/* * Battery measurement code for Ingenic JZ SOC. * * Copyright (C) 2009 Jiejing Zhang <kzjeef@gmail.com> * Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de> * * based on tosa_battery.c * * Copyright (C) 2008 Marek Vasut <marek.vasut@gmail.com> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * */ #include <linux/interrupt.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/platform_device.h> #include <linux/slab.h> #include <linux/io.h> #include <linux/delay.h> #include <linux/gpio.h> #include <linux/mfd/core.h> #include <linux/power_supply.h> #include <linux/power/jz4740-battery.h> #include <linux/jz4740-adc.h> struct jz_battery { struct jz_battery_platform_data *pdata; struct platform_device *pdev; struct resource *mem; void __iomem *base; int irq; int charge_irq; const struct mfd_cell *cell; int status; long voltage; struct completion read_completion; struct power_supply battery; struct delayed_work work; struct mutex lock; }; static inline struct jz_battery *psy_to_jz_battery(struct power_supply *psy) { return container_of(psy, struct jz_battery, battery); } static irqreturn_t jz_battery_irq_handler(int irq, void *devid) { struct jz_battery *battery = devid; complete(&battery->read_completion); return IRQ_HANDLED; } static long jz_battery_read_voltage(struct jz_battery *battery) { unsigned long t; unsigned long val; long voltage; mutex_lock(&battery->lock); INIT_COMPLETION(battery->read_completion); enable_irq(battery->irq); battery->cell->enable(battery->pdev); t = wait_for_completion_interruptible_timeout(&battery->read_completion, HZ); if (t > 0) { val = readw(battery->base) & 0xfff; if (battery->pdata->info.voltage_max_design <= 2500000) val = (val * 78125UL) >> 7UL; else val = ((val * 924375UL) >> 9UL) + 33000; voltage = (long)val; } else { voltage = t ? t : -ETIMEDOUT; } battery->cell->disable(battery->pdev); disable_irq(battery->irq); mutex_unlock(&battery->lock); return voltage; } static int jz_battery_get_capacity(struct power_supply *psy) { struct jz_battery *jz_battery = psy_to_jz_battery(psy); struct power_supply_info *info = &jz_battery->pdata->info; long voltage; int ret; int voltage_span; voltage = jz_battery_read_voltage(jz_battery); if (voltage < 0) return voltage; voltage_span = info->voltage_max_design - info->voltage_min_design; ret = ((voltage - info->voltage_min_design) * 100) / voltage_span; if (ret > 100) ret = 100; else if (ret < 0) ret = 0; return ret; } static int jz_battery_get_property(struct power_supply *psy, enum power_supply_property psp, union power_supply_propval *val) { struct jz_battery *jz_battery = psy_to_jz_battery(psy); struct power_supply_info *info = &jz_battery->pdata->info; long voltage; switch (psp) { case POWER_SUPPLY_PROP_STATUS: val->intval = jz_battery->status; break; case POWER_SUPPLY_PROP_TECHNOLOGY: val->intval = jz_battery->pdata->info.technology; break; case POWER_SUPPLY_PROP_HEALTH: voltage = jz_battery_read_voltage(jz_battery); if (voltage < info->voltage_min_design) val->intval = POWER_SUPPLY_HEALTH_DEAD; else val->intval = POWER_SUPPLY_HEALTH_GOOD; break; case POWER_SUPPLY_PROP_CAPACITY: val->intval = jz_battery_get_capacity(psy); break; case POWER_SUPPLY_PROP_VOLTAGE_NOW: val->intval = jz_battery_read_voltage(jz_battery); if (val->intval < 0) return val->intval; break; case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN: val->intval = info->voltage_max_design; break; case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN: val->intval = info->voltage_min_design; break; case POWER_SUPPLY_PROP_PRESENT: val->intval = 1; break; default: return -EINVAL; } return 0; } static void jz_battery_external_power_changed(struct power_supply *psy) { struct jz_battery *jz_battery = psy_to_jz_battery(psy); cancel_delayed_work(&jz_battery->work); schedule_delayed_work(&jz_battery->work, 0); } static irqreturn_t jz_battery_charge_irq(int irq, void *data) { struct jz_battery *jz_battery = data; cancel_delayed_work(&jz_battery->work); schedule_delayed_work(&jz_battery->work, 0); return IRQ_HANDLED; } static void jz_battery_update(struct jz_battery *jz_battery) { int status; long voltage; bool has_changed = false; int is_charging; if (gpio_is_valid(jz_battery->pdata->gpio_charge)) { is_charging = gpio_get_value(jz_battery->pdata->gpio_charge); is_charging ^= jz_battery->pdata->gpio_charge_active_low; if (is_charging) status = POWER_SUPPLY_STATUS_CHARGING; else status = POWER_SUPPLY_STATUS_NOT_CHARGING; if (status != jz_battery->status) { jz_battery->status = status; has_changed = true; } } voltage = jz_battery_read_voltage(jz_battery); if (abs(voltage - jz_battery->voltage) < 50000) { jz_battery->voltage = voltage; has_changed = true; } if (has_changed) power_supply_changed(&jz_battery->battery); } static enum power_supply_property jz_battery_properties[] = { POWER_SUPPLY_PROP_STATUS, POWER_SUPPLY_PROP_TECHNOLOGY, POWER_SUPPLY_PROP_HEALTH, POWER_SUPPLY_PROP_CAPACITY, POWER_SUPPLY_PROP_VOLTAGE_NOW, POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN, POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, POWER_SUPPLY_PROP_PRESENT, }; static void jz_battery_work(struct work_struct *work) { /* Too small interval will increase system workload */ const int interval = HZ * 30; struct jz_battery *jz_battery = container_of(work, struct jz_battery, work.work); jz_battery_update(jz_battery); schedule_delayed_work(&jz_battery->work, interval); } static int __devinit jz_battery_probe(struct platform_device *pdev) { int ret = 0; struct jz_battery_platform_data *pdata = pdev->dev.parent->platform_data; struct jz_battery *jz_battery; struct power_supply *battery; if (!pdata) { dev_err(&pdev->dev, "No platform_data supplied\n"); return -ENXIO; } jz_battery = kzalloc(sizeof(*jz_battery), GFP_KERNEL); if (!jz_battery) { dev_err(&pdev->dev, "Failed to allocate driver structure\n"); return -ENOMEM; } jz_battery->cell = mfd_get_cell(pdev); jz_battery->irq = platform_get_irq(pdev, 0); if (jz_battery->irq < 0) { ret = jz_battery->irq; dev_err(&pdev->dev, "Failed to get platform irq: %d\n", ret); goto err_free; } jz_battery->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!jz_battery->mem) { ret = -ENOENT; dev_err(&pdev->dev, "Failed to get platform mmio resource\n"); goto err_free; } jz_battery->mem = request_mem_region(jz_battery->mem->start, resource_size(jz_battery->mem), pdev->name); if (!jz_battery->mem) { ret = -EBUSY; dev_err(&pdev->dev, "Failed to request mmio memory region\n"); goto err_free; } jz_battery->base = ioremap_nocache(jz_battery->mem->start, resource_size(jz_battery->mem)); if (!jz_battery->base) { ret = -EBUSY; dev_err(&pdev->dev, "Failed to ioremap mmio memory\n"); goto err_release_mem_region; } battery = &jz_battery->battery; battery->name = pdata->info.name; battery->type = POWER_SUPPLY_TYPE_BATTERY; battery->properties = jz_battery_properties; battery->num_properties = ARRAY_SIZE(jz_battery_properties); battery->get_property = jz_battery_get_property; battery->external_power_changed = jz_battery_external_power_changed; battery->use_for_apm = 1; jz_battery->pdata = pdata; jz_battery->pdev = pdev; init_completion(&jz_battery->read_completion); mutex_init(&jz_battery->lock); INIT_DELAYED_WORK(&jz_battery->work, jz_battery_work); ret = request_irq(jz_battery->irq, jz_battery_irq_handler, 0, pdev->name, jz_battery); if (ret) { dev_err(&pdev->dev, "Failed to request irq %d\n", ret); goto err_iounmap; } disable_irq(jz_battery->irq); if (gpio_is_valid(pdata->gpio_charge)) { ret = gpio_request(pdata->gpio_charge, dev_name(&pdev->dev)); if (ret) { dev_err(&pdev->dev, "charger state gpio request failed.