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alistair23-linux/drivers/power/supply/axp20x_usb_power.c
Thomas Gleixner 2874c5fd28 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 
Based on 1 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license as published by
  the free software foundation either version 2 of the license or at
  your option any later version

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 3029 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:32 -07:00

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* AXP20x PMIC USB power supply status driver
*
* Copyright (C) 2015 Hans de Goede <hdegoede@redhat.com>
* Copyright (C) 2014 Bruno Prémont <bonbons@linux-vserver.org>
*/
#include <linux/bitops.h>
#include <linux/device.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/mfd/axp20x.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#include <linux/iio/consumer.h>
#include <linux/workqueue.h>
#define DRVNAME "axp20x-usb-power-supply"
#define AXP20X_PWR_STATUS_VBUS_PRESENT BIT(5)
#define AXP20X_PWR_STATUS_VBUS_USED BIT(4)
#define AXP20X_USB_STATUS_VBUS_VALID BIT(2)
#define AXP20X_VBUS_VHOLD_uV(b) (4000000 + (((b) >> 3) & 7) * 100000)
#define AXP20X_VBUS_VHOLD_MASK GENMASK(5, 3)
#define AXP20X_VBUS_VHOLD_OFFSET 3
#define AXP20X_VBUS_CLIMIT_MASK 3
#define AXP20X_VBUS_CLIMIT_900mA 0
#define AXP20X_VBUS_CLIMIT_500mA 1
#define AXP20X_VBUS_CLIMIT_100mA 2
#define AXP20X_VBUS_CLIMIT_NONE 3
#define AXP813_VBUS_CLIMIT_900mA 0
#define AXP813_VBUS_CLIMIT_1500mA 1
#define AXP813_VBUS_CLIMIT_2000mA 2
#define AXP813_VBUS_CLIMIT_2500mA 3
#define AXP20X_ADC_EN1_VBUS_CURR BIT(2)
#define AXP20X_ADC_EN1_VBUS_VOLT BIT(3)
#define AXP20X_VBUS_MON_VBUS_VALID BIT(3)
/*
* Note do not raise the debounce time, we must report Vusb high within
* 100ms otherwise we get Vbus errors in musb.
*/
#define DEBOUNCE_TIME msecs_to_jiffies(50)
struct axp20x_usb_power {
struct device_node *np;
struct regmap *regmap;
struct power_supply *supply;
enum axp20x_variants axp20x_id;
struct iio_channel *vbus_v;
struct iio_channel *vbus_i;
struct delayed_work vbus_detect;
unsigned int old_status;
};
static irqreturn_t axp20x_usb_power_irq(int irq, void *devid)
{
struct axp20x_usb_power *power = devid;
power_supply_changed(power->supply);
return IRQ_HANDLED;
}
static void axp20x_usb_power_poll_vbus(struct work_struct *work)
{
struct axp20x_usb_power *power =
container_of(work, struct axp20x_usb_power, vbus_detect.work);
unsigned int val;
int ret;
ret = regmap_read(power->regmap, AXP20X_PWR_INPUT_STATUS, &val);
if (ret)
goto out;
val &= (AXP20X_PWR_STATUS_VBUS_PRESENT | AXP20X_PWR_STATUS_VBUS_USED);
if (val != power->old_status)
power_supply_changed(power->supply);
power->old_status = val;
out:
mod_delayed_work(system_wq, &power->vbus_detect, DEBOUNCE_TIME);
}
static bool axp20x_usb_vbus_needs_polling(struct axp20x_usb_power *power)
{
if (power->axp20x_id >= AXP221_ID)
return true;
return false;
}
static int axp20x_get_current_max(struct axp20x_usb_power *power, int *val)
{
unsigned int v;
int ret = regmap_read(power->regmap, AXP20X_VBUS_IPSOUT_MGMT, &v);
if (ret)
return ret;
switch (v & AXP20X_VBUS_CLIMIT_MASK) {
case AXP20X_VBUS_CLIMIT_100mA:
if (power->axp20x_id == AXP221_ID)
*val = -1; /* No 100mA limit */
else
*val = 100000;
break;
case AXP20X_VBUS_CLIMIT_500mA:
*val = 500000;
break;
case AXP20X_VBUS_CLIMIT_900mA:
*val = 900000;
break;
case AXP20X_VBUS_CLIMIT_NONE:
*val = -1;
break;
}
return 0;
}
static int axp813_get_current_max(struct axp20x_usb_power *power, int *val)
{
unsigned int v;
int ret = regmap_read(power->regmap, AXP20X_VBUS_IPSOUT_MGMT, &v);
if (ret)
return ret;
switch (v & AXP20X_VBUS_CLIMIT_MASK) {
case AXP813_VBUS_CLIMIT_900mA:
*val = 900000;
break;
case AXP813_VBUS_CLIMIT_1500mA:
*val = 1500000;
break;
case AXP813_VBUS_CLIMIT_2000mA:
*val = 2000000;
break;
case AXP813_VBUS_CLIMIT_2500mA:
*val = 2500000;
break;
}
return 0;
}
static int axp20x_usb_power_get_property(struct power_supply *psy,
enum power_supply_property psp, union power_supply_propval *val)
{
struct axp20x_usb_power *power = power_supply_get_drvdata(psy);
unsigned int input, v;
int ret;
switch (psp) {
case POWER_SUPPLY_PROP_VOLTAGE_MIN:
ret = regmap_read(power->regmap, AXP20X_VBUS_IPSOUT_MGMT, &v);
if (ret)
return ret;
val->intval = AXP20X_VBUS_VHOLD_uV(v);
return 0;
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
if (IS_ENABLED(CONFIG_AXP20X_ADC)) {
ret = iio_read_channel_processed(power->vbus_v,
&val->intval);
if (ret)
return ret;
/*
* IIO framework gives mV but Power Supply framework
* gives uV.
*/
val->intval *= 1000;
return 0;
}
ret = axp20x_read_variable_width(power->regmap,
AXP20X_VBUS_V_ADC_H, 12);
if (ret < 0)
return ret;
val->intval = ret * 1700; /* 1 step = 1.7 mV */
return 0;
case POWER_SUPPLY_PROP_CURRENT_MAX:
if (power->axp20x_id == AXP813_ID)
return axp813_get_current_max(power, &val->intval);
return axp20x_get_current_max(power, &val->intval);
case POWER_SUPPLY_PROP_CURRENT_NOW:
if (IS_ENABLED(CONFIG_AXP20X_ADC)) {
ret = iio_read_channel_processed(power->vbus_i,
&val->intval);
if (ret)
return ret;
/*
* IIO framework gives mA but Power Supply framework
* gives uA.
*/
val->intval *= 1000;
return 0;
}
ret = axp20x_read_variable_width(power->regmap,
AXP20X_VBUS_I_ADC_H, 12);
if (ret < 0)
return ret;
val->intval = ret * 375; /* 1 step = 0.375 mA */
return 0;
default:
break;
}
/* All the properties below need the input-status reg value */
ret = regmap_read(power->regmap, AXP20X_PWR_INPUT_STATUS, &input);
if (ret)
return ret;
switch (psp) {
case POWER_SUPPLY_PROP_HEALTH:
if (!(input & AXP20X_PWR_STATUS_VBUS_PRESENT)) {
val->intval = POWER_SUPPLY_HEALTH_UNKNOWN;
break;
}
val->intval = POWER_SUPPLY_HEALTH_GOOD;
if (power->axp20x_id == AXP202_ID) {
ret = regmap_read(power->regmap,
AXP20X_USB_OTG_STATUS, &v);
if (ret)
return ret;
if (!(v & AXP20X_USB_STATUS_VBUS_VALID))
val->intval =
POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
}
break;
case POWER_SUPPLY_PROP_PRESENT:
val->intval = !!(input & AXP20X_PWR_STATUS_VBUS_PRESENT);
break;
case POWER_SUPPLY_PROP_ONLINE:
val->intval = !!(input & AXP20X_PWR_STATUS_VBUS_USED);
break;
default:
return -EINVAL;
}
return 0;
}
static int axp20x_usb_power_set_voltage_min(struct axp20x_usb_power *power,
int intval)
{
int val;
switch (intval) {
case 4000000:
case 4100000:
case 4200000:
case 4300000:
case 4400000:
case 4500000:
case 4600000:
case 4700000:
val = (intval - 4000000) / 100000;
return regmap_update_bits(power->regmap,
AXP20X_VBUS_IPSOUT_MGMT,
AXP20X_VBUS_VHOLD_MASK,
val << AXP20X_VBUS_VHOLD_OFFSET);
default:
return -EINVAL;
}
return -EINVAL;
}
static int axp813_usb_power_set_current_max(struct axp20x_usb_power *power,
int intval)
{
int val;
switch (intval) {
case 900000:
return regmap_update_bits(power->regmap,
AXP20X_VBUS_IPSOUT_MGMT,
AXP20X_VBUS_CLIMIT_MASK,
AXP813_VBUS_CLIMIT_900mA);
case 1500000:
case 2000000:
case 2500000:
val = (intval - 1000000) / 500000;
return regmap_update_bits(power->regmap,
AXP20X_VBUS_IPSOUT_MGMT,
AXP20X_VBUS_CLIMIT_MASK, val);
default:
return -EINVAL;
}
return -EINVAL;
}
static int axp20x_usb_power_set_current_max(struct axp20x_usb_power *power,
int intval)
{
int val;
switch (intval) {
case 100000:
if (power->axp20x_id == AXP221_ID)
return -EINVAL;
/* fall through */
case 500000:
case 900000:
val = (900000 - intval) / 400000;
return regmap_update_bits(power->regmap,
AXP20X_VBUS_IPSOUT_MGMT,
AXP20X_VBUS_CLIMIT_MASK, val);
default:
return -EINVAL;
}
return -EINVAL;
}
static int axp20x_usb_power_set_property(struct power_supply *psy,
enum power_supply_property psp,
const union power_supply_propval *val)
{
struct axp20x_usb_power *power = power_supply_get_drvdata(psy);
switch (psp) {
case POWER_SUPPLY_PROP_VOLTAGE_MIN:
return axp20x_usb_power_set_voltage_min(power, val->intval);
case POWER_SUPPLY_PROP_CURRENT_MAX:
if (power->axp20x_id == AXP813_ID)
return axp813_usb_power_set_current_max(power,
val->intval);
return axp20x_usb_power_set_current_max(power, val->intval);
default:
return -EINVAL;
}
return -EINVAL;
}
static int axp20x_usb_power_prop_writeable(struct power_supply *psy,
enum power_supply_property psp)
{
return psp == POWER_SUPPLY_PROP_VOLTAGE_MIN ||
psp == POWER_SUPPLY_PROP_CURRENT_MAX;
}
static enum power_supply_property axp20x_usb_power_properties[] = {
POWER_SUPPLY_PROP_HEALTH,
POWER_SUPPLY_PROP_PRESENT,
POWER_SUPPLY_PROP_ONLINE,
POWER_SUPPLY_PROP_VOLTAGE_MIN,
POWER_SUPPLY_PROP_VOLTAGE_NOW,
POWER_SUPPLY_PROP_CURRENT_MAX,
POWER_SUPPLY_PROP_CURRENT_NOW,
};
static enum power_supply_property axp22x_usb_power_properties[] = {
POWER_SUPPLY_PROP_HEALTH,
POWER_SUPPLY_PROP_PRESENT,
POWER_SUPPLY_PROP_ONLINE,
POWER_SUPPLY_PROP_VOLTAGE_MIN,
POWER_SUPPLY_PROP_CURRENT_MAX,
};
static const struct power_supply_desc axp20x_usb_power_desc = {
.name = "axp20x-usb",
.type = POWER_SUPPLY_TYPE_USB,
.properties = axp20x_usb_power_properties,
.num_properties = ARRAY_SIZE(axp20x_usb_power_properties),
.property_is_writeable = axp20x_usb_power_prop_writeable,
.get_property = axp20x_usb_power_get_property,
.set_property = axp20x_usb_power_set_property,
};
static const struct power_supply_desc axp22x_usb_power_desc = {
.name = "axp20x-usb",
.type = POWER_SUPPLY_TYPE_USB,
.properties = axp22x_usb_power_properties,
.num_properties = ARRAY_SIZE(axp22x_usb_power_properties),
.property_is_writeable = axp20x_usb_power_prop_writeable,
.get_property = axp20x_usb_power_get_property,
.set_property = axp20x_usb_power_set_property,
};
static int configure_iio_channels(struct platform_device *pdev,
struct axp20x_usb_power *power)
{
power->vbus_v = devm_iio_channel_get(&pdev->dev, "vbus_v");
if (IS_ERR(power->vbus_v)) {
if (PTR_ERR(power->vbus_v) == -ENODEV)
return -EPROBE_DEFER;
return PTR_ERR(power->vbus_v);
}
power->vbus_i = devm_iio_channel_get(&pdev->dev, "vbus_i");
if (IS_ERR(power->vbus_i)) {
if (PTR_ERR(power->vbus_i) == -ENODEV)
return -EPROBE_DEFER;
return PTR_ERR(power->vbus_i);
}
return 0;
}
static int configure_adc_registers(struct axp20x_usb_power *power)
{
/* Enable vbus voltage and current measurement */
return regmap_update_bits(power->regmap, AXP20X_ADC_EN1,
AXP20X_ADC_EN1_VBUS_CURR |
AXP20X_ADC_EN1_VBUS_VOLT,
AXP20X_ADC_EN1_VBUS_CURR |
AXP20X_ADC_EN1_VBUS_VOLT);
}
static int axp20x_usb_power_probe(struct platform_device *pdev)
{
struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
struct power_supply_config psy_cfg = {};
struct axp20x_usb_power *power;
static const char * const axp20x_irq_names[] = { "VBUS_PLUGIN",
"VBUS_REMOVAL", "VBUS_VALID", "VBUS_NOT_VALID", NULL };
static const char * const axp22x_irq_names[] = {
"VBUS_PLUGIN", "VBUS_REMOVAL", NULL };
const char * const *irq_names;
const struct power_supply_desc *usb_power_desc;
int i, irq, ret;
