help
Say Y to enable support for battery measured by WM97xx aux port.
-config BATTERY_BQ20Z75
- tristate "TI BQ20z75 gas gauge"
+config BATTERY_SBS
+ tristate "SBS Compliant gas gauge"
depends on I2C
help
- Say Y to include support for TI BQ20z75 SBS-compliant
- gas gauge and protection IC.
+ Say Y to include support for SBS battery driver for SBS-compliant
+ gas gauges.
config BATTERY_BQ27x00
tristate "BQ27x00 battery driver"
obj-$(CONFIG_BATTERY_TOSA) += tosa_battery.o
obj-$(CONFIG_BATTERY_COLLIE) += collie_battery.o
obj-$(CONFIG_BATTERY_WM97XX) += wm97xx_battery.o
-obj-$(CONFIG_BATTERY_BQ20Z75) += bq20z75.o
+obj-$(CONFIG_BATTERY_SBS) += sbs-battery.o
obj-$(CONFIG_BATTERY_BQ27x00) += bq27x00_battery.o
obj-$(CONFIG_BATTERY_DA9030) += da9030_battery.o
obj-$(CONFIG_BATTERY_MAX17040) += max17040_battery.o
+++ /dev/null
-/*
- * Gas Gauge driver for TI's BQ20Z75
- *
- * Copyright (c) 2010, NVIDIA Corporation.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
- */
-
-#include <linux/init.h>
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/err.h>
-#include <linux/power_supply.h>
-#include <linux/i2c.h>
-#include <linux/slab.h>
-#include <linux/interrupt.h>
-#include <linux/gpio.h>
-
-#include <linux/power/bq20z75.h>
-
-enum {
- REG_MANUFACTURER_DATA,
- REG_TEMPERATURE,
- REG_VOLTAGE,
- REG_CURRENT,
- REG_CAPACITY,
- REG_TIME_TO_EMPTY,
- REG_TIME_TO_FULL,
- REG_STATUS,
- REG_CYCLE_COUNT,
- REG_SERIAL_NUMBER,
- REG_REMAINING_CAPACITY,
- REG_REMAINING_CAPACITY_CHARGE,
- REG_FULL_CHARGE_CAPACITY,
- REG_FULL_CHARGE_CAPACITY_CHARGE,
- REG_DESIGN_CAPACITY,
- REG_DESIGN_CAPACITY_CHARGE,
- REG_DESIGN_VOLTAGE,
-};
-
-/* Battery Mode defines */
-#define BATTERY_MODE_OFFSET 0x03
-#define BATTERY_MODE_MASK 0x8000
-enum bq20z75_battery_mode {
- BATTERY_MODE_AMPS,
- BATTERY_MODE_WATTS
-};
-
-/* manufacturer access defines */
-#define MANUFACTURER_ACCESS_STATUS 0x0006
-#define MANUFACTURER_ACCESS_SLEEP 0x0011
-
-/* battery status value bits */
-#define BATTERY_DISCHARGING 0x40
-#define BATTERY_FULL_CHARGED 0x20
-#define BATTERY_FULL_DISCHARGED 0x10
-
-#define BQ20Z75_DATA(_psp, _addr, _min_value, _max_value) { \
- .psp = _psp, \
- .addr = _addr, \
- .min_value = _min_value, \
- .max_value = _max_value, \
-}
-
-static const struct bq20z75_device_data {
- enum power_supply_property psp;
- u8 addr;
- int min_value;
- int max_value;
-} bq20z75_data[] = {
- [REG_MANUFACTURER_DATA] =
- BQ20Z75_DATA(POWER_SUPPLY_PROP_PRESENT, 0x00, 0, 65535),
- [REG_TEMPERATURE] =
- BQ20Z75_DATA(POWER_SUPPLY_PROP_TEMP, 0x08, 0, 65535),
- [REG_VOLTAGE] =
- BQ20Z75_DATA(POWER_SUPPLY_PROP_VOLTAGE_NOW, 0x09, 0, 20000),
- [REG_CURRENT] =
- BQ20Z75_DATA(POWER_SUPPLY_PROP_CURRENT_NOW, 0x0A, -32768,
- 32767),
- [REG_CAPACITY] =
- BQ20Z75_DATA(POWER_SUPPLY_PROP_CAPACITY, 0x0E, 0, 100),
- [REG_REMAINING_CAPACITY] =
- BQ20Z75_DATA(POWER_SUPPLY_PROP_ENERGY_NOW, 0x0F, 0, 65535),
- [REG_REMAINING_CAPACITY_CHARGE] =
- BQ20Z75_DATA(POWER_SUPPLY_PROP_CHARGE_NOW, 0x0F, 0, 65535),
- [REG_FULL_CHARGE_CAPACITY] =
- BQ20Z75_DATA(POWER_SUPPLY_PROP_ENERGY_FULL, 0x10, 0, 65535),
- [REG_FULL_CHARGE_CAPACITY_CHARGE] =
- BQ20Z75_DATA(POWER_SUPPLY_PROP_CHARGE_FULL, 0x10, 0, 65535),
- [REG_TIME_TO_EMPTY] =
- BQ20Z75_DATA(POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG, 0x12, 0,
- 65535),
- [REG_TIME_TO_FULL] =
- BQ20Z75_DATA(POWER_SUPPLY_PROP_TIME_TO_FULL_AVG, 0x13, 0,
- 65535),
- [REG_STATUS] =
- BQ20Z75_DATA(POWER_SUPPLY_PROP_STATUS, 0x16, 0, 65535),
- [REG_CYCLE_COUNT] =
- BQ20Z75_DATA(POWER_SUPPLY_PROP_CYCLE_COUNT, 0x17, 0, 65535),
- [REG_DESIGN_CAPACITY] =
- BQ20Z75_DATA(POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN, 0x18, 0,
- 65535),
- [REG_DESIGN_CAPACITY_CHARGE] =
- BQ20Z75_DATA(POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, 0x18, 0,
- 65535),
- [REG_DESIGN_VOLTAGE] =
- BQ20Z75_DATA(POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN, 0x19, 0,
- 65535),
- [REG_SERIAL_NUMBER] =
- BQ20Z75_DATA(POWER_SUPPLY_PROP_SERIAL_NUMBER, 0x1C, 0, 65535),
-};
-
-static enum power_supply_property bq20z75_properties[] = {
- POWER_SUPPLY_PROP_STATUS,
- POWER_SUPPLY_PROP_HEALTH,
- POWER_SUPPLY_PROP_PRESENT,
- POWER_SUPPLY_PROP_TECHNOLOGY,
- POWER_SUPPLY_PROP_CYCLE_COUNT,
- POWER_SUPPLY_PROP_VOLTAGE_NOW,
- POWER_SUPPLY_PROP_CURRENT_NOW,
- POWER_SUPPLY_PROP_CAPACITY,
- POWER_SUPPLY_PROP_TEMP,
- POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
- POWER_SUPPLY_PROP_TIME_TO_FULL_AVG,
- POWER_SUPPLY_PROP_SERIAL_NUMBER,
- POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
- POWER_SUPPLY_PROP_ENERGY_NOW,
- POWER_SUPPLY_PROP_ENERGY_FULL,
- POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
- POWER_SUPPLY_PROP_CHARGE_NOW,
- POWER_SUPPLY_PROP_CHARGE_FULL,
- POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
-};
-
-struct bq20z75_info {
- struct i2c_client *client;
- struct power_supply power_supply;
- struct bq20z75_platform_data *pdata;
- bool is_present;
- bool gpio_detect;
- bool enable_detection;
- int irq;
- int last_state;
- int poll_time;
- struct delayed_work work;
- int ignore_changes;
-};
-
-static int bq20z75_read_word_data(struct i2c_client *client, u8 address)
-{
- struct bq20z75_info *bq20z75_device = i2c_get_clientdata(client);
- s32 ret = 0;
- int retries = 1;
-
- if (bq20z75_device->pdata)
- retries = max(bq20z75_device->pdata->i2c_retry_count + 1, 1);
-
- while (retries > 0) {
- ret = i2c_smbus_read_word_data(client, address);
- if (ret >= 0)
- break;
- retries--;
- }
-
- if (ret < 0) {
- dev_dbg(&client->dev,
- "%s: i2c read at address 0x%x failed\n",
- __func__, address);
- return ret;
- }
-
- return le16_to_cpu(ret);
-}
-
-static int bq20z75_write_word_data(struct i2c_client *client, u8 address,
- u16 value)
-{
- struct bq20z75_info *bq20z75_device = i2c_get_clientdata(client);
- s32 ret = 0;
- int retries = 1;
-
- if (bq20z75_device->pdata)
- retries = max(bq20z75_device->pdata->i2c_retry_count + 1, 1);
-
- while (retries > 0) {
- ret = i2c_smbus_write_word_data(client, address,
- le16_to_cpu(value));
- if (ret >= 0)
- break;
- retries--;
- }
-
- if (ret < 0) {
- dev_dbg(&client->dev,
- "%s: i2c write to address 0x%x failed\n",
- __func__, address);
- return ret;
- }
-
- return 0;
-}
-
-static int bq20z75_get_battery_presence_and_health(
- struct i2c_client *client, enum power_supply_property psp,
- union power_supply_propval *val)
-{
- s32 ret;
- struct bq20z75_info *bq20z75_device = i2c_get_clientdata(client);
-
- if (psp == POWER_SUPPLY_PROP_PRESENT &&
- bq20z75_device->gpio_detect) {
- ret = gpio_get_value(
- bq20z75_device->pdata->battery_detect);
- if (ret == bq20z75_device->pdata->battery_detect_present)
- val->intval = 1;
- else
- val->intval = 0;
- bq20z75_device->is_present = val->intval;
- return ret;
- }
-
- /* Write to ManufacturerAccess with
- * ManufacturerAccess command and then
- * read the status */
- ret = bq20z75_write_word_data(client,
- bq20z75_data[REG_MANUFACTURER_DATA].addr,
- MANUFACTURER_ACCESS_STATUS);
- if (ret < 0) {
- if (psp == POWER_SUPPLY_PROP_PRESENT)
- val->intval = 0; /* battery removed */
- return ret;
- }
-
- ret = bq20z75_read_word_data(client,
- bq20z75_data[REG_MANUFACTURER_DATA].addr);
- if (ret < 0)
- return ret;
-
- if (ret < bq20z75_data[REG_MANUFACTURER_DATA].min_value ||
- ret > bq20z75_data[REG_MANUFACTURER_DATA].max_value) {
- val->intval = 0;
- return 0;
- }
-
- /* Mask the upper nibble of 2nd byte and
- * lower byte of response then
- * shift the result by 8 to get status*/
- ret &= 0x0F00;
- ret >>= 8;
- if (psp == POWER_SUPPLY_PROP_PRESENT) {
- if (ret == 0x0F)
- /* battery removed */
- val->intval = 0;
- else
- val->intval = 1;
- } else if (psp == POWER_SUPPLY_PROP_HEALTH) {
- if (ret == 0x09)
- val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
- else if (ret == 0x0B)
- val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
- else if (ret == 0x0C)
- val->intval = POWER_SUPPLY_HEALTH_DEAD;
- else
- val->intval = POWER_SUPPLY_HEALTH_GOOD;
- }
-
- return 0;
-}
-
-static int bq20z75_get_battery_property(struct i2c_client *client,
- int reg_offset, enum power_supply_property psp,
- union power_supply_propval *val)
-{
- struct bq20z75_info *bq20z75_device = i2c_get_clientdata(client);
- s32 ret;
-
- ret = bq20z75_read_word_data(client,
- bq20z75_data[reg_offset].addr);
- if (ret < 0)
- return ret;
-
- /* returned values are 16 bit */
- if (bq20z75_data[reg_offset].min_value < 0)
- ret = (s16)ret;
-
- if (ret >= bq20z75_data[reg_offset].min_value &&
- ret <= bq20z75_data[reg_offset].max_value) {
- val->intval = ret;
- if (psp != POWER_SUPPLY_PROP_STATUS)
- return 0;
-
- if (ret & BATTERY_FULL_CHARGED)
- val->intval = POWER_SUPPLY_STATUS_FULL;
- else if (ret & BATTERY_FULL_DISCHARGED)
- val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
- else if (ret & BATTERY_DISCHARGING)
- val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
- else
- val->intval = POWER_SUPPLY_STATUS_CHARGING;
-
- if (bq20z75_device->poll_time == 0)
- bq20z75_device->last_state = val->intval;
- else if (bq20z75_device->last_state != val->intval) {
- cancel_delayed_work_sync(&bq20z75_device->work);
- power_supply_changed(&bq20z75_device->power_supply);
- bq20z75_device->poll_time = 0;
- }
- } else {
- if (psp == POWER_SUPPLY_PROP_STATUS)
- val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
- else
- val->intval = 0;
- }
-
- return 0;
-}
-
-static void bq20z75_unit_adjustment(struct i2c_client *client,
- enum power_supply_property psp, union power_supply_propval *val)
-{
-#define BASE_UNIT_CONVERSION 1000
-#define BATTERY_MODE_CAP_MULT_WATT (10 * BASE_UNIT_CONVERSION)
-#define TIME_UNIT_CONVERSION 60
-#define TEMP_KELVIN_TO_CELSIUS 2731
- switch (psp) {
- case POWER_SUPPLY_PROP_ENERGY_NOW:
- case POWER_SUPPLY_PROP_ENERGY_FULL:
- case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
- /* bq20z75 provides energy in units of 10mWh.
- * Convert to µWh
- */
- val->intval *= BATTERY_MODE_CAP_MULT_WATT;
- break;
-
- case POWER_SUPPLY_PROP_VOLTAGE_NOW:
- case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
- case POWER_SUPPLY_PROP_CURRENT_NOW:
- case POWER_SUPPLY_PROP_CHARGE_NOW:
- case POWER_SUPPLY_PROP_CHARGE_FULL:
- case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
- val->intval *= BASE_UNIT_CONVERSION;
- break;
-
- case POWER_SUPPLY_PROP_TEMP:
- /* bq20z75 provides battery temperature in 0.1K
- * so convert it to 0.1°C
- */
- val->intval -= TEMP_KELVIN_TO_CELSIUS;
- break;
-
- case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
- case POWER_SUPPLY_PROP_TIME_TO_FULL_AVG:
- /* bq20z75 provides time to empty and time to full in minutes.
