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The AD5310R is a single channel DAC with 10-bit precision, which is part of the same family as AD5311R, except that it uses the spi interface instead of i2c. The device has a built-in 2.5V reference which is enabled by default. Another important difference is that the SPI write command operation is 16 bits long. The first four bits represent the command, while the remaining 12 bits are for data. In the control reg, DB9 and DB10 are used for power-down modes, while DB8 is the REF bit. In order to accommodate this change, a new regmap type was defined and checked accordingly. Because AD5310R does not have a readback register, the read_raw operation will return "Operation is not supported". Datasheet: Link: http://www.analog.com/media/en/technical-documentation/data-sheets/AD5310R_5311R.pdf Signed-off-by: Stefan Popa <stefan.popa@analog.com> Signed-off-by: Mircea Caprioru <mircea.caprioru@analog.com> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
154 lines
3.4 KiB
C
154 lines
3.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* This file is part of AD5686 DAC driver
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*
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* Copyright 2018 Analog Devices Inc.
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*/
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#ifndef __DRIVERS_IIO_DAC_AD5686_H__
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#define __DRIVERS_IIO_DAC_AD5686_H__
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#include <linux/types.h>
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#include <linux/cache.h>
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#include <linux/mutex.h>
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#include <linux/kernel.h>
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#define AD5310_CMD(x) ((x) << 12)
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#define AD5683_DATA(x) ((x) << 4)
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#define AD5686_ADDR(x) ((x) << 16)
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#define AD5686_CMD(x) ((x) << 20)
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#define AD5686_ADDR_DAC(chan) (0x1 << (chan))
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#define AD5686_ADDR_ALL_DAC 0xF
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#define AD5686_CMD_NOOP 0x0
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#define AD5686_CMD_WRITE_INPUT_N 0x1
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#define AD5686_CMD_UPDATE_DAC_N 0x2
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#define AD5686_CMD_WRITE_INPUT_N_UPDATE_N 0x3
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#define AD5686_CMD_POWERDOWN_DAC 0x4
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#define AD5686_CMD_LDAC_MASK 0x5
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#define AD5686_CMD_RESET 0x6
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#define AD5686_CMD_INTERNAL_REFER_SETUP 0x7
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#define AD5686_CMD_DAISY_CHAIN_ENABLE 0x8
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#define AD5686_CMD_READBACK_ENABLE 0x9
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#define AD5686_LDAC_PWRDN_NONE 0x0
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#define AD5686_LDAC_PWRDN_1K 0x1
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#define AD5686_LDAC_PWRDN_100K 0x2
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#define AD5686_LDAC_PWRDN_3STATE 0x3
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#define AD5686_CMD_CONTROL_REG 0x4
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#define AD5686_CMD_READBACK_ENABLE_V2 0x5
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#define AD5310_REF_BIT_MSK BIT(8)
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#define AD5683_REF_BIT_MSK BIT(12)
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#define AD5693_REF_BIT_MSK BIT(12)
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/**
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* ad5686_supported_device_ids:
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*/
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enum ad5686_supported_device_ids {
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ID_AD5310R,
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ID_AD5311R,
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ID_AD5671R,
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ID_AD5672R,
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ID_AD5675R,
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ID_AD5676,
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ID_AD5676R,
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ID_AD5681R,
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ID_AD5682R,
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ID_AD5683,
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ID_AD5683R,
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ID_AD5684,
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ID_AD5684R,
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ID_AD5685R,
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ID_AD5686,
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ID_AD5686R,
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ID_AD5691R,
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ID_AD5692R,
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ID_AD5693,
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ID_AD5693R,
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ID_AD5694,
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ID_AD5694R,
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ID_AD5695R,
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ID_AD5696,
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ID_AD5696R,
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};
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enum ad5686_regmap_type {
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AD5310_REGMAP,
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AD5683_REGMAP,
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AD5686_REGMAP,
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AD5693_REGMAP
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};
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struct ad5686_state;
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typedef int (*ad5686_write_func)(struct ad5686_state *st,
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u8 cmd, u8 addr, u16 val);
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typedef int (*ad5686_read_func)(struct ad5686_state *st, u8 addr);
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/**
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* struct ad5686_chip_info - chip specific information
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* @int_vref_mv: AD5620/40/60: the internal reference voltage
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* @num_channels: number of channels
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* @channel: channel specification
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* @regmap_type: register map layout variant
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*/
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struct ad5686_chip_info {
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u16 int_vref_mv;
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unsigned int num_channels;
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struct iio_chan_spec *channels;
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enum ad5686_regmap_type regmap_type;
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};
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/**
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* struct ad5446_state - driver instance specific data
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* @spi: spi_device
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* @chip_info: chip model specific constants, available modes etc
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* @reg: supply regulator
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* @vref_mv: actual reference voltage used
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* @pwr_down_mask: power down mask
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* @pwr_down_mode: current power down mode
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* @use_internal_vref: set to true if the internal reference voltage is used
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* @data: spi transfer buffers
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*/
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struct ad5686_state {
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struct device *dev;
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const struct ad5686_chip_info *chip_info;
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struct regulator *reg;
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unsigned short vref_mv;
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unsigned int pwr_down_mask;
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unsigned int pwr_down_mode;
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ad5686_write_func write;
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ad5686_read_func read;
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bool use_internal_vref;
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/*
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* DMA (thus cache coherency maintenance) requires the
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* transfer buffers to live in their own cache lines.
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*/
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union {
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__be32 d32;
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__be16 d16;
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u8 d8[4];
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} data[3] ____cacheline_aligned;
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};
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int ad5686_probe(struct device *dev,
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enum ad5686_supported_device_ids chip_type,
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const char *name, ad5686_write_func write,
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ad5686_read_func read);
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int ad5686_remove(struct device *dev);
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#endif /* __DRIVERS_IIO_DAC_AD5686_H__ */
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