tests/qtest: tmp105: cover the TMP75, TMP175 and LM75B variants

Exercise the per-variant differences added to the model: the TMP75 and
TMP175 fault-queue depths, the TMP75 alert-clear on thermostat-mode
change, and the LM75B's reserved config bits and fixed set-point and
temperature resolutions.

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-v2-9-1266926ba769@free.fr
Signed-off-by: Cédric Le Goater <clg@redhat.com>

1 files changed, 138 insertions, 0 deletions

diff --git a/tests/qtest/tmp105-test.c b/tests/qtest/tmp105-test.c
index 29a031fb7b..ea6803715a 100644
--- a/tests/qtest/tmp105-test.c
+++ b/tests/qtest/tmp105-test.c
@@ -19,9 +19,20 @@
 #define TMP105_TEST_ADDR 0x49
 #define TMP105_TEST_PATH "/machine/peripheral/" TMP105_TEST_ID
 
+#define TMP75_TEST_ID    "tmp75-test"
+#define TMP75_TEST_PATH  "/machine/peripheral/" TMP75_TEST_ID
+
+#define TMP175_TEST_ID   "tmp175-test"
+#define TMP175_TEST_PATH "/machine/peripheral/" TMP175_TEST_ID
+
+#define LM75B_TEST_ID    "lm75b-test"
+#define LM75B_TEST_PATH  "/machine/peripheral/" LM75B_TEST_ID
+
 #define TMP105_CONFIG_POL   (1 << 2)   /* ALERT active-high when set */
+#define TMP105_CONFIG_TM    (1 << 1)   /* interrupt (thermostat) mode */
 #define TMP105_CONFIG_FQ_1  (0 << 3)   /* fault queue: 1 consecutive fault */
 #define TMP105_CONFIG_FQ_4  (2 << 3)   /* fault queue: 4 consecutive faults */
+#define TMP105_CONFIG_FQ(f) ((f) << 3) /* raw F1:F0 fault-queue field value */
 
 static int qmp_tmp105_get_temperature(const char *id)
 {
@@ -166,6 +177,98 @@ static void test_fault_queue(void *obj, void *data, QGuestAllocator *alloc)
     g_assert_false(get_irq(0));
 }
 
