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323 lines
8.2 KiB
323 lines
8.2 KiB
// 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 <[email protected]> |
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// Copyright (c) 2020 Krzysztof Kozlowski <[email protected]> |
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#include <linux/bitfield.h> |
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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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#define PTN5150_REG_DEVICE_ID 0x01 |
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#define PTN5150_REG_CONTROL 0x02 |
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#define PTN5150_REG_INT_STATUS 0x03 |
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#define PTN5150_REG_CC_STATUS 0x04 |
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#define PTN5150_REG_CON_DET 0x09 |
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#define PTN5150_REG_VCONN_STATUS 0x0a |
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#define PTN5150_REG_RESET 0x0b |
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#define PTN5150_REG_INT_MASK 0x18 |
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#define PTN5150_REG_INT_REG_STATUS 0x19 |
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#define PTN5150_REG_END PTN5150_REG_INT_REG_STATUS |
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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_VERSION GENMASK(7, 3) |
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#define PTN5150_REG_DEVICE_ID_VENDOR GENMASK(2, 0) |
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#define PTN5150_REG_CC_PORT_ATTACHMENT GENMASK(4, 2) |
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#define PTN5150_REG_CC_VBUS_DETECTION BIT(7) |
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#define PTN5150_REG_INT_CABLE_ATTACH_MASK BIT(0) |
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#define PTN5150_REG_INT_CABLE_DETACH_MASK BIT(1) |
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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_check_state(struct ptn5150_info *info) |
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{ |
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unsigned int port_status, reg_data, vbus; |
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int ret; |
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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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return; |
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} |
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port_status = FIELD_GET(PTN5150_REG_CC_PORT_ATTACHMENT, reg_data); |
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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, EXTCON_USB_HOST, false); |
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gpiod_set_value_cansleep(info->vbus_gpiod, 0); |
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extcon_set_state_sync(info->edev, EXTCON_USB, 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, false); |
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vbus = FIELD_GET(PTN5150_REG_CC_VBUS_DETECTION, reg_data); |
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if (vbus) |
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gpiod_set_value_cansleep(info->vbus_gpiod, 0); |
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else |
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gpiod_set_value_cansleep(info->vbus_gpiod, 1); |
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extcon_set_state_sync(info->edev, EXTCON_USB_HOST, true); |
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break; |
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default: |
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break; |
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} |
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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 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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/* 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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ptn5150_check_state(info); |
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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_cansleep(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 = FIELD_GET(PTN5150_REG_DEVICE_ID_VENDOR, reg_data); |
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version_id = FIELD_GET(PTN5150_REG_DEVICE_ID_VERSION, reg_data); |
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dev_dbg(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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{ |
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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->vbus_gpiod = devm_gpiod_get(&i2c->dev, "vbus", GPIOD_OUT_LOW); |
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if (IS_ERR(info->vbus_gpiod)) { |
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ret = PTR_ERR(info->vbus_gpiod); |
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if (ret == -ENOENT) { |
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dev_info(dev, "No VBUS GPIO, ignoring VBUS control\n"); |
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info->vbus_gpiod = NULL; |
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} else { |
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return dev_err_probe(dev, ret, "failed to get VBUS GPIO\n"); |
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} |
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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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return dev_err_probe(info->dev, PTR_ERR(info->regmap), |
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"failed to allocate register map\n"); |
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} |
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if (i2c->irq > 0) { |
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info->irq = i2c->irq; |
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} else { |
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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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return dev_err_probe(dev, PTR_ERR(info->int_gpiod), |
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"failed to get INT GPIO\n"); |
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} |
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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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} |
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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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/* 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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extcon_set_property_capability(info->edev, EXTCON_USB, |
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EXTCON_PROP_USB_VBUS); |
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extcon_set_property_capability(info->edev, EXTCON_USB_HOST, |
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EXTCON_PROP_USB_VBUS); |
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extcon_set_property_capability(info->edev, EXTCON_USB_HOST, |
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EXTCON_PROP_USB_TYPEC_POLARITY); |
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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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/* |
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* Update current extcon state if for example OTG connection was there |
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* before the probe |
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*/ |
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mutex_lock(&info->mutex); |
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ptn5150_check_state(info); |
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mutex_unlock(&info->mutex); |
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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_new = ptn5150_i2c_probe, |
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.id_table = ptn5150_i2c_id, |
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}; |
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module_i2c_driver(ptn5150_i2c_driver); |
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MODULE_DESCRIPTION("NXP PTN5150 CC logic Extcon driver"); |
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MODULE_AUTHOR("Vijai Kumar K <[email protected]>"); |
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MODULE_AUTHOR("Krzysztof Kozlowski <[email protected]>"); |
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MODULE_LICENSE("GPL v2");
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