?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
WIP FPC-III support
[linux/fpc-iii.git] / drivers / hwmon / pmbus / max20730.c
blob9dd3dd79bc182d3e71c2188578101d3ff279c8f3
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Driver for MAX20710, MAX20730, MAX20734, and MAX20743 Integrated,
4 * Step-Down Switching Regulators
5 *
6 * Copyright 2019 Google LLC.
7 * Copyright 2020 Maxim Integrated
8 */
9
10 #include <linux/bits.h>
11 #include <linux/debugfs.h>
12 #include <linux/err.h>
13 #include <linux/i2c.h>
14 #include <linux/init.h>
15 #include <linux/kernel.h>
16 #include <linux/module.h>
17 #include <linux/mutex.h>
18 #include <linux/of_device.h>
19 #include <linux/pmbus.h>
20 #include <linux/util_macros.h>
21 #include "pmbus.h"
22
23 enum chips {
24 max20710,
25 max20730,
26 max20734,
27 max20743
28 };
29
30 enum {
31 MAX20730_DEBUGFS_VOUT_MIN = 0,
32 MAX20730_DEBUGFS_FREQUENCY,
33 MAX20730_DEBUGFS_PG_DELAY,
34 MAX20730_DEBUGFS_INTERNAL_GAIN,
35 MAX20730_DEBUGFS_BOOT_VOLTAGE,
36 MAX20730_DEBUGFS_OUT_V_RAMP_RATE,
37 MAX20730_DEBUGFS_OC_PROTECT_MODE,
38 MAX20730_DEBUGFS_SS_TIMING,
39 MAX20730_DEBUGFS_IMAX,
40 MAX20730_DEBUGFS_OPERATION,
41 MAX20730_DEBUGFS_ON_OFF_CONFIG,
42 MAX20730_DEBUGFS_SMBALERT_MASK,
43 MAX20730_DEBUGFS_VOUT_MODE,
44 MAX20730_DEBUGFS_VOUT_COMMAND,
45 MAX20730_DEBUGFS_VOUT_MAX,
46 MAX20730_DEBUGFS_NUM_ENTRIES
47 };
48
49 struct max20730_data {
50 enum chips id;
51 struct pmbus_driver_info info;
52 struct mutex lock; /* Used to protect against parallel writes */
53 u16 mfr_devset1;
54 u16 mfr_devset2;
55 u16 mfr_voutmin;
56 u32 vout_voltage_divider[2];
57 };
58
59 #define to_max20730_data(x) container_of(x, struct max20730_data, info)
60
61 #define VOLT_FROM_REG(val) DIV_ROUND_CLOSEST((val), 1 << 9)
62
63 #define PMBUS_SMB_ALERT_MASK 0x1B
64
65 #define MAX20730_MFR_VOUT_MIN 0xd1
66 #define MAX20730_MFR_DEVSET1 0xd2
67 #define MAX20730_MFR_DEVSET2 0xd3
68
69 #define MAX20730_MFR_VOUT_MIN_MASK GENMASK(9, 0)
70 #define MAX20730_MFR_VOUT_MIN_BIT_POS 0
71
72 #define MAX20730_MFR_DEVSET1_RGAIN_MASK (BIT(13) | BIT(14))
73 #define MAX20730_MFR_DEVSET1_OTP_MASK (BIT(11) | BIT(12))
74 #define MAX20730_MFR_DEVSET1_VBOOT_MASK (BIT(8) | BIT(9))
75 #define MAX20730_MFR_DEVSET1_OCP_MASK (BIT(5) | BIT(6))
76 #define MAX20730_MFR_DEVSET1_FSW_MASK GENMASK(4, 2)
77 #define MAX20730_MFR_DEVSET1_TSTAT_MASK (BIT(0) | BIT(1))
78
79 #define MAX20730_MFR_DEVSET1_RGAIN_BIT_POS 13
80 #define MAX20730_MFR_DEVSET1_OTP_BIT_POS 11
81 #define MAX20730_MFR_DEVSET1_VBOOT_BIT_POS 8
82 #define MAX20730_MFR_DEVSET1_OCP_BIT_POS 5
83 #define MAX20730_MFR_DEVSET1_FSW_BIT_POS 2
84 #define MAX20730_MFR_DEVSET1_TSTAT_BIT_POS 0
85
86 #define MAX20730_MFR_DEVSET2_IMAX_MASK GENMASK(10, 8)
87 #define MAX20730_MFR_DEVSET2_VRATE (BIT(6) | BIT(7))
88 #define MAX20730_MFR_DEVSET2_OCPM_MASK BIT(5)
89 #define MAX20730_MFR_DEVSET2_SS_MASK (BIT(0) | BIT(1))
90
91 #define MAX20730_MFR_DEVSET2_IMAX_BIT_POS 8
92 #define MAX20730_MFR_DEVSET2_VRATE_BIT_POS 6
93 #define MAX20730_MFR_DEVSET2_OCPM_BIT_POS 5
94 #define MAX20730_MFR_DEVSET2_SS_BIT_POS 0
95
96 #define DEBUG_FS_DATA_MAX 16
97
98 struct max20730_debugfs_data {
99 struct i2c_client *client;
100 int debugfs_entries[MAX20730_DEBUGFS_NUM_ENTRIES];
101 };
102
103 #define to_psu(x, y) container_of((x), \
104 struct max20730_debugfs_data, debugfs_entries[(y)])
105
106 #ifdef CONFIG_DEBUG_FS
107 static ssize_t max20730_debugfs_read(struct file *file, char __user *buf,
108 size_t count, loff_t *ppos)
109 {
110 int ret, len;
111 int *idxp = file->private_data;
112 int idx = *idxp;
113 struct max20730_debugfs_data *psu = to_psu(idxp, idx);
114 const struct pmbus_driver_info *info;
115 const struct max20730_data *data;
116 char tbuf[DEBUG_FS_DATA_MAX] = { 0 };
117 u16 val;
118
119 info = pmbus_get_driver_info(psu->client);
120 data = to_max20730_data(info);
121
122 switch (idx) {
123 case MAX20730_DEBUGFS_VOUT_MIN:
124 ret = VOLT_FROM_REG(data->mfr_voutmin * 10000);
125 len = scnprintf(tbuf, DEBUG_FS_DATA_MAX, "%d.%d\n",
126 ret / 10000, ret % 10000);
127 break;
128 case MAX20730_DEBUGFS_FREQUENCY:
129 val = (data->mfr_devset1 & MAX20730_MFR_DEVSET1_FSW_MASK)
130 >> MAX20730_MFR_DEVSET1_FSW_BIT_POS;
131
132 if (val == 0)
133 ret = 400;
134 else if (val == 1)
135 ret = 500;
136 else if (val == 2 || val == 3)
137 ret = 600;
138 else if (val == 4)
139 ret = 700;
140 else if (val == 5)
141 ret = 800;
142 else
143 ret = 900;
144 len = scnprintf(tbuf, DEBUG_FS_DATA_MAX, "%d\n", ret);
145 break;
146 case MAX20730_DEBUGFS_PG_DELAY:
147 val = (data->mfr_devset1 & MAX20730_MFR_DEVSET1_TSTAT_MASK)
148 >> MAX20730_MFR_DEVSET1_TSTAT_BIT_POS;
149
150 if (val == 0)
151 len = strlcpy(tbuf, "2000\n", DEBUG_FS_DATA_MAX);
152 else if (val == 1)
153 len = strlcpy(tbuf, "125\n", DEBUG_FS_DATA_MAX);
154 else if (val == 2)
155 len = strlcpy(tbuf, "62.5\n", DEBUG_FS_DATA_MAX);
156 else
157 len = strlcpy(tbuf, "32\n", DEBUG_FS_DATA_MAX);
158 break;
159 case MAX20730_DEBUGFS_INTERNAL_GAIN:
160 val = (data->mfr_devset1 & MAX20730_MFR_DEVSET1_RGAIN_MASK)
161 >> MAX20730_MFR_DEVSET1_RGAIN_BIT_POS;
162
163 if (data->id == max20734) {
164 /* AN6209 */
165 if (val == 0)
166 len = strlcpy(tbuf, "0.8\n", DEBUG_FS_DATA_MAX);
167 else if (val == 1)
168 len = strlcpy(tbuf, "3.2\n", DEBUG_FS_DATA_MAX);
169 else if (val == 2)
170 len = strlcpy(tbuf, "1.6\n", DEBUG_FS_DATA_MAX);
171 else
172 len = strlcpy(tbuf, "6.4\n", DEBUG_FS_DATA_MAX);
