1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Fuel gauge driver for Maxim 17201/17205
4 *
5 * based on max1721x_battery.c
6 *
7 * Copyright (C) 2024 Liebherr-Electronics and Drives GmbH
8 */
9
10#include <linux/bitfield.h>
11#include <linux/i2c.h>
12#include <linux/module.h>
13#include <linux/nvmem-provider.h>
14#include <linux/power_supply.h>
15#include <linux/regmap.h>
16
17#include <linux/unaligned.h>
18
19/* SBS compliant registers */
20#define MAX172XX_TEMP1 0x34
21#define MAX172XX_INT_TEMP 0x35
22#define MAX172XX_TEMP2 0x3B
23
24/* Nonvolatile registers */
25#define MAX1720X_NXTABLE0 0x80
26#define MAX1720X_NRSENSE 0xCF /* RSense in 10^-5 Ohm */
27#define MAX1720X_NDEVICE_NAME4 0xDF
28
29/* ModelGauge m5 */
30#define MAX172XX_STATUS 0x00 /* Status */
31#define MAX172XX_STATUS_BAT_ABSENT BIT(3) /* Battery absent */
32#define MAX172XX_STATUS_IMX BIT(6) /* Maximum Current Alert Threshold Exceeded */
33#define MAX172XX_STATUS_VMN BIT(8) /* Minimum Voltage Alert Threshold Exceeded */
34#define MAX172XX_STATUS_TMN BIT(9) /* Minimum Temperature Alert Threshold Exceeded */
35#define MAX172XX_STATUS_VMX BIT(12) /* Maximum Voltage Alert Threshold Exceeded */
36#define MAX172XX_STATUS_TMX BIT(13) /* Maximum Temperature Alert Threshold Exceeded */
37#define MAX172XX_REPCAP 0x05 /* Average capacity */
38#define MAX172XX_REPSOC 0x06 /* Percentage of charge */
39#define MAX172XX_TEMP 0x08 /* Temperature */
40#define MAX172XX_CURRENT 0x0A /* Actual current */
41#define MAX172XX_AVG_CURRENT 0x0B /* Average current */
42#define MAX172XX_FULL_CAP 0x10 /* Calculated full capacity */
43#define MAX172XX_TTE 0x11 /* Time to empty */
44#define MAX172XX_AVG_TA 0x16 /* Average temperature */
45#define MAX172XX_CYCLES 0x17
46#define MAX172XX_DESIGN_CAP 0x18 /* Design capacity */
47#define MAX172XX_AVG_VCELL 0x19
48#define MAX172XX_TTF 0x20 /* Time to full */
49#define MAX172XX_DEV_NAME 0x21 /* Device name */
50#define MAX172XX_DEV_NAME_TYPE_MASK GENMASK(3, 0)
51#define MAX172XX_DEV_NAME_TYPE_MAX17201 BIT(0)
52#define MAX172XX_DEV_NAME_TYPE_MAX17205 (BIT(0) | BIT(2))
53#define MAX172XX_QR_TABLE10 0x22
54#define MAX172XX_BATT 0xDA /* Battery voltage */
55#define MAX172XX_ATAVCAP 0xDF
56
57static const char *const max1720x_manufacturer = "Maxim Integrated";
58static const char *const max17201_model = "MAX17201";
59static const char *const max17205_model = "MAX17205";
60
61struct max1720x_device_info {
62 struct regmap *regmap;
63 struct regmap *regmap_nv;
64 struct i2c_client *ancillary;
65 int rsense;
66};
67
68/*
69 * Model Gauge M5 Algorithm output register
70 * Volatile data (must not be cached)
71 */
72static const struct regmap_range max1720x_volatile_allow[] = {
73 regmap_reg_range(MAX172XX_STATUS, MAX172XX_CYCLES),
74 regmap_reg_range(MAX172XX_AVG_VCELL, MAX172XX_TTF),
75 regmap_reg_range(MAX172XX_QR_TABLE10, MAX172XX_ATAVCAP),
76};
77
