[PATCH 1/9] ARM: boards: protonic-imx6: prtvt7 hardkey inputs are active low

Robin van der Gracht robin at protonic.nl
Mon Jun 20 08:42:36 PDT 2022

Hello Ahmad,

On 2022-06-20 09:51, Ahmad Fatoum wrote:
> Hello,
> On 17.06.22 10:44, Marco Felsch wrote:
>> On 22-06-17, Sascha Hauer wrote:
>>>> Or, it is active low and your patch is correct :D
>>> If they are, can we add a comment or _N suffix to the names?
>> Does barebox not have gpiod? The board code just should check if it is
>> active or not. Whatever active means in this case.
> There is gpiod_get(), but there's also gpio-keys support. See
> drivers/input/specialkeys.c for an example on how to register an input
> notifier.

I'm interested in two keys pressed at the same time. When I implement a
notifyer like in specialkeys.c I'll have to check if the other key is pressed
at that time as well.

I noticed that the input subsystem is already maintaining a bitmask with keys
pressed. If I tap into that, I can implement it like so:

diff --git a/arch/arm/boards/protonic-imx6/board.c 
index 8436903fd8..1e1a22ae8e 100644
--- a/arch/arm/boards/protonic-imx6/board.c
+++ b/arch/arm/boards/protonic-imx6/board.c
@@ -8,11 +8,13 @@
  #include <bootm.h>
  #include <common.h>
  #include <deep-probe.h>
+#include <dt-bindings/input/linux-event-codes.h>
  #include <environment.h>
  #include <fcntl.h>
  #include <globalvar.h>
  #include <gpio.h>
  #include <i2c/i2c.h>
+#include <input/input.h>
  #include <mach/bbu.h>
  #include <mach/imx6.h>
  #include <mach/ocotp-fusemap.h>
@@ -742,17 +744,13 @@ static int prt_imx6_init_kvg_yaco(struct prt_imx6_priv 
         return prt_imx6_init_kvg_power(priv, PW_MODE_KVG_WITH_YACO);

-#define GPIO_KEY_F6     (0xe0 + 5)
-#define GPIO_KEY_CYCLE  (0xe0 + 2)
  static int prt_imx6_init_prtvt7(struct prt_imx6_priv *priv)
-       /* This function relies heavely on the gpio-pca9539 driver */
+       unsigned long keys[BITS_TO_LONGS(KEY_CYCLEWINDOWS)];

-       gpio_direction_input(GPIO_KEY_F6);
-       gpio_direction_input(GPIO_KEY_CYCLE);
+       input_key_get_status(keys, KEY_CYCLEWINDOWS);

-       if (gpio_get_value(GPIO_KEY_CYCLE) || gpio_get_value(GPIO_KEY_F6))
+       if (!(test_bit(KEY_CYCLEWINDOWS, keys) && test_bit(KEY_F6, keys)))
                 priv->no_usb_check = 1;

         return 0;

- Robin

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