[mirror_ubuntu-artful-kernel.git] / drivers / rtc / rtc-ds1343.c

/* rtc-ds1343.c
 *
 * Driver for Dallas Semiconductor DS1343 Low Current, SPI Compatible
 * Real Time Clock
 *
 * Author : Raghavendra Chandra Ganiga <ravi23ganiga@gmail.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/device.h>
#include <linux/spi/spi.h>
#include <linux/regmap.h>
#include <linux/rtc.h>
#include <linux/bcd.h>
#include <linux/pm.h>
#include <linux/slab.h>

#define DS1343_DRV_VERSION	"01.00"
#define DALLAS_MAXIM_DS1343	0
#define DALLAS_MAXIM_DS1344	1

/* RTC DS1343 Registers */
#define DS1343_SECONDS_REG	0x00
#define DS1343_MINUTES_REG	0x01
#define DS1343_HOURS_REG	0x02
#define DS1343_DAY_REG		0x03
#define DS1343_DATE_REG		0x04
#define DS1343_MONTH_REG	0x05
#define DS1343_YEAR_REG		0x06
#define DS1343_ALM0_SEC_REG	0x07
#define DS1343_ALM0_MIN_REG	0x08
#define DS1343_ALM0_HOUR_REG	0x09
#define DS1343_ALM0_DAY_REG	0x0A
#define DS1343_ALM1_SEC_REG	0x0B
#define DS1343_ALM1_MIN_REG	0x0C
#define DS1343_ALM1_HOUR_REG	0x0D
#define DS1343_ALM1_DAY_REG	0x0E
#define DS1343_CONTROL_REG	0x0F
#define DS1343_STATUS_REG	0x10
#define DS1343_TRICKLE_REG	0x11

/* DS1343 Control Registers bits */
#define DS1343_EOSC		0x80
#define DS1343_DOSF		0x20
#define DS1343_EGFIL		0x10
#define DS1343_SQW		0x08
#define DS1343_INTCN		0x04
#define DS1343_A1IE		0x02
#define DS1343_A0IE		0x01

/* DS1343 Status Registers bits */
#define DS1343_OSF		0x80
#define DS1343_IRQF1		0x02
#define DS1343_IRQF0		0x01

/* DS1343 Trickle Charger Registers bits */
#define DS1343_TRICKLE_MAGIC	0xa0
#define DS1343_TRICKLE_DS1	0x08
#define DS1343_TRICKLE_1K	0x01
#define DS1343_TRICKLE_2K	0x02
#define DS1343_TRICKLE_4K	0x03

static const struct spi_device_id ds1343_id[] = {
	{ "ds1343", DALLAS_MAXIM_DS1343 },
	{ "ds1344", DALLAS_MAXIM_DS1344 },
	{ }
};
MODULE_DEVICE_TABLE(spi, ds1343_id);

struct ds1343_priv {
	struct spi_device *spi;
	struct rtc_device *rtc;
	struct regmap *map;
	struct mutex mutex;
	unsigned int irqen;
	int alarm_sec;
	int alarm_min;
	int alarm_hour;
	int alarm_mday;
};

static int ds1343_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
{
	switch (cmd) {
#ifdef RTC_SET_CHARGE
	case RTC_SET_CHARGE:
	{
		int val;

		if (copy_from_user(&val, (int __user *)arg, sizeof(int)))
			return -EFAULT;

		return regmap_write(priv->map, DS1343_TRICKLE_REG, val);
	}
	break;
#endif
	}

	return -ENOIOCTLCMD;
}

static ssize_t ds1343_show_glitchfilter(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	struct ds1343_priv *priv = dev_get_drvdata(dev);
	int glitch_filt_status, data;

	regmap_read(priv->map, DS1343_CONTROL_REG, &data);

	glitch_filt_status = !!(data & DS1343_EGFIL);

	if (glitch_filt_status)
		return sprintf(buf, "enabled\n");
	else
		return sprintf(buf, "disabled\n");
}

static ssize_t ds1343_store_glitchfilter(struct device *dev,
					struct device_attribute *attr,
					const char *buf, size_t count)
{
	struct ds1343_priv *priv = dev_get_drvdata(dev);
	int data;

	regmap_read(priv->map, DS1343_CONTROL_REG, &data);

	if (strncmp(buf, "enabled", 7) == 0)
		data |= DS1343_EGFIL;

	else if (strncmp(buf, "disabled", 8) == 0)
		data &= ~(DS1343_EGFIL);

	else
		return -EINVAL;

	regmap_write(priv->map, DS1343_CONTROL_REG, data);

