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path: root/drivers/spi/spi-bitbang.c
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Diffstat (limited to 'drivers/spi/spi-bitbang.c')
-rw-r--r--drivers/spi/spi-bitbang.c66
1 files changed, 39 insertions, 27 deletions
diff --git a/drivers/spi/spi-bitbang.c b/drivers/spi/spi-bitbang.c
index dd9a8c54a693..4243e53f9f7b 100644
--- a/drivers/spi/spi-bitbang.c
+++ b/drivers/spi/spi-bitbang.c
@@ -335,6 +335,42 @@ static void spi_bitbang_set_cs(struct spi_device *spi, bool enable)
/*----------------------------------------------------------------------*/
+int spi_bitbang_init(struct spi_bitbang *bitbang)
+{
+ struct spi_master *master = bitbang->master;
+
+ if (!master || !bitbang->chipselect)
+ return -EINVAL;
+
+ mutex_init(&bitbang->lock);
+
+ if (!master->mode_bits)
+ master->mode_bits = SPI_CPOL | SPI_CPHA | bitbang->flags;
+
+ if (master->transfer || master->transfer_one_message)
+ return -EINVAL;
+
+ master->prepare_transfer_hardware = spi_bitbang_prepare_hardware;
+ master->unprepare_transfer_hardware = spi_bitbang_unprepare_hardware;
+ master->transfer_one = spi_bitbang_transfer_one;
+ master->set_cs = spi_bitbang_set_cs;
+
+ if (!bitbang->txrx_bufs) {
+ bitbang->use_dma = 0;
+ bitbang->txrx_bufs = spi_bitbang_bufs;
+ if (!master->setup) {
+ if (!bitbang->setup_transfer)
+ bitbang->setup_transfer =
+ spi_bitbang_setup_transfer;
+ master->setup = spi_bitbang_setup;
+ master->cleanup = spi_bitbang_cleanup;
+ }
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(spi_bitbang_init);
+
/**
* spi_bitbang_start - start up a polled/bitbanging SPI master driver
* @bitbang: driver handle
@@ -368,33 +404,9 @@ int spi_bitbang_start(struct spi_bitbang *bitbang)
struct spi_master *master = bitbang->master;
int ret;
- if (!master || !bitbang->chipselect)
- return -EINVAL;
-
- mutex_init(&bitbang->lock);
-
- if (!master->mode_bits)
- master->mode_bits = SPI_CPOL | SPI_CPHA | bitbang->flags;
-
- if (master->transfer || master->transfer_one_message)
- return -EINVAL;
-
- master->prepare_transfer_hardware = spi_bitbang_prepare_hardware;
- master->unprepare_transfer_hardware = spi_bitbang_unprepare_hardware;
- master->transfer_one = spi_bitbang_transfer_one;
- master->set_cs = spi_bitbang_set_cs;
-
- if (!bitbang->txrx_bufs) {
- bitbang->use_dma = 0;
- bitbang->txrx_bufs = spi_bitbang_bufs;
- if (!master->setup) {
- if (!bitbang->setup_transfer)
- bitbang->setup_transfer =
- spi_bitbang_setup_transfer;
- master->setup = spi_bitbang_setup;
- master->cleanup = spi_bitbang_cleanup;
- }
- }
+ ret = spi_bitbang_init(bitbang);
+ if (ret)
+ return ret;
/* driver may get busy before register() returns, especially
* if someone registered boardinfo for devices