| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * 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> |
| */ |
| |
| #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", |
| }; |
| |
| /* |
| * 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) |
| { |
| unsigned int val, i, clear_mask = 0; |
| unsigned long bits; |
| int ret; |
| |
| ret = regmap_read(info->regmap, AXP288_PS_BOOT_REASON_REG, &val); |
| if (ret < 0) { |
| dev_err(info->dev, "failed to read reset source indicator\n"); |
| return; |
| } |
| |
| bits = val & GENMASK(ARRAY_SIZE(axp288_pwr_up_down_info) - 1, 0); |
| for_each_set_bit(i, &bits, ARRAY_SIZE(axp288_pwr_up_down_info)) |
| dev_dbg(info->dev, "%s\n", axp288_pwr_up_down_info[i]); |
| clear_mask = bits; |
| |
| /* 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_find_role_sw(struct axp288_extcon_info *info) |
| { |
| const struct software_node *swnode; |
| struct fwnode_handle *fwnode; |
| |
| if (!x86_match_cpu(cherry_trail_cpu_ids)) |
| return 0; |
| |
| swnode = software_node_find_by_name(NULL, "intel-xhci-usb-sw"); |
| if (!swnode) |
| return -EPROBE_DEFER; |
| |
| fwnode = software_node_fwnode(swnode); |
| info->role_sw = usb_role_switch_find_by_fwnode(fwnode); |
| fwnode_handle_put(fwnode); |
| |
| return info->role_sw ? 0 : -EPROBE_DEFER; |
| } |
| |
| 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; |
| struct acpi_device *adev; |
| 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); |
| |
| ret = axp288_extcon_find_role_sw(info); |
| if (ret) |
| return ret; |
| |
| if (info->role_sw) { |
| ret = devm_add_action_or_reset(dev, axp288_put_role_sw, info); |
| if (ret) |
| return ret; |
| |
| adev = acpi_dev_get_first_match_dev("INT3496", NULL, -1); |
| if (adev) { |
| info->id_extcon = extcon_get_extcon_dev(acpi_dev_name(adev)); |
| put_device(&adev->dev); |
| 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 int __init axp288_extcon_init(void) |
| { |
| return platform_driver_register(&axp288_extcon_driver); |
| } |
| module_init(axp288_extcon_init); |
| |
| static void __exit axp288_extcon_exit(void) |
| { |
| 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"); |