@@ -59,6 +59,7 @@ obj-$(CONFIG_RTC_DRV_DS1685_FAMILY) += rtc-ds1685.o
obj-$(CONFIG_RTC_DRV_DS1742) += rtc-ds1742.o
obj-$(CONFIG_RTC_DRV_DS2404) += rtc-ds2404.o
obj-$(CONFIG_RTC_DRV_DS3232) += rtc-ds3232.o
+rtc-ds3232-objs := rtc-ds3232-core.o
obj-$(CONFIG_RTC_DRV_DS3234) += rtc-ds3234.o
obj-$(CONFIG_RTC_DRV_EFI) += rtc-efi.o
obj-$(CONFIG_RTC_DRV_EM3027) += rtc-em3027.o
new file mode 100644
@@ -0,0 +1,517 @@
+/*
+ * RTC client/driver for the Maxim/Dallas DS3232 Real-Time Clock over I2C
+ *
+ * Copyright (C) 2009-2011 Freescale Semiconductor.
+ * Author: Jack Lan <jack.lan@freescale.com>
+ *
+ * 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.
+ */
+/*
+ * It would be more efficient to use i2c msgs/i2c_transfer directly but, as
+ * recommened in .../Documentation/i2c/writing-clients section
+ * "Sending and receiving", using SMBus level communication is preferred.
+ */
+
+#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/rtc.h>
+#include <linux/bcd.h>
+#include <linux/workqueue.h>
+#include <linux/slab.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
+
+struct ds3232 {
+ struct i2c_client *client;
+ struct rtc_device *rtc;
+ struct work_struct work;
+
+ /* The mutex protects alarm operations, and prevents a race
+ * between the enable_irq() in the workqueue and the free_irq()
+ * in the remove function.
+ */
+ struct mutex mutex;
+ bool suspended;
+ int exiting;
+};
+
+static struct i2c_driver ds3232_driver;
+
+static int ds3232_check_rtc_status(struct i2c_client *client)
+{
+ int ret = 0;
+ int control, stat;
+
+ stat = i2c_smbus_read_byte_data(client, DS3232_REG_SR);
+ if (stat < 0)
+ return stat;
+
+ if (stat & DS3232_REG_SR_OSF)
+ dev_warn(&client->dev,
+ "oscillator discontinuity flagged, "
+ "time unreliable\n");
+
+ stat &= ~(DS3232_REG_SR_OSF | DS3232_REG_SR_A1F | DS3232_REG_SR_A2F);
+
+ ret = i2c_smbus_write_byte_data(client, DS3232_REG_SR, stat);
+ if (ret < 0)
+ return ret;
+
+ /* If the alarm is pending, clear it before requesting
+ * the interrupt, so an interrupt event isn't reported
+ * before everything is initialized.
+ */
+
+ control = i2c_smbus_read_byte_data(client, DS3232_REG_CR);
+ if (control < 0)
+ return control;
+
+ control &= ~(DS3232_REG_CR_A1IE | DS3232_REG_CR_A2IE);
+ control |= DS3232_REG_CR_INTCN;
+
+ return i2c_smbus_write_byte_data(client, DS3232_REG_CR, control);
+}
+
+static int ds3232_read_time(struct device *dev, struct rtc_time *time)
+{
+ struct i2c_client *client = to_i2c_client(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 = i2c_smbus_read_i2c_block_data(client, DS3232_REG_SECONDS, 7, buf);
+
+ if (ret < 0)
+ return ret;
+ if (ret < 7)
+ return -EIO;
+
+ 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 rtc_valid_tm(time);
+}
+
+static int ds3232_set_time(struct device *dev, struct rtc_time *time)
