v4.19.13 snapshot.
diff --git a/drivers/rtc/rtc-ds3232.c b/drivers/rtc/rtc-ds3232.c
new file mode 100644
index 0000000..7184e51
--- /dev/null
+++ b/drivers/rtc/rtc-ds3232.c
@@ -0,0 +1,735 @@
+/*
+ * RTC client/driver for the Maxim/Dallas DS3232/DS3234 Real-Time Clock
+ *
+ * Copyright (C) 2009-2011 Freescale Semiconductor.
+ * Author: Jack Lan <jack.lan@freescale.com>
+ * Copyright (C) 2008 MIMOMax Wireless Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/i2c.h>
+#include <linux/spi/spi.h>
+#include <linux/rtc.h>
+#include <linux/bcd.h>
+#include <linux/slab.h>
+#include <linux/regmap.h>
+#include <linux/hwmon.h>
+
+#define DS3232_REG_SECONDS 0x00
+#define DS3232_REG_MINUTES 0x01
+#define DS3232_REG_HOURS 0x02
+#define DS3232_REG_AMPM 0x02
+#define DS3232_REG_DAY 0x03
+#define DS3232_REG_DATE 0x04
+#define DS3232_REG_MONTH 0x05
+#define DS3232_REG_CENTURY 0x05
+#define DS3232_REG_YEAR 0x06
+#define DS3232_REG_ALARM1 0x07 /* Alarm 1 BASE */
+#define DS3232_REG_ALARM2 0x0B /* Alarm 2 BASE */
+#define DS3232_REG_CR 0x0E /* Control register */
+# define DS3232_REG_CR_nEOSC 0x80
+# define DS3232_REG_CR_INTCN 0x04
+# define DS3232_REG_CR_A2IE 0x02
+# define DS3232_REG_CR_A1IE 0x01
+
+#define DS3232_REG_SR 0x0F /* control/status register */
+# define DS3232_REG_SR_OSF 0x80
+# define DS3232_REG_SR_BSY 0x04
+# define DS3232_REG_SR_A2F 0x02
+# define DS3232_REG_SR_A1F 0x01
+
+#define DS3232_REG_TEMPERATURE 0x11
+
+struct ds3232 {
+ struct device *dev;
+ struct regmap *regmap;
+ int irq;
+ struct rtc_device *rtc;
+
+ bool suspended;
+};
+
+static int ds3232_check_rtc_status(struct device *dev)
+{
+ struct ds3232 *ds3232 = dev_get_drvdata(dev);
+ int ret = 0;
+ int control, stat;
+
+ ret = regmap_read(ds3232->regmap, DS3232_REG_SR, &stat);
+ if (ret)
+ return ret;
+
+ if (stat & DS3232_REG_SR_OSF)
+ dev_warn(dev,
+ "oscillator discontinuity flagged, "
+ "time unreliable\n");
+
+ stat &= ~(DS3232_REG_SR_OSF | DS3232_REG_SR_A1F | DS3232_REG_SR_A2F);
+
+ ret = regmap_write(ds3232->regmap, DS3232_REG_SR, stat);
+ if (ret)
+ return ret;
+
+ /* If the alarm is pending, clear it before requesting
+ * the interrupt, so an interrupt event isn't reported
+ * before everything is initialized.
