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rtc: rv8803: use generic nvmem support 

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 2017-07-06 11:42:04 +02:00
parent 7133eca195
commit 16d70a78b4
1 changed files with 20 additions and 31 deletions
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51
drivers/rtc/rtc-rv8803.c
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@ -68,6 +68,7 @@ struct rv8803_data {
struct mutex flags_lock;
u8 ctrl;
enum rv8803_type type;
struct nvmem_config nvmem_cfg;
};
static int rv8803_read_reg(const struct i2c_client *client, u8 reg)
@ -460,48 +461,32 @@ static int rv8803_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
}
}
static ssize_t rv8803_nvram_write(struct file *filp, struct kobject *kobj,
struct bin_attribute *attr,
char *buf, loff_t off, size_t count)
static int rv8803_nvram_write(void *priv, unsigned int offset, void *val,
size_t bytes)
{
struct device *dev = kobj_to_dev(kobj);
struct i2c_client *client = to_i2c_client(dev);
int ret;
ret = rv8803_write_reg(client, RV8803_RAM, buf[0]);
ret = rv8803_write_reg(priv, RV8803_RAM, *(u8 *)val);
if (ret)
return ret;
return 1;
return 0;
}
static ssize_t rv8803_nvram_read(struct file *filp, struct kobject *kobj,
struct bin_attribute *attr,
char *buf, loff_t off, size_t count)
static int rv8803_nvram_read(void *priv, unsigned int offset,
void *val, size_t bytes)
{
struct device *dev = kobj_to_dev(kobj);
struct i2c_client *client = to_i2c_client(dev);
int ret;
ret = rv8803_read_reg(client, RV8803_RAM);
ret = rv8803_read_reg(priv, RV8803_RAM);
if (ret < 0)
return ret;
buf[0] = ret;
*(u8 *)val = ret;
return 1;
return 0;
}
static struct bin_attribute rv8803_nvram_attr = {
.attr = {
.name = "nvram",
.mode = S_IRUGO | S_IWUSR,
},
.size = 1,
.read = rv8803_nvram_read,
.write = rv8803_nvram_write,
};
static struct rtc_class_ops rv8803_rtc_ops = {
.read_time = rv8803_get_time,
.set_time = rv8803_set_time,
@ -597,7 +582,17 @@ static int rv8803_probe(struct i2c_client *client,
}
}
rv8803->nvmem_cfg.name = "rv8803_nvram",
rv8803->nvmem_cfg.word_size = 1,
rv8803->nvmem_cfg.stride = 1,
rv8803->nvmem_cfg.size = 1,
rv8803->nvmem_cfg.reg_read = rv8803_nvram_read,
rv8803->nvmem_cfg.reg_write = rv8803_nvram_write,
rv8803->nvmem_cfg.priv = client;
rv8803->rtc->ops = &rv8803_rtc_ops;
rv8803->rtc->nvmem_config = &rv8803->nvmem_cfg;
rv8803->rtc->nvram_old_abi = true;
err = rtc_register_device(rv8803->rtc);
if (err)
return err;
@ -612,10 +607,6 @@ static int rv8803_probe(struct i2c_client *client,
return err;
}
err = device_create_bin_file(&client->dev, &rv8803_nvram_attr);
if (err)
return err;
rv8803->rtc->max_user_freq = 1;
return 0;
@ -623,8 +614,6 @@ static int rv8803_probe(struct i2c_client *client,
static int rv8803_remove(struct i2c_client *client)
{
device_remove_bin_file(&client->dev, &rv8803_nvram_attr);
return 0;
}