drivers/extcon/extcon-palmas.c

   1 /*
   2  * Palmas USB transceiver driver
   3  *
   4  * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * Author: Graeme Gregory <gg@slimlogic.co.uk>
  11  * Author: Kishon Vijay Abraham I <kishon@ti.com>
  12  *
  13  * Based on twl6030_usb.c
  14  *
  15  * Author: Hema HK <hemahk@ti.com>
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  */
  22
  23 #include <linux/module.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/platform_device.h>
  26 #include <linux/slab.h>
  27 #include <linux/err.h>
  28 #include <linux/mfd/palmas.h>
  29 #include <linux/of.h>
  30 #include <linux/of_platform.h>
  31 #include <linux/of_gpio.h>
  32 #include <linux/gpio/consumer.h>
  33 #include <linux/workqueue.h>
  34
  35 #define USB_GPIO_DEBOUNCE_MS    20      /* ms */
  36
  37 static const unsigned int palmas_extcon_cable[] = {
  38         EXTCON_USB,
  39         EXTCON_USB_HOST,
  40         EXTCON_NONE,
  41 };
  42
  43 static void palmas_usb_wakeup(struct palmas *palmas, int enable)
  44 {
  45         if (enable)
  46                 palmas_write(palmas, PALMAS_USB_OTG_BASE, PALMAS_USB_WAKEUP,
  47                         PALMAS_USB_WAKEUP_ID_WK_UP_COMP);
  48         else
  49                 palmas_write(palmas, PALMAS_USB_OTG_BASE, PALMAS_USB_WAKEUP, 0);
  50 }
  51
  52 static irqreturn_t palmas_vbus_irq_handler(int irq, void *_palmas_usb)
  53 {
  54         struct palmas_usb *palmas_usb = _palmas_usb;
  55         struct extcon_dev *edev = palmas_usb->edev;
  56         unsigned int vbus_line_state;
  57
  58         palmas_read(palmas_usb->palmas, PALMAS_INTERRUPT_BASE,
  59                 PALMAS_INT3_LINE_STATE, &vbus_line_state);
  60
  61         if (vbus_line_state & PALMAS_INT3_LINE_STATE_VBUS) {
  62                 if (palmas_usb->linkstat != PALMAS_USB_STATE_VBUS) {
  63                         palmas_usb->linkstat = PALMAS_USB_STATE_VBUS;
  64                         extcon_set_state_sync(edev, EXTCON_USB, true);
  65                         dev_dbg(palmas_usb->dev, "USB cable is attached\n");
  66                 } else {
  67                         dev_dbg(palmas_usb->dev,
  68                                 "Spurious connect event detected\n");
  69                 }
  70         } else if (!(vbus_line_state & PALMAS_INT3_LINE_STATE_VBUS)) {
  71                 if (palmas_usb->linkstat == PALMAS_USB_STATE_VBUS) {
  72                         palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
  73                         extcon_set_state_sync(edev, EXTCON_USB, false);
  74                         dev_dbg(palmas_usb->dev, "USB cable is detached\n");
  75                 } else {
  76                         dev_dbg(palmas_usb->dev,
  77                                 "Spurious disconnect event detected\n");
  78                 }
  79         }
  80
  81         return IRQ_HANDLED;
  82 }
  83
  84 static irqreturn_t palmas_id_irq_handler(int irq, void *_palmas_usb)
  85 {
  86         unsigned int set, id_src;
  87         struct palmas_usb *palmas_usb = _palmas_usb;
  88         struct extcon_dev *edev = palmas_usb->edev;
  89
  90         palmas_read(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
  91                 PALMAS_USB_ID_INT_LATCH_SET, &set);
  92         palmas_read(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
  93                 PALMAS_USB_ID_INT_SRC, &id_src);
  94
  95         if ((set & PALMAS_USB_ID_INT_SRC_ID_GND) &&
  96                                 (id_src & PALMAS_USB_ID_INT_SRC_ID_GND)) {
  97                 palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
  98                         PALMAS_USB_ID_INT_LATCH_CLR,
  99                         PALMAS_USB_ID_INT_EN_HI_CLR_ID_GND);
 100                 palmas_usb->linkstat = PALMAS_USB_STATE_ID;
 101                 extcon_set_state_sync(edev, EXTCON_USB_HOST, true);
 102                 dev_dbg(palmas_usb->dev, "USB-HOST cable is attached\n");
 103         } else if ((set & PALMAS_USB_ID_INT_SRC_ID_FLOAT) &&
 104                                 (id_src & PALMAS_USB_ID_INT_SRC_ID_FLOAT)) {
