1 // SPDX-License-Identifier: GPL-2.0-only
3  * Analog Devices AD9467 SPI ADC driver
5  * Copyright 2012-2020 Analog Devices Inc.
24 #include <linux/iio/adc/adi-axi-adc.h>
27  * ADI High-Speed ADC common spi interface registers
28  * See Application-Note AN-877:
29  *   https://www.analog.com/media/en/technical-documentation/application-notes/AN-877.pdf
80  * Analog Devices AD9265 16-Bit, 125/105/80 MSPS ADC
88  * Analog Devices AD9434 12-Bit, 370/500 MSPS ADC
96  * Analog Devices AD9467 16-Bit, 200/250 MSPS ADC
161 	struct spi_device *spi = st->spi;  in ad9467_reg_access()
199 	const struct adi_axi_adc_chip_info *info = conv->chip_info;  in __ad9467_get_scale()
200 	const struct iio_chan_spec *chan = &info->channels[0];  in __ad9467_get_scale()
203 	tmp = (info->scale_table[index][0] * 1000000ULL) >>  in __ad9467_get_scale()
204 			chan->scan_type.realbits;  in __ad9467_get_scale()
274 	const struct adi_axi_adc_chip_info *info = conv->chip_info;  in ad9467_get_scale()
280 	ret = ad9467_spi_read(st->spi, AN877_ADC_REG_VREF);  in ad9467_get_scale()
284 	vref_val = ret & info1->vref_mask;  in ad9467_get_scale()
286 	for (i = 0; i < info->num_scales; i++) {  in ad9467_get_scale()
287 		if (vref_val == info->scale_table[i][1])  in ad9467_get_scale()
291 	if (i == info->num_scales)  in ad9467_get_scale()
292 		return -ERANGE;  in ad9467_get_scale()
301 	const struct adi_axi_adc_chip_info *info = conv->chip_info;  in ad9467_set_scale()
308 		return -EINVAL;  in ad9467_set_scale()
310 	for (i = 0; i < info->num_scales; i++) {  in ad9467_set_scale()
315 		ret = ad9467_spi_write(st->spi, AN877_ADC_REG_VREF,  in ad9467_set_scale()
316 				       info->scale_table[i][1]);  in ad9467_set_scale()
320 		return ad9467_spi_write(st->spi, AN877_ADC_REG_TRANSFER,  in ad9467_set_scale()
324 	return -EINVAL;  in ad9467_set_scale()
337 		*val = clk_get_rate(st->clk);  in ad9467_read_raw()
341 		return -EINVAL;  in ad9467_read_raw()
349 	const struct adi_axi_adc_chip_info *info = conv->chip_info;  in ad9467_write_raw()
357 		r_clk = clk_round_rate(st->clk, val);  in ad9467_write_raw()
358 		if (r_clk < 0 || r_clk > info->max_rate) {  in ad9467_write_raw()
359 			dev_warn(&st->spi->dev,  in ad9467_write_raw()
360 				 "Error setting ADC sample rate %ld", r_clk);  in ad9467_write_raw()
361 			return -EINVAL;  in ad9467_write_raw()
364 		return clk_set_rate(st->clk, r_clk);  in ad9467_write_raw()
366 		return -EINVAL;  in ad9467_write_raw()
375 	const struct adi_axi_adc_chip_info *info = conv->chip_info;  in ad9467_read_avail()
380 		*vals = (const int *)st->scales;  in ad9467_read_avail()
383 		*length = info->num_scales * 2;  in ad9467_read_avail()
386 		return -EINVAL;  in ad9467_read_avail()
404 	const struct adi_axi_adc_chip_info *info = conv->chip_info;  in ad9467_scale_fill()
408 	st->scales = devm_kmalloc_array(&st->spi->dev, info->num_scales,  in ad9467_scale_fill()
409 					sizeof(*st->scales), GFP_KERNEL);  in ad9467_scale_fill()
410 	if (!st->scales)  in ad9467_scale_fill()
411 		return -ENOMEM;  in ad9467_scale_fill()
413 	for (i = 0; i < info->num_scales; i++) {  in ad9467_scale_fill()
415 		st->scales[i][0] = val1;  in ad9467_scale_fill()
416 		st->scales[i][1] = val2;  in ad9467_scale_fill()
426 	return ad9467_outputmode_set(st->spi, st->output_mode);  in ad9467_preenable_setup()
452 	info = of_device_get_match_data(&spi->dev);  in ad9467_probe()
454 		return -ENODEV;  in ad9467_probe()
456 	conv = devm_adi_axi_adc_conv_register(&spi->dev, sizeof(*st));  in ad9467_probe()
461 	st->spi = spi;  in ad9467_probe()
463 	st->clk = devm_clk_get_enabled(&spi->dev, "adc-clk");  in ad9467_probe()
464 	if (IS_ERR(st->clk))  in ad9467_probe()
465 		return PTR_ERR(st->clk);  in ad9467_probe()
467 	st->pwrdown_gpio = devm_gpiod_get_optional(&spi->dev, "powerdown",  in ad9467_probe()
469 	if (IS_ERR(st->pwrdown_gpio))  in ad9467_probe()
470 		return PTR_ERR(st->pwrdown_gpio);  in ad9467_probe()
472 	ret = ad9467_reset(&spi->dev);  in ad9467_probe()
478 	conv->chip_info = &info->axi_adc_info;  in ad9467_probe()
485 	if (id != conv->chip_info->id) {  in ad9467_probe()
486 		dev_err(&spi->dev, "Mismatch CHIP_ID, got 0x%X, expected 0x%X\n",  in ad9467_probe()
487 			id, conv->chip_info->id);  in ad9467_probe()
488 		return -ENODEV;  in ad9467_probe()
491 	conv->reg_access = ad9467_reg_access;  in ad9467_probe()
492 	conv->write_raw = ad9467_write_raw;  in ad9467_probe()
493 	conv->read_raw = ad9467_read_raw;  in ad9467_probe()
494 	conv->read_avail = ad9467_read_avail;  in ad9467_probe()
495 	conv->preenable_setup = ad9467_preenable_setup;  in ad9467_probe()
497 	st->output_mode = info->default_output_mode |  in ad9467_probe()
521 MODULE_DESCRIPTION("Analog Devices AD9467 ADC driver");