drivers/extcon/extcon-palmas.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Palmas USB transceiver driver
   4  *
   5  * Copyright (C) 2013 Texas Instruments Incorporated - https://www.ti.com
   6  * Author: Graeme Gregory <gg@slimlogic.co.uk>
   7  * Author: Kishon Vijay Abraham I <kishon@ti.com>
   8  * Based on twl6030_usb.c
   9  * Author: Hema HK <hemahk@ti.com>
  10  */
  11
  12 #include <linux/devm-helpers.h>
  13 #include <linux/module.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/slab.h>
  17 #include <linux/err.h>
  18 #include <linux/mfd/palmas.h>
  19 #include <linux/of.h>
  20 #include <linux/of_platform.h>
  21 #include <linux/of_gpio.h>
  22 #include <linux/gpio/consumer.h>
  23 #include <linux/workqueue.h>
  24
  25 #define USB_GPIO_DEBOUNCE_MS    20      /* ms */
  26
  27 static const unsigned int palmas_extcon_cable[] = {
  28         EXTCON_USB,
  29         EXTCON_USB_HOST,
  30         EXTCON_NONE,
  31 };
  32
  33 static void palmas_usb_wakeup(struct palmas *palmas, int enable)
  34 {
  35         if (enable)
  36                 palmas_write(palmas, PALMAS_USB_OTG_BASE, PALMAS_USB_WAKEUP,
  37                         PALMAS_USB_WAKEUP_ID_WK_UP_COMP);
  38         else
  39                 palmas_write(palmas, PALMAS_USB_OTG_BASE, PALMAS_USB_WAKEUP, 0);
  40 }
  41
  42 static irqreturn_t palmas_vbus_irq_handler(int irq, void *_palmas_usb)
  43 {
  44         struct palmas_usb *palmas_usb = _palmas_usb;
  45         struct extcon_dev *edev = palmas_usb->edev;
  46         unsigned int vbus_line_state;
  47
  48         palmas_read(palmas_usb->palmas, PALMAS_INTERRUPT_BASE,
  49                 PALMAS_INT3_LINE_STATE, &vbus_line_state);
  50
  51         if (vbus_line_state & PALMAS_INT3_LINE_STATE_VBUS) {
  52                 if (palmas_usb->linkstat != PALMAS_USB_STATE_VBUS) {
  53                         palmas_usb->linkstat = PALMAS_USB_STATE_VBUS;
  54                         extcon_set_state_sync(edev, EXTCON_USB, true);
  55                         dev_dbg(palmas_usb->dev, "USB cable is attached\n");
  56                 } else {
  57                         dev_dbg(palmas_usb->dev,
  58                                 "Spurious connect event detected\n");
  59                 }
  60         } else if (!(vbus_line_state & PALMAS_INT3_LINE_STATE_VBUS)) {
  61                 if (palmas_usb->linkstat == PALMAS_USB_STATE_VBUS) {
  62                         palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
  63                         extcon_set_state_sync(edev, EXTCON_USB, false);
  64                         dev_dbg(palmas_usb->dev, "USB cable is detached\n");
  65                 } else {
  66                         dev_dbg(palmas_usb->dev,
  67                                 "Spurious disconnect event detected\n");
  68                 }
  69         }
  70
  71         return IRQ_HANDLED;
  72 }
  73
  74 static irqreturn_t palmas_id_irq_handler(int irq, void *_palmas_usb)
  75 {
  76         unsigned int set, id_src;
  77         struct palmas_usb *palmas_usb = _palmas_usb;
  78         struct extcon_dev *edev = palmas_usb->edev;
  79
  80         palmas_read(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
  81                 PALMAS_USB_ID_INT_LATCH_SET, &set);
  82         palmas_read(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
  83                 PALMAS_USB_ID_INT_SRC, &id_src);
  84
  85         if ((set & PALMAS_USB_ID_INT_SRC_ID_GND) &&
  86                                 (id_src & PALMAS_USB_ID_INT_SRC_ID_GND)) {
  87                 palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
  88                         PALMAS_USB_ID_INT_LATCH_CLR,
  89                         PALMAS_USB_ID_INT_EN_HI_CLR_ID_GND);
  90                 palmas_usb->linkstat = PALMAS_USB_STATE_ID;
  91                 extcon_set_state_sync(edev, EXTCON_USB_HOST, true);
  92                 dev_dbg(palmas_usb->dev, "USB-HOST cable is attached\n");
  93         } else if ((set & PALMAS_USB_ID_INT_SRC_ID_FLOAT) &&
  94                                 (id_src & PALMAS_USB_ID_INT_SRC_ID_FLOAT)) {