173 } else if (data->id == max20730 || data->id == max20710) {
174 /* AN6042 or AN6140 */
175 if (val == 0)
176 len = strlcpy(tbuf, "0.9\n", DEBUG_FS_DATA_MAX);
177 else if (val == 1)
178 len = strlcpy(tbuf, "3.6\n", DEBUG_FS_DATA_MAX);
179 else if (val == 2)
180 len = strlcpy(tbuf, "1.8\n", DEBUG_FS_DATA_MAX);
181 else
182 len = strlcpy(tbuf, "7.2\n", DEBUG_FS_DATA_MAX);
183 } else if (data->id == max20743) {
184 /* AN6042 */
185 if (val == 0)
186 len = strlcpy(tbuf, "0.45\n", DEBUG_FS_DATA_MAX);
187 else if (val == 1)
188 len = strlcpy(tbuf, "1.8\n", DEBUG_FS_DATA_MAX);
189 else if (val == 2)
190 len = strlcpy(tbuf, "0.9\n", DEBUG_FS_DATA_MAX);
191 else
192 len = strlcpy(tbuf, "3.6\n", DEBUG_FS_DATA_MAX);
193 } else {
194 len = strlcpy(tbuf, "Not supported\n", DEBUG_FS_DATA_MAX);
195 }
196 break;
197 case MAX20730_DEBUGFS_BOOT_VOLTAGE:
198 val = (data->mfr_devset1 & MAX20730_MFR_DEVSET1_VBOOT_MASK)
199 >> MAX20730_MFR_DEVSET1_VBOOT_BIT_POS;
200
201 if (val == 0)
202 len = strlcpy(tbuf, "0.6484\n", DEBUG_FS_DATA_MAX);
203 else if (val == 1)
204 len = strlcpy(tbuf, "0.8984\n", DEBUG_FS_DATA_MAX);
205 else if (val == 2)
206 len = strlcpy(tbuf, "1.0\n", DEBUG_FS_DATA_MAX);
207 else
208 len = strlcpy(tbuf, "Invalid\n", DEBUG_FS_DATA_MAX);
209 break;
210 case MAX20730_DEBUGFS_OUT_V_RAMP_RATE:
211 val = (data->mfr_devset2 & MAX20730_MFR_DEVSET2_VRATE)
212 >> MAX20730_MFR_DEVSET2_VRATE_BIT_POS;
213
214 if (val == 0)
215 len = strlcpy(tbuf, "4\n", DEBUG_FS_DATA_MAX);
216 else if (val == 1)
217 len = strlcpy(tbuf, "2\n", DEBUG_FS_DATA_MAX);
218 else if (val == 2)
219 len = strlcpy(tbuf, "1\n", DEBUG_FS_DATA_MAX);
220 else
221 len = strlcpy(tbuf, "Invalid\n", DEBUG_FS_DATA_MAX);
222 break;
223 case MAX20730_DEBUGFS_OC_PROTECT_MODE:
224 ret = (data->mfr_devset2 & MAX20730_MFR_DEVSET2_OCPM_MASK)
225 >> MAX20730_MFR_DEVSET2_OCPM_BIT_POS;
226 len = scnprintf(tbuf, DEBUG_FS_DATA_MAX, "%d\n", ret);
227 break;
228 case MAX20730_DEBUGFS_SS_TIMING:
229 val = (data->mfr_devset2 & MAX20730_MFR_DEVSET2_SS_MASK)
230 >> MAX20730_MFR_DEVSET2_SS_BIT_POS;
231
232 if (val == 0)
233 len = strlcpy(tbuf, "0.75\n", DEBUG_FS_DATA_MAX);
234 else if (val == 1)
235 len = strlcpy(tbuf, "1.5\n", DEBUG_FS_DATA_MAX);
236 else if (val == 2)
237 len = strlcpy(tbuf, "3\n", DEBUG_FS_DATA_MAX);
238 else
239 len = strlcpy(tbuf, "6\n", DEBUG_FS_DATA_MAX);
240 break;
241 case MAX20730_DEBUGFS_IMAX:
242 ret = (data->mfr_devset2 & MAX20730_MFR_DEVSET2_IMAX_MASK)
243 >> MAX20730_MFR_DEVSET2_IMAX_BIT_POS;
244 len = scnprintf(tbuf, DEBUG_FS_DATA_MAX, "%d\n", ret);
245 break;
246 case MAX20730_DEBUGFS_OPERATION:
247 ret = i2c_smbus_read_byte_data(psu->client, PMBUS_OPERATION);
248 if (ret < 0)
249 return ret;
