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499 lines
13 KiB
499 lines
13 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* extcon-axp288.c - X-Power AXP288 PMIC extcon cable detection driver |
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* |
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* Copyright (c) 2017-2018 Hans de Goede <[email protected]> |
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* Copyright (C) 2015 Intel Corporation |
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* Author: Ramakrishna Pallala <[email protected]> |
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*/ |
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#include <linux/acpi.h> |
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#include <linux/module.h> |
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#include <linux/kernel.h> |
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#include <linux/io.h> |
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#include <linux/slab.h> |
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#include <linux/interrupt.h> |
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#include <linux/platform_device.h> |
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#include <linux/property.h> |
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#include <linux/notifier.h> |
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#include <linux/extcon-provider.h> |
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#include <linux/regmap.h> |
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#include <linux/mfd/axp20x.h> |
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#include <linux/usb/role.h> |
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#include <linux/workqueue.h> |
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#include <asm/cpu_device_id.h> |
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#include <asm/intel-family.h> |
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/* Power source status register */ |
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#define PS_STAT_VBUS_TRIGGER BIT(0) |
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#define PS_STAT_BAT_CHRG_DIR BIT(2) |
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#define PS_STAT_VBUS_ABOVE_VHOLD BIT(3) |
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#define PS_STAT_VBUS_VALID BIT(4) |
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#define PS_STAT_VBUS_PRESENT BIT(5) |
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/* BC module global register */ |
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#define BC_GLOBAL_RUN BIT(0) |
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#define BC_GLOBAL_DET_STAT BIT(2) |
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#define BC_GLOBAL_DBP_TOUT BIT(3) |
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#define BC_GLOBAL_VLGC_COM_SEL BIT(4) |
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#define BC_GLOBAL_DCD_TOUT_MASK (BIT(6)|BIT(5)) |
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#define BC_GLOBAL_DCD_TOUT_300MS 0 |
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#define BC_GLOBAL_DCD_TOUT_100MS 1 |
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#define BC_GLOBAL_DCD_TOUT_500MS 2 |
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#define BC_GLOBAL_DCD_TOUT_900MS 3 |
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#define BC_GLOBAL_DCD_DET_SEL BIT(7) |
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/* BC module vbus control and status register */ |
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#define VBUS_CNTL_DPDM_PD_EN BIT(4) |
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#define VBUS_CNTL_DPDM_FD_EN BIT(5) |
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#define VBUS_CNTL_FIRST_PO_STAT BIT(6) |
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/* BC USB status register */ |
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#define USB_STAT_BUS_STAT_MASK (BIT(3)|BIT(2)|BIT(1)|BIT(0)) |
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#define USB_STAT_BUS_STAT_SHIFT 0 |
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#define USB_STAT_BUS_STAT_ATHD 0 |
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#define USB_STAT_BUS_STAT_CONN 1 |
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#define USB_STAT_BUS_STAT_SUSP 2 |
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#define USB_STAT_BUS_STAT_CONF 3 |
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#define USB_STAT_USB_SS_MODE BIT(4) |
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#define USB_STAT_DEAD_BAT_DET BIT(6) |
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#define USB_STAT_DBP_UNCFG BIT(7) |
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/* BC detect status register */ |
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#define DET_STAT_MASK (BIT(7)|BIT(6)|BIT(5)) |
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#define DET_STAT_SHIFT 5 |
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#define DET_STAT_SDP 1 |
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#define DET_STAT_CDP 2 |
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#define DET_STAT_DCP 3 |
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enum axp288_extcon_reg { |
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AXP288_PS_STAT_REG = 0x00, |
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AXP288_PS_BOOT_REASON_REG = 0x02, |
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AXP288_BC_GLOBAL_REG = 0x2c, |
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AXP288_BC_VBUS_CNTL_REG = 0x2d, |
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AXP288_BC_USB_STAT_REG = 0x2e, |
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AXP288_BC_DET_STAT_REG = 0x2f, |
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}; |
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enum axp288_extcon_irq { |
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VBUS_FALLING_IRQ = 0, |
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VBUS_RISING_IRQ, |
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MV_CHNG_IRQ, |
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BC_USB_CHNG_IRQ, |
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EXTCON_IRQ_END, |
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}; |
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static const unsigned int axp288_extcon_cables[] = { |
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EXTCON_CHG_USB_SDP, |
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EXTCON_CHG_USB_CDP, |
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EXTCON_CHG_USB_DCP, |
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EXTCON_USB, |
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EXTCON_NONE, |
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}; |
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struct axp288_extcon_info { |
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struct device *dev; |
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struct regmap *regmap; |
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struct regmap_irq_chip_data *regmap_irqc; |
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struct usb_role_switch *role_sw; |
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struct work_struct role_work; |
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int irq[EXTCON_IRQ_END]; |
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struct extcon_dev *edev; |
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struct extcon_dev *id_extcon; |
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struct notifier_block id_nb; |
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unsigned int previous_cable; |
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bool vbus_attach; |
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}; |
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static const struct x86_cpu_id cherry_trail_cpu_ids[] = { |
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X86_MATCH_INTEL_FAM6_MODEL(ATOM_AIRMONT, NULL), |
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{} |
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}; |
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/* Power up/down reason string array */ |
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static const char * const axp288_pwr_up_down_info[] = { |
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"Last wake caused by user pressing the power button", |
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"Last wake caused by a charger insertion", |
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"Last wake caused by a battery insertion", |
