// SPDX-License-Identifier: GPL-2.0 /* * AD7606 Parallel Interface ADC driver * * Copyright 2011 - 2024 Analog Devices Inc. * Copyright 2024 BayLibre SAS. */ #include #include #include #include #include #include #include #include #include #include #include "ad7606.h" static const struct iio_chan_spec ad7606b_bi_channels[] = { AD7606_BI_CHANNEL(0), AD7606_BI_CHANNEL(1), AD7606_BI_CHANNEL(2), AD7606_BI_CHANNEL(3), AD7606_BI_CHANNEL(4), AD7606_BI_CHANNEL(5), AD7606_BI_CHANNEL(6), AD7606_BI_CHANNEL(7), }; static int ad7606_bi_update_scan_mode(struct iio_dev *indio_dev, const unsigned long *scan_mask) { struct ad7606_state *st = iio_priv(indio_dev); unsigned int c, ret; for (c = 0; c < indio_dev->num_channels; c++) { if (test_bit(c, scan_mask)) ret = iio_backend_chan_enable(st->back, c); else ret = iio_backend_chan_disable(st->back, c); if (ret) return ret; } return 0; } static int ad7606_bi_setup_iio_backend(struct device *dev, struct iio_dev *indio_dev) { struct ad7606_state *st = iio_priv(indio_dev); unsigned int ret, c; struct iio_backend_data_fmt data = { .sign_extend = true, .enable = true, }; st->back = devm_iio_backend_get(dev, NULL); if (IS_ERR(st->back)) return PTR_ERR(st->back); /* If the device is iio_backend powered the PWM is mandatory */ if (!st->cnvst_pwm) return dev_err_probe(st->dev, -EINVAL, "A PWM is mandatory when using backend.\n"); ret = devm_iio_backend_request_buffer(dev, st->back, indio_dev); if (ret) return ret; ret = devm_iio_backend_enable(dev, st->back); if (ret) return ret; for (c = 0; c < indio_dev->num_channels; c++) { ret = iio_backend_data_format_set(st->back, c, &data); if (ret) return ret; } indio_dev->channels = ad7606b_bi_channels; indio_dev->num_channels = 8; return 0; } static const struct ad7606_bus_ops ad7606_bi_bops = { .iio_backend_config = ad7606_bi_setup_iio_backend, .update_scan_mode = ad7606_bi_update_scan_mode, }; static int ad7606_par16_read_block(struct device *dev, int count, void *buf) { struct iio_dev *indio_dev = dev_get_drvdata(dev); struct ad7606_state *st = iio_priv(indio_dev); /* * On the parallel interface, the frstdata signal is set to high while * and after reading the sample of the first channel and low for all * other channels. This can be used to check that the incoming data is * correctly aligned. During normal operation the data should never * become unaligned, but some glitch or electrostatic discharge might * cause an extra read or clock cycle. Monitoring the frstdata signal * allows to recover from such failure situations. */ int num = count; u16 *_buf = buf; if (st->gpio_frstdata) { insw((unsigned long)st->base_address, _buf, 1); if (!gpiod_get_value(st->gpio_frstdata)) { ad7606_reset(st); return -EIO; } _buf++; num--; } insw((unsigned long)st->base_address, _buf, num); return 0; } static const struct ad7606_bus_ops ad7606_par16_bops = { .read_block = ad7606_par16_read_block, }; static int ad7606_par8_read_block(struct device *dev, int count, void *buf) { struct iio_dev *indio_dev = dev_get_drvdata(dev); struct ad7606_state *st = iio_priv(indio_dev); /* * On the parallel interface, the frstdata signal is set to high while * and after reading the sample of the first channel and low for all * other channels. This can be used to check that the incoming data is * correctly aligned. During