 105                 palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
 106                         PALMAS_USB_ID_INT_LATCH_CLR,
 107                         PALMAS_USB_ID_INT_EN_HI_CLR_ID_FLOAT);
 108                 palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
 109                 extcon_set_state_sync(edev, EXTCON_USB_HOST, false);
 110                 dev_dbg(palmas_usb->dev, "USB-HOST cable is detached\n");
 111         } else if ((palmas_usb->linkstat == PALMAS_USB_STATE_ID) &&
 112                                 (!(set & PALMAS_USB_ID_INT_SRC_ID_GND))) {
 113                 palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
 114                 extcon_set_state_sync(edev, EXTCON_USB_HOST, false);
 115                 dev_dbg(palmas_usb->dev, "USB-HOST cable is detached\n");
 116         } else if ((palmas_usb->linkstat == PALMAS_USB_STATE_DISCONNECT) &&
 117                                 (id_src & PALMAS_USB_ID_INT_SRC_ID_GND)) {
 118                 palmas_usb->linkstat = PALMAS_USB_STATE_ID;
 119                 extcon_set_state_sync(edev, EXTCON_USB_HOST, true);
 120                 dev_dbg(palmas_usb->dev, " USB-HOST cable is attached\n");
 121         }
 122
 123         return IRQ_HANDLED;
 124 }
 125
 126 static void palmas_gpio_id_detect(struct work_struct *work)
 127 {
 128         int id;
 129         struct palmas_usb *palmas_usb = container_of(to_delayed_work(work),
 130                                                      struct palmas_usb,
 131                                                      wq_detectid);
 132         struct extcon_dev *edev = palmas_usb->edev;
 133
 134         if (!palmas_usb->id_gpiod)
 135                 return;
 136
 137         id = gpiod_get_value_cansleep(palmas_usb->id_gpiod);
 138
 139         if (id) {
 140                 extcon_set_state_sync(edev, EXTCON_USB_HOST, false);
 141                 dev_dbg(palmas_usb->dev, "USB-HOST cable is detached\n");
 142         } else {
 143                 extcon_set_state_sync(edev, EXTCON_USB_HOST, true);
 144                 dev_dbg(palmas_usb->dev, "USB-HOST cable is attached\n");
 145         }
 146 }
 147
 148 static irqreturn_t palmas_gpio_id_irq_handler(int irq, void *_palmas_usb)
 149 {
 150         struct palmas_usb *palmas_usb = _palmas_usb;
 151
 152         queue_delayed_work(system_power_efficient_wq, &palmas_usb->wq_detectid,
 153                            palmas_usb->sw_debounce_jiffies);
 154
 155         return IRQ_HANDLED;
 156 }
 157
 158 static void palmas_enable_irq(struct palmas_usb *palmas_usb)
 159 {
 160         palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
 161                 PALMAS_USB_VBUS_CTRL_SET,
 162                 PALMAS_USB_VBUS_CTRL_SET_VBUS_ACT_COMP);
 163
 164         if (palmas_usb->enable_id_detection) {
 165                 palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
 166                              PALMAS_USB_ID_CTRL_SET,
 167                              PALMAS_USB_ID_CTRL_SET_ID_ACT_COMP);
 168
 169                 palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
 170                              PALMAS_USB_ID_INT_EN_HI_SET,
 171                              PALMAS_USB_ID_INT_EN_HI_SET_ID_GND |
 172                              PALMAS_USB_ID_INT_EN_HI_SET_ID_FLOAT);
 173         }
 174
 175         if (palmas_usb->enable_vbus_detection)
 176                 palmas_vbus_irq_handler(palmas_usb->vbus_irq, palmas_usb);
 177
 178         /* cold plug for host mode needs this delay */
 179         if (palmas_usb->enable_id_detection) {
 180                 msleep(30);
 181                 palmas_id_irq_handler(palmas_usb->id_irq, palmas_usb);
 182         }
 183 }
 184
 185 static int palmas_usb_probe(struct platform_device *pdev)
 186 {
 187         struct palmas *palmas = dev_get_drvdata(pdev->dev.parent);
 188         struct palmas_usb_platform_data *pdata = dev_get_platdata(&pdev->dev);
 189         struct device_node *node = pdev->dev.of_node;
 190         struct palmas_usb *palmas_usb;
 191         int status;
 192
 193         if (!palmas) {