  95                 palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
  96                         PALMAS_USB_ID_INT_LATCH_CLR,
  97                         PALMAS_USB_ID_INT_EN_HI_CLR_ID_FLOAT);
  98                 palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
  99                 extcon_set_state_sync(edev, EXTCON_USB_HOST, false);
 100                 dev_dbg(palmas_usb->dev, "USB-HOST cable is detached\n");
 101         } else if ((palmas_usb->linkstat == PALMAS_USB_STATE_ID) &&
 102                                 (!(set & PALMAS_USB_ID_INT_SRC_ID_GND))) {
 103                 palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
 104                 extcon_set_state_sync(edev, EXTCON_USB_HOST, false);
 105                 dev_dbg(palmas_usb->dev, "USB-HOST cable is detached\n");
 106         } else if ((palmas_usb->linkstat == PALMAS_USB_STATE_DISCONNECT) &&
 107                                 (id_src & PALMAS_USB_ID_INT_SRC_ID_GND)) {
 108                 palmas_usb->linkstat = PALMAS_USB_STATE_ID;
 109                 extcon_set_state_sync(edev, EXTCON_USB_HOST, true);
 110                 dev_dbg(palmas_usb->dev, " USB-HOST cable is attached\n");
 111         }
 112
 113         return IRQ_HANDLED;
 114 }
 115
 116 static void palmas_gpio_id_detect(struct work_struct *work)
 117 {
 118         int id;
 119         struct palmas_usb *palmas_usb = container_of(to_delayed_work(work),
 120                                                      struct palmas_usb,
 121                                                      wq_detectid);
 122         struct extcon_dev *edev = palmas_usb->edev;
 123
 124         if (!palmas_usb->id_gpiod)
 125                 return;
 126
 127         id = gpiod_get_value_cansleep(palmas_usb->id_gpiod);
 128
 129         if (id) {
 130                 extcon_set_state_sync(edev, EXTCON_USB_HOST, false);
 131                 dev_dbg(palmas_usb->dev, "USB-HOST cable is detached\n");
 132         } else {
 133                 extcon_set_state_sync(edev, EXTCON_USB_HOST, true);
 134                 dev_dbg(palmas_usb->dev, "USB-HOST cable is attached\n");
 135         }
 136 }
 137
 138 static irqreturn_t palmas_gpio_id_irq_handler(int irq, void *_palmas_usb)
 139 {
 140         struct palmas_usb *palmas_usb = _palmas_usb;
 141
 142         queue_delayed_work(system_power_efficient_wq, &palmas_usb->wq_detectid,
 143                            palmas_usb->sw_debounce_jiffies);
 144
 145         return IRQ_HANDLED;
 146 }
 147
 148 static void palmas_enable_irq(struct palmas_usb *palmas_usb)
 149 {
 150         palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
 151                 PALMAS_USB_VBUS_CTRL_SET,
 152                 PALMAS_USB_VBUS_CTRL_SET_VBUS_ACT_COMP);
 153
 154         if (palmas_usb->enable_id_detection) {
 155                 palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
 156                              PALMAS_USB_ID_CTRL_SET,
 157                              PALMAS_USB_ID_CTRL_SET_ID_ACT_COMP);
 158
 159                 palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
 160                              PALMAS_USB_ID_INT_EN_HI_SET,
 161                              PALMAS_USB_ID_INT_EN_HI_SET_ID_GND |
 162                              PALMAS_USB_ID_INT_EN_HI_SET_ID_FLOAT);
 163         }
 164
 165         if (palmas_usb->enable_vbus_detection)
 166                 palmas_vbus_irq_handler(palmas_usb->vbus_irq, palmas_usb);
 167
 168         /* cold plug for host mode needs this delay */
 169         if (palmas_usb->enable_id_detection) {
 170                 msleep(30);
 171                 palmas_id_irq_handler(palmas_usb->id_irq, palmas_usb);
 172         }
 173 }
 174
 175 static int palmas_usb_probe(struct platform_device *pdev)
 176 {
 177         struct palmas *palmas = dev_get_drvdata(pdev->dev.parent);
 178         struct palmas_usb_platform_data *pdata = dev_get_platdata(&pdev->dev);
 179         struct device_node *node = pdev->dev.of_node;
 180         struct palmas_usb *palmas_usb;
 181         int status;
 182
 183         if (!palmas) {
 184                 dev_err(&pdev->dev, "failed to get valid parent\n");
