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_cable_state_(edev, EXTCON_USB, true);
  65                         dev_info(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_cable_state_(edev, EXTCON_USB, false);
  74                         dev_info(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_cable_state_(edev, EXTCON_USB_HOST, true);
 102                 dev_info(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_cable_state_(edev, EXTCON_USB_HOST, false);
 110                 dev_info(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_cable_state_(edev, EXTCON_USB_HOST, false);
 115                 dev_info(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_cable_state_(edev, EXTCON_USB_HOST, true);
 120                 dev_info(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_cable_state_(edev, EXTCON_USB_HOST, false);
 141                 dev_info(palmas_usb->dev, "USB-HOST cable is detached\n");
 142         } else {
 143                 extcon_set_cable_state_(edev, EXTCON_USB_HOST, true);
 144                 dev_info(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         palmas_usb = devm_kzalloc(&pdev->dev, sizeof(*palmas_usb), GFP_KERNEL);
 194         if (!palmas_usb)
 195                 return -ENOMEM;
 196
 197         if (node && !pdata) {
 198                 palmas_usb->wakeup = of_property_read_bool(node, "ti,wakeup");
 199                 palmas_usb->enable_id_detection = of_property_read_bool(node,
 200                                                 "ti,enable-id-detection");
 201                 palmas_usb->enable_vbus_detection = of_property_read_bool(node,
 202                                                 "ti,enable-vbus-detection");
 203         } else {
 204                 palmas_usb->wakeup = true;
 205                 palmas_usb->enable_id_detection = true;
 206                 palmas_usb->enable_vbus_detection = true;
 207
 208                 if (pdata)
 209                         palmas_usb->wakeup = pdata->wakeup;
 210         }
 211
 212         palmas_usb->id_gpiod = devm_gpiod_get_optional(&pdev->dev, "id",
 213                                                         GPIOD_IN);
 214         if (IS_ERR(palmas_usb->id_gpiod)) {
 215                 dev_err(&pdev->dev, "failed to get id gpio\n");
 216                 return PTR_ERR(palmas_usb->id_gpiod);
 217         }
 218
 219         palmas_usb->vbus_gpiod = devm_gpiod_get_optional(&pdev->dev, "vbus",
 220                                                         GPIOD_IN);
 221         if (IS_ERR(palmas_usb->vbus_gpiod)) {
 222                 dev_err(&pdev->dev, "failed to get vbus gpio\n");
 223                 return PTR_ERR(palmas_usb->vbus_gpiod);
 224         }
 225
 226         if (palmas_usb->enable_id_detection && palmas_usb->id_gpiod) {
 227                 palmas_usb->enable_id_detection = false;
 228                 palmas_usb->enable_gpio_id_detection = true;
 229         }
 230
 231         if (palmas_usb->enable_vbus_detection && palmas_usb->vbus_gpiod) {
 232                 palmas_usb->enable_vbus_detection = false;
 233                 palmas_usb->enable_gpio_vbus_detection = true;
 234         }
 235
 236         if (palmas_usb->enable_gpio_id_detection) {
 237                 u32 debounce;
 238
 239                 if (of_property_read_u32(node, "debounce-delay-ms", &debounce))
 240                         debounce = USB_GPIