diff options
| -rw-r--r-- | drivers/power/Kconfig | 7 | ||||
| -rw-r--r-- | drivers/power/Makefile | 1 | ||||
| -rw-r--r-- | drivers/power/generic-adc-battery.c | 422 | ||||
| -rw-r--r-- | include/linux/power/generic-adc-battery.h | 29 |
4 files changed, 459 insertions, 0 deletions
diff --git a/drivers/power/Kconfig b/drivers/power/Kconfig index c1892f321c46..80978196aae8 100644 --- a/drivers/power/Kconfig +++ b/drivers/power/Kconfig @@ -29,6 +29,13 @@ config APM_POWER Say Y here to enable support APM status emulation using battery class devices. +config GENERIC_ADC_BATTERY + tristate "Generic battery support using IIO" + depends on IIO + help + Say Y here to enable support for the generic battery driver + which uses IIO framework to read adc. + config MAX8925_POWER tristate "MAX8925 battery charger support" depends on MFD_MAX8925 diff --git a/drivers/power/Makefile b/drivers/power/Makefile index ee58afb1e71f..e0b4d4284e1d 100644 --- a/drivers/power/Makefile +++ b/drivers/power/Makefile @@ -5,6 +5,7 @@ power_supply-$(CONFIG_SYSFS) += power_supply_sysfs.o power_supply-$(CONFIG_LEDS_TRIGGERS) += power_supply_leds.o obj-$(CONFIG_POWER_SUPPLY) += power_supply.o +obj-$(CONFIG_GENERIC_ADC_BATTERY) += generic-adc-battery.o obj-$(CONFIG_PDA_POWER) += pda_power.o obj-$(CONFIG_APM_POWER) += apm_power.o diff --git a/drivers/power/generic-adc-battery.c b/drivers/power/generic-adc-battery.c new file mode 100644 index 000000000000..9bdf44470396 --- /dev/null +++ b/drivers/power/generic-adc-battery.c @@ -0,0 +1,422 @@ +/* + * Generic battery driver code using IIO + * Copyright (C) 2012, Anish Kumar <anish198519851985@gmail.com> + * based on jz4740-battery.c + * based on s3c_adc_battery.c + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file COPYING in the main directory of this archive for + * more details. + * + */ +#include <linux/interrupt.h> +#include <linux/platform_device.h> +#include <linux/power_supply.h> +#include <linux/gpio.h> +#include <linux/err.h> +#include <linux/timer.h> +#include <linux/jiffies.h> +#include <linux/errno.h> +#include <linux/init.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/iio/consumer.h> +#include <linux/iio/types.h> +#include <linux/power/generic-adc-battery.h> + +#define JITTER_DEFAULT 10 /* hope 10ms is enough */ + +enum gab_chan_type { + GAB_VOLTAGE = 0, + GAB_CURRENT, + GAB_POWER, + GAB_MAX_CHAN_TYPE +}; + +/* + * gab_chan_name suggests the standard channel names for commonly used + * channel types. + */ +static const char *const gab_chan_name[] = { + [GAB_VOLTAGE] = "voltage", + [GAB_CURRENT] = "current", + [GAB_POWER] = "power", +}; + +struct gab { + struct power_supply psy; + struct iio_channel *channel[GAB_MAX_CHAN_TYPE]; + struct gab_platform_data *pdata; + struct delayed_work bat_work; + int level; + int status; + bool cable_plugged; +}; + +static struct gab *to_generic_bat(struct power_supply *psy) +{ + return container_of(psy, struct gab, psy); +} + +static void gab_ext_power_changed(struct power_supply *psy) +{ + struct gab *adc_bat = to_generic_bat(psy); + + schedule_delayed_work(&adc_bat->bat_work, msecs_to_jiffies(0)); +} + +static const enum power_supply_property gab_props[] = { + POWER_SUPPLY_PROP_STATUS, + POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, + POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN, + POWER_SUPPLY_PROP_CHARGE_NOW, + POWER_SUPPLY_PROP_VOLTAGE_NOW, + POWER_SUPPLY_PROP_CURRENT_NOW, + POWER_SUPPLY_PROP_TECHNOLOGY, + POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, + POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN, + POWER_SUPPLY_PROP_MODEL_NAME, +}; + +/* + * This