drivers/rtc: add support for maxim dallas rtc ds1343 and ds1344
Signed-off-by: Raghavendra Chandra Ganiga <ravi23ganiga@gmail.com> Cc: Alessandro Zummo <a.zummo@towertech.it> Cc: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Raghavendra Ganiga
Linus Torvalds
parent
7abe3f5404
commit
1d6316f56d
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@ -573,6 +573,16 @@ config RTC_DRV_DS1305
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This driver can also be built as a module. If so, the module
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will be called rtc-ds1305.
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config RTC_DRV_DS1343
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tristate "Dallas/Maxim DS1343/DS1344"
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help
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If you say yes here you get support for the
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Dallas/Maxim DS1343 and DS1344 real time clock chips.
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Support for trickle charger, alarm is provided.
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This driver can also be built as a module. If so, the module
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will be called rtc-ds1343.
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config RTC_DRV_DS1347
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tristate "Dallas/Maxim DS1347"
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help
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@ -40,6 +40,7 @@ obj-$(CONFIG_RTC_DRV_DS1286) += rtc-ds1286.o
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obj-$(CONFIG_RTC_DRV_DS1302) += rtc-ds1302.o
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obj-$(CONFIG_RTC_DRV_DS1305) += rtc-ds1305.o
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obj-$(CONFIG_RTC_DRV_DS1307) += rtc-ds1307.o
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obj-$(CONFIG_RTC_DRV_DS1343) += rtc-ds1343.o
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obj-$(CONFIG_RTC_DRV_DS1347) += rtc-ds1347.o
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obj-$(CONFIG_RTC_DRV_DS1374) += rtc-ds1374.o
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obj-$(CONFIG_RTC_DRV_DS1390) += rtc-ds1390.o
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@ -0,0 +1,679 @@
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/* rtc-ds1343.c
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*
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* Driver for Dallas Semiconductor DS1343 Low Current, SPI Compatible
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* Real Time Clock
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*
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* Author : Raghavendra Chandra Ganiga <ravi23ganiga@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/device.h>
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#include <linux/spi/spi.h>
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#include <linux/regmap.h>
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#include <linux/rtc.h>
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#include <linux/bcd.h>
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#include <linux/pm.h>
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#include <linux/slab.h>
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#define DS1343_DRV_VERSION "01.00"
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#define DALLAS_MAXIM_DS1343 0
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#define DALLAS_MAXIM_DS1344 1
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/* RTC DS1343 Registers */
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#define DS1343_SECONDS_REG 0x00
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#define DS1343_MINUTES_REG 0x01
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#define DS1343_HOURS_REG 0x02
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#define DS1343_DAY_REG 0x03
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#define DS1343_DATE_REG 0x04
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#define DS1343_MONTH_REG 0x05
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#define DS1343_YEAR_REG 0x06
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#define DS1343_ALM0_SEC_REG 0x07
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#define DS1343_ALM0_MIN_REG 0x08
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#define DS1343_ALM0_HOUR_REG 0x09
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#define DS1343_ALM0_DAY_REG 0x0A
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#define DS1343_ALM1_SEC_REG 0x0B
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#define DS1343_ALM1_MIN_REG 0x0C
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#define DS1343_ALM1_HOUR_REG 0x0D
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#define DS1343_ALM1_DAY_REG 0x0E
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#define DS1343_CONTROL_REG 0x0F
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#define DS1343_STATUS_REG 0x10
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#define DS1343_TRICKLE_REG 0x11
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/* DS1343 Control Registers bits */
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#define DS1343_EOSC 0x80
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#define DS1343_DOSF 0x20
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#define DS1343_EGFIL 0x10
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#define DS1343_SQW 0x08
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#define DS1343_INTCN 0x04
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#define DS1343_A1IE 0x02
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#define DS1343_A0IE 0x01
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/* DS1343 Status Registers bits */
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#define DS1343_OSF 0x80
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#define DS1343_IRQF1 0x02
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#define DS1343_IRQF0 0x01
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/* DS1343 Trickle Charger Registers bits */
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#define DS1343_TRICKLE_MAGIC 0xa0
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#define DS1343_TRICKLE_DS1 0x08
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#define DS1343_TRICKLE_1K 0x01
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#define DS1343_TRICKLE_2K 0x02
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#define DS1343_TRICKLE_4K 0x03
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static const struct spi_device_id ds1343_id[] = {
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{ "ds1343", DALLAS_MAXIM_DS1343 },
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{ "ds1344", DALLAS_MAXIM_DS1344 },
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{ }
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};
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MODULE_DEVICE_TABLE(spi, ds1343_id);
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struct ds1343_priv {
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struct spi_device *spi;
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struct rtc_device *rtc;
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struct regmap *map;
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struct mutex mutex;
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unsigned int irqen;
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int alarm_sec;
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int alarm_min;
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int alarm_hour;
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int alarm_mday;
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};
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static int ds1343_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
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{
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switch (cmd) {
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#ifdef RTC_SET_CHARGE
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case RTC_SET_CHARGE:
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{
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int val;
