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

Eric Nelson
2012-03-03T00:00:24Z

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"
+);
--
1.7.9