1 /*
2 * I2C client/driver for the Linear Technology LTC2941, LTC2942, LTC2943
3 * and LTC2944 Battery Gas Gauge IC
4 *
5 * Copyright (C) 2014 Topic Embedded Systems
6 *
7 * Author: Auryn Verwegen
8 * Author: Mike Looijmans
9 */
10 #include <linux/kernel.h>
11 #include <linux/module.h>
12 #include <linux/of_device.h>
13 #include <linux/types.h>
14 #include <linux/errno.h>
15 #include <linux/swab.h>
16 #include <linux/i2c.h>
17 #include <linux/delay.h>
18 #include <linux/power_supply.h>
19 #include <linux/slab.h>
20
21 #define I16_MSB(x) ((x >> 8) & 0xFF)
22 #define I16_LSB(x) (x & 0xFF)
23
24 #define LTC294X_WORK_DELAY 10 /* Update delay in seconds */
25
26 #define LTC294X_MAX_VALUE 0xFFFF
27 #define LTC294X_MID_SUPPLY 0x7FFF
28
29 #define LTC2941_MAX_PRESCALER_EXP 7
30 #define LTC2943_MAX_PRESCALER_EXP 6
31
32 enum ltc294x_reg {
33 LTC294X_REG_STATUS = 0x00,
34 LTC294X_REG_CONTROL = 0x01,
35 LTC294X_REG_ACC_CHARGE_MSB = 0x02,
36 LTC294X_REG_ACC_CHARGE_LSB = 0x03,
37 LTC294X_REG_CHARGE_THR_HIGH_MSB = 0x04,
38 LTC294X_REG_CHARGE_THR_HIGH_LSB = 0x05,
39 LTC294X_REG_CHARGE_THR_LOW_MSB = 0x06,
40 LTC294X_REG_CHARGE_THR_LOW_LSB = 0x07,
41 LTC294X_REG_VOLTAGE_MSB = 0x08,
42 LTC294X_REG_VOLTAGE_LSB = 0x09,
43 LTC2942_REG_TEMPERATURE_MSB = 0x0C,
44 LTC2942_REG_TEMPERATURE_LSB = 0x0D,
45 LTC2943_REG_CURRENT_MSB = 0x0E,
46 LTC2943_REG_CURRENT_LSB = 0x0F,
47 LTC2943_REG_TEMPERATURE_MSB = 0x14,
48 LTC2943_REG_TEMPERATURE_LSB = 0x15,
49 };
50
51 enum ltc294x_id {
52 LTC2941_ID,
53 LTC2942_ID,
54 LTC2943_ID,
55 LTC2944_ID,
56 };
57
58 #define LTC2941_REG_STATUS_CHIP_ID BIT(7)
59
60 #define LTC2942_REG_CONTROL_MODE_SCAN (BIT(7) | BIT(6))
61 #define LTC2943_REG_CONTROL_MODE_SCAN BIT(7)
62 #define LTC294X_REG_CONTROL_PRESCALER_MASK (BIT(5) | BIT(4) | BIT(3))
63 #define LTC294X_REG_CONTROL_SHUTDOWN_MASK (BIT(0))
64 #define LTC294X_REG_CONTROL_PRESCALER_SET(x) \
65 ((x << 3) & LTC294X_REG_CONTROL_PRESCALER_MASK)
66 #define LTC294X_REG_CONTROL_ALCC_CONFIG_DISABLED 0
67 #define LTC294X_REG_CONTROL_ADC_DISABLE(x) ((x) & ~(BIT(7) | BIT(6)))
68
69 struct ltc294x_info {
70 struct i2c_client *client; /* I2C Client pointer */
71 struct power_supply *supply; /* Supply pointer */
72 struct power_supply_desc supply_desc; /* Supply description */
73 struct delayed_work work; /* Work scheduler */
74 enum ltc294x_id id; /* Chip type */
75 int charge; /* Last charge register content */
76 int r_sense; /* mOhm */
77 int Qlsb; /* nAh */
78 };
79
convert_bin_to_uAh(const struct ltc294x_info * info,int Q)80 static inline int convert_bin_to_uAh(
81 const struct ltc294x_info *info, int Q)
82 {
83 return ((Q * (info->Qlsb / 10))) / 100;
84 }
85
convert_uAh_to_bin(const struct ltc294x_info * info,int uAh)86 static inline int convert_uAh_to_bin(
87 const struct ltc294x_info *info, int uAh)
88 {
89 int Q;
90
91 Q = (uAh * 100) / (info->Qlsb/10);
92 return (Q < LTC294X_MAX_VALUE) ? Q : LTC294X_MAX_VALUE;