250 len = scnprintf(tbuf, DEBUG_FS_DATA_MAX, "%d\n", ret);
251 break;
252 case MAX20730_DEBUGFS_ON_OFF_CONFIG:
253 ret = i2c_smbus_read_byte_data(psu->client, PMBUS_ON_OFF_CONFIG);
254 if (ret < 0)
255 return ret;
256 len = scnprintf(tbuf, DEBUG_FS_DATA_MAX, "%d\n", ret);
257 break;
258 case MAX20730_DEBUGFS_SMBALERT_MASK:
259 ret = i2c_smbus_read_word_data(psu->client,
260 PMBUS_SMB_ALERT_MASK);
261 if (ret < 0)
262 return ret;
263 len = scnprintf(tbuf, DEBUG_FS_DATA_MAX, "%d\n", ret);
264 break;
265 case MAX20730_DEBUGFS_VOUT_MODE:
266 ret = i2c_smbus_read_byte_data(psu->client, PMBUS_VOUT_MODE);
267 if (ret < 0)
268 return ret;
269 len = scnprintf(tbuf, DEBUG_FS_DATA_MAX, "%d\n", ret);
270 break;
271 case MAX20730_DEBUGFS_VOUT_COMMAND:
272 ret = i2c_smbus_read_word_data(psu->client, PMBUS_VOUT_COMMAND);
273 if (ret < 0)
274 return ret;
275
276 ret = VOLT_FROM_REG(ret * 10000);
277 len = scnprintf(tbuf, DEBUG_FS_DATA_MAX,
278 "%d.%d\n", ret / 10000, ret % 10000);
279 break;
280 case MAX20730_DEBUGFS_VOUT_MAX:
281 ret = i2c_smbus_read_word_data(psu->client, PMBUS_VOUT_MAX);
282 if (ret < 0)
283 return ret;
284
285 ret = VOLT_FROM_REG(ret * 10000);
286 len = scnprintf(tbuf, DEBUG_FS_DATA_MAX,
287 "%d.%d\n", ret / 10000, ret % 10000);
288 break;
289 default:
290 len = strlcpy(tbuf, "Invalid\n", DEBUG_FS_DATA_MAX);
291 }
292
293 return simple_read_from_buffer(buf, count, ppos, tbuf, len);
294 }
295
296 static const struct file_operations max20730_fops = {
297 .llseek = noop_llseek,
298 .read = max20730_debugfs_read,
299 .write = NULL,
300 .open = simple_open,
301 };
302
303 static int max20730_init_debugfs(struct i2c_client *client,
304 struct max20730_data *data)
305 {
306 int ret, i;
307 struct dentry *debugfs;
308 struct dentry *max20730_dir;
309 struct max20730_debugfs_data *psu;
310
311 ret = i2c_smbus_read_word_data(client, MAX20730_MFR_DEVSET2);
312 if (ret < 0)
313 return ret;
314 data->mfr_devset2 = ret;
315
316 ret = i2c_smbus_read_word_data(client, MAX20730_MFR_VOUT_MIN);
317 if (ret < 0)
318 return ret;
319 data->mfr_voutmin = ret;
320
321 psu = devm_kzalloc(&client->dev, sizeof(*psu), GFP_KERNEL);
322 if (!psu)
323 return -ENOMEM;
324 psu->client = client;
325
326 debugfs = pmbus_get_debugfs_dir(client);
327 if (!debugfs)
328 return -ENOENT;
329
330 max20730_dir = debugfs_create_dir(client->name, debugfs);
331
332 for (i = 0; i < MAX20730_DEBUGFS_NUM_ENTRIES; ++i)
333 psu->debugfs_entries[i] = i;
334
335 debugfs_create_file("vout_min", 0444, max20730_dir,
336 &psu->debugfs_entries[MAX20730_DEBUGFS_VOUT_MIN],
337 &max20730_fops);
338 debugfs_create_file("frequency", 0444, max20730_dir,
339 &psu->debugfs_entries[MAX20730_DEBUGFS_FREQUENCY],