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if (copy_from_user(&val, (int __user *)arg, sizeof(int)))
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return -EFAULT;
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return regmap_write(priv->map, DS1343_TRICKLE_REG, val);
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}
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break;
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#endif
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}
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return -ENOIOCTLCMD;
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}
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static ssize_t ds1343_show_glitchfilter(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct ds1343_priv *priv = dev_get_drvdata(dev);
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int glitch_filt_status, data;
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regmap_read(priv->map, DS1343_CONTROL_REG, &data);
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glitch_filt_status = !!(data & DS1343_EGFIL);
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if (glitch_filt_status)
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return sprintf(buf, "enabled\n");
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else
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return sprintf(buf, "disabled\n");
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}
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static ssize_t ds1343_store_glitchfilter(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct ds1343_priv *priv = dev_get_drvdata(dev);
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int data;
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regmap_read(priv->map, DS1343_CONTROL_REG, &data);
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if (strncmp(buf, "enabled", 7) == 0)
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data |= DS1343_EGFIL;
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else if (strncmp(buf, "disabled", 8) == 0)
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data &= ~(DS1343_EGFIL);
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else
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return -EINVAL;
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regmap_write(priv->map, DS1343_CONTROL_REG, data);
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return count;
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}
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static DEVICE_ATTR(glitch_filter, S_IRUGO | S_IWUSR, ds1343_show_glitchfilter,
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ds1343_store_glitchfilter);
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static ssize_t ds1343_show_alarmstatus(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct ds1343_priv *priv = dev_get_drvdata(dev);
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int alarmstatus, data;
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regmap_read(priv->map, DS1343_CONTROL_REG, &data);
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alarmstatus = !!(data & DS1343_A0IE);
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if (alarmstatus)
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return sprintf(buf, "enabled\n");
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else
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return sprintf(buf, "disabled\n");
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}
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static DEVICE_ATTR(alarm_status, S_IRUGO, ds1343_show_alarmstatus, NULL);
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static ssize_t ds1343_show_alarmmode(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct ds1343_priv *priv = dev_get_drvdata(dev);
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int alarm_mode, data;
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char *alarm_str;
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regmap_read(priv->map, DS1343_ALM0_SEC_REG, &data);
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alarm_mode = (data & 0x80) >> 4;
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regmap_read(priv->map, DS1343_ALM0_MIN_REG, &data);
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alarm_mode |= (data & 0x80) >> 5;
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regmap_read(priv->map, DS1343_ALM0_HOUR_REG, &data);
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alarm_mode |= (data & 0x80) >> 6;
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regmap_read(priv->map, DS1343_ALM0_DAY_REG, &data);
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alarm_mode |= (data & 0x80) >> 7;
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switch (alarm_mode) {
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case 15:
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alarm_str = "each second";
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break;
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case 7:
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alarm_str = "seconds match";
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break;
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case 3:
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alarm_str = "minutes and seconds match";
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break;
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case 1:
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alarm_str = "hours, minutes and seconds match";
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break;
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case 0:
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alarm_str = "day, hours, minutes and seconds match";
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break;
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default:
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alarm_str = "invalid";
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break;
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}
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return sprintf(buf, "%s\n", alarm_str);
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}
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static DEVICE_ATTR(alarm_mode, S_IRUGO, ds1343_show_alarmmode, NULL);
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static ssize_t ds1343_show_tricklecharger(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct ds1343_priv *priv = dev_get_drvdata(dev);
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int data;
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char *diodes = "disabled", *resistors = " ";
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regmap_read(priv->map, DS1343_TRICKLE_REG, &data);
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if ((data & 0xf0) == DS1343_TRICKLE_MAGIC) {
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switch (data & 0x0c) {
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case DS1343_TRICKLE_DS1:
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diodes = "one diode,";
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break;
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default:
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diodes = "no diode,";
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break;
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}
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switch (data & 0x03) {
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case DS1343_TRICKLE_1K:
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resistors = "1k Ohm";
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break;
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case DS1343_TRICKLE_2K:
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resistors = "2k Ohm";
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break;
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case DS1343_TRICKLE_4K:
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resistors = "4k Ohm";
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break;
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default:
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diodes = "disabled";
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break;
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}
