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22#include <linux/kernel.h>
23#include <linux/module.h>
24#include <linux/init.h>
25#include <linux/err.h>
26#include <linux/slab.h>
27#include <linux/i2c.h>
28#include "pmbus.h"
29
30enum chips { lm25056, lm25063, lm25066, lm5064, lm5066 };
31
32#define LM25066_READ_VAUX 0xd0
33#define LM25066_MFR_READ_IIN 0xd1
34#define LM25066_MFR_READ_PIN 0xd2
35#define LM25066_MFR_IIN_OC_WARN_LIMIT 0xd3
36#define LM25066_MFR_PIN_OP_WARN_LIMIT 0xd4
37#define LM25066_READ_PIN_PEAK 0xd5
38#define LM25066_CLEAR_PIN_PEAK 0xd6
39#define LM25066_DEVICE_SETUP 0xd9
40#define LM25066_READ_AVG_VIN 0xdc
41#define LM25066_READ_AVG_VOUT 0xdd
42#define LM25066_READ_AVG_IIN 0xde
43#define LM25066_READ_AVG_PIN 0xdf
44
45#define LM25066_DEV_SETUP_CL (1 << 4)
46
47
48
49#define LM25056_VAUX_OV_WARN_LIMIT 0xe3
50#define LM25056_VAUX_UV_WARN_LIMIT 0xe4
51
52#define LM25056_MFR_STS_VAUX_OV_WARN (1 << 1)
53#define LM25056_MFR_STS_VAUX_UV_WARN (1 << 0)
54
55
56
57#define LM25063_READ_VOUT_MAX 0xe5
58#define LM25063_READ_VOUT_MIN 0xe6
59
60struct __coeff {
61 short m, b, R;
62};
63
64#define PSC_CURRENT_IN_L (PSC_NUM_CLASSES)
65#define PSC_POWER_L (PSC_NUM_CLASSES + 1)
66
67static struct __coeff lm25066_coeff[5][PSC_NUM_CLASSES + 2] = {
68 [lm25056] = {
69 [PSC_VOLTAGE_IN] = {
70 .m = 16296,
71 .R = -2,
72 },
73 [PSC_CURRENT_IN] = {
74 .m = 13797,
75 .R = -2,
76 },
77 [PSC_CURRENT_IN_L] = {
78 .m = 6726,
79 .R = -2,
80 },
81 [PSC_POWER] = {
82 .m = 5501,
83 .R = -3,
84 },
85 [PSC_POWER_L] = {
86 .m = 26882,
87 .R = -4,
88 },
89 [PSC_TEMPERATURE] = {
90 .m = 1580,
91 .b = -14500,
92 .R = -2,
93 },
94 },
95 [lm25066] = {
96 [PSC_VOLTAGE_IN] = {
97 .m = 22070,
98 .R = -2,
99 },
100 [PSC_VOLTAGE_OUT] = {
101 .m = 22070,
102 .R = -2,
103 },
104 [PSC_CURRENT_IN] = {
105 .m = 13661,
106 .R = -2,
107 },
108 [PSC_CURRENT_IN_L] = {
109 .m = 6852,
110 .R = -2,
111 },
112 [PSC_POWER] = {
113 .m = 736,
114 .R = -2,
115 },
116 [PSC_POWER_L] = {
117 .m = 369,
118 .R = -2,
119 },
120 [PSC_TEMPERATURE] = {
121 .m = 16,
122 },
123 },
124 [lm25063] = {
125 [PSC_VOLTAGE_IN] = {
126 .m = 16000,
127 .R = -2,
128 },
129 [PSC_VOLTAGE_OUT] = {
130 .m = 16000,
131 .R = -2,
132 },
133 [PSC_CURRENT_IN] = {
134 .m = 10000,
135 .R = -2,
136 },
137 [PSC_CURRENT_IN_L] = {
138 .m = 10000,
139 .R = -2,
140 },
141 [PSC_POWER] = {
142 .m = 5000,
143 .R = -3,
144 },
145 [PSC_POWER_L] = {
146 .m = 5000,
147 .R = -3,
148 },
149 [PSC_TEMPERATURE] = {
150 .m = 15596,
151 .R = -3,
152 },
153 },
154 [lm5064] = {
155 [PSC_VOLTAGE_IN] = {
156 .m = 4611,
157 .R = -2,
158 },
159 [PSC_VOLTAGE_OUT] = {
160 .m = 4621,
161 .R = -2,
162 },
163 [PSC_CURRENT_IN] = {
164 .m = 10742,
165 .R = -2,
166 },
167 [PSC_CURRENT_IN_L] = {
168 .m = 5456,
169 .R = -2,
170 },
171 [PSC_POWER] = {
172 .m = 1204,
173 .R = -3,
174 },
175 [PSC_POWER_L] = {
176 .m = 612,
177 .R = -3,
178 },
179 [PSC_TEMPERATURE] = {
180 .m = 16,
181 },
182 },
183 [lm5066] = {
184 [PSC_VOLTAGE_IN] = {
185 .m = 4587,
186 .R = -2,
187 },
188 [PSC_VOLTAGE_OUT] = {
189 .m = 4587,
190 .R = -2,
191 },
192 [PSC_CURRENT_IN] = {
193 .m = 10753,
