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28#include <linux/module.h>
29#include <linux/i2c.h>
30#include <linux/err.h>
31#include <linux/mod_devicetable.h>
32#include <linux/property.h>
33
34#include <linux/iio/iio.h>
35
36struct mcp4531_cfg {
37 int wipers;
38 int avail[3];
39 int kohms;
40};
41
42enum mcp4531_type {
43 MCP453x_502,
44 MCP453x_103,
45 MCP453x_503,
46 MCP453x_104,
47 MCP454x_502,
48 MCP454x_103,
49 MCP454x_503,
50 MCP454x_104,
51 MCP455x_502,
52 MCP455x_103,
53 MCP455x_503,
54 MCP455x_104,
55 MCP456x_502,
56 MCP456x_103,
57 MCP456x_503,
58 MCP456x_104,
59 MCP463x_502,
60 MCP463x_103,
61 MCP463x_503,
62 MCP463x_104,
63 MCP464x_502,
64 MCP464x_103,
65 MCP464x_503,
66 MCP464x_104,
67 MCP465x_502,
68 MCP465x_103,
69 MCP465x_503,
70 MCP465x_104,
71 MCP466x_502,
72 MCP466x_103,
73 MCP466x_503,
74 MCP466x_104,
75};
76
77static const struct mcp4531_cfg mcp4531_cfg[] = {
78 [MCP453x_502] = { .wipers = 1, .avail = { 0, 1, 128 }, .kohms = 5, },
79 [MCP453x_103] = { .wipers = 1, .avail = { 0, 1, 128 }, .kohms = 10, },
80 [MCP453x_503] = { .wipers = 1, .avail = { 0, 1, 128 }, .kohms = 50, },
81 [MCP453x_104] = { .wipers = 1, .avail = { 0, 1, 128 }, .kohms = 100, },
82 [MCP454x_502] = { .wipers = 1, .avail = { 0, 1, 128 }, .kohms = 5, },
83 [MCP454x_103] = { .wipers = 1, .avail = { 0, 1, 128 }, .kohms = 10, },
84 [MCP454x_503] = { .wipers = 1, .avail = { 0, 1, 128 }, .kohms = 50, },
85 [MCP454x_104] = { .wipers = 1, .avail = { 0, 1, 128 }, .kohms = 100, },
86 [MCP455x_502] = { .wipers = 1, .avail = { 0, 1, 256 }, .kohms = 5, },
87 [MCP455x_103] = { .wipers = 1, .avail = { 0, 1, 256 }, .kohms = 10, },
88 [MCP455x_503] = { .wipers = 1, .avail = { 0, 1, 256 }, .kohms = 50, },
89 [MCP455x_104] = { .wipers = 1, .avail = { 0, 1, 256 }, .kohms = 100, },
90 [MCP456x_502] = { .wipers = 1, .avail = { 0, 1, 256 }, .kohms = 5, },
91 [MCP456x_103] = { .wipers = 1, .avail = { 0, 1, 256 }, .kohms = 10, },
92 [MCP456x_503] = { .wipers = 1, .avail = { 0, 1, 256 }, .kohms = 50, },
93 [MCP456x_104] = { .wipers = 1, .avail = { 0, 1, 256 }, .kohms = 100, },
94 [MCP463x_502] = { .wipers = 2, .avail = { 0, 1, 128 }, .kohms = 5, },
95 [MCP463x_103] = { .wipers = 2, .avail = { 0, 1, 128 }, .kohms = 10, },
96 [MCP463x_503] = { .wipers = 2, .avail = { 0, 1, 128 }, .kohms = 50, },
97 [MCP463x_104] = { .wipers = 2, .avail = { 0, 1, 128 }, .kohms = 100, },
98 [MCP464x_502] = { .wipers = 2, .avail = { 0, 1, 128 }, .kohms = 5, },
99 [MCP464x_103] = { .wipers = 2, .avail = { 0, 1, 128 }, .kohms = 10, },
100 [MCP464x_503] = { .wipers = 2, .avail = { 0, 1, 128 }, .kohms = 50, },
101 [MCP464x_104] = { .wipers = 2, .avail = { 0, 1, 128 }, .kohms = 100, },
102 [MCP465x_502] = { .wipers = 2, .avail = { 0, 1, 256 }, .kohms = 5, },
