1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Gas Gauge driver for SBS Compliant Batteries
5 * Copyright (c) 2010, NVIDIA Corporation.
8 #include <linux/bits.h>
9 #include <linux/delay.h>
10 #include <linux/devm-helpers.h>
11 #include <linux/err.h>
12 #include <linux/gpio/consumer.h>
13 #include <linux/i2c.h>
14 #include <linux/init.h>
15 #include <linux/interrupt.h>
16 #include <linux/kernel.h>
17 #include <linux/module.h>
18 #include <linux/property.h>
19 #include <linux/of_device.h>
20 #include <linux/power/sbs-battery.h>
21 #include <linux/power_supply.h>
22 #include <linux/slab.h>
23 #include <linux/stat.h>
26 REG_MANUFACTURER_DATA,
40 REG_REMAINING_CAPACITY,
41 REG_REMAINING_CAPACITY_CHARGE,
42 REG_FULL_CHARGE_CAPACITY,
43 REG_FULL_CHARGE_CAPACITY_CHARGE,
45 REG_DESIGN_CAPACITY_CHARGE,
46 REG_DESIGN_VOLTAGE_MIN,
47 REG_DESIGN_VOLTAGE_MAX,
55 #define REG_ADDR_SPEC_INFO 0x1A
56 #define SPEC_INFO_VERSION_MASK GENMASK(7, 4)
57 #define SPEC_INFO_VERSION_SHIFT 4
59 #define SBS_VERSION_1_0 1
60 #define SBS_VERSION_1_1 2
61 #define SBS_VERSION_1_1_WITH_PEC 3
63 #define REG_ADDR_MANUFACTURE_DATE 0x1B
65 /* Battery Mode defines */
66 #define BATTERY_MODE_OFFSET 0x03
67 #define BATTERY_MODE_CAPACITY_MASK BIT(15)
68 enum sbs_capacity_mode {
69 CAPACITY_MODE_AMPS = 0,
70 CAPACITY_MODE_WATTS = BATTERY_MODE_CAPACITY_MASK
72 #define BATTERY_MODE_CHARGER_MASK (1<<14)
74 /* manufacturer access defines */
75 #define MANUFACTURER_ACCESS_STATUS 0x0006
76 #define MANUFACTURER_ACCESS_SLEEP 0x0011
78 /* battery status value bits */
79 #define BATTERY_INITIALIZED 0x80
80 #define BATTERY_DISCHARGING 0x40
81 #define BATTERY_FULL_CHARGED 0x20
82 #define BATTERY_FULL_DISCHARGED 0x10
84 /* min_value and max_value are only valid for numerical data */
85 #define SBS_DATA(_psp, _addr, _min_value, _max_value) { \
88 .min_value = _min_value, \
89 .max_value = _max_value, \
92 static const struct chip_data {
93 enum power_supply_property psp;
98 [REG_MANUFACTURER_DATA] =
99 SBS_DATA(POWER_SUPPLY_PROP_PRESENT, 0x00, 0, 65535),
101 SBS_DATA(-1, 0x03, 0, 65535),
103 SBS_DATA(POWER_SUPPLY_PROP_TEMP, 0x08, 0, 65535),
105 SBS_DATA(POWER_SUPPLY_PROP_VOLTAGE_NOW, 0x09, 0, 20000),
107 SBS_DATA(POWER_SUPPLY_PROP_CURRENT_NOW, 0x0A, -32768, 32767),
109 SBS_DATA(POWER_SUPPLY_PROP_CURRENT_AVG, 0x0B, -32768, 32767),
111 SBS_DATA(POWER_SUPPLY_PROP_CAPACITY_ERROR_MARGIN, 0x0c, 0, 100),
113 SBS_DATA(POWER_SUPPLY_PROP_CAPACITY, 0x0D, 0, 100),
114 [REG_REMAINING_CAPACITY] =
115 SBS_DATA(POWER_SUPPLY_PROP_ENERGY_NOW, 0x0F, 0, 65535),
116 [REG_REMAINING_CAPACITY_CHARGE] =
117 SBS_DATA(POWER_SUPPLY_PROP_CHARGE_NOW, 0x0F, 0, 65535),
118 [REG_FULL_CHARGE_CAPACITY] =
119 SBS_DATA(POWER_SUPPLY_PROP_ENERGY_FULL, 0x10, 0, 65535),
120 [REG_FULL_CHARGE_CAPACITY_CHARGE] =
121 SBS_DATA(POWER_SUPPLY_PROP_CHARGE_FULL, 0x10, 0, 65535),
122 [REG_TIME_TO_EMPTY] =
123 SBS_DATA(POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG, 0x12, 0, 65535),
125 SBS_DATA(POWER_SUPPLY_PROP_TIME_TO_FULL_AVG, 0x13, 0, 65535),
126 [REG_CHARGE_CURRENT] =
127 SBS_DATA(POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX, 0x14, 0, 65535),
128 [REG_CHARGE_VOLTAGE] =
129 SBS_DATA(POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX, 0x15, 0, 65535),
131 SBS_DATA(POWER_SUPPLY_PROP_STATUS, 0x16, 0, 65535),
132 [REG_CAPACITY_LEVEL] =
133 SBS_DATA(POWER_SUPPLY_PROP_CAPACITY_LEVEL, 0x16, 0, 65535),
135 SBS_DATA(POWER_SUPPLY_PROP_CYCLE_COUNT, 0x17, 0, 65535),
136 [REG_DESIGN_CAPACITY] =
137 SBS_DATA(POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN, 0x18, 0, 65535),
