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