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"Last wake caused by SOC initiated global reset", |
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"Last wake caused by cold reset", |
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"Last shutdown caused by PMIC UVLO threshold", |
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"Last shutdown caused by SOC initiated cold off", |
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"Last shutdown caused by user pressing the power button", |
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}; |
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/* |
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* Decode and log the given "reset source indicator" (rsi) |
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* register and then clear it. |
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*/ |
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static void axp288_extcon_log_rsi(struct axp288_extcon_info *info) |
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{ |
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unsigned int val, i, clear_mask = 0; |
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unsigned long bits; |
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int ret; |
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ret = regmap_read(info->regmap, AXP288_PS_BOOT_REASON_REG, &val); |
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if (ret < 0) { |
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dev_err(info->dev, "failed to read reset source indicator\n"); |
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return; |
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} |
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bits = val & GENMASK(ARRAY_SIZE(axp288_pwr_up_down_info) - 1, 0); |
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for_each_set_bit(i, &bits, ARRAY_SIZE(axp288_pwr_up_down_info)) |
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dev_dbg(info->dev, "%s\n", axp288_pwr_up_down_info[i]); |
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clear_mask = bits; |
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/* Clear the register value for next reboot (write 1 to clear bit) */ |
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regmap_write(info->regmap, AXP288_PS_BOOT_REASON_REG, clear_mask); |
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} |
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/* |
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* The below code to control the USB role-switch on devices with an AXP288 |
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* may seem out of place, but there are 2 reasons why this is the best place |
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* to control the USB role-switch on such devices: |
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* 1) On many devices the USB role is controlled by AML code, but the AML code |
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* only switches between the host and none roles, because of Windows not |
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* really using device mode. To make device mode work we need to toggle |
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* between the none/device roles based on Vbus presence, and this driver |
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* gets interrupts on Vbus insertion / removal. |
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* 2) In order for our BC1.2 charger detection to work properly the role |
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* mux must be properly set to device mode before we do the detection. |
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*/ |
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/* Returns the id-pin value, note pulled low / false == host-mode */ |
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static bool axp288_get_id_pin(struct axp288_extcon_info *info) |
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{ |
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enum usb_role role; |
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if (info->id_extcon) |
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return extcon_get_state(info->id_extcon, EXTCON_USB_HOST) <= 0; |
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/* We cannot access the id-pin, see what mode the AML code has set */ |
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role = usb_role_switch_get_role(info->role_sw); |
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return role != USB_ROLE_HOST; |
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} |
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static void axp288_usb_role_work(struct work_struct *work) |
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{ |
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struct axp288_extcon_info *info = |
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container_of(work, struct axp288_extcon_info, role_work); |
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enum usb_role role; |
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bool id_pin; |
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int ret; |
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id_pin = axp288_get_id_pin(info); |
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if (!id_pin) |
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role = USB_ROLE_HOST; |
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else if (info->vbus_attach) |
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role = USB_ROLE_DEVICE; |
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else |
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role = USB_ROLE_NONE; |
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ret = usb_role_switch_set_role(info->role_sw, role); |
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if (ret) |
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dev_err(info->dev, "failed to set role: %d\n", ret); |
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} |
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static bool axp288_get_vbus_attach(struct axp288_extcon_info *info) |
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{ |
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int ret, pwr_stat; |
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ret = regmap_read(info->regmap, AXP288_PS_STAT_REG, &pwr_stat); |
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if (ret < 0) { |
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dev_err(info->dev, "failed to read vbus status\n"); |
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return false; |
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} |
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return !!(pwr_stat & PS_STAT_VBUS_VALID); |
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} |
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static int axp288_handle_chrg_det_event(struct axp288_extcon_info *info) |
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{ |
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int ret, stat, cfg; |
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u8 chrg_type; |
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unsigned int cable = info->previous_cable; |
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bool vbus_attach = false; |
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vbus_attach = axp288_get_vbus_attach(info); |
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if (!vbus_attach) |
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goto no_vbus; |
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/* Check charger detection completion status */ |
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ret = regmap_read(info->regmap, AXP288_BC_GLOBAL_REG, &cfg); |
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if (ret < 0) |
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goto dev_det_ret; |
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if (cfg & BC_GLOBAL_DET_STAT) { |
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dev_dbg(info->dev, "can't complete the charger detection\n"); |
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goto dev_det_ret; |
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} |
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ret = regmap_read(info->regmap, AXP288_BC_DET_STAT_REG, &stat); |
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if (ret < 0) |
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goto dev_det_ret; |
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chrg_type = (stat & DET_STAT_MASK) >> DET_STAT_SHIFT; |
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switch (chrg_type) { |
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case DET_STAT_SDP: |
