Implement procfs interface for polling battery status of the RTC
via /proc/driver/rtc .
Signed-off-by: Marek Vasut <marex@xxxxxxx>
Cc: Alexandre Belloni <alexandre.belloni@xxxxxxxxxxxxxxxxxx>
---
drivers/rtc/rtc-abx80x.c | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)
diff --git a/drivers/rtc/rtc-abx80x.c b/drivers/rtc/rtc-abx80x.c
index 73830670a41f..4fab024fb508 100644
--- a/drivers/rtc/rtc-abx80x.c
+++ b/drivers/rtc/rtc-abx80x.c
@@ -78,6 +78,10 @@
#define ABX8XX_REG_ID0 0x28
+#define ABX8XX_REG_ANA_STATUS 0x2f
+#define ABX8XX_ANA_BREFD BIT(7)
+#define ABX8XX_ANA_BMIN BIT(6)
+
#define ABX8XX_REG_OUT_CTRL 0x30
#define ABX8XX_OUT_CTRL_EXDS BIT(4)
@@ -548,6 +552,25 @@ static int abx80x_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
}
}
+static int abx80x_proc(struct device *dev, struct seq_file *seq)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ int status, tmp;
+
+ status = i2c_smbus_read_byte_data(client, ABX8XX_REG_ANA_STATUS);
+ if (status < 0)
+ return status;
+
+ if (status & ABX8XX_ANA_BREFD)
+ seq_printf(seq, "battery\t\t: ok\n");
+ else if (status & ABX8XX_ANA_BMIN)
+ seq_printf(seq, "battery\t\t: low\n");
+ else
+ seq_printf(seq, "battery\t\t: exhausted\n");
+
+ return 0;
+}
+
static const struct rtc_class_ops abx80x_rtc_ops = {
.read_time = abx80x_rtc_read_time,
.set_time = abx80x_rtc_set_time,
@@ -555,6 +578,7 @@ static const struct rtc_class_ops abx80x_rtc_ops = {
.set_alarm = abx80x_set_alarm,
.alarm_irq_enable = abx80x_alarm_irq_enable,
.ioctl = abx80x_ioctl,
+ .proc = abx80x_proc,
};
static int abx80x_dt_trickle_cfg(struct device_node *np)
--
2.20.1