+/*
+ * Drive @need consecutive over-limit conversions and check that the ALERT pin
+ * only asserts on the last one. This exercises the fault-queue length.
+ */
+static void check_fault_queue(QI2CDevice *i2cdev, const char *id,
+                              const char *path, uint8_t fq_field, int need)
+{
+    int i;
+
+    qtest_irq_intercept_out(global_qtest, path);
+
+    i2c_set8(i2cdev, TMP105_REG_CONFIG,
+             TMP105_CONFIG_POL | TMP105_CONFIG_FQ(fq_field));
+    g_assert_false(get_irq(0));
+
+    for (i = 0; i < need - 1; i++) {
+        qmp_tmp105_set_temperature(id, 85000);
+        g_assert_false(get_irq(0));
+    }
+    qmp_tmp105_set_temperature(id, 85000);
+    g_assert_true(get_irq(0));
+}
+
+/* The TMP75 maps F1:F0 = 10b to 3 consecutive faults. */
+static void test_tmp75_fault_queue(void *obj, void *data,
+                                   QGuestAllocator *alloc)
+{
+    check_fault_queue(obj, TMP75_TEST_ID, TMP75_TEST_PATH, 2, 3);
+}
+
+/* The TMP175 keeps the TMP105 mapping: F1:F0 = 10b means 4 faults. */
+static void test_tmp175_fault_queue(void *obj, void *data,
+                                    QGuestAllocator *alloc)
+{
+    check_fault_queue(obj, TMP175_TEST_ID, TMP175_TEST_PATH, 2, 4);
+}
+
+/*
+ * Toggling the thermostat mode (TM) bit clears any active alert on the TMP75.
+ */
+static void test_tmp75_tm_clears_alert(void *obj, void *data,
+                                       QGuestAllocator *alloc)
+{
+    QI2CDevice *i2cdev = (QI2CDevice *)obj;
+    int i;
+
+    qtest_irq_intercept_out(global_qtest, TMP75_TEST_PATH);
+
+    i2c_set8(i2cdev, TMP105_REG_CONFIG,
+             TMP105_CONFIG_POL | TMP105_CONFIG_FQ(3));
+    for (i = 0; i < 4; i++) {
+        qmp_tmp105_set_temperature(TMP75_TEST_ID, 85000);
+    }
+    g_assert_true(get_irq(0));
+
+    i2c_set8(i2cdev, TMP105_REG_CONFIG,
+             TMP105_CONFIG_POL | TMP105_CONFIG_FQ(3) | TMP105_CONFIG_TM);
+    g_assert_false(get_irq(0));
+}
+
+/*
+ * The LM75B has a fixed 11-bit (0.125 C) converter: the resolution and one-shot
+ * Config bits are reserved (read/write as zero) and the temperature register is
+ * always masked to 11 bits regardless of what is written to Config.
+ */
+static void test_lm75b_resolution(void *obj, void *data,
+                                  QGuestAllocator *alloc)
+{
+    QI2CDevice *i2cdev = (QI2CDevice *)obj;
+    uint16_t value;
+
+    i2c_set8(i2cdev, TMP105_REG_CONFIG, 0x60);
+    g_assert_cmphex(i2c_get8(i2cdev, TMP105_REG_CONFIG), ==, 0x00);
+
+    qmp_tmp105_set_temperature(LM75B_TEST_ID, 20938);
+    value = i2c_get16(i2cdev, TMP105_REG_TEMPERATURE);
+    g_assert_cmphex(value, ==, 0x14e0);
+}
+
+/* The LM75B set-point registers store only 9 bits. */
+static void test_lm75b_limits(void *obj, void *data,
+                              QGuestAllocator *alloc)
+{
+    QI2CDevice *i2cdev = (QI2CDevice *)obj;
+
+    i2c_set16(i2cdev, TMP105_REG_T_HIGH, 0x4231);
+    g_assert_cmphex(i2c_get16(i2cdev, TMP105_REG_T_HIGH), ==, 0x4200);
+
+    i2c_set16(i2cdev, TMP105_REG_T_LOW, 0x12b4);
+    g_assert_cmphex(i2c_get16(i2cdev, TMP105_REG_T_LOW), ==, 0x1280);
+}
+
 static void tmp105_register_nodes(void)
 {
     QOSGraphEdgeOptions opts = {
@@ -179,5 +282,40 @@ static void tmp105_register_nodes(void)
     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);
+
+    /* TMP75: register-compatible, but with a 1/2/3/4 fault queue. */
+    QOSGraphEdgeOptions tmp75_opts = {
+        .extra_device_opts = "id=" TMP75_TEST_ID ",address=0x48"
+    };
+    add_qi2c_address(&tmp75_opts, &(QI2CAddress) { 0x48 });
+
+    qos_node_create_driver("tmp75", i2c_device_create);
+    qos_node_consumes("tmp75", "i2c-bus", &tmp75_opts);
+
+    qos_add_test("fault-queue", "tmp75", test_tmp75_fault_queue, NULL);
+    qos_add_test("tm-clears-alert", "tmp75", test_tmp75_tm_clears_alert, NULL);
+
+    /* TMP175: like the TMP105, with a 1/2/4/6 fault queue. */
+    QOSGraphEdgeOptions tmp175_opts = {
+        .extra_device_opts = "id=" TMP175_TEST_ID ",address=0x4a"
+    };
+    add_qi2c_address(&tmp175_opts, &(QI2CAddress) { 0x4a });
+
+    qos_node_create_driver("tmp175", i2c_device_create);
+    qos_node_consumes("tmp175", "i2c-bus", &tmp175_opts);
+
+    qos_add_test("fault-queue", "tmp175", test_tmp175_fault_queue, NULL);
+
+    /* LM75B: fixed 11-bit conversion and 9-bit set-point registers. */
+    QOSGraphEdgeOptions lm75b_opts = {
+        .extra_device_opts = "id=" LM75B_TEST_ID ",address=0x4c"
+    };
+    add_qi2c_address(&lm75b_opts, &(QI2CAddress) { 0x4c });
+
+    qos_node_create_driver("lm75b", i2c_device_create);
+    qos_node_consumes("lm75b", "i2c-bus", &lm75b_opts);
+
+    qos_add_test("resolution", "lm75b", test_lm75b_resolution, NULL);
+    qos_add_test("limits", "lm75b", test_lm75b_limits, NULL);
 }
 libqos_init(tmp105_register_nodes);