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pwm: sysfs: Add PWM oneshot mode support

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Allow a user to write pwm oneshot_count value. If oneshot_count == 0,
the pwm works in continuous mode. If 0 < oneshot_count < 256, the
pwm works in oneshot mode.

Signed-off-by: Steven Liu <steven.liu@rock-chips.com>
Change-Id: Icbcea85dc1d625a4ac24fee4ab07f1e2421bde77
This commit is contained in:
Steven Liu
2020-10-22 10:34:39 +08:00
committed by Tao Huang
parent ea419b14d6
commit c945c9dcda
1 changed files with 43 additions and 0 deletions
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43
drivers/pwm/sysfs.c
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@@ -103,6 +103,43 @@ static ssize_t duty_cycle_store(struct device *child,
return ret ? : size;
}
#ifdef CONFIG_PWM_ROCKCHIP_ONESHOT
static ssize_t oneshot_count_show(struct device *child,
struct device_attribute *attr,
char *buf)
{
const struct pwm_device *pwm = child_to_pwm_device(child);
struct pwm_state state;
pwm_get_state(pwm, &state);
return sprintf(buf, "%llu\n", state.oneshot_count);
}
static ssize_t oneshot_count_store(struct device *child,
struct device_attribute *attr,
const char *buf, size_t size)
{
struct pwm_export *export = child_to_pwm_export(child);
struct pwm_device *pwm = export->pwm;
struct pwm_state state;
unsigned int val;
int ret;
ret = kstrtouint(buf, 0, &val);
if (ret)
return ret;
mutex_lock(&export->lock);
pwm_get_state(pwm, &state);
state.oneshot_count = val;
ret = pwm_apply_state(pwm, &state);
mutex_unlock(&export->lock);
return ret ? : size;
}
#endif
static ssize_t enable_show(struct device *child,
struct device_attribute *attr,
char *buf)
@@ -240,6 +277,9 @@ static ssize_t output_type_show(struct device *child,
static DEVICE_ATTR_RW(period);
static DEVICE_ATTR_RW(duty_cycle);
#ifdef CONFIG_PWM_ROCKCHIP_ONESHOT
static DEVICE_ATTR_RW(oneshot_count);
#endif
static DEVICE_ATTR_RW(enable);
static DEVICE_ATTR_RW(polarity);
static DEVICE_ATTR_RO(capture);
@@ -248,6 +288,9 @@ static DEVICE_ATTR_RO(output_type);
static struct attribute *pwm_attrs[] = {
&dev_attr_period.attr,
&dev_attr_duty_cycle.attr,
#ifdef CONFIG_PWM_ROCKCHIP_ONESHOT
&dev_attr_oneshot_count.attr,
#endif
&dev_attr_enable.attr,
&dev_attr_polarity.attr,
&dev_attr_capture.attr,