rtc: ds3232: convert to use regmap
This is preparation for merging rtc-ds3232 i2c driver and rtc-ds3234 spi driver. 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: Dennis Aberilla <denzzzhome@yahoo.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
This commit is contained in:
Akinobu Mita
Alexandre Belloni
parent
832315b05b
commit
370927c4b6
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@ -9,11 +9,6 @@
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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/*
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* It would be more efficient to use i2c msgs/i2c_transfer directly but, as
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* recommened in .../Documentation/i2c/writing-clients section
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* "Sending and receiving", using SMBus level communication is preferred.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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@ -25,6 +20,7 @@
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#include <linux/bcd.h>
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#include <linux/workqueue.h>
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#include <linux/slab.h>
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#include <linux/regmap.h>
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#define DS3232_REG_SECONDS 0x00
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#define DS3232_REG_MINUTES 0x01
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@ -50,7 +46,9 @@
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# define DS3232_REG_SR_A1F 0x01
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struct ds3232 {
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struct i2c_client *client;
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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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struct work_struct work;
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@ -63,26 +61,25 @@ struct ds3232 {
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int exiting;
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};
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static struct i2c_driver ds3232_driver;
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static int ds3232_check_rtc_status(struct i2c_client *client)
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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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stat = i2c_smbus_read_byte_data(client, DS3232_REG_SR);
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if (stat < 0)
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return stat;
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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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if (stat & DS3232_REG_SR_OSF)
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dev_warn(&client->dev,
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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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ret = i2c_smbus_write_byte_data(client, DS3232_REG_SR, stat);
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if (ret < 0)
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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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/* If the alarm is pending, clear it before requesting
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@ -90,31 +87,28 @@ static int ds3232_check_rtc_status(struct i2c_client *client)
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* before everything is initialized.
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*/
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control = i2c_smbus_read_byte_data(client, DS3232_REG_CR);
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if (control < 0)
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return control;
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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 i2c_smbus_write_byte_data(client, DS3232_REG_CR, control);
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return regmap_write(ds3232->regmap, DS3232_REG_CR, control);
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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 i2c_client *client = to_i2c_client(dev);
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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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ret = i2c_smbus_read_i2c_block_data(client, DS3232_REG_SECONDS, 7, buf);
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if (ret < 0)
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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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if (ret < 7)
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return -EIO;
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second = buf[0];
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minute = buf[1];
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@ -159,7 +153,7 @@ static int ds3232_read_time(struct device *dev, struct rtc_time *time)
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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 i2c_client *client = to_i2c_client(dev);
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struct ds3232 *ds3232 = dev_get_drvdata(dev);
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u8 buf[7];
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/* Extract time from rtc_time and load into ds3232*/
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@ -179,8 +173,7 @@ static int ds3232_set_time(struct device *dev, struct rtc_time *time)
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buf[6] = bin2bcd(time->tm_year);
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}
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return i2c_smbus_write_i2c_block_data(client,
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DS3232_REG_SECONDS, 7, buf);
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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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@ -190,24 +183,21 @@ static int ds3232_set_time(struct device *dev, struct rtc_time *time)
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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 i2c_client *client = to_i2c_client(dev);
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struct ds3232 *ds3232 = i2c_get_clientdata(client);
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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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mutex_lock(&ds3232->mutex);
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ret = i2c_smbus_read_byte_data(client, DS3232_REG_SR);
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if (ret < 0)
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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 = ret;
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ret = i2c_smbus_read_byte_data(client, DS3232_REG_CR);
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if (ret < 0)
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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 = ret;
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ret = i2c_smbus_read_i2c_block_data(client, DS3232_REG_ALARM1, 4, buf);
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if (ret < 0)
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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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@ -236,13 +226,12 @@ out:
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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 i2c_client *client = to_i2c_client(dev);
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struct ds3232 *ds3232 = i2c_get_clientdata(client);
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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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if (client->irq <= 0)
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if (ds3232->irq <= 0)
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return -EINVAL;
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mutex_lock(&ds3232->mutex);
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@ -253,47 +242,45 @@ static int ds3232_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
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buf[3] = bin2bcd(alarm->time.tm_mday);
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/* clear alarm interrupt enable bit */
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ret = i2c_smbus_read_byte_data(client, DS3232_REG_CR);
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if (ret < 0)
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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 = ret;
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control &= ~(DS3232_REG_CR_A1IE | DS3232_REG_CR_A2IE);
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ret = i2c_smbus_write_byte_data(client, DS3232_REG_CR, control);
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if (ret < 0)
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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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/* clear any pending alarm flag */
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ret = i2c_smbus_read_byte_data(client, DS3232_REG_SR);
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if (ret < 0)
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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 = ret;
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stat &= ~(DS3232_REG_SR_A1F | DS3232_REG_SR_A2F);
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ret = i2c_smbus_write_byte_data(client, DS3232_REG_SR, stat);
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if (ret < 0)
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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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ret = i2c_smbus_write_i2c_block_data(client, DS3232_REG_ALARM1, 4, buf);
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ret = regmap_bulk_write(ds3232->regmap, DS3232_REG_ALARM1, buf, 4);
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if (alarm->enabled) {
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control |= DS3232_REG_CR_A1IE;
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ret = i2c_smbus_write_byte_data(client, DS3232_REG_CR, control);
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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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mutex_unlock(&ds3232->mutex);
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return ret;
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}
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static void ds3232_update_alarm(struct i2c_client *client)
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static void ds3232_update_alarm(struct device *dev)
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{
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struct ds3232 *ds3232 = i2c_get_clientdata(client);
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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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u8 buf[4];
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mutex_lock(&ds3232->mutex);
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ret = i2c_smbus_read_i2c_block_data(client, DS3232_REG_ALARM1, 4, buf);
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if (ret < 0)
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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 unlock;
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buf[0] = bcd2bin(buf[0]) < 0 || (ds3232->rtc->irq_data & RTC_UF) ?
