360 lines · c
1// SPDX-License-Identifier: GPL-2.0+2//3// extcon-ptn5150.c - PTN5150 CC logic extcon driver to support USB detection4//5// Based on extcon-sm5502.c driver6// Copyright (c) 2018-2019 by Vijai Kumar K7// Author: Vijai Kumar K <vijaikumar.kanagarajan@gmail.com>8// Copyright (c) 2020 Krzysztof Kozlowski <krzk@kernel.org>9 10#include <linux/bitfield.h>11#include <linux/err.h>12#include <linux/i2c.h>13#include <linux/interrupt.h>14#include <linux/kernel.h>15#include <linux/module.h>16#include <linux/regmap.h>17#include <linux/slab.h>18#include <linux/extcon-provider.h>19#include <linux/gpio/consumer.h>20#include <linux/usb/role.h>21 22/* PTN5150 registers */23#define PTN5150_REG_DEVICE_ID 0x0124#define PTN5150_REG_CONTROL 0x0225#define PTN5150_REG_INT_STATUS 0x0326#define PTN5150_REG_CC_STATUS 0x0427#define PTN5150_REG_CON_DET 0x0928#define PTN5150_REG_VCONN_STATUS 0x0a29#define PTN5150_REG_RESET 0x0b30#define PTN5150_REG_INT_MASK 0x1831#define PTN5150_REG_INT_REG_STATUS 0x1932#define PTN5150_REG_END PTN5150_REG_INT_REG_STATUS33 34#define PTN5150_DFP_ATTACHED 0x135#define PTN5150_UFP_ATTACHED 0x236 37/* Define PTN5150 MASK/SHIFT constant */38#define PTN5150_REG_DEVICE_ID_VERSION GENMASK(7, 3)39#define PTN5150_REG_DEVICE_ID_VENDOR GENMASK(2, 0)40 41#define PTN5150_REG_CC_PORT_ATTACHMENT GENMASK(4, 2)42#define PTN5150_REG_CC_VBUS_DETECTION BIT(7)43#define PTN5150_REG_INT_CABLE_ATTACH_MASK BIT(0)44#define PTN5150_REG_INT_CABLE_DETACH_MASK BIT(1)45 46struct ptn5150_info {47 struct device *dev;48 struct extcon_dev *edev;49 struct i2c_client *i2c;50 struct regmap *regmap;51 struct gpio_desc *int_gpiod;52 struct gpio_desc *vbus_gpiod;53 int irq;54 struct work_struct irq_work;55 struct mutex mutex;56 struct usb_role_switch *role_sw;57};58 59/* List of detectable cables */60static const unsigned int ptn5150_extcon_cable[] = {61 EXTCON_USB,62 EXTCON_USB_HOST,63 EXTCON_NONE,64};65 66static const struct regmap_config ptn5150_regmap_config = {67 .reg_bits = 8,68 .val_bits = 8,69 .max_register = PTN5150_REG_END,70};71 72static void ptn5150_check_state(struct ptn5150_info *info)73{74 unsigned int port_status, reg_data, vbus;75 enum usb_role usb_role = USB_ROLE_NONE;76 int ret;77 78 ret = regmap_read(info->regmap, PTN5150_REG_CC_STATUS, ®_data);79 if (ret) {80 dev_err(info->dev, "failed to read CC STATUS %d\n", ret);81 return;82 }83 84 port_status = FIELD_GET(PTN5150_REG_CC_PORT_ATTACHMENT, reg_data);85 86 switch (port_status) {87 case PTN5150_DFP_ATTACHED:88 extcon_set_state_sync(info->edev, EXTCON_USB_HOST, false);89 gpiod_set_value_cansleep(info->vbus_gpiod, 0);90 extcon_set_state_sync(info->edev, EXTCON_USB, true);91 usb_role = USB_ROLE_DEVICE;92 break;93 case PTN5150_UFP_ATTACHED:94 extcon_set_state_sync(info->edev, EXTCON_USB, false);95 vbus = FIELD_GET(PTN5150_REG_CC_VBUS_DETECTION, reg_data);96 if (vbus)97 gpiod_set_value_cansleep(info->vbus_gpiod, 0);98 else99 gpiod_set_value_cansleep(info->vbus_gpiod, 1);100 101 extcon_set_state_sync(info->edev, EXTCON_USB_HOST, true);102 usb_role = USB_ROLE_HOST;103 break;104 default:105 break;106 }107 108 if (usb_role) {109 ret = usb_role_switch_set_role(info->role_sw, usb_role);110 if (ret)111 dev_err(info->dev, "failed to set %s role: %d\n",112 