[U-Boot] [PATCH] i.MX6: mx6qsabrelite: Add keypress support

[Marek Vasut <marex@denx.de>]

> This patch adds support for the GPIO keyboard used on MX6Q SabreLite.
> 
> This is generally used for invoking Android "recovery mode" in
> response to a long press of volume key down during boot.
> 
> This can be tested by a boot script like so:
>     if keypress voldown && sleep 1 && keypress voldown ; then
>           echo "do recovery thing" ;
>     fi
> 
> Key values can be seen by issuing keypress with no arguments:
> 
> 	MX6QSABRELITE U-Boot > keypress
> 	keys: !menu	!back	!search	!home	!volup	!voldown
> ---
>  board/freescale/mx6qsabrelite/mx6qsabrelite.c |   76
> +++++++++++++++++++++++++ 1 files changed, 76 insertions(+), 0
> deletions(-)
> 
> diff --git a/board/freescale/mx6qsabrelite/mx6qsabrelite.c
> b/board/freescale/mx6qsabrelite/mx6qsabrelite.c index e0ba6a4..0d45615
> 100644
> --- a/board/freescale/mx6qsabrelite/mx6qsabrelite.c
> +++ b/board/freescale/mx6qsabrelite/mx6qsabrelite.c
> @@ -50,6 +50,10 @@ DECLARE_GLOBAL_DATA_PTR;
>  	PAD_CTL_PUS_100K_DOWN | PAD_CTL_SPEED_MED |		\
>  	PAD_CTL_DSE_40ohm     | PAD_CTL_SRE_FAST)
> 
> +#define BUTTON_PAD_CTRL (PAD_CTL_PKE | PAD_CTL_PUE |		\
> +	PAD_CTL_PUS_100K_UP | PAD_CTL_SPEED_MED   |		\
> +	PAD_CTL_DSE_40ohm   | PAD_CTL_HYS)
> +
>  int dram_init(void)
>  {
>         gd->ram_size = get_ram_size((void *)PHYS_SDRAM, PHYS_SDRAM_SIZE);
> @@ -122,6 +126,15 @@ iomux_v3_cfg_t enet_pads2[] = {
>  	MX6Q_PAD_RGMII_RX_CTL__RGMII_RX_CTL	| MUX_PAD_CTRL(ENET_PAD_CTRL),
>  };
> 
> +static iomux_v3_cfg_t const button_pads[] = {
> +	MX6Q_PAD_NANDF_D1__GPIO_2_1	| MUX_PAD_CTRL(BUTTON_PAD_CTRL), /* J14 
-
> Menu Button */ +	MX6Q_PAD_NANDF_D2__GPIO_2_2	|
> MUX_PAD_CTRL(BUTTON_PAD_CTRL), /* J14 - Back Button */
> +	MX6Q_PAD_NANDF_D3__GPIO_2_3	| MUX_PAD_CTRL(BUTTON_PAD_CTRL), /* J14 
-
> Search Button */ +	MX6Q_PAD_NANDF_D4__GPIO_2_4	|
> MUX_PAD_CTRL(BUTTON_PAD_CTRL), /* J14 - Home Button */
> +	MX6Q_PAD_GPIO_19__GPIO_4_5	| MUX_PAD_CTRL(BUTTON_PAD_CTRL), /* J14 
-
> Volume Down */ +	MX6Q_PAD_GPIO_18__GPIO_7_13	|
> MUX_PAD_CTRL(BUTTON_PAD_CTRL), /* J14 - Volume Up */ +};
> +
>  static void setup_iomux_enet(void)
>  {
>  	gpio_direction_output(87, 0);  /* GPIO 3-23 */
> @@ -323,10 +336,18 @@ int setup_sata(void)
>  }
>  #endif
> 
> +static void setup_buttons(void)
> +{
> +	imx_iomux_v3_setup_multiple_pads(button_pads,
> +					 ARRAY_SIZE(button_pads));
> +}
> +
>  int board_early_init_f(void)
>  {
>         setup_iomux_uart();
> 
> +       setup_buttons();
> +
>  #ifdef CONFIG_CMD_SATA
>  	setup_sata();
>  #endif
> @@ -350,3 +371,58 @@ int checkboard(void)
> 
>         return 0;
>  }
> +
> +struct button_key {
> +	char const	*name;
> +	unsigned	gpnum;
> +};
> +
> +static struct button_key const buttons[] = {
> +	{"menu",	GPIO_NUMBER(2, 1)},
> +	{"back",	GPIO_NUMBER(2, 2)},
> +	{"search",	GPIO_NUMBER(2, 3)},
> +	{"home",	GPIO_NUMBER(2, 4)},
> +	{"voldown",	GPIO_NUMBER(4, 5)},
> +	{"volup",	GPIO_NUMBER(7, 13)},
> +};
> +
> +static int keypress(cmd_tbl_t *cmdtp, int flag, int argc, char * const
> argv[]) +{
> +	if (1 < argc) {
> +		int arg;
> +		int pressed = 1 ;
> +		for (arg=1; arg<argc; arg++) {
> +			char const *keyname=argv[arg];
> +			int i;
> +			for (i=0; pressed && (i < ARRAY_SIZE(buttons)); i++) {
> +				if (0 == strcmp(buttons[i].name,keyname)) {
> +					pressed = pressed && (0 == 
gpio_get_value(buttons[i].gpnum));
> +					break;
> +				}
> +			}
> +			if (ARRAY_SIZE(buttons) == i) {
> +				printf ("unrecognized key %s\n", keyname);
> +				pressed = 0;
> +				break;
> +			}
> +		}
> +		return (0 == pressed);
> +	} else {
> +		int i;
> +		printf ("keys: ");
> +		for (i=0; i<ARRAY_SIZE(buttons); i++) {
> +			if (0 != gpio_get_value(buttons[i].gpnum))
> +				printf("!");
> +			printf("%s\t",buttons[i].name);
> +		}
> +		printf("\n");
> +		return 0 ;
> +	}
> +}
> +
> +U_BOOT_CMD(
> +	keypress, CONFIG_SYS_MAXARGS, 1, keypress,
> +	"Display or test keypresses",
> +	"    keypress		- show key(s) pressed\n"
> +	"    keypress name	- test key name (return 0 if pressed)\n"
> +);

Why not make it an STDIN device as any other keyboard?

M