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@xxxxxxxxxxxxxxxxx> Acked-by: Lee Jones <lee.jones@xxxxxxxxxx> Signed-off-by: Bruno Prémont <bonbons@xxxxxxxxxxxxxxxxx> Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx> --- Changes in v2: -Split out the dt-bindings documentation into a separate patch -Renamed axp20x_read_16bit to axp20x_read_variable_width -Use better local variable names inside axp20x_read_variable_width Changes in v3: -Add Bruno's S-o-b Changes in v4: -Check that parent drv data is not NULL -Replace "r" local variable with a "ret" variable --- drivers/power/Kconfig | 7 ++ drivers/power/Makefile | 1 + drivers/power/axp20x_usb_power.c | 248 +++++++++++++++++++++++++++++++++++++++ include/linux/mfd/axp20x.h | 24 ++++ 4 files changed, 280 insertions(+) create mode 100644 drivers/power/axp20x_usb_power.c diff --git a/drivers/power/Kconfig b/drivers/power/Kconfig index f8758d6..914167e 100644 --- a/drivers/power/Kconfig +++ b/drivers/power/Kconfig @@ -472,6 +472,13 @@ config CHARGER_RT9455 help Say Y to enable support for Richtek RT9455 battery charger. +config AXP20X_POWER + tristate "AXP20x power supply driver" + depends on MFD_AXP20X + help + This driver provides support for the power supply features of + AXP20x PMIC. + source "drivers/power/reset/Kconfig" endif # POWER_SUPPLY diff --git a/drivers/power/Makefile b/drivers/power/Makefile index 5752ce8..fb4413e 100644 --- a/drivers/power/Makefile +++ b/drivers/power/Makefile @@ -9,6 +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-$(CONFIG_MAX8925_POWER) += max8925_power.o obj-$(CONFIG_WM831X_BACKUP) += wm831x_backup.o obj-$(CONFIG_WM831X_POWER) += wm831x_power.o diff --git a/drivers/power/axp20x_usb_power.c b/drivers/power/axp20x_usb_power.c new file mode 100644 index 0000000..421a90b --- /dev/null +++ b/drivers/power/axp20x_usb_power.c @@ -0,0 +1,248 @@ +/* + * AXP20x PMIC USB power supply status driver + * + * Copyright (C) 2015 Hans de Goede <hdegoede@xxxxxxxxxx> + * Copyright (C) 2014 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/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@xxxxxxxxxx>"); +MODULE_DESCRIPTION("AXP20x PMIC USB power supply status driver"); +MODULE_LICENSE("GPL"); diff --git a/include/linux/mfd/axp20x.h b/include/linux/mfd/axp20x.h index cc8ad1e..b24c771 100644 --- a/include/linux/mfd/axp20x.h +++ b/include/linux/mfd/axp20x.h @@ -11,6 +11,8 @@ #ifndef __LINUX_MFD_AXP20X_H #define __LINUX_MFD_AXP20X_H +#include <linux/regmap.h> + enum { AXP152_ID = 0, AXP202_ID, @@ -438,4 +440,26 @@ struct axp288_extcon_pdata { struct gpio_desc *gpio_mux_cntl; }; +/* generic helper function for reading 9-16 bit wide regs */ +static inline int axp20x_read_variable_width(struct regmap *regmap, + unsigned int reg, unsigned int width) +{ + unsigned int reg_val, result; + int err; + + err = regmap_read(regmap, reg, ®_val); + if (err) + return err; + + result = reg_val << (width - 8); + + err = regmap_read(regmap, reg + 1, ®_val); + if (err) + return err; + + result |= reg_val; + + return result; +} + #endif /* __LINUX_MFD_AXP20X_H */ -- 2.4.3 -- 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