diff options
Diffstat (limited to 'drivers/rtc/rtc-ds1343.c')
| -rw-r--r-- | drivers/rtc/rtc-ds1343.c | 75 |
1 files changed, 73 insertions, 2 deletions
diff --git a/drivers/rtc/rtc-ds1343.c b/drivers/rtc/rtc-ds1343.c index c3719189dd96..ae9f997223b1 100644 --- a/drivers/rtc/rtc-ds1343.c +++ b/drivers/rtc/rtc-ds1343.c @@ -4,6 +4,7 @@ * Real Time Clock * * Author : Raghavendra Chandra Ganiga <[email protected]> + * Ankur Srivastava <[email protected]> : 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 <[email protected]>"); +MODULE_AUTHOR("Raghavendra Chandra Ganiga <[email protected]>," + "Ankur Srivastava <[email protected]>"); MODULE_LICENSE("GPL v2"); MODULE_VERSION(DS1343_DRV_VERSION); |