 185                 return -EINVAL;
 186         }
 187
 188         palmas_usb = devm_kzalloc(&pdev->dev, sizeof(*palmas_usb), GFP_KERNEL);
 189         if (!palmas_usb)
 190                 return -ENOMEM;
 191
 192         if (node && !pdata) {
 193                 palmas_usb->wakeup = of_property_read_bool(node, "ti,wakeup");
 194                 palmas_usb->enable_id_detection = of_property_read_bool(node,
 195                                                 "ti,enable-id-detection");
 196                 palmas_usb->enable_vbus_detection = of_property_read_bool(node,
 197                                                 "ti,enable-vbus-detection");
 198         } else {
 199                 palmas_usb->wakeup = true;
 200                 palmas_usb->enable_id_detection = true;
 201                 palmas_usb->enable_vbus_detection = true;
 202
 203                 if (pdata)
 204                         palmas_usb->wakeup = pdata->wakeup;
 205         }
 206
 207         palmas_usb->id_gpiod = devm_gpiod_get_optional(&pdev->dev, "id",
 208                                                         GPIOD_IN);
 209         if (IS_ERR(palmas_usb->id_gpiod))
 210                 return dev_err_probe(&pdev->dev, PTR_ERR(palmas_usb->id_gpiod),
 211                                      "failed to get id gpio\n");
 212
 213         palmas_usb->vbus_gpiod = devm_gpiod_get_optional(&pdev->dev, "vbus",
 214                                                         GPIOD_IN);
 215         if (IS_ERR(palmas_usb->vbus_gpiod))
 216                 return dev_err_probe(&pdev->dev, PTR_ERR(palmas_usb->vbus_gpiod),
 217                                      "failed to get id gpio\n");
 218
 219         if (palmas_usb->enable_id_detection && palmas_usb->id_gpiod) {
 220                 palmas_usb->enable_id_detection = false;
 221                 palmas_usb->enable_gpio_id_detection = true;
 222         }
 223
 224         if (palmas_usb->enable_vbus_detection && palmas_usb->vbus_gpiod) {
 225                 palmas_usb->enable_vbus_detection = false;
 226                 palmas_usb->enable_gpio_vbus_detection = true;
 227         }
 228
 229         if (palmas_usb->enable_gpio_id_detection) {
 230                 u32 debounce;
 231
 232                 if (of_property_read_u32(node, "debounce-delay-ms", &debounce))
 233                         debounce = USB_GPIO_DEBOUNCE_MS;
 234
 235                 status = gpiod_set_debounce(palmas_usb->id_gpiod,
 236                                             debounce * 1000);
 237                 if (status < 0)
 238                         palmas_usb->sw_debounce_jiffies = msecs_to_jiffies(debounce);
 239         }
 240
 241         status = devm_delayed_work_autocancel(&pdev->dev,
 242                                               &palmas_usb->wq_detectid,
 243                                               palmas_gpio_id_detect);
 244         if (status)
 245                 return status;
 246
 247         palmas->usb = palmas_usb;
 248         palmas_usb->palmas = palmas;
 249
 250         palmas_usb->dev  = &pdev->dev;
 251
 252         palmas_usb_wakeup(palmas, palmas_usb->wakeup);
 253
 254         platform_set_drvdata(pdev, palmas_usb);
 255
 256         palmas_usb->edev = devm_extcon_dev_allocate(&pdev->dev,
 257                                                     palmas_extcon_cable);
 258         if (IS_ERR(palmas_usb->edev)) {
 259                 dev_err(&pdev->dev, "failed to allocate extcon device\n");
 260                 return -ENOMEM;
 261         }
 262
 263         status = devm_extcon_dev_register(&pdev->dev, palmas_usb->edev);
 264         if (status) {
 265                 dev_err(&pdev->dev, "failed to register extcon device\n");
 266                 return status;
 267         }
 268
 269         if (palmas_usb->enable_id_detection) {
 270                 palmas_usb->id_otg_irq = regmap_irq_get_virq(palmas->irq_data,
 271                                                              PALMAS_ID_OTG_IRQ);
 272                 palmas_usb->id_irq = regmap_irq_get_virq(palmas->irq_data,
 273                                                          PALMAS_ID_IRQ);
