This adds a driver for the ac power_supply bits of the axp20x PMICs. This submission is taken directly from Bruno Prémonts 2015 RFC [0]. The original RFC contains drivers for AC, battery and backup battery. This commit only adds the AC driver for now. [0] http://permalink.gmane.org/gmane.comp.hardware.netbook.arm.sunxi/17980 Signed-off-by: Michael Haas <haas@xxxxxxxxxxxxxxxxxxxx> --- drivers/power/Makefile | 2 +- drivers/power/axp20x_ac_power.c | 181 ++++++++++++++++++++++++++++++++++++++++ 2 files changed, 182 insertions(+), 1 deletion(-) create mode 100644 drivers/power/axp20x_ac_power.c diff --git a/drivers/power/Makefile b/drivers/power/Makefile index e46b75d..3a785cc 100644 --- a/drivers/power/Makefile +++ b/drivers/power/Makefile @@ -9,7 +9,7 @@ obj-$(CONFIG_GENERIC_ADC_BATTERY) += generic-adc-battery.o obj-$(CONFIG_PDA_POWER) += pda_power.o obj-$(CONFIG_APM_POWER) += apm_power.o -obj-$(CONFIG_AXP20X_POWER) += axp20x_usb_power.o +obj-$(CONFIG_AXP20X_POWER) += axp20x_usb_power.o axp20x_ac_power.o obj-$(CONFIG_MAX8925_POWER) += max8925_power.o obj-$(CONFIG_WM831X_BACKUP) += wm831x_backup.o obj-$(CONFIG_WM831X_POWER) += wm831x_power.o diff --git a/drivers/power/axp20x_ac_power.c b/drivers/power/axp20x_ac_power.c new file mode 100644 index 0000000..0d1ca0e --- /dev/null +++ b/drivers/power/axp20x_ac_power.c @@ -0,0 +1,181 @@ +/* + * AXP20x PMIC AC power driver + * + * Copyright 2014-2015 Bruno Prémont <bonbons@xxxxxxxxxxxxxxxxx> + * + * 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/err.h> +#include <linux/interrupt.h> +#include <linux/irq.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-ac-power" + + +/* Fields of AXP20X_PWR_INPUT_STATUS */ +#define AXP20X_PWR_STATUS_AC_PRESENT BIT(7) +#define AXP20X_PWR_STATUS_AC_AVAILABLE BIT(6) +#define AXP20X_PWR_STATUS_AC_VBUS_SHORT BIT(1) +#define AXP20X_PWR_STATUS_AC_VBUS_SEL BIT(0) + +/* Fields of AXP20X_ADC_EN1 */ +#define AXP20X_ADC_EN1_ACIN_VOLT BIT(5) +#define AXP20X_ADC_EN1_ACIN_CURR BIT(4) + + +struct axp20x_ac_power { + struct regmap *regmap; + struct power_supply *supply; +}; + +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); + unsigned int input; + int r; + + switch (psp) { + case POWER_SUPPLY_PROP_VOLTAGE_NOW: + r = axp20x_read_variable_width(power->regmap, + AXP20X_ACIN_V_ADC_H, 12); + if (r < 0) + return r; + + val->intval = r * 1700; /* 1 step = 1.7 mV */ + return 0; + case POWER_SUPPLY_PROP_CURRENT_NOW: + r = axp20x_read_variable_width(power->regmap, + AXP20X_ACIN_I_ADC_H, 12); + if (r < 0) + return r; + + val->intval = r * 375; /* 1 step = 0.375 mA */ + return 0; + default: + break; + } + + /* All the properties below need the input-status reg value */ + r = regmap_read(power->regmap, AXP20X_PWR_INPUT_STATUS, &input); + if (r) + return r; + + switch (psp) { + case POWER_SUPPLY_PROP_PRESENT: + val->intval = !!(input & AXP20X_PWR_STATUS_AC_PRESENT); + break; + case POWER_SUPPLY_PROP_ONLINE: + val->intval = !!(input & AXP20X_PWR_STATUS_AC_AVAILABLE); + break; + default: + return -EINVAL; + } + + return 0; +} + +static enum power_supply_property axp20x_ac_power_properties[] = { + POWER_SUPPLY_PROP_PRESENT, + POWER_SUPPLY_PROP_ONLINE, + POWER_SUPPLY_PROP_VOLTAGE_NOW, + POWER_SUPPLY_PROP_CURRENT_NOW, +}; + +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 irqreturn_t axp20x_irq_ac_handler(int irq, void *devid) +{ + struct axp20x_ac_power *power = devid; + + power_supply_changed(power->supply); + + return IRQ_HANDLED; +} + +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; + static const char * const irq_names[] = { "ACIN_PLUGIN", + "ACIN_REMOVAL", "ACIN_OVER_V" }; + int i, irq, r; + + power = devm_kzalloc(&pdev->dev, sizeof(*power), GFP_KERNEL); + if (!power) + return -ENOMEM; + + power->regmap = axp20x->regmap; + + /* Enable ac voltage and current measurement */ + r = regmap_update_bits(power->regmap, AXP20X_ADC_EN1, + AXP20X_ADC_EN1_ACIN_CURR | AXP20X_ADC_EN1_ACIN_VOLT, + AXP20X_ADC_EN1_ACIN_CURR | AXP20X_ADC_EN1_ACIN_VOLT); + if (r) + return r; + + psy_cfg.of_node = pdev->dev.of_node; + psy_cfg.drv_data = power; + + power->supply = devm_power_supply_register(&pdev->dev, + &axp20x_ac_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); + r = devm_request_any_context_irq(&pdev->dev, irq, + axp20x_irq_ac_handler, 0, DRVNAME, power); + if (r < 0) + dev_warn(&pdev->dev, "Error requesting %s IRQ: %d\n", + irq_names[i], r); + } + + return 0; +} + +static const struct of_device_id axp20x_ac_power_match[] = { + { .compatible = "x-powers,axp202-ac-power-supply" }, + { } +}; +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("Bruno Prémont <bonbons@xxxxxxxxxxxxxxxxx>"); +MODULE_DESCRIPTION("AXP20x PMIC AC power supply status driver"); +MODULE_LICENSE("GPL"); -- 2.8.2 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
