mraa mock: Add SPI functionality

Signed-off-by: Alex Tereschenko <alext.mkrs@gmail.com>
Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>

src/CMakeLists.txt

@@ -90,6 +90,7 @@ set (mraa_LIB_MOCK_SRCS_NOAUTO
   ${PROJECT_SOURCE_DIR}/src/mock/mock_board_gpio.c
   ${PROJECT_SOURCE_DIR}/src/mock/mock_board_aio.c
   ${PROJECT_SOURCE_DIR}/src/mock/mock_board_i2c.c
+  ${PROJECT_SOURCE_DIR}/src/mock/mock_board_spi.c
 )
 
 if (JSONPLAT)

src/mock/mock_board.c

@@ -30,6 +30,7 @@
 #include "mock/mock_board_gpio.h"
 #include "mock/mock_board_aio.h"
 #include "mock/mock_board_i2c.h"
+#include "mock/mock_board_spi.h"
 
 #define PLATFORM_NAME "MRAA mock platform"
 
@@ -55,7 +56,14 @@ mraa_mock_board()
     b->i2c_bus[0].scl = 3;
     b->def_i2c_bus = b->i2c_bus[0].bus_id;
 
-    b->spi_bus_count = 0;
+    b->spi_bus_count = 1;
+    b->def_spi_bus = 0;
+    b->spi_bus[0].bus_id = 0;
+    b->spi_bus[0].slave_s = 0;
+    b->spi_bus[0].cs = 4;
+    b->spi_bus[0].mosi = 5;
+    b->spi_bus[0].miso = 6;
+    b->spi_bus[0].sclk = 7;
 
     b->pwm_default_period = 0;
     b->pwm_max_period = 0;
@@ -99,6 +107,16 @@ mraa_mock_board()
     b->adv_func->i2c_write_byte_replace = &mraa_mock_i2c_write_byte_replace;
     b->adv_func->i2c_write_byte_data_replace = &mraa_mock_i2c_write_byte_data_replace;
     b->adv_func->i2c_write_word_data_replace = &mraa_mock_i2c_write_word_data_replace;
+    b->adv_func->spi_init_raw_replace = &mraa_mock_spi_init_raw_replace;
+    b->adv_func->spi_stop_replace = &mraa_mock_spi_stop_replace;
+    b->adv_func->spi_bit_per_word_replace = &mraa_mock_spi_bit_per_word_replace;
+    b->adv_func->spi_lsbmode_replace = &mraa_mock_spi_lsbmode_replace;
+    b->adv_func->spi_mode_replace = &mraa_mock_spi_mode_replace;
+    b->adv_func->spi_frequency_replace = &mraa_mock_spi_frequency_replace;
+    b->adv_func->spi_write_replace = &mraa_mock_spi_write_replace;
+    b->adv_func->spi_write_word_replace = &mraa_mock_spi_write_word_replace;
+    b->adv_func->spi_transfer_buf_replace = &mraa_mock_spi_transfer_buf_replace;
+    b->adv_func->spi_transfer_buf_word_replace = &mraa_mock_spi_transfer_buf_word_replace;
 
     // Pin definitions
     int pos = 0;
@@ -127,6 +145,30 @@ mraa_mock_board()
     b->pins[pos].i2c.pinmap = 0;
     pos++;
 
+    strncpy(b->pins[pos].name, "SPI0CS", 8);
+    b->pins[pos].capabilities = (mraa_pincapabilities_t){ 1, 0, 0, 0, 1, 0, 0, 0 };
+    b->pins[pos].spi.mux_total = 0;
+    b->pins[pos].spi.pinmap = 0;
+    pos++;
+
+    strncpy(b->pins[pos].name, "SPI0MOSI", 8);
+    b->pins[pos].capabilities = (mraa_pincapabilities_t){ 1, 0, 0, 0, 1, 0, 0, 0 };
+    b->pins[pos].spi.mux_total = 0;
+    b->pins[pos].spi.pinmap = 0;
+    pos++;
+
+    strncpy(b->pins[pos].name, "SPI0MISO", 8);
+    b->pins[pos].capabilities = (mraa_pincapabilities_t){ 1, 0, 0, 0, 1, 0, 0, 0 };
+    b->pins[pos].spi.mux_total = 0;
+    b->pins[pos].spi.pinmap = 0;
+    pos++;
+
+    strncpy(b->pins[pos].name, "SPI0SCLK", 8);
+    b->pins[pos].capabilities = (mraa_pincapabilities_t){ 1, 0, 0, 0, 1, 0, 0, 0 };
+    b->pins[pos].spi.mux_total = 0;
+    b->pins[pos].spi.pinmap = 0;
+    pos++;
+
     return b;
 
 error:

