diff options
Diffstat (limited to 'drivers/power/supply/sbs-battery.c')
| -rw-r--r-- | drivers/power/supply/sbs-battery.c | 934 |
1 files changed, 934 insertions, 0 deletions
diff --git a/drivers/power/supply/sbs-battery.c b/drivers/power/supply/sbs-battery.c new file mode 100644 index 0000000..8bb2eb3 --- /dev/null +++ b/drivers/power/supply/sbs-battery.c @@ -0,0 +1,934 @@ +/* + * Gas Gauge driver for SBS Compliant Batteries + * + * 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/consumer.h> +#include <linux/of.h> +#include <linux/stat.h> + +#include <linux/power/sbs-battery.h> + +enum { + REG_MANUFACTURER_DATA, + REG_TEMPERATURE, + REG_VOLTAGE, + REG_CURRENT, + REG_CAPACITY, + REG_TIME_TO_EMPTY, + REG_TIME_TO_FULL, + REG_STATUS, + REG_CAPACITY_LEVEL, + 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_MIN, + REG_DESIGN_VOLTAGE_MAX, + REG_MANUFACTURER, + REG_MODEL_NAME, +}; + +/* Battery Mode defines */ +#define BATTERY_MODE_OFFSET 0x03 +#define BATTERY_MODE_MASK 0x8000 +enum sbs_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_INITIALIZED 0x80 +#define BATTERY_DISCHARGING 0x40 +#define BATTERY_FULL_CHARGED 0x20 +#define BATTERY_FULL_DISCHARGED 0x10 + +/* min_value and max_value are only valid for numerical data */ +#define SBS_DATA(_psp, _addr, _min_value, _max_value) { \ + .psp = _psp, \ + .addr = _addr, \ + .min_value = _min_value, \ + .max_value = _max_value, \ +} + +static const struct chip_data { + enum power_supply_property psp; + u8 addr; + int min_value; + int max_value; +} sbs_data[] = { + [REG_MANUFACTURER_DATA] = + SBS_DATA(POWER_SUPPLY_PROP_PRESENT, 0x00, 0, 65535), + [REG_TEMPERATURE] = + SBS_DATA(POWER_SUPPLY_PROP_TEMP, 0x08, 0, 65535), + [REG_VOLTAGE] = + SBS_DATA(POWER_SUPPLY_PROP_VOLTAGE_NOW, 0x09, 0, 20000), + [REG_CURRENT] = + SBS_DATA(POWER_SUPPLY_PROP_CURRENT_NOW, 0x0A, -32768, 32767), + [REG_CAPACITY] = + SBS_DATA(POWER_SUPPLY_PROP_CAPACITY, 0x0D, 0, 100), + [REG_REMAINING_CAPACITY] = + SBS_DATA(POWER_SUPPLY_PROP_ENERGY_NOW, 0x0F, 0, 65535), + [REG_REMAINING_CAPACITY_CHARGE] = + SBS_DATA(POWER_SUPPLY_PROP_CHARGE_NOW, 0x0F, 0, 65535), + [REG_FULL_CHARGE_CAPACITY] = + SBS_DATA(POWER_SUPPLY_PROP_ENERGY_FULL, 0x10, 0, 65535), + [REG_FULL_CHARGE_CAPACITY_CHARGE] = + SBS_DATA(POWER_SUPPLY_PROP_CHARGE_FULL, 0x10, 0, 65535), + [REG_TIME_TO_EMPTY] = + SBS_DATA(POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG, 0x12, 0, 65535), + [REG_TIME_TO_FULL] = + SBS_DATA(POWER_SUPPLY_PROP_TIME_TO_FULL_AVG, 0x13, 0, 65535), + [REG_STATUS] = + SBS_DATA(POWER_SUPPLY_PROP_STATUS, 0x16, 0, 65535), + [REG_CAPACITY_LEVEL] = + SBS_DATA(POWER_SUPPLY_PROP_CAPACITY_LEVEL, 0x16, 0, 65535), + [REG_CYCLE_COUNT] = + SBS_DATA(POWER_SUPPLY_PROP_CYCLE_COUNT, 0x17, 0, 65535), + [REG_DESIGN_CAPACITY] = + SBS_DATA(POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN, 0x18, 0, 65535), + [REG_DESIGN_CAPACITY_CHARGE] = + SBS_DATA(POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, 0x18, 0, 65535), + [REG_DESIGN_VOLTAGE_MIN] = + SBS_DATA(POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, 0x19, 0, 65535), + [REG_DESIGN_VOLTAGE_MAX] = + SBS_DATA(POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN, 0x19, 0, 65535), + [REG_SERIAL_NUMBER] = + SBS_DATA(POWER_SUPPLY_PROP_SERIAL_NUMBER, 0x1C, 0, 65535), + /* Properties of type `const char *' */ + [REG_MANUFACTURER] = + SBS_DATA(POWER_SUPPLY_PROP_MANUFACTURER, 0x20, 0, 65535), + [REG_MODEL_NAME] = + SBS_DATA(POWER_SUPPLY_PROP_MODEL_NAME, 0x21, 0, 65535) +}; + +static enum power_supply_property sbs_properties[] = { + POWER_SUPPLY_PROP_STATUS, + POWER_SUPPLY_PROP_CAPACITY_LEVEL, + 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_MIN_DESIGN, + 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, + /* Properties of type `const char *' */ + POWER_SUPPLY_PROP_MANUFACTURER, + POWER_SUPPLY_PROP_MODEL_NAME +}; + +struct sbs_info { + struct i2c_client *client; + struct power_supply *power_supply; + bool is_present; + struct gpio_desc *gpio_detect; + bool enable_detection; + int last_state; + int poll_time; + u32 i2c_retry_count; + u32 poll_retry_count; + struct delayed_work work; + int ignore_changes; +}; + +static char model_name[I2C_SMBUS_BLOCK_MAX + 1]; +static char manufacturer[I2C_SMBUS_BLOCK_MAX + 1]; +static bool force_load; + +static int sbs_read_word_data(struct i2c_client *client, u8 address) +{ + struct sbs_info *chip = i2c_get_clientdata(client); + s32 ret = 0; + int retries = 1; + + retries = chip->i2c_retry_count; + + 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 sbs_read_string_data(struct i2c_client *client, u8 address, + char *values) +{ + struct sbs_info *chip = i2c_get_clientdata(client); + s32 ret = 0, block_length = 0; + int retries_length = 1, retries_block = 1; + u8 block_buffer[I2C_SMBUS_BLOCK_MAX + 1]; + + retries_length = chip->i2c_retry_count; + retries_block = chip->i2c_retry_count; + + /* Adapter needs to support these two functions */ + if (!i2c_check_functionality(client->adapter, + I2C_FUNC_SMBUS_BYTE_DATA | + I2C_FUNC_SMBUS_I2C_BLOCK)){ + return -ENODEV; + } + + /* Get the length of block data */ + while (retries_length > 0) { + ret = i2c_smbus_read_byte_data(client, address); + if (ret >= 0) + break; + retries_length--; + } + + if (ret < 0) { + dev_dbg(&client->dev, + "%s: i2c read at address 0x%x failed\n", + __func__, address); + return ret; + } + + /* block_length does not include NULL terminator */ + block_length = ret; + if (block_length > I2C_SMBUS_BLOCK_MAX) { + dev_err(&client->dev, + "%s: Returned block_length is longer than 0x%x\n", + __func__, I2C_SMBUS_BLOCK_MAX); + return -EINVAL; + } + + /* Get the block data */ + while (retries_block > 0) { + ret = i2c_smbus_read_i2c_block_data( + client, address, + block_length + 1, block_buffer); + if (ret >= 0) + break; + retries_block--; + } + + if (ret < 0) { + dev_dbg(&client->dev, + "%s: i2c read at address 0x%x failed\n", + __func__, address); + return ret; + } + + /* block_buffer[0] == block_length */ + memcpy(values, block_buffer + 1, block_length); + values[block_length] = '\0'; + + return le16_to_cpu(ret); +} + +static int sbs_write_word_data(struct i2c_client *client, u8 address, + u16 value) +{ + struct sbs_info *chip = i2c_get_clientdata(client); + s32 ret = 0; + int retries = 1; + + retries = chip->i2c_retry_count; + + 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 sbs_get_battery_presence_and_health( + struct i2c_client *client, enum power_supply_property psp, + union power_supply_propval *val) +{ + s32 ret; + struct sbs_info *chip = i2c_get_clientdata(client); + + if (psp == POWER_SUPPLY_PROP_PRESENT && chip->gpio_detect) { + ret = gpiod_get_value_cansleep(chip->gpio_detect); + if (ret < 0) + return ret; + val->intval = ret; + chip->is_present = val->intval; + return ret; + } + + /* + * Write to ManufacturerAccess with ManufacturerAccess command + * and then read the status. Do not check for error on the write + * since not all batteries implement write access to this command, + * while others mandate it. + */ + sbs_write_word_data(client, sbs_data[REG_MANUFACTURER_DATA].addr, + MANUFACTURER_ACCESS_STATUS); + + ret = sbs_read_word_data(client, sbs_data[REG_MANUFACTURER_DATA].addr); + if (ret < 0) { + if (psp == POWER_SUPPLY_PROP_PRESENT) + val->intval = 0; /* battery removed */ + return ret; + } + + if (ret < sbs_data[REG_MANUFACTURER_DATA].min_value || + ret > sbs_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 sbs_get_battery_property(struct i2c_client *client, + int reg_offset, enum power_supply_property psp, + union power_supply_propval *val) +{ + struct sbs_info *chip = i2c_get_clientdata(client); + s32 ret; + + ret = sbs_read_word_data(client, sbs_data[reg_offset].addr); + if (ret < 0) + return ret; + + /* returned values are 16 bit */ + if (sbs_data[reg_offset].min_value < 0) + ret = (s16)ret; + + if (ret >= sbs_data[reg_offset].min_value && + ret <= sbs_data[reg_offset].max_value) { + val->intval = ret; + if (psp == POWER_SUPPLY_PROP_CAPACITY_LEVEL) { + if (!(ret & BATTERY_INITIALIZED)) + val->intval = + POWER_SUPPLY_CAPACITY_LEVEL_UNKNOWN; + else if (ret & BATTERY_FULL_CHARGED) + val->intval = + POWER_SUPPLY_CAPACITY_LEVEL_FULL; + else if (ret & BATTERY_FULL_DISCHARGED) + val->intval = + POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL; + else + val->intval = + POWER_SUPPLY_CAPACITY_LEVEL_NORMAL; + return 0; + } else if (psp != POWER_SUPPLY_PROP_STATUS) { + return 0; + } + + if (ret & BATTERY_FULL_CHARGED) + val->intval = POWER_SUPPLY_STATUS_FULL; + else if (ret & BATTERY_DISCHARGING) + val->intval = POWER_SUPPLY_STATUS_DISCHARGING; + else + val->intval = POWER_SUPPLY_STATUS_CHARGING; + + if (chip->poll_time == 0) + chip->last_state = val->intval; + else if (chip->last_state != val->intval) { + cancel_delayed_work_sync(&chip->work); + power_supply_changed(chip->power_supply); + chip->poll_time = 0; + } + } else { + if (psp == POWER_SUPPLY_PROP_STATUS) + val->intval = POWER_SUPPLY_STATUS_UNKNOWN; + else + val->intval = 0; + } + + return 0; +} + +static int sbs_get_battery_string_property(struct i2c_client *client, + int reg_offset, enum power_supply_property psp, char *val) +{ + s32 ret; + + ret = sbs_read_string_data(client, sbs_data[reg_offset].addr, val); + + if (ret < 0) + return ret; + + return 0; +} + +static void sbs_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: + /* sbs 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_MIN_DESIGN: + 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: + /* sbs 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: + /* sbs 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 sbs_battery_mode sbs_set_battery_mode(struct i2c_client *client, + enum sbs_battery_mode mode) +{ + int ret, original_val; + + original_val = sbs_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 = sbs_write_word_data(client, BATTERY_MODE_OFFSET, ret); + if (ret < 0) + return ret; + + return original_val & BATTERY_MODE_MASK; +} + +static int sbs_get_battery_capacity(struct