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WIP FPC-III support
[linux/fpc-iii.git] / drivers / power / supply / sbs-battery.c
blobb6a538ebb378fcde62a42b9d76ac78555af8450f
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Gas Gauge driver for SBS Compliant Batteries
4 *
5 * Copyright (c) 2010, NVIDIA Corporation.
6 */
7
8 #include <linux/bits.h>
9 #include <linux/delay.h>
10 #include <linux/err.h>
11 #include <linux/gpio/consumer.h>
12 #include <linux/i2c.h>
13 #include <linux/init.h>
14 #include <linux/interrupt.h>
15 #include <linux/kernel.h>
16 #include <linux/module.h>
17 #include <linux/property.h>
18 #include <linux/of_device.h>
19 #include <linux/power/sbs-battery.h>
20 #include <linux/power_supply.h>
21 #include <linux/slab.h>
22 #include <linux/stat.h>
23
24 enum {
25 REG_MANUFACTURER_DATA,
26 REG_BATTERY_MODE,
27 REG_TEMPERATURE,
28 REG_VOLTAGE,
29 REG_CURRENT_NOW,
30 REG_CURRENT_AVG,
31 REG_MAX_ERR,
32 REG_CAPACITY,
33 REG_TIME_TO_EMPTY,
34 REG_TIME_TO_FULL,
35 REG_STATUS,
36 REG_CAPACITY_LEVEL,
37 REG_CYCLE_COUNT,
38 REG_SERIAL_NUMBER,
39 REG_REMAINING_CAPACITY,
40 REG_REMAINING_CAPACITY_CHARGE,
41 REG_FULL_CHARGE_CAPACITY,
42 REG_FULL_CHARGE_CAPACITY_CHARGE,
43 REG_DESIGN_CAPACITY,
44 REG_DESIGN_CAPACITY_CHARGE,
45 REG_DESIGN_VOLTAGE_MIN,
46 REG_DESIGN_VOLTAGE_MAX,
47 REG_CHEMISTRY,
48 REG_MANUFACTURER,
49 REG_MODEL_NAME,
50 REG_CHARGE_CURRENT,
51 REG_CHARGE_VOLTAGE,
52 };
53
54 #define REG_ADDR_SPEC_INFO 0x1A
55 #define SPEC_INFO_VERSION_MASK GENMASK(7, 4)
56 #define SPEC_INFO_VERSION_SHIFT 4
57
58 #define SBS_VERSION_1_0 1
59 #define SBS_VERSION_1_1 2
60 #define SBS_VERSION_1_1_WITH_PEC 3
61
62 #define REG_ADDR_MANUFACTURE_DATE 0x1B
63
64 /* Battery Mode defines */
65 #define BATTERY_MODE_OFFSET 0x03
66 #define BATTERY_MODE_CAPACITY_MASK BIT(15)
67 enum sbs_capacity_mode {
68 CAPACITY_MODE_AMPS = 0,
69 CAPACITY_MODE_WATTS = BATTERY_MODE_CAPACITY_MASK
70 };
71 #define BATTERY_MODE_CHARGER_MASK (1<<14)
72
73 /* manufacturer access defines */
74 #define MANUFACTURER_ACCESS_STATUS 0x0006
75 #define MANUFACTURER_ACCESS_SLEEP 0x0011
76
77 /* battery status value bits */
78 #define BATTERY_INITIALIZED 0x80
79 #define BATTERY_DISCHARGING 0x40
80 #define BATTERY_FULL_CHARGED 0x20
81 #define BATTERY_FULL_DISCHARGED 0x10
82
83 /* min_value and max_value are only valid for numerical data */
84 #define SBS_DATA(_psp, _addr, _min_value, _max_value) { \
85 .psp = _psp, \
86 .addr = _addr, \
87 .min_value = _min_value, \
88 .max_value = _max_value, \
89 }
90
91 static const struct chip_data {
92 enum power_supply_property psp;
93 u8 addr;
94 int min_value;
95 int max_value;
96 } sbs_data[] = {
97 [REG_MANUFACTURER_DATA] =
98 SBS_DATA(POWER_SUPPLY_PROP_PRESENT, 0x00, 0, 65535),
99 [REG_BATTERY_MODE] =
100 SBS_DATA(-1, 0x03, 0, 65535),
101 [REG_TEMPERATURE] =
102 SBS_DATA(POWER_SUPPLY_PROP_TEMP, 0x08, 0, 65535),
103 [REG_VOLTAGE] =
104 SBS_DATA(POWER_SUPPLY_PROP_VOLTAGE_NOW, 0x09, 0, 20000),
105 [REG_CURRENT_NOW] =
106 SBS_DATA(POWER_SUPPLY_PROP_CURRENT_NOW, 0x0A, -32768, 32767),
107 [REG_CURRENT_AVG] =
108 SBS_DATA(POWER_SUPPLY_PROP_CURRENT_AVG, 0x0B, -32768, 32767),
109 [REG_MAX_ERR] =
110 SBS_DATA(POWER_SUPPLY_PROP_CAPACITY_ERROR_MARGIN, 0x0c, 0, 100),
111 [REG_CAPACITY] =
112 SBS_DATA(POWER_SUPPLY_PROP_CAPACITY, 0x0D, 0, 100),
113 [REG_REMAINING_CAPACITY] =
114 SBS_DATA(POWER_SUPPLY_PROP_ENERGY_NOW, 0x0F, 0, 65535),
115 [REG_REMAINING_CAPACITY_CHARGE] =
116 SBS_DATA(POWER_SUPPLY_PROP_CHARGE_NOW, 0x0F, 0, 65535),
117 [REG_FULL_CHARGE_CAPACITY] =
118 SBS_DATA(POWER_SUPPLY_PROP_ENERGY_FULL, 0x10, 0, 65535),
119 [REG_FULL_CHARGE_CAPACITY_CHARGE] =
120 SBS_DATA(POWER_SUPPLY_PROP_CHARGE_FULL, 0x10, 0, 65535),
121 [REG_TIME_TO_EMPTY] =
122 SBS_DATA(POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG, 0x12, 0, 65535),
123 [REG_TIME_TO_FULL] =
124 SBS_DATA(POWER_SUPPLY_PROP_TIME_TO_FULL_AVG, 0x13, 0, 65535),
125 [REG_CHARGE_CURRENT] =
126 SBS_DATA(POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX, 0x14, 0, 65535),
127 [REG_CHARGE_VOLTAGE] =
128 SBS_DATA(POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX, 0x15, 0, 65535),
129 [REG_STATUS] =
130 SBS_DATA(POWER_SUPPLY_PROP_STATUS, 0x16, 0, 65535),
131 [REG_CAPACITY_LEVEL] =
132 SBS_DATA(POWER_SUPPLY_PROP_CAPACITY_LEVEL, 0x16, 0, 65535),
133 [REG_CYCLE_COUNT] =
134 SBS_DATA(POWER_SUPPLY_PROP_CYCLE_COUNT, 0x17, 0, 65535),