340 &max20730_fops);
341 debugfs_create_file("power_good_delay", 0444, max20730_dir,
342 &psu->debugfs_entries[MAX20730_DEBUGFS_PG_DELAY],
343 &max20730_fops);
344 debugfs_create_file("internal_gain", 0444, max20730_dir,
345 &psu->debugfs_entries[MAX20730_DEBUGFS_INTERNAL_GAIN],
346 &max20730_fops);
347 debugfs_create_file("boot_voltage", 0444, max20730_dir,
348 &psu->debugfs_entries[MAX20730_DEBUGFS_BOOT_VOLTAGE],
349 &max20730_fops);
350 debugfs_create_file("out_voltage_ramp_rate", 0444, max20730_dir,
351 &psu->debugfs_entries[MAX20730_DEBUGFS_OUT_V_RAMP_RATE],
352 &max20730_fops);
353 debugfs_create_file("oc_protection_mode", 0444, max20730_dir,
354 &psu->debugfs_entries[MAX20730_DEBUGFS_OC_PROTECT_MODE],
355 &max20730_fops);
356 debugfs_create_file("soft_start_timing", 0444, max20730_dir,
357 &psu->debugfs_entries[MAX20730_DEBUGFS_SS_TIMING],
358 &max20730_fops);
359 debugfs_create_file("imax", 0444, max20730_dir,
360 &psu->debugfs_entries[MAX20730_DEBUGFS_IMAX],
361 &max20730_fops);
362 debugfs_create_file("operation", 0444, max20730_dir,
363 &psu->debugfs_entries[MAX20730_DEBUGFS_OPERATION],
364 &max20730_fops);
365 debugfs_create_file("on_off_config", 0444, max20730_dir,
366 &psu->debugfs_entries[MAX20730_DEBUGFS_ON_OFF_CONFIG],
367 &max20730_fops);
368 debugfs_create_file("smbalert_mask", 0444, max20730_dir,
369 &psu->debugfs_entries[MAX20730_DEBUGFS_SMBALERT_MASK],
370 &max20730_fops);
371 debugfs_create_file("vout_mode", 0444, max20730_dir,
372 &psu->debugfs_entries[MAX20730_DEBUGFS_VOUT_MODE],
373 &max20730_fops);
374 debugfs_create_file("vout_command", 0444, max20730_dir,
375 &psu->debugfs_entries[MAX20730_DEBUGFS_VOUT_COMMAND],
376 &max20730_fops);
377 debugfs_create_file("vout_max", 0444, max20730_dir,
378 &psu->debugfs_entries[MAX20730_DEBUGFS_VOUT_MAX],
379 &max20730_fops);
380
381 return 0;
382 }
383 #else
384 static int max20730_init_debugfs(struct i2c_client *client,
385 struct max20730_data *data)
386 {
387 return 0;
388 }
389 #endif /* CONFIG_DEBUG_FS */
390
391 static const struct i2c_device_id max20730_id[];
392
393 /*
394 * Convert discreet value to direct data format. Strictly speaking, all passed
395 * values are constants, so we could do that calculation manually. On the
396 * downside, that would make the driver more difficult to maintain, so lets
397 * use this approach.
398 */
399 static u16 val_to_direct(int v, enum pmbus_sensor_classes class,
400 const struct pmbus_driver_info *info)
401 {
402 int R = info->R[class] - 3; /* take milli-units into account */
403 int b = info->b[class] * 1000;
404 long d;
405
406 d = v * info->m[class] + b;
407 /*
408 * R < 0 is true for all callers, so we don't need to bother
409 * about the R > 0 case.
