admfm2000.c

  1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * ADMFM2000 Dual Microwave Down Converter
  4 *
  5 * Copyright 2024 Analog Devices Inc.
  6 */
  7
  8#include <linux/device.h>
  9#include <linux/err.h>
 10#include <linux/gpio/consumer.h>
 11#include <linux/iio/iio.h>
 12#include <linux/kernel.h>
 13#include <linux/module.h>
 14#include <linux/mod_devicetable.h>
 15#include <linux/platform_device.h>
 16#include <linux/property.h>
 17
 18#define ADMFM2000_MIXER_MODE		0
 19#define ADMFM2000_DIRECT_IF_MODE	1
 20#define ADMFM2000_DSA_GPIOS		5
 21#define ADMFM2000_MODE_GPIOS		2
 22#define ADMFM2000_MAX_GAIN		0
 23#define ADMFM2000_MIN_GAIN		-31000
 24#define ADMFM2000_DEFAULT_GAIN		-0x20
 25
 26struct admfm2000_state {
 27	struct mutex			lock; /* protect sensor state */
 28	struct gpio_desc		*sw1_ch[2];
 29	struct gpio_desc		*sw2_ch[2];
 30	struct gpio_desc		*dsa1_gpios[5];
 31	struct gpio_desc		*dsa2_gpios[5];
 32	u32				gain[2];
 33};
 34
 35static int admfm2000_mode(struct iio_dev *indio_dev, u32 chan, u32 mode)
 36{
 37	struct admfm2000_state *st = iio_priv(indio_dev);
 38	int i;
 39
 40	switch (mode) {
 41	case ADMFM2000_MIXER_MODE:
 42		for (i = 0; i < ADMFM2000_MODE_GPIOS; i++) {
 43			gpiod_set_value_cansleep(st->sw1_ch[i], (chan == 0) ? 1 : 0);
 44			gpiod_set_value_cansleep(st->sw2_ch[i], (chan == 0) ? 0 : 1);
 45		}
 46		return 0;
 47	case ADMFM2000_DIRECT_IF_MODE:
 48		for (i = 0; i < ADMFM2000_MODE_GPIOS; i++) {
 49			gpiod_set_value_cansleep(st->sw1_ch[i], (chan == 0) ? 0 : 1);
 50			gpiod_set_value_cansleep(st->sw2_ch[i], (chan == 0) ? 1 : 0);
 51		}
 52		return 0;
 53	default:
 54		return -EINVAL;
 55	}
 56}
 57
 58static int admfm2000_attenuation(struct iio_dev *indio_dev, u32 chan, u32 value)
 59{
 60	struct admfm2000_state *st = iio_priv(indio_dev);
 61	int i;
 62
 63	switch (chan) {
 64	case 0:
 65		for (i = 0; i < ADMFM2000_DSA_GPIOS; i++)
 66			gpiod_set_value_cansleep(st->dsa1_gpios[i], value & (1 << i));
 67		return 0;
 68	case 1:
 69		for (i = 0; i < ADMFM2000_DSA_GPIOS; i++)
 70			gpiod_set_value_cansleep(st->dsa2_gpios[i], value & (1 << i));
 71		return 0;
 72	default:
 73		return -EINVAL;
 74	}
 75}
 76
 77static int admfm2000_read_raw(struct iio_dev *indio_dev,
 78			      struct iio_chan_spec const *chan, int *val,
 79			      int *val2, long mask)
 80{
 81	struct admfm2000_state *st = iio_priv(indio_dev);
 82	int gain;
 83
 84	switch (mask) {
 85	case IIO_CHAN_INFO_HARDWAREGAIN:
 86		mutex_lock(&st->lock);
 87		gain = ~(st->gain[chan->channel]) * -1000;
 88		*val = gain / 1000;
 89		*val2 = (gain % 1000) * 1000;
 90		mutex_unlock(&st->lock);
 91
 92		return IIO_VAL_INT_PLUS_MICRO_DB;
 93	default:
 94		return -EINVAL;
 95	}
 96}
 97
 98static int admfm2000_write_raw(struct iio_dev *indio_dev,
 99			       struct iio_chan_spec const *chan, int val,
100			       int val2, long mask)
101{
102	struct admfm2000_state *st = iio_priv(indio_dev);
103	int gain, ret;
104
105	if (val < 0)
106		gain = (val * 1000) - (val2 / 1000);
107	else
108		gain = (val * 1000) + (val2 / 1000);
109
110	if (gain > ADMFM2000_MAX_GAIN || gain < ADMFM2000_MIN_GAIN)
111		return -EINVAL;
112
113	switch (mask) {
114	case IIO_CHAN_INFO_HARDWAREGAIN:
115		mutex_lock(&st->lock);
116		st->gain[chan->channel] = ~((abs(gain) / 1000) & 0x1F);
117
118		ret = admfm2000_attenuation(indio_dev, chan->channel,
119					    st->gain[chan->channel]);
120		mutex_unlock(&st->lock);
121		return ret;
122	default:
123		return -EINVAL;
124	}
125}
126
127static int admfm2000_write_raw_get_fmt(struct iio_dev *indio_dev,
128				       struct iio_chan_spec const *chan,
129				       long mask)
130{
131	switch (mask) {
132	case IIO_CHAN_INFO_HARDWAREGAIN:
133		return IIO_VAL_INT_PLUS_MICRO_DB;
134	default:
135		return -EINVAL;
136	}
137}
138
139static const struct iio_info admfm2000_info = {
140	.read_raw = &admfm2000_read_raw,
141	.write_raw = &admfm2000_write_raw,
142	.write_raw_get_fmt = &admfm2000_write_raw_get_fmt,
143};
144
145#define ADMFM2000_CHAN(_channel) {					\
146	.type = IIO_VOLTAGE,						\
147	.output = 1,							\
148	.indexed = 1,							\
149	.channel = _channel,						\
150	.info_mask_separate = BIT(IIO_CHAN_INFO_HARDWAREGAIN),		\
151}
152
153static const struct iio_chan_spec admfm2000_channels[] = {
154	ADMFM2000_CHAN(0),
155	ADMFM2000_CHAN(1),
156};
157
158static int admfm2000_channel_config(struct admfm2000_state *st,
159				    struct iio_dev *indio_dev)
160{
161	struct platform_device *pdev = to_platform_device(indio_dev->dev.parent);
162	struct device *dev = &pdev->dev;
163	struct gpio_desc **dsa;
164	struct gpio_desc **sw;
165	int ret, i;
166	bool mode;
167	u32 reg;
168
169	device_for_each_child_node_scoped(dev, child) {
170		ret = fwnode_property_read_u32(child, "reg", &reg);
171		if (ret)
172			return dev_err_probe(dev, ret,
173					     "Failed to get reg property\n");
174
175		if (reg >= indio_dev->num_channels)
176			return dev_err_probe(dev, -EINVAL, "reg bigger than: %d\n",
177					     indio_dev->num_channels);
178
179		if (fwnode_property_present(child, "adi,mixer-mode"))
180			mode = ADMFM2000_MIXER_MODE;
181		else
182			mode = ADMFM2000_DIRECT_IF_MODE;
183
184		switch (reg) {
185		case 0:
186			sw = st->sw1_ch;
187			dsa = st->dsa1_gpios;
188			break;
189		case 1:
190			sw = st->sw2_ch;
191			dsa = st->dsa2_gpios;
192			break;
193		default:
194			return -EINVAL;
195		}
196
197		for (i = 0; i < ADMFM2000_MODE_GPIOS; i++) {
198			sw[i] = devm_fwnode_gpiod_get_index(dev, child, "switch",
199							    i, GPIOD_OUT_LOW, NULL);
200			if (IS_ERR(sw[i]))
201				return dev_err_probe(dev, PTR_ERR(sw[i]),
202						     "Failed to get gpios\n");
203		}
204
205		for (i = 0; i < ADMFM2000_DSA_GPIOS; i++) {
206			dsa[i] = devm_fwnode_gpiod_get_index(dev, child,
207							     "attenuation", i,
208							     GPIOD_OUT_LOW, NULL);
209			if (IS_ERR(dsa[i]))
210				return dev_err_probe(dev, PTR_ERR(dsa[i]),
211						     "Failed to get gpios\n");
212		}
213
214		ret = admfm2000_mode(indio_dev, reg, mode);
215		if (ret)
216			return ret;
217	}
218
219	return 0;
220}
221
222static int admfm2000_probe(struct platform_device *pdev)
223{
224	struct device *dev = &pdev->dev;
225	struct admfm2000_state *st;
226	struct iio_dev *indio_dev;
227	int ret;
228
229	indio_dev = devm_iio_device_alloc(dev, sizeof(*st));
230	if (!indio_dev)
231		return -ENOMEM;
232
233	st = iio_priv(indio_dev);
234
235	indio_dev->name = "admfm2000";
236	indio_dev->num_channels = ARRAY_SIZE(admfm2000_channels);
237	indio_dev->channels = admfm2000_channels;
238	indio_dev->info = &admfm2000_info;
239	indio_dev->modes = INDIO_DIRECT_MODE;
240
241	st->gain[0] = ADMFM2000_DEFAULT_GAIN;
242	st->gain[1] = ADMFM2000_DEFAULT_GAIN;
243
244	mutex_init(&st->lock);
245
246	ret = admfm2000_channel_config(st, indio_dev);
247	if (ret)
248		return ret;
249
250	return devm_iio_device_register(dev, indio_dev);
251}
252
253static const struct of_device_id admfm2000_of_match[] = {
254	{ .compatible = "adi,admfm2000" },
255	{ }
256};
257MODULE_DEVICE_TABLE(of, admfm2000_of_match);
258
259static struct platform_driver admfm2000_driver = {
260	.driver = {
261		.name = "admfm2000",
262		.of_match_table = admfm2000_of_match,
263	},
264	.probe = admfm2000_probe,
265};
266module_platform_driver(admfm2000_driver);
267
268MODULE_AUTHOR("Kim Seer Paller <kimseer.paller@analog.com>");
269MODULE_DESCRIPTION("ADMFM2000 Dual Microwave Down Converter");
270MODULE_LICENSE("GPL");