78static const struct regmap_range max1720x_readable_allow[] = {
79 regmap_reg_range(MAX172XX_STATUS, MAX172XX_ATAVCAP),
80};
81
82static const struct regmap_range max1720x_readable_deny[] = {
83 /* unused registers */
84 regmap_reg_range(0x24, 0x26),
85 regmap_reg_range(0x30, 0x31),
86 regmap_reg_range(0x33, 0x34),
87 regmap_reg_range(0x37, 0x37),
88 regmap_reg_range(0x3B, 0x3C),
89 regmap_reg_range(0x40, 0x41),
90 regmap_reg_range(0x43, 0x44),
91 regmap_reg_range(0x47, 0x49),
92 regmap_reg_range(0x4B, 0x4C),
93 regmap_reg_range(0x4E, 0xAF),
94 regmap_reg_range(0xB1, 0xB3),
95 regmap_reg_range(0xB5, 0xB7),
96 regmap_reg_range(0xBF, 0xD0),
97 regmap_reg_range(0xDB, 0xDB),
98 regmap_reg_range(0xE0, 0xFF),
99};
100
101static const struct regmap_access_table max1720x_readable_regs = {
102 .yes_ranges = max1720x_readable_allow,
103 .n_yes_ranges = ARRAY_SIZE(max1720x_readable_allow),
104 .no_ranges = max1720x_readable_deny,
105 .n_no_ranges = ARRAY_SIZE(max1720x_readable_deny),
106};
107
108static const struct regmap_access_table max1720x_volatile_regs = {
109 .yes_ranges = max1720x_volatile_allow,
110 .n_yes_ranges = ARRAY_SIZE(max1720x_volatile_allow),
111 .no_ranges = max1720x_readable_deny,
112 .n_no_ranges = ARRAY_SIZE(max1720x_readable_deny),
113};
114
115static const struct regmap_config max1720x_regmap_cfg = {
116 .reg_bits = 8,
117 .val_bits = 16,
118 .max_register = MAX172XX_ATAVCAP,
119 .val_format_endian = REGMAP_ENDIAN_LITTLE,
120 .rd_table = &max1720x_readable_regs,
121 .volatile_table = &max1720x_volatile_regs,
122 .cache_type = REGCACHE_MAPLE,
123};
124
125static const struct regmap_range max1720x_nvmem_allow[] = {
126 regmap_reg_range(MAX172XX_TEMP1, MAX172XX_INT_TEMP),
127 regmap_reg_range(MAX172XX_TEMP2, MAX172XX_TEMP2),
128 regmap_reg_range(MAX1720X_NXTABLE0, MAX1720X_NDEVICE_NAME4),
129};
130
131static const struct regmap_range max1720x_nvmem_deny[] = {
132 regmap_reg_range(0x00, 0x33),
133 regmap_reg_range(0x36, 0x3A),
134 regmap_reg_range(0x3C, 0x7F),
135 regmap_reg_range(0xE0, 0xFF),
136};
137
138static const struct regmap_access_table max1720x_nvmem_regs = {
139 .yes_ranges = max1720x_nvmem_allow,
140 .n_yes_ranges = ARRAY_SIZE(max1720x_nvmem_allow),
141 .no_ranges = max1720x_nvmem_deny,
142 .n_no_ranges = ARRAY_SIZE(max1720x_nvmem_deny),
143};
144
145static const struct regmap_config max1720x_nvmem_regmap_cfg = {
146 .reg_bits = 8,
147 .val_bits = 16,
148 .max_register = MAX1720X_NDEVICE_NAME4,
149 .val_format_endian = REGMAP_ENDIAN_LITTLE,
150 .rd_table = &max1720x_nvmem_regs,
151};
152
153static const struct nvmem_cell_info max1720x_nvmem_cells[] = {
154 { .name = "nXTable0", .offset = 0, .bytes = 2, },
155 { .name = "nXTable1", .offset = 2, .bytes = 2, },
156 { .name = "nXTable2", .offset = 4, .bytes = 2, },
157 { .name = "nXTable3", .offset = 6, .bytes = 2, },
158 { .name = "nXTable4", .offset = 8, .bytes = 2, },
159 { .name = "nXTable5", .offset = 10, .bytes = 2, },