normal operation the data should never * become unaligned, but some glitch or electrostatic discharge might * cause an extra read or clock cycle. Monitoring the frstdata signal * allows to recover from such failure situations. */ int num = count; u16 *_buf = buf; if (st->gpio_frstdata) { insb((unsigned long)st->base_address, _buf, 2); if (!gpiod_get_value(st->gpio_frstdata)) { ad7606_reset(st); return -EIO; } _buf++; num--; } insb((unsigned long)st->base_address, _buf, num * 2); return 0; } static const struct ad7606_bus_ops ad7606_par8_bops = { .read_block = ad7606_par8_read_block, }; static int ad7606_par_probe(struct platform_device *pdev) { const struct ad7606_chip_info *chip_info; const struct platform_device_id *id; struct resource *res; void __iomem *addr; resource_size_t remap_size; int irq; /* * If a firmware node is available (ACPI or DT), platform_device_id is null * and we must use get_match_data. */ if (dev_fwnode(&pdev->dev)) { chip_info = device_get_match_data(&pdev->dev); if (device_property_present(&pdev->dev, "io-backends")) /* * If a backend is available ,call the core probe with backend * bops, otherwise use the former bops. */ return ad7606_probe(&pdev->dev, 0, NULL, chip_info, &ad7606_bi_bops); } else { id = platform_get_device_id(pdev); chip_info = (const struct ad7606_chip_info *)id->driver_data; } irq = platform_get_irq(pdev, 0); if (irq < 0) return irq; addr = devm_platform_get_and_ioremap_resource(pdev, 0, &res); if (IS_ERR(addr)) return PTR_ERR(addr); remap_size = resource_size(res); return ad7606_probe(&pdev->dev, irq, addr, chip_info, remap_size > 1 ? &ad7606_par16_bops : &ad7606_par8_bops); } static const struct platform_device_id ad7606_driver_ids[] = { { .name = "ad7605-4", .driver_data = (kernel_ulong_t)&ad7605_4_info, }, { .name = "ad7606-4", .driver_data = (kernel_ulong_t)&ad7606_4_info, }, { .name = "ad7606-6", .driver_data = (kernel_ulong_t)&ad7606_6_info, }, { .name = "ad7606-8", .driver_data = (kernel_ulong_t)&ad7606_8_info, }, { .name = "ad7606b", .driver_data = (kernel_ulong_t)&ad7606b_info, }, { .name = "ad7607", .driver_data = (kernel_ulong_t)&ad7607_info, }, { .name = "ad7608", .driver_data = (kernel_ulong_t)&ad7608_info, }, { .name = "ad7609", .driver_data = (kernel_ulong_t)&ad7609_info, }, { } }; MODULE_DEVICE_TABLE(platform, ad7606_driver_ids); static const struct of_device_id ad7606_of_match[] = { { .compatible = "adi,ad7605-4", .data = &ad7605_4_info }, { .compatible = "adi,ad7606-4", .data = &ad7606_4_info }, { .compatible = "adi,ad7606-6", .data = &ad7606_6_info }, { .compatible = "adi,ad7606-8", .data = &ad7606_8_info }, { .compatible = "adi,ad7606b", .data = &ad7606b_info }, { .compatible = "adi,ad7607", .data = &ad7607_info }, { .compatible = "adi,ad7608", .data = &ad7608_info }, { .compatible = "adi,ad7609", .data = &ad7609_info }, { } }; MODULE_DEVICE_TABLE(of, ad7606_of_match); static struct platform_driver ad7606_driver = { .probe = ad7606_par_probe, .id_table = ad7606_driver_ids, .driver = { .name = "ad7606", .pm = AD7606_PM_OPS, .of_match_table = ad7606_of_match, }, }; module_platform_driver(ad7606_driver); MODULE_AUTHOR("Michael Hennerich "); MODULE_DESCRIPTION("Analog Devices AD7606 ADC"); MODULE_LICENSE("GPL v2"); MODULE_IMPORT_NS("IIO_AD7606"); MODULE_IMPORT_NS("IIO_BACKEND");