103 [MCP465x_103] = { .wipers = 2, .avail = { 0, 1, 256 }, .kohms = 10, },
104 [MCP465x_503] = { .wipers = 2, .avail = { 0, 1, 256 }, .kohms = 50, },
105 [MCP465x_104] = { .wipers = 2, .avail = { 0, 1, 256 }, .kohms = 100, },
106 [MCP466x_502] = { .wipers = 2, .avail = { 0, 1, 256 }, .kohms = 5, },
107 [MCP466x_103] = { .wipers = 2, .avail = { 0, 1, 256 }, .kohms = 10, },
108 [MCP466x_503] = { .wipers = 2, .avail = { 0, 1, 256 }, .kohms = 50, },
109 [MCP466x_104] = { .wipers = 2, .avail = { 0, 1, 256 }, .kohms = 100, },
110};
111
112#define MCP4531_WRITE (0 << 2)
113#define MCP4531_INCR (1 << 2)
114#define MCP4531_DECR (2 << 2)
115#define MCP4531_READ (3 << 2)
116
117#define MCP4531_WIPER_SHIFT (4)
118
119struct mcp4531_data {
120 struct i2c_client *client;
121 const struct mcp4531_cfg *cfg;
122};
123
124#define MCP4531_CHANNEL(ch) { \
125 .type = IIO_RESISTANCE, \
126 .indexed = 1, \
127 .output = 1, \
128 .channel = (ch), \
129 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
130 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
131 .info_mask_shared_by_type_available = BIT(IIO_CHAN_INFO_RAW), \
132}
133
134static const struct iio_chan_spec mcp4531_channels[] = {
135 MCP4531_CHANNEL(0),
136 MCP4531_CHANNEL(1),
137};
138
139static int mcp4531_read_raw(struct iio_dev *indio_dev,
140 struct iio_chan_spec const *chan,
141 int *val, int *val2, long mask)
142{
143 struct mcp4531_data *data = iio_priv(indio_dev);
144 int address = chan->channel << MCP4531_WIPER_SHIFT;
145 s32 ret;
146
147 switch (mask) {
148 case IIO_CHAN_INFO_RAW:
149 ret = i2c_smbus_read_word_swapped(data->client,
150 MCP4531_READ | address);
151 if (ret < 0)
152 return ret;
153 *val = ret;
154 return IIO_VAL_INT;
155 case IIO_CHAN_INFO_SCALE:
156 *val = 1000 * data->cfg->kohms;
157 *val2 = data->cfg->avail[2];
158 return IIO_VAL_FRACTIONAL;
159 }
160
161 return -EINVAL;
162}
163
164static int mcp4531_read_avail(struct iio_dev *indio_dev,
165 struct iio_chan_spec const *chan,
166 const int **vals, int *type, int *length,
167 long mask)
168{
169 struct mcp4531_data *data = iio_priv(indio_dev);
170
171 switch (mask) {
172 case IIO_CHAN_INFO_RAW:
173 *length = ARRAY_SIZE(data->cfg->avail);
174 *vals = data->cfg->avail;
175 *type = IIO_VAL_INT;
176 return IIO_AVAIL_RANGE;
177 }
178
179 return -EINVAL;
180}
181
182static int mcp4531_write_raw(struct iio_dev *indio_dev,
183 struct iio_chan_spec const *chan,
184 int val, int val2, long mask)
185{
186 struct mcp4531_data *data = iio_priv(indio_dev);
187 int address = chan->channel << MCP4531_WIPER_SHIFT;
188
189 switch (mask) {
190 case IIO_CHAN_INFO_RAW:
191 if (val > data->cfg->avail[2] || val < 0)
192 return -EINVAL;
193 break;
194 default:
195 return -EINVAL;
196 }
