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path: root/drivers/hwmon/scpi-hwmon.c
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Diffstat (limited to 'drivers/hwmon/scpi-hwmon.c')
-rw-r--r--drivers/hwmon/scpi-hwmon.c54
1 files changed, 48 insertions, 6 deletions
diff --git a/drivers/hwmon/scpi-hwmon.c b/drivers/hwmon/scpi-hwmon.c
index 094f948f99ff..a586480a7ca9 100644
--- a/drivers/hwmon/scpi-hwmon.c
+++ b/drivers/hwmon/scpi-hwmon.c
@@ -16,6 +16,7 @@
#include <linux/hwmon.h>
#include <linux/module.h>
+#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/scpi_protocol.h>
#include <linux/slab.h>
@@ -23,6 +24,7 @@
#include <linux/thermal.h>
struct sensor_data {
+ unsigned int scale;
struct scpi_sensor_info info;
struct device_attribute dev_attr_input;
struct device_attribute dev_attr_label;
@@ -44,6 +46,30 @@ struct scpi_sensors {
const struct attribute_group *groups[2];
};
+static const u32 gxbb_scpi_scale[] = {
+ [TEMPERATURE] = 1, /* (celsius) */
+ [VOLTAGE] = 1000, /* (millivolts) */
+ [CURRENT] = 1000, /* (milliamperes) */
+ [POWER] = 1000000, /* (microwatts) */
+ [ENERGY] = 1000000, /* (microjoules) */
+};
+
+static const u32 scpi_scale[] = {
+ [TEMPERATURE] = 1000, /* (millicelsius) */
+ [VOLTAGE] = 1000, /* (millivolts) */
+ [CURRENT] = 1000, /* (milliamperes) */
+ [POWER] = 1000000, /* (microwatts) */
+ [ENERGY] = 1000000, /* (microjoules) */
+};
+
+static void scpi_scale_reading(u64 *value, struct sensor_data *sensor)
+{
+ if (scpi_scale[sensor->info.class] != sensor->scale) {
+ *value *= scpi_scale[sensor->info.class];
+ do_div(*value, sensor->scale);
+ }
+}
+
static int scpi_read_temp(void *dev, int *temp)
{
struct scpi_thermal_zone *zone = dev;
@@ -57,6 +83,8 @@ static int scpi_read_temp(void *dev, int *temp)
if (ret)
return ret;
+ scpi_scale_reading(&value, sensor);
+
*temp = value;
return 0;
}
@@ -77,6 +105,8 @@ scpi_show_sensor(struct device *dev, struct device_attribute *attr, char *buf)
if (ret)
return ret;
+ scpi_scale_reading(&value, sensor);
+
return sprintf(buf, "%llu\n", value);
}
@@ -94,14 +124,23 @@ static struct thermal_zone_of_device_ops scpi_sensor_ops = {
.get_temp = scpi_read_temp,
};
+static const struct of_device_id scpi_of_match[] = {
+ {.compatible = "arm,scpi-sensors", .data = &scpi_scale},
+ {.compatible = "amlogic,meson-gxbb-scpi-sensors", .data = &gxbb_scpi_scale},
+ {},
+};
+MODULE_DEVICE_TABLE(of, scpi_of_match);
+
static int scpi_hwmon_probe(struct platform_device *pdev)
{
u16 nr_sensors, i;
+ const u32 *scale;
int num_temp = 0, num_volt = 0, num_current = 0, num_power = 0;
int num_energy = 0;
struct scpi_ops *scpi_ops;
struct device *hwdev, *dev = &pdev->dev;
struct scpi_sensors *scpi_sensors;
+ const struct of_device_id *of_id;
int idx, ret;
scpi_ops = get_scpi_ops();
@@ -131,6 +170,13 @@ static int scpi_hwmon_probe(struct platform_device *pdev)
scpi_sensors->scpi_ops = scpi_ops;
+ of_id = of_match_device(scpi_of_match, &pdev->dev);
+ if (!of_id) {
+ dev_err(&pdev->dev, "Unable to initialize scpi-hwmon data\n");
+ return -ENODEV;
+ }
+ scale = of_id->data;
+
for (i = 0, idx = 0; i < nr_sensors; i++) {
struct sensor_data *sensor = &scpi_sensors->data[idx];
@@ -178,6 +224,8 @@ static int scpi_hwmon_probe(struct platform_device *pdev)
continue;
}
+ sensor->scale = scale[sensor->info.class];
+
sensor->dev_attr_input.attr.mode = S_IRUGO;
sensor->dev_attr_input.show = scpi_show_sensor;
sensor->dev_attr_input.attr.name = sensor->input;
@@ -247,12 +295,6 @@ static int scpi_hwmon_probe(struct platform_device *pdev)
return 0;
}
-static const struct of_device_id scpi_of_match[] = {
- {.compatible = "arm,scpi-sensors"},
- {},
-};
-MODULE_DEVICE_TABLE(of, scpi_of_match);
-
static struct platform_driver scpi_hwmon_platdrv = {
.driver = {
.name = "scpi-hwmon",