- * Convert to seconds
- */
- val->intval *= TIME_UNIT_CONVERSION;
- break;
-
- default:
- dev_dbg(&client->dev,
- "%s: no need for unit conversion %d\n", __func__, psp);
- }
-}
-
-static enum bq20z75_battery_mode
-bq20z75_set_battery_mode(struct i2c_client *client,
- enum bq20z75_battery_mode mode)
-{
- int ret, original_val;
-
- original_val = bq20z75_read_word_data(client, BATTERY_MODE_OFFSET);
- if (original_val < 0)
- return original_val;
-
- if ((original_val & BATTERY_MODE_MASK) == mode)
- return mode;
-
- if (mode == BATTERY_MODE_AMPS)
- ret = original_val & ~BATTERY_MODE_MASK;
- else
- ret = original_val | BATTERY_MODE_MASK;
-
- ret = bq20z75_write_word_data(client, BATTERY_MODE_OFFSET, ret);
- if (ret < 0)
- return ret;
-
- return original_val & BATTERY_MODE_MASK;
-}
-
-static int bq20z75_get_battery_capacity(struct i2c_client *client,
- int reg_offset, enum power_supply_property psp,
- union power_supply_propval *val)
-{
- s32 ret;
- enum bq20z75_battery_mode mode = BATTERY_MODE_WATTS;
-
- if (power_supply_is_amp_property(psp))
- mode = BATTERY_MODE_AMPS;
-
- mode = bq20z75_set_battery_mode(client, mode);
- if (mode < 0)
- return mode;
-
- ret = bq20z75_read_word_data(client, bq20z75_data[reg_offset].addr);
- if (ret < 0)
- return ret;
-
- if (psp == POWER_SUPPLY_PROP_CAPACITY) {
- /* bq20z75 spec says that this can be >100 %
- * even if max value is 100 % */
- val->intval = min(ret, 100);
- } else
- val->intval = ret;
-
- ret = bq20z75_set_battery_mode(client, mode);
- if (ret < 0)
- return ret;
-
- return 0;
-}
-
-static char bq20z75_serial[5];
-static int bq20z75_get_battery_serial_number(struct i2c_client *client,
- union power_supply_propval *val)
-{
- int ret;
-
- ret = bq20z75_read_word_data(client,
- bq20z75_data[REG_SERIAL_NUMBER].addr);
- if (ret < 0)
- return ret;
-
- ret = sprintf(bq20z75_serial, "%04x", ret);
- val->strval = bq20z75_serial;
-
- return 0;
-}
-
-static int bq20z75_get_property_index(struct i2c_client *client,
- enum power_supply_property psp)
-{
- int count;
- for (count = 0; count < ARRAY_SIZE(bq20z75_data); count++)
- if (psp == bq20z75_data[count].psp)
- return count;
-
- dev_warn(&client->dev,
- "%s: Invalid Property - %d\n", __func__, psp);
-
- return -EINVAL;
-}
-
-static int bq20z75_get_property(struct power_supply *psy,
- enum power_supply_property psp,
- union power_supply_propval *val)
-{
- int ret = 0;
- struct bq20z75_info *bq20z75_device = container_of(psy,
- struct bq20z75_info, power_supply);
- struct i2c_client *client = bq20z75_device->client;
-
- switch (psp) {
- case POWER_SUPPLY_PROP_PRESENT:
- case POWER_SUPPLY_PROP_HEALTH:
- ret = bq20z75_get_battery_presence_and_health(client, psp, val);
- if (psp == POWER_SUPPLY_PROP_PRESENT)
- return 0;
- break;
-
- case POWER_SUPPLY_PROP_TECHNOLOGY:
- val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
- break;
-
- case POWER_SUPPLY_PROP_ENERGY_NOW:
- case POWER_SUPPLY_PROP_ENERGY_FULL:
- case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
- case POWER_SUPPLY_PROP_CHARGE_NOW:
- case POWER_SUPPLY_PROP_CHARGE_FULL:
- case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
- case POWER_SUPPLY_PROP_CAPACITY:
- ret = bq20z75_get_property_index(client, psp);
- if (ret < 0)
- break;
-
- ret = bq20z75_get_battery_capacity(client, ret, psp, val);
- break;
-
- case POWER_SUPPLY_PROP_SERIAL_NUMBER:
- ret = bq20z75_get_battery_serial_number(client, val);
- break;
-
- case POWER_SUPPLY_PROP_STATUS:
- case POWER_SUPPLY_PROP_CYCLE_COUNT:
- case POWER_SUPPLY_PROP_VOLTAGE_NOW:
- case POWER_SUPPLY_PROP_CURRENT_NOW:
- case POWER_SUPPLY_PROP_TEMP:
- case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
- case POWER_SUPPLY_PROP_TIME_TO_FULL_AVG:
- case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
- ret = bq20z75_get_property_index(client, psp);
- if (ret < 0)
- break;
-
- ret = bq20z75_get_battery_property(client, ret, psp, val);
- break;
-
- default:
- dev_err(&client->dev,
- "%s: INVALID property\n", __func__);
- return -EINVAL;
- }
-
- if (!bq20z75_device->enable_detection)
- goto done;
-
- if (!bq20z75_device->gpio_detect &&
- bq20z75_device->is_present != (ret >= 0)) {
- bq20z75_device->is_present = (ret >= 0);
- power_supply_changed(&bq20z75_device->power_supply);
- }
-
-done:
- if (!ret) {
- /* Convert units to match requirements for power supply class */
- bq20z75_unit_adjustment(client, psp, val);
- }
-
- dev_dbg(&client->dev,
- "%s: property = %d, value = %x\n", __func__, psp, val->intval);
-
- if (ret && bq20z75_device->is_present)
- return ret;
-
- /* battery not present, so return NODATA for properties */
- if (ret)
- return -ENODATA;
-
- return 0;
-}
-
-static irqreturn_t bq20z75_irq(int irq, void *devid)
-{
- struct power_supply *battery = devid;
-
- power_supply_changed(battery);
-
- return IRQ_HANDLED;
-}
-
-static void bq20z75_external_power_changed(struct power_supply *psy)
-{
- struct bq20z75_info *bq20z75_device;
-
- bq20z75_device = container_of(psy, struct bq20z75_info, power_supply);
-
- if (bq20z75_device->ignore_changes > 0) {
- bq20z75_device->ignore_changes--;
- return;
- }
-
- /* cancel outstanding work */
- cancel_delayed_work_sync(&bq20z75_device->work);
-
- schedule_delayed_work(&bq20z75_device->work, HZ);
- bq20z75_device->poll_time = bq20z75_device->pdata->poll_retry_count;
-}
-
-static void bq20z75_delayed_work(struct work_struct *work)
-{
- struct bq20z75_info *bq20z75_device;
- s32 ret;
-
- bq20z75_device = container_of(work, struct bq20z75_info, work.work);
-
- ret = bq20z75_read_word_data(bq20z75_device->client,
- bq20z75_data[REG_STATUS].addr);
- /* if the read failed, give up on this work */
- if (ret < 0) {
- bq20z75_device->poll_time = 0;
- return;
- }
-
- if (ret & BATTERY_FULL_CHARGED)
- ret = POWER_SUPPLY_STATUS_FULL;
- else if (ret & BATTERY_FULL_DISCHARGED)
- ret = POWER_SUPPLY_STATUS_NOT_CHARGING;
- else if (ret & BATTERY_DISCHARGING)
- ret = POWER_SUPPLY_STATUS_DISCHARGING;
- else
- ret = POWER_SUPPLY_STATUS_CHARGING;
-
- if (bq20z75_device->last_state != ret) {
- bq20z75_device->poll_time = 0;
- power_supply_changed(&bq20z75_device->power_supply);
- return;
- }
- if (bq20z75_device->poll_time > 0) {
- schedule_delayed_work(&bq20z75_device->work, HZ);
- bq20z75_device->poll_time--;
- return;
- }
-}
-
-#if defined(CONFIG_OF)
-
-#include <linux/of_device.h>
-#include <linux/of_gpio.h>
-
-static const struct of_device_id bq20z75_dt_ids[] = {
- { .compatible = "ti,bq20z75" },
- { }
-};
-MODULE_DEVICE_TABLE(i2c, bq20z75_dt_ids);
-
-static struct bq20z75_platform_data *bq20z75_of_populate_pdata(
- struct i2c_client *client)
-{
- struct device_node *of_node = client->dev.of_node;
- struct bq20z75_platform_data *pdata = client->dev.platform_data;
- enum of_gpio_flags gpio_flags;
- int rc;
- u32 prop;
-
- /* verify this driver matches this device */
- if (!of_node)
- return NULL;
-
- /* if platform data is set, honor it */
- if (pdata)
- return pdata;
-
- /* first make sure at least one property is set, otherwise
- * it won't change behavior from running without pdata.
