1 // SPDX-License-Identifier: GPL-2.0-only
3  * Analog Devices AD9467 SPI ADC driver
5  * Copyright 2012-2020 Analog Devices Inc.
25 #include <linux/iio/adc/adi-axi-adc.h>
28  * ADI High-Speed ADC common spi interface registers
29  * See Application-Note AN-877:
30  *   https://www.analog.com/media/en/technical-documentation/application-notes/AN-877.pdf
81  * Analog Devices AD9265 16-Bit, 125/105/80 MSPS ADC
89  * Analog Devices AD9434 12-Bit, 370/500 MSPS ADC
97  * Analog Devices AD9467 16-Bit, 200/250 MSPS ADC
164 	struct spi_device *spi = st->spi;  in ad9467_reg_access()
168 		guard(mutex)(&st->lock);  in ad9467_reg_access()
203 	const struct adi_axi_adc_chip_info *info = conv->chip_info;  in __ad9467_get_scale()
204 	const struct iio_chan_spec *chan = &info->channels[0];  in __ad9467_get_scale()
207 	tmp = (info->scale_table[index][0] * 1000000ULL) >>  in __ad9467_get_scale()
208 			chan->scan_type.realbits;  in __ad9467_get_scale()
278 	const struct adi_axi_adc_chip_info *info = conv->chip_info;  in ad9467_get_scale()
284 	ret = ad9467_spi_read(st->spi, AN877_ADC_REG_VREF);  in ad9467_get_scale()
288 	vref_val = ret & info1->vref_mask;  in ad9467_get_scale()
290 	for (i = 0; i < info->num_scales; i++) {  in ad9467_get_scale()
291 		if (vref_val == info->scale_table[i][1])  in ad9467_get_scale()
295 	if (i == info->num_scales)  in ad9467_get_scale()
296 		return -ERANGE;  in ad9467_get_scale()
305 	const struct adi_axi_adc_chip_info *info = conv->chip_info;  in ad9467_set_scale()
312 		return -EINVAL;  in ad9467_set_scale()
314 	for (i = 0; i < info->num_scales; i++) {  in ad9467_set_scale()
319 		guard(mutex)(&st->lock);  in ad9467_set_scale()
320 		ret = ad9467_spi_write(st->spi, AN877_ADC_REG_VREF,  in ad9467_set_scale()
321 				       info->scale_table[i][1]);  in ad9467_set_scale()
325 		return ad9467_spi_write(st->spi, AN877_ADC_REG_TRANSFER,  in ad9467_set_scale()
329 	return -EINVAL;  in ad9467_set_scale()
342 		*val = clk_get_rate(st->clk);  in ad9467_read_raw()
346 		return -EINVAL;  in ad9467_read_raw()
354 	const struct adi_axi_adc_chip_info *info = conv->chip_info;  in ad9467_write_raw()
362 		r_clk = clk_round_rate(st->clk, val);  in ad9467_write_raw()
363 		if (r_clk < 0 || r_clk > info->max_rate) {  in ad9467_write_raw()
364 			dev_warn(&st->spi->dev,  in ad9467_write_raw()
365 				 "Error setting ADC sample rate %ld", r_clk);  in ad9467_write_raw()
366 			return -EINVAL;  in ad9467_write_raw()
369 		return clk_set_rate(st->clk, r_clk);  in ad9467_write_raw()
371 		return -EINVAL;  in ad9467_write_raw()
380 	const struct adi_axi_adc_chip_info *info = conv->chip_info;  in ad9467_read_avail()
385 		*vals = (const int *)st->scales;  in ad9467_read_avail()
388 		*length = info->num_scales * 2;  in ad9467_read_avail()
391 		return -EINVAL;  in ad9467_read_avail()
409 	const struct adi_axi_adc_chip_info *info = conv->chip_info;  in ad9467_scale_fill()
413 	st->scales = devm_kmalloc_array(&st->spi->dev, info->num_scales,  in ad9467_scale_fill()
414 					sizeof(*st->scales), GFP_KERNEL);  in ad9467_scale_fill()
415 	if (!st->scales)  in ad9467_scale_fill()
416 		return -ENOMEM;  in ad9467_scale_fill()
418 	for (i = 0; i < info->num_scales; i++) {  in ad9467_scale_fill()
420 		st->scales[i][0] = val1;  in ad9467_scale_fill()
421 		st->scales[i][1] = val2;  in ad9467_scale_fill()
431 	return ad9467_outputmode_set(st->spi, st->output_mode);  in ad9467_preenable_setup()
457 	info = of_device_get_match_data(&spi->dev);  in ad9467_probe()
459 		info = (void *)spi_get_device_id(spi)->driver_data;  in ad9467_probe()
461 		return -ENODEV;  in ad9467_probe()
463 	conv = devm_adi_axi_adc_conv_register(&spi->dev, sizeof(*st));  in ad9467_probe()
468 	st->spi = spi;  in ad9467_probe()
470 	st->clk = devm_clk_get_enabled(&spi->dev, "adc-clk");  in ad9467_probe()
471 	if (IS_ERR(st->clk))  in ad9467_probe()
472 		return PTR_ERR(st->clk);  in ad9467_probe()
474 	st->pwrdown_gpio = devm_gpiod_get_optional(&spi->dev, "powerdown",  in ad9467_probe()
476 	if (IS_ERR(st->pwrdown_gpio))  in ad9467_probe()
477 		return PTR_ERR(st->pwrdown_gpio);  in ad9467_probe()
479 	ret = ad9467_reset(&spi->dev);  in ad9467_probe()
483 	conv->chip_info = &info->axi_adc_info;  in ad9467_probe()
490 	if (id != conv->chip_info->id) {  in ad9467_probe()
491 		dev_err(&spi->dev, "Mismatch CHIP_ID, got 0x%X, expected 0x%X\n",  in ad9467_probe()
492 			id, conv->chip_info->id);  in ad9467_probe()
493 		return -ENODEV;  in ad9467_probe()
496 	conv->reg_access = ad9467_reg_access;  in ad9467_probe()
497 	conv->write_raw = ad9467_write_raw;  in ad9467_probe()
498 	conv->read_raw = ad9467_read_raw;  in ad9467_probe()
499 	conv->read_avail = ad9467_read_avail;  in ad9467_probe()
500 	conv->preenable_setup = ad9467_preenable_setup;  in ad9467_probe()
502 	st->output_mode = info->default_output_mode |  in ad9467_probe()
535 MODULE_DESCRIPTION("Analog Devices AD9467 ADC driver");