| /* |
| * 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; |
| |
| 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"); |