--- /dev/null
+/*
+ * 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");
projects / karo-tx-linux.git / commitdiff