On Thursday, February 26, 2009 11:43 AM, Daniel Mack wrote:
> This patch adds a generic driver for rotary encoders connected
> to GPIO pins of a system. It relies on gpiolib and generic
> hardware irqs. The documentation that also comes with this patch
> explains the concept and how to use the driver.
>
> Signed-off-by: Daniel Mack <daniel@xxxxxxxx>
+
+/* board support file example */
+
+#define GPIO_ROTARY_A 1
+#define GPIO_ROTARY_B 2
+
+static struct resource rotary_encoder_resources[] = {
+ [0] = {
+ .flags = IORESOURCE_IRQ,
+ .start = IRQ_GPIO(GPIO_ROTARY_A)
+ },
+ [1] = {
+ .flags = IORESOURCE_IRQ,
+ .start = IRQ_GPIO(GPIO_ROTARY_B)
+ }
+};
+
+static struct rotary_encoder_platform_data my_rotary_encoder_info = {
+ .steps = 24,
+ .gpio_a = GPIO_ROTARY_A,
+ .gpio_b = GPIO_ROTARY_B,
+ .inverted_a = 0,
+ .inverted_b = 0,
+};
+
+static struct platform_device rotary_encoder_device = {
+ .name = "rotary-encoder",
+ .id = 0,
+ .num_resources = ARRAY_SIZE(rotary_encoder_resources),
+ .resource = rotary_encoder_resources,
+ .dev = {
+ .platform_data = &my_rotary_encoder_info,
+ }
+};
+
IRQ_GPIO appears to be only defined for mach-imx and mach-pxa.
Why not just use the platform_data information to get the irq for the
gpio at runtime with gpio_to_irq()?
+#include <linux/rotary-encoder.h>
This file is missing in the patch.
Regards,
Hartley
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