cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

wm97xx_battery.c (6711B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * Battery measurement code for WM97xx
      4 *
      5 * based on tosa_battery.c
      6 *
      7 * Copyright (C) 2008 Marek Vasut <marek.vasut@gmail.com>
      8 */
      9
     10#include <linux/init.h>
     11#include <linux/kernel.h>
     12#include <linux/module.h>
     13#include <linux/platform_device.h>
     14#include <linux/power_supply.h>
     15#include <linux/wm97xx.h>
     16#include <linux/spinlock.h>
     17#include <linux/interrupt.h>
     18#include <linux/gpio/consumer.h>
     19#include <linux/irq.h>
     20#include <linux/slab.h>
     21
     22static struct work_struct bat_work;
     23static struct gpio_desc *charge_gpiod;
     24static DEFINE_MUTEX(work_lock);
     25static int bat_status = POWER_SUPPLY_STATUS_UNKNOWN;
     26static enum power_supply_property *prop;
     27
     28static unsigned long wm97xx_read_bat(struct power_supply *bat_ps)
     29{
     30	struct wm97xx_batt_pdata *pdata = power_supply_get_drvdata(bat_ps);
     31
     32	return wm97xx_read_aux_adc(dev_get_drvdata(bat_ps->dev.parent),
     33					pdata->batt_aux) * pdata->batt_mult /
     34					pdata->batt_div;
     35}
     36
     37static unsigned long wm97xx_read_temp(struct power_supply *bat_ps)
     38{
     39	struct wm97xx_batt_pdata *pdata = power_supply_get_drvdata(bat_ps);
     40
     41	return wm97xx_read_aux_adc(dev_get_drvdata(bat_ps->dev.parent),
     42					pdata->temp_aux) * pdata->temp_mult /
     43					pdata->temp_div;
     44}
     45
     46static int wm97xx_bat_get_property(struct power_supply *bat_ps,
     47			    enum power_supply_property psp,
     48			    union power_supply_propval *val)
     49{
     50	struct wm97xx_batt_pdata *pdata = power_supply_get_drvdata(bat_ps);
     51
     52	switch (psp) {
     53	case POWER_SUPPLY_PROP_STATUS:
     54		val->intval = bat_status;
     55		break;
     56	case POWER_SUPPLY_PROP_TECHNOLOGY:
     57		val->intval = pdata->batt_tech;
     58		break;
     59	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
     60		if (pdata->batt_aux >= 0)
     61			val->intval = wm97xx_read_bat(bat_ps);
     62		else
     63			return -EINVAL;
     64		break;
     65	case POWER_SUPPLY_PROP_TEMP:
     66		if (pdata->temp_aux >= 0)
     67			val->intval = wm97xx_read_temp(bat_ps);
     68		else
     69			return -EINVAL;
     70		break;
     71	case POWER_SUPPLY_PROP_VOLTAGE_MAX:
     72		if (pdata->max_voltage >= 0)
     73			val->intval = pdata->max_voltage;
     74		else
     75			return -EINVAL;
     76		break;
     77	case POWER_SUPPLY_PROP_VOLTAGE_MIN:
     78		if (pdata->min_voltage >= 0)
     79			val->intval = pdata->min_voltage;
     80		else
     81			return -EINVAL;
     82		break;
     83	case POWER_SUPPLY_PROP_PRESENT:
     84		val->intval = 1;
     85		break;
     86	default:
     87		return -EINVAL;
     88	}
     89	return 0;
     90}
     91
     92static void wm97xx_bat_external_power_changed(struct power_supply *bat_ps)
     93{
     94	schedule_work(&bat_work);
     95}
     96
     97static void wm97xx_bat_update(struct power_supply *bat_ps)
     98{
     99	int old_status = bat_status;
    100
    101	mutex_lock(&work_lock);
    102
    103	bat_status = (charge_gpiod) ?
    104			(gpiod_get_value(charge_gpiod) ?