+ */
+
+ ret = regmap_read(ds3232->regmap, DS3232_REG_CR, &control);
+ if (ret)
+ return ret;
+
+ control &= ~(DS3232_REG_CR_A1IE | DS3232_REG_CR_A2IE);
+ control |= DS3232_REG_CR_INTCN;
+
+ return regmap_write(ds3232->regmap, DS3232_REG_CR, control);
+}
+
+static int ds3232_read_time(struct device *dev, struct rtc_time *time)
+{
+ struct ds3232 *ds3232 = dev_get_drvdata(dev);
+ int ret;
+ u8 buf[7];
+ unsigned int year, month, day, hour, minute, second;
+ unsigned int week, twelve_hr, am_pm;
+ unsigned int century, add_century = 0;
+
+ ret = regmap_bulk_read(ds3232->regmap, DS3232_REG_SECONDS, buf, 7);
+ if (ret)
+ return ret;
+
+ second = buf[0];
+ minute = buf[1];
+ hour = buf[2];
+ week = buf[3];
+ day = buf[4];
+ month = buf[5];
+ year = buf[6];
+
+ /* Extract additional information for AM/PM and century */
+
+ twelve_hr = hour & 0x40;
+ am_pm = hour & 0x20;
+ century = month & 0x80;
+
+ /* Write to rtc_time structure */
+
+ time->tm_sec = bcd2bin(second);
+ time->tm_min = bcd2bin(minute);
+ if (twelve_hr) {
+ /* Convert to 24 hr */
+ if (am_pm)
+ time->tm_hour = bcd2bin(hour & 0x1F) + 12;
+ else
+ time->tm_hour = bcd2bin(hour & 0x1F);
+ } else {
+ time->tm_hour = bcd2bin(hour);
+ }
+
+ /* Day of the week in linux range is 0~6 while 1~7 in RTC chip */
+ time->tm_wday = bcd2bin(week) - 1;
+ time->tm_mday = bcd2bin(day);
+ /* linux tm_mon range:0~11, while month range is 1~12 in RTC chip */
+ time->tm_mon = bcd2bin(month & 0x7F) - 1;
+ if (century)
+ add_century = 100;
+
+ time->tm_year = bcd2bin(year) + add_century;
+
+ return 0;
+}
+
+static int ds3232_set_time(struct device *dev, struct rtc_time *time)
+{
+ struct ds3232 *ds3232 = dev_get_drvdata(dev);
+ u8 buf[7];
+
+ /* Extract time from rtc_time and load into ds3232*/
+
+ buf[0] = bin2bcd(time->tm_sec);
+ buf[1] = bin2bcd(time->tm_min);
+ buf[2] = bin2bcd(time->tm_hour);
+ /* Day of the week in linux range is 0~6 while 1~7 in RTC chip */
+ buf[3] = bin2bcd(time->tm_wday + 1);
+ buf[4] = bin2bcd(time->tm_mday); /* Date */
+ /* linux tm_mon range:0~11, while month range is 1~12 in RTC chip */
+ buf[5] = bin2bcd(time->tm_mon + 1);
+ if (time->tm_year >= 100) {
+ buf[5] |= 0x80;
+ buf[6] = bin2bcd(time->tm_year - 100);
+ } else {
+ buf[6] = bin2bcd(time->tm_year);
+ }
+
+ return regmap_bulk_write(ds3232->regmap, DS3232_REG_SECONDS, buf, 7);
+}
+
+/*
+ * DS3232 has two alarm, we only use alarm1
+ * According to linux specification, only support one-shot alarm
+ * no periodic alarm mode
+ */
+static int ds3232_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
+{
+ struct ds3232 *ds3232 = dev_get_drvdata(dev);
+ int control, stat;
+ int ret;
+ u8 buf[4];
+
+ ret = regmap_read(ds3232->regmap, DS3232_REG_SR, &stat);
+ if (ret)
+ goto out;
+ ret = regmap_read(ds3232->regmap, DS3232_REG_CR, &control);
+ if (ret)
+ goto out;
+ ret = regmap_bulk_read(ds3232->regmap, DS3232_REG_ALARM1, buf, 4);
+ if (ret)
+ goto out;
+
+ alarm->time.tm_sec = bcd2bin(buf[0] & 0x7F);
+ alarm->time.tm_min = bcd2bin(buf[1] & 0x7F);
+ alarm->time.tm_hour = bcd2bin(buf[2] & 0x7F);
+ alarm->time.tm_mday = bcd2bin(buf[3] & 0x7F);
+
+ alarm->enabled = !!(control & DS3232_REG_CR_A1IE);
+ alarm->pending = !!(stat & DS3232_REG_SR_A1F);
+
+ ret = 0;
+out:
+ return ret;
+}
+
+/*
+ * linux rtc-module does not support wday alarm
+ * and only 24h time mode supported indeed
+ */
+static int ds3232_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
+{
+ struct ds3232 *ds3232 = dev_get_drvdata(dev);
+ int control, stat;
