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Release 4.11 drivers/power/supply/axp20x_ac_power.c

/*
 * AXP20X and AXP22X PMICs' ACIN power supply driver
 *
 * Copyright (C) 2016 Free Electrons
 *      Quentin Schulz <quentin.schulz@free-electrons.com>
 *
 * 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/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>


#define AXP20X_PWR_STATUS_ACIN_PRESENT	BIT(7)

#define AXP20X_PWR_STATUS_ACIN_AVAIL	BIT(6)


#define DRVNAME "axp20x-ac-power-supply"


struct axp20x_ac_power {
	
struct regmap *regmap;
	
struct power_supply *supply;
	
struct iio_channel *acin_v;
	
struct iio_channel *acin_i;
};


static irqreturn_t axp20x_ac_power_irq(int irq, void *devid) { struct axp20x_ac_power *power = devid; power_supply_changed(power->supply); return IRQ_HANDLED; }

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static int axp20x_ac_power_get_property(struct power_supply *psy, enum power_supply_property psp, union power_supply_propval *val) { struct axp20x_ac_power *power = power_supply_get_drvdata(psy); int ret, reg; switch (psp) { case POWER_SUPPLY_PROP_HEALTH: ret = regmap_read(power->regmap, AXP20X_PWR_INPUT_STATUS, &reg); if (ret) return ret; if (reg & AXP20X_PWR_STATUS_ACIN_PRESENT) { val->intval = POWER_SUPPLY_HEALTH_GOOD; return 0; } val->intval = POWER_SUPPLY_HEALTH_UNKNOWN; return 0; case POWER_SUPPLY_PROP_PRESENT: ret = regmap_read(power->regmap, AXP20X_PWR_INPUT_STATUS, &reg); if (ret) return ret; val->intval = !!(reg & AXP20X_PWR_STATUS_ACIN_PRESENT); return 0; case POWER_SUPPLY_PROP_ONLINE: ret = regmap_read(power->regmap, AXP20X_PWR_INPUT_STATUS, &reg); if (ret) return ret; val->intval = !!(reg & AXP20X_PWR_STATUS_ACIN_AVAIL); return 0; case POWER_SUPPLY_PROP_VOLTAGE_NOW: ret = iio_read_channel_processed(power->acin_v, &val->intval); if (ret) return ret; /* IIO framework gives mV but Power Supply framework gives uV */ val->intval *= 1000; return 0; case POWER_SUPPLY_PROP_CURRENT_NOW: ret = iio_read_channel_processed(power->acin_i, &val->intval); if (ret) return ret; /* IIO framework gives mA but Power Supply framework gives uA */ val->intval *= 1000; return 0; default: return -EINVAL; } return -EINVAL; }

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static enum power_supply_property axp20x_ac_power_properties[] = { POWER_SUPPLY_PROP_HEALTH, POWER_SUPPLY_PROP_PRESENT, POWER_SUPPLY_PROP_ONLINE, POWER_SUPPLY_PROP_VOLTAGE_NOW, POWER_SUPPLY_PROP_CURRENT_NOW, }; static enum power_supply_property axp22x_ac_power_properties[] = { POWER_SUPPLY_PROP_HEALTH, POWER_SUPPLY_PROP_PRESENT, POWER_SUPPLY_PROP_ONLINE, }; static const struct power_supply_desc axp20x_ac_power_desc = { .name = "axp20x-ac", .type = POWER_SUPPLY_TYPE_MAINS, .properties = axp20x_ac_power_properties, .num_properties = ARRAY_SIZE(axp20x_ac_power_properties), .get_property = axp20x_ac_power_get_property, }; static const struct power_supply_desc axp22x_ac_power_desc = { .name = "axp22x-ac", .type = POWER_SUPPLY_TYPE_MAINS, .properties = axp22x_ac_power_properties, .num_properties = ARRAY_SIZE(axp22x_ac_power_properties), .get_property = axp20x_ac_power_get_property, }; struct axp_data { const struct power_supply_desc *power_desc; bool acin_adc; }; static const struct axp_data axp20x_data = { .power_desc = &axp20x_ac_power_desc, .acin_adc = true, }; static const struct axp_data axp22x_data = { .power_desc = &axp22x_ac_power_desc, .acin_adc = false, };
static int axp20x_ac_power_probe(struct platform_device *pdev) { struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent); struct power_supply_config psy_cfg = {}; struct axp20x_ac_power *power; struct axp_data *axp_data; static const char * const irq_names[] = { "ACIN_PLUGIN", "ACIN_REMOVAL", NULL }; 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; axp_data = (struct axp_data *)of_device_get_match_data(&pdev->dev); if (axp_data->acin_adc) { power->acin_v = devm_iio_channel_get(&pdev->dev, "acin_v"); if (IS_ERR(power->acin_v)) { if (PTR_ERR(power->acin_v) == -ENODEV) return -EPROBE_DEFER; return PTR_ERR(power->acin_v); } power->acin_i = devm_iio_channel_get(&pdev->dev, "acin_i"); if (IS_ERR(power->acin_i)) { if (PTR_ERR(power->acin_i) == -ENODEV) return -EPROBE_DEFER; return PTR_ERR(power->acin_i); } } power->regmap = dev_get_regmap(pdev->dev.parent, NULL); platform_set_drvdata(pdev, power); psy_cfg.of_node = pdev->dev.of_node; psy_cfg.drv_data = power; power->supply = devm_power_supply_register(&pdev->dev, axp_data->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_ac_power_irq, 0, DRVNAME, power); if (ret < 0) dev_warn(&pdev->dev, "Error requesting %s IRQ: %d\n", irq_names[i], ret); } return 0; }

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static const struct of_device_id axp20x_ac_power_match[] = { { .compatible = "x-powers,axp202-ac-power-supply", .data = (void *)&axp20x_data, }, { .compatible = "x-powers,axp221-ac-power-supply", .data = (void *)&axp22x_data, }, { /* sentinel */ } }; MODULE_DEVICE_TABLE(of, axp20x_ac_power_match); static struct platform_driver axp20x_ac_power_driver = { .probe = axp20x_ac_power_probe, .driver = { .name = DRVNAME, .of_match_table = axp20x_ac_power_match, }, }; module_platform_driver(axp20x_ac_power_driver); MODULE_AUTHOR("Quentin Schulz <quentin.schulz@free-electrons.com>"); MODULE_DESCRIPTION("AXP20X and AXP22X PMICs' AC power supply driver"); MODULE_LICENSE("GPL");

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