1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * I2C client/driver for the Linear Technology LTC2941, LTC2942, LTC2943
4 * and LTC2944 Battery Gas Gauge IC
5 *
6 * Copyright (C) 2014 Topic Embedded Systems
7 *
8 * Author: Auryn Verwegen
9 * Author: Mike Looijmans
10 */
11 #include <linux/devm-helpers.h>
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/of_device.h>
15 #include <linux/types.h>
16 #include <linux/errno.h>
17 #include <linux/swab.h>
18 #include <linux/i2c.h>
19 #include <linux/delay.h>
20 #include <linux/power_supply.h>
21 #include <linux/slab.h>
22
23 #define I16_MSB(x) ((x >> 8) & 0xFF)
24 #define I16_LSB(x) (x & 0xFF)
25
26 #define LTC294X_WORK_DELAY 10 /* Update delay in seconds */
27
28 #define LTC294X_MAX_VALUE 0xFFFF
29 #define LTC294X_MID_SUPPLY 0x7FFF
30
31 #define LTC2941_MAX_PRESCALER_EXP 7
32 #define LTC2943_MAX_PRESCALER_EXP 6
33
34 enum ltc294x_reg {
35 LTC294X_REG_STATUS = 0x00,
36 LTC294X_REG_CONTROL = 0x01,
37 LTC294X_REG_ACC_CHARGE_MSB = 0x02,
38 LTC294X_REG_ACC_CHARGE_LSB = 0x03,
39 LTC294X_REG_CHARGE_THR_HIGH_MSB = 0x04,
40 LTC294X_REG_CHARGE_THR_HIGH_LSB = 0x05,
41 LTC294X_REG_CHARGE_THR_LOW_MSB = 0x06,
42 LTC294X_REG_CHARGE_THR_LOW_LSB = 0x07,
43 LTC294X_REG_VOLTAGE_MSB = 0x08,
44 LTC294X_REG_VOLTAGE_LSB = 0x09,
45 LTC2942_REG_TEMPERATURE_MSB = 0x0C,
46 LTC2942_REG_TEMPERATURE_LSB = 0x0D,
47 LTC2943_REG_CURRENT_MSB = 0x0E,
48 LTC2943_REG_CURRENT_LSB = 0x0F,
49 LTC2943_REG_TEMPERATURE_MSB = 0x14,
50 LTC2943_REG_TEMPERATURE_LSB = 0x15,
51 };
52
53 enum ltc294x_id {
54 LTC2941_ID,
55 LTC2942_ID,
56 LTC2943_ID,
57 LTC2944_ID,
58 };
59
60 #define LTC2941_REG_STATUS_CHIP_ID BIT(7)
61
62 #define LTC2942_REG_CONTROL_MODE_SCAN (BIT(7) | BIT(6))
63 #define LTC2943_REG_CONTROL_MODE_SCAN BIT(7)
64 #define LTC294X_REG_CONTROL_PRESCALER_MASK (BIT(5) | BIT(4) | BIT(3))
65 #define LTC294X_REG_CONTROL_SHUTDOWN_MASK (BIT(0))
66 #define LTC294X_REG_CONTROL_PRESCALER_SET(x) \
67 ((x << 3) & LTC294X_REG_CONTROL_PRESCALER_MASK)
68 #define LTC294X_REG_CONTROL_ALCC_CONFIG_DISABLED 0
69 #define LTC294X_REG_CONTROL_ADC_DISABLE(x) ((x) & ~(BIT(7) | BIT(6)))
70
71 struct ltc294x_info {
72 struct i2c_client *client; /* I2C Client pointer */
73 struct power_supply *supply; /* Supply pointer */
74 struct power_supply_desc supply_desc; /* Supply description */
75 struct delayed_work work; /* Work scheduler */
76 enum ltc294x_id id; /* Chip type */
77 int charge; /* Last charge register content */
78 int r_sense; /* mOhm */
79 int Qlsb; /* nAh */
80 };
81
convert_bin_to_uAh(const struct ltc294x_info * info,int Q)82 static inline int convert_bin_to_uAh(
83 const struct ltc294x_info *info, int Q)
84 {
85 return ((Q * (info->Qlsb / 10))) / 100;
86 }
87
convert_uAh_to_bin(const struct ltc294x_info * info,int uAh)88 static inline int convert_uAh_to_bin(
89 const struct ltc294x_info *info, int uAh)
90 {
