| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Alexander Kurz | 1218 | 93.12% | 1 | 14.29% |
| Sven Van Asbroeck | 64 | 4.89% | 2 | 28.57% |
| Javier Martinez Canillas | 14 | 1.07% | 1 | 14.29% |
| Christophe Jaillet | 9 | 0.69% | 1 | 14.29% |
| Thomas Gleixner | 2 | 0.15% | 1 | 14.29% |
| Wolfram Sang | 1 | 0.08% | 1 | 14.29% |
| Total | 1308 | 7 |
// SPDX-License-Identifier: GPL-2.0-only /* * Maxim MAX14656 / AL32 USB Charger Detector driver * * Copyright (C) 2014 LG Electronics, Inc * Copyright (C) 2016 Alexander Kurz <akurz@blala.de> * * Components from Maxim AL32 Charger detection Driver for MX50 Yoshi Board * Copyright (C) Amazon Technologies Inc. All rights reserved. * Manish Lachwani (lachwani@lab126.com) */ #include <linux/module.h> #include <linux/init.h> #include <linux/delay.h> #include <linux/i2c.h> #include <linux/interrupt.h> #include <linux/slab.h> #include <linux/of_device.h> #include <linux/workqueue.h> #include <linux/power_supply.h> #include <linux/devm-helpers.h> #define MAX14656_MANUFACTURER "Maxim Integrated" #define MAX14656_NAME "max14656" #define MAX14656_DEVICE_ID 0x00 #define MAX14656_INTERRUPT_1 0x01 #define MAX14656_INTERRUPT_2 0x02 #define MAX14656_STATUS_1 0x03 #define MAX14656_STATUS_2 0x04 #define MAX14656_INTMASK_1 0x05 #define MAX14656_INTMASK_2 0x06 #define MAX14656_CONTROL_1 0x07 #define MAX14656_CONTROL_2 0x08 #define MAX14656_CONTROL_3 0x09 #define DEVICE_VENDOR_MASK 0xf0 #define DEVICE_REV_MASK 0x0f #define INT_EN_REG_MASK BIT(4) #define CHG_TYPE_INT_MASK BIT(0) #define STATUS1_VB_VALID_MASK BIT(4) #define STATUS1_CHG_TYPE_MASK 0xf #define INT1_DCD_TIMEOUT_MASK BIT(7) #define CONTROL1_DEFAULT 0x0d #define CONTROL1_INT_EN BIT(4) #define CONTROL1_INT_ACTIVE_HIGH BIT(5) #define CONTROL1_EDGE BIT(7) #define CONTROL2_DEFAULT 0x8e #define CONTROL2_ADC_EN BIT(0) #define CONTROL3_DEFAULT 0x8d enum max14656_chg_type { MAX14656_NO_CHARGER = 0, MAX14656_SDP_CHARGER, MAX14656_CDP_CHARGER, MAX14656_DCP_CHARGER, MAX14656_APPLE_500MA_CHARGER, MAX14656_APPLE_1A_CHARGER, MAX14656_APPLE_2A_CHARGER, MAX14656_SPECIAL_500MA_CHARGER, MAX14656_APPLE_12W, MAX14656_CHARGER_LAST }; static const struct max14656_chg_type_props { enum power_supply_type type; } chg_type_props[] = { { POWER_SUPPLY_TYPE_UNKNOWN }, { POWER_SUPPLY_TYPE_USB }, { POWER_SUPPLY_TYPE_USB_CDP }, { POWER_SUPPLY_TYPE_USB_DCP }, { POWER_SUPPLY_TYPE_USB_DCP }, { POWER_SUPPLY_TYPE_USB_DCP }, { POWER_SUPPLY_TYPE_USB_DCP }, { POWER_SUPPLY_TYPE_USB_DCP }, { POWER_SUPPLY_TYPE_USB }, }; struct max14656_chip { struct i2c_client *client; struct power_supply *detect_psy; struct power_supply_desc psy_desc; struct delayed_work irq_work; int irq; int online; }; static int max14656_read_reg(struct i2c_client *client, int reg, u8 *val) { s32 ret; ret = i2c_smbus_read_byte_data(client, reg); if (ret < 0) { dev_err(&client->dev, "i2c read fail: can't read from %02x: %d\n", reg, ret); return ret; } *val = ret; return 0; } static int max14656_write_reg(struct i2c_client *client, int reg, u8 val) { s32 ret; ret = i2c_smbus_write_byte_data(client, reg, val); if (ret < 0) { dev_err(&client->dev, "i2c write fail: can't write %02x to %02x: %d\n", val, reg, ret); return ret; } return 0; } static int max14656_read_block_reg(struct i2c_client *client, u8 reg, u8 length, u8 *val) { int ret; ret = i2c_smbus_read_i2c_block_data(client, reg, length, val); if (ret < 0) { dev_err(&client->dev, "failed to block read reg 0x%x: %d\n", reg, ret); return ret; } return 0; } #define REG_TOTAL_NUM 5 static void max14656_irq_worker(struct work_struct *work) { struct max14656_chip *chip = container_of(work, struct max14656_chip, irq_work.work); u8 buf[REG_TOTAL_NUM]; u8 chg_type; max14656_read_block_reg(chip->client, MAX14656_DEVICE_ID, REG_TOTAL_NUM, buf); if ((buf[MAX14656_STATUS_1] & STATUS1_VB_VALID_MASK) && (buf[MAX14656_STATUS_1] & STATUS1_CHG_TYPE_MASK)) { chg_type = buf[MAX14656_STATUS_1] & STATUS1_CHG_TYPE_MASK; if (chg_type < MAX14656_CHARGER_LAST) chip->psy_desc.type = chg_type_props[chg_type].type; else chip->psy_desc.type = POWER_SUPPLY_TYPE_UNKNOWN; chip->online = 1; } else { chip->online = 0; chip->psy_desc.type = POWER_SUPPLY_TYPE_UNKNOWN; } power_supply_changed(chip->detect_psy); } static irqreturn_t max14656_irq(int irq, void *dev_id) { struct max14656_chip *chip = dev_id; schedule_delayed_work(&chip->irq_work, msecs_to_jiffies(100)); return IRQ_HANDLED; } static int max14656_hw_init(struct max14656_chip *chip) { uint8_t val = 0; uint8_t rev; struct i2c_client *client = chip->client; if (max14656_read_reg(client, MAX14656_DEVICE_ID, &val)) return -ENODEV; if ((val & DEVICE_VENDOR_MASK) != 0x20) { dev_err(&client->dev, "wrong vendor ID %d\n", ((val & DEVICE_VENDOR_MASK) >> 4)); return -ENODEV; } rev = val & DEVICE_REV_MASK; /* Turn on ADC_EN */ if (max14656_write_reg(client, MAX14656_CONTROL_2, CONTROL2_ADC_EN)) return -EINVAL; /* turn on interrupts and low power mode */ if (max14656_write_reg(client, MAX14656_CONTROL_1, CONTROL1_DEFAULT | CONTROL1_INT_EN | CONTROL1_INT_ACTIVE_HIGH | CONTROL1_EDGE)) return -EINVAL; if (max14656_write_reg(client, MAX14656_INTMASK_1, 0x3)) return -EINVAL; if (max14656_write_reg(client, MAX14656_INTMASK_2, 0x1)) return -EINVAL; dev_info(&client->dev, "detected revision %d\n", rev); return 0; } static int max14656_get_property(struct power_supply *psy, enum power_supply_property psp, union power_supply_propval *val) { struct max14656_chip *chip = power_supply_get_drvdata(psy); switch (psp) { case POWER_SUPPLY_PROP_ONLINE: val->intval = chip->online; break; case POWER_SUPPLY_PROP_MODEL_NAME: val->strval = MAX14656_NAME; break; case POWER_SUPPLY_PROP_MANUFACTURER: val->strval = MAX14656_MANUFACTURER; break; default: return -EINVAL; } return 0; } static enum power_supply_property max14656_battery_props[] = { POWER_SUPPLY_PROP_ONLINE, POWER_SUPPLY_PROP_MODEL_NAME, POWER_SUPPLY_PROP_MANUFACTURER, }; static int max14656_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct i2c_adapter *adapter = client->adapter; struct device *dev = &client->dev; struct power_supply_config psy_cfg = {}; struct max14656_chip *chip; int irq = client->irq; int ret = 0; if (irq <= 0) { dev_err(dev, "invalid irq number: %d\n", irq); return -ENODEV; } if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) { dev_err(dev, "No support for SMBUS_BYTE_DATA\n"); return -ENODEV; } chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL); if (!chip) return -ENOMEM; psy_cfg.drv_data = chip; chip->client = client; chip->online = 0; chip->psy_desc.name = MAX14656_NAME; chip->psy_desc.type = POWER_SUPPLY_TYPE_UNKNOWN; chip->psy_desc.properties = max14656_battery_props; chip->psy_desc.num_properties = ARRAY_SIZE(max14656_battery_props); chip->psy_desc.get_property = max14656_get_property; chip->irq = irq; ret = max14656_hw_init(chip); if (ret) return -ENODEV; chip->detect_psy = devm_power_supply_register(dev, &chip->psy_desc, &psy_cfg); if (IS_ERR(chip->detect_psy)) { dev_err(dev, "power_supply_register failed\n"); return -EINVAL; } ret = devm_delayed_work_autocancel(dev, &chip->irq_work, max14656_irq_worker); if (ret) { dev_err(dev, "devm_delayed_work_autocancel %d failed\n", ret); return ret; } ret = devm_request_irq(dev, chip->irq, max14656_irq, IRQF_TRIGGER_FALLING, MAX14656_NAME, chip); if (ret) { dev_err(dev, "request_irq %d failed\n", chip->irq); return -EINVAL; } enable_irq_wake(chip->irq); schedule_delayed_work(&chip->irq_work, msecs_to_jiffies(2000)); return 0; } static const struct i2c_device_id max14656_id[] = { { "max14656", 0 }, {} }; MODULE_DEVICE_TABLE(i2c, max14656_id); static const struct of_device_id max14656_match_table[] = { { .compatible = "maxim,max14656", }, {} }; MODULE_DEVICE_TABLE(of, max14656_match_table); static struct i2c_driver max14656_i2c_driver = { .driver = { .name = "max14656", .of_match_table = max14656_match_table, }, .probe = max14656_probe, .id_table = max14656_id, }; module_i2c_driver(max14656_i2c_driver); MODULE_DESCRIPTION("MAX14656 USB charger detector"); MODULE_LICENSE("GPL v2");
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