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  *   HMC1119 0.25 dB LSB, 7-Bit, Silicon Digital Attenuator
10  * Copyright 2012-2019 Analog Devices Inc.
60 		.gain_min = -6000,
64 		.gain_min = -11500,
68 		.gain_min = -31750,
79 	switch (st->type) {  in ad8366_write()
84 		st->data[0] = ch_b >> 4;  in ad8366_write()
85 		st->data[1] = (ch_b << 4) | (ch_a >> 2);  in ad8366_write()
88 		st->data[0] = ch_a & 0x1F;  in ad8366_write()
91 		st->data[0] = (ch_a & 0x3F);  in ad8366_write()
94 		st->data[0] = ch_a;  in ad8366_write()
98 	ret = spi_write(st->spi, st->data, indio_dev->num_channels);  in ad8366_write()
100 		dev_err(&indio_dev->dev, "write failed (%d)", ret);  in ad8366_write()
115 	mutex_lock(&st->lock);  in ad8366_read_raw()
118 		code = st->ch[chan->channel];  in ad8366_read_raw()
120 		switch (st->type) {  in ad8366_read_raw()
125 			gain = 15000 - code * 1000;  in ad8366_read_raw()
128 			gain = 20000 - 31500 + code * 500;  in ad8366_read_raw()
131 			gain = -1 * code * 250;  in ad8366_read_raw()
142 		ret = -EINVAL;  in ad8366_read_raw()
144 	mutex_unlock(&st->lock);  in ad8366_read_raw()
156 	struct ad8366_info *inf = st->info;  in ad8366_write_raw()
162 		gain = (val * 1000) - (val2 / 1000);  in ad8366_write_raw()
166 	if (gain > inf->gain_max || gain < inf->gain_min)  in ad8366_write_raw()
167 		return -EINVAL;  in ad8366_write_raw()
169 	switch (st->type) {  in ad8366_write_raw()
171 		code = (gain - 4500) / 253;  in ad8366_write_raw()
174 		code = (15000 - gain) / 1000;  in ad8366_write_raw()
177 		code = ((gain - 500 - 20000) / 500) & 0x3F;  in ad8366_write_raw()
184 	mutex_lock(&st->lock);  in ad8366_write_raw()
187 		st->ch[chan->channel] = code;  in ad8366_write_raw()
188 		ret = ad8366_write(indio_dev, st->ch[0], st->ch[1]);  in ad8366_write_raw()
191 		ret = -EINVAL;  in ad8366_write_raw()
193 	mutex_unlock(&st->lock);  in ad8366_write_raw()
206 		return -EINVAL;  in ad8366_write_raw_get_fmt()
239 	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));  in ad8366_probe()
241 		return -ENOMEM;  in ad8366_probe()
245 	st->reg = devm_regulator_get(&spi->dev, "vcc");  in ad8366_probe()
246 	if (!IS_ERR(st->reg)) {  in ad8366_probe()
247 		ret = regulator_enable(st->reg);  in ad8366_probe()
253 	mutex_init(&st->lock);  in ad8366_probe()
254 	st->spi = spi;  in ad8366_probe()
255 	st->type = spi_get_device_id(spi)->driver_data;  in ad8366_probe()
257 	switch (st->type) {  in ad8366_probe()
259 		indio_dev->channels = ad8366_channels;  in ad8366_probe()
260 		indio_dev->num_channels = ARRAY_SIZE(ad8366_channels);  in ad8366_probe()
265 		st->reset_gpio = devm_gpiod_get_optional(&spi->dev, "reset", GPIOD_OUT_HIGH);  in ad8366_probe()
266 		if (IS_ERR(st->reset_gpio)) {  in ad8366_probe()
267 			ret = PTR_ERR(st->reset_gpio);  in ad8366_probe()
270 		indio_dev->channels = ada4961_channels;  in ad8366_probe()
271 		indio_dev->num_channels = ARRAY_SIZE(ada4961_channels);  in ad8366_probe()
274 		dev_err(&spi->dev, "Invalid device ID\n");  in ad8366_probe()
275 		ret = -EINVAL;  in ad8366_probe()
279 	st->info = &ad8366_infos[st->type];  in ad8366_probe()
280 	indio_dev->name = spi_get_device_id(spi)->name;  in ad8366_probe()
281 	indio_dev->info = &ad8366_info;  in ad8366_probe()
282 	indio_dev->modes = INDIO_DIRECT_MODE;  in ad8366_probe()
295 	if (!IS_ERR(st->reg))  in ad8366_probe()
296 		regulator_disable(st->reg);  in ad8366_probe()
305 	struct regulator *reg = st->reg;  in ad8366_remove()
333 MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
334 MODULE_DESCRIPTION("Analog Devices AD8366 and similar Gain Amplifiers");