Release 4.11 drivers/power/supply/wm97xx_battery.c

/*
 * Battery measurement code for WM97xx
 *
 * 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/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/wm97xx.h>
#include <linux/spinlock.h>
#include <linux/interrupt.h>
#include <linux/gpio.h>
#include <linux/irq.h>
#include <linux/slab.h>


static struct work_struct bat_work;
static DEFINE_MUTEX(work_lock);

static int bat_status = POWER_SUPPLY_STATUS_UNKNOWN;

static enum power_supply_property *prop;



static unsigned long wm97xx_read_bat(struct power_supply *bat_ps)
{
	struct wm97xx_batt_pdata *pdata = power_supply_get_drvdata(bat_ps);

	return wm97xx_read_aux_adc(dev_get_drvdata(bat_ps->dev.parent),
					pdata->batt_aux) * pdata->batt_mult /
					pdata->batt_div;
}

Contributors
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CommitProp
Marek Vašut
39
82.98%
3
50.00%
Robert Jarzmik
4
8.51%
1
16.67%
Alexander Beregalov
3
6.38%
1
16.67%
Krzysztof Kozlowski
1
2.13%
1
16.67%
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47
100.00%
6
100.00%



static unsigned long wm97xx_read_temp(struct power_supply *bat_ps)
{
	struct wm97xx_batt_pdata *pdata = power_supply_get_drvdata(bat_ps);

	return wm97xx_read_aux_adc(dev_get_drvdata(bat_ps->dev.parent),
					pdata->temp_aux) * pdata->temp_mult /
					pdata->temp_div;
}

Contributors
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CommitProp
Marek Vašut
39
82.98%
3
50.00%
Robert Jarzmik
4
8.51%
1
16.67%
Alexander Beregalov
3
6.38%
1
16.67%
Krzysztof Kozlowski
1
2.13%
1
16.67%
Total
47
100.00%
6
100.00%



static int wm97xx_bat_get_property(struct power_supply *bat_ps,
			    enum power_supply_property psp,
			    union power_supply_propval *val)
{
	struct wm97xx_batt_pdata *pdata = power_supply_get_drvdata(bat_ps);

	switch (psp) {
	case POWER_SUPPLY_PROP_STATUS:
		val->intval = bat_status;
		break;
	case POWER_SUPPLY_PROP_TECHNOLOGY:
		val->intval = pdata->batt_tech;
		break;
	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
		if (pdata->batt_aux >= 0)
			val->intval = wm97xx_read_bat(bat_ps);
		else
			return -EINVAL;
		break;
	case POWER_SUPPLY_PROP_TEMP:
		if (pdata->temp_aux >= 0)
			val->intval = wm97xx_read_temp(bat_ps);
		else
			return -EINVAL;
		break;
	case POWER_SUPPLY_PROP_VOLTAGE_MAX:
		if (pdata->max_voltage >= 0)
			val->intval = pdata->max_voltage;
		else
			return -EINVAL;
		break;
	case POWER_SUPPLY_PROP_VOLTAGE_MIN:
		if (pdata->min_voltage >= 0)
			val->intval = pdata->min_voltage;
		else
			return -EINVAL;
		break;
	case POWER_SUPPLY_PROP_PRESENT:
		val->intval = 1;
		break;
	default:
		return -EINVAL;
	}
	return 0;
}

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Marek Vašut
174
97.75%
3
75.00%
Robert Jarzmik
4
2.25%
1
25.00%
Total
178
100.00%
4
100.00%



static void wm97xx_bat_external_power_changed(struct power_supply *bat_ps)
{
	schedule_work(&bat_work);
}

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static void wm97xx_bat_update(struct power_supply *bat_ps)
{
	int old_status = bat_status;
	struct wm97xx_batt_pdata *pdata = power_supply_get_drvdata(bat_ps);

	mutex_lock(&work_lock);

	bat_status = (pdata->charge_gpio >= 0) ?
			(gpio_get_value(pdata->charge_gpio) ?
			POWER_SUPPLY_STATUS_DISCHARGING :
			POWER_SUPPLY_STATUS_CHARGING) :
			POWER_SUPPLY_STATUS_UNKNOWN;

	if (old_status != bat_status) {
		pr_debug("%s: %i -> %i\n", bat_ps->desc->name, old_status,
					bat_status);
		power_supply_changed(bat_ps);
	}

	mutex_unlock(&work_lock);
}

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Marek Vašut
85
93.41%
3
60.00%
Robert Jarzmik
4
4.40%
1
20.00%
Krzysztof Kozlowski
2
2.20%
1
20.00%
Total
91
100.00%
5
100.00%


static struct power_supply *bat_psy;

static struct power_supply_desc bat_psy_desc = {
	.type			= POWER_SUPPLY_TYPE_BATTERY,
	.get_property		= wm97xx_bat_get_property,
	.external_power_changed = wm97xx_bat_external_power_changed,
	.use_for_apm		= 1,
};



static void wm97xx_bat_work(struct work_struct *work)
{
	wm97xx_bat_update(bat_psy);
}

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1
6.25%
1
33.33%
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16
100.00%
3
100.00%



static irqreturn_t wm97xx_chrg_irq(int irq, void *data)
{
	schedule_work(&bat_work);
	return IRQ_HANDLED;
}

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#ifdef CONFIG_PM


static int wm97xx_bat_suspend(struct device *dev)
{
	flush_work(&bat_work);
	return 0;
}

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5
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static int wm97xx_bat_resume(struct device *dev)
{
	schedule_work(&bat_work);
	return 0;
}

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static const struct dev_pm_ops wm97xx_bat_pm_ops = {
	.suspend	= wm97xx_bat_suspend,
	.resume		= wm97xx_bat_resume,
};
#endif



static int wm97xx_bat_probe(struct platform_device *dev)
{
	int ret = 0;
	int props = 1;	/* POWER_SUPPLY_PROP_PRESENT */
	int i = 0;
	struct wm97xx_batt_pdata *pdata = dev->dev.platform_data;
	struct power_supply_config cfg = {};

	if (!pdata) {
		dev_err(&dev->dev, "No platform data supplied\n");
		return -EINVAL;
	}

	cfg.drv_data = pdata;

	if (dev->id != -1)
		return -EINVAL;

	if (gpio_is_valid(pdata->charge_gpio)) {
		ret = gpio_request(pdata->charge_gpio, "BATT CHRG");
		if (ret)
			goto err;
		ret = gpio_direction_input(pdata->charge_gpio);
		if (ret)
			goto err2;
		ret = request_irq(gpio_to_irq(pdata->charge_gpio),
				wm97xx_chrg_irq, 0,
				"AC Detect", dev);
		if (ret)
			goto err2;
		props++;	/* POWER_SUPPLY_PROP_STATUS */
	}

	if (pdata->batt_tech >= 0)
		props++;	/* POWER_SUPPLY_PROP_TECHNOLOGY */
	if (pdata->temp_aux >= 0)
		props++;	/* POWER_SUPPLY_PROP_TEMP */
	if (pdata->batt_aux >= 0)
		props++;	/* POWER_SUPPLY_PROP_VOLTAGE_NOW */
	if (pdata->max_voltage >= 0)
		props++;	/* POWER_SUPPLY_PROP_VOLTAGE_MAX */
	if (pdata->min_voltage >= 0)
		props++;	/* POWER_SUPPLY_PROP_VOLTAGE_MIN */

	prop = kzalloc(props * sizeof(*prop), GFP_KERNEL);
	if (!prop) {
		ret = -ENOMEM;
		goto err3;
	}

	prop[i++] = POWER_SUPPLY_PROP_PRESENT;
	if (pdata->charge_gpio >= 0)
		prop[i++] = POWER_SUPPLY_PROP_STATUS;
	if (pdata->batt_tech >= 0)
		prop[i++] = POWER_SUPPLY_PROP_TECHNOLOGY;
	if (pdata->temp_aux >= 0)
		prop[i++] = POWER_SUPPLY_PROP_TEMP;
	if (pdata->batt_aux >= 0)
		prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_NOW;
	if (pdata->max_voltage >= 0)
		prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_MAX;
	if (pdata->min_voltage >= 0)
		prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_MIN;

	INIT_WORK(&bat_work, wm97xx_bat_work);

	if (!pdata->batt_name) {
		dev_info(&dev->dev, "Please consider setting proper battery "
				"name in platform definition file, falling "
				"back to name \"wm97xx-batt\"\n");
		bat_psy_desc.name = "wm97xx-batt";
	} else
		bat_psy_desc.name = pdata->batt_name;

	bat_psy_desc.properties = prop;
	bat_psy_desc.num_properties = props;

	bat_psy = power_supply_register(&dev->dev, &bat_psy_desc, &cfg);
	if (!IS_ERR(bat_psy)) {
		schedule_work(&bat_work);
	} else {
		ret = PTR_ERR(bat_psy);
		goto err4;
	}

	return 0;
err4:
	kfree(prop);
err3:
	if (gpio_is_valid(pdata->charge_gpio))
		free_irq(gpio_to_irq(pdata->charge_gpio), dev);
err2:
	if (gpio_is_valid(pdata->charge_gpio))
		gpio_free(pdata->charge_gpio);
err:
	return ret;
}

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Marek Vašut
449
87.87%
4
36.36%
Krzysztof Kozlowski
22
4.31%
2
18.18%
Mark Brown
19
3.72%
2
18.18%
Robert Jarzmik
13
2.54%
1
9.09%
Julia Lawall
7
1.37%
1
9.09%
Yong Zhang
1
0.20%
1
9.09%
Total
511
100.00%
11
100.00%



static int wm97xx_bat_remove(struct platform_device *dev)
{
	struct wm97xx_batt_pdata *pdata = dev->dev.platform_data;

	if (pdata && gpio_is_valid(pdata->charge_gpio)) {
		free_irq(gpio_to_irq(pdata->charge_gpio), dev);
		gpio_free(pdata->charge_gpio);
	}
	cancel_work_sync(&bat_work);
	power_supply_unregister(bat_psy);
	kfree(prop);
	return 0;
}

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Tejun Heo
5
6.85%
1
14.29%
Robert Jarzmik
2
2.74%
1
14.29%
Krzysztof Kozlowski
1
1.37%
1
14.29%
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73
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7
100.00%


static struct platform_driver wm97xx_bat_driver = {
	.driver	= {
		.name	= "wm97xx-battery",
#ifdef CONFIG_PM
		.pm	= &wm97xx_bat_pm_ops,
#endif
	},
	.probe		= wm97xx_bat_probe,
	.remove		= wm97xx_bat_remove,
};


module_platform_driver(wm97xx_bat_driver);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
MODULE_DESCRIPTION("WM97xx battery driver");
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Krzysztof Kozlowski
35
2.88%
2
10.00%
Robert Jarzmik
31
2.55%
1
5.00%
Mark Brown
20
1.65%
2
10.00%
Tejun Heo
13
1.07%
3
15.00%
Julia Lawall
7
0.58%
1
5.00%
Alexander Beregalov
6
0.49%
1
5.00%
Axel Lin
6
0.49%
2
10.00%
Yong Zhang
1
0.08%
1
5.00%
Alexey Dobriyan
1
0.08%
1
5.00%
Sebastian Reichel
1
0.08%
1
5.00%
Total
1214
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20
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Directory: drivers/power/supply

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