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rtc: ds1511: use generic nvmem 

Instead of adding a binary sysfs attribute from the driver (which suffers
from a race condition as the attribute appears after the device), use the
core to register an nvmem device.

Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
hifive-unleashed-5.1
Alexandre Belloni 2017-10-13 00:05:29 +02:00
parent a283d27625
commit 9d7ed21ff4
1 changed files with 22 additions and 36 deletions
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58
drivers/rtc/rtc-ds1511.c
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@ -398,42 +398,37 @@ static const struct rtc_class_ops ds1511_rtc_ops = {
.alarm_irq_enable = ds1511_rtc_alarm_irq_enable,
};
static ssize_t
ds1511_nvram_read(struct file *filp, struct kobject *kobj,
struct bin_attribute *ba,
char *buf, loff_t pos, size_t size)
static int ds1511_nvram_read(void *priv, unsigned int pos, void *buf,
size_t size)
{
ssize_t count;
int i;
rtc_write(pos, DS1511_RAMADDR_LSB);
for (count = 0; count < size; count++)
*buf++ = rtc_read(DS1511_RAMDATA);
for (i = 0; i < size; i++)
*(char *)buf++ = rtc_read(DS1511_RAMDATA);
return count;
return 0;
}
static ssize_t
ds1511_nvram_write(struct file *filp, struct kobject *kobj,
struct bin_attribute *bin_attr,
char *buf, loff_t pos, size_t size)
static int ds1511_nvram_write(void *priv, unsigned int pos, void *buf,
size_t size)
{
ssize_t count;
int i;
rtc_write(pos, DS1511_RAMADDR_LSB);
for (count = 0; count < size; count++)
rtc_write(*buf++, DS1511_RAMDATA);
for (i = 0; i < size; i++)
rtc_write(*(char *)buf++, DS1511_RAMDATA);
return count;
return 0;
}
static struct bin_attribute ds1511_nvram_attr = {
.attr = {
.name = "nvram",
.mode = S_IRUGO | S_IWUSR,
},
static struct nvmem_config ds1511_nvmem_cfg = {
.name = "ds1511_nvram",
.word_size = 1,
.stride = 1,
.size = DS1511_RAM_MAX,
.read = ds1511_nvram_read,
.write = ds1511_nvram_write,
.reg_read = ds1511_nvram_read,
.reg_write = ds1511_nvram_write,
};
static int ds1511_rtc_probe(struct platform_device *pdev)
@ -483,6 +478,10 @@ static int ds1511_rtc_probe(struct platform_device *pdev)
pdata->rtc->ops = &ds1511_rtc_ops;
ds1511_nvmem_cfg.priv = &pdev->dev;
pdata->rtc->nvmem_config = &ds1511_nvmem_cfg;
pdata->rtc->nvram_old_abi = true;
ret = rtc_register_device(pdata->rtc);
if (ret)
return ret;
@ -501,18 +500,6 @@ static int ds1511_rtc_probe(struct platform_device *pdev)
}
}
ret = sysfs_create_bin_file(&pdev->dev.kobj, &ds1511_nvram_attr);
if (ret)
dev_err(&pdev->dev, "Unable to create sysfs entry: %s\n",
ds1511_nvram_attr.attr.name);
return 0;
}
static int ds1511_rtc_remove(struct platform_device *pdev)
{
sysfs_remove_bin_file(&pdev->dev.kobj, &ds1511_nvram_attr);
return 0;
}
@ -521,7 +508,6 @@ MODULE_ALIAS("platform:ds1511");
static struct platform_driver ds1511_rtc_driver = {
.probe = ds1511_rtc_probe,
.remove = ds1511_rtc_remove,
.driver = {
.name = "ds1511",
},