421 lines
10 KiB
C
421 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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else
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*result *= 1000;
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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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