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}
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return sprintf(buf, "%s %s\n", diodes, resistors);
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}
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static DEVICE_ATTR(trickle_charger, S_IRUGO, ds1343_show_tricklecharger, NULL);
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static int ds1343_sysfs_register(struct device *dev)
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{
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int err;
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err = device_create_file(dev, &dev_attr_glitch_filter);
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if (err)
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return err;
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err = device_create_file(dev, &dev_attr_alarm_status);
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if (err)
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goto error1;
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err = device_create_file(dev, &dev_attr_alarm_mode);
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if (err)
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goto error2;
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err = device_create_file(dev, &dev_attr_trickle_charger);
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if (!err)
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return err;
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device_remove_file(dev, &dev_attr_alarm_mode);
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error2:
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device_remove_file(dev, &dev_attr_alarm_status);
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error1:
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device_remove_file(dev, &dev_attr_glitch_filter);
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return err;
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}
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static void ds1343_sysfs_unregister(struct device *dev)
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{
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device_remove_file(dev, &dev_attr_glitch_filter);
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device_remove_file(dev, &dev_attr_alarm_status);
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device_remove_file(dev, &dev_attr_alarm_mode);
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device_remove_file(dev, &dev_attr_trickle_charger);
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}
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static int ds1343_read_time(struct device *dev, struct rtc_time *dt)
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{
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struct ds1343_priv *priv = dev_get_drvdata(dev);
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unsigned char buf[7];
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int res;
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res = regmap_bulk_read(priv->map, DS1343_SECONDS_REG, buf, 7);
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if (res)
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return res;
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dt->tm_sec = bcd2bin(buf[0]);
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dt->tm_min = bcd2bin(buf[1]);
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dt->tm_hour = bcd2bin(buf[2] & 0x3F);
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dt->tm_wday = bcd2bin(buf[3]) - 1;
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dt->tm_mday = bcd2bin(buf[4]);
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dt->tm_mon = bcd2bin(buf[5] & 0x1F) - 1;
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dt->tm_year = bcd2bin(buf[6]) + 100; /* year offset from 1900 */
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return rtc_valid_tm(dt);
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}
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static int ds1343_set_time(struct device *dev, struct rtc_time *dt)
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{
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struct ds1343_priv *priv = dev_get_drvdata(dev);
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int res;
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res = regmap_write(priv->map, DS1343_SECONDS_REG,
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bin2bcd(dt->tm_sec));
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if (res)
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return res;
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res = regmap_write(priv->map, DS1343_MINUTES_REG,
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bin2bcd(dt->tm_min));
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if (res)
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return res;
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res = regmap_write(priv->map, DS1343_HOURS_REG,
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bin2bcd(dt->tm_hour) & 0x3F);
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if (res)
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return res;
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res = regmap_write(priv->map, DS1343_DAY_REG,
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bin2bcd(dt->tm_wday + 1));
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if (res)
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return res;
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res = regmap_write(priv->map, DS1343_DATE_REG,
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bin2bcd(dt->tm_mday));
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if (res)
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return res;
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res = regmap_write(priv->map, DS1343_MONTH_REG,
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bin2bcd(dt->tm_mon + 1));
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if (res)
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return res;
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dt->tm_year %= 100;
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res = regmap_write(priv->map, DS1343_YEAR_REG,
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bin2bcd(dt->tm_year));
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if (res)
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return res;
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return 0;
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}
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static int ds1343_update_alarm(struct device *dev)
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{
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struct ds1343_priv *priv = dev_get_drvdata(dev);
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unsigned int control, stat;
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unsigned char buf[4];
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int res = 0;
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res = regmap_read(priv->map, DS1343_CONTROL_REG, &control);
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if (res)
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return res;
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res = regmap_read(priv->map, DS1343_STATUS_REG, &stat);
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if (res)
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return res;
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control &= ~(DS1343_A0IE);
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stat &= ~(DS1343_IRQF0);
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res = regmap_write(priv->map, DS1343_CONTROL_REG, control);
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if (res)
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return res;
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res = regmap_write(priv->map, DS1343_STATUS_REG, stat);
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if (res)
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return res;
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buf[0] = priv->alarm_sec < 0 || (priv->irqen & RTC_UF) ?