usb_role_string(usb_role), ret);113 }114}115 116static void ptn5150_irq_work(struct work_struct *work)117{118 struct ptn5150_info *info = container_of(work,119 struct ptn5150_info, irq_work);120 int ret = 0;121 unsigned int int_status;122 123 if (!info->edev)124 return;125 126 mutex_lock(&info->mutex);127 128 /* Clear interrupt. Read would clear the register */129 ret = regmap_read(info->regmap, PTN5150_REG_INT_STATUS, &int_status);130 if (ret) {131 dev_err(info->dev, "failed to read INT STATUS %d\n", ret);132 mutex_unlock(&info->mutex);133 return;134 }135 136 if (int_status) {137 unsigned int cable_attach;138 139 cable_attach = int_status & PTN5150_REG_INT_CABLE_ATTACH_MASK;140 if (cable_attach) {141 ptn5150_check_state(info);142 } else {143 extcon_set_state_sync(info->edev,144 EXTCON_USB_HOST, false);145 extcon_set_state_sync(info->edev,146 EXTCON_USB, false);147 gpiod_set_value_cansleep(info->vbus_gpiod, 0);148 149 ret = usb_role_switch_set_role(info->role_sw,150 USB_ROLE_NONE);151 if (ret)152 dev_err(info->dev,153 "failed to set none role: %d\n",154 ret);155 }156 }157 158 /* Clear interrupt. Read would clear the register */159 ret = regmap_read(info->regmap, PTN5150_REG_INT_REG_STATUS,160 &int_status);161 if (ret) {162 dev_err(info->dev,163 "failed to read INT REG STATUS %d\n", ret);164 mutex_unlock(&info->mutex);165 return;166 }167 168 mutex_unlock(&info->mutex);169}170 171 172static irqreturn_t ptn5150_irq_handler(int irq, void *data)173{174 struct ptn5150_info *info = data;175 176 schedule_work(&info->irq_work);177 178 return IRQ_HANDLED;179}180 181static int ptn5150_init_dev_type(struct ptn5150_info *info)182{183 unsigned int reg_data, vendor_id, version_id;184 int ret;185 186 ret = regmap_read(info->regmap, PTN5150_REG_DEVICE_ID, ®_data);187 if (ret) {188 dev_err(info->dev, "failed to read DEVICE_ID %d\n", ret);189 return -EINVAL;190 }191 192 vendor_id = FIELD_GET(PTN5150_REG_DEVICE_ID_VENDOR, reg_data);193 version_id = FIELD_GET(PTN5150_REG_DEVICE_ID_VERSION, reg_data);194 dev_dbg(info->dev, "Device type: version: 0x%x, vendor: 0x%x\n",195 version_id, vendor_id);196 197 /* Clear any existing interrupts */198 ret = regmap_read(info->regmap, PTN5150_REG_INT_STATUS, ®_data);199 if (ret) {200 dev_err(info->dev,201 "failed to read PTN5150_REG_INT_STATUS %d\n",202 ret);203 return -EINVAL;204 }205 206 ret = regmap_read(info->regmap, PTN5150_REG_INT_REG_STATUS, ®_data);207 if (ret) {208 dev_err(info->dev,209 "failed to read PTN5150_REG_INT_REG_STATUS %d\n", ret);210 return -EINVAL;211 }212 213 return 0;214}215 216static void ptn5150_work_sync_and_put(void *data)217{218 struct ptn5150_info *info = data;219 220 cancel_work_sync(&info->irq_work);221 usb_role_switch_put(info->role_sw);222}223 224static int ptn5150_i2c_probe(struct i2c_client *i2c)225{226 struct device *dev = &i2c->dev;227 struct device_node *np = i2c->dev.of_node;228 struct ptn5150_info *info;229 int ret;230 231 if (!np)232 return -EINVAL;233 234 info = devm_kzalloc(&i2c->dev, sizeof(*info), GFP_KERNEL);235 if (!info)236 return -ENOMEM;237 i2c_set_clientdata(i2c, info);238 239 info->dev = &i2c->dev;240 info->i2c = i2c;241 info->vbus_gpiod = devm_gpiod_get(&i2c->dev, "vbus", GPIOD_OUT_LOW);242 if (IS_ERR(info->vbus_gpiod)) {243 ret = PTR_ERR(info->vbus_gpiod);244 