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rtc: ds1685: use generic nvmem 

Instead of adding a binary sysfs attribute from the driver, use the core to
register an nvmem device.

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
hifive-unleashed-5.1
Alexandre Belloni 2018-09-19 19:52:10 +02:00
parent 8ddeb09de1
commit 482419e120
1 changed files with 25 additions and 67 deletions
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92
drivers/rtc/rtc-ds1685.c
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@ -866,30 +866,13 @@ ds1685_rtc_ops = {
};
/* ----------------------------------------------------------------------- */
/* ----------------------------------------------------------------------- */
/* SysFS interface */
#ifdef CONFIG_SYSFS
/**
* ds1685_rtc_sysfs_nvram_read - reads rtc nvram via sysfs.
* @file: pointer to file structure.
* @kobj: pointer to kobject structure.
* @bin_attr: pointer to bin_attribute structure.
* @buf: pointer to char array to hold the output.
* @pos: current file position pointer.
* @size: size of the data to read.
*/
static ssize_t
ds1685_rtc_sysfs_nvram_read(struct file *filp, struct kobject *kobj,
struct bin_attribute *bin_attr, char *buf,
loff_t pos, size_t size)
static int ds1685_nvram_read(void *priv, unsigned int pos, void *val,
size_t size)
{
struct platform_device *pdev =
to_platform_device(container_of(kobj, struct device, kobj));
struct ds1685_priv *rtc = platform_get_drvdata(pdev);
struct ds1685_priv *rtc = priv;
ssize_t count;
unsigned long flags = 0;
u8 *buf = val;
spin_lock_irqsave(&rtc->lock, flags);
ds1685_rtc_switch_to_bank0(rtc);
@ -943,33 +926,16 @@ ds1685_rtc_sysfs_nvram_read(struct file *filp, struct kobject *kobj,
#endif /* !CONFIG_RTC_DRV_DS1689 */
spin_unlock_irqrestore(&rtc->lock, flags);
/*
* XXX: Bug? this appears to cause the function to get executed
* several times in succession. But it's the only way to actually get
* data written out to a file.
*/
return count;
return 0;
}
/**
* ds1685_rtc_sysfs_nvram_write - writes rtc nvram via sysfs.
* @file: pointer to file structure.
* @kobj: pointer to kobject structure.
* @bin_attr: pointer to bin_attribute structure.
* @buf: pointer to char array to hold the input.
* @pos: current file position pointer.
* @size: size of the data to write.
*/
static ssize_t
ds1685_rtc_sysfs_nvram_write(struct file *filp, struct kobject *kobj,
struct bin_attribute *bin_attr, char *buf,
loff_t pos, size_t size)
static int ds1685_nvram_write(void *priv, unsigned int pos, void *val,
size_t size)
{
struct platform_device *pdev =
to_platform_device(container_of(kobj, struct device, kobj));
struct ds1685_priv *rtc = platform_get_drvdata(pdev);
struct ds1685_priv *rtc = priv;
ssize_t count;
unsigned long flags = 0;
u8 *buf = val;
spin_lock_irqsave(&rtc->lock, flags);
ds1685_rtc_switch_to_bank0(rtc);
@ -1023,27 +989,13 @@ ds1685_rtc_sysfs_nvram_write(struct file *filp, struct kobject *kobj,
#endif /* !CONFIG_RTC_DRV_DS1689 */
spin_unlock_irqrestore(&rtc->lock, flags);
return count;
return 0;
}
/**
* struct ds1685_rtc_sysfs_nvram_attr - sysfs attributes for rtc nvram.
* @attr: nvram attributes.
* @read: nvram read function.
* @write: nvram write function.
* @size: nvram total size (bank0 + extended).
*/
static struct bin_attribute
ds1685_rtc_sysfs_nvram_attr = {
.attr = {
.name = "nvram",
.mode = S_IRUGO | S_IWUSR,
},
.read = ds1685_rtc_sysfs_nvram_read,
.write = ds1685_rtc_sysfs_nvram_write,
.size = NVRAM_TOTAL_SZ
};
/* ----------------------------------------------------------------------- */
/* SysFS interface */
#ifdef CONFIG_SYSFS
/**
* ds1685_rtc_sysfs_battery_show - sysfs file for main battery status.
* @dev: pointer to device structure.
@ -1136,11 +1088,6 @@ ds1685_rtc_sysfs_register(struct device *dev)
{
int ret = 0;
sysfs_bin_attr_init(&ds1685_rtc_sysfs_nvram_attr);
ret = sysfs_create_bin_file(&dev->kobj, &ds1685_rtc_sysfs_nvram_attr);
if (ret)
return ret;
ret = sysfs_create_group(&dev->kobj, &ds1685_rtc_sysfs_misc_grp);
if (ret)
return ret;
@ -1155,7 +1102,6 @@ ds1685_rtc_sysfs_register(struct device *dev)
static int
ds1685_rtc_sysfs_unregister(struct device *dev)
{
sysfs_remove_bin_file(&dev->kobj, &ds1685_rtc_sysfs_nvram_attr);
sysfs_remove_group(&dev->kobj, &ds1685_rtc_sysfs_misc_grp);
return 0;
@ -1181,6 +1127,12 @@ ds1685_rtc_probe(struct platform_device *pdev)
u8 ctrla, ctrlb, hours;
unsigned char am_pm;
int ret = 0;
struct nvmem_config nvmem_cfg = {
.name = "ds1685_nvram",
.size = NVRAM_TOTAL_SZ,
.reg_read = ds1685_nvram_read,
.reg_write = ds1685_nvram_write,
};
/* Get the platform data. */
pdata = (struct ds1685_rtc_platform_data *) pdev->dev.platform_data;
@ -1444,6 +1396,12 @@ ds1685_rtc_probe(struct platform_device *pdev)
return ret;
#endif
rtc_dev->nvram_old_abi = true;
nvmem_cfg.priv = rtc;
ret = rtc_nvmem_register(rtc_dev, &nvmem_cfg);
if (ret)
return ret;
return rtc_register_device(rtc_dev);
}