| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * AD7606 SPI ADC driver |
| * |
| * Copyright 2011 Analog Devices Inc. |
| */ |
| |
| #include <linux/err.h> |
| #include <linux/module.h> |
| #include <linux/spi/spi.h> |
| #include <linux/types.h> |
| |
| #include <linux/iio/iio.h> |
| #include "ad7606.h" |
| |
| #define MAX_SPI_FREQ_HZ 23500000 /* VDRIVE above 4.75 V */ |
| |
| 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), |
| AD7606_SW_CHANNEL(0, 16), |
| AD7606_SW_CHANNEL(1, 16), |
| AD7606_SW_CHANNEL(2, 16), |
| AD7606_SW_CHANNEL(3, 16), |
| AD7606_SW_CHANNEL(4, 16), |
| AD7606_SW_CHANNEL(5, 16), |
| AD7606_SW_CHANNEL(6, 16), |
| AD7606_SW_CHANNEL(7, 16), |
| }; |
| |
| static const struct iio_chan_spec ad7606c_18_sw_channels[] = { |
| IIO_CHAN_SOFT_TIMESTAMP(8), |
| AD7606_SW_CHANNEL(0, 18), |
| AD7606_SW_CHANNEL(1, 18), |
| AD7606_SW_CHANNEL(2, 18), |
| AD7606_SW_CHANNEL(3, 18), |
| AD7606_SW_CHANNEL(4, 18), |
| AD7606_SW_CHANNEL(5, 18), |
| AD7606_SW_CHANNEL(6, 18), |
| AD7606_SW_CHANNEL(7, 18), |
| }; |
| |
| 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_read_block14to16(struct device *dev, |
| int count, void *buf) |
| { |
| struct spi_device *spi = to_spi_device(dev); |
| struct spi_transfer xfer = { |
| .bits_per_word = 14, |
| .len = count * sizeof(u16), |
| .rx_buf = buf, |
| }; |
| |
| return spi_sync_transfer(spi, &xfer, 1); |
| } |
| |
| static int ad7606_spi_read_block18to32(struct device *dev, |
| int count, void *buf) |
| { |
| struct spi_device *spi = to_spi_device(dev); |
| struct spi_transfer xfer = { |
| .bits_per_word = 18, |
| .len = count * sizeof(u32), |
| .rx_buf = buf, |
| }; |
| |
| return spi_sync_transfer(spi, &xfer, 1); |
| } |
| |
| 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 = 1, |
| }, { |
| .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 ad7616_sw_mode_config(struct iio_dev *indio_dev) |
| { |
| /* |
| * Scale can be configured individually for each channel |
| * in software mode. |
| */ |
| indio_dev->channels = ad7616_sw_channels; |
| |
| return 0; |
| } |
| |
| static int ad7606B_sw_mode_config(struct iio_dev *indio_dev) |
| { |
| struct ad7606_state *st = iio_priv(indio_dev); |
| |
| /* 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 int ad7606c_18_sw_mode_config(struct iio_dev *indio_dev) |
| { |
| int ret; |
| |
| ret = ad7606B_sw_mode_config(indio_dev); |
| if (ret) |
| return ret; |
| |
| indio_dev->channels = ad7606c_18_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 ad7607_spi_bops = { |
| .read_block = ad7606_spi_read_block14to16, |
| }; |
| |
| static const struct ad7606_bus_ops ad7608_spi_bops = { |
| .read_block = ad7606_spi_read_block18to32, |
| }; |
| |
| 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, |
| .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, |
| .rd_wr_cmd = ad7606B_spi_rd_wr_cmd, |
| .sw_mode_config = ad7606B_sw_mode_config, |
| }; |
| |
| static const struct ad7606_bus_ops ad7606c_18_spi_bops = { |
| .read_block = ad7606_spi_read_block18to32, |
| .reg_read = ad7606_spi_reg_read, |
| .reg_write = ad7606_spi_reg_write, |
| .rd_wr_cmd = ad7606B_spi_rd_wr_cmd, |
| .sw_mode_config = ad7606c_18_sw_mode_config, |
| }; |
| |
| static const struct ad7606_bus_info ad7605_4_bus_info = { |
| .chip_info = &ad7605_4_info, |
| .bops = &ad7606_spi_bops, |
| }; |