	return count;
}

static DEVICE_ATTR(glitch_filter, S_IRUGO | S_IWUSR, ds1343_show_glitchfilter,
			ds1343_store_glitchfilter);

static ssize_t ds1343_show_alarmstatus(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	struct ds1343_priv *priv = dev_get_drvdata(dev);
	int alarmstatus, data;

	regmap_read(priv->map, DS1343_CONTROL_REG, &data);

	alarmstatus = !!(data & DS1343_A0IE);

	if (alarmstatus)
		return sprintf(buf, "enabled\n");
	else
		return sprintf(buf, "disabled\n");
}

static DEVICE_ATTR(alarm_status, S_IRUGO, ds1343_show_alarmstatus, NULL);

static ssize_t ds1343_show_alarmmode(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	struct ds1343_priv *priv = dev_get_drvdata(dev);
	int alarm_mode, data;
	char *alarm_str;

	regmap_read(priv->map, DS1343_ALM0_SEC_REG, &data);
	alarm_mode = (data & 0x80) >> 4;

	regmap_read(priv->map, DS1343_ALM0_MIN_REG, &data);
	alarm_mode |= (data & 0x80) >> 5;

	regmap_read(priv->map, DS1343_ALM0_HOUR_REG, &data);
	alarm_mode |= (data & 0x80) >> 6;

	regmap_read(priv->map, DS1343_ALM0_DAY_REG, &data);
	alarm_mode |= (data & 0x80) >> 7;

	switch (alarm_mode) {
	case 15:
		alarm_str = "each second";
		break;

	case 7:
		alarm_str = "seconds match";
		break;

	case 3:
		alarm_str = "minutes and seconds match";
		break;

	case 1:
		alarm_str = "hours, minutes and seconds match";
		break;

	case 0:
		alarm_str = "day, hours, minutes and seconds match";
		break;

	default:
		alarm_str = "invalid";
		break;
	}

	return sprintf(buf, "%s\n", alarm_str);
}

static DEVICE_ATTR(alarm_mode, S_IRUGO, ds1343_show_alarmmode, NULL);

static ssize_t ds1343_show_tricklecharger(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	struct ds1343_priv *priv = dev_get_drvdata(dev);
	int data;
	char *diodes = "disabled", *resistors = " ";

	regmap_read(priv->map, DS1343_TRICKLE_REG, &data);

	if ((data & 0xf0) == DS1343_TRICKLE_MAGIC) {
		switch (data & 0x0c) {
		case DS1343_TRICKLE_DS1:
			diodes = "one diode,";
			break;

		default:
			diodes = "no diode,";
			break;
		}

		switch (data & 0x03) {
		case DS1343_TRICKLE_1K:
			resistors = "1k Ohm";
			break;

		case DS1343_TRICKLE_2K:
			resistors = "2k Ohm";
			break;

		case DS1343_TRICKLE_4K:
			resistors = "4k Ohm";
			break;

		default:
			diodes = "disabled";
			break;
		}
	}

	return sprintf(buf, "%s %s\n", diodes, resistors);
}

static DEVICE_ATTR(trickle_charger, S_IRUGO, ds1343_show_tricklecharger, NULL);

static int ds1343_sysfs_register(struct device *dev)
{
	int err;

	err = device_create_file(dev, &dev_attr_glitch_filter);
	if (err)
		return err;

	err = device_create_file(dev, &dev_attr_alarm_status);
	if (err)
		goto error1;

	err = device_create_file(dev, &dev_attr_alarm_mode);
	if (err)
		goto error2;

	err = device_create_file(dev, &dev_attr_trickle_charger);
	if (!err)
		return err;

	device_remove_file(dev, &dev_attr_alarm_mode);

error2:
	device_remove_file(dev, &dev_attr_alarm_status);

error1:
	device_remove_file(dev, &dev_attr_glitch_filter);

	return err;
}

static void ds1343_sysfs_unregister(struct device *dev)
{
	device_remove_file(dev, &dev_attr_glitch_filter);
	device_remove_file(dev, &dev_attr_alarm_status);
	device_remove_file(dev, &dev_attr_alarm_mode);
	device_remove_file(dev, &dev_attr_trickle_charger);
}

static int ds1343_read_time(struct device *dev, struct rtc_time *dt)
{
	struct ds1343_priv *priv = dev_get_drvdata(dev);
	unsigned char buf[7];
	int res;

	res = regmap_bulk_read(priv->map, DS1343_SECONDS_REG, buf, 7);
	if (res)
		return res;

