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linux-next/drivers/power/axp20x_usb_power.c
Hans de Goede 69fb4dcada power: Add an axp20x-usb-power driver 
This adds a driver for the usb power_supply bits of the axp20x PMICs.

I initially started writing my own driver, before coming aware of
Bruno Prémont's excellent earlier RFC with a driver for this.

My driver was lacking CURRENT_MAX and VOLTAGE_MIN support Bruno's
drvier has, so I've copied the code for those from his driver.

Note that the AC-power-supply and battery charger bits will need separate
drivers. Each one needs its own devictree child-node so that other
devicetree nodes can reference the right power-supply, and thus each one
will get its own mfd-cell / platform_device and platform-driver.

Cc: Bruno Prémont <bonbons@linux-vserver.org>
Acked-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Bruno Prémont <bonbons@linux-vserver.org>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Sebastian Reichel <sre@kernel.org>
2015-09-22 13:35:28 +02:00

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/*
* 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>
*
* 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.
*/
#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/platform_device.h>
#include <linux/power_supply.h>
#include <linux/regmap.h>
#include <linux/slab.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_CLIMIT_MASK 3
#define AXP20X_VBUC_CLIMIT_900mA 0
#define AXP20X_VBUC_CLIMIT_500mA 1
#define AXP20X_VBUC_CLIMIT_100mA 2
#define AXP20X_VBUC_CLIMIT_NONE 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)
struct axp20x_usb_power {
struct regmap *regmap;
struct power_supply *supply;
};
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 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:
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:
ret = regmap_read(power->regmap, AXP20X_VBUS_IPSOUT_MGMT, &v);
if (ret)
return ret;
switch (v & AXP20X_VBUS_CLIMIT_MASK) {
case AXP20X_VBUC_CLIMIT_100mA:
val->intval = 100000;
break;
case AXP20X_VBUC_CLIMIT_500mA:
val->intval = 500000;
break;
case AXP20X_VBUC_CLIMIT_900mA:
val->intval = 900000;
break;
case AXP20X_VBUC_CLIMIT_NONE:
val->intval = -1;
break;
}
return 0;
case POWER_SUPPLY_PROP_CURRENT_NOW:
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;
}
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;
}
val->intval = POWER_SUPPLY_HEALTH_GOOD;
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 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 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),
.get_property = axp20x_usb_power_get_property,
};
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 irq_names[] = { "VBUS_PLUGIN",
"VBUS_REMOVAL", "VBUS_VALID", "VBUS_NOT_VALID" };
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;
power->regmap = axp20x->regmap;
/* 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;
/* Enable vbus voltage and current measurement */
ret = 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);
if (ret)
return ret;
psy_cfg.of_node = pdev->dev.of_node;
psy_cfg.drv_data = power;
power->supply = devm_power_supply_register(&pdev->dev,
&axp20x_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; i < ARRAY_SIZE(irq_names); 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);
}
return 0;
}
static const struct of_device_id axp20x_usb_power_match[] = {
{ .compatible = "x-powers,axp202-usb-power-supply" },
{ }
};
MODULE_DEVICE_TABLE(of, axp20x_usb_power_match);
static struct platform_driver axp20x_usb_power_driver = {
.probe = axp20x_usb_power_probe,
.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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