194 .R = -2,
195 },
196 [PSC_CURRENT_IN_L] = {
197 .m = 5405,
198 .R = -2,
199 },
200 [PSC_POWER] = {
201 .m = 1204,
202 .R = -3,
203 },
204 [PSC_POWER_L] = {
205 .m = 605,
206 .R = -3,
207 },
208 [PSC_TEMPERATURE] = {
209 .m = 16,
210 },
211 },
212};
213
214struct lm25066_data {
215 int id;
216 u16 rlimit;
217 struct pmbus_driver_info info;
218};
219
220#define to_lm25066_data(x) container_of(x, struct lm25066_data, info)
221
222static int lm25066_read_word_data(struct i2c_client *client, int page, int reg)
223{
224 const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
225 const struct lm25066_data *data = to_lm25066_data(info);
226 int ret;
227
228 switch (reg) {
229 case PMBUS_VIRT_READ_VMON:
230 ret = pmbus_read_word_data(client, 0, LM25066_READ_VAUX);
231 if (ret < 0)
232 break;
233
234 switch (data->id) {
235 case lm25056:
236
237 ret = DIV_ROUND_CLOSEST(ret * 293, 6140);
238 break;
239 case lm25063:
240
241 ret = DIV_ROUND_CLOSEST(ret * 20, 625);
242 break;
243 case lm25066:
244
245 ret = DIV_ROUND_CLOSEST(ret * 2832, 45400);
246 break;
247 case lm5064:
248
249 ret = DIV_ROUND_CLOSEST(ret * 70, 453);
250 break;
251 case lm5066:
252
253 ret = DIV_ROUND_CLOSEST(ret * 725, 2180);
254 break;
255 }
256 break;
257 case PMBUS_READ_IIN:
258 ret = pmbus_read_word_data(client, 0, LM25066_MFR_READ_IIN);
259 break;
260 case PMBUS_READ_PIN:
261 ret = pmbus_read_word_data(client, 0, LM25066_MFR_READ_PIN);
262 break;
263 case PMBUS_IIN_OC_WARN_LIMIT:
264 ret = pmbus_read_word_data(client, 0,
265 LM25066_MFR_IIN_OC_WARN_LIMIT);
266 break;
267 case PMBUS_PIN_OP_WARN_LIMIT:
268 ret = pmbus_read_word_data(client, 0,
269 LM25066_MFR_PIN_OP_WARN_LIMIT);
270 break;
271 case PMBUS_VIRT_READ_VIN_AVG:
272 ret = pmbus_read_word_data(client, 0, LM25066_READ_AVG_VIN);
273 break;
274 case PMBUS_VIRT_READ_VOUT_AVG:
275 ret = pmbus_read_word_data(client, 0, LM25066_READ_AVG_VOUT);
276 break;
277 case PMBUS_VIRT_READ_IIN_AVG:
278 ret = pmbus_read_word_data(client, 0, LM25066_READ_AVG_IIN);
279 break;
280 case PMBUS_VIRT_READ_PIN_AVG:
281 ret = pmbus_read_word_data(client, 0, LM25066_READ_AVG_PIN);
282 break;
283 case PMBUS_VIRT_READ_PIN_MAX:
284 ret = pmbus_read_word_data(client, 0, LM25066_READ_PIN_PEAK);
285 break;
286 case PMBUS_VIRT_RESET_PIN_HISTORY:
287 ret = 0;
288 break;
289 default:
290 ret = -ENODATA;
291 break;
292 }
293 return ret;
294}
295
296static int lm25063_read_word_data(struct i2c_client *client, int page, int reg)
297{
298 int ret;
299
300 switch (reg) {
301 case PMBUS_VIRT_READ_VOUT_MAX:
302 ret = pmbus_read_word_data(client, 0, LM25063_READ_VOUT_MAX);
303 break;
304 case PMBUS_VIRT_READ_VOUT_MIN:
305 ret = pmbus_read_word_data(client, 0, LM25063_READ_VOUT_MIN);
306 break;
307 default:
308 ret = lm25066_read_word_data(client, page, reg);
309 break;
310 }
311 return ret;
312}
313
314static int lm25056_read_word_data(struct i2c_client *client, int page, int reg)
315{
316 int ret;
317
318 switch (reg) {
319 case PMBUS_VIRT_VMON_UV_WARN_LIMIT:
320 ret = pmbus_read_word_data(client, 0,
321 LM25056_VAUX_UV_WARN_LIMIT);
322 if (ret < 0)
323 break;
324
325 ret = DIV_ROUND_CLOSEST(ret * 293, 6140);
