[linux-block.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>
 *	    Ankur Srivastava <sankurece@gmail.com> : DS1343 Nvram Support
 *
 * 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/pm_wakeirq.h>
#include <linux/slab.h>

#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
#define DS1343_NVRAM		0x20

#define DS1343_NVRAM_LEN	96

/* 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 irq;
	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 int ds1343_nvram_write(void *priv, unsigned int off, void *val,
			      size_t bytes)
{
	struct ds1343_priv *ds1343 = priv;

	return regmap_bulk_write(ds1343->map, DS1343_NVRAM + off, val, bytes);
}

static int ds1343_nvram_read(void *priv, unsigned int off, void *val,
			     size_t bytes)
{
	struct ds1343_priv *ds1343 = priv;

	return regmap_bulk_read(ds1343->map, DS1343_NVRAM + off, val, bytes);
}

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_trickle_charger);
	if (!err)
		return 0;

	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_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 0;
}

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);
	int res = 0;
	unsigned int stat;

	if (priv->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;

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);
	int res = 0;

	if (priv->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);
	int res = 0;

	if (priv->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 = { .reg_bits = 8, .val_bits = 8,
					.write_flag_mask = 0x80, };
	unsigned int data;
	int res;
	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,
	};

	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_allocate_device(&spi->dev);
	if (IS_ERR(priv->rtc))
		return PTR_ERR(priv->rtc);

	priv->rtc->nvram_old_abi = true;
	priv->rtc->ops = &ds1343_rtc_ops;

	res = rtc_register_device(priv->rtc);
	if (res)
		return res;

	nvmem_cfg.priv = priv;
	rtc_nvmem_register(priv->rtc, &nvmem_cfg);

	priv->irq = spi->irq;

	if (priv->irq >= 0) {
		res = devm_request_threaded_irq(&spi->dev, spi->irq, NULL,
						ds1343_thread, IRQF_ONESHOT,
						"ds1343", priv);
		if (res) {
			priv->irq = -1;
			dev_err(&spi->dev,
				"unable to request irq for rtc ds1343\n");
		} else {
			device_init_wakeup(&spi->dev, true);
			dev_pm_set_wake_irq(&spi->dev, spi->irq);
		}
	}

	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);

		dev_pm_clear_wake_irq(&spi->dev);
		device_init_wakeup(&spi->dev, false);
		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",
		.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>,"
		"Ankur Srivastava <sankurece@gmail.com>");
MODULE_LICENSE("GPL v2");
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>
571eb883	7	* Ankur Srivastava <sankurece@gmail.com> : DS1343 Nvram Support
1d6316f5 RG	8	*
	9	* This program is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License version 2 as
	11	* published by the Free Software Foundation.
	12	*
	13	*/
	14
	15	#include <linux/init.h>
	16	#include <linux/module.h>
	17	#include <linux/interrupt.h>
	18	#include <linux/device.h>
	19	#include <linux/spi/spi.h>
	20	#include <linux/regmap.h>
	21	#include <linux/rtc.h>
	22	#include <linux/bcd.h>
	23	#include <linux/pm.h>
caff0cc4	24	#include <linux/pm_wakeirq.h>
1d6316f5 RG	25	#include <linux/slab.h>
1d6316f5 RG	26
1d6316f5 RG	27	#define DALLAS_MAXIM_DS1343 0
	28	#define DALLAS_MAXIM_DS1344 1
	29
	30	/* RTC DS1343 Registers */
	31	#define DS1343_SECONDS_REG 0x00
	32	#define DS1343_MINUTES_REG 0x01
	33	#define DS1343_HOURS_REG 0x02
	34	#define DS1343_DAY_REG 0x03
	35	#define DS1343_DATE_REG 0x04
	36	#define DS1343_MONTH_REG 0x05
	37	#define DS1343_YEAR_REG 0x06
	38	#define DS1343_ALM0_SEC_REG 0x07
	39	#define DS1343_ALM0_MIN_REG 0x08
	40	#define DS1343_ALM0_HOUR_REG 0x09
	41	#define DS1343_ALM0_DAY_REG 0x0A
	42	#define DS1343_ALM1_SEC_REG 0x0B
	43	#define DS1343_ALM1_MIN_REG 0x0C
	44	#define DS1343_ALM1_HOUR_REG 0x0D
	45	#define DS1343_ALM1_DAY_REG 0x0E
	46	#define DS1343_CONTROL_REG 0x0F
	47	#define DS1343_STATUS_REG 0x10
	48	#define DS1343_TRICKLE_REG 0x11
571eb883 RG	49	#define DS1343_NVRAM 0x20
	50
	51	#define DS1343_NVRAM_LEN 96
1d6316f5 RG	52
	53	/* DS1343 Control Registers bits */
	54	#define DS1343_EOSC 0x80
	55	#define DS1343_DOSF 0x20
	56	#define DS1343_EGFIL 0x10
	57	#define DS1343_SQW 0x08
	58	#define DS1343_INTCN 0x04
	59	#define DS1343_A1IE 0x02
	60	#define DS1343_A0IE 0x01
	61
	62	/* DS1343 Status Registers bits */
	63	#define DS1343_OSF 0x80
	64	#define DS1343_IRQF1 0x02
	65	#define DS1343_IRQF0 0x01
	66
	67	/* DS1343 Trickle Charger Registers bits */
	68	#define DS1343_TRICKLE_MAGIC 0xa0
	69	#define DS1343_TRICKLE_DS1 0x08
	70	#define DS1343_TRICKLE_1K 0x01
	71	#define DS1343_TRICKLE_2K 0x02
	72	#define DS1343_TRICKLE_4K 0x03
	73
	74	static const struct spi_device_id ds1343_id[] = {
	75	{ "ds1343", DALLAS_MAXIM_DS1343 },
	76	{ "ds1344", DALLAS_MAXIM_DS1344 },
	77	{ }
	78	};
	79	MODULE_DEVICE_TABLE(spi, ds1343_id);
	80
	81	struct ds1343_priv {
	82	struct spi_device *spi;
	83	struct rtc_device *rtc;
	84	struct regmap *map;
	85	struct mutex mutex;
	86	unsigned int irqen;
10b06b87	87	int irq;
1d6316f5 RG	88	int alarm_sec;
	89	int alarm_min;
	90	int alarm_hour;
	91	int alarm_mday;
	92	};
	93
	94	static int ds1343_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
	95	{
	96	switch (cmd) {
	97	#ifdef RTC_SET_CHARGE
	98	case RTC_SET_CHARGE:
	99	{
	100	int val;
	101
	102	if (copy_from_user(&val, (int __user *)arg, sizeof(int)))
	103	return -EFAULT;
	104
	105	return regmap_write(priv->map, DS1343_TRICKLE_REG, val);
	106	}
	107	break;
	108	#endif
	109	}
	110
	111	return -ENOIOCTLCMD;
	112	}
	113
	114	static ssize_t ds1343_show_glitchfilter(struct device *dev,
	115	struct device_attribute attr, char buf)
	116	{
	117	struct ds1343_priv *priv = dev_get_drvdata(dev);
	118	int glitch_filt_status, data;
	119
	120	regmap_read(priv->map, DS1343_CONTROL_REG, &data);
	121
	122	glitch_filt_status = !!(data & DS1343_EGFIL);
	123
	124	if (glitch_filt_status)
	125	return sprintf(buf, "enabled\n");
	126	else
	127	return sprintf(buf, "disabled\n");
	128	}
	129
	130	static ssize_t ds1343_store_glitchfilter(struct device *dev,
	131	struct device_attribute *attr,
	132	const char *buf, size_t count)
	133	{
	134	struct ds1343_priv *priv = dev_get_drvdata(dev);
	135	int data;
	136
	137	regmap_read(priv->map, DS1343_CONTROL_REG, &data);
	138
	139	if (strncmp(buf, "enabled", 7) == 0)
	140	data \|= DS1343_EGFIL;
	141
	142	else if (strncmp(buf, "disabled", 8) == 0)
	143	data &= ~(DS1343_EGFIL);
	144
	145	else
	146	return -EINVAL;
	147
	148	regmap_write(priv->map, DS1343_CONTROL_REG, data);
	149
	150	return count;
	151	}
152
153	static DEVICE_ATTR(glitch_filter, S_IRUGO \| S_IWUSR, ds1343_show_glitchfilter,
154	ds1343_store_glitchfilter);
155
d7501f70 AB	156	static int ds1343_nvram_write(void priv, unsigned int off, void val,
d7501f70 AB	157	size_t bytes)
571eb883	158	{
d7501f70	159	struct ds1343_priv *ds1343 = priv;
571eb883	160
d7501f70	161	return regmap_bulk_write(ds1343->map, DS1343_NVRAM + off, val, bytes);
571eb883 RG	162	}
571eb883 RG	163
d7501f70 AB	164	static int ds1343_nvram_read(void priv, unsigned int off, void val,
d7501f70 AB	165	size_t bytes)
571eb883	166	{
d7501f70	167	struct ds1343_priv *ds1343 = priv;
571eb883	168
d7501f70	169	return regmap_bulk_read(ds1343->map, DS1343_NVRAM + off, val, bytes);
571eb883 RG	170	}
571eb883 RG	171
1d6316f5 RG	172	static ssize_t ds1343_show_tricklecharger(struct device *dev,
	173	struct device_attribute attr, char buf)
	174	{
	175	struct ds1343_priv *priv = dev_get_drvdata(dev);
	176	int data;
	177	char diodes = "disabled", resistors = " ";
	178
	179	regmap_read(priv->map, DS1343_TRICKLE_REG, &data);
	180
	181	if ((data & 0xf0) == DS1343_TRICKLE_MAGIC) {
	182	switch (data & 0x0c) {
	183	case DS1343_TRICKLE_DS1:
	184	diodes = "one diode,";
	185	break;
	186
	187	default:
	188	diodes = "no diode,";
	189	break;
	190	}
	191
	192	switch (data & 0x03) {
	193	case DS1343_TRICKLE_1K:
	194	resistors = "1k Ohm";
	195	break;
	196
	197	case DS1343_TRICKLE_2K:
	198	resistors = "2k Ohm";
	199	break;
	200
	201	case DS1343_TRICKLE_4K:
	202	resistors = "4k Ohm";
	203	break;
	204
	205	default:
	206	diodes = "disabled";
	207	break;
	208	}
	209	}
	210
	211	return sprintf(buf, "%s %s\n", diodes, resistors);
	212	}
	213
	214	static DEVICE_ATTR(trickle_charger, S_IRUGO, ds1343_show_tricklecharger, NULL);
	215
	216	static int ds1343_sysfs_register(struct device *dev)
	217	{
	218	int err;
	219
	220	err = device_create_file(dev, &dev_attr_glitch_filter);
	221	if (err)
	222	return err;
	223
10b06b87	224	err = device_create_file(dev, &dev_attr_trickle_charger);
1d6316f5	225	if (!err)
ab392864	226	return 0;
1d6316f5	227
1d6316f5 RG	228	device_remove_file(dev, &dev_attr_glitch_filter);
	229
	230	return err;
	231	}
	232
	233	static void ds1343_sysfs_unregister(struct device *dev)
	234	{
	235	device_remove_file(dev, &dev_attr_glitch_filter);
10b06b87	236	device_remove_file(dev, &dev_attr_trickle_charger);
1d6316f5 RG	237	}
	238
	239	static int ds1343_read_time(struct device dev, struct rtc_time dt)
	240	{
	241	struct ds1343_priv *priv = dev_get_drvdata(dev);
	242	unsigned char buf[7];
	243	int res;
	244
	245	res = regmap_bulk_read(priv->map, DS1343_SECONDS_REG, buf, 7);
	246	if (res)
	247	return res;
	248
	249	dt->tm_sec = bcd2bin(buf[0]);
	250	dt->tm_min = bcd2bin(buf[1]);
	251	dt->tm_hour = bcd2bin(buf[2] & 0x3F);
	252	dt->tm_wday = bcd2bin(buf[3]) - 1;
	253	dt->tm_mday = bcd2bin(buf[4]);
	254	dt->tm_mon = bcd2bin(buf[5] & 0x1F) - 1;
	255	dt->tm_year = bcd2bin(buf[6]) + 100; /* year offset from 1900 */
	256
22652ba7	257	return 0;
1d6316f5 RG	258	}
	259
	260	static int ds1343_set_time(struct device dev, struct rtc_time dt)
	261	{
	262	struct ds1343_priv *priv = dev_get_drvdata(dev);
	263	int res;
	264
	265	res = regmap_write(priv->map, DS1343_SECONDS_REG,
	266	bin2bcd(dt->tm_sec));
	267	if (res)
	268	return res;
	269
	270	res = regmap_write(priv->map, DS1343_MINUTES_REG,
	271	bin2bcd(dt->tm_min));
	272	if (res)
	273	return res;
	274
	275	res = regmap_write(priv->map, DS1343_HOURS_REG,
	276	bin2bcd(dt->tm_hour) & 0x3F);
	277	if (res)
	278	return res;
	279
	280	res = regmap_write(priv->map, DS1343_DAY_REG,
	281	bin2bcd(dt->tm_wday + 1));
	282	if (res)
	283	return res;
	284
	285	res = regmap_write(priv->map, DS1343_DATE_REG,
	286	bin2bcd(dt->tm_mday));
	287	if (res)
	288	return res;
	289
	290	res = regmap_write(priv->map, DS1343_MONTH_REG,
	291	bin2bcd(dt->tm_mon + 1));
	292	if (res)
	293	return res;
	294
	295	dt->tm_year %= 100;
	296
	297	res = regmap_write(priv->map, DS1343_YEAR_REG,
	298	bin2bcd(dt->tm_year));
	299	if (res)
	300	return res;
	301
	302	return 0;
	303	}
	304
	305	static int ds1343_update_alarm(struct device *dev)
	306	{
	307	struct ds1343_priv *priv = dev_get_drvdata(dev);
	308	unsigned int control, stat;
	309	unsigned char buf[4];
	310	int res = 0;
	311