160 { .name = "nXTable6", .offset = 12, .bytes = 2, },
161 { .name = "nXTable7", .offset = 14, .bytes = 2, },
162 { .name = "nXTable8", .offset = 16, .bytes = 2, },
163 { .name = "nXTable9", .offset = 18, .bytes = 2, },
164 { .name = "nXTable10", .offset = 20, .bytes = 2, },
165 { .name = "nXTable11", .offset = 22, .bytes = 2, },
166 { .name = "nUser18C", .offset = 24, .bytes = 2, },
167 { .name = "nUser18D", .offset = 26, .bytes = 2, },
168 { .name = "nODSCTh", .offset = 28, .bytes = 2, },
169 { .name = "nODSCCfg", .offset = 30, .bytes = 2, },
170
171 { .name = "nOCVTable0", .offset = 32, .bytes = 2, },
172 { .name = "nOCVTable1", .offset = 34, .bytes = 2, },
173 { .name = "nOCVTable2", .offset = 36, .bytes = 2, },
174 { .name = "nOCVTable3", .offset = 38, .bytes = 2, },
175 { .name = "nOCVTable4", .offset = 40, .bytes = 2, },
176 { .name = "nOCVTable5", .offset = 42, .bytes = 2, },
177 { .name = "nOCVTable6", .offset = 44, .bytes = 2, },
178 { .name = "nOCVTable7", .offset = 46, .bytes = 2, },
179 { .name = "nOCVTable8", .offset = 48, .bytes = 2, },
180 { .name = "nOCVTable9", .offset = 50, .bytes = 2, },
181 { .name = "nOCVTable10", .offset = 52, .bytes = 2, },
182 { .name = "nOCVTable11", .offset = 54, .bytes = 2, },
183 { .name = "nIChgTerm", .offset = 56, .bytes = 2, },
184 { .name = "nFilterCfg", .offset = 58, .bytes = 2, },
185 { .name = "nVEmpty", .offset = 60, .bytes = 2, },
186 { .name = "nLearnCfg", .offset = 62, .bytes = 2, },
187
188 { .name = "nQRTable00", .offset = 64, .bytes = 2, },
189 { .name = "nQRTable10", .offset = 66, .bytes = 2, },
190 { .name = "nQRTable20", .offset = 68, .bytes = 2, },
191 { .name = "nQRTable30", .offset = 70, .bytes = 2, },
192 { .name = "nCycles", .offset = 72, .bytes = 2, },
193 { .name = "nFullCapNom", .offset = 74, .bytes = 2, },
194 { .name = "nRComp0", .offset = 76, .bytes = 2, },
195 { .name = "nTempCo", .offset = 78, .bytes = 2, },
196 { .name = "nIAvgEmpty", .offset = 80, .bytes = 2, },
197 { .name = "nFullCapRep", .offset = 82, .bytes = 2, },
198 { .name = "nVoltTemp", .offset = 84, .bytes = 2, },
199 { .name = "nMaxMinCurr", .offset = 86, .bytes = 2, },
200 { .name = "nMaxMinVolt", .offset = 88, .bytes = 2, },
201 { .name = "nMaxMinTemp", .offset = 90, .bytes = 2, },
202 { .name = "nSOC", .offset = 92, .bytes = 2, },
203 { .name = "nTimerH", .offset = 94, .bytes = 2, },
204
205 { .name = "nConfig", .offset = 96, .bytes = 2, },
206 { .name = "nRippleCfg", .offset = 98, .bytes = 2, },
207 { .name = "nMiscCfg", .offset = 100, .bytes = 2, },
208 { .name = "nDesignCap", .offset = 102, .bytes = 2, },
209 { .name = "nHibCfg", .offset = 104, .bytes = 2, },
210 { .name = "nPackCfg", .offset = 106, .bytes = 2, },
211 { .name = "nRelaxCfg", .offset = 108, .bytes = 2, },
212 { .name = "nConvgCfg", .offset = 110, .bytes = 2, },
213 { .name = "nNVCfg0", .offset = 112, .bytes = 2, },
