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rtc: rs5c372: Add RTC_VL_READ, RTC_VL_CLR ioctls

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In order to make it possible to get battery voltage status, this commit
adds RTC_VL_READ, RTC_VL_CLR ioctl commands to rtc-rs5c372.

Signed-off-by: Camel Guo <camelg@axis.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20211111083625.10216-1-camel.guo@axis.com
This commit is contained in:
Camel Guo 2021-11-11 09:36:25 +01:00 committed by Alexandre Belloni
parent fa55b7dcdc
commit f601aa7930
1 changed files with 55 additions and 0 deletions
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55
drivers/rtc/rtc-rs5c372.c
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@ -485,6 +485,60 @@ static int rs5c372_rtc_proc(struct device *dev, struct seq_file *seq)
#define rs5c372_rtc_proc NULL
#endif
#ifdef CONFIG_RTC_INTF_DEV
static int rs5c372_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
{
struct rs5c372 *rs5c = i2c_get_clientdata(to_i2c_client(dev));
unsigned char ctrl2;
int addr;
unsigned int flags;
dev_dbg(dev, "%s: cmd=%x\n", __func__, cmd);
addr = RS5C_ADDR(RS5C_REG_CTRL2);
ctrl2 = i2c_smbus_read_byte_data(rs5c->client, addr);
switch (cmd) {
case RTC_VL_READ:
flags = 0;
switch (rs5c->type) {
case rtc_r2025sd:
case rtc_r2221tl:
if ((rs5c->type == rtc_r2025sd && !(ctrl2 & R2x2x_CTRL2_XSTP)) ||
(rs5c->type == rtc_r2221tl && (ctrl2 & R2x2x_CTRL2_XSTP))) {
flags |= RTC_VL_DATA_INVALID;
}
if (ctrl2 & R2x2x_CTRL2_VDET)
flags |= RTC_VL_BACKUP_LOW;
break;
default:
if (ctrl2 & RS5C_CTRL2_XSTP)
flags |= RTC_VL_DATA_INVALID;
break;
}
return put_user(flags, (unsigned int __user *)arg);
case RTC_VL_CLR:
/* clear VDET bit */
if (rs5c->type == rtc_r2025sd || rs5c->type == rtc_r2221tl) {
ctrl2 &= ~R2x2x_CTRL2_VDET;
if (i2c_smbus_write_byte_data(rs5c->client, addr, ctrl2) < 0) {
dev_dbg(&rs5c->client->dev, "%s: write error in line %i\n",
__func__, __LINE__);
return -EIO;
}
}
return 0;
default:
return -ENOIOCTLCMD;
}
return 0;
}
#else
#define rs5c372_ioctl NULL
#endif
static const struct rtc_class_ops rs5c372_rtc_ops = {
.proc = rs5c372_rtc_proc,
.read_time = rs5c372_rtc_read_time,
@ -492,6 +546,7 @@ static const struct rtc_class_ops rs5c372_rtc_ops = {
.read_alarm = rs5c_read_alarm,
.set_alarm = rs5c_set_alarm,
.alarm_irq_enable = rs5c_rtc_alarm_irq_enable,
.ioctl = rs5c372_ioctl,
};
#if IS_ENABLED(CONFIG_RTC_INTF_SYSFS)