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0x80 : bin2bcd(priv->alarm_sec) & 0x7F;
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buf[1] = priv->alarm_min < 0 || (priv->irqen & RTC_UF) ?
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0x80 : bin2bcd(priv->alarm_min) & 0x7F;
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buf[2] = priv->alarm_hour < 0 || (priv->irqen & RTC_UF) ?
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0x80 : bin2bcd(priv->alarm_hour) & 0x3F;
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buf[3] = priv->alarm_mday < 0 || (priv->irqen & RTC_UF) ?
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0x80 : bin2bcd(priv->alarm_mday) & 0x7F;
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res = regmap_bulk_write(priv->map, DS1343_ALM0_SEC_REG, buf, 4);
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if (res)
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return res;
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if (priv->irqen) {
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control |= DS1343_A0IE;
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res = regmap_write(priv->map, DS1343_CONTROL_REG, control);
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}
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return res;
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}
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static int ds1343_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
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{
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struct ds1343_priv *priv = dev_get_drvdata(dev);
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struct spi_device *spi = priv->spi;
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int res = 0;
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unsigned int stat;
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if (spi->irq <= 0)
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return -EINVAL;
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mutex_lock(&priv->mutex);
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res = regmap_read(priv->map, DS1343_STATUS_REG, &stat);
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if (res)
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goto out;
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alarm->enabled = !!(priv->irqen & RTC_AF);
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alarm->pending = !!(stat & DS1343_IRQF0);
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alarm->time.tm_sec = priv->alarm_sec < 0 ? 0 : priv->alarm_sec;
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alarm->time.tm_min = priv->alarm_min < 0 ? 0 : priv->alarm_min;
|
||||
alarm->time.tm_hour = priv->alarm_hour < 0 ? 0 : priv->alarm_hour;
|
||||
alarm->time.tm_mday = priv->alarm_mday < 0 ? 0 : priv->alarm_mday;
|
||||
|
||||
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;
|
||||
|
||||
out:
|
||||
mutex_unlock(&priv->mutex);
|
||||
return res;
|
||||
}
|
||||
|
||||
static int ds1343_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
