staging: comedi: gsc_hpdi: make internal functions static

This module does not export any symbols so declare all the functions as
`static` and remove the unused ones.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Reviewed-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/drivers/gsc_hpdi.c

@@ -104,35 +104,11 @@ enum hpdi_registers {
 	INTERRUPT_POLARITY_REG = 0x54,
 };
 
-int command_channel_valid(unsigned int channel)
-{
-	if (channel == 0 || channel > 6) {
-		printk(KERN_WARNING
-		       "gsc_hpdi: bug! invalid cable command channel\n");
-		return 0;
-	}
-	return 1;
-}
-
 /* bit definitions */
 
 enum firmware_revision_bits {
 	FEATURES_REG_PRESENT_BIT = 0x8000,
 };
-int firmware_revision(uint32_t fwr_bits)
-{
-	return fwr_bits & 0xff;
-}
-
-int pcb_revision(uint32_t fwr_bits)
-{
-	return (fwr_bits >> 8) & 0xff;
-}
-
-int hpdi_subid(uint32_t fwr_bits)
-{
-	return (fwr_bits >> 16) & 0xff;
-}
 
 enum board_control_bits {
 	BOARD_RESET_BIT = 0x1,	/* wait 10usec before accessing fifos */
@@ -147,22 +123,6 @@ enum board_control_bits {
 	CABLE_THROTTLE_ENABLE_BIT = 0x20,
 	TEST_MODE_ENABLE_BIT = 0x80000000,
 };
-uint32_t command_discrete_output_bits(unsigned int channel, int output,
-				      int output_value)
-{
-	uint32_t bits = 0;
-
-	if (command_channel_valid(channel) == 0)
-		return 0;
-	if (output) {
-		bits |= 0x1 << (16 + channel);
-		if (output_value)
-			bits |= 0x1 << (24 + channel);
-	} else
-		bits |= 0x1 << (24 + channel);
-
-	return bits;
-}
 
 enum board_status_bits {
 	COMMAND_LINE_STATUS_MASK = 0x7f,
@@ -182,28 +142,17 @@ enum board_status_bits {
 	RX_OVERRUN_BIT = 0x800000,
 };
 
-uint32_t almost_full_bits(unsigned int num_words)
+static uint32_t almost_full_bits(unsigned int num_words)
 {
-/* XXX need to add or subtract one? */
+	/* XXX need to add or subtract one? */
 	return (num_words << 16) & 0xff0000;
 }
 
-uint32_t almost_empty_bits(unsigned int num_words)
+static uint32_t almost_empty_bits(unsigned int num_words)
 {
 	return num_words & 0xffff;
 }
 
-unsigned int almost_full_num_words(uint32_t bits)
-{
-/* XXX need to add or subtract one? */
-	return (bits >> 16) & 0xffff;
-}
-
-unsigned int almost_empty_num_words(uint32_t bits)
-{
-	return bits & 0xffff;
-}
-
 enum features_bits {
 	FIFO_SIZE_PRESENT_BIT = 0x1,
 	FIFO_WORDS_PRESENT_BIT = 0x2,
@@ -225,43 +174,17 @@ enum interrupt_sources {
 	RX_ALMOST_FULL_INTR = 14,
 	RX_FULL_INTR = 15,
 };
-int command_intr_source(unsigned int channel)
-{
-	if (command_channel_valid(channel) == 0)
-		channel = 1;
-	return channel + 1;
-}
 
-uint32_t intr_bit(int interrupt_source)
+static uint32_t intr_bit(int interrupt_source)
 {
 	return 0x1 << interrupt_source;
 }
 
-uint32_t tx_clock_divisor_bits(unsigned int divisor)
-{
-	return divisor & 0xff;
-}
-
-unsigned int fifo_size(uint32_t fifo_size_bits)
+static unsigned int fifo_size(uint32_t fifo_size_bits)
 {
 	return fifo_size_bits & 0xfffff;
 }
 
-unsigned int fifo_words(uint32_t fifo_words_bits)
-{
-	return fifo_words_bits & 0xfffff;
-}
-
-uint32_t intr_edge_bit(int interrupt_source)
-{
-	return 0x1 << interrupt_source;
-}
-
-uint32_t intr_active_high_bit(int interrupt_source)
-{
-	return 0x1 << interrupt_source;
-}
-
 struct hpdi_board {
 
 	char *name;