+{
+ struct i2c_client *client = to_i2c_client(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 i2c_smbus_write_i2c_block_data(client,
+ DS3232_REG_SECONDS, 7, buf);
+}
+
+/*
+ * 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 i2c_client *client = to_i2c_client(dev);
+ struct ds3232 *ds3232 = i2c_get_clientdata(client);
+ int control, stat;
+ int ret;
+ u8 buf[4];
+
+ mutex_lock(&ds3232->mutex);
+
+ ret = i2c_smbus_read_byte_data(client, DS3232_REG_SR);
+ if (ret < 0)
+ goto out;
+ stat = ret;
+ ret = i2c_smbus_read_byte_data(client, DS3232_REG_CR);
+ if (ret < 0)
+ goto out;
+ control = ret;
+ ret = i2c_smbus_read_i2c_block_data(client, DS3232_REG_ALARM1, 4, buf);
+ if (ret < 0)
+ 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->time.tm_mon = -1;
+ alarm->time.tm_year = -1;
+ alarm->time.tm_wday = -1;
+ alarm->time.tm_yday = -1;
+ alarm->time.tm_isdst = -1;
+
+ alarm->enabled = !!(control & DS3232_REG_CR_A1IE);
+ alarm->pending = !!(stat & DS3232_REG_SR_A1F);
+
+ ret = 0;
+out:
+ mutex_unlock(&ds3232->mutex);
+ 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 i2c_client *client = to_i2c_client(dev);
+ struct ds3232 *ds3232 = i2c_get_clientdata(client);
+ int control, stat;
+ int ret;
+ u8 buf[4];
+
+ if (client->irq <= 0)
+ return -EINVAL;
+
+ mutex_lock(&ds3232->mutex);
+
+ 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 = i2c_smbus_read_byte_data(client, DS3232_REG_CR);
+ if (ret < 0)
+ goto out;
+ control = ret;
+ control &= ~(DS3232_REG_CR_A1IE | DS3232_REG_CR_A2IE);
+ ret = i2c_smbus_write_byte_data(client, DS3232_REG_CR, control);
+ if (ret < 0)
+ goto out;
+
+ /* clear any pending alarm flag */
+ ret = i2c_smbus_read_byte_data(client, DS3232_REG_SR);
+ if (ret < 0)
+ goto out;
+ stat = ret;
+ stat &= ~(DS3232_REG_SR_A1F | DS3232_REG_SR_A2F);
+ ret = i2c_smbus_write_byte_data(client, DS3232_REG_SR, stat);
+ if (ret < 0)
+ goto out;
+
+ ret = i2c_smbus_write_i2c_block_data(client, DS3232_REG_ALARM1, 4, buf);
+
+ if (alarm->enabled) {
+ control |= DS3232_REG_CR_A1IE;
+ ret = i2c_smbus_write_byte_data(client, DS3232_REG_CR, control);
+ }
+out:
+ mutex_unlock(&ds3232->mutex);
+ return ret;
+}
+
+static void ds3232_update_alarm(struct i2c_client *client)
+{
+ struct ds3232 *ds3232 = i2c_get_clientdata(client);
+ int control;
+ int ret;
+ u8 buf[4];
+
+ mutex_lock(&ds3232->mutex);
+
+ ret = i2c_smbus_read_i2c_block_data(client, DS3232_REG_ALARM1, 4, buf);
+ if (ret < 0)
+ goto unlock;
+
+ buf[0] = bcd2bin(buf[0]) < 0 || (ds3232->rtc->irq_data & RTC_UF) ?
+ 0x80 : buf[0];
+ buf[1] = bcd2bin(buf[1]) < 0 || (ds3232->rtc->irq_data & RTC_UF) ?
+ 0x80 : buf[1];
+ buf[2] = bcd2bin(buf[2]) < 0 || (ds3232->rtc->irq_data & RTC_UF) ?
+ 0x80 : buf[2];
+ buf[3] = bcd2bin(buf[3]) < 0 || (ds3232->rtc->irq_data & RTC_UF) ?
