2019-06-04 02:11:33 -06:00
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// SPDX-License-Identifier: GPL-2.0-only
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2014-06-06 15:35:59 -06:00
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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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2014-08-08 15:20:01 -06:00
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* Ankur Srivastava <sankurece@gmail.com> : DS1343 Nvram Support
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2014-06-06 15:35:59 -06:00
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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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2015-09-21 09:47:02 -06:00
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#include <linux/pm_wakeirq.h>
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2014-06-06 15:35:59 -06:00
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#include <linux/slab.h>
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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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2014-08-08 15:20:01 -06:00
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#define DS1343_NVRAM 0x20
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#define DS1343_NVRAM_LEN 96
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2014-06-06 15:35:59 -06:00
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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 rtc_device *rtc;
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struct regmap *map;
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2014-06-06 15:36:01 -06:00
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int irq;
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2014-06-06 15:35:59 -06:00
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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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2019-10-19 14:49:36 -06:00
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struct ds1343_priv *priv = dev_get_drvdata(dev->parent);
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2014-06-06 15:35:59 -06:00
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int glitch_filt_status, data;
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2019-10-19 14:49:38 -06:00
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int res;
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2014-06-06 15:35:59 -06:00
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2019-10-19 14:49:38 -06:00
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res = regmap_read(priv->map, DS1343_CONTROL_REG, &data);
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if (res)
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return res;
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2014-06-06 15:35:59 -06:00
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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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2019-10-19 14:49:36 -06:00
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struct ds1343_priv *priv = dev_get_drvdata(dev->parent);
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2019-10-19 14:49:37 -06:00
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int data = 0;
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int res;
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2014-06-06 15:35:59 -06:00
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if (strncmp(buf, "enabled", 7) == 0)
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2019-10-19 14:49:37 -06:00
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data = DS1343_EGFIL;
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else if (strncmp(buf, "disabled", 8))
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2014-06-06 15:35:59 -06:00
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return -EINVAL;
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2019-10-19 14:49:37 -06:00
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res = regmap_update_bits(priv->map, DS1343_CONTROL_REG,
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DS1343_EGFIL, data);
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if (res)
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return res;
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2014-06-06 15:35:59 -06:00
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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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2018-02-12 15:47:38 -07:00
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static int ds1343_nvram_write(void *priv, unsigned int off, void *val,
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size_t bytes)
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2014-08-08 15:20:01 -06:00
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{
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2018-02-12 15:47:38 -07:00
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struct ds1343_priv *ds1343 = priv;
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2014-08-08 15:20:01 -06:00
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2018-02-12 15:47:38 -07:00
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return regmap_bulk_write(ds1343->map, DS1343_NVRAM + off, val, bytes);
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2014-08-08 15:20:01 -06:00
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}
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2018-02-12 15:47:38 -07:00
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static int ds1343_nvram_read(void *priv, unsigned int off, void *val,
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size_t bytes)
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2014-08-08 15:20:01 -06:00
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{
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2018-02-12 15:47:38 -07:00
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struct ds1343_priv *ds1343 = priv;
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2014-08-08 15:20:01 -06:00
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2018-02-12 15:47:38 -07:00
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return regmap_bulk_read(ds1343->map, DS1343_NVRAM + off, val, bytes);