i2c_client *client, + int reg_offset, enum power_supply_property psp, + union power_supply_propval *val) +{ + s32 ret; + enum sbs_battery_mode mode = BATTERY_MODE_WATTS; + + if (power_supply_is_amp_property(psp)) + mode = BATTERY_MODE_AMPS; + + mode = sbs_set_battery_mode(client, mode); + if (mode < 0) + return mode; + + ret = sbs_read_word_data(client, sbs_data[reg_offset].addr); + if (ret < 0) + return ret; + + if (psp == POWER_SUPPLY_PROP_CAPACITY) { + /* sbs spec says that this can be >100 % + * even if max value is 100 % */ + val->intval = min(ret, 100); + } else + val->intval = ret; + + ret = sbs_set_battery_mode(client, mode); + if (ret < 0) + return ret; + + return 0; +} + +static char sbs_serial[5]; +static int sbs_get_battery_serial_number(struct i2c_client *client, + union power_supply_propval *val) +{ + int ret; + + ret = sbs_read_word_data(client, sbs_data[REG_SERIAL_NUMBER].addr); + if (ret < 0) + return ret; + + ret = sprintf(sbs_serial, "%04x", ret); + val->strval = sbs_serial; + + return 0; +} + +static int sbs_get_property_index(struct i2c_client *client, + enum power_supply_property psp) +{ + int count; + for (count = 0; count < ARRAY_SIZE(sbs_data); count++) + if (psp == sbs_data[count].psp) + return count; + + dev_warn(&client->dev, + "%s: Invalid Property - %d\n", __func__, psp); + + return -EINVAL; +} + +static int sbs_get_property(struct power_supply *psy, + enum power_supply_property psp, + union power_supply_propval *val) +{ + int ret = 0; + struct sbs_info *chip = power_supply_get_drvdata(psy); + struct i2c_client *client = chip->client; + + switch (psp) { + case POWER_SUPPLY_PROP_PRESENT: + case POWER_SUPPLY_PROP_HEALTH: + ret = sbs_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; + goto done; /* don't trigger power_supply_changed()! */ + + 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 = sbs_get_property_index(client, psp); + if (ret < 0) + break; + + ret = sbs_get_battery_capacity(client, ret, psp, val); + break; + + case POWER_SUPPLY_PROP_SERIAL_NUMBER: + ret = sbs_get_battery_serial_number(client, val); + break; + + case POWER_SUPPLY_PROP_STATUS: + case POWER_SUPPLY_PROP_CAPACITY_LEVEL: + 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_MIN_DESIGN: + case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN: + ret = sbs_get_property_index(client, psp); + if (ret < 0) + break; + + ret = sbs_get_battery_property(client, ret, psp, val); + break; + + case POWER_SUPPLY_PROP_MODEL_NAME: + ret = sbs_get_property_index(client, psp); + if (ret < 0) + break; + + ret = sbs_get_battery_string_property(client, ret, psp, + model_name); + val->strval = model_name; + break; + + case POWER_SUPPLY_PROP_MANUFACTURER: + ret = sbs_get_property_index(client, psp); + if (ret < 0) + break; + + ret = sbs_get_battery_string_property(client, ret, psp, + manufacturer); + val->strval = manufacturer; + break; + + default: + dev_err(&client->dev, + "%s: INVALID property\n", __func__); + return -EINVAL; + } + + if (!chip->enable_detection) + goto done; + + if (!chip->gpio_detect && + chip->is_present != (ret >= 0)) { + chip->is_present = (ret >= 0); + power_supply_changed(chip->power_supply); + } + +done: + if (!ret) { + /* Convert units to match requirements for power supply class */ + sbs_unit_adjustment(client, psp, val); + } + + dev_dbg(&client->dev, + "%s: property = %d, value = %x\n", __func__, psp, val->intval); + + if (ret && chip->is_present) + return ret; + + /* battery not present, so return NODATA for properties */ + if (ret) + return -ENODATA; + + return 0; +} + +static irqreturn_t sbs_irq(int irq, void *devid) +{ + struct sbs_info *chip = devid; + struct power_supply *battery = chip->power_supply; + int ret; + + ret = gpiod_get_value_cansleep(chip->gpio_detect); + if (ret < 0) + return ret; + chip->is_present = ret; + power_supply_changed(battery); + + return IRQ_HANDLED; +} + +static void sbs_external_power_changed(struct power_supply *psy) +{ + struct sbs_info *chip = power_supply_get_drvdata(psy); + + if (chip->ignore_changes > 0) { + chip->ignore_changes--; + return; + } + + /* cancel outstanding work */ + cancel_delayed_work_sync(&chip->work); + + schedule_delayed_work(&chip->work, HZ); + chip->poll_time = chip->poll_retry_count; +} + +static void sbs_delayed_work(struct work_struct *work) +{ + struct sbs_info *chip; + s32 ret; + + chip = container_of(work, struct sbs_info, work.work); + + ret = sbs_read_word_data(chip->client, sbs_data[REG_STATUS].addr); + /* if the read failed, give up on this work */ + if (ret < 0) { + chip->poll_time = 0; + return; + } + + if (ret & BATTERY_FULL_CHARGED) + ret = POWER_SUPPLY_STATUS_FULL; + else if (ret & BATTERY_DISCHARGING) + ret = POWER_SUPPLY_STATUS_DISCHARGING; + else + ret = POWER_SUPPLY_STATUS_CHARGING; + + if (chip->last_state != ret) { + chip->poll_time = 0; + power_supply_changed(chip->power_supply); + return; + } + if (chip->poll_time > 0) { + schedule_delayed_work(&chip->work, HZ); + chip->poll_time--; + return; + } +} + +static const struct power_supply_desc sbs_default_desc = { + .type = POWER_SUPPLY_TYPE_BATTERY, + .properties = sbs_properties, + .num_properties = ARRAY_SIZE(sbs_properties), + .get_property = sbs_get_property, + .external_power_changed = sbs_external_power_changed, +}; + +static int sbs_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct sbs_info *chip; + struct power_supply_desc *sbs_desc; + struct sbs_platform_data *pdata = client->dev.platform_data; + struct power_supply_config psy_cfg = {}; + int rc; + int irq; + + sbs_desc = devm_kmemdup(&client->dev, &sbs_default_desc, + sizeof(*sbs_desc), GFP_KERNEL); + if (!sbs_desc) + return -ENOMEM; + + sbs_desc->name = devm_kasprintf(&client->dev, GFP_KERNEL, "sbs-%s", + dev_name(&client->dev)); + if (!sbs_desc->name) + return -ENOMEM; + + chip = devm_kzalloc(&client->dev, sizeof(struct sbs_info), GFP_KERNEL); + if (!chip) + return -ENOMEM; + + chip->client = client; + chip->enable_detection = false; + psy_cfg.of_node = client->dev.of_node; + psy_cfg.drv_data = chip; + /* ignore first notification of external change, it is generated + * from the power_supply_register call back + */ + chip->ignore_changes = 1; + chip->last_state = POWER_SUPPLY_STATUS_UNKNOWN; + + /* use pdata if available, fall back to DT properties, + * or hardcoded defaults if not + */ + rc = of_property_read_u32(client->dev.of_node, "sbs,i2c-retry-count", + &chip->i2c_retry_count); + if (rc) + chip->i2c_retry_count = 0; + + rc = of_property_read_u32(client->dev.of_node, "sbs,poll-retry-count", + &chip->poll_retry_count); + if (rc) + chip->poll_retry_count = 0; + + if (pdata) { + chip->poll_retry_count = pdata->poll_retry_count; + chip->i2c_retry_count = pdata->i2c_retry_count; + } + chip->i2c_retry_count = chip->i2c_retry_count + 1; + + chip->gpio_detect = devm_gpiod_get_optional(&client->dev, + "sbs,battery-detect", GPIOD_IN); + if (IS_ERR(chip->gpio_detect)) { + dev_err(&client->dev, "Failed to get gpio: %ld\n", + PTR_ERR(chip->gpio_detect)); + return PTR_ERR(chip->gpio_detect); + } + + i2c_set_clientdata(client, chip); + + if (!chip->gpio_detect) + goto skip_gpio; + + irq = gpiod_to_irq(chip->gpio_detect); + if (irq <= 0) { + dev_warn(&client->dev, "Failed to get gpio as irq: %d\n", irq); + goto skip_gpio; + } + + rc = devm_request_threaded_irq(&client->dev, irq, NULL, sbs_irq, + IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING, + dev_name(&client->dev), chip); + if (rc) { + dev_warn(&client->dev, "Failed to request irq: %d\n", rc); + goto skip_gpio; + } + +skip_gpio: + /* + * Before we register, we might need to make sure we can actually talk + * to the battery. + */ + if (!(force_load || chip->gpio_detect)) { + rc = sbs_read_word_data(client, sbs_data[REG_STATUS].addr); + + if (rc < 0) { + dev_err(&client->dev, "%s: Failed to get device status\n", + __func__); + goto exit_psupply; + } + } + + chip->power_supply = devm_power_supply_register(&client->dev, sbs_desc, + &psy_cfg); + if (IS_ERR(chip->power_supply)) { + dev_err(&client->dev, + "%s: Failed to register power supply\n", __func__); + rc = PTR_ERR(chip->power_supply); + goto exit_psupply; + } + + dev_info(&client->dev, + "%s: battery gas gauge device registered\n", client->name); + + INIT_DELAYED_WORK(&chip->work, sbs_delayed_work); + + chip->enable_detection = true; + + return 0; + +exit_psupply: + return rc; +} + +static int sbs_remove(struct i2c_client *client) +{ + struct sbs_info *chip = i2c_get_clientdata(client); + + cancel_delayed_work_sync(&chip->work); + + return 0; +} + +#if defined CONFIG_PM_SLEEP + +static int sbs_suspend(struct device *dev) +{ + struct i2c_client *client = to_i2c_client(dev); + struct sbs_info *chip = i2c_get_clientdata(client); + + if (chip->poll_time > 0) + cancel_delayed_work_sync(&chip->work); + + /* + * Write to manufacturer access with sleep command. + * Support is manufacturer dependend, so ignore errors. + */ + sbs_write_word_data(client, sbs_data[REG_MANUFACTURER_DATA].addr, + MANUFACTURER_ACCESS_SLEEP); + + return 0; +} + +static SIMPLE_DEV_PM_OPS(sbs_pm_ops, sbs_suspend, NULL); +#define SBS_PM_OPS (&sbs_pm_ops) + +#else +#define SBS_PM_OPS NULL +#endif + +static const struct i2c_device_id sbs_id[] = { + { "bq20z75", 0 }, + { "sbs-battery", 1 }, + {} +}; +MODULE_DEVICE_TABLE(i2c, sbs_id); + +static const struct of_device_id sbs_dt_ids[] = { + { .compatible = "sbs,sbs-battery" }, + { .compatible = "ti,bq20z75" }, + { } +}; +MODULE_DEVICE_TABLE(of, sbs_dt_ids); + +static struct i2c_driver sbs_battery_driver = { + .probe = sbs_probe, + .remove = sbs_remove, + .id_table = sbs_id, + .driver = { + .name = "sbs-battery", + .of_match_table = sbs_dt_ids, + .pm = SBS_PM_OPS, + }, +}; +module_i2c_driver(sbs_battery_driver); + +MODULE_DESCRIPTION("SBS battery monitor driver"); +MODULE_LICENSE("GPL"); + +module_param(force_load, bool, S_IRUSR | S_IRGRP | S_IROTH); +MODULE_PARM_DESC(force_load, + "Attempt to load the driver even if no battery is connected"); |