93 }
94
ltc294x_read_regs(struct i2c_client * client,enum ltc294x_reg reg,u8 * buf,int num_regs)95 static int ltc294x_read_regs(struct i2c_client *client,
96 enum ltc294x_reg reg, u8 *buf, int num_regs)
97 {
98 int ret;
99 struct i2c_msg msgs[2] = { };
100 u8 reg_start = reg;
101
102 msgs[0].addr = client->addr;
103 msgs[0].len = 1;
104 msgs[0].buf = ®_start;
105
106 msgs[1].addr = client->addr;
107 msgs[1].len = num_regs;
108 msgs[1].buf = buf;
109 msgs[1].flags = I2C_M_RD;
110
111 ret = i2c_transfer(client->adapter, &msgs[0], 2);
112 if (ret < 0) {
113 dev_err(&client->dev, "ltc2941 read_reg failed!\n");
114 return ret;
115 }
116
117 dev_dbg(&client->dev, "%s (%#x, %d) -> %#x\n",
118 __func__, reg, num_regs, *buf);
119
120 return 0;
121 }
122
ltc294x_write_regs(struct i2c_client * client,enum ltc294x_reg reg,const u8 * buf,int num_regs)123 static int ltc294x_write_regs(struct i2c_client *client,
124 enum ltc294x_reg reg, const u8 *buf, int num_regs)
125 {
126 int ret;
127 u8 reg_start = reg;
128
129 ret = i2c_smbus_write_i2c_block_data(client, reg_start, num_regs, buf);
130 if (ret < 0) {
131 dev_err(&client->dev, "ltc2941 write_reg failed!\n");
132 return ret;
133 }
134
135 dev_dbg(&client->dev, "%s (%#x, %d) -> %#x\n",
136 __func__, reg, num_regs, *buf);
137
138 return 0;
139 }
140
ltc294x_reset(const struct ltc294x_info * info,int prescaler_exp)141 static int ltc294x_reset(const struct ltc294x_info *info, int prescaler_exp)
142 {
143 int ret;
144 u8 value;
145 u8 control;
146
147 /* Read status and control registers */
148 ret = ltc294x_read_regs(info->client, LTC294X_REG_CONTROL, &value, 1);
149 if (ret < 0) {
150 dev_err(&info->client->dev,
151 "Could not read registers from device\n");
152 goto error_exit;
153 }
154
155 control = LTC294X_REG_CONTROL_PRESCALER_SET(prescaler_exp) |
156 LTC294X_REG_CONTROL_ALCC_CONFIG_DISABLED;
157 /* Put device into "monitor" mode */
158 switch (info->id) {
159 case LTC2942_ID: /* 2942 measures every 2 sec */
160 control |= LTC2942_REG_CONTROL_MODE_SCAN;
161 break;
162 case LTC2943_ID:
163 case LTC2944_ID: /* 2943 and 2944 measure every 10 sec */
164 control |= LTC2943_REG_CONTROL_MODE_SCAN;
165 break;
166 default:
167 break;
168 }
169
170 if (value != control) {
171 ret = ltc294x_write_regs(info->client,
172 LTC294X_REG_CONTROL, &control, 1);
173 if (ret < 0) {
174 dev_err(&info->client->dev,
175 "Could not write register\n");
176 goto error_exit;
177 }
178 }
179
180 return 0;
181
182 error_exit:
183 return ret;
184 }
185
ltc294x_read_charge_register(const struct ltc294x_info * info,enum ltc294x_reg reg)186 static int ltc294x_read_charge_register(const struct ltc294x_info *info,
187 enum ltc294x_reg reg)
188 {
189 int ret;
190 u8 datar[2];
191
192 ret = ltc294x_read_regs(info->client, reg, &datar[0], 2);
193 if (ret < 0)
194 return ret;
195 return (datar[0] << 8) + datar[1];
196 }
197