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@ -305,12 +292,12 @@ static void ds3232_update_alarm(struct i2c_client *client)
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buf[3] = bcd2bin(buf[3]) < 0 || (ds3232->rtc->irq_data & RTC_UF) ?
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0x80 : buf[3];
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ret = i2c_smbus_write_i2c_block_data(client, DS3232_REG_ALARM1, 4, buf);
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if (ret < 0)
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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 unlock;
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control = i2c_smbus_read_byte_data(client, DS3232_REG_CR);
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if (control < 0)
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ret = regmap_read(ds3232->regmap, DS3232_REG_CR, &control);
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if (ret)
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goto unlock;
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if (ds3232->rtc->irq_data & (RTC_AF | RTC_UF))
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@ -319,7 +306,7 @@ static void ds3232_update_alarm(struct i2c_client *client)
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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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i2c_smbus_write_byte_data(client, DS3232_REG_CR, control);
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regmap_write(ds3232->regmap, DS3232_REG_CR, control);
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unlock:
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mutex_unlock(&ds3232->mutex);
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@ -327,10 +314,9 @@ unlock:
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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 i2c_client *client = to_i2c_client(dev);
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struct ds3232 *ds3232 = i2c_get_clientdata(client);
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struct ds3232 *ds3232 = dev_get_drvdata(dev);
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if (client->irq <= 0)
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if (ds3232->irq <= 0)
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return -EINVAL;
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if (enabled)
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@ -338,14 +324,14 @@ static int ds3232_alarm_irq_enable(struct device *dev, unsigned int enabled)
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else
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ds3232->rtc->irq_data &= ~RTC_AF;
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ds3232_update_alarm(client);
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ds3232_update_alarm(dev);
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return 0;
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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 i2c_client *client = dev_id;
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struct ds3232 *ds3232 = i2c_get_clientdata(client);
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struct device *dev = dev_id;
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struct ds3232 *ds3232 = dev_get_drvdata(dev);
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disable_irq_nosync(irq);
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@ -363,34 +349,33 @@ static irqreturn_t ds3232_irq(int irq, void *dev_id)
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static void ds3232_work(struct work_struct *work)
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{
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struct ds3232 *ds3232 = container_of(work, struct ds3232, work);
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struct i2c_client *client = ds3232->client;
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int ret;
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int stat, control;
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mutex_lock(&ds3232->mutex);
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stat = i2c_smbus_read_byte_data(client, DS3232_REG_SR);
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if (stat < 0)
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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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control = i2c_smbus_read_byte_data(client, DS3232_REG_CR);
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if (control < 0) {
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ret = regmap_read(ds3232->regmap, DS3232_REG_CR, &control);
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if (ret) {
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pr_warn("Read Control Register error - Disable IRQ%d\n",
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client->irq);
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ds3232->irq);
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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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i2c_smbus_write_byte_data(client, DS3232_REG_CR,
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control);
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regmap_write(ds3232->regmap, DS3232_REG_CR, control);
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/* clear the alarm pend flag */
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stat &= ~DS3232_REG_SR_A1F;
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i2c_smbus_write_byte_data(client, DS3232_REG_SR, stat);
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regmap_write(ds3232->regmap, DS3232_REG_SR, stat);
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rtc_update_irq(ds3232->rtc, 1, RTC_AF | RTC_IRQF);
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if (!ds3232->exiting)
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enable_irq(client->irq);
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enable_irq(ds3232->irq);
