_may_wakeup(dev)) |
|
disable_irq_wake(ds3232->irq); |
|
|
|
return 0; |
|
} |
|
#endif |
|
|
|
static const struct dev_pm_ops ds3232_pm_ops = { |
|
SET_SYSTEM_SLEEP_PM_OPS(ds3232_suspend, ds3232_resume) |
|
}; |
|
|
|
#if IS_ENABLED(CONFIG_I2C) |
|
|
|
static int ds3232_i2c_probe(struct i2c_client *client, |
|
const struct i2c_device_id *id) |
|
{ |
|
struct regmap *regmap; |
|
static const struct regmap_config config = { |
|
.reg_bits = 8, |
|
.val_bits = 8, |
|
.max_register = DS3232_REG_SRAM_END, |
|
}; |
|
|
|
regmap = devm_regmap_init_i2c(client, &config); |
|
if (IS_ERR(regmap)) { |
|
dev_err(&client->dev, "%s: regmap allocation failed: %ld\n", |
|
__func__, PTR_ERR(regmap)); |
|
return PTR_ERR(regmap); |
|
} |
|
|
|
return ds3232_probe(&client->dev, regmap, client->irq, client->name); |
|
} |
|
|
|
static const struct i2c_device_id ds3232_id[] = { |
|
{ "ds3232", 0 }, |
|
{ } |
|
}; |
|
MODULE_DEVICE_TABLE(i2c, ds3232_id); |
|
|
|
static const __maybe_unused struct of_device_id ds3232_of_match[] = { |
|
{ .compatible = "dallas,ds3232" }, |
|
{ } |
|
}; |
|
MODULE_DEVICE_TABLE(of, ds3232_of_match); |
|
|
|
static struct i2c_driver ds3232_driver = { |
|
.driver = { |
|
.name = "rtc-ds3232", |
|
.of_match_table = of_match_ptr(ds3232_of_match), |
|
.pm = &ds3232_pm_ops, |
|
}, |
|
.probe = ds3232_i2c_probe, |
|
.id_table = ds3232_id, |
|
}; |
|
|
|
static int ds3232_register_driver(void) |
|
{ |
|
return i2c_add_driver(&ds3232_driver); |
|
} |
|
|
|
static void ds3232_unregister_driver(void) |
|
{ |
|
i2c_del_driver(&ds3232_driver); |
|
} |
|
|
|
#else |
|
|
|
static int ds3232_register_driver(void) |
|
{ |
|
return 0; |
|
} |
|
|
|
static void ds3232_unregister_driver(void) |
|
{ |
|
} |
|
|
|
#endif |
|
|
|
#if IS_ENABLED(CONFIG_SPI_MASTER) |
|
|
|
static int ds3234_probe(struct spi_device *spi) |
|
{ |
|
int res; |
|
unsigned int tmp; |
|
static const struct regmap_config config = { |
|
.reg_bits = 8, |
|
.val_bits = 8, |
|
.max_register = DS3232_REG_SRAM_END, |
|
.write_flag_mask = 0x80, |
|
}; |
|
struct regmap *regmap; |
|
|
|
regmap = devm_regmap_init_spi(spi, &config); |
|
if (IS_ERR(regmap)) { |
|
dev_err(&spi->dev, "%s: regmap allocation failed: %ld\n", |
|
__func__, PTR_ERR(regmap)); |
|
return PTR_ERR(regmap); |
|
} |
|
|
|
spi->mode = SPI_MODE_3; |
|
spi->bits_per_word = 8; |
|
spi_setup(spi); |
|
|
|
res = regmap_read(regmap, DS3232_REG_SECONDS, &tmp); |
|
if (res) |
|
return res; |
|
|
|
/* Control settings |
|
* |
|
* CONTROL_REG |
|
* BIT 7 6 5 4 3 2 1 0 |
|
* EOSC BBSQW CONV RS2 RS1 INTCN A2IE A1IE |
|
* |
|
* 0 0 0 1 1 1 0 0 |
|
* |
|
* CONTROL_STAT_REG |
|
* BIT 7 6 5 4 3 2 1 0 |
|
* OSF BB32kHz CRATE1 CRATE0 EN32kHz BSY A2F A1F |
|
* |
|
* 1 0 0 0 1 0 0 0 |
|
*/ |
|
res = regmap_read(regmap, DS3232_REG_CR, &tmp); |
|
if (res) |
|
return res; |
|
res = regmap_write(regmap, DS3232_REG_CR, tmp & 0x1c); |
|
if (res) |
|
return res; |
|
|
|
res = regmap_read(regmap, DS3232_REG_SR, &tmp); |
|
if (res) |
|
return res; |
|
res = regmap_write(regmap, DS3232_REG_SR, tmp & 0x88); |
|
if (res) |
|
return res; |
|
|
|
/* Print our settings */ |
|
res = regmap_read(regmap, DS3232_REG_CR, &tmp); |
|
if (res) |
|
return res; |
|
dev_info(&spi->dev, "Control Reg: 0x%02x\n", tmp); |
|
|
|
res = regmap_read(regmap, DS3232_REG_SR, &tmp); |
|
if (res) |
|
return res; |
|
dev_info(&spi->dev, "Ctrl/Stat Reg: 0x%02x\n", tmp); |
|
|
|
return ds3232_probe(&spi->dev, regmap, spi->irq, "ds3234"); |
|
} |
|
|
|
static struct spi_driver ds3234_driver = { |
|
.driver = { |
|
.name = "ds3234", |
|
}, |
|
.probe = ds3234_probe, |
|
}; |
|
|
|
static int ds3234_register_driver(void) |
|
{ |
|
return spi_register_driver(&ds3234_driver); |
|
} |
|
|
|
static void ds3234_unregister_driver(void) |
|
{ |
|
spi_unregister_driver(&ds3234_driver); |
|
} |
|
|
|
#else |
|
|
|
static int ds3234_register_driver(void) |
|
{ |
|
return 0; |
|
} |
|
|
|
static void ds3234_unregister_driver(void) |
|
{ |
|
} |
|
|
|
#endif |
|
|
|
static int __init ds323x_init(void) |
|
{ |
|
int ret; |
|
|
|
ret = ds3232_register_driver(); |
|
if (ret) { |
|
pr_err("Failed to register ds3232 driver: %d\n", ret); |
|
return ret; |
|
} |
|
|
|
ret = ds3234_register_driver(); |
|
if (ret) { |
|
pr_err("Failed to register ds3234 driver: %d\n", ret); |
|
ds3232_unregister_driver(); |
|
} |
|
|
|
return ret; |
|
} |
|
module_init(ds323x_init) |
|
|
|
static void __exit ds323x_exit(void) |
|
{ |
|
ds3234_unregister_driver(); |
|
ds3232_unregister_driver(); |
|
} |
|
module_exit(ds323x_exit) |
|
|
|
MODULE_AUTHOR("Srikanth Srinivasan <[email protected]>"); |
|
MODULE_AUTHOR("Dennis Aberilla <[email protected]>"); |
|
MODULE_DESCRIPTION("Maxim/Dallas DS3232/DS3234 RTC Driver"); |
|
MODULE_LICENSE("GPL"); |
|
MODULE_ALIAS("spi:ds3234");
|
|
|