if (!of_device_is_available(pdev->dev.of_node))
return -ENODEV;
if (!axp20x) {
dev_err(&pdev->dev, "Parent drvdata not set\n");
return -EINVAL;
}
power = devm_kzalloc(&pdev->dev, sizeof(*power), GFP_KERNEL);
if (!power)
return -ENOMEM;
platform_set_drvdata(pdev, power);
power->axp20x_id = (enum axp20x_variants)of_device_get_match_data(
&pdev->dev);
power->np = pdev->dev.of_node;
power->regmap = axp20x->regmap;
if (power->axp20x_id == AXP202_ID) {
/* Enable vbus valid checking */
ret = regmap_update_bits(power->regmap, AXP20X_VBUS_MON,
AXP20X_VBUS_MON_VBUS_VALID,
AXP20X_VBUS_MON_VBUS_VALID);
if (ret)
return ret;
if (IS_ENABLED(CONFIG_AXP20X_ADC))
ret = configure_iio_channels(pdev, power);
else
ret = configure_adc_registers(power);
if (ret)
return ret;
usb_power_desc = &axp20x_usb_power_desc;
irq_names = axp20x_irq_names;
} else if (power->axp20x_id == AXP221_ID ||
power->axp20x_id == AXP223_ID ||
power->axp20x_id == AXP813_ID) {
usb_power_desc = &axp22x_usb_power_desc;
irq_names = axp22x_irq_names;
} else {
dev_err(&pdev->dev, "Unsupported AXP variant: %ld\n",
axp20x->variant);
return -EINVAL;
}
psy_cfg.of_node = pdev->dev.of_node;
psy_cfg.drv_data = power;
power->supply = devm_power_supply_register(&pdev->dev, usb_power_desc,
&psy_cfg);
if (IS_ERR(power->supply))
return PTR_ERR(power->supply);
/* Request irqs after registering, as irqs may trigger immediately */
for (i = 0; irq_names[i]; i++) {
irq = platform_get_irq_byname(pdev, irq_names[i]);
if (irq < 0) {
dev_warn(&pdev->dev, "No IRQ for %s: %d\n",
irq_names[i], irq);
continue;
}
irq = regmap_irq_get_virq(axp20x->regmap_irqc, irq);
ret = devm_request_any_context_irq(&pdev->dev, irq,
axp20x_usb_power_irq, 0, DRVNAME, power);
if (ret < 0)
dev_warn(&pdev->dev, "Error requesting %s IRQ: %d\n",
irq_names[i], ret);
}
INIT_DELAYED_WORK(&power->vbus_detect, axp20x_usb_power_poll_vbus);
if (axp20x_usb_vbus_needs_polling(power))
queue_delayed_work(system_wq, &power->vbus_detect, 0);
return 0;
}
static int axp20x_usb_power_remove(struct platform_device *pdev)
{
struct axp20x_usb_power *power = platform_get_drvdata(pdev);
cancel_delayed_work_sync(&power->vbus_detect);
return 0;
}
static const struct of_device_id axp20x_usb_power_match[] = {
{
.compatible = "x-powers,axp202-usb-power-supply",
.data = (void *)AXP202_ID,
}, {
.compatible = "x-powers,axp221-usb-power-supply",
.data = (void *)AXP221_ID,
}, {
.compatible = "x-powers,axp223-usb-power-supply",
.data = (void *)AXP223_ID,
}, {
.compatible = "x-powers,axp813-usb-power-supply",
.data = (void *)AXP813_ID,
}, { /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, axp20x_usb_power_match);
static struct platform_driver axp20x_usb_power_driver = {
.probe = axp20x_usb_power_probe,
.remove = axp20x_usb_power_remove,
.driver = {
.name = DRVNAME,
.of_match_table = axp20x_usb_power_match,
},
};
module_platform_driver(axp20x_usb_power_driver);
MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
MODULE_DESCRIPTION("AXP20x PMIC USB power supply status driver");
MODULE_LICENSE("GPL");
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