+ int ret;
+ u8 buf[4];
+
+ if (ds3232->irq <= 0)
+ return -EINVAL;
+
+ buf[0] = bin2bcd(alarm->time.tm_sec);
+ buf[1] = bin2bcd(alarm->time.tm_min);
+ buf[2] = bin2bcd(alarm->time.tm_hour);
+ buf[3] = bin2bcd(alarm->time.tm_mday);
+
+ /* clear alarm interrupt enable bit */
+ ret = regmap_read(ds3232->regmap, DS3232_REG_CR, &control);
+ if (ret)
+ goto out;
+ control &= ~(DS3232_REG_CR_A1IE | DS3232_REG_CR_A2IE);
+ ret = regmap_write(ds3232->regmap, DS3232_REG_CR, control);
+ if (ret)
+ goto out;
+
+ /* clear any pending alarm flag */
+ ret = regmap_read(ds3232->regmap, DS3232_REG_SR, &stat);
+ if (ret)
+ goto out;
+ stat &= ~(DS3232_REG_SR_A1F | DS3232_REG_SR_A2F);
+ ret = regmap_write(ds3232->regmap, DS3232_REG_SR, stat);
+ if (ret)
+ goto out;
+
+ ret = regmap_bulk_write(ds3232->regmap, DS3232_REG_ALARM1, buf, 4);
+ if (ret)
+ goto out;
+
+ if (alarm->enabled) {
+ control |= DS3232_REG_CR_A1IE;
+ ret = regmap_write(ds3232->regmap, DS3232_REG_CR, control);
+ }
+out:
+ return ret;
+}
+
+static int ds3232_update_alarm(struct device *dev, unsigned int enabled)
+{
+ struct ds3232 *ds3232 = dev_get_drvdata(dev);
+ int control;
+ int ret;
+
+ ret = regmap_read(ds3232->regmap, DS3232_REG_CR, &control);
+ if (ret)
+ return ret;
+
+ if (enabled)
+ /* enable alarm1 interrupt */
+ control |= DS3232_REG_CR_A1IE;
+ else
+ /* disable alarm1 interrupt */
+ control &= ~(DS3232_REG_CR_A1IE);
+ ret = regmap_write(ds3232->regmap, DS3232_REG_CR, control);
+
+ return ret;
+}
+
+/*
+ * Temperature sensor support for ds3232/ds3234 devices.
+ * A user-initiated temperature conversion is not started by this function,
+ * so the temperature is updated once every 64 seconds.
+ */
+static int ds3232_hwmon_read_temp(struct device *dev, long int *mC)
+{
+ struct ds3232 *ds3232 = dev_get_drvdata(dev);
+ u8 temp_buf[2];
+ s16 temp;
+ int ret;
+
+ ret = regmap_bulk_read(ds3232->regmap, DS3232_REG_TEMPERATURE, temp_buf,
+ sizeof(temp_buf));
+ if (ret < 0)
+ return ret;
+
+ /*
+ * Temperature is represented as a 10-bit code with a resolution of
+ * 0.25 degree celsius and encoded in two's complement format.
+ */
+ temp = (temp_buf[0] << 8) | temp_buf[1];
+ temp >>= 6;
+ *mC = temp * 250;
+
+ return 0;
+}
+
+static umode_t ds3232_hwmon_is_visible(const void *data,
+ enum hwmon_sensor_types type,
+ u32 attr, int channel)
+{
+ if (type != hwmon_temp)
+ return 0;
+
+ switch (attr) {
+ case hwmon_temp_input:
+ return 0444;
+ default:
+ return 0;
+ }
+}
+
+static int ds3232_hwmon_read(struct device *dev,
+ enum hwmon_sensor_types type,
+ u32 attr, int channel, long *temp)
+{
+ int err;
+
+ switch (attr) {
+ case hwmon_temp_input:
+ err = ds3232_hwmon_read_temp(dev, temp);
+ break;
+ default:
+ err = -EOPNOTSUPP;
+ break;
+ }
+
+ return err;
+}
+
+static u32 ds3232_hwmon_chip_config[] = {
+ HWMON_C_REGISTER_TZ,
+ 0
+};
+
+static const struct hwmon_channel_info ds3232_hwmon_chip = {
+ .type = hwmon_chip,
+ .config = ds3232_hwmon_chip_config,
+};
+
+static u32 ds3232_hwmon_temp_config[] = {
+ HWMON_T_INPUT,
+ 0
+};
+
+static const struct hwmon_channel_info ds3232_hwmon_temp = {
+ .type = hwmon_temp,
+ .config = ds3232_hwmon_temp_config,
+};
+
+static const struct hwmon_channel_info *ds3232_hwmon_info[] = {
+ &ds3232_hwmon_chip,
+ &ds3232_hwmon_temp,
+ NULL
+};
+
+static const struct hwmon_ops ds3232_hwmon_hwmon_ops = {
+ .is_visible = ds3232_hwmon_is_visible,
+ .read = ds3232_hwmon_read,
+};
+
+static const struct hwmon_chip_info ds3232_hwmon_chip_info = {