91 int Q;
92
93 Q = (uAh * 100) / (info->Qlsb/10);
94 return (Q < LTC294X_MAX_VALUE) ? Q : LTC294X_MAX_VALUE;
95 }
96
ltc294x_read_regs(struct i2c_client * client,enum ltc294x_reg reg,u8 * buf,int num_regs)97 static int ltc294x_read_regs(struct i2c_client *client,
98 enum ltc294x_reg reg, u8 *buf, int num_regs)
99 {
100 int ret;
101 struct i2c_msg msgs[2] = { };
102 u8 reg_start = reg;
103
104 msgs[0].addr = client->addr;
105 msgs[0].len = 1;
106 msgs[0].buf = ®_start;
107
108 msgs[1].addr = client->addr;
109 msgs[1].len = num_regs;
110 msgs[1].buf = buf;
111 msgs[1].flags = I2C_M_RD;
112
113 ret = i2c_transfer(client->adapter, &msgs[0], 2);
114 if (ret < 0) {
115 dev_err(&client->dev, "ltc2941 read_reg(0x%x[%d]) failed: %pe\n",
116 reg, num_regs, ERR_PTR(ret));
117 return ret;
118 }
119
120 dev_dbg(&client->dev, "%s (%#x, %d) -> %#x\n",
121 __func__, reg, num_regs, *buf);
122
123 return 0;
124 }
125
ltc294x_write_regs(struct i2c_client * client,enum ltc294x_reg reg,const u8 * buf,int num_regs)126 static int ltc294x_write_regs(struct i2c_client *client,
127 enum ltc294x_reg reg, const u8 *buf, int num_regs)
128 {
129 int ret;
130 u8 reg_start = reg;
131
132 ret = i2c_smbus_write_i2c_block_data(client, reg_start, num_regs, buf);
133 if (ret < 0) {
134 dev_err(&client->dev, "ltc2941 write_reg(0x%x[%d]) failed: %pe\n",
135 reg, num_regs, ERR_PTR(ret));
136 return ret;
137 }
138
139 dev_dbg(&client->dev, "%s (%#x, %d) -> %#x\n",
140 __func__, reg, num_regs, *buf);
141
142 return 0;
143 }
144
ltc294x_reset(const struct ltc294x_info * info,int prescaler_exp)145 static int ltc294x_reset(const struct ltc294x_info *info, int prescaler_exp)
146 {
147 int ret;
148 u8 value;
149 u8 control;
150
151 /* Read status and control registers */
152 ret = ltc294x_read_regs(info->client, LTC294X_REG_CONTROL, &value, 1);
153 if (ret < 0)
154 return ret;
155
156 control = LTC294X_REG_CONTROL_PRESCALER_SET(prescaler_exp) |
157 LTC294X_REG_CONTROL_ALCC_CONFIG_DISABLED;
158 /* Put device into "monitor" mode */
159 switch (info->id) {
160 case LTC2942_ID: /* 2942 measures every 2 sec */
161 control |= LTC2942_REG_CONTROL_MODE_SCAN;
162 break;
163 case LTC2943_ID:
164 case LTC2944_ID: /* 2943 and 2944 measure every 10 sec */
165 control |= LTC2943_REG_CONTROL_MODE_SCAN;
166 break;
167 default:
168 break;
169 }
170
171 if (value != control) {
172 ret = ltc294x_write_regs(info->client,
173 LTC294X_REG_CONTROL, &control, 1);
174 if (ret < 0)
175 return ret;
176 }
177
178 return 0;
179 }
180
ltc294x_read_charge_register(const struct ltc294x_info * info,enum ltc294x_reg reg)181 static int ltc294x_read_charge_register(const struct ltc294x_info *info,
182 enum ltc294x_reg reg)
183 {
184 int ret;
185 u8 datar[2];
186
187 ret = ltc294x_read_regs(info->client, reg, &datar[0], 2);
188 if (ret < 0)
189 return ret;
190 return (datar[0] << 8) + datar[1];
