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

[Eric Nelson <eric.nelson@boundarydevices.com>]

On 03/02/2012 07:18 PM, Marek Vasut wrote:
>> 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?
>
Is there a non-blocking read from stdin available to boot script?

How would we represent keys like "Menu", "Home", "Volume up" and "Volume down"?

Through ANSI escape sequences?

Please advise,


Eric