	dt->tm_sec	= bcd2bin(buf[0]);
	dt->tm_min	= bcd2bin(buf[1]);
	dt->tm_hour	= bcd2bin(buf[2] & 0x3F);
	dt->tm_wday	= bcd2bin(buf[3]) - 1;
	dt->tm_mday	= bcd2bin(buf[4]);
	dt->tm_mon	= bcd2bin(buf[5] & 0x1F) - 1;
	dt->tm_year	= bcd2bin(buf[6]) + 100; /* year offset from 1900 */

	return rtc_valid_tm(dt);
}

static int ds1343_set_time(struct device *dev, struct rtc_time *dt)
{
	struct ds1343_priv *priv = dev_get_drvdata(dev);
	int res;

	res = regmap_write(priv->map, DS1343_SECONDS_REG,
				bin2bcd(dt->tm_sec));
	if (res)
		return res;

	res = regmap_write(priv->map, DS1343_MINUTES_REG,
				bin2bcd(dt->tm_min));
	if (res)
		return res;

	res = regmap_write(priv->map, DS1343_HOURS_REG,
				bin2bcd(dt->tm_hour) & 0x3F);
	if (res)
		return res;

	res = regmap_write(priv->map, DS1343_DAY_REG,
				bin2bcd(dt->tm_wday + 1));
	if (res)
		return res;

	res = regmap_write(priv->map, DS1343_DATE_REG,
				bin2bcd(dt->tm_mday));
	if (res)
		return res;

	res = regmap_write(priv->map, DS1343_MONTH_REG,
				bin2bcd(dt->tm_mon + 1));
	if (res)
		return res;

	dt->tm_year %= 100;

	res = regmap_write(priv->map, DS1343_YEAR_REG,
				bin2bcd(dt->tm_year));
	if (res)
		return res;

	return 0;
}

static int ds1343_update_alarm(struct device *dev)
{
	struct ds1343_priv *priv = dev_get_drvdata(dev);
	unsigned int control, stat;
	unsigned char buf[4];
	int res = 0;

	res = regmap_read(priv->map, DS1343_CONTROL_REG, &control);
	if (res)
		return res;

	res = regmap_read(priv->map, DS1343_STATUS_REG, &stat);
	if (res)
		return res;

	control &= ~(DS1343_A0IE);
	stat &= ~(DS1343_IRQF0);

	res = regmap_write(priv->map, DS1343_CONTROL_REG, control);
	if (res)
		return res;

	res = regmap_write(priv->map, DS1343_STATUS_REG, stat);
	if (res)
		return res;

	buf[0] = priv->alarm_sec < 0 || (priv->irqen & RTC_UF) ?
		0x80 : bin2bcd(priv->alarm_sec) & 0x7F;
	buf[1] = priv->alarm_min < 0 || (priv->irqen & RTC_UF) ?
		0x80 : bin2bcd(priv->alarm_min) & 0x7F;
	buf[2] = priv->alarm_hour < 0 || (priv->irqen & RTC_UF) ?
		0x80 : bin2bcd(priv->alarm_hour) & 0x3F;
	buf[3] = priv->alarm_mday < 0 || (priv->irqen & RTC_UF) ?
		0x80 : bin2bcd(priv->alarm_mday) & 0x7F;

	res = regmap_bulk_write(priv->map, DS1343_ALM0_SEC_REG, buf, 4);
	if (res)
		return res;

	if (priv->irqen) {
		control |= DS1343_A0IE;
		res = regmap_write(priv->map, DS1343_CONTROL_REG, control);
	}

	return res;
}

static int ds1343_read_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;
	unsigned int stat;

	if (spi->irq <= 0)
		return -EINVAL;

	mutex_lock(&priv->mutex);

	res = regmap_read(priv->map, DS1343_STATUS_REG, &stat);
	if (res)
		goto out;

	alarm->enabled = !!(priv->irqen & RTC_AF);
	alarm->pending = !!(stat & DS1343_IRQF0);

	alarm->time.tm_sec = priv->alarm_sec < 0 ? 0 : priv->alarm_sec;
	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);
Commit	Line	Data
1d6316f5 RG	1	/* rtc-ds1343.c
	2	*
	3	* Driver for Dallas Semiconductor DS1343 Low Current, SPI Compatible
	4	* Real Time Clock
	5	*
	6	* Author : Raghavendra Chandra Ganiga <ravi23ganiga@gmail.com>
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License version 2 as
	10	* published by the Free Software Foundation.
	11	*
	12	*/
	13
	14	#include <linux/init.h>
	15	#include <linux/module.h>
	16	#include <linux/interrupt.h>
	17	#include <linux/device.h>
	18	#include <linux/spi/spi.h>
	19	#include <linux/regmap.h>
	20	#include <linux/rtc.h>
	21	#include <linux/bcd.h>
	22	#include <linux/pm.h>
	23	#include <linux/slab.h>
	24
	25	#define DS1343_DRV_VERSION "01.00"
	26	#define DALLAS_MAXIM_DS1343 0
	27	#define DALLAS_MAXIM_DS1344 1
	28
	29	/* RTC DS1343 Registers */
	30	#define DS1343_SECONDS_REG 0x00
	31	#define DS1343_MINUTES_REG 0x01
	32	#define DS1343_HOURS_REG 0x02
	33	#define DS1343_DAY_REG 0x03
	34	#define DS1343_DATE_REG 0x04
	35	#define DS1343_MONTH_REG 0x05
	36	#define DS1343_YEAR_REG 0x06
	37	#define DS1343_ALM0_SEC_REG 0x07
	38	#define DS1343_ALM0_MIN_REG 0x08
	39	#define DS1343_ALM0_HOUR_REG 0x09
	40	#define DS1343_ALM0_DAY_REG 0x0A
	41	#define DS1343_ALM1_SEC_REG 0x0B
	42	#define DS1343_ALM1_MIN_REG 0x0C
	43	#define DS1343_ALM1_HOUR_REG 0x0D
	44	#define DS1343_ALM1_DAY_REG 0x0E
	45	#define DS1343_CONTROL_REG 0x0F
	46	#define DS1343_STATUS_REG 0x10
	47	#define DS1343_TRICKLE_REG 0x11
	48
	49	/* DS1343 Control Registers bits */
	50	#define DS1343_EOSC 0x80
	51	#define DS1343_DOSF 0x20
	52	#define DS1343_EGFIL 0x10
	53	#define DS1343_SQW 0x08
	54	#define DS1343_INTCN 0x04
	55	#define DS1343_A1IE 0x02
	56	#define DS1343_A0IE 0x01
	57
	58	/* DS1343 Status Registers bits */
	59	#define DS1343_OSF 0x80
	60	#define DS1343_IRQF1 0x02
	61	#define DS1343_IRQF0 0x01
	62
	63	/* DS1343 Trickle Charger Registers bits */
	64	#define DS1343_TRICKLE_MAGIC 0xa0
65	#define DS1343_TRICKLE_DS1 0x08
66	#define DS1343_TRICKLE_1K 0x01
67	#define DS1343_TRICKLE_2K 0x02
68	#define DS1343_TRICKLE_4K 0x03
69
70	static const struct spi_device_id ds1343_id[] = {
71	{ "ds1343", DALLAS_MAXIM_DS1343 },
72	{ "ds1344", DALLAS_MAXIM_DS1344 },
73	{ }
74	};
75	MODULE_DEVICE_TABLE(spi, ds1343_id);
76
77	struct ds1343_priv {
78	struct spi_device *spi;
79	struct rtc_device *rtc;
80	struct regmap *map;
81	struct mutex mutex;
82	unsigned int irqen;
83	int alarm_sec;
84	int alarm_min;
85	int alarm_hour;
86	int alarm_mday;
87	};
88
89	static int ds1343_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
90	{
91	switch (cmd) {
92	#ifdef RTC_SET_CHARGE
93	case RTC_SET_CHARGE:
94	{
95	int val;
96
97	if (copy_from_user(&val, (int __user *)arg, sizeof(int)))
98	return -EFAULT;
99
100	return regmap_write(priv->map, DS1343_TRICKLE_REG, val);
101	}
102	break;
103	#endif
104	}
105
106	return -ENOIOCTLCMD;
107	}
108
109	static ssize_t ds1343_show_glitchfilter(struct device *dev,
110	struct device_attribute attr, char buf)
111	{
112	struct ds1343_priv *priv = dev_get_drvdata(dev);
113	int glitch_filt_status, data;
114
115	regmap_read(priv->map, DS1343_CONTROL_REG, &data);
116
117	glitch_filt_status = !!(data & DS1343_EGFIL);
118
119	if (glitch_filt_status)
120	return sprintf(buf, "enabled\n");
121	else
122	return sprintf(buf, "disabled\n");
123	}
124