- */
- if (!of_get_property(of_node, "ti,i2c-retry-count", NULL) &&
- !of_get_property(of_node, "ti,poll-retry-count", NULL) &&
- !of_get_property(of_node, "ti,battery-detect-gpios", NULL))
- goto of_out;
-
- pdata = devm_kzalloc(&client->dev, sizeof(struct bq20z75_platform_data),
- GFP_KERNEL);
- if (!pdata)
- goto of_out;
-
- rc = of_property_read_u32(of_node, "ti,i2c-retry-count", &prop);
- if (!rc)
- pdata->i2c_retry_count = prop;
-
- rc = of_property_read_u32(of_node, "ti,poll-retry-count", &prop);
- if (!rc)
- pdata->poll_retry_count = prop;
-
- if (!of_get_property(of_node, "ti,battery-detect-gpios", NULL)) {
- pdata->battery_detect = -1;
- goto of_out;
- }
-
- pdata->battery_detect = of_get_named_gpio_flags(of_node,
- "ti,battery-detect-gpios", 0, &gpio_flags);
-
- if (gpio_flags & OF_GPIO_ACTIVE_LOW)
- pdata->battery_detect_present = 0;
- else
- pdata->battery_detect_present = 1;
-
-of_out:
- return pdata;
-}
-#else
-#define bq20z75_dt_ids NULL
-static struct bq20z75_platform_data *bq20z75_of_populate_pdata(
- struct i2c_client *client)
-{
- return client->dev.platform_data;
-}
-#endif
-
-static int __devinit bq20z75_probe(struct i2c_client *client,
- const struct i2c_device_id *id)
-{
- struct bq20z75_info *bq20z75_device;
- struct bq20z75_platform_data *pdata = client->dev.platform_data;
- int rc;
- int irq;
-
- bq20z75_device = kzalloc(sizeof(struct bq20z75_info), GFP_KERNEL);
- if (!bq20z75_device)
- return -ENOMEM;
-
- bq20z75_device->client = client;
- bq20z75_device->enable_detection = false;
- bq20z75_device->gpio_detect = false;
- bq20z75_device->power_supply.name = "battery";
- bq20z75_device->power_supply.type = POWER_SUPPLY_TYPE_BATTERY;
- bq20z75_device->power_supply.properties = bq20z75_properties;
- bq20z75_device->power_supply.num_properties =
- ARRAY_SIZE(bq20z75_properties);
- bq20z75_device->power_supply.get_property = bq20z75_get_property;
- /* ignore first notification of external change, it is generated
- * from the power_supply_register call back
- */
- bq20z75_device->ignore_changes = 1;
- bq20z75_device->last_state = POWER_SUPPLY_STATUS_UNKNOWN;
- bq20z75_device->power_supply.external_power_changed =
- bq20z75_external_power_changed;
-
- pdata = bq20z75_of_populate_pdata(client);
-
- if (pdata) {
- bq20z75_device->gpio_detect =
- gpio_is_valid(pdata->battery_detect);
- bq20z75_device->pdata = pdata;
- }
-
- i2c_set_clientdata(client, bq20z75_device);
-
- if (!bq20z75_device->gpio_detect)
- goto skip_gpio;
-
- rc = gpio_request(pdata->battery_detect, dev_name(&client->dev));
- if (rc) {
- dev_warn(&client->dev, "Failed to request gpio: %d\n", rc);
- bq20z75_device->gpio_detect = false;
- goto skip_gpio;
- }
-
- rc = gpio_direction_input(pdata->battery_detect);
- if (rc) {
- dev_warn(&client->dev, "Failed to get gpio as input: %d\n", rc);
- gpio_free(pdata->battery_detect);
- bq20z75_device->gpio_detect = false;
- goto skip_gpio;
- }
-
- irq = gpio_to_irq(pdata->battery_detect);
- if (irq <= 0) {
- dev_warn(&client->dev, "Failed to get gpio as irq: %d\n", irq);
- gpio_free(pdata->battery_detect);
- bq20z75_device->gpio_detect = false;
- goto skip_gpio;
- }
-
- rc = request_irq(irq, bq20z75_irq,
- IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
- dev_name(&client->dev), &bq20z75_device->power_supply);
- if (rc) {
- dev_warn(&client->dev, "Failed to request irq: %d\n", rc);
- gpio_free(pdata->battery_detect);
- bq20z75_device->gpio_detect = false;
- goto skip_gpio;
- }
-
- bq20z75_device->irq = irq;
-
-skip_gpio:
-
- rc = power_supply_register(&client->dev, &bq20z75_device->power_supply);
- if (rc) {
- dev_err(&client->dev,
- "%s: Failed to register power supply\n", __func__);
- goto exit_psupply;
- }
-
- dev_info(&client->dev,
- "%s: battery gas gauge device registered\n", client->name);
-
- INIT_DELAYED_WORK(&bq20z75_device->work, bq20z75_delayed_work);
-
- bq20z75_device->enable_detection = true;
-
- return 0;
-
-exit_psupply:
- if (bq20z75_device->irq)
- free_irq(bq20z75_device->irq, &bq20z75_device->power_supply);
- if (bq20z75_device->gpio_detect)
- gpio_free(pdata->battery_detect);
-
- kfree(bq20z75_device);
-
- return rc;
-}
-
-static int __devexit bq20z75_remove(struct i2c_client *client)
-{
- struct bq20z75_info *bq20z75_device = i2c_get_clientdata(client);
-
- if (bq20z75_device->irq)
- free_irq(bq20z75_device->irq, &bq20z75_device->power_supply);
- if (bq20z75_device->gpio_detect)
- gpio_free(bq20z75_device->pdata->battery_detect);
-
- power_supply_unregister(&bq20z75_device->power_supply);
-
- cancel_delayed_work_sync(&bq20z75_device->work);
-
- kfree(bq20z75_device);
- bq20z75_device = NULL;
-
- return 0;
-}
-
-#if defined CONFIG_PM
-static int bq20z75_suspend(struct i2c_client *client,
- pm_message_t state)
-{
- struct bq20z75_info *bq20z75_device = i2c_get_clientdata(client);
- s32 ret;
-
- if (bq20z75_device->poll_time > 0)
- cancel_delayed_work_sync(&bq20z75_device->work);
-
- /* write to manufacturer access with sleep command */
- ret = bq20z75_write_word_data(client,
- bq20z75_data[REG_MANUFACTURER_DATA].addr,
- MANUFACTURER_ACCESS_SLEEP);
- if (bq20z75_device->is_present && ret < 0)
- return ret;
-
- return 0;
-}
-#else
-#define bq20z75_suspend NULL
-#endif
-/* any smbus transaction will wake up bq20z75 */
-#define bq20z75_resume NULL
-
-static const struct i2c_device_id bq20z75_id[] = {
- { "bq20z75", 0 },
- {}
-};
-MODULE_DEVICE_TABLE(i2c, bq20z75_id);
-
-static struct i2c_driver bq20z75_battery_driver = {
- .probe = bq20z75_probe,
- .remove = __devexit_p(bq20z75_remove),
- .suspend = bq20z75_suspend,
- .resume = bq20z75_resume,
- .id_table = bq20z75_id,
- .driver = {
- .name = "bq20z75-battery",
- .of_match_table = bq20z75_dt_ids,
- },