properties are set based on the received platform data and this + * should correspond one-to-one with enum chan_type. + */ +static const enum power_supply_property gab_dyn_props[] = { + POWER_SUPPLY_PROP_VOLTAGE_NOW, + POWER_SUPPLY_PROP_CURRENT_NOW, + POWER_SUPPLY_PROP_POWER_NOW, +}; + +static bool gab_charge_finished(struct gab *adc_bat) +{ + struct gab_platform_data *pdata = adc_bat->pdata; + bool ret = gpio_get_value(pdata->gpio_charge_finished); + bool inv = pdata->gpio_inverted; + + if (!gpio_is_valid(pdata->gpio_charge_finished)) + return false; + return ret ^ inv; +} + +static int gab_get_status(struct gab *adc_bat) +{ + struct gab_platform_data *pdata = adc_bat->pdata; + struct power_supply_info *bat_info; + + bat_info = &pdata->battery_info; + if (adc_bat->level == bat_info->charge_full_design) + return POWER_SUPPLY_STATUS_FULL; + return adc_bat->status; +} + +static enum gab_chan_type gab_prop_to_chan(enum power_supply_property psp) +{ + switch (psp) { + case POWER_SUPPLY_PROP_POWER_NOW: + return GAB_POWER; + case POWER_SUPPLY_PROP_VOLTAGE_NOW: + return GAB_VOLTAGE; + case POWER_SUPPLY_PROP_CURRENT_NOW: + return GAB_CURRENT; + default: + WARN_ON(1); + break; + } + return GAB_POWER; +} + +static int read_channel(struct gab *adc_bat, enum power_supply_property psp, + int *result) +{ + int ret; + int chan_index; + + chan_index = gab_prop_to_chan(psp); + ret = iio_read_channel_processed(adc_bat->channel[chan_index], + result); + if (ret < 0) + pr_err("read channel error\n"); + return ret; +} + +static int gab_get_property(struct power_supply *psy, + enum power_supply_property psp, union power_supply_propval *val) +{ + struct gab *adc_bat; + struct gab_platform_data *pdata; + struct power_supply_info *bat_info; + int result = 0; + int ret = 0; + + adc_bat = to_generic_bat(psy); + if (!adc_bat) { + dev_err(psy->dev, "no battery infos ?!\n"); + return -EINVAL; + } + pdata = adc_bat->pdata; + bat_info = &pdata->battery_info; + + switch (psp) { + case POWER_SUPPLY_PROP_STATUS: + gab_get_status(adc_bat); + break; + case POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN: + val->intval = 0; + break; + case POWER_SUPPLY_PROP_CHARGE_NOW: + val->intval = pdata->cal_charge(result); + break; + case POWER_SUPPLY_PROP_VOLTAGE_NOW: + case POWER_SUPPLY_PROP_CURRENT_NOW: + case POWER_SUPPLY_PROP_POWER_NOW: + ret = read_channel(adc_bat, psp, &result); + if (ret < 0) + goto err; + val->intval = result; + break; + case POWER_SUPPLY_PROP_TECHNOLOGY: + val->intval = bat_info->technology; + break; + case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN: + val->intval = bat_info->voltage_min_design; + break; + case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN: + val->intval = bat_info->voltage_max_design; + break; + case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN: + val->intval = bat_info->charge_full_design; + break; + case POWER_SUPPLY_PROP_MODEL_NAME: + val->strval = bat_info->name; + break; + default: + return -EINVAL; + } +err: + return ret; +} + +static void gab_work(struct work_struct *work) +{ + struct gab *adc_bat; + struct gab_platform_data *pdata; + struct delayed_work *delayed_work; + bool is_plugged; + int status; + + delayed_work = container_of(work, struct delayed_work, work); + adc_bat = container_of(delayed_work, struct