drivers/extcon/extcon-ptn5150.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 //
   3 // extcon-ptn5150.c - PTN5150 CC logic extcon driver to support USB detection
   4 //
   5 // Based on extcon-sm5502.c driver
   6 // Copyright (c) 2018-2019 by Vijai Kumar K
   7 // Author: Vijai Kumar K <vijaikumar.kanagarajan@gmail.com>
   8
   9 #include <linux/err.h>
  10 #include <linux/i2c.h>
  11 #include <linux/interrupt.h>
  12 #include <linux/kernel.h>
  13 #include <linux/module.h>
  14 #include <linux/regmap.h>
  15 #include <linux/slab.h>
  16 #include <linux/extcon-provider.h>
  17 #include <linux/gpio/consumer.h>
  18
  19 /* PTN5150 registers */
  20 enum ptn5150_reg {
  21         PTN5150_REG_DEVICE_ID = 0x01,
  22         PTN5150_REG_CONTROL,
  23         PTN5150_REG_INT_STATUS,
  24         PTN5150_REG_CC_STATUS,
  25         PTN5150_REG_CON_DET = 0x09,
  26         PTN5150_REG_VCONN_STATUS,
  27         PTN5150_REG_RESET,
  28         PTN5150_REG_INT_MASK = 0x18,
  29         PTN5150_REG_INT_REG_STATUS,
  30         PTN5150_REG_END,
  31 };
  32
  33 #define PTN5150_DFP_ATTACHED                    0x1
  34 #define PTN5150_UFP_ATTACHED                    0x2
  35
  36 /* Define PTN5150 MASK/SHIFT constant */
  37 #define PTN5150_REG_DEVICE_ID_VENDOR_SHIFT      0
  38 #define PTN5150_REG_DEVICE_ID_VENDOR_MASK       \
  39         (0x3 << PTN5150_REG_DEVICE_ID_VENDOR_SHIFT)
  40
  41 #define PTN5150_REG_DEVICE_ID_VERSION_SHIFT     3
  42 #define PTN5150_REG_DEVICE_ID_VERSION_MASK      \
  43         (0x1f << PTN5150_REG_DEVICE_ID_VERSION_SHIFT)
  44
  45 #define PTN5150_REG_CC_PORT_ATTACHMENT_SHIFT    2
  46 #define PTN5150_REG_CC_PORT_ATTACHMENT_MASK     \
  47         (0x7 << PTN5150_REG_CC_PORT_ATTACHMENT_SHIFT)
  48
  49 #define PTN5150_REG_CC_VBUS_DETECTION_SHIFT     7
  50 #define PTN5150_REG_CC_VBUS_DETECTION_MASK      \
  51         (0x1 << PTN5150_REG_CC_VBUS_DETECTION_SHIFT)
  52
  53 #define PTN5150_REG_INT_CABLE_ATTACH_SHIFT      0
  54 #define PTN5150_REG_INT_CABLE_ATTACH_MASK       \
  55         (0x1 << PTN5150_REG_INT_CABLE_ATTACH_SHIFT)
  56
  57 #define PTN5150_REG_INT_CABLE_DETACH_SHIFT      1
  58 #define PTN5150_REG_INT_CABLE_DETACH_MASK       \
  59         (0x1 << PTN5150_REG_CC_CABLE_DETACH_SHIFT)
  60
  61 struct ptn5150_info {
  62         struct device *dev;
  63         struct extcon_dev *edev;
  64         struct i2c_client *i2c;
  65         struct regmap *regmap;
  66         struct gpio_desc *int_gpiod;
  67         struct gpio_desc *vbus_gpiod;
  68         int irq;
  69         struct work_struct irq_work;
  70         struct mutex mutex;
  71 };
  72
  73 /* List of detectable cables */
  74 static const unsigned int ptn5150_extcon_cable[] = {
  75         EXTCON_USB,
  76         EXTCON_USB_HOST,
  77         EXTCON_NONE,
  78 };
  79
  80 static const struct regmap_config ptn5150_regmap_config = {
  81         .reg_bits       = 8,
  82         .val_bits       = 8,
  83         .max_register   = PTN5150_REG_END,
  84 };
  85
  86 static void ptn5150_irq_work(struct work_struct *work)
  87 {
  88         struct ptn5150_info *info = container_of(work,
  89                         struct ptn5150_info, irq_work);
  90         int ret = 0;
  91         unsigned int reg_data;
  92         unsigned int int_status;
  93
  94         if (!info->edev)
  95                 return;
  96
  97         mutex_lock(&info->mutex);
  98
  99         ret = regmap_read(info->regmap, PTN5150_REG_CC_STATUS, &reg_data);
 100         if (ret) {
 101                 dev_err(info->dev, "failed to read CC STATUS %d\n", ret);
 102                 mutex_unlock(&info->mutex);
 103                 return;
 104         }
 105
 106         /* Clear interrupt. Read would clear the register */
 107         ret = regmap_read(info->regmap, PTN5150_REG_INT_STATUS, &int_status);
 108         if (ret) {
 109                 dev_err(info->dev, "failed to read INT STATUS %d\n", ret);
 110                 mutex_unlock(&info->mutex);
 111                 return;
 112         }
 113
 114         if (int_status) {
 115                 unsigned int cable_attach;
 116
 117                 cable_attach = int_status & PTN5150_REG_INT_CABLE_ATTACH_MASK;
