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pwm: sysfs: Add PWM capture support

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Allow a user to read PWM capture results from sysfs. To start a capture
and read the result, simply read the file:

  $ cat $PWMCHIP/capture

The output format is "<period> <duty cycle>".

Signed-off-by: Lee Jones <[email protected]>
Signed-off-by: Thierry Reding <[email protected]>
This commit is contained in:
Lee Jones 2016-06-08 10:21:25 +01:00 • committed by Thierry Reding
commit 1a366fe915
2 changed files with 26 additions and 0 deletions
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17
drivers/pwm/sysfs.c
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@ -208,16 +208,33 @@ static ssize_t polarity_store(struct device *child,
return ret ? : size;
}
static ssize_t capture_show(struct device *child,
struct device_attribute *attr,
char *buf)
{
struct pwm_device *pwm = child_to_pwm_device(child);
struct pwm_capture result;
int ret;
ret = pwm_capture(pwm, &result, jiffies_to_msecs(HZ));
if (ret)
return ret;
return sprintf(buf, "%u %u\n", result.period, result.duty_cycle);
}
static DEVICE_ATTR_RW(period);
static DEVICE_ATTR_RW(duty_cycle);
static DEVICE_ATTR_RW(enable);
static DEVICE_ATTR_RW(polarity);
static DEVICE_ATTR_RO(capture);
static struct attribute *pwm_attrs[] = {
&dev_attr_period.attr,
&dev_attr_duty_cycle.attr,
&dev_attr_enable.attr,
&dev_attr_polarity.attr,
&dev_attr_capture.attr,
NULL
};
ATTRIBUTE_GROUPS(pwm);