// SPDX-License-Identifier: GPL-2.0 /* * AD7606 SPI ADC driver * * Copyright 2011 Analog Devices Inc. */ #include #include #include #include #include #include "ad7606.h" #define MAX_SPI_FREQ_HZ 23500000 /* VDRIVE above 4.75 V */ #define AD7616_CONFIGURATION_REGISTER 0x02 #define AD7616_OS_MASK GENMASK(4, 2) #define AD7616_BURST_MODE BIT(6) #define AD7616_SEQEN_MODE BIT(5) #define AD7616_RANGE_CH_A_ADDR_OFF 0x04 #define AD7616_RANGE_CH_B_ADDR_OFF 0x06 /* * Range of channels from a group are stored in 2 registers. * 0, 1, 2, 3 in a register followed by 4, 5, 6, 7 in second register. * For channels from second group(8-15) the order is the same, only with * an offset of 2 for register address. */ #define AD7616_RANGE_CH_ADDR(ch) ((ch) >> 2) /* The range of the channel is stored in 2 bits */ #define AD7616_RANGE_CH_MSK(ch) (0b11 << (((ch) & 0b11) * 2)) #define AD7616_RANGE_CH_MODE(ch, mode) ((mode) << ((((ch) & 0b11)) * 2)) #define AD7606_CONFIGURATION_REGISTER 0x02 #define AD7606_SINGLE_DOUT 0x00 /* * Range for AD7606B channels are stored in registers starting with address 0x3. * Each register stores range for 2 channels(4 bits per channel). */ #define AD7606_RANGE_CH_MSK(ch) (GENMASK(3, 0) << (4 * ((ch) & 0x1))) #define AD7606_RANGE_CH_MODE(ch, mode) \ ((GENMASK(3, 0) & mode) << (4 * ((ch) & 0x1))) #define AD7606_RANGE_CH_ADDR(ch) (0x03 + ((ch) >> 1)) #define AD7606_OS_MODE 0x08 static const struct iio_chan_spec ad7616_sw_channels[] = { IIO_CHAN_SOFT_TIMESTAMP(16), AD7616_CHANNEL(0), AD7616_CHANNEL(1), AD7616_CHANNEL(2), AD7616_CHANNEL(3), AD7616_CHANNEL(4), AD7616_CHANNEL(5), AD7616_CHANNEL(6), AD7616_CHANNEL(7), AD7616_CHANNEL(8), AD7616_CHANNEL(9), AD7616_CHANNEL(10), AD7616_CHANNEL(11), AD7616_CHANNEL(12), AD7616_CHANNEL(13), AD7616_CHANNEL(14), AD7616_CHANNEL(15), }; static const struct iio_chan_spec ad7606b_sw_channels[] = { IIO_CHAN_SOFT_TIMESTAMP(8), AD7616_CHANNEL(0), AD7616_CHANNEL(1), AD7616_CHANNEL(2), AD7616_CHANNEL(3), AD7616_CHANNEL(4), AD7616_CHANNEL(5), AD7616_CHANNEL(6), AD7616_CHANNEL(7), }; static const unsigned int ad7606B_oversampling_avail[9] = { 1, 2, 4, 8, 16, 32, 64, 128, 256 }; static u16 ad7616_spi_rd_wr_cmd(int addr, char isWriteOp) { /* * The address of register consist of one w/r bit * 6 bits of address followed by one reserved bit. */ return ((addr & 0x7F) << 1) | ((isWriteOp & 0x1) << 7); } static u16 ad7606B_spi_rd_wr_cmd(int addr, char is_write_op) { /* * The address of register consists of one bit which * specifies a read command placed in bit 6, followed by * 6 bits of address. */ return (addr & 0x3F) | (((~is_write_op) & 0x1) << 6); } static int ad7606_spi_read_block(struct device *dev, int count, void *buf) { struct spi_device *spi = to_spi_device(dev); int i, ret; unsigned short *data = buf; __be16 *bdata = buf; ret = spi_read(spi, buf, count * 2); if (ret < 0) { dev_err(&spi->dev, "SPI read error\n"); return ret; } for (i = 0; i < count; i++) data[i] = be16_to_cpu(bdata[i]); return 