| |
| static const struct ad7606_bus_info ad7606_8_bus_info = { |
| .chip_info = &ad7606_8_info, |
| .bops = &ad7606_spi_bops, |
| }; |
| |
| static const struct ad7606_bus_info ad7606_6_bus_info = { |
| .chip_info = &ad7606_6_info, |
| .bops = &ad7606_spi_bops, |
| }; |
| |
| static const struct ad7606_bus_info ad7606_4_bus_info = { |
| .chip_info = &ad7606_4_info, |
| .bops = &ad7606_spi_bops, |
| }; |
| |
| static const struct ad7606_bus_info ad7606b_bus_info = { |
| .chip_info = &ad7606b_info, |
| .bops = &ad7606b_spi_bops, |
| }; |
| |
| static const struct ad7606_bus_info ad7606c_16_bus_info = { |
| .chip_info = &ad7606c_16_info, |
| .bops = &ad7606b_spi_bops, |
| }; |
| |
| static const struct ad7606_bus_info ad7606c_18_bus_info = { |
| .chip_info = &ad7606c_18_info, |
| .bops = &ad7606c_18_spi_bops, |
| }; |
| |
| static const struct ad7606_bus_info ad7607_bus_info = { |
| .chip_info = &ad7607_info, |
| .bops = &ad7607_spi_bops, |
| }; |
| |
| static const struct ad7606_bus_info ad7608_bus_info = { |
| .chip_info = &ad7608_info, |
| .bops = &ad7608_spi_bops, |
| }; |
| |
| static const struct ad7606_bus_info ad7609_bus_info = { |
| .chip_info = &ad7609_info, |
| .bops = &ad7608_spi_bops, |
| }; |
| |
| static const struct ad7606_bus_info ad7616_bus_info = { |
| .chip_info = &ad7616_info, |
| .bops = &ad7616_spi_bops, |
| }; |
| |
| static int ad7606_spi_probe(struct spi_device *spi) |
| { |
| const struct ad7606_bus_info *bus_info = spi_get_device_match_data(spi); |
| |
| return ad7606_probe(&spi->dev, spi->irq, NULL, |
| bus_info->chip_info, bus_info->bops); |
| } |
| |
| static const struct spi_device_id ad7606_id_table[] = { |
| { "ad7605-4", (kernel_ulong_t)&ad7605_4_bus_info }, |
| { "ad7606-4", (kernel_ulong_t)&ad7606_4_bus_info }, |
| { "ad7606-6", (kernel_ulong_t)&ad7606_6_bus_info }, |
| { "ad7606-8", (kernel_ulong_t)&ad7606_8_bus_info }, |
| { "ad7606b", (kernel_ulong_t)&ad7606b_bus_info }, |
| { "ad7606c-16", (kernel_ulong_t)&ad7606c_16_bus_info }, |
| { "ad7606c-18", (kernel_ulong_t)&ad7606c_18_bus_info }, |
| { "ad7607", (kernel_ulong_t)&ad7607_bus_info }, |
| { "ad7608", (kernel_ulong_t)&ad7608_bus_info }, |
| { "ad7609", (kernel_ulong_t)&ad7609_bus_info }, |
| { "ad7616", (kernel_ulong_t)&ad7616_bus_info }, |
| { } |
| }; |
| MODULE_DEVICE_TABLE(spi, ad7606_id_table); |
| |
| static const struct of_device_id ad7606_of_match[] = { |
| { .compatible = "adi,ad7605-4", .data = &ad7605_4_bus_info }, |
| { .compatible = "adi,ad7606-4", .data = &ad7606_4_bus_info }, |
| { .compatible = "adi,ad7606-6", .data = &ad7606_6_bus_info }, |
| { .compatible = "adi,ad7606-8", .data = &ad7606_8_bus_info }, |
| { .compatible = "adi,ad7606b", .data = &ad7606b_bus_info }, |
| { .compatible = "adi,ad7606c-16", .data = &ad7606c_16_bus_info }, |
| { .compatible = "adi,ad7606c-18", .data = &ad7606c_18_bus_info }, |
| { .compatible = "adi,ad7607", .data = &ad7607_bus_info }, |
| { .compatible = "adi,ad7608", .data = &ad7608_bus_info }, |
| { .compatible = "adi,ad7609", .data = &ad7609_bus_info }, |
| { .compatible = "adi,ad7616", .data = &ad7616_bus_info }, |
| { } |
| }; |
| 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 <michael.hennerich@analog.com>"); |
| MODULE_DESCRIPTION("Analog Devices AD7606 ADC"); |
| MODULE_LICENSE("GPL v2"); |
| MODULE_IMPORT_NS("IIO_AD7606"); |