// SPDX-License-Identifier: GPL-2.0-or-later /* * ON Semiconductor LC824206XA Micro USB Switch driver * * Copyright (c) 2024 Hans de Goede <[email protected]> * * ON Semiconductor has an "Advance Information" datasheet available * (ENA2222-D.PDF), but no full datasheet. So there is no documentation * available for the registers. * * This driver is based on the register info from the extcon-fsa9285.c driver, * from the Lollipop Android sources for the Lenovo Yoga Tablet 2 (Pro) * 830 / 1050 / 1380 models. Note despite the name this is actually a driver * for the LC824206XA not the FSA9285. The Android sources can be downloaded * from Lenovo's support page for these tablets, filename: * yoga_tab_2_osc_android_to_lollipop_201505.rar. */ #include <linux/bits.h> #include <linux/delay.h> #include <linux/device.h> #include <linux/extcon-provider.h> #include <linux/i2c.h> #include <linux/interrupt.h> #include <linux/module.h> #include <linux/power_supply.h> #include <linux/property.h> #include <linux/regulator/consumer.h> #include <linux/workqueue.h> /* * Register defines as mentioned above there is no datasheet with register * info, so this may not be 100% accurate. */ #define REG00 … #define REG00_INIT_VALUE … #define REG_STATUS … #define STATUS_OVP … #define STATUS_DATA_SHORT … #define STATUS_VBUS_PRESENT … #define STATUS_USB_ID … #define STATUS_USB_ID_GND … #define STATUS_USB_ID_ACA … #define STATUS_USB_ID_FLOAT … /* * This controls the DP/DM muxes + other switches, * meaning of individual bits is unknown. */ #define REG_SWITCH_CONTROL … #define SWITCH_STEREO_MIC … #define SWITCH_USB_HOST … #define SWITCH_DISCONNECTED … #define SWITCH_USB_DEVICE … /* 5 bits? ADC 0x10 GND, 0x1a-0x1f ACA, 0x1f float */ #define REG_ID_PIN_ADC_VALUE … /* Masks for all 3 interrupt registers */ #define INTR_ID_PIN_CHANGE … #define INTR_VBUS_CHANGE … /* Both of these get set after a continuous mode ADC conversion */ #define INTR_ID_PIN_ADC_INT1 … #define INTR_ID_PIN_ADC_INT2 … /* Charger type available in reg 0x09 */ #define INTR_CHARGER_DET_DONE … #define INTR_OVP … /* There are 7 interrupt sources, bit 6 use is unknown (OCP?) */ #define INTR_ALL … /* Unmask interrupts this driver cares about */ #define INTR_MASK … /* Active (event happened and not cleared yet) interrupts */ #define REG_INTR_STATUS … /* * Writing a 1 to a bit here clears it in INTR_STATUS. These bits do NOT * auto-reset to 0, so these must be set to 0 manually after clearing. */ #define REG_INTR_CLEAR … /* Interrupts which bit is set to 1 here will not raise the HW IRQ */ #define REG_INTR_MASK … /* ID pin ADC control, meaning of individual bits is unknown */ #define REG_ID_PIN_ADC_CTRL … #define ID_PIN_ADC_AUTO … #define ID_PIN_ADC_CONTINUOUS … #define REG_CHARGER_DET … #define CHARGER_DET_ON … #define CHARGER_DET_CDP_ON … #define CHARGER_DET_CDP_VAL … #define REG_CHARGER_TYPE … #define CHARGER_TYPE_UNKNOWN … #define CHARGER_TYPE_DCP … #define CHARGER_TYPE_SDP_OR_CDP … #define CHARGER_TYPE_QC … #define REG10 … #define REG10_INIT_VALUE … struct lc824206xa_data { … }; static const unsigned int lc824206xa_cables[] = …; /* read/write reg helpers to add error logging to smbus byte functions */ static int lc824206xa_read_reg(struct lc824206xa_data *data, u8 reg) { … } static int lc824206xa_write_reg(struct lc824206xa_data *data, u8 reg, u8 val) { … } static int lc824206xa_get_id(struct lc824206xa_data *data) { … } static void lc824206xa_set_vbus_boost(struct lc824206xa_data *data, bool enable) { … } static void lc824206xa_charger_detect(struct lc824206xa_data *data) { … } static void lc824206xa_work(struct work_struct *work) { … } static irqreturn_t lc824206xa_irq(int irq, void *_data) { … } /* * Newer charger (power_supply) drivers expect the max input current to be * provided by a parent power_supply device for the charger chip. */ static int lc824206xa_psy_get_prop(struct power_supply *psy, enum power_supply_property psp, union power_supply_propval *val) { … } static const enum power_supply_property lc824206xa_psy_props[] = …; static const struct power_supply_desc lc824206xa_psy_desc = …; static int lc824206xa_probe(struct i2c_client *client) { … } static const struct i2c_device_id lc824206xa_i2c_ids[] = …; MODULE_DEVICE_TABLE(i2c, lc824206xa_i2c_ids); static struct i2c_driver lc824206xa_driver = …; module_i2c_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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