197
198 return i2c_smbus_write_byte_data(data->client,
199 MCP4531_WRITE | address | (val >> 8),
200 val & 0xff);
201}
202
203static const struct iio_info mcp4531_info = {
204 .read_raw = mcp4531_read_raw,
205 .read_avail = mcp4531_read_avail,
206 .write_raw = mcp4531_write_raw,
207};
208
209static const struct i2c_device_id mcp4531_id[] = {
210 { "mcp4531-502", MCP453x_502 },
211 { "mcp4531-103", MCP453x_103 },
212 { "mcp4531-503", MCP453x_503 },
213 { "mcp4531-104", MCP453x_104 },
214 { "mcp4532-502", MCP453x_502 },
215 { "mcp4532-103", MCP453x_103 },
216 { "mcp4532-503", MCP453x_503 },
217 { "mcp4532-104", MCP453x_104 },
218 { "mcp4541-502", MCP454x_502 },
219 { "mcp4541-103", MCP454x_103 },
220 { "mcp4541-503", MCP454x_503 },
221 { "mcp4541-104", MCP454x_104 },
222 { "mcp4542-502", MCP454x_502 },
223 { "mcp4542-103", MCP454x_103 },
224 { "mcp4542-503", MCP454x_503 },
225 { "mcp4542-104", MCP454x_104 },
226 { "mcp4551-502", MCP455x_502 },
227 { "mcp4551-103", MCP455x_103 },
228 { "mcp4551-503", MCP455x_503 },
229 { "mcp4551-104", MCP455x_104 },
230 { "mcp4552-502", MCP455x_502 },
231 { "mcp4552-103", MCP455x_103 },
232 { "mcp4552-503", MCP455x_503 },
233 { "mcp4552-104", MCP455x_104 },
234 { "mcp4561-502", MCP456x_502 },
235 { "mcp4561-103", MCP456x_103 },
236 { "mcp4561-503", MCP456x_503 },
237 { "mcp4561-104", MCP456x_104 },
238 { "mcp4562-502", MCP456x_502 },
239 { "mcp4562-103", MCP456x_103 },
240 { "mcp4562-503", MCP456x_503 },
241 { "mcp4562-104", MCP456x_104 },
242 { "mcp4631-502", MCP463x_502 },
243 { "mcp4631-103", MCP463x_103 },
244 { "mcp4631-503", MCP463x_503 },
245 { "mcp4631-104", MCP463x_104 },
246 { "mcp4632-502", MCP463x_502 },
247 { "mcp4632-103", MCP463x_103 },
248 { "mcp4632-503", MCP463x_503 },
249 { "mcp4632-104", MCP463x_104 },
250 { "mcp4641-502", MCP464x_502 },
251 { "mcp4641-103", MCP464x_103 },
252 { "mcp4641-503", MCP464x_503 },
253 { "mcp4641-104", MCP464x_104 },
254 { "mcp4642-502", MCP464x_502 },
255 { "mcp4642-103", MCP464x_103 },
256 { "mcp4642-503", MCP464x_503 },
257 { "mcp4642-104", MCP464x_104 },
258 { "mcp4651-502", MCP465x_502 },
259 { "mcp4651-103", MCP465x_103 },
260 { "mcp4651-503", MCP465x_503 },
261 { "mcp4651-104", MCP465x_104 },
262 { "mcp4652-502", MCP465x_502 },
263 { "mcp4652-103", MCP465x_103 },
264 { "mcp4652-503", MCP465x_503 },
265 { "mcp4652-104", MCP465x_104 },
266 { "mcp4661-502", MCP466x_502 },
267 { "mcp4661-103", MCP466x_103 },
268 { "mcp4661-503", MCP466x_503 },
269 { "mcp4661-104", MCP466x_104 },
270 { "mcp4662-502", MCP466x_502 },
271 { "mcp4662-103", MCP466x_103 },
272 { "mcp4662-503", MCP466x_503 },
273 { "mcp4662-104", MCP466x_104 },
274 {}
275};
276MODULE_DEVICE_TABLE(i2c, mcp4531_id);
277
278#define MCP4531_COMPATIBLE(of_compatible, cfg) { \