+ 0x80 : buf[3];
+
+ ret = i2c_smbus_write_i2c_block_data(client, DS3232_REG_ALARM1, 4, buf);
+ if (ret < 0)
+ goto unlock;
+
+ control = i2c_smbus_read_byte_data(client, DS3232_REG_CR);
+ if (control < 0)
+ goto unlock;
+
+ if (ds3232->rtc->irq_data & (RTC_AF | RTC_UF))
+ /* enable alarm1 interrupt */
+ control |= DS3232_REG_CR_A1IE;
+ else
+ /* disable alarm1 interrupt */
+ control &= ~(DS3232_REG_CR_A1IE);
+ i2c_smbus_write_byte_data(client, DS3232_REG_CR, control);
+
+unlock:
+ mutex_unlock(&ds3232->mutex);
+}
+
+static int ds3232_alarm_irq_enable(struct device *dev, unsigned int enabled)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct ds3232 *ds3232 = i2c_get_clientdata(client);
+
+ if (client->irq <= 0)
+ return -EINVAL;
+
+ if (enabled)
+ ds3232->rtc->irq_data |= RTC_AF;
+ else
+ ds3232->rtc->irq_data &= ~RTC_AF;
+
+ ds3232_update_alarm(client);
+ return 0;
+}
+
+static irqreturn_t ds3232_irq(int irq, void *dev_id)
+{
+ struct i2c_client *client = dev_id;
+ struct ds3232 *ds3232 = i2c_get_clientdata(client);
+
+ disable_irq_nosync(irq);
+
+ /*
+ * If rtc as a wakeup source, can't schedule the work
+ * at system resume flow, because at this time the i2c bus
+ * has not been resumed.
+ */
+ if (!ds3232->suspended)
+ schedule_work(&ds3232->work);
+
+ return IRQ_HANDLED;
+}
+
+static void ds3232_work(struct work_struct *work)
+{
+ struct ds3232 *ds3232 = container_of(work, struct ds3232, work);
+ struct i2c_client *client = ds3232->client;
+ int stat, control;
+
+ mutex_lock(&ds3232->mutex);
+
+ stat = i2c_smbus_read_byte_data(client, DS3232_REG_SR);
+ if (stat < 0)
+ goto unlock;
+
+ if (stat & DS3232_REG_SR_A1F) {
+ control = i2c_smbus_read_byte_data(client, DS3232_REG_CR);
+ if (control < 0) {
+ pr_warn("Read Control Register error - Disable IRQ%d\n",
+ client->irq);
+ } else {
+ /* disable alarm1 interrupt */
+ control &= ~(DS3232_REG_CR_A1IE);
+ i2c_smbus_write_byte_data(client, DS3232_REG_CR,
+ control);
+
+ /* clear the alarm pend flag */
+ stat &= ~DS3232_REG_SR_A1F;
+ i2c_smbus_write_byte_data(client, DS3232_REG_SR, stat);
+
+ rtc_update_irq(ds3232->rtc, 1, RTC_AF | RTC_IRQF);
+
+ if (!ds3232->exiting)
+ enable_irq(client->irq);
+ }
+ }
+
+unlock:
+ mutex_unlock(&ds3232->mutex);
+}
+
+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 i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct ds3232 *ds3232;
+ int ret;
+
+ ds3232 = devm_kzalloc(&client->dev, sizeof(struct ds3232), GFP_KERNEL);
+ if (!ds3232)
+ return -ENOMEM;
+
+ ds3232->client = client;
+ i2c_set_clientdata(client, ds3232);
+
+ INIT_WORK(&ds3232->work, ds3232_work);
+ mutex_init(&ds3232->mutex);
+
+ ret = ds3232_check_rtc_status(client);
+ if (ret)
+ return ret;
+
+ if (client->irq > 0) {
+ ret = devm_request_irq(&client->dev, client->irq, ds3232_irq,
+ IRQF_SHARED, "ds3232", client);
+ if (ret) {
+ dev_err(&client->dev, "unable to request IRQ\n");
+ }
+ device_init_wakeup(&client->dev, 1);
+ }
+ ds3232->rtc = devm_rtc_device_register(&client->dev, client->name,
+ &ds3232_rtc_ops, THIS_MODULE);
+ return PTR_ERR_OR_ZERO(ds3232->rtc);
+}
+
+static int ds3232_remove(struct i2c_client *client)
+{
+ struct ds3232 *ds3232 = i2c_get_clientdata(client);
+
+ if (client->irq > 0) {
+ mutex_lock(&ds3232->mutex);
