diff options
Diffstat (limited to 'drivers/power/bq20z75.c')
| -rw-r--r-- | drivers/power/bq20z75.c | 493 |
1 files changed, 0 insertions, 493 deletions
diff --git a/drivers/power/bq20z75.c b/drivers/power/bq20z75.c deleted file mode 100644 index 492da27e1a4..00000000000 --- a/drivers/power/bq20z75.c +++ /dev/null @@ -1,493 +0,0 @@ -/* - * 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> - -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_FULL_CHARGE_CAPACITY, - REG_DESIGN_CAPACITY, - REG_DESIGN_VOLTAGE, -}; - -/* 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_FULL_CHARGE_CAPACITY] = - BQ20Z75_DATA(POWER_SUPPLY_PROP_ENERGY_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_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, -}; - -struct bq20z75_info { - struct i2c_client *client; - struct power_supply power_supply; -}; - -static int bq20z75_read_word_data(struct i2c_client *client, u8 address) -{ - s32 ret; - - ret = i2c_smbus_read_word_data(client, address); - if (ret < 0) { - dev_err(&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) -{ - s32 ret; - - ret = i2c_smbus_write_word_data(client, address, le16_to_cpu(value)); - if (ret < 0) { - dev_err(&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; - - /* 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) - 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) -{ - 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) { - 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; - } - } 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 600 -#define TEMP_KELVIN_TO_CELCIUS 2731 - switch (psp) { - case POWER_SUPPLY_PROP_ENERGY_NOW: - case POWER_SUPPLY_PROP_ENERGY_FULL: - case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN: - 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: - val->intval *= BASE_UNIT_CONVERSION; - break; - - case POWER_SUPPLY_PROP_TEMP: - /* bq20z75 provides battery tempreture in 0.1°K - * so convert it to 0.1°C */ - val->intval -= TEMP_KELVIN_TO_CELCIUS; - val->intval *= 10; - break; - - case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG: - case POWER_SUPPLY_PROP_TIME_TO_FULL_AVG: - val->intval *= TIME_UNIT_CONVERSION; - break; - - default: - dev_dbg(&client->dev, - "%s: no need for unit conversion %d\n", __func__, psp); - } -} - -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; - - 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; - - 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(struct power_supply *psy, - enum power_supply_property psp, - union power_supply_propval *val) -{ - int count; - int ret; - 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 (ret) - return ret; - 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_CAPACITY: - for (count = 0; count < ARRAY_SIZE(bq20z75_data); count++) { - if (psp == bq20z75_data[count].psp) - break; - } - - ret = bq20z75_get_battery_capacity(client, count, psp, val); - if (ret) - return ret; - - break; - - case POWER_SUPPLY_PROP_SERIAL_NUMBER: - ret = bq20z75_get_battery_serial_number(client, val); - if (ret) - return ret; - 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: - for (count = 0; count < ARRAY_SIZE(bq20z75_data); count++) { - if (psp == bq20z75_data[count].psp) - break; - } - - ret = bq20z75_get_battery_property(client, count, psp, val); - if (ret) - return ret; - - break; - - default: - dev_err(&client->dev, - "%s: INVALID property\n", __func__); - return -EINVAL; - } - - /* Convert units to match requirements for power supply class */ - bq20z75_unit_adjustment(client, psp, val); - - dev_dbg(&client->dev, - "%s: property = %d, value = %d\n", __func__, psp, val->intval); - - return 0; -} - -static int bq20z75_probe(struct i2c_client *client, - const struct i2c_device_id *id) -{ - struct bq20z75_info *bq20z75_device; - int rc; - - bq20z75_device = kzalloc(sizeof(struct bq20z75_info), GFP_KERNEL); - if (!bq20z75_device) - return -ENOMEM; - - bq20z75_device->client = client; - 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; - - i2c_set_clientdata(client, bq20z75_device); - - rc = power_supply_register(&client->dev, &bq20z75_device->power_supply); - if (rc) { - dev_err(&client->dev, - "%s: Failed to register power supply\n", __func__); - kfree(bq20z75_device); - return rc; - } - - dev_info(&client->dev, - "%s: battery gas gauge device registered\n", client->name); - - return 0; -} - -static int bq20z75_remove(struct i2c_client *client) -{ - struct bq20z75_info *bq20z75_device = i2c_get_clientdata(client); - - power_supply_unregister(&bq20z75_device->power_supply); - kfree(bq20z75_device); - bq20z75_device = NULL; - - return 0; -} - -#if defined CONFIG_PM -static int bq20z75_suspend(struct i2c_client *client, - pm_message_t state) -{ - s32 ret; - - /* write to manufacturer access with sleep command */ - ret = bq20z75_write_word_data(client, - bq20z75_data[REG_MANUFACTURER_DATA].addr, - MANUFACTURER_ACCESS_SLEEP); - if (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 }, - {} -}; - -static struct i2c_driver bq20z75_battery_driver = { - .probe = bq20z75_probe, - .remove = bq20z75_remove, - .suspend = bq20z75_suspend, - .resume = bq20z75_resume, - .id_table = bq20z75_id, - .driver = { - .name = "bq20z75-battery", - }, -}; - -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"); |