|
|
|
|
@ -8,7 +8,6 @@
|
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
#include <linux/hwmon.h>
|
|
|
|
|
#include <linux/hwmon-sysfs.h>
|
|
|
|
|
#include <linux/interrupt.h>
|
|
|
|
|
#include <linux/module.h>
|
|
|
|
|
#include <linux/mutex.h>
|
|
|
|
|
@ -23,20 +22,38 @@
|
|
|
|
|
|
|
|
|
|
#define MAX_PWM 255
|
|
|
|
|
|
|
|
|
|
struct pwm_fan_tach {
|
|
|
|
|
int irq;
|
|
|
|
|
atomic_t pulses;
|
|
|
|
|
unsigned int rpm;
|
|
|
|
|
u8 pulses_per_revolution;
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
enum pwm_fan_enable_mode {
|
|
|
|
|
pwm_off_reg_off,
|
|
|
|
|
pwm_disable_reg_enable,
|
|
|
|
|
pwm_enable_reg_enable,
|
|
|
|
|
pwm_disable_reg_disable,
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
struct thermal_trips {
|
|
|
|
|
int temp;
|
|
|
|
|
int state;
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
struct pwm_fan_ctx {
|
|
|
|
|
struct device *dev;
|
|
|
|
|
|
|
|
|
|
struct mutex lock;
|
|
|
|
|
struct pwm_device *pwm;
|
|
|
|
|
struct pwm_state pwm_state;
|
|
|
|
|
struct regulator *reg_en;
|
|
|
|
|
enum pwm_fan_enable_mode enable_mode;
|
|
|
|
|
bool regulator_enabled;
|
|
|
|
|
bool enabled;
|
|
|
|
|
|
|
|
|
|
int irq;
|
|
|
|
|
atomic_t pulses;
|
|
|
|
|
unsigned int rpm;
|
|
|
|
|
u8 pulses_per_revolution;
|
|
|
|
|
int tach_count;
|
|
|
|
|
struct pwm_fan_tach *tachs;
|
|
|
|
|
ktime_t sample_start;
|
|
|
|
|
struct timer_list rpm_timer;
|
|
|
|
|
|
|
|
|
|
@ -48,14 +65,19 @@ struct pwm_fan_ctx {
|
|
|
|
|
struct notifier_block thermal_nb;
|
|
|
|
|
struct thermal_trips *thermal_trips;
|
|
|
|
|
bool thermal_notifier_is_ok;
|
|
|
|
|
unsigned int delay_ms;
|
|
|
|
|
ktime_t time_in_state;
|
|
|
|
|
|
|
|
|
|
struct hwmon_chip_info info;
|
|
|
|
|
struct hwmon_channel_info fan_channel;
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
/* This handler assumes self resetting edge triggered interrupt. */
|
|
|
|
|
static irqreturn_t pulse_handler(int irq, void *dev_id)
|
|
|
|
|
{
|
|
|
|
|
struct pwm_fan_ctx *ctx = dev_id;
|
|
|
|
|
struct pwm_fan_tach *tach = dev_id;
|
|
|
|
|
|
|
|
|
|
atomic_inc(&ctx->pulses);
|
|
|
|
|
atomic_inc(&tach->pulses);
|
|
|
|
|
|
|
|
|
|
return IRQ_HANDLED;
|
|
|
|
|
}
|
|
|
|
|
@ -64,13 +86,18 @@ static void sample_timer(struct timer_list *t)
|
|
|
|
|
{
|
|
|
|
|
struct pwm_fan_ctx *ctx = from_timer(ctx, t, rpm_timer);
|
|
|
|
|
unsigned int delta = ktime_ms_delta(ktime_get(), ctx->sample_start);
|
|
|
|
|
int pulses;
|
|
|
|
|
int i;
|
|
|
|
|
|
|
|
|
|
if (delta) {
|
|
|
|
|
pulses = atomic_read(&ctx->pulses);
|
|
|
|
|
atomic_sub(pulses, &ctx->pulses);
|
|
|
|
|
ctx->rpm = (unsigned int)(pulses * 1000 * 60) /
|
|
|
|
|
(ctx->pulses_per_revolution * delta);
|
|
|
|
|
for (i = 0; i < ctx->tach_count; i++) {
|
|
|
|
|
struct pwm_fan_tach *tach = &ctx->tachs[i];
|
|
|
|
|
int pulses;
|
|
|
|
|
|
|
|
|
|
pulses = atomic_read(&tach->pulses);
|
|
|
|
|
atomic_sub(pulses, &tach->pulses);
|
|
|
|
|
tach->rpm = (unsigned int)(pulses * 1000 * 60) /
|
|
|
|
|
(tach->pulses_per_revolution * delta);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
ctx->sample_start = ktime_get();
|
|
|
|
|
}
|
|
|
|
|
@ -78,26 +105,140 @@ static void sample_timer(struct timer_list *t)
|
|
|
|
|