 194                 dev_err(&pdev->dev, "failed to get valid parent\n");
 195                 return -EINVAL;
 196         }
 197
 198         palmas_usb = devm_kzalloc(&pdev->dev, sizeof(*palmas_usb), GFP_KERNEL);
 199         if (!palmas_usb)
 200                 return -ENOMEM;
 201
 202         if (node && !pdata) {
 203                 palmas_usb->wakeup = of_property_read_bool(node, "ti,wakeup");
 204                 palmas_usb->enable_id_detection = of_property_read_bool(node,
 205                                                 "ti,enable-id-detection");
 206                 palmas_usb->enable_vbus_detection = of_property_read_bool(node,
 207                                                 "ti,enable-vbus-detection");
 208         } else {
 209                 palmas_usb->wakeup = true;
 210                 palmas_usb->enable_id_detection = true;
 211                 palmas_usb->enable_vbus_detection = true;
 212
 213                 if (pdata)
 214                         palmas_usb->wakeup = pdata->wakeup;
 215         }
 216
 217         palmas_usb->id_gpiod = devm_gpiod_get_optional(&pdev->dev, "id",
 218                                                         GPIOD_IN);
 219         if (IS_ERR(palmas_usb->id_gpiod)) {
 220                 dev_err(&pdev->dev, "failed to get id gpio\n");
 221                 return PTR_ERR(palmas_usb->id_gpiod);
 222         }
 223
 224         palmas_usb->vbus_gpiod = devm_gpiod_get_optional(&pdev->dev, "vbus",
 225                                                         GPIOD_IN);
 226         if (IS_ERR(palmas_usb->vbus_gpiod)) {
 227                 dev_err(&pdev->dev, "failed to get vbus gpio\n");
 228                 return PTR_ERR(palmas_usb->vbus_gpiod);
 229         }
 230
 231         if (palmas_usb->enable_id_detection && palmas_usb->id_gpiod) {
 232                 palmas_usb->enable_id_detection = false;
 233                 palmas_usb->enable_gpio_id_detection = true;
 234         }
 235
 236         if (palmas_usb->enable_vbus_detection && palmas_usb->vbus_gpiod) {
 237                 palmas_usb->enable_vbus_detection = false;
 238                 palmas_usb->enable_gpio_vbus_detection = true;
 239         }
 240
 241         if (palmas_usb->enable_gpio_id_detection) {
 242                 u32 debounce;
 243
 244                 if (of_property_read_u32(node, "debounce-delay-ms", &debounce))
 245                         debounce = USB_GPIO_DEBOUNCE_MS;
 246
 247                 status = gpiod_set_debounce(palmas_usb->id_gpiod,
 248                                             debounce * 1000);
 249                 if (status < 0)
 250                         palmas_usb->sw_debounce_jiffies = msecs_to_jiffies(debounce);
 251         }
 252
 253         INIT_DELAYED_WORK(&palmas_usb->wq_detectid, palmas_gpio_id_detect);
 254
 255         palmas->usb = palmas_usb;
 256         palmas_usb->palmas = palmas;
 257
 258         palmas_usb->dev  = &pdev->dev;
 259
 260         palmas_usb_wakeup(palmas, palmas_usb->wakeup);
 261
 262         platform_set_drvdata(pdev, palmas_usb);
 263
 264         palmas_usb->edev = devm_extcon_dev_allocate(&pdev->dev,
 265                                                     palmas_extcon_cable);
 266         if (IS_ERR(palmas_usb->edev)) {
 267                 dev_err(&pdev->dev, "failed to allocate extcon device\n");
 268                 return -ENOMEM;
 269         }
 270
 271         status = devm_extcon_dev_register(&pdev->dev, palmas_usb->edev);
 272         if (status) {
 273                 dev_err(&pdev->dev, "failed to register extcon device\n");
 274                 return status;
 275         }
 276
 277         if (palmas_usb->enable_id_detection) {
 278                 palmas_usb->id_otg_irq = regmap_irq_get_virq(palmas->irq_data,
 279                                                              PALMAS_ID_OTG_IRQ);
 280                 palmas_usb->id_irq = regmap_irq_get_virq(palmas->irq_data,
 281                                                          PALMAS_ID_IRQ);
 282                 status = devm_request_threaded_irq(palmas_usb->dev,
 283                                 palmas_usb->id_irq,
