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Message-ID: <20091021193347.GL14091@buzzloop.caiaq.de>
Date: Wed, 21 Oct 2009 21:33:47 +0200
From: Daniel Mack <daniel@...aq.de>
To: Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc: Richard Purdie <rpurdie@...ys.net>, linux-kernel@...r.kernel.org,
linux-input@...r.kernel.org, Constantin Baranov <const@...as.ru>
Subject: Re: [PATCH] leds-alix2: add support for button connected to J15
Hi Dmitry,
On Tue, Oct 20, 2009 at 09:35:53PM -0700, Dmitry Torokhov wrote:
> On Tue, Oct 20, 2009 at 12:13:57PM +0200, Daniel Mack wrote:
> > +
> > + ret = input_register_polled_device(ipdev);
> > +
> > + if (ret) {
> > + input_free_polled_device(ipdev);
> > + ipdev = NULL;
> > + }
> > +
> > + return ret;
> > +}
>
> Ah, don't be lazy ;)
Ok ok, you're right, let's do it the clean way. Agreed :)
See the one below.
Thanks!
Daniel
>From 66953e5dda7bbbc22b92541ed3a6020773c62140 Mon Sep 17 00:00:00 2001
From: Daniel Mack <daniel@...aq.de>
Date: Tue, 13 Oct 2009 12:42:52 +0800
Subject: [PATCH] leds-alix2: add support for button connected to J15
The ALIX2 boards have one GPIO pin which is reachable at connector J15.
One possible application for this feature is to connect a button which
closes the two pins.
This patch adds support to query these button and export its state via
an input device.
Signed-off-by: Daniel Mack <daniel@...aq.de>
Cc: Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc: Richard Purdie <rpurdie@...ys.net>
Cc: linux-input@...r.kernel.org
Cc: Constantin Baranov <const@...as.ru>
---
drivers/leds/Kconfig | 14 +++++++++
drivers/leds/leds-alix2.c | 71 +++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 85 insertions(+), 0 deletions(-)
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..c981edf 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 +79,68 @@ 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;
+}
+
+static void alix_button_unregister(void)
+{
+ if (!ipdev)
+ return;
+
+ input_unregister_polled_device(ipdev);
+ /* Yes, polled devices need to be freed */
+ input_free_polled_device(ipdev);
+ ipdev = NULL;
+}
+
+#else
+static inline int alix_button_register(void) { return 0; }
+static inline void alix_button_unregister(void) { }
+#endif
+
static int __init alix_led_probe(struct platform_device *pdev)
{
int i;
@@ -89,6 +152,11 @@ 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 +171,9 @@ 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);
+
+ alix_button_unregister();
+
return 0;
}
--
1.6.0.4
--
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