 274                 status = devm_request_threaded_irq(palmas_usb->dev,
 275                                 palmas_usb->id_irq,
 276                                 NULL, palmas_id_irq_handler,
 277                                 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING |
 278                                 IRQF_ONESHOT,
 279                                 "palmas_usb_id", palmas_usb);
 280                 if (status < 0) {
 281                         dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
 282                                         palmas_usb->id_irq, status);
 283                         return status;
 284                 }
 285         } else if (palmas_usb->enable_gpio_id_detection) {
 286                 palmas_usb->gpio_id_irq = gpiod_to_irq(palmas_usb->id_gpiod);
 287                 if (palmas_usb->gpio_id_irq < 0) {
 288                         dev_err(&pdev->dev, "failed to get id irq\n");
 289                         return palmas_usb->gpio_id_irq;
 290                 }
 291                 status = devm_request_threaded_irq(&pdev->dev,
 292                                                    palmas_usb->gpio_id_irq,
 293                                                    NULL,
 294                                                    palmas_gpio_id_irq_handler,
 295                                                    IRQF_TRIGGER_RISING |
 296                                                    IRQF_TRIGGER_FALLING |
 297                                                    IRQF_ONESHOT,
 298                                                    "palmas_usb_id",
 299                                                    palmas_usb);
 300                 if (status < 0) {
 301                         dev_err(&pdev->dev,
 302                                 "failed to request handler for id irq\n");
 303                         return status;
 304                 }
 305         }
 306
 307         if (palmas_usb->enable_vbus_detection) {
 308                 palmas_usb->vbus_otg_irq = regmap_irq_get_virq(palmas->irq_data,
 309                                                        PALMAS_VBUS_OTG_IRQ);
 310                 palmas_usb->vbus_irq = regmap_irq_get_virq(palmas->irq_data,
 311                                                            PALMAS_VBUS_IRQ);
 312                 status = devm_request_threaded_irq(palmas_usb->dev,
 313                                 palmas_usb->vbus_irq, NULL,
 314                                 palmas_vbus_irq_handler,
 315                                 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING |
 316                                 IRQF_ONESHOT,
 317                                 "palmas_usb_vbus", palmas_usb);
 318                 if (status < 0) {
 319                         dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
 320                                         palmas_usb->vbus_irq, status);
 321                         return status;
 322                 }
 323         } else if (palmas_usb->enable_gpio_vbus_detection) {
 324                 /* remux GPIO_1 as VBUSDET */
 325                 status = palmas_update_bits(palmas,
 326                         PALMAS_PU_PD_OD_BASE,
 327                         PALMAS_PRIMARY_SECONDARY_PAD1,
 328                         PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_1_MASK,
 329                         (1 << PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_1_SHIFT));
 330                 if (status < 0) {
 331                         dev_err(&pdev->dev, "can't remux GPIO1\n");
 332                         return status;
 333                 }
 334
 335                 palmas_usb->vbus_otg_irq = regmap_irq_get_virq(palmas->irq_data,
 336                                                        PALMAS_VBUS_OTG_IRQ);
 337                 palmas_usb->gpio_vbus_irq = gpiod_to_irq(palmas_usb->vbus_gpiod);
 338                 if (palmas_usb->gpio_vbus_irq < 0) {
 339                         dev_err(&pdev->dev, "failed to get vbus irq\n");
 340                         return palmas_usb->gpio_vbus_irq;
