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linux/drivers/extcon/extcon-ptn5150.c
Krzysztof Kozlowski 6be65ed4f8 extcon: ptn5150: Do not print error during probe if nothing is attached 
The commit 85256f611f ("extcon: ptn5150: Check current USB mode when
probing") reused code for checking CC status register in the probe path
to determine what is initially connected.  However if nothing is
connected, the CC status register will have 0x0 value and print an error
message:

    ptn5150 1-003d: Unknown Port status : 0

This is not an error.  Also any other unknown port status values are not
really errors but unhandled cases.

Fixes: 85256f611f ("extcon: ptn5150: Check current USB mode when probing")
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
2020-09-30 00:38:54 +09:00

324 lines
8.2 KiB
C
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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>
// Copyright (c) 2020 Krzysztof Kozlowski <krzk@kernel.org>
#include <linux/bitfield.h>
#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 */
#define PTN5150_REG_DEVICE_ID 0x01
#define PTN5150_REG_CONTROL 0x02
#define PTN5150_REG_INT_STATUS 0x03
#define PTN5150_REG_CC_STATUS 0x04
#define PTN5150_REG_CON_DET 0x09
#define PTN5150_REG_VCONN_STATUS 0x0a
#define PTN5150_REG_RESET 0x0b
#define PTN5150_REG_INT_MASK 0x18
#define PTN5150_REG_INT_REG_STATUS 0x19
#define PTN5150_REG_END PTN5150_REG_INT_REG_STATUS
#define PTN5150_DFP_ATTACHED 0x1
#define PTN5150_UFP_ATTACHED 0x2
/* Define PTN5150 MASK/SHIFT constant */
#define PTN5150_REG_DEVICE_ID_VERSION GENMASK(7, 3)
#define PTN5150_REG_DEVICE_ID_VENDOR GENMASK(2, 0)
#define PTN5150_REG_CC_PORT_ATTACHMENT GENMASK(4, 2)
#define PTN5150_REG_CC_VBUS_DETECTION BIT(7)
#define PTN5150_REG_INT_CABLE_ATTACH_MASK BIT(0)
#define PTN5150_REG_INT_CABLE_DETACH_MASK BIT(1)
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_check_state(struct ptn5150_info *info)
{
unsigned int port_status, reg_data, vbus;
int ret;
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);
return;
}
port_status = FIELD_GET(PTN5150_REG_CC_PORT_ATTACHMENT, reg_data);
switch (port_status) {
case PTN5150_DFP_ATTACHED:
extcon_set_state_sync(info->edev, EXTCON_USB_HOST, false);
gpiod_set_value_cansleep(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 = FIELD_GET(PTN5150_REG_CC_VBUS_DETECTION, reg_data);
if (vbus)
gpiod_set_value_cansleep(info->vbus_gpiod, 0);
else
gpiod_set_value_cansleep(info->vbus_gpiod, 1);
extcon_set_state_sync(info->edev, EXTCON_USB_HOST, true);
break;
default:
break;
}
}
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 int_status;
if (!info->edev)
return;
mutex_lock(&info->mutex);
/* 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) {
ptn5150_check_state(info);
} else {
extcon_set_state_sync(info->edev,
EXTCON_USB_HOST, false);
extcon_set_state_sync(info->edev,
EXTCON_USB, false);
gpiod_set_value_cansleep(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 = FIELD_GET(PTN5150_REG_DEVICE_ID_VENDOR, reg_data);
version_id = FIELD_GET(PTN5150_REG_DEVICE_ID_VERSION, reg_data);
dev_dbg(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)
{
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->vbus_gpiod = devm_gpiod_get(&i2c->dev, "vbus", GPIOD_OUT_LOW);
if (IS_ERR(info->vbus_gpiod)) {
ret = PTR_ERR(info->vbus_gpiod);
if (ret == -ENOENT) {
dev_info(dev, "No VBUS GPIO, ignoring VBUS control\n");
info->vbus_gpiod = NULL;
} else {
return dev_err_probe(dev, ret, "failed to get VBUS GPIO\n");
}
}
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)) {
return dev_err_probe(info->dev, PTR_ERR(info->regmap),
"failed to allocate register map\n");
}
if (i2c->irq > 0) {
info->irq = i2c->irq;
} else {
info->int_gpiod = devm_gpiod_get(&i2c->dev, "int", GPIOD_IN);
if (IS_ERR(info->int_gpiod)) {
return dev_err_probe(dev, PTR_ERR(info->int_gpiod),
"failed to get INT GPIO\n");
}
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;
}
extcon_set_property_capability(info->edev, EXTCON_USB,
EXTCON_PROP_USB_VBUS);
extcon_set_property_capability(info->edev, EXTCON_USB_HOST,
EXTCON_PROP_USB_VBUS);
extcon_set_property_capability(info->edev, EXTCON_USB_HOST,
EXTCON_PROP_USB_TYPEC_POLARITY);
/* Initialize PTN5150 device and print vendor id and version id */
ret = ptn5150_init_dev_type(info);
if (ret)
return -EINVAL;
/*
* Update current extcon state if for example OTG connection was there
* before the probe
*/
mutex_lock(&info->mutex);
ptn5150_check_state(info);
mutex_unlock(&info->mutex);
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_new = ptn5150_i2c_probe,
.id_table = ptn5150_i2c_id,
};
module_i2c_driver(ptn5150_i2c_driver);
MODULE_DESCRIPTION("NXP PTN5150 CC logic Extcon driver");
MODULE_AUTHOR("Vijai Kumar K <vijaikumar.kanagarajan@gmail.com>");
MODULE_AUTHOR("Krzysztof Kozlowski <krzk@kernel.org>");
MODULE_LICENSE("GPL v2");
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