1 // SPDX-License-Identifier: GPL-2.0
5  *   AD8366 Dual-Digital Variable Gain Amplifier (VGA)
6  *   ADA4961 BiCMOS RF Digital Gain Amplifier (DGA)
7  *   ADL5240 Digitally controlled variable gain amplifier (VGA)
8  *   HMC792A 0.25 dB LSB GaAs MMIC 6-Bit Digital Attenuator
9  *   HMC1119 0.25 dB LSB, 7-Bit, Silicon Digital Attenuator
11  * Copyright 2012-2019 Analog Devices Inc.
62 		.gain_min = -6000,
66 		.gain_min = -11500,
70 		.gain_min = -15750,
74 		.gain_min = -31750,
85 	switch (st->type) {  in ad8366_write()
90 		st->data[0] = ch_b >> 4;  in ad8366_write()
91 		st->data[1] = (ch_b << 4) | (ch_a >> 2);  in ad8366_write()
94 		st->data[0] = ch_a & 0x1F;  in ad8366_write()
97 		st->data[0] = (ch_a & 0x3F);  in ad8366_write()
101 		st->data[0] = ch_a;  in ad8366_write()
105 	ret = spi_write(st->spi, st->data, indio_dev->num_channels);  in ad8366_write()
107 		dev_err(&indio_dev->dev, "write failed (%d)", ret);  in ad8366_write()
122 	mutex_lock(&st->lock);  in ad8366_read_raw()
125 		code = st->ch[chan->channel];  in ad8366_read_raw()
127 		switch (st->type) {  in ad8366_read_raw()
132 			gain = 15000 - code * 1000;  in ad8366_read_raw()
135 			gain = 20000 - 31500 + code * 500;  in ad8366_read_raw()
138 			gain = -1 * code * 500;  in ad8366_read_raw()
141 			gain = -1 * code * 250;  in ad8366_read_raw()
152 		ret = -EINVAL;  in ad8366_read_raw()
154 	mutex_unlock(&st->lock);  in ad8366_read_raw()
166 	const struct ad8366_info *inf = st->info;  in ad8366_write_raw()
172 		gain = (val * 1000) - (val2 / 1000);  in ad8366_write_raw()
176 	if (gain > inf->gain_max || gain < inf->gain_min)  in ad8366_write_raw()
177 		return -EINVAL;  in ad8366_write_raw()
179 	switch (st->type) {  in ad8366_write_raw()
181 		code = (gain - 4500) / 253;  in ad8366_write_raw()
184 		code = (15000 - gain) / 1000;  in ad8366_write_raw()
187 		code = ((gain - 500 - 20000) / 500) & 0x3F;  in ad8366_write_raw()
197 	mutex_lock(&st->lock);  in ad8366_write_raw()
200 		st->ch[chan->channel] = code;  in ad8366_write_raw()
201 		ret = ad8366_write(indio_dev, st->ch[0], st->ch[1]);  in ad8366_write_raw()
204 		ret = -EINVAL;  in ad8366_write_raw()
206 	mutex_unlock(&st->lock);  in ad8366_write_raw()
219 		return -EINVAL;  in ad8366_write_raw_get_fmt()
252 	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));  in ad8366_probe()
254 		return -ENOMEM;  in ad8366_probe()
258 	st->reg = devm_regulator_get(&spi->dev, "vcc");  in ad8366_probe()
259 	if (!IS_ERR(st->reg)) {  in ad8366_probe()
260 		ret = regulator_enable(st->reg);  in ad8366_probe()
266 	mutex_init(&st->lock);  in ad8366_probe()
267 	st->spi = spi;  in ad8366_probe()
268 	st->type = spi_get_device_id(spi)->driver_data;  in ad8366_probe()
270 	switch (st->type) {  in ad8366_probe()
272 		indio_dev->channels = ad8366_channels;  in ad8366_probe()
273 		indio_dev->num_channels = ARRAY_SIZE(ad8366_channels);  in ad8366_probe()
279 		st->reset_gpio = devm_gpiod_get_optional(&spi->dev, "reset", GPIOD_OUT_HIGH);  in ad8366_probe()
280 		if (IS_ERR(st->reset_gpio)) {  in ad8366_probe()
281 			ret = PTR_ERR(st->reset_gpio);  in ad8366_probe()
284 		indio_dev->channels = ada4961_channels;  in ad8366_probe()
285 		indio_dev->num_channels = ARRAY_SIZE(ada4961_channels);  in ad8366_probe()
288 		dev_err(&spi->dev, "Invalid device ID\n");  in ad8366_probe()
289 		ret = -EINVAL;  in ad8366_probe()
293 	st->info = &ad8366_infos[st->type];  in ad8366_probe()
294 	indio_dev->name = spi_get_device_id(spi)->name;  in ad8366_probe()
295 	indio_dev->info = &ad8366_info;  in ad8366_probe()
296 	indio_dev->modes = INDIO_DIRECT_MODE;  in ad8366_probe()
309 	if (!IS_ERR(st->reg))  in ad8366_probe()
310 		regulator_disable(st->reg);  in ad8366_probe()
319 	struct regulator *reg = st->reg;  in ad8366_remove()
348 MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
349 MODULE_DESCRIPTION("Analog Devices AD8366 and similar Gain Amplifiers");