 284                                 NULL, palmas_id_irq_handler,
 285                                 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING |
 286                                 IRQF_ONESHOT,
 287                                 "palmas_usb_id", palmas_usb);
 288                 if (status < 0) {
 289                         dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
 290                                         palmas_usb->id_irq, status);
 291                         return status;
 292                 }
 293         } else if (palmas_usb->enable_gpio_id_detection) {
 294                 palmas_usb->gpio_id_irq = gpiod_to_irq(palmas_usb->id_gpiod);
 295                 if (palmas_usb->gpio_id_irq < 0) {
 296                         dev_err(&pdev->dev, "failed to get id irq\n");
 297                         return palmas_usb->gpio_id_irq;
 298                 }
 299                 status = devm_request_threaded_irq(&pdev->dev,
 300                                                    palmas_usb->gpio_id_irq,
 301                                                    NULL,
 302                                                    palmas_gpio_id_irq_handler,
 303                                                    IRQF_TRIGGER_RISING |
 304                                                    IRQF_TRIGGER_FALLING |
 305                                                    IRQF_ONESHOT,
 306                                                    "palmas_usb_id",
 307                                                    palmas_usb);
 308                 if (status < 0) {
 309                         dev_err(&pdev->dev,
 310                                 "failed to request handler for id irq\n");
 311                         return status;
 312                 }
 313         }
 314
 315         if (palmas_usb->enable_vbus_detection) {
 316                 palmas_usb->vbus_otg_irq = regmap_irq_get_virq(palmas->irq_data,
 317                                                        PALMAS_VBUS_OTG_IRQ);
 318                 palmas_usb->vbus_irq = regmap_irq_get_virq(palmas->irq_data,
 319                                                            PALMAS_VBUS_IRQ);
 320                 status = devm_request_threaded_irq(palmas_usb->dev,
 321                                 palmas_usb->vbus_irq, NULL,
 322                                 palmas_vbus_irq_handler,
 323                                 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING |
 324                                 IRQF_ONESHOT,
 325                                 "palmas_usb_vbus", palmas_usb);
 326                 if (status < 0) {
 327                         dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
 328                                         palmas_usb->vbus_irq, status);
 329                         return status;
 330                 }
 331         } else if (palmas_usb->enable_gpio_vbus_detection) {
 332                 /* remux GPIO_1 as VBUSDET */
 333                 status = palmas_update_bits(palmas,
 334                         PALMAS_PU_PD_OD_BASE,
 335                         PALMAS_PRIMARY_SECONDARY_PAD1,
 336                         PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_1_MASK,
 337                         (1 << PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_1_SHIFT));
 338                 if (status < 0) {
 339                         dev_err(&pdev->dev, "can't remux GPIO1\n");
 340                         return status;
 341                 }
 342
 343                 palmas_usb->vbus_otg_irq = regmap_irq_get_virq(palmas->irq_data,
 344                                                        PALMAS_VBUS_OTG_IRQ);
 345                 palmas_usb->gpio_vbus_irq = gpiod_to_irq(palmas_usb->vbus_gpiod);
 346                 if (palmas_usb->gpio_vbus_irq < 0) {
 347                         dev_err(&pdev->dev, "failed to get vbus irq\n");
 348                         return palmas_usb->gpio_vbus_irq;
 349                 }
 350                 status = devm_request_threaded_irq(&pdev->dev,
 351                                                 palmas_usb->gpio_vbus_irq,