+ ds3232->exiting = 1;
+ mutex_unlock(&ds3232->mutex);
+
+ devm_free_irq(&client->dev, client->irq, client);
+ cancel_work_sync(&ds3232->work);
+ }
+
+ return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int ds3232_suspend(struct device *dev)
+{
+ struct ds3232 *ds3232 = dev_get_drvdata(dev);
+ struct i2c_client *client = to_i2c_client(dev);
+
+ if (device_can_wakeup(dev)) {
+ ds3232->suspended = true;
+ if (irq_set_irq_wake(client->irq, 1)) {
+ dev_warn_once(dev, "Cannot set wakeup source\n");
+ ds3232->suspended = false;
+ }
+ }
+
+ return 0;
+}
+
+static int ds3232_resume(struct device *dev)
+{
+ struct ds3232 *ds3232 = dev_get_drvdata(dev);
+ struct i2c_client *client = to_i2c_client(dev);
+
+ if (ds3232->suspended) {
+ ds3232->suspended = false;
+
+ /* Clear the hardware alarm pend flag */
+ schedule_work(&ds3232->work);
+
+ irq_set_irq_wake(client->irq, 0);
+ }
+
+ return 0;
+}
+#endif
+
+static const struct dev_pm_ops ds3232_pm_ops = {
+ SET_SYSTEM_SLEEP_PM_OPS(ds3232_suspend, ds3232_resume)
+};
+
+static const struct i2c_device_id ds3232_id[] = {
+ { "ds3232", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, ds3232_id);
+
+static struct i2c_driver ds3232_driver = {
+ .driver = {
+ .name = "rtc-ds3232",
+ .pm = &ds3232_pm_ops,
+ },
+ .probe = ds3232_probe,
+ .remove = ds3232_remove,
+ .id_table = ds3232_id,
+};
+
+module_i2c_driver(ds3232_driver);
+
+MODULE_AUTHOR("Srikanth Srinivasan <srikanth.srinivasan@freescale.com>");
+MODULE_DESCRIPTION("Maxim/Dallas DS3232 RTC Driver");
+MODULE_LICENSE("GPL");
deleted file mode 100644
@@ -1,517 +0,0 @@
-/*
- * RTC client/driver for the Maxim/Dallas DS3232 Real-Time Clock over I2C
- *
- * Copyright (C) 2009-2011 Freescale Semiconductor.
- * Author: Jack Lan <jack.lan@freescale.com>
- *
- * 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.
- */
-/*
- * It would be more efficient to use i2c msgs/i2c_transfer directly but, as
- * recommened in .../Documentation/i2c/writing-clients section
- * "Sending and receiving", using SMBus level communication is preferred.
- */
-
-#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/rtc.h>
-#include <linux/bcd.h>
-#include <linux/workqueue.h>
-#include <linux/slab.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
-
-struct ds3232 {
- struct i2c_client *client;
- struct rtc_device *rtc;
- struct work_struct work;
-
- /* The mutex protects alarm operations, and prevents a race
- * between the enable_irq() in the workqueue and the free_irq()
- * in the remove function.
- */
- struct mutex mutex;
- bool suspended;
- int exiting;
-};
-
-static struct i2c_driver ds3232_driver;
-
-static int ds3232_check_rtc_status(struct i2c_client *client)
-{
- int ret = 0;
- int control, stat;
-
- stat = i2c_smbus_read_byte_data(client, DS3232_REG_SR);
- if (stat < 0)
- return stat;
-
- if (stat & DS3232_REG_SR_OSF)
- dev_warn(&client->dev,
- "oscillator discontinuity flagged, "
- "time unreliable\n");
-
- stat &= ~(DS3232_REG_SR_OSF | DS3232_REG_SR_A1F | DS3232_REG_SR_A2F);
-
- ret = i2c_smbus_write_byte_data(client, DS3232_REG_SR, stat);
- if (ret < 0)
- return ret;
-
- /* If the alarm is pending, clear it before requesting
- * the interrupt, so an interrupt event isn't reported
- * before everything is initialized.
