[PATCH] staging: comedi: gsc_hpdi: make internal functions static

[Ian Abbott]

This module does not export any symbols so declare all the functions as
`static`.  Some of them are currently unused but might get used in the
future, so tag them as `__maybe_unused` for now to get rid of compiler
warnings.

Signed-off-by: Ian Abbott <abbotti at mev.co.uk>
---
 drivers/staging/comedi/drivers/gsc_hpdi.c | 41 +++++++++++++++++--------------
 1 file changed, 22 insertions(+), 19 deletions(-)

diff --git a/drivers/staging/comedi/drivers/gsc_hpdi.c b/drivers/staging/comedi/drivers/gsc_hpdi.c
index 5d3fa71..5fbd827 100644
--- a/drivers/staging/comedi/drivers/gsc_hpdi.c
+++ b/drivers/staging/comedi/drivers/gsc_hpdi.c
@@ -104,7 +104,7 @@ enum hpdi_registers {
 	INTERRUPT_POLARITY_REG = 0x54,
 };
 
-int command_channel_valid(unsigned int channel)
+static int command_channel_valid(unsigned int channel)
 {
 	if (channel == 0 || channel > 6) {
 		printk(KERN_WARNING
@@ -119,17 +119,18 @@ int command_channel_valid(unsigned int channel)
 enum firmware_revision_bits {
 	FEATURES_REG_PRESENT_BIT = 0x8000,
 };
-int firmware_revision(uint32_t fwr_bits)
+
+static int __maybe_unused firmware_revision(uint32_t fwr_bits)
 {
 	return fwr_bits & 0xff;
 }
 
-int pcb_revision(uint32_t fwr_bits)
+static int __maybe_unused pcb_revision(uint32_t fwr_bits)
 {
 	return (fwr_bits >> 8) & 0xff;
 }
 
-int hpdi_subid(uint32_t fwr_bits)
+static int __maybe_unused hpdi_subid(uint32_t fwr_bits)
 {
 	return (fwr_bits >> 16) & 0xff;
 }
@@ -147,8 +148,9 @@ 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)
+
+static uint32_t __maybe_unused
+command_discrete_output_bits(unsigned int channel, int output, int output_value)
 {
 	uint32_t bits = 0;
 
@@ -182,24 +184,24 @@ 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)
+static unsigned int __maybe_unused almost_full_num_words(uint32_t bits)
 {
-/* XXX need to add or subtract one? */
+	/* XXX need to add or subtract one? */
 	return (bits >> 16) & 0xffff;
 }
 
-unsigned int almost_empty_num_words(uint32_t bits)
+static unsigned int __maybe_unused almost_empty_num_words(uint32_t bits)
 {
 	return bits & 0xffff;
 }
@@ -225,39 +227,40 @@ enum interrupt_sources {
 	RX_ALMOST_FULL_INTR = 14,
 	RX_FULL_INTR = 15,
 };
-int command_intr_source(unsigned int channel)
+
+static int __maybe_unused 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)
+static uint32_t __maybe_unused 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)
+static unsigned int __maybe_unused fifo_words(uint32_t fifo_words_bits)
 {
 	return fifo_words_bits & 0xfffff;
 }
 
-uint32_t intr_edge_bit(int interrupt_source)
+static uint32_t __maybe_unused intr_edge_bit(int interrupt_source)
 {
 	return 0x1 << interrupt_source;
 }
 
-uint32_t intr_active_high_bit(int interrupt_source)
+static uint32_t __maybe_unused intr_active_high_bit(int interrupt_source)
 {
 	return 0x1 << interrupt_source;
 }
-- 
1.7.12