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dev_dbg(info->dev, "sdp cable is connected\n"); |
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cable = EXTCON_CHG_USB_SDP; |
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break; |
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case DET_STAT_CDP: |
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dev_dbg(info->dev, "cdp cable is connected\n"); |
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cable = EXTCON_CHG_USB_CDP; |
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break; |
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case DET_STAT_DCP: |
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dev_dbg(info->dev, "dcp cable is connected\n"); |
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cable = EXTCON_CHG_USB_DCP; |
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break; |
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default: |
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dev_warn(info->dev, "unknown (reserved) bc detect result\n"); |
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cable = EXTCON_CHG_USB_SDP; |
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} |
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no_vbus: |
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extcon_set_state_sync(info->edev, info->previous_cable, false); |
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if (info->previous_cable == EXTCON_CHG_USB_SDP) |
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extcon_set_state_sync(info->edev, EXTCON_USB, false); |
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if (vbus_attach) { |
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extcon_set_state_sync(info->edev, cable, vbus_attach); |
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if (cable == EXTCON_CHG_USB_SDP) |
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extcon_set_state_sync(info->edev, EXTCON_USB, |
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vbus_attach); |
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info->previous_cable = cable; |
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} |
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if (info->role_sw && info->vbus_attach != vbus_attach) { |
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info->vbus_attach = vbus_attach; |
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/* Setting the role can take a while */ |
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queue_work(system_long_wq, &info->role_work); |
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} |
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return 0; |
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dev_det_ret: |
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if (ret < 0) |
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dev_err(info->dev, "failed to detect BC Mod\n"); |
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return ret; |
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} |
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static int axp288_extcon_id_evt(struct notifier_block *nb, |
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unsigned long event, void *param) |
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{ |
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struct axp288_extcon_info *info = |
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container_of(nb, struct axp288_extcon_info, id_nb); |
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/* We may not sleep and setting the role can take a while */ |
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queue_work(system_long_wq, &info->role_work); |
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return NOTIFY_OK; |
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} |
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static irqreturn_t axp288_extcon_isr(int irq, void *data) |
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{ |
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struct axp288_extcon_info *info = data; |
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int ret; |
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ret = axp288_handle_chrg_det_event(info); |
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if (ret < 0) |
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dev_err(info->dev, "failed to handle the interrupt\n"); |
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return IRQ_HANDLED; |
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} |
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static void axp288_extcon_enable(struct axp288_extcon_info *info) |
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{ |
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regmap_update_bits(info->regmap, AXP288_BC_GLOBAL_REG, |
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BC_GLOBAL_RUN, 0); |
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/* Enable the charger detection logic */ |
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regmap_update_bits(info->regmap, AXP288_BC_GLOBAL_REG, |
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BC_GLOBAL_RUN, BC_GLOBAL_RUN); |
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} |
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static void axp288_put_role_sw(void *data) |
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{ |
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struct axp288_extcon_info *info = data; |
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cancel_work_sync(&info->role_work); |
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usb_role_switch_put(info->role_sw); |
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} |
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static int axp288_extcon_find_role_sw(struct axp288_extcon_info *info) |
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{ |
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const struct software_node *swnode; |
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struct fwnode_handle *fwnode; |
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if (!x86_match_cpu(cherry_trail_cpu_ids)) |
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return 0; |
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swnode = software_node_find_by_name(NULL, "intel-xhci-usb-sw"); |
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if (!swnode) |
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return -EPROBE_DEFER; |
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fwnode = software_node_fwnode(swnode); |
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info->role_sw = usb_role_switch_find_by_fwnode(fwnode); |
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fwnode_handle_put(fwnode); |
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return info->role_sw ? 0 : -EPROBE_DEFER; |
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} |
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static int axp288_extcon_probe(struct platform_device *pdev) |
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{ |
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struct axp288_extcon_info *info; |
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struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent); |
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struct device *dev = &pdev->dev; |
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struct acpi_device *adev; |
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int ret, i, pirq; |
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info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL); |
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if (!info) |
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return -ENOMEM; |
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info->dev = &pdev->dev; |
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info->regmap = axp20x->regmap; |
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info->regmap_irqc = axp20x->regmap_irqc; |
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info->previous_cable = EXTCON_NONE; |
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INIT_WORK(&info->role_work, axp288_usb_role_work); |
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info->id_nb.notifier_call = axp288_extcon_id_evt; |
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platform_set_drvdata(pdev, info); |
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ret = axp288_extcon_find_role_sw(info); |
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if (ret) |
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return ret; |
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if (info->role_sw) { |
