diff options
author | Alexandre Belloni <alexandre.belloni@bootlin.com> | 2018-02-13 01:47:43 +0300 |
---|---|---|
committer | Alexandre Belloni <alexandre.belloni@bootlin.com> | 2018-03-01 12:49:28 +0300 |
commit | 3a9a06d44bf75a1e0752e2de686729fb2a85ad22 (patch) | |
tree | 22566576b33535200580584c9fb7e6e48c863cdb /drivers/rtc | |
parent | 18c88cc9b0483c78562a0192779ec4d7ddc5dcf5 (diff) | |
download | linux-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.c | 55 |
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; |