if (ret == -ENOENT) {245 dev_info(dev, "No VBUS GPIO, ignoring VBUS control\n");246 info->vbus_gpiod = NULL;247 } else {248 return dev_err_probe(dev, ret, "failed to get VBUS GPIO\n");249 }250 }251 252 mutex_init(&info->mutex);253 254 INIT_WORK(&info->irq_work, ptn5150_irq_work);255 256 info->regmap = devm_regmap_init_i2c(i2c, &ptn5150_regmap_config);257 if (IS_ERR(info->regmap)) {258 return dev_err_probe(info->dev, PTR_ERR(info->regmap),259 "failed to allocate register map\n");260 }261 262 if (i2c->irq > 0) {263 info->irq = i2c->irq;264 } else {265 info->int_gpiod = devm_gpiod_get(&i2c->dev, "int", GPIOD_IN);266 if (IS_ERR(info->int_gpiod)) {267 return dev_err_probe(dev, PTR_ERR(info->int_gpiod),268 "failed to get INT GPIO\n");269 }270 271 info->irq = gpiod_to_irq(info->int_gpiod);272 if (info->irq < 0) {273 dev_err(dev, "failed to get INTB IRQ\n");274 return info->irq;275 }276 }277 278 ret = devm_request_threaded_irq(dev, info->irq, NULL,279 ptn5150_irq_handler,280 IRQF_TRIGGER_FALLING |281 IRQF_ONESHOT,282 i2c->name, info);283 if (ret < 0) {284 dev_err(dev, "failed to request handler for INTB IRQ\n");285 return ret;286 }287 288 /* Allocate extcon device */289 info->edev = devm_extcon_dev_allocate(info->dev, ptn5150_extcon_cable);290 if (IS_ERR(info->edev)) {291 dev_err(info->dev, "failed to allocate memory for extcon\n");292 return -ENOMEM;293 }294 295 /* Register extcon device */296 ret = devm_extcon_dev_register(info->dev, info->edev);297 if (ret) {298 dev_err(info->dev, "failed to register extcon device\n");299 return ret;300 }301 302 extcon_set_property_capability(info->edev, EXTCON_USB,303 EXTCON_PROP_USB_VBUS);304 extcon_set_property_capability(info->edev, EXTCON_USB_HOST,305 EXTCON_PROP_USB_VBUS);306 extcon_set_property_capability(info->edev, EXTCON_USB_HOST,307 EXTCON_PROP_USB_TYPEC_POLARITY);308 309 /* Initialize PTN5150 device and print vendor id and version id */310 ret = ptn5150_init_dev_type(info);311 if (ret)312 return -EINVAL;313 314 info->role_sw = usb_role_switch_get(info->dev);315 if (IS_ERR(info->role_sw))316 return dev_err_probe(info->dev, PTR_ERR(info->role_sw),317 "failed to get role switch\n");318 319 ret = devm_add_action_or_reset(dev, ptn5150_work_sync_and_put, info);320 if (ret)321 return ret;322 323 /*324 * Update current extcon state if for example OTG connection was there325 * before the probe326 */327 mutex_lock(&info->mutex);328 ptn5150_check_state(info);329 mutex_unlock(&info->mutex);330 331 return 0;332}333 334static const struct of_device_id ptn5150_dt_match[] = {335 { .compatible = "nxp,ptn5150" },336 { },337};338MODULE_DEVICE_TABLE(of, ptn5150_dt_match);339 340static const struct i2c_device_id ptn5150_i2c_id[] = {341 { "ptn5150", 0 },342 { }343};344MODULE_DEVICE_TABLE(i2c, ptn5150_i2c_id);345 346static struct i2c_driver ptn5150_i2c_driver = {347 .driver = {348 .name = "ptn5150",349 .of_match_table = ptn5150_dt_match,350 },351 .probe = ptn5150_i2c_probe,352 .id_table = ptn5150_i2c_id,353};354module_i2c_driver(ptn5150_i2c_driver);355 356MODULE_DESCRIPTION("NXP PTN5150 CC logic Extcon driver");357MODULE_AUTHOR("Vijai Kumar K <vijaikumar.kanagarajan@gmail.com>");358MODULE_AUTHOR("Krzysztof Kozlowski <krzk@kernel.org>");359MODULE_LICENSE("GPL v2");360