410 */
411 while (R < 0) {
412 d = DIV_ROUND_CLOSEST(d, 10);
413 R++;
414 }
415 return (u16)d;
416 }
417
418 static long direct_to_val(u16 w, enum pmbus_sensor_classes class,
419 const struct pmbus_driver_info *info)
420 {
421 int R = info->R[class] - 3;
422 int b = info->b[class] * 1000;
423 int m = info->m[class];
424 long d = (s16)w;
425
426 if (m == 0)
427 return 0;
428
429 while (R < 0) {
430 d *= 10;
431 R++;
432 }
433 d = (d - b) / m;
434 return d;
435 }
436
437 static u32 max_current[][5] = {
438 [max20710] = { 6200, 8000, 9700, 11600 },
439 [max20730] = { 13000, 16600, 20100, 23600 },
440 [max20734] = { 21000, 27000, 32000, 38000 },
441 [max20743] = { 18900, 24100, 29200, 34100 },
442 };
443
444 static int max20730_read_word_data(struct i2c_client *client, int page,
445 int phase, int reg)
446 {
447 const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
448 const struct max20730_data *data = to_max20730_data(info);
449 int ret = 0;
450 u32 max_c;
451
452 switch (reg) {
453 case PMBUS_OT_FAULT_LIMIT:
454 switch ((data->mfr_devset1 >> 11) & 0x3) {
455 case 0x0:
456 ret = val_to_direct(150000, PSC_TEMPERATURE, info);
457 break;
458 case 0x1:
459 ret = val_to_direct(130000, PSC_TEMPERATURE, info);
460 break;
461 default:
462 ret = -ENODATA;
463 break;
464 }
465 break;
466 case PMBUS_IOUT_OC_FAULT_LIMIT:
467 max_c = max_current[data->id][(data->mfr_devset1 >> 5) & 0x3];
468 ret = val_to_direct(max_c, PSC_CURRENT_OUT, info);
469 break;
470 case PMBUS_READ_VOUT:
471 ret = pmbus_read_word_data(client, page, phase, reg);
472 if (ret > 0 && data->vout_voltage_divider[0] && data->vout_voltage_divider[1]) {
473 u64 temp = DIV_ROUND_CLOSEST_ULL((u64)ret * data->vout_voltage_divider[1],
474 data->vout_voltage_divider[0]);
475 ret = clamp_val(temp, 0, 0xffff);
476 }
477 break;
478 default:
479 ret = -ENODATA;
480 break;
481 }
482 return ret;
483 }
484
485 static int max20730_write_word_data(struct i2c_client *client, int page,
486 int reg, u16 word)
487 {
488 struct pmbus_driver_info *info;
489 struct max20730_data *data;
490 u16 devset1;
491 int ret = 0;
492 int idx;
493
494 info = (struct pmbus_driver_info *)pmbus_get_driver_info(client);
495 data = to_max20730_data(info);
496
497 mutex_lock(&data->lock);
498 devset1 = data->mfr_devset1;
499
500 switch (reg) {
501 case PMBUS_OT_FAULT_LIMIT:
502 devset1 &= ~(BIT(11) | BIT(12));
503 if (direct_to_val(word, PSC_TEMPERATURE, info) < 140000)
504 devset1 |= BIT(11);
505 break;
506 case PMBUS_IOUT_OC_FAULT_LIMIT:
507 devset1 &= ~(BIT(5) | BIT(6));
508
509 idx = find_closest(direct_to_val(word, PSC_CURRENT_OUT, info),
510 max_current[data->id], 4);
511 devset1 |= (idx << 5);
512 break;
513 default:
514 ret = -ENODATA;
515 break;
516 }
517
518 if (!ret && devset1 != data->mfr_devset1) {
519 ret = i2c_smbus_write_word_data(client, MAX20730_MFR_DEVSET1,
520 devset1);
521 if (!ret) {
522 data->mfr_devset1 = devset1;
523 pmbus_clear_cache(client);
524 }
525 }
526 mutex_unlock(&data->lock);
527 return ret;
528 }
529
530 static const struct pmbus_driver_info max20730_info[] = {
531 [max20710] = {
532 .pages = 1,
533 .read_word_data = max20730_read_word_data,
534 .write_word_data = max20730_write_word_data,
535
536 /* Source : Maxim AN6140 and AN6042 */
537 .format[PSC_TEMPERATURE] = direct,
538 .m[PSC_TEMPERATURE] = 21,
539 .b[PSC_TEMPERATURE] = 5887,
540 .R[PSC_TEMPERATURE] = -1,
541
542 .format[PSC_VOLTAGE_IN] = direct,
543 .m[PSC_VOLTAGE_IN] = 3609,
544 .b[PSC_VOLTAGE_IN] = 0,
545 .R[PSC_VOLTAGE_IN] = -2,
546
547 .format[PSC_CURRENT_OUT] = direct,
548 .m[PSC_CURRENT_OUT] = 153,
549 .b[PSC_CURRENT_OUT] = 4976,
550 .R[PSC_CURRENT_OUT] = -1,
551
552 .format[PSC_VOLTAGE_OUT] = linear,
553
554 .func[0] = PMBUS_HAVE_VIN |
555 PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
556 PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
557 PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP |
558 PMBUS_HAVE_STATUS_INPUT,
559 },
560 [max20730] = {
561 .pages = 1,
562 .read_word_data = max20730_read_word_data,
563 .write_word_data = max20730_write_word_data,
564
565 /* Source : Maxim AN6042 */
566 .format[PSC_TEMPERATURE] = direct,
567 .m[PSC_TEMPERATURE] = 21,
568 .b[PSC_TEMPERATURE] = 5887,
569 .R[PSC_TEMPERATURE] = -1,
570
571 .format[PSC_VOLTAGE_IN] = direct,
572 .m[PSC_VOLTAGE_IN] = 3609,
573 .b[PSC_VOLTAGE_IN] = 0,
574 .R[PSC_VOLTAGE_IN] = -2,
575
576 /*
577 * Values in the datasheet are adjusted for temperature and
578 * for the relationship between Vin and Vout.
