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Input: pwm-vibra - prevent unbalanced regulator 

pwm_vibrator_stop disables the regulator, but it can be called from
multiple places, even when the regulator is already disabled. Fix this
by using regulator_is_enabled check when starting and stopping device.

Signed-off-by: Jonathan Bakker <xc-racer2@live.ca>
Signed-off-by: Paweł Chmiel <pawel.mikolaj.chmiel@gmail.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Jonathan Bakker 2019-01-28 11:13:01 -08:00 committed by Dmitry Torokhov
parent 4d741f3dd1
commit 3ca232df99
1 changed files with 12 additions and 5 deletions
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17
drivers/input/misc/pwm-vibra.c
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@ -34,6 +34,7 @@ struct pwm_vibrator {
struct work_struct play_work;
u16 level;
u32 direction_duty_cycle;
bool vcc_on;
};
static int pwm_vibrator_start(struct pwm_vibrator *vibrator)
@ -42,10 +43,13 @@ static int pwm_vibrator_start(struct pwm_vibrator *vibrator)
struct pwm_state state;
int err;
err = regulator_enable(vibrator->vcc);
if (err) {
dev_err(pdev, "failed to enable regulator: %d", err);
return err;
if (!vibrator->vcc_on) {
err = regulator_enable(vibrator->vcc);
if (err) {
dev_err(pdev, "failed to enable regulator: %d", err);
return err;
}
vibrator->vcc_on = true;
}
pwm_get_state(vibrator->pwm, &state);
@ -76,7 +80,10 @@ static int pwm_vibrator_start(struct pwm_vibrator *vibrator)
static void pwm_vibrator_stop(struct pwm_vibrator *vibrator)
{
regulator_disable(vibrator->vcc);
if (vibrator->vcc_on) {
regulator_disable(vibrator->vcc);
vibrator->vcc_on = false;
}
if (vibrator->pwm_dir)
pwm_disable(vibrator->pwm_dir);