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rtc: abx80x: Implement RTC_VL_READ,CLR ioctls 

Implement standard ioctls for polling the battery status and clearing
the battery low indication from userspace.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
This commit is contained in:
Marek Vasut 2018-12-07 18:40:53 +01:00 committed by Alexandre Belloni
parent fc979933bc
commit ffe1c5a2d4
1 changed files with 38 additions and 0 deletions
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38
drivers/rtc/rtc-abx80x.c
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@ -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)