static int rx8025_get_datetime(struct i2c_client *client, struct rtc_time *tm)
{
unsigned char date[7];
int data, err;
//init rx8025
i2c_smbus_write_byte_data(client, RX8025_REG_CTRL1,0x20);
i2c_smbus_write_byte_data(client, RX8025_REG_CTRL2,0x20);
/* Now read time and date */
data = i2c_smbus_read_byte_data(client, RX8025_REG_SC) & 0x7f;
if (data < 0) {
dev_err(&client->dev, "Unable to read second\n");
return -EIO;
}
tm->tm_sec = bcd2bin(data);
data = i2c_smbus_read_byte_data(client, RX8025_REG_MN) & 0x7f;
if (data < 0) {
dev_err(&client->dev, "Unable to read min\n");
return -EIO;
}
tm->tm_min = bcd2bin(data);
data = i2c_smbus_read_byte_data(client, RX8025_REG_HR);
if (data < 0) {
dev_err(&client->dev, "Unable to read hour\n");
return -EIO;
}
我加载了一个rtc设备的驱动后，这样的提示是什么原因导致的呢？Input/output error