ltc294x_get_charge(const struct ltc294x_info * info,enum ltc294x_reg reg,int * val)198 static int ltc294x_get_charge(const struct ltc294x_info *info,
199 enum ltc294x_reg reg, int *val)
200 {
201 int value = ltc294x_read_charge_register(info, reg);
202
203 if (value < 0)
204 return value;
205 /* When r_sense < 0, this counts up when the battery discharges */
206 if (info->Qlsb < 0)
207 value -= 0xFFFF;
208 *val = convert_bin_to_uAh(info, value);
209 return 0;
210 }
211
ltc294x_set_charge_now(const struct ltc294x_info * info,int val)212 static int ltc294x_set_charge_now(const struct ltc294x_info *info, int val)
213 {
214 int ret;
215 u8 dataw[2];
216 u8 ctrl_reg;
217 s32 value;
218
219 value = convert_uAh_to_bin(info, val);
220 /* Direction depends on how sense+/- were connected */
221 if (info->Qlsb < 0)
222 value += 0xFFFF;
223 if ((value < 0) || (value > 0xFFFF)) /* input validation */
224 return -EINVAL;
225
226 /* Read control register */
227 ret = ltc294x_read_regs(info->client,
228 LTC294X_REG_CONTROL, &ctrl_reg, 1);
229 if (ret < 0)
230 return ret;
231 /* Disable analog section */
232 ctrl_reg |= LTC294X_REG_CONTROL_SHUTDOWN_MASK;
233 ret = ltc294x_write_regs(info->client,
234 LTC294X_REG_CONTROL, &ctrl_reg, 1);
235 if (ret < 0)
236 return ret;
237 /* Set new charge value */
238 dataw[0] = I16_MSB(value);
239 dataw[1] = I16_LSB(value);
240 ret = ltc294x_write_regs(info->client,
241 LTC294X_REG_ACC_CHARGE_MSB, &dataw[0], 2);
242 if (ret < 0)
243 goto error_exit;
244 /* Enable analog section */
245 error_exit:
246 ctrl_reg &= ~LTC294X_REG_CONTROL_SHUTDOWN_MASK;
247 ret = ltc294x_write_regs(info->client,
248 LTC294X_REG_CONTROL, &ctrl_reg, 1);
249
250 return ret < 0 ? ret : 0;
251 }
252
ltc294x_set_charge_thr(const struct ltc294x_info * info,enum ltc294x_reg reg,int val)253 static int ltc294x_set_charge_thr(const struct ltc294x_info *info,
254 enum ltc294x_reg reg, int val)
255 {
256 u8 dataw[2];
257 s32 value;
258
259 value = convert_uAh_to_bin(info, val);
260 /* Direction depends on how sense+/- were connected */
261 if (info->Qlsb < 0)
262 value += 0xFFFF;
263 if ((value < 0) || (value > 0xFFFF)) /* input validation */
264 return -EINVAL;
265
266 /* Set new charge value */
267 dataw[0] = I16_MSB(value);
268 dataw[1] = I16_LSB(value);
269 return ltc294x_write_regs(info->client, reg, &dataw[0], 2);
270 }
271
ltc294x_get_charge_counter(const struct ltc294x_info * info,int * val)272 static int ltc294x_get_charge_counter(
273 const struct ltc294x_info *info, int *val)
274 {
275 int value = ltc294x_read_charge_register(info, LTC294X_REG_ACC_CHARGE_MSB);
276
277 if (value < 0)
278 return value;
279 value -= LTC294X_MID_SUPPLY;
280 *val = convert_bin_to_uAh(info, value);
281 return 0;
282 }
283
ltc294x_get_voltage(const struct ltc294x_info * info,int * val)284 static int ltc294x_get_voltage(const struct ltc294x_info *info, int *val)
285 {
286 int ret;
287 u8 datar[2];
288 u32 value;
