#include <linux/platform_device.h>
#include <linux/gpio.h>
#include <linux/rotary_encoder.h>
+#include <linux/slab.h>
#define DRV_NAME "rotary-encoder"
struct input_dev *input;
int err;
- if (!pdata || !pdata->steps) {
- dev_err(&pdev->dev, "invalid platform data\n");
+ if (!pdata) {
+ dev_err(&pdev->dev, "missing platform data\n");
return -ENOENT;
}
goto exit_unregister_input;
}
+ err = gpio_direction_input(pdata->gpio_a);
+ if (err) {
+ dev_err(&pdev->dev, "unable to set GPIO %d for input\n",
+ pdata->gpio_a);
+ goto exit_unregister_input;
+ }
+
err = gpio_request(pdata->gpio_b, DRV_NAME);
if (err) {
dev_err(&pdev->dev, "unable to request GPIO %d\n",
goto exit_free_gpio_a;
}
+ err = gpio_direction_input(pdata->gpio_b);
+ if (err) {
+ dev_err(&pdev->dev, "unable to set GPIO %d for input\n",
+ pdata->gpio_b);
+ goto exit_free_gpio_a;
+ }
+
/* request the IRQs */
err = request_irq(encoder->irq_a, &rotary_encoder_irq,
IORESOURCE_IRQ_HIGHEDGE | IORESOURCE_IRQ_LOWEDGE,