214 { .name = "nNVCfg1", .offset = 114, .bytes = 2, },
215 { .name = "nNVCfg2", .offset = 116, .bytes = 2, },
216 { .name = "nSBSCfg", .offset = 118, .bytes = 2, },
217 { .name = "nROMID0", .offset = 120, .bytes = 2, },
218 { .name = "nROMID1", .offset = 122, .bytes = 2, },
219 { .name = "nROMID2", .offset = 124, .bytes = 2, },
220 { .name = "nROMID3", .offset = 126, .bytes = 2, },
221
222 { .name = "nVAlrtTh", .offset = 128, .bytes = 2, },
223 { .name = "nTAlrtTh", .offset = 130, .bytes = 2, },
224 { .name = "nSAlrtTh", .offset = 132, .bytes = 2, },
225 { .name = "nIAlrtTh", .offset = 134, .bytes = 2, },
226 { .name = "nUser1C4", .offset = 136, .bytes = 2, },
227 { .name = "nUser1C5", .offset = 138, .bytes = 2, },
228 { .name = "nFullSOCThr", .offset = 140, .bytes = 2, },
229 { .name = "nTTFCfg", .offset = 142, .bytes = 2, },
230 { .name = "nCGain", .offset = 144, .bytes = 2, },
231 { .name = "nTCurve", .offset = 146, .bytes = 2, },
232 { .name = "nTGain", .offset = 148, .bytes = 2, },
233 { .name = "nTOff", .offset = 150, .bytes = 2, },
234 { .name = "nManfctrName0", .offset = 152, .bytes = 2, },
235 { .name = "nManfctrName1", .offset = 154, .bytes = 2, },
236 { .name = "nManfctrName2", .offset = 156, .bytes = 2, },
237 { .name = "nRSense", .offset = 158, .bytes = 2, },
238
239 { .name = "nUser1D0", .offset = 160, .bytes = 2, },
240 { .name = "nUser1D1", .offset = 162, .bytes = 2, },
241 { .name = "nAgeFcCfg", .offset = 164, .bytes = 2, },
242 { .name = "nDesignVoltage", .offset = 166, .bytes = 2, },
243 { .name = "nUser1D4", .offset = 168, .bytes = 2, },
244 { .name = "nRFastVShdn", .offset = 170, .bytes = 2, },
245 { .name = "nManfctrDate", .offset = 172, .bytes = 2, },
246 { .name = "nFirstUsed", .offset = 174, .bytes = 2, },
247 { .name = "nSerialNumber0", .offset = 176, .bytes = 2, },
248 { .name = "nSerialNumber1", .offset = 178, .bytes = 2, },
249 { .name = "nSerialNumber2", .offset = 180, .bytes = 2, },
250 { .name = "nDeviceName0", .offset = 182, .bytes = 2, },
251 { .name = "nDeviceName1", .offset = 184, .bytes = 2, },
252 { .name = "nDeviceName2", .offset = 186, .bytes = 2, },
253 { .name = "nDeviceName3", .offset = 188, .bytes = 2, },
254 { .name = "nDeviceName4", .offset = 190, .bytes = 2, },
255};
256
257static const enum power_supply_property max1720x_battery_props[] = {
258 POWER_SUPPLY_PROP_HEALTH,
259 POWER_SUPPLY_PROP_PRESENT,
260 POWER_SUPPLY_PROP_CAPACITY,
261 POWER_SUPPLY_PROP_VOLTAGE_NOW,
262 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
263 POWER_SUPPLY_PROP_CHARGE_AVG,
264 POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
265 POWER_SUPPLY_PROP_TIME_TO_FULL_AVG,
266 POWER_SUPPLY_PROP_TEMP,
267 POWER_SUPPLY_PROP_CURRENT_NOW,
268 POWER_SUPPLY_PROP_CURRENT_AVG,
269 POWER_SUPPLY_PROP_CHARGE_FULL,
270 POWER_SUPPLY_PROP_MODEL_NAME,
271 POWER_SUPPLY_PROP_MANUFACTURER,
272};
273
274/* Convert regs value to power_supply units */
275
