[Qemu-devel] [RFC][PATCH 2/2] MusicPal: Add specific -hold-button option

[Jan Kiszka <jan.kiszka@web.de>]

MusicPal's U-Boot is able to start in a special mode (firmware recovery)
in case one of the control buttons is pressed during power-up. As with
QEMU there is no chance to achieve this manually (without delaying the
power-up with sleep()), this patch adds a MusicPal-specific command line
option -hold-button. This option that takes button codes and simulates
that the provided ones are pressed on power-up.

Signed-off-by: Jan Kiszka <jan.kiszka@web.de>
---
 hw/musicpal.c |   49 ++++++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 42 insertions(+), 7 deletions(-)

Index: b/hw/musicpal.c
===================================================================
--- a/hw/musicpal.c
+++ b/hw/musicpal.c
@@ -62,6 +62,7 @@ static uint32_t gpio_in_state = 0xffffff
 static uint32_t gpio_isr;
 static uint32_t gpio_out_state;
 static ram_addr_t sram_off;
+static int powerup_hold_button;
 
 /* Address conversion helpers */
 static void *target2host_addr(uint32_t addr)
@@ -1344,6 +1345,12 @@ static void musicpal_key_event(void *opa
     uint32_t event = 0;
     static int kbd_extended;
 
+    if (powerup_hold_button) {
+        powerup_hold_button = 0;
+        gpio_in_state |= MP_GPIO_BTN_FAVORITS | MP_GPIO_BTN_VOLUME |
+                         MP_GPIO_BTN_NAVIGATION | MP_GPIO_BTN_MENU;
+    }
+
     if (keycode == KEYCODE_EXTENDED) {
         kbd_extended = 1;
         return;
@@ -1491,12 +1498,6 @@ static void musicpal_init(ram_addr_t ram
 
     qemu_add_kbd_event_handler(musicpal_key_event, pic[MP_GPIO_IRQ]);
 
-    /*
-     * Wait a bit to catch menu button during U-Boot start-up
-     * (to trigger emergency update).
-     */
-    sleep(1);
-
     mv88w8618_eth_init(&nd_table[0], MP_ETH_BASE, pic[MP_ETH_IRQ]);
 
     mixer_i2c = musicpal_audio_init(MP_AUDIO_BASE, pic[MP_AUDIO_IRQ]);
@@ -1508,9 +1509,43 @@ static void musicpal_init(ram_addr_t ram
     arm_load_kernel(env, &musicpal_binfo);
 }
 
+int musicpal_parse_option(const char *optname, const char *optarg)
+{
+    if (strcmp(optname, "-hold-button") == 0) {
+        while (optarg && *optarg != 0) {
+            switch (*optarg) {
+            case 'f':
+                gpio_in_state &= ~MP_GPIO_BTN_FAVORITS;
+                break;
+            case 'm':
+                gpio_in_state &= ~MP_GPIO_BTN_MENU;
+                break;
+            case 'n':
+                gpio_in_state &= ~MP_GPIO_BTN_NAVIGATION;
+                break;
+            case 'v':
+                gpio_in_state &= ~MP_GPIO_BTN_VOLUME;
+                break;
+            default:
+                fprintf(stderr, "Invalid button specified: %c\n", *optarg);
+                exit(1);
+            }
+            optarg++;
+            powerup_hold_button = 1;
+        }
+        return 1;
+    }
+    return -1;
+}
+
 QEMUMachine musicpal_machine = {
     "musicpal",
     "Marvell 88w8618 / MusicPal (ARM926EJ-S)",
     musicpal_init,
-    MP_RAM_DEFAULT_SIZE + MP_SRAM_SIZE + MP_FLASH_SIZE_MAX + RAMSIZE_FIXED
+    MP_RAM_DEFAULT_SIZE + MP_SRAM_SIZE + MP_FLASH_SIZE_MAX + RAMSIZE_FIXED,
+    "-hold-button [f][m][n][v]\n"
+    "                Hold favorits (f), menu (m), navigation (n), or volume(v)\n"
+    "                button on power-up to trigger special services. The button\n"
+    "                is released on next keystroke.\n",
+    musicpal_parse_option
 };