-};
-
-static int __init bq20z75_battery_init(void)
-{
- return i2c_add_driver(&bq20z75_battery_driver);
-}
-module_init(bq20z75_battery_init);
-
-static void __exit bq20z75_battery_exit(void)
-{
- i2c_del_driver(&bq20z75_battery_driver);
-}
-module_exit(bq20z75_battery_exit);
-
-MODULE_DESCRIPTION("BQ20z75 battery monitor driver");
-MODULE_LICENSE("GPL");
--- /dev/null
+/*
+ * Gas Gauge driver for TI's BQ20Z75
+ *
+ * Copyright (c) 2010, NVIDIA Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/power_supply.h>
+#include <linux/i2c.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/gpio.h>
+
+#include <linux/power/bq20z75.h>
+
+enum {
+ REG_MANUFACTURER_DATA,
+ REG_TEMPERATURE,
+ REG_VOLTAGE,
+ REG_CURRENT,
+ REG_CAPACITY,
+ REG_TIME_TO_EMPTY,
+ REG_TIME_TO_FULL,
+ REG_STATUS,
+ REG_CYCLE_COUNT,
+ REG_SERIAL_NUMBER,
+ REG_REMAINING_CAPACITY,
+ REG_REMAINING_CAPACITY_CHARGE,
+ REG_FULL_CHARGE_CAPACITY,
+ REG_FULL_CHARGE_CAPACITY_CHARGE,
+ REG_DESIGN_CAPACITY,
+ REG_DESIGN_CAPACITY_CHARGE,
+ REG_DESIGN_VOLTAGE,
+};
+
+/* Battery Mode defines */
+#define BATTERY_MODE_OFFSET 0x03
+#define BATTERY_MODE_MASK 0x8000
+enum bq20z75_battery_mode {
+ BATTERY_MODE_AMPS,
+ BATTERY_MODE_WATTS
+};
+
+/* manufacturer access defines */
+#define MANUFACTURER_ACCESS_STATUS 0x0006
+#define MANUFACTURER_ACCESS_SLEEP 0x0011
+
+/* battery status value bits */
+#define BATTERY_DISCHARGING 0x40
+#define BATTERY_FULL_CHARGED 0x20
+#define BATTERY_FULL_DISCHARGED 0x10
+
+#define BQ20Z75_DATA(_psp, _addr, _min_value, _max_value) { \
+ .psp = _psp, \
+ .addr = _addr, \
+ .min_value = _min_value, \
+ .max_value = _max_value, \
+}
+
+static const struct bq20z75_device_data {
+ enum power_supply_property psp;
+ u8 addr;
+ int min_value;
+ int max_value;
+} bq20z75_data[] = {
+ [REG_MANUFACTURER_DATA] =
+ BQ20Z75_DATA(POWER_SUPPLY_PROP_PRESENT, 0x00, 0, 65535),
+ [REG_TEMPERATURE] =
+ BQ20Z75_DATA(POWER_SUPPLY_PROP_TEMP, 0x08, 0, 65535),
+ [REG_VOLTAGE] =
+ BQ20Z75_DATA(POWER_SUPPLY_PROP_VOLTAGE_NOW, 0x09, 0, 20000),
+ [REG_CURRENT] =
+ BQ20Z75_DATA(POWER_SUPPLY_PROP_CURRENT_NOW, 0x0A, -32768,
+ 32767),
+ [REG_CAPACITY] =
+ BQ20Z75_DATA(POWER_SUPPLY_PROP_CAPACITY, 0x0E, 0, 100),
+ [REG_REMAINING_CAPACITY] =
+ BQ20Z75_DATA(POWER_SUPPLY_PROP_ENERGY_NOW, 0x0F, 0, 65535),
+ [REG_REMAINING_CAPACITY_CHARGE] =
+ BQ20Z75_DATA(POWER_SUPPLY_PROP_CHARGE_NOW, 0x0F, 0, 65535),
+ [REG_FULL_CHARGE_CAPACITY] =
+ BQ20Z75_DATA(POWER_SUPPLY_PROP_ENERGY_FULL, 0x10, 0, 65535),
+ [REG_FULL_CHARGE_CAPACITY_CHARGE] =
+ BQ20Z75_DATA(POWER_SUPPLY_PROP_CHARGE_FULL, 0x10, 0, 65535),
+ [REG_TIME_TO_EMPTY] =
+ BQ20Z75_DATA(POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG, 0x12, 0,
+ 65535),
+ [REG_TIME_TO_FULL] =
+ BQ20Z75_DATA(POWER_SUPPLY_PROP_TIME_TO_FULL_AVG, 0x13, 0,
+ 65535),
+ [REG_STATUS] =
+ BQ20Z75_DATA(POWER_SUPPLY_PROP_STATUS, 0x16, 0, 65535),
+ [REG_CYCLE_COUNT] =
+ BQ20Z75_DATA(POWER_SUPPLY_PROP_CYCLE_COUNT, 0x17, 0, 65535),
+ [REG_DESIGN_CAPACITY] =
+ BQ20Z75_DATA(POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN, 0x18, 0,
+ 65535),
+ [REG_DESIGN_CAPACITY_CHARGE] =
+ BQ20Z75_DATA(POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, 0x18, 0,
+ 65535),
+ [REG_DESIGN_VOLTAGE] =
+ BQ20Z75_DATA(POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN, 0x19, 0,
+ 65535),
+ [REG_SERIAL_NUMBER] =
+ BQ20Z75_DATA(POWER_SUPPLY_PROP_SERIAL_NUMBER, 0x1C, 0, 65535),
+};
+
+static enum power_supply_property bq20z75_properties[] = {
+ POWER_SUPPLY_PROP_STATUS,
+ POWER_SUPPLY_PROP_HEALTH,
+ POWER_SUPPLY_PROP_PRESENT,
+ POWER_SUPPLY_PROP_TECHNOLOGY,
+ POWER_SUPPLY_PROP_CYCLE_COUNT,
+ POWER_SUPPLY_PROP_VOLTAGE_NOW,
+ POWER_SUPPLY_PROP_CURRENT_NOW,
+ POWER_SUPPLY_PROP_CAPACITY,
+ POWER_SUPPLY_PROP_TEMP,
+ POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
+ POWER_SUPPLY_PROP_TIME_TO_FULL_AVG,
+ POWER_SUPPLY_PROP_SERIAL_NUMBER,
+ POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
+ POWER_SUPPLY_PROP_ENERGY_NOW,
+ POWER_SUPPLY_PROP_ENERGY_FULL,
+ POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
+ POWER_SUPPLY_PROP_CHARGE_NOW,
+ POWER_SUPPLY_PROP_CHARGE_FULL,
+ POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
+};
+
+struct bq20z75_info {
+ struct i2c_client *client;
+ struct power_supply power_supply;
+ struct bq20z75_platform_data *pdata;
+ bool is_present;
+ bool gpio_detect;
+ bool enable_detection;
+ int irq;
+ int last_state;
+ int poll_time;
+ struct delayed_work work;
+ int ignore_changes;
+};
+
+static int bq20z75_read_word_data(struct i2c_client *client, u8 address)
+{
+ struct bq20z75_info *bq20z75_device = i2c_get_clientdata(client);
+ s32 ret = 0;
+ int retries = 1;
+
+ if (bq20z75_device->pdata)
+ retries = max(bq20z75_device->pdata->i2c_retry_count + 1, 1);
+
+ while (retries > 0) {
+ ret = i2c_smbus_read_word_data(client, address);
+ if (ret >= 0)
+ break;
+ retries--;
+ }
+
+ if (ret < 0) {
+ dev_dbg(&client->dev,
+ "%s: i2c read at address 0x%x failed\n",
+ __func__, address);
+ return ret;
+ }
+
+ return le16_to_cpu(ret);
+}
+
+static int bq20z75_write_word_data(struct i2c_client *client, u8 address,
+ u16 value)
+{
+ struct bq20z75_info *bq20z75_device = i2c_get_clientdata(client);
+ s32 ret = 0;
+ int retries = 1;
+
+ if (bq20z75_device->pdata)
+ retries = max(bq20z75_device->pdata->i2c_retry_count + 1, 1);
+
+ while (retries > 0) {
+ ret = i2c_smbus_write_word_data(client, address,
+ le16_to_cpu(value));
+ if (ret >= 0)
+ break;
+ retries--;
+ }
+
+ if (ret < 0) {
+ dev_dbg(&client->dev,
+ "%s: i2c write to address 0x%x failed\n",
+ __func__, address);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int bq20z75_get_battery_presence_and_health(
+ struct i2c_client *client, enum power_supply_property psp,