mod_timer(&ctx->rpm_timer, jiffies + HZ);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static void pwm_fan_enable_mode_2_state(int enable_mode,
|
|
|
|
|
struct pwm_state *state,
|
|
|
|
|
bool *enable_regulator)
|
|
|
|
|
{
|
|
|
|
|
switch (enable_mode) {
|
|
|
|
|
case pwm_disable_reg_enable:
|
|
|
|
|
/* disable pwm, keep regulator enabled */
|
|
|
|
|
state->enabled = false;
|
|
|
|
|
*enable_regulator = true;
|
|
|
|
|
break;
|
|
|
|
|
case pwm_enable_reg_enable:
|
|
|
|
|
/* keep pwm and regulator enabled */
|
|
|
|
|
state->enabled = true;
|
|
|
|
|
*enable_regulator = true;
|
|
|
|
|
break;
|
|
|
|
|
case pwm_off_reg_off:
|
|
|
|
|
case pwm_disable_reg_disable:
|
|
|
|
|
/* disable pwm and regulator */
|
|
|
|
|
state->enabled = false;
|
|
|
|
|
*enable_regulator = false;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static int pwm_fan_switch_power(struct pwm_fan_ctx *ctx, bool on)
|
|
|
|
|
{
|
|
|
|
|
int ret = 0;
|
|
|
|
|
|
|
|
|
|
if (!ctx->reg_en)
|
|
|
|
|
return ret;
|
|
|
|
|
|
|
|
|
|
if (!ctx->regulator_enabled && on) {
|
|
|
|
|
ret = regulator_enable(ctx->reg_en);
|
|
|
|
|
if (ret == 0)
|
|
|
|
|
ctx->regulator_enabled = true;
|
|
|
|
|
} else if (ctx->regulator_enabled && !on) {
|
|
|
|
|
ret = regulator_disable(ctx->reg_en);
|
|
|
|
|
if (ret == 0)
|
|
|
|
|
ctx->regulator_enabled = false;
|
|
|
|
|
}
|
|
|
|
|
return ret;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static int pwm_fan_power_on(struct pwm_fan_ctx *ctx)
|
|
|
|
|
{
|
|
|
|
|
struct pwm_state *state = &ctx->pwm_state;
|
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
|
|
if (ctx->enabled)
|
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
|
|
ret = pwm_fan_switch_power(ctx, true);
|
|
|
|
|
if (ret < 0) {
|
|
|
|
|
dev_err(ctx->dev, "failed to enable power supply\n");
|
|
|
|
|
return ret;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
state->enabled = true;
|
|
|
|
|
ret = pwm_apply_state(ctx->pwm, state);
|
|
|
|
|
if (ret) {
|
|
|
|
|
dev_err(ctx->dev, "failed to enable PWM\n");
|
|
|
|
|
goto disable_regulator;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
ctx->enabled = true;
|
|
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
|
|
disable_regulator:
|
|
|
|
|
pwm_fan_switch_power(ctx, false);
|
|
|
|
|
return ret;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static int pwm_fan_power_off(struct pwm_fan_ctx *ctx)
|
|
|
|
|
{
|
|
|
|
|
struct pwm_state *state = &ctx->pwm_state;
|
|
|
|
|
bool enable_regulator = false;
|
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
|
|
if (!ctx->enabled)
|
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
|
|
pwm_fan_enable_mode_2_state(ctx->enable_mode,
|
|
|
|
|
state,
|
|
|
|
|
&enable_regulator);
|
|
|
|
|
|
|
|
|
|
state->enabled = false;
|
|
|
|
|
state->duty_cycle = 0;
|
|
|
|
|
ret = pwm_apply_state(ctx->pwm, state);
|
|
|
|
|
if (ret) {
|
|
|
|
|
dev_err(ctx->dev, "failed to disable PWM\n");
|
|
|
|
|
return ret;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
pwm_fan_switch_power(ctx, enable_regulator);
|
|
|
|
|
|
|
|
|
|
ctx->enabled = false;
|
|
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static int __set_pwm(struct pwm_fan_ctx *ctx, unsigned long pwm)
|
|
|
|
|
{
|
|
|
|
|
struct pwm_state *state = &ctx->pwm_state;
|
|
|
|
|
unsigned long period;
|
|
|
|
|
int ret = 0;
|
|
|
|
|
struct pwm_state state = { };
|
|
|
|
|
|
|
|
|
|
mutex_lock(&ctx->lock);
|
|
|
|
|
if (ctx->pwm_value == pwm)
|
|
|
|
|
goto exit_set_pwm_err;
|
|
|
|
|
if (pwm > 0) {
|
|
|
|
|
if (ctx->enable_mode == pwm_off_reg_off)
|
|
|
|
|
/* pwm-fan hard disabled */
|
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
|
|
pwm_init_state(ctx->pwm, &state);
|
|
|
|
|
period = ctx->pwm->args.period;
|
|
|
|
|
state.duty_cycle = DIV_ROUND_UP(pwm * (period - 1), MAX_PWM);
|
|
|
|
|
state.enabled = pwm ? true : false;
|
|
|
|
|
|
|
|
|
|
ret = pwm_apply_state(ctx->pwm, &state);
|
|
|
|
|
period = state->period;
|
|
|
|
|
state->duty_cycle = DIV_ROUND_UP(pwm * (period - 1), MAX_PWM);
|
|
|
|
|
ret = pwm_apply_state(ctx->pwm, state);
|
|
|
|
|
if (ret)
|
|
|
|
|
return ret;
|
|
|
|
|
ret = pwm_fan_power_on(ctx);
|
|
|
|
|
} else {
|
|
|
|
|
ret = pwm_fan_power_off(ctx);
|
|
|
|
|
}
|
|
|
|
|
if (!ret)
|
|
|
|
|
ctx->pwm_value = pwm;
|
|
|
|
|
exit_set_pwm_err:
|
|
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static int set_pwm(struct pwm_fan_ctx *ctx, unsigned long pwm)
|
|
|
|
|
{
|
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
|
|
mutex_lock(&ctx->lock);
|
|
|
|
|
ret = __set_pwm(ctx, pwm);
|
|
|
|
|
mutex_unlock(&ctx->lock);
|
|
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
@ -112,70 +253,127 @@ static void pwm_fan_update_state(struct pwm_fan_ctx *ctx, unsigned long pwm)
|
|
|
|
|
ctx->pwm_fan_state = i;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static ssize_t pwm_store(struct device *dev, struct device_attribute *attr,
|
|
|
|
|
const char *buf, size_t count)
|
|
|
|
|
static int pwm_fan_update_enable(struct pwm_fan_ctx *ctx, long val)
|
|
|
|
|
{
|
|
|
|
|
struct pwm_fan_ctx *ctx = dev_get_drvdata(dev);
|
|
|
|
|
unsigned long pwm;
|
|
|
|
|
int ret;
|
|
|
|
|
int ret = 0;
|
|
|
|
|
int old_val;
|
|
|
|
|
|
|
|
|
|
if (kstrtoul(buf, 10, &pwm) || pwm > MAX_PWM)
|
|
|
|
|
return -EINVAL;
|
|
|
|
|
mutex_lock(&ctx->lock);
|
|
|
|
|
|
|
|
|
|
ret = __set_pwm(ctx, pwm);
|
|
|
|
|
if (ret)
|
|
|
|
|
return ret;
|
|
|
|
|
if (ctx->enable_mode == val)
|
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
|
|
pwm_fan_update_state(ctx, pwm);
|
|
|
|
|
return count;
|
|
|
|
|
}
|
|
|
|
|
old_val = ctx->enable_mode;
|
|
|
|
|
ctx->enable_mode = val;
|
|
|
|
|
|
|
|
|
|
static ssize_t pwm_show(struct device *dev, struct device_attribute *attr,
|
|
|
|
|
char *buf)
|
|
|
|
|
{
|
|
|
|
|
struct pwm_fan_ctx *ctx = dev_get_drvdata(dev);
|
|
|
|
|
if (val == 0) {
|
|
|
|
|
/* Disable pwm-fan unconditionally */
|
|
|
|
|
if (ctx->enabled)
|
|
|
|
|
ret = __set_pwm(ctx, 0);
|
|
|
|
|
else
|
|
|
|
|
ret = pwm_fan_switch_power(ctx, false);
|
|
|
|
|
if (ret)
|
|
|
|
|
ctx->enable_mode = old_val;
|
|
|
|
|
pwm_fan_update_state(ctx, 0);
|
|
|
|
|
} else {
|
|
|
|
|
/*
|
|
|
|
|
* Change PWM and/or regulator state if currently disabled
|
|
|
|
|
* Nothing to do if currently enabled
|
|
|
|
|
*/
|
|
|
|
|
if (!ctx->enabled) {
|
|
|
|
|
struct pwm_state *state = &ctx->pwm_state;
|
|
|
|
|
bool enable_regulator = false;
|
|
|
|
|
|
|
|
|
|
state->duty_cycle = 0;
|
|
|
|
|
pwm_fan_enable_mode_2_state(val,
|
|
|
|
|
state,
|
|
|
|
|
&enable_regulator);
|
|
|
|
|
|
|
|
|
|
pwm_apply_state(ctx->pwm, state);
