[bitbash] Add optional open() and close() methods for bit-bashing interfaces

Signed-off-by: Michael Brown <mcb30@ipxe.org>

2 files changed, 16 insertions, 1 deletions

diff --git a/src/drivers/bitbash/i2c_bit.c b/src/drivers/bitbash/i2c_bit.c
index a72d1459..decc8d80 100644
--- a/src/drivers/bitbash/i2c_bit.c
+++ b/src/drivers/bitbash/i2c_bit.c
@@ -239,6 +239,7 @@ static int i2c_reset ( struct bit_basher *basher ) {
 	 * pull SDA low while SCL is high (which creates a start
 	 * condition).
 	 */
+	open_bit ( basher );
 	setscl ( basher, 0 );
 	setsda ( basher, 1 );
 	for ( i = 0 ; i < I2C_RESET_MAX_CYCLES ; i++ ) {
@@ -251,6 +252,7 @@ static int i2c_reset ( struct bit_basher *basher ) {
 			i2c_stop ( basher );
 			DBGC ( basher, "I2CBIT %p reset after %d attempts\n",
 			       basher, ( i + 1 ) );
+			close_bit ( basher );
 			return 0;
 		}
 		setscl ( basher, 0 );
@@ -258,6 +260,7 @@ static int i2c_reset ( struct bit_basher *basher ) {
 
 	DBGC ( basher, "I2CBIT %p could not reset after %d attempts\n",
 	       basher, i );
+	close_bit ( basher );
 	return -ETIMEDOUT;
 }
 
@@ -285,6 +288,8 @@ static int i2c_bit_read ( struct i2c_interface *i2c,
 	DBGC ( basher, "I2CBIT %p reading from device %x: ",
 	       basher, i2cdev->dev_addr );
 
+	open_bit ( basher );
+
 	for ( ; ; data++, offset++ ) {
 
 		/* Select device for writing */
@@ -312,6 +317,7 @@ static int i2c_bit_read ( struct i2c_interface *i2c,
 	
 	DBGC ( basher, "%s\n", ( rc ? "failed" : "" ) );
 	i2c_stop ( basher );
+	close_bit ( basher );
 	return rc;
 }
 
@@ -339,6 +345,8 @@ static int i2c_bit_write ( struct i2c_interface *i2c,
 	DBGC ( basher, "I2CBIT %p writing to device %x: ",
 	       basher, i2cdev->dev_addr );
 
+	open_bit ( basher );
+
 	for ( ; ; data++, offset++ ) {
 
 		/* Select device for writing */
@@ -359,9 +367,10 @@ static int i2c_bit_write ( struct i2c_interface *i2c,
 		if ( ( rc = i2c_send_byte ( basher, *data ) ) != 0 )
 			break;
 	}
-	
+
 	DBGC ( basher, "%s\n", ( rc ? "failed" : "" ) );
 	i2c_stop ( basher );
+	close_bit ( basher );
 	return rc;
 }
 
diff --git a/src/drivers/bitbash/spi_bit.c b/src/drivers/bitbash/spi_bit.c
index 4a9af0a3..1b39d72f 100644
--- a/src/drivers/bitbash/spi_bit.c
+++ b/src/drivers/bitbash/spi_bit.c
@@ -163,6 +163,9 @@ static int spi_bit_rw ( struct spi_bus *bus, struct spi_device *device,
 	uint32_t tmp_address;
 	uint32_t tmp_address_detect;
 
+	/* Open bit-bashing interface */
+	open_bit ( &spibit->basher );
+
 	/* Deassert chip select to reset specified slave */
 	spi_bit_set_slave_select ( spibit, device->slave, DESELECT_SLAVE );
 
@@ -214,6 +217,9 @@ static int spi_bit_rw ( struct spi_bus *bus, struct spi_device *device,
 	/* Deassert chip select on specified slave */
 	spi_bit_set_slave_select ( spibit, device->slave, DESELECT_SLAVE );
 
+	/* Close bit-bashing interface */
+	close_bit ( &spibit->basher );
+
 	return 0;
 }