138 [REG_DESIGN_CAPACITY_CHARGE] =
139 SBS_DATA(POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, 0x18, 0, 65535),
140 [REG_DESIGN_VOLTAGE_MIN] =
141 SBS_DATA(POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, 0x19, 0, 65535),
142 [REG_DESIGN_VOLTAGE_MAX] =
143 SBS_DATA(POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN, 0x19, 0, 65535),
144 [REG_SERIAL_NUMBER] =
145 SBS_DATA(POWER_SUPPLY_PROP_SERIAL_NUMBER, 0x1C, 0, 65535),
146 /* Properties of type `const char *' */
148 SBS_DATA(POWER_SUPPLY_PROP_MANUFACTURER, 0x20, 0, 65535),
150 SBS_DATA(POWER_SUPPLY_PROP_MODEL_NAME, 0x21, 0, 65535),
152 SBS_DATA(POWER_SUPPLY_PROP_TECHNOLOGY, 0x22, 0, 65535)
155 static const enum power_supply_property sbs_properties[] = {
156 POWER_SUPPLY_PROP_STATUS,
157 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
158 POWER_SUPPLY_PROP_HEALTH,
159 POWER_SUPPLY_PROP_PRESENT,
160 POWER_SUPPLY_PROP_TECHNOLOGY,
161 POWER_SUPPLY_PROP_CYCLE_COUNT,
162 POWER_SUPPLY_PROP_VOLTAGE_NOW,
163 POWER_SUPPLY_PROP_CURRENT_NOW,
164 POWER_SUPPLY_PROP_CURRENT_AVG,
165 POWER_SUPPLY_PROP_CAPACITY,
166 POWER_SUPPLY_PROP_CAPACITY_ERROR_MARGIN,
167 POWER_SUPPLY_PROP_TEMP,
168 POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
169 POWER_SUPPLY_PROP_TIME_TO_FULL_AVG,
170 POWER_SUPPLY_PROP_SERIAL_NUMBER,
171 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
172 POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
173 POWER_SUPPLY_PROP_ENERGY_NOW,
174 POWER_SUPPLY_PROP_ENERGY_FULL,
175 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
176 POWER_SUPPLY_PROP_CHARGE_NOW,
177 POWER_SUPPLY_PROP_CHARGE_FULL,
178 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
179 POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX,
180 POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX,
181 POWER_SUPPLY_PROP_MANUFACTURE_YEAR,
182 POWER_SUPPLY_PROP_MANUFACTURE_MONTH,
183 POWER_SUPPLY_PROP_MANUFACTURE_DAY,
184 /* Properties of type `const char *' */
185 POWER_SUPPLY_PROP_MANUFACTURER,
186 POWER_SUPPLY_PROP_MODEL_NAME
189 /* Supports special manufacturer commands from TI BQ20Z65 and BQ20Z75 IC. */
190 #define SBS_FLAGS_TI_BQ20ZX5 BIT(0)
193 struct i2c_client *client;
194 struct power_supply *power_supply;
196 struct gpio_desc *gpio_detect;
197 bool charger_broadcasts;
201 u32 poll_retry_count;
202 struct delayed_work work;
203 struct mutex mode_lock;
207 static char model_name[I2C_SMBUS_BLOCK_MAX + 1];
208 static char manufacturer[I2C_SMBUS_BLOCK_MAX + 1];
209 static char chemistry[I2C_SMBUS_BLOCK_MAX + 1];
210 static bool force_load;
212 static int sbs_read_word_data(struct i2c_client *client, u8 address);
213 static int sbs_write_word_data(struct i2c_client *client, u8 address, u16 value);
215 static void sbs_disable_charger_broadcasts(struct sbs_info *chip)
217 int val = sbs_read_word_data(chip->client, BATTERY_MODE_OFFSET);
221 val |= BATTERY_MODE_CHARGER_MASK;
223 val = sbs_write_word_data(chip->client, BATTERY_MODE_OFFSET, val);
227 dev_err(&chip->client->dev,
228 "Failed to disable charger broadcasting: %d\n", val);
230 dev_dbg(&chip->client->dev, "%s\n", __func__);
233 static int sbs_update_presence(struct sbs_info *chip, bool is_present)
235 struct i2c_client *client = chip->client;
236 int retries = chip->i2c_retry_count;
240 if (chip->is_present == is_present)
244 chip->is_present = false;
245 /* Disable PEC when no device is present */
246 client->flags &= ~I2C_CLIENT_PEC;
250 /* Check if device supports packet error checking and use it */
251 while (retries > 0) {
