284 lines
6.7 KiB
C
284 lines
6.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Battery measurement code for WM97xx
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*
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* based on tosa_battery.c
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*
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* Copyright (C) 2008 Marek Vasut <marek.vasut@gmail.com>
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*/
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.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/wm97xx.h>
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#include <linux/spinlock.h>
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#include <linux/interrupt.h>
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#include <linux/gpio.h>
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#include <linux/irq.h>
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#include <linux/slab.h>
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static struct work_struct bat_work;
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static DEFINE_MUTEX(work_lock);
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static int bat_status = POWER_SUPPLY_STATUS_UNKNOWN;
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static enum power_supply_property *prop;
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static unsigned long wm97xx_read_bat(struct power_supply *bat_ps)
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{
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struct wm97xx_batt_pdata *pdata = power_supply_get_drvdata(bat_ps);
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return wm97xx_read_aux_adc(dev_get_drvdata(bat_ps->dev.parent),
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pdata->batt_aux) * pdata->batt_mult /
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pdata->batt_div;
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}
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static unsigned long wm97xx_read_temp(struct power_supply *bat_ps)
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{
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struct wm97xx_batt_pdata *pdata = power_supply_get_drvdata(bat_ps);
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return wm97xx_read_aux_adc(dev_get_drvdata(bat_ps->dev.parent),
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pdata->temp_aux) * pdata->temp_mult /
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pdata->temp_div;
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}
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static int wm97xx_bat_get_property(struct power_supply *bat_ps,
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enum power_supply_property psp,
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union power_supply_propval *val)
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{
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struct wm97xx_batt_pdata *pdata = power_supply_get_drvdata(bat_ps);
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switch (psp) {
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case POWER_SUPPLY_PROP_STATUS:
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val->intval = bat_status;
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break;
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case POWER_SUPPLY_PROP_TECHNOLOGY:
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val->intval = pdata->batt_tech;
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break;
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case POWER_SUPPLY_PROP_VOLTAGE_NOW:
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if (pdata->batt_aux >= 0)
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val->intval = wm97xx_read_bat(bat_ps);
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else
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return -EINVAL;
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break;
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case POWER_SUPPLY_PROP_TEMP:
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if (pdata->temp_aux >= 0)
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val->intval = wm97xx_read_temp(bat_ps);
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else
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return -EINVAL;
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break;
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case POWER_SUPPLY_PROP_VOLTAGE_MAX:
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if (pdata->max_voltage >= 0)
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val->intval = pdata->max_voltage;
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else
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return -EINVAL;
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break;
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case POWER_SUPPLY_PROP_VOLTAGE_MIN:
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if (pdata->min_voltage >= 0)
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val->intval = pdata->min_voltage;
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else
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return -EINVAL;
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break;
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case POWER_SUPPLY_PROP_PRESENT:
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val->intval = 1;
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static void wm97xx_bat_external_power_changed(struct power_supply *bat_ps)
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{
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schedule_work(&bat_work);
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}
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static void wm97xx_bat_update(struct power_supply *bat_ps)
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{
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int old_status = bat_status;
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struct wm97xx_batt_pdata *pdata = power_supply_get_drvdata(bat_ps);
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mutex_lock(&work_lock);
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bat_status = (pdata->charge_gpio >= 0) ?
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(gpio_get_value(pdata->charge_gpio) ?
