diff options
Diffstat (limited to 'drivers/input/misc/rotary_encoder.c')
| -rw-r--r-- | drivers/input/misc/rotary_encoder.c | 33 |
1 files changed, 25 insertions, 8 deletions
diff --git a/drivers/input/misc/rotary_encoder.c b/drivers/input/misc/rotary_encoder.c index ebbadf3f0579..aeeaaea69610 100644 --- a/drivers/input/misc/rotary_encoder.c +++ b/drivers/input/misc/rotary_encoder.c @@ -33,6 +33,7 @@ struct rotary_encoder { struct input_dev *input; const struct rotary_encoder_platform_data *pdata; + struct mutex access_mutex; unsigned int axis; unsigned int pos; @@ -48,8 +49,8 @@ struct rotary_encoder { static int rotary_encoder_get_state(const struct rotary_encoder_platform_data *pdata) { - int a = !!gpio_get_value(pdata->gpio_a); - int b = !!gpio_get_value(pdata->gpio_b); + int a = !!gpio_get_value_cansleep(pdata->gpio_a); + int b = !!gpio_get_value_cansleep(pdata->gpio_b); a ^= pdata->inverted_a; b ^= pdata->inverted_b; @@ -94,6 +95,8 @@ static irqreturn_t rotary_encoder_irq(int irq, void *dev_id) struct rotary_encoder *encoder = dev_id; int state; + mutex_lock(&encoder->access_mutex); + state = rotary_encoder_get_state(encoder->pdata); switch (state) { @@ -115,6 +118,8 @@ static irqreturn_t rotary_encoder_irq(int irq, void *dev_id) break; } + mutex_unlock(&encoder->access_mutex); + return IRQ_HANDLED; } @@ -123,6 +128,8 @@ static irqreturn_t rotary_encoder_half_period_irq(int irq, void *dev_id) struct rotary_encoder *encoder = dev_id; int state; + mutex_lock(&encoder->access_mutex); + state = rotary_encoder_get_state(encoder->pdata); switch (state) { @@ -140,6 +147,8 @@ static irqreturn_t rotary_encoder_half_period_irq(int irq, void *dev_id) break; } + mutex_unlock(&encoder->access_mutex); + return IRQ_HANDLED; } @@ -149,6 +158,8 @@ static irqreturn_t rotary_encoder_quarter_period_irq(int irq, void *dev_id) unsigned char sum; int state; + mutex_lock(&encoder->access_mutex); + state = rotary_encoder_get_state(encoder->pdata); /* @@ -189,6 +200,8 @@ static irqreturn_t rotary_encoder_quarter_period_irq(int irq, void *dev_id) out: encoder->last_stable = state; + mutex_unlock(&encoder->access_mutex); + return IRQ_HANDLED; } @@ -285,6 +298,8 @@ static int rotary_encoder_probe(struct platform_device *pdev) if (!input) return -ENOMEM; + mutex_init(&encoder->access_mutex); + encoder->input = input; encoder->pdata = pdata; @@ -337,17 +352,19 @@ static int rotary_encoder_probe(struct platform_device *pdev) return -EINVAL; } - err = devm_request_irq(dev, encoder->irq_a, handler, - IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING, - DRV_NAME, encoder); + err = devm_request_threaded_irq(dev, encoder->irq_a, NULL, handler, + IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | + IRQF_ONESHOT, + DRV_NAME, encoder); if (err) { dev_err(dev, "unable to request IRQ %d\n", encoder->irq_a); return err; } - err = devm_request_irq(dev, encoder->irq_b, handler, - IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING, - DRV_NAME, encoder); + err = devm_request_threaded_irq(dev, encoder->irq_b, NULL, handler, + IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | + IRQF_ONESHOT, + DRV_NAME, encoder); if (err) { dev_err(dev, "unable to request IRQ %d\n", encoder->irq_b); return err; |