From: anish kumar <anish198519851985@xxxxxxxxx>
In last version:
Addressed concerns raised by lars:
a. made the adc_bat per device.
b. get the IIO channel using hardcoded channel names.
c. Minor issues related to gpio_is_valid and some code
refactoring.
In V1:
Addressed concerns raised by Anton:
a. changed the struct name to gab(generic adc battery).
b. Added some functions to neaten the code.
c. Some minor coding guidelines changes.
d. Used the latest function introduce by lars:
iio_read_channel_processed to streamline the code.
In V2:
Addressed concerns by lars:
a. No need of allocating memory for channels.Make it array.
b. Code restructring, coding style and following kernel guidelines changes
suggested by him.
Signed-off-by: anish kumar <anish198519851985@xxxxxxxxx>
---
drivers/power/generic-adc-battery.c | 429 +++++++++++++++++++++++++++++
include/linux/power/generic-adc-battery.h | 28 ++
2 files changed, 457 insertions(+), 0 deletions(-)
create mode 100644 drivers/power/generic-adc-battery.c
create mode 100644 include/linux/power/generic-adc-battery.h
diff --git a/drivers/power/generic-adc-battery.c b/drivers/power/generic-adc-battery.c
new file mode 100644
index 0000000..746a210
--- /dev/null
+++ b/drivers/power/generic-adc-battery.c
@@ -0,0 +1,429 @@
+/*
+ * Generic battery driver code using IIO
+ * Copyright (C) 2012, Anish Kumar <anish198519851985@xxxxxxxxx>
+ * 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 {
+ VOLTAGE = 0,
+ CURRENT,
+ POWER,
+ MAX_CHAN_TYPE
+};
+
+/*
+ * gab_chan_name suggests the standard channel names for commonly used
+ * channel types.
+ */
+static const char *const gab_chan_name[] = {
+ [VOLTAGE] = "voltage",
+ [CURRENT] = "current",
+ [POWER] = "power",
+};
+
+struct gab {
+ struct power_supply psy;
+ struct iio_channel *channel[MAX_CHAN_TYPE];
+ struct gab_platform_data *pdata;
+ struct delayed_work bat_work;
+ int level;
+ int status;
+ int cable_plugged:1;
+};
+
+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;
+ 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;
+ else
+ return adc_bat->status;
+}
+
+enum gab_chan_type gab_prop_to_chan(enum power_supply_property psp)
+{
+ switch (psp) {
+ case POWER_SUPPLY_PROP_POWER_NOW:
+ return POWER;
+ case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+ return VOLTAGE;
+ case POWER_SUPPLY_PROP_CURRENT_NOW:
+ return CURRENT;
+ default:
+ WARN_ON(1);
+ break;
+ }
+ return POWER;
+}
+
+static int read_channel(struct gab *adc_bat, enum power_supply_property psp,
+ int *result)
+{
+ int ret = 0;
+ 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;
+ int 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;
+ int delay;
+
+ pdata = adc_bat->pdata;
+ 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 = 0;
+ 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_platform_data *pdata;
+ struct gab *adc_bat = platform_get_drvdata(pdev);
+
+ 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;
+ int delay;
+
+ pdata = adc_bat->pdata;
+ 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@xxxxxxxxx>");
+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 0000000..aa9ea14
--- /dev/null
+++ b/include/linux/power/generic-adc-battery.h
@@ -0,0 +1,28 @@
+/*
+ * 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 */
--
1.7.1
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