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Commit 571eb883 authored by Raghavendra Ganiga's avatar Raghavendra Ganiga Committed by Linus Torvalds
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drivers/rtc/rtc-ds1343.c: add support of nvram for maxim dallas rtc ds1343 



This is a patch to add support of nvram for maxim dallas rtc ds1343.

Signed-off-by: default avatarRaghavendra Chandra Ganiga <ravi23ganiga@gmail.com>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 3b97dd05

drivers/rtc/rtc-ds1343.c

+73 −2
Original line number Diff line number Diff line
@@ -4,6 +4,7 @@ 
 * 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
@@ -45,6 +46,9 @@ 
#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
@@ -149,6 +153,64 @@ static ssize_t ds1343_store_glitchfilter(struct device *dev, 
static DEVICE_ATTR(glitch_filter, S_IRUGO | S_IWUSR, ds1343_show_glitchfilter,

			ds1343_store_glitchfilter);



static ssize_t ds1343_nvram_write(struct file *filp, struct kobject *kobj,

			struct bin_attribute *attr,

			char *buf, loff_t off, size_t count)

{

	int ret;

	unsigned char address;

	struct device *dev = kobj_to_dev(kobj);

	struct ds1343_priv *priv = dev_get_drvdata(dev);



	if (unlikely(!count))

		return count;



	if ((count + off) > DS1343_NVRAM_LEN)

		count = DS1343_NVRAM_LEN - off;



	address = DS1343_NVRAM + off;



	ret = regmap_bulk_write(priv->map, address, buf, count);

	if (ret < 0)

		dev_err(&priv->spi->dev, "Error in nvram write %d", ret);



	return (ret < 0) ? ret : count;

}





static ssize_t ds1343_nvram_read(struct file *filp, struct kobject *kobj,

				struct bin_attribute *attr,

				char *buf, loff_t off, size_t count)

{

	int ret;

	unsigned char address;

	struct device *dev = kobj_to_dev(kobj);

	struct ds1343_priv *priv = dev_get_drvdata(dev);



	if (unlikely(!count))

		return count;



	if ((count + off) > DS1343_NVRAM_LEN)

		count = DS1343_NVRAM_LEN - off;



	address = DS1343_NVRAM + off;



	ret = regmap_bulk_read(priv->map, address, buf, count);

	if (ret < 0)

		dev_err(&priv->spi->dev, "Error in nvram read %d\n", ret);



	return (ret < 0) ? ret : count;

}





static struct bin_attribute nvram_attr = {

	.attr.name	= "nvram",

	.attr.mode	= S_IRUGO | S_IWUSR,

	.read		= ds1343_nvram_read,

	.write		= ds1343_nvram_write,

	.size		= DS1343_NVRAM_LEN,

};



static ssize_t ds1343_show_alarmstatus(struct device *dev,

				struct device_attribute *attr, char *buf)

{
@@ -274,12 +336,16 @@ static int ds1343_sysfs_register(struct device *dev) 
	if (err)

		goto error1;



	err = device_create_bin_file(dev, &nvram_attr);

	if (err)

		goto error2;



	if (priv->irq <= 0)

		return err;



	err = device_create_file(dev, &dev_attr_alarm_mode);

	if (err)

		goto error2;

		goto error3;



	err = device_create_file(dev, &dev_attr_alarm_status);

	if (!err)
@@ -287,6 +353,9 @@ static int ds1343_sysfs_register(struct device *dev) 


	device_remove_file(dev, &dev_attr_alarm_mode);



error3:

	device_remove_bin_file(dev, &nvram_attr);



error2:

	device_remove_file(dev, &dev_attr_trickle_charger);
@@ -302,6 +371,7 @@ static void ds1343_sysfs_unregister(struct device *dev) 


	device_remove_file(dev, &dev_attr_glitch_filter);

	device_remove_file(dev, &dev_attr_trickle_charger);

	device_remove_bin_file(dev, &nvram_attr);



	if (priv->irq <= 0)

		return;
@@ -684,6 +754,7 @@ static struct spi_driver ds1343_driver = { 
module_spi_driver(ds1343_driver);



MODULE_DESCRIPTION("DS1343 RTC SPI Driver");

MODULE_AUTHOR("Raghavendra Chandra Ganiga <ravi23ganiga@gmail.com>");

MODULE_AUTHOR("Raghavendra Chandra Ganiga <ravi23ganiga@gmail.com>,"

		"Ankur Srivastava <sankurece@gmail.com>");

MODULE_LICENSE("GPL v2");

MODULE_VERSION(DS1343_DRV_VERSION);