@@ -23,6 +23,8 @@
#include <linux/kdev_t.h>
#include <linux/pwm.h>
+static int capture_channel;
+
struct pwm_export {
struct device child;
struct pwm_device *pwm;
@@ -167,16 +169,42 @@ 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);
+
+ return pwm_capture(pwm, capture_channel, buf);
+}
+
+static ssize_t capture_store(struct device *child,
+ struct device_attribute *attr,
+ const char *buf, size_t size)
+{
+ int val, ret;
+
+ ret = kstrtoint(buf, 0, &val);
+ if (ret)
+ return ret;
+
+ capture_channel = val;
+
+ return size;
+}
+
static DEVICE_ATTR_RW(period);
static DEVICE_ATTR_RW(duty_cycle);
static DEVICE_ATTR_RW(enable);
static DEVICE_ATTR_RW(polarity);
+static DEVICE_ATTR_RW(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);
Allow a user to read PWM Capture results from /sysfs. First, the user must tell PWM Capture which channel they wish to read from: $ echo 2 > $PWMCHIP/capture To start a capture and read the result, simply read the file: $ cat $PWMCHIP/capture The output format is left to the device. Signed-off-by: Lee Jones <lee.jones@linaro.org> --- drivers/pwm/sysfs.c | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) -- 1.9.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel