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333 lines
8.0 KiB
333 lines
8.0 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Maxim MAX14656 / AL32 USB Charger Detector driver |
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* |
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* Copyright (C) 2014 LG Electronics, Inc |
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* Copyright (C) 2016 Alexander Kurz <[email protected]> |
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* |
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* Components from Maxim AL32 Charger detection Driver for MX50 Yoshi Board |
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* Copyright (C) Amazon Technologies Inc. All rights reserved. |
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* Manish Lachwani ([email protected]) |
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*/ |
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#include <linux/module.h> |
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#include <linux/init.h> |
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#include <linux/delay.h> |
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#include <linux/i2c.h> |
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#include <linux/interrupt.h> |
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#include <linux/slab.h> |
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#include <linux/of_device.h> |
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#include <linux/workqueue.h> |
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#include <linux/power_supply.h> |
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#define MAX14656_MANUFACTURER "Maxim Integrated" |
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#define MAX14656_NAME "max14656" |
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#define MAX14656_DEVICE_ID 0x00 |
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#define MAX14656_INTERRUPT_1 0x01 |
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#define MAX14656_INTERRUPT_2 0x02 |
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#define MAX14656_STATUS_1 0x03 |
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#define MAX14656_STATUS_2 0x04 |
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#define MAX14656_INTMASK_1 0x05 |
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#define MAX14656_INTMASK_2 0x06 |
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#define MAX14656_CONTROL_1 0x07 |
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#define MAX14656_CONTROL_2 0x08 |
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#define MAX14656_CONTROL_3 0x09 |
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#define DEVICE_VENDOR_MASK 0xf0 |
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#define DEVICE_REV_MASK 0x0f |
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#define INT_EN_REG_MASK BIT(4) |
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#define CHG_TYPE_INT_MASK BIT(0) |
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#define STATUS1_VB_VALID_MASK BIT(4) |
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#define STATUS1_CHG_TYPE_MASK 0xf |
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#define INT1_DCD_TIMEOUT_MASK BIT(7) |
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#define CONTROL1_DEFAULT 0x0d |
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#define CONTROL1_INT_EN BIT(4) |
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#define CONTROL1_INT_ACTIVE_HIGH BIT(5) |
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#define CONTROL1_EDGE BIT(7) |
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#define CONTROL2_DEFAULT 0x8e |
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#define CONTROL2_ADC_EN BIT(0) |
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#define CONTROL3_DEFAULT 0x8d |
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enum max14656_chg_type { |
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MAX14656_NO_CHARGER = 0, |
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MAX14656_SDP_CHARGER, |
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MAX14656_CDP_CHARGER, |
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MAX14656_DCP_CHARGER, |
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MAX14656_APPLE_500MA_CHARGER, |
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MAX14656_APPLE_1A_CHARGER, |
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MAX14656_APPLE_2A_CHARGER, |
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MAX14656_SPECIAL_500MA_CHARGER, |
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MAX14656_APPLE_12W, |
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MAX14656_CHARGER_LAST |
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}; |
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static const struct max14656_chg_type_props { |
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enum power_supply_type type; |
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} chg_type_props[] = { |
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{ POWER_SUPPLY_TYPE_UNKNOWN }, |
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{ POWER_SUPPLY_TYPE_USB }, |
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{ POWER_SUPPLY_TYPE_USB_CDP }, |
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{ POWER_SUPPLY_TYPE_USB_DCP }, |
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{ POWER_SUPPLY_TYPE_USB_DCP }, |
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{ POWER_SUPPLY_TYPE_USB_DCP }, |
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{ POWER_SUPPLY_TYPE_USB_DCP }, |
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{ POWER_SUPPLY_TYPE_USB_DCP }, |
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{ POWER_SUPPLY_TYPE_USB }, |
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}; |
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struct max14656_chip { |
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struct i2c_client *client; |
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struct power_supply *detect_psy; |
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struct power_supply_desc psy_desc; |
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struct delayed_work irq_work; |
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int irq; |
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int online; |
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}; |
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static int max14656_read_reg(struct i2c_client *client, int reg, u8 *val) |
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{ |
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s32 ret; |
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ret = i2c_smbus_read_byte_data(client, reg); |
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if (ret < 0) { |
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dev_err(&client->dev, |
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"i2c read fail: can't read from %02x: %d\n", |
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reg, ret); |
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return ret; |
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} |
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*val = ret; |
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return 0; |
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} |
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static int max14656_write_reg(struct i2c_client *client, int reg, u8 val) |
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{ |