+ union power_supply_propval *val)
+{
+ s32 ret;
+ struct bq20z75_info *bq20z75_device = i2c_get_clientdata(client);
+
+ if (psp == POWER_SUPPLY_PROP_PRESENT &&
+ bq20z75_device->gpio_detect) {
+ ret = gpio_get_value(
+ bq20z75_device->pdata->battery_detect);
+ if (ret == bq20z75_device->pdata->battery_detect_present)
+ val->intval = 1;
+ else
+ val->intval = 0;
+ bq20z75_device->is_present = val->intval;
+ return ret;
+ }
+
+ /* Write to ManufacturerAccess with
+ * ManufacturerAccess command and then
+ * read the status */
+ ret = bq20z75_write_word_data(client,
+ bq20z75_data[REG_MANUFACTURER_DATA].addr,
+ MANUFACTURER_ACCESS_STATUS);
+ if (ret < 0) {
+ if (psp == POWER_SUPPLY_PROP_PRESENT)
+ val->intval = 0; /* battery removed */
+ return ret;
+ }
+
+ ret = bq20z75_read_word_data(client,
+ bq20z75_data[REG_MANUFACTURER_DATA].addr);
+ if (ret < 0)
+ return ret;
+
+ if (ret < bq20z75_data[REG_MANUFACTURER_DATA].min_value ||
+ ret > bq20z75_data[REG_MANUFACTURER_DATA].max_value) {
+ val->intval = 0;
+ return 0;
+ }
+
+ /* Mask the upper nibble of 2nd byte and
+ * lower byte of response then
+ * shift the result by 8 to get status*/
+ ret &= 0x0F00;
+ ret >>= 8;
+ if (psp == POWER_SUPPLY_PROP_PRESENT) {
+ if (ret == 0x0F)
+ /* battery removed */
+ val->intval = 0;
+ else
+ val->intval = 1;
+ } else if (psp == POWER_SUPPLY_PROP_HEALTH) {
+ if (ret == 0x09)
+ val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
+ else if (ret == 0x0B)
+ val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
+ else if (ret == 0x0C)
+ val->intval = POWER_SUPPLY_HEALTH_DEAD;
+ else
+ val->intval = POWER_SUPPLY_HEALTH_GOOD;
+ }
+
+ return 0;
+}
+
+static int bq20z75_get_battery_property(struct i2c_client *client,
+ int reg_offset, enum power_supply_property psp,
+ union power_supply_propval *val)
+{
+ struct bq20z75_info *bq20z75_device = i2c_get_clientdata(client);
+ s32 ret;
+
+ ret = bq20z75_read_word_data(client,
+ bq20z75_data[reg_offset].addr);
+ if (ret < 0)
+ return ret;
+
+ /* returned values are 16 bit */
+ if (bq20z75_data[reg_offset].min_value < 0)
+ ret = (s16)ret;
+
+ if (ret >= bq20z75_data[reg_offset].min_value &&
+ ret <= bq20z75_data[reg_offset].max_value) {
+ val->intval = ret;
+ if (psp != POWER_SUPPLY_PROP_STATUS)
+ return 0;
+
+ if (ret & BATTERY_FULL_CHARGED)
+ val->intval = POWER_SUPPLY_STATUS_FULL;
+ else if (ret & BATTERY_FULL_DISCHARGED)
+ val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
+ else if (ret & BATTERY_DISCHARGING)
+ val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
+ else
+ val->intval = POWER_SUPPLY_STATUS_CHARGING;
+
+ if (bq20z75_device->poll_time == 0)
+ bq20z75_device->last_state = val->intval;
+ else if (bq20z75_device->last_state != val->intval) {
+ cancel_delayed_work_sync(&bq20z75_device->work);
+ power_supply_changed(&bq20z75_device->power_supply);
+ bq20z75_device->poll_time = 0;
+ }
+ } else {
+ if (psp == POWER_SUPPLY_PROP_STATUS)
+ val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
+ else
+ val->intval = 0;
+ }
+
+ return 0;
+}
+
+static void bq20z75_unit_adjustment(struct i2c_client *client,
+ enum power_supply_property psp, union power_supply_propval *val)
+{
+#define BASE_UNIT_CONVERSION 1000
+#define BATTERY_MODE_CAP_MULT_WATT (10 * BASE_UNIT_CONVERSION)
+#define TIME_UNIT_CONVERSION 60
+#define TEMP_KELVIN_TO_CELSIUS 2731
+ switch (psp) {
+ case POWER_SUPPLY_PROP_ENERGY_NOW:
+ case POWER_SUPPLY_PROP_ENERGY_FULL:
+ case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
+ /* bq20z75 provides energy in units of 10mWh.
+ * Convert to µWh
+ */
+ val->intval *= BATTERY_MODE_CAP_MULT_WATT;
+ break;
+
+ case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+ case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
+ case POWER_SUPPLY_PROP_CURRENT_NOW:
+ case POWER_SUPPLY_PROP_CHARGE_NOW:
+ case POWER_SUPPLY_PROP_CHARGE_FULL:
+ case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
+ val->intval *= BASE_UNIT_CONVERSION;
+ break;
+
+ case POWER_SUPPLY_PROP_TEMP:
+ /* bq20z75 provides battery temperature in 0.1K
+ * so convert it to 0.1°C
+ */
+ val->intval -= TEMP_KELVIN_TO_CELSIUS;
+ break;
+
+ case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
+ case POWER_SUPPLY_PROP_TIME_TO_FULL_AVG:
+ /* bq20z75 provides time to empty and time to full in minutes.
+ * Convert to seconds
+ */
+ val->intval *= TIME_UNIT_CONVERSION;
+ break;
+
+ default:
+ dev_dbg(&client->dev,
+ "%s: no need for unit conversion %d\n", __func__, psp);
+ }
+}
+
+static enum bq20z75_battery_mode
+bq20z75_set_battery_mode(struct i2c_client *client,
+ enum bq20z75_battery_mode mode)
+{
+ int ret, original_val;
+
+ original_val = bq20z75_read_word_data(client, BATTERY_MODE_OFFSET);
+ if (original_val < 0)
+ return original_val;
+
+ if ((original_val & BATTERY_MODE_MASK) == mode)
+ return mode;
+
+ if (mode == BATTERY_MODE_AMPS)
+ ret = original_val & ~BATTERY_MODE_MASK;
+ else
+ ret = original_val | BATTERY_MODE_MASK;
+
+ ret = bq20z75_write_word_data(client, BATTERY_MODE_OFFSET, ret);
+ if (ret < 0)
+ return ret;
+
+ return original_val & BATTERY_MODE_MASK;
+}
+
+static int bq20z75_get_battery_capacity(struct i2c_client *client,
+ int reg_offset, enum power_supply_property psp,
+ union power_supply_propval *val)
+{
+ s32 ret;
+ enum bq20z75_battery_mode mode = BATTERY_MODE_WATTS;
+
+ if (power_supply_is_amp_property(psp))
+ mode = BATTERY_MODE_AMPS;
+
+ mode = bq20z75_set_battery_mode(client, mode);
+ if (mode < 0)
+ return mode;
+
+ ret = bq20z75_read_word_data(client, bq20z75_data[reg_offset].addr);
+ if (ret < 0)
+ return ret;
+
+ if (psp == POWER_SUPPLY_PROP_CAPACITY) {
+ /* bq20z75 spec says that this can be >100 %
+ * even if max value is 100 % */
