The HW has some predefined points where it will associate a PWM value.
However some users might want to better set these points to their
usecases. This patch exposes these points as pwm auto_points:
* pwm1_auto_point1_temp: temperature threshold below which PWM should be
0%;
* pwm1_auto_point2_temp: temperature threshold above which PWM should be
25%;
* pwm1_auto_point3_temp: temperature threshold below which PWM should be
25%;
* pwm1_auto_point4_temp: temperature threshold above which PWM should be
50%;
* pwm1_auto_point5_temp: temperature threshold below which PWM should be
50%;
* pwm1_auto_point6_temp: temperature threshold above which PWM should be
75%;
* pwm1_auto_point7_temp: temperature threshold below which PWM should be
75%;
* pwm1_auto_point8_temp: temperature threshold above which PWM should be
100%;
Signed-off-by: Nuno Sá <nuno.sa@xxxxxxxxxx>
---
drivers/hwmon/axi-fan-control.c | 74 ++++++++++++++++++++++++++++++++-
1 file changed, 73 insertions(+), 1 deletion(-)
diff --git a/drivers/hwmon/axi-fan-control.c b/drivers/hwmon/axi-fan-control.c
index 59c9babb3850..80b216448f47 100644
--- a/drivers/hwmon/axi-fan-control.c
+++ b/drivers/hwmon/axi-fan-control.c
@@ -8,6 +8,7 @@
#include <linux/clk.h>
#include <linux/fpga/adi-axi-common.h>
#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/kernel.h>
@@ -31,6 +32,14 @@
#define ADI_REG_TACH_50_TOL 0x0154
#define ADI_REG_TACH_75_TOL 0x0158
#define ADI_REG_TACH_100_TOL 0x015c
+#define ADI_REG_TEMP_00_H 0x0100
+#define ADI_REG_TEMP_25_L 0x0104
+#define ADI_REG_TEMP_25_H 0x0108
+#define ADI_REG_TEMP_50_L 0x010c
+#define ADI_REG_TEMP_50_H 0x0110
+#define ADI_REG_TEMP_75_L 0x0114
+#define ADI_REG_TEMP_75_H 0x0118
+#define ADI_REG_TEMP_100_L 0x011c
#define ADI_REG_IRQ_MASK 0x0040
#define ADI_REG_IRQ_PENDING 0x0044
@@ -70,6 +79,39 @@ static inline u32 axi_ioread(const u32 reg,
return ioread32(ctl->base + reg);
}
+/*
+ * The core calculates the temperature as:
+ * T = /raw * 509.3140064 / 65535) - 280.2308787
+ */
+static ssize_t axi_fan_control_show(struct device *dev, struct device_attribute *da, char *buf)
+{
+ struct axi_fan_control_data *ctl = dev_get_drvdata(dev);
+ struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
+ u32 temp = axi_ioread(attr->index, ctl);
+
+ temp = DIV_ROUND_CLOSEST_ULL(temp * 509314ULL, 65535) - 280230;
+
+ return sprintf(buf, "%u\n", temp);
+}
+
+static ssize_t axi_fan_control_store(struct device *dev, struct device_attribute *da,
+ const char *buf, size_t count)
+{
+ struct axi_fan_control_data *ctl = dev_get_drvdata(dev);
+ struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
+ u32 temp;
+ int ret;
+
+ ret = kstrtou32(buf, 10, &temp);
+ if (ret)
+ return ret;
+
+ temp = DIV_ROUND_CLOSEST_ULL((temp + 280230) * 65535ULL, 509314);
+ axi_iowrite(temp, attr->index, ctl);
+
+ return count;
+}
+
static long axi_fan_control_get_pwm_duty(const struct axi_fan_control_data *ctl)
{
u32 pwm_width = axi_ioread(ADI_REG_PWM_WIDTH, ctl);
@@ -418,6 +460,36 @@ static const struct hwmon_chip_info axi_chip_info = {
.info = axi_fan_control_info,
};
+/* temperature threshold below which PWM should be 0% */
+static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point1_temp, axi_fan_control, ADI_REG_TEMP_00_H);
+/* temperature threshold above which PWM should be 25% */
+static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point2_temp, axi_fan_control, ADI_REG_TEMP_25_L);
+/* temperature threshold below which PWM should be 25% */
+static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point3_temp, axi_fan_control, ADI_REG_TEMP_25_H);
+/* temperature threshold above which PWM should be 50% */
+static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point4_temp, axi_fan_control, ADI_REG_TEMP_50_L);
+/* temperature threshold below which PWM should be 50% */
+static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point5_temp, axi_fan_control, ADI_REG_TEMP_50_H);
+/* temperature threshold above which PWM should be 75% */
+static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point6_temp, axi_fan_control, ADI_REG_TEMP_75_L);
+/* temperature threshold below which PWM should be 75% */
+static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point7_temp, axi_fan_control, ADI_REG_TEMP_75_H);
+/* temperature threshold above which PWM should be 100% */
+static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point8_temp, axi_fan_control, ADI_REG_TEMP_100_L);
+
+static struct attribute *axi_fan_control_attrs[] = {
+ &sensor_dev_attr_pwm1_auto_point1_temp.dev_attr.attr,
+ &sensor_dev_attr_pwm1_auto_point2_temp.dev_attr.attr,
+ &sensor_dev_attr_pwm1_auto_point3_temp.dev_attr.attr,
+ &sensor_dev_attr_pwm1_auto_point4_temp.dev_attr.attr,
+ &sensor_dev_attr_pwm1_auto_point5_temp.dev_attr.attr,
+ &sensor_dev_attr_pwm1_auto_point6_temp.dev_attr.attr,
+ &sensor_dev_attr_pwm1_auto_point7_temp.dev_attr.attr,
+ &sensor_dev_attr_pwm1_auto_point8_temp.dev_attr.attr,
+ NULL,
+};
+ATTRIBUTE_GROUPS(axi_fan_control);
+
static const u32 version_1_0_0 = ADI_AXI_PCORE_VER(1, 0, 'a');
static const struct of_device_id axi_fan_control_of_match[] = {
@@ -502,7 +574,7 @@ static int axi_fan_control_probe(struct platform_device *pdev)
name,
ctl,
&axi_chip_info,
- NULL);
+ axi_fan_control_groups);
return PTR_ERR_OR_ZERO(ctl->hdev);
}
--
2.32.0
