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drivers/rtc/rtc-ds1343.c: add support of nvram for maxim dallas rtc ds1343

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

Signed-off-by: Raghavendra Chandra Ganiga <ravi23ganiga@gmail.com>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Raghavendra Ganiga 2014-08-08 14:20:01 -07:00 committed by Linus Torvalds
parent 3b97dd0581
commit 571eb88390
1 changed files with 73 additions and 2 deletions
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75
drivers/rtc/rtc-ds1343.c
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@ -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);