 341                 }
 342                 status = devm_request_threaded_irq(&pdev->dev,
 343                                                 palmas_usb->gpio_vbus_irq,
 344                                                 NULL,
 345                                                 palmas_vbus_irq_handler,
 346                                                 IRQF_TRIGGER_FALLING |
 347                                                 IRQF_TRIGGER_RISING |
 348                                                 IRQF_ONESHOT,
 349                                                 "palmas_usb_vbus",
 350                                                 palmas_usb);
 351                 if (status < 0) {
 352                         dev_err(&pdev->dev,
 353                                 "failed to request handler for vbus irq\n");
 354                         return status;
 355                 }
 356         }
 357
 358         palmas_enable_irq(palmas_usb);
 359         /* perform initial detection */
 360         if (palmas_usb->enable_gpio_vbus_detection)
 361                 palmas_vbus_irq_handler(palmas_usb->gpio_vbus_irq, palmas_usb);
 362         palmas_gpio_id_detect(&palmas_usb->wq_detectid.work);
 363         device_set_wakeup_capable(&pdev->dev, true);
 364         return 0;
 365 }
 366
 367 #ifdef CONFIG_PM_SLEEP
 368 static int palmas_usb_suspend(struct device *dev)
 369 {
 370         struct palmas_usb *palmas_usb = dev_get_drvdata(dev);
 371
 372         if (device_may_wakeup(dev)) {
 373                 if (palmas_usb->enable_vbus_detection)
 374                         enable_irq_wake(palmas_usb->vbus_irq);
 375                 if (palmas_usb->enable_gpio_vbus_detection)
 376                         enable_irq_wake(palmas_usb->gpio_vbus_irq);
 377                 if (palmas_usb->enable_id_detection)
 378                         enable_irq_wake(palmas_usb->id_irq);
 379                 if (palmas_usb->enable_gpio_id_detection)
 380                         enable_irq_wake(palmas_usb->gpio_id_irq);
 381         }
 382         return 0;
 383 }
 384
 385 static int palmas_usb_resume(struct device *dev)
 386 {
 387         struct palmas_usb *palmas_usb = dev_get_drvdata(dev);
 388
 389         if (device_may_wakeup(dev)) {
 390                 if (palmas_usb->enable_vbus_detection)
 391                         disable_irq_wake(palmas_usb->vbus_irq);
 392                 if (palmas_usb->enable_gpio_vbus_detection)
 393                         disable_irq_wake(palmas_usb->gpio_vbus_irq);
 394                 if (palmas_usb->enable_id_detection)
 395                         disable_irq_wake(palmas_usb->id_irq);
 396                 if (palmas_usb->enable_gpio_id_detection)
 397                         disable_irq_wake(palmas_usb->gpio_id_irq);
 398         }
 399
 400         /* check if GPIO states changed while suspend/resume */
 401         if (palmas_usb->enable_gpio_vbus_detection)
 402                 palmas_vbus_irq_handler(palmas_usb->gpio_vbus_irq, palmas_usb);
 403         palmas_gpio_id_detect(&palmas_usb->wq_detectid.work);
 404
 405         return 0;
 406 };
 407 #endif
 408
 409 static SIMPLE_DEV_PM_OPS(palmas_pm_ops, palmas_usb_suspend, palmas_usb_resume);
 410
 411 static const struct of_device_id of_palmas_match_tbl[] = {
 412         { .compatible = "ti,palmas-usb", },
 413         { .compatible = "ti,palmas-usb-vid", },
 414         { .compatible = "ti,twl6035-usb", },
 415         { .compatible = "ti,twl6035-usb-vid", },
 416         { /* end */ }
 417 };
 418
 419 static struct platform_driver palmas_usb_driver = {
 420         .probe = palmas_usb_probe,
 421         .driver = {
 422                 .name = "palmas-usb",
 423                 .of_match_table = of_palmas_match_tbl,
 424                 .pm = &palmas_pm_ops,
 425         },
 426 };
 427
 428 module_platform_driver(palmas_usb_driver);
 429
 430 MODULE_ALIAS("platform:palmas-usb");
 431 MODULE_AUTHOR("Graeme Gregory <gg@slimlogic.co.uk>");
 432 MODULE_DESCRIPTION("Palmas USB transceiver driver");
 433 MODULE_LICENSE("GPL");
 434 MODULE_DEVICE_TABLE(of, of_palmas_match_tbl);