573 строки
14 KiB
C
573 строки
14 KiB
C
/*
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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/bitops.h>
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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/of_device.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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#include <linux/iio/consumer.h>
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#include <linux/workqueue.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_VHOLD_MASK GENMASK(5, 3)
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#define AXP20X_VBUS_VHOLD_OFFSET 3
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#define AXP20X_VBUS_CLIMIT_MASK 3
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#define AXP20X_VBUS_CLIMIT_900mA 0
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#define AXP20X_VBUS_CLIMIT_500mA 1
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#define AXP20X_VBUS_CLIMIT_100mA 2
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#define AXP20X_VBUS_CLIMIT_NONE 3
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#define AXP813_VBUS_CLIMIT_900mA 0
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#define AXP813_VBUS_CLIMIT_1500mA 1
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#define AXP813_VBUS_CLIMIT_2000mA 2
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#define AXP813_VBUS_CLIMIT_2500mA 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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/*
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* Note do not raise the debounce time, we must report Vusb high within
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* 100ms otherwise we get Vbus errors in musb.
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*/
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#define DEBOUNCE_TIME msecs_to_jiffies(50)
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struct axp20x_usb_power {
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struct device_node *np;
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struct regmap *regmap;
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struct power_supply *supply;
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enum axp20x_variants axp20x_id;
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struct iio_channel *vbus_v;
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struct iio_channel *vbus_i;
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struct delayed_work vbus_detect;
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unsigned int old_status;
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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 void axp20x_usb_power_poll_vbus(struct work_struct *work)
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{
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struct axp20x_usb_power *power =
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container_of(work, struct axp20x_usb_power, vbus_detect.work);
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unsigned int val;
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int ret;
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ret = regmap_read(power->regmap, AXP20X_PWR_INPUT_STATUS, &val);
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if (ret)
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goto out;
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val &= (AXP20X_PWR_STATUS_VBUS_PRESENT | AXP20X_PWR_STATUS_VBUS_USED);
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if (val != power->old_status)
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power_supply_changed(power->supply);
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power->old_status = val;
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out:
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mod_delayed_work(system_wq, &power->vbus_detect, DEBOUNCE_TIME);
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}
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static bool axp20x_usb_vbus_needs_polling(struct axp20x_usb_power *power)
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{
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if (power->axp20x_id >= AXP221_ID)
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return true;
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return false;
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}
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static int axp20x_get_current_max(struct axp20x_usb_power *power, int *val)
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{
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unsigned int v;
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int 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_VBUS_CLIMIT_100mA:
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if (power->axp20x_id == AXP221_ID)
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*val = -1; /* No 100mA limit */
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else
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*val = 100000;
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break;
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case AXP20X_VBUS_CLIMIT_500mA:
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*val = 500000;
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break;
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case AXP20X_VBUS_CLIMIT_900mA:
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*val = 900000;
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break;
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case AXP20X_VBUS_CLIMIT_NONE:
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*val = -1;
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break;
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}
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return 0;
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}
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static int axp813_get_current_max(struct axp20x_usb_power *power, int *val)
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{
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unsigned int v;
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int 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 AXP813_VBUS_CLIMIT_900mA:
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*val = 900000;
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break;
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case AXP813_VBUS_CLIMIT_1500mA:
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*val = 1500000;
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break;
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case AXP813_VBUS_CLIMIT_2000mA:
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*val = 2000000;
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break;
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case AXP813_VBUS_CLIMIT_2500mA:
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*val = 2500000;
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break;
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}
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return 0;
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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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if (IS_ENABLED(CONFIG_AXP20X_ADC)) {
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ret = iio_read_channel_processed(power->vbus_v,
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&val->intval);
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if (ret)
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return ret;
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/*
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* IIO framework gives mV but Power Supply framework
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* gives uV.
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*/
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val->intval *= 1000;
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return 0;
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}
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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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if (power->axp20x_id == AXP813_ID)
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return axp813_get_current_max(power, &val->intval);
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return axp20x_get_current_max(power, &val->intval);
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case POWER_SUPPLY_PROP_CURRENT_NOW:
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if (IS_ENABLED(CONFIG_AXP20X_ADC)) {
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ret = iio_read_channel_processed(power->vbus_i,
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&val->intval);
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if (ret)
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return ret;
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/*
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* IIO framework gives mA but Power Supply framework
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* gives uA.