	312	res = regmap_read(priv->map, DS1343_CONTROL_REG, &control);
	313	if (res)
	314	return res;
	315
	316	res = regmap_read(priv->map, DS1343_STATUS_REG, &stat);
	317	if (res)
	318	return res;
	319
	320	control &= ~(DS1343_A0IE);
	321	stat &= ~(DS1343_IRQF0);
322
323	res = regmap_write(priv->map, DS1343_CONTROL_REG, control);
324	if (res)
325	return res;
326
327	res = regmap_write(priv->map, DS1343_STATUS_REG, stat);
328	if (res)
329	return res;
330
331	buf[0] = priv->alarm_sec < 0 \|\| (priv->irqen & RTC_UF) ?
332	0x80 : bin2bcd(priv->alarm_sec) & 0x7F;
333	buf[1] = priv->alarm_min < 0 \|\| (priv->irqen & RTC_UF) ?
334	0x80 : bin2bcd(priv->alarm_min) & 0x7F;
335	buf[2] = priv->alarm_hour < 0 \|\| (priv->irqen & RTC_UF) ?
336	0x80 : bin2bcd(priv->alarm_hour) & 0x3F;
337	buf[3] = priv->alarm_mday < 0 \|\| (priv->irqen & RTC_UF) ?
338	0x80 : bin2bcd(priv->alarm_mday) & 0x7F;
339
340	res = regmap_bulk_write(priv->map, DS1343_ALM0_SEC_REG, buf, 4);
341	if (res)
342	return res;
343
344	if (priv->irqen) {
345	control \|= DS1343_A0IE;
346	res = regmap_write(priv->map, DS1343_CONTROL_REG, control);
347	}
348
349	return res;
350	}
351
352	static int ds1343_read_alarm(struct device dev, struct rtc_wkalrm alarm)
353	{
354	struct ds1343_priv *priv = dev_get_drvdata(dev);
1d6316f5 RG	355	int res = 0;
	356	unsigned int stat;
	357
10b06b87	358	if (priv->irq <= 0)
1d6316f5 RG	359	return -EINVAL;
	360
	361	mutex_lock(&priv->mutex);
	362
	363	res = regmap_read(priv->map, DS1343_STATUS_REG, &stat);
	364	if (res)
	365	goto out;
	366
	367	alarm->enabled = !!(priv->irqen & RTC_AF);
	368	alarm->pending = !!(stat & DS1343_IRQF0);
	369
	370	alarm->time.tm_sec = priv->alarm_sec < 0 ? 0 : priv->alarm_sec;
	371	alarm->time.tm_min = priv->alarm_min < 0 ? 0 : priv->alarm_min;
	372	alarm->time.tm_hour = priv->alarm_hour < 0 ? 0 : priv->alarm_hour;
	373	alarm->time.tm_mday = priv->alarm_mday < 0 ? 0 : priv->alarm_mday;
	374
1d6316f5 RG	375	out:
	376	mutex_unlock(&priv->mutex);
	377	return res;
	378	}
	379
	380	static int ds1343_set_alarm(struct device dev, struct rtc_wkalrm alarm)
	381	{
	382	struct ds1343_priv *priv = dev_get_drvdata(dev);
1d6316f5 RG	383	int res = 0;
1d6316f5 RG	384
10b06b87	385	if (priv->irq <= 0)
1d6316f5 RG	386	return -EINVAL;
	387
	388	mutex_lock(&priv->mutex);
	389
	390	priv->alarm_sec = alarm->time.tm_sec;
	391	priv->alarm_min = alarm->time.tm_min;
	392	priv->alarm_hour = alarm->time.tm_hour;
	393	priv->alarm_mday = alarm->time.tm_mday;
	394
	395	if (alarm->enabled)
	396	priv->irqen \|= RTC_AF;
	397
	398	res = ds1343_update_alarm(dev);
	399
	400	mutex_unlock(&priv->mutex);
	401
	402	return res;
	403	}
	404
	405	static int ds1343_alarm_irq_enable(struct device *dev, unsigned int enabled)
	406	{
	407	struct ds1343_priv *priv = dev_get_drvdata(dev);
1d6316f5 RG	408	int res = 0;
1d6316f5 RG	409
10b06b87	410	if (priv->irq <= 0)
