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linux-next/drivers/extcon/extcon-ptn5150.c
Wei Yongjun 3dfed89512 extcon: ptn5150: Fix return value check in ptn5150_i2c_probe() 
In case of error, the function devm_gpiod_get() returns ERR_PTR() and
never returns NULL. The NULL test in the return value check should be
replaced with IS_ERR().

Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
2019-02-11 17:21:38 +09:00

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// SPDX-License-Identifier: GPL-2.0+
//
// extcon-ptn5150.c - PTN5150 CC logic extcon driver to support USB detection
//
// Based on extcon-sm5502.c driver
// Copyright (c) 2018-2019 by Vijai Kumar K
// Author: Vijai Kumar K <vijaikumar.kanagarajan@gmail.com>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#include <linux/extcon-provider.h>
#include <linux/gpio/consumer.h>
/* PTN5150 registers */
enum ptn5150_reg {
PTN5150_REG_DEVICE_ID = 0x01,
PTN5150_REG_CONTROL,
PTN5150_REG_INT_STATUS,
PTN5150_REG_CC_STATUS,
PTN5150_REG_CON_DET = 0x09,
PTN5150_REG_VCONN_STATUS,
PTN5150_REG_RESET,
PTN5150_REG_INT_MASK = 0x18,
PTN5150_REG_INT_REG_STATUS,
PTN5150_REG_END,
};
#define PTN5150_DFP_ATTACHED 0x1
#define PTN5150_UFP_ATTACHED 0x2
/* Define PTN5150 MASK/SHIFT constant */
#define PTN5150_REG_DEVICE_ID_VENDOR_SHIFT 0
#define PTN5150_REG_DEVICE_ID_VENDOR_MASK \
(0x3 << PTN5150_REG_DEVICE_ID_VENDOR_SHIFT)
#define PTN5150_REG_DEVICE_ID_VERSION_SHIFT 3
#define PTN5150_REG_DEVICE_ID_VERSION_MASK \
(0x1f << PTN5150_REG_DEVICE_ID_VERSION_SHIFT)
#define PTN5150_REG_CC_PORT_ATTACHMENT_SHIFT 2
#define PTN5150_REG_CC_PORT_ATTACHMENT_MASK \
(0x7 << PTN5150_REG_CC_PORT_ATTACHMENT_SHIFT)
#define PTN5150_REG_CC_VBUS_DETECTION_SHIFT 7
#define PTN5150_REG_CC_VBUS_DETECTION_MASK \
(0x1 << PTN5150_REG_CC_VBUS_DETECTION_SHIFT)
#define PTN5150_REG_INT_CABLE_ATTACH_SHIFT 0
#define PTN5150_REG_INT_CABLE_ATTACH_MASK \
(0x1 << PTN5150_REG_INT_CABLE_ATTACH_SHIFT)
#define PTN5150_REG_INT_CABLE_DETACH_SHIFT 1
#define PTN5150_REG_INT_CABLE_DETACH_MASK \
(0x1 << PTN5150_REG_CC_CABLE_DETACH_SHIFT)
struct ptn5150_info {
struct device *dev;
struct extcon_dev *edev;
struct i2c_client *i2c;
struct regmap *regmap;
struct gpio_desc *int_gpiod;
struct gpio_desc *vbus_gpiod;
int irq;
struct work_struct irq_work;
struct mutex mutex;
};
/* List of detectable cables */
static const unsigned int ptn5150_extcon_cable[] = {
EXTCON_USB,
EXTCON_USB_HOST,
EXTCON_NONE,
};
static const struct regmap_config ptn5150_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = PTN5150_REG_END,
};
static void ptn5150_irq_work(struct work_struct *work)
{
struct ptn5150_info *info = container_of(work,
struct ptn5150_info, irq_work);
int ret = 0;
unsigned int reg_data;
unsigned int int_status;
if (!info->edev)
return;
mutex_lock(&info->mutex);
