diff options
Diffstat (limited to 'drivers/rtc/rtc-abx80x.c')
| -rw-r--r-- | drivers/rtc/rtc-abx80x.c | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/drivers/rtc/rtc-abx80x.c b/drivers/rtc/rtc-abx80x.c index d8e94edcb0ba..4d24f7288ad7 100644 --- a/drivers/rtc/rtc-abx80x.c +++ b/drivers/rtc/rtc-abx80x.c @@ -38,6 +38,7 @@ #define ABX8XX_REG_STATUS 0x0f #define ABX8XX_STATUS_AF BIT(2) +#define ABX8XX_STATUS_BLF BIT(4) #define ABX8XX_STATUS_WDT BIT(6) #define ABX8XX_REG_CTRL1 0x10 @@ -507,12 +508,49 @@ static int abx80x_alarm_irq_enable(struct device *dev, unsigned int enabled) return err; } +static int abx80x_ioctl(struct device *dev, unsigned int cmd, unsigned long arg) +{ + struct i2c_client *client = to_i2c_client(dev); + int status, tmp; + + switch (cmd) { + case RTC_VL_READ: + status = i2c_smbus_read_byte_data(client, ABX8XX_REG_STATUS); + if (status < 0) + return status; + + tmp = !!(status & ABX8XX_STATUS_BLF); + + if (copy_to_user((void __user *)arg, &tmp, sizeof(int))) + return -EFAULT; + + return 0; + + case RTC_VL_CLR: + status = i2c_smbus_read_byte_data(client, ABX8XX_REG_STATUS); + if (status < 0) + return status; + + status &= ~ABX8XX_STATUS_BLF; + + tmp = i2c_smbus_write_byte_data(client, ABX8XX_REG_STATUS, 0); + if (tmp < 0) + return tmp; + + return 0; + + default: + return -ENOIOCTLCMD; + } +} + static const struct rtc_class_ops abx80x_rtc_ops = { .read_time = abx80x_rtc_read_time, .set_time = abx80x_rtc_set_time, .read_alarm = abx80x_read_alarm, .set_alarm = abx80x_set_alarm, .alarm_irq_enable = abx80x_alarm_irq_enable, + .ioctl = abx80x_ioctl, }; static int abx80x_dt_trickle_cfg(struct device_node *np) |