135 [REG_DESIGN_CAPACITY] =
136 SBS_DATA(POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN, 0x18, 0, 65535),
137 [REG_DESIGN_CAPACITY_CHARGE] =
138 SBS_DATA(POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, 0x18, 0, 65535),
139 [REG_DESIGN_VOLTAGE_MIN] =
140 SBS_DATA(POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, 0x19, 0, 65535),
141 [REG_DESIGN_VOLTAGE_MAX] =
142 SBS_DATA(POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN, 0x19, 0, 65535),
143 [REG_SERIAL_NUMBER] =
144 SBS_DATA(POWER_SUPPLY_PROP_SERIAL_NUMBER, 0x1C, 0, 65535),
145 /* Properties of type `const char *' */
146 [REG_MANUFACTURER] =
147 SBS_DATA(POWER_SUPPLY_PROP_MANUFACTURER, 0x20, 0, 65535),
148 [REG_MODEL_NAME] =
149 SBS_DATA(POWER_SUPPLY_PROP_MODEL_NAME, 0x21, 0, 65535),
150 [REG_CHEMISTRY] =
151 SBS_DATA(POWER_SUPPLY_PROP_TECHNOLOGY, 0x22, 0, 65535)
152 };
153
154 static const enum power_supply_property sbs_properties[] = {
155 POWER_SUPPLY_PROP_STATUS,
156 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
157 POWER_SUPPLY_PROP_HEALTH,
158 POWER_SUPPLY_PROP_PRESENT,
159 POWER_SUPPLY_PROP_TECHNOLOGY,
160 POWER_SUPPLY_PROP_CYCLE_COUNT,
161 POWER_SUPPLY_PROP_VOLTAGE_NOW,
162 POWER_SUPPLY_PROP_CURRENT_NOW,
163 POWER_SUPPLY_PROP_CURRENT_AVG,
164 POWER_SUPPLY_PROP_CAPACITY,
165 POWER_SUPPLY_PROP_CAPACITY_ERROR_MARGIN,
166 POWER_SUPPLY_PROP_TEMP,
167 POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
168 POWER_SUPPLY_PROP_TIME_TO_FULL_AVG,
169 POWER_SUPPLY_PROP_SERIAL_NUMBER,
170 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
171 POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
172 POWER_SUPPLY_PROP_ENERGY_NOW,
173 POWER_SUPPLY_PROP_ENERGY_FULL,
174 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
175 POWER_SUPPLY_PROP_CHARGE_NOW,
176 POWER_SUPPLY_PROP_CHARGE_FULL,
177 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
178 POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX,
179 POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX,
180 POWER_SUPPLY_PROP_MANUFACTURE_YEAR,
181 POWER_SUPPLY_PROP_MANUFACTURE_MONTH,
182 POWER_SUPPLY_PROP_MANUFACTURE_DAY,
183 /* Properties of type `const char *' */
184 POWER_SUPPLY_PROP_MANUFACTURER,
185 POWER_SUPPLY_PROP_MODEL_NAME
186 };
187
188 /* Supports special manufacturer commands from TI BQ20Z65 and BQ20Z75 IC. */
189 #define SBS_FLAGS_TI_BQ20ZX5 BIT(0)
190
191 struct sbs_info {
192 struct i2c_client *client;
193 struct power_supply *power_supply;
194 bool is_present;
195 struct gpio_desc *gpio_detect;
196 bool charger_broadcasts;
197 int last_state;
198 int poll_time;
199 u32 i2c_retry_count;
200 u32 poll_retry_count;
201 struct delayed_work work;
202 struct mutex mode_lock;
203 u32 flags;
204 };
205
206 static char model_name[I2C_SMBUS_BLOCK_MAX + 1];
207 static char manufacturer[I2C_SMBUS_BLOCK_MAX + 1];
208 static char chemistry[I2C_SMBUS_BLOCK_MAX + 1];
209 static bool force_load;
210
211 static int sbs_read_word_data(struct i2c_client *client, u8 address);
212 static int sbs_write_word_data(struct i2c_client *client, u8 address, u16 value);
213
214 static void sbs_disable_charger_broadcasts(struct sbs_info *chip)
215 {
216 int val = sbs_read_word_data(chip->client, BATTERY_MODE_OFFSET);
217 if (val < 0)
218 goto exit;
219
220 val |= BATTERY_MODE_CHARGER_MASK;
221
222 val = sbs_write_word_data(chip->client, BATTERY_MODE_OFFSET, val);
223
224 exit:
225 if (val < 0)
226 dev_err(&chip->client->dev,
227 "Failed to disable charger broadcasting: %d\n", val);
228 else
229 dev_dbg(&chip->client->dev, "%s\n", __func__);
230 }
231
232 static int sbs_update_presence(struct sbs_info *chip, bool is_present)
233 {
234 struct i2c_client *client = chip->client;
235 int retries = chip->i2c_retry_count;
236 s32 ret = 0;
237 u8 version;
238
239 if (chip->is_present == is_present)
240 return 0;
241
242 if (!is_present) {
243 chip->is_present = false;
244 /* Disable PEC when no device is present */
245 client->flags &= ~I2C_CLIENT_PEC;
246 return 0;
247 }
248
249 /* Check if device supports packet error checking and use it */
250 while (retries > 0) {
251 ret = i2c_smbus_read_word_data(client, REG_ADDR_SPEC_INFO);
252 if (ret >= 0)
253 break;
254
255 /*
256 * Some batteries trigger the detection pin before the
257 * I2C bus is properly connected. This works around the
258 * issue.