ret = regmap_read(info->regmap, PTN5150_REG_CC_STATUS, &reg_data);
if (ret) {
dev_err(info->dev, "failed to read CC STATUS %d\n", ret);
mutex_unlock(&info->mutex);
return;
}
/* Clear interrupt. Read would clear the register */
ret = regmap_read(info->regmap, PTN5150_REG_INT_STATUS, &int_status);
if (ret) {
dev_err(info->dev, "failed to read INT STATUS %d\n", ret);
mutex_unlock(&info->mutex);
return;
}
if (int_status) {
unsigned int cable_attach;
cable_attach = int_status & PTN5150_REG_INT_CABLE_ATTACH_MASK;
if (cable_attach) {
unsigned int port_status;
unsigned int vbus;
port_status = ((reg_data &
PTN5150_REG_CC_PORT_ATTACHMENT_MASK) >>
PTN5150_REG_CC_PORT_ATTACHMENT_SHIFT);
switch (port_status) {
case PTN5150_DFP_ATTACHED:
extcon_set_state_sync(info->edev,
EXTCON_USB_HOST, false);
gpiod_set_value(info->vbus_gpiod, 0);
extcon_set_state_sync(info->edev, EXTCON_USB,
true);
break;
case PTN5150_UFP_ATTACHED:
extcon_set_state_sync(info->edev, EXTCON_USB,
false);
vbus = ((reg_data &
PTN5150_REG_CC_VBUS_DETECTION_MASK) >>
PTN5150_REG_CC_VBUS_DETECTION_SHIFT);
if (vbus)
gpiod_set_value(info->vbus_gpiod, 0);
else
gpiod_set_value(info->vbus_gpiod, 1);
extcon_set_state_sync(info->edev,
EXTCON_USB_HOST, true);
break;
default:
dev_err(info->dev,
"Unknown Port status : %x\n",
port_status);
break;
}
} else {
extcon_set_state_sync(info->edev,
EXTCON_USB_HOST, false);
extcon_set_state_sync(info->edev,
EXTCON_USB, false);
gpiod_set_value(info->vbus_gpiod, 0);
}
}
/* Clear interrupt. Read would clear the register */
ret = regmap_read(info->regmap, PTN5150_REG_INT_REG_STATUS,
&int_status);
if (ret) {
dev_err(info->dev,
"failed to read INT REG STATUS %d\n", ret);
mutex_unlock(&info->mutex);
return;
}
mutex_unlock(&info->mutex);
}
static irqreturn_t ptn5150_irq_handler(int irq, void *data)
{
struct ptn5150_info *info = data;
schedule_work(&info->irq_work);
return IRQ_HANDLED;
}
static int ptn5150_init_dev_type(struct ptn5150_info *info)
{
unsigned int reg_data, vendor_id, version_id;
int ret;
ret = regmap_read(info->regmap, PTN5150_REG_DEVICE_ID, &reg_data);
if (ret) {
dev_err(info->dev, "failed to read DEVICE_ID %d\n", ret);
return -EINVAL;
}
vendor_id = ((reg_data & PTN5150_REG_DEVICE_ID_VENDOR_MASK) >>
PTN5150_REG_DEVICE_ID_VENDOR_SHIFT);
version_id = ((reg_data & PTN5150_REG_DEVICE_ID_VERSION_MASK) >>
PTN5150_REG_DEVICE_ID_VERSION_SHIFT);
dev_info(info->dev, "Device type: version: 0x%x, vendor: 0x%x\n",
version_id, vendor_id);
/* Clear any existing interrupts */
ret = regmap_read(info->regmap, PTN5150_REG_INT_STATUS, &reg_data);
if (ret) {
dev_err(info->dev,
"failed to read PTN5150_REG_INT_STATUS %d\n",
ret);
return -EINVAL;
}
ret = regmap_read(info->regmap, PTN5150_REG_INT_REG_STATUS, &reg_data);
if (ret) {
dev_err(info->dev,
"failed to read PTN5150_REG_INT_REG_STATUS %d\n", ret);
return -EINVAL;