289
290 ret = ltc294x_read_regs(info->client,
291 LTC294X_REG_VOLTAGE_MSB, &datar[0], 2);
292 value = (datar[0] << 8) | datar[1];
293 switch (info->id) {
294 case LTC2943_ID:
295 value *= 23600 * 2;
296 value /= 0xFFFF;
297 value *= 1000 / 2;
298 break;
299 case LTC2944_ID:
300 value *= 70800 / 5*4;
301 value /= 0xFFFF;
302 value *= 1000 * 5/4;
303 break;
304 default:
305 value *= 6000 * 10;
306 value /= 0xFFFF;
307 value *= 1000 / 10;
308 break;
309 }
310 *val = value;
311 return ret;
312 }
313
ltc294x_get_current(const struct ltc294x_info * info,int * val)314 static int ltc294x_get_current(const struct ltc294x_info *info, int *val)
315 {
316 int ret;
317 u8 datar[2];
318 s32 value;
319
320 ret = ltc294x_read_regs(info->client,
321 LTC2943_REG_CURRENT_MSB, &datar[0], 2);
322 value = (datar[0] << 8) | datar[1];
323 value -= 0x7FFF;
324 if (info->id == LTC2944_ID)
325 value *= 64000;
326 else
327 value *= 60000;
328 /* Value is in range -32k..+32k, r_sense is usually 10..50 mOhm,
329 * the formula below keeps everything in s32 range while preserving
330 * enough digits */
331 *val = 1000 * (value / (info->r_sense * 0x7FFF)); /* in uA */
332 return ret;
333 }
334
ltc294x_get_temperature(const struct ltc294x_info * info,int * val)335 static int ltc294x_get_temperature(const struct ltc294x_info *info, int *val)
336 {
337 enum ltc294x_reg reg;
338 int ret;
339 u8 datar[2];
340 u32 value;
341
342 if (info->id == LTC2942_ID) {
343 reg = LTC2942_REG_TEMPERATURE_MSB;
344 value = 6000; /* Full-scale is 600 Kelvin */
345 } else {
346 reg = LTC2943_REG_TEMPERATURE_MSB;
347 value = 5100; /* Full-scale is 510 Kelvin */
348 }
349 ret = ltc294x_read_regs(info->client, reg, &datar[0], 2);
350 value *= (datar[0] << 8) | datar[1];
351 /* Convert to tenths of degree Celsius */
352 *val = value / 0xFFFF - 2722;
353 return ret;
354 }
355
ltc294x_get_property(struct power_supply * psy,enum power_supply_property prop,union power_supply_propval * val)356 static int ltc294x_get_property(struct power_supply *psy,
357 enum power_supply_property prop,
358 union power_supply_propval *val)
359 {
360 struct ltc294x_info *info = power_supply_get_drvdata(psy);
361
362 switch (prop) {
363 case POWER_SUPPLY_PROP_CHARGE_FULL:
364 return ltc294x_get_charge(info, LTC294X_REG_CHARGE_THR_HIGH_MSB,
365 &val->intval);
366 case POWER_SUPPLY_PROP_CHARGE_EMPTY:
367 return ltc294x_get_charge(info, LTC294X_REG_CHARGE_THR_LOW_MSB,
368 &val->intval);
369 case POWER_SUPPLY_PROP_CHARGE_NOW:
370 return ltc294x_get_charge(info, LTC294X_REG_ACC_CHARGE_MSB,
371 &val->intval);
372 case POWER_SUPPLY_PROP_CHARGE_COUNTER:
373 return ltc294x_get_charge_counter(info, &val->intval);
374 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
375 return ltc294x_get_voltage(info, &val->intval);
376 case POWER_SUPPLY_PROP_CURRENT_NOW:
377 return ltc294x_get_current(info, &val->intval);
378 case POWER_SUPPLY_PROP_TEMP:
379 return ltc294x_get_temperature(info, &val->intval);
380 default:
381 return -EINVAL;
382 }
383 }
384
ltc294x_set_property(struct power_supply * psy,enum power_supply_property psp,const union power_supply_propval * val)385 static int ltc294x_set_property(struct power_supply *psy,
386 enum power_supply_property psp,
387 const union power_supply_propval *val)
388 {
389 struct ltc294x_info *info = power_supply_get_drvdata(psy);
390
391 switch (psp) {
392 case POWER_SUPPLY_PROP_CHARGE_FULL:
393 return ltc294x_set_charge_thr(info,
394 LTC294X_REG_CHARGE_THR_HIGH_MSB, val->intval);
395 case POWER_SUPPLY_PROP_CHARGE_EMPTY:
396 return ltc294x_set_charge_thr(info,
397 LTC294X_REG_CHARGE_THR_LOW_MSB, val->intval);
398 case POWER_SUPPLY_PROP_CHARGE_NOW:
399 return ltc294x_set_charge_now(info, val->intval);
400 default:
401 return -EPERM;
402 }
403 }
404
ltc294x_property_is_writeable(struct power_supply * psy,enum power_supply_property psp)405 static int ltc294x_property_is_writeable(
406 struct power_supply *psy, enum power_supply_property psp)
407 {
408 switch (psp) {
409 case POWER_SUPPLY_PROP_CHARGE_FULL:
410 case POWER_SUPPLY_PROP_CHARGE_EMPTY:
411 case POWER_SUPPLY_PROP_CHARGE_NOW:
412 return 1;
413 default:
414 return 0;
415 }
416 }
417
ltc294x_update(struct ltc294x_info * info)418 static void ltc294x_update(struct ltc294x_info *info)
419 {
420 int charge = ltc294x_read_charge_register(info, LTC294X_REG_ACC_CHARGE_MSB);
421
422 if (charge != info->charge) {
423 info->charge = charge;
424 power_supply_changed(info->supply);
425 }
426 }
427
ltc294x_work(struct work_struct * work)428 static void ltc294x_work(struct work_struct *work)
429 {
430 struct ltc294x_info *info;
431
432 info = container_of(work, struct ltc294x_info, work.work);
433 ltc294x_update(info);
434 schedule_delayed_work(&info->work, LTC294X_WORK_DELAY * HZ);
435 }
436
437 static enum power_supply_property ltc294x_properties[] = {
438 POWER_SUPPLY_PROP_CHARGE_COUNTER,
439 POWER_SUPPLY_PROP_CHARGE_FULL,
440 POWER_SUPPLY_PROP_CHARGE_EMPTY,
441 POWER_SUPPLY_PROP_CHARGE_NOW,
442 POWER_SUPPLY_PROP_VOLTAGE_NOW,
443 POWER_SUPPLY_PROP_TEMP,
444 POWER_SUPPLY_PROP_CURRENT_NOW,
445 };
446
ltc294x_i2c_remove(struct i2c_client * client)447 static int ltc294x_i2c_remove(struct i2c_client *client)
448 {
449 struct ltc294x_info *info = i2c_get_clientdata(client);
450
451 cancel_delayed_work_sync(&info->work);
452 power_supply_unregister(info->supply);
453 return 0;
454 }
455
ltc294x_i2c_probe(struct i2c_client * client,const struct i2c_device_id * id)456 static int ltc294x_i2c_probe(struct i2c_client *client,
457 const struct i2c_device_id *id)
458 {
459 struct power_supply_config psy_cfg = {};
460 struct ltc294x_info *info;
461 struct device_node *np;
462 int ret;
463 u32 prescaler_exp;
464 s32 r_sense;
465 u8 status;
466
467 info = devm_kzalloc(&client->dev, sizeof(*info), GFP_KERNEL);
468 if (info == NULL)