191 }
192
ltc294x_get_charge(const struct ltc294x_info * info,enum ltc294x_reg reg,int * val)193 static int ltc294x_get_charge(const struct ltc294x_info *info,
194 enum ltc294x_reg reg, int *val)
195 {
196 int value = ltc294x_read_charge_register(info, reg);
197
198 if (value < 0)
199 return value;
200 /* When r_sense < 0, this counts up when the battery discharges */
201 if (info->Qlsb < 0)
202 value -= 0xFFFF;
203 *val = convert_bin_to_uAh(info, value);
204 return 0;
205 }
206
ltc294x_set_charge_now(const struct ltc294x_info * info,int val)207 static int ltc294x_set_charge_now(const struct ltc294x_info *info, int val)
208 {
209 int ret;
210 u8 dataw[2];
211 u8 ctrl_reg;
212 s32 value;
213
214 value = convert_uAh_to_bin(info, val);
215 /* Direction depends on how sense+/- were connected */
216 if (info->Qlsb < 0)
217 value += 0xFFFF;
218 if ((value < 0) || (value > 0xFFFF)) /* input validation */
219 return -EINVAL;
220
221 /* Read control register */
222 ret = ltc294x_read_regs(info->client,
223 LTC294X_REG_CONTROL, &ctrl_reg, 1);
224 if (ret < 0)
225 return ret;
226 /* Disable analog section */
227 ctrl_reg |= LTC294X_REG_CONTROL_SHUTDOWN_MASK;
228 ret = ltc294x_write_regs(info->client,
229 LTC294X_REG_CONTROL, &ctrl_reg, 1);
230 if (ret < 0)
231 return ret;
232 /* Set new charge value */
233 dataw[0] = I16_MSB(value);
234 dataw[1] = I16_LSB(value);
235 ret = ltc294x_write_regs(info->client,
236 LTC294X_REG_ACC_CHARGE_MSB, &dataw[0], 2);
237 if (ret < 0)
238 goto error_exit;
239 /* Enable analog section */
240 error_exit:
241 ctrl_reg &= ~LTC294X_REG_CONTROL_SHUTDOWN_MASK;
242 ret = ltc294x_write_regs(info->client,
243 LTC294X_REG_CONTROL, &ctrl_reg, 1);
244
245 return ret < 0 ? ret : 0;
246 }
247
ltc294x_set_charge_thr(const struct ltc294x_info * info,enum ltc294x_reg reg,int val)248 static int ltc294x_set_charge_thr(const struct ltc294x_info *info,
249 enum ltc294x_reg reg, int val)
250 {
251 u8 dataw[2];
252 s32 value;
253
254 value = convert_uAh_to_bin(info, val);
255 /* Direction depends on how sense+/- were connected */
256 if (info->Qlsb < 0)
257 value += 0xFFFF;
258 if ((value < 0) || (value > 0xFFFF)) /* input validation */
259 return -EINVAL;
260
261 /* Set new charge value */
262 dataw[0] = I16_MSB(value);
263 dataw[1] = I16_LSB(value);
264 return ltc294x_write_regs(info->client, reg, &dataw[0], 2);
265 }
266
ltc294x_get_charge_counter(const struct ltc294x_info * info,int * val)267 static int ltc294x_get_charge_counter(
268 const struct ltc294x_info *info, int *val)
269 {
270 int value = ltc294x_read_charge_register(info, LTC294X_REG_ACC_CHARGE_MSB);
271
272 if (value < 0)
273 return value;
274 value -= LTC294X_MID_SUPPLY;
275 *val = convert_bin_to_uAh(info, value);
276 return 0;
277 }
278
ltc294x_get_voltage(const struct ltc294x_info * info,int * val)279 static int ltc294x_get_voltage(const struct ltc294x_info *info, int *val)
