[linux-2.6-block.git] / drivers / rtc / rtc-ds1343.c

// SPDX-License-Identifier: GPL-2.0-only
/* 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
 */

#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
d2912cb1	1	// SPDX-License-Identifier: GPL-2.0-only
1d6316f5 RG	2	/* rtc-ds1343.c
	3	*
	4	* Driver for Dallas Semiconductor DS1343 Low Current, SPI Compatible
	5	* Real Time Clock
	6	*
	7	* Author : Raghavendra Chandra Ganiga <ravi23ganiga@gmail.com>
571eb883	8	* Ankur Srivastava <sankurece@gmail.com> : DS1343 Nvram Support
1d6316f5 RG	9	*/
	10
	11	#include <linux/init.h>
	12	#include <linux/module.h>
	13	#include <linux/interrupt.h>
	14	#include <linux/device.h>
	15	#include <linux/spi/spi.h>
	16	#include <linux/regmap.h>
	17	#include <linux/rtc.h>
	18	#include <linux/bcd.h>
	19	#include <linux/pm.h>
caff0cc4	20	#include <linux/pm_wakeirq.h>
1d6316f5 RG	21	#include <linux/slab.h>
1d6316f5 RG	22
1d6316f5 RG	23	#define DALLAS_MAXIM_DS1343 0
	24	#define DALLAS_MAXIM_DS1344 1
	25
	26	/* RTC DS1343 Registers */
	27	#define DS1343_SECONDS_REG 0x00
	28	#define DS1343_MINUTES_REG 0x01
	29	#define DS1343_HOURS_REG 0x02
	30	#define DS1343_DAY_REG 0x03
	31	#define DS1343_DATE_REG 0x04
	32	#define DS1343_MONTH_REG 0x05
	33	#define DS1343_YEAR_REG 0x06
	34	#define DS1343_ALM0_SEC_REG 0x07
	35	#define DS1343_ALM0_MIN_REG 0x08
	36	#define DS1343_ALM0_HOUR_REG 0x09
	37	#define DS1343_ALM0_DAY_REG 0x0A
	38	#define DS1343_ALM1_SEC_REG 0x0B
	39	#define DS1343_ALM1_MIN_REG 0x0C
	40	#define DS1343_ALM1_HOUR_REG 0x0D
	41	#define DS1343_ALM1_DAY_REG 0x0E
	42	#define DS1343_CONTROL_REG 0x0F
	43	#define DS1343_STATUS_REG 0x10
	44	#define DS1343_TRICKLE_REG 0x11
571eb883 RG	45	#define DS1343_NVRAM 0x20
	46
	47	#define DS1343_NVRAM_LEN 96
1d6316f5 RG	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;
10b06b87	83	int irq;
1d6316f5 RG	84	int alarm_sec;
	85	int alarm_min;
	86	int alarm_hour;
	87	int alarm_mday;
	88	};
	89
	90	static int ds1343_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
	91	{
	92	switch (cmd) {
	93	#ifdef RTC_SET_CHARGE
	94	case RTC_SET_CHARGE:
	95	{
	96	int val;
	97
	98	if (copy_from_user(&val, (int __user *)arg, sizeof(int)))
	99	return -EFAULT;
	100
	101	return regmap_write(priv->map, DS1343_TRICKLE_REG, val);
	102	}
	103	break;
	104	#endif
	105	}
	106
	107	return -ENOIOCTLCMD;
	108	}
	109
	110	static ssize_t ds1343_show_glitchfilter(struct device *dev,
	111	struct device_attribute attr, char buf)
	112	{
	113	struct ds1343_priv *priv = dev_get_drvdata(dev);
	114	int glitch_filt_status, data;
	115
	116	regmap_read(priv->map, DS1343_CONTROL_REG, &data);
	117
	118	glitch_filt_status = !!(data & DS1343_EGFIL);
	119
	120	if (glitch_filt_status)
	121	return sprintf(buf, "enabled\n");
