Signed-off-by: Titus Rwantare
Reviewed-by: Hao Wu
---
tests/qtest/max31790_fan_ctrl-test.c | 171 +++
tests/qtest/meson.build | 1 +
2 files changed, 172 insertions(+)
create mode 100644 tests/qtest/max31790_fan_ctrl-test.c
diff --git a/tests/qtest/max31790_fan_ctrl-test.c
b/tests/qtest/max31790_fan_ctrl-test.c
new file mode 100644
index 00..b0b703d018
--- /dev/null
+++ b/tests/qtest/max31790_fan_ctrl-test.c
@@ -0,0 +1,171 @@
+/*
+ * QTests for MAX31790 Fan controller
+ *
+ * Independently control 6 fans, up to 12 tachometer inputs,
+ * controlled through i2c
+ *
+ * Copyright 2021 Google LLC
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include "qemu/osdep.h"
+#include
+#include "hw/sensor/max31790_fan_ctrl.h"
+#include "libqtest-single.h"
+#include "libqos/qgraph.h"
+#include "libqos/i2c.h"
+#include "qapi/qmp/qdict.h"
+#include "qapi/qmp/qnum.h"
+#include "qemu/bitops.h"
+
+#define TEST_ID "max31790-test"
+#define TEST_ADDR (0x37)
+#define TEST_MAX_RPM0x4000
+
+static uint16_t qmp_max31790_get(const char *id, const char *property)
+{
+QDict *response;
+uint64_t ret;
+
+response = qmp("{ 'execute': 'qom-get', 'arguments': { 'path': %s, "
+ "'property': %s } }", id, property);
+g_assert(qdict_haskey(response, "return"));
+ret = qnum_get_uint(qobject_to(QNum, qdict_get(response, "return")));
+qobject_unref(response);
+return ret;
+}
+
+static void qmp_max31790_set(const char *id,
+const char *property,
+uint16_t value)
+{
+QDict *response;
+
+response = qmp("{ 'execute': 'qom-set', 'arguments': { 'path': %s, "
+ "'property': %s, 'value': %u } }", id, property, value);
+g_assert(qdict_haskey(response, "return"));
+qobject_unref(response);
+}
+
+static uint32_t max31790_tach_count2rpm(uint16_t tach, uint8_t sr)
+{
+if (tach) {
+return (sr * MAX31790_CLK_FREQ * 60) / (MAX31790_PULSES_PER_REV *
tach);
+} else {
+return 0;
+}
+}
+
+/* R/W Tach - 6 fans */
+static void test_defaults(void *obj, void *data, QGuestAllocator *alloc)
+{
+QI2CDevice *i2cdev = (QI2CDevice *)obj;
+uint8_t i2c_value;
+
+i2c_value = i2c_get8(i2cdev, MAX31790_REG_GLOBAL_CONFIG);
+g_assert_cmphex(i2c_value, ==, MAX31790_GLOBAL_CONFIG_DEFAULT);
+
+i2c_value = i2c_get8(i2cdev, MAX31790_REG_PWM_FREQ);
+g_assert_cmphex(i2c_value, ==, MAX31790_PWM_FREQ_DEFAULT);
+
+for (int i = 0; i < MAX31790_NUM_FANS; i++) {
+i2c_value = i2c_get8(i2cdev, MAX31790_REG_FAN_DYNAMICS(i));
+g_assert_cmphex(i2c_value, ==, MAX31790_FAN_DYNAMICS_DEFAULT);
+}
+
+i2c_value = i2c_get8(i2cdev, MAX31790_REG_FAILED_FAN_OPTS_SEQ_STRT);
+g_assert_cmphex(i2c_value, ==, MAX31790_FAILED_FAN_OPTS_SEQ_STRT_DEFAULT);
+}
+
+static void test_pwm(void *obj, void *data, QGuestAllocator *alloc)
+{
+QI2CDevice *i2cdev = (QI2CDevice *)obj;
+char *path;
+int err;
+uint16_t i2c_value, value, rpm;
+
+
+/* init fans to different pwm duty cycles */
+for (int i = 0; i < MAX31790_NUM_FANS; i++) {
+path = g_strdup_printf("max_rpm[%d]", i);
+qmp_max31790_set(TEST_ID, path, TEST_MAX_RPM); /* ~16k RPM */
+g_free(path);
+i2c_set8(i2cdev, MAX31790_REG_FAN_CONFIG(i), 0); /* enable PWM mode */
+path = g_strdup_printf("pwm[%d]", i);
+qmp_max31790_set(TEST_ID, path, i * 0x40);
+g_free(path);
+}
+
+/* read and compare qmp with i2c 9-bit pwm */
+for (int i = 0; i < MAX31790_NUM_FANS; i++) {
+path = g_strdup_printf("pwm[%d]", i);
+value = qmp_max31790_get(TEST_ID, path);
+g_free(path);
+i2c_value = i2c_get8(i2cdev, MAX31790_REG_PWMOUT_MSB(i)) << 8;
+i2c_value |= i2c_get8(i2cdev, MAX31790_REG_PWMOUT_LSB(i));
+i2c_value >>= MAX31790_PWM_SHAMT;
+g_assert_cmphex(value, ==, i2c_value);
+}
+
+/* expect tach to match pwm scaled to max_rpm */
+for (int i = 0; i < MAX31790_NUM_FANS; i++) {
+i2c_value = i2c_get8(i2cdev, MAX31790_REG_TACH_COUNT_MSB(i)) << 8;
+i2c_value |= i2c_get8(i2cdev, MAX31790_REG_TACH_COUNT_LSB(i));
+i2c_value >>= 5;
+value = max31790_tach_count2rpm(i2c_value, MAX31790_SR_DEFAULT);
+rpm = (TEST_MAX_RPM * i * 0x40) / 0x1FF; /* max_rpm x pwm_duty_cycle */
+err = value - rpm;
+g_assert_cmpuint(abs(err), <, 163); /* ~1% of max_rpm */
+}
+}
+
+static void test_rpm(void *obj, void *data, QGuestAllocator *alloc)
+{
+QI2CDevice *i2cdev = (QI2CDevice *)obj;
+char *path;
+int err;
+uint16_t i2c_value, value, rpm;
+
+/* init fans to different speeds */
+for (int i = 0; i < MAX31790_NUM_FANS; i++) {
+i2c_set8(i2cdev, MAX31790_REG_FAN_CONFIG(i),
+ MAX31790_FAN_CFG_RPM_MODE);
+path = g_strdup_printf("target_rpm[%d]", i);
+