252 ret = i2c_smbus_read_word_data(client, REG_ADDR_SPEC_INFO);
257 * Some batteries trigger the detection pin before the
258 * I2C bus is properly connected. This works around the
267 dev_dbg(&client->dev, "failed to read spec info: %d\n", ret);
269 /* fallback to old behaviour */
270 client->flags &= ~I2C_CLIENT_PEC;
271 chip->is_present = true;
276 version = (ret & SPEC_INFO_VERSION_MASK) >> SPEC_INFO_VERSION_SHIFT;
278 if (version == SBS_VERSION_1_1_WITH_PEC)
279 client->flags |= I2C_CLIENT_PEC;
281 client->flags &= ~I2C_CLIENT_PEC;
283 if (of_device_is_compatible(client->dev.parent->of_node, "google,cros-ec-i2c-tunnel")
284 && client->flags & I2C_CLIENT_PEC) {
285 dev_info(&client->dev, "Disabling PEC because of broken Cros-EC implementation\n");
286 client->flags &= ~I2C_CLIENT_PEC;
289 dev_dbg(&client->dev, "PEC: %s\n", (client->flags & I2C_CLIENT_PEC) ?
290 "enabled" : "disabled");
292 if (!chip->is_present && is_present && !chip->charger_broadcasts)
293 sbs_disable_charger_broadcasts(chip);
295 chip->is_present = true;
300 static int sbs_read_word_data(struct i2c_client *client, u8 address)
302 struct sbs_info *chip = i2c_get_clientdata(client);
303 int retries = chip->i2c_retry_count;
306 while (retries > 0) {
307 ret = i2c_smbus_read_word_data(client, address);
314 dev_dbg(&client->dev,
315 "%s: i2c read at address 0x%x failed\n",
323 static int sbs_read_string_data_fallback(struct i2c_client *client, u8 address, char *values)
325 struct sbs_info *chip = i2c_get_clientdata(client);
326 s32 ret = 0, block_length = 0;
327 int retries_length, retries_block;
328 u8 block_buffer[I2C_SMBUS_BLOCK_MAX + 1];
330 retries_length = chip->i2c_retry_count;
331 retries_block = chip->i2c_retry_count;
333 dev_warn_once(&client->dev, "I2C adapter does not support I2C_FUNC_SMBUS_READ_BLOCK_DATA.\n"
334 "Fallback method does not support PEC.\n");
336 /* Adapter needs to support these two functions */
337 if (!i2c_check_functionality(client->adapter,
338 I2C_FUNC_SMBUS_BYTE_DATA |
339 I2C_FUNC_SMBUS_I2C_BLOCK)){
343 /* Get the length of block data */
344 while (retries_length > 0) {
345 ret = i2c_smbus_read_byte_data(client, address);
352 dev_dbg(&client->dev,
353 "%s: i2c read at address 0x%x failed\n",
358 /* block_length does not include NULL terminator */
360 if (block_length > I2C_SMBUS_BLOCK_MAX) {
361 dev_err(&client->dev,
362 "%s: Returned block_length is longer than 0x%x\n",
363 __func__, I2C_SMBUS_BLOCK_MAX);
367 /* Get the block data */
368 while (retries_block > 0) {
369 ret = i2c_smbus_read_i2c_block_data(
371 block_length + 1, block_buffer);
378 dev_dbg(&client->dev,
379 "%s: i2c read at address 0x%x failed\n",
384 /* block_buffer[0] == block_length */
385 memcpy(values, block_buffer + 1, block_length);
386 values[block_length] = '\0';
391 static int sbs_read_string_data(struct i2c_client *client, u8 address, char *values)
393 struct sbs_info *chip = i2c_get_clientdata(client);
394 int retries = chip->i2c_retry_count;
397 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_READ_BLOCK_DATA)) {
398 bool pec = client->flags & I2C_CLIENT_PEC;
399 client->flags &= ~I2C_CLIENT_PEC;
400 ret = sbs_read_string_data_fallback(client, address, values);
402 client->flags |= I2C_CLIENT_PEC;
406 while (retries > 0) {
407 ret = i2c_smbus_read_block_data(client, address, values);
414 dev_dbg(&client->dev, "failed to read block 0x%x: %d\n", address, ret);
418 /* add string termination */
423 static int sbs_write_word_data(struct i2c_client *client, u8 address,
426 struct sbs_info *chip = i2c_get_clientdata(client);
