diff options
Diffstat (limited to 'drivers/hwmon/pwm-fan.c')
| -rw-r--r-- | drivers/hwmon/pwm-fan.c | 26 |
1 files changed, 11 insertions, 15 deletions
diff --git a/drivers/hwmon/pwm-fan.c b/drivers/hwmon/pwm-fan.c index 17bb64299bfd..1f63807c0399 100644 --- a/drivers/hwmon/pwm-fan.c +++ b/drivers/hwmon/pwm-fan.c @@ -54,16 +54,18 @@ static irqreturn_t pulse_handler(int irq, void *dev_id) 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; - u64 tmp; - pulses = atomic_read(&ctx->pulses); - atomic_sub(pulses, &ctx->pulses); - tmp = (u64)pulses * ktime_ms_delta(ktime_get(), ctx->sample_start) * 60; - do_div(tmp, ctx->pulses_per_revolution * 1000); - ctx->rpm = tmp; + if (delta) { + pulses = atomic_read(&ctx->pulses); + atomic_sub(pulses, &ctx->pulses); + ctx->rpm = (unsigned int)(pulses * 1000 * 60) / + (ctx->pulses_per_revolution * delta); + + ctx->sample_start = ktime_get(); + } - ctx->sample_start = ktime_get(); mod_timer(&ctx->rpm_timer, jiffies + HZ); } @@ -293,14 +295,8 @@ static int pwm_fan_probe(struct platform_device *pdev) mutex_init(&ctx->lock); ctx->pwm = devm_of_pwm_get(dev, dev->of_node, NULL); - if (IS_ERR(ctx->pwm)) { - ret = PTR_ERR(ctx->pwm); - - if (ret != -EPROBE_DEFER) - dev_err(dev, "Could not get PWM: %d\n", ret); - - return ret; - } + if (IS_ERR(ctx->pwm)) + return dev_err_probe(dev, PTR_ERR(ctx->pwm), "Could not get PWM\n"); platform_set_drvdata(pdev, ctx); |