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>hifive-unleashed-5.1
Hans de Goede
Sebastian Reichel
parent
264905209a
commit
69fb4dcada
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@ -472,6 +472,13 @@ config CHARGER_RT9455
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help
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Say Y to enable support for Richtek RT9455 battery charger.
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config AXP20X_POWER
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tristate "AXP20x power supply driver"
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depends on MFD_AXP20X
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help
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This driver provides support for the power supply features of
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AXP20x PMIC.
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source "drivers/power/reset/Kconfig"
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endif # POWER_SUPPLY
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@ -9,6 +9,7 @@ obj-$(CONFIG_GENERIC_ADC_BATTERY) += generic-adc-battery.o
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obj-$(CONFIG_PDA_POWER) += pda_power.o
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obj-$(CONFIG_APM_POWER) += apm_power.o
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obj-$(CONFIG_AXP20X_POWER) += axp20x_usb_power.o
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obj-$(CONFIG_MAX8925_POWER) += max8925_power.o
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obj-$(CONFIG_WM831X_BACKUP) += wm831x_backup.o
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obj-$(CONFIG_WM831X_POWER) += wm831x_power.o
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@ -0,0 +1,248 @@
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/*
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* AXP20x PMIC USB power supply status driver
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*
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* Copyright (C) 2015 Hans de Goede <hdegoede@redhat.com>
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* Copyright (C) 2014 Bruno Prémont <bonbons@linux-vserver.org>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/device.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <linux/mfd/axp20x.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/power_supply.h>
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#include <linux/regmap.h>
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#include <linux/slab.h>
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#define DRVNAME "axp20x-usb-power-supply"
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#define AXP20X_PWR_STATUS_VBUS_PRESENT BIT(5)
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#define AXP20X_PWR_STATUS_VBUS_USED BIT(4)
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#define AXP20X_USB_STATUS_VBUS_VALID BIT(2)
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#define AXP20X_VBUS_VHOLD_uV(b) (4000000 + (((b) >> 3) & 7) * 100000)
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#define AXP20X_VBUS_CLIMIT_MASK 3
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#define AXP20X_VBUC_CLIMIT_900mA 0
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#define AXP20X_VBUC_CLIMIT_500mA 1
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#define AXP20X_VBUC_CLIMIT_100mA 2
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#define AXP20X_VBUC_CLIMIT_NONE 3
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#define AXP20X_ADC_EN1_VBUS_CURR BIT(2)
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#define AXP20X_ADC_EN1_VBUS_VOLT BIT(3)
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#define AXP20X_VBUS_MON_VBUS_VALID BIT(3)
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struct axp20x_usb_power {
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struct regmap *regmap;
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struct power_supply *supply;
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};
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static irqreturn_t axp20x_usb_power_irq(int irq, void *devid)
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{
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struct axp20x_usb_power *power = devid;
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power_supply_changed(power->supply);
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return IRQ_HANDLED;
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}
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static int axp20x_usb_power_get_property(struct power_supply *psy,
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enum power_supply_property psp, union power_supply_propval *val)
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{
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struct axp20x_usb_power *power = power_supply_get_drvdata(psy);
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unsigned int input, v;
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int ret;
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switch (psp) {
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case POWER_SUPPLY_PROP_VOLTAGE_MIN:
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ret = regmap_read(power->regmap, AXP20X_VBUS_IPSOUT_MGMT, &v);
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if (ret)
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return ret;
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val->intval = AXP20X_VBUS_VHOLD_uV(v);
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return 0;
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case POWER_SUPPLY_PROP_VOLTAGE_NOW:
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ret = axp20x_read_variable_width(power->regmap,
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AXP20X_VBUS_V_ADC_H, 12);
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if (ret < 0)
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return ret;
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val->intval = ret * 1700; /* 1 step = 1.7 mV */
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return 0;
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case POWER_SUPPLY_PROP_CURRENT_MAX:
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ret = regmap_read(power->regmap, AXP20X_VBUS_IPSOUT_MGMT, &v);
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if (ret)
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return ret;
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switch (v & AXP20X_VBUS_CLIMIT_MASK) {
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case AXP20X_VBUC_CLIMIT_100mA:
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val->intval = 100000;
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break;
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case AXP20X_VBUC_CLIMIT_500mA:
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val->intval = 500000;
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break;
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case AXP20X_VBUC_CLIMIT_900mA:
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val->intval = 900000;
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break;
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case AXP20X_VBUC_CLIMIT_NONE:
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val->intval = -1;
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break;
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}
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return 0;
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case POWER_SUPPLY_PROP_CURRENT_NOW:
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ret = axp20x_read_variable_width(power->regmap,
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AXP20X_VBUS_I_ADC_H, 12);
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if (ret < 0)
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return ret;
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val->intval = ret * 375; /* 1 step = 0.375 mA */
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return 0;
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default:
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break;
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}
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/* All the properties below need the input-status reg value */
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ret = regmap_read(power->regmap, AXP20X_PWR_INPUT_STATUS, &input);
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if (ret)
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return ret;
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switch (psp) {
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case POWER_SUPPLY_PROP_HEALTH:
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if (!(input & AXP20X_PWR_STATUS_VBUS_PRESENT)) {
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val->intval = POWER_SUPPLY_HEALTH_UNKNOWN;
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break;
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}
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ret = regmap_read(power->regmap, AXP20X_USB_OTG_STATUS, &v);
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if (ret)
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return ret;
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if (!(v & AXP20X_USB_STATUS_VBUS_VALID)) {
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val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
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break;
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}