- */
-
- control = i2c_smbus_read_byte_data(client, DS3232_REG_CR);
- if (control < 0)
- return control;
-
- control &= ~(DS3232_REG_CR_A1IE | DS3232_REG_CR_A2IE);
- control |= DS3232_REG_CR_INTCN;
-
- return i2c_smbus_write_byte_data(client, DS3232_REG_CR, control);
-}
-
-static int ds3232_read_time(struct device *dev, struct rtc_time *time)
-{
- struct i2c_client *client = to_i2c_client(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 = i2c_smbus_read_i2c_block_data(client, DS3232_REG_SECONDS, 7, buf);
-
- if (ret < 0)
- return ret;
- if (ret < 7)
- return -EIO;
-
- 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 rtc_valid_tm(time);
-}
-
-static int ds3232_set_time(struct device *dev, struct rtc_time *time)
-{
- struct i2c_client *client = to_i2c_client(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 i2c_smbus_write_i2c_block_data(client,
- DS3232_REG_SECONDS, 7, buf);
-}
-
-/*
- * 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 i2c_client *client = to_i2c_client(dev);
- struct ds3232 *ds3232 = i2c_get_clientdata(client);
- int control, stat;
- int ret;
- u8 buf[4];
-
- mutex_lock(&ds3232->mutex);
-
- ret = i2c_smbus_read_byte_data(client, DS3232_REG_SR);
- if (ret < 0)
- goto out;
- stat = ret;
- ret = i2c_smbus_read_byte_data(client, DS3232_REG_CR);
- if (ret < 0)
- goto out;
- control = ret;
- ret = i2c_smbus_read_i2c_block_data(client, DS3232_REG_ALARM1, 4, buf);
- if (ret < 0)
- 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->time.tm_mon = -1;
- alarm->time.tm_year = -1;
- alarm->time.tm_wday = -1;
- alarm->time.tm_yday = -1;
- alarm->time.tm_isdst = -1;
-
- alarm->enabled = !!(control & DS3232_REG_CR_A1IE);
- alarm->pending = !!(stat & DS3232_REG_SR_A1F);
-
- ret = 0;
-out:
- mutex_unlock(&ds3232->mutex);
- 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 i2c_client *client = to_i2c_client(dev);
- struct ds3232 *ds3232 = i2c_get_clientdata(client);
- int control, stat;
- int ret;
- u8 buf[4];
-
- if (client->irq <= 0)
- return -EINVAL;
-
- mutex_lock(&ds3232->mutex);
-
- 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 = i2c_smbus_read_byte_data(client, DS3232_REG_CR);
- if (ret < 0)
- goto out;
- control = ret;
- control &= ~(DS3232_REG_CR_A1IE | DS3232_REG_CR_A2IE);
- ret = i2c_smbus_write_byte_data(client, DS3232_REG_CR, control);
- if (ret < 0)
- goto out;
-
- /* clear any pending alarm flag */
- ret = i2c_smbus_read_byte_data(client, DS3232_REG_SR);
- if (ret < 0)
- goto out;
- stat = ret;
- stat &= ~(DS3232_REG_SR_A1F | DS3232_REG_SR_A2F);
- ret = i2c_smbus_write_byte_data(client, DS3232_REG_SR, stat);
- if (ret < 0)
- goto out;
-
- ret = i2c_smbus_write_i2c_block_data(client, DS3232_REG_ALARM1, 4, buf);
-
- if (alarm->enabled) {
- control |= DS3232_REG_CR_A1IE;
- ret = i2c_smbus_write_byte_data(client, DS3232_REG_CR, control);
- }
-out:
- mutex_unlock(&ds3232->mutex);
- return ret;
-}
-
-static void ds3232_update_alarm(struct i2c_client *client)
-{
- struct ds3232 *ds3232 = i2c_get_clientdata(client);
- int control;
- int ret;
- u8 buf[4];
-
- mutex_lock(&ds3232->mutex);
-
- ret = i2c_smbus_read_i2c_block_data(client, DS3232_REG_ALARM1, 4, buf);
- if (ret < 0)
- goto unlock;
-
- buf[0] = bcd2bin(buf[0]) < 0 || (ds3232->rtc->irq_data & RTC_UF) ?
