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mlxsw: core: Implement fan control using hwmon

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ASIC provides access to fans. Implement their exposure to userspace
using hwmon.

Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jiri Pirko 2015-11-27 13:45:59 +01:00 committed by David S. Miller
parent 5246f2e29a
commit 52581961d8
1 changed files with 120 additions and 1 deletions
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121
drivers/net/ethernet/mellanox/mlxsw/core_hwmon.c
View File

@ -42,7 +42,8 @@
#include "core.h"
#define MLXSW_HWMON_TEMP_SENSOR_MAX_COUNT 127
#define MLXSW_HWMON_ATTR_COUNT (MLXSW_HWMON_TEMP_SENSOR_MAX_COUNT * 4)
#define MLXSW_HWMON_ATTR_COUNT (MLXSW_HWMON_TEMP_SENSOR_MAX_COUNT * 4 + \
MLXSW_MFCR_TACHOS_MAX + MLXSW_MFCR_PWMS_MAX)
struct mlxsw_hwmon_attr {
struct device_attribute dev_attr;
@ -106,9 +107,76 @@ static ssize_t mlxsw_hwmon_temp_max_show(struct device *dev,
return sprintf(buf, "%u\n", temp_max);
}
static ssize_t mlxsw_hwmon_fan_rpm_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct mlxsw_hwmon_attr *mlwsw_hwmon_attr =
container_of(attr, struct mlxsw_hwmon_attr, dev_attr);
struct mlxsw_hwmon *mlxsw_hwmon = mlwsw_hwmon_attr->hwmon;
char mfsm_pl[MLXSW_REG_MFSM_LEN];
int err;
mlxsw_reg_mfsm_pack(mfsm_pl, mlwsw_hwmon_attr->type_index);
err = mlxsw_reg_query(mlxsw_hwmon->core, MLXSW_REG(mfsm), mfsm_pl);
if (err) {
dev_err(mlxsw_hwmon->bus_info->dev, "Failed to query fan\n");
return err;
}
return sprintf(buf, "%u\n", mlxsw_reg_mfsm_rpm_get(mfsm_pl));
}
static ssize_t mlxsw_hwmon_pwm_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct mlxsw_hwmon_attr *mlwsw_hwmon_attr =
container_of(attr, struct mlxsw_hwmon_attr, dev_attr);
struct mlxsw_hwmon *mlxsw_hwmon = mlwsw_hwmon_attr->hwmon;
char mfsc_pl[MLXSW_REG_MFSC_LEN];
int err;
mlxsw_reg_mfsc_pack(mfsc_pl, mlwsw_hwmon_attr->type_index, 0);
err = mlxsw_reg_query(mlxsw_hwmon->core, MLXSW_REG(mfsc), mfsc_pl);
if (err) {
dev_err(mlxsw_hwmon->bus_info->dev, "Failed to query PWM\n");
return err;
}
return sprintf(buf, "%u\n",
mlxsw_reg_mfsc_pwm_duty_cycle_get(mfsc_pl));
}
static ssize_t mlxsw_hwmon_pwm_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t len)
{
struct mlxsw_hwmon_attr *mlwsw_hwmon_attr =
container_of(attr, struct mlxsw_hwmon_attr, dev_attr);
struct mlxsw_hwmon *mlxsw_hwmon = mlwsw_hwmon_attr->hwmon;
char mfsc_pl[MLXSW_REG_MFSC_LEN];
unsigned long val;
int err;
err = kstrtoul(buf, 10, &val);
if (err)
return err;
if (val > 255)
return -EINVAL;
mlxsw_reg_mfsc_pack(mfsc_pl, mlwsw_hwmon_attr->type_index, val);
