> > This patch adds the extcon support for AXP288 PMIC which has the BC1.2
> > charger detection capability. Additionally it also adds the USB mux
> > switching support b/w SOC and PMIC based on GPIO control.
> >
> > Signed-off-by: Ramakrishna Pallala <ramakrishna.pall...@intel.com>
>
> When you send next versions, the convention is for you to apply Acks that
> you've collected.
Ok..
Do you want me to resubmit the patch?
> > ---
> > drivers/extcon/Kconfig | 7 +
> > drivers/extcon/Makefile | 1 +
> > drivers/extcon/extcon-axp288.c | 386
> ++++++++++++++++++++++++++++++++++++++++
> > include/linux/mfd/axp20x.h | 5 +
> > 4 files changed, 399 insertions(+)
> > create mode 100644 drivers/extcon/extcon-axp288.c
> >
> > diff --git a/drivers/extcon/Kconfig b/drivers/extcon/Kconfig index
> > fdc0bf0..2305edc 100644
> > --- a/drivers/extcon/Kconfig
> > +++ b/drivers/extcon/Kconfig
> > @@ -28,6 +28,13 @@ config EXTCON_ARIZONA
> > with Wolfson Arizona devices. These are audio CODECs with
> > advanced audio accessory detection support.
> >
> > +config EXTCON_AXP288
> > + tristate "X-Power AXP288 EXTCON support"
> > + depends on MFD_AXP20X && USB_PHY
> > + help
> > + Say Y here to enable support for USB peripheral detection
> > + and USB MUX switching by X-Power AXP288 PMIC.
> > +
> > config EXTCON_GPIO
> > tristate "GPIO extcon support"
> > depends on GPIOLIB
> > diff --git a/drivers/extcon/Makefile b/drivers/extcon/Makefile index
> > 9204114..ba787d0 100644
> > --- a/drivers/extcon/Makefile
> > +++ b/drivers/extcon/Makefile
> > @@ -5,6 +5,7 @@
> > obj-$(CONFIG_EXTCON) += extcon.o
> > obj-$(CONFIG_EXTCON_ADC_JACK) += extcon-adc-jack.o
> > obj-$(CONFIG_EXTCON_ARIZONA) += extcon-arizona.o
> > +obj-$(CONFIG_EXTCON_AXP288) += extcon-axp288.o
> > obj-$(CONFIG_EXTCON_GPIO) += extcon-gpio.o
> > obj-$(CONFIG_EXTCON_MAX14577) += extcon-max14577.o
> > obj-$(CONFIG_EXTCON_MAX77693) += extcon-max77693.o
> > diff --git a/drivers/extcon/extcon-axp288.c
> > b/drivers/extcon/extcon-axp288.c new file mode 100644 index
> > 0000000..ea61bf2
> > --- /dev/null
> > +++ b/drivers/extcon/extcon-axp288.c
> > @@ -0,0 +1,386 @@
> > +/*
> > + * extcon-axp288.c - X-Power AXP288 PMIC extcon cable detection
> > +driver
> > + *
> > + * Copyright (C) 2015 Intel Corporation
> > + * Author: Ramakrishna Pallala <ramakrishna.pall...@intel.com>
> > + *
> > + * This program is free software; you can redistribute it and/or
> > +modify
> > + * it under the terms of the GNU General Public License version 2 as
> > + * published by the Free Software Foundation.
> > + *
> > + * This program is distributed in the hope that it will be useful,
> > + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> > + * GNU General Public License for more details.
