// 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 // Copyright (c) 2020 Krzysztof Kozlowski #include #include #include #include #include #include #include #include #include /* 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_check_state(struct ptn5150_info *info) { unsigned int port_status, reg_data, vbus; int ret; ret = regmap_read(info->regmap, PTN5150_REG_CC_STATUS, ®_data); if (ret) { dev_err(info->dev, "failed to read CC STATUS %d\n", ret); return; } 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_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 = ((reg_data & PTN5150_REG_CC_VBUS_DETECTION_MASK) >> PTN5150_REG_CC_VBUS_DETECTION_SHIFT); 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: dev_err(info->dev, "Unknown Port status : %x\n", port_status); 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, ®_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_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, ®_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, ®_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 { dev_err_probe(dev, ret, "failed to get VBUS GPIO\n"); return ret; } } 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_probe(info->dev, ret, "failed to allocate register map: %d\n", ret); return ret; } 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)) { ret = PTR_ERR(info->int_gpiod); dev_err_probe(dev, ret, "failed to get INT GPIO\n"); return ret; } 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; /* * 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 "); MODULE_AUTHOR("Krzysztof Kozlowski "); MODULE_LICENSE("GPL v2");