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22#include <linux/bitops.h>
23#include <linux/kernel.h>
24#include <linux/module.h>
25#include <linux/init.h>
26#include <linux/err.h>
27#include <linux/slab.h>
28#include <linux/i2c.h>
29#include "pmbus.h"
30
31enum chips { lm25056, lm25063, lm25066, lm5064, lm5066, lm5066i };
32
33#define LM25066_READ_VAUX 0xd0
34#define LM25066_MFR_READ_IIN 0xd1
35#define LM25066_MFR_READ_PIN 0xd2
36#define LM25066_MFR_IIN_OC_WARN_LIMIT 0xd3
37#define LM25066_MFR_PIN_OP_WARN_LIMIT 0xd4
38#define LM25066_READ_PIN_PEAK 0xd5
39#define LM25066_CLEAR_PIN_PEAK 0xd6
40#define LM25066_DEVICE_SETUP 0xd9
41#define LM25066_READ_AVG_VIN 0xdc
42#define LM25066_READ_AVG_VOUT 0xdd
43#define LM25066_READ_AVG_IIN 0xde
44#define LM25066_READ_AVG_PIN 0xdf
45
46#define LM25066_DEV_SETUP_CL BIT(4)
47
48
49
50#define LM25056_VAUX_OV_WARN_LIMIT 0xe3
51#define LM25056_VAUX_UV_WARN_LIMIT 0xe4
52
53#define LM25056_MFR_STS_VAUX_OV_WARN BIT(1)
54#define LM25056_MFR_STS_VAUX_UV_WARN BIT(0)
55
56
57
58#define LM25063_READ_VOUT_MAX 0xe5
59#define LM25063_READ_VOUT_MIN 0xe6
60
61struct __coeff {
62 short m, b, R;
63};
64
65#define PSC_CURRENT_IN_L (PSC_NUM_CLASSES)
66#define PSC_POWER_L (PSC_NUM_CLASSES + 1)
67
68static struct __coeff lm25066_coeff[6][PSC_NUM_CLASSES + 2] = {
69 [lm25056] = {
70 [PSC_VOLTAGE_IN] = {
71 .m = 16296,
72 .R = -2,
73 },
74 [PSC_CURRENT_IN] = {
75 .m = 13797,
76 .R = -2,
77 },
78 [PSC_CURRENT_IN_L] = {
79 .m = 6726,
80 .R = -2,
81 },
82 [PSC_POWER] = {
83 .m = 5501,
84 .R = -3,
85 },
86 [PSC_POWER_L] = {
87 .m = 26882,
88 .R = -4,
89 },
90 [PSC_TEMPERATURE] = {
91 .m = 1580,
92 .b = -14500,
93 .R = -2,
94 },
95 },
96 [lm25066] = {
97 [PSC_VOLTAGE_IN] = {
98 .m = 22070,
99 .R = -2,
100 },
101 [PSC_VOLTAGE_OUT] = {
102 .m = 22070,
103 .R = -2,
104 },
105 [PSC_CURRENT_IN] = {
106 .m = 13661,
107 .R = -2,
108 },
109 [PSC_CURRENT_IN_L] = {
110 .m = 6852,
111 .R = -2,
112 },
113 [PSC_POWER] = {
114 .m = 736,
115 .R = -2,
116 },
117 [PSC_POWER_L] = {
118 .m = 369,
119 .R = -2,
120 },
121 [PSC_TEMPERATURE] = {
122 .m = 16,
123 },
124 },
125 [lm25063] = {
126 [PSC_VOLTAGE_IN] = {
127 .m = 16000,
128 .R = -2,
129 },
130 [PSC_VOLTAGE_OUT] = {
131 .m = 16000,
132 .R = -2,
133 },
134 [PSC_CURRENT_IN] = {
135 .m = 10000,
136 .R = -2,
137 },
138 [PSC_CURRENT_IN_L] = {
139 .m = 10000,
140 .R = -2,
141 },
142 [PSC_POWER] = {
143 .m = 5000,
144 .R = -3,
145 },
146 [PSC_POWER_L] = {
147 .m = 5000,
148 .R = -3,
149 },
150 [PSC_TEMPERATURE] = {
151 .m = 15596,
152 .R = -3,
153 },
154 },
155 [lm5064] = {
156 [PSC_VOLTAGE_IN] = {
157 .m = 4611,
158 .R = -2,
159 },
160 [PSC_VOLTAGE_OUT] = {