276static int max172xx_time_to_ps(unsigned int reg)
277{
278 return reg * 5625 / 1000; /* in sec. */
279}
280
281static int max172xx_percent_to_ps(unsigned int reg)
282{
283 return reg / 256; /* in percent from 0 to 100 */
284}
285
286static int max172xx_voltage_to_ps(unsigned int reg)
287{
288 return reg * 1250; /* in uV */
289}
290
291static int max172xx_capacity_to_ps(unsigned int reg,
292 struct max1720x_device_info *info)
293{
294 return reg * (500000 / info->rsense); /* in uAh */
295}
296
297/*
298 * Current and temperature is signed values, so unsigned regs
299 * value must be converted to signed type
300 */
301
302static int max172xx_temperature_to_ps(unsigned int reg)
303{
304 int val = (int16_t)reg;
305
306 return val * 10 / 256; /* in tenths of deg. C */
307}
308
309/*
310 * Calculating current registers resolution:
311 *
312 * RSense stored in 10^-5 Ohm, so measurement voltage must be
313 * in 10^-11 Volts for get current in uA.
314 * 16 bit current reg fullscale +/-51.2mV is 102400 uV.
315 * So: 102400 / 65535 * 10^5 = 156252
316 */
317static int max172xx_current_to_voltage(unsigned int reg)
318{
319 int val = (int16_t)reg;
320
321 return val * 156252;
322}
323
324static int max172xx_battery_health(struct max1720x_device_info *info,
325 unsigned int *health)
326{
327 unsigned int status;
328 int ret;
329
330 ret = regmap_read(map: info->regmap, MAX172XX_STATUS, val: &status);
331 if (ret < 0)
332 return ret;
333
334 if (status & MAX172XX_STATUS_VMN)
335 *health = POWER_SUPPLY_HEALTH_DEAD;
336 else if (status & MAX172XX_STATUS_VMX)
337 *health = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
338 else if (status & MAX172XX_STATUS_TMN)
339 *health = POWER_SUPPLY_HEALTH_COLD;
340 else if (status & MAX172XX_STATUS_TMX)
341 *health = POWER_SUPPLY_HEALTH_OVERHEAT;
342 else if (status & MAX172XX_STATUS_IMX)
343 *health = POWER_SUPPLY_HEALTH_OVERCURRENT;
344 else
345 *health = POWER_SUPPLY_HEALTH_GOOD;
346
347 /* Clear events which are not self-clearing to detect next events */
348 if (status > 0 && status != MAX172XX_STATUS_IMX) {
349 ret = regmap_set_bits(map: info->regmap, MAX172XX_STATUS,
350 MAX172XX_STATUS_VMN |
351 MAX172XX_STATUS_VMX |
352 MAX172XX_STATUS_TMN |
353 MAX172XX_STATUS_TMX);
354 if (ret < 0)
355 return ret;
356 }
357
358 return 0;
359}
360
361static int max1720x_battery_get_property(struct power_supply *psy,
362 enum power_supply_property psp,
363 union power_supply_propval *val)
364{
365 struct max1720x_device_info *info = power_supply_get_drvdata(psy);
366 unsigned int reg_val;
367 int ret = 0;
368
369 switch (psp) {
370 case POWER_SUPPLY_PROP_HEALTH:
371 ret = max172xx_battery_health(info, health: &reg_val);
372 val->intval = reg_val;
373 break;
374 case POWER_SUPPLY_PROP_PRESENT:
375 /*
376 * POWER_SUPPLY_PROP_PRESENT will always readable via
377 * sysfs interface. Value return 0 if battery not
378 * present or unaccesable via I2c.
