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authorAlexandre Belloni <alexandre.belloni@bootlin.com>2018-02-13 01:47:43 +0300
committerAlexandre Belloni <alexandre.belloni@bootlin.com>2018-03-01 12:49:28 +0300
commit3a9a06d44bf75a1e0752e2de686729fb2a85ad22 (patch)
tree22566576b33535200580584c9fb7e6e48c863cdb /drivers/rtc
parent18c88cc9b0483c78562a0192779ec4d7ddc5dcf5 (diff)
downloadlinux-3a9a06d44bf75a1e0752e2de686729fb2a85ad22.tar.xz
rtc: ds1553: 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@bootlin.com>
Diffstat (limited to 'drivers/rtc')
-rw-r--r--drivers/rtc/rtc-ds1553.c55
1 files changed, 24 insertions, 31 deletions
diff --git a/drivers/rtc/rtc-ds1553.c b/drivers/rtc/rtc-ds1553.c
index 59eab5eceafa..6205c28e0cdc 100644
--- a/drivers/rtc/rtc-ds1553.c
+++ b/drivers/rtc/rtc-ds1553.c
@@ -233,46 +233,32 @@ static const struct rtc_class_ops ds1553_rtc_ops = {
.alarm_irq_enable = ds1553_rtc_alarm_irq_enable,
};
-static ssize_t ds1553_nvram_read(struct file *filp, struct kobject *kobj,
- struct bin_attribute *bin_attr,
- char *buf, loff_t pos, size_t size)
+static int ds1553_nvram_read(void *priv, unsigned int pos, void *val,
+ size_t bytes)
{
- struct device *dev = container_of(kobj, struct device, kobj);
- struct platform_device *pdev = to_platform_device(dev);
+ struct platform_device *pdev = priv;
struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
void __iomem *ioaddr = pdata->ioaddr;
- ssize_t count;
+ u8 *buf = val;
- for (count = 0; count < size; count++)
+ for (; bytes; bytes--)
*buf++ = readb(ioaddr + pos++);
- return count;
+ return 0;
}
-static ssize_t ds1553_nvram_write(struct file *filp, struct kobject *kobj,
- struct bin_attribute *bin_attr,
- char *buf, loff_t pos, size_t size)
+static int ds1553_nvram_write(void *priv, unsigned int pos, void *val,
+ size_t bytes)
{
- struct device *dev = container_of(kobj, struct device, kobj);
- struct platform_device *pdev = to_platform_device(dev);
+ struct platform_device *pdev = priv;
struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
void __iomem *ioaddr = pdata->ioaddr;
- ssize_t count;
+ u8 *buf = val;
- for (count = 0; count < size; count++)
+ for (; bytes; bytes--)
writeb(*buf++, ioaddr + pos++);
- return count;
+ return 0;
}
-static struct bin_attribute ds1553_nvram_attr = {
- .attr = {
- .name = "nvram",
- .mode = S_IRUGO | S_IWUSR,
- },
- .size = RTC_OFFSET,
- .read = ds1553_nvram_read,
- .write = ds1553_nvram_write,
-};
-
static int ds1553_rtc_probe(struct platform_device *pdev)
{
struct resource *res;
@@ -280,6 +266,15 @@ static int ds1553_rtc_probe(struct platform_device *pdev)
struct rtc_plat_data *pdata;
void __iomem *ioaddr;
int ret = 0;
+ struct nvmem_config nvmem_cfg = {
+ .name = "ds1553_nvram",
+ .word_size = 1,
+ .stride = 1,
+ .size = RTC_OFFSET,
+ .reg_read = ds1553_nvram_read,
+ .reg_write = ds1553_nvram_write,
+ .priv = pdev,
+ };
pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata)
@@ -313,6 +308,7 @@ static int ds1553_rtc_probe(struct platform_device *pdev)
return PTR_ERR(pdata->rtc);
pdata->rtc->ops = &ds1553_rtc_ops;
+ pdata->rtc->nvram_old_abi = true;
ret = rtc_register_device(pdata->rtc);
if (ret)
@@ -328,10 +324,8 @@ static int ds1553_rtc_probe(struct platform_device *pdev)
}
}
- ret = sysfs_create_bin_file(&pdev->dev.kobj, &ds1553_nvram_attr);
- if (ret)
- dev_err(&pdev->dev, "unable to create sysfs file: %s\n",
- ds1553_nvram_attr.attr.name);
+ if (rtc_nvmem_register(pdata->rtc, &nvmem_cfg))
+ dev_err(&pdev->dev, "unable to register nvmem\n");
return 0;
}
@@ -340,7 +334,6 @@ static int ds1553_rtc_remove(struct platform_device *pdev)
{
struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
- sysfs_remove_bin_file(&pdev->dev.kobj, &ds1553_nvram_attr);
if (pdata->irq > 0)
writeb(0, pdata->ioaddr + RTC_INTERRUPTS);
return 0;