    105			POWER_SUPPLY_STATUS_DISCHARGING :
    106			POWER_SUPPLY_STATUS_CHARGING) :
    107			POWER_SUPPLY_STATUS_UNKNOWN;
    108
    109	if (old_status != bat_status) {
    110		pr_debug("%s: %i -> %i\n", bat_ps->desc->name, old_status,
    111					bat_status);
    112		power_supply_changed(bat_ps);
    113	}
    114
    115	mutex_unlock(&work_lock);
    116}
    117
    118static struct power_supply *bat_psy;
    119static struct power_supply_desc bat_psy_desc = {
    120	.type			= POWER_SUPPLY_TYPE_BATTERY,
    121	.get_property		= wm97xx_bat_get_property,
    122	.external_power_changed = wm97xx_bat_external_power_changed,
    123	.use_for_apm		= 1,
    124};
    125
    126static void wm97xx_bat_work(struct work_struct *work)
    127{
    128	wm97xx_bat_update(bat_psy);
    129}
    130
    131static irqreturn_t wm97xx_chrg_irq(int irq, void *data)
    132{
    133	schedule_work(&bat_work);
    134	return IRQ_HANDLED;
    135}
    136
    137#ifdef CONFIG_PM
    138static int wm97xx_bat_suspend(struct device *dev)
    139{
    140	flush_work(&bat_work);
    141	return 0;
    142}
    143
    144static int wm97xx_bat_resume(struct device *dev)
    145{
    146	schedule_work(&bat_work);
    147	return 0;
    148}
    149
    150static const struct dev_pm_ops wm97xx_bat_pm_ops = {
    151	.suspend	= wm97xx_bat_suspend,
    152	.resume		= wm97xx_bat_resume,
    153};
    154#endif
    155
    156static int wm97xx_bat_probe(struct platform_device *dev)
    157{
    158	int ret = 0;
    159	int props = 1;	/* POWER_SUPPLY_PROP_PRESENT */
    160	int i = 0;
    161	struct wm97xx_batt_pdata *pdata = dev->dev.platform_data;
    162	struct power_supply_config cfg = {};
    163
    164	if (!pdata) {
    165		dev_err(&dev->dev, "No platform data supplied\n");
    166		return -EINVAL;
    167	}
    168
    169	cfg.drv_data = pdata;
    170
    171	if (dev->id != -1)
    172		return -EINVAL;
    173
    174	charge_gpiod = devm_gpiod_get_optional(&dev->dev, NULL, GPIOD_IN);
    175	if (IS_ERR(charge_gpiod))
    176		return dev_err_probe(&dev->dev,
    177				     PTR_ERR(charge_gpiod),
    178				     "failed to get charge GPIO\n");
    179	if (charge_gpiod) {
    180		gpiod_set_consumer_name(charge_gpiod, "BATT CHRG");
    181		ret = request_irq(gpiod_to_irq(charge_gpiod),
    182				wm97xx_chrg_irq, 0,
    183				"AC Detect", dev);
    184		if (ret)
    185			return dev_err_probe(&dev->dev, ret,
    186					     "failed to request GPIO irq\n");
    187		props++;	/* POWER_SUPPLY_PROP_STATUS */
    188	}
    189
    190	if (pdata->batt_tech >= 0)
    191		props++;	/* POWER_SUPPLY_PROP_TECHNOLOGY */
    192	if (pdata->temp_aux >= 0)
    193		props++;	/* POWER_SUPPLY_PROP_TEMP */
    194	if (pdata->batt_aux >= 0)
    195		props++;	/* POWER_SUPPLY_PROP_VOLTAGE_NOW */
    196	if (pdata->max_voltage >= 0)
    197		props++;	/* POWER_SUPPLY_PROP_VOLTAGE_MAX */
    198	if (pdata->min_voltage >= 0)
    199		props++;	/* POWER_SUPPLY_PROP_VOLTAGE_MIN */
    200
    201	prop = kcalloc(props, sizeof(*prop), GFP_KERNEL);
    202	if (!prop) {
    203		ret = -ENOMEM;
    204		goto err3;
    205	}
    206
    207	prop[i++] = POWER_SUPPLY_PROP_PRESENT;
    208	if (charge_gpiod)
    209		prop[i++] = POWER_SUPPLY_PROP_STATUS;
    210	if (pdata->batt_tech >= 0)
    211		prop[i++] = POWER_SUPPLY_PROP_TECHNOLOGY;
    212	if (pdata->temp_aux >= 0)
    213		prop[i++] = POWER_SUPPLY_PROP_TEMP;
    214	if (pdata->batt_aux >= 0)
    215		prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_NOW;
    216	if (pdata->max_voltage >= 0)
    217		prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_MAX;
    218	if (pdata->min_voltage >= 0)
    219		prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_MIN;
    220
    221	INIT_WORK(&bat_work, wm97xx_bat_work);
    222
    223	if (!pdata->batt_name) {
    224		dev_info(&dev->dev, "Please consider setting proper battery "
    225				"name in platform definition file, falling "
    226				"back to name \"wm97xx-batt\"\n");
    227		bat_psy_desc.name = "wm97xx-batt";
    228	} else
    229		bat_psy_desc.name = pdata->batt_name;
    230
    231	bat_psy_desc.properties = prop;
    232	bat_psy_desc.num_properties = props;
    233
    234	bat_psy = power_supply_register(&dev->dev, &bat_psy_desc, &cfg);
    235	if (!IS_ERR(bat_psy)) {
    236		schedule_work(&bat_work);
    237	} else {
    238		ret = PTR_ERR(bat_psy);
    239		goto err4;
    240	}
    241
    242	return 0;
    243err4:
    244	kfree(prop);
    245err3:
    246	if (charge_gpiod)
    247		free_irq(gpiod_to_irq(charge_gpiod), dev);
    248	return ret;
    249}
    250
    251static int wm97xx_bat_remove(struct platform_device *dev)
    252{
    253	if (charge_gpiod)
    254		free_irq(gpiod_to_irq(charge_gpiod), dev);
    255	cancel_work_sync(&bat_work);
    256	power_supply_unregister(bat_psy);
    257	kfree(prop);
    258	return 0;
    259}
    260
    261static struct platform_driver wm97xx_bat_driver = {
    262	.driver	= {
    263		.name	= "wm97xx-battery",
    264#ifdef CONFIG_PM
    265		.pm	= &wm97xx_bat_pm_ops,
    266#endif
    267	},
    268	.probe		= wm97xx_bat_probe,
    269	.remove		= wm97xx_bat_remove,
    270};
    271
    272module_platform_driver(wm97xx_bat_driver);
    273
    274MODULE_LICENSE("GPL");
    275MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
    276MODULE_DESCRIPTION("WM97xx battery driver");