 352                                                 NULL,
 353                                                 palmas_vbus_irq_handler,
 354                                                 IRQF_TRIGGER_FALLING |
 355                                                 IRQF_TRIGGER_RISING |
 356                                                 IRQF_ONESHOT,
 357                                                 "palmas_usb_vbus",
 358                                                 palmas_usb);
 359                 if (status < 0) {
 360                         dev_err(&pdev->dev,
 361                                 "failed to request handler for vbus irq\n");
 362                         return status;
 363                 }
 364         }
 365
 366         palmas_enable_irq(palmas_usb);
 367         /* perform initial detection */
 368         if (palmas_usb->enable_gpio_vbus_detection)
 369                 palmas_vbus_irq_handler(palmas_usb->gpio_vbus_irq, palmas_usb);
 370         palmas_gpio_id_detect(&palmas_usb->wq_detectid.work);
 371         device_set_wakeup_capable(&pdev->dev, true);
 372         return 0;
 373 }
 374
 375 static int palmas_usb_remove(struct platform_device *pdev)
 376 {
 377         struct palmas_usb *palmas_usb = platform_get_drvdata(pdev);
 378
 379         cancel_delayed_work_sync(&palmas_usb->wq_detectid);
 380
 381         return 0;
 382 }
 383
 384 #ifdef CONFIG_PM_SLEEP
 385 static int palmas_usb_suspend(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                         enable_irq_wake(palmas_usb->vbus_irq);
 392                 if (palmas_usb->enable_gpio_vbus_detection)
 393                         enable_irq_wake(palmas_usb->gpio_vbus_irq);
 394                 if (palmas_usb->enable_id_detection)
 395                         enable_irq_wake(palmas_usb->id_irq);
 396                 if (palmas_usb->enable_gpio_id_detection)
 397                         enable_irq_wake(palmas_usb->gpio_id_irq);
 398         }
 399         return 0;
 400 }
 401
 402 static int palmas_usb_resume(struct device *dev)
 403 {
 404         struct palmas_usb *palmas_usb = dev_get_drvdata(dev);
 405
 406         if (device_may_wakeup(dev)) {
 407                 if (palmas_usb->enable_vbus_detection)
 408                         disable_irq_wake(palmas_usb->vbus_irq);
 409                 if (palmas_usb->enable_gpio_vbus_detection)
 410                         disable_irq_wake(palmas_usb->gpio_vbus_irq);
 411                 if (palmas_usb->enable_id_detection)
 412                         disable_irq_wake(palmas_usb->id_irq);
 413                 if (palmas_usb->enable_gpio_id_detection)
 414                         disable_irq_wake(palmas_usb->gpio_id_irq);
 415         }
 416
 417         /* check if GPIO states changed while suspend/resume */
 418         if (palmas_usb->enable_gpio_vbus_detection)
 419                 palmas_vbus_irq_handler(palmas_usb->gpio_vbus_irq, palmas_usb);
 420         palmas_gpio_id_detect(&palmas_usb->wq_detectid.work);
 421
 422         return 0;
 423 };
 424 #endif
 425
 426 static SIMPLE_DEV_PM_OPS(palmas_pm_ops, palmas_usb_suspend, palmas_usb_resume);
 427
 428 static const struct of_device_id of_palmas_match_tbl[] = {
 429         { .compatible = "ti,palmas-usb", },
 430         { .compatible = "ti,palmas-usb-vid", },
 431         { .compatible = "ti,twl6035-usb", },
 432         { .compatible = "ti,twl6035-usb-vid", },
 433         { /* end */ }
 434 };
 435
 436 static struct platform_driver palmas_usb_driver = {
 437         .probe = palmas_usb_probe,
 438         .remove = palmas_usb_remove,
 439         .driver = {
 440                 .name = "palmas-usb",
 441                 .of_match_table = of_palmas_match_tbl,
 442                 .pm = &palmas_pm_ops,
 443         },
 444 };
 445
 446 module_platform_driver(palmas_usb_driver);
 447
 448 MODULE_ALIAS("platform:palmas-usb");
 449 MODULE_AUTHOR("Graeme Gregory <gg@slimlogic.co.uk>");
 450 MODULE_DESCRIPTION("Palmas USB transceiver driver");
 451 MODULE_LICENSE("GPL");
 452 MODULE_DEVICE_TABLE(of, of_palmas_match_tbl);