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pwm: core: Add option to config PWM duty/period with u64 data length

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Currently, PWM core driver provides interfaces for configuring PWM
period and duty length in nanoseconds with an integer data type, so
the max period can be only set to ~2.147 seconds. Add interfaces which
can set PWM period and duty with u64 data type to remove this
limitation.

Change-Id: Ic8722088510d447fc939ab6a5014711aef1b832f
Signed-off-by: Fenglin Wu <fenglinw@codeaurora.org>
This commit is contained in:
Fenglin Wu
2018-09-10 10:05:52 +08:00
committed by Subbaraman Narayanamurthy
parent 9e880ec791
commit a691c36aef
3 changed files with 90 additions and 15 deletions
Download Patch File Download Diff File Expand all files Collapse all files

79
include/linux/pwm.h
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@@ -39,7 +39,7 @@ enum pwm_polarity {
* current PWM hardware state.
*/
struct pwm_args {
unsigned int period;
u64 period;
enum pwm_polarity polarity;
};
@@ -66,9 +66,9 @@ enum pwm_output_type {
* @cycles_per_duty: number of PWM period cycles an entry stays at
*/
struct pwm_output_pattern {
unsigned int *duty_pattern;
u64 *duty_pattern;
unsigned int num_entries;
unsigned int cycles_per_duty;
u64 cycles_per_duty;
};
/*
@@ -79,8 +79,8 @@ struct pwm_output_pattern {
* @enabled: PWM enabled status
*/
struct pwm_state {
unsigned int period;
unsigned int duty_cycle;
u64 period;
u64 duty_cycle;
enum pwm_polarity polarity;
enum pwm_output_type output_type;
struct pwm_output_pattern *output_pattern;
@@ -136,12 +136,30 @@ static inline void pwm_set_period(struct pwm_device *pwm, unsigned int period)
pwm->state.period = period;
}
static inline void pwm_set_period_extend(struct pwm_device *pwm, u64 period)
{
if (pwm)
pwm->state.period = period;
}
static inline unsigned int pwm_get_period(const struct pwm_device *pwm)
{
struct pwm_state state;
pwm_get_state(pwm, &state);
if (state.period > UINT_MAX)
pr_warn("PWM period %llu is truncated\n", state.period);
return (unsigned int)state.period;
}
static inline u64 pwm_get_period_extend(const struct pwm_device *pwm)
{
struct pwm_state state;
pwm_get_state(pwm, &state);
return state.period;
}
@@ -151,12 +169,30 @@ static inline void pwm_set_duty_cycle(struct pwm_device *pwm, unsigned int duty)
pwm->state.duty_cycle = duty;
}
static inline void pwm_set_duty_cycle_extend(struct pwm_device *pwm, u64 duty)
{
if (pwm)
pwm->state.duty_cycle = duty;
}
static inline unsigned int pwm_get_duty_cycle(const struct pwm_device *pwm)
{
struct pwm_state state;
pwm_get_state(pwm, &state);
if (state.duty_cycle > UINT_MAX)
pr_warn("PWM duty cycle %llu is truncated\n", state.duty_cycle);
return (unsigned int)state.duty_cycle;
}
static inline u64 pwm_get_duty_cycle_extend(const struct pwm_device *pwm)
{
struct pwm_state state;
pwm_get_state(pwm, &state);
return state.duty_cycle;
}
@@ -288,6 +324,8 @@ pwm_set_relative_duty_cycle(struct pwm_state *state, unsigned int duty_cycle,
* @request: optional hook for requesting a PWM
* @free: optional hook for freeing a PWM
* @config: configure duty cycles and period length for this PWM
* @config_extend: configure duty cycles and period length for this
* PWM with u64 data type
* @set_polarity: configure the polarity of this PWM
* @capture: capture and report PWM signal
* @enable: enable PWM output toggling
@@ -310,6 +348,8 @@ struct pwm_ops {
void (*free)(struct pwm_chip *chip, struct pwm_device *pwm);
int (*config)(struct pwm_chip *chip, struct pwm_device *pwm,
int duty_ns, int period_ns);
int (*config_extend)(struct pwm_chip *chip, struct pwm_device *pwm,
u64 duty_ns, u64 period_ns);
int (*set_polarity)(struct pwm_chip *chip, struct pwm_device *pwm,
enum pwm_polarity polarity);
int (*capture)(struct pwm_chip *chip, struct pwm_device *pwm,
@@ -364,8 +404,8 @@ 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)
@@ -418,6 +458,31 @@ static inline int pwm_config(struct pwm_device *pwm, int duty_ns,
return pwm_apply_state(pwm, &state);
}
/**
* pwm_config_extend() - change PWM period and duty length with u64 data type
* @pwm: PWM device
* @duty_ns: "on" time (in nanoseconds)
* @period_ns: duration (in nanoseconds) of one cycle
*
* Returns: 0 on success or a negative error code on failure.
*/
static inline int pwm_config_extend(struct pwm_device *pwm, u64 duty_ns,
u64 period_ns)
{
struct pwm_state state;
if (!pwm)
return -EINVAL;
pwm_get_state(pwm, &state);
if (state.duty_cycle == duty_ns && state.period == period_ns)
return 0;
state.duty_cycle = duty_ns;
state.period = period_ns;
return pwm_apply_state(pwm, &state);
}
/**
* pwm_set_polarity() - configure the polarity of a PWM signal
* @pwm: PWM device