125	static ssize_t ds1343_store_glitchfilter(struct device *dev,
126	struct device_attribute *attr,
127	const char *buf, size_t count)
128	{
129	struct ds1343_priv *priv = dev_get_drvdata(dev);
130	int data;
131
132	regmap_read(priv->map, DS1343_CONTROL_REG, &data);
133
134	if (strncmp(buf, "enabled", 7) == 0)
135	data \|= DS1343_EGFIL;
136
137	else if (strncmp(buf, "disabled", 8) == 0)
138	data &= ~(DS1343_EGFIL);
139
140	else
141	return -EINVAL;
142
143	regmap_write(priv->map, DS1343_CONTROL_REG, data);
144
145	return count;
146	}
147
148	static DEVICE_ATTR(glitch_filter, S_IRUGO \| S_IWUSR, ds1343_show_glitchfilter,
149	ds1343_store_glitchfilter);
150
151	static ssize_t ds1343_show_alarmstatus(struct device *dev,
152	struct device_attribute attr, char buf)
153	{
154	struct ds1343_priv *priv = dev_get_drvdata(dev);
155	int alarmstatus, data;
156
157	regmap_read(priv->map, DS1343_CONTROL_REG, &data);
158
159	alarmstatus = !!(data & DS1343_A0IE);
160
161	if (alarmstatus)
162	return sprintf(buf, "enabled\n");
163	else
164	return sprintf(buf, "disabled\n");
165	}
166
167	static DEVICE_ATTR(alarm_status, S_IRUGO, ds1343_show_alarmstatus, NULL);
168
169	static ssize_t ds1343_show_alarmmode(struct device *dev,
170	struct device_attribute attr, char buf)
171	{
172	struct ds1343_priv *priv = dev_get_drvdata(dev);
173	int alarm_mode, data;
174	char *alarm_str;
175
176	regmap_read(priv->map, DS1343_ALM0_SEC_REG, &data);
177	alarm_mode = (data & 0x80) >> 4;
178
179	regmap_read(priv->map, DS1343_ALM0_MIN_REG, &data);
180	alarm_mode \|= (data & 0x80) >> 5;
181
182	regmap_read(priv->map, DS1343_ALM0_HOUR_REG, &data);
183	alarm_mode \|= (data & 0x80) >> 6;
184
185	regmap_read(priv->map, DS1343_ALM0_DAY_REG, &data);
186	alarm_mode \|= (data & 0x80) >> 7;
187
188	switch (alarm_mode) {
189	case 15:
190	alarm_str = "each second";
191	break;
192
193	case 7:
194	alarm_str = "seconds match";
195	break;
196
197	case 3:
198	alarm_str = "minutes and seconds match";
199	break;
200
201	case 1:
202	alarm_str = "hours, minutes and seconds match";
203	break;
204
205	case 0:
206	alarm_str = "day, hours, minutes and seconds match";
207	break;
208
209	default:
210	alarm_str = "invalid";
211	break;
212	}
213
214	return sprintf(buf, "%s\n", alarm_str);
215	}
216
217	static DEVICE_ATTR(alarm_mode, S_IRUGO, ds1343_show_alarmmode, NULL);
218
219	static ssize_t ds1343_show_tricklecharger(struct device *dev,
220	struct device_attribute attr, char buf)
221	{
222	struct ds1343_priv *priv = dev_get_drvdata(dev);
223	int data;
224	char diodes = "disabled", resistors = " ";
225
226	regmap_read(priv->map, DS1343_TRICKLE_REG, &data);
227
228	if ((data & 0xf0) == DS1343_TRICKLE_MAGIC) {
229	switch (data & 0x0c) {
230	case DS1343_TRICKLE_DS1:
231	diodes = "one diode,";
232	break;
233
234	default:
235	diodes = "no diode,";
236	break;
237	}
238
239	switch (data & 0x03) {
240	case DS1343_TRICKLE_1K:
241	resistors = "1k Ohm";
242	break;
243
244	case DS1343_TRICKLE_2K:
245	resistors = "2k Ohm";
246	break;
247
248	case DS1343_TRICKLE_4K:
249	resistors = "4k Ohm";
250	break;
251
252	default:
253	diodes = "disabled";
254	break;
255	}
256	}
257
258	return sprintf(buf, "%s %s\n", diodes, resistors);
259	}
260
261	static DEVICE_ATTR(trickle_charger, S_IRUGO, ds1343_show_tricklecharger, NULL);
262
263	static int ds1343_sysfs_register(struct device *dev)
264	{
265	int err;
266
267	err = device_create_file(dev, &dev_attr_glitch_filter);
268	if (err)
269	return err;
