| Message ID | 1521607244-29734-8-git-send-email-rrajk@nvidia.com |
|---|---|
| State | Deferred |
| Headers | show |
| Series | Implementation of Tegra Tachometer driver | expand |
On 03/20/2018 09:40 PM, Rajkumar Rampelli wrote: > Add fan device attribute fan1_input in pwm-fan driver > to read speed of fan in rotations per minute. > > Signed-off-by: Rajkumar Rampelli <rrajk@nvidia.com> > --- > > V2: Removed generic-pwm-tachometer driver and using pwm-fan driver as per suggestions > to read fan speed. > Added fan device attribute to report speed of fan in rpms through hwmon sysfs. > > drivers/hwmon/pwm-fan.c | 23 +++++++++++++++++++++++ > 1 file changed, 23 insertions(+) > > diff --git a/drivers/hwmon/pwm-fan.c b/drivers/hwmon/pwm-fan.c > index 70cc0d1..8dda209 100644 > --- a/drivers/hwmon/pwm-fan.c > +++ b/drivers/hwmon/pwm-fan.c > @@ -98,11 +98,34 @@ static ssize_t show_pwm(struct device *dev, > return sprintf(buf, "%u\n", ctx->pwm_value); > } > > +static ssize_t show_rpm(struct device *dev, struct device_attribute *attr, > + char *buf) > +{ > + struct pwm_fan_ctx *ptt = dev_get_drvdata(dev); > + struct pwm_device *pwm = ptt->pwm; > + struct pwm_capture result; > + unsigned int rpm = 0; > + int ret; > + > + ret = pwm_capture(pwm, &result, 0); > + if (ret < 0) { > + pr_err("Failed to capture PWM: %d\n", ret); > + return ret; > + } > + > + if (result.period) > + rpm = DIV_ROUND_CLOSEST_ULL(60ULL * NSEC_PER_SEC, > + result.period); > + > + return sprintf(buf, "%u\n", rpm); > +} > > static SENSOR_DEVICE_ATTR(pwm1, S_IRUGO | S_IWUSR, show_pwm, set_pwm, 0); > +static SENSOR_DEVICE_ATTR(fan1_input, 0444, show_rpm, NULL, 0); > > static struct attribute *pwm_fan_attrs[] = { > &sensor_dev_attr_pwm1.dev_attr.attr, > + &sensor_dev_attr_fan1_input.dev_attr.attr, This doesn't make sense. The same pwm can not both control the fan speed and report it. Guenter > NULL, > }; > > -- To unsubscribe from this list: send the line "unsubscribe linux-tegra" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/drivers/hwmon/pwm-fan.c b/drivers/hwmon/pwm-fan.c index 70cc0d1..8dda209 100644 --- a/drivers/hwmon/pwm-fan.c +++ b/drivers/hwmon/pwm-fan.c @@ -98,11 +98,34 @@ static ssize_t show_pwm(struct device *dev, return sprintf(buf, "%u\n", ctx->pwm_value); } +static ssize_t show_rpm(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct pwm_fan_ctx *ptt = dev_get_drvdata(dev); + struct pwm_device *pwm = ptt->pwm; + struct pwm_capture result; + unsigned int rpm = 0; + int ret; + + ret = pwm_capture(pwm, &result, 0); + if (ret < 0) { + pr_err("Failed to capture PWM: %d\n", ret); + return ret; + } + + if (result.period) + rpm = DIV_ROUND_CLOSEST_ULL(60ULL * NSEC_PER_SEC, + result.period); + + return sprintf(buf, "%u\n", rpm); +} static SENSOR_DEVICE_ATTR(pwm1, S_IRUGO | S_IWUSR, show_pwm, set_pwm, 0); +static SENSOR_DEVICE_ATTR(fan1_input, 0444, show_rpm, NULL, 0); static struct attribute *pwm_fan_attrs[] = { &sensor_dev_attr_pwm1.dev_attr.attr, + &sensor_dev_attr_fan1_input.dev_attr.attr, NULL, };
Add fan device attribute fan1_input in pwm-fan driver to read speed of fan in rotations per minute. Signed-off-by: Rajkumar Rampelli <rrajk@nvidia.com> --- V2: Removed generic-pwm-tachometer driver and using pwm-fan driver as per suggestions to read fan speed. Added fan device attribute to report speed of fan in rpms through hwmon sysfs. drivers/hwmon/pwm-fan.c | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+)