tests/qtest: tmp105: cover the ALERT fault queue

Add two qgraph tests exercising the ALERT pin, the only way the TMP105
exposes its alarm state. One checks the default single-fault behaviour;
the other checks a deeper fault queue, including the running-count reset
on an in-range conversion and its effect on both asserting and releasing
the alarm.

Signed-off-by: Emmanuel Blot <emmanuel.blot@free.fr>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/qemu-devel/20260731-sanmiguel-bmc-locator-v2-8-1266926ba769@free.fr
Signed-off-by: Cédric Le Goater <clg@redhat.com>

1 files changed, 63 insertions, 0 deletions

diff --git a/tests/qtest/tmp105-test.c b/tests/qtest/tmp105-test.c
index 3b114a50f5..29a031fb7b 100644
--- a/tests/qtest/tmp105-test.c
+++ b/tests/qtest/tmp105-test.c
@@ -17,6 +17,11 @@
 
 #define TMP105_TEST_ID   "tmp105-test"
 #define TMP105_TEST_ADDR 0x49
+#define TMP105_TEST_PATH "/machine/peripheral/" TMP105_TEST_ID
+
+#define TMP105_CONFIG_POL   (1 << 2)   /* ALERT active-high when set */
+#define TMP105_CONFIG_FQ_1  (0 << 3)   /* fault queue: 1 consecutive fault */
+#define TMP105_CONFIG_FQ_4  (2 << 3)   /* fault queue: 4 consecutive faults */
 
 static int qmp_tmp105_get_temperature(const char *id)
 {
@@ -105,6 +110,62 @@ static void send_and_receive(void *obj, void *data, QGuestAllocator *alloc)
     g_assert_cmphex(i2c_get16(i2cdev, TMP105_REG_T_HIGH), ==, 0x4230);
 }
 
+/*
+ * The TMP105 exposes its alarm state only through the ALERT pin.
+ */
+static void test_alert_single_fault(void *obj, void *data,
+                                    QGuestAllocator *alloc)
+{
+    QI2CDevice *i2cdev = (QI2CDevice *)obj;
+
+    qtest_irq_intercept_out(global_qtest, TMP105_TEST_PATH);
+
+    i2c_set8(i2cdev, TMP105_REG_CONFIG, TMP105_CONFIG_POL | TMP105_CONFIG_FQ_1);
+    g_assert_false(get_irq(0));
+
+    qmp_tmp105_set_temperature(TMP105_TEST_ID, 85000);
+    g_assert_true(get_irq(0));
+
+    qmp_tmp105_set_temperature(TMP105_TEST_ID, 70000);
+    g_assert_false(get_irq(0));
+}
+
+static void test_fault_queue(void *obj, void *data, QGuestAllocator *alloc)
+{
+    QI2CDevice *i2cdev = (QI2CDevice *)obj;
+    int i;
+
+    qtest_irq_intercept_out(global_qtest, TMP105_TEST_PATH);
+
+    /* Comparator mode, active-high ALERT, fault queue of four. */
+    i2c_set8(i2cdev, TMP105_REG_CONFIG, TMP105_CONFIG_POL | TMP105_CONFIG_FQ_4);
+    g_assert_false(get_irq(0));
+
+    for (i = 0; i < 3; i++) {
+        qmp_tmp105_set_temperature(TMP105_TEST_ID, 85000);
+        g_assert_false(get_irq(0));
+    }
+
+    qmp_tmp105_set_temperature(TMP105_TEST_ID, 25000);
+    g_assert_false(get_irq(0));
+
+    for (i = 0; i < 3; i++) {
+        qmp_tmp105_set_temperature(TMP105_TEST_ID, 85000);
+        g_assert_false(get_irq(0));
+    }
+
+    qmp_tmp105_set_temperature(TMP105_TEST_ID, 85000);
+    g_assert_true(get_irq(0));
+
+    for (i = 0; i < 3; i++) {
+        qmp_tmp105_set_temperature(TMP105_TEST_ID, 70000);
+        g_assert_true(get_irq(0));
+    }
+
+    qmp_tmp105_set_temperature(TMP105_TEST_ID, 70000);
+    g_assert_false(get_irq(0));
+}
+
 static void tmp105_register_nodes(void)
 {
     QOSGraphEdgeOptions opts = {
@@ -116,5 +177,7 @@ static void tmp105_register_nodes(void)
     qos_node_consumes("tmp105", "i2c-bus", &opts);
 
     qos_add_test("tx-rx", "tmp105", send_and_receive, NULL);
+    qos_add_test("alert-single-fault", "tmp105", test_alert_single_fault, NULL);
+    qos_add_test("fault-queue", "tmp105", test_fault_queue, NULL);
 }
 libqos_init(tmp105_register_nodes);