+ .ops = &ds3232_hwmon_hwmon_ops,
+ .info = ds3232_hwmon_info,
+};
+
+static void ds3232_hwmon_register(struct device *dev, const char *name)
+{
+ struct ds3232 *ds3232 = dev_get_drvdata(dev);
+ struct device *hwmon_dev;
+
+ if (!IS_ENABLED(CONFIG_RTC_DRV_DS3232_HWMON))
+ return;
+
+ hwmon_dev = devm_hwmon_device_register_with_info(dev, name, ds3232,
+ &ds3232_hwmon_chip_info,
+ NULL);
+ if (IS_ERR(hwmon_dev)) {
+ dev_err(dev, "unable to register hwmon device %ld\n",
+ PTR_ERR(hwmon_dev));
+ }
+}
+
+static int ds3232_alarm_irq_enable(struct device *dev, unsigned int enabled)
+{
+ struct ds3232 *ds3232 = dev_get_drvdata(dev);
+
+ if (ds3232->irq <= 0)
+ return -EINVAL;
+
+ return ds3232_update_alarm(dev, enabled);
+}
+
+static irqreturn_t ds3232_irq(int irq, void *dev_id)
+{
+ struct device *dev = dev_id;
+ struct ds3232 *ds3232 = dev_get_drvdata(dev);
+ struct mutex *lock = &ds3232->rtc->ops_lock;
+ int ret;
+ int stat, control;
+
+ mutex_lock(lock);
+
+ ret = regmap_read(ds3232->regmap, DS3232_REG_SR, &stat);
+ if (ret)
+ goto unlock;
+
+ if (stat & DS3232_REG_SR_A1F) {
+ ret = regmap_read(ds3232->regmap, DS3232_REG_CR, &control);
+ if (ret) {
+ dev_warn(ds3232->dev,
+ "Read Control Register error %d\n", ret);
+ } else {
+ /* disable alarm1 interrupt */
+ control &= ~(DS3232_REG_CR_A1IE);
+ ret = regmap_write(ds3232->regmap, DS3232_REG_CR,
+ control);
+ if (ret) {
+ dev_warn(ds3232->dev,
+ "Write Control Register error %d\n",
+ ret);
+ goto unlock;
+ }
+
+ /* clear the alarm pend flag */
+ stat &= ~DS3232_REG_SR_A1F;
+ ret = regmap_write(ds3232->regmap, DS3232_REG_SR, stat);
+ if (ret) {
+ dev_warn(ds3232->dev,
+ "Write Status Register error %d\n",
+ ret);
+ goto unlock;
+ }
+
+ rtc_update_irq(ds3232->rtc, 1, RTC_AF | RTC_IRQF);
+ }
+ }
+
+unlock:
+ mutex_unlock(lock);
+
+ return IRQ_HANDLED;
+}
+
+static const struct rtc_class_ops ds3232_rtc_ops = {
+ .read_time = ds3232_read_time,
+ .set_time = ds3232_set_time,
+ .read_alarm = ds3232_read_alarm,
+ .set_alarm = ds3232_set_alarm,
+ .alarm_irq_enable = ds3232_alarm_irq_enable,
+};
+
+static int ds3232_probe(struct device *dev, struct regmap *regmap, int irq,
+ const char *name)
+{
+ struct ds3232 *ds3232;
+ int ret;
+
+ ds3232 = devm_kzalloc(dev, sizeof(*ds3232), GFP_KERNEL);
+ if (!ds3232)
+ return -ENOMEM;
+
+ ds3232->regmap = regmap;
+ ds3232->irq = irq;
+ ds3232->dev = dev;
+ dev_set_drvdata(dev, ds3232);
+
+ ret = ds3232_check_rtc_status(dev);
+ if (ret)
+ return ret;
+
+ if (ds3232->irq > 0)
+ device_init_wakeup(dev, 1);
+
+ ds3232_hwmon_register(dev, name);
+
+ ds3232->rtc = devm_rtc_device_register(dev, name, &ds3232_rtc_ops,
+ THIS_MODULE);
+ if (IS_ERR(ds3232->rtc))
+ return PTR_ERR(ds3232->rtc);
+
+ if (ds3232->irq > 0) {
+ ret = devm_request_threaded_irq(dev, ds3232->irq, NULL,
+ ds3232_irq,
+ IRQF_SHARED | IRQF_ONESHOT,
+ name, dev);
+ if (ret) {
+ device_set_wakeup_capable(dev, 0);
+ ds3232->irq = 0;
+ dev_err(dev, "unable to request IRQ\n");
+ }
+ }
+
+ return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+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 = 0x13,
+ };
+
+ 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 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 = 0x13,
+ .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 <srikanth.srinivasan@freescale.com>");
+MODULE_AUTHOR("Dennis Aberilla <denzzzhome@yahoo.com>");
+MODULE_DESCRIPTION("Maxim/Dallas DS3232/DS3234 RTC Driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("spi:ds3234");