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s32 ret; |
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ret = i2c_smbus_write_byte_data(client, reg, val); |
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if (ret < 0) { |
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dev_err(&client->dev, |
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"i2c write fail: can't write %02x to %02x: %d\n", |
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val, reg, ret); |
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return ret; |
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} |
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return 0; |
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} |
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static int max14656_read_block_reg(struct i2c_client *client, u8 reg, |
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u8 length, u8 *val) |
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{ |
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int ret; |
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ret = i2c_smbus_read_i2c_block_data(client, reg, length, val); |
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if (ret < 0) { |
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dev_err(&client->dev, "failed to block read reg 0x%x: %d\n", |
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reg, ret); |
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return ret; |
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} |
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return 0; |
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} |
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#define REG_TOTAL_NUM 5 |
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static void max14656_irq_worker(struct work_struct *work) |
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{ |
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struct max14656_chip *chip = |
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container_of(work, struct max14656_chip, irq_work.work); |
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u8 buf[REG_TOTAL_NUM]; |
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u8 chg_type; |
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max14656_read_block_reg(chip->client, MAX14656_DEVICE_ID, |
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REG_TOTAL_NUM, buf); |
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if ((buf[MAX14656_STATUS_1] & STATUS1_VB_VALID_MASK) && |
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(buf[MAX14656_STATUS_1] & STATUS1_CHG_TYPE_MASK)) { |
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chg_type = buf[MAX14656_STATUS_1] & STATUS1_CHG_TYPE_MASK; |
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if (chg_type < MAX14656_CHARGER_LAST) |
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chip->psy_desc.type = chg_type_props[chg_type].type; |
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else |
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chip->psy_desc.type = POWER_SUPPLY_TYPE_UNKNOWN; |
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chip->online = 1; |
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} else { |
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chip->online = 0; |
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chip->psy_desc.type = POWER_SUPPLY_TYPE_UNKNOWN; |
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} |
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power_supply_changed(chip->detect_psy); |
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} |
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static irqreturn_t max14656_irq(int irq, void *dev_id) |
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{ |
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struct max14656_chip *chip = dev_id; |
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schedule_delayed_work(&chip->irq_work, msecs_to_jiffies(100)); |
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return IRQ_HANDLED; |
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} |
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static int max14656_hw_init(struct max14656_chip *chip) |
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{ |
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uint8_t val = 0; |
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uint8_t rev; |
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struct i2c_client *client = chip->client; |
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if (max14656_read_reg(client, MAX14656_DEVICE_ID, &val)) |
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return -ENODEV; |
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if ((val & DEVICE_VENDOR_MASK) != 0x20) { |
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dev_err(&client->dev, "wrong vendor ID %d\n", |
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((val & DEVICE_VENDOR_MASK) >> 4)); |
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return -ENODEV; |
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} |
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rev = val & DEVICE_REV_MASK; |
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/* Turn on ADC_EN */ |
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if (max14656_write_reg(client, MAX14656_CONTROL_2, CONTROL2_ADC_EN)) |
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return -EINVAL; |
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/* turn on interrupts and low power mode */ |
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if (max14656_write_reg(client, MAX14656_CONTROL_1, |
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CONTROL1_DEFAULT | |
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CONTROL1_INT_EN | |
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CONTROL1_INT_ACTIVE_HIGH | |
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CONTROL1_EDGE)) |
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return -EINVAL; |
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if (max14656_write_reg(client, MAX14656_INTMASK_1, 0x3)) |
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return -EINVAL; |
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if (max14656_write_reg(client, MAX14656_INTMASK_2, 0x1)) |
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return -EINVAL; |
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dev_info(&client->dev, "detected revision %d\n", rev); |
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return 0; |
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} |
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static int max14656_get_property(struct power_supply *psy, |
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enum power_supply_property psp, |
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union power_supply_propval *val) |
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{ |
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struct max14656_chip *chip = power_supply_get_drvdata(psy); |
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switch (psp) { |
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case POWER_SUPPLY_PROP_ONLINE: |
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val->intval = chip->online; |
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break; |
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case POWER_SUPPLY_PROP_MODEL_NAME: |
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val->strval = MAX14656_NAME; |
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break; |