280 {
281 int ret;
282 u8 datar[2];
283 u32 value;
284
285 ret = ltc294x_read_regs(info->client,
286 LTC294X_REG_VOLTAGE_MSB, &datar[0], 2);
287 value = (datar[0] << 8) | datar[1];
288 switch (info->id) {
289 case LTC2943_ID:
290 value *= 23600 * 2;
291 value /= 0xFFFF;
292 value *= 1000 / 2;
293 break;
294 case LTC2944_ID:
295 value *= 70800 / 5*4;
296 value /= 0xFFFF;
297 value *= 1000 * 5/4;
298 break;
299 default:
300 value *= 6000 * 10;
301 value /= 0xFFFF;
302 value *= 1000 / 10;
303 break;
304 }
305 *val = value;
306 return ret;
307 }
308
ltc294x_get_current(const struct ltc294x_info * info,int * val)309 static int ltc294x_get_current(const struct ltc294x_info *info, int *val)
310 {
311 int ret;
312 u8 datar[2];
313 s32 value;
314
315 ret = ltc294x_read_regs(info->client,
316 LTC2943_REG_CURRENT_MSB, &datar[0], 2);
317 value = (datar[0] << 8) | datar[1];
318 value -= 0x7FFF;
319 if (info->id == LTC2944_ID)
320 value *= 64000;
321 else
322 value *= 60000;
323 /* Value is in range -32k..+32k, r_sense is usually 10..50 mOhm,
324 * the formula below keeps everything in s32 range while preserving
325 * enough digits */
326 *val = 1000 * (value / (info->r_sense * 0x7FFF)); /* in uA */
327 return ret;
328 }
329
ltc294x_get_temperature(const struct ltc294x_info * info,int * val)330 static int ltc294x_get_temperature(const struct ltc294x_info *info, int *val)
331 {
332 enum ltc294x_reg reg;
333 int ret;
334 u8 datar[2];
335 u32 value;
336
337 if (info->id == LTC2942_ID) {
338 reg = LTC2942_REG_TEMPERATURE_MSB;
339 value = 6000; /* Full-scale is 600 Kelvin */
340 } else {
341 reg = LTC2943_REG_TEMPERATURE_MSB;
342 value = 5100; /* Full-scale is 510 Kelvin */
343 }
344 ret = ltc294x_read_regs(info->client, reg, &datar[0], 2);
345 value *= (datar[0] << 8) | datar[1];
346 /* Convert to tenths of degree Celsius */
347 *val = value / 0xFFFF - 2722;
348 return ret;
349 }
350
ltc294x_get_property(struct power_supply * psy,enum power_supply_property prop,union power_supply_propval * val)351 static int ltc294x_get_property(struct power_supply *psy,
352 enum power_supply_property prop,
353 union power_supply_propval *val)
354 {
355 struct ltc294x_info *info = power_supply_get_drvdata(psy);
356
357 switch (prop) {
358 case POWER_SUPPLY_PROP_CHARGE_FULL:
359 return ltc294x_get_charge(info, LTC294X_REG_CHARGE_THR_HIGH_MSB,
360 &val->intval);
361 case POWER_SUPPLY_PROP_CHARGE_EMPTY:
362 return ltc294x_get_charge(info, LTC294X_REG_CHARGE_THR_LOW_MSB,
363 &val->intval);
364 case POWER_SUPPLY_PROP_CHARGE_NOW:
365 return ltc294x_get_charge(info, LTC294X_REG_ACC_CHARGE_MSB,
366 &val->intval);
367 case POWER_SUPPLY_PROP_CHARGE_COUNTER:
368 return ltc294x_get_charge_counter(info, &val->intval);
369 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
370 return ltc294x_get_voltage(info, &val->intval);