270
271	err = device_create_file(dev, &dev_attr_alarm_status);
272	if (err)
273	goto error1;
274
275	err = device_create_file(dev, &dev_attr_alarm_mode);
276	if (err)
277	goto error2;
278
279	err = device_create_file(dev, &dev_attr_trickle_charger);
280	if (!err)
281	return err;
282
283	device_remove_file(dev, &dev_attr_alarm_mode);
284
285	error2:
286	device_remove_file(dev, &dev_attr_alarm_status);
287
288	error1:
289	device_remove_file(dev, &dev_attr_glitch_filter);
290
291	return err;
292	}
293
294	static void ds1343_sysfs_unregister(struct device *dev)
295	{
296	device_remove_file(dev, &dev_attr_glitch_filter);
297	device_remove_file(dev, &dev_attr_alarm_status);
298	device_remove_file(dev, &dev_attr_alarm_mode);
299	device_remove_file(dev, &dev_attr_trickle_charger);
300	}
301
302	static int ds1343_read_time(struct device dev, struct rtc_time dt)
303	{
304	struct ds1343_priv *priv = dev_get_drvdata(dev);
305	unsigned char buf[7];
306	int res;
307
308	res = regmap_bulk_read(priv->map, DS1343_SECONDS_REG, buf, 7);
309	if (res)
310	return res;
311
312	dt->tm_sec = bcd2bin(buf[0]);
313	dt->tm_min = bcd2bin(buf[1]);
314	dt->tm_hour = bcd2bin(buf[2] & 0x3F);
315	dt->tm_wday = bcd2bin(buf[3]) - 1;
316	dt->tm_mday = bcd2bin(buf[4]);
317	dt->tm_mon = bcd2bin(buf[5] & 0x1F) - 1;
318	dt->tm_year = bcd2bin(buf[6]) + 100; /* year offset from 1900 */
319
320	return rtc_valid_tm(dt);
321	}
322
323	static int ds1343_set_time(struct device dev, struct rtc_time dt)
324	{
325	struct ds1343_priv *priv = dev_get_drvdata(dev);
326	int res;
327
328	res = regmap_write(priv->map, DS1343_SECONDS_REG,
329	bin2bcd(dt->tm_sec));
330	if (res)
331	return res;
332
333	res = regmap_write(priv->map, DS1343_MINUTES_REG,
334	bin2bcd(dt->tm_min));
335	if (res)
336	return res;
337
338	res = regmap_write(priv->map, DS1343_HOURS_REG,
339	bin2bcd(dt->tm_hour) & 0x3F);
340	if (res)
341	return res;
342
343	res = regmap_write(priv->map, DS1343_DAY_REG,
344	bin2bcd(dt->tm_wday + 1));
345	if (res)
346	return res;
347
348	res = regmap_write(priv->map, DS1343_DATE_REG,
349	bin2bcd(dt->tm_mday));
350	if (res)
351	return res;
352
353	res = regmap_write(priv->map, DS1343_MONTH_REG,
354	bin2bcd(dt->tm_mon + 1));
355	if (res)
356	return res;
357
358	dt->tm_year %= 100;
359
360	res = regmap_write(priv->map, DS1343_YEAR_REG,
361	bin2bcd(dt->tm_year));
362	if (res)
363	return res;
364
365	return 0;
366	}
367
368	static int ds1343_update_alarm(struct device *dev)
369	{
370	struct ds1343_priv *priv = dev_get_drvdata(dev);
371	unsigned int control, stat;
372	unsigned char buf[4];
373	int res = 0;
374
375	res = regmap_read(priv->map, DS1343_CONTROL_REG, &control);
376	if (res)
377	return res;
378
379	res = regmap_read(priv->map, DS1343_STATUS_REG, &stat);
380	if (res)
381	return res;
382
383	control &= ~(DS1343_A0IE);
384	stat &= ~(DS1343_IRQF0);
385
386	res = regmap_write(priv->map, DS1343_CONTROL_REG, control);
387	if (res)
388	return res;
389
390	res = regmap_write(priv->map, DS1343_STATUS_REG, stat);
391	if (res)
392	return res;
393
394	buf[0] = priv->alarm_sec < 0 \|\| (priv->irqen & RTC_UF) ?
395	0x80 : bin2bcd(priv->alarm_sec) & 0x7F;
396	buf[1] = priv->alarm_min < 0 \|\| (priv->irqen & RTC_UF) ?
397	0x80 : bin2bcd(priv->alarm_min) & 0x7F;
398	buf[2] = priv->alarm_hour < 0 \|\| (priv->irqen & RTC_UF) ?
399	0x80 : bin2bcd(priv->alarm_hour) & 0x3F;
400	buf[3] = priv->alarm_mday < 0 \|\| (priv->irqen & RTC_UF) ?