161 .m = 4621,
162 .R = -2,
163 },
164 [PSC_CURRENT_IN] = {
165 .m = 10742,
166 .R = -2,
167 },
168 [PSC_CURRENT_IN_L] = {
169 .m = 5456,
170 .R = -2,
171 },
172 [PSC_POWER] = {
173 .m = 1204,
174 .R = -3,
175 },
176 [PSC_POWER_L] = {
177 .m = 612,
178 .R = -3,
179 },
180 [PSC_TEMPERATURE] = {
181 .m = 16,
182 },
183 },
184 [lm5066] = {
185 [PSC_VOLTAGE_IN] = {
186 .m = 4587,
187 .R = -2,
188 },
189 [PSC_VOLTAGE_OUT] = {
190 .m = 4587,
191 .R = -2,
192 },
193 [PSC_CURRENT_IN] = {
194 .m = 10753,
195 .R = -2,
196 },
197 [PSC_CURRENT_IN_L] = {
198 .m = 5405,
199 .R = -2,
200 },
201 [PSC_POWER] = {
202 .m = 1204,
203 .R = -3,
204 },
205 [PSC_POWER_L] = {
206 .m = 605,
207 .R = -3,
208 },
209 [PSC_TEMPERATURE] = {
210 .m = 16,
211 },
212 },
213 [lm5066i] = {
214 [PSC_VOLTAGE_IN] = {
215 .m = 4617,
216 .b = -140,
217 .R = -2,
218 },
219 [PSC_VOLTAGE_OUT] = {
220 .m = 4602,
221 .b = 500,
222 .R = -2,
223 },
224 [PSC_CURRENT_IN] = {
225 .m = 15076,
226 .b = -504,
227 .R = -2,
228 },
229 [PSC_CURRENT_IN_L] = {
230 .m = 7645,
231 .b = 100,
232 .R = -2,
233 },
234 [PSC_POWER] = {
235 .m = 1701,
236 .b = -4000,
237 .R = -3,
238 },
239 [PSC_POWER_L] = {
240 .m = 861,
241 .b = -965,
242 .R = -3,
243 },
244 [PSC_TEMPERATURE] = {
245 .m = 16,
246 },
247 },
248};
249
250struct lm25066_data {
251 int id;
252 u16 rlimit;
253 struct pmbus_driver_info info;
254};
255
256#define to_lm25066_data(x) container_of(x, struct lm25066_data, info)
257
258static int lm25066_read_word_data(struct i2c_client *client, int page, int reg)
259{
260 const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
261 const struct lm25066_data *data = to_lm25066_data(info);
262 int ret;
263
264 switch (reg) {
265 case PMBUS_VIRT_READ_VMON:
266 ret = pmbus_read_word_data(client, 0, LM25066_READ_VAUX);
267 if (ret < 0)
268 break;
269
270 switch (data->id) {
271 case lm25056:
272
273 ret = DIV_ROUND_CLOSEST(ret * 293, 6140);
274 break;
275 case lm25063:
276
277 ret = DIV_ROUND_CLOSEST(ret * 20, 625);
278 break;
279 case lm25066:
280
281 ret = DIV_ROUND_CLOSEST(ret * 2832, 45400);
282 break;
283 case lm5064:
284
285 ret = DIV_ROUND_CLOSEST(ret * 70, 453);
286 break;
287 case lm5066:
288 case lm5066i:
289
290 ret = DIV_ROUND_CLOSEST(ret * 725, 2180);
291 break;
292 }
293 break;
294 case PMBUS_READ_IIN:
295 ret = pmbus_read_word_data(client, 0, LM25066_MFR_READ_IIN);
296 break;
297 case PMBUS_READ_PIN:
298 ret = pmbus_read_word_data(client, 0, LM25066_MFR_READ_PIN);
299 break;
300 case PMBUS_IIN_OC_WARN_LIMIT:
301 ret = pmbus_read_word_data(client, 0,
302 LM25066_MFR_IIN_OC_WARN_LIMIT);
303 break;
304 case PMBUS_PIN_OP_WARN_LIMIT:
305 ret = pmbus_read_word_data(client, 0,
306 LM25066_MFR_PIN_OP_WARN_LIMIT);
307 break;
308 case PMBUS_VIRT_READ_VIN_AVG:
309 ret = pmbus_read_word_data(client, 0, LM25066_READ_AVG_VIN);
310 break;
311 case PMBUS_VIRT_READ_VOUT_AVG:
312 ret = pmbus_read_word_data(client, 0, LM25066_READ_AVG_VOUT);
313 break;
314 case PMBUS_VIRT_READ_IIN_AVG:
315 ret = pmbus_read_word_data(client, 0, LM25066_READ_AVG_IIN);
316 break;
317 case PMBUS_VIRT_READ_PIN_AVG:
318 ret = pmbus_read_word_data(client, 0, LM25066_READ_AVG_PIN);
319 break;
320 case PMBUS_VIRT_READ_PIN_MAX:
321 ret = pmbus_read_word_data(client, 0, LM25066_READ_PIN_PEAK);
322 break;
323 case PMBUS_VIRT_RESET_PIN_HISTORY:
324 ret = 0;
325 break;
326 default:
327 ret = -ENODATA;
328 break;
329 }
330 return ret;
331}
332
333static int lm25063_read_word_data(struct i2c_client *client, int page, int reg)
334{
335 int ret;
336
337 switch (reg) {
338 case PMBUS_VIRT_READ_VOUT_MAX:
339 ret = pmbus_read_word_data(client, 0, LM25063_READ_VOUT_MAX);
340 break;
341 case PMBUS_VIRT_READ_VOUT_MIN:
342 ret = pmbus_read_word_data(client, 0, LM25063_READ_VOUT_MIN);
343 break;
344 default:
345 ret = lm25066_read_word_data(client, page, reg);
346 break;
347 }
348 return ret;
349}
350
351static int lm25056_read_word_data(struct i2c_client *client, int page, int reg)
352{
353 int ret;
354
355 switch (reg) {
356 case PMBUS_VIRT_VMON_UV_WARN_LIMIT:
357 ret = pmbus_read_word_data(client, 0,
358 LM25056_VAUX_UV_WARN_LIMIT);
359 if (ret < 0)
360 break;
361
362 ret = DIV_ROUND_CLOSEST(ret * 293, 6140);
363 break;
364 case PMBUS_VIRT_VMON_OV_WARN_LIMIT:
365 ret = pmbus_read_word_data(client, 0,
366 LM25056_VAUX_OV_WARN_LIMIT);
367 if (ret < 0)
368 break;
369
370 ret = DIV_ROUND_CLOSEST(ret * 293, 6140);
371 break;
372 default:
373 ret = lm25066_read_word_data(client, page, reg);
374 break;
375 }
376 return ret;
377}
378
379static int lm25056_read_byte_data(struct i2c_client *client, int page, int reg)
380{
381 int ret, s;
382
383 switch (reg) {
384 case PMBUS_VIRT_STATUS_VMON:
385 ret = pmbus_read_byte_data(client, 0,
386 PMBUS_STATUS_MFR_SPECIFIC);
387 if (ret < 0)
388 break;
389 s = 0;
390 if (ret & LM25056_MFR_STS_VAUX_UV_WARN)
391 s |= PB_VOLTAGE_UV_WARNING;
392 if (ret & LM25056_MFR_STS_VAUX_OV_WARN)
393 s |= PB_VOLTAGE_OV_WARNING;
394 ret = s;
395 break;
396 default:
397 ret = -ENODATA;
398 break;
399 }
400 return ret;
401}
402
403static int lm25066_write_word_data(struct i2c_client *client, int page, int reg,
404 u16 word)
405{
406 const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
407 const struct lm25066_data *data = to_lm25066_data(info);
408 int ret;
409
410 switch (reg) {
411 case PMBUS_POUT_OP_FAULT_LIMIT:
412 case PMBUS_POUT_OP_WARN_LIMIT:
413 case PMBUS_VOUT_UV_WARN_LIMIT:
414 case PMBUS_OT_FAULT_LIMIT:
415 case PMBUS_OT_WARN_LIMIT:
416 case PMBUS_IIN_OC_FAULT_LIMIT:
417 case PMBUS_VIN_UV_WARN_LIMIT:
418 case PMBUS_VIN_UV_FAULT_LIMIT:
419 case PMBUS_VIN_OV_FAULT_LIMIT:
420 case PMBUS_VIN_OV_WARN_LIMIT:
421 word = ((s16)word < 0) ? 0 : clamp_val(word, 0, data->rlimit);
422 ret = pmbus_write_word_data(client, 0, reg, word);
423 pmbus_clear_cache(client);
424 break;
425 case PMBUS_IIN_OC_WARN_LIMIT:
426 word = ((s16)word < 0) ? 0 : clamp_val(word, 0, data->rlimit);
427 ret = pmbus_write_word_data(client, 0,
428 LM25066_MFR_IIN_OC_WARN_LIMIT,
429 word);
430 pmbus_clear_cache(client);
431 break;
432 case PMBUS_PIN_OP_WARN_LIMIT:
433 word = ((s16)word < 0) ? 0 : clamp_val(word, 0, data->rlimit);
434 ret = pmbus_write_word_data(client, 0,
435 LM25066_MFR_PIN_OP_WARN_LIMIT,
436 word);
437 pmbus_clear_cache(client);
438 break;
439 case PMBUS_VIRT_VMON_UV_WARN_LIMIT:
440
441 word = DIV_ROUND_CLOSEST((int)word * 6140, 293);
442 word = ((s16)word < 0) ? 0 : clamp_val(word, 0, data->rlimit);
443 ret = pmbus_write_word_data(client, 0,
444 LM25056_VAUX_UV_WARN_LIMIT, word);
445 pmbus_clear_cache(client);
446 break;
447 case PMBUS_VIRT_VMON_OV_WARN_LIMIT:
448
449 word = DIV_ROUND_CLOSEST((int)word * 6140, 293);
450 word = ((s16)word < 0) ? 0 : clamp_val(word, 0, data->rlimit);
451 ret = pmbus_write_word_data(client, 0,
452 LM25056_VAUX_OV_WARN_LIMIT, word);
453 pmbus_clear_cache(client);
454 break;
455 case PMBUS_VIRT_RESET_PIN_HISTORY:
456 ret = pmbus_write_byte(client, 0, LM25066_CLEAR_PIN_PEAK);
457 break;
458 default:
459 ret = -ENODATA;
460 break;
461 }
462 return ret;
463}
464
465static int lm25066_probe(struct i2c_client *client,
466 const struct i2c_device_id *id)
467{
468 int config;
469 struct lm25066_data *data;
470 struct pmbus_driver_info *info;
471 struct __coeff *coeff;
472
473 if (!i2c_check_functionality(client->adapter,
474 I2C_FUNC_SMBUS_READ_BYTE_DATA))
475 return -ENODEV;
476
477 data = devm_kzalloc(&client->dev, sizeof(struct lm25066_data),
478 GFP_KERNEL);
479 if (!data)
480 return -ENOMEM;
481
482 config = i2c_smbus_read_byte_data(client, LM25066_DEVICE_SETUP);
483 if (config < 0)
484 return config;
485
486 data->id = id->driver_data;
487 info = &data->info;
488
489 info->pages = 1;
490 info->format[PSC_VOLTAGE_IN] = direct;
491 info->format[PSC_VOLTAGE_OUT] = direct;
492 info->format[PSC_CURRENT_IN] = direct;
493 info->format[PSC_TEMPERATURE] = direct;
494 info->format[PSC_POWER] = direct;
495
496 info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VMON
497 | PMBUS_HAVE_PIN | PMBUS_HAVE_IIN | PMBUS_HAVE_STATUS_INPUT
498 | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP;
499
500 if (data->id == lm25056) {
501 info->func[0] |= PMBUS_HAVE_STATUS_VMON;
502 info->read_word_data = lm25056_read_word_data;
503 info->read_byte_data = lm25056_read_byte_data;
504 data->rlimit = 0x0fff;
505 } else if (data->id == lm25063) {
506 info->func[0] |= PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
507 | PMBUS_HAVE_POUT;
508 info->read_word_data = lm25063_read_word_data;
509 data->rlimit = 0xffff;
510 } else {
511 info->func[0] |= PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT;
512 info->read_word_data = lm25066_read_word_data;
513 data->rlimit = 0x0fff;
514 }
515 info->write_word_data = lm25066_write_word_data;
516
517 coeff = &lm25066_coeff[data->id][0];
518 info->m[PSC_TEMPERATURE] = coeff[PSC_TEMPERATURE].m;
519 info->b[PSC_TEMPERATURE] = coeff[PSC_TEMPERATURE].b;
520 info->R[PSC_TEMPERATURE] = coeff[PSC_TEMPERATURE].R;
521 info->m[PSC_VOLTAGE_IN] = coeff[PSC_VOLTAGE_IN].m;
522 info->b[PSC_VOLTAGE_IN] = coeff[PSC_VOLTAGE_IN].b;
523 info->R[PSC_VOLTAGE_IN] = coeff[PSC_VOLTAGE_IN].R;
524 info->m[PSC_VOLTAGE_OUT] = coeff[PSC_VOLTAGE_OUT].m;
525 info->b[PSC_VOLTAGE_OUT] = coeff[PSC_VOLTAGE_OUT].b;
526 info->R[PSC_VOLTAGE_OUT] = coeff[PSC_VOLTAGE_OUT].R;
527 info->R[PSC_CURRENT_IN] = coeff[PSC_CURRENT_IN].R;
528 info->R[PSC_POWER] = coeff[PSC_POWER].R;
529 if (config & LM25066_DEV_SETUP_CL) {
530 info->m[PSC_CURRENT_IN] = coeff[PSC_CURRENT_IN_L].m;
531 info->b[PSC_CURRENT_IN] = coeff[PSC_CURRENT_IN_L].b;
532 info->m[PSC_POWER] = coeff[PSC_POWER_L].m;
533 info->b[PSC_POWER] = coeff[PSC_POWER_L].b;
534 } else {
535 info->m[PSC_CURRENT_IN] = coeff[PSC_CURRENT_IN].m;
536 info->b[PSC_CURRENT_IN] = coeff[PSC_CURRENT_IN].b;
537 info->m[PSC_POWER] = coeff[PSC_POWER].m;
538 info->b[PSC_POWER] = coeff[PSC_POWER].b;
539 }
540
541 return pmbus_do_probe(client, id, info);
542}
543
544static const struct i2c_device_id lm25066_id[] = {
545 {"lm25056", lm25056},
546 {"lm25063", lm25063},
547 {"lm25066", lm25066},
548 {"lm5064", lm5064},
549 {"lm5066", lm5066},
550 {"lm5066i", lm5066i},
551 { }
552};
553
554MODULE_DEVICE_TABLE(i2c, lm25066_id);
555
556
557static struct i2c_driver lm25066_driver = {
558 .driver = {
559 .name = "lm25066",
560 },
561 .probe = lm25066_probe,
562 .remove = pmbus_do_remove,
563 .id_table = lm25066_id,
564};
565
566module_i2c_driver(lm25066_driver);
567
568MODULE_AUTHOR("Guenter Roeck");
569MODULE_DESCRIPTION("PMBus driver for LM25066 and compatible chips");
570MODULE_LICENSE("GPL");
571