> > + */
> > +
> > +#include <linux/module.h>
> > +#include <linux/kernel.h>
> > +#include <linux/io.h>
> > +#include <linux/slab.h>
> > +#include <linux/interrupt.h>
> > +#include <linux/platform_device.h>
> > +#include <linux/property.h>
> > +#include <linux/usb/phy.h>
> > +#include <linux/notifier.h>
> > +#include <linux/extcon.h>
> > +#include <linux/regmap.h>
> > +#include <linux/gpio.h>
> > +#include <linux/gpio/consumer.h>
> > +#include <linux/mfd/axp20x.h>
> > +
> > +/* Power source status register */
> > +#define PS_STAT_VBUS_TRIGGER BIT(0)
> > +#define PS_STAT_BAT_CHRG_DIR BIT(2)
> > +#define PS_STAT_VBUS_ABOVE_VHOLD BIT(3)
> > +#define PS_STAT_VBUS_VALID BIT(4)
> > +#define PS_STAT_VBUS_PRESENT BIT(5)
> > +
> > +/* BC module global register */
> > +#define BC_GLOBAL_RUN BIT(0)
> > +#define BC_GLOBAL_DET_STAT BIT(2)
> > +#define BC_GLOBAL_DBP_TOUT BIT(3)
> > +#define BC_GLOBAL_VLGC_COM_SEL BIT(4)
> > +#define BC_GLOBAL_DCD_TOUT_MASK (BIT(6)|BIT(5))
> > +#define BC_GLOBAL_DCD_TOUT_300MS 0
> > +#define BC_GLOBAL_DCD_TOUT_100MS 1
> > +#define BC_GLOBAL_DCD_TOUT_500MS 2
> > +#define BC_GLOBAL_DCD_TOUT_900MS 3
> > +#define BC_GLOBAL_DCD_DET_SEL BIT(7)
> > +
> > +/* BC module vbus control and status register */
> > +#define VBUS_CNTL_DPDM_PD_EN BIT(4)
> > +#define VBUS_CNTL_DPDM_FD_EN BIT(5)
> > +#define VBUS_CNTL_FIRST_PO_STAT BIT(6)
> > +
> > +/* BC USB status register */
> > +#define USB_STAT_BUS_STAT_MASK (BIT(3)|BIT(2)|BIT(1)|BIT(0))
> > +#define USB_STAT_BUS_STAT_SHIFT 0
> > +#define USB_STAT_BUS_STAT_ATHD 0
> > +#define USB_STAT_BUS_STAT_CONN 1
> > +#define USB_STAT_BUS_STAT_SUSP 2
> > +#define USB_STAT_BUS_STAT_CONF 3
> > +#define USB_STAT_USB_SS_MODE BIT(4)
> > +#define USB_STAT_DEAD_BAT_DET BIT(6)
> > +#define USB_STAT_DBP_UNCFG BIT(7)
> > +
> > +/* BC detect status register */
> > +#define DET_STAT_MASK (BIT(7)|BIT(6)|BIT(5))
> > +#define DET_STAT_SHIFT 5
> > +#define DET_STAT_SDP 1
> > +#define DET_STAT_CDP 2
> > +#define DET_STAT_DCP 3
> > +
> > +/* IRQ enable-1 register */
> > +#define PWRSRC_IRQ_CFG_MASK (BIT(4)|BIT(3)|BIT(2))
> > +
> > +/* IRQ enable-6 register */
> > +#define BC12_IRQ_CFG_MASK BIT(1)
> > +
> > +#define AXP288_EXTCON_SLOW_CHARGER "SLOW-CHARGER"
> > +#define AXP288_EXTCON_DOWNSTREAM_CHARGER "CHARGE-
> DOWNSTREAM"
> > +#define AXP288_EXTCON_FAST_CHARGER "FAST-CHARGER"
> > +
> > +enum axp288_extcon_reg {
> > + AXP288_PS_STAT_REG = 0x00,
> > + AXP288_PS_BOOT_REASON_REG = 0x02,
> > + AXP288_BC_GLOBAL_REG = 0x2c,
> > + AXP288_BC_VBUS_CNTL_REG = 0x2d,
> > + AXP288_BC_USB_STAT_REG = 0x2e,
> > + AXP288_BC_DET_STAT_REG = 0x2f,
> > + AXP288_PWRSRC_IRQ_CFG_REG = 0x40,
> > + AXP288_BC12_IRQ_CFG_REG = 0x45,
> > +};
> > +
> > +enum axp288_mux_select {
> > + EXTCON_GPIO_MUX_SEL_PMIC = 0,
> > + EXTCON_GPIO_MUX_SEL_SOC,
> > +};
> > +
> > +enum axp288_extcon_irq {
> > + VBUS_FALLING_IRQ = 0,
> > + VBUS_RISING_IRQ,
> > + MV_CHNG_IRQ,
> > + BC_USB_CHNG_IRQ,
> > + EXTCON_IRQ_END,
> > +};
> > +
> > +static const char *axp288_extcon_cables[] = {
> > + AXP288_EXTCON_SLOW_CHARGER,
> > + AXP288_EXTCON_DOWNSTREAM_CHARGER,
> > + AXP288_EXTCON_FAST_CHARGER,
> > + NULL,
> > +};
> > +
> > +struct axp288_extcon_info {
> > + struct device *dev;
> > + struct regmap *regmap;
> > + struct regmap_irq_chip_data *regmap_irqc;
> > + struct axp288_extcon_pdata *pdata;