|
|
|
|
|
pwm_fan_switch_power(ctx, enable_regulator);
|
|
|
|
|
pwm_fan_update_state(ctx, 0);
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
out:
|
|
|
|
|
mutex_unlock(&ctx->lock);
|
|
|
|
|
|
|
|
|
|
return sprintf(buf, "%u\n", ctx->pwm_value);
|
|
|
|
|
return ret;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static ssize_t rpm_show(struct device *dev,
|
|
|
|
|
struct device_attribute *attr, char *buf)
|
|
|
|
|
static int pwm_fan_write(struct device *dev, enum hwmon_sensor_types type,
|
|
|
|
|
u32 attr, int channel, long val)
|
|
|
|
|
{
|
|
|
|
|
struct pwm_fan_ctx *ctx = dev_get_drvdata(dev);
|
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
|
|
return sprintf(buf, "%u\n", ctx->rpm);
|
|
|
|
|
}
|
|
|
|
|
switch (attr) {
|
|
|
|
|
case hwmon_pwm_input:
|
|
|
|
|
if (val < 0 || val > MAX_PWM)
|
|
|
|
|
return -EINVAL;
|
|
|
|
|
ret = set_pwm(ctx, val);
|
|
|
|
|
if (ret)
|
|
|
|
|
return ret;
|
|
|
|
|
pwm_fan_update_state(ctx, val);
|
|
|
|
|
break;
|
|
|
|
|
case hwmon_pwm_enable:
|
|
|
|
|
if (val < 0 || val > 3)
|
|
|
|
|
ret = -EINVAL;
|
|
|
|
|
else
|
|
|
|
|
ret = pwm_fan_update_enable(ctx, val);
|
|
|
|
|
|
|
|
|
|
static SENSOR_DEVICE_ATTR_RW(pwm1, pwm, 0);
|
|
|
|
|
static SENSOR_DEVICE_ATTR_RO(fan1_input, rpm, 0);
|
|
|
|
|
return ret;
|
|
|
|
|
default:
|
|
|
|
|
return -EOPNOTSUPP;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static struct attribute *pwm_fan_attrs[] = {
|
|
|
|
|
&sensor_dev_attr_pwm1.dev_attr.attr,
|
|
|
|
|
&sensor_dev_attr_fan1_input.dev_attr.attr,
|
|
|
|
|
NULL,
|
|
|
|
|
};
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static umode_t pwm_fan_attrs_visible(struct kobject *kobj, struct attribute *a,
|
|
|
|
|
int n)
|
|
|
|
|
static int pwm_fan_read(struct device *dev, enum hwmon_sensor_types type,
|
|
|
|
|
u32 attr, int channel, long *val)
|
|
|
|
|
{
|
|
|
|
|
struct device *dev = container_of(kobj, struct device, kobj);
|
|
|
|
|
struct pwm_fan_ctx *ctx = dev_get_drvdata(dev);
|
|
|
|
|
|
|
|
|
|
/* Hide fan_input in case no interrupt is available */
|
|
|
|
|
if (n == 1 && ctx->irq <= 0)
|
|
|
|
|
switch (type) {
|
|
|
|
|
case hwmon_pwm:
|
|
|
|
|
switch (attr) {
|
|
|
|
|
case hwmon_pwm_input:
|
|
|
|
|
*val = ctx->pwm_value;
|
|
|
|
|
return 0;
|
|
|
|
|
case hwmon_pwm_enable:
|
|
|
|
|
*val = ctx->enable_mode;
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
return -EOPNOTSUPP;
|
|
|
|
|
case hwmon_fan:
|
|
|
|
|
*val = ctx->tachs[channel].rpm;
|
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
|
|
return a->mode;
|
|
|
|
|
default:
|
|
|
|
|
return -ENOTSUPP;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static const struct attribute_group pwm_fan_group = {
|
|
|
|
|
.attrs = pwm_fan_attrs,
|
|
|
|
|
.is_visible = pwm_fan_attrs_visible,
|
|
|
|
|
};
|
|
|
|
|
static umode_t pwm_fan_is_visible(const void *data,
|
|
|
|
|
enum hwmon_sensor_types type,
|
|
|
|
|
u32 attr, int channel)
|
|
|
|
|
{
|
|
|
|
|
switch (type) {
|
|
|
|
|
case hwmon_pwm:
|
|
|
|
|
return 0644;
|
|
|
|
|
|
|
|
|
|
static const struct attribute_group *pwm_fan_groups[] = {
|
|
|
|
|
&pwm_fan_group,
|
|
|
|
|
NULL,
|
|
|
|
|
case hwmon_fan:
|
|
|
|
|
return 0444;
|
|
|
|
|
|
|
|
|
|
default:
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static const struct hwmon_ops pwm_fan_hwmon_ops = {
|
|
|
|
|
.is_visible = pwm_fan_is_visible,
|
|
|
|
|
.read = pwm_fan_read,
|
|
|
|
|
.write = pwm_fan_write,
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
/* thermal cooling device callbacks */
|
|
|
|
|
@ -214,10 +412,14 @@ pwm_fan_set_cur_state(struct thermal_cooling_device *cdev, unsigned long state)
|
|
|
|
|
if (!ctx || (state > ctx->pwm_fan_max_state))
|
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
|
|
/* keep running after user request */
|
|
|
|
|
if (ctx->delay_ms > 0)
|
|
|
|
|
ctx->time_in_state = ktime_add_ms(ktime_get(), ctx->delay_ms);
|
|
|
|
|
|
|
|
|
|
if (state == ctx->pwm_fan_state)
|
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
|
|
ret = __set_pwm(ctx, ctx->pwm_fan_cooling_levels[state]);
|
|
|
|
|
ret = set_pwm(ctx, ctx->pwm_fan_cooling_levels[state]);
|
|
|
|
|
if (ret) {
|
|
|
|
|
dev_err(&cdev->device, "Cannot set pwm!\n");
|
|
|
|
|
return ret;
|
|
|
|
|
@ -275,16 +477,14 @@ static int pwm_fan_of_get_cooling_data(struct device *dev,
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static void pwm_fan_regulator_disable(void *data)
|
|
|
|
|
{
|
|
|
|
|
regulator_disable(data);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static void pwm_fan_pwm_disable(void *__ctx)
|
|
|
|
|
static void pwm_fan_cleanup(void *__ctx)
|
|
|
|
|
{
|
|
|
|
|
struct pwm_fan_ctx *ctx = __ctx;
|
|
|
|
|
pwm_disable(ctx->pwm);
|
|
|
|
|
|
|
|
|
|
del_timer_sync(&ctx->rpm_timer);
|
|
|
|
|
/* Switch off everything */
|
|
|
|
|
ctx->enable_mode = pwm_disable_reg_disable;
|
|
|
|
|
pwm_fan_power_off(ctx);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static int pwm_fan_get_thermal_trips(struct device *dev, char *porp_name,
|
|
|
|
|
@ -354,7 +554,12 @@ static int pwm_fan_thermal_notifier_call(struct notifier_block *nb,
|
|
|
|
|
if (state == ctx->pwm_fan_state)
|
|
|
|
|
return NOTIFY_OK;
|
|
|
|
|
|
|
|
|
|
ret = __set_pwm(ctx, ctx->pwm_fan_cooling_levels[state]);
|
|
|
|
|
if (ktime_before(ktime_get(), ctx->time_in_state) &&
|
|
|
|
|
state < ctx->pwm_fan_max_state) {
|
|
|
|
|
return NOTIFY_DONE;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
ret = set_pwm(ctx, ctx->pwm_fan_cooling_levels[state]);
|
|
|
|
|
if (ret)
|
|
|
|
|
return NOTIFY_BAD;
|
|
|
|
|
|
|
|
|
|
@ -382,8 +587,10 @@ static int pwm_fan_probe(struct platform_device *pdev)
|
|
|
|
|
struct pwm_fan_ctx *ctx;
|
|
|
|
|
struct device *hwmon;
|
|
|
|
|
int ret;
|
|
|
|
|
struct pwm_state state = { };
|
|
|
|
|
u32 ppr = 2;
|
|
|
|
|
const struct hwmon_channel_info **channels;
|
|
|
|
|
u32 *fan_channel_config;
|
|
|
|
|
int channel_count = 1; /* We always have a PWM channel. */
|
|
|
|
|
int i;
|
|
|
|
|
|
|
|
|
|
ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
|
|
|
|
|
if (!ctx)
|
|
|
|
|
@ -391,81 +598,125 @@ static int pwm_fan_probe(struct platform_device *pdev)
|
|
|
|
|
|
|
|
|
|
mutex_init(&ctx->lock);
|
|
|
|
|
|
|
|
|
|
ctx->pwm = devm_of_pwm_get(dev, dev->of_node, NULL);
|
|
|
|
|
ctx->dev = &pdev->dev;
|
|
|
|
|
ctx->pwm = devm_pwm_get(dev, NULL);
|
|
|
|
|
if (IS_ERR(ctx->pwm))
|
|
|
|
|
return dev_err_probe(dev, PTR_ERR(ctx->pwm), "Could not get PWM\n");
|
|
|
|
|
|
|
|
|
|
platform_set_drvdata(pdev, ctx);
|
|
|
|
|
|
|
|
|
|
