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340 lines
8.2 KiB
340 lines
8.2 KiB
/*
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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 <akurz@blala.de>
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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 (lachwani@lab126.com)
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*
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* This package is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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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/gpio.h>
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#include <linux/of_gpio.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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int ret = 0;
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ret = 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 = to_i2c_adapter(client->dev.parent);
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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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