+ val->intval = min(ret, 100);
+ } else
+ val->intval = ret;
+
+ ret = bq20z75_set_battery_mode(client, mode);
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+
+static char bq20z75_serial[5];
+static int bq20z75_get_battery_serial_number(struct i2c_client *client,
+ union power_supply_propval *val)
+{
+ int ret;
+
+ ret = bq20z75_read_word_data(client,
+ bq20z75_data[REG_SERIAL_NUMBER].addr);
+ if (ret < 0)
+ return ret;
+
+ ret = sprintf(bq20z75_serial, "%04x", ret);
+ val->strval = bq20z75_serial;
+
+ return 0;
+}
+
+static int bq20z75_get_property_index(struct i2c_client *client,
+ enum power_supply_property psp)
+{
+ int count;
+ for (count = 0; count < ARRAY_SIZE(bq20z75_data); count++)
+ if (psp == bq20z75_data[count].psp)
+ return count;
+
+ dev_warn(&client->dev,
+ "%s: Invalid Property - %d\n", __func__, psp);
+
+ return -EINVAL;
+}
+
+static int bq20z75_get_property(struct power_supply *psy,
+ enum power_supply_property psp,
+ union power_supply_propval *val)
+{
+ int ret = 0;
+ struct bq20z75_info *bq20z75_device = container_of(psy,
+ struct bq20z75_info, power_supply);
+ struct i2c_client *client = bq20z75_device->client;
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_PRESENT:
+ case POWER_SUPPLY_PROP_HEALTH:
+ ret = bq20z75_get_battery_presence_and_health(client, psp, val);
+ if (psp == POWER_SUPPLY_PROP_PRESENT)
+ return 0;
+ break;
+
+ case POWER_SUPPLY_PROP_TECHNOLOGY:
+ val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
+ break;
+
+ case POWER_SUPPLY_PROP_ENERGY_NOW:
+ case POWER_SUPPLY_PROP_ENERGY_FULL:
+ case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
+ case POWER_SUPPLY_PROP_CHARGE_NOW:
+ case POWER_SUPPLY_PROP_CHARGE_FULL:
+ case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
+ case POWER_SUPPLY_PROP_CAPACITY:
+ ret = bq20z75_get_property_index(client, psp);
+ if (ret < 0)
+ break;
+
+ ret = bq20z75_get_battery_capacity(client, ret, psp, val);
+ break;
+
+ case POWER_SUPPLY_PROP_SERIAL_NUMBER:
+ ret = bq20z75_get_battery_serial_number(client, val);
+ break;
+
+ case POWER_SUPPLY_PROP_STATUS:
+ case POWER_SUPPLY_PROP_CYCLE_COUNT:
+ case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+ case POWER_SUPPLY_PROP_CURRENT_NOW:
+ case POWER_SUPPLY_PROP_TEMP:
+ case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
+ case POWER_SUPPLY_PROP_TIME_TO_FULL_AVG:
+ case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
+ ret = bq20z75_get_property_index(client, psp);
+ if (ret < 0)
+ break;
+
+ ret = bq20z75_get_battery_property(client, ret, psp, val);
+ break;
+
+ default:
+ dev_err(&client->dev,
+ "%s: INVALID property\n", __func__);
+ return -EINVAL;
+ }
+
+ if (!bq20z75_device->enable_detection)
+ goto done;
+
+ if (!bq20z75_device->gpio_detect &&
+ bq20z75_device->is_present != (ret >= 0)) {
+ bq20z75_device->is_present = (ret >= 0);
+ power_supply_changed(&bq20z75_device->power_supply);
+ }
+
+done:
+ if (!ret) {
+ /* Convert units to match requirements for power supply class */
+ bq20z75_unit_adjustment(client, psp, val);
+ }
+
+ dev_dbg(&client->dev,
+ "%s: property = %d, value = %x\n", __func__, psp, val->intval);
+
+ if (ret && bq20z75_device->is_present)
+ return ret;
+
+ /* battery not present, so return NODATA for properties */
+ if (ret)
+ return -ENODATA;
+
+ return 0;
+}
+
+static irqreturn_t bq20z75_irq(int irq, void *devid)
+{
+ struct power_supply *battery = devid;
+
+ power_supply_changed(battery);
+
+ return IRQ_HANDLED;
+}
+
+static void bq20z75_external_power_changed(struct power_supply *psy)
+{
+ struct bq20z75_info *bq20z75_device;
+
+ bq20z75_device = container_of(psy, struct bq20z75_info, power_supply);
+
+ if (bq20z75_device->ignore_changes > 0) {
+ bq20z75_device->ignore_changes--;
+ return;
+ }
+
+ /* cancel outstanding work */
+ cancel_delayed_work_sync(&bq20z75_device->work);
+
+ schedule_delayed_work(&bq20z75_device->work, HZ);
+ bq20z75_device->poll_time = bq20z75_device->pdata->poll_retry_count;
+}
+
+static void bq20z75_delayed_work(struct work_struct *work)
+{
+ struct bq20z75_info *bq20z75_device;
+ s32 ret;
+
+ bq20z75_device = container_of(work, struct bq20z75_info, work.work);
+
+ ret = bq20z75_read_word_data(bq20z75_device->client,
+ bq20z75_data[REG_STATUS].addr);
+ /* if the read failed, give up on this work */
+ if (ret < 0) {
+ bq20z75_device->poll_time = 0;
+ return;
+ }
+
+ if (ret & BATTERY_FULL_CHARGED)
+ ret = POWER_SUPPLY_STATUS_FULL;
+ else if (ret & BATTERY_FULL_DISCHARGED)
+ ret = POWER_SUPPLY_STATUS_NOT_CHARGING;
+ else if (ret & BATTERY_DISCHARGING)
+ ret = POWER_SUPPLY_STATUS_DISCHARGING;
+ else
+ ret = POWER_SUPPLY_STATUS_CHARGING;
+
+ if (bq20z75_device->last_state != ret) {
+ bq20z75_device->poll_time = 0;
+ power_supply_changed(&bq20z75_device->power_supply);
+ return;
+ }
+ if (bq20z75_device->poll_time > 0) {
+ schedule_delayed_work(&bq20z75_device->work, HZ);
+ bq20z75_device->poll_time--;
+ return;
+ }
+}
+
+#if defined(CONFIG_OF)
+
+#include <linux/of_device.h>
+#include <linux/of_gpio.h>
+
+static const struct of_device_id bq20z75_dt_ids[] = {
+ { .compatible = "ti,bq20z75" },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, bq20z75_dt_ids);
+
+static struct bq20z75_platform_data *bq20z75_of_populate_pdata(
+ struct i2c_client *client)
+{
+ struct device_node *of_node = client->dev.of_node;
+ struct bq20z75_platform_data *pdata = client->dev.platform_data;
+ enum of_gpio_flags gpio_flags;
+ int rc;
+ u32 prop;
+
+ /* verify this driver matches this device */
+ if (!of_node)
+ return NULL;
+
+ /* if platform data is set, honor it */
+ if (pdata)
+ return pdata;
+
+ /* first make sure at least one property is set, otherwise
+ * it won't change behavior from running without pdata.
