diff options
Diffstat (limited to 'drivers/power/sbs-battery.c')
| -rw-r--r-- | drivers/power/sbs-battery.c | 871 |
1 files changed, 871 insertions, 0 deletions
diff --git a/drivers/power/sbs-battery.c b/drivers/power/sbs-battery.c new file mode 100644 index 000000000000..ce95ff791016 --- /dev/null +++ b/drivers/power/sbs-battery.c @@ -0,0 +1,871 @@ +/* + * 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"); |