379 */
380 ret = regmap_read(map: info->regmap, MAX172XX_STATUS, val: &reg_val);
381 if (ret < 0) {
382 val->intval = 0;
383 return 0;
384 }
385
386 val->intval = !FIELD_GET(MAX172XX_STATUS_BAT_ABSENT, reg_val);
387 break;
388 case POWER_SUPPLY_PROP_CAPACITY:
389 ret = regmap_read(map: info->regmap, MAX172XX_REPSOC, val: &reg_val);
390 val->intval = max172xx_percent_to_ps(reg: reg_val);
391 break;
392 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
393 ret = regmap_read(map: info->regmap, MAX172XX_BATT, val: &reg_val);
394 val->intval = max172xx_voltage_to_ps(reg: reg_val);
395 break;
396 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
397 ret = regmap_read(map: info->regmap, MAX172XX_DESIGN_CAP, val: &reg_val);
398 val->intval = max172xx_capacity_to_ps(reg: reg_val, info);
399 break;
400 case POWER_SUPPLY_PROP_CHARGE_AVG:
401 ret = regmap_read(map: info->regmap, MAX172XX_REPCAP, val: &reg_val);
402 val->intval = max172xx_capacity_to_ps(reg: reg_val, info);
403 break;
404 case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
405 ret = regmap_read(map: info->regmap, MAX172XX_TTE, val: &reg_val);
406 val->intval = max172xx_time_to_ps(reg: reg_val);
407 break;
408 case POWER_SUPPLY_PROP_TIME_TO_FULL_AVG:
409 ret = regmap_read(map: info->regmap, MAX172XX_TTF, val: &reg_val);
410 val->intval = max172xx_time_to_ps(reg: reg_val);
411 break;
412 case POWER_SUPPLY_PROP_TEMP:
413 ret = regmap_read(map: info->regmap, MAX172XX_TEMP, val: &reg_val);
414 val->intval = max172xx_temperature_to_ps(reg: reg_val);
415 break;
416 case POWER_SUPPLY_PROP_CURRENT_NOW:
417 ret = regmap_read(map: info->regmap, MAX172XX_CURRENT, val: &reg_val);
418 val->intval = max172xx_current_to_voltage(reg: reg_val) / info->rsense;
419 break;
420 case POWER_SUPPLY_PROP_CURRENT_AVG:
421 ret = regmap_read(map: info->regmap, MAX172XX_AVG_CURRENT, val: &reg_val);
422 val->intval = max172xx_current_to_voltage(reg: reg_val) / info->rsense;
423 break;
424 case POWER_SUPPLY_PROP_CHARGE_FULL:
425 ret = regmap_read(map: info->regmap, MAX172XX_FULL_CAP, val: &reg_val);
426 val->intval = max172xx_capacity_to_ps(reg: reg_val, info);
427 break;
428 case POWER_SUPPLY_PROP_MODEL_NAME:
429 ret = regmap_read(map: info->regmap, MAX172XX_DEV_NAME, val: &reg_val);
430 if (ret)
431 return ret;
432 reg_val = FIELD_GET(MAX172XX_DEV_NAME_TYPE_MASK, reg_val);
433 if (reg_val == MAX172XX_DEV_NAME_TYPE_MAX17201)
434 val->strval = max17201_model;
435 else if (reg_val == MAX172XX_DEV_NAME_TYPE_MAX17205)
436 val->strval = max17205_model;
437 else
438 return -ENODEV;
439 break;
440 case POWER_SUPPLY_PROP_MANUFACTURER:
441 val->strval = max1720x_manufacturer;
442 break;
443 default:
444 return -EINVAL;
445 }
446
447 return ret;
448}
449
450static int max1720x_read_temp(struct device *dev, u8 reg, char *buf)
451{
452 struct power_supply *psy = dev_get_drvdata(dev);
453 struct max1720x_device_info *info = power_supply_get_drvdata(psy);
454 unsigned int val;
455 int ret;
456
457 ret = regmap_read(map: info->regmap_nv, reg, val: &val);
458 if (ret < 0)
459 return ret;
460
461 /*
462 * Temperature in degrees Celsius starting at absolute zero, -273C or
463 * 0K with an LSb of 0.1C
464 */
465 return sysfs_emit(buf, fmt: "%d\n", val - 2730);
466}
467
468static ssize_t temp_ain1_show(struct device *dev, struct device_attribute *attr,
469 char *buf)
470{
471 return max1720x_read_temp(dev, MAX172XX_TEMP1, buf);
472}
473
474static ssize_t temp_ain2_show(struct device *dev, struct device_attribute *attr,
475 char *buf)
476{
477 return max1720x_read_temp(dev, MAX172XX_TEMP2, buf);
478}
479
480static ssize_t temp_int_show(struct device *dev, struct device_attribute *attr,
481 char *buf)
482{
483 return max1720x_read_temp(dev, MAX172XX_INT_TEMP, buf);
484}
485
486static DEVICE_ATTR_RO(temp_ain1);
487static DEVICE_ATTR_RO(temp_ain2);
488static DEVICE_ATTR_RO(temp_int);
489
490static struct attribute *max1720x_attrs[] = {
491 &dev_attr_temp_ain1.attr,
492 &dev_attr_temp_ain2.attr,
493 &dev_attr_temp_int.attr,
494 NULL
495};
496ATTRIBUTE_GROUPS(max1720x);
497
498static
499int max1720x_nvmem_reg_read(void *priv, unsigned int off, void *val, size_t len)
500{
501 struct max1720x_device_info *info = priv;
502 unsigned int reg = MAX1720X_NXTABLE0 + (off / 2);
503
504 return regmap_bulk_read(map: info->regmap_nv, reg, val, val_count: len / 2);
505}
506
507static void max1720x_unregister_ancillary(void *data)
508{
509 struct max1720x_device_info *info = data;
510
511 i2c_unregister_device(client: info->ancillary);
512}
513
514static int max1720x_probe_nvmem(struct i2c_client *client,
515 struct max1720x_device_info *info)
516{
517 struct device *dev = &client->dev;
518 struct nvmem_config nvmem_config = {
519 .dev = dev,
520 .name = "max1720x_nvmem",
521 .cells = max1720x_nvmem_cells,
522 .ncells = ARRAY_SIZE(max1720x_nvmem_cells),
523 .read_only = true,
524 .root_only = true,
525 .reg_read = max1720x_nvmem_reg_read,
526 .size = ARRAY_SIZE(max1720x_nvmem_cells) * 2,
527 .word_size = 2,
528 .stride = 2,
529 .priv = info,
530 };
531 struct nvmem_device *nvmem;
532 unsigned int val;
533 int ret;
534
535 info->ancillary = i2c_new_ancillary_device(client, name: "nvmem", default_addr: 0xb);
536 if (IS_ERR(ptr: info->ancillary)) {
537 dev_err(dev, "Failed to initialize ancillary i2c device\n");
538 return PTR_ERR(ptr: info->ancillary);
539 }
540
541 ret = devm_add_action_or_reset(dev, max1720x_unregister_ancillary, info);
542 if (ret) {
543 dev_err(dev, "Failed to add unregister callback\n");
544 return ret;
545 }
546
547 info->regmap_nv = devm_regmap_init_i2c(info->ancillary,
548 &max1720x_nvmem_regmap_cfg);
549 if (IS_ERR(ptr: info->regmap_nv)) {
550 dev_err(dev, "regmap initialization of nvmem failed\n");
551 return PTR_ERR(ptr: info->regmap_nv);
552 }
553
554 ret = regmap_read(map: info->regmap_nv, MAX1720X_NRSENSE, val: &val);
555 if (ret < 0) {
556 dev_err(dev, "Failed to read sense resistor value\n");
557 return ret;
558 }
559
560 info->rsense = val;
561 if (!info->rsense) {
562 dev_warn(dev, "RSense not calibrated, set 10 mOhms!\n");
563 info->rsense = 1000; /* in regs in 10^-5 */
564 }
565
566 nvmem = devm_nvmem_register(dev, cfg: &nvmem_config);
567 if (IS_ERR(ptr: nvmem)) {
568 dev_err(dev, "Could not register nvmem!");
569 return PTR_ERR(ptr: nvmem);
570 }
571
572 return 0;
573}
574
575static const struct power_supply_desc max1720x_bat_desc = {
576 .name = "max1720x",
577 .no_thermal = true,
578 .type = POWER_SUPPLY_TYPE_BATTERY,
579 .properties = max1720x_battery_props,
580 .num_properties = ARRAY_SIZE(max1720x_battery_props),
581 .get_property = max1720x_battery_get_property,
582};
583
584static int max1720x_probe(struct i2c_client *client)
585{
586 struct power_supply_config psy_cfg = {};
587 struct device *dev = &client->dev;
588 struct max1720x_device_info *info;
589 struct power_supply *bat;
590 int ret;
591
592 info = devm_kzalloc(dev, size: sizeof(*info), GFP_KERNEL);
593 if (!info)
594 return -ENOMEM;
595
596 psy_cfg.drv_data = info;
597 psy_cfg.fwnode = dev_fwnode(dev);
598 psy_cfg.attr_grp = max1720x_groups;
599 i2c_set_clientdata(client, data: info);
600 info->regmap = devm_regmap_init_i2c(client, &max1720x_regmap_cfg);
601 if (IS_ERR(ptr: info->regmap))
602 return dev_err_probe(dev, err: PTR_ERR(ptr: info->regmap),
603 fmt: "regmap initialization failed\n");
604
605 ret = max1720x_probe_nvmem(client, info);
606 if (ret)
607 return dev_err_probe(dev, err: ret, fmt: "Failed to probe nvmem\n");
608
609 bat = devm_power_supply_register(parent: dev, desc: &max1720x_bat_desc, cfg: &psy_cfg);
610 if (IS_ERR(ptr: bat))
611 return dev_err_probe(dev, err: PTR_ERR(ptr: bat),
612 fmt: "Failed to register power supply\n");
613
614 return 0;
615}
616
617static const struct of_device_id max1720x_of_match[] = {
618 { .compatible = "maxim,max17201" },
619 {}
620};
621MODULE_DEVICE_TABLE(of, max1720x_of_match);
622
623static struct i2c_driver max1720x_i2c_driver = {
624 .driver = {
625 .name = "max1720x",
626 .of_match_table = max1720x_of_match,
627 },
628 .probe = max1720x_probe,
629};
630module_i2c_driver(max1720x_i2c_driver);
631
632MODULE_LICENSE("GPL");
633MODULE_AUTHOR("Dimitri Fedrau <dima.fedrau@gmail.com>");
634MODULE_DESCRIPTION("Maxim MAX17201/MAX17205 Fuel Gauge IC driver");
635

source code of linux/drivers/power/supply/max1720x_battery.c