}
return 0;
}
static int ptn5150_i2c_probe(struct i2c_client *i2c,
const struct i2c_device_id *id)
{
struct device *dev = &i2c->dev;
struct device_node *np = i2c->dev.of_node;
struct ptn5150_info *info;
int ret;
if (!np)
return -EINVAL;
info = devm_kzalloc(&i2c->dev, sizeof(*info), GFP_KERNEL);
if (!info)
return -ENOMEM;
i2c_set_clientdata(i2c, info);
info->dev = &i2c->dev;
info->i2c = i2c;
info->int_gpiod = devm_gpiod_get(&i2c->dev, "int", GPIOD_IN);
if (IS_ERR(info->int_gpiod)) {
dev_err(dev, "failed to get INT GPIO\n");
return PTR_ERR(info->int_gpiod);
}
info->vbus_gpiod = devm_gpiod_get(&i2c->dev, "vbus", GPIOD_IN);
if (IS_ERR(info->vbus_gpiod)) {
dev_err(dev, "failed to get VBUS GPIO\n");
return PTR_ERR(info->vbus_gpiod);
}
ret = gpiod_direction_output(info->vbus_gpiod, 0);
if (ret) {
dev_err(dev, "failed to set VBUS GPIO direction\n");
return -EINVAL;
}
mutex_init(&info->mutex);
INIT_WORK(&info->irq_work, ptn5150_irq_work);
info->regmap = devm_regmap_init_i2c(i2c, &ptn5150_regmap_config);
if (IS_ERR(info->regmap)) {
ret = PTR_ERR(info->regmap);
dev_err(info->dev, "failed to allocate register map: %d\n",
ret);
return ret;
}
if (info->int_gpiod) {
info->irq = gpiod_to_irq(info->int_gpiod);
if (info->irq < 0) {
dev_err(dev, "failed to get INTB IRQ\n");
return info->irq;
}
ret = devm_request_threaded_irq(dev, info->irq, NULL,
ptn5150_irq_handler,
IRQF_TRIGGER_FALLING |
IRQF_ONESHOT,
i2c->name, info);
if (ret < 0) {
dev_err(dev, "failed to request handler for INTB IRQ\n");
return ret;
}
}
/* Allocate extcon device */
info->edev = devm_extcon_dev_allocate(info->dev, ptn5150_extcon_cable);
if (IS_ERR(info->edev)) {
dev_err(info->dev, "failed to allocate memory for extcon\n");
return -ENOMEM;
}
/* Register extcon device */
ret = devm_extcon_dev_register(info->dev, info->edev);
if (ret) {
dev_err(info->dev, "failed to register extcon device\n");
return ret;
}
/* Initialize PTN5150 device and print vendor id and version id */
ret = ptn5150_init_dev_type(info);
if (ret)
return -EINVAL;
return 0;
}
static const struct of_device_id ptn5150_dt_match[] = {
{ .compatible = "nxp,ptn5150" },
{ },
};
MODULE_DEVICE_TABLE(of, ptn5150_dt_match);
static const struct i2c_device_id ptn5150_i2c_id[] = {
{ "ptn5150", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, ptn5150_i2c_id);
static struct i2c_driver ptn5150_i2c_driver = {
.driver = {
.name = "ptn5150",
.of_match_table = ptn5150_dt_match,
},
.probe = ptn5150_i2c_probe,
.id_table = ptn5150_i2c_id,
};
static int __init ptn5150_i2c_init(void)
{
return i2c_add_driver(&ptn5150_i2c_driver);
}
subsys_initcall(ptn5150_i2c_init);
MODULE_DESCRIPTION("NXP PTN5150 CC logic Extcon driver");
MODULE_AUTHOR("Vijai Kumar K <vijaikumar.kanagarajan@gmail.com>");
MODULE_LICENSE("GPL v2");
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