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path: root/drivers/spi/spi-gpio.c
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Diffstat (limited to 'drivers/spi/spi-gpio.c')
-rw-r--r--drivers/spi/spi-gpio.c17
1 files changed, 16 insertions, 1 deletions
diff --git a/drivers/spi/spi-gpio.c b/drivers/spi/spi-gpio.c
index be68298cbd9c..0626e6e3ea0c 100644
--- a/drivers/spi/spi-gpio.c
+++ b/drivers/spi/spi-gpio.c
@@ -121,7 +121,10 @@ static inline int getmiso(const struct spi_device *spi)
{
struct spi_gpio *spi_gpio = spi_to_spi_gpio(spi);
- return !!gpiod_get_value_cansleep(spi_gpio->miso);
+ if (spi->mode & SPI_3WIRE)
+ return !!gpiod_get_value_cansleep(spi_gpio->mosi);
+ else
+ return !!gpiod_get_value_cansleep(spi_gpio->miso);
}
/*
@@ -250,6 +253,16 @@ static int spi_gpio_setup(struct spi_device *spi)
return status;
}
+static int spi_gpio_set_direction(struct spi_device *spi, bool output)
+{
+ struct spi_gpio *spi_gpio = spi_to_spi_gpio(spi);
+
+ if (output)
+ return gpiod_direction_output(spi_gpio->mosi, 1);
+ else
+ return gpiod_direction_input(spi_gpio->mosi);
+}
+
static void spi_gpio_cleanup(struct spi_device *spi)
{
spi_bitbang_cleanup(spi);
@@ -395,6 +408,7 @@ static int spi_gpio_probe(struct platform_device *pdev)
return status;
master->bits_per_word_mask = SPI_BPW_RANGE_MASK(1, 32);
+ master->mode_bits = SPI_3WIRE | SPI_CPHA | SPI_CPOL;
master->flags = master_flags;
master->bus_num = pdev->id;
/* The master needs to think there is a chipselect even if not connected */
@@ -407,6 +421,7 @@ static int spi_gpio_probe(struct platform_device *pdev)
spi_gpio->bitbang.master = master;
spi_gpio->bitbang.chipselect = spi_gpio_chipselect;
+ spi_gpio->bitbang.set_line_direction = spi_gpio_set_direction;
if ((master_flags & (SPI_MASTER_NO_TX | SPI_MASTER_NO_RX)) == 0) {
spi_gpio->bitbang.txrx_word[SPI_MODE_0] = spi_gpio_txrx_word_mode0;