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b6cfa007b3
This driver's remove path calls cancel_delayed_work(). However, that function does not wait until the work function finishes. This means that the callback function may still be running after the driver's remove function has finished, which would result in a use-after-free. Fix by calling cancel_delayed_work_sync(), which ensures that the work is properly cancelled, no longer running, and unable to re-schedule itself. Reported-by: Hulk Robot <hulkci@huawei.com> Signed-off-by: Yang Yingliang <yangyingliang@huawei.com> Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
418 lines
10 KiB
C
418 lines
10 KiB
C
/*
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* Generic battery driver code using IIO
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* Copyright (C) 2012, Anish Kumar <anish198519851985@gmail.com>
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* based on jz4740-battery.c
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* based on s3c_adc_battery.c
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of this archive for
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* more details.
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*
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*/
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#include <linux/interrupt.h>
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#include <linux/platform_device.h>
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#include <linux/power_supply.h>
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#include <linux/gpio/consumer.h>
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#include <linux/err.h>
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#include <linux/timer.h>
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#include <linux/jiffies.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/iio/consumer.h>
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#include <linux/iio/types.h>
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#include <linux/power/generic-adc-battery.h>
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#define JITTER_DEFAULT 10 /* hope 10ms is enough */
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enum gab_chan_type {
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GAB_VOLTAGE = 0,
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GAB_CURRENT,
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GAB_POWER,
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GAB_MAX_CHAN_TYPE
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};
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/*
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* gab_chan_name suggests the standard channel names for commonly used
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* channel types.
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*/
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static const char *const gab_chan_name[] = {
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[GAB_VOLTAGE] = "voltage",
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[GAB_CURRENT] = "current",
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[GAB_POWER] = "power",
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};
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struct gab {
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struct power_supply *psy;
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struct power_supply_desc psy_desc;
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struct iio_channel *channel[GAB_MAX_CHAN_TYPE];
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struct gab_platform_data *pdata;
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struct delayed_work bat_work;
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int level;
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int status;
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bool cable_plugged;
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struct gpio_desc *charge_finished;
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};
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static struct gab *to_generic_bat(struct power_supply *psy)
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{
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return power_supply_get_drvdata(psy);
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}
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static void gab_ext_power_changed(struct power_supply *psy)
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{
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struct gab *adc_bat = to_generic_bat(psy);
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schedule_delayed_work(&adc_bat->bat_work, msecs_to_jiffies(0));
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}
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static const enum power_supply_property gab_props[] = {
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POWER_SUPPLY_PROP_STATUS,
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POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
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POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN,
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POWER_SUPPLY_PROP_CHARGE_NOW,
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POWER_SUPPLY_PROP_VOLTAGE_NOW,
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POWER_SUPPLY_PROP_CURRENT_NOW,
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POWER_SUPPLY_PROP_TECHNOLOGY,
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POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
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POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
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POWER_SUPPLY_PROP_MODEL_NAME,
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};
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/*
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* This properties are set based on the received platform data and this
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* should correspond one-to-one with enum chan_type.
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*/
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static const enum power_supply_property gab_dyn_props[] = {
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POWER_SUPPLY_PROP_VOLTAGE_NOW,
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POWER_SUPPLY_PROP_CURRENT_NOW,
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POWER_SUPPLY_PROP_POWER_NOW,
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};
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static bool gab_charge_finished(struct gab *adc_bat)
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{
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if (!adc_bat->charge_finished)
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return false;
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return gpiod_get_value(adc_bat->charge_finished);
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}
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static int gab_get_status(struct gab *adc_bat)
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{
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struct gab_platform_data *pdata = adc_bat->pdata;
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struct power_supply_info *bat_info;
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bat_info = &pdata->battery_info;
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if (adc_bat->level == bat_info->charge_full_design)
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return POWER_SUPPLY_STATUS_FULL;
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return adc_bat->status;
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}
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static enum gab_chan_type gab_prop_to_chan(enum power_supply_property psp)
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{
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switch (psp) {
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case POWER_SUPPLY_PROP_POWER_NOW:
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return GAB_POWER;
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case POWER_SUPPLY_PROP_VOLTAGE_NOW:
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return GAB_VOLTAGE;
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case POWER_SUPPLY_PROP_CURRENT_NOW:
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return GAB_CURRENT;
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default:
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WARN_ON(1);
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break;
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}
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return GAB_POWER;
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}
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static int read_channel(struct gab *adc_bat, enum power_supply_property psp,
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int *result)
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{
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int ret;
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int chan_index;
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chan_index = gab_prop_to_chan(psp);
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ret = iio_read_channel_processed(adc_bat->channel[chan_index],
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result);
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if (ret < 0)
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pr_err("read channel error\n");
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return ret;
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}
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static int gab_get_property(struct power_supply *psy,
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enum power_supply_property psp, union power_supply_propval *val)
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{
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struct gab *adc_bat;
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struct gab_platform_data *pdata;
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struct power_supply_info *bat_info;
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int result = 0;
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int ret = 0;
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adc_bat = to_generic_bat(psy);
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if (!adc_bat) {
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dev_err(&psy->dev, "no battery infos ?!\n");
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return -EINVAL;
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}
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pdata = adc_bat->pdata;
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bat_info = &pdata->battery_info;
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switch (psp) {
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case POWER_SUPPLY_PROP_STATUS:
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val->intval = gab_get_status(adc_bat);
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break;
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case POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN:
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val->intval = 0;
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break;
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case POWER_SUPPLY_PROP_CHARGE_NOW:
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val->intval = pdata->cal_charge(result);
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break;
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case POWER_SUPPLY_PROP_VOLTAGE_NOW:
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case POWER_SUPPLY_PROP_CURRENT_NOW:
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case POWER_SUPPLY_PROP_POWER_NOW:
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ret = read_channel(adc_bat, psp, &result);
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if (ret < 0)
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goto err;
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val->intval = result;
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break;
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case POWER_SUPPLY_PROP_TECHNOLOGY:
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val->intval = bat_info->technology;
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break;
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case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
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val->intval = bat_info->voltage_min_design;
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break;
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case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
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val->intval = bat_info->voltage_max_design;
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break;
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case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
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val->intval = bat_info->charge_full_design;
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break;
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case POWER_SUPPLY_PROP_MODEL_NAME:
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val->strval = bat_info->name;
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break;
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default:
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return -EINVAL;
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}
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err:
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return ret;
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}
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static void gab_work(struct work_struct *work)
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{
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struct gab *adc_bat;
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struct delayed_work *delayed_work;
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bool is_plugged;
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int status;
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delayed_work = to_delayed_work(work);
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adc_bat = container_of(delayed_work, struct gab, bat_work);
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status = adc_bat->status;
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is_plugged = power_supply_am_i_supplied(adc_bat->psy);
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adc_bat->cable_plugged = is_plugged;
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if (!is_plugged)
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adc_bat->status = POWER_SUPPLY_STATUS_DISCHARGING;
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else if (gab_charge_finished(adc_bat))
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adc_bat->status = POWER_SUPPLY_STATUS_NOT_CHARGING;
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else
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adc_bat->status = POWER_SUPPLY_STATUS_CHARGING;
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if (status != adc_bat->status)
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power_supply_changed(adc_bat->psy);
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}
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static irqreturn_t gab_charged(int irq, void *dev_id)
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{
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struct gab *adc_bat = dev_id;
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struct gab_platform_data *pdata = adc_bat->pdata;
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int delay;
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delay = pdata->jitter_delay ? pdata->jitter_delay : JITTER_DEFAULT;
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schedule_delayed_work(&adc_bat->bat_work,
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msecs_to_jiffies(delay));
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return IRQ_HANDLED;
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}
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static int gab_probe(struct platform_device *pdev)
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{
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struct gab *adc_bat;
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struct power_supply_desc *psy_desc;
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struct power_supply_config psy_cfg = {};
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struct gab_platform_data *pdata = pdev->dev.platform_data;
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enum power_supply_property *properties;
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int ret = 0;
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int chan;
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int index = ARRAY_SIZE(gab_props);
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bool any = false;
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adc_bat = devm_kzalloc(&pdev->dev, sizeof(*adc_bat), GFP_KERNEL);
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if (!adc_bat) {
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dev_err(&pdev->dev, "failed to allocate memory\n");
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return -ENOMEM;
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}
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psy_cfg.drv_data = adc_bat;
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psy_desc = &adc_bat->psy_desc;
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psy_desc->name = pdata->battery_info.name;
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/* bootup default values for the battery */
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adc_bat->cable_plugged = false;
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adc_bat->status = POWER_SUPPLY_STATUS_DISCHARGING;
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psy_desc->type = POWER_SUPPLY_TYPE_BATTERY;
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psy_desc->get_property = gab_get_property;
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psy_desc->external_power_changed = gab_ext_power_changed;
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adc_bat->pdata = pdata;
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/*
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* copying the static properties and allocating extra memory for holding
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* the extra configurable properties received from platform data.
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*/
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properties = kcalloc(ARRAY_SIZE(gab_props) +
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ARRAY_SIZE(gab_chan_name),
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sizeof(*properties),
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GFP_KERNEL);
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if (!properties) {
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ret = -ENOMEM;
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goto first_mem_fail;
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}
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memcpy(properties, gab_props, sizeof(gab_props));
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/*
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* getting channel from iio and copying the battery properties
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* based on the channel supported by consumer device.