259 */
260 msleep(100);
261
262 retries--;
263 }
264
265 if (ret < 0) {
266 dev_dbg(&client->dev, "failed to read spec info: %d\n", ret);
267
268 /* fallback to old behaviour */
269 client->flags &= ~I2C_CLIENT_PEC;
270 chip->is_present = true;
271
272 return ret;
273 }
274
275 version = (ret & SPEC_INFO_VERSION_MASK) >> SPEC_INFO_VERSION_SHIFT;
276
277 if (version == SBS_VERSION_1_1_WITH_PEC)
278 client->flags |= I2C_CLIENT_PEC;
279 else
280 client->flags &= ~I2C_CLIENT_PEC;
281
282 if (of_device_is_compatible(client->dev.parent->of_node, "google,cros-ec-i2c-tunnel")
283 && client->flags & I2C_CLIENT_PEC) {
284 dev_info(&client->dev, "Disabling PEC because of broken Cros-EC implementation\n");
285 client->flags &= ~I2C_CLIENT_PEC;
286 }
287
288 dev_dbg(&client->dev, "PEC: %s\n", (client->flags & I2C_CLIENT_PEC) ?
289 "enabled" : "disabled");
290
291 if (!chip->is_present && is_present && !chip->charger_broadcasts)
292 sbs_disable_charger_broadcasts(chip);
293
294 chip->is_present = true;
295
296 return 0;
297 }
298
299 static int sbs_read_word_data(struct i2c_client *client, u8 address)
300 {
301 struct sbs_info *chip = i2c_get_clientdata(client);
302 int retries = chip->i2c_retry_count;
303 s32 ret = 0;
304
305 while (retries > 0) {
306 ret = i2c_smbus_read_word_data(client, address);
307 if (ret >= 0)
308 break;
309 retries--;
310 }
311
312 if (ret < 0) {
313 dev_dbg(&client->dev,
314 "%s: i2c read at address 0x%x failed\n",
315 __func__, address);
316 return ret;
317 }
318
319 return ret;
320 }
321
322 static int sbs_read_string_data_fallback(struct i2c_client *client, u8 address, char *values)
323 {
324 struct sbs_info *chip = i2c_get_clientdata(client);
325 s32 ret = 0, block_length = 0;
326 int retries_length, retries_block;
327 u8 block_buffer[I2C_SMBUS_BLOCK_MAX + 1];
328
329 retries_length = chip->i2c_retry_count;
330 retries_block = chip->i2c_retry_count;
331
332 dev_warn_once(&client->dev, "I2C adapter does not support I2C_FUNC_SMBUS_READ_BLOCK_DATA.\n"
333 "Fallback method does not support PEC.\n");
334
335 /* Adapter needs to support these two functions */
336 if (!i2c_check_functionality(client->adapter,
337 I2C_FUNC_SMBUS_BYTE_DATA |
338 I2C_FUNC_SMBUS_I2C_BLOCK)){
339 return -ENODEV;
340 }
341
342 /* Get the length of block data */
343 while (retries_length > 0) {
344 ret = i2c_smbus_read_byte_data(client, address);
345 if (ret >= 0)
346 break;
347 retries_length--;
348 }
349
350 if (ret < 0) {
351 dev_dbg(&client->dev,
352 "%s: i2c read at address 0x%x failed\n",
353 __func__, address);
354 return ret;
355 }
356
357 /* block_length does not include NULL terminator */
358 block_length = ret;
359 if (block_length > I2C_SMBUS_BLOCK_MAX) {
360 dev_err(&client->dev,
361 "%s: Returned block_length is longer than 0x%x\n",
362 __func__, I2C_SMBUS_BLOCK_MAX);
363 return -EINVAL;
364 }
365
366 /* Get the block data */
367 while (retries_block > 0) {
368 ret = i2c_smbus_read_i2c_block_data(
369 client, address,
370 block_length + 1, block_buffer);
371 if (ret >= 0)
372 break;
373 retries_block--;
374 }
375
376 if (ret < 0) {
377 dev_dbg(&client->dev,
378 "%s: i2c read at address 0x%x failed\n",
379 __func__, address);
380 return ret;
381 }
382
383 /* block_buffer[0] == block_length */
384 memcpy(values, block_buffer + 1, block_length);
385 values[block_length] = '\0';
386
387 return ret;
388 }
389
390 static int sbs_read_string_data(struct i2c_client *client, u8 address, char *values)
391 {
392 struct sbs_info *chip = i2c_get_clientdata(client);
393 int retries = chip->i2c_retry_count;
394 int ret = 0;
395
396 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_READ_BLOCK_DATA)) {
397 bool pec = client->flags & I2C_CLIENT_PEC;
398 client->flags &= ~I2C_CLIENT_PEC;
399 ret = sbs_read_string_data_fallback(client, address, values);
400 if (pec)
401 client->flags |= I2C_CLIENT_PEC;
402 return ret;
403 }
404
405 while (retries > 0) {
406 ret = i2c_smbus_read_block_data(client, address, values);
407 if (ret >= 0)
408 break;
409 retries--;
410 }
411
412 if (ret < 0) {
413 dev_dbg(&client->dev, "failed to read block 0x%x: %d\n", address, ret);
414 return ret;
415 }
416
417 /* add string termination */
418 values[ret] = '\0';
419 return ret;
420 }
421
422 static int sbs_write_word_data(struct i2c_client *client, u8 address,
423 u16 value)
424 {
425 struct sbs_info *chip = i2c_get_clientdata(client);
426 int retries = chip->i2c_retry_count;
427 s32 ret = 0;
