board/io3.c: Tweak ADC polling interface

board/io3.c

@@ -481,7 +481,7 @@ static HRESULT io3_cmd_read_analogs(
         struct iobuf *resp_buf)
 {
     struct jvs_req_read_analogs req;
-    uint16_t state;
+    uint16_t analogs[8];
     uint8_t i;
     HRESULT hr;
 
@@ -493,6 +493,12 @@ static HRESULT io3_cmd_read_analogs(
         return hr;
     }
 
+    if (req.nanalogs > _countof(analogs)) {
+        dprintf("JVS I/O: Invalid analog count %i\n", req.nanalogs);
+
+        return E_FAIL;
+    }
+
     //dprintf("JVS I/O: Read analogs, nanalogs=%i\n", req.nanalogs);
 
     /* Write report byte */
@@ -505,14 +511,14 @@ static HRESULT io3_cmd_read_analogs(
 
     /* Write analogs */
 
-    for (i = 0 ; i < req.nanalogs ; i++) {
-        if (io3->ops->read_analog != NULL) {
-            state = io3->ops->read_analog(io3->ops_ctx, i);
-        } else {
-            state = 0;
-        }
+    memset(analogs, 0, sizeof(analogs));
 
-        hr = iobuf_write_be16(resp_buf, state);
+    if (io3->ops->read_analogs != NULL) {
+        io3->ops->read_analogs(io3->ops_ctx, analogs, req.nanalogs);
+    }
+
+    for (i = 0 ; i < req.nanalogs ; i++) {
+        hr = iobuf_write_be16(resp_buf, analogs[i]);
 
         if (FAILED(hr)) {
             return hr;

board/io3.h

@@ -17,7 +17,7 @@ struct io3_ops {
     void (*reset)(void *ctx);
     void (*write_gpio)(void *ctx, uint32_t state);
     void (*read_switches)(void *ctx, struct io3_switch_state *out);
-    uint16_t (*read_analog)(void *ctx, uint8_t analog_no);
+    void (*read_analogs)(void *ctx, uint16_t *analogs, uint8_t nanalogs);
     uint16_t (*read_coin_counter)(void *ctx, uint8_t slot_no);
 };
 

idzhook/jvs.c

@@ -17,13 +17,16 @@
 
 #include "util/dprintf.h"
 
+static void idz_jvs_read_analogs(
+        void *ctx,
+        uint16_t *analogs,
+        uint8_t nanalogs);
 static void idz_jvs_read_switches(void *ctx, struct io3_switch_state *out);
-static uint16_t idz_jvs_read_analog(void *ctx, uint8_t analog_no);
 static uint16_t idz_jvs_read_coin_counter(void *ctx, uint8_t slot_no);
 
 static const struct io3_ops idz_jvs_io3_ops = {
     .read_switches      = idz_jvs_read_switches,
-    .read_analog        = idz_jvs_read_analog,
+    .read_analogs       = idz_jvs_read_analogs,
     .read_coin_counter  = idz_jvs_read_coin_counter,
 };
 
@@ -127,23 +130,23 @@ static void idz_jvs_read_switches(void *ctx, struct io3_switch_state *out)
     }
 }
 
-static uint16_t idz_jvs_read_analog(void *ctx, uint8_t analog_no)
+static void idz_jvs_read_analogs(
+        void *ctx,
+        uint16_t *analogs,
+        uint8_t nanalogs)
 {
     XINPUT_STATE xi;
     int left;
     int right;
 
-    if (analog_no > 2) {
-        return 0;
-    }
+    assert(analogs != NULL);
 
     memset(&xi, 0, sizeof(xi));
     XInputGetState(0, &xi);
 
-    switch (analog_no) {
-    case 0:
-        /* Wheel */
+    /* Wheel */
 
+    if (nanalogs > 0) {
         left = xi.Gamepad.sThumbLX;
 
         if (left < -XINPUT_GAMEPAD_LEFT_THUMB_DEADZONE) {
@@ -164,18 +167,19 @@ static uint16_t idz_jvs_read_analog(void *ctx, uint8_t analog_no)
             right = 0;
         }
 
-        return 0x8000 + (left + right) / 2;
+        analogs[0] = 0x8000 + (left + right) / 2;
+    }
 
-    case 1:
-        /* Accel */
-        return xi.Gamepad.bRightTrigger << 8;
+    /* Accel */
 
-    case 2:
-        /* Brake */
-        return xi.Gamepad.bLeftTrigger << 8;
+    if (nanalogs > 1) {
+        analogs[1] = xi.Gamepad.bRightTrigger << 8;
+    }
 
-    default:
-        return 0;
+    /* Brake */
+
+    if (nanalogs > 2) {
+        analogs[2] = xi.Gamepad.bLeftTrigger << 8;
     }
 }