469 return -ENOMEM;
470
471 i2c_set_clientdata(client, info);
472
473 np = of_node_get(client->dev.of_node);
474
475 info->id = (enum ltc294x_id)of_device_get_match_data(&client->dev);
476 info->supply_desc.name = np->name;
477
478 /* r_sense can be negative, when sense+ is connected to the battery
479 * instead of the sense-. This results in reversed measurements. */
480 ret = of_property_read_u32(np, "lltc,resistor-sense", &r_sense);
481 if (ret < 0) {
482 dev_err(&client->dev,
483 "Could not find lltc,resistor-sense in devicetree\n");
484 return ret;
485 }
486 info->r_sense = r_sense;
487
488 ret = of_property_read_u32(np, "lltc,prescaler-exponent",
489 &prescaler_exp);
490 if (ret < 0) {
491 dev_warn(&client->dev,
492 "lltc,prescaler-exponent not in devicetree\n");
493 prescaler_exp = LTC2941_MAX_PRESCALER_EXP;
494 }
495
496 if (info->id == LTC2943_ID) {
497 if (prescaler_exp > LTC2943_MAX_PRESCALER_EXP)
498 prescaler_exp = LTC2943_MAX_PRESCALER_EXP;
499 info->Qlsb = ((340 * 50000) / r_sense) /
500 (4096 / (1 << (2*prescaler_exp)));
501 } else {
502 if (prescaler_exp > LTC2941_MAX_PRESCALER_EXP)
503 prescaler_exp = LTC2941_MAX_PRESCALER_EXP;
504 info->Qlsb = ((85 * 50000) / r_sense) /
505 (128 / (1 << prescaler_exp));
506 }
507
508 /* Read status register to check for LTC2942 */
509 if (info->id == LTC2941_ID || info->id == LTC2942_ID) {
510 ret = ltc294x_read_regs(client, LTC294X_REG_STATUS, &status, 1);
511 if (ret < 0) {
512 dev_err(&client->dev,
513 "Could not read status register\n");
514 return ret;
515 }
516 if (status & LTC2941_REG_STATUS_CHIP_ID)
517 info->id = LTC2941_ID;
518 else
519 info->id = LTC2942_ID;
520 }
521
522 info->client = client;
523 info->supply_desc.type = POWER_SUPPLY_TYPE_BATTERY;
524 info->supply_desc.properties = ltc294x_properties;
525 switch (info->id) {
526 case LTC2944_ID:
527 case LTC2943_ID:
528 info->supply_desc.num_properties =
529 ARRAY_SIZE(ltc294x_properties);
530 break;
531 case LTC2942_ID:
532 info->supply_desc.num_properties =
533 ARRAY_SIZE(ltc294x_properties) - 1;
534 break;
535 case LTC2941_ID:
536 default:
537 info->supply_desc.num_properties =
538 ARRAY_SIZE(ltc294x_properties) - 3;
539 break;
540 }
541 info->supply_desc.get_property = ltc294x_get_property;
542 info->supply_desc.set_property = ltc294x_set_property;
543 info->supply_desc.property_is_writeable = ltc294x_property_is_writeable;
544 info->supply_desc.external_power_changed = NULL;
545
546 psy_cfg.drv_data = info;
547
548 INIT_DELAYED_WORK(&info->work, ltc294x_work);
549
550 ret = ltc294x_reset(info, prescaler_exp);
551 if (ret < 0) {
552 dev_err(&client->dev, "Communication with chip failed\n");
553 return ret;
554 }
555
556 info->supply = power_supply_register(&client->dev, &info->supply_desc,
557 &psy_cfg);
558 if (IS_ERR(info->supply)) {
559 dev_err(&client->dev, "failed to register ltc2941\n");
560 return PTR_ERR(info->supply);
561 } else {