279 .compatible = of_compatible, \
280 .data = &mcp4531_cfg[cfg], \
281}
282
283static const struct of_device_id mcp4531_of_match[] = {
284 MCP4531_COMPATIBLE("microchip,mcp4531-502", MCP453x_502),
285 MCP4531_COMPATIBLE("microchip,mcp4531-103", MCP453x_103),
286 MCP4531_COMPATIBLE("microchip,mcp4531-503", MCP453x_503),
287 MCP4531_COMPATIBLE("microchip,mcp4531-104", MCP453x_104),
288 MCP4531_COMPATIBLE("microchip,mcp4532-502", MCP453x_502),
289 MCP4531_COMPATIBLE("microchip,mcp4532-103", MCP453x_103),
290 MCP4531_COMPATIBLE("microchip,mcp4532-503", MCP453x_503),
291 MCP4531_COMPATIBLE("microchip,mcp4532-104", MCP453x_104),
292 MCP4531_COMPATIBLE("microchip,mcp4541-502", MCP454x_502),
293 MCP4531_COMPATIBLE("microchip,mcp4541-103", MCP454x_103),
294 MCP4531_COMPATIBLE("microchip,mcp4541-503", MCP454x_503),
295 MCP4531_COMPATIBLE("microchip,mcp4541-104", MCP454x_104),
296 MCP4531_COMPATIBLE("microchip,mcp4542-502", MCP454x_502),
297 MCP4531_COMPATIBLE("microchip,mcp4542-103", MCP454x_103),
298 MCP4531_COMPATIBLE("microchip,mcp4542-503", MCP454x_503),
299 MCP4531_COMPATIBLE("microchip,mcp4542-104", MCP454x_104),
300 MCP4531_COMPATIBLE("microchip,mcp4551-502", MCP455x_502),
301 MCP4531_COMPATIBLE("microchip,mcp4551-103", MCP455x_103),
302 MCP4531_COMPATIBLE("microchip,mcp4551-503", MCP455x_503),
303 MCP4531_COMPATIBLE("microchip,mcp4551-104", MCP455x_104),
304 MCP4531_COMPATIBLE("microchip,mcp4552-502", MCP455x_502),
305 MCP4531_COMPATIBLE("microchip,mcp4552-103", MCP455x_103),
306 MCP4531_COMPATIBLE("microchip,mcp4552-503", MCP455x_503),
307 MCP4531_COMPATIBLE("microchip,mcp4552-104", MCP455x_104),
308 MCP4531_COMPATIBLE("microchip,mcp4561-502", MCP456x_502),
309 MCP4531_COMPATIBLE("microchip,mcp4561-103", MCP456x_103),
310 MCP4531_COMPATIBLE("microchip,mcp4561-503", MCP456x_503),
311 MCP4531_COMPATIBLE("microchip,mcp4561-104", MCP456x_104),
312 MCP4531_COMPATIBLE("microchip,mcp4562-502", MCP456x_502),
313 MCP4531_COMPATIBLE("microchip,mcp4562-103", MCP456x_103),
314 MCP4531_COMPATIBLE("microchip,mcp4562-503", MCP456x_503),
315 MCP4531_COMPATIBLE("microchip,mcp4562-104", MCP456x_104),
316 MCP4531_COMPATIBLE("microchip,mcp4631-502", MCP463x_502),
317 MCP4531_COMPATIBLE("microchip,mcp4631-103", MCP463x_103),
318 MCP4531_COMPATIBLE("microchip,mcp4631-503", MCP463x_503),
319 MCP4531_COMPATIBLE("microchip,mcp4631-104", MCP463x_104),
320 MCP4531_COMPATIBLE("microchip,mcp4632-502", MCP463x_502),
321 MCP4531_COMPATIBLE("microchip,mcp4632-103", MCP463x_103),
322 MCP4531_COMPATIBLE("microchip,mcp4632-503", MCP463x_503),
323 MCP4531_COMPATIBLE("microchip,mcp4632-104", MCP463x_104),
324 MCP4531_COMPATIBLE("microchip,mcp4641-502", MCP464x_502),
325 MCP4531_COMPATIBLE("microchip,mcp4641-103", MCP464x_103),
326 MCP4531_COMPATIBLE("microchip,mcp4641-503", MCP464x_503),
327 MCP4531_COMPATIBLE("microchip,mcp4641-104", MCP464x_104),
328 MCP4531_COMPATIBLE("microchip,mcp4642-502", MCP464x_502),
329 MCP4531_COMPATIBLE("microchip,mcp4642-103", MCP464x_103),
330 MCP4531_COMPATIBLE("microchip,mcp4642-503", MCP464x_503),
331 MCP4531_COMPATIBLE("microchip,mcp4642-104", MCP464x_104),
332 MCP4531_COMPATIBLE("microchip,mcp4651-502", MCP465x_502),
333 MCP4531_COMPATIBLE("microchip,mcp4651-103", MCP465x_103),
334 MCP4531_COMPATIBLE("microchip,mcp4651-503", MCP465x_503),
335 MCP4531_COMPATIBLE("microchip,mcp4651-104", MCP465x_104),
336 MCP4531_COMPATIBLE("microchip,mcp4652-502", MCP465x_502),
337 MCP4531_COMPATIBLE("microchip,mcp4652-103", MCP465x_103),
338 MCP4531_COMPATIBLE("microchip,mcp4652-503", MCP465x_503),
339 MCP4531_COMPATIBLE("microchip,mcp4652-104", MCP465x_104),
340 MCP4531_COMPATIBLE("microchip,mcp4661-502", MCP466x_502),
341 MCP4531_COMPATIBLE("microchip,mcp4661-103", MCP466x_103),
342 MCP4531_COMPATIBLE("microchip,mcp4661-503", MCP466x_503),
343 MCP4531_COMPATIBLE("microchip,mcp4661-104", MCP466x_104),
344 MCP4531_COMPATIBLE("microchip,mcp4662-502", MCP466x_502),
345 MCP4531_COMPATIBLE("microchip,mcp4662-103", MCP466x_103),
346 MCP4531_COMPATIBLE("microchip,mcp4662-503", MCP466x_503),
347 MCP4531_COMPATIBLE("microchip,mcp4662-104", MCP466x_104),
348 { }
349};
350MODULE_DEVICE_TABLE(of, mcp4531_of_match);
351
352static int mcp4531_probe(struct i2c_client *client)
353{
354 struct device *dev = &client->dev;
355 struct mcp4531_data *data;
356 struct iio_dev *indio_dev;
357
358 if (!i2c_check_functionality(client->adapter,
359 I2C_FUNC_SMBUS_WORD_DATA)) {
360 dev_err(dev, "SMBUS Word Data not supported\n");
361 return -EOPNOTSUPP;
362 }
363
364 indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
365 if (!indio_dev)
366 return -ENOMEM;
367 data = iio_priv(indio_dev);
368 i2c_set_clientdata(client, indio_dev);
369 data->client = client;
370
371 data->cfg = device_get_match_data(dev);
372 if (!data->cfg)
373 data->cfg = &mcp4531_cfg[i2c_match_id(mcp4531_id, client)->driver_data];
374
375 indio_dev->info = &mcp4531_info;
376 indio_dev->channels = mcp4531_channels;
377 indio_dev->num_channels = data->cfg->wipers;
378 indio_dev->name = client->name;
379
380 return devm_iio_device_register(dev, indio_dev);
381}
382
383static struct i2c_driver mcp4531_driver = {
384 .driver = {
385 .name = "mcp4531",
386 .of_match_table = mcp4531_of_match,
387 },
388 .probe_new = mcp4531_probe,
389 .id_table = mcp4531_id,
390};
391
392module_i2c_driver(mcp4531_driver);
393
394MODULE_AUTHOR("Peter Rosin <peda@axentia.se>");
395MODULE_DESCRIPTION("MCP4531 digital potentiometer");
396MODULE_LICENSE("GPL v2");
397
