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
  21 /* PTN5150 registers */
  22 #define PTN5150_REG_DEVICE_ID                   0x01
  23 #define PTN5150_REG_CONTROL                     0x02
  24 #define PTN5150_REG_INT_STATUS                  0x03
  25 #define PTN5150_REG_CC_STATUS                   0x04
  26 #define PTN5150_REG_CON_DET                     0x09
  27 #define PTN5150_REG_VCONN_STATUS                0x0a
  28 #define PTN5150_REG_RESET                       0x0b
  29 #define PTN5150_REG_INT_MASK                    0x18
  30 #define PTN5150_REG_INT_REG_STATUS              0x19
  31 #define PTN5150_REG_END                         PTN5150_REG_INT_REG_STATUS
  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_VERSION           GENMASK(7, 3)
  38 #define PTN5150_REG_DEVICE_ID_VENDOR            GENMASK(2, 0)
  39
  40 #define PTN5150_REG_CC_PORT_ATTACHMENT          GENMASK(4, 2)
  41 #define PTN5150_REG_CC_VBUS_DETECTION           BIT(7)
  42 #define PTN5150_REG_INT_CABLE_ATTACH_MASK       BIT(0)
  43 #define PTN5150_REG_INT_CABLE_DETACH_MASK       BIT(1)
  44
  45 struct ptn5150_info {
  46         struct device *dev;
  47         struct extcon_dev *edev;
  48         struct i2c_client *i2c;
  49         struct regmap *regmap;
  50         struct gpio_desc *int_gpiod;
  51         struct gpio_desc *vbus_gpiod;
  52         int irq;
  53         struct work_struct irq_work;
  54         struct mutex mutex;
  55 };
  56
  57 /* List of detectable cables */
  58 static const unsigned int ptn5150_extcon_cable[] = {
  59         EXTCON_USB,
  60         EXTCON_USB_HOST,
  61         EXTCON_NONE,
  62 };
  63
  64 static const struct regmap_config ptn5150_regmap_config = {
  65         .reg_bits       = 8,
  66         .val_bits       = 8,
  67         .max_register   = PTN5150_REG_END,
  68 };
  69
  70 static void ptn5150_check_state(struct ptn5150_info *info)
  71 {
  72         unsigned int port_status, reg_data, vbus;
  73         int ret;
  74
  75         ret = regmap_read(info->regmap, PTN5150_REG_CC_STATUS, &reg_data);
  76         if (ret) {
  77                 dev_err(info->dev, "failed to read CC STATUS %d\n", ret);
  78                 return;
  79         }
  80
  81         port_status = FIELD_GET(PTN5150_REG_CC_PORT_ATTACHMENT, reg_data);
  82
  83         switch (port_status) {
  84         case PTN5150_DFP_ATTACHED:
  85                 extcon_set_state_sync(info->edev, EXTCON_USB_HOST, false);
  86                 gpiod_set_value_cansleep(info->vbus_gpiod, 0);
  87                 extcon_set_state_sync(info->edev, EXTCON_USB, true);
  88                 break;
  89         case PTN5150_UFP_ATTACHED:
  90                 extcon_set_state_sync(info->edev, EXTCON_USB, false);
  91                 vbus = FIELD_GET(PTN5150_REG_CC_VBUS_DETECTION, reg_data);
  92                 if (vbus)
  93                         gpiod_set_value_cansleep(info->vbus_gpiod, 0);
  94                 else
  95                         gpiod_set_value_cansleep(info->vbus_gpiod, 1);
  96
  97                 extcon_set_state_sync(info->edev, EXTCON_USB_HOST, true);
  98                 break;
  99         default:
 100                 break;
 101         }
 102 }
 103
 104 static void ptn5150_irq_work(struct work_struct *work)
 105 {
 106         struct ptn5150_info *info = container_of(work,
 107                         struct ptn5150_info, irq_work);
 108         int ret = 0;
 109         unsigned int int_status;
 110
 111         if (!info->edev)
 112                 return;
 113
 114         mutex_lock(&info->mutex);
 115
 116         /* Clear interrupt. Read would clear the register */
 117         ret = regmap_read(info->regmap, PTN5150_REG_INT_STATUS, &int_status);
 118         if (ret) {
 119                 dev_err(info->dev, "failed to read INT STATUS %d\n", ret);
 120                 mutex_unlock(&info->mutex);
 121                 return;
 122         }
 123
 124         if (int_status) {
 125                 unsigned int cable_attach;
 126
 127                 cable_attach = int_status & PTN5150_REG_INT_CABLE_ATTACH_MASK;
 128                 if (cable_attach) {
 129                         ptn5150_check_state(info);
 130                 } else {
 131                         extcon_set_state_sync(info->edev,
 132                                         EXTCON_USB_HOST, false);
 133                         extcon_set_state_sync(info->edev,
 134                                         EXTCON_USB, false);
 135                         gpiod_set_value_cansleep(info->vbus_gpiod, 0);
 136                 }
 137         }
 138
 139         /* Clear interrupt. Read would clear the register */
 140         ret = regmap_read(info->regmap, PTN5150_REG_INT_REG_STATUS,
 141                         &int_status);
 142         if (ret) {
 143                 dev_err(info->dev,
 144                         "failed to read INT REG STATUS %d\n", ret);
 145                 mutex_unlock(&info->mutex);
 146                 return;
 147         }
 148
 149         mutex_unlock(&info->mutex);
 150 }
 151
 152
 153 static irqreturn_t ptn5150_irq_handler(int irq, void *data)
 154 {
 155         struct ptn5150_info *info = data;
 156
 157         schedule_work(&info->irq_work);
 158
 159         return IRQ_HANDLED;
 160 }
 161
 162 static int ptn5150_init_dev_type(struct ptn5150_info *info)
 163 {
 164         unsigned int reg_data, vendor_id, version_id;
 165         int ret;
 166
 167         ret = regmap_read(info->regmap, PTN5150_REG_DEVICE_ID, &reg_data);
 168         if (ret) {
 169                 dev_err(info->dev, "failed to read DEVICE_ID %d\n", ret);
 170                 return -EINVAL;
 171         }
 172
 173         vendor_id = FIELD_GET(PTN5150_REG_DEVICE_ID_VENDOR, reg_data);
 174         version_id = FIELD_GET(PTN5150_REG_DEVICE_ID_VERSION, reg_data);
 175         dev_dbg(info->dev, "Device type: version: 0x%x, vendor: 0x%x\n",
 176                 version_id, vendor_id);
 177
 178         /* Clear any existing interrupts */
 179         ret = regmap_read(info->regmap, PTN5150_REG_INT_STATUS, &reg_data);
 180         if (ret) {
 181                 dev_err(info->dev,
 182                         "failed to read PTN5150_REG_INT_STATUS %d\n",
 183                         ret);
 184                 return -EINVAL;
 185         }
 186
 187         ret = regmap_read(info->regmap, PTN5150_REG_INT_REG_STATUS, &reg_data);
 188         if (ret) {
 189                 dev_err(info->dev,
 190                         "failed to read PTN5150_REG_INT_REG_STATUS %d\n", ret);
 191                 return -EINVAL;
 192         }
 193
 194         return 0;
 195 }
 196
 197 static int ptn5150_i2c_probe(struct i2c_client *i2c)
 198 {
 199         struct device *dev = &i2c->dev;
 200         struct device_node *np = i2c->dev.of_node;
 201         struct ptn5150_info *info;
 202         int ret;
 203
 204         if (!np)
 205                 return -EINVAL;
 206
 207         info = devm_kzalloc(&i2c->dev, sizeof(*info), GFP_KERNEL);
 208         if (!info)
 209                 return -ENOMEM;
 210         i2c_set_clientdata(i2c, info);
 211
 212         info->dev = &i2c->dev;
 213         info->i2c = i2c;
 214         info->vbus_gpiod = devm_gpiod_get(&i2c->dev, "vbus", GPIOD_OUT_LOW);
 215         if (IS_ERR(info->vbus_gpiod)) {
 216                 ret = PTR_ERR(info->vbus_gpiod);
 217                 if (ret == -ENOENT) {
 218                         dev_info(dev, "No VBUS GPIO, ignoring VBUS control\n");
 219                         info->vbus_gpiod = NULL;
 220                 } else {
 221                         return dev_err_probe(dev, ret, "failed to get VBUS GPIO\n");
 222                 }
 223         }
 224
 225         mutex_init(&info->mutex);
 226
 227         INIT_WORK(&info->irq_work, ptn5150_irq_work);
 228
 229         info->regmap = devm_regmap_init_i2c(i2c, &ptn5150_regmap_config);
 230         if (IS_ERR(info->regmap)) {
 231                 return dev_err_probe(info->dev, PTR_ERR(info->regmap),
 232                                      "failed to allocate register map\n");
 233         }
 234
 235         if (i2c->irq > 0) {
 236                 info->irq = i2c->irq;
 237         } else {
 238                 info->int_gpiod = devm_gpiod_get(&i2c->dev, "int", GPIOD_IN);
 239                 if (IS_ERR(info->int_gpiod)) {
 240                         return dev_err_probe(dev, PTR_ERR(info->int_gpiod),
 241                                              "failed to get INT GPIO\n");
 242                 }
 243
 244                 info->irq = gpiod_to_irq(info->int_gpiod);
 245                 if (info->irq < 0) {
 246                         dev_err(dev, "failed to get INTB IRQ\n");
 247                         return info->irq;
 248                 }
 249         }
 250
 251         ret = devm_request_threaded_irq(dev, info->irq, NULL,
 252                                         ptn5150_irq_handler,
 253                                         IRQF_TRIGGER_FALLING |
 254                                         IRQF_ONESHOT,
 255                                         i2c->name, info);
 256         if (ret < 0) {
 257                 dev_err(dev, "failed to request handler for INTB IRQ\n");
 258                 return ret;
 259         }
 260
 261         /* Allocate extcon device */
 262         info->edev = devm_extcon_dev_allocate(info->dev, ptn5150_extcon_cable);
 263         if (IS_ERR(info->edev)) {
 264                 dev_err(info->dev, "failed to allocate memory for extcon\n");
 265                 return -ENOMEM;
 266         }
 267
 268         /* Register extcon device */
 269         ret = devm_extcon_dev_register(info->dev, info->edev);
 270         if (ret) {
 271                 dev_err(info->dev, "failed to register extcon device\n");
 272                 return ret;
 273         }
 274
 275         extcon_set_property_capability(info->edev, EXTCON_USB,
 276                                         EXTCON_PROP_USB_VBUS);
 277         extcon_set_property_capability(info->edev, EXTCON_USB_HOST,
 278                                         EXTCON_PROP_USB_VBUS);
 279         extcon_set_property_capability(info->edev, EXTCON_USB_HOST,
 280                                         EXTCON_PROP_USB_TYPEC_POLARITY);
 281
 282         /* Initialize PTN5150 device and print vendor id and version id */
 283         ret = ptn5150_init_dev_type(info);
 284         if (ret)
 285                 return -EINVAL;
 286
 287         /*
 288          * Update current extcon state if for example OTG connection was there
 289          * before the probe
 290          */
 291         mutex_lock(&info->mutex);
 292         ptn5150_check_state(info);
 293         mutex_unlock(&info->mutex);
 294
 295         return 0;
 296 }
 297
 298 static const struct of_device_id ptn5150_dt_match[] = {
 299         { .compatible = "nxp,ptn5150" },
 300         { },
 301 };
 302 MODULE_DEVICE_TABLE(of, ptn5150_dt_match);
 303
 304 static const struct i2c_device_id ptn5150_i2c_id[] = {
 305         { "ptn5150", 0 },
 306         { }
 307 };
 308 MODULE_DEVICE_TABLE(i2c, ptn5150_i2c_id);
 309
 310 static struct i2c_driver ptn5150_i2c_driver = {
 311         .driver         = {
 312                 .name   = "ptn5150",
 313                 .of_match_table = ptn5150_dt_match,
 314         },
 315         .probe_new      = ptn5150_i2c_probe,
 316         .id_table = ptn5150_i2c_id,
 317 };
 318 module_i2c_driver(ptn5150_i2c_driver);
 319
 320 MODULE_DESCRIPTION("NXP PTN5150 CC logic Extcon driver");
 321 MODULE_AUTHOR("Vijai Kumar K <vijaikumar.kanagarajan@gmail.com>");
 322 MODULE_AUTHOR("Krzysztof Kozlowski <krzk@kernel.org>");
 323 MODULE_LICENSE("GPL v2");