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hwmon: (axi-fan-control) Support temperature vs pwm points 

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_hyst: temperature threshold below which PWM should
   be 0%;
 * pwm1_auto_point1_temp: temperature threshold above which PWM should be
   25%;
 * pwm1_auto_point2_temp_hyst: temperature threshold below which PWM should
   be 25%;
 * pwm1_auto_point2_temp: temperature threshold above which PWM should be
   50%;
 * pwm1_auto_point3_temp_hyst: temperature threshold below which PWM should
   be 50%;
 * pwm1_auto_point3_temp: temperature threshold above which PWM should be
   75%;
 * pwm1_auto_point4_temp_hyst: temperature threshold below which PWM should
   be 75%;
 * pwm1_auto_point4_temp: temperature threshold above which PWM should be
   100%;

Signed-off-by: Nuno Sá <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20210811114853.159298-4-nuno.sa@analog.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Nuno Sá 2021-08-11 13:48:53 +02:00 committed by Guenter Roeck
parent e66705de82
commit 2aee7e67be
1 changed files with 73 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

74
drivers/hwmon/axi-fan-control.c
View File

@ -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>
@ -23,6 +24,14 @@
#define ADI_REG_PWM_PERIOD 0x00c0
#define ADI_REG_TACH_MEASUR 0x00c4
#define ADI_REG_TEMPERATURE 0x00c8
#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
@ -62,6 +71,39 @@ 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);
@ -375,6 +417,36 @@ 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_hyst, axi_fan_control, ADI_REG_TEMP_00_H);
/* temperature threshold above which PWM should be 25% */
static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point1_temp, axi_fan_control, ADI_REG_TEMP_25_L);
/* temperature threshold below which PWM should be 25% */
static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point2_temp_hyst, axi_fan_control, ADI_REG_TEMP_25_H);
/* temperature threshold above which PWM should be 50% */
static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point2_temp, axi_fan_control, ADI_REG_TEMP_50_L);
/* temperature threshold below which PWM should be 50% */
static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point3_temp_hyst, axi_fan_control, ADI_REG_TEMP_50_H);
/* temperature threshold above which PWM should be 75% */
static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point3_temp, axi_fan_control, ADI_REG_TEMP_75_L);
/* temperature threshold below which PWM should be 75% */
static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point4_temp_hyst, axi_fan_control, ADI_REG_TEMP_75_H);
/* temperature threshold above which PWM should be 100% */
static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point4_temp, axi_fan_control, ADI_REG_TEMP_100_L);
static struct attribute *axi_fan_control_attrs[] = {
&sensor_dev_attr_pwm1_auto_point1_temp_hyst.dev_attr.attr,
&sensor_dev_attr_pwm1_auto_point1_temp.dev_attr.attr,
&sensor_dev_attr_pwm1_auto_point2_temp_hyst.dev_attr.attr,
&sensor_dev_attr_pwm1_auto_point2_temp.dev_attr.attr,
&sensor_dev_attr_pwm1_auto_point3_temp_hyst.dev_attr.attr,
&sensor_dev_attr_pwm1_auto_point3_temp.dev_attr.attr,
&sensor_dev_attr_pwm1_auto_point4_temp_hyst.dev_attr.attr,
&sensor_dev_attr_pwm1_auto_point4_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[] = {
@ -459,7 +531,7 @@ 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);
}