+ */
+ if (!of_get_property(of_node, "ti,i2c-retry-count", NULL) &&
+ !of_get_property(of_node, "ti,poll-retry-count", NULL) &&
+ !of_get_property(of_node, "ti,battery-detect-gpios", NULL))
+ goto of_out;
+
+ pdata = devm_kzalloc(&client->dev, sizeof(struct bq20z75_platform_data),
+ GFP_KERNEL);
+ if (!pdata)
+ goto of_out;
+
+ rc = of_property_read_u32(of_node, "ti,i2c-retry-count", &prop);
+ if (!rc)
+ pdata->i2c_retry_count = prop;
+
+ rc = of_property_read_u32(of_node, "ti,poll-retry-count", &prop);
+ if (!rc)
+ pdata->poll_retry_count = prop;
+
+ if (!of_get_property(of_node, "ti,battery-detect-gpios", NULL)) {
+ pdata->battery_detect = -1;
+ goto of_out;
+ }
+
+ pdata->battery_detect = of_get_named_gpio_flags(of_node,
+ "ti,battery-detect-gpios", 0, &gpio_flags);
+
+ if (gpio_flags & OF_GPIO_ACTIVE_LOW)
+ pdata->battery_detect_present = 0;
+ else
+ pdata->battery_detect_present = 1;
+
+of_out:
+ return pdata;
+}
+#else
+#define bq20z75_dt_ids NULL
+static struct bq20z75_platform_data *bq20z75_of_populate_pdata(
+ struct i2c_client *client)
+{
+ return client->dev.platform_data;
+}
+#endif
+
+static int __devinit bq20z75_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct bq20z75_info *bq20z75_device;
+ struct bq20z75_platform_data *pdata = client->dev.platform_data;
+ int rc;
+ int irq;
+
+ bq20z75_device = kzalloc(sizeof(struct bq20z75_info), GFP_KERNEL);
+ if (!bq20z75_device)
+ return -ENOMEM;
+
+ bq20z75_device->client = client;
+ bq20z75_device->enable_detection = false;
+ bq20z75_device->gpio_detect = false;
+ bq20z75_device->power_supply.name = "battery";
+ bq20z75_device->power_supply.type = POWER_SUPPLY_TYPE_BATTERY;
+ bq20z75_device->power_supply.properties = bq20z75_properties;
+ bq20z75_device->power_supply.num_properties =
+ ARRAY_SIZE(bq20z75_properties);
+ bq20z75_device->power_supply.get_property = bq20z75_get_property;
+ /* ignore first notification of external change, it is generated
+ * from the power_supply_register call back
+ */
+ bq20z75_device->ignore_changes = 1;
+ bq20z75_device->last_state = POWER_SUPPLY_STATUS_UNKNOWN;
+ bq20z75_device->power_supply.external_power_changed =
+ bq20z75_external_power_changed;
+
+ pdata = bq20z75_of_populate_pdata(client);
+
+ if (pdata) {
+ bq20z75_device->gpio_detect =
+ gpio_is_valid(pdata->battery_detect);
+ bq20z75_device->pdata = pdata;
+ }
+
+ i2c_set_clientdata(client, bq20z75_device);
+
+ if (!bq20z75_device->gpio_detect)
+ goto skip_gpio;
+
+ rc = gpio_request(pdata->battery_detect, dev_name(&client->dev));
+ if (rc) {
+ dev_warn(&client->dev, "Failed to request gpio: %d\n", rc);
+ bq20z75_device->gpio_detect = false;
+ goto skip_gpio;
+ }
+
+ rc = gpio_direction_input(pdata->battery_detect);
+ if (rc) {
+ dev_warn(&client->dev, "Failed to get gpio as input: %d\n", rc);
+ gpio_free(pdata->battery_detect);
+ bq20z75_device->gpio_detect = false;
+ goto skip_gpio;
+ }
+
+ irq = gpio_to_irq(pdata->battery_detect);
+ if (irq <= 0) {
+ dev_warn(&client->dev, "Failed to get gpio as irq: %d\n", irq);
+ gpio_free(pdata->battery_detect);
+ bq20z75_device->gpio_detect = false;
+ goto skip_gpio;
+ }
+
+ rc = request_irq(irq, bq20z75_irq,
+ IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
+ dev_name(&client->dev), &bq20z75_device->power_supply);
+ if (rc) {
+ dev_warn(&client->dev, "Failed to request irq: %d\n", rc);
+ gpio_free(pdata->battery_detect);
+ bq20z75_device->gpio_detect = false;
+ goto skip_gpio;
+ }
+
+ bq20z75_device->irq = irq;
+
+skip_gpio:
+
+ rc = power_supply_register(&client->dev, &bq20z75_device->power_supply);
+ if (rc) {
+ dev_err(&client->dev,
+ "%s: Failed to register power supply\n", __func__);
+ goto exit_psupply;
+ }
+
+ dev_info(&client->dev,
+ "%s: battery gas gauge device registered\n", client->name);
+
+ INIT_DELAYED_WORK(&bq20z75_device->work, bq20z75_delayed_work);
+
+ bq20z75_device->enable_detection = true;
+
+ return 0;
+
+exit_psupply:
+ if (bq20z75_device->irq)
+ free_irq(bq20z75_device->irq, &bq20z75_device->power_supply);
+ if (bq20z75_device->gpio_detect)
+ gpio_free(pdata->battery_detect);
+
+ kfree(bq20z75_device);
+
+ return rc;
+}
+
+static int __devexit bq20z75_remove(struct i2c_client *client)
+{
+ struct bq20z75_info *bq20z75_device = i2c_get_clientdata(client);
+
+ if (bq20z75_device->irq)
+ free_irq(bq20z75_device->irq, &bq20z75_device->power_supply);
+ if (bq20z75_device->gpio_detect)
+ gpio_free(bq20z75_device->pdata->battery_detect);
+
+ power_supply_unregister(&bq20z75_device->power_supply);
+
+ cancel_delayed_work_sync(&bq20z75_device->work);
+
+ kfree(bq20z75_device);
+ bq20z75_device = NULL;
+
+ return 0;
+}
+
+#if defined CONFIG_PM
+static int bq20z75_suspend(struct i2c_client *client,
+ pm_message_t state)
+{
+ struct bq20z75_info *bq20z75_device = i2c_get_clientdata(client);
+ s32 ret;
+
+ if (bq20z75_device->poll_time > 0)
+ cancel_delayed_work_sync(&bq20z75_device->work);
+
+ /* write to manufacturer access with sleep command */
+ ret = bq20z75_write_word_data(client,
+ bq20z75_data[REG_MANUFACTURER_DATA].addr,
+ MANUFACTURER_ACCESS_SLEEP);
+ if (bq20z75_device->is_present && ret < 0)
+ return ret;
+
+ return 0;
+}
+#else
+#define bq20z75_suspend NULL
+#endif
+/* any smbus transaction will wake up bq20z75 */
+#define bq20z75_resume NULL
+
+static const struct i2c_device_id bq20z75_id[] = {
+ { "bq20z75", 0 },
+ {}
+};
+MODULE_DEVICE_TABLE(i2c, bq20z75_id);
+
+static struct i2c_driver bq20z75_battery_driver = {
+ .probe = bq20z75_probe,
+ .remove = __devexit_p(bq20z75_remove),
+ .suspend = bq20z75_suspend,
+ .resume = bq20z75_resume,
+ .id_table = bq20z75_id,
+ .driver = {
+ .name = "bq20z75-battery",
+ .of_match_table = bq20z75_dt_ids,
+ },
+};
+
+static int __init bq20z75_battery_init(void)
+{
+ return i2c_add_driver(&bq20z75_battery_driver);
+}
+module_init(bq20z75_battery_init);
+
+static void __exit bq20z75_battery_exit(void)
+{
+ i2c_del_driver(&bq20z75_battery_driver);
+}
+module_exit(bq20z75_battery_exit);
+
+MODULE_DESCRIPTION("BQ20z75 battery monitor driver");
+MODULE_LICENSE("GPL");
+++ /dev/null
-/*
- * Gas Gauge driver for TI's BQ20Z75
- *
- * Copyright (c) 2010, NVIDIA Corporation.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
- */
-
-#ifndef __LINUX_POWER_BQ20Z75_H_
-#define __LINUX_POWER_BQ20Z75_H_
-
-#include <linux/power_supply.h>
-#include <linux/types.h>
-
-/**
- * struct bq20z75_platform_data - platform data for bq20z75 devices
- * @battery_detect: GPIO which is used to detect battery presence
- * @battery_detect_present: gpio state when battery is present (0 / 1)
- * @i2c_retry_count: # of times to retry on i2c IO failure
- * @poll_retry_count: # of times to retry looking for new status after
- * external change notification
- */
-struct bq20z75_platform_data {
- int battery_detect;
- int battery_detect_present;
- int i2c_retry_count;
- int poll_retry_count;
-};
-
-#endif
--- /dev/null
+/*
+ * Gas Gauge driver for TI's BQ20Z75
+ *
+ * Copyright (c) 2010, NVIDIA Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#ifndef __LINUX_POWER_BQ20Z75_H_
+#define __LINUX_POWER_BQ20Z75_H_
+
+#include <linux/power_supply.h>
+#include <linux/types.h>
+
+/**
+ * struct bq20z75_platform_data - platform data for bq20z75 devices
+ * @battery_detect: GPIO which is used to detect battery presence
+ * @battery_detect_present: gpio state when battery is present (0 / 1)
+ * @i2c_retry_count: # of times to retry on i2c IO failure
+ * @poll_retry_count: # of times to retry looking for new status after
+ * external change notification
+ */
+struct bq20z75_platform_data {
+ int battery_detect;
+ int battery_detect_present;
+ int i2c_retry_count;
+ int poll_retry_count;
+};
+
+#endif