1 /* 2 * AD7792/AD7793 SPI ADC driver 3 * 4 * Copyright 2011 Analog Devices Inc. 5 * 6 * Licensed under the GPL-2. 7 */ 8 #ifndef IIO_ADC_AD7793_H_ 9 #define IIO_ADC_AD7793_H_ 10 11 /* 12 * TODO: struct ad7793_platform_data needs to go into include/linux/iio 13 */ 14 15 /* Registers */ 16 #define AD7793_REG_COMM 0 /* Communications Register (WO, 8-bit) */ 17 #define AD7793_REG_STAT 0 /* Status Register (RO, 8-bit) */ 18 #define AD7793_REG_MODE 1 /* Mode Register (RW, 16-bit */ 19 #define AD7793_REG_CONF 2 /* Configuration Register (RW, 16-bit) */ 20 #define AD7793_REG_DATA 3 /* Data Register (RO, 16-/24-bit) */ 21 #define AD7793_REG_ID 4 /* ID Register (RO, 8-bit) */ 22 #define AD7793_REG_IO 5 /* IO Register (RO, 8-bit) */ 23 #define AD7793_REG_OFFSET 6 /* Offset Register (RW, 16-bit 24 * (AD7792)/24-bit (AD7793)) */ 25 #define AD7793_REG_FULLSALE 7 /* Full-Scale Register 26 * (RW, 16-bit (AD7792)/24-bit (AD7793)) */ 27 28 /* Communications Register Bit Designations (AD7793_REG_COMM) */ 29 #define AD7793_COMM_WEN (1 << 7) /* Write Enable */ 30 #define AD7793_COMM_WRITE (0 << 6) /* Write Operation */ 31 #define AD7793_COMM_READ (1 << 6) /* Read Operation */ 32 #define AD7793_COMM_ADDR(x) (((x) & 0x7) << 3) /* Register Address */ 33 #define AD7793_COMM_CREAD (1 << 2) /* Continuous Read of Data Register */ 34 35 /* Status Register Bit Designations (AD7793_REG_STAT) */ 36 #define AD7793_STAT_RDY (1 << 7) /* Ready */ 37 #define AD7793_STAT_ERR (1 << 6) /* Error (Overrange, Underrange) */ 38 #define AD7793_STAT_CH3 (1 << 2) /* Channel 3 */ 39 #define AD7793_STAT_CH2 (1 << 1) /* Channel 2 */ 40 #define AD7793_STAT_CH1 (1 << 0) /* Channel 1 */ 41 42 /* Mode Register Bit Designations (AD7793_REG_MODE) */ 43 #define AD7793_MODE_SEL(x) (((x) & 0x7) << 13) /* Operation Mode Select */ 44 #define AD7793_MODE_CLKSRC(x) (((x) & 0x3) << 6) /* ADC Clock Source Select */ 45 #define AD7793_MODE_RATE(x) ((x) & 0xF) /* Filter Update Rate Select */ 46 47 #define AD7793_MODE_CONT 0 /* Continuous Conversion Mode */ 48 #define AD7793_MODE_SINGLE 1 /* Single Conversion Mode */ 49 #define AD7793_MODE_IDLE 2 /* Idle Mode */ 50 #define AD7793_MODE_PWRDN 3 /* Power-Down Mode */ 51 #define AD7793_MODE_CAL_INT_ZERO 4 /* Internal Zero-Scale Calibration */ 52 #define AD7793_MODE_CAL_INT_FULL 5 /* Internal Full-Scale Calibration */ 53 #define AD7793_MODE_CAL_SYS_ZERO 6 /* System Zero-Scale Calibration */ 54 #define AD7793_MODE_CAL_SYS_FULL 7 /* System Full-Scale Calibration */ 55 56 #define AD7793_CLK_INT 0 /* Internal 64 kHz Clock not 57 * available at the CLK pin */ 58 #define AD7793_CLK_INT_CO 1 /* Internal 64 kHz Clock available 59 * at the CLK pin */ 60 #define AD7793_CLK_EXT 2 /* External 64 kHz Clock */ 61 #define AD7793_CLK_EXT_DIV2 3 /* External Clock divided by 2 */ 62 63 /* Configuration Register Bit Designations (AD7793_REG_CONF) */ 64 #define AD7793_CONF_VBIAS(x) (((x) & 0x3) << 14) /* Bias Voltage 65 * Generator Enable */ 66 #define AD7793_CONF_BO_EN (1 << 13) /* Burnout Current Enable */ 67 #define AD7793_CONF_UNIPOLAR (1 << 12) /* Unipolar/Bipolar Enable */ 68 #define AD7793_CONF_BOOST (1 << 11) /* Boost Enable */ 69 #define AD7793_CONF_GAIN(x) (((x) & 0x7) << 8) /* Gain Select */ 70 #define AD7793_CONF_REFSEL (1 << 7) /* INT/EXT Reference Select */ 71 #define AD7793_CONF_BUF (1 << 4) /* Buffered Mode Enable */ 72 #define AD7793_CONF_CHAN(x) ((x) & 0x7) /* Channel select */ 73 74 #define AD7793_CH_AIN1P_AIN1M 0 /* AIN1(+) - AIN1(-) */ 75 #define AD7793_CH_AIN2P_AIN2M 1 /* AIN2(+) - AIN2(-) */ 76 #define AD7793_CH_AIN3P_AIN3M 2 /* AIN3(+) - AIN3(-) */ 77 #define AD7793_CH_AIN1M_AIN1M 3 /* AIN1(-) - AIN1(-) */ 78 #define AD7793_CH_TEMP 6 /* Temp Sensor */ 79 #define AD7793_CH_AVDD_MONITOR 7 /* AVDD Monitor */ 80 81 /* ID Register Bit Designations (AD7793_REG_ID) */ 82 #define AD7792_ID 0xA 83 #define AD7793_ID 0xB 84 #define AD7793_ID_MASK 0xF 85 86 /* IO (Excitation Current Sources) Register Bit Designations (AD7793_REG_IO) */ 87 #define AD7793_IO_IEXC1_IOUT1_IEXC2_IOUT2 0 /* IEXC1 connect to IOUT1, 88 * IEXC2 connect to IOUT2 */ 89 #define AD7793_IO_IEXC1_IOUT2_IEXC2_IOUT1 1 /* IEXC1 connect to IOUT2, 90 * IEXC2 connect to IOUT1 */ 91 #define AD7793_IO_IEXC1_IEXC2_IOUT1 2 /* Both current sources 92 * IEXC1,2 connect to IOUT1 */ 93 #define AD7793_IO_IEXC1_IEXC2_IOUT2 3 /* Both current sources 94 * IEXC1,2 connect to IOUT2 */ 95 96 #define AD7793_IO_IXCEN_10uA (1 << 0) /* Excitation Current 10uA */ 97 #define AD7793_IO_IXCEN_210uA (2 << 0) /* Excitation Current 210uA */ 98 #define AD7793_IO_IXCEN_1mA (3 << 0) /* Excitation Current 1mA */ 99 100 struct ad7793_platform_data { 101 u16 vref_mv; 102 u16 mode; 103 u16 conf; 104 u8 io; 105 }; 106 107 #endif /* IIO_ADC_AD7793_H_ */ 108