Jan Dabros | b0800d3 | 2020-05-06 16:01:27 +0200 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
Jan Dabros | a67cc5f | 2020-04-20 14:34:16 +0200 | [diff] [blame] | 2 | |
| 3 | #include <stdarg.h> |
| 4 | #include <stddef.h> |
| 5 | #include <setjmp.h> |
| 6 | #include <limits.h> |
| 7 | #include <cmocka.h> |
| 8 | |
| 9 | #include <device/i2c_simple.h> |
| 10 | |
| 11 | /* Simulate two i2c devices, both on bus 0, each with three uint8_t regs |
| 12 | implemented. */ |
| 13 | typedef struct { |
| 14 | uint8_t reg; |
| 15 | uint8_t data; |
| 16 | } i2c_ex_regs_t; |
| 17 | |
| 18 | typedef struct { |
| 19 | unsigned int bus; |
| 20 | uint8_t slave; |
| 21 | i2c_ex_regs_t regs[3]; |
| 22 | } i2c_ex_devs_t; |
| 23 | |
| 24 | i2c_ex_devs_t i2c_ex_devs[] = { |
| 25 | {.bus = 0, .slave = 0xA, .regs = { |
| 26 | {.reg = 0x0, .data = 0xB}, |
| 27 | {.reg = 0x1, .data = 0x6}, |
| 28 | {.reg = 0x2, .data = 0xF}, |
| 29 | } }, |
| 30 | {.bus = 0, .slave = 0x3, .regs = { |
| 31 | {.reg = 0x0, .data = 0xDE}, |
| 32 | {.reg = 0x1, .data = 0xAD}, |
| 33 | {.reg = 0x2, .data = 0xBE}, |
| 34 | } }, |
| 35 | }; |
| 36 | |
| 37 | int __wrap_platform_i2c_transfer(unsigned int bus, struct i2c_msg *segments, |
| 38 | int count) |
| 39 | { |
| 40 | int i; |
| 41 | int reg; |
| 42 | struct i2c_msg *tmp = segments; |
| 43 | i2c_ex_devs_t *i2c_dev = NULL; |
| 44 | |
| 45 | check_expected(count); |
| 46 | |
| 47 | for (i = 0; i < count; i++, segments++) { |
| 48 | check_expected_ptr(segments->buf); |
| 49 | check_expected(segments->flags); |
| 50 | } |
| 51 | |
| 52 | reg = tmp->buf[0]; |
| 53 | |
| 54 | /* Find object for requested device */ |
| 55 | for (i = 0; i < ARRAY_SIZE(i2c_ex_devs); i++, i2c_dev++) |
| 56 | if (i2c_ex_devs[i].slave == tmp->slave) { |
| 57 | i2c_dev = &i2c_ex_devs[i]; |
| 58 | break; |
| 59 | } |
| 60 | |
| 61 | if (i2c_dev == NULL) |
| 62 | return -1; |
| 63 | |
| 64 | /* Write commands */ |
| 65 | if (tmp->len > 1) { |
| 66 | i2c_dev->regs[reg].data = tmp->buf[1]; |
| 67 | }; |
| 68 | |
| 69 | /* Read commands */ |
| 70 | for (i = 0; i < count; i++, tmp++) |
| 71 | if (tmp->flags & I2C_M_RD) { |
| 72 | *(tmp->buf) = i2c_dev->regs[reg].data; |
| 73 | }; |
| 74 | } |
| 75 | |
| 76 | static void mock_expect_params_platform_i2c_transfer(void) |
| 77 | { |
| 78 | unsigned long int expected_flags[] = {0, I2C_M_RD, I2C_M_TEN, |
| 79 | I2C_M_RECV_LEN, I2C_M_NOSTART}; |
| 80 | |
| 81 | /* Flags should always be only within supported range */ |
| 82 | expect_in_set_count(__wrap_platform_i2c_transfer, segments->flags, |
| 83 | expected_flags, -1); |
| 84 | |
| 85 | expect_not_value_count(__wrap_platform_i2c_transfer, segments->buf, |
| 86 | NULL, -1); |
| 87 | |
| 88 | expect_in_range_count(__wrap_platform_i2c_transfer, count, 1, INT_MAX, |
| 89 | -1); |
| 90 | } |
| 91 | |