- 0x80 : buf[0];
- buf[1] = bcd2bin(buf[1]) < 0 || (ds3232->rtc->irq_data & RTC_UF) ?
- 0x80 : buf[1];
- buf[2] = bcd2bin(buf[2]) < 0 || (ds3232->rtc->irq_data & RTC_UF) ?
- 0x80 : buf[2];
- buf[3] = bcd2bin(buf[3]) < 0 || (ds3232->rtc->irq_data & RTC_UF) ?
- 0x80 : buf[3];
-
- ret = i2c_smbus_write_i2c_block_data(client, DS3232_REG_ALARM1, 4, buf);
- if (ret < 0)
- goto unlock;
-
- control = i2c_smbus_read_byte_data(client, DS3232_REG_CR);
- if (control < 0)
- goto unlock;
-
- if (ds3232->rtc->irq_data & (RTC_AF | RTC_UF))
- /* enable alarm1 interrupt */
- control |= DS3232_REG_CR_A1IE;
- else
- /* disable alarm1 interrupt */
- control &= ~(DS3232_REG_CR_A1IE);
- i2c_smbus_write_byte_data(client, DS3232_REG_CR, control);
-
-unlock:
- mutex_unlock(&ds3232->mutex);
-}
-
-static int ds3232_alarm_irq_enable(struct device *dev, unsigned int enabled)
-{
- struct i2c_client *client = to_i2c_client(dev);
- struct ds3232 *ds3232 = i2c_get_clientdata(client);
-
- if (client->irq <= 0)
- return -EINVAL;
-
- if (enabled)
- ds3232->rtc->irq_data |= RTC_AF;
- else
- ds3232->rtc->irq_data &= ~RTC_AF;
-
- ds3232_update_alarm(client);
- return 0;
-}
-
-static irqreturn_t ds3232_irq(int irq, void *dev_id)
-{
- struct i2c_client *client = dev_id;
- struct ds3232 *ds3232 = i2c_get_clientdata(client);
-
- disable_irq_nosync(irq);
-
- /*
- * If rtc as a wakeup source, can't schedule the work
- * at system resume flow, because at this time the i2c bus
- * has not been resumed.
- */
- if (!ds3232->suspended)
- schedule_work(&ds3232->work);
-
- return IRQ_HANDLED;
-}
-
-static void ds3232_work(struct work_struct *work)
-{
- struct ds3232 *ds3232 = container_of(work, struct ds3232, work);
- struct i2c_client *client = ds3232->client;
- int stat, control;
-
- mutex_lock(&ds3232->mutex);
-
- stat = i2c_smbus_read_byte_data(client, DS3232_REG_SR);
- if (stat < 0)
- goto unlock;
-
- if (stat & DS3232_REG_SR_A1F) {
- control = i2c_smbus_read_byte_data(client, DS3232_REG_CR);
- if (control < 0) {
- pr_warn("Read Control Register error - Disable IRQ%d\n",
- client->irq);
- } else {
- /* disable alarm1 interrupt */
- control &= ~(DS3232_REG_CR_A1IE);
- i2c_smbus_write_byte_data(client, DS3232_REG_CR,
- control);
-
- /* clear the alarm pend flag */
- stat &= ~DS3232_REG_SR_A1F;
- i2c_smbus_write_byte_data(client, DS3232_REG_SR, stat);
-
- rtc_update_irq(ds3232->rtc, 1, RTC_AF | RTC_IRQF);
-
- if (!ds3232->exiting)
- enable_irq(client->irq);
- }
- }
-
-unlock:
- mutex_unlock(&ds3232->mutex);
-}
-
-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 i2c_client *client,
- const struct i2c_device_id *id)
-{
- struct ds3232 *ds3232;
- int ret;
-
- ds3232 = devm_kzalloc(&client->dev, sizeof(struct ds3232), GFP_KERNEL);
- if (!ds3232)
- return -ENOMEM;
-
- ds3232->client = client;
- i2c_set_clientdata(client, ds3232);
-
- INIT_WORK(&ds3232->work, ds3232_work);
- mutex_init(&ds3232->mutex);
