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(desc: st->sw1_ch[i], value: (chan == 0) ? 1 : 0);
44 gpiod_set_value_cansleep(desc: st->sw2_ch[i], value: (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(desc: st->sw1_ch[i], value: (chan == 0) ? 0 : 1);
50 gpiod_set_value_cansleep(desc: st->sw2_ch[i], value: (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(desc: st->dsa1_gpios[i], value: value & (1 << i));
67 return 0;
68 case 1:
69 for (i = 0; i < ADMFM2000_DSA_GPIOS; i++)
70 gpiod_set_value_cansleep(desc: st->dsa2_gpios[i], value: 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(lock: &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: chan->channel,
119 value: st->gain[chan->channel]);
120 mutex_unlock(lock: &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 fwnode_handle *child;
164 struct gpio_desc **dsa;
165 struct gpio_desc **sw;
166 int ret, i;
167 bool mode;
168 u32 reg;
169
170 device_for_each_child_node(dev, child) {
171 ret = fwnode_property_read_u32(fwnode: child, propname: "reg", val: &reg);
172 if (ret) {
173 fwnode_handle_put(fwnode: child);
174 return dev_err_probe(dev, err: ret,
175 fmt: "Failed to get reg property\n");
176 }
177
178 if (reg >= indio_dev->num_channels) {
179 fwnode_handle_put(fwnode: child);
180 return dev_err_probe(dev, err: -EINVAL, fmt: "reg bigger than: %d\n",
181 indio_dev->num_channels);
182 }
183
184 if (fwnode_property_present(fwnode: child, propname: "adi,mixer-mode"))
185 mode = ADMFM2000_MIXER_MODE;
186 else
187 mode = ADMFM2000_DIRECT_IF_MODE;
188
189 switch (reg) {
190 case 0:
191 sw = st->sw1_ch;
192 dsa = st->dsa1_gpios;
193 break;
194 case 1:
195 sw = st->sw2_ch;
196 dsa = st->dsa2_gpios;
197 break;
198 default:
199 fwnode_handle_put(fwnode: child);
200 return -EINVAL;
201 }
202
203 for (i = 0; i < ADMFM2000_MODE_GPIOS; i++) {
204 sw[i] = devm_fwnode_gpiod_get_index(dev, child, con_id: "switch",
205 index: i, flags: GPIOD_OUT_LOW, NULL);
206 if (IS_ERR(ptr: sw[i])) {
207 fwnode_handle_put(fwnode: child);
208 return dev_err_probe(dev, err: PTR_ERR(ptr: sw[i]),
209 fmt: "Failed to get gpios\n");
210 }
211 }
212
213 for (i = 0; i < ADMFM2000_DSA_GPIOS; i++) {
214 dsa[i] = devm_fwnode_gpiod_get_index(dev, child,
215 con_id: "attenuation", index: i,
216 flags: GPIOD_OUT_LOW, NULL);
217 if (IS_ERR(ptr: dsa[i])) {
218 fwnode_handle_put(fwnode: child);
219 return dev_err_probe(dev, err: PTR_ERR(ptr: dsa[i]),
220 fmt: "Failed to get gpios\n");
221 }
222 }
223
224 ret = admfm2000_mode(indio_dev, chan: reg, mode);
225 if (ret) {
226 fwnode_handle_put(fwnode: child);
227 return ret;
228 }
229 }
230
231 return 0;
232}
233
234static int admfm2000_probe(struct platform_device *pdev)
235{
236 struct device *dev = &pdev->dev;
237 struct admfm2000_state *st;
238 struct iio_dev *indio_dev;
239 int ret;
240
241 indio_dev = devm_iio_device_alloc(parent: dev, sizeof_priv: sizeof(*st));
242 if (!indio_dev)
243 return -ENOMEM;
244
245 st = iio_priv(indio_dev);
246
247 indio_dev->name = "admfm2000";
248 indio_dev->num_channels = ARRAY_SIZE(admfm2000_channels);
249 indio_dev->channels = admfm2000_channels;
250 indio_dev->info = &admfm2000_info;
251 indio_dev->modes = INDIO_DIRECT_MODE;
252
253 st->gain[0] = ADMFM2000_DEFAULT_GAIN;
254 st->gain[1] = ADMFM2000_DEFAULT_GAIN;
255
256 mutex_init(&st->lock);
257
258 ret = admfm2000_channel_config(st, indio_dev);
259 if (ret)
260 return ret;
261
262 return devm_iio_device_register(dev, indio_dev);
263}
264
265static const struct of_device_id admfm2000_of_match[] = {
266 { .compatible = "adi,admfm2000" },
267 { }
268};
269MODULE_DEVICE_TABLE(of, admfm2000_of_match);
270
271static struct platform_driver admfm2000_driver = {
272 .driver = {
273 .name = "admfm2000",
274 .of_match_table = admfm2000_of_match,
275 },
276 .probe = admfm2000_probe,
277};
278module_platform_driver(admfm2000_driver);
279
280MODULE_AUTHOR("Kim Seer Paller <kimseer.paller@analog.com>");
281MODULE_DESCRIPTION("ADMFM2000 Dual Microwave Down Converter");
282MODULE_LICENSE("GPL");
283

source code of linux/drivers/iio/frequency/admfm2000.c