| 92 | #define MASK 0x3 |
| 93 | #define SHIFT 0x1 |
| 94 | |
| 95 | static void i2c_read_field_test(void **state) |
| 96 | { |
| 97 | int bus, slave, reg; |
| 98 | int i, j; |
| 99 | uint8_t buf; |
| 100 | |
| 101 | mock_expect_params_platform_i2c_transfer(); |
| 102 | |
| 103 | /* Read particular bits in all registers in all devices, then compare |
| 104 | with expected value. */ |
| 105 | for (i = 0; i < ARRAY_SIZE(i2c_ex_devs); i++) |
| 106 | for (j = 0; j < ARRAY_SIZE(i2c_ex_devs[0].regs); j++) { |
| 107 | i2c_read_field(i2c_ex_devs[i].bus, |
| 108 | i2c_ex_devs[i].slave, |
| 109 | i2c_ex_devs[i].regs[j].reg, |
| 110 | &buf, MASK, SHIFT); |
| 111 | assert_int_equal((i2c_ex_devs[i].regs[j].data & |
| 112 | (MASK << SHIFT)) >> SHIFT, buf); |
| 113 | }; |
| 114 | |
| 115 | /* Read whole registers */ |
| 116 | for (i = 0; i < ARRAY_SIZE(i2c_ex_devs); i++) |
| 117 | for (j = 0; j < ARRAY_SIZE(i2c_ex_devs[0].regs); j++) { |
| 118 | i2c_read_field(i2c_ex_devs[i].bus, |
| 119 | i2c_ex_devs[i].slave, |
| 120 | i2c_ex_devs[i].regs[j].reg, |
| 121 | &buf, 0xFF, 0); |
| 122 | assert_int_equal(i2c_ex_devs[i].regs[j].data, buf); |
| 123 | }; |
| 124 | } |
| 125 | |
| 126 | static void i2c_write_field_test(void **state) |
| 127 | { |
| 128 | int bus, slave, reg; |
| 129 | int i, j; |
| 130 | uint8_t buf, tmp; |
| 131 | |
| 132 | mock_expect_params_platform_i2c_transfer(); |
| 133 | |
| 134 | /* Clear particular bits in all registers in all devices, then compare |
| 135 | with expected value. */ |
| 136 | for (i = 0; i < ARRAY_SIZE(i2c_ex_devs); i++) |
| 137 | for (j = 0; j < ARRAY_SIZE(i2c_ex_devs[0].regs); j++) { |
| 138 | buf = 0x0; |
| 139 | tmp = i2c_ex_devs[i].regs[j].data; |
| 140 | i2c_write_field(i2c_ex_devs[i].bus, |
| 141 | i2c_ex_devs[i].slave, |
| 142 | i2c_ex_devs[i].regs[j].reg, |
| 143 | buf, MASK, SHIFT); |
| 144 | assert_int_equal(i2c_ex_devs[i].regs[j].data, |
| 145 | (tmp & ~(MASK << SHIFT)) | (buf << SHIFT)); |
| 146 | }; |
| 147 | |
| 148 | /* Set all bits in all registers, this time verify using |
| 149 | i2c_read_field() accessor. */ |
| 150 | for (i = 0; i < ARRAY_SIZE(i2c_ex_devs); i++) |
| 151 | for (j = 0; j < ARRAY_SIZE(i2c_ex_devs[0].regs); j++) { |
| 152 | i2c_write_field(i2c_ex_devs[i].bus, |
| 153 | i2c_ex_devs[i].slave, |
| 154 | i2c_ex_devs[i].regs[j].reg, |
| 155 | 0xFF, 0xFF, 0); |
| 156 | i2c_read_field(i2c_ex_devs[i].bus, |
| 157 | i2c_ex_devs[i].slave, |
| 158 | i2c_ex_devs[i].regs[j].reg, |
| 159 | &buf, 0xFF, 0); |
| 160 | assert_int_equal(buf, 0xFF); |
| 161 | }; |
| 162 | } |
| 163 | |
| 164 | int main(void) |
| 165 | { |
| 166 | const struct CMUnitTest tests[] = { |
| 167 | cmocka_unit_test(i2c_read_field_test), |
| 168 | cmocka_unit_test(i2c_write_field_test) |
| 169 | }; |
| 170 | |
| 171 | return cmocka_run_group_tests(tests, NULL, NULL); |
| 172 | } |