mirror of
https://github.com/Ysurac/openmptcprouter.git
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153 lines
4.3 KiB
Diff
153 lines
4.3 KiB
Diff
From f8fe47630f12169ad7b5f41efc39a90aded37648 Mon Sep 17 00:00:00 2001
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From: Jonathan Bell <jonathan@raspberrypi.com>
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Date: Fri, 15 Sep 2023 17:33:03 +0100
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Subject: [PATCH] drivers: rtc-rpi: add battery charge circuit control and
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readback
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Parse devicetree for a charger voltage and apply it. If nonzero and a
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valid voltage, the firmware will enable charging, otherwise the charger
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circuit is disabled.
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Add sysfs attributes to read back the supported charge voltage range,
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the measured battery voltage, and the charger setpoint.
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Signed-off-by: Jonathan Bell <jonathan@raspberrypi.com>
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---
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drivers/rtc/rtc-rpi.c | 106 ++++++++++++++++++++++++++++++++++++++++--
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1 file changed, 103 insertions(+), 3 deletions(-)
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--- a/drivers/rtc/rtc-rpi.c
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+++ b/drivers/rtc/rtc-rpi.c
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@@ -19,11 +19,22 @@
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struct rpi_rtc_data {
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struct rtc_device *rtc;
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struct rpi_firmware *fw;
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+ u32 bbat_vchg_microvolts;
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};
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#define RPI_FIRMWARE_GET_RTC_REG 0x00030087
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#define RPI_FIRMWARE_SET_RTC_REG 0x00038087
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-enum {RTC_TIME, RTC_ALARM, RTC_ALARM_PENDING, RTC_ALARM_ENABLE};
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+
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+enum {
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+ RTC_TIME,
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+ RTC_ALARM,
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+ RTC_ALARM_PENDING,
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+ RTC_ALARM_ENABLE,
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+ RTC_BBAT_CHG_VOLTS,
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+ RTC_BBAT_CHG_VOLTS_MIN,
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+ RTC_BBAT_CHG_VOLTS_MAX,
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+ RTC_BBAT_VOLTS
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+};
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static int rpi_rtc_read_time(struct device *dev, struct rtc_time *tm)
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{
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@@ -114,6 +125,83 @@ static const struct rtc_class_ops rpi_rt
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.alarm_irq_enable = rpi_rtc_alarm_irq_enable,
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};
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+static int rpi_rtc_set_charge_voltage(struct device *dev)
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+{
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+ struct rpi_rtc_data *vrtc = dev_get_drvdata(dev);
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+ u32 data[2] = {RTC_BBAT_CHG_VOLTS, vrtc->bbat_vchg_microvolts};
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+ int err;
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+
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+ err = rpi_firmware_property(vrtc->fw, RPI_FIRMWARE_SET_RTC_REG,
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+ &data, sizeof(data));
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+
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+ if (err)
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+ dev_err(dev, "failed to set trickle charge voltage to %uuV: %d\n",
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+ vrtc->bbat_vchg_microvolts, err);
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+ else if (vrtc->bbat_vchg_microvolts)
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+ dev_info(dev, "trickle charging enabled at %uuV\n",
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+ vrtc->bbat_vchg_microvolts);
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+
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+ return err;
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+}
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+
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+static ssize_t rpi_rtc_print_uint_reg(struct device *dev, char *buf, u32 reg)
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+{
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+ struct rpi_rtc_data *vrtc = dev_get_drvdata(dev->parent);
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+ u32 data[2] = {reg, 0};
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+ int ret = 0;
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+
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+ ret = rpi_firmware_property(vrtc->fw, RPI_FIRMWARE_GET_RTC_REG,
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+ &data, sizeof(data));
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+ if (ret < 0)
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+ return ret;
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+
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+ return sprintf(buf, "%u\n", data[1]);
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+}
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+
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+static ssize_t charging_voltage_show(struct device *dev,
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+ struct device_attribute *attr,
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+ char *buf)
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+{
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+ return rpi_rtc_print_uint_reg(dev, buf, RTC_BBAT_CHG_VOLTS);
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+}
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+static DEVICE_ATTR_RO(charging_voltage);
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+
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+static ssize_t charging_voltage_min_show(struct device *dev,
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+ struct device_attribute *attr,
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+ char *buf)
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+{
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+ return rpi_rtc_print_uint_reg(dev, buf, RTC_BBAT_CHG_VOLTS_MIN);
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+}
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+static DEVICE_ATTR_RO(charging_voltage_min);
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+
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+static ssize_t charging_voltage_max_show(struct device *dev,
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+ struct device_attribute *attr,
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+ char *buf)
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+{
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+ return rpi_rtc_print_uint_reg(dev, buf, RTC_BBAT_CHG_VOLTS_MAX);
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+}
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+static DEVICE_ATTR_RO(charging_voltage_max);
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+
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+static ssize_t battery_voltage_show(struct device *dev,
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+ struct device_attribute *attr,
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+ char *buf)
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+{
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+ return rpi_rtc_print_uint_reg(dev, buf, RTC_BBAT_VOLTS);
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+}
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+static DEVICE_ATTR_RO(battery_voltage);
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+
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+static struct attribute *rpi_rtc_attrs[] = {
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+ &dev_attr_charging_voltage.attr,
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+ &dev_attr_charging_voltage_min.attr,
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+ &dev_attr_charging_voltage_max.attr,
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+ &dev_attr_battery_voltage.attr,
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+ NULL
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+};
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+
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+static const struct attribute_group rpi_rtc_sysfs_files = {
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+ .attrs = rpi_rtc_attrs,
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+};
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+
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static int rpi_rtc_probe(struct platform_device *pdev)
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{
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struct rpi_rtc_data *vrtc;
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@@ -151,10 +239,22 @@ static int rpi_rtc_probe(struct platform
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clear_bit(RTC_FEATURE_UPDATE_INTERRUPT, vrtc->rtc->features);
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vrtc->rtc->ops = &rpi_rtc_ops;
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- ret = devm_rtc_register_device(vrtc->rtc);
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+ ret = rtc_add_group(vrtc->rtc, &rpi_rtc_sysfs_files);
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+ if (ret)
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+ return ret;
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rpi_rtc_alarm_clear_pending(dev);
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- return ret;
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+
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+ /*
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+ * Optionally enable trickle charging - if the property isn't
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+ * present (or set to zero), trickle charging is disabled.
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+ */
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+ of_property_read_u32(np, "trickle-charge-microvolt",
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+ &vrtc->bbat_vchg_microvolts);
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+
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+ rpi_rtc_set_charge_voltage(dev);
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+
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+ return devm_rtc_register_device(vrtc->rtc);
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}
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static const struct of_device_id rpi_rtc_dt_match[] = {
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