--- /dev/null
+/*
+ * 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.h>
+#include <linux/of.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_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_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_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_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;
+ struct sbs_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 char model_name[I2C_SMBUS_BLOCK_MAX + 1];
+static char manufacturer[I2C_SMBUS_BLOCK_MAX + 1];
+
+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;
+
+ if (chip->pdata)
+ retries = max(chip->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 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];
+
+ if (chip->pdata) {
+ retries_length = max(chip->pdata->i2c_retry_count + 1, 1);
+ retries_block = max(chip->pdata->i2c_retry_count + 1, 1);
+ }
+
+ /* 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;
+
+ if (chip->pdata)
+ retries = max(chip->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 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 = gpio_get_value(chip->pdata->battery_detect);
+ if (ret == chip->pdata->battery_detect_present)
+ val->intval = 1;
+ else
+ val->intval = 0;
+ chip->is_present = val->intval;
+ return ret;
+ }
+
+ /* Write to ManufacturerAccess with
+ * ManufacturerAccess command and then
+ * read the status */
+ ret = sbs_write_word_data(client, sbs_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 = sbs_read_word_data(client, sbs_data[REG_MANUFACTURER_DATA].addr);
+ if (ret < 0)
+ 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_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 (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_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 power_supply *battery = devid;
+
+ 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->pdata->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_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 (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;
+ }
+}
+
+#if defined(CONFIG_OF)
+
+#include <linux/of_device.h>
+#include <linux/of_gpio.h>
+
+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 sbs_platform_data *sbs_of_populate_pdata(
+ struct i2c_client *client)
+{
+ struct device_node *of_node = client->dev.of_node;
+ struct sbs_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, "sbs,i2c-retry-count", NULL) &&
+ !of_get_property(of_node, "sbs,poll-retry-count", NULL) &&
+ !of_get_property(of_node, "sbs,battery-detect-gpios", NULL))
+ goto of_out;
+
+ pdata = devm_kzalloc(&client->dev, sizeof(struct sbs_platform_data),
+ GFP_KERNEL);
+ if (!pdata)
+ goto of_out;
+
+ rc = of_property_read_u32(of_node, "sbs,i2c-retry-count", &prop);
+ if (!rc)
+ pdata->i2c_retry_count = prop;
+
+ rc = of_property_read_u32(of_node, "sbs,poll-retry-count", &prop);
+ if (!rc)
+ pdata->poll_retry_count = prop;
+
+ if (!of_get_property(of_node, "sbs,battery-detect-gpios", NULL)) {
+ pdata->battery_detect = -1;
+ goto of_out;
+ }
+
+ pdata->battery_detect = of_get_named_gpio_flags(of_node,
+ "sbs,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
+static struct sbs_platform_data *sbs_of_populate_pdata(
+ struct i2c_client *client)
+{
+ return client->dev.platform_data;
+}
+#endif
+
+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 = kzalloc(sizeof(struct sbs_info), GFP_KERNEL);
+ if (!chip)
+ return -ENOMEM;
+
+ chip->client = client;
+ chip->enable_detection = false;
+ chip->gpio_detect = 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;
+
+ pdata = sbs_of_populate_pdata(client);
+
+ if (pdata) {
+ chip->gpio_detect = gpio_is_valid(pdata->battery_detect);
+ chip->pdata = pdata;
+ }
+
+ i2c_set_clientdata(client, chip);
+
+ if (!chip->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);
+ chip->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);
+ chip->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);
+ chip->gpio_detect = false;
+ goto skip_gpio;
+ }
+
+ rc = request_irq(irq, sbs_irq,
+ IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
+ dev_name(&client->dev), chip->power_supply);
+ if (rc) {
+ dev_warn(&client->dev, "Failed to request irq: %d\n", rc);
+ gpio_free(pdata->battery_detect);
+ chip->gpio_detect = false;
+ goto skip_gpio;
+ }
+
+ chip->irq = irq;
+
+skip_gpio:
+ /*
+ * Before we register, we need to make sure we can actually talk
+ * to the battery.
+ */
+ 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 = 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:
+ if (chip->irq)
+ free_irq(chip->irq, chip->power_supply);
+ if (chip->gpio_detect)
+ gpio_free(pdata->battery_detect);
+
+ kfree(chip);
+
+ return rc;
+}
+
+static int sbs_remove(struct i2c_client *client)
+{
+ struct sbs_info *chip = i2c_get_clientdata(client);
+
+ if (chip->irq)
+ free_irq(chip->irq, chip->power_supply);
+ if (chip->gpio_detect)
+ gpio_free(chip->pdata->battery_detect);
+
+ power_supply_unregister(chip->power_supply);
+
+ cancel_delayed_work_sync(&chip->work);
+
+ kfree(chip);
+ chip = NULL;
+
+ 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);
+ s32 ret;
+
+ if (chip->poll_time > 0)
+ cancel_delayed_work_sync(&chip->work);
+
+ /* write to manufacturer access with sleep command */
+ ret = sbs_write_word_data(client, sbs_data[REG_MANUFACTURER_DATA].addr,
+ MANUFACTURER_ACCESS_SLEEP);
+ if (chip->is_present && ret < 0)
+ return ret;
+
+ 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 struct i2c_driver sbs_battery_driver = {
+ .probe = sbs_probe,
+ .remove = sbs_remove,
+ .id_table = sbs_id,
+ .driver = {
+ .name = "sbs-battery",
+ .of_match_table = of_match_ptr(sbs_dt_ids),
+ .pm = SBS_PM_OPS,
+ },
+};
+module_i2c_driver(sbs_battery_driver);
+
+MODULE_DESCRIPTION("SBS battery monitor driver");
+MODULE_LICENSE("GPL");
Code Review / kvmfornfv.git / blobdiff