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
57 static const char *const max1720x_manufacturer = "Maxim Integrated";
58 static const char *const max17201_model = "MAX17201";
59 static const char *const max17205_model = "MAX17205";
60
61 struct 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 */
72 static 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
78 static const struct regmap_range max1720x_readable_allow[] = {
79 regmap_reg_range(MAX172XX_STATUS, MAX172XX_ATAVCAP),
80 };
81
82 static 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
101 static 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
108 static 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
115 static 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
125 static 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
131 static 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
138 static 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
145 static 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
153 static 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
257 static 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
max172xx_time_to_ps(unsigned int reg)276 static int max172xx_time_to_ps(unsigned int reg)
277 {
278 return reg * 5625 / 1000; /* in sec. */
279 }
280
max172xx_percent_to_ps(unsigned int reg)281 static int max172xx_percent_to_ps(unsigned int reg)
282 {
283 return reg / 256; /* in percent from 0 to 100 */
284 }
285
max172xx_voltage_to_ps(unsigned int reg)286 static int max172xx_voltage_to_ps(unsigned int reg)
287 {
288 return reg * 1250; /* in uV */
289 }
290
max172xx_capacity_to_ps(unsigned int reg)291 static int max172xx_capacity_to_ps(unsigned int reg)
292 {
293 return reg * 500; /* in uAh */
294 }
295
296 /*
297 * Current and temperature is signed values, so unsigned regs
298 * value must be converted to signed type
299 */
300
max172xx_temperature_to_ps(unsigned int reg)301 static int max172xx_temperature_to_ps(unsigned int reg)
302 {
303 int val = (int16_t)reg;
304
305 return val * 10 / 256; /* in tenths of deg. C */
306 }
307
308 /*
309 * Calculating current registers resolution:
310 *
311 * RSense stored in 10^-5 Ohm, so measurement voltage must be
312 * in 10^-11 Volts for get current in uA.
313 * 16 bit current reg fullscale +/-51.2mV is 102400 uV.
314 * So: 102400 / 65535 * 10^5 = 156252
315 */
max172xx_current_to_voltage(unsigned int reg)316 static int max172xx_current_to_voltage(unsigned int reg)
317 {
318 int val = (int16_t)reg;
319
320 return val * 156252;
321 }
322
max172xx_battery_health(struct max1720x_device_info * info,unsigned int * health)323 static int max172xx_battery_health(struct max1720x_device_info *info,
324 unsigned int *health)
325 {
326 unsigned int status;
327 int ret;
328
329 ret = regmap_read(info->regmap, MAX172XX_STATUS, &status);
330 if (ret < 0)
331 return ret;
332
333 if (status & MAX172XX_STATUS_VMN)
334 *health = POWER_SUPPLY_HEALTH_DEAD;
335 else if (status & MAX172XX_STATUS_VMX)
336 *health = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
337 else if (status & MAX172XX_STATUS_TMN)
338 *health = POWER_SUPPLY_HEALTH_COLD;
339 else if (status & MAX172XX_STATUS_TMX)
340 *health = POWER_SUPPLY_HEALTH_OVERHEAT;
341 else if (status & MAX172XX_STATUS_IMX)
342 *health = POWER_SUPPLY_HEALTH_OVERCURRENT;
343 else
344 *health = POWER_SUPPLY_HEALTH_GOOD;
345
346 /* Clear events which are not self-clearing to detect next events */
347 if (status > 0 && status != MAX172XX_STATUS_IMX) {
348 ret = regmap_set_bits(info->regmap, MAX172XX_STATUS,
349 MAX172XX_STATUS_VMN |
350 MAX172XX_STATUS_VMX |
351 MAX172XX_STATUS_TMN |
352 MAX172XX_STATUS_TMX);
353 if (ret < 0)
354 return ret;
355 }
356
357 return 0;
358 }
359
max1720x_battery_get_property(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)360 static int max1720x_battery_get_property(struct power_supply *psy,
361 enum power_supply_property psp,
362 union power_supply_propval *val)
363 {
364 struct max1720x_device_info *info = power_supply_get_drvdata(psy);
365 unsigned int reg_val;
366 int ret = 0;
367
368 switch (psp) {
369 case POWER_SUPPLY_PROP_HEALTH:
370 ret = max172xx_battery_health(info, ®_val);
371 val->intval = reg_val;
372 break;
373 case POWER_SUPPLY_PROP_PRESENT:
374 /*
375 * POWER_SUPPLY_PROP_PRESENT will always readable via
376 * sysfs interface. Value return 0 if battery not
377 * present or unaccesable via I2c.