428
429 while (retries > 0) {
430 ret = i2c_smbus_write_word_data(client, address, value);
431 if (ret >= 0)
432 break;
433 retries--;
434 }
435
436 if (ret < 0) {
437 dev_dbg(&client->dev,
438 "%s: i2c write to address 0x%x failed\n",
439 __func__, address);
440 return ret;
441 }
442
443 return 0;
444 }
445
446 static int sbs_status_correct(struct i2c_client *client, int *intval)
447 {
448 int ret;
449
450 ret = sbs_read_word_data(client, sbs_data[REG_CURRENT_NOW].addr);
451 if (ret < 0)
452 return ret;
453
454 ret = (s16)ret;
455
456 /* Not drawing current -> not charging (i.e. idle) */
457 if (*intval != POWER_SUPPLY_STATUS_FULL && ret == 0)
458 *intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
459
460 if (*intval == POWER_SUPPLY_STATUS_FULL) {
461 /* Drawing or providing current when full */
462 if (ret > 0)
463 *intval = POWER_SUPPLY_STATUS_CHARGING;
464 else if (ret < 0)
465 *intval = POWER_SUPPLY_STATUS_DISCHARGING;
466 }
467
468 return 0;
469 }
470
471 static bool sbs_bat_needs_calibration(struct i2c_client *client)
472 {
473 int ret;
474
475 ret = sbs_read_word_data(client, sbs_data[REG_BATTERY_MODE].addr);
476 if (ret < 0)
477 return false;
478
479 return !!(ret & BIT(7));
480 }
481
482 static int sbs_get_ti_battery_presence_and_health(
483 struct i2c_client *client, enum power_supply_property psp,
484 union power_supply_propval *val)
485 {
486 s32 ret;
487
488 /*
489 * Write to ManufacturerAccess with ManufacturerAccess command
490 * and then read the status.
491 */
492 ret = sbs_write_word_data(client, sbs_data[REG_MANUFACTURER_DATA].addr,
493 MANUFACTURER_ACCESS_STATUS);
494 if (ret < 0) {
495 if (psp == POWER_SUPPLY_PROP_PRESENT)
496 val->intval = 0; /* battery removed */
497 return ret;
498 }
499
500 ret = sbs_read_word_data(client, sbs_data[REG_MANUFACTURER_DATA].addr);
501 if (ret < 0) {
502 if (psp == POWER_SUPPLY_PROP_PRESENT)
503 val->intval = 0; /* battery removed */
504 return ret;
505 }
506
507 if (ret < sbs_data[REG_MANUFACTURER_DATA].min_value ||
508 ret > sbs_data[REG_MANUFACTURER_DATA].max_value) {
509 val->intval = 0;
510 return 0;
511 }
512
513 /* Mask the upper nibble of 2nd byte and
514 * lower byte of response then
515 * shift the result by 8 to get status*/
516 ret &= 0x0F00;
517 ret >>= 8;
518 if (psp == POWER_SUPPLY_PROP_PRESENT) {
519 if (ret == 0x0F)
520 /* battery removed */
521 val->intval = 0;
522 else
523 val->intval = 1;
524 } else if (psp == POWER_SUPPLY_PROP_HEALTH) {
525 if (ret == 0x09)
526 val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
527 else if (ret == 0x0B)
528 val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
529 else if (ret == 0x0C)
530 val->intval = POWER_SUPPLY_HEALTH_DEAD;
531 else if (sbs_bat_needs_calibration(client))
532 val->intval = POWER_SUPPLY_HEALTH_CALIBRATION_REQUIRED;
533 else
534 val->intval = POWER_SUPPLY_HEALTH_GOOD;
535 }
536
537 return 0;
538 }
539
540 static int sbs_get_battery_presence_and_health(
541 struct i2c_client *client, enum power_supply_property psp,
542 union power_supply_propval *val)
543 {
544 struct sbs_info *chip = i2c_get_clientdata(client);
545 int ret;
546
547 if (chip->flags & SBS_FLAGS_TI_BQ20ZX5)
548 return sbs_get_ti_battery_presence_and_health(client, psp, val);
549
550 /* Dummy command; if it succeeds, battery is present. */
551 ret = sbs_read_word_data(client, sbs_data[REG_STATUS].addr);
552
553 if (ret < 0) { /* battery not present*/
554 if (psp == POWER_SUPPLY_PROP_PRESENT) {
555 val->intval = 0;
556 return 0;
557 }
558 return ret;
559 }
560
561 if (psp == POWER_SUPPLY_PROP_PRESENT)
562 val->intval = 1; /* battery present */
563 else { /* POWER_SUPPLY_PROP_HEALTH */
564 if (sbs_bat_needs_calibration(client)) {
565 val->intval = POWER_SUPPLY_HEALTH_CALIBRATION_REQUIRED;
566 } else {
567 /* SBS spec doesn't have a general health command. */
568 val->intval = POWER_SUPPLY_HEALTH_UNKNOWN;
569 }
570 }
571
572 return 0;
573 }
574
575 static int sbs_get_battery_property(struct i2c_client *client,
576 int reg_offset, enum power_supply_property psp,
577 union power_supply_propval *val)
578 {
579 struct sbs_info *chip = i2c_get_clientdata(client);
580 s32 ret;
581
582 ret = sbs_read_word_data(client, sbs_data[reg_offset].addr);
583 if (ret < 0)
584 return ret;
585
586 /* returned values are 16 bit */
587 if (sbs_data[reg_offset].min_value < 0)
588 ret = (s16)ret;
589
590 if (ret >= sbs_data[reg_offset].min_value &&