401	0x80 : bin2bcd(priv->alarm_mday) & 0x7F;
402
403	res = regmap_bulk_write(priv->map, DS1343_ALM0_SEC_REG, buf, 4);
404	if (res)
405	return res;
406
407	if (priv->irqen) {
408	control \|= DS1343_A0IE;
409	res = regmap_write(priv->map, DS1343_CONTROL_REG, control);
410	}
411
412	return res;
413	}
414
415	static int ds1343_read_alarm(struct device dev, struct rtc_wkalrm alarm)
416	{
417	struct ds1343_priv *priv = dev_get_drvdata(dev);
418	struct spi_device *spi = priv->spi;
419	int res = 0;
420	unsigned int stat;
421
422	if (spi->irq <= 0)
423	return -EINVAL;
424
425	mutex_lock(&priv->mutex);
426
427	res = regmap_read(priv->map, DS1343_STATUS_REG, &stat);
428	if (res)
429	goto out;
430
431	alarm->enabled = !!(priv->irqen & RTC_AF);
432	alarm->pending = !!(stat & DS1343_IRQF0);
433
434	alarm->time.tm_sec = priv->alarm_sec < 0 ? 0 : priv->alarm_sec;
435	alarm->time.tm_min = priv->alarm_min < 0 ? 0 : priv->alarm_min;
436	alarm->time.tm_hour = priv->alarm_hour < 0 ? 0 : priv->alarm_hour;
437	alarm->time.tm_mday = priv->alarm_mday < 0 ? 0 : priv->alarm_mday;
438
439	alarm->time.tm_mon = -1;
440	alarm->time.tm_year = -1;
441	alarm->time.tm_wday = -1;
442	alarm->time.tm_yday = -1;
443	alarm->time.tm_isdst = -1;
444
445	out:
446	mutex_unlock(&priv->mutex);
447	return res;
448	}
449
450	static int ds1343_set_alarm(struct device dev, struct rtc_wkalrm alarm)
451	{
452	struct ds1343_priv *priv = dev_get_drvdata(dev);
453	struct spi_device *spi = priv->spi;
454	int res = 0;
455
456	if (spi->irq <= 0)
457	return -EINVAL;
458
459	mutex_lock(&priv->mutex);
460
461	priv->alarm_sec = alarm->time.tm_sec;
462	priv->alarm_min = alarm->time.tm_min;
463	priv->alarm_hour = alarm->time.tm_hour;
464	priv->alarm_mday = alarm->time.tm_mday;
465
466	if (alarm->enabled)
467	priv->irqen \|= RTC_AF;
468
469	res = ds1343_update_alarm(dev);
470
471	mutex_unlock(&priv->mutex);
472
473	return res;
474	}
475
476	static int ds1343_alarm_irq_enable(struct device *dev, unsigned int enabled)
477	{
478	struct ds1343_priv *priv = dev_get_drvdata(dev);
479	struct spi_device *spi = priv->spi;
480	int res = 0;
481
482	if (spi->irq <= 0)
483	return -EINVAL;
484
485	mutex_lock(&priv->mutex);
486
487	if (enabled)
488	priv->irqen \|= RTC_AF;
489	else
490	priv->irqen &= ~RTC_AF;
491
492	res = ds1343_update_alarm(dev);
493
494	mutex_unlock(&priv->mutex);
495
496	return res;
497	}
498
499	static irqreturn_t ds1343_thread(int irq, void *dev_id)
500	{
501	struct ds1343_priv *priv = dev_id;
502	unsigned int stat, control;
503	int res = 0;
504
505	mutex_lock(&priv->mutex);
506
507	res = regmap_read(priv->map, DS1343_STATUS_REG, &stat);
508	if (res)
509	goto out;
510
511	if (stat & DS1343_IRQF0) {
512	stat &= ~DS1343_IRQF0;
513	regmap_write(priv->map, DS1343_STATUS_REG, stat);
514
515	res = regmap_read(priv->map, DS1343_CONTROL_REG, &control);
516	if (res)
517	goto out;
518
519	control &= ~DS1343_A0IE;
520	regmap_write(priv->map, DS1343_CONTROL_REG, control);
521
522	rtc_update_irq(priv->rtc, 1, RTC_AF \| RTC_IRQF);
523	}
524
525	out:
526	mutex_unlock(&priv->mutex);
527	return IRQ_HANDLED;
528	}
529
530	static const struct rtc_class_ops ds1343_rtc_ops = {
531	.ioctl = ds1343_ioctl,
532	.read_time = ds1343_read_time,
533	.set_time = ds1343_set_time,
534	.read_alarm = ds1343_read_alarm,
535	.set_alarm = ds1343_set_alarm,
536	.alarm_irq_enable = ds1343_alarm_irq_enable,
537	};
538
539	static int ds1343_probe(struct spi_device *spi)
540	{
