lkml.org 
[lkml]   [2017]   [Jun]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
DS3232/DS3234 has the temperature registers with a resolution of 0.25
degree celsius. This enables to get the value through hwmon.

# cat /sys/class/hwmon/hwmon0/temp1_input
37250

Signed-off-by: Kirill Esipov <yesipov@gmail.com>
---
drivers/rtc/Kconfig | 9 ++++
drivers/rtc/rtc-ds3232.c | 134 +++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 143 insertions(+)

diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index 8d3b95728326..b4a6a916d4df 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -791,6 +791,15 @@ config RTC_DRV_DS3232
This driver can also be built as a module. If so, the module
will be called rtc-ds3232.

+config RTC_DRV_DS3232_HWMON
+ bool "HWMON support for Dallas/Maxim DS3232/DS3234"
+ depends on RTC_DRV_DS3232 && HWMON
+ depends on !(RTC_DRV_DS3232=y && HWMON=m)
+ default y
+ help
+ Say Y here if you want to expose temperature sensor data on
+ rtc-ds3232
+
config RTC_DRV_PCF2127
tristate "NXP PCF2127"
depends on RTC_I2C_AND_SPI
diff --git a/drivers/rtc/rtc-ds3232.c b/drivers/rtc/rtc-ds3232.c
index deff431a37c4..4e7913c2ed79 100644
--- a/drivers/rtc/rtc-ds3232.c
+++ b/drivers/rtc/rtc-ds3232.c
@@ -22,6 +22,7 @@
#include <linux/bcd.h>
#include <linux/slab.h>
#include <linux/regmap.h>
+#include <linux/hwmon.h>

#define DS3232_REG_SECONDS 0x00
#define DS3232_REG_MINUTES 0x01
@@ -275,6 +276,137 @@ static int ds3232_update_alarm(struct device *dev, unsigned int enabled)
return ret;
}

+/*----------------------------------------------------------------------*/
+
+#ifdef CONFIG_RTC_DRV_DS3232_HWMON
+
+/*
+ * Temperature sensor support for ds3232/ds3234 devices.
+ */
+
+#define DS3232_REG_TEMPERATURE 0x11
+
+/*
+ * A user-initiated temperature conversion is not started by this function,
+ * so the temperature is updated once every 64 seconds.
+ */
+static int ds3232_hwmon_read_temp(struct device *dev, long int *mC)
+{
+ struct ds3232 *ds3232 = dev_get_drvdata(dev);
+ u8 temp_buf[2];
+ s16 temp;
+ int ret;
+
+ ret = regmap_bulk_read(ds3232->regmap, DS3232_REG_TEMPERATURE, temp_buf,
+ sizeof(temp_buf));
+
+ if (ret < 0)
+ return ret;
+
+ /*
+ * Temperature is represented as a 10-bit code with a resolution of
+ * 0.25 degree celsius and encoded in two's complement format.
+ */
+ temp = (temp_buf[0] << 8) | temp_buf[1];
+ temp >>= 6;
+ *mC = temp * 250;
+
+ return 0;
+}
+
+static umode_t ds3232_hwmon_is_visible(const void *data,
+ enum hwmon_sensor_types type,
+ u32 attr, int channel)
+{
+ if (type != hwmon_temp)
+ return 0;
+
+ switch (attr) {
+ case hwmon_temp_input:
+ return 0444;
+ default:
+ return 0;
+ }
+}
+
+static int ds3232_hwmon_read(struct device *dev,
+ enum hwmon_sensor_types type,
+ u32 attr, int channel, long *temp)
+{
+ int err;
+
+ switch (attr) {
+ case hwmon_temp_input:
+ ds3232_hwmon_read_temp(dev, temp);
+ err = 0;
+ break;
+ default:
+ return -EOPNOTSUPP;
+ }
+
+ return err;
+}
+
+
+static u32 ds3232_hwmon_chip_config[] = {
+ HWMON_C_REGISTER_TZ,
+ 0
+};
+
+static const struct hwmon_channel_info ds3232_hwmon_chip = {
+ .type = hwmon_chip,
+ .config = ds3232_hwmon_chip_config,
+};
+
+static u32 ds3232_hwmon_temp_config[] = {
+ HWMON_T_INPUT,
+ 0
+};
+
+static const struct hwmon_channel_info ds3232_hwmon_temp = {
+ .type = hwmon_temp,
+ .config = ds3232_hwmon_temp_config,
+};
+
+static const struct hwmon_channel_info *ds3232_hwmon_info[] = {
+ &ds3232_hwmon_chip,
+ &ds3232_hwmon_temp,
+ NULL
+};
+
+static const struct hwmon_ops ds3232_hwmon_hwmon_ops = {
+ .is_visible = ds3232_hwmon_is_visible,
+ .read = ds3232_hwmon_read,
+};
+
+static const struct hwmon_chip_info ds3232_hwmon_chip_info = {
+ .ops = &ds3232_hwmon_hwmon_ops,
+ .info = ds3232_hwmon_info,
+};
+
+static void ds3232_hwmon_register(struct device *dev, const char *name)
+{
+ struct ds3232 *ds3232 = dev_get_drvdata(dev);
+ struct device *hwmon_dev;
+
+ hwmon_dev = devm_hwmon_device_register_with_info(dev, name, ds3232,
+ &ds3232_hwmon_chip_info,
+ NULL);
+
+ if (IS_ERR(hwmon_dev)) {
+ dev_warn(dev, "unable to register hwmon device %ld\n",
+ PTR_ERR(hwmon_dev));
+ }
+}
+
+#else
+
+static void ds3232_hwmon_register(struct device *dev, const char *name)
+{
+}
+
+#endif
+
static int ds3232_alarm_irq_enable(struct device *dev, unsigned int enabled)
{
struct ds3232 *ds3232 = dev_get_drvdata(dev);
@@ -366,6 +498,8 @@ static int ds3232_probe(struct device *dev, struct regmap *regmap, int irq,
if (ds3232->irq > 0)
device_init_wakeup(dev, 1);

+ ds3232_hwmon_register(dev, name);
+
ds3232->rtc = devm_rtc_device_register(dev, name, &ds3232_rtc_ops,
THIS_MODULE);
if (IS_ERR(ds3232->rtc))
--
2.7.4
\
 
 \ /
  Last update: 2017-06-22 20:04    [W:0.055 / U:0.236 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site