v4.19.13 snapshot.
diff --git a/drivers/extcon/extcon-axp288.c b/drivers/extcon/extcon-axp288.c
new file mode 100644
index 0000000..a983708
--- /dev/null
+++ b/drivers/extcon/extcon-axp288.c
@@ -0,0 +1,475 @@
+/*
+ * extcon-axp288.c - X-Power AXP288 PMIC extcon cable detection driver
+ *
+ * Copyright (c) 2017-2018 Hans de Goede <hdegoede@redhat.com>
+ * Copyright (C) 2015 Intel Corporation
+ * Author: Ramakrishna Pallala <ramakrishna.pallala@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/acpi.h>
+#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/notifier.h>
+#include <linux/extcon-provider.h>
+#include <linux/regmap.h>
+#include <linux/mfd/axp20x.h>
+#include <linux/usb/role.h>
+#include <linux/workqueue.h>
+
+#include <asm/cpu_device_id.h>
+#include <asm/intel-family.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
+
+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,
+};
+
+enum axp288_extcon_irq {
+ VBUS_FALLING_IRQ = 0,
+ VBUS_RISING_IRQ,
+ MV_CHNG_IRQ,
+ BC_USB_CHNG_IRQ,
+ EXTCON_IRQ_END,
+};
+
+static const unsigned int axp288_extcon_cables[] = {
+ EXTCON_CHG_USB_SDP,
+ EXTCON_CHG_USB_CDP,
+ EXTCON_CHG_USB_DCP,
+ EXTCON_USB,
+ EXTCON_NONE,
+};
+
+struct axp288_extcon_info {
+ struct device *dev;
+ struct regmap *regmap;
+ struct regmap_irq_chip_data *regmap_irqc;
+ struct usb_role_switch *role_sw;
+ struct work_struct role_work;
+ int irq[EXTCON_IRQ_END];
+ struct extcon_dev *edev;
+ struct extcon_dev *id_extcon;
+ struct notifier_block id_nb;
+ unsigned int previous_cable;
+ bool vbus_attach;
+};
+
+static const struct x86_cpu_id cherry_trail_cpu_ids[] = {
+ { X86_VENDOR_INTEL, 6, INTEL_FAM6_ATOM_AIRMONT, X86_FEATURE_ANY },
+ {}
+};
+
+/* Power up/down reason string array */
+static const char * const 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)
+{
+ const char * const *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);
+}
+
+/*
+ * The below code to control the USB role-switch on devices with an AXP288
+ * may seem out of place, but there are 2 reasons why this is the best place
+ * to control the USB role-switch on such devices:
+ * 1) On many devices the USB role is controlled by AML code, but the AML code
+ * only switches between the host and none roles, because of Windows not
+ * really using device mode. To make device mode work we need to toggle
+ * between the none/device roles based on Vbus presence, and this driver
+ * gets interrupts on Vbus insertion / removal.
+ * 2) In order for our BC1.2 charger detection to work properly the role
+ * mux must be properly set to device mode before we do the detection.
