diff options
Diffstat (limited to 'drivers/spi/spi-bitbang.c')
| -rw-r--r-- | drivers/spi/spi-bitbang.c | 50 |
1 files changed, 37 insertions, 13 deletions
diff --git a/drivers/spi/spi-bitbang.c b/drivers/spi/spi-bitbang.c index 3aa9e6e3dac8..f29176000b8d 100644 --- a/drivers/spi/spi-bitbang.c +++ b/drivers/spi/spi-bitbang.c @@ -49,22 +49,26 @@ struct spi_bitbang_cs { unsigned nsecs; /* (clock cycle time)/2 */ u32 (*txrx_word)(struct spi_device *spi, unsigned nsecs, - u32 word, u8 bits); + u32 word, u8 bits, unsigned flags); unsigned (*txrx_bufs)(struct spi_device *, u32 (*txrx_word)( struct spi_device *spi, unsigned nsecs, - u32 word, u8 bits), - unsigned, struct spi_transfer *); + u32 word, u8 bits, + unsigned flags), + unsigned, struct spi_transfer *, + unsigned); }; static unsigned bitbang_txrx_8( struct spi_device *spi, u32 (*txrx_word)(struct spi_device *spi, unsigned nsecs, - u32 word, u8 bits), + u32 word, u8 bits, + unsigned flags), unsigned ns, - struct spi_transfer *t + struct spi_transfer *t, + unsigned flags ) { unsigned bits = t->bits_per_word; unsigned count = t->len; @@ -76,7 +80,7 @@ static unsigned bitbang_txrx_8( if (tx) word = *tx++; - word = txrx_word(spi, ns, word, bits); + word = txrx_word(spi, ns, word, bits, flags); if (rx) *rx++ = word; count -= 1; @@ -88,9 +92,11 @@ static unsigned bitbang_txrx_16( struct spi_device *spi, u32 (*txrx_word)(struct spi_device *spi, unsigned nsecs, - u32 word, u8 bits), + u32 word, u8 bits, + unsigned flags), unsigned ns, - struct spi_transfer *t + struct spi_transfer *t, + unsigned flags ) { unsigned bits = t->bits_per_word; unsigned count = t->len; @@ -102,7 +108,7 @@ static unsigned bitbang_txrx_16( if (tx) word = *tx++; - word = txrx_word(spi, ns, word, bits); + word = txrx_word(spi, ns, word, bits, flags); if (rx) *rx++ = word; count -= 2; @@ -114,9 +120,11 @@ static unsigned bitbang_txrx_32( struct spi_device *spi, u32 (*txrx_word)(struct spi_device *spi, unsigned nsecs, - u32 word, u8 bits), + u32 word, u8 bits, + unsigned flags), unsigned ns, - struct spi_transfer *t + struct spi_transfer *t, + unsigned flags ) { unsigned bits = t->bits_per_word; unsigned count = t->len; @@ -128,7 +136,7 @@ static unsigned bitbang_txrx_32( if (tx) word = *tx++; - word = txrx_word(spi, ns, word, bits); + word = txrx_word(spi, ns, word, bits, flags); if (rx) *rx++ = word; count -= 4; @@ -235,8 +243,24 @@ static int spi_bitbang_bufs(struct spi_device *spi, struct spi_transfer *t) { struct spi_bitbang_cs *cs = spi->controller_state; unsigned nsecs = cs->nsecs; + struct spi_bitbang *bitbang; + + bitbang = spi_master_get_devdata(spi->master); + if (bitbang->set_line_direction) { + int err; - return cs->txrx_bufs(spi, cs->txrx_word, nsecs, t); + err = bitbang->set_line_direction(spi, !!(t->tx_buf)); + if (err < 0) + return err; + } + + if (spi->mode & SPI_3WIRE) { + unsigned flags; + + flags = t->tx_buf ? SPI_MASTER_NO_RX : SPI_MASTER_NO_TX; + return cs->txrx_bufs(spi, cs->txrx_word, nsecs, t, flags); + } + return cs->txrx_bufs(spi, cs->txrx_word, nsecs, t, 0); } /*----------------------------------------------------------------------*/ |