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rtc: rv3029: Add thermometer hwmon support

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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 <m@bues.ch>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
This commit is contained in:
Michael Büsch 2016-03-10 18:34:46 +01:00 committed by Alexandre Belloni
parent 39387dc2cf
commit a696b31e2f
2 changed files with 129 additions and 0 deletions
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9
drivers/rtc/Kconfig
View file

@ -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

120
drivers/rtc/rtc-rv3029c2.c
View file

@ -18,6 +18,8 @@
#include <linux/rtc.h>
#include <linux/delay.h>
#include <linux/of.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
/* 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);