1d6316f5 RG	411	return -EINVAL;
	412
	413	mutex_lock(&priv->mutex);
	414
	415	if (enabled)
	416	priv->irqen \|= RTC_AF;
	417	else
	418	priv->irqen &= ~RTC_AF;
	419
	420	res = ds1343_update_alarm(dev);
	421
	422	mutex_unlock(&priv->mutex);
	423
	424	return res;
	425	}
	426
	427	static irqreturn_t ds1343_thread(int irq, void *dev_id)
	428	{
	429	struct ds1343_priv *priv = dev_id;
	430	unsigned int stat, control;
	431	int res = 0;
	432
	433	mutex_lock(&priv->mutex);
	434
	435	res = regmap_read(priv->map, DS1343_STATUS_REG, &stat);
	436	if (res)
	437	goto out;
	438
	439	if (stat & DS1343_IRQF0) {
	440	stat &= ~DS1343_IRQF0;
	441	regmap_write(priv->map, DS1343_STATUS_REG, stat);
	442
	443	res = regmap_read(priv->map, DS1343_CONTROL_REG, &control);
	444	if (res)
	445	goto out;
	446
	447	control &= ~DS1343_A0IE;
	448	regmap_write(priv->map, DS1343_CONTROL_REG, control);
	449
	450	rtc_update_irq(priv->rtc, 1, RTC_AF \| RTC_IRQF);
	451	}
	452
	453	out:
	454	mutex_unlock(&priv->mutex);
	455	return IRQ_HANDLED;
	456	}
	457
	458	static const struct rtc_class_ops ds1343_rtc_ops = {
	459	.ioctl = ds1343_ioctl,
	460	.read_time = ds1343_read_time,
	461	.set_time = ds1343_set_time,
	462	.read_alarm = ds1343_read_alarm,
	463	.set_alarm = ds1343_set_alarm,
	464	.alarm_irq_enable = ds1343_alarm_irq_enable,
	465	};
	466
	467	static int ds1343_probe(struct spi_device *spi)
	468	{
	469	struct ds1343_priv *priv;
b5086150 AB	470	struct regmap_config config = { .reg_bits = 8, .val_bits = 8,
b5086150 AB	471	.write_flag_mask = 0x80, };
1d6316f5 RG	472	unsigned int data;
1d6316f5 RG	473	int res;
d7501f70 AB	474	struct nvmem_config nvmem_cfg = {
	475	.name = "ds1343-",
	476	.word_size = 1,
	477	.stride = 1,
	478	.size = DS1343_NVRAM_LEN,
	479	.reg_read = ds1343_nvram_read,
	480	.reg_write = ds1343_nvram_write,
	481	};
1d6316f5	482
1d6316f5 RG	483	priv = devm_kzalloc(&spi->dev, sizeof(struct ds1343_priv), GFP_KERNEL);
	484	if (!priv)
	485	return -ENOMEM;
	486
	487	priv->spi = spi;
	488	mutex_init(&priv->mutex);
	489
	490	/* RTC DS1347 works in spi mode 3 and
	491	* its chip select is active high
	492	*/
	493	spi->mode = SPI_MODE_3 \| SPI_CS_HIGH;
	494	spi->bits_per_word = 8;
	495	res = spi_setup(spi);
	496	if (res)
	497	return res;
	498
	499	spi_set_drvdata(spi, priv);
	500
	501	priv->map = devm_regmap_init_spi(spi, &config);
	502
	503	if (IS_ERR(priv->map)) {
	504	dev_err(&spi->dev, "spi regmap init failed for rtc ds1343\n");
	505	return PTR_ERR(priv->map);
	506	}
	507
	508	res = regmap_read(priv->map, DS1343_SECONDS_REG, &data);
	509	if (res)
	510	return res;
	511
	512	regmap_read(priv->map, DS1343_CONTROL_REG, &data);
	513	data \|= DS1343_INTCN;
	514	data &= ~(DS1343_EOSC \| DS1343_A1IE \| DS1343_A0IE);
	515	regmap_write(priv->map, DS1343_CONTROL_REG, data);
	516
	517	regmap_read(priv->map, DS1343_STATUS_REG, &data);