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}
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}
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@ -406,49 +391,53 @@ static const struct rtc_class_ops ds3232_rtc_ops = {
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.alarm_irq_enable = ds3232_alarm_irq_enable,
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};
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static int ds3232_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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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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ds3232 = devm_kzalloc(&client->dev, sizeof(struct ds3232), GFP_KERNEL);
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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->client = client;
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i2c_set_clientdata(client, ds3232);
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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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INIT_WORK(&ds3232->work, ds3232_work);
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mutex_init(&ds3232->mutex);
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ret = ds3232_check_rtc_status(client);
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ret = ds3232_check_rtc_status(dev);
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if (ret)
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return ret;
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if (client->irq > 0) {
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ret = devm_request_irq(&client->dev, client->irq, ds3232_irq,
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IRQF_SHARED, "ds3232", client);
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if (ds3232->irq > 0) {
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ret = devm_request_irq(dev, ds3232->irq, ds3232_irq,
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IRQF_SHARED, name, dev);
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if (ret) {
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dev_err(&client->dev, "unable to request IRQ\n");
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}
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device_init_wakeup(&client->dev, 1);
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ds3232->irq = 0;
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dev_err(dev, "unable to request IRQ\n");
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} else
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device_init_wakeup(dev, 1);
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}
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ds3232->rtc = devm_rtc_device_register(&client->dev, client->name,
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&ds3232_rtc_ops, THIS_MODULE);
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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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return PTR_ERR_OR_ZERO(ds3232->rtc);
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}
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static int ds3232_remove(struct i2c_client *client)
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static int ds3232_remove(struct device *dev)
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{
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struct ds3232 *ds3232 = i2c_get_clientdata(client);
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struct ds3232 *ds3232 = dev_get_drvdata(dev);
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if (client->irq > 0) {
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if (ds3232->irq > 0) {
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mutex_lock(&ds3232->mutex);
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ds3232->exiting = 1;
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mutex_unlock(&ds3232->mutex);
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devm_free_irq(&client->dev, client->irq, client);
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devm_free_irq(dev, ds3232->irq, dev);
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cancel_work_sync(&ds3232->work);
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}
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|
|
@ -459,11 +448,10 @@ static int ds3232_remove(struct i2c_client *client)
|
|||
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)) {
|
||||
if (irq_set_irq_wake(ds3232->irq, 1)) {
|
||||
dev_warn_once(dev, "Cannot set wakeup source\n");
|
||||
ds3232->suspended = false;
|
||||
}
|
||||
|
|
@ -475,7 +463,6 @@ static int ds3232_suspend(struct device *dev)
|
|||
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;
|
||||
|
|
@ -483,7 +470,7 @@ static int ds3232_resume(struct device *dev)
|
|||
/* Clear the hardware alarm pend flag */
|
||||
schedule_work(&ds3232->work);
|
||||
|
||||
irq_set_irq_wake(client->irq, 0);
|
||||
irq_set_irq_wake(ds3232->irq, 0);
|
||||
}
|
||||
|
||||
return 0;
|
||||
|
|
@ -494,6 +481,30 @@ static const struct dev_pm_ops ds3232_pm_ops = {
|
|||
SET_SYSTEM_SLEEP_PM_OPS(ds3232_suspend, ds3232_resume)
|
||||
};
|
||||
|
||||
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,
|
||||
};
|
||||
|
||||
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 int ds3232_i2c_remove(struct i2c_client *client)
|
||||
{
|
||||
return ds3232_remove(&client->dev);
|
||||
}
|
||||
|
||||
static const struct i2c_device_id ds3232_id[] = {
|
||||
{ "ds3232", 0 },
|
||||
{ }
|
||||
|
|
@ -505,11 +516,10 @@ static struct i2c_driver ds3232_driver = {
|
|||
.name = "rtc-ds3232",
|
||||
.pm = &ds3232_pm_ops,
|
||||
},
|
||||
.probe = ds3232_probe,
|
||||
.remove = ds3232_remove,
|
||||
.probe = ds3232_i2c_probe,
|
||||
.remove = ds3232_i2c_remove,
|
||||
.id_table = ds3232_id,
|
||||
};
|
||||
|
||||
module_i2c_driver(ds3232_driver);
|
||||
|
||||
MODULE_AUTHOR("Srikanth Srinivasan <srikanth.srinivasan@freescale.com>");
|
||||
|
|
|
|||
Loading…
Reference in New Issue