591 ret <= sbs_data[reg_offset].max_value) {
592 val->intval = ret;
593 if (psp == POWER_SUPPLY_PROP_CAPACITY_LEVEL) {
594 if (!(ret & BATTERY_INITIALIZED))
595 val->intval =
596 POWER_SUPPLY_CAPACITY_LEVEL_UNKNOWN;
597 else if (ret & BATTERY_FULL_CHARGED)
598 val->intval =
599 POWER_SUPPLY_CAPACITY_LEVEL_FULL;
600 else if (ret & BATTERY_FULL_DISCHARGED)
601 val->intval =
602 POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
603 else
604 val->intval =
605 POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
606 return 0;
607 } else if (psp != POWER_SUPPLY_PROP_STATUS) {
608 return 0;
609 }
610
611 if (ret & BATTERY_FULL_CHARGED)
612 val->intval = POWER_SUPPLY_STATUS_FULL;
613 else if (ret & BATTERY_DISCHARGING)
614 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
615 else
616 val->intval = POWER_SUPPLY_STATUS_CHARGING;
617
618 sbs_status_correct(client, &val->intval);
619
620 if (chip->poll_time == 0)
621 chip->last_state = val->intval;
622 else if (chip->last_state != val->intval) {
623 cancel_delayed_work_sync(&chip->work);
624 power_supply_changed(chip->power_supply);
625 chip->poll_time = 0;
626 }
627 } else {
628 if (psp == POWER_SUPPLY_PROP_STATUS)
629 val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
630 else if (psp == POWER_SUPPLY_PROP_CAPACITY)
631 /* sbs spec says that this can be >100 %
632 * even if max value is 100 %
633 */
634 val->intval = min(ret, 100);
635 else
636 val->intval = 0;
637 }
638
639 return 0;
640 }
641
642 static int sbs_get_battery_string_property(struct i2c_client *client,
643 int reg_offset, enum power_supply_property psp, char *val)
644 {
645 s32 ret;
646
647 ret = sbs_read_string_data(client, sbs_data[reg_offset].addr, val);
648
649 if (ret < 0)
650 return ret;
651
652 return 0;
653 }
654
655 static void sbs_unit_adjustment(struct i2c_client *client,
656 enum power_supply_property psp, union power_supply_propval *val)
657 {
658 #define BASE_UNIT_CONVERSION 1000
659 #define BATTERY_MODE_CAP_MULT_WATT (10 * BASE_UNIT_CONVERSION)
660 #define TIME_UNIT_CONVERSION 60
661 #define TEMP_KELVIN_TO_CELSIUS 2731
662 switch (psp) {
663 case POWER_SUPPLY_PROP_ENERGY_NOW:
664 case POWER_SUPPLY_PROP_ENERGY_FULL:
665 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
666 /* sbs provides energy in units of 10mWh.
667 * Convert to µWh
668 */
669 val->intval *= BATTERY_MODE_CAP_MULT_WATT;
670 break;
671
672 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
673 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
674 case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
675 case POWER_SUPPLY_PROP_CURRENT_NOW:
676 case POWER_SUPPLY_PROP_CURRENT_AVG:
677 case POWER_SUPPLY_PROP_CHARGE_NOW:
678 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
679 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
680 case POWER_SUPPLY_PROP_CHARGE_FULL:
681 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
682 val->intval *= BASE_UNIT_CONVERSION;
683 break;
684
685 case POWER_SUPPLY_PROP_TEMP:
686 /* sbs provides battery temperature in 0.1K
687 * so convert it to 0.1°C
688 */
689 val->intval -= TEMP_KELVIN_TO_CELSIUS;
690 break;
691
692 case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
693 case POWER_SUPPLY_PROP_TIME_TO_FULL_AVG:
694 /* sbs provides time to empty and time to full in minutes.
695 * Convert to seconds
696 */
697 val->intval *= TIME_UNIT_CONVERSION;
698 break;
699
700 default:
701 dev_dbg(&client->dev,
702 "%s: no need for unit conversion %d\n", __func__, psp);
703 }
704 }
705
706 static enum sbs_capacity_mode sbs_set_capacity_mode(struct i2c_client *client,
707 enum sbs_capacity_mode mode)
708 {
709 int ret, original_val;
710
711 original_val = sbs_read_word_data(client, BATTERY_MODE_OFFSET);
712 if (original_val < 0)
713 return original_val;
714
715 if ((original_val & BATTERY_MODE_CAPACITY_MASK) == mode)
716 return mode;
717
718 if (mode == CAPACITY_MODE_AMPS)
719 ret = original_val & ~BATTERY_MODE_CAPACITY_MASK;
720 else
721 ret = original_val | BATTERY_MODE_CAPACITY_MASK;
722
723 ret = sbs_write_word_data(client, BATTERY_MODE_OFFSET, ret);
724 if (ret < 0)
725 return ret;
726
727 usleep_range(1000, 2000);
728
729 return original_val & BATTERY_MODE_CAPACITY_MASK;
730 }
731
732 static int sbs_get_battery_capacity(struct i2c_client *client,
733 int reg_offset, enum power_supply_property psp,
734 union power_supply_propval *val)
735 {
736 s32 ret;
737 enum sbs_capacity_mode mode = CAPACITY_MODE_WATTS;
738