ctx->irq = platform_get_irq_optional(pdev, 0);
|
|
|
|
|
if (ctx->irq == -EPROBE_DEFER)
|
|
|
|
|
return ctx->irq;
|
|
|
|
|
|
|
|
|
|
ctx->reg_en = devm_regulator_get_optional(dev, "fan");
|
|
|
|
|
if (IS_ERR(ctx->reg_en)) {
|
|
|
|
|
if (PTR_ERR(ctx->reg_en) != -ENODEV)
|
|
|
|
|
return PTR_ERR(ctx->reg_en);
|
|
|
|
|
|
|
|
|
|
ctx->reg_en = NULL;
|
|
|
|
|
} else {
|
|
|
|
|
ret = regulator_enable(ctx->reg_en);
|
|
|
|
|
if (ret) {
|
|
|
|
|
dev_err(dev, "Failed to enable fan supply: %d\n", ret);
|
|
|
|
|
return ret;
|
|
|
|
|
}
|
|
|
|
|
ret = devm_add_action_or_reset(dev, pwm_fan_regulator_disable,
|
|
|
|
|
ctx->reg_en);
|
|
|
|
|
if (ret)
|
|
|
|
|
return ret;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
ctx->pwm_value = MAX_PWM;
|
|
|
|
|
pwm_init_state(ctx->pwm, &ctx->pwm_state);
|
|
|
|
|
|
|
|
|
|
pwm_init_state(ctx->pwm, &state);
|
|
|
|
|
/*
|
|
|
|
|
* __set_pwm assumes that MAX_PWM * (period - 1) fits into an unsigned
|
|
|
|
|
* set_pwm assumes that MAX_PWM * (period - 1) fits into an unsigned
|
|
|
|
|
* long. Check this here to prevent the fan running at a too low
|
|
|
|
|
* frequency.
|
|
|
|
|
*/
|
|
|
|
|
if (state.period > ULONG_MAX / MAX_PWM + 1) {
|
|
|
|
|
if (ctx->pwm_state.period > ULONG_MAX / MAX_PWM + 1) {
|
|
|
|
|
dev_err(dev, "Configured period too big\n");
|
|
|
|
|
return -EINVAL;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Set duty cycle to maximum allowed and enable PWM output */
|
|
|
|
|
state.duty_cycle = ctx->pwm->args.period - 1;
|
|
|
|
|
state.enabled = true;
|
|
|
|
|
ctx->enable_mode = pwm_disable_reg_enable;
|
|
|
|
|
|
|
|
|
|
ret = pwm_apply_state(ctx->pwm, &state);
|
|
|
|
|
/*
|
|
|
|
|
* Set duty cycle to maximum allowed and enable PWM output as well as
|
|
|
|
|
* the regulator. In case of error nothing is changed
|
|
|
|
|
*/
|
|
|
|
|
ret = set_pwm(ctx, MAX_PWM);
|
|
|
|
|
if (ret) {
|
|
|
|
|
dev_err(dev, "Failed to configure PWM: %d\n", ret);
|
|
|
|
|
return ret;
|
|
|
|
|
}
|
|
|
|
|
timer_setup(&ctx->rpm_timer, sample_timer, 0);
|
|
|
|
|
ret = devm_add_action_or_reset(dev, pwm_fan_pwm_disable, ctx);
|
|
|
|
|
ret = devm_add_action_or_reset(dev, pwm_fan_cleanup, ctx);
|
|
|
|
|
if (ret)
|
|
|
|
|
return ret;
|
|
|
|
|
|
|
|
|
|
of_property_read_u32(dev->of_node, "pulses-per-revolution", &ppr);
|
|
|
|
|
ctx->pulses_per_revolution = ppr;
|
|
|
|
|
if (!ctx->pulses_per_revolution) {
|
|
|
|
|
dev_err(dev, "pulses-per-revolution can't be zero.\n");
|
|
|
|
|
return -EINVAL;
|
|
|
|
|
ctx->tach_count = platform_irq_count(pdev);
|
|
|
|
|
if (ctx->tach_count < 0)
|
|
|
|
|
return dev_err_probe(dev, ctx->tach_count,
|
|
|
|
|
"Could not get number of fan tachometer inputs\n");
|
|
|
|
|
dev_dbg(dev, "%d fan tachometer inputs\n", ctx->tach_count);
|
|
|
|
|
|
|
|
|
|
if (ctx->tach_count) {
|
|
|
|
|
channel_count++; /* We also have a FAN channel. */
|
|
|
|
|
|
|
|
|
|
ctx->tachs = devm_kcalloc(dev, ctx->tach_count,
|
|
|
|
|
sizeof(struct pwm_fan_tach),
|
|
|
|
|
GFP_KERNEL);
|
|
|
|
|
if (!ctx->tachs)
|
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
|
|
ctx->fan_channel.type = hwmon_fan;
|
|
|
|
|
fan_channel_config = devm_kcalloc(dev, ctx->tach_count + 1,
|
|
|
|
|
sizeof(u32), GFP_KERNEL);
|
|
|
|
|
if (!fan_channel_config)
|
|
|
|
|
