From 982e3d11ed2b7a96ee93ef62ab37826da1e75a32 Mon Sep 17 00:00:00 2001 From: H Hartley Sweeten Date: Wed, 20 Jun 2012 19:25:32 -0700 Subject: [PATCH] staging: comedi: s626: remove forward declarations 3 Move the I2C functions up to remove the need for the forward declarations. Signed-off-by: H Hartley Sweeten Cc: Ian Abbott Cc: Frank Mori Hess Signed-off-by: Greg Kroah-Hartman --- drivers/staging/comedi/drivers/s626.c | 124 +++++++++++++------------- 1 file changed, 61 insertions(+), 63 deletions(-) diff --git a/drivers/staging/comedi/drivers/s626.c b/drivers/staging/comedi/drivers/s626.c index 1efa2f021647..5fcb43ae5471 100644 --- a/drivers/staging/comedi/drivers/s626.c +++ b/drivers/staging/comedi/drivers/s626.c @@ -216,8 +216,6 @@ static int s626_ns_to_timer(int *nanosec, int round_mode); /* internal routines */ static void WriteTrimDAC(struct comedi_device *dev, uint8_t LogicalChan, uint8_t DacData); -static uint8_t I2Cread(struct comedi_device *dev, uint8_t addr); -static uint32_t I2Chandshake(struct comedi_device *dev, uint32_t val); static void SetDAC(struct comedi_device *dev, uint16_t chan, short dacdata); static void SendDAC(struct comedi_device *dev, uint32_t val); @@ -493,6 +491,67 @@ static void DEBIreplace(struct comedi_device *dev, uint16_t addr, uint16_t mask, DEBItransfer(dev); /* Execute the DEBI Write transfer. */ } +/* ************** EEPROM ACCESS FUNCTIONS ************** */ + +static uint32_t I2Chandshake(struct comedi_device *dev, uint32_t val) +{ + /* Write I2C command to I2C Transfer Control shadow register. */ + WR7146(P_I2CCTRL, val); + + /* Upload I2C shadow registers into working registers and wait for */ + /* upload confirmation. */ + + MC_ENABLE(P_MC2, MC2_UPLD_IIC); + while (!MC_TEST(P_MC2, MC2_UPLD_IIC)) + ; + + /* Wait until I2C bus transfer is finished or an error occurs. */ + while ((RR7146(P_I2CCTRL) & (I2C_BUSY | I2C_ERR)) == I2C_BUSY) + ; + + /* Return non-zero if I2C error occurred. */ + return RR7146(P_I2CCTRL) & I2C_ERR; + +} + +/* Read uint8_t from EEPROM. */ +static uint8_t I2Cread(struct comedi_device *dev, uint8_t addr) +{ + uint8_t rtnval; + + /* Send EEPROM target address. */ + if (I2Chandshake(dev, I2C_B2(I2C_ATTRSTART, I2CW) + /* Byte2 = I2C command: write to I2C EEPROM device. */ + | I2C_B1(I2C_ATTRSTOP, addr) + /* Byte1 = EEPROM internal target address. */ + | I2C_B0(I2C_ATTRNOP, 0))) { /* Byte0 = Not sent. */ + /* Abort function and declare error if handshake failed. */ + DEBUG("I2Cread: error handshake I2Cread a\n"); + return 0; + } + /* Execute EEPROM read. */ + if (I2Chandshake(dev, I2C_B2(I2C_ATTRSTART, I2CR) + + /* Byte2 = I2C */ + /* command: read */ + /* from I2C EEPROM */ + /* device. */ + |I2C_B1(I2C_ATTRSTOP, 0) + + /* Byte1 receives */ + /* uint8_t from */ + /* EEPROM. */ + |I2C_B0(I2C_ATTRNOP, 0))) { /* Byte0 = Not sent. */ + + /* Abort function and declare error if handshake failed. */ + DEBUG("I2Cread: error handshake I2Cread b\n"); + return 0; + } + /* Return copy of EEPROM value. */ + rtnval = (uint8_t) (RR7146(P_I2CCTRL) >> 16); + return rtnval; +} + static unsigned int s626_ai_reg_to_uint(int data) { unsigned int tempdata; @@ -1938,67 +1997,6 @@ static void WriteTrimDAC(struct comedi_device *dev, uint8_t LogicalChan, | (uint32_t) DacData); /* Include DAC setpoint data. */ } -/* ************** EEPROM ACCESS FUNCTIONS ************** */ -/* Read uint8_t from EEPROM. */ - -static uint8_t I2Cread(struct comedi_device *dev, uint8_t addr) -{ - uint8_t rtnval; - - /* Send EEPROM target address. */ - if (I2Chandshake(dev, I2C_B2(I2C_ATTRSTART, I2CW) - /* Byte2 = I2C command: write to I2C EEPROM device. */ - | I2C_B1(I2C_ATTRSTOP, addr) - /* Byte1 = EEPROM internal target address. */ - | I2C_B0(I2C_ATTRNOP, 0))) { /* Byte0 = Not sent. */ - /* Abort function and declare error if handshake failed. */ - DEBUG("I2Cread: error handshake I2Cread a\n"); - return 0; - } - /* Execute EEPROM read. */ - if (I2Chandshake(dev, I2C_B2(I2C_ATTRSTART, I2CR) - - /* Byte2 = I2C */ - /* command: read */ - /* from I2C EEPROM */ - /* device. */ - |I2C_B1(I2C_ATTRSTOP, 0) - - /* Byte1 receives */ - /* uint8_t from */ - /* EEPROM. */ - |I2C_B0(I2C_ATTRNOP, 0))) { /* Byte0 = Not sent. */ - - /* Abort function and declare error if handshake failed. */ - DEBUG("I2Cread: error handshake I2Cread b\n"); - return 0; - } - /* Return copy of EEPROM value. */ - rtnval = (uint8_t) (RR7146(P_I2CCTRL) >> 16); - return rtnval; -} - -static uint32_t I2Chandshake(struct comedi_device *dev, uint32_t val) -{ - /* Write I2C command to I2C Transfer Control shadow register. */ - WR7146(P_I2CCTRL, val); - - /* Upload I2C shadow registers into working registers and wait for */ - /* upload confirmation. */ - - MC_ENABLE(P_MC2, MC2_UPLD_IIC); - while (!MC_TEST(P_MC2, MC2_UPLD_IIC)) - ; - - /* Wait until I2C bus transfer is finished or an error occurs. */ - while ((RR7146(P_I2CCTRL) & (I2C_BUSY | I2C_ERR)) == I2C_BUSY) - ; - - /* Return non-zero if I2C error occurred. */ - return RR7146(P_I2CCTRL) & I2C_ERR; - -} - /* Private helper function: Write setpoint to an application DAC channel. */ static void SetDAC(struct comedi_device *dev, uint16_t chan, short dacdata) -- 2.20.1