	518	data &= ~(DS1343_OSF \| DS1343_IRQF1 \| DS1343_IRQF0);
	519	regmap_write(priv->map, DS1343_STATUS_REG, data);
	520
1536f6dc AB	521	priv->rtc = devm_rtc_allocate_device(&spi->dev);
1536f6dc AB	522	if (IS_ERR(priv->rtc))
1d6316f5	523	return PTR_ERR(priv->rtc);
1536f6dc	524
d7501f70	525	priv->rtc->nvram_old_abi = true;
1536f6dc AB	526	priv->rtc->ops = &ds1343_rtc_ops;
	527
	528	res = rtc_register_device(priv->rtc);
	529	if (res)
	530	return res;
1d6316f5	531
d7501f70 AB	532	nvmem_cfg.priv = priv;
	533	rtc_nvmem_register(priv->rtc, &nvmem_cfg);
	534
10b06b87 RG	535	priv->irq = spi->irq;
	536
	537	if (priv->irq >= 0) {
1d6316f5	538	res = devm_request_threaded_irq(&spi->dev, spi->irq, NULL,
caff0cc4	539	ds1343_thread, IRQF_ONESHOT,
1d6316f5 RG	540	"ds1343", priv);
1d6316f5 RG	541	if (res) {
10b06b87	542	priv->irq = -1;
1d6316f5 RG	543	dev_err(&spi->dev,
1d6316f5 RG	544	"unable to request irq for rtc ds1343\n");
10b06b87	545	} else {
caff0cc4 SH	546	device_init_wakeup(&spi->dev, true);
caff0cc4 SH	547	dev_pm_set_wake_irq(&spi->dev, spi->irq);
1d6316f5	548	}
1d6316f5 RG	549	}
	550
	551	res = ds1343_sysfs_register(&spi->dev);
	552	if (res)
	553	dev_err(&spi->dev,
	554	"unable to create sysfs entries for rtc ds1343\n");
	555
	556	return 0;
	557	}
	558
	559	static int ds1343_remove(struct spi_device *spi)
	560	{
	561	struct ds1343_priv *priv = spi_get_drvdata(spi);
	562
	563	if (spi->irq) {
	564	mutex_lock(&priv->mutex);
	565	priv->irqen &= ~RTC_AF;
	566	mutex_unlock(&priv->mutex);
	567
caff0cc4 SH	568	dev_pm_clear_wake_irq(&spi->dev);
caff0cc4 SH	569	device_init_wakeup(&spi->dev, false);
1d6316f5 RG	570	devm_free_irq(&spi->dev, spi->irq, priv);
	571	}
	572
	573	spi_set_drvdata(spi, NULL);
	574
	575	ds1343_sysfs_unregister(&spi->dev);
	576
	577	return 0;
	578	}
	579
	580	#ifdef CONFIG_PM_SLEEP
	581
	582	static int ds1343_suspend(struct device *dev)
	583	{
	584	struct spi_device *spi = to_spi_device(dev);
	585
	586	if (spi->irq >= 0 && device_may_wakeup(dev))
	587	enable_irq_wake(spi->irq);
	588
	589	return 0;
	590	}
	591
	592	static int ds1343_resume(struct device *dev)
	593	{
	594	struct spi_device *spi = to_spi_device(dev);
	595
	596	if (spi->irq >= 0 && device_may_wakeup(dev))
	597	disable_irq_wake(spi->irq);
	598
	599	return 0;
	600	}
	601
	602	#endif
	603
	604	static SIMPLE_DEV_PM_OPS(ds1343_pm, ds1343_suspend, ds1343_resume);
	605
	606	static struct spi_driver ds1343_driver = {
	607	.driver = {
	608	.name = "ds1343",
1d6316f5 RG	609	.pm = &ds1343_pm,
	610	},
	611	.probe = ds1343_probe,
	612	.remove = ds1343_remove,
	613	.id_table = ds1343_id,
	614	};
	615
	616	module_spi_driver(ds1343_driver);
	617
	618	MODULE_DESCRIPTION("DS1343 RTC SPI Driver");
571eb883 RG	619	MODULE_AUTHOR("Raghavendra Chandra Ganiga <ravi23ganiga@gmail.com>,"
571eb883 RG	620	"Ankur Srivastava <sankurece@gmail.com>");
1d6316f5	621	MODULE_LICENSE("GPL v2");