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pwm: Expose PWM_WFHWSIZE in public header

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The WFHWSIZE constant defines the maximum size for the hardware-specific
waveform representation buffer. It is currently local to
drivers/pwm/core.c, which makes it inaccessible to external tools like
bindgen.

Move the constant to include/linux/pwm.h to make it part of the public
API. As part of this change, rename it to PWM_WFHWSIZE to follow
standard kernel conventions for namespacing macros in public headers.

This allows bindgen to automatically generate a corresponding constant
for the Rust PWM abstractions, ensuring the value remains synchronized
between the C core and Rust code and preventing future maintenance
issues.

Signed-off-by: Michal Wilczynski <m.wilczynski@samsung.com>
Link: https://lore.kernel.org/r/20250702-rust-next-pwm-working-fan-for-sending-v7-1-67ef39ff1d29@samsung.com
Signed-off-by: Uwe Kleine-König <ukleinek@kernel.org>
This commit is contained in:
Michal Wilczynski 2025-07-02 15:45:29 +02:00 committed by Uwe Kleine-König
parent 4cd2f417a0
commit edd3bcb180
2 changed files with 14 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
drivers/pwm/core.c
View File

@ -210,8 +210,6 @@ static int __pwm_write_waveform(struct pwm_chip *chip, struct pwm_device *pwm, c
return ret;
}
#define WFHWSIZE 20
/**
* pwm_round_waveform_might_sleep - Query hardware capabilities
* Cannot be used in atomic context.
@ -248,10 +246,10 @@ int pwm_round_waveform_might_sleep(struct pwm_device *pwm, struct pwm_waveform *
struct pwm_chip *chip = pwm->chip;
const struct pwm_ops *ops = chip->ops;
struct pwm_waveform wf_req = *wf;
char wfhw[WFHWSIZE];
char wfhw[PWM_WFHWSIZE];
int ret_tohw, ret_fromhw;
BUG_ON(WFHWSIZE < ops->sizeof_wfhw);
BUG_ON(PWM_WFHWSIZE < ops->sizeof_wfhw);
if (!pwmchip_supports_waveform(chip))
return -EOPNOTSUPP;
@ -306,10 +304,10 @@ int pwm_get_waveform_might_sleep(struct pwm_device *pwm, struct pwm_waveform *wf
{
struct pwm_chip *chip = pwm->chip;
const struct pwm_ops *ops = chip->ops;
char wfhw[WFHWSIZE];
char wfhw[PWM_WFHWSIZE];
int err;
BUG_ON(WFHWSIZE < ops->sizeof_wfhw);
BUG_ON(PWM_WFHWSIZE < ops->sizeof_wfhw);
if (!pwmchip_supports_waveform(chip) || !ops->read_waveform)
return -EOPNOTSUPP;
@ -334,11 +332,11 @@ static int __pwm_set_waveform(struct pwm_device *pwm,
{
struct pwm_chip *chip = pwm->chip;
const struct pwm_ops *ops = chip->ops;
char wfhw[WFHWSIZE];
char wfhw[PWM_WFHWSIZE];
struct pwm_waveform wf_rounded;
int err, ret_tohw;
BUG_ON(WFHWSIZE < ops->sizeof_wfhw);
BUG_ON(PWM_WFHWSIZE < ops->sizeof_wfhw);
if (!pwmchip_supports_waveform(chip))
return -EOPNOTSUPP;
@ -650,9 +648,9 @@ static int __pwm_apply(struct pwm_device *pwm, const struct pwm_state *state)
if (pwmchip_supports_waveform(chip)) {
struct pwm_waveform wf;
char wfhw[WFHWSIZE];
char wfhw[PWM_WFHWSIZE];
BUG_ON(WFHWSIZE < ops->sizeof_wfhw);
BUG_ON(PWM_WFHWSIZE < ops->sizeof_wfhw);
pwm_state2wf(state, &wf);
@ -809,10 +807,10 @@ int pwm_get_state_hw(struct pwm_device *pwm, struct pwm_state *state)
return -ENODEV;
if (pwmchip_supports_waveform(chip) && ops->read_waveform) {
char wfhw[WFHWSIZE];
char wfhw[PWM_WFHWSIZE];
struct pwm_waveform wf;
BUG_ON(WFHWSIZE < ops->sizeof_wfhw);
BUG_ON(PWM_WFHWSIZE < ops->sizeof_wfhw);
ret = __pwm_read_waveform(chip, pwm, &wfhw);
if (ret)
@ -1696,8 +1694,8 @@ static bool pwm_ops_check(const struct pwm_chip *chip)
!ops->write_waveform)
return false;
if (WFHWSIZE < ops->sizeof_wfhw) {
dev_warn(pwmchip_parent(chip), "WFHWSIZE < %zu\n", ops->sizeof_wfhw);
if (PWM_WFHWSIZE < ops->sizeof_wfhw) {
dev_warn(pwmchip_parent(chip), "PWM_WFHWSIZE < %zu\n", ops->sizeof_wfhw);
return false;
}
} else {

2
include/linux/pwm.h
View File

@ -274,6 +274,8 @@ struct pwm_capture {
unsigned int duty_cycle;
};
#define PWM_WFHWSIZE 20
/**
* struct pwm_ops - PWM controller operations
* @request: optional hook for requesting a PWM