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2014-08-08 15:20:01 -06:00
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}
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2014-06-06 15:35:59 -06:00
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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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2019-10-19 14:49:36 -06:00
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struct ds1343_priv *priv = dev_get_drvdata(dev->parent);
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2019-10-19 14:49:38 -06:00
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int res, data;
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2014-06-06 15:35:59 -06:00
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char *diodes = "disabled", *resistors = " ";
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2019-10-19 14:49:38 -06:00
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res = regmap_read(priv->map, DS1343_TRICKLE_REG, &data);
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if (res)
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return res;
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2014-06-06 15:35:59 -06:00
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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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2019-10-19 14:49:36 -06:00
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static struct attribute *ds1343_attrs[] = {
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&dev_attr_glitch_filter.attr,
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&dev_attr_trickle_charger.attr,
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NULL
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};
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2014-06-06 15:35:59 -06:00
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2019-10-19 14:49:36 -06:00
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static const struct attribute_group ds1343_attr_group = {
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.attrs = ds1343_attrs,
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};
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2014-06-06 15:35:59 -06:00
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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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2018-02-19 08:23:56 -07:00
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return 0;
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2014-06-06 15:35:59 -06:00
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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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2019-10-19 14:49:35 -06:00
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u8 buf[7];
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buf[0] = bin2bcd(dt->tm_sec);
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buf[1] = bin2bcd(dt->tm_min);
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buf[2] = bin2bcd(dt->tm_hour) & 0x3F;
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buf[3] = bin2bcd(dt->tm_wday + 1);
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buf[4] = bin2bcd(dt->tm_mday);
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buf[5] = bin2bcd(dt->tm_mon + 1);
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buf[6] = bin2bcd(dt->tm_year - 100);
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return regmap_bulk_write(priv->map, DS1343_SECONDS_REG,
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buf, sizeof(buf));
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2014-06-06 15:35:59 -06:00
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}
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2019-10-19 14:49:40 -06:00
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static int ds1343_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
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2014-06-06 15:35:59 -06:00
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{
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struct ds1343_priv *priv = dev_get_drvdata(dev);
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unsigned char buf[4];
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2019-10-19 14:49:40 -06:00
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unsigned int val;
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int res;
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2014-06-06 15:35:59 -06:00
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2019-10-19 14:49:40 -06:00
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if (priv->irq <= 0)
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return -EINVAL;
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2014-06-06 15:35:59 -06:00
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2019-10-19 14:49:40 -06:00
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res = regmap_read(priv->map, DS1343_STATUS_REG, &val);
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2014-06-06 15:35:59 -06:00
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if (res)
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return res;
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2019-10-19 14:49:40 -06:00
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alarm->pending = !!(val & DS1343_IRQF0);
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2014-06-06 15:35:59 -06:00
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2019-10-19 14:49:40 -06:00
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res = regmap_read(priv->map, DS1343_CONTROL_REG, &val);
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2014-06-06 15:35:59 -06:00
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if (res)
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return res;
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2019-10-19 14:49:40 -06:00
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alarm->enabled = !!(val & DS1343_A0IE);
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2014-06-06 15:35:59 -06:00
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2019-10-19 14:49:40 -06:00
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res = regmap_bulk_read(priv->map, DS1343_ALM0_SEC_REG, buf, 4);
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2014-06-06 15:35:59 -06:00