427 int retries = chip->i2c_retry_count;
430 while (retries > 0) {
431 ret = i2c_smbus_write_word_data(client, address, value);
438 dev_dbg(&client->dev,
439 "%s: i2c write to address 0x%x failed\n",
447 static int sbs_status_correct(struct i2c_client *client, int *intval)
451 ret = sbs_read_word_data(client, sbs_data[REG_CURRENT_NOW].addr);
457 /* Not drawing current -> not charging (i.e. idle) */
458 if (*intval != POWER_SUPPLY_STATUS_FULL && ret == 0)
459 *intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
461 if (*intval == POWER_SUPPLY_STATUS_FULL) {
462 /* Drawing or providing current when full */
464 *intval = POWER_SUPPLY_STATUS_CHARGING;
466 *intval = POWER_SUPPLY_STATUS_DISCHARGING;
472 static bool sbs_bat_needs_calibration(struct i2c_client *client)
476 ret = sbs_read_word_data(client, sbs_data[REG_BATTERY_MODE].addr);
480 return !!(ret & BIT(7));
483 static int sbs_get_ti_battery_presence_and_health(
484 struct i2c_client *client, enum power_supply_property psp,
485 union power_supply_propval *val)
490 * Write to ManufacturerAccess with ManufacturerAccess command
491 * and then read the status.
493 ret = sbs_write_word_data(client, sbs_data[REG_MANUFACTURER_DATA].addr,
494 MANUFACTURER_ACCESS_STATUS);
496 if (psp == POWER_SUPPLY_PROP_PRESENT)
497 val->intval = 0; /* battery removed */
501 ret = sbs_read_word_data(client, sbs_data[REG_MANUFACTURER_DATA].addr);
503 if (psp == POWER_SUPPLY_PROP_PRESENT)
504 val->intval = 0; /* battery removed */
508 if (ret < sbs_data[REG_MANUFACTURER_DATA].min_value ||
509 ret > sbs_data[REG_MANUFACTURER_DATA].max_value) {
514 /* Mask the upper nibble of 2nd byte and
515 * lower byte of response then
516 * shift the result by 8 to get status*/
519 if (psp == POWER_SUPPLY_PROP_PRESENT) {
521 /* battery removed */
525 } else if (psp == POWER_SUPPLY_PROP_HEALTH) {
527 val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
528 else if (ret == 0x0B)
529 val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
530 else if (ret == 0x0C)
531 val->intval = POWER_SUPPLY_HEALTH_DEAD;
532 else if (sbs_bat_needs_calibration(client))
533 val->intval = POWER_SUPPLY_HEALTH_CALIBRATION_REQUIRED;
535 val->intval = POWER_SUPPLY_HEALTH_GOOD;
541 static int sbs_get_battery_presence_and_health(
542 struct i2c_client *client, enum power_supply_property psp,
543 union power_supply_propval *val)
545 struct sbs_info *chip = i2c_get_clientdata(client);
548 if (chip->flags & SBS_FLAGS_TI_BQ20ZX5)
549 return sbs_get_ti_battery_presence_and_health(client, psp, val);
551 /* Dummy command; if it succeeds, battery is present. */
552 ret = sbs_read_word_data(client, sbs_data[REG_STATUS].addr);
554 if (ret < 0) { /* battery not present*/
555 if (psp == POWER_SUPPLY_PROP_PRESENT) {
562 if (psp == POWER_SUPPLY_PROP_PRESENT)
563 val->intval = 1; /* battery present */
564 else { /* POWER_SUPPLY_PROP_HEALTH */
565 if (sbs_bat_needs_calibration(client)) {
566 val->intval = POWER_SUPPLY_HEALTH_CALIBRATION_REQUIRED;
568 /* SBS spec doesn't have a general health command. */
569 val->intval = POWER_SUPPLY_HEALTH_UNKNOWN;
576 static int sbs_get_battery_property(struct i2c_client *client,
577 int reg_offset, enum power_supply_property psp,
578 union power_supply_propval *val)
580 struct sbs_info *chip = i2c_get_clientdata(client);
583 ret = sbs_read_word_data(client, sbs_data[reg_offset].addr);
587 /* returned values are 16 bit */
588 if (sbs_data[reg_offset].min_value < 0)
591 if (ret >= sbs_data[reg_offset].min_value &&
592 ret <= sbs_data[reg_offset].max_value) {
594 if (psp == POWER_SUPPLY_PROP_CAPACITY_LEVEL) {