541	struct ds1343_priv *priv;
542	struct regmap_config config;
543	unsigned int data;
544	int res;
545
546	memset(&config, 0, sizeof(config));
547	config.reg_bits = 8;
548	config.val_bits = 8;
549	config.write_flag_mask = 0x80;
550
551	priv = devm_kzalloc(&spi->dev, sizeof(struct ds1343_priv), GFP_KERNEL);
552	if (!priv)
553	return -ENOMEM;
554
555	priv->spi = spi;
556	mutex_init(&priv->mutex);
557
558	/* RTC DS1347 works in spi mode 3 and
559	* its chip select is active high
560	*/
561	spi->mode = SPI_MODE_3 \| SPI_CS_HIGH;
562	spi->bits_per_word = 8;
563	res = spi_setup(spi);
564	if (res)
565	return res;
566
567	spi_set_drvdata(spi, priv);
568
569	priv->map = devm_regmap_init_spi(spi, &config);
570
571	if (IS_ERR(priv->map)) {
572	dev_err(&spi->dev, "spi regmap init failed for rtc ds1343\n");
573	return PTR_ERR(priv->map);
574	}
575
576	res = regmap_read(priv->map, DS1343_SECONDS_REG, &data);
577	if (res)
578	return res;
579
580	regmap_read(priv->map, DS1343_CONTROL_REG, &data);
581	data \|= DS1343_INTCN;
582	data &= ~(DS1343_EOSC \| DS1343_A1IE \| DS1343_A0IE);
583	regmap_write(priv->map, DS1343_CONTROL_REG, data);
584
585	regmap_read(priv->map, DS1343_STATUS_REG, &data);
586	data &= ~(DS1343_OSF \| DS1343_IRQF1 \| DS1343_IRQF0);
587	regmap_write(priv->map, DS1343_STATUS_REG, data);
588
589	priv->rtc = devm_rtc_device_register(&spi->dev, "ds1343",
590	&ds1343_rtc_ops, THIS_MODULE);
591	if (IS_ERR(priv->rtc)) {
592	dev_err(&spi->dev, "unable to register rtc ds1343\n");
593	return PTR_ERR(priv->rtc);
594	}
595
596	if (spi->irq >= 0) {
597	res = devm_request_threaded_irq(&spi->dev, spi->irq, NULL,
598	ds1343_thread,
599	IRQF_NO_SUSPEND \| IRQF_ONESHOT,
600	"ds1343", priv);
601	if (res) {
602	dev_err(&spi->dev,
603	"unable to request irq for rtc ds1343\n");
604	return res;
605	}
606
607	device_set_wakeup_capable(&spi->dev, 1);
608	}
609
610	res = ds1343_sysfs_register(&spi->dev);
611	if (res)
612	dev_err(&spi->dev,
613	"unable to create sysfs entries for rtc ds1343\n");
614
615	return 0;
616	}
617
618	static int ds1343_remove(struct spi_device *spi)
619	{
620	struct ds1343_priv *priv = spi_get_drvdata(spi);
621
622	if (spi->irq) {
623	mutex_lock(&priv->mutex);
624	priv->irqen &= ~RTC_AF;
625	mutex_unlock(&priv->mutex);
626
627	devm_free_irq(&spi->dev, spi->irq, priv);
628	}
629
630	spi_set_drvdata(spi, NULL);
631
632	ds1343_sysfs_unregister(&spi->dev);
633
634	return 0;
635	}
636
637	#ifdef CONFIG_PM_SLEEP
638
639	static int ds1343_suspend(struct device *dev)
640	{
641	struct spi_device *spi = to_spi_device(dev);
642
643	if (spi->irq >= 0 && device_may_wakeup(dev))
644	enable_irq_wake(spi->irq);
645
646	return 0;
647	}
648
649	static int ds1343_resume(struct device *dev)
650	{
651	struct spi_device *spi = to_spi_device(dev);
652
653	if (spi->irq >= 0 && device_may_wakeup(dev))
654	disable_irq_wake(spi->irq);
655
656	return 0;
657	}
658
659	#endif
660
661	static SIMPLE_DEV_PM_OPS(ds1343_pm, ds1343_suspend, ds1343_resume);
662
663	static struct spi_driver ds1343_driver = {
664	.driver = {
665	.name = "ds1343",
666	.owner = THIS_MODULE,
667	.pm = &ds1343_pm,
668	},
669	.probe = ds1343_probe,
670	.remove = ds1343_remove,
671	.id_table = ds1343_id,
672	};
673
674	module_spi_driver(ds1343_driver);
675
676	MODULE_DESCRIPTION("DS1343 RTC SPI Driver");
677	MODULE_AUTHOR("Raghavendra Chandra Ganiga <ravi23ganiga@gmail.com>");
678	MODULE_LICENSE("GPL v2");
679	MODULE_VERSION(DS1343_DRV_VERSION);