static s32 dpot_read_i2c(struct dpot_data *dpot, u8 reg)
{
unsigned ctrl = 0;
switch (dpot->uid) {
case DPOT_UID(AD5246_ID):
case DPOT_UID(AD5247_ID):
return dpot_read_d8(dpot);
case DPOT_UID(AD5245_ID):
case DPOT_UID(AD5241_ID):
case DPOT_UID(AD5242_ID):
case DPOT_UID(AD5243_ID):
case DPOT_UID(AD5248_ID):
case DPOT_UID(AD5280_ID):
case DPOT_UID(AD5282_ID):
ctrl = ((reg & DPOT_RDAC_MASK) == DPOT_RDAC0) ?
0 : DPOT_AD5291_RDAC_AB;
return dpot_read_r8d8(dpot, ctrl);
case DPOT_UID(AD5170_ID):
case DPOT_UID(AD5171_ID):
case DPOT_UID(AD5273_ID):
return dpot_read_d8(dpot);
case DPOT_UID(AD5172_ID):
case DPOT_UID(AD5173_ID):
ctrl = ((reg & DPOT_RDAC_MASK) == DPOT_RDAC0) ?
0 : DPOT_AD5272_3_A0;
return dpot_read_r8d8(dpot, ctrl);
default:
if ((reg & DPOT_REG_TOL) || (dpot->max_pos > 256))
return dpot_read_r8d16(dpot, (reg & 0xF8) |
((reg & 0x7) << 1));
else
return dpot_read_r8d8(dpot, reg);
}
}
static s32 dpot_read_spi(struct dpot_data *dpot, u8 reg)
{
unsigned ctrl = 0;
if (!(reg & (DPOT_ADDR_EEPROM | DPOT_ADDR_CMD))) {
if (dpot->feat & F_RDACS_WONLY)
return dpot->rdac_cache[reg & DPOT_RDAC_MASK];
if (dpot->uid == DPOT_UID(AD5291_ID) ||
dpot->uid == DPOT_UID(AD5292_ID) ||
dpot->uid == DPOT_UID(AD5293_ID))
return dpot_read_r8d8(dpot,
DPOT_AD5291_READ_RDAC << 2);
ctrl = DPOT_SPI_READ_RDAC;
} else if (reg & DPOT_ADDR_EEPROM) {
ctrl = DPOT_SPI_READ_EEPROM;
}
if (dpot->feat & F_SPI_16BIT)
return dpot_read_r8d8(dpot, ctrl);
else if (dpot->feat & F_SPI_24BIT)
return dpot_read_r8d16(dpot, ctrl);
return -EFAULT;
}
static s32 dpot_read_spi(struct dpot_data *dpot, u8 reg)
{
unsigned ctrl = 0;
int value;
if (!(reg & (DPOT_ADDR_EEPROM | DPOT_ADDR_CMD))) {
if (dpot->feat & F_RDACS_WONLY)
return dpot->rdac_cache[reg & DPOT_RDAC_MASK];
if (dpot->uid == DPOT_UID(AD5291_ID) ||
dpot->uid == DPOT_UID(AD5292_ID) ||
dpot->uid == DPOT_UID(AD5293_ID)) {
value = dpot_read_r8d8(dpot,
DPOT_AD5291_READ_RDAC << 2);
if (dpot->uid == DPOT_UID(AD5291_ID))
value = value >> 2;
return value;
} else if (dpot->uid == DPOT_UID(AD5270_ID) ||
return dpot->rdac_cache[reg & DPOT_RDAC_MASK];
if (dpot->uid == DPOT_UID(AD5291_ID) ||
dpot->uid == DPOT_UID(AD5292_ID) ||
dpot->uid == DPOT_UID(AD5293_ID)) {
value = dpot_read_r8d8(dpot,
DPOT_AD5291_READ_RDAC << 2);
if (dpot->uid == DPOT_UID(AD5291_ID))
value = value >> 2;
return value;
} else if (dpot->uid == DPOT_UID(AD5270_ID) ||
dpot->uid == DPOT_UID(AD5271_ID)) {
value = dpot_read_r8d8(dpot,
DPOT_AD5270_1_2_4_READ_RDAC << 2);
if (value < 0)
return value;
if (dpot->uid == DPOT_UID(AD5271_ID))
value = value >> 2;
return value;
}
ctrl = DPOT_SPI_READ_RDAC;
} else if (reg & DPOT_ADDR_EEPROM) {
ctrl = DPOT_SPI_READ_EEPROM;
}
