static int max8998_rtc_i2c_read(struct i2c_client *client, u8 reg, u8 *data, int len)
{
int ret;
u8 buf[2];
struct i2c_msg msg[2];
max8998_dbg("%s\n", __func__);
buf[0] = reg;
msg[0].addr = client->addr;
msg[0].flags = 0;
msg[0].len = 1;
msg[0].buf = buf;
msg[1].addr = client->addr;
msg[1].flags = I2C_M_RD;
msg[1].len = len;
msg[1].buf = data;
ret = i2c_transfer(client->adapter, msg, 2);
if (ret != 2)
return -EIO;
#if MAX8998RTC_DEBUG
int i;
for(i = 0; i < len ; i++)
max8998_dbg(" %d : %x \n",i,*(data + i));
#endif
return 0;
}
static int max8998_rtc_i2c_write(struct i2c_client *client, u8 reg, u8 *data,int len)
{
int ret;
struct i2c_msg msg[1];
max8998_dbg("%s\n", __func__);
data[0] = reg;
#if MAX8998RTC_DEBUG
int i;
for(i = 0; i < len ; i++)
max8998_dbg(" %d : %x \n",i,*(data + i));
#endif
msg[0].addr = client->addr;
msg[0].flags = 0;
msg[0].len = len;
msg[0].buf = data;
ret = i2c_transfer(client->adapter, msg, 1);
max8998_dbg(" max8998 i2c write ret %d\n",ret);
if (ret != 1)
return -EIO;
return 0;
}
int max8998_rtc_read_time(struct rtc_time *tm)
{
int ret;
max8998_dbg("%s \n", __func__);
ret = max8998_rtc_i2c_read_time(max8998_rtc_i2c_client, tm);
max8998_dbg("read %s time %02d.%02d.%02d %02d/%02d/%02d\n",__func__,
tm->tm_year, tm->tm_mon, tm->tm_mday,
tm->tm_hour, tm->tm_min, tm->tm_sec);
return ret;
}
int max8998_rtc_set_time(struct rtc_time *tm)
{
max8998_dbg("%s %02d.%02d.%02d %02d/%02d/%02d\n",__func__,
tm->tm_year, tm->tm_mon, tm->tm_mday,
tm->tm_hour, tm->tm_min, tm->tm_sec);
return max8998_rtc_i2c_set_time(max8998_rtc_i2c_client, tm);
}
static int max8998_rtc_i2c_set_time(struct i2c_client *client, struct rtc_time *tm)
{
int ret;
u8 regs[MAX8998_RTC_LEN + 1], temp_reg = 0;
#ifdef CONFIG_RTC_DRV_S3C
tm->tm_year += 2000;
#else
tm->tm_year += 1900;
#endif
regs[MAX8998_REG_SECOND + 1] = bin2bcd(tm->tm_sec);
regs[MAX8998_REG_MIN + 1] = bin2bcd(tm->tm_min);
regs[MAX8998_REG_HOUR + 1] = bin2bcd(tm->tm_hour);
regs[MAX8998_REG_WEEKDAY + 1] = bin2bcd(tm->tm_wday);
regs[MAX8998_REG_DATE + 1] = bin2bcd(tm->tm_mday);
regs[MAX8998_REG_MONTH + 1] = bin2bcd(tm->tm_mon + 1);
regs[MAX8998_REG_YEAR0 + 1] = bin2bcd(tm->tm_year % 100);
regs[MAX8998_REG_YEAR1 + 1] = bin2bcd((tm->tm_year / 100));
do {
ret = max8998_rtc_i2c_write(client, MAX8998_RTC_TIME_ADDR, regs, MAX8998_RTC_LEN + 1);
max8998_rtc_i2c_read(client, MAX8998_RTC_TIME_ADDR, &temp_reg, 1);
max8998_dbg("%s : 1st %x, 2nd %x\n", __func__, regs[MAX8998_REG_SECOND + 1], temp_reg);
} while (regs[MAX8998_REG_SECOND + 1] > temp_reg);
return ret;
}
static int max8998_rtc_i2c_read_time(struct i2c_client *client, struct rtc_time *tm)
{
int ret;
u8 regs[MAX8998_RTC_LEN], temp_reg = 0;
do {
ret = max8998_rtc_i2c_read(client, MAX8998_RTC_TIME_ADDR, regs, MAX8998_RTC_LEN);
if (ret < 0)
return ret;
max8998_rtc_i2c_read(client, MAX8998_RTC_TIME_ADDR, &temp_reg, 1);
max8998_dbg("%s : 1st %x, 2nd %x\n", __func__, regs[MAX8998_REG_SECOND], temp_reg);
} while (regs[MAX8998_REG_SECOND] > temp_reg);
tm->tm_sec = bcd2bin(regs[MAX8998_REG_SECOND]);
tm->tm_min = bcd2bin(regs[MAX8998_REG_MIN]);
tm->tm_hour = bcd2bin(regs[MAX8998_REG_HOUR] & 0x3f);
if (regs[MAX8998_REG_HOUR] & (1 << 7))
tm->tm_hour += 12;
tm->tm_wday = bcd2bin(regs[MAX8998_REG_WEEKDAY]);
tm->tm_mday = bcd2bin(regs[MAX8998_REG_DATE]);
tm->tm_mon = bcd2bin(regs[MAX8998_REG_MONTH]) - 1;
#ifdef CONFIG_RTC_DRV_S3C
tm->tm_year = bcd2bin(regs[MAX8998_REG_YEAR0]) + bcd2bin(regs[MAX8998_REG_YEAR1]) * 100 - 2000;
#else
tm->tm_year = bcd2bin(regs[MAX8998_REG_YEAR0]) + bcd2bin(regs[MAX8998_REG_YEAR1]) * 100 - 1900;
#endif
return 0;
}
static int __init s3c_max8998_rtc_init(void)
{
int ret;
max8998_dbg("%s\n", __func__);
if ((ret = i2c_add_driver(&max8998_rtc_i2c_driver)))
pr_err("%s: Can't add max8998_rtc_ i2c drv\n", __func__);
return ret;
}
static void __exit s3c_max8998_rtc_exit(void)
{
max8998_dbg("%s\n", __func__);
i2c_del_driver(&max8998_rtc_i2c_driver);
}
