2 * Maxim MAX14656 / AL32 USB Charger Detector driver
4 * Copyright (C) 2014 LG Electronics, Inc
5 * Copyright (C) 2016 Alexander Kurz <akurz@blala.de>
7 * Components from Maxim AL32 Charger detection Driver for MX50 Yoshi Board
8 * Copyright (C) Amazon Technologies Inc. All rights reserved.
9 * Manish Lachwani (lachwani@lab126.com)
11 * This package is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 and
13 * only version 2 as published by the Free Software Foundation.
16 #include <linux/module.h>
17 #include <linux/init.h>
18 #include <linux/delay.h>
19 #include <linux/i2c.h>
20 #include <linux/interrupt.h>
21 #include <linux/slab.h>
22 #include <linux/gpio.h>
23 #include <linux/of_gpio.h>
24 #include <linux/of_device.h>
25 #include <linux/workqueue.h>
26 #include <linux/power_supply.h>
28 #define MAX14656_MANUFACTURER "Maxim Integrated"
29 #define MAX14656_NAME "max14656"
31 #define MAX14656_DEVICE_ID 0x00
32 #define MAX14656_INTERRUPT_1 0x01
33 #define MAX14656_INTERRUPT_2 0x02
34 #define MAX14656_STATUS_1 0x03
35 #define MAX14656_STATUS_2 0x04
36 #define MAX14656_INTMASK_1 0x05
37 #define MAX14656_INTMASK_2 0x06
38 #define MAX14656_CONTROL_1 0x07
39 #define MAX14656_CONTROL_2 0x08
40 #define MAX14656_CONTROL_3 0x09
42 #define DEVICE_VENDOR_MASK 0xf0
43 #define DEVICE_REV_MASK 0x0f
44 #define INT_EN_REG_MASK BIT(4)
45 #define CHG_TYPE_INT_MASK BIT(0)
46 #define STATUS1_VB_VALID_MASK BIT(4)
47 #define STATUS1_CHG_TYPE_MASK 0xf
48 #define INT1_DCD_TIMEOUT_MASK BIT(7)
49 #define CONTROL1_DEFAULT 0x0d
50 #define CONTROL1_INT_EN BIT(4)
51 #define CONTROL1_INT_ACTIVE_HIGH BIT(5)
52 #define CONTROL1_EDGE BIT(7)
53 #define CONTROL2_DEFAULT 0x8e
54 #define CONTROL2_ADC_EN BIT(0)
55 #define CONTROL3_DEFAULT 0x8d
57 enum max14656_chg_type {
58 MAX14656_NO_CHARGER = 0,
62 MAX14656_APPLE_500MA_CHARGER,
63 MAX14656_APPLE_1A_CHARGER,
64 MAX14656_APPLE_2A_CHARGER,
65 MAX14656_SPECIAL_500MA_CHARGER,
70 static const struct max14656_chg_type_props {
71 enum power_supply_type type;
72 } chg_type_props[] = {
73 { POWER_SUPPLY_TYPE_UNKNOWN },
74 { POWER_SUPPLY_TYPE_USB },
75 { POWER_SUPPLY_TYPE_USB_CDP },
76 { POWER_SUPPLY_TYPE_USB_DCP },
77 { POWER_SUPPLY_TYPE_USB_DCP },
78 { POWER_SUPPLY_TYPE_USB_DCP },
79 { POWER_SUPPLY_TYPE_USB_DCP },
80 { POWER_SUPPLY_TYPE_USB_DCP },
81 { POWER_SUPPLY_TYPE_USB },
84 struct max14656_chip {
85 struct i2c_client *client;
86 struct power_supply *detect_psy;
87 struct power_supply_desc psy_desc;
88 struct delayed_work irq_work;
94 static int max14656_read_reg(struct i2c_client *client, int reg, u8 *val)
98 ret = i2c_smbus_read_byte_data(client, reg);
100 dev_err(&client->dev,
101 "i2c read fail: can't read from %02x: %d\n",
109 static int max14656_write_reg(struct i2c_client *client, int reg, u8 val)
113 ret = i2c_smbus_write_byte_data(client, reg, val);
115 dev_err(&client->dev,
116 "i2c write fail: can't write %02x to %02x: %d\n",
123 static int max14656_read_block_reg(struct i2c_client *client, u8 reg,
128 ret = i2c_smbus_read_i2c_block_data(client, reg, length, val);
130 dev_err(&client->dev, "failed to block read reg 0x%x: %d\n",
138 #define REG_TOTAL_NUM 5
139 static void max14656_irq_worker(struct work_struct *work)
141 struct max14656_chip *chip =
142 container_of(work, struct max14656_chip, irq_work.work);
144 u8 buf[REG_TOTAL_NUM];
148 ret = max14656_read_block_reg(chip->client, MAX14656_DEVICE_ID,
151 if ((buf[MAX14656_STATUS_1] & STATUS1_VB_VALID_MASK) &&
152 (buf[MAX14656_STATUS_1] & STATUS1_CHG_TYPE_MASK)) {
153 chg_type = buf[MAX14656_STATUS_1] & STATUS1_CHG_TYPE_MASK;
154 if (chg_type < MAX14656_CHARGER_LAST)
155 chip->psy_desc.type = chg_type_props[chg_type].type;
157 chip->psy_desc.type = POWER_SUPPLY_TYPE_UNKNOWN;