+ */
+
+/* Returns the id-pin value, note pulled low / false == host-mode */
+static bool axp288_get_id_pin(struct axp288_extcon_info *info)
+{
+ enum usb_role role;
+
+ if (info->id_extcon)
+ return extcon_get_state(info->id_extcon, EXTCON_USB_HOST) <= 0;
+
+ /* We cannot access the id-pin, see what mode the AML code has set */
+ role = usb_role_switch_get_role(info->role_sw);
+ return role != USB_ROLE_HOST;
+}
+
+static void axp288_usb_role_work(struct work_struct *work)
+{
+ struct axp288_extcon_info *info =
+ container_of(work, struct axp288_extcon_info, role_work);
+ enum usb_role role;
+ bool id_pin;
+ int ret;
+
+ id_pin = axp288_get_id_pin(info);
+ if (!id_pin)
+ role = USB_ROLE_HOST;
+ else if (info->vbus_attach)
+ role = USB_ROLE_DEVICE;
+ else
+ role = USB_ROLE_NONE;
+
+ ret = usb_role_switch_set_role(info->role_sw, role);
+ if (ret)
+ dev_err(info->dev, "failed to set role: %d\n", ret);
+}
+
+static bool axp288_get_vbus_attach(struct axp288_extcon_info *info)
+{
+ int ret, pwr_stat;
+
+ 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 false;
+ }
+
+ return !!(pwr_stat & PS_STAT_VBUS_VALID);
+}
+
+static int axp288_handle_chrg_det_event(struct axp288_extcon_info *info)
+{
+ int ret, stat, cfg;
+ u8 chrg_type;
+ unsigned int cable = info->previous_cable;
+ bool vbus_attach = false;
+
+ vbus_attach = axp288_get_vbus_attach(info);
+ if (!vbus_attach)
+ goto no_vbus;
+
+ /* 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;
+
+ chrg_type = (stat & DET_STAT_MASK) >> DET_STAT_SHIFT;
+
+ switch (chrg_type) {
+ case DET_STAT_SDP:
+ dev_dbg(info->dev, "sdp cable is connected\n");
+ cable = EXTCON_CHG_USB_SDP;
+ break;
+ case DET_STAT_CDP:
+ dev_dbg(info->dev, "cdp cable is connected\n");
+ cable = EXTCON_CHG_USB_CDP;
+ break;
+ case DET_STAT_DCP:
+ dev_dbg(info->dev, "dcp cable is connected\n");
+ cable = EXTCON_CHG_USB_DCP;
+ break;
+ default:
+ dev_warn(info->dev, "unknown (reserved) bc detect result\n");
+ cable = EXTCON_CHG_USB_SDP;
+ }
+
+no_vbus:
+ extcon_set_state_sync(info->edev, info->previous_cable, false);
+ if (info->previous_cable == EXTCON_CHG_USB_SDP)
+ extcon_set_state_sync(info->edev, EXTCON_USB, false);
+
+ if (vbus_attach) {
+ extcon_set_state_sync(info->edev, cable, vbus_attach);
+ if (cable == EXTCON_CHG_USB_SDP)
+ extcon_set_state_sync(info->edev, EXTCON_USB,
+ vbus_attach);
+
+ info->previous_cable = cable;
+ }
+
+ if (info->role_sw && info->vbus_attach != vbus_attach) {
+ info->vbus_attach = vbus_attach;
+ /* Setting the role can take a while */
+ queue_work(system_long_wq, &info->role_work);
+ }
+
+ return 0;
+
+dev_det_ret:
+ if (ret < 0)
+ dev_err(info->dev, "failed to detect BC Mod\n");
+
+ return ret;
+}
+
+static int axp288_extcon_id_evt(struct notifier_block *nb,
+ unsigned long event, void *param)
+{
+ struct axp288_extcon_info *info =
+ container_of(nb, struct axp288_extcon_info, id_nb);
+
+ /* We may not sleep and setting the role can take a while */
+ queue_work(system_long_wq, &info->role_work);
+
+ return NOTIFY_OK;
+}
+
+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, "failed to handle the interrupt\n");
+
+ return IRQ_HANDLED;
+}
+
+static void axp288_extcon_enable(struct axp288_extcon_info *info)
+{
+ regmap_update_bits(info->regmap, AXP288_BC_GLOBAL_REG,
+ BC_GLOBAL_RUN, 0);
+ /* Enable the charger detection logic */