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case POWER_SUPPLY_PROP_MANUFACTURER: |
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val->strval = MAX14656_MANUFACTURER; |
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break; |
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default: |
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return -EINVAL; |
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} |
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return 0; |
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} |
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static enum power_supply_property max14656_battery_props[] = { |
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POWER_SUPPLY_PROP_ONLINE, |
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POWER_SUPPLY_PROP_MODEL_NAME, |
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POWER_SUPPLY_PROP_MANUFACTURER, |
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}; |
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static void stop_irq_work(void *data) |
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{ |
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struct max14656_chip *chip = data; |
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cancel_delayed_work_sync(&chip->irq_work); |
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} |
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static int max14656_probe(struct i2c_client *client, |
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const struct i2c_device_id *id) |
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{ |
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struct i2c_adapter *adapter = client->adapter; |
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struct device *dev = &client->dev; |
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struct power_supply_config psy_cfg = {}; |
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struct max14656_chip *chip; |
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int irq = client->irq; |
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int ret = 0; |
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if (irq <= 0) { |
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dev_err(dev, "invalid irq number: %d\n", irq); |
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return -ENODEV; |
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} |
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if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) { |
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dev_err(dev, "No support for SMBUS_BYTE_DATA\n"); |
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return -ENODEV; |
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} |
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chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL); |
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if (!chip) |
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return -ENOMEM; |
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psy_cfg.drv_data = chip; |
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chip->client = client; |
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chip->online = 0; |
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chip->psy_desc.name = MAX14656_NAME; |
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chip->psy_desc.type = POWER_SUPPLY_TYPE_UNKNOWN; |
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chip->psy_desc.properties = max14656_battery_props; |
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chip->psy_desc.num_properties = ARRAY_SIZE(max14656_battery_props); |
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chip->psy_desc.get_property = max14656_get_property; |
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chip->irq = irq; |
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ret = max14656_hw_init(chip); |
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if (ret) |
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return -ENODEV; |
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chip->detect_psy = devm_power_supply_register(dev, |
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&chip->psy_desc, &psy_cfg); |
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if (IS_ERR(chip->detect_psy)) { |
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dev_err(dev, "power_supply_register failed\n"); |
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return -EINVAL; |
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} |
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INIT_DELAYED_WORK(&chip->irq_work, max14656_irq_worker); |
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ret = devm_add_action(dev, stop_irq_work, chip); |
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if (ret) { |
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dev_err(dev, "devm_add_action %d failed\n", ret); |
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return ret; |
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} |
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ret = devm_request_irq(dev, chip->irq, max14656_irq, |
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IRQF_TRIGGER_FALLING, |
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MAX14656_NAME, chip); |
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if (ret) { |
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dev_err(dev, "request_irq %d failed\n", chip->irq); |
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return -EINVAL; |
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} |
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enable_irq_wake(chip->irq); |
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schedule_delayed_work(&chip->irq_work, msecs_to_jiffies(2000)); |
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return 0; |
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} |
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static const struct i2c_device_id max14656_id[] = { |
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{ "max14656", 0 }, |
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{} |
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}; |
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MODULE_DEVICE_TABLE(i2c, max14656_id); |
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static const struct of_device_id max14656_match_table[] = { |
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{ .compatible = "maxim,max14656", }, |
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{} |
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}; |
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MODULE_DEVICE_TABLE(of, max14656_match_table); |
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static struct i2c_driver max14656_i2c_driver = { |
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.driver = { |
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.name = "max14656", |
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.of_match_table = max14656_match_table, |
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}, |
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.probe = max14656_probe, |
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.id_table = max14656_id, |
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}; |
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module_i2c_driver(max14656_i2c_driver); |
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MODULE_DESCRIPTION("MAX14656 USB charger detector"); |
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MODULE_LICENSE("GPL v2");
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