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*/
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for (chan = 0; chan < ARRAY_SIZE(gab_chan_name); chan++) {
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adc_bat->channel[chan] = iio_channel_get(&pdev->dev,
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gab_chan_name[chan]);
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if (IS_ERR(adc_bat->channel[chan])) {
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ret = PTR_ERR(adc_bat->channel[chan]);
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adc_bat->channel[chan] = NULL;
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} else {
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/* copying properties for supported channels only */
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int index2;
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for (index2 = 0; index2 < index; index2++) {
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if (properties[index2] == gab_dyn_props[chan])
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break; /* already known */
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}
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if (index2 == index) /* really new */
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properties[index++] = gab_dyn_props[chan];
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any = true;
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}
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}
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/* none of the channels are supported so let's bail out */
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if (!any) {
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ret = -ENODEV;
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goto second_mem_fail;
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}
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/*
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* Total number of properties is equal to static properties
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* plus the dynamic properties.Some properties may not be set
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* as come channels may be not be supported by the device.So
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* we need to take care of that.
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*/
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psy_desc->properties = properties;
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psy_desc->num_properties = index;
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adc_bat->psy = power_supply_register(&pdev->dev, psy_desc, &psy_cfg);
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if (IS_ERR(adc_bat->psy)) {
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ret = PTR_ERR(adc_bat->psy);
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goto err_reg_fail;
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}
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INIT_DELAYED_WORK(&adc_bat->bat_work, gab_work);
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adc_bat->charge_finished = devm_gpiod_get_optional(&pdev->dev,
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"charged", GPIOD_IN);
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if (adc_bat->charge_finished) {
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int irq;
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irq = gpiod_to_irq(adc_bat->charge_finished);
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ret = request_any_context_irq(irq, gab_charged,
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IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
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"battery charged", adc_bat);
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if (ret < 0)
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goto gpio_req_fail;
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}
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platform_set_drvdata(pdev, adc_bat);
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/* Schedule timer to check current status */
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schedule_delayed_work(&adc_bat->bat_work,
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msecs_to_jiffies(0));
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return 0;
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gpio_req_fail:
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power_supply_unregister(adc_bat->psy);
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err_reg_fail:
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for (chan = 0; chan < ARRAY_SIZE(gab_chan_name); chan++) {
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if (adc_bat->channel[chan])
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iio_channel_release(adc_bat->channel[chan]);
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}
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second_mem_fail:
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kfree(properties);
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first_mem_fail:
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return ret;
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}
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static int gab_remove(struct platform_device *pdev)
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{
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int chan;
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struct gab *adc_bat = platform_get_drvdata(pdev);
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power_supply_unregister(adc_bat->psy);
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if (adc_bat->charge_finished)
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free_irq(gpiod_to_irq(adc_bat->charge_finished), adc_bat);
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for (chan = 0; chan < ARRAY_SIZE(gab_chan_name); chan++) {
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if (adc_bat->channel[chan])
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iio_channel_release(adc_bat->channel[chan]);
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}
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kfree(adc_bat->psy_desc.properties);
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cancel_delayed_work_sync(&adc_bat->bat_work);
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return 0;
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}
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static int __maybe_unused gab_suspend(struct device *dev)
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{
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struct gab *adc_bat = dev_get_drvdata(dev);
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cancel_delayed_work_sync(&adc_bat->bat_work);
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adc_bat->status = POWER_SUPPLY_STATUS_UNKNOWN;
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return 0;
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}
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static int __maybe_unused gab_resume(struct device *dev)
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{
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struct gab *adc_bat = dev_get_drvdata(dev);
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struct gab_platform_data *pdata = adc_bat->pdata;
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int delay;
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delay = pdata->jitter_delay ? pdata->jitter_delay : JITTER_DEFAULT;
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/* Schedule timer to check current status */
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schedule_delayed_work(&adc_bat->bat_work,
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msecs_to_jiffies(delay));
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return 0;
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}
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static SIMPLE_DEV_PM_OPS(gab_pm_ops, gab_suspend, gab_resume);
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static struct platform_driver gab_driver = {
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.driver = {
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.name = "generic-adc-battery",
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.pm = &gab_pm_ops,
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},
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.probe = gab_probe,
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.remove = gab_remove,
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};
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module_platform_driver(gab_driver);
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MODULE_AUTHOR("anish kumar <anish198519851985@gmail.com>");
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MODULE_DESCRIPTION("generic battery driver using IIO");
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MODULE_LICENSE("GPL");
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