-
- ret = ds3232_check_rtc_status(client);
- if (ret)
- return ret;
-
- if (client->irq > 0) {
- ret = devm_request_irq(&client->dev, client->irq, ds3232_irq,
- IRQF_SHARED, "ds3232", client);
- if (ret) {
- dev_err(&client->dev, "unable to request IRQ\n");
- }
- device_init_wakeup(&client->dev, 1);
- }
- ds3232->rtc = devm_rtc_device_register(&client->dev, client->name,
- &ds3232_rtc_ops, THIS_MODULE);
- return PTR_ERR_OR_ZERO(ds3232->rtc);
-}
-
-static int ds3232_remove(struct i2c_client *client)
-{
- struct ds3232 *ds3232 = i2c_get_clientdata(client);
-
- if (client->irq > 0) {
- mutex_lock(&ds3232->mutex);
- ds3232->exiting = 1;
- mutex_unlock(&ds3232->mutex);
-
- devm_free_irq(&client->dev, client->irq, client);
- cancel_work_sync(&ds3232->work);
- }
-
- return 0;
-}
-
-#ifdef CONFIG_PM_SLEEP
-static int ds3232_suspend(struct device *dev)
-{
- struct ds3232 *ds3232 = dev_get_drvdata(dev);
- struct i2c_client *client = to_i2c_client(dev);
-
- if (device_can_wakeup(dev)) {
- ds3232->suspended = true;
- if (irq_set_irq_wake(client->irq, 1)) {
- dev_warn_once(dev, "Cannot set wakeup source\n");
- ds3232->suspended = false;
- }
- }
-
- return 0;
-}
-
-static int ds3232_resume(struct device *dev)
-{
- struct ds3232 *ds3232 = dev_get_drvdata(dev);
- struct i2c_client *client = to_i2c_client(dev);
-
- if (ds3232->suspended) {
- ds3232->suspended = false;
-
- /* Clear the hardware alarm pend flag */
- schedule_work(&ds3232->work);
-
- irq_set_irq_wake(client->irq, 0);
- }
-
- return 0;
-}
-#endif
-
-static const struct dev_pm_ops ds3232_pm_ops = {
- SET_SYSTEM_SLEEP_PM_OPS(ds3232_suspend, ds3232_resume)
-};
-
-static const struct i2c_device_id ds3232_id[] = {
- { "ds3232", 0 },
- { }
-};
-MODULE_DEVICE_TABLE(i2c, ds3232_id);
-
-static struct i2c_driver ds3232_driver = {
- .driver = {
- .name = "rtc-ds3232",
- .pm = &ds3232_pm_ops,
- },
- .probe = ds3232_probe,
- .remove = ds3232_remove,
- .id_table = ds3232_id,
-};
-
-module_i2c_driver(ds3232_driver);
-
-MODULE_AUTHOR("Srikanth Srinivasan <srikanth.srinivasan@freescale.com>");
-MODULE_DESCRIPTION("Maxim/Dallas DS3232 RTC Driver");
-MODULE_LICENSE("GPL");
This is preparation for splitting into core module and i2c driver. This will make it a lot easier to review the real changes. Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com> Cc: Alessandro Zummo <a.zummo@towertech.it> Cc: Alexandre Belloni <alexandre.belloni@free-electrons.com> Cc: Jack Lan <jack.lan@freescale.com> Cc: Srikanth Srinivasan <srikanth.srinivasan@freescale.com> Cc: Dennis Aberilla <denzzzhome@yahoo.com> --- drivers/rtc/Makefile | 1 + drivers/rtc/rtc-ds3232-core.c | 517 ++++++++++++++++++++++++++++++++++++++++++ drivers/rtc/rtc-ds3232.c | 517 ------------------------------------------ 3 files changed, 518 insertions(+), 517 deletions(-) create mode 100644 drivers/rtc/rtc-ds3232-core.c delete mode 100644 drivers/rtc/rtc-ds3232.c