> > + int irq[EXTCON_IRQ_END];
> > + struct extcon_dev *edev;
> > + struct notifier_block extcon_nb;
> > + struct usb_phy *otg;
> > +};
> > +
> > +/* Power up/down reason string array */ static char
> > +*axp288_pwr_up_down_info[] = {
> > + "Last wake caused by user pressing the power button",
> > + "Last wake caused by a charger insertion",
> > + "Last wake caused by a battery insertion",
> > + "Last wake caused by SOC initiated global reset",
> > + "Last wake caused by cold reset",
> > + "Last shutdown caused by PMIC UVLO threshold",
> > + "Last shutdown caused by SOC initiated cold off",
> > + "Last shutdown caused by user pressing the power button",
> > + NULL,
> > +};
> > +
> > +/*
> > + * Decode and log the given "reset source indicator" (rsi)
> > + * register and then clear it.
> > + */
> > +static void axp288_extcon_log_rsi(struct axp288_extcon_info *info) {
> > + char **rsi;
> > + unsigned int val, i, clear_mask = 0;
> > + int ret;
> > +
> > + ret = regmap_read(info->regmap, AXP288_PS_BOOT_REASON_REG,
> &val);
> > + for (i = 0, rsi = axp288_pwr_up_down_info; *rsi; rsi++, i++) {
> > + if (val & BIT(i)) {
> > + dev_dbg(info->dev, "%s\n", *rsi);
> > + clear_mask |= BIT(i);
> > + }
> > + }
> > +
> > + /* Clear the register value for next reboot (write 1 to clear bit) */
> > + regmap_write(info->regmap, AXP288_PS_BOOT_REASON_REG,
> clear_mask); }
> > +
> > +static int axp288_handle_chrg_det_event(struct axp288_extcon_info
> > +*info) {
> > + static bool notify_otg, notify_charger;
> > + static char *cable;
> > + int ret, stat, cfg, pwr_stat;
> > + u8 chrg_type;
> > + bool vbus_attach = false;
> > +
> > + ret = regmap_read(info->regmap, AXP288_PS_STAT_REG, &pwr_stat);
> > + if (ret < 0) {
> > + dev_err(info->dev, "failed to read vbus status\n");
> > + return ret;
> > + }
> > +
> > + vbus_attach = (pwr_stat & PS_STAT_VBUS_PRESENT);
> > + if (!vbus_attach)
> > + goto notify_otg;
> > +
> > + /* Check charger detection completion status */
> > + ret = regmap_read(info->regmap, AXP288_BC_GLOBAL_REG, &cfg);
> > + if (ret < 0)
> > + goto dev_det_ret;
> > + if (cfg & BC_GLOBAL_DET_STAT) {
> > + dev_dbg(info->dev, "can't complete the charger detection\n");
> > + goto dev_det_ret;
> > + }
> > +
> > + ret = regmap_read(info->regmap, AXP288_BC_DET_STAT_REG, &stat);
> > + if (ret < 0)
> > + goto dev_det_ret;
> > + dev_dbg(info->dev, "status:%x, config:%x\n", stat, cfg);
> > +
> > + chrg_type = (stat & DET_STAT_MASK) >> DET_STAT_SHIFT;
> > +
> > + switch (chrg_type) {
> > + case DET_STAT_SDP:
> > + dev_dbg(info->dev, "sdp cable is connecetd\n");
> > + notify_otg = true;
> > + notify_charger = true;
> > + cable = AXP288_EXTCON_SLOW_CHARGER;
> > + break;
> > + case DET_STAT_CDP:
> > + dev_dbg(info->dev, "cdp cable is connecetd\n");
> > + notify_otg = true;
> > + notify_charger = true;
> > + cable = AXP288_EXTCON_DOWNSTREAM_CHARGER;
> > + break;
> > + case DET_STAT_DCP:
> > + dev_dbg(info->dev, "dcp cable is connecetd\n");
> > + notify_charger = true;
> > + cable = AXP288_EXTCON_FAST_CHARGER;
> > + break;
> > + default:
> > + dev_warn(info->dev,
> > + "disconnect or unknown or ID event\n");
> > + }
> > +
> > +notify_otg:
> > + if (notify_otg) {
> > + /*
> > + * If VBUS is absent Connect D+/D- lines to PMIC for BC
> > + * detection. Else connect them to SOC for USB communication.