 118                 if (cable_attach) {
 119                         unsigned int port_status;
 120                         unsigned int vbus;
 121
 122                         port_status = ((reg_data &
 123                                         PTN5150_REG_CC_PORT_ATTACHMENT_MASK) >>
 124                                         PTN5150_REG_CC_PORT_ATTACHMENT_SHIFT);
 125
 126                         switch (port_status) {
 127                         case PTN5150_DFP_ATTACHED:
 128                                 extcon_set_state_sync(info->edev,
 129                                                 EXTCON_USB_HOST, false);
 130                                 gpiod_set_value(info->vbus_gpiod, 0);
 131                                 extcon_set_state_sync(info->edev, EXTCON_USB,
 132                                                 true);
 133                                 break;
 134                         case PTN5150_UFP_ATTACHED:
 135                                 extcon_set_state_sync(info->edev, EXTCON_USB,
 136                                                 false);
 137                                 vbus = ((reg_data &
 138                                         PTN5150_REG_CC_VBUS_DETECTION_MASK) >>
 139                                         PTN5150_REG_CC_VBUS_DETECTION_SHIFT);
 140                                 if (vbus)
 141                                         gpiod_set_value(info->vbus_gpiod, 0);
 142                                 else
 143                                         gpiod_set_value(info->vbus_gpiod, 1);
 144
 145                                 extcon_set_state_sync(info->edev,
 146                                                 EXTCON_USB_HOST, true);
 147                                 break;
 148                         default:
 149                                 dev_err(info->dev,
 150                                         "Unknown Port status : %x\n",
 151                                         port_status);
 152                                 break;
 153                         }
 154                 } else {
 155                         extcon_set_state_sync(info->edev,
 156                                         EXTCON_USB_HOST, false);
 157                         extcon_set_state_sync(info->edev,
 158                                         EXTCON_USB, false);
 159                         gpiod_set_value(info->vbus_gpiod, 0);
 160                 }
 161         }
 162
 163         /* Clear interrupt. Read would clear the register */
 164         ret = regmap_read(info->regmap, PTN5150_REG_INT_REG_STATUS,
 165                         &int_status);
 166         if (ret) {
 167                 dev_err(info->dev,
 168                         "failed to read INT REG STATUS %d\n", ret);
 169                 mutex_unlock(&info->mutex);
 170                 return;
 171         }
 172
 173         mutex_unlock(&info->mutex);
 174 }
 175
 176
 177 static irqreturn_t ptn5150_irq_handler(int irq, void *data)
 178 {
 179         struct ptn5150_info *info = data;
 180
 181         schedule_work(&info->irq_work);
 182
 183         return IRQ_HANDLED;
 184 }
 185
 186 static int ptn5150_init_dev_type(struct ptn5150_info *info)
 187 {
 188         unsigned int reg_data, vendor_id, version_id;
 189         int ret;
 190
 191         ret = regmap_read(info->regmap, PTN5150_REG_DEVICE_ID, &reg_data);
 192         if (ret) {
 193                 dev_err(info->dev, "failed to read DEVICE_ID %d\n", ret);
 194                 return -EINVAL;
 195         }
 196
 197         vendor_id = ((reg_data & PTN5150_REG_DEVICE_ID_VENDOR_MASK) >>
 198                                 PTN5150_REG_DEVICE_ID_VENDOR_SHIFT);
 199         version_id = ((reg_data & PTN5150_REG_DEVICE_ID_VERSION_MASK) >>
 200                                 PTN5150_REG_DEVICE_ID_VERSION_SHIFT);
 201
 202         dev_info(info->dev, "Device type: version: 0x%x, vendor: 0x%x\n",
 203                             version_id, vendor_id);
 204
 205         /* Clear any existing interrupts */
 206         ret = regmap_read(info->regmap, PTN5150_REG_INT_STATUS, &reg_data);
 207         if (ret) {