595 if (!(ret & BATTERY_INITIALIZED))
597 POWER_SUPPLY_CAPACITY_LEVEL_UNKNOWN;
598 else if (ret & BATTERY_FULL_CHARGED)
600 POWER_SUPPLY_CAPACITY_LEVEL_FULL;
601 else if (ret & BATTERY_FULL_DISCHARGED)
603 POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
606 POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
608 } else if (psp != POWER_SUPPLY_PROP_STATUS) {
612 if (ret & BATTERY_FULL_CHARGED)
613 val->intval = POWER_SUPPLY_STATUS_FULL;
614 else if (ret & BATTERY_DISCHARGING)
615 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
617 val->intval = POWER_SUPPLY_STATUS_CHARGING;
619 sbs_status_correct(client, &val->intval);
621 if (chip->poll_time == 0)
622 chip->last_state = val->intval;
623 else if (chip->last_state != val->intval) {
624 cancel_delayed_work_sync(&chip->work);
625 power_supply_changed(chip->power_supply);
629 if (psp == POWER_SUPPLY_PROP_STATUS)
630 val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
631 else if (psp == POWER_SUPPLY_PROP_CAPACITY)
632 /* sbs spec says that this can be >100 %
633 * even if max value is 100 %
635 val->intval = min(ret, 100);
643 static int sbs_get_battery_string_property(struct i2c_client *client,
644 int reg_offset, enum power_supply_property psp, char *val)
648 ret = sbs_read_string_data(client, sbs_data[reg_offset].addr, val);
656 static void sbs_unit_adjustment(struct i2c_client *client,
657 enum power_supply_property psp, union power_supply_propval *val)
659 #define BASE_UNIT_CONVERSION 1000
660 #define BATTERY_MODE_CAP_MULT_WATT (10 * BASE_UNIT_CONVERSION)
661 #define TIME_UNIT_CONVERSION 60
662 #define TEMP_KELVIN_TO_CELSIUS 2731
664 case POWER_SUPPLY_PROP_ENERGY_NOW:
665 case POWER_SUPPLY_PROP_ENERGY_FULL:
666 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
667 /* sbs provides energy in units of 10mWh.
670 val->intval *= BATTERY_MODE_CAP_MULT_WATT;
673 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
674 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
675 case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
676 case POWER_SUPPLY_PROP_CURRENT_NOW:
677 case POWER_SUPPLY_PROP_CURRENT_AVG:
678 case POWER_SUPPLY_PROP_CHARGE_NOW:
679 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
680 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
681 case POWER_SUPPLY_PROP_CHARGE_FULL:
682 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
683 val->intval *= BASE_UNIT_CONVERSION;
686 case POWER_SUPPLY_PROP_TEMP:
687 /* sbs provides battery temperature in 0.1K
688 * so convert it to 0.1°C
690 val->intval -= TEMP_KELVIN_TO_CELSIUS;
693 case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
694 case POWER_SUPPLY_PROP_TIME_TO_FULL_AVG:
695 /* sbs provides time to empty and time to full in minutes.
698 val->intval *= TIME_UNIT_CONVERSION;
702 dev_dbg(&client->dev,
703 "%s: no need for unit conversion %d\n", __func__, psp);
707 static enum sbs_capacity_mode sbs_set_capacity_mode(struct i2c_client *client,
708 enum sbs_capacity_mode mode)
710 int ret, original_val;
712 original_val = sbs_read_word_data(client, BATTERY_MODE_OFFSET);
713 if (original_val < 0)
716 if ((original_val & BATTERY_MODE_CAPACITY_MASK) == mode)
719 if (mode == CAPACITY_MODE_AMPS)
720 ret = original_val & ~BATTERY_MODE_CAPACITY_MASK;
722 ret = original_val | BATTERY_MODE_CAPACITY_MASK;
724 ret = sbs_write_word_data(client, BATTERY_MODE_OFFSET, ret);
728 usleep_range(1000, 2000);
730 return original_val & BATTERY_MODE_CAPACITY_MASK;
733 static int sbs_get_battery_capacity(struct i2c_client *client,
