From a696b31e2feeaa0ef99242adb9e771b0d3369a81 Mon Sep 17 00:00:00 2001 From: Michael Büsch Date: Thu, 10 Mar 2016 18:34:46 +0100 Subject: rtc: rv3029: Add thermometer hwmon support This adds support to - enable/disable the thermometer - set the temperature scanning interval - read the current temperature that is used for temp compensation. via hwmon interface Signed-off-by: Michael Buesch Signed-off-by: Alexandre Belloni --- drivers/rtc/Kconfig | 9 ++++ drivers/rtc/rtc-rv3029c2.c | 120 +++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 129 insertions(+) (limited to 'drivers/rtc') diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig index 987c50168fd8..d2cd206d2965 100644 --- a/drivers/rtc/Kconfig +++ b/drivers/rtc/Kconfig @@ -591,6 +591,15 @@ config RTC_DRV_RV3029C2 This driver can also be built as a module. If so, the module will be called rtc-rv3029c2. +config RTC_DRV_RV3029_HWMON + bool "HWMON support for RV3029" + depends on RTC_DRV_RV3029C2 && HWMON + depends on !(RTC_DRV_RV3029C2=y && HWMON=m) + default y + help + Say Y here if you want to expose temperature sensor data on + rtc-rv3029c2. + config RTC_DRV_RV8803 tristate "Micro Crystal RV8803" help diff --git a/drivers/rtc/rtc-rv3029c2.c b/drivers/rtc/rtc-rv3029c2.c index 3bbb581563c4..d0cbf08040cd 100644 --- a/drivers/rtc/rtc-rv3029c2.c +++ b/drivers/rtc/rtc-rv3029c2.c @@ -18,6 +18,8 @@ #include #include #include +#include +#include /* Register map */ @@ -637,6 +639,123 @@ static void rv3029_trickle_config(struct i2c_client *client) } } +#ifdef CONFIG_RTC_DRV_RV3029_HWMON + +static int rv3029_read_temp(struct i2c_client *client, int *temp_mC) +{ + int ret; + u8 temp; + + ret = rv3029_i2c_read_regs(client, RV3029_TEMP_PAGE, &temp, 1); + if (ret < 0) + return ret; + + *temp_mC = ((int)temp - 60) * 1000; + + return 0; +} + +static ssize_t rv3029_hwmon_show_temp(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct i2c_client *client = dev_get_drvdata(dev); + int ret, temp_mC; + + ret = rv3029_read_temp(client, &temp_mC); + if (ret < 0) + return ret; + + return sprintf(buf, "%d\n", temp_mC); +} + +static ssize_t rv3029_hwmon_set_update_interval(struct device *dev, + struct device_attribute *attr, + const char *buf, + size_t count) +{ + struct i2c_client *client = dev_get_drvdata(dev); + unsigned long interval_ms; + int ret; + u8 th_set_bits = 0; + + ret = kstrtoul(buf, 10, &interval_ms); + if (ret < 0) + return ret; + + if (interval_ms != 0) { + th_set_bits |= RV3029_EECTRL_THE; + if (interval_ms >= 16000) + th_set_bits |= RV3029_EECTRL_THP; + } + ret = rv3029_eeprom_update_bits(client, RV3029_CONTROL_E2P_EECTRL, + RV3029_EECTRL_THE | RV3029_EECTRL_THP, + th_set_bits); + if (ret < 0) + return ret; + + return count; +} + +static ssize_t rv3029_hwmon_show_update_interval(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct i2c_client *client = dev_get_drvdata(dev); + int ret, interval_ms; + u8 eectrl; + + ret = rv3029_eeprom_read(client, RV3029_CONTROL_E2P_EECTRL, + &eectrl, 1); + if (ret < 0) + return ret; + + if (eectrl & RV3029_EECTRL_THE) { + if (eectrl & RV3029_EECTRL_THP) + interval_ms = 16000; + else + interval_ms = 1000; + } else { + interval_ms = 0; + } + + return sprintf(buf, "%d\n", interval_ms); +} + +static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, rv3029_hwmon_show_temp, + NULL, 0); +static SENSOR_DEVICE_ATTR(update_interval, S_IWUSR | S_IRUGO, + rv3029_hwmon_show_update_interval, + rv3029_hwmon_set_update_interval, 0); + +static struct attribute *rv3029_hwmon_attrs[] = { + &sensor_dev_attr_temp1_input.dev_attr.attr, + &sensor_dev_attr_update_interval.dev_attr.attr, + NULL, +}; +ATTRIBUTE_GROUPS(rv3029_hwmon); + +static void rv3029_hwmon_register(struct i2c_client *client) +{ + struct device *hwmon_dev; + + hwmon_dev = devm_hwmon_device_register_with_groups( + &client->dev, client->name, client, rv3029_hwmon_groups); + if (IS_ERR(hwmon_dev)) { + dev_warn(&client->dev, + "unable to register hwmon device %ld\n", + PTR_ERR(hwmon_dev)); + } +} + +#else /* CONFIG_RTC_DRV_RV3029_HWMON */ + +static void rv3029_hwmon_register(struct i2c_client *client) +{ +} + +#endif /* CONFIG_RTC_DRV_RV3029_HWMON */ + static const struct rtc_class_ops rv3029_rtc_ops = { .read_time = rv3029_rtc_read_time, .set_time = rv3029_rtc_set_time, @@ -668,6 +787,7 @@ static int rv3029_probe(struct i2c_client *client, } rv3029_trickle_config(client); + rv3029_hwmon_register(client); rtc = devm_rtc_device_register(&client->dev, client->name, &rv3029_rtc_ops, THIS_MODULE); -- cgit v1.2.3