diff mbox

leds-alix2: add support for button connected to J15

Message ID 20091020101357.GR28832@buzzloop.caiaq.de
State New, archived
Headers show

Commit Message

Daniel Mack Oct. 20, 2009, 10:13 a.m. UTC
None
diff mbox

Patch

diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index e4f599f..2faba0a 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -77,6 +77,20 @@  config LEDS_ALIX2
 	  This option enables support for the PCEngines ALIX.2 and ALIX.3 LEDs.
 	  You have to set leds-alix2.force=1 for boards with Award BIOS.
 
+config LEDS_ALIX2_BUTTON
+	bool "Input device support for button on ALIX boards"
+	depends on LEDS_ALIX2 && INPUT
+	select INPUT_POLLDEV
+	help
+	  This option enables support for a button connected to J15 of ALIX
+	  boards.
+	  
+	  Note that for this feature to work, there is need for a minor
+	  modification to the hardware: R1 needs to be removed, and R4 needs
+	  to be placed as 100 KOhms pull-up.
+	  
+	  Only select that option if you modified your ALIX board like this.
+
 config LEDS_H1940
 	tristate "LED Support for iPAQ H1940 device"
 	depends on LEDS_CLASS && ARCH_H1940
diff --git a/drivers/leds/leds-alix2.c b/drivers/leds/leds-alix2.c
index f59ffad..6ef6362 100644
--- a/drivers/leds/leds-alix2.c
+++ b/drivers/leds/leds-alix2.c
@@ -12,6 +12,7 @@ 
 #include <linux/platform_device.h>
 #include <linux/string.h>
 #include <linux/pci.h>
+#include <linux/input-polldev.h>
 
 static int force = 0;
 module_param(force, bool, 0444);
@@ -78,6 +79,55 @@  static struct alix_led alix_leds[] = {
 	},
 };
 
+#ifdef CONFIG_LEDS_ALIX2_BUTTON
+
+#define POLL_INTERVAL_DEFAULT 250
+static struct input_polled_dev *ipdev;
+
+static void alix_button_poll(struct input_polled_dev *ipdev)
+{
+	unsigned int val = !(inl(gpio_base + 0x30) & (1 << 1));
+
+	input_report_key(ipdev->input, KEY_PROG1, val);
+	input_sync(ipdev->input);
+}
+
+static int alix_button_register(void)
+{
+	int ret;
+
+	/* enable button input */
+	outl(1 << 1, gpio_base + 0x20);
+
+	/* enable pullup on input pin */
+	outl(1 << 1, gpio_base + 0x18);
+
+	ipdev = input_allocate_polled_device();
+	if (!ipdev)
+		return -ENOMEM;
+
+	ipdev->poll = alix_button_poll;
+	ipdev->poll_interval = POLL_INTERVAL_DEFAULT;
+	ipdev->input->name = "ALIX2 button";
+	ipdev->input->phys = "alix2/input0";
+	ipdev->input->id.bustype = BUS_HOST;
+
+	set_bit(EV_KEY, ipdev->input->evbit);
+	ipdev->input->keybit[BIT_WORD(KEY_PROG1)] = BIT_MASK(KEY_PROG1);
+
+	ret = input_register_polled_device(ipdev);
+	
+	if (ret) {
+		input_free_polled_device(ipdev);
+		ipdev = NULL;
+	}
+
+	return ret;
+}
+#else
+#define alix_button_register() (0)
+#endif
+
 static int __init alix_led_probe(struct platform_device *pdev)
 {
 	int i;
@@ -89,6 +139,11 @@  static int __init alix_led_probe(struct platform_device *pdev)
 		if (ret < 0)
 			goto fail;
 	}
+
+	ret = alix_button_register();
+	if (ret) 
+		goto fail;
+
 	return 0;
 
 fail:
@@ -103,6 +158,12 @@  static int alix_led_remove(struct platform_device *pdev)
 
 	for (i = 0; i < ARRAY_SIZE(alix_leds); i++)
 		led_classdev_unregister(&alix_leds[i].cdev);
+
+#ifdef CONFIG_LEDS_ALIX2_BUTTON
+	if (ipdev)
+		input_unregister_polled_device(ipdev);
+#endif
+
 	return 0;
 }