734 int reg_offset, enum power_supply_property psp,
735 union power_supply_propval *val)
738 enum sbs_capacity_mode mode = CAPACITY_MODE_WATTS;
740 if (power_supply_is_amp_property(psp))
741 mode = CAPACITY_MODE_AMPS;
743 mode = sbs_set_capacity_mode(client, mode);
747 ret = sbs_read_word_data(client, sbs_data[reg_offset].addr);
753 ret = sbs_set_capacity_mode(client, mode);
760 static char sbs_serial[5];
761 static int sbs_get_battery_serial_number(struct i2c_client *client,
762 union power_supply_propval *val)
766 ret = sbs_read_word_data(client, sbs_data[REG_SERIAL_NUMBER].addr);
770 sprintf(sbs_serial, "%04x", ret);
771 val->strval = sbs_serial;
776 static int sbs_get_property_index(struct i2c_client *client,
777 enum power_supply_property psp)
780 for (count = 0; count < ARRAY_SIZE(sbs_data); count++)
781 if (psp == sbs_data[count].psp)
784 dev_warn(&client->dev,
785 "%s: Invalid Property - %d\n", __func__, psp);
790 static int sbs_get_chemistry(struct i2c_client *client,
791 union power_supply_propval *val)
793 enum power_supply_property psp = POWER_SUPPLY_PROP_TECHNOLOGY;
796 ret = sbs_get_property_index(client, psp);
800 ret = sbs_get_battery_string_property(client, ret, psp,
805 if (!strncasecmp(chemistry, "LION", 4))
806 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
807 else if (!strncasecmp(chemistry, "LiP", 3))
808 val->intval = POWER_SUPPLY_TECHNOLOGY_LIPO;
809 else if (!strncasecmp(chemistry, "NiCd", 4))
810 val->intval = POWER_SUPPLY_TECHNOLOGY_NiCd;
811 else if (!strncasecmp(chemistry, "NiMH", 4))
812 val->intval = POWER_SUPPLY_TECHNOLOGY_NiMH;
814 val->intval = POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
816 if (val->intval == POWER_SUPPLY_TECHNOLOGY_UNKNOWN)
817 dev_warn(&client->dev, "Unknown chemistry: %s\n", chemistry);
822 static int sbs_get_battery_manufacture_date(struct i2c_client *client,
823 enum power_supply_property psp,
824 union power_supply_propval *val)
827 u16 day, month, year;
829 ret = sbs_read_word_data(client, REG_ADDR_MANUFACTURE_DATE);
833 day = ret & GENMASK(4, 0);
834 month = (ret & GENMASK(8, 5)) >> 5;
835 year = ((ret & GENMASK(15, 9)) >> 9) + 1980;
838 case POWER_SUPPLY_PROP_MANUFACTURE_YEAR:
841 case POWER_SUPPLY_PROP_MANUFACTURE_MONTH:
844 case POWER_SUPPLY_PROP_MANUFACTURE_DAY:
854 static int sbs_get_property(struct power_supply *psy,
855 enum power_supply_property psp,
856 union power_supply_propval *val)
859 struct sbs_info *chip = power_supply_get_drvdata(psy);
860 struct i2c_client *client = chip->client;
862 if (chip->gpio_detect) {
863 ret = gpiod_get_value_cansleep(chip->gpio_detect);
866 if (psp == POWER_SUPPLY_PROP_PRESENT) {
868 sbs_update_presence(chip, ret);
876 case POWER_SUPPLY_PROP_PRESENT:
877 case POWER_SUPPLY_PROP_HEALTH:
878 ret = sbs_get_battery_presence_and_health(client, psp, val);
880 /* this can only be true if no gpio is used */
881 if (psp == POWER_SUPPLY_PROP_PRESENT)
885 case POWER_SUPPLY_PROP_TECHNOLOGY:
886 ret = sbs_get_chemistry(client, val);
890 goto done; /* don't trigger power_supply_changed()! */
892 case POWER_SUPPLY_PROP_ENERGY_NOW:
893 case POWER_SUPPLY_PROP_ENERGY_FULL:
894 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
895 case POWER_SUPPLY_PROP_CHARGE_NOW:
896 case POWER_SUPPLY_PROP_CHARGE_FULL:
897 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
898 ret = sbs_get_property_index(client, psp);
902 /* sbs_get_battery_capacity() will change the battery mode
903 * temporarily to read the requested attribute. Ensure we stay
904 * in the desired mode for the duration of the attribute read.