739 if (power_supply_is_amp_property(psp))
740 mode = CAPACITY_MODE_AMPS;
741
742 mode = sbs_set_capacity_mode(client, mode);
743 if ((int)mode < 0)
744 return mode;
745
746 ret = sbs_read_word_data(client, sbs_data[reg_offset].addr);
747 if (ret < 0)
748 return ret;
749
750 val->intval = ret;
751
752 ret = sbs_set_capacity_mode(client, mode);
753 if (ret < 0)
754 return ret;
755
756 return 0;
757 }
758
759 static char sbs_serial[5];
760 static int sbs_get_battery_serial_number(struct i2c_client *client,
761 union power_supply_propval *val)
762 {
763 int ret;
764
765 ret = sbs_read_word_data(client, sbs_data[REG_SERIAL_NUMBER].addr);
766 if (ret < 0)
767 return ret;
768
769 sprintf(sbs_serial, "%04x", ret);
770 val->strval = sbs_serial;
771
772 return 0;
773 }
774
775 static int sbs_get_property_index(struct i2c_client *client,
776 enum power_supply_property psp)
777 {
778 int count;
779 for (count = 0; count < ARRAY_SIZE(sbs_data); count++)
780 if (psp == sbs_data[count].psp)
781 return count;
782
783 dev_warn(&client->dev,
784 "%s: Invalid Property - %d\n", __func__, psp);
785
786 return -EINVAL;
787 }
788
789 static int sbs_get_chemistry(struct i2c_client *client,
790 union power_supply_propval *val)
791 {
792 enum power_supply_property psp = POWER_SUPPLY_PROP_TECHNOLOGY;
793 int ret;
794
795 ret = sbs_get_property_index(client, psp);
796 if (ret < 0)
797 return ret;
798
799 ret = sbs_get_battery_string_property(client, ret, psp,
800 chemistry);
801 if (ret < 0)
802 return ret;
803
804 if (!strncasecmp(chemistry, "LION", 4))
805 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
806 else if (!strncasecmp(chemistry, "LiP", 3))
807 val->intval = POWER_SUPPLY_TECHNOLOGY_LIPO;
808 else if (!strncasecmp(chemistry, "NiCd", 4))
809 val->intval = POWER_SUPPLY_TECHNOLOGY_NiCd;
810 else if (!strncasecmp(chemistry, "NiMH", 4))
811 val->intval = POWER_SUPPLY_TECHNOLOGY_NiMH;
812 else
813 val->intval = POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
814
815 if (val->intval == POWER_SUPPLY_TECHNOLOGY_UNKNOWN)
816 dev_warn(&client->dev, "Unknown chemistry: %s\n", chemistry);
817
818 return 0;
819 }
820
821 static int sbs_get_battery_manufacture_date(struct i2c_client *client,
822 enum power_supply_property psp,
823 union power_supply_propval *val)
824 {
825 int ret;
826 u16 day, month, year;
827
828 ret = sbs_read_word_data(client, REG_ADDR_MANUFACTURE_DATE);
829 if (ret < 0)
830 return ret;
831
832 day = ret & GENMASK(4, 0);
833 month = (ret & GENMASK(8, 5)) >> 5;
834 year = ((ret & GENMASK(15, 9)) >> 9) + 1980;
835
836 switch (psp) {
837 case POWER_SUPPLY_PROP_MANUFACTURE_YEAR:
838 val->intval = year;
839 break;
840 case POWER_SUPPLY_PROP_MANUFACTURE_MONTH:
841 val->intval = month;
842 break;
843 case POWER_SUPPLY_PROP_MANUFACTURE_DAY:
844 val->intval = day;
845 break;
846 default:
847 return -EINVAL;
848 }
849
850 return 0;
851 }
852
853 static int sbs_get_property(struct power_supply *psy,
854 enum power_supply_property psp,
855 union power_supply_propval *val)
856 {
857 int ret = 0;
858 struct sbs_info *chip = power_supply_get_drvdata(psy);
859 struct i2c_client *client = chip->client;
860
861 if (chip->gpio_detect) {
862 ret = gpiod_get_value_cansleep(chip->gpio_detect);
863 if (ret < 0)
864 return ret;
865 if (psp == POWER_SUPPLY_PROP_PRESENT) {
866 val->intval = ret;
867 sbs_update_presence(chip, ret);
868 return 0;
869 }
870 if (ret == 0)
871 return -ENODATA;
872 }
873
874 switch (psp) {
875 case POWER_SUPPLY_PROP_PRESENT:
876 case POWER_SUPPLY_PROP_HEALTH:
877 ret = sbs_get_battery_presence_and_health(client, psp, val);
878
879 /* this can only be true if no gpio is used */
880 if (psp == POWER_SUPPLY_PROP_PRESENT)
881 return 0;
882 break;
883
884 case POWER_SUPPLY_PROP_TECHNOLOGY:
885 ret = sbs_get_chemistry(client, val);
886 if (ret < 0)
887 break;
888
889 goto done; /* don't trigger power_supply_changed()! */
890
891 case POWER_SUPPLY_PROP_ENERGY_NOW:
892 case POWER_SUPPLY_PROP_ENERGY_FULL:
893 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
894 case POWER_SUPPLY_PROP_CHARGE_NOW:
895 case POWER_SUPPLY_PROP_CHARGE_FULL:
896 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
897 ret = sbs_get_property_index(client, psp);
898 if (ret < 0)
899 break;
900
901 /* sbs_get_battery_capacity() will change the battery mode
902 * temporarily to read the requested attribute. Ensure we stay
903 * in the desired mode for the duration of the attribute read.
