[PATCH 1/1] pwm: Convert period and duty cycle to u64

Guru Das Srinagesh
2019-10-16T02:11:49Z

Because period and duty cycle are defined as ints with units of
nanoseconds, the maximum time duration that can be set is limited to
~2.147 seconds. Change their definitions to u64 so that higher durations
may be set.

Signed-off-by: Guru Das Srinagesh <gurus@codeaurora.org>
---
drivers/pwm/core.c | 4 ++--
drivers/pwm/sysfs.c | 10 +++++-----
include/linux/pwm.h | 16 ++++++++--------
3 files changed, 15 insertions(+), 15 deletions(-)

diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c
index 6ad51aa..dc79c03 100644
--- a/drivers/pwm/core.c
+++ b/drivers/pwm/core.c
@@ -1163,8 +1163,8 @@ static void pwm_dbg_show(struct pwm_chip *chip, struct seq_file *s)
if (state.enabled)
seq_puts(s, " enabled");

- seq_printf(s, " period: %u ns", state.period);
- seq_printf(s, " duty: %u ns", state.duty_cycle);
+ seq_printf(s, " period: %llu ns", state.period);
+ seq_printf(s, " duty: %llu ns", state.duty_cycle);
seq_printf(s, " polarity: %s",
state.polarity ? "inverse" : "normal");

diff --git a/drivers/pwm/sysfs.c b/drivers/pwm/sysfs.c
index 2389b86..3fb1610 100644
--- a/drivers/pwm/sysfs.c
+++ b/drivers/pwm/sysfs.c
@@ -42,7 +42,7 @@ static ssize_t period_show(struct device *child,

pwm_get_state(pwm, &state);

- return sprintf(buf, "%u\n", state.period);
+ return sprintf(buf, "%llu\n", state.period);
}

static ssize_t period_store(struct device *child,
@@ -52,10 +52,10 @@ static ssize_t period_store(struct device *child,
struct pwm_export *export = child_to_pwm_export(child);
struct pwm_device *pwm = export->pwm;
struct pwm_state state;
- unsigned int val;
+ u64 val;
int ret;

- ret = kstrtouint(buf, 0, &val);
+ ret = kstrtou64(buf, 0, &val);
if (ret)
return ret;

@@ -77,7 +77,7 @@ static ssize_t duty_cycle_show(struct device *child,

pwm_get_state(pwm, &state);

- return sprintf(buf, "%u\n", state.duty_cycle);
+ return sprintf(buf, "%llu\n", state.duty_cycle);
}

static ssize_t duty_cycle_store(struct device *child,
@@ -212,7 +212,7 @@ static ssize_t capture_show(struct device *child,
if (ret)
return ret;

- return sprintf(buf, "%u %u\n", result.period, result.duty_cycle);
+ return sprintf(buf, "%llu %llu\n", result.period, result.duty_cycle);
}

static DEVICE_ATTR_RW(period);
diff --git a/include/linux/pwm.h b/include/linux/pwm.h
index b2c9c46..1efdd63 100644
--- a/include/linux/pwm.h
+++ b/include/linux/pwm.h
@@ -39,7 +39,7 @@ enum pwm_polarity {
* current PWM hardware state.
*/
struct pwm_args {
- unsigned int period;
+ u64 period;
enum pwm_polarity polarity;
};

@@ -56,8 +56,8 @@ enum {
* @enabled: PWM enabled status
*/
struct pwm_state {
- unsigned int period;
- unsigned int duty_cycle;
+ u64 period;
+ u64 duty_cycle;
enum pwm_polarity polarity;
bool enabled;
};
@@ -105,13 +105,13 @@ static inline bool pwm_is_enabled(const struct pwm_device *pwm)
return state.enabled;
}

-static inline void pwm_set_period(struct pwm_device *pwm, unsigned int period)
+static inline void pwm_set_period(struct pwm_device *pwm, u64 period)
{
if (pwm)
pwm->state.period = period;
}

-static inline unsigned int pwm_get_period(const struct pwm_device *pwm)
+static inline u64 pwm_get_period(const struct pwm_device *pwm)
{
struct pwm_state state;

@@ -126,7 +126,7 @@ static inline void pwm_set_duty_cycle(struct pwm_device *pwm, unsigned int duty)
pwm->state.duty_cycle = duty;
}

-static inline unsigned int pwm_get_duty_cycle(const struct pwm_device *pwm)
+static inline u64 pwm_get_duty_cycle(const struct pwm_device *pwm)
{
struct pwm_state state;

@@ -308,8 +308,8 @@ struct pwm_chip {
* @duty_cycle: duty cycle of the PWM signal (in nanoseconds)
*/
struct pwm_capture {
- unsigned int period;
- unsigned int duty_cycle;
+ u64 period;
+ u64 duty_cycle;
};

#if IS_ENABLED(CONFIG_PWM)
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project