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if (res)
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return res;
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2019-10-19 14:49:40 -06:00
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alarm->time.tm_sec = bcd2bin(buf[0]) & 0x7f;
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alarm->time.tm_min = bcd2bin(buf[1]) & 0x7f;
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alarm->time.tm_hour = bcd2bin(buf[2]) & 0x3f;
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alarm->time.tm_mday = bcd2bin(buf[3]) & 0x3f;
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2014-06-06 15:35:59 -06:00
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2019-10-19 14:49:40 -06:00
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return 0;
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2014-06-06 15:35:59 -06:00
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}
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2019-10-19 14:49:40 -06:00
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static int ds1343_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
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2014-06-06 15:35:59 -06:00
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{
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struct ds1343_priv *priv = dev_get_drvdata(dev);
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2019-10-19 14:49:40 -06:00
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unsigned char buf[4];
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int res = 0;
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2014-06-06 15:35:59 -06:00
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2014-06-06 15:36:01 -06:00
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if (priv->irq <= 0)
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2014-06-06 15:35:59 -06:00
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return -EINVAL;
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2019-10-19 14:49:40 -06:00
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res = regmap_update_bits(priv->map, DS1343_CONTROL_REG, DS1343_A0IE, 0);
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2014-06-06 15:35:59 -06:00
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if (res)
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2019-10-19 14:49:39 -06:00
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return res;
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2014-06-06 15:35:59 -06:00
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2019-10-19 14:49:40 -06:00
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buf[0] = bin2bcd(alarm->time.tm_sec);
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buf[1] = bin2bcd(alarm->time.tm_min);
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buf[2] = bin2bcd(alarm->time.tm_hour);
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buf[3] = bin2bcd(alarm->time.tm_mday);
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2014-06-06 15:35:59 -06:00
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2019-10-19 14:49:40 -06:00
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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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2014-06-06 15:35:59 -06:00
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if (alarm->enabled)
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2019-10-19 14:49:40 -06:00
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res = regmap_update_bits(priv->map, DS1343_CONTROL_REG,
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DS1343_A0IE, DS1343_A0IE);
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2014-06-06 15:35:59 -06:00
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2019-10-19 14:49:40 -06:00
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return res;
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2014-06-06 15:35:59 -06:00
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}
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static int ds1343_alarm_irq_enable(struct device *dev, unsigned int enabled)
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|
{
|
|
|
|
struct ds1343_priv *priv = dev_get_drvdata(dev);
|
|
|
|
|
2014-06-06 15:36:01 -06:00
|
|
|
if (priv->irq <= 0)
|
2014-06-06 15:35:59 -06:00
|
|
|
return -EINVAL;
|
|
|
|
|
2019-10-19 14:49:40 -06:00
|
|
|
return regmap_update_bits(priv->map, DS1343_CONTROL_REG,
|
|
|
|
DS1343_A0IE, enabled ? DS1343_A0IE : 0);
|
2014-06-06 15:35:59 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
static irqreturn_t ds1343_thread(int irq, void *dev_id)
|
|
|
|
{
|
|
|
|
struct ds1343_priv *priv = dev_id;
|
2019-10-19 14:49:40 -06:00
|
|
|
unsigned int stat;
|
2014-06-06 15:35:59 -06:00
|
|
|
int res = 0;
|
|
|
|
|
2019-10-19 14:49:39 -06:00
|
|
|
rtc_lock(priv->rtc);
|
2014-06-06 15:35:59 -06:00
|
|
|
|
|
|
|
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);
|
|
|
|
|
|
|
|
rtc_update_irq(priv->rtc, 1, RTC_AF | RTC_IRQF);
|
2019-10-19 14:49:40 -06:00
|
|
|
|
|
|
|
regmap_update_bits(priv->map, DS1343_CONTROL_REG,
|
|
|
|
DS1343_A0IE, 0);
|
2014-06-06 15:35:59 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
out:
|
2019-10-19 14:49:39 -06:00
|
|
|
rtc_unlock(priv->rtc);
|
2014-06-06 15:35:59 -06:00
|
|
|
return IRQ_HANDLED;
|
|
|
|
}
|
|
|
|
|
|
|
|
static const struct rtc_class_ops ds1343_rtc_ops = {
|
|
|
|
.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;
|
2018-02-12 15:47:35 -07:00
|
|
|
struct regmap_config config = { .reg_bits = 8, .val_bits = 8,
|
|
|
|
.write_flag_mask = 0x80, };
|
2014-06-06 15:35:59 -06:00
|
|
|
unsigned int data;
|
|
|
|
int res;
|
2018-02-12 15:47:38 -07:00
|
|
|
struct nvmem_config nvmem_cfg = {
|
|
|
|
.name = "ds1343-",
|
|
|
|
.word_size = 1,
|
|
|
|
.stride = 1,
|
|
|
|
.size = DS1343_NVRAM_LEN,
|
|
|
|
.reg_read = ds1343_nvram_read,
|
|
|
|
.reg_write = ds1343_nvram_write,
|
|
|
|
};
|
2014-06-06 15:35:59 -06:00
|
|
|
|
|
|
|
priv = devm_kzalloc(&spi->dev, sizeof(struct ds1343_priv), GFP_KERNEL);
|
|
|
|
if (!priv)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
/* RTC DS1347 works in spi mode 3 and
|
2019-12-04 15:57:31 -07:00
|
|
|
* its chip select is active high. Active high should be defined as
|
|
|
|
* "inverse polarity" as GPIO-based chip selects can be logically
|
|
|
|
* active high but inverted by the GPIO library.
|
2014-06-06 15:35:59 -06:00
|
|
|
*/
|
2019-12-04 15:57:31 -07:00
|
|
|
spi->mode |= SPI_MODE_3;
|
|
|
|
spi->mode ^= SPI_CS_HIGH;
|
2014-06-06 15:35:59 -06:00
|
|
|
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);
|
|
|
|
|
2018-02-12 15:47:36 -07:00
|
|
|
priv->rtc = devm_rtc_allocate_device(&spi->dev);
|
|
|
|
if (IS_ERR(priv->rtc))
|
2014-06-06 15:35:59 -06:00
|
|
|
return PTR_ERR(priv->rtc);
|
2018-02-12 15:47:36 -07:00
|
|
|
|
2018-02-12 15:47:38 -07:00
|
|
|
priv->rtc->nvram_old_abi = true;
|
2018-02-12 15:47:36 -07:00
|
|
|
priv->rtc->ops = &ds1343_rtc_ops;
|
2019-10-19 14:49:33 -06:00
|
|
|
priv->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
|
|
|
|
priv->rtc->range_max = RTC_TIMESTAMP_END_2099;
|
2018-02-12 15:47:36 -07:00
|
|
|
|
2019-10-19 14:49:36 -06:00
|
|
|
res = rtc_add_group(priv->rtc, &ds1343_attr_group);
|
|
|
|
if (res)
|
|
|
|
dev_err(&spi->dev,
|
|
|
|
"unable to create sysfs entries for rtc ds1343\n");
|
|
|
|
|
2018-02-12 15:47:36 -07:00
|
|
|
res = rtc_register_device(priv->rtc);
|
|
|
|
if (res)
|
|
|
|
return res;
|
2014-06-06 15:35:59 -06:00
|
|
|
|
2018-02-12 15:47:38 -07:00
|
|
|
nvmem_cfg.priv = priv;
|
|
|
|
rtc_nvmem_register(priv->rtc, &nvmem_cfg);
|
|
|
|
|
2014-06-06 15:36:01 -06:00
|
|
|
priv->irq = spi->irq;
|
|
|
|
|
|
|
|
if (priv->irq >= 0) {
|
2014-06-06 15:35:59 -06:00
|
|
|
res = devm_request_threaded_irq(&spi->dev, spi->irq, NULL,
|
2015-09-21 09:47:02 -06:00
|
|
|
ds1343_thread, IRQF_ONESHOT,
|
2014-06-06 15:35:59 -06:00
|
|
|
"ds1343", priv);
|
|
|
|
if (res) {
|
2014-06-06 15:36:01 -06:00
|
|
|
priv->irq = -1;
|
2014-06-06 15:35:59 -06:00
|
|
|
dev_err(&spi->dev,
|
|
|
|
"unable to request irq for rtc ds1343\n");
|
2014-06-06 15:36:01 -06:00
|
|
|
} else {
|
2015-09-21 09:47:02 -06:00
|
|
|
device_init_wakeup(&spi->dev, true);
|
|
|
|
dev_pm_set_wake_irq(&spi->dev, spi->irq);
|
2014-06-06 15:35:59 -06:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int ds1343_remove(struct spi_device *spi)
|
|
|
|
{
|
2019-10-19 14:49:41 -06:00
|
|
|
dev_pm_clear_wake_irq(&spi->dev);
|
2014-06-06 15:35:59 -06:00
|
|
|
|
|
|
|
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",
|
|
|
|
.pm = &ds1343_pm,
|
|
|
|
},
|
|
|
|
.probe = ds1343_probe,
|
|
|
|
.remove = ds1343_remove,
|
|
|
|
.id_table = ds1343_id,
|
|
|
|
};
|
|
|
|
|
|
|
|
module_spi_driver(ds1343_driver);
|
|
|
|
|
|
|
|
MODULE_DESCRIPTION("DS1343 RTC SPI Driver");
|
2014-08-08 15:20:01 -06:00
|
|
|
MODULE_AUTHOR("Raghavendra Chandra Ganiga <ravi23ganiga@gmail.com>,"
|
|
|
|
"Ankur Srivastava <sankurece@gmail.com>");
|
2014-06-06 15:35:59 -06:00
|
|
|
MODULE_LICENSE("GPL v2");
|