src/mock/mock_board_spi.c

@@ -0,0 +1,177 @@
+/*
+ * Author: Alex Tereschenko <alext.mkrs@gmail.com>
+ * Copyright (c) 2016 Alex Tereschenko.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include <stdlib.h>
+#include <string.h>
+
+#if defined(MSYS)
+#define __USE_LINUX_IOCTL_DEFS
+#endif
+#include <sys/ioctl.h>
+#if defined(MSYS)
+// There's no spidev.h on MSYS, so we need to provide our own,
+// and only *after* including ioctl.h as that one contains prerequisites.
+#include "linux/spi_kernel_headers.h"
+#else
+#include <linux/spi/spidev.h>
+#endif
+
+#include "common.h"
+#include "mock/mock_board_spi.h"
+
+mraa_result_t
+mraa_mock_spi_init_raw_replace(mraa_spi_context dev, unsigned int bus, unsigned int cs)
+{
+    dev->clock = MOCK_SPI_DEFAULT_FREQ;
+
+    if ((mraa_spi_mode(dev, MOCK_SPI_DEFAULT_MODE) != MRAA_SUCCESS) ||
+        (mraa_spi_lsbmode(dev, MOCK_SPI_DEFAULT_LSBMODE) != MRAA_SUCCESS) ||
+        (mraa_spi_bit_per_word(dev, MOCK_SPI_DEFAULT_BIT_PER_WORD) != MRAA_SUCCESS)) {
+        return MRAA_ERROR_INVALID_RESOURCE;
+    }
+
+    return MRAA_SUCCESS;
+}
+
+mraa_result_t
+mraa_mock_spi_stop_replace(mraa_spi_context dev)
+{
+    free(dev);
+    return MRAA_SUCCESS;
+}
+
+mraa_result_t
+mraa_mock_spi_bit_per_word_replace(mraa_spi_context dev, unsigned int bits)
+{
+    if (bits == 0) {
+        syslog(LOG_ERR, "spi: bit_per_word: Cannot set to zero");
+        return MRAA_ERROR_INVALID_PARAMETER;
+    }
+
+    dev->bpw = bits;
+    return MRAA_SUCCESS;
+}
+
+mraa_result_t
+mraa_mock_spi_lsbmode_replace(mraa_spi_context dev, mraa_boolean_t lsb)
+{
+    dev->lsb = lsb;
+    return MRAA_SUCCESS;
+}
+
+mraa_result_t
+mraa_mock_spi_mode_replace(mraa_spi_context dev, mraa_spi_mode_t mode)
+{
+    uint8_t spi_mode = 0;
+
+    switch (mode) {
+    case MRAA_SPI_MODE0:
+        spi_mode = SPI_MODE_0;
+        break;
+    case MRAA_SPI_MODE1:
+        spi_mode = SPI_MODE_1;
+        break;
+    case MRAA_SPI_MODE2:
+        spi_mode = SPI_MODE_2;
+        break;
+    case MRAA_SPI_MODE3:
+        spi_mode = SPI_MODE_3;
+        break;
+    default:
+        syslog(LOG_ERR, "spi: mode: Invalid SPI mode selected", mode);
+        return MRAA_ERROR_INVALID_PARAMETER;
+    }
+
+    dev->mode = spi_mode;
+    return MRAA_SUCCESS;
+}
+
+mraa_result_t
+mraa_mock_spi_frequency_replace(mraa_spi_context dev, int hz)
+{
+    if (hz <= 0) {
+        syslog(LOG_ERR, "spi: frequency: Cannot set to zero or negative");
+        return MRAA_ERROR_INVALID_PARAMETER;
+    }
+
+    dev->clock = hz;
+    return MRAA_SUCCESS;
+}
+
+int
+mraa_mock_spi_write_replace(mraa_spi_context dev, uint8_t data)
+{
+    return (int) (data ^ MOCK_SPI_REPLY_DATA_MODIFIER_BYTE);
+}
+
+int
+mraa_mock_spi_write_word_replace(mraa_spi_context dev, uint16_t data)
+{
+    return (int) (data ^ MOCK_SPI_REPLY_DATA_MODIFIER_WORD);
+}
+
+mraa_result_t
+mraa_mock_spi_transfer_buf_replace(mraa_spi_context dev, uint8_t* data, uint8_t* rxbuf, int length)
+{
+    if (data == NULL) {
+        syslog(LOG_ERR, "spi: transfer_buf: Incoming data is null, cannot proceed");
+        return MRAA_ERROR_INVALID_PARAMETER;
+    }
+
+    if (length <= 0) {
+        syslog(LOG_ERR, "spi: transfer_buf: Length given is equal to or less than zero, cannot proceed");
+        return MRAA_ERROR_INVALID_PARAMETER;
+    }
+
+    if (rxbuf != NULL) {
+        for (int i = 0; i < length; ++i) {
+            rxbuf[i] = data[i] ^ MOCK_SPI_REPLY_DATA_MODIFIER_BYTE;
+        }
+    }
+
+    return MRAA_SUCCESS;
+}
+
+mraa_result_t
+mraa_mock_spi_transfer_buf_word_replace(mraa_spi_context dev, uint16_t* data, uint16_t* rxbuf, int length)
+{
+    if (data == NULL) {
+        syslog(LOG_ERR, "spi: transfer_buf_word: Incoming data is null, cannot proceed");
+        return MRAA_ERROR_INVALID_PARAMETER;
+    }
+
+    if (length <= 0) {
+        syslog(LOG_ERR, "spi: transfer_buf_word: Length given is equal to or less than zero, cannot proceed");
+        return MRAA_ERROR_INVALID_PARAMETER;
+    }
+
+    if (rxbuf != NULL) {
+        // length is given in bytes, but arrays are comprised of words
+        for (int i = 0; i < (length / 2); ++i) {
+            rxbuf[i] = data[i] ^ MOCK_SPI_REPLY_DATA_MODIFIER_WORD;
+        }
+    }
+
+    return MRAA_SUCCESS;
+}