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staging: comedi: addi_eeprom: add defines for the 93c76 eeprom bits

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Define the magic values used for the clock, chip-select, data out,
and data in signals to the 93c76 eeprom.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
H Hartley Sweeten
2012-10-29 17:04:48 -07:00
committed by Greg Kroah-Hartman
parent 6baf51033c
commit d615de2554
1 changed files with 14 additions and 17 deletions
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31
drivers/staging/comedi/drivers/addi-data/addi_eeprom.c
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@@ -48,6 +48,11 @@ You should also find the complete GPL in the COPYING file accompanying this sour
#define NVCMD_BEGIN_READ (0x7 << 5) /* nvRam begin read command */
#define NVCMD_LOAD_LOW (0x4 << 5) /* nvRam load low command */
#define NVCMD_LOAD_HIGH (0x5 << 5) /* nvRam load high command */
#define EE93C76_CLK_BIT (1 << 0)
#define EE93C76_CS_BIT (1 << 1)
#define EE93C76_DOUT_BIT (1 << 2)
#define EE93C76_DIN_BIT (1 << 3)
#define EE76_CMD_LEN 13 /* bits in instructions */
#define EE_READ 0x0180 /* 01 1000 0000 read instruction */
@@ -110,12 +115,10 @@ struct str_AnalogInputHeader {
static void v_EepromClock76(unsigned long iobase,
unsigned int dw_RegisterValue)
{
/* Set EEPROM clock Low */
outl(dw_RegisterValue & 0x6, iobase);
outl(dw_RegisterValue & ~EE93C76_CLK_BIT, iobase);
udelay(100);
/* Set EEPROM clock High */
outl(dw_RegisterValue | 0x1, iobase);
outl(dw_RegisterValue | EE93C76_CLK_BIT, iobase);
udelay(100);
}
@@ -123,11 +126,8 @@ static void v_EepromSendCommand76(unsigned long iobase,
unsigned int dw_EepromCommand,
unsigned char b_DataLengthInBits)
{
unsigned int dw_RegisterValue = EE93C76_CS_BIT;
char c_BitPos = 0;
unsigned int dw_RegisterValue = 0;
/* Enable EEPROM Chip Select */
dw_RegisterValue = 0x2;
/* Toggle EEPROM's Chip select to get it out of Shift Register Mode */
outl(dw_RegisterValue, iobase);
@@ -135,13 +135,10 @@ static void v_EepromSendCommand76(unsigned long iobase,
/* Send EEPROM command - one bit at a time */
for (c_BitPos = (b_DataLengthInBits - 1); c_BitPos >= 0; c_BitPos--) {
if (dw_EepromCommand & (1 << c_BitPos)) {
/* Write 1 */
dw_RegisterValue = dw_RegisterValue | 0x4;
} else {
/* Write 0 */
dw_RegisterValue = dw_RegisterValue & 0x3;
}
if (dw_EepromCommand & (1 << c_BitPos))
dw_RegisterValue = dw_RegisterValue | EE93C76_DOUT_BIT;
else
dw_RegisterValue = dw_RegisterValue & ~EE93C76_DOUT_BIT;
/* Write the command */
outl(dw_RegisterValue, iobase);
@@ -165,7 +162,7 @@ static void v_EepromCs76Read(unsigned long iobase,
EE76_CMD_LEN);
/* Get the last register value */
dw_RegisterValue = (((w_offset / 2) & 0x1) << 2) | 0x2;
dw_RegisterValue = (((w_offset / 2) & 0x1) << 2) | EE93C76_CS_BIT;
/* Set the 16-bit value of 0 */
*pw_Value = 0;
@@ -180,7 +177,7 @@ static void v_EepromCs76Read(unsigned long iobase,
udelay(100);
/* Get bit value and shift into result */
if (dw_RegisterValueRead & 0x8) {
if (dw_RegisterValueRead & EE93C76_DIN_BIT) {
/* Read 1 */
*pw_Value = (*pw_Value << 1) | 0x1;
} else {