904 */
905 mutex_lock(&chip->mode_lock);
906 ret = sbs_get_battery_capacity(client, ret, psp, val);
907 mutex_unlock(&chip->mode_lock);
908 break;
909
910 case POWER_SUPPLY_PROP_SERIAL_NUMBER:
911 ret = sbs_get_battery_serial_number(client, val);
912 break;
913
914 case POWER_SUPPLY_PROP_STATUS:
915 case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
916 case POWER_SUPPLY_PROP_CYCLE_COUNT:
917 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
918 case POWER_SUPPLY_PROP_CURRENT_NOW:
919 case POWER_SUPPLY_PROP_CURRENT_AVG:
920 case POWER_SUPPLY_PROP_TEMP:
921 case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
922 case POWER_SUPPLY_PROP_TIME_TO_FULL_AVG:
923 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
924 case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
925 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
926 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
927 case POWER_SUPPLY_PROP_CAPACITY:
928 case POWER_SUPPLY_PROP_CAPACITY_ERROR_MARGIN:
929 ret = sbs_get_property_index(client, psp);
930 if (ret < 0)
931 break;
932
933 ret = sbs_get_battery_property(client, ret, psp, val);
934 break;
935
936 case POWER_SUPPLY_PROP_MODEL_NAME:
937 ret = sbs_get_property_index(client, psp);
938 if (ret < 0)
939 break;
940
941 ret = sbs_get_battery_string_property(client, ret, psp,
942 model_name);
943 val->strval = model_name;
944 break;
945
946 case POWER_SUPPLY_PROP_MANUFACTURER:
947 ret = sbs_get_property_index(client, psp);
948 if (ret < 0)
949 break;
950
951 ret = sbs_get_battery_string_property(client, ret, psp,
952 manufacturer);
953 val->strval = manufacturer;
954 break;
955
956 case POWER_SUPPLY_PROP_MANUFACTURE_YEAR:
957 case POWER_SUPPLY_PROP_MANUFACTURE_MONTH:
958 case POWER_SUPPLY_PROP_MANUFACTURE_DAY:
959 ret = sbs_get_battery_manufacture_date(client, psp, val);
960 break;
961
962 default:
963 dev_err(&client->dev,
964 "%s: INVALID property\n", __func__);
965 return -EINVAL;
966 }
967
968 if (!chip->gpio_detect && chip->is_present != (ret >= 0)) {
969 bool old_present = chip->is_present;
970 union power_supply_propval val;
971 int err = sbs_get_battery_presence_and_health(
972 client, POWER_SUPPLY_PROP_PRESENT, &val);
973
974 sbs_update_presence(chip, !err && val.intval);
975
976 if (old_present != chip->is_present)
977 power_supply_changed(chip->power_supply);
978 }
979
980 done:
981 if (!ret) {
982 /* Convert units to match requirements for power supply class */
983 sbs_unit_adjustment(client, psp, val);
984 dev_dbg(&client->dev,
985 "%s: property = %d, value = %x\n", __func__,
986 psp, val->intval);
987 } else if (!chip->is_present) {
988 /* battery not present, so return NODATA for properties */
989 ret = -ENODATA;
990 }
991 return ret;
992 }
993
994 static void sbs_supply_changed(struct sbs_info *chip)
995 {
996 struct power_supply *battery = chip->power_supply;
997 int ret;
998
999 ret = gpiod_get_value_cansleep(chip->gpio_detect);
1000 if (ret < 0)
1001 return;
1002 sbs_update_presence(chip, ret);
1003 power_supply_changed(battery);
1004 }
1005
1006 static irqreturn_t sbs_irq(int irq, void *devid)
1007 {
1008 sbs_supply_changed(devid);
1009 return IRQ_HANDLED;
1010 }
1011
1012 static void sbs_alert(struct i2c_client *client, enum i2c_alert_protocol prot,
1013 unsigned int data)
1014 {
1015 sbs_supply_changed(i2c_get_clientdata(client));
1016 }
1017
1018 static void sbs_external_power_changed(struct power_supply *psy)
1019 {
1020 struct sbs_info *chip = power_supply_get_drvdata(psy);
1021
1022 /* cancel outstanding work */
1023 cancel_delayed_work_sync(&chip->work);
1024
1025 schedule_delayed_work(&chip->work, HZ);
1026 chip->poll_time = chip->poll_retry_count;
1027 }
1028
1029 static void sbs_delayed_work(struct work_struct *work)
1030 {
1031 struct sbs_info *chip;
1032 s32 ret;
1033
1034 chip = container_of(work, struct sbs_info, work.work);
1035
1036 ret = sbs_read_word_data(chip->client, sbs_data[REG_STATUS].addr);
1037 /* if the read failed, give up on this work */
1038 if (ret < 0) {
1039 chip->poll_time = 0;
1040 return;
1041 }
1042
1043 if (ret & BATTERY_FULL_CHARGED)
1044 ret = POWER_SUPPLY_STATUS_FULL;
1045 else if (ret & BATTERY_DISCHARGING)
1046 ret = POWER_SUPPLY_STATUS_DISCHARGING;
1047 else
1048 ret = POWER_SUPPLY_STATUS_CHARGING;
1049
1050 sbs_status_correct(chip->client, &ret);
1051
1052 if (chip->last_state != ret) {
1053 chip->poll_time = 0;
1054 power_supply_changed(chip->power_supply);
1055 return;
1056 }
1057 if (chip->poll_time > 0) {
1058 schedule_delayed_work(&chip->work, HZ);
1059 chip->poll_time--;
1060 return;
1061 }
1062 }
1063
1064 static const struct power_supply_desc sbs_default_desc = {
1065 .type = POWER_SUPPLY_TYPE_BATTERY,
1066 .properties = sbs_properties,
1067 .num_properties = ARRAY_SIZE(sbs_properties),
1068 .get_property = sbs_get_property,
1069 .external_power_changed = sbs_external_power_changed,
1070 };
1071
1072 static int sbs_probe(struct i2c_client *client)
1073 {
1074 struct sbs_info *chip;
1075 struct power_supply_desc *sbs_desc;
1076 struct sbs_platform_data *pdata = client->dev.platform_data;
1077 struct power_supply_config psy_cfg = {};
1078 int rc;
1079 int irq;
1080
1081 sbs_desc = devm_kmemdup(&client->dev, &sbs_default_desc,