> > + */
> > + if (info->pdata->gpio_mux_cntl)
> > + gpiod_set_value(info->pdata->gpio_mux_cntl,
> > + vbus_attach ? EXTCON_GPIO_MUX_SEL_SOC
> > + :
> EXTCON_GPIO_MUX_SEL_PMIC);
> > +
> > + atomic_notifier_call_chain(&info->otg->notifier,
> > + vbus_attach ? USB_EVENT_VBUS : USB_EVENT_NONE,
> NULL);
> > + }
> > +
> > + if (notify_charger)
> > + extcon_set_cable_state(info->edev, cable, vbus_attach);
> > +
> > + /* Clear the flags on disconnect event */
> > + if (!vbus_attach)
> > + notify_otg = notify_charger = false;
> > +
> > + return 0;
> > +
> > +dev_det_ret:
> > + if (ret < 0)
> > + dev_err(info->dev, "BC Mod detection error\n");
> > +
> > + return ret;
> > +}
> > +
> > +static irqreturn_t axp288_extcon_isr(int irq, void *data) {
> > + struct axp288_extcon_info *info = data;
> > + int ret;
> > +
> > + ret = axp288_handle_chrg_det_event(info);
> > + if (ret < 0)
> > + dev_err(info->dev, "error in PWRSRC INT handling\n");
> > +
> > + return IRQ_HANDLED;
> > +}
> > +
> > +static void axp288_extcon_enable_irq(struct axp288_extcon_info *info)
> > +{
> > + /* Unmask VBUS interrupt */
> > + regmap_write(info->regmap, AXP288_PWRSRC_IRQ_CFG_REG,
> > + PWRSRC_IRQ_CFG_MASK);
> > + regmap_update_bits(info->regmap, AXP288_BC_GLOBAL_REG,
> > + BC_GLOBAL_RUN, 0);
> > + /* Unmask the BC1.2 complete interrupts */
> > + regmap_write(info->regmap, AXP288_BC12_IRQ_CFG_REG,
> BC12_IRQ_CFG_MASK);
> > + /* Enable the charger detection logic */
> > + regmap_update_bits(info->regmap, AXP288_BC_GLOBAL_REG,
> > + BC_GLOBAL_RUN, BC_GLOBAL_RUN);
> > +}
> > +
> > +static int axp288_extcon_probe(struct platform_device *pdev) {
> > + struct axp288_extcon_info *info;
> > + struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
> > + int ret, i, pirq, gpio;
> > +
> > + info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
> > + if (!info)
> > + return -ENOMEM;
> > +
> > + info->dev = &pdev->dev;
> > + info->regmap = axp20x->regmap;
> > + info->regmap_irqc = axp20x->regmap_irqc;
> > + info->pdata = pdev->dev.platform_data;
> > +
> > + if (!info->pdata) {
> > + /* Try ACPI provided pdata via device properties */
> > + if (!device_property_present(&pdev->dev,
> > + "axp288_extcon_data\n"))
> > + dev_err(&pdev->dev, "failed to get platform data\n");
> > + return -ENODEV;
> > + }
> > + platform_set_drvdata(pdev, info);
> > +
> > + axp288_extcon_log_rsi(info);
> > +
> > + /* Initialize extcon device */
> > + info->edev = devm_extcon_dev_allocate(&pdev->dev,
> > + axp288_extcon_cables);
> > + if (IS_ERR(info->edev)) {
> > + dev_err(&pdev->dev, "failed to allocate memory for extcon\n");
> > + return PTR_ERR(info->edev);
> > + }
> > +
> > + /* Register extcon device */
> > + ret = devm_extcon_dev_register(&pdev->dev, info->edev);