161 chip->psy_desc.type = POWER_SUPPLY_TYPE_UNKNOWN;
164 power_supply_changed(chip->detect_psy);
167 static irqreturn_t max14656_irq(int irq, void *dev_id)
169 struct max14656_chip *chip = dev_id;
171 schedule_delayed_work(&chip->irq_work, msecs_to_jiffies(100));
176 static int max14656_hw_init(struct max14656_chip *chip)
180 struct i2c_client *client = chip->client;
182 if (max14656_read_reg(client, MAX14656_DEVICE_ID, &val))
185 if ((val & DEVICE_VENDOR_MASK) != 0x20) {
186 dev_err(&client->dev, "wrong vendor ID %d\n",
187 ((val & DEVICE_VENDOR_MASK) >> 4));
190 rev = val & DEVICE_REV_MASK;
193 if (max14656_write_reg(client, MAX14656_CONTROL_2, CONTROL2_ADC_EN))
196 /* turn on interrupts and low power mode */
197 if (max14656_write_reg(client, MAX14656_CONTROL_1,
200 CONTROL1_INT_ACTIVE_HIGH |
204 if (max14656_write_reg(client, MAX14656_INTMASK_1, 0x3))
207 if (max14656_write_reg(client, MAX14656_INTMASK_2, 0x1))
210 dev_info(&client->dev, "detected revision %d\n", rev);
214 static int max14656_get_property(struct power_supply *psy,
215 enum power_supply_property psp,
216 union power_supply_propval *val)
218 struct max14656_chip *chip = power_supply_get_drvdata(psy);
221 case POWER_SUPPLY_PROP_ONLINE:
222 val->intval = chip->online;
224 case POWER_SUPPLY_PROP_MODEL_NAME:
225 val->strval = MAX14656_NAME;
227 case POWER_SUPPLY_PROP_MANUFACTURER:
228 val->strval = MAX14656_MANUFACTURER;
237 static enum power_supply_property max14656_battery_props[] = {
238 POWER_SUPPLY_PROP_ONLINE,
239 POWER_SUPPLY_PROP_MODEL_NAME,
240 POWER_SUPPLY_PROP_MANUFACTURER,
243 static void stop_irq_work(void *data)
245 struct max14656_chip *chip = data;
247 cancel_delayed_work_sync(&chip->irq_work);
251 static int max14656_probe(struct i2c_client *client,
252 const struct i2c_device_id *id)
254 struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
255 struct device *dev = &client->dev;
256 struct power_supply_config psy_cfg = {};
257 struct max14656_chip *chip;
258 int irq = client->irq;
262 dev_err(dev, "invalid irq number: %d\n", irq);
266 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
267 dev_err(dev, "No support for SMBUS_BYTE_DATA\n");
271 chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
275 psy_cfg.drv_data = chip;
276 chip->client = client;
278 chip->psy_desc.name = MAX14656_NAME;
279 chip->psy_desc.type = POWER_SUPPLY_TYPE_UNKNOWN;
280 chip->psy_desc.properties = max14656_battery_props;
281 chip->psy_desc.num_properties = ARRAY_SIZE(max14656_battery_props);
282 chip->psy_desc.get_property = max14656_get_property;
285 ret = max14656_hw_init(chip);
289 chip->detect_psy = devm_power_supply_register(dev,
290 &chip->psy_desc, &psy_cfg);
291 if (IS_ERR(chip->detect_psy)) {
292 dev_err(dev, "power_supply_register failed\n");
296 INIT_DELAYED_WORK(&chip->irq_work, max14656_irq_worker);
297 ret = devm_add_action(dev, stop_irq_work, chip);
299 dev_err(dev, "devm_add_action %d failed\n", ret);
303 ret = devm_request_irq(dev, chip->irq, max14656_irq,
304 IRQF_TRIGGER_FALLING,
305 MAX14656_NAME, chip);
307 dev_err(dev, "request_irq %d failed\n", chip->irq);
310 enable_irq_wake(chip->irq);
312 schedule_delayed_work(&chip->irq_work, msecs_to_jiffies(2000));
317 static const struct i2c_device_id max14656_id[] = {
321 MODULE_DEVICE_TABLE(i2c, max14656_id);
323 static const struct of_device_id max14656_match_table[] = {
324 { .compatible = "maxim,max14656", },
327 MODULE_DEVICE_TABLE(of, max14656_match_table);
329 static struct i2c_driver max14656_i2c_driver = {
332 .of_match_table = max14656_match_table,
334 .probe = max14656_probe,
335 .id_table = max14656_id,
337 module_i2c_driver(max14656_i2c_driver);
339 MODULE_DESCRIPTION("MAX14656 USB charger detector");
340 MODULE_LICENSE("GPL v2");