371 case POWER_SUPPLY_PROP_CURRENT_NOW:
372 return ltc294x_get_current(info, &val->intval);
373 case POWER_SUPPLY_PROP_TEMP:
374 return ltc294x_get_temperature(info, &val->intval);
375 default:
376 return -EINVAL;
377 }
378 }
379
ltc294x_set_property(struct power_supply * psy,enum power_supply_property psp,const union power_supply_propval * val)380 static int ltc294x_set_property(struct power_supply *psy,
381 enum power_supply_property psp,
382 const union power_supply_propval *val)
383 {
384 struct ltc294x_info *info = power_supply_get_drvdata(psy);
385
386 switch (psp) {
387 case POWER_SUPPLY_PROP_CHARGE_FULL:
388 return ltc294x_set_charge_thr(info,
389 LTC294X_REG_CHARGE_THR_HIGH_MSB, val->intval);
390 case POWER_SUPPLY_PROP_CHARGE_EMPTY:
391 return ltc294x_set_charge_thr(info,
392 LTC294X_REG_CHARGE_THR_LOW_MSB, val->intval);
393 case POWER_SUPPLY_PROP_CHARGE_NOW:
394 return ltc294x_set_charge_now(info, val->intval);
395 default:
396 return -EPERM;
397 }
398 }
399
ltc294x_property_is_writeable(struct power_supply * psy,enum power_supply_property psp)400 static int ltc294x_property_is_writeable(
401 struct power_supply *psy, enum power_supply_property psp)
402 {
403 switch (psp) {
404 case POWER_SUPPLY_PROP_CHARGE_FULL:
405 case POWER_SUPPLY_PROP_CHARGE_EMPTY:
406 case POWER_SUPPLY_PROP_CHARGE_NOW:
407 return 1;
408 default:
409 return 0;
410 }
411 }
412
ltc294x_update(struct ltc294x_info * info)413 static void ltc294x_update(struct ltc294x_info *info)
414 {
415 int charge = ltc294x_read_charge_register(info, LTC294X_REG_ACC_CHARGE_MSB);
416
417 if (charge != info->charge) {
418 info->charge = charge;
419 power_supply_changed(info->supply);
420 }
421 }
422
ltc294x_work(struct work_struct * work)423 static void ltc294x_work(struct work_struct *work)
424 {
425 struct ltc294x_info *info;
426
427 info = container_of(work, struct ltc294x_info, work.work);
428 ltc294x_update(info);
429 schedule_delayed_work(&info->work, LTC294X_WORK_DELAY * HZ);
430 }
431
432 static enum power_supply_property ltc294x_properties[] = {
433 POWER_SUPPLY_PROP_CHARGE_COUNTER,
434 POWER_SUPPLY_PROP_CHARGE_FULL,
435 POWER_SUPPLY_PROP_CHARGE_EMPTY,
436 POWER_SUPPLY_PROP_CHARGE_NOW,
437 POWER_SUPPLY_PROP_VOLTAGE_NOW,
438 POWER_SUPPLY_PROP_TEMP,
439 POWER_SUPPLY_PROP_CURRENT_NOW,
440 };
441
ltc294x_i2c_probe(struct i2c_client * client,const struct i2c_device_id * id)442 static int ltc294x_i2c_probe(struct i2c_client *client,
443 const struct i2c_device_id *id)
444 {
445 struct power_supply_config psy_cfg = {};
446 struct ltc294x_info *info;
447 struct device_node *np;
448 int ret;
449 u32 prescaler_exp;
450 s32 r_sense;
451 u8 status;
452
453 info = devm_kzalloc(&client->dev, sizeof(*info), GFP_KERNEL);
454 if (info == NULL)
455 return -ENOMEM;
456
457 i2c_set_clientdata(client, info);
458
459 np = of_node_get(client->dev.of_node);
