spi: completed implementation.

* Added more functions for transaction settings.

Signed-off-by: Thomas Ingleby <thomas.c.ingleby@intel.com>
Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>

api/spi.h

@@ -44,12 +44,13 @@ typedef struct _spi* maa_spi_context;
 
 /** Initialise SPI_context, uses board mapping. Sets the muxes
  *
+ * @param bus to use, as listed in platform definition. Normally 0
  * @return maa_spi_context The returned initialised SPI context
  */
-maa_spi_context maa_spi_init();
+maa_spi_context maa_spi_init(int bus);
 
 /** Set the SPI device mode. see spidev
- *
+ * 0-3.
  * @param spi the spi device context
  * @param mode the mode. See Linux spidev
  *
@@ -85,6 +86,26 @@ uint8_t maa_spi_write(maa_spi_context dev, uint8_t data);
  */
 uint8_t* maa_spi_write_buf(maa_spi_context dev, uint8_t* data, int length);
 
+/**
+ *
+ * @param dev spi context
+ * @param lsb. Use least significant bit transmission. 0 for msbi
+ *
+ * @return maa result of operation
+ */
+maa_result_t
+maa_spi_lsbmode(maa_spi_context dev, maa_boolean_t lsb)
+
+/** Set bits per mode on transaction
+ * Defaults at 8.
+ *
+ * @param dev spi context
+ * @param bits bits per word
+ *
+ * @return Result of operation
+ */
+maa_result_t
+maa_spi_bit_per_word(maa_spi_context dev, unsigned int bits)
 
 /** De-inits an maa_spi_context device
  *

src/spi/spi.c

@@ -40,6 +40,10 @@
 struct _spi {
     /*@{*/
     int devfd; /**< File descriptor to SPI Device */
+    int mode; /**< Spi mode see spidev.h */
+    int clock; /**< clock to run transactions at */
+    maa_boolean_t lsb; /**< least significant bit mode */
+    unsigned int bpw; /**< Bits per word */
     /*@}*/
 };
 
@@ -63,6 +67,10 @@ maa_spi_init(int bus)
         free(dev);
         return NULL;
     }
+    dev->bpw = 8;
+    dev->clock = 4000000;
+    dev->lsb = 0;
+    dev->mode = 0;
 
     return dev;
 }
@@ -70,13 +78,37 @@ maa_spi_init(int bus)
 maa_result_t
 maa_spi_mode(maa_spi_context dev, unsigned short mode)
 {
-    return MAA_ERROR_FEATURE_NOT_IMPLEMENTED;
+    dev->mode = mode;
+    return MAA_SUCCESS;
 }
 
 maa_result_t
 maa_spi_frequency(maa_spi_context dev, int hz)
 {
-    return MAA_ERROR_FEATURE_NOT_IMPLEMENTED;
+    dev->clock = hz;
+    return MAA_SUCCESS;
+}
+
+maa_result_t
+maa_spi_lsbmode(maa_spi_context dev, maa_boolean_t lsb)
+{
+    uint8_t lsb_mode = 0;
+    if (lsb == 1) {
+        lsb_mode = 1;
+    }
+    if (ioctl (dev->devfd, SPI_IOC_WR_LSB_FIRST, &lsb_mode) < 0) {
+        fprintf(stderr, "Failed to set bit order\n");
+        return MAA_ERROR_INVALID_RESOURCE;
+    }
+    dev->lsb = lsb;
+    return MAA_SUCCESS;
+}
+
+maa_result_t
+maa_spi_bit_per_word(maa_spi_context dev, unsigned int bits)
+{
+    dev->bpw = bits;
+    return MAA_SUCCESS;
 }
 
 uint8_t
@@ -90,8 +122,8 @@ maa_spi_write(maa_spi_context dev, uint8_t data)
     uint8_t recv = 0;
     msg.tx_buf = (unsigned long) &data;
     msg.rx_buf = (unsigned long) &recv;
-    msg.speed_hz = 100000;
+    msg.speed_hz = dev->clock;
-    msg.bits_per_word = 8;
+    msg.bits_per_word = dev->bpw;
     msg.delay_usecs = 0;
     msg.len = length;
     if (ioctl(dev->devfd, SPI_IOC_MESSAGE(1), &msg) < 0) {
@@ -111,8 +143,8 @@ maa_spi_write_buf(maa_spi_context dev, uint8_t* data, int length)
 
     msg.tx_buf = (unsigned long) data;
     msg.rx_buf = (unsigned long) recv;
-    msg.speed_hz = 100000;
+    msg.speed_hz = dev->clock;
-    msg.bits_per_word = 8;
+    msg.bits_per_word = dev->bpw;
     msg.delay_usecs = 0;
     msg.len = length;
     if (ioctl(dev->devfd, SPI_IOC_MESSAGE(1), &msg) < 0) {
@@ -125,5 +157,6 @@ maa_spi_write_buf(maa_spi_context dev, uint8_t* data, int length)
 maa_result_t
 maa_spi_stop(maa_spi_context dev)
 {
-    return MAA_ERROR_FEATURE_NOT_IMPLEMENTED;
+    close(dev->devfd);
+    return MAA_SUCCESS;
 }