326 break;
327 case PMBUS_VIRT_VMON_OV_WARN_LIMIT:
328 ret = pmbus_read_word_data(client, 0,
329 LM25056_VAUX_OV_WARN_LIMIT);
330 if (ret < 0)
331 break;
332
333 ret = DIV_ROUND_CLOSEST(ret * 293, 6140);
334 break;
335 default:
336 ret = lm25066_read_word_data(client, page, reg);
337 break;
338 }
339 return ret;
340}
341
342static int lm25056_read_byte_data(struct i2c_client *client, int page, int reg)
343{
344 int ret, s;
345
346 switch (reg) {
347 case PMBUS_VIRT_STATUS_VMON:
348 ret = pmbus_read_byte_data(client, 0,
349 PMBUS_STATUS_MFR_SPECIFIC);
350 if (ret < 0)
351 break;
352 s = 0;
353 if (ret & LM25056_MFR_STS_VAUX_UV_WARN)
354 s |= PB_VOLTAGE_UV_WARNING;
355 if (ret & LM25056_MFR_STS_VAUX_OV_WARN)
356 s |= PB_VOLTAGE_OV_WARNING;
357 ret = s;
358 break;
359 default:
360 ret = -ENODATA;
361 break;
362 }
363 return ret;
364}
365
366static int lm25066_write_word_data(struct i2c_client *client, int page, int reg,
367 u16 word)
368{
369 const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
370 const struct lm25066_data *data = to_lm25066_data(info);
371 int ret;
372
373 switch (reg) {
374 case PMBUS_POUT_OP_FAULT_LIMIT:
375 case PMBUS_POUT_OP_WARN_LIMIT:
376 case PMBUS_VOUT_UV_WARN_LIMIT:
377 case PMBUS_OT_FAULT_LIMIT:
378 case PMBUS_OT_WARN_LIMIT:
379 case PMBUS_IIN_OC_FAULT_LIMIT:
380 case PMBUS_VIN_UV_WARN_LIMIT:
381 case PMBUS_VIN_UV_FAULT_LIMIT:
382 case PMBUS_VIN_OV_FAULT_LIMIT:
383 case PMBUS_VIN_OV_WARN_LIMIT:
384 word = ((s16)word < 0) ? 0 : clamp_val(word, 0, data->rlimit);
385 ret = pmbus_write_word_data(client, 0, reg, word);
386 pmbus_clear_cache(client);
387 break;
388 case PMBUS_IIN_OC_WARN_LIMIT:
389 word = ((s16)word < 0) ? 0 : clamp_val(word, 0, data->rlimit);
390 ret = pmbus_write_word_data(client, 0,
391 LM25066_MFR_IIN_OC_WARN_LIMIT,
392 word);
393 pmbus_clear_cache(client);
394 break;
395 case PMBUS_PIN_OP_WARN_LIMIT:
396 word = ((s16)word < 0) ? 0 : clamp_val(word, 0, data->rlimit);
397 ret = pmbus_write_word_data(client, 0,
398 LM25066_MFR_PIN_OP_WARN_LIMIT,
399 word);
400 pmbus_clear_cache(client);
401 break;
402 case PMBUS_VIRT_VMON_UV_WARN_LIMIT:
403
404 word = DIV_ROUND_CLOSEST((int)word * 6140, 293);
405 word = ((s16)word < 0) ? 0 : clamp_val(word, 0, data->rlimit);
406 ret = pmbus_write_word_data(client, 0,
407 LM25056_VAUX_UV_WARN_LIMIT, word);
408 pmbus_clear_cache(client);
409 break;
410 case PMBUS_VIRT_VMON_OV_WARN_LIMIT:
411
412 word = DIV_ROUND_CLOSEST((int)word * 6140, 293);
413 word = ((s16)word < 0) ? 0 : clamp_val(word, 0, data->rlimit);
414 ret = pmbus_write_word_data(client, 0,
415 LM25056_VAUX_OV_WARN_LIMIT, word);
416 pmbus_clear_cache(client);
417 break;
418 case PMBUS_VIRT_RESET_PIN_HISTORY:
419 ret = pmbus_write_byte(client, 0, LM25066_CLEAR_PIN_PEAK);
420 break;
421 default:
422 ret = -ENODATA;
423 break;
424 }
425 return ret;
426}
427
428static int lm25066_probe(struct i2c_client *client,
429 const struct i2c_device_id *id)
430{
431 int config;
432 struct lm25066_data *data;
433 struct pmbus_driver_info *info;
434 struct __coeff *coeff;
435
436 if (!i2c_check_functionality(client->adapter,
