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pwm: Try to load modules during pwm_get()

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Add a module name string to the pwm_lookup struct and if specified try
to load the module using request_module() if pwmchip_find_by_name() is
unable to find the PWM chip.

This is a last resort to work around drivers that can't - and can't be
made to - deal with deferred probe.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
[thierry.reding@gmail.com: rename new macro, reword commit message]
[thierry.reding@gmail.com: add comment explaining use-case]
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
This commit is contained in:
Hans de Goede 2017-01-22 17:14:08 +01:00 • committed by Thierry Reding
parent 69efb3439c
commit b526a31426
2 changed files with 29 additions and 8 deletions
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23
include/linux/pwm.h
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@ -603,18 +603,25 @@ struct pwm_lookup {
const char *con_id;
unsigned int period;
enum pwm_polarity polarity;
const char *module; /* optional, may be NULL */
};
#define PWM_LOOKUP(_provider, _index, _dev_id, _con_id, _period, _polarity) \
{ \
.provider = _provider, \
.index = _index, \
.dev_id = _dev_id, \
.con_id = _con_id, \
.period = _period, \
.polarity = _polarity \
#define PWM_LOOKUP_WITH_MODULE(_provider, _index, _dev_id, _con_id, \
_period, _polarity, _module) \
{ \
.provider = _provider, \
.index = _index, \
.dev_id = _dev_id, \
.con_id = _con_id, \
.period = _period, \
.polarity = _polarity, \
.module = _module, \
}
#define PWM_LOOKUP(_provider, _index, _dev_id, _con_id, _period, _polarity) \
PWM_LOOKUP_WITH_MODULE(_provider, _index, _dev_id, _con_id, _period, \
_polarity, NULL)
#if IS_ENABLED(CONFIG_PWM)
void pwm_add_table(struct pwm_lookup *table, size_t num);
void pwm_remove_table(struct pwm_lookup *table, size_t num);