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*/
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val->intval *= 1000;
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return 0;
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}
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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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val->intval = POWER_SUPPLY_HEALTH_GOOD;
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if (power->axp20x_id == AXP202_ID) {
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ret = regmap_read(power->regmap,
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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 =
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POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
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}
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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 int axp20x_usb_power_set_voltage_min(struct axp20x_usb_power *power,
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int intval)
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{
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int val;
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switch (intval) {
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case 4000000:
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case 4100000:
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case 4200000:
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case 4300000:
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case 4400000:
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case 4500000:
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case 4600000:
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case 4700000:
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val = (intval - 4000000) / 100000;
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return regmap_update_bits(power->regmap,
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AXP20X_VBUS_IPSOUT_MGMT,
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AXP20X_VBUS_VHOLD_MASK,
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val << AXP20X_VBUS_VHOLD_OFFSET);
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default:
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return -EINVAL;
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}
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return -EINVAL;
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}
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static int axp813_usb_power_set_current_max(struct axp20x_usb_power *power,
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int intval)
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{
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int val;
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switch (intval) {
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case 900000:
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return regmap_update_bits(power->regmap,
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AXP20X_VBUS_IPSOUT_MGMT,
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AXP20X_VBUS_CLIMIT_MASK,
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AXP813_VBUS_CLIMIT_900mA);
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case 1500000:
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case 2000000:
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case 2500000:
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val = (intval - 1000000) / 500000;
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return regmap_update_bits(power->regmap,
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AXP20X_VBUS_IPSOUT_MGMT,
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AXP20X_VBUS_CLIMIT_MASK, val);
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default:
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return -EINVAL;
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}
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return -EINVAL;
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}
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static int axp20x_usb_power_set_current_max(struct axp20x_usb_power *power,
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int intval)
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{
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int val;
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switch (intval) {
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case 100000:
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if (power->axp20x_id == AXP221_ID)
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return -EINVAL;
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/* fall through */
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case 500000:
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case 900000:
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val = (900000 - intval) / 400000;
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return regmap_update_bits(power->regmap,
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AXP20X_VBUS_IPSOUT_MGMT,
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AXP20X_VBUS_CLIMIT_MASK, val);
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default:
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return -EINVAL;
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}
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return -EINVAL;
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}
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static int axp20x_usb_power_set_property(struct power_supply *psy,
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enum power_supply_property psp,
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const 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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switch (psp) {
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case POWER_SUPPLY_PROP_VOLTAGE_MIN:
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return axp20x_usb_power_set_voltage_min(power, val->intval);
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case POWER_SUPPLY_PROP_CURRENT_MAX:
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if (power->axp20x_id == AXP813_ID)
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return axp813_usb_power_set_current_max(power,
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val->intval);
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return axp20x_usb_power_set_current_max(power, val->intval);
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default:
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return -EINVAL;
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}
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return -EINVAL;
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}
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static int axp20x_usb_power_prop_writeable(struct power_supply *psy,
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enum power_supply_property psp)
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{
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return psp == POWER_SUPPLY_PROP_VOLTAGE_MIN ||
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psp == POWER_SUPPLY_PROP_CURRENT_MAX;
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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 enum power_supply_property axp22x_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_CURRENT_MAX,
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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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.property_is_writeable = axp20x_usb_power_prop_writeable,
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.get_property = axp20x_usb_power_get_property,
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.set_property = axp20x_usb_power_set_property,
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};
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static const struct power_supply_desc axp22x_usb_power_desc = {
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.name = "axp20x-usb",
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.type = POWER_SUPPLY_TYPE_USB,
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.properties = axp22x_usb_power_properties,
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.num_properties = ARRAY_SIZE(axp22x_usb_power_properties),
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.property_is_writeable = axp20x_usb_power_prop_writeable,
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.get_property = axp20x_usb_power_get_property,
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.set_property = axp20x_usb_power_set_property,
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};
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static int configure_iio_channels(struct platform_device *pdev,
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struct axp20x_usb_power *power)
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{
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power->vbus_v = devm_iio_channel_get(&pdev->dev, "vbus_v");
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if (IS_ERR(power->vbus_v)) {
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if (PTR_ERR(power->vbus_v) == -ENODEV)
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return -EPROBE_DEFER;
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return PTR_ERR(power->vbus_v);
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}
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power->vbus_i = devm_iio_channel_get(&pdev->dev, "vbus_i");
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if (IS_ERR(power->vbus_i)) {
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if (PTR_ERR(power->vbus_i) == -ENODEV)
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return -EPROBE_DEFER;
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return PTR_ERR(power->vbus_i);
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}
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return 0;
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}
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static int configure_adc_registers(struct axp20x_usb_power *power)
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{
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/* Enable vbus voltage and current measurement */
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return regmap_update_bits(power->regmap, AXP20X_ADC_EN1,
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AXP20X_ADC_EN1_VBUS_CURR |
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AXP20X_ADC_EN1_VBUS_VOLT,
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AXP20X_ADC_EN1_VBUS_CURR |
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AXP20X_ADC_EN1_VBUS_VOLT);
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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 axp20x_irq_names[] = { "VBUS_PLUGIN",
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"VBUS_REMOVAL", "VBUS_VALID", "VBUS_NOT_VALID", NULL };
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static const char * const axp22x_irq_names[] = {
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"VBUS_PLUGIN", "VBUS_REMOVAL", NULL };
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const char * const *irq_names;
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const struct power_supply_desc *usb_power_desc;
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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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platform_set_drvdata(pdev, power);
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power->axp20x_id = (enum axp20x_variants)of_device_get_match_data(
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&pdev->dev);
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power->np = pdev->dev.of_node;
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power->regmap = axp20x->regmap;
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if (power->axp20x_id == AXP202_ID) {
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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,
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AXP20X_VBUS_MON_VBUS_VALID);
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if (ret)
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return ret;
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if (IS_ENABLED(CONFIG_AXP20X_ADC))
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ret = configure_iio_channels(pdev, power);
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else
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ret = configure_adc_registers(power);
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if (ret)
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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");
|