err = mlxsw_reg_write(mlxsw_hwmon->core, MLXSW_REG(mfsc), mfsc_pl);
if (err) {
dev_err(mlxsw_hwmon->bus_info->dev, "Failed to write PWM\n");
return err;
}
return err ? err : len;
}
enum mlxsw_hwmon_attr_type {
MLXSW_HWMON_ATTR_TYPE_TEMP,
MLXSW_HWMON_ATTR_TYPE_TEMP_MAX,
MLXSW_HWMON_ATTR_TYPE_FAN_RPM,
MLXSW_HWMON_ATTR_TYPE_PWM,
};
static void mlxsw_hwmon_attr_add(struct mlxsw_hwmon *mlxsw_hwmon,
@ -133,6 +201,19 @@ static void mlxsw_hwmon_attr_add(struct mlxsw_hwmon *mlxsw_hwmon,
snprintf(mlxsw_hwmon_attr->name, sizeof(mlxsw_hwmon_attr->name),
"temp%u_highest", num + 1);
break;
case MLXSW_HWMON_ATTR_TYPE_FAN_RPM:
mlxsw_hwmon_attr->dev_attr.show = mlxsw_hwmon_fan_rpm_show;
mlxsw_hwmon_attr->dev_attr.attr.mode = S_IRUGO;
snprintf(mlxsw_hwmon_attr->name, sizeof(mlxsw_hwmon_attr->name),
"fan%u_input", num + 1);
break;
case MLXSW_HWMON_ATTR_TYPE_PWM:
mlxsw_hwmon_attr->dev_attr.show = mlxsw_hwmon_pwm_show;
mlxsw_hwmon_attr->dev_attr.store = mlxsw_hwmon_pwm_store;
mlxsw_hwmon_attr->dev_attr.attr.mode = S_IWUSR | S_IRUGO;
snprintf(mlxsw_hwmon_attr->name, sizeof(mlxsw_hwmon_attr->name),
"pwm%u", num + 1);
break;
default:
BUG();
}
@ -177,6 +258,39 @@ static int mlxsw_hwmon_temp_init(struct mlxsw_hwmon *mlxsw_hwmon)
return 0;
}
static int mlxsw_hwmon_fans_init(struct mlxsw_hwmon *mlxsw_hwmon)
{
char mfcr_pl[MLXSW_REG_MFCR_LEN];
enum mlxsw_reg_mfcr_pwm_frequency freq;
unsigned int type_index;
unsigned int num;
u16 tacho_active;
u8 pwm_active;
int err;
err = mlxsw_reg_query(mlxsw_hwmon->core, MLXSW_REG(mfcr), mfcr_pl);
if (err) {
dev_err(mlxsw_hwmon->bus_info->dev, "Failed to get to probe PWMs and Tachometers\n");
return err;
}
mlxsw_reg_mfcr_unpack(mfcr_pl, &freq, &tacho_active, &pwm_active);
num = 0;
for (type_index = 0; type_index < MLXSW_MFCR_TACHOS_MAX; type_index++) {
if (tacho_active & BIT(type_index))
mlxsw_hwmon_attr_add(mlxsw_hwmon,
MLXSW_HWMON_ATTR_TYPE_FAN_RPM,
type_index, num++);
}
num = 0;
for (type_index = 0; type_index < MLXSW_MFCR_PWMS_MAX; type_index++) {
if (pwm_active & BIT(type_index))
mlxsw_hwmon_attr_add(mlxsw_hwmon,
MLXSW_HWMON_ATTR_TYPE_PWM,
type_index, num++);
}
return 0;
}
int mlxsw_hwmon_init(struct mlxsw_core *mlxsw_core,
const struct mlxsw_bus_info *mlxsw_bus_info,
struct mlxsw_hwmon **p_hwmon)
@ -195,6 +309,10 @@ int mlxsw_hwmon_init(struct mlxsw_core *mlxsw_core,
if (err)
goto err_temp_init;
err = mlxsw_hwmon_fans_init(mlxsw_hwmon);
if (err)
goto err_fans_init;
mlxsw_hwmon->groups[0] = &mlxsw_hwmon->group;
mlxsw_hwmon->group.attrs = mlxsw_hwmon->attrs;
@ -212,6 +330,7 @@ int mlxsw_hwmon_init(struct mlxsw_core *mlxsw_core,
return 0;
err_hwmon_register:
err_fans_init:
err_temp_init:
kfree(mlxsw_hwmon);
return err;