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ret = devm_add_action_or_reset(dev, axp288_put_role_sw, info); |
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if (ret) |
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return ret; |
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adev = acpi_dev_get_first_match_dev("INT3496", NULL, -1); |
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if (adev) { |
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info->id_extcon = extcon_get_extcon_dev(acpi_dev_name(adev)); |
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put_device(&adev->dev); |
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if (!info->id_extcon) |
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return -EPROBE_DEFER; |
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dev_info(dev, "controlling USB role\n"); |
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} else { |
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dev_info(dev, "controlling USB role based on Vbus presence\n"); |
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} |
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} |
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info->vbus_attach = axp288_get_vbus_attach(info); |
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axp288_extcon_log_rsi(info); |
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/* Initialize extcon device */ |
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info->edev = devm_extcon_dev_allocate(&pdev->dev, |
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axp288_extcon_cables); |
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if (IS_ERR(info->edev)) { |
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dev_err(&pdev->dev, "failed to allocate memory for extcon\n"); |
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return PTR_ERR(info->edev); |
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} |
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/* Register extcon device */ |
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ret = devm_extcon_dev_register(&pdev->dev, info->edev); |
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if (ret) { |
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dev_err(&pdev->dev, "failed to register extcon device\n"); |
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return ret; |
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} |
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for (i = 0; i < EXTCON_IRQ_END; i++) { |
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pirq = platform_get_irq(pdev, i); |
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if (pirq < 0) |
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return pirq; |
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info->irq[i] = regmap_irq_get_virq(info->regmap_irqc, pirq); |
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if (info->irq[i] < 0) { |
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dev_err(&pdev->dev, |
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"failed to get virtual interrupt=%d\n", pirq); |
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ret = info->irq[i]; |
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return ret; |
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} |
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ret = devm_request_threaded_irq(&pdev->dev, info->irq[i], |
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NULL, axp288_extcon_isr, |
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IRQF_ONESHOT | IRQF_NO_SUSPEND, |
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pdev->name, info); |
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if (ret) { |
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dev_err(&pdev->dev, "failed to request interrupt=%d\n", |
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info->irq[i]); |
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return ret; |
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} |
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} |
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if (info->id_extcon) { |
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ret = devm_extcon_register_notifier_all(dev, info->id_extcon, |
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&info->id_nb); |
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if (ret) |
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return ret; |
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} |
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/* Make sure the role-sw is set correctly before doing BC detection */ |
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if (info->role_sw) { |
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queue_work(system_long_wq, &info->role_work); |
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flush_work(&info->role_work); |
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} |
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/* Start charger cable type detection */ |
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axp288_extcon_enable(info); |
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device_init_wakeup(dev, true); |
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platform_set_drvdata(pdev, info); |
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return 0; |
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} |
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static int __maybe_unused axp288_extcon_suspend(struct device *dev) |
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{ |
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struct axp288_extcon_info *info = dev_get_drvdata(dev); |
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if (device_may_wakeup(dev)) |
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enable_irq_wake(info->irq[VBUS_RISING_IRQ]); |
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return 0; |
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} |
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static int __maybe_unused axp288_extcon_resume(struct device *dev) |
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{ |
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struct axp288_extcon_info *info = dev_get_drvdata(dev); |
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/* |
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* Wakeup when a charger is connected to do charger-type |
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* connection and generate an extcon event which makes the |
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* axp288 charger driver set the input current limit. |
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*/ |
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if (device_may_wakeup(dev)) |
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disable_irq_wake(info->irq[VBUS_RISING_IRQ]); |
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return 0; |
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} |
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static SIMPLE_DEV_PM_OPS(axp288_extcon_pm_ops, axp288_extcon_suspend, |
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axp288_extcon_resume); |
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static const struct platform_device_id axp288_extcon_table[] = { |
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{ .name = "axp288_extcon" }, |
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{}, |
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}; |
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MODULE_DEVICE_TABLE(platform, axp288_extcon_table); |
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static struct platform_driver axp288_extcon_driver = { |
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.probe = axp288_extcon_probe, |
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.id_table = axp288_extcon_table, |
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.driver = { |
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.name = "axp288_extcon", |
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.pm = &axp288_extcon_pm_ops, |
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}, |
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}; |
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module_platform_driver(axp288_extcon_driver); |
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MODULE_AUTHOR("Ramakrishna Pallala <[email protected]>"); |
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MODULE_AUTHOR("Hans de Goede <[email protected]>"); |
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MODULE_DESCRIPTION("X-Powers AXP288 extcon driver"); |
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MODULE_LICENSE("GPL v2");
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