460
461 info->id = (enum ltc294x_id) (uintptr_t) of_device_get_match_data(
462 &client->dev);
463 info->supply_desc.name = np->name;
464
465 /* r_sense can be negative, when sense+ is connected to the battery
466 * instead of the sense-. This results in reversed measurements. */
467 ret = of_property_read_u32(np, "lltc,resistor-sense", &r_sense);
468 if (ret < 0)
469 return dev_err_probe(&client->dev, ret,
470 "Could not find lltc,resistor-sense in devicetree\n");
471 info->r_sense = r_sense;
472
473 ret = of_property_read_u32(np, "lltc,prescaler-exponent",
474 &prescaler_exp);
475 if (ret < 0) {
476 dev_warn(&client->dev,
477 "lltc,prescaler-exponent not in devicetree\n");
478 prescaler_exp = LTC2941_MAX_PRESCALER_EXP;
479 }
480
481 if (info->id == LTC2943_ID) {
482 if (prescaler_exp > LTC2943_MAX_PRESCALER_EXP)
483 prescaler_exp = LTC2943_MAX_PRESCALER_EXP;
484 info->Qlsb = ((340 * 50000) / r_sense) >>
485 (12 - 2*prescaler_exp);
486 } else {
487 if (prescaler_exp > LTC2941_MAX_PRESCALER_EXP)
488 prescaler_exp = LTC2941_MAX_PRESCALER_EXP;
489 info->Qlsb = ((85 * 50000) / r_sense) >>
490 (7 - prescaler_exp);
491 }
492
493 /* Read status register to check for LTC2942 */
494 if (info->id == LTC2941_ID || info->id == LTC2942_ID) {
495 ret = ltc294x_read_regs(client, LTC294X_REG_STATUS, &status, 1);
496 if (ret < 0)
497 return dev_err_probe(&client->dev, ret,
498 "Could not read status register\n");
499 if (status & LTC2941_REG_STATUS_CHIP_ID)
500 info->id = LTC2941_ID;
501 else
502 info->id = LTC2942_ID;
503 }
504
505 info->client = client;
506 info->supply_desc.type = POWER_SUPPLY_TYPE_BATTERY;
507 info->supply_desc.properties = ltc294x_properties;
508 switch (info->id) {
509 case LTC2944_ID:
510 case LTC2943_ID:
511 info->supply_desc.num_properties =
512 ARRAY_SIZE(ltc294x_properties);
513 break;
514 case LTC2942_ID:
515 info->supply_desc.num_properties =
516 ARRAY_SIZE(ltc294x_properties) - 1;
517 break;
518 case LTC2941_ID:
519 default:
520 info->supply_desc.num_properties =
521 ARRAY_SIZE(ltc294x_properties) - 3;
522 break;
523 }
524 info->supply_desc.get_property = ltc294x_get_property;
525 info->supply_desc.set_property = ltc294x_set_property;
526 info->supply_desc.property_is_writeable = ltc294x_property_is_writeable;
527 info->supply_desc.external_power_changed = NULL;
528
529 psy_cfg.drv_data = info;
530
531 ret = devm_delayed_work_autocancel(&client->dev, &info->work,
532 ltc294x_work);
533 if (ret)
534 return ret;
535
536 ret = ltc294x_reset(info, prescaler_exp);
537 if (ret < 0)
538 return dev_err_probe(&client->dev, ret,
539 "Communication with chip failed\n");
540
541 info->supply = devm_power_supply_register(&client->dev,
542 &info->supply_desc, &psy_cfg);
543 if (IS_ERR(info->supply))
544 return dev_err_probe(&client->dev, PTR_ERR(info->supply),
545 "failed to register ltc2941\n");
546