378 */
379 ret = regmap_read(info->regmap, MAX172XX_STATUS, ®_val);
380 if (ret < 0) {
381 val->intval = 0;
382 return 0;
383 }
384
385 val->intval = !FIELD_GET(MAX172XX_STATUS_BAT_ABSENT, reg_val);
386 break;
387 case POWER_SUPPLY_PROP_CAPACITY:
388 ret = regmap_read(info->regmap, MAX172XX_REPSOC, ®_val);
389 val->intval = max172xx_percent_to_ps(reg_val);
390 break;
391 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
392 ret = regmap_read(info->regmap, MAX172XX_BATT, ®_val);
393 val->intval = max172xx_voltage_to_ps(reg_val);
394 break;
395 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
396 ret = regmap_read(info->regmap, MAX172XX_DESIGN_CAP, ®_val);
397 val->intval = max172xx_capacity_to_ps(reg_val);
398 break;
399 case POWER_SUPPLY_PROP_CHARGE_AVG:
400 ret = regmap_read(info->regmap, MAX172XX_REPCAP, ®_val);
401 val->intval = max172xx_capacity_to_ps(reg_val);
402 break;
403 case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
404 ret = regmap_read(info->regmap, MAX172XX_TTE, ®_val);
405 val->intval = max172xx_time_to_ps(reg_val);
406 break;
407 case POWER_SUPPLY_PROP_TIME_TO_FULL_AVG:
408 ret = regmap_read(info->regmap, MAX172XX_TTF, ®_val);
409 val->intval = max172xx_time_to_ps(reg_val);
410 break;
411 case POWER_SUPPLY_PROP_TEMP:
412 ret = regmap_read(info->regmap, MAX172XX_TEMP, ®_val);
413 val->intval = max172xx_temperature_to_ps(reg_val);
414 break;
415 case POWER_SUPPLY_PROP_CURRENT_NOW:
416 ret = regmap_read(info->regmap, MAX172XX_CURRENT, ®_val);
417 val->intval = max172xx_current_to_voltage(reg_val) / info->rsense;
418 break;
419 case POWER_SUPPLY_PROP_CURRENT_AVG:
420 ret = regmap_read(info->regmap, MAX172XX_AVG_CURRENT, ®_val);
421 val->intval = max172xx_current_to_voltage(reg_val) / info->rsense;
422 break;
423 case POWER_SUPPLY_PROP_CHARGE_FULL:
424 ret = regmap_read(info->regmap, MAX172XX_FULL_CAP, ®_val);
425 val->intval = max172xx_capacity_to_ps(reg_val);
426 break;
427 case POWER_SUPPLY_PROP_MODEL_NAME:
428 ret = regmap_read(info->regmap, MAX172XX_DEV_NAME, ®_val);
429 reg_val = FIELD_GET(MAX172XX_DEV_NAME_TYPE_MASK, reg_val);
430 if (reg_val == MAX172XX_DEV_NAME_TYPE_MAX17201)
431 val->strval = max17201_model;
432 else if (reg_val == MAX172XX_DEV_NAME_TYPE_MAX17205)
433 val->strval = max17205_model;
434 else
435 return -ENODEV;
436 break;
437 case POWER_SUPPLY_PROP_MANUFACTURER:
438 val->strval = max1720x_manufacturer;
439 break;
440 default:
441 return -EINVAL;
442 }
443
444 return ret;
445 }
446
max1720x_read_temp(struct device * dev,u8 reg,char * buf)447 static int max1720x_read_temp(struct device *dev, u8 reg, char *buf)
448 {
449 struct power_supply *psy = dev_get_drvdata(dev);
450 struct max1720x_device_info *info = power_supply_get_drvdata(psy);
451 unsigned int val;
452 int ret;
453
