lsm303dlhc-mag-test.c (5428B)
1 /* 2 * QTest testcase for the LSM303DLHC I2C magnetometer 3 * 4 * Copyright (C) 2021 Linaro Ltd. 5 * Written by Kevin Townsend <kevin.townsend@linaro.org> 6 * 7 * Based on: https://www.st.com/resource/en/datasheet/lsm303dlhc.pdf 8 * 9 * SPDX-License-Identifier: GPL-2.0-or-later 10 */ 11 12 #include "qemu/osdep.h" 13 #include "libqtest-single.h" 14 #include "libqos/qgraph.h" 15 #include "libqos/i2c.h" 16 #include "qapi/qmp/qdict.h" 17 18 #define LSM303DLHC_MAG_TEST_ID "lsm303dlhc_mag-test" 19 #define LSM303DLHC_MAG_REG_CRA 0x00 20 #define LSM303DLHC_MAG_REG_CRB 0x01 21 #define LSM303DLHC_MAG_REG_OUT_X_H 0x03 22 #define LSM303DLHC_MAG_REG_OUT_Z_H 0x05 23 #define LSM303DLHC_MAG_REG_OUT_Y_H 0x07 24 #define LSM303DLHC_MAG_REG_IRC 0x0C 25 #define LSM303DLHC_MAG_REG_TEMP_OUT_H 0x31 26 27 static int qmp_lsm303dlhc_mag_get_property(const char *id, const char *prop) 28 { 29 QDict *response; 30 int ret; 31 32 response = qmp("{ 'execute': 'qom-get', 'arguments': { 'path': %s, " 33 "'property': %s } }", id, prop); 34 g_assert(qdict_haskey(response, "return")); 35 ret = qdict_get_int(response, "return"); 36 qobject_unref(response); 37 return ret; 38 } 39 40 static void qmp_lsm303dlhc_mag_set_property(const char *id, const char *prop, 41 int value) 42 { 43 QDict *response; 44 45 response = qmp("{ 'execute': 'qom-set', 'arguments': { 'path': %s, " 46 "'property': %s, 'value': %d } }", id, prop, value); 47 g_assert(qdict_haskey(response, "return")); 48 qobject_unref(response); 49 } 50 51 static void send_and_receive(void *obj, void *data, QGuestAllocator *alloc) 52 { 53 int64_t value; 54 QI2CDevice *i2cdev = (QI2CDevice *)obj; 55 56 /* Check default value for CRB */ 57 g_assert_cmphex(i2c_get8(i2cdev, LSM303DLHC_MAG_REG_CRB), ==, 0x20); 58 59 /* Set x to 1.0 gauss and verify the value */ 60 qmp_lsm303dlhc_mag_set_property(LSM303DLHC_MAG_TEST_ID, "mag-x", 100000); 61 value = qmp_lsm303dlhc_mag_get_property( 62 LSM303DLHC_MAG_TEST_ID, "mag-x"); 63 g_assert_cmpint(value, ==, 100000); 64 65 /* Set y to 1.5 gauss and verify the value */ 66 qmp_lsm303dlhc_mag_set_property(LSM303DLHC_MAG_TEST_ID, "mag-y", 150000); 67 value = qmp_lsm303dlhc_mag_get_property( 68 LSM303DLHC_MAG_TEST_ID, "mag-y"); 69 g_assert_cmpint(value, ==, 150000); 70 71 /* Set z to 0.5 gauss and verify the value */ 72 qmp_lsm303dlhc_mag_set_property(LSM303DLHC_MAG_TEST_ID, "mag-z", 50000); 73 value = qmp_lsm303dlhc_mag_get_property( 74 LSM303DLHC_MAG_TEST_ID, "mag-z"); 75 g_assert_cmpint(value, ==, 50000); 76 77 /* Set temperature to 23.6 C and verify the value */ 78 qmp_lsm303dlhc_mag_set_property(LSM303DLHC_MAG_TEST_ID, 79 "temperature", 23600); 80 value = qmp_lsm303dlhc_mag_get_property( 81 