1 // SPDX-License-Identifier: GPL-2.0-only
5  * Copyright 2015-2024 Analog Devices Inc.
65 #define AD9739A_FSC_RANGE	(AD9739A_FSC_MAX - AD9739A_FSC_MIN + 1)
69 #define AD9739A_DAC_CLK_RANGE	(AD9739A_MAX_DAC_CLK - AD9739A_MIN_DAC_CLK + 1)
70 /* as recommended by the datasheet */
86 	ret = regmap_read(st->regmap, AD9739A_REG_DEC_CNT, &mode);  in ad9739a_oper_mode_get()
93 		return -EIO;  in ad9739a_oper_mode_get()
101 	return AD9739A_MIXED_MODE - 1;  in ad9739a_oper_mode_get()
113 	if (mode == AD9739A_MIXED_MODE - 1)  in ad9739a_oper_mode_set()
116 	return regmap_update_bits(st->regmap, AD9739A_REG_DEC_CNT,  in ad9739a_oper_mode_set()
128 		*val = st->sample_rate;  in ad9739a_read_raw()
132 		return -EINVAL;  in ad9739a_read_raw()
140 	return iio_backend_data_source_set(st->back, 0, IIO_BACKEND_EXTERNAL);  in ad9739a_buffer_preenable()
147 	return iio_backend_data_source_set(st->back, 0,  in ad9739a_buffer_postdisable()
177 	ret = regmap_set_bits(st->regmap, AD9739A_REG_MODE, AD9739A_RESET_MASK);  in ad9739a_reset()
183 	return regmap_clear_bits(st->regmap, AD9739A_REG_MODE,  in ad9739a_reset()
188  * Recommended values (as per datasheet) for the dac clk common mode voltage
208 	ret = regmap_multi_reg_write(st->regmap, ad9739a_clk_mu_ctrl,  in ad9739a_init()
215 	 * (as specified by the datasheet) until we get the lock.  in ad9739a_init()
218 		ret = regmap_write(st->regmap, AD9739A_REG_MU_CNT4,  in ad9739a_init()
224 		ret = regmap_write(st->regmap, AD9739A_REG_MU_CNT1,  in ad9739a_init()
230 		ret = regmap_read_poll_timeout(st->regmap, AD9739A_REG_MU_STAT1,  in ad9739a_init()
233 		if (ret && ret != -ETIMEDOUT)  in ad9739a_init()
243 		ret = regmap_update_bits(st->regmap, AD9739A_REG_LVDS_REC_CNT4,  in ad9739a_init()
250 		ret = regmap_write(st->regmap, AD9739A_REG_LVDS_REC_CNT1, 0);  in ad9739a_init()
255 		 * Re-enable the loop so it falls out of lock and begins the  in ad9739a_init()
258 		ret = regmap_set_bits(st->regmap, AD9739A_REG_LVDS_REC_CNT1,  in ad9739a_init()
264 		ret = regmap_read_poll_timeout(st->regmap,  in ad9739a_init()
268 		if (ret && ret != -ETIMEDOUT)  in ad9739a_init()
275 	ret = device_property_read_u32(dev, "adi,full-scale-microamp", &fsc);  in ad9739a_init()
276 	if (ret && ret == -EINVAL)  in ad9739a_init()
281 		return dev_err_probe(dev, -EINVAL,  in ad9739a_init()
290 	fsc_raw = DIV_ROUND_CLOSEST(fsc * 10 - 85800, 226);  in ad9739a_init()
292 	ret = regmap_write(st->regmap, AD9739A_REG_FSC_1, fsc_raw & 0xff);  in ad9739a_init()
296 	return regmap_update_bits(st->regmap, AD9739A_REG_FSC_2,  in ad9739a_init()
300 static const char * const ad9739a_modes_avail[] = { "normal", "mixed-mode" };
329 		.scan_index = -1,
364 	struct device *dev = &spi->dev;  in ad9739a_probe()
373 		return -ENOMEM;  in ad9739a_probe()
381 	st->sample_rate = clk_get_rate(clk);  in ad9739a_probe()
382 	if (!in_range(st->sample_rate, AD9739A_MIN_DAC_CLK,  in ad9739a_probe()
384 		return dev_err_probe(dev, -EINVAL,  in ad9739a_probe()
386 				     st->sample_rate, AD9739A_MIN_DAC_CLK,  in ad9739a_probe()
389 	st->regmap = devm_regmap_init_spi(spi, &ad9739a_regmap_config);  in ad9739a_probe()
390 	if (IS_ERR(st->regmap))  in ad9739a_probe()
391 		return PTR_ERR(st->regmap);  in ad9739a_probe()
393 	ret = regmap_read(st->regmap, AD9739A_REG_ID, &id);  in ad9739a_probe()
408 	st->back = devm_iio_backend_get(dev, NULL);  in ad9739a_probe()
409 	if (IS_ERR(st->back))  in ad9739a_probe()
410 		return PTR_ERR(st->back);  in ad9739a_probe()
412 	ret = devm_iio_backend_request_buffer(dev, st->back, indio_dev);  in ad9739a_probe()
416 	ret = iio_backend_extend_chan_spec(st->back, &ad9739a_channels[0]);  in ad9739a_probe()
420 	ret = iio_backend_set_sampling_freq(st->back, 0, st->sample_rate);  in ad9739a_probe()
424 	ret = devm_iio_backend_enable(dev, st->back);  in ad9739a_probe()
428 	indio_dev->name = "ad9739a";  in ad9739a_probe()
429 	indio_dev->info = &ad9739a_info;  in ad9739a_probe()
430 	indio_dev->channels = ad9739a_channels;  in ad9739a_probe()
431 	indio_dev->num_channels = ARRAY_SIZE(ad9739a_channels);  in ad9739a_probe()
432 	indio_dev->setup_ops = &ad9739a_buffer_setup_ops;  in ad9739a_probe()
434 	ret = devm_iio_device_register(&spi->dev, indio_dev);  in ad9739a_probe()
438 	iio_backend_debugfs_add(st->back, indio_dev);  in ad9739a_probe()