return -ENOMEM;
|
|
|
|
|
ctx->fan_channel.config = fan_channel_config;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (ctx->irq > 0) {
|
|
|
|
|
ret = devm_request_irq(dev, ctx->irq, pulse_handler, 0,
|
|
|
|
|
pdev->name, ctx);
|
|
|
|
|
if (ret) {
|
|
|
|
|
dev_err(dev, "Failed to request interrupt: %d\n", ret);
|
|
|
|
|
return ret;
|
|
|
|
|
channels = devm_kcalloc(dev, channel_count + 1,
|
|
|
|
|
sizeof(struct hwmon_channel_info *), GFP_KERNEL);
|
|
|
|
|
if (!channels)
|
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
|
|
channels[0] = HWMON_CHANNEL_INFO(pwm, HWMON_PWM_INPUT | HWMON_PWM_ENABLE);
|
|
|
|
|
|
|
|
|
|
for (i = 0; i < ctx->tach_count; i++) {
|
|
|
|
|
struct pwm_fan_tach *tach = &ctx->tachs[i];
|
|
|
|
|
u32 ppr = 2;
|
|
|
|
|
|
|
|
|
|
tach->irq = platform_get_irq(pdev, i);
|
|
|
|
|
if (tach->irq == -EPROBE_DEFER)
|
|
|
|
|
return tach->irq;
|
|
|
|
|
if (tach->irq > 0) {
|
|
|
|
|
ret = devm_request_irq(dev, tach->irq, pulse_handler, 0,
|
|
|
|
|
pdev->name, tach);
|
|
|
|
|
if (ret) {
|
|
|
|
|
dev_err(dev,
|
|
|
|
|
"Failed to request interrupt: %d\n",
|
|
|
|
|
ret);
|
|
|
|
|
return ret;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
of_property_read_u32_index(dev->of_node,
|
|
|
|
|
"pulses-per-revolution",
|
|
|
|
|
i,
|
|
|
|
|
&ppr);
|
|
|
|
|
tach->pulses_per_revolution = ppr;
|
|
|
|
|
if (!tach->pulses_per_revolution) {
|
|
|
|
|
dev_err(dev, "pulses-per-revolution can't be zero.\n");
|
|
|
|
|
return -EINVAL;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
fan_channel_config[i] = HWMON_F_INPUT;
|
|
|
|
|
|
|
|
|
|
dev_dbg(dev, "tach%d: irq=%d, pulses_per_revolution=%d\n",
|
|
|
|
|
i, tach->irq, tach->pulses_per_revolution);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (ctx->tach_count > 0) {
|
|
|
|
|
ctx->sample_start = ktime_get();
|
|
|
|
|
mod_timer(&ctx->rpm_timer, jiffies + HZ);
|
|
|
|
|
|
|
|
|
|
channels[1] = &ctx->fan_channel;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
hwmon = devm_hwmon_device_register_with_groups(dev, "pwmfan",
|
|
|
|
|
ctx, pwm_fan_groups);
|
|
|
|
|
ctx->info.ops = &pwm_fan_hwmon_ops;
|
|
|
|
|
ctx->info.info = channels;
|
|
|
|
|
|
|
|
|
|
hwmon = devm_hwmon_device_register_with_info(dev, "pwmfan",
|
|
|
|
|
ctx, &ctx->info, NULL);
|
|
|
|
|
if (IS_ERR(hwmon)) {
|
|
|
|
|
dev_err(dev, "Failed to register hwmon device\n");
|
|
|
|
|
return PTR_ERR(hwmon);
|
|
|
|
|
@ -481,9 +732,12 @@ static int pwm_fan_probe(struct platform_device *pdev)
|
|
|
|
|
ret = pwm_fan_register_thermal_notifier(dev, ctx);
|
|
|
|
|
if (ret)
|
|
|
|
|
dev_err(dev, "Failed to register thermal notifier: %d\n", ret);
|
|
|
|
|
else
|
|
|
|
|
else {
|
|
|
|
|
device_property_read_u32(dev, "rockchip,hold-time-ms", &ctx->delay_ms);
|
|
|
|
|
/* keep running at 1000ms on startup */
|
|
|
|
|
ctx->time_in_state = ktime_add_ms(ktime_get(), ctx->delay_ms + 1000);
|
|
|
|
|
ctx->thermal_notifier_is_ok = true;
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
if (IS_ENABLED(CONFIG_THERMAL)) {
|
|
|
|
|
cdev = devm_thermal_of_cooling_device_register(dev,
|
|
|
|
|
@ -496,78 +750,49 @@ static int pwm_fan_probe(struct platform_device *pdev)
|
|
|
|
|
return ret;
|
|
|
|
|
}
|
|
|
|
|
ctx->cdev = cdev;
|
|
|
|
|
