generic-adc-battery.rar_names

/* * 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 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; /* * 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 = (enum power_supply_property *) ((char *)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(&pdev->dev, gab_chan_name[chan]); if (IS_ERR(adc_bat->channel[chan])) { ret = PTR_ERR(adc_bat->channel[chan]); adc_bat->channel[chan] = NULL; } 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 == 0) { ret = -ENODEV; goto second_mem_fail; } /* * Total number of properties is equal to static properties * plus the dyn