LSM303DLHC_MAG_TEST_ID, "temperature"); 82 /* Should return 23.5 C due to 0.125°C steps. */ 83 g_assert_cmpint(value, ==, 23500); 84 85 /* Read raw x axis registers (1 gauss = 1100 at +/-1.3 g gain) */ 86 value = i2c_get16(i2cdev, LSM303DLHC_MAG_REG_OUT_X_H); 87 g_assert_cmphex(value, ==, 1100); 88 89 /* Read raw y axis registers (1.5 gauss = 1650 at +/- 1.3 g gain = ) */ 90 value = i2c_get16(i2cdev, LSM303DLHC_MAG_REG_OUT_Y_H); 91 g_assert_cmphex(value, ==, 1650); 92 93 /* Read raw z axis registers (0.5 gauss = 490 at +/- 1.3 g gain = ) */ 94 value = i2c_get16(i2cdev, LSM303DLHC_MAG_REG_OUT_Z_H); 95 g_assert_cmphex(value, ==, 490); 96 97 /* Read raw temperature registers with temp disabled (CRA = 0x10) */ 98 value = i2c_get16(i2cdev, LSM303DLHC_MAG_REG_TEMP_OUT_H); 99 g_assert_cmphex(value, ==, 0); 100 101 /* Enable temperature reads (CRA = 0x90) */ 102 i2c_set8(i2cdev, LSM303DLHC_MAG_REG_CRA, 0x90); 103 104 /* Read raw temp registers (23.5 C = 188 at 1 lsb = 0.125 C) */ 105 value = i2c_get16(i2cdev, LSM303DLHC_MAG_REG_TEMP_OUT_H); 106 g_assert_cmphex(value, ==, 188); 107 } 108 109 static void reg_wraparound(void *obj, void *data, QGuestAllocator *alloc) 110 { 111 uint8_t value[4]; 112 QI2CDevice *i2cdev = (QI2CDevice *)obj; 113 114 /* Set x to 1.0 gauss, and y to 1.5 gauss for known test values */ 115 qmp_lsm303dlhc_mag_set_property(LSM303DLHC_MAG_TEST_ID, "mag-x", 100000); 116 qmp_lsm303dlhc_mag_set_property(LSM303DLHC_MAG_TEST_ID, "mag-y", 150000); 117 118 /* Check that requesting 4 bytes starting at Y_H wraps around to X_L */ 119 i2c_read_block(i2cdev, LSM303DLHC_MAG_REG_OUT_Y_H, value, 4); 120 /* 1.5 gauss = 1650 lsb = 0x672 */ 121 g_assert_cmphex(value[0], ==, 0x06); 122 g_assert_cmphex(value[1], ==, 0x72); 123 /* 1.0 gauss = 1100 lsb = 0x44C */ 124 g_assert_cmphex(value[2], ==, 0x04); 125 g_assert_cmphex(value[3], ==, 0x4C); 126 127 /* Check that requesting LSM303DLHC_MAG_REG_IRC wraps around to CRA */ 128 i2c_read_block(i2cdev, LSM303DLHC_MAG_REG_IRC, value, 2); 129 /* Default value for IRC = 0x33 */ 130 g_assert_cmphex(value[0], ==, 0x33); 131 /* Default value for CRA = 0x10 */ 132 g_assert_cmphex(value[1], ==, 0x10); 133 } 134 135 static void lsm303dlhc_mag_register_nodes(void) 136 { 137 QOSGraphEdgeOptions opts = { 138 .extra_device_opts = "id=" LSM303DLHC_MAG_TEST_ID ",address=0x1e" 139 }; 140 add_qi2c_address(&opts, &(QI2CAddress) { 0x1E }); 141 142 qos_node_create_driver("lsm303dlhc_mag", i2c_device_create); 143 qos_node_consumes("lsm303dlhc_mag", "i2c-bus", &opts); 144 145 qos_add_test("tx-rx", "lsm303dlhc_mag", send_and_receive, NULL); 146 qos_add_test("regwrap", "lsm303dlhc_mag", reg_wraparound, NULL); 147 } 148 libqos_init(lsm303dlhc_mag_register_nodes);