\n"); goto err_free_irq; } ret = gpio_direction_input(pdata->gpio_charge); if (ret) { dev_err(&pdev->dev, "charger state gpio set direction failed.\n"); goto err_free_gpio; } jz_battery->charge_irq = gpio_to_irq(pdata->gpio_charge); if (jz_battery->charge_irq >= 0) { ret = request_irq(jz_battery->charge_irq, jz_battery_charge_irq, IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING, dev_name(&pdev->dev), jz_battery); if (ret) { dev_err(&pdev->dev, "Failed to request charge irq: %d\n", ret); goto err_free_gpio; } } } else { jz_battery->charge_irq = -1; } if (jz_battery->pdata->info.voltage_max_design <= 2500000) jz4740_adc_set_config(pdev->dev.parent, JZ_ADC_CONFIG_BAT_MB, JZ_ADC_CONFIG_BAT_MB); else jz4740_adc_set_config(pdev->dev.parent, JZ_ADC_CONFIG_BAT_MB, 0); ret = power_supply_register(&pdev->dev, &jz_battery->battery); if (ret) { dev_err(&pdev->dev, "power supply battery register failed.\n"); goto err_free_charge_irq; } platform_set_drvdata(pdev, jz_battery); schedule_delayed_work(&jz_battery->work, 0); return 0; err_free_charge_irq: if (jz_battery->charge_irq >= 0) free_irq(jz_battery->charge_irq, jz_battery); err_free_gpio: if (gpio_is_valid(pdata->gpio_charge)) gpio_free(jz_battery->pdata->gpio_charge); err_free_irq: free_irq(jz_battery->irq, jz_battery); err_iounmap: platform_set_drvdata(pdev, NULL); iounmap(jz_battery->base); err_release_mem_region: release_mem_region(jz_battery->mem->start, resource_size(jz_battery->mem)); err_free: kfree(jz_battery); return ret; } static int __devexit jz_battery_remove(struct platform_device *pdev) { struct jz_battery *jz_battery = platform_get_drvdata(pdev); cancel_delayed_work_sync(&jz_battery->work); if (gpio_is_valid(jz_battery->pdata->gpio_charge)) { if (jz_battery->charge_irq >= 0) free_irq(jz_battery->charge_irq, jz_battery); gpio_free(jz_battery->pdata->gpio_charge); } power_supply_unregister(&jz_battery->battery); free_irq(jz_battery->irq, jz_battery); iounmap(jz_battery->base); release_mem_region(jz_battery->mem->start, resource_size(jz_battery->mem)); kfree(jz_battery); return 0; } #ifdef CONFIG_PM static int jz_battery_suspend(struct device *dev) { struct jz_battery *jz_battery = dev_get_drvdata(dev); cancel_delayed_work_sync(&jz_battery->work); jz_battery->status = POWER_SUPPLY_STATUS_UNKNOWN; return 0; } static int jz_battery_resume(struct device *dev) { struct jz_battery *jz_battery = dev_get_drvdata(dev); schedule_delayed_work(&jz_battery->work, 0); return 0; } static const struct dev_pm_ops jz_battery_pm_ops = { .suspend = jz_battery_suspend, .resume = jz_battery_resume, }; #define JZ_BATTERY_PM_OPS (&jz_battery_pm_ops) #else #define JZ_BATTERY_PM_OPS NULL #endif static struct platform_driver jz_battery_driver = { .probe = jz_battery_probe, .remove = __devexit_p(jz_battery_remove), .driver = { .name = "jz4740-battery", .owner = THIS_MODULE, .pm = JZ_BATTERY_PM_OPS, }, }; static int __init jz_battery_init(void) { return platform_driver_register(&jz_battery_driver); } module_init(jz_battery_init); static void __exit jz_battery_exit(void) { platform_driver_unregister(&jz_battery_driver); } module_exit(jz_battery_exit); MODULE_ALIAS("platform:jz4740-battery"); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>"); MODULE_DESCRIPTION("JZ4740 SoC battery driver");