|
||||
{
|
||||
struct ds1343_priv *priv = dev_get_drvdata(dev);
|
||||
struct spi_device *spi = priv->spi;
|
||||
int res = 0;
|
||||
|
||||
if (spi->irq <= 0)
|
||||
return -EINVAL;
|
||||
|
||||
mutex_lock(&priv->mutex);
|
||||
|
||||
priv->alarm_sec = alarm->time.tm_sec;
|
||||
priv->alarm_min = alarm->time.tm_min;
|
||||
priv->alarm_hour = alarm->time.tm_hour;
|
||||
priv->alarm_mday = alarm->time.tm_mday;
|
||||
|
||||
if (alarm->enabled)
|
||||
priv->irqen |= RTC_AF;
|
||||
|
||||
res = ds1343_update_alarm(dev);
|
||||
|
||||
mutex_unlock(&priv->mutex);
|
||||
|
||||
return res;
|
||||
}
|
||||
|
||||
static int ds1343_alarm_irq_enable(struct device *dev, unsigned int enabled)
|
||||
{
|
||||
struct ds1343_priv *priv = dev_get_drvdata(dev);
|
||||
struct spi_device *spi = priv->spi;
|
||||
int res = 0;
|
||||
|
||||
if (spi->irq <= 0)
|
||||
return -EINVAL;
|
||||
|
||||
mutex_lock(&priv->mutex);
|
||||
|
||||
if (enabled)
|
||||
priv->irqen |= RTC_AF;
|
||||
else
|
||||
priv->irqen &= ~RTC_AF;
|
||||
|
||||
res = ds1343_update_alarm(dev);
|
||||
|
||||
mutex_unlock(&priv->mutex);
|
||||
|
||||
return res;
|
||||
}
|
||||
|
||||
static irqreturn_t ds1343_thread(int irq, void *dev_id)
|
||||
{
|
||||
struct ds1343_priv *priv = dev_id;
|
||||
unsigned int stat, control;
|
||||
int res = 0;
|
||||
|
||||
mutex_lock(&priv->mutex);
|
||||
|
||||
res = regmap_read(priv->map, DS1343_STATUS_REG, &stat);
|
||||
if (res)
|
||||
goto out;
|
||||
|
||||
if (stat & DS1343_IRQF0) {
|
||||
stat &= ~DS1343_IRQF0;
|
||||
regmap_write(priv->map, DS1343_STATUS_REG, stat);
|
||||
|
||||
res = regmap_read(priv->map, DS1343_CONTROL_REG, &control);
|
||||
if (res)
|
||||
goto out;
|
||||
|
||||
control &= ~DS1343_A0IE;
|
||||
regmap_write(priv->map, DS1343_CONTROL_REG, control);
|
||||
|
||||
rtc_update_irq(priv->rtc, 1, RTC_AF | RTC_IRQF);
|
||||
}
|
||||
|
||||
out:
|
||||
mutex_unlock(&priv->mutex);
|
||||
return IRQ_HANDLED;
|
||||
}
|
||||
|
||||
static const struct rtc_class_ops ds1343_rtc_ops = {
|
||||
.ioctl = ds1343_ioctl,
|
||||
.read_time = ds1343_read_time,
|
||||
.set_time = ds1343_set_time,
|
||||
.read_alarm = ds1343_read_alarm,
|
||||
.set_alarm = ds1343_set_alarm,
|
||||
.alarm_irq_enable = ds1343_alarm_irq_enable,
|
||||
};
|
||||
|
||||
static int ds1343_probe(struct spi_device *spi)
|
||||
{
|
||||
struct ds1343_priv *priv;
|
||||
struct regmap_config config;
|
||||
unsigned int data;
|
||||
int res;
|
||||
|
||||
memset(&config, 0, sizeof(config));
|
||||
config.reg_bits = 8;
|
||||
config.val_bits = 8;
|
||||
config.write_flag_mask = 0x80;
|
||||
|
||||
priv = devm_kzalloc(&spi->dev, sizeof(struct ds1343_priv), GFP_KERNEL);
|
||||
if (!priv)
|
||||
return -ENOMEM;
|
||||
|
||||
priv->spi = spi;
|
||||
mutex_init(&priv->mutex);
|
||||
|
||||
/* RTC DS1347 works in spi mode 3 and
|
||||
* its chip select is active high
|
||||
*/
|
||||
spi->mode = SPI_MODE_3 | SPI_CS_HIGH;
|
||||
spi->bits_per_word = 8;
|
||||
res = spi_setup(spi);
|
||||
if (res)
|
||||
return res;
|
||||
|
||||
spi_set_drvdata(spi, priv);
|
||||
|
||||
priv->map = devm_regmap_init_spi(spi, &config);
|
||||
|
||||
if (IS_ERR(priv->map)) {
|
||||
dev_err(&spi->dev, "spi regmap init failed for rtc ds1343\n");
|
||||
return PTR_ERR(priv->map);
|
||||
}
|
||||
|
||||
res = regmap_read(priv->map, DS1343_SECONDS_REG, &data);
|
||||
if (res)
|
||||
return res;
|
||||
|
||||
regmap_read(priv->map, DS1343_CONTROL_REG, &data);
|
||||
data |= DS1343_INTCN;
|
||||
data &= ~(DS1343_EOSC | DS1343_A1IE | DS1343_A0IE);
|
||||
regmap_write(priv->map, DS1343_CONTROL_REG, data);
|
||||
|
||||
regmap_read(priv->map, DS1343_STATUS_REG, &data);
|
||||
data &= ~(DS1343_OSF | DS1343_IRQF1 | DS1343_IRQF0);
|
||||
regmap_write(priv->map, DS1343_STATUS_REG, data);
|
||||
|
||||
priv->rtc = devm_rtc_device_register(&spi->dev, "ds1343",
|
||||
&ds1343_rtc_ops, THIS_MODULE);
|
||||
if (IS_ERR(priv->rtc)) {
|
||||
dev_err(&spi->dev, "unable to register rtc ds1343\n");
|
||||
return PTR_ERR(priv->rtc);
|
||||
}
|
||||
|
||||
if (spi->irq >= 0) {
|
||||
res = devm_request_threaded_irq(&spi->dev, spi->irq, NULL,
|
||||
ds1343_thread,
|
||||
IRQF_NO_SUSPEND | IRQF_ONESHOT,
|
||||
"ds1343", priv);
|
||||
if (res) {
|
||||
dev_err(&spi->dev,
|
||||
"unable to request irq for rtc ds1343\n");
|
||||
return res;
|
||||
}
|
||||
|
||||
device_set_wakeup_capable(&spi->dev, 1);
|
||||
}
|
||||
|
||||
res = ds1343_sysfs_register(&spi->dev);
|
||||
if (res)
|
||||
dev_err(&spi->dev,
|
||||
"unable to create sysfs entries for rtc ds1343\n");
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int ds1343_remove(struct spi_device *spi)
|
||||
{
|
||||
struct ds1343_priv *priv = spi_get_drvdata(spi);
|
||||
|
||||
if (spi->irq) {
|
||||
mutex_lock(&priv->mutex);
|
||||
priv->irqen &= ~RTC_AF;
|
||||
mutex_unlock(&priv->mutex);
|
||||
|
||||
devm_free_irq(&spi->dev, spi->irq, priv);
|
||||
}
|
||||
|
||||
spi_set_drvdata(spi, NULL);
|
||||
|
||||
ds1343_sysfs_unregister(&spi->dev);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_PM_SLEEP
|
||||
|
||||
static int ds1343_suspend(struct device *dev)
|
||||
{
|
||||
struct spi_device *spi = to_spi_device(dev);
|
||||
|
||||
if (spi->irq >= 0 && device_may_wakeup(dev))
|
||||
enable_irq_wake(spi->irq);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int ds1343_resume(struct device *dev)
|
||||
{
|
||||
struct spi_device *spi = to_spi_device(dev);
|
||||
|
||||
if (spi->irq >= 0 && device_may_wakeup(dev))
|
||||
disable_irq_wake(spi->irq);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
#endif
|
||||
|
||||
static SIMPLE_DEV_PM_OPS(ds1343_pm, ds1343_suspend, ds1343_resume);
|
||||
|
||||
static struct spi_driver ds1343_driver = {
|
||||
.driver = {
|
||||
.name = "ds1343",
|
||||
.owner = THIS_MODULE,
|
||||
.pm = &ds1343_pm,
|
||||
},
|
||||
.probe = ds1343_probe,
|
||||
.remove = ds1343_remove,
|
||||
.id_table = ds1343_id,
|
||||
};
|
||||
|
||||
module_spi_driver(ds1343_driver);
|
||||
|
||||
MODULE_DESCRIPTION("DS1343 RTC SPI Driver");
|
||||
MODULE_AUTHOR("Raghavendra Chandra Ganiga <ravi23ganiga@gmail.com>");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
MODULE_VERSION(DS1343_DRV_VERSION);
|
||||
Loading…
Reference in New Issue