906 mutex_lock(&chip->mode_lock);
907 ret = sbs_get_battery_capacity(client, ret, psp, val);
908 mutex_unlock(&chip->mode_lock);
911 case POWER_SUPPLY_PROP_SERIAL_NUMBER:
912 ret = sbs_get_battery_serial_number(client, val);
915 case POWER_SUPPLY_PROP_STATUS:
916 case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
917 case POWER_SUPPLY_PROP_CYCLE_COUNT:
918 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
919 case POWER_SUPPLY_PROP_CURRENT_NOW:
920 case POWER_SUPPLY_PROP_CURRENT_AVG:
921 case POWER_SUPPLY_PROP_TEMP:
922 case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
923 case POWER_SUPPLY_PROP_TIME_TO_FULL_AVG:
924 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
925 case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
926 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
927 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
928 case POWER_SUPPLY_PROP_CAPACITY:
929 case POWER_SUPPLY_PROP_CAPACITY_ERROR_MARGIN:
930 ret = sbs_get_property_index(client, psp);
934 ret = sbs_get_battery_property(client, ret, psp, val);
937 case POWER_SUPPLY_PROP_MODEL_NAME:
938 ret = sbs_get_property_index(client, psp);
942 ret = sbs_get_battery_string_property(client, ret, psp,
944 val->strval = model_name;
947 case POWER_SUPPLY_PROP_MANUFACTURER:
948 ret = sbs_get_property_index(client, psp);
952 ret = sbs_get_battery_string_property(client, ret, psp,
954 val->strval = manufacturer;
957 case POWER_SUPPLY_PROP_MANUFACTURE_YEAR:
958 case POWER_SUPPLY_PROP_MANUFACTURE_MONTH:
959 case POWER_SUPPLY_PROP_MANUFACTURE_DAY:
960 ret = sbs_get_battery_manufacture_date(client, psp, val);
964 dev_err(&client->dev,
965 "%s: INVALID property\n", __func__);
969 if (!chip->gpio_detect && chip->is_present != (ret >= 0)) {
970 bool old_present = chip->is_present;
971 union power_supply_propval val;
972 int err = sbs_get_battery_presence_and_health(
973 client, POWER_SUPPLY_PROP_PRESENT, &val);
975 sbs_update_presence(chip, !err && val.intval);
977 if (old_present != chip->is_present)
978 power_supply_changed(chip->power_supply);
983 /* Convert units to match requirements for power supply class */
984 sbs_unit_adjustment(client, psp, val);
985 dev_dbg(&client->dev,
986 "%s: property = %d, value = %x\n", __func__,
988 } else if (!chip->is_present) {
989 /* battery not present, so return NODATA for properties */
995 static void sbs_supply_changed(struct sbs_info *chip)
997 struct power_supply *battery = chip->power_supply;
1000 ret = gpiod_get_value_cansleep(chip->gpio_detect);
1003 sbs_update_presence(chip, ret);
1004 power_supply_changed(battery);
1007 static irqreturn_t sbs_irq(int irq, void *devid)
1009 sbs_supply_changed(devid);
1013 static void sbs_alert(struct i2c_client *client, enum i2c_alert_protocol prot,
1016 sbs_supply_changed(i2c_get_clientdata(client));
1019 static void sbs_external_power_changed(struct power_supply *psy)
1021 struct sbs_info *chip = power_supply_get_drvdata(psy);
1023 /* cancel outstanding work */
1024 cancel_delayed_work_sync(&chip->work);
1026 schedule_delayed_work(&chip->work, HZ);
1027 chip->poll_time = chip->poll_retry_count;
1030 static void sbs_delayed_work(struct work_struct *work)
1032 struct sbs_info *chip;
1035 chip = container_of(work, struct sbs_info, work.work);
1037 ret = sbs_read_word_data(chip->client, sbs_data[REG_STATUS].addr);
1038 /* if the read failed, give up on this work */
1040 chip->poll_time = 0;
1044 if (ret & BATTERY_FULL_CHARGED)
1045 ret = POWER_SUPPLY_STATUS_FULL;
1046 else if (ret & BATTERY_DISCHARGING)
1047 ret = POWER_SUPPLY_STATUS_DISCHARGING;
1049 ret = POWER_SUPPLY_STATUS_CHARGING;
1051 sbs_status_correct(chip->client, &ret);
1053 if (chip->last_state != ret) {
1054 chip->poll_time = 0;
1055 power_supply_changed(chip->power_supply);
1058 if (chip->poll_time > 0) {
1059 schedule_delayed_work(&chip->work, HZ);
1065 static const struct power_supply_desc sbs_default_desc = {
1066 .type = POWER_SUPPLY_TYPE_BATTERY,
1067 .properties = sbs_properties,
1068 .num_properties = ARRAY_SIZE(sbs_properties),
1069 .get_property = sbs_get_property,
1070 .external_power_changed = sbs_external_power_changed,
1073 static int sbs_probe(struct i2c_client *client)
1075 struct sbs_info *chip;