1082 sizeof(*sbs_desc), GFP_KERNEL);
1083 if (!sbs_desc)
1084 return -ENOMEM;
1085
1086 sbs_desc->name = devm_kasprintf(&client->dev, GFP_KERNEL, "sbs-%s",
1087 dev_name(&client->dev));
1088 if (!sbs_desc->name)
1089 return -ENOMEM;
1090
1091 chip = devm_kzalloc(&client->dev, sizeof(struct sbs_info), GFP_KERNEL);
1092 if (!chip)
1093 return -ENOMEM;
1094
1095 chip->flags = (u32)(uintptr_t)device_get_match_data(&client->dev);
1096 chip->client = client;
1097 psy_cfg.of_node = client->dev.of_node;
1098 psy_cfg.drv_data = chip;
1099 chip->last_state = POWER_SUPPLY_STATUS_UNKNOWN;
1100 mutex_init(&chip->mode_lock);
1101
1102 /* use pdata if available, fall back to DT properties,
1103 * or hardcoded defaults if not
1104 */
1105 rc = device_property_read_u32(&client->dev, "sbs,i2c-retry-count",
1106 &chip->i2c_retry_count);
1107 if (rc)
1108 chip->i2c_retry_count = 0;
1109
1110 rc = device_property_read_u32(&client->dev, "sbs,poll-retry-count",
1111 &chip->poll_retry_count);
1112 if (rc)
1113 chip->poll_retry_count = 0;
1114
1115 if (pdata) {
1116 chip->poll_retry_count = pdata->poll_retry_count;
1117 chip->i2c_retry_count = pdata->i2c_retry_count;
1118 }
1119 chip->i2c_retry_count = chip->i2c_retry_count + 1;
1120
1121 chip->charger_broadcasts = !device_property_read_bool(&client->dev,
1122 "sbs,disable-charger-broadcasts");
1123
1124 chip->gpio_detect = devm_gpiod_get_optional(&client->dev,
1125 "sbs,battery-detect", GPIOD_IN);
1126 if (IS_ERR(chip->gpio_detect)) {
1127 dev_err(&client->dev, "Failed to get gpio: %ld\n",
1128 PTR_ERR(chip->gpio_detect));
1129 return PTR_ERR(chip->gpio_detect);
1130 }
1131
1132 i2c_set_clientdata(client, chip);
1133
1134 if (!chip->gpio_detect)
1135 goto skip_gpio;
1136
1137 irq = gpiod_to_irq(chip->gpio_detect);
1138 if (irq <= 0) {
1139 dev_warn(&client->dev, "Failed to get gpio as irq: %d\n", irq);
1140 goto skip_gpio;
1141 }
1142
1143 rc = devm_request_threaded_irq(&client->dev, irq, NULL, sbs_irq,
1144 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
1145 dev_name(&client->dev), chip);
1146 if (rc) {
1147 dev_warn(&client->dev, "Failed to request irq: %d\n", rc);
1148 goto skip_gpio;
1149 }
1150
1151 skip_gpio:
1152 /*
1153 * Before we register, we might need to make sure we can actually talk
1154 * to the battery.
1155 */
1156 if (!(force_load || chip->gpio_detect)) {
1157 union power_supply_propval val;
1158
1159 rc = sbs_get_battery_presence_and_health(
1160 client, POWER_SUPPLY_PROP_PRESENT, &val);
1161 if (rc < 0 || !val.intval) {
1162 dev_err(&client->dev, "Failed to get present status\n");
1163 rc = -ENODEV;
1164 goto exit_psupply;
1165 }
1166 }
1167
1168 INIT_DELAYED_WORK(&chip->work, sbs_delayed_work);
1169
1170 chip->power_supply = devm_power_supply_register(&client->dev, sbs_desc,
1171 &psy_cfg);
1172 if (IS_ERR(chip->power_supply)) {
1173 dev_err(&client->dev,
1174 "%s: Failed to register power supply\n", __func__);
1175 rc = PTR_ERR(chip->power_supply);
1176 goto exit_psupply;
1177 }
1178
1179 dev_info(&client->dev,
1180 "%s: battery gas gauge device registered\n", client->name);
1181
1182 return 0;
1183
1184 exit_psupply:
1185 return rc;
1186 }
1187
1188 static int sbs_remove(struct i2c_client *client)
1189 {
1190 struct sbs_info *chip = i2c_get_clientdata(client);
1191
1192 cancel_delayed_work_sync(&chip->work);
1193
1194 return 0;
1195 }
1196
1197 #if defined CONFIG_PM_SLEEP
1198
1199 static int sbs_suspend(struct device *dev)
1200 {
1201 struct i2c_client *client = to_i2c_client(dev);
1202 struct sbs_info *chip = i2c_get_clientdata(client);
1203 int ret;
1204
1205 if (chip->poll_time > 0)
1206 cancel_delayed_work_sync(&chip->work);
1207
1208 if (chip->flags & SBS_FLAGS_TI_BQ20ZX5) {
1209 /* Write to manufacturer access with sleep command. */
1210 ret = sbs_write_word_data(client,
1211 sbs_data[REG_MANUFACTURER_DATA].addr,
1212 MANUFACTURER_ACCESS_SLEEP);
1213 if (chip->is_present && ret < 0)
1214 return ret;
1215 }
1216
1217 return 0;
1218 }
1219
1220 static SIMPLE_DEV_PM_OPS(sbs_pm_ops, sbs_suspend, NULL);
1221 #define SBS_PM_OPS (&sbs_pm_ops)
1222
1223 #else
1224 #define SBS_PM_OPS NULL
1225 #endif
1226
1227 static const struct i2c_device_id sbs_id[] = {
1228 { "bq20z65", 0 },
1229 { "bq20z75", 0 },
1230 { "sbs-battery", 1 },
1231 {}
1232 };
1233 MODULE_DEVICE_TABLE(i2c, sbs_id);
1234
1235 static const struct of_device_id sbs_dt_ids[] = {
1236 { .compatible = "sbs,sbs-battery" },
1237 {
1238 .compatible = "ti,bq20z65",
1239 .data = (void *)SBS_FLAGS_TI_BQ20ZX5,
1240 },
1241 {
1242 .compatible = "ti,bq20z75",
1243 .data = (void *)SBS_FLAGS_TI_BQ20ZX5,
1244 },
1245 { }
1246 };
1247 MODULE_DEVICE_TABLE(of, sbs_dt_ids);
1248
1249 static struct i2c_driver sbs_battery_driver = {
1250 .probe_new = sbs_probe,
1251 .remove = sbs_remove,
1252 .alert = sbs_alert,
1253 .id_table = sbs_id,
1254 .driver = {
1255 .name = "sbs-battery",
1256 .of_match_table = sbs_dt_ids,
1257 .pm = SBS_PM_OPS,
1258 },
1259 };
1260 module_i2c_driver(sbs_battery_driver);
1261
1262 MODULE_DESCRIPTION("SBS battery monitor driver");
1263 MODULE_LICENSE("GPL");
1264
1265 module_param(force_load, bool, 0444);
1266 MODULE_PARM_DESC(force_load,
1267 "Attempt to load the driver even if no battery is connected");
Linux with added FPC-III support