 208                 dev_err(info->dev,
 209                         "failed to read PTN5150_REG_INT_STATUS %d\n",
 210                         ret);
 211                 return -EINVAL;
 212         }
 213
 214         ret = regmap_read(info->regmap, PTN5150_REG_INT_REG_STATUS, &reg_data);
 215         if (ret) {
 216                 dev_err(info->dev,
 217                         "failed to read PTN5150_REG_INT_REG_STATUS %d\n", ret);
 218                 return -EINVAL;
 219         }
 220
 221         return 0;
 222 }
 223
 224 static int ptn5150_i2c_probe(struct i2c_client *i2c,
 225                                  const struct i2c_device_id *id)
 226 {
 227         struct device *dev = &i2c->dev;
 228         struct device_node *np = i2c->dev.of_node;
 229         struct ptn5150_info *info;
 230         int ret;
 231
 232         if (!np)
 233                 return -EINVAL;
 234
 235         info = devm_kzalloc(&i2c->dev, sizeof(*info), GFP_KERNEL);
 236         if (!info)
 237                 return -ENOMEM;
 238         i2c_set_clientdata(i2c, info);
 239
 240         info->dev = &i2c->dev;
 241         info->i2c = i2c;
 242         info->int_gpiod = devm_gpiod_get(&i2c->dev, "int", GPIOD_IN);
 243         if (IS_ERR(info->int_gpiod)) {
 244                 dev_err(dev, "failed to get INT GPIO\n");
 245                 return PTR_ERR(info->int_gpiod);
 246         }
 247         info->vbus_gpiod = devm_gpiod_get(&i2c->dev, "vbus", GPIOD_IN);
 248         if (IS_ERR(info->vbus_gpiod)) {
 249                 dev_err(dev, "failed to get VBUS GPIO\n");
 250                 return PTR_ERR(info->vbus_gpiod);
 251         }
 252         ret = gpiod_direction_output(info->vbus_gpiod, 0);
 253         if (ret) {
 254                 dev_err(dev, "failed to set VBUS GPIO direction\n");
 255                 return -EINVAL;
 256         }
 257
 258         mutex_init(&info->mutex);
 259
 260         INIT_WORK(&info->irq_work, ptn5150_irq_work);
 261
 262         info->regmap = devm_regmap_init_i2c(i2c, &ptn5150_regmap_config);
 263         if (IS_ERR(info->regmap)) {
 264                 ret = PTR_ERR(info->regmap);
 265                 dev_err(info->dev, "failed to allocate register map: %d\n",
 266                                    ret);
 267                 return ret;
 268         }
 269
 270         if (info->int_gpiod) {
 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                 ret = devm_request_threaded_irq(dev, info->irq, NULL,
 278                                                 ptn5150_irq_handler,
 279                                                 IRQF_TRIGGER_FALLING |
 280                                                 IRQF_ONESHOT,
 281                                                 i2c->name, info);
 282                 if (ret < 0) {
 283                         dev_err(dev, "failed to request handler for INTB IRQ\n");
 284                         return ret;
 285                 }
 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         /* Initialize PTN5150 device and print vendor id and version id */
 303         ret = ptn5150_init_dev_type(info);
 304         if (ret)
 305                 return -EINVAL;
 306
 307         return 0;
 308 }
 309
 310 static const struct of_device_id ptn5150_dt_match[] = {
 311         { .compatible = "nxp,ptn5150" },
 312         { },
 313 };
 314 MODULE_DEVICE_TABLE(of, ptn5150_dt_match);
 315
 316 static const struct i2c_device_id ptn5150_i2c_id[] = {
 317         { "ptn5150", 0 },
 318         { }
 319 };
 320 MODULE_DEVICE_TABLE(i2c, ptn5150_i2c_id);
 321
 322 static struct i2c_driver ptn5150_i2c_driver = {
 323         .driver         = {
 324                 .name   = "ptn5150",
 325                 .of_match_table = ptn5150_dt_match,
 326         },
 327         .probe  = ptn5150_i2c_probe,
 328         .id_table = ptn5150_i2c_id,
 329 };
 330
 331 static int __init ptn5150_i2c_init(void)
 332 {
 333         return i2c_add_driver(&ptn5150_i2c_driver);
 334 }
 335 subsys_initcall(ptn5150_i2c_init);
 336
 337 MODULE_DESCRIPTION("NXP PTN5150 CC logic Extcon driver");
 338 MODULE_AUTHOR("Vijai Kumar K <vijaikumar.kanagarajan@gmail.com>");
 339 MODULE_LICENSE("GPL v2");