454 ret = regmap_read(info->regmap_nv, reg, &val);
455 if (ret < 0)
456 return ret;
457
458 /*
459 * Temperature in degrees Celsius starting at absolute zero, -273C or
460 * 0K with an LSb of 0.1C
461 */
462 return sysfs_emit(buf, "%d\n", val - 2730);
463 }
464
temp_ain1_show(struct device * dev,struct device_attribute * attr,char * buf)465 static ssize_t temp_ain1_show(struct device *dev, struct device_attribute *attr,
466 char *buf)
467 {
468 return max1720x_read_temp(dev, MAX172XX_TEMP1, buf);
469 }
470
temp_ain2_show(struct device * dev,struct device_attribute * attr,char * buf)471 static ssize_t temp_ain2_show(struct device *dev, struct device_attribute *attr,
472 char *buf)
473 {
474 return max1720x_read_temp(dev, MAX172XX_TEMP2, buf);
475 }
476
temp_int_show(struct device * dev,struct device_attribute * attr,char * buf)477 static ssize_t temp_int_show(struct device *dev, struct device_attribute *attr,
478 char *buf)
479 {
480 return max1720x_read_temp(dev, MAX172XX_INT_TEMP, buf);
481 }
482
483 static DEVICE_ATTR_RO(temp_ain1);
484 static DEVICE_ATTR_RO(temp_ain2);
485 static DEVICE_ATTR_RO(temp_int);
486
487 static struct attribute *max1720x_attrs[] = {
488 &dev_attr_temp_ain1.attr,
489 &dev_attr_temp_ain2.attr,
490 &dev_attr_temp_int.attr,
491 NULL
492 };
493 ATTRIBUTE_GROUPS(max1720x);
494
495 static
max1720x_nvmem_reg_read(void * priv,unsigned int off,void * val,size_t len)496 int max1720x_nvmem_reg_read(void *priv, unsigned int off, void *val, size_t len)
497 {
498 struct max1720x_device_info *info = priv;
499 unsigned int reg = MAX1720X_NXTABLE0 + (off / 2);
500
501 return regmap_bulk_read(info->regmap_nv, reg, val, len / 2);
502 }
503
max1720x_unregister_ancillary(void * data)504 static void max1720x_unregister_ancillary(void *data)
505 {
506 struct max1720x_device_info *info = data;
507
508 i2c_unregister_device(info->ancillary);
509 }
510
max1720x_probe_nvmem(struct i2c_client * client,struct max1720x_device_info * info)511 static int max1720x_probe_nvmem(struct i2c_client *client,
512 struct max1720x_device_info *info)
513 {
514 struct device *dev = &client->dev;
515 struct nvmem_config nvmem_config = {
516 .dev = dev,
517 .name = "max1720x_nvmem",
518 .cells = max1720x_nvmem_cells,
519 .ncells = ARRAY_SIZE(max1720x_nvmem_cells),
520 .read_only = true,
521 .root_only = true,
522 .reg_read = max1720x_nvmem_reg_read,
523 .size = ARRAY_SIZE(max1720x_nvmem_cells) * 2,
524 .word_size = 2,
525 .stride = 2,
526 .priv = info,
527 };
528 struct nvmem_device *nvmem;
529 unsigned int val;
530 int ret;
531
532 info->ancillary = i2c_new_ancillary_device(client, "nvmem", 0xb);
533 if (IS_ERR(info->ancillary)) {
534 dev_err(dev, "Failed to initialize ancillary i2c device\n");
535 return PTR_ERR(info->ancillary);
536 }
537
538 ret = devm_add_action_or_reset(dev, max1720x_unregister_ancillary, info);
539 if (ret) {
540 dev_err(dev, "Failed to add unregister callback\n");
541 return ret;
542 }
543
544 info->regmap_nv = devm_regmap_init_i2c(info->ancillary,
545 &max1720x_nvmem_regmap_cfg);
546 if (IS_ERR(info->regmap_nv)) {
547 dev_err(dev, "regmap initialization of nvmem failed\n");
548 return PTR_ERR(info->regmap_nv);
549 }
550
551 ret = regmap_read(info->regmap_nv, MAX1720X_NRSENSE, &val);
552 if (ret < 0) {
553 dev_err(dev, "Failed to read sense resistor value\n");
554 return ret;
555 }
556
557 info->rsense = val;
558 if (!info->rsense) {
559 dev_warn(dev, "RSense not calibrated, set 10 mOhms!\n");
560 info->rsense = 1000; /* in regs in 10^-5 */
561 }
562
563 nvmem = devm_nvmem_register(dev, &nvmem_config);
564 if (IS_ERR(nvmem)) {
565 dev_err(dev, "Could not register nvmem!");
566 return PTR_ERR(nvmem);
567 }
568
569 return 0;
570 }
571
572 static const struct power_supply_desc max1720x_bat_desc = {
573 .name = "max1720x",
574 .no_thermal = true,
575 .type = POWER_SUPPLY_TYPE_BATTERY,
576 .properties = max1720x_battery_props,
577 .num_properties = ARRAY_SIZE(max1720x_battery_props),
578 .get_property = max1720x_battery_get_property,
579 };
580
max1720x_probe(struct i2c_client * client)581 static int max1720x_probe(struct i2c_client *client)
582 {
583 struct power_supply_config psy_cfg = {};
584 struct device *dev = &client->dev;
585 struct max1720x_device_info *info;
586 struct power_supply *bat;
587 int ret;
588
589 info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL);
590 if (!info)
591 return -ENOMEM;
592
593 psy_cfg.drv_data = info;
594 psy_cfg.fwnode = dev_fwnode(dev);
595 psy_cfg.attr_grp = max1720x_groups;
596 i2c_set_clientdata(client, info);
597 info->regmap = devm_regmap_init_i2c(client, &max1720x_regmap_cfg);
598 if (IS_ERR(info->regmap))
599 return dev_err_probe(dev, PTR_ERR(info->regmap),
600 "regmap initialization failed\n");
601
602 ret = max1720x_probe_nvmem(client, info);
603 if (ret)
604 return dev_err_probe(dev, ret, "Failed to probe nvmem\n");
605
606 bat = devm_power_supply_register(dev, &max1720x_bat_desc, &psy_cfg);
607 if (IS_ERR(bat))
608 return dev_err_probe(dev, PTR_ERR(bat),
609 "Failed to register power supply\n");
610
611 return 0;
612 }
613
614 static const struct of_device_id max1720x_of_match[] = {
615 { .compatible = "maxim,max17201" },
616 {}
617 };
618 MODULE_DEVICE_TABLE(of, max1720x_of_match);
619
620 static struct i2c_driver max1720x_i2c_driver = {
621 .driver = {
622 .name = "max1720x",
623 .of_match_table = max1720x_of_match,
624 },
625 .probe = max1720x_probe,
626 };
627 module_i2c_driver(max1720x_i2c_driver);
628
629 MODULE_LICENSE("GPL");
630 MODULE_AUTHOR("Dimitri Fedrau <dima.fedrau@gmail.com>");
631 MODULE_DESCRIPTION("Maxim MAX17201/MAX17205 Fuel Gauge IC driver");
632