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POWER_SUPPLY_STATUS_DISCHARGING :
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POWER_SUPPLY_STATUS_CHARGING) :
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POWER_SUPPLY_STATUS_UNKNOWN;
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if (old_status != bat_status) {
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pr_debug("%s: %i -> %i\n", bat_ps->desc->name, old_status,
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bat_status);
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power_supply_changed(bat_ps);
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}
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mutex_unlock(&work_lock);
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}
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static struct power_supply *bat_psy;
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static struct power_supply_desc bat_psy_desc = {
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.type = POWER_SUPPLY_TYPE_BATTERY,
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.get_property = wm97xx_bat_get_property,
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.external_power_changed = wm97xx_bat_external_power_changed,
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.use_for_apm = 1,
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};
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static void wm97xx_bat_work(struct work_struct *work)
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{
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wm97xx_bat_update(bat_psy);
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}
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static irqreturn_t wm97xx_chrg_irq(int irq, void *data)
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{
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schedule_work(&bat_work);
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return IRQ_HANDLED;
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}
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#ifdef CONFIG_PM
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static int wm97xx_bat_suspend(struct device *dev)
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{
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flush_work(&bat_work);
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return 0;
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}
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static int wm97xx_bat_resume(struct device *dev)
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{
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schedule_work(&bat_work);
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return 0;
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}
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static const struct dev_pm_ops wm97xx_bat_pm_ops = {
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.suspend = wm97xx_bat_suspend,
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.resume = wm97xx_bat_resume,
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};
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#endif
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static int wm97xx_bat_probe(struct platform_device *dev)
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{
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int ret = 0;
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int props = 1; /* POWER_SUPPLY_PROP_PRESENT */
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int i = 0;
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struct wm97xx_batt_pdata *pdata = dev->dev.platform_data;
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struct power_supply_config cfg = {};
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if (!pdata) {
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dev_err(&dev->dev, "No platform data supplied\n");
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return -EINVAL;
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}
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cfg.drv_data = pdata;
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if (dev->id != -1)
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return -EINVAL;
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if (gpio_is_valid(pdata->charge_gpio)) {
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ret = gpio_request(pdata->charge_gpio, "BATT CHRG");
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if (ret)
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goto err;
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ret = gpio_direction_input(pdata->charge_gpio);
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if (ret)
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goto err2;
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ret = request_irq(gpio_to_irq(pdata->charge_gpio),
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wm97xx_chrg_irq, 0,
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"AC Detect", dev);
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if (ret)
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goto err2;
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props++; /* POWER_SUPPLY_PROP_STATUS */
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}
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if (pdata->batt_tech >= 0)
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props++; /* POWER_SUPPLY_PROP_TECHNOLOGY */
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if (pdata->temp_aux >= 0)
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props++; /* POWER_SUPPLY_PROP_TEMP */
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if (pdata->batt_aux >= 0)
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props++; /* POWER_SUPPLY_PROP_VOLTAGE_NOW */
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if (pdata->max_voltage >= 0)
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props++; /* POWER_SUPPLY_PROP_VOLTAGE_MAX */
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if (pdata->min_voltage >= 0)
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props++; /* POWER_SUPPLY_PROP_VOLTAGE_MIN */
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prop = kcalloc(props, sizeof(*prop), GFP_KERNEL);
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if (!prop) {
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ret = -ENOMEM;
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goto err3;
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}
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prop[i++] = POWER_SUPPLY_PROP_PRESENT;
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if (pdata->charge_gpio >= 0)
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prop[i++] = POWER_SUPPLY_PROP_STATUS;
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if (pdata->batt_tech >= 0)
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prop[i++] = POWER_SUPPLY_PROP_TECHNOLOGY;
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if (pdata->temp_aux >= 0)
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prop[i++] = POWER_SUPPLY_PROP_TEMP;
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if (pdata->batt_aux >= 0)
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prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_NOW;
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if (pdata->max_voltage >= 0)
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prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_MAX;
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if (pdata->min_voltage >= 0)
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prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_MIN;
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INIT_WORK(&bat_work, wm97xx_bat_work);
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if (!pdata->batt_name) {
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dev_info(&dev->dev, "Please consider setting proper battery "
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"name in platform definition file, falling "
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"back to name \"wm97xx-batt\"\n");
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bat_psy_desc.name = "wm97xx-batt";
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} else
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bat_psy_desc.name = pdata->batt_name;
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bat_psy_desc.properties = prop;
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bat_psy_desc.num_properties = props;
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bat_psy = power_supply_register(&dev->dev, &bat_psy_desc, &cfg);
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if (!IS_ERR(bat_psy)) {
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schedule_work(&bat_work);
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} else {
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ret = PTR_ERR(bat_psy);
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goto err4;
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}
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return 0;
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err4:
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kfree(prop);
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err3:
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if (gpio_is_valid(pdata->charge_gpio))
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free_irq(gpio_to_irq(pdata->charge_gpio), dev);
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err2:
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if (gpio_is_valid(pdata->charge_gpio))
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gpio_free(pdata->charge_gpio);
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err:
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return ret;
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}
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static int wm97xx_bat_remove(struct platform_device *dev)
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{
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struct wm97xx_batt_pdata *pdata = dev->dev.platform_data;
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if (pdata && gpio_is_valid(pdata->charge_gpio)) {
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free_irq(gpio_to_irq(pdata->charge_gpio), dev);
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gpio_free(pdata->charge_gpio);
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}
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cancel_work_sync(&bat_work);
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power_supply_unregister(bat_psy);
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kfree(prop);
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return 0;
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}
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static struct platform_driver wm97xx_bat_driver = {
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.driver = {
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.name = "wm97xx-battery",
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#ifdef CONFIG_PM
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.pm = &wm97xx_bat_pm_ops,
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#endif
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},
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.probe = wm97xx_bat_probe,
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.remove = wm97xx_bat_remove,
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};
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module_platform_driver(wm97xx_bat_driver);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
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MODULE_DESCRIPTION("WM97xx battery driver");
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