579 * Unfortunately, the data sheet suggests that Vout measurement
580 * may be scaled with a resistor array. This is indeed the case
581 * at least on the evaulation boards. As a result, any in-driver
582 * adjustments would either be wrong or require elaborate means
583 * to configure the scaling. Instead of doing that, just report
584 * raw values and let userspace handle adjustments.
585 */
586 .format[PSC_CURRENT_OUT] = direct,
587 .m[PSC_CURRENT_OUT] = 153,
588 .b[PSC_CURRENT_OUT] = 4976,
589 .R[PSC_CURRENT_OUT] = -1,
590
591 .format[PSC_VOLTAGE_OUT] = linear,
592
593 .func[0] = PMBUS_HAVE_VIN |
594 PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
595 PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
596 PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP |
597 PMBUS_HAVE_STATUS_INPUT,
598 },
599 [max20734] = {
600 .pages = 1,
601 .read_word_data = max20730_read_word_data,
602 .write_word_data = max20730_write_word_data,
603
604 /* Source : Maxim AN6209 */
605 .format[PSC_TEMPERATURE] = direct,
606 .m[PSC_TEMPERATURE] = 21,
607 .b[PSC_TEMPERATURE] = 5887,
608 .R[PSC_TEMPERATURE] = -1,
609
610 .format[PSC_VOLTAGE_IN] = direct,
611 .m[PSC_VOLTAGE_IN] = 3592,
612 .b[PSC_VOLTAGE_IN] = 0,
613 .R[PSC_VOLTAGE_IN] = -2,
614
615 .format[PSC_CURRENT_OUT] = direct,
616 .m[PSC_CURRENT_OUT] = 111,
617 .b[PSC_CURRENT_OUT] = 3461,
618 .R[PSC_CURRENT_OUT] = -1,
619
620 .format[PSC_VOLTAGE_OUT] = linear,
621
622 .func[0] = PMBUS_HAVE_VIN |
623 PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
624 PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
625 PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP |
626 PMBUS_HAVE_STATUS_INPUT,
627 },
628 [max20743] = {
629 .pages = 1,
630 .read_word_data = max20730_read_word_data,
631 .write_word_data = max20730_write_word_data,
632
633 /* Source : Maxim AN6042 */
634 .format[PSC_TEMPERATURE] = direct,
635 .m[PSC_TEMPERATURE] = 21,
636 .b[PSC_TEMPERATURE] = 5887,
637 .R[PSC_TEMPERATURE] = -1,
638
639 .format[PSC_VOLTAGE_IN] = direct,
640 .m[PSC_VOLTAGE_IN] = 3597,
641 .b[PSC_VOLTAGE_IN] = 0,
642 .R[PSC_VOLTAGE_IN] = -2,
643
644 .format[PSC_CURRENT_OUT] = direct,
645 .m[PSC_CURRENT_OUT] = 95,
646 .b[PSC_CURRENT_OUT] = 5014,
647 .R[PSC_CURRENT_OUT] = -1,
648
649 .format[PSC_VOLTAGE_OUT] = linear,
650
651 .func[0] = PMBUS_HAVE_VIN |
652 PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
653 PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
654 PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP |
655 PMBUS_HAVE_STATUS_INPUT,
656 },
657 };
658
659 static int max20730_probe(struct i2c_client *client)
660 {
661 struct device *dev = &client->dev;
662 u8 buf[I2C_SMBUS_BLOCK_MAX + 1];
663 struct max20730_data *data;
664 enum chips chip_id;
665 int ret;
666
667 if (!i2c_check_functionality(client->adapter,
668 I2C_FUNC_SMBUS_READ_BYTE_DATA |
669 I2C_FUNC_SMBUS_READ_WORD_DATA |
670 I2C_FUNC_SMBUS_BLOCK_DATA))
671 return -ENODEV;
672
673 ret = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, buf);
674 if (ret < 0) {
675 dev_err(&client->dev, "Failed to read Manufacturer ID\n");
676 return ret;
677 }
678 if (ret != 5 || strncmp(buf, "MAXIM", 5)) {
679 buf[ret] = '\0';
680 dev_err(dev, "Unsupported Manufacturer ID '%s'\n", buf);
681 return -ENODEV;
682 }
683
684 /*
685 * The chips support reading PMBUS_MFR_MODEL. On both MAX20730
686 * and MAX20734, reading it returns M20743. Presumably that is
687 * the reason why the command is not documented. Unfortunately,
688 * that means that there is no reliable means to detect the chip.