gab, bat_work); + pdata = adc_bat->pdata; + status = adc_bat->status; + + is_plugged = power_supply_am_i_supplied(&adc_bat->psy); + adc_bat->cable_plugged = is_plugged; + + if (!is_plugged) + adc_bat->status = POWER_SUPPLY_STATUS_DISCHARGING; + else if (gab_charge_finished(adc_bat)) + adc_bat->status = POWER_SUPPLY_STATUS_NOT_CHARGING; + else + adc_bat->status = POWER_SUPPLY_STATUS_CHARGING; + + if (status != adc_bat->status) + power_supply_changed(&adc_bat->psy); +} + +static irqreturn_t gab_charged(int irq, void *dev_id) +{ + struct gab *adc_bat = dev_id; + struct gab_platform_data *pdata = adc_bat->pdata; + int delay; + + delay = pdata->jitter_delay ? pdata->jitter_delay : JITTER_DEFAULT; + schedule_delayed_work(&adc_bat->bat_work, + msecs_to_jiffies(delay)); + return IRQ_HANDLED; +} + +static int __devinit gab_probe(struct platform_device *pdev) +{ + struct gab *adc_bat; + struct power_supply *psy; + struct gab_platform_data *pdata = pdev->dev.platform_data; + enum power_supply_property *properties; + int ret = 0; + int chan; + int index = 0; + + adc_bat = devm_kzalloc(&pdev->dev, sizeof(*adc_bat), GFP_KERNEL); + if (!adc_bat) { + dev_err(&pdev->dev, "failed to allocate memory\n"); + return -ENOMEM; + } + + psy = &adc_bat->psy; + psy->name = pdata->battery_info.name; + + /* bootup default values for the battery */ + adc_bat->cable_plugged = false; + adc_bat->status = POWER_SUPPLY_STATUS_DISCHARGING; + psy->type = POWER_SUPPLY_TYPE_BATTERY; + psy->get_property = gab_get_property; + psy->external_power_changed = gab_ext_power_changed; + adc_bat->pdata = pdata; + + /* calculate the total number of channels */ + chan = ARRAY_SIZE(gab_chan_name); + + /* + * copying the static properties and allocating extra memory for holding + * the extra configurable properties received from platform data. + */ + psy->properties = kcalloc(ARRAY_SIZE(gab_props) + + ARRAY_SIZE(gab_chan_name), + sizeof(*psy->properties), GFP_KERNEL); + if (!psy->properties) { + ret = -ENOMEM; + goto first_mem_fail; + } + + memcpy(psy->properties, gab_props, sizeof(gab_props)); + properties = psy->properties + sizeof(gab_props); + + /* + * getting channel from iio and copying the battery properties + * based on the channel supported by consumer device. + */ + for (chan = 0; chan < ARRAY_SIZE(gab_chan_name); chan++) { + adc_bat->channel[chan] = iio_channel_get(dev_name(&pdev->dev), + gab_chan_name[chan]); + if (IS_ERR(adc_bat->channel[chan])) { + ret = PTR_ERR(adc_bat->channel[chan]); + } else { + /* copying properties for supported channels only */ + memcpy(properties + sizeof(*(psy->properties)) * index, + &gab_dyn_props[chan], + sizeof(gab_dyn_props[chan])); + index++; + } + } + + /* none of the channels are supported so let's bail out */ + if (index == ARRAY_SIZE(gab_chan_name)) + goto second_mem_fail; + + /* + * Total number of properties is equal to static properties + * plus the dynamic properties.Some properties may not be set + * as come channels may be not be supported by the device.So + * we need to take care of that. + */ + psy->num_properties = ARRAY_SIZE(gab_props) + index; + + ret = power_supply_register(&pdev->dev, psy); + if (ret) + goto err_reg_fail; + + INIT_DELAYED_WORK(&adc_bat->bat_work, gab_work); + + if (gpio_is_valid(pdata->gpio_charge_finished)) { + int irq; + ret = gpio_request(pdata->gpio_charge_finished, "charged"); + if (ret) + goto gpio_req_fail; + + irq = gpio_to_irq(pdata->gpio_charge_finished); + ret = request_any_context_irq(irq, gab_charged, + IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING, + "battery charged", adc_bat); + if (ret) + goto err_gpio; + } + + platform_set_drvdata(pdev, adc_bat); + + /* Schedule timer to check current status */ + schedule_delayed_work(&adc_bat->bat_work, + msecs_to_jiffies(0)); + return 0; + +err_gpio: + gpio_free(pdata->gpio_charge_finished); +gpio_req_fail: + power_supply_unregister(psy); +err_reg_fail: + for (chan = 0; ARRAY_SIZE(gab_chan_name); chan++) + iio_channel_release(adc_bat->channel[chan]); +second_mem_fail: + kfree(psy->properties); +first_mem_fail: + return ret; +} + +static int __devexit gab_remove(struct platform_device *pdev) +{ + int chan; + struct gab *adc_bat = platform_get_drvdata(pdev); + struct gab_platform_data *pdata = adc_bat->pdata; + + power_supply_unregister(&adc_bat->psy); + + if (gpio_is_valid(pdata->gpio_charge_finished)) { + free_irq(gpio_to_irq(pdata->gpio_charge_finished), adc_bat); + gpio_free(pdata->gpio_charge_finished); + } + + for (chan = 0; ARRAY_SIZE(gab_chan_name); chan++) + iio_channel_release(adc_bat->channel[chan]); + + kfree(adc_bat->psy.properties); + cancel_delayed_work(&adc_bat->bat_work); + return 0; +} + +#ifdef CONFIG_PM +static int gab_suspend(struct device *dev) +{ + struct gab *adc_bat = dev_get_drvdata(dev); + + cancel_delayed_work_sync(&adc_bat->bat_work); + adc_bat->status = POWER_SUPPLY_STATUS_UNKNOWN; + return 0; +} + +static int gab_resume(struct device *dev) +{ + struct gab *adc_bat = dev_get_drvdata(dev); + struct gab_platform_data *pdata = adc_bat->pdata; + int delay; + + delay = pdata->jitter_delay ? pdata->jitter_delay : JITTER_DEFAULT; + + /* Schedule timer to check current status */ + schedule_delayed_work(&adc_bat->bat_work, + msecs_to_jiffies(delay)); + return 0; +} + +static const struct dev_pm_ops gab_pm_ops = { + .suspend = gab_suspend, + .resume = gab_resume, +}; + +#define GAB_PM_OPS (&gab_pm_ops) +#else +#define GAB_PM_OPS (NULL) +#endif + +static struct platform_driver gab_driver = { + .driver = { + .name = "generic-adc-battery", + .owner = THIS_MODULE, + .pm = GAB_PM_OPS + }, + .probe = gab_probe, + .remove = __devexit_p(gab_remove), +}; +module_platform_driver(gab_driver); + +MODULE_AUTHOR("anish kumar <anish198519851985@gmail.com>"); +MODULE_DESCRIPTION("generic battery driver using IIO"); +MODULE_LICENSE("GPL"); diff --git a/include/linux/power/generic-adc-battery.h b/include/linux/power/generic-adc-battery.h new file mode 100644 index 000000000000..b1ebe08533b6 --- /dev/null +++ b/include/linux/power/generic-adc-battery.h @@ -0,0 +1,29 @@ +/* + * Copyright (C) 2012, Anish Kumar <anish198519851985@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. + */ + +#ifndef GENERIC_ADC_BATTERY_H +#define GENERIC_ADC_BATTERY_H + +/** + * struct gab_platform_data - platform_data for generic adc iio battery driver. + * @battery_info: recommended structure to specify static power supply + * parameters + * @cal_charge: calculate charge level. + * @gpio_charge_finished: gpio for the charger. + * @gpio_inverted: Should be 1 if the GPIO is active low otherwise 0 + * @jitter_delay: delay required after the interrupt to check battery + * status.Default set is 10ms. + */ +struct gab_platform_data { + struct power_supply_info battery_info; + int (*cal_charge)(long value); + int gpio_charge_finished; + bool gpio_inverted; + int jitter_delay; +}; + +#endif /* GENERIC_ADC_BATTERY_H */ |