1076 struct power_supply_desc *sbs_desc;
1077 struct sbs_platform_data *pdata = client->dev.platform_data;
1078 struct power_supply_config psy_cfg = {};
1082 sbs_desc = devm_kmemdup(&client->dev, &sbs_default_desc,
1083 sizeof(*sbs_desc), GFP_KERNEL);
1087 sbs_desc->name = devm_kasprintf(&client->dev, GFP_KERNEL, "sbs-%s",
1088 dev_name(&client->dev));
1089 if (!sbs_desc->name)
1092 chip = devm_kzalloc(&client->dev, sizeof(struct sbs_info), GFP_KERNEL);
1096 chip->flags = (u32)(uintptr_t)device_get_match_data(&client->dev);
1097 chip->client = client;
1098 psy_cfg.of_node = client->dev.of_node;
1099 psy_cfg.drv_data = chip;
1100 chip->last_state = POWER_SUPPLY_STATUS_UNKNOWN;
1101 mutex_init(&chip->mode_lock);
1103 /* use pdata if available, fall back to DT properties,
1104 * or hardcoded defaults if not
1106 rc = device_property_read_u32(&client->dev, "sbs,i2c-retry-count",
1107 &chip->i2c_retry_count);
1109 chip->i2c_retry_count = 0;
1111 rc = device_property_read_u32(&client->dev, "sbs,poll-retry-count",
1112 &chip->poll_retry_count);
1114 chip->poll_retry_count = 0;
1117 chip->poll_retry_count = pdata->poll_retry_count;
1118 chip->i2c_retry_count = pdata->i2c_retry_count;
1120 chip->i2c_retry_count = chip->i2c_retry_count + 1;
1122 chip->charger_broadcasts = !device_property_read_bool(&client->dev,
1123 "sbs,disable-charger-broadcasts");
1125 chip->gpio_detect = devm_gpiod_get_optional(&client->dev,
1126 "sbs,battery-detect", GPIOD_IN);
1127 if (IS_ERR(chip->gpio_detect))
1128 return dev_err_probe(&client->dev, PTR_ERR(chip->gpio_detect),
1129 "Failed to get gpio\n");
1131 i2c_set_clientdata(client, chip);
1133 if (!chip->gpio_detect)
1136 irq = gpiod_to_irq(chip->gpio_detect);
1138 dev_warn(&client->dev, "Failed to get gpio as irq: %d\n", irq);
1142 rc = devm_request_threaded_irq(&client->dev, irq, NULL, sbs_irq,
1143 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
1144 dev_name(&client->dev), chip);
1146 dev_warn(&client->dev, "Failed to request irq: %d\n", rc);
1152 * Before we register, we might need to make sure we can actually talk
1155 if (!(force_load || chip->gpio_detect)) {
1156 union power_supply_propval val;
1158 rc = sbs_get_battery_presence_and_health(
1159 client, POWER_SUPPLY_PROP_PRESENT, &val);
1160 if (rc < 0 || !val.intval)
1161 return dev_err_probe(&client->dev, -ENODEV,
1162 "Failed to get present status\n");
1165 rc = devm_delayed_work_autocancel(&client->dev, &chip->work,
1170 chip->power_supply = devm_power_supply_register(&client->dev, sbs_desc,
1172 if (IS_ERR(chip->power_supply))
1173 return dev_err_probe(&client->dev, PTR_ERR(chip->power_supply),
1174 "Failed to register power supply\n");
1176 dev_info(&client->dev,
1177 "%s: battery gas gauge device registered\n", client->name);
1182 #if defined CONFIG_PM_SLEEP
1184 static int sbs_suspend(struct device *dev)
1186 struct i2c_client *client = to_i2c_client(dev);
1187 struct sbs_info *chip = i2c_get_clientdata(client);
1190 if (chip->poll_time > 0)
1191 cancel_delayed_work_sync(&chip->work);
1193 if (chip->flags & SBS_FLAGS_TI_BQ20ZX5) {
1194 /* Write to manufacturer access with sleep command. */
1195 ret = sbs_write_word_data(client,
1196 sbs_data[REG_MANUFACTURER_DATA].addr,
1197 MANUFACTURER_ACCESS_SLEEP);
1198 if (chip->is_present && ret < 0)
1205 static SIMPLE_DEV_PM_OPS(sbs_pm_ops, sbs_suspend, NULL);
1206 #define SBS_PM_OPS (&sbs_pm_ops)
1209 #define SBS_PM_OPS NULL
1212 static const struct i2c_device_id sbs_id[] = {
1215 { "sbs-battery", 1 },
1218 MODULE_DEVICE_TABLE(i2c, sbs_id);
1220 static const struct of_device_id sbs_dt_ids[] = {
1221 { .compatible = "sbs,sbs-battery" },
1223 .compatible = "ti,bq20z65",
1224 .data = (void *)SBS_FLAGS_TI_BQ20ZX5,
1227 .compatible = "ti,bq20z75",
1228 .data = (void *)SBS_FLAGS_TI_BQ20ZX5,
1232 MODULE_DEVICE_TABLE(of, sbs_dt_ids);
1234 static struct i2c_driver sbs_battery_driver = {
1235 .probe_new = sbs_probe,
1239 .name = "sbs-battery",
1240 .of_match_table = sbs_dt_ids,
1244 module_i2c_driver(sbs_battery_driver);
1246 MODULE_DESCRIPTION("SBS battery monitor driver");
1247 MODULE_LICENSE("GPL");
1249 module_param(force_load, bool, 0444);
1250 MODULE_PARM_DESC(force_load,
1251 "Attempt to load the driver even if no battery is connected");