547 schedule_delayed_work(&info->work, LTC294X_WORK_DELAY * HZ);
548
549 return 0;
550 }
551
ltc294x_i2c_shutdown(struct i2c_client * client)552 static void ltc294x_i2c_shutdown(struct i2c_client *client)
553 {
554 struct ltc294x_info *info = i2c_get_clientdata(client);
555 int ret;
556 u8 value;
557 u8 control;
558
559 /* The LTC2941 does not need any special handling */
560 if (info->id == LTC2941_ID)
561 return;
562
563 /* Read control register */
564 ret = ltc294x_read_regs(info->client, LTC294X_REG_CONTROL, &value, 1);
565 if (ret < 0)
566 return;
567
568 /* Disable continuous ADC conversion as this drains the battery */
569 control = LTC294X_REG_CONTROL_ADC_DISABLE(value);
570 if (control != value)
571 ltc294x_write_regs(info->client, LTC294X_REG_CONTROL,
572 &control, 1);
573 }
574
575 #ifdef CONFIG_PM_SLEEP
576
ltc294x_suspend(struct device * dev)577 static int ltc294x_suspend(struct device *dev)
578 {
579 struct i2c_client *client = to_i2c_client(dev);
580 struct ltc294x_info *info = i2c_get_clientdata(client);
581
582 cancel_delayed_work(&info->work);
583 return 0;
584 }
585
ltc294x_resume(struct device * dev)586 static int ltc294x_resume(struct device *dev)
587 {
588 struct i2c_client *client = to_i2c_client(dev);
589 struct ltc294x_info *info = i2c_get_clientdata(client);
590
591 schedule_delayed_work(&info->work, LTC294X_WORK_DELAY * HZ);
592 return 0;
593 }
594
595 static SIMPLE_DEV_PM_OPS(ltc294x_pm_ops, ltc294x_suspend, ltc294x_resume);
596 #define LTC294X_PM_OPS (<c294x_pm_ops)
597
598 #else
599 #define LTC294X_PM_OPS NULL
600 #endif /* CONFIG_PM_SLEEP */
601
602
603 static const struct i2c_device_id ltc294x_i2c_id[] = {
604 { "ltc2941", LTC2941_ID, },
605 { "ltc2942", LTC2942_ID, },
606 { "ltc2943", LTC2943_ID, },
607 { "ltc2944", LTC2944_ID, },
608 { },
609 };
610 MODULE_DEVICE_TABLE(i2c, ltc294x_i2c_id);
611
612 static const struct of_device_id ltc294x_i2c_of_match[] = {
613 {
614 .compatible = "lltc,ltc2941",
615 .data = (void *)LTC2941_ID,
616 },
617 {
618 .compatible = "lltc,ltc2942",
619 .data = (void *)LTC2942_ID,
620 },
621 {
622 .compatible = "lltc,ltc2943",
623 .data = (void *)LTC2943_ID,
624 },
625 {
626 .compatible = "lltc,ltc2944",
627 .data = (void *)LTC2944_ID,
628 },
629 { },
630 };
631 MODULE_DEVICE_TABLE(of, ltc294x_i2c_of_match);
632
633 static struct i2c_driver ltc294x_driver = {
634 .driver = {
635 .name = "LTC2941",
636 .of_match_table = ltc294x_i2c_of_match,
637 .pm = LTC294X_PM_OPS,
638 },
639 .probe = ltc294x_i2c_probe,
640 .shutdown = ltc294x_i2c_shutdown,
641 .id_table = ltc294x_i2c_id,
642 };
643 module_i2c_driver(ltc294x_driver);
644
645 MODULE_AUTHOR("Auryn Verwegen, Topic Embedded Systems");
646 MODULE_AUTHOR("Mike Looijmans, Topic Embedded Products");
647 MODULE_DESCRIPTION("LTC2941/LTC2942/LTC2943/LTC2944 Battery Gas Gauge IC driver");
648 MODULE_LICENSE("GPL");
649