562 schedule_delayed_work(&info->work, LTC294X_WORK_DELAY * HZ);
563 }
564
565 return 0;
566 }
567
ltc294x_i2c_shutdown(struct i2c_client * client)568 static void ltc294x_i2c_shutdown(struct i2c_client *client)
569 {
570 struct ltc294x_info *info = i2c_get_clientdata(client);
571 int ret;
572 u8 value;
573 u8 control;
574
575 /* The LTC2941 does not need any special handling */
576 if (info->id == LTC2941_ID)
577 return;
578
579 /* Read control register */
580 ret = ltc294x_read_regs(info->client, LTC294X_REG_CONTROL, &value, 1);
581 if (ret < 0)
582 return;
583
584 /* Disable continuous ADC conversion as this drains the battery */
585 control = LTC294X_REG_CONTROL_ADC_DISABLE(value);
586 if (control != value)
587 ltc294x_write_regs(info->client, LTC294X_REG_CONTROL,
588 &control, 1);
589 }
590
591 #ifdef CONFIG_PM_SLEEP
592
ltc294x_suspend(struct device * dev)593 static int ltc294x_suspend(struct device *dev)
594 {
595 struct i2c_client *client = to_i2c_client(dev);
596 struct ltc294x_info *info = i2c_get_clientdata(client);
597
598 cancel_delayed_work(&info->work);
599 return 0;
600 }
601
ltc294x_resume(struct device * dev)602 static int ltc294x_resume(struct device *dev)
603 {
604 struct i2c_client *client = to_i2c_client(dev);
605 struct ltc294x_info *info = i2c_get_clientdata(client);
606
607 schedule_delayed_work(&info->work, LTC294X_WORK_DELAY * HZ);
608 return 0;
609 }
610
611 static SIMPLE_DEV_PM_OPS(ltc294x_pm_ops, ltc294x_suspend, ltc294x_resume);
612 #define LTC294X_PM_OPS (<c294x_pm_ops)
613
614 #else
615 #define LTC294X_PM_OPS NULL
616 #endif /* CONFIG_PM_SLEEP */
617
618
619 static const struct i2c_device_id ltc294x_i2c_id[] = {
620 { "ltc2941", LTC2941_ID, },
621 { "ltc2942", LTC2942_ID, },
622 { "ltc2943", LTC2943_ID, },
623 { "ltc2944", LTC2944_ID, },
624 { },
625 };
626 MODULE_DEVICE_TABLE(i2c, ltc294x_i2c_id);
627
628 static const struct of_device_id ltc294x_i2c_of_match[] = {
629 {
630 .compatible = "lltc,ltc2941",
631 .data = (void *)LTC2941_ID,
632 },
633 {
634 .compatible = "lltc,ltc2942",
635 .data = (void *)LTC2942_ID,
636 },
637 {
638 .compatible = "lltc,ltc2943",
639 .data = (void *)LTC2943_ID,
640 },
641 {
642 .compatible = "lltc,ltc2944",
643 .data = (void *)LTC2944_ID,
644 },
645 { },
646 };
647 MODULE_DEVICE_TABLE(of, ltc294x_i2c_of_match);
648
649 static struct i2c_driver ltc294x_driver = {
650 .driver = {
651 .name = "LTC2941",
652 .of_match_table = ltc294x_i2c_of_match,
653 .pm = LTC294X_PM_OPS,
654 },
655 .probe = ltc294x_i2c_probe,
656 .remove = ltc294x_i2c_remove,
657 .shutdown = ltc294x_i2c_shutdown,
658 .id_table = ltc294x_i2c_id,
659 };
660 module_i2c_driver(ltc294x_driver);
661
662 MODULE_AUTHOR("Auryn Verwegen, Topic Embedded Systems");
663 MODULE_AUTHOR("Mike Looijmans, Topic Embedded Products");
664 MODULE_DESCRIPTION("LTC2941/LTC2942/LTC2943/LTC2944 Battery Gas Gauge IC driver");
665 MODULE_LICENSE("GPL");
666