+ regmap_update_bits(info->regmap, AXP288_BC_GLOBAL_REG,
+ BC_GLOBAL_RUN, BC_GLOBAL_RUN);
+}
+
+static void axp288_put_role_sw(void *data)
+{
+ struct axp288_extcon_info *info = data;
+
+ cancel_work_sync(&info->role_work);
+ usb_role_switch_put(info->role_sw);
+}
+
+static int axp288_extcon_probe(struct platform_device *pdev)
+{
+ struct axp288_extcon_info *info;
+ struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
+ struct device *dev = &pdev->dev;
+ const char *name;
+ int ret, i, pirq;
+
+ 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->previous_cable = EXTCON_NONE;
+ INIT_WORK(&info->role_work, axp288_usb_role_work);
+ info->id_nb.notifier_call = axp288_extcon_id_evt;
+
+ platform_set_drvdata(pdev, info);
+
+ info->role_sw = usb_role_switch_get(dev);
+ if (IS_ERR(info->role_sw))
+ return PTR_ERR(info->role_sw);
+ if (info->role_sw) {
+ ret = devm_add_action_or_reset(dev, axp288_put_role_sw, info);
+ if (ret)
+ return ret;
+
+ name = acpi_dev_get_first_match_name("INT3496", NULL, -1);
+ if (name) {
+ info->id_extcon = extcon_get_extcon_dev(name);
+ if (!info->id_extcon)
+ return -EPROBE_DEFER;
+
+ dev_info(dev, "controlling USB role\n");
+ } else {
+ dev_info(dev, "controlling USB role based on Vbus presence\n");
+ }
+ }
+
+ info->vbus_attach = axp288_get_vbus_attach(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;
+ }
+
+ for (i = 0; i < EXTCON_IRQ_END; i++) {
+ pirq = platform_get_irq(pdev, i);
+ if (pirq < 0)
+ return pirq;
+
+ info->irq[i] = regmap_irq_get_virq(info->regmap_irqc, pirq);
+ if (info->irq[i] < 0) {
+ dev_err(&pdev->dev,
+ "failed to get virtual interrupt=%d\n", pirq);
+ ret = info->irq[i];
+ return ret;
+ }
+
+ 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]);
+ return ret;
+ }
+ }
+
+ if (info->id_extcon) {
+ ret = devm_extcon_register_notifier_all(dev, info->id_extcon,
+ &info->id_nb);
+ if (ret)
+ return ret;
+ }
+
+ /* Make sure the role-sw is set correctly before doing BC detection */
+ if (info->role_sw) {
+ queue_work(system_long_wq, &info->role_work);
+ flush_work(&info->role_work);
+ }
+
+ /* Start charger cable type detection */
+ axp288_extcon_enable(info);
+
+ return 0;
+}
+
+static const struct platform_device_id axp288_extcon_table[] = {
+ { .name = "axp288_extcon" },
+ {},
+};
+MODULE_DEVICE_TABLE(platform, axp288_extcon_table);
+
+static struct platform_driver axp288_extcon_driver = {
+ .probe = axp288_extcon_probe,
+ .id_table = axp288_extcon_table,
+ .driver = {
+ .name = "axp288_extcon",
+ },
+};
+
+static struct device_connection axp288_extcon_role_sw_conn = {
+ .endpoint[0] = "axp288_extcon",
+ .endpoint[1] = "intel_xhci_usb_sw-role-switch",
+ .id = "usb-role-switch",
+};
+
+static int __init axp288_extcon_init(void)
+{
+ if (x86_match_cpu(cherry_trail_cpu_ids))
+ device_connection_add(&axp288_extcon_role_sw_conn);
+
+ return platform_driver_register(&axp288_extcon_driver);
+}
+module_init(axp288_extcon_init);
+
+static void __exit axp288_extcon_exit(void)
+{
+ if (x86_match_cpu(cherry_trail_cpu_ids))
+ device_connection_remove(&axp288_extcon_role_sw_conn);
+
+ platform_driver_unregister(&axp288_extcon_driver);
+}
+module_exit(axp288_extcon_exit);
+
+MODULE_AUTHOR("Ramakrishna Pallala <ramakrishna.pallala@intel.com>");
+MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
+MODULE_DESCRIPTION("X-Powers AXP288 extcon driver");
+MODULE_LICENSE("GPL v2");