	122	else
	123	return sprintf(buf, "disabled\n");
	124	}
	125
	126	static ssize_t ds1343_store_glitchfilter(struct device *dev,
	127	struct device_attribute *attr,
	128	const char *buf, size_t count)
	129	{
	130	struct ds1343_priv *priv = dev_get_drvdata(dev);
	131	int data;
	132
	133	regmap_read(priv->map, DS1343_CONTROL_REG, &data);
	134
	135	if (strncmp(buf, "enabled", 7) == 0)
	136	data \|= DS1343_EGFIL;
	137
	138	else if (strncmp(buf, "disabled", 8) == 0)
	139	data &= ~(DS1343_EGFIL);
	140
	141	else
	142	return -EINVAL;
	143
	144	regmap_write(priv->map, DS1343_CONTROL_REG, data);
	145
	146	return count;
	147	}
148
149	static DEVICE_ATTR(glitch_filter, S_IRUGO \| S_IWUSR, ds1343_show_glitchfilter,
150	ds1343_store_glitchfilter);
151
d7501f70 AB	152	static int ds1343_nvram_write(void priv, unsigned int off, void val,
d7501f70 AB	153	size_t bytes)
571eb883	154	{
d7501f70	155	struct ds1343_priv *ds1343 = priv;
571eb883	156
d7501f70	157	return regmap_bulk_write(ds1343->map, DS1343_NVRAM + off, val, bytes);
571eb883 RG	158	}
571eb883 RG	159
d7501f70 AB	160	static int ds1343_nvram_read(void priv, unsigned int off, void val,
d7501f70 AB	161	size_t bytes)
571eb883	162	{
d7501f70	163	struct ds1343_priv *ds1343 = priv;
571eb883	164
d7501f70	165	return regmap_bulk_read(ds1343->map, DS1343_NVRAM + off, val, bytes);
571eb883 RG	166	}
571eb883 RG	167
1d6316f5 RG	168	static ssize_t ds1343_show_tricklecharger(struct device *dev,
	169	struct device_attribute attr, char buf)
	170	{
	171	struct ds1343_priv *priv = dev_get_drvdata(dev);
	172	int data;
	173	char diodes = "disabled", resistors = " ";
	174
	175	regmap_read(priv->map, DS1343_TRICKLE_REG, &data);
	176
	177	if ((data & 0xf0) == DS1343_TRICKLE_MAGIC) {
	178	switch (data & 0x0c) {
	179	case DS1343_TRICKLE_DS1:
	180	diodes = "one diode,";
	181	break;
	182
	183	default:
	184	diodes = "no diode,";
	185	break;
	186	}
	187
	188	switch (data & 0x03) {
	189	case DS1343_TRICKLE_1K:
	190	resistors = "1k Ohm";
	191	break;
	192
	193	case DS1343_TRICKLE_2K:
	194	resistors = "2k Ohm";
	195	break;
	196
	197	case DS1343_TRICKLE_4K:
	198	resistors = "4k Ohm";
	199	break;
	200
	201	default:
	202	diodes = "disabled";
	203	break;
	204	}
	205	}
	206
	207	return sprintf(buf, "%s %s\n", diodes, resistors);
	208	}
	209
	210	static DEVICE_ATTR(trickle_charger, S_IRUGO, ds1343_show_tricklecharger, NULL);
	211
	212	static int ds1343_sysfs_register(struct device *dev)
	213	{
	214	int err;
	215
	216	err = device_create_file(dev, &dev_attr_glitch_filter);
	217	if (err)
	218	return err;
	219
10b06b87	220	err = device_create_file(dev, &dev_attr_trickle_charger);
1d6316f5	221	if (!err)
ab392864	222	return 0;
1d6316f5	223
1d6316f5 RG	224	device_remove_file(dev, &dev_attr_glitch_filter);
	225
	226	return err;
	227	}
	228
	229	static void ds1343_sysfs_unregister(struct device *dev)
	230	{
	231	device_remove_file(dev, &dev_attr_glitch_filter);
10b06b87	232	device_remove_file(dev, &dev_attr_trickle_charger);
1d6316f5 RG	233	}
	234
	235	static int ds1343_read_time(struct device dev, struct rtc_time dt)
	236	{
	237	struct ds1343_priv *priv = dev_get_drvdata(dev);
	238	unsigned char buf[7];
	239	int res;
	240
	241	res = regmap_bulk_read(priv->map, DS1343_SECONDS_REG, buf, 7);
	242	if (res)
	243	return res;
	244
	245	dt->tm_sec = bcd2bin(buf[0]);
	246	dt->tm_min = bcd2bin(buf[1]);
	247	dt->tm_hour = bcd2bin(buf[2] & 0x3F);
	248	dt->tm_wday = bcd2bin(buf[3]) - 1;
	249	dt->tm_mday = bcd2bin(buf[4]);
	250	dt->tm_mon = bcd2bin(buf[5] & 0x1F) - 1;
	251	dt->tm_year = bcd2bin(buf[6]) + 100; /* year offset from 1900 */
	252
22652ba7	253	return 0;
1d6316f5 RG	254	}
	255
	256	static int ds1343_set_time(struct device dev, struct rtc_time dt)
	257	{
	258	struct ds1343_priv *priv = dev_get_drvdata(dev);
	259	int res;
	260
	261	res = regmap_write(priv->map, DS1343_SECONDS_REG,
	262	bin2bcd(dt->tm_sec));
	263	if (res)
	264	return res;
	265
	266	res = regmap_write(priv->map, DS1343_MINUTES_REG,
	267	bin2bcd(dt->tm_min));
	268	if (res)
	269	return res;
	270
	271	res = regmap_write(priv->map, DS1343_HOURS_REG,
	272	bin2bcd(dt->tm_hour) & 0x3F);
	273	if (res)
	274	return res;
	275
	276	res = regmap_write(priv->map, DS1343_DAY_REG,
	277	bin2bcd(dt->tm_wday + 1));
	278	if (res)
	279	return res;
	280
	281	res = regmap_write(priv->map, DS1343_DATE_REG,
	282	bin2bcd(dt->tm_mday));
	283	if (res)
	284	return res;
	285
	286	res = regmap_write(priv->map, DS1343_MONTH_REG,
	287	bin2bcd(dt->tm_mon + 1));
	288	if (res)
	289	return res;
	290
	291	dt->tm_year %= 100;
	292
	293	res = regmap_write(priv->map, DS1343_YEAR_REG,
	294	bin2bcd(dt->tm_year));
	295	if (res)
	296	return res;
	297
	298	return 0;
	299	}
	300
	301	static int ds1343_update_alarm(struct device *dev)
	302	{
	303	struct ds1343_priv *priv = dev_get_drvdata(dev);
	304	unsigned int control, stat;
	305	unsigned char buf[4];
	306	int res = 0;
	307
	308	res = regmap_read(priv->map, DS1343_CONTROL_REG, &control);
	309	if (res)
	310	return res;
	311
	312	res = regmap_read(priv->map, DS1343_STATUS_REG, &stat);
	313	if (res)
	314	return res;
	315
	316	control &= ~(DS1343_A0IE);
	317	stat &= ~(DS1343_IRQF0);
318
319	res = regmap_write(priv->map, DS1343_CONTROL_REG, control);
320	if (res)
321	return res;
322
323	res = regmap_write(priv->map, DS1343_STATUS_REG, stat);
324	if (res)
325	return res;
326
327	buf[0] = priv->alarm_sec < 0 \|\| (priv->irqen & RTC_UF) ?
328	0x80 : bin2bcd(priv->alarm_sec) & 0x7F;
329	buf[1] = priv->alarm_min < 0 \|\| (priv->irqen & RTC_UF) ?
330	0x80 : bin2bcd(priv->alarm_min) & 0x7F;
331	buf[2] = priv->alarm_hour < 0 \|\| (priv->irqen & RTC_UF) ?
332	0x80 : bin2bcd(priv->alarm_hour) & 0x3F;
333	buf[3] = priv->alarm_mday < 0 \|\| (priv->irqen & RTC_UF) ?
334	0x80 : bin2bcd(priv->alarm_mday) & 0x7F;
335
336	res = regmap_bulk_write(priv->map, DS1343_ALM0_SEC_REG, buf, 4);
337	if (res)
338	return res;
339
340	if (priv->irqen) {
341	control \|= DS1343_A0IE;
342	res = regmap_write(priv->map, DS1343_CONTROL_REG, control);
343	}
344
345	return res;
346	}
347
348	static int ds1343_read_alarm(struct device dev, struct rtc_wkalrm alarm)
349	{
350	struct ds1343_priv *priv = dev_get_drvdata(dev);
1d6316f5 RG	351	int res = 0;
	352	unsigned int stat;
	353
10b06b87	354	if (priv->irq <= 0)
1d6316f5 RG	355	return -EINVAL;
	356
	357	mutex_lock(&priv->mutex);
	358
	359	res = regmap_read(priv->map, DS1343_STATUS_REG, &stat);
	360	if (res)
	361	goto out;
	362
	363	alarm->enabled = !!(priv->irqen & RTC_AF);
	364	alarm->pending = !!(stat & DS1343_IRQF0);
	365
	366	alarm->time.tm_sec = priv->alarm_sec < 0 ? 0 : priv->alarm_sec;
	367	alarm->time.tm_min = priv->alarm_min < 0 ? 0 : priv->alarm_min;
	368	alarm->time.tm_hour = priv->alarm_hour < 0 ? 0 : priv->alarm_hour;
	369	alarm->time.tm_mday = priv->alarm_mday < 0 ? 0 : priv->alarm_mday;
	370
1d6316f5 RG	371	out:
	372	mutex_unlock(&priv->mutex);
	373	return res;
	374	}
	375
	376	static int ds1343_set_alarm(struct device dev, struct rtc_wkalrm alarm)
	377	{
	378	struct ds1343_priv *priv = dev_get_drvdata(dev);
1d6316f5 RG	379	int res = 0;
1d6316f5 RG	380
10b06b87	381	if (priv->irq <= 0)
1d6316f5 RG	382	return -EINVAL;
	383
	384	mutex_lock(&priv->mutex);
	385
	386	priv->alarm_sec = alarm->time.tm_sec;
	387	priv->alarm_min = alarm->time.tm_min;
	388	priv->alarm_hour = alarm->time.tm_hour;
	389	priv->alarm_mday = alarm->time.tm_mday;
	390
	391	if (alarm->enabled)
	392	priv->irqen \|= RTC_AF;
	393
	394	res = ds1343_update_alarm(dev);
	395
	396	mutex_unlock(&priv->mutex);
	397
	398	return res;
	399	}
	400
	401	static int ds1343_alarm_irq_enable(struct device *dev, unsigned int enabled)
	402	{
	403	struct ds1343_priv *priv = dev_get_drvdata(dev);
1d6316f5 RG	404	int res = 0;
1d6316f5 RG	405
10b06b87	406	if (priv->irq <= 0)
1d6316f5 RG	407	return -EINVAL;
	408
	409	mutex_lock(&priv->mutex);
	410
	411	if (enabled)
	412	priv->irqen \|= RTC_AF;
	413	else
	414	priv->irqen &= ~RTC_AF;
	415
	416	res = ds1343_update_alarm(dev);
	417
	418	mutex_unlock(&priv->mutex);
	419
	420	return res;
	421	}
	422
	423	static irqreturn_t ds1343_thread(int irq, void *dev_id)
	424	{
	425	struct ds1343_priv *priv = dev_id;
	426	unsigned int stat, control;
	427	int res = 0;
	428
	429	mutex_lock(&priv->mutex);
	430
	431	res = regmap_read(priv->map, DS1343_STATUS_REG, &stat);
	432	if (res)
	433	goto out;
	434
	435	if (stat & DS1343_IRQF0) {
	436	stat &= ~DS1343_IRQF0;
	437	regmap_write(priv->map, DS1343_STATUS_REG, stat);
	438
	439	res = regmap_read(priv->map, DS1343_CONTROL_REG, &control);
	440	if (res)
	441	goto out;
	442
	443	control &= ~DS1343_A0IE;
	444	regmap_write(priv->map, DS1343_CONTROL_REG, control);
	445
	446	rtc_update_irq(priv->rtc, 1, RTC_AF \| RTC_IRQF);
	447	}
	448
	449	out:
	450	mutex_unlock(&priv->mutex);
	451	return IRQ_HANDLED;
	452	}
	453
	454	static const struct rtc_class_ops ds1343_rtc_ops = {
	455	.ioctl = ds1343_ioctl,
	456	.read_time = ds1343_read_time,
	457	.set_time = ds1343_set_time,
	458	.read_alarm = ds1343_read_alarm,
	459	.set_alarm = ds1343_set_alarm,
	460	.alarm_irq_enable = ds1343_alarm_irq_enable,
	461	};
	462
	463	static int ds1343_probe(struct spi_device *spi)
	464	{
	465	struct ds1343_priv *priv;
b5086150 AB	466	struct regmap_config config = { .reg_bits = 8, .val_bits = 8,
b5086150 AB	467	.write_flag_mask = 0x80, };
1d6316f5 RG	468	unsigned int data;
1d6316f5 RG	469	int res;
d7501f70 AB	470	struct nvmem_config nvmem_cfg = {
	471	.name = "ds1343-",
	472	.word_size = 1,
	473	.stride = 1,
	474	.size = DS1343_NVRAM_LEN,
	475	.reg_read = ds1343_nvram_read,
	476	.reg_write = ds1343_nvram_write,
	477	};
1d6316f5	478
1d6316f5 RG	479	priv = devm_kzalloc(&spi->dev, sizeof(struct ds1343_priv), GFP_KERNEL);
	480	if (!priv)
	481	return -ENOMEM;
	482
	483	priv->spi = spi;
	484	mutex_init(&priv->mutex);
	485
	486	/* RTC DS1347 works in spi mode 3 and
	487	* its chip select is active high
	488	*/
	489	spi->mode = SPI_MODE_3 \| SPI_CS_HIGH;
	490	spi->bits_per_word = 8;
	491	res = spi_setup(spi);
	492	if (res)
	493	return res;
	494
	495	spi_set_drvdata(spi, priv);
	496
	497	priv->map = devm_regmap_init_spi(spi, &config);
	498
	499	if (IS_ERR(priv->map)) {
	500	dev_err(&spi->dev, "spi regmap init failed for rtc ds1343\n");
	501	return PTR_ERR(priv->map);
	502	}
	503
	504	res = regmap_read(priv->map, DS1343_SECONDS_REG, &data);
	505	if (res)
	506	return res;
	507
	508	regmap_read(priv->map, DS1343_CONTROL_REG, &data);
	509	data \|= DS1343_INTCN;
	510	data &= ~(DS1343_EOSC \| DS1343_A1IE \| DS1343_A0IE);
	511	regmap_write(priv->map, DS1343_CONTROL_REG, data);
	512
	513	regmap_read(priv->map, DS1343_STATUS_REG, &data);
	514	data &= ~(DS1343_OSF \| DS1343_IRQF1 \| DS1343_IRQF0);
	515	regmap_write(priv->map, DS1343_STATUS_REG, data);
	516
1536f6dc AB	517	priv->rtc = devm_rtc_allocate_device(&spi->dev);
1536f6dc AB	518	if (IS_ERR(priv->rtc))
1d6316f5	519	return PTR_ERR(priv->rtc);
1536f6dc	520
d7501f70	521	priv->rtc->nvram_old_abi = true;
1536f6dc AB	522	priv->rtc->ops = &ds1343_rtc_ops;
	523
	524	res = rtc_register_device(priv->rtc);
	525	if (res)
	526	return res;
1d6316f5	527
d7501f70 AB	528	nvmem_cfg.priv = priv;
	529	rtc_nvmem_register(priv->rtc, &nvmem_cfg);
	530
10b06b87 RG	531	priv->irq = spi->irq;
	532
	533	if (priv->irq >= 0) {
1d6316f5	534	res = devm_request_threaded_irq(&spi->dev, spi->irq, NULL,
caff0cc4	535	ds1343_thread, IRQF_ONESHOT,
1d6316f5 RG	536	"ds1343", priv);
1d6316f5 RG	537	if (res) {
10b06b87	538	priv->irq = -1;
1d6316f5 RG	539	dev_err(&spi->dev,
1d6316f5 RG	540	"unable to request irq for rtc ds1343\n");
10b06b87	541	} else {
caff0cc4 SH	542	device_init_wakeup(&spi->dev, true);
caff0cc4 SH	543	dev_pm_set_wake_irq(&spi->dev, spi->irq);
1d6316f5	544	}
1d6316f5 RG	545	}
	546
	547	res = ds1343_sysfs_register(&spi->dev);
	548	if (res)
	549	dev_err(&spi->dev,
	550	"unable to create sysfs entries for rtc ds1343\n");
	551
	552	return 0;
	553	}
	554
	555	static int ds1343_remove(struct spi_device *spi)
	556	{
	557	struct ds1343_priv *priv = spi_get_drvdata(spi);
	558
	559	if (spi->irq) {
	560	mutex_lock(&priv->mutex);
	561	priv->irqen &= ~RTC_AF;
	562	mutex_unlock(&priv->mutex);
	563
caff0cc4 SH	564	dev_pm_clear_wake_irq(&spi->dev);
caff0cc4 SH	565	device_init_wakeup(&spi->dev, false);
1d6316f5 RG	566	devm_free_irq(&spi->dev, spi->irq, priv);
	567	}
	568
	569	spi_set_drvdata(spi, NULL);
	570
	571	ds1343_sysfs_unregister(&spi->dev);
	572
	573	return 0;
	574	}
	575
	576	#ifdef CONFIG_PM_SLEEP
	577
	578	static int ds1343_suspend(struct device *dev)
	579	{
	580	struct spi_device *spi = to_spi_device(dev);
	581
	582	if (spi->irq >= 0 && device_may_wakeup(dev))
	583	enable_irq_wake(spi->irq);
	584
	585	return 0;
	586	}
	587
	588	static int ds1343_resume(struct device *dev)
	589	{
	590	struct spi_device *spi = to_spi_device(dev);
	591
	592	if (spi->irq >= 0 && device_may_wakeup(dev))
	593	disable_irq_wake(spi->irq);
	594
	595	return 0;
	596	}
	597
	598	#endif
	599
	600	static SIMPLE_DEV_PM_OPS(ds1343_pm, ds1343_suspend, ds1343_resume);
	601
	602	static struct spi_driver ds1343_driver = {
	603	.driver = {
	604	.name = "ds1343",
1d6316f5 RG	605	.pm = &ds1343_pm,
	606	},
	607	.probe = ds1343_probe,
	608	.remove = ds1343_remove,
	609	.id_table = ds1343_id,
	610	};
	611
	612	module_spi_driver(ds1343_driver);
	613
	614	MODULE_DESCRIPTION("DS1343 RTC SPI Driver");
571eb883 RG	615	MODULE_AUTHOR("Raghavendra Chandra Ganiga <ravi23ganiga@gmail.com>,"
571eb883 RG	616	"Ankur Srivastava <sankurece@gmail.com>");
1d6316f5	617	MODULE_LICENSE("GPL v2");