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 // 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                   0x01
  24 #define PTN5150_REG_CONTROL                     0x02
  25 #define PTN5150_REG_INT_STATUS                  0x03
  26 #define PTN5150_REG_CC_STATUS                   0x04
  27 #define PTN5150_REG_CON_DET                     0x09
  28 #define PTN5150_REG_VCONN_STATUS                0x0a
  29 #define PTN5150_REG_RESET                       0x0b
  30 #define PTN5150_REG_INT_MASK                    0x18
  31 #define PTN5150_REG_INT_REG_STATUS              0x19
  32 #define PTN5150_REG_END                         PTN5150_REG_INT_REG_STATUS
  33
  34 #define PTN5150_DFP_ATTACHED                    0x1
  35 #define PTN5150_UFP_ATTACHED                    0x2
  36
  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
  46 struct 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 */
  60 static const unsigned int ptn5150_extcon_cable[] = {
  61         EXTCON_USB,
  62         EXTCON_USB_HOST,
  63         EXTCON_NONE,
  64 };
  65
  66 static const struct regmap_config ptn5150_regmap_config = {
  67         .reg_bits       = 8,
  68         .val_bits       = 8,
  69         .max_register   = PTN5150_REG_END,
  70 };
  71
  72 static 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, &reg_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                 else
  99                         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
 116 static 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
 172 static 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
 181 static 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, &reg_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, &reg_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, &reg_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
 216 static 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
 224 static 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 there
 325          * before the probe
 326          */
 327         mutex_lock(&info->mutex);
 328         ptn5150_check_state(info);
 329         mutex_unlock(&info->mutex);
 330
 331         return 0;
 332 }
 333
 334 static const struct of_device_id ptn5150_dt_match[] = {
 335         { .compatible = "nxp,ptn5150" },
 336         { },
 337 };
 338 MODULE_DEVICE_TABLE(of, ptn5150_dt_match);
 339
 340 static const struct i2c_device_id ptn5150_i2c_id[] = {
 341         { "ptn5150", 0 },
 342         { }
 343 };
 344 MODULE_DEVICE_TABLE(i2c, ptn5150_i2c_id);
 345
 346 static 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 };
 354 module_i2c_driver(ptn5150_i2c_driver);
 355
 356 MODULE_DESCRIPTION("NXP PTN5150 CC logic Extcon driver");
 357 MODULE_AUTHOR("Vijai Kumar K <vijaikumar.kanagarajan@gmail.com>");
 358 MODULE_AUTHOR("Krzysztof Kozlowski <krzk@kernel.org>");
 359 MODULE_LICENSE("GPL v2");