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/* This file contains the device independent input driver interface. */
/*
* Changes:
* Sep 22, 2013 created (D.C. van Moolenbroek)
*/
#include <minix/drivers.h>
#include <minix/inputdriver.h>
#include <minix/ds.h>
static endpoint_t input_endpt = NONE;
static int kbd_id = INVALID_INPUT_ID;
static int mouse_id = INVALID_INPUT_ID;
static int running;
/*
* Announce that we are up after a fresh start or restart.
*/
void
inputdriver_announce(unsigned int type)
{
const char *driver_prefix = "drv.inp.";
char key[DS_MAX_KEYLEN];
char label[DS_MAX_KEYLEN];
int r;
/* Publish a driver up event. */
if ((r = ds_retrieve_label_name(label, sef_self())) != OK)
panic("libinputdriver: unable to retrieve own label: %d", r);
snprintf(key, sizeof(key), "%s%s", driver_prefix, label);
if ((r = ds_publish_u32(key, type, DSF_OVERWRITE)) != OK)
panic("libinputdriver: unable to publish up event: %d", r);
/* Now we wait for the input server to contact us. */
}
/*
* Send an event to the input server.
*/
void
inputdriver_send_event(int mouse, unsigned short page, unsigned short code,
int value, int flags)
{
message m;
int id;
if (input_endpt == NONE)
return;
id = mouse ? mouse_id : kbd_id;
if (id == INVALID_INPUT_ID)
return;
memset(&m, 0, sizeof(m));
m.m_type = INPUT_EVENT;
m.m_linputdriver_input_event.id = id;
m.m_linputdriver_input_event.page = page;
m.m_linputdriver_input_event.code = code;
m.m_linputdriver_input_event.value = value;
m.m_linputdriver_input_event.flags = flags;
/*
* Use a blocking send call, for two reasons. First, this avoids the
* situation that we ever end up queuing too many asynchronous messages
* to the input server. Second, it allows us to detect trivially if
* the input server has crashed, in which case we should stop sending
* more messages to it.
*/
if (ipc_send(input_endpt, &m) != OK)
input_endpt = NONE;
}
/*
* The input server requests that we configure the driver. This request should
* be sent to us once, although it may be sent multiple times if the input
* server crashes and recovers. The configuration consists of device IDs for
* use in keyboard and/or mouse events, one per each device type.
*/
static void
do_conf(message *m_ptr)
{
endpoint_t ep;
int r;
/* Make sure that the sender is actually the input server. */
if ((r = ds_retrieve_label_endpt("input", &ep)) != OK) {
printf("libinputdriver: unable to get input endpoint (%d)\n",
r);
return; /* ignore message */
}
if (ep != m_ptr->m_source) {
printf("libinputdriver: ignoring CONF request from %u\n",
m_ptr->m_source);
return;
}
/* Save the new state. */
input_endpt = m_ptr->m_source;
kbd_id = m_ptr->m_input_linputdriver_input_conf.kbd_id;
mouse_id = m_ptr->m_input_linputdriver_input_conf.mouse_id;
/* If the input server is "full" there's nothing for us to do. */
if (kbd_id == INVALID_INPUT_ID && mouse_id == INVALID_INPUT_ID)
printf("libinputdriver: no IDs given, driver disabled\n");
}
/*
* The input server is telling us to change the LEDs to a particular mask.
* For now this is for keyboards only, so no device type is provided.
* This approach was chosen over sending toggle events for the individual LEDs
* for convenience reasons only.
*/
static void
do_setleds(struct inputdriver *idp, message *m_ptr)
{
unsigned int mask;
if (m_ptr->m_source != input_endpt) {
printf("libinputdriver: ignoring SETLEDS request from %u\n",
m_ptr->m_source);
return;
}
mask = m_ptr->m_input_linputdriver_setleds.led_mask;
if (idp->idr_leds)
idp->idr_leds(mask);
}
/*
* Call the appropriate driver function, based on the type of message.
* All messages in the input protocol are one-way, so we never send a reply.
*/
void
inputdriver_process(struct inputdriver *idp, message *m_ptr, int ipc_status)
{
/* Check for notifications first. */
if (is_ipc_notify(ipc_status)) {
switch (_ENDPOINT_P(m_ptr->m_source)) {
case HARDWARE:
if (idp->idr_intr)
idp->idr_intr(m_ptr->m_notify.interrupts);
break;
case CLOCK:
if (idp->idr_alarm)
idp->idr_alarm(m_ptr->m_notify.timestamp);
break;
default:
if (idp->idr_other)
idp->idr_other(m_ptr, ipc_status);
}
return;
}
switch (m_ptr->m_type) {
case INPUT_CONF: do_conf(m_ptr); break;
case INPUT_SETLEDS: do_setleds(idp, m_ptr); break;
default:
if (idp->idr_other)
idp->idr_other(m_ptr, ipc_status);
}
}
/*
* Break out of the main loop after finishing the current request.
*/
void
inputdriver_terminate(void)
{
running = FALSE;
sef_cancel();
}
/*
* Main program of any input driver task.
*/
void
inputdriver_task(struct inputdriver *idp)
{
message m;
int r, ipc_status;
running = TRUE;
while (running) {
if ((r = sef_receive_status(ANY, &m, &ipc_status)) != OK) {
if (r == EINTR && !running)
break;
panic("libinputdriver: receive failed: %d", r);
}
inputdriver_process(idp, &m, ipc_status);
}
}
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