0; } static int ad7606_spi_reg_read(struct ad7606_state *st, unsigned int addr) { struct spi_device *spi = to_spi_device(st->dev); struct spi_transfer t[] = { { .tx_buf = &st->d16[0], .len = 2, .cs_change = 0, }, { .rx_buf = &st->d16[1], .len = 2, }, }; int ret; st->d16[0] = cpu_to_be16(st->bops->rd_wr_cmd(addr, 0) << 8); ret = spi_sync_transfer(spi, t, ARRAY_SIZE(t)); if (ret < 0) return ret; return be16_to_cpu(st->d16[1]); } static int ad7606_spi_reg_write(struct ad7606_state *st, unsigned int addr, unsigned int val) { struct spi_device *spi = to_spi_device(st->dev); st->d16[0] = cpu_to_be16((st->bops->rd_wr_cmd(addr, 1) << 8) | (val & 0x1FF)); return spi_write(spi, &st->d16[0], sizeof(st->d16[0])); } static int ad7606_spi_write_mask(struct ad7606_state *st, unsigned int addr, unsigned long mask, unsigned int val) { int readval; readval = st->bops->reg_read(st, addr); if (readval < 0) return readval; readval &= ~mask; readval |= val; return st->bops->reg_write(st, addr, readval); } static int ad7616_write_scale_sw(struct iio_dev *indio_dev, int ch, int val) { struct ad7606_state *st = iio_priv(indio_dev); unsigned int ch_addr, mode, ch_index; /* * Ad7616 has 16 channels divided in group A and group B. * The range of channels from A are stored in registers with address 4 * while channels from B are stored in register with address 6. * The last bit from channels determines if it is from group A or B * because the order of channels in iio is 0A, 0B, 1A, 1B... */ ch_index = ch >> 1; ch_addr = AD7616_RANGE_CH_ADDR(ch_index); if ((ch & 0x1) == 0) /* channel A */ ch_addr += AD7616_RANGE_CH_A_ADDR_OFF; else /* channel B */ ch_addr += AD7616_RANGE_CH_B_ADDR_OFF; /* 0b01 for 2.5v, 0b10 for 5v and 0b11 for 10v */ mode = AD7616_RANGE_CH_MODE(ch_index, ((val + 1) & 0b11)); return st->bops->write_mask(st, ch_addr, AD7616_RANGE_CH_MSK(ch_index), mode); } static int ad7616_write_os_sw(struct iio_dev *indio_dev, int val) { struct ad7606_state *st = iio_priv(indio_dev); return st->bops->write_mask(st, AD7616_CONFIGURATION_REGISTER, AD7616_OS_MASK, val << 2); } static int ad7606_write_scale_sw(struct iio_dev *indio_dev, int ch, int val) { struct ad7606_state *st = iio_priv(indio_dev); return ad7606_spi_write_mask(st, AD7606_RANGE_CH_ADDR(ch), AD7606_RANGE_CH_MSK(ch), AD7606_RANGE_CH_MODE(ch, val)); } static int ad7606_write_os_sw(struct iio_dev *indio_dev, int val) { struct ad7606_state *st = iio_priv(indio_dev); return ad7606_spi_reg_write(st, AD7606_OS_MODE, val); } static int ad7616_sw_mode_config(struct iio_dev *indio_dev) { struct ad7606_state *st = iio_priv(indio_dev); /* * Scale can be configured individually for each channel * in software mode. */ indio_dev->channels = ad7616_sw_channels; st->write_scale = ad7616_write_scale_sw; st->write_os = &ad7616_write_os_sw; /* Activate Burst mode and SEQEN MODE */ return st->bops->write_mask(st, AD7616_CONFIGURATION_REGISTER, AD7616_BURST_MODE | AD7616_SEQEN_MODE, AD7616_BURST_MODE | AD7616_SEQEN_MODE); } static int ad7606B_sw_mode_config(struct iio_dev *indio_dev) { struct ad7606_state *st = iio_priv(indio_dev); unsigned long os[3] = {1}; /* * Software mode is enabled when all three oversampling * pins are set to high. If oversampling gpios are defined * in the device tree, then they need to be set to high, * otherwise, they must be hardwired to VDD */ if (st->gpio_os) { gpiod_set_array_value(ARRAY_SIZE(os), st->gpio_os->desc, st->gpio_os->info, os); } /* OS of 128 and 256 are available only in software mode */ st->oversampling_avail = ad7606B_oversampling_avail; st->num_os_ratios = ARRAY_SIZE(ad7606B_oversampling_avail); st->write_scale = ad7606_write_scale_sw; st->write_os = &ad7606_write_os_sw; /* Configure device spi to output on a single channel */ st->bops->reg_write(st, AD7606_CONFIGURATION_REGISTER, AD7606_SINGLE_DOUT); /* * Scale can be configured individually for each channel * in software mode. */ indio_dev->channels = ad7606b_sw_channels; return 0; } static const struct ad7606_bus_ops ad7606_spi_bops = { .read_block = ad7606_spi_read_block, }; static const struct ad7606_bus_ops ad7616_spi_bops = { .read_block = ad7606_spi_read_block, .reg_read = ad7606_spi_reg_read, .reg_write = ad7606_spi_reg_write, .write_mask = ad7606_spi_write_mask, .rd_wr_cmd = ad7616_spi_rd_wr_cmd, .sw_mode_config = ad7616_sw_mode_config, }; static const struct ad7606_bus_ops ad7606B_spi_bops = { .read_block = ad7606_spi_read_block, .reg_read = ad7606_spi_reg_read, .reg_write = ad7606_spi_reg_write, .write_mask = ad7606_spi_write_mask, .rd_wr_cmd = ad7606B_spi_rd_wr_cmd, .sw_mode_config = ad7606B_sw_mode_config, }; static int ad7606_spi_probe(struct spi_device *spi) { const struct spi_device_id *id = spi_get_device_id(spi); const struct ad7606_bus_ops *bops; switch (id->driver_data) { case ID_AD7616: bops = &ad7616_spi_bops; break; case ID_AD7606B: bops = &ad7606B_spi_bops; break; default: bops = &ad7606_spi_bops; break; } return ad7606_probe(&spi->dev, spi->irq, NULL, id->name, id->driver_data, bops); } static const struct spi_device_id ad7606_id_table[] = { { "ad7605-4", ID_AD7605_4 }, { "ad7606-4", ID_AD7606_4 }, { "ad7606-6", ID_AD7606_6 }, { "ad7606-8", ID_AD7606_8 }, { "ad7606b", ID_AD7606B }, { "ad7616", ID_AD7616 }, {} }; MODULE_DEVICE_TABLE(spi, ad7606_id_table); static const struct of_device_id ad7606_of_match[] = { { .compatible = "adi,ad7605-4" }, { .compatible = "adi,ad7606-4" }, { .compatible = "adi,ad7606-6" }, { .compatible = "adi,ad7606-8" }, { .compatible = "adi,ad7606b" }, { .compatible = "adi,ad7616" }, { }, }; MODULE_DEVICE_TABLE(of, ad7606_of_match); static struct spi_driver ad7606_driver = { .driver = { .name = "ad7606", .of_match_table = ad7606_of_match, .pm = AD7606_PM_OPS, }, .probe = ad7606_spi_probe, .id_table = ad7606_id_table, }; module_spi_driver(ad7606_driver); MODULE_AUTHOR("Michael Hennerich "); MODULE_DESCRIPTION("Analog Devices AD7606 ADC"); MODULE_LICENSE("GPL v2");