spi: move common spi_setup() functionality into core

[deliverable/linux.git] / drivers / spi / spi.c

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 8eba98c8ed1e0727bb200f58be39d3831ab30b26..0276bc37e2553d76637e0d8cadc2f10d999ce70e 100644 (file)
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -265,7 +265,7 @@ int spi_add_device(struct spi_device *spi)
         * normally rely on the device being setup.  Devices
         * using SPI_CS_HIGH can't coexist well otherwise...
         */
-       status = spi->master->setup(spi);
+       status = spi_setup(spi);
        if (status < 0) {
                dev_err(dev, "can't %s %s, status %d\n",
                                "setup", dev_name(&spi->dev), status);
@@ -583,6 +583,59 @@ EXPORT_SYMBOL_GPL(spi_busnum_to_master);
 
 /*-------------------------------------------------------------------------*/
 
+/* Core methods for SPI master protocol drivers.  Some of the
+ * other core methods are currently defined as inline functions.
+ */
+
+/**
+ * spi_setup - setup SPI mode and clock rate
+ * @spi: the device whose settings are being modified
+ * Context: can sleep, and no requests are queued to the device
+ *
+ * SPI protocol drivers may need to update the transfer mode if the
+ * device doesn't work with its default.  They may likewise need
+ * to update clock rates or word sizes from initial values.  This function
+ * changes those settings, and must be called from a context that can sleep.
+ * Except for SPI_CS_HIGH, which takes effect immediately, the changes take
+ * effect the next time the device is selected and data is transferred to
+ * or from it.  When this function returns, the spi device is deselected.
+ *
+ * Note that this call will fail if the protocol driver specifies an option
+ * that the underlying controller or its driver does not support.  For
+ * example, not all hardware supports wire transfers using nine bit words,
+ * LSB-first wire encoding, or active-high chipselects.
+ */
+int spi_setup(struct spi_device *spi)
+{
+       int             status;
+
+       if (!spi->bits_per_word)
+               spi->bits_per_word = 8;
+
+       status = spi->master->setup(spi);
+
+       dev_dbg(&spi->dev, "setup mode %d, %s%s%s%s"
+                               "%u bits/w, %u Hz max --> %d\n",
+                       (int) (spi->mode & (SPI_CPOL | SPI_CPHA)),
+                       (spi->mode & SPI_CS_HIGH) ? "cs_high, " : "",
+                       (spi->mode & SPI_LSB_FIRST) ? "lsb, " : "",
+                       (spi->mode & SPI_3WIRE) ? "3wire, " : "",
+                       (spi->mode & SPI_LOOP) ? "loopback, " : "",
+                       spi->bits_per_word, spi->max_speed_hz,
+                       status);
+
+       return status;
+}
+EXPORT_SYMBOL_GPL(spi_setup);
+
+
+/*-------------------------------------------------------------------------*/
+
+/* Utility methods for SPI master protocol drivers, layered on
+ * top of the core.  Some other utility methods are defined as
+ * inline functions.
+ */
+
 static void spi_complete(void *arg)
 {
        complete(arg);