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val->intval = POWER_SUPPLY_HEALTH_GOOD;
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break;
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case POWER_SUPPLY_PROP_PRESENT:
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val->intval = !!(input & AXP20X_PWR_STATUS_VBUS_PRESENT);
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break;
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case POWER_SUPPLY_PROP_ONLINE:
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val->intval = !!(input & AXP20X_PWR_STATUS_VBUS_USED);
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static enum power_supply_property axp20x_usb_power_properties[] = {
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POWER_SUPPLY_PROP_HEALTH,
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POWER_SUPPLY_PROP_PRESENT,
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POWER_SUPPLY_PROP_ONLINE,
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POWER_SUPPLY_PROP_VOLTAGE_MIN,
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POWER_SUPPLY_PROP_VOLTAGE_NOW,
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POWER_SUPPLY_PROP_CURRENT_MAX,
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POWER_SUPPLY_PROP_CURRENT_NOW,
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};
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static const struct power_supply_desc axp20x_usb_power_desc = {
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.name = "axp20x-usb",
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.type = POWER_SUPPLY_TYPE_USB,
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.properties = axp20x_usb_power_properties,
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.num_properties = ARRAY_SIZE(axp20x_usb_power_properties),
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.get_property = axp20x_usb_power_get_property,
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};
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static int axp20x_usb_power_probe(struct platform_device *pdev)
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{
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struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
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struct power_supply_config psy_cfg = {};
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struct axp20x_usb_power *power;
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static const char * const irq_names[] = { "VBUS_PLUGIN",
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"VBUS_REMOVAL", "VBUS_VALID", "VBUS_NOT_VALID" };
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int i, irq, ret;
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if (!of_device_is_available(pdev->dev.of_node))
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return -ENODEV;
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if (!axp20x) {
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dev_err(&pdev->dev, "Parent drvdata not set\n");
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return -EINVAL;
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}
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power = devm_kzalloc(&pdev->dev, sizeof(*power), GFP_KERNEL);
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if (!power)
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return -ENOMEM;
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power->regmap = axp20x->regmap;
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/* Enable vbus valid checking */
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ret = regmap_update_bits(power->regmap, AXP20X_VBUS_MON,
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AXP20X_VBUS_MON_VBUS_VALID, AXP20X_VBUS_MON_VBUS_VALID);
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if (ret)
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return ret;
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/* Enable vbus voltage and current measurement */
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ret = regmap_update_bits(power->regmap, AXP20X_ADC_EN1,
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AXP20X_ADC_EN1_VBUS_CURR | AXP20X_ADC_EN1_VBUS_VOLT,
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AXP20X_ADC_EN1_VBUS_CURR | AXP20X_ADC_EN1_VBUS_VOLT);
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if (ret)
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return ret;
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psy_cfg.of_node = pdev->dev.of_node;
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psy_cfg.drv_data = power;
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power->supply = devm_power_supply_register(&pdev->dev,
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&axp20x_usb_power_desc, &psy_cfg);
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if (IS_ERR(power->supply))
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return PTR_ERR(power->supply);
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/* Request irqs after registering, as irqs may trigger immediately */
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for (i = 0; i < ARRAY_SIZE(irq_names); i++) {
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irq = platform_get_irq_byname(pdev, irq_names[i]);
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if (irq < 0) {
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dev_warn(&pdev->dev, "No IRQ for %s: %d\n",
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irq_names[i], irq);
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continue;
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}
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irq = regmap_irq_get_virq(axp20x->regmap_irqc, irq);
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ret = devm_request_any_context_irq(&pdev->dev, irq,
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axp20x_usb_power_irq, 0, DRVNAME, power);
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if (ret < 0)
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dev_warn(&pdev->dev, "Error requesting %s IRQ: %d\n",
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irq_names[i], ret);
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}
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return 0;
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}
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static const struct of_device_id axp20x_usb_power_match[] = {
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{ .compatible = "x-powers,axp202-usb-power-supply" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, axp20x_usb_power_match);
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static struct platform_driver axp20x_usb_power_driver = {
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.probe = axp20x_usb_power_probe,
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.driver = {
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.name = DRVNAME,
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.of_match_table = axp20x_usb_power_match,
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},
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};
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module_platform_driver(axp20x_usb_power_driver);
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MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
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MODULE_DESCRIPTION("AXP20x PMIC USB power supply status driver");
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MODULE_LICENSE("GPL");
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@ -11,6 +11,8 @@
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#ifndef __LINUX_MFD_AXP20X_H
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#define __LINUX_MFD_AXP20X_H
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#include <linux/regmap.h>
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enum {
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AXP152_ID = 0,
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AXP202_ID,
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@ -438,4 +440,26 @@ struct axp288_extcon_pdata {
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struct gpio_desc *gpio_mux_cntl;
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};
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/* generic helper function for reading 9-16 bit wide regs */
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static inline int axp20x_read_variable_width(struct regmap *regmap,
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unsigned int reg, unsigned int width)
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{
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unsigned int reg_val, result;
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int err;
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err = regmap_read(regmap, reg, ®_val);
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if (err)
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return err;
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result = reg_val << (width - 8);
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err = regmap_read(regmap, reg + 1, ®_val);
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if (err)
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return err;
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result |= reg_val;
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return result;
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}
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#endif /* __LINUX_MFD_AXP20X_H */
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