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3dfed89512
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>
339 lines
8.3 KiB
C
339 lines
8.3 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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//
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// extcon-ptn5150.c - PTN5150 CC logic extcon driver to support USB detection
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//
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// Based on extcon-sm5502.c driver
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// Copyright (c) 2018-2019 by Vijai Kumar K
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// Author: Vijai Kumar K <vijaikumar.kanagarajan@gmail.com>
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#include <linux/err.h>
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#include <linux/i2c.h>
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/regmap.h>
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#include <linux/slab.h>
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#include <linux/extcon-provider.h>
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#include <linux/gpio/consumer.h>
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/* PTN5150 registers */
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enum ptn5150_reg {
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PTN5150_REG_DEVICE_ID = 0x01,
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PTN5150_REG_CONTROL,
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PTN5150_REG_INT_STATUS,
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PTN5150_REG_CC_STATUS,
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PTN5150_REG_CON_DET = 0x09,
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PTN5150_REG_VCONN_STATUS,
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PTN5150_REG_RESET,
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PTN5150_REG_INT_MASK = 0x18,
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PTN5150_REG_INT_REG_STATUS,
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PTN5150_REG_END,
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};
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#define PTN5150_DFP_ATTACHED 0x1
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#define PTN5150_UFP_ATTACHED 0x2
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/* Define PTN5150 MASK/SHIFT constant */
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#define PTN5150_REG_DEVICE_ID_VENDOR_SHIFT 0
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#define PTN5150_REG_DEVICE_ID_VENDOR_MASK \
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(0x3 << PTN5150_REG_DEVICE_ID_VENDOR_SHIFT)
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#define PTN5150_REG_DEVICE_ID_VERSION_SHIFT 3
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#define PTN5150_REG_DEVICE_ID_VERSION_MASK \
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(0x1f << PTN5150_REG_DEVICE_ID_VERSION_SHIFT)
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#define PTN5150_REG_CC_PORT_ATTACHMENT_SHIFT 2
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#define PTN5150_REG_CC_PORT_ATTACHMENT_MASK \
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(0x7 << PTN5150_REG_CC_PORT_ATTACHMENT_SHIFT)
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#define PTN5150_REG_CC_VBUS_DETECTION_SHIFT 7
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#define PTN5150_REG_CC_VBUS_DETECTION_MASK \
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(0x1 << PTN5150_REG_CC_VBUS_DETECTION_SHIFT)
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#define PTN5150_REG_INT_CABLE_ATTACH_SHIFT 0
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#define PTN5150_REG_INT_CABLE_ATTACH_MASK \
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(0x1 << PTN5150_REG_INT_CABLE_ATTACH_SHIFT)
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#define PTN5150_REG_INT_CABLE_DETACH_SHIFT 1
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#define PTN5150_REG_INT_CABLE_DETACH_MASK \
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(0x1 << PTN5150_REG_CC_CABLE_DETACH_SHIFT)
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struct ptn5150_info {
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struct device *dev;
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struct extcon_dev *edev;
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struct i2c_client *i2c;
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struct regmap *regmap;
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struct gpio_desc *int_gpiod;
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struct gpio_desc *vbus_gpiod;
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int irq;
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struct work_struct irq_work;
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struct mutex mutex;
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};
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/* List of detectable cables */
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static const unsigned int ptn5150_extcon_cable[] = {
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EXTCON_USB,
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EXTCON_USB_HOST,
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EXTCON_NONE,
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};
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static const struct regmap_config ptn5150_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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.max_register = PTN5150_REG_END,
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};
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static void ptn5150_irq_work(struct work_struct *work)
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{
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struct ptn5150_info *info = container_of(work,
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struct ptn5150_info, irq_work);
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int ret = 0;
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unsigned int reg_data;
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unsigned int int_status;
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if (!info->edev)
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return;
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mutex_lock(&info->mutex);
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ret = regmap_read(info->regmap, PTN5150_REG_CC_STATUS, ®_data);
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if (ret) {
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dev_err(info->dev, "failed to read CC STATUS %d\n", ret);
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mutex_unlock(&info->mutex);
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return;
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}
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/* Clear interrupt. Read would clear the register */
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ret = regmap_read(info->regmap, PTN5150_REG_INT_STATUS, &int_status);
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if (ret) {
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dev_err(info->dev, "failed to read INT STATUS %d\n", ret);
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mutex_unlock(&info->mutex);
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return;
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}
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if (int_status) {
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unsigned int cable_attach;
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cable_attach = int_status & PTN5150_REG_INT_CABLE_ATTACH_MASK;
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if (cable_attach) {
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unsigned int port_status;
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unsigned int vbus;
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port_status = ((reg_data &
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PTN5150_REG_CC_PORT_ATTACHMENT_MASK) >>
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PTN5150_REG_CC_PORT_ATTACHMENT_SHIFT);
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switch (port_status) {
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case PTN5150_DFP_ATTACHED:
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extcon_set_state_sync(info->edev,
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EXTCON_USB_HOST, false);
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gpiod_set_value(info->vbus_gpiod, 0);
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extcon_set_state_sync(info->edev, EXTCON_USB,
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true);
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break;
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case PTN5150_UFP_ATTACHED:
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extcon_set_state_sync(info->edev, EXTCON_USB,
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false);
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vbus = ((reg_data &
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PTN5150_REG_CC_VBUS_DETECTION_MASK) >>
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PTN5150_REG_CC_VBUS_DETECTION_SHIFT);
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if (vbus)
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gpiod_set_value(info->vbus_gpiod, 0);
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else
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gpiod_set_value(info->vbus_gpiod, 1);
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extcon_set_state_sync(info->edev,
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EXTCON_USB_HOST, true);
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break;
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default:
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dev_err(info->dev,
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"Unknown Port status : %x\n",
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port_status);
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break;
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}
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} else {
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extcon_set_state_sync(info->edev,
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EXTCON_USB_HOST, false);
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extcon_set_state_sync(info->edev,
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EXTCON_USB, false);
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gpiod_set_value(info->vbus_gpiod, 0);
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}
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}
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/* Clear interrupt. Read would clear the register */
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ret = regmap_read(info->regmap, PTN5150_REG_INT_REG_STATUS,
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&int_status);
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if (ret) {
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dev_err(info->dev,
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"failed to read INT REG STATUS %d\n", ret);
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mutex_unlock(&info->mutex);
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return;
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}
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mutex_unlock(&info->mutex);
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}
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static irqreturn_t ptn5150_irq_handler(int irq, void *data)
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{
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struct ptn5150_info *info = data;
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schedule_work(&info->irq_work);
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return IRQ_HANDLED;
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}
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static int ptn5150_init_dev_type(struct ptn5150_info *info)
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{
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unsigned int reg_data, vendor_id, version_id;
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int ret;
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ret = regmap_read(info->regmap, PTN5150_REG_DEVICE_ID, ®_data);
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if (ret) {
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dev_err(info->dev, "failed to read DEVICE_ID %d\n", ret);
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return -EINVAL;
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}
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vendor_id = ((reg_data & PTN5150_REG_DEVICE_ID_VENDOR_MASK) >>
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PTN5150_REG_DEVICE_ID_VENDOR_SHIFT);
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version_id = ((reg_data & PTN5150_REG_DEVICE_ID_VERSION_MASK) >>
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PTN5150_REG_DEVICE_ID_VERSION_SHIFT);
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dev_info(info->dev, "Device type: version: 0x%x, vendor: 0x%x\n",
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version_id, vendor_id);
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/* Clear any existing interrupts */
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ret = regmap_read(info->regmap, PTN5150_REG_INT_STATUS, ®_data);
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if (ret) {
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dev_err(info->dev,
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"failed to read PTN5150_REG_INT_STATUS %d\n",
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ret);
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return -EINVAL;
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}
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ret = regmap_read(info->regmap, PTN5150_REG_INT_REG_STATUS, ®_data);
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if (ret) {
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dev_err(info->dev,
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"failed to read PTN5150_REG_INT_REG_STATUS %d\n", ret);
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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 int ptn5150_i2c_probe(struct i2c_client *i2c,
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const struct i2c_device_id *id)
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{
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struct device *dev = &i2c->dev;
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struct device_node *np = i2c->dev.of_node;
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struct ptn5150_info *info;
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int ret;
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if (!np)
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return -EINVAL;
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info = devm_kzalloc(&i2c->dev, sizeof(*info), GFP_KERNEL);
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if (!info)
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return -ENOMEM;
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i2c_set_clientdata(i2c, info);
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info->dev = &i2c->dev;
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info->i2c = i2c;
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info->int_gpiod = devm_gpiod_get(&i2c->dev, "int", GPIOD_IN);
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if (IS_ERR(info->int_gpiod)) {
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dev_err(dev, "failed to get INT GPIO\n");
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return PTR_ERR(info->int_gpiod);
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}
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info->vbus_gpiod = devm_gpiod_get(&i2c->dev, "vbus", GPIOD_IN);
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if (IS_ERR(info->vbus_gpiod)) {
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dev_err(dev, "failed to get VBUS GPIO\n");
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return PTR_ERR(info->vbus_gpiod);
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}
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ret = gpiod_direction_output(info->vbus_gpiod, 0);
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if (ret) {
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dev_err(dev, "failed to set VBUS GPIO direction\n");
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return -EINVAL;
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}
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mutex_init(&info->mutex);
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INIT_WORK(&info->irq_work, ptn5150_irq_work);
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info->regmap = devm_regmap_init_i2c(i2c, &ptn5150_regmap_config);
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if (IS_ERR(info->regmap)) {
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ret = PTR_ERR(info->regmap);
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dev_err(info->dev, "failed to allocate register map: %d\n",
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ret);
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return ret;
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}
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if (info->int_gpiod) {
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info->irq = gpiod_to_irq(info->int_gpiod);
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if (info->irq < 0) {
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dev_err(dev, "failed to get INTB IRQ\n");
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return info->irq;
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}
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ret = devm_request_threaded_irq(dev, info->irq, NULL,
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ptn5150_irq_handler,
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IRQF_TRIGGER_FALLING |
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IRQF_ONESHOT,
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i2c->name, info);
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if (ret < 0) {
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dev_err(dev, "failed to request handler for INTB IRQ\n");
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return ret;
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}
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}
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/* Allocate extcon device */
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info->edev = devm_extcon_dev_allocate(info->dev, ptn5150_extcon_cable);
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if (IS_ERR(info->edev)) {
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dev_err(info->dev, "failed to allocate memory for extcon\n");
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return -ENOMEM;
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}
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/* Register extcon device */
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ret = devm_extcon_dev_register(info->dev, info->edev);
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if (ret) {
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dev_err(info->dev, "failed to register extcon device\n");
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return ret;
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}
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/* Initialize PTN5150 device and print vendor id and version id */
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ret = ptn5150_init_dev_type(info);
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if (ret)
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return -EINVAL;
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return 0;
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}
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static const struct of_device_id ptn5150_dt_match[] = {
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{ .compatible = "nxp,ptn5150" },
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{ },
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};
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MODULE_DEVICE_TABLE(of, ptn5150_dt_match);
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static const struct i2c_device_id ptn5150_i2c_id[] = {
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{ "ptn5150", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, ptn5150_i2c_id);
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static struct i2c_driver ptn5150_i2c_driver = {
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.driver = {
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.name = "ptn5150",
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.of_match_table = ptn5150_dt_match,
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},
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.probe = ptn5150_i2c_probe,
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.id_table = ptn5150_i2c_id,
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};
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static int __init ptn5150_i2c_init(void)
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{
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return i2c_add_driver(&ptn5150_i2c_driver);
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}
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subsys_initcall(ptn5150_i2c_init);
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MODULE_DESCRIPTION("NXP PTN5150 CC logic Extcon driver");
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MODULE_AUTHOR("Vijai Kumar K <vijaikumar.kanagarajan@gmail.com>");
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MODULE_LICENSE("GPL v2");
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