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| author | Camel Guo <camelg@axis.com> | 2021-11-11 09:36:25 +0100 |
|---|---|---|
| committer | Alexandre Belloni <alexandre.belloni@bootlin.com> | 2021-12-01 00:05:42 +0100 |
| commit | f601aa7930669439623dd266fc9e90b0218b42c1 (patch) | |
| tree | af00c2cec6042e7df44dcd631f7bb1ba999557f6 /drivers/rtc | |
| parent | fa55b7dcdc43c1aa1ba12bca9d2dd4318c2a0dbf (diff) | |
| download | lwn-f601aa7930669439623dd266fc9e90b0218b42c1.tar.gz lwn-f601aa7930669439623dd266fc9e90b0218b42c1.zip | |
rtc: rs5c372: Add RTC_VL_READ, RTC_VL_CLR ioctls
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
Diffstat (limited to 'drivers/rtc')
| -rw-r--r-- | drivers/rtc/rtc-rs5c372.c | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/drivers/rtc/rtc-rs5c372.c b/drivers/rtc/rtc-rs5c372.c index 80980414890c..955513514179 100644 --- a/drivers/rtc/rtc-rs5c372.c +++ b/drivers/rtc/rtc-rs5c372.c @@ -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) |