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Message-ID: <20091020101357.GR28832@buzzloop.caiaq.de> Date: Tue, 20 Oct 2009 12:13:57 +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 Mon, Oct 19, 2009 at 06:38:53PM -0700, Dmitry Torokhov wrote: > On Mon, Oct 19, 2009 at 09:37:28AM +0200, Daniel Mack wrote: > > +#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 +158,10 @@ 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); > > + > > + if (ipdev) > > + input_unregister_polled_device(ipdev); > > + > > > I think it will bomb on !CONFIG_LEDS_ALIX2_BUTTON... You need > alix_button_register() and a dummy wrapper for it as well. There is one actually - lazyly implemented as #define in this case. But you're right, it does bomb, but due to an undefined reference to ipdev in alix_led_remove(). Below is a new patch the finally works fine for both configs. Daniel >From f3ed2eb2a123a2d2ff1fd587d1ff1076893ae148 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 | 61 +++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 75 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..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; } -- 1.6.0.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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