spi: spidev: Add support for Dual/Quad SPI Transfers

Add support for Dual/Quad SPI Transfers to the spidev API.
As this uses SPI mode bits that don't fit in a single byte, two new
ioctls (SPI_IOC_RD_MODE32 and SPI_IOC_WR_MODE32) are introduced.

Signed-off-by: Geert Uytterhoeven <geert+renesas@linux-m68k.org>
Signed-off-by: Mark Brown <broonie@linaro.org>

1 files changed, 15 insertions, 4 deletions

diff --git a/drivers/spi/spidev.c b/drivers/spi/spidev.c
index 2abc0f5a82be..e3bc23bb5883 100644
--- a/drivers/spi/spidev.c
+++ b/drivers/spi/spidev.c
@@ -73,7 +73,8 @@ static DECLARE_BITMAP(minors, N_SPI_MINORS);
  */
 #define SPI_MODE_MASK           (SPI_CPHA | SPI_CPOL | SPI_CS_HIGH \
                                 | SPI_LSB_FIRST | SPI_3WIRE | SPI_LOOP \
-                                | SPI_NO_CS | SPI_READY)
+                                | SPI_NO_CS | SPI_READY | SPI_TX_DUAL \
+                                | SPI_TX_QUAD | SPI_RX_DUAL | SPI_RX_QUAD)
 
 struct spidev_data {
         dev_t                   devt;
@@ -265,6 +266,8 @@ static int spidev_message(struct spidev_data *spidev,
                 buf += k_tmp->len;
 
                 k_tmp->cs_change = !!u_tmp->cs_change;
+                k_tmp->tx_nbits = u_tmp->tx_nbits;
+                k_tmp->rx_nbits = u_tmp->rx_nbits;
                 k_tmp->bits_per_word = u_tmp->bits_per_word;
                 k_tmp->delay_usecs = u_tmp->delay_usecs;
                 k_tmp->speed_hz = u_tmp->speed_hz;
@@ -359,6 +362,10 @@ spidev_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
                 retval = __put_user(spi->mode & SPI_MODE_MASK,
                                         (__u8 __user *)arg);
                 break;
+        case SPI_IOC_RD_MODE32:
+                retval = __put_user(spi->mode & SPI_MODE_MASK,
+                                        (__u32 __user *)arg);
+                break;
         case SPI_IOC_RD_LSB_FIRST:
                 retval = __put_user((spi->mode & SPI_LSB_FIRST) ?  1 : 0,
                                         (__u8 __user *)arg);
@@ -372,7 +379,11 @@ spidev_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 
         /* write requests */
         case SPI_IOC_WR_MODE:
-                retval = __get_user(tmp, (u8 __user *)arg);
+        case SPI_IOC_WR_MODE32:
+                if (cmd == SPI_IOC_WR_MODE)
+                        retval = __get_user(tmp, (u8 __user *)arg);
+                else
+                        retval = __get_user(tmp, (u32 __user *)arg);
                 if (retval == 0) {
                         u32     save = spi->mode;
 
@@ -382,12 +393,12 @@ spidev_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
                         }
 
                         tmp |= spi->mode & ~SPI_MODE_MASK;
-                        spi->mode = (u8)tmp;
+                        spi->mode = (u16)tmp;
                         retval = spi_setup(spi);
                         if (retval < 0)
                                 spi->mode = save;
                         else
-                                dev_dbg(&spi->dev, "spi mode %02x\n", tmp);
+                                dev_dbg(&spi->dev, "spi mode %x\n", tmp);
                 }
                 break;
         case SPI_IOC_WR_LSB_FIRST: