The configuration register for the onboard LEDs is
emulated, but the state is not exported, which makes
the feature not particularly useful. Create a character
device to make status changes accessible to the host.
For example, use the command line argument
-chardev socket,id=leds,host=localhost,port=12345,server,nowait
to observe status changes via a socket.
Signed-off-by: Wolfgang Mauerer <wolfgang.maue...@siemens.com>
---
hw/arm_sysctl.c | 24 ++++++++++++++++++++++++
1 files changed, 24 insertions(+), 0 deletions(-)
diff --git a/hw/arm_sysctl.c b/hw/arm_sysctl.c
index b733617..7cb8559 100644
--- a/hw/arm_sysctl.c
+++ b/hw/arm_sysctl.c
@@ -19,6 +19,7 @@ typedef struct {
SysBusDevice busdev;
MemoryRegion iomem;
qemu_irq pl110_mux_ctrl;
+ CharDriverState *display;
uint32_t sys_id;
uint32_t leds;
@@ -92,6 +93,24 @@ static void arm_sysctl_reset(DeviceState *d)
}
}
+static void notify_led_change(CharDriverState *chr, uint32_t old, uint32_t new)
+{
+ uint32_t changed;
+ unsigned int i;
+
+ if (chr == NULL) {
+ return;
+ }
+
+ changed = old ^ new;
+ for (i = 0; i < 8; i++) {
+ if (changed & (1 << i)) {
+ qemu_chr_fe_printf(chr, "%u:%s\r\n", i,
+ new & (1 << i) ? "on" : "off");
+ }
+ }
+}
+
static uint64_t arm_sysctl_read(void *opaque, hwaddr offset,
unsigned size)
{
@@ -198,6 +217,7 @@ static void arm_sysctl_write(void *opaque, hwaddr offset,
switch (offset) {
case 0x08: /* LED */
+ notify_led_change(s->display, s->leds, (uint32_t)val);
s->leds = val;
case 0x0c: /* OSC0 */
case 0x10: /* OSC1 */
@@ -386,6 +406,10 @@ static int arm_sysctl_init(SysBusDevice *dev)
{
arm_sysctl_state *s = FROM_SYSBUS(arm_sysctl_state, dev);
+ s->display = qemu_chr_new("leds0", "chardev:leds", NULL);
+ if (s->display) {
+ qemu_chr_fe_printf(s->display, "8 LEDs available\r\n");
+ }
memory_region_init_io(&s->iomem, &arm_sysctl_ops, s, "arm-sysctl", 0x1000);
sysbus_init_mmio(dev, &s->iomem);
qdev_init_gpio_in(&s->busdev.qdev, arm_sysctl_gpio_set, 2);
--
1.7.1