689 * However, we can at least detect the chip series. Compare
690 * the returned value against 'M20743' and bail out if there is
691 * a mismatch. If that doesn't work for all chips, we may have
692 * to remove this check.
693 */
694 ret = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, buf);
695 if (ret < 0) {
696 dev_err(dev, "Failed to read Manufacturer Model\n");
697 return ret;
698 }
699 if (ret != 6 || strncmp(buf, "M20743", 6)) {
700 buf[ret] = '\0';
701 dev_err(dev, "Unsupported Manufacturer Model '%s'\n", buf);
702 return -ENODEV;
703 }
704
705 ret = i2c_smbus_read_block_data(client, PMBUS_MFR_REVISION, buf);
706 if (ret < 0) {
707 dev_err(dev, "Failed to read Manufacturer Revision\n");
708 return ret;
709 }
710 if (ret != 1 || buf[0] != 'F') {
711 buf[ret] = '\0';
712 dev_err(dev, "Unsupported Manufacturer Revision '%s'\n", buf);
713 return -ENODEV;
714 }
715
716 if (client->dev.of_node)
717 chip_id = (enum chips)of_device_get_match_data(dev);
718 else
719 chip_id = i2c_match_id(max20730_id, client)->driver_data;
720
721 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
722 if (!data)
723 return -ENOMEM;
724 data->id = chip_id;
725 mutex_init(&data->lock);
726 memcpy(&data->info, &max20730_info[chip_id], sizeof(data->info));
727 if (of_property_read_u32_array(client->dev.of_node, "vout-voltage-divider",
728 data->vout_voltage_divider,
729 ARRAY_SIZE(data->vout_voltage_divider)) != 0)
730 memset(data->vout_voltage_divider, 0, sizeof(data->vout_voltage_divider));
731 if (data->vout_voltage_divider[1] < data->vout_voltage_divider[0]) {
732 dev_err(dev,
733 "The total resistance of voltage divider is less than output resistance\n");
734 return -EINVAL;
735 }
736
737 ret = i2c_smbus_read_word_data(client, MAX20730_MFR_DEVSET1);
738 if (ret < 0)
739 return ret;
740 data->mfr_devset1 = ret;
741
742 ret = pmbus_do_probe(client, &data->info);
743 if (ret < 0)
744 return ret;
745
746 ret = max20730_init_debugfs(client, data);
747 if (ret)
748 dev_warn(dev, "Failed to register debugfs: %d\n",
749 ret);
750
751 return 0;
752 }
753
754 static const struct i2c_device_id max20730_id[] = {
755 { "max20710", max20710 },
756 { "max20730", max20730 },
757 { "max20734", max20734 },
758 { "max20743", max20743 },
759 { },
760 };
761
762 MODULE_DEVICE_TABLE(i2c, max20730_id);
763
764 static const struct of_device_id max20730_of_match[] = {
765 { .compatible = "maxim,max20710", .data = (void *)max20710 },
766 { .compatible = "maxim,max20730", .data = (void *)max20730 },
767 { .compatible = "maxim,max20734", .data = (void *)max20734 },
768 { .compatible = "maxim,max20743", .data = (void *)max20743 },
769 { },
770 };
771
772 MODULE_DEVICE_TABLE(of, max20730_of_match);
773
774 static struct i2c_driver max20730_driver = {
775 .driver = {
776 .name = "max20730",
777 .of_match_table = max20730_of_match,
778 },
779 .probe_new = max20730_probe,
780 .id_table = max20730_id,
781 };
782
783 module_i2c_driver(max20730_driver);
784
785 MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");
786 MODULE_DESCRIPTION("PMBus driver for Maxim MAX20710 / MAX20730 / MAX20734 / MAX20743");
787 MODULE_LICENSE("GPL");
Linux with added FPC-III support