> > + if (ret) {
> > + dev_err(&pdev->dev, "failed to register extcon device\n");
> > + return ret;
> > + }
> > +
> > + /* Get otg transceiver phy */
> > + info->otg = usb_get_phy(USB_PHY_TYPE_USB2);
> > + if (IS_ERR(info->otg)) {
> > + dev_warn(&pdev->dev, "failed to get otg transceiver\n");
> > + return PTR_ERR(info->otg);
> > + }
> > +
> > + /* Set up gpio control for USB Mux */
> > + if (info->pdata->gpio_mux_cntl) {
> > + gpio = desc_to_gpio(info->pdata->gpio_mux_cntl);
> > + ret = gpio_request(gpio, "USB_MUX");
> > + if (ret < 0) {
> > + dev_err(&pdev->dev,
> > + "failed to request the gpio=%d\n", gpio);
> > + goto gpio_req_failed;
> > + }
> > + gpiod_direction_output(info->pdata->gpio_mux_cntl,
> > +
> EXTCON_GPIO_MUX_SEL_PMIC);
> > + }
> > +
> > + for (i = 0; i < EXTCON_IRQ_END; i++) {
> > + pirq = platform_get_irq(pdev, i);
> > + info->irq[i] = regmap_irq_get_virq(info->regmap_irqc, pirq);
> > + if (info->irq[i] < 0) {
> > + dev_warn(&pdev->dev,
> > + "failed to get virtual interrupt=%d\n", pirq);
> > + ret = info->irq[i];
> > + goto gpio_req_failed;
> > + }
> > +
> > + ret = devm_request_threaded_irq(&pdev->dev, info->irq[i],
> > + NULL, axp288_extcon_isr,
> > + IRQF_ONESHOT | IRQF_NO_SUSPEND,
> > + pdev->name, info);
> > + if (ret) {
> > + dev_err(&pdev->dev, "failed to request
> interrupt=%d\n",
> > + info->irq[i]);
> > + goto gpio_req_failed;
> > + }
> > + }
> > +
> > + /* Enable interrupts */
> > + axp288_extcon_enable_irq(info);
> > +
> > + return 0;
> > +
> > +gpio_req_failed:
> > + usb_put_phy(info->otg);
> > + return ret;
> > +}
> > +
> > +static int axp288_extcon_remove(struct platform_device *pdev) {
> > + struct axp288_extcon_info *info = platform_get_drvdata(pdev);
> > +
> > + usb_put_phy(info->otg);
> > + return 0;
> > +}
> > +
> > +static struct platform_driver axp288_extcon_driver = {
> > + .probe = axp288_extcon_probe,
> > + .remove = axp288_extcon_remove,
> > + .driver = {
> > + .name = "axp288_extcon",
> > + },
> > +};
> > +module_platform_driver(axp288_extcon_driver);
> > +
> > +MODULE_AUTHOR("Ramakrishna Pallala <ramakrishna.pall...@intel.com>");
> > +MODULE_DESCRIPTION("X-Powers AXP288 extcon driver");
> > +MODULE_LICENSE("GPL v2");
> > diff --git a/include/linux/mfd/axp20x.h b/include/linux/mfd/axp20x.h
> > index dfabd6d..4ed8071 100644
> > --- a/include/linux/mfd/axp20x.h
> > +++ b/include/linux/mfd/axp20x.h
> > @@ -275,4 +275,9 @@ struct axp20x_fg_pdata {
> > int thermistor_curve[MAX_THERM_CURVE_SIZE][2];
> > };
> >
> > +struct axp288_extcon_pdata {
> > + /* GPIO pin control to switch D+/D- lines b/w PMIC and SOC */
> > + struct gpio_desc *gpio_mux_cntl;
> > +};
> > +
> > #endif /* __LINUX_MFD_AXP20X_H */
Thanks,
Ram
