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