| 1 | /* |
| 2 | * AD5446 SPI DAC driver |
| 3 | * |
| 4 | * Copyright 2010 Analog Devices Inc. |
| 5 | * |
| 6 | * Licensed under the GPL-2 or later. |
| 7 | */ |
| 8 | #ifndef IIO_DAC_AD5446_H_ |
| 9 | #define IIO_DAC_AD5446_H_ |
| 10 | |
| 11 | /* DAC Control Bits */ |
| 12 | |
| 13 | #define AD5446_LOAD (0x0 << 14) /* Load and update */ |
| 14 | #define AD5446_SDO_DIS (0x1 << 14) /* Disable SDO */ |
| 15 | #define AD5446_NOP (0x2 << 14) /* No operation */ |
| 16 | #define AD5446_CLK_RISING (0x3 << 14) /* Clock data on rising edge */ |
| 17 | |
| 18 | #define AD5620_LOAD (0x0 << 14) /* Load and update Norm Operation*/ |
| 19 | #define AD5620_PWRDWN_1k (0x1 << 14) /* Power-down: 1kOhm to GND */ |
| 20 | #define AD5620_PWRDWN_100k (0x2 << 14) /* Power-down: 100kOhm to GND */ |
| 21 | #define AD5620_PWRDWN_TRISTATE (0x3 << 14) /* Power-down: Three-state */ |
| 22 | |
| 23 | #define AD5660_LOAD (0x0 << 16) /* Load and update Norm Operation*/ |
| 24 | #define AD5660_PWRDWN_1k (0x1 << 16) /* Power-down: 1kOhm to GND */ |
| 25 | #define AD5660_PWRDWN_100k (0x2 << 16) /* Power-down: 100kOhm to GND */ |
| 26 | #define AD5660_PWRDWN_TRISTATE (0x3 << 16) /* Power-down: Three-state */ |
| 27 | |
| 28 | #define RES_MASK(bits) ((1 << (bits)) - 1) |
| 29 | |
| 30 | #define MODE_PWRDWN_1k 0x1 |
| 31 | #define MODE_PWRDWN_100k 0x2 |
| 32 | #define MODE_PWRDWN_TRISTATE 0x3 |
| 33 | |
| 34 | /** |
| 35 | * struct ad5446_state - driver instance specific data |
| 36 | * @spi: spi_device |
| 37 | * @chip_info: chip model specific constants, available modes etc |
| 38 | * @reg: supply regulator |
| 39 | * @poll_work: bottom half of polling interrupt handler |
| 40 | * @vref_mv: actual reference voltage used |
| 41 | * @xfer: default spi transfer |
| 42 | * @msg: default spi message |
| 43 | * @data: spi transmit buffer |
| 44 | */ |
| 45 | |
| 46 | struct ad5446_state { |
| 47 | struct spi_device *spi; |
| 48 | const struct ad5446_chip_info *chip_info; |
| 49 | struct regulator *reg; |
| 50 | struct work_struct poll_work; |
| 51 | unsigned short vref_mv; |
| 52 | unsigned cached_val; |
| 53 | unsigned pwr_down_mode; |
| 54 | unsigned pwr_down; |
| 55 | struct spi_transfer xfer; |
| 56 | struct spi_message msg; |
| 57 | union { |
| 58 | unsigned short d16; |
| 59 | unsigned char d24[3]; |
| 60 | } data; |
| 61 | }; |
| 62 | |
| 63 | /** |
| 64 | * struct ad5446_chip_info - chip specific information |
| 65 | * @bits: accuracy of the DAC in bits |
| 66 | * @storagebits: number of bits written to the DAC |
| 67 | * @left_shift: number of bits the datum must be shifted |
| 68 | * @int_vref_mv: AD5620/40/60: the internal reference voltage |
| 69 | * @store_sample: chip specific helper function to store the datum |
| 70 | * @store_sample: chip specific helper function to store the powerpown cmd |
| 71 | */ |
| 72 | |
| 73 | struct ad5446_chip_info { |
| 74 | u8 bits; |
| 75 | u8 storagebits; |
| 76 | u8 left_shift; |
| 77 | u16 int_vref_mv; |
| 78 | void (*store_sample) (struct ad5446_state *st, unsigned val); |
| 79 | void (*store_pwr_down) (struct ad5446_state *st, unsigned mode); |
| 80 | }; |
| 81 | |
| 82 | /** |
| 83 | * ad5446_supported_device_ids: |
| 84 | * The AD5620/40/60 parts are available in different fixed internal reference |
| 85 | * voltage options. The actual part numbers may look differently |
| 86 | * (and a bit cryptic), however this style is used to make clear which |
| 87 | * parts are supported here. |
| 88 | */ |
| 89 | |
| 90 | enum ad5446_supported_device_ids { |
| 91 | ID_AD5444, |
| 92 | ID_AD5446, |
| 93 | ID_AD5541A, |
| 94 | ID_AD5542A, |
| 95 | ID_AD5543, |
| 96 | ID_AD5512A, |
| 97 | ID_AD5553, |
| 98 | ID_AD5601, |
| 99 | ID_AD5611, |
| 100 | ID_AD5621, |
| 101 | ID_AD5620_2500, |
| 102 | ID_AD5620_1250, |
| 103 | ID_AD5640_2500, |
| 104 | ID_AD5640_1250, |
| 105 | ID_AD5660_2500, |
| 106 | ID_AD5660_1250, |
| 107 | }; |
| 108 | |
| 109 | #endif /* IIO_DAC_AD5446_H_ */ |