thermal_cdev_update(cdev);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static int pwm_fan_disable(struct device *dev)
|
|
|
|
|
static int pwm_fan_remove(struct platform_device *pdev)
|
|
|
|
|
{
|
|
|
|
|
struct pwm_fan_ctx *ctx = dev_get_drvdata(dev);
|
|
|
|
|
struct pwm_args args;
|
|
|
|
|
int ret;
|
|
|
|
|
struct pwm_fan_ctx *ctx = platform_get_drvdata(pdev);
|
|
|
|
|
|
|
|
|
|
pwm_get_args(ctx->pwm, &args);
|
|
|
|
|
|
|
|
|
|
if (ctx->pwm_value || ctx->thermal_notifier_is_ok) {
|
|
|
|
|
ret = pwm_config(ctx->pwm, 0, args.period);
|
|
|
|
|
if (ret < 0)
|
|
|
|
|
return ret;
|
|
|
|
|
|
|
|
|
|
pwm_disable(ctx->pwm);
|
|
|
|
|
if (ctx->thermal_notifier_is_ok) {
|
|
|
|
|
ctx->thermal_notifier_is_ok = false;
|
|
|
|
|
rockchip_system_monitor_unregister_notifier(&ctx->thermal_nb);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (ctx->reg_en) {
|
|
|
|
|
ret = regulator_disable(ctx->reg_en);
|
|
|
|
|
if (ret) {
|
|
|
|
|
dev_err(dev, "Failed to disable fan supply: %d\n", ret);
|
|
|
|
|
return ret;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
pwm_fan_switch_power(ctx, false);
|
|
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static void pwm_fan_shutdown(struct platform_device *pdev)
|
|
|
|
|
{
|
|
|
|
|
pwm_fan_disable(&pdev->dev);
|
|
|
|
|
struct pwm_fan_ctx *ctx = platform_get_drvdata(pdev);
|
|
|
|
|
|
|
|
|
|
pwm_fan_cleanup(ctx);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
|
|
|
static int pwm_fan_suspend(struct device *dev)
|
|
|
|
|
{
|
|
|
|
|
return pwm_fan_disable(dev);
|
|
|
|
|
struct pwm_fan_ctx *ctx = dev_get_drvdata(dev);
|
|
|
|
|
|
|
|
|
|
return pwm_fan_power_off(ctx);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static int pwm_fan_resume(struct device *dev)
|
|
|
|
|
{
|
|
|
|
|
struct pwm_fan_ctx *ctx = dev_get_drvdata(dev);
|
|
|
|
|
struct pwm_args pargs;
|
|
|
|
|
unsigned long duty;
|
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
|
|
if (ctx->reg_en) {
|
|
|
|
|
ret = regulator_enable(ctx->reg_en);
|
|
|
|
|
if (ret) {
|
|
|
|
|
dev_err(dev, "Failed to enable fan supply: %d\n", ret);
|
|
|
|
|
return ret;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (ctx->pwm_value == 0 && !ctx->thermal_notifier_is_ok)
|
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
|
|
pwm_get_args(ctx->pwm, &pargs);
|
|
|
|
|
duty = DIV_ROUND_UP_ULL(ctx->pwm_value * (pargs.period - 1), MAX_PWM);
|
|
|
|
|
ret = pwm_config(ctx->pwm, duty, pargs.period);
|
|
|
|
|
if (ret)
|
|
|
|
|
return ret;
|
|
|
|
|
return pwm_enable(ctx->pwm);
|
|
|
|
|
return set_pwm(ctx, ctx->pwm_value);
|
|
|
|
|
}
|
|
|
|
|
#endif
|
|
|
|
|
|
|
|
|
|
static SIMPLE_DEV_PM_OPS(pwm_fan_pm, pwm_fan_suspend, pwm_fan_resume);
|
|
|
|
|
static const struct dev_pm_ops pwm_fan_pm = {
|
|
|
|
|
SET_SYSTEM_SLEEP_PM_OPS(pwm_fan_suspend, pwm_fan_resume)
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
static const struct of_device_id of_pwm_fan_match[] = {
|
|
|
|
|
{ .compatible = "pwm-fan", },
|
|
|
|
|
@ -577,6 +802,7 @@ MODULE_DEVICE_TABLE(of, of_pwm_fan_match);
|
|
|
|
|
|
|
|
|
|
static struct platform_driver pwm_fan_driver = {
|
|
|
|
|
.probe = pwm_fan_probe,
|
|
|
|
|
.remove = pwm_fan_remove,
|
|
|
|
|
.shutdown = pwm_fan_shutdown,
|
|
|
|
|
.driver = {
|
|
|
|
|
.name = "pwm-fan",
|
|
|
|
|
|
hmz007
11 months ago