437 I2C_FUNC_SMBUS_READ_BYTE_DATA))
438 return -ENODEV;
439
440 data = devm_kzalloc(&client->dev, sizeof(struct lm25066_data),
441 GFP_KERNEL);
442 if (!data)
443 return -ENOMEM;
444
445 config = i2c_smbus_read_byte_data(client, LM25066_DEVICE_SETUP);
446 if (config < 0)
447 return config;
448
449 data->id = id->driver_data;
450 info = &data->info;
451
452 info->pages = 1;
453 info->format[PSC_VOLTAGE_IN] = direct;
454 info->format[PSC_VOLTAGE_OUT] = direct;
455 info->format[PSC_CURRENT_IN] = direct;
456 info->format[PSC_TEMPERATURE] = direct;
457 info->format[PSC_POWER] = direct;
458
459 info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VMON
460 | PMBUS_HAVE_PIN | PMBUS_HAVE_IIN | PMBUS_HAVE_STATUS_INPUT
461 | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP;
462
463 if (data->id == lm25056) {
464 info->func[0] |= PMBUS_HAVE_STATUS_VMON;
465 info->read_word_data = lm25056_read_word_data;
466 info->read_byte_data = lm25056_read_byte_data;
467 data->rlimit = 0x0fff;
468 } else if (data->id == lm25063) {
469 info->func[0] |= PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
470 | PMBUS_HAVE_POUT;
471 info->read_word_data = lm25063_read_word_data;
472 data->rlimit = 0xffff;
473 } else {
474 info->func[0] |= PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT;
475 info->read_word_data = lm25066_read_word_data;
476 data->rlimit = 0x0fff;
477 }
478 info->write_word_data = lm25066_write_word_data;
479
480 coeff = &lm25066_coeff[data->id][0];
481 info->m[PSC_TEMPERATURE] = coeff[PSC_TEMPERATURE].m;
482 info->b[PSC_TEMPERATURE] = coeff[PSC_TEMPERATURE].b;
483 info->R[PSC_TEMPERATURE] = coeff[PSC_TEMPERATURE].R;
484 info->m[PSC_VOLTAGE_IN] = coeff[PSC_VOLTAGE_IN].m;
485 info->b[PSC_VOLTAGE_IN] = coeff[PSC_VOLTAGE_IN].b;
486 info->R[PSC_VOLTAGE_IN] = coeff[PSC_VOLTAGE_IN].R;
487 info->m[PSC_VOLTAGE_OUT] = coeff[PSC_VOLTAGE_OUT].m;
488 info->b[PSC_VOLTAGE_OUT] = coeff[PSC_VOLTAGE_OUT].b;
489 info->R[PSC_VOLTAGE_OUT] = coeff[PSC_VOLTAGE_OUT].R;
490 info->b[PSC_CURRENT_IN] = coeff[PSC_CURRENT_IN].b;
491 info->R[PSC_CURRENT_IN] = coeff[PSC_CURRENT_IN].R;
492 info->b[PSC_POWER] = coeff[PSC_POWER].b;
493 info->R[PSC_POWER] = coeff[PSC_POWER].R;
494 if (config & LM25066_DEV_SETUP_CL) {
495 info->m[PSC_CURRENT_IN] = coeff[PSC_CURRENT_IN_L].m;
496 info->m[PSC_POWER] = coeff[PSC_POWER_L].m;
497 } else {
498 info->m[PSC_CURRENT_IN] = coeff[PSC_CURRENT_IN].m;
499 info->m[PSC_POWER] = coeff[PSC_POWER].m;
500 }
501
502 return pmbus_do_probe(client, id, info);
503}
504
505static const struct i2c_device_id lm25066_id[] = {
506 {"lm25056", lm25056},
507 {"lm25063", lm25063},
508 {"lm25066", lm25066},
509 {"lm5064", lm5064},
510 {"lm5066", lm5066},
511 { }
512};
513
514MODULE_DEVICE_TABLE(i2c, lm25066_id);
515
516
517static struct i2c_driver lm25066_driver = {
518 .driver = {
519 .name = "lm25066",
520 },
521 .probe = lm25066_probe,
522 .remove = pmbus_do_remove,
523 .id_table = lm25066_id,
524};
525
526module_i2c_driver(lm25066_driver);
527
528MODULE_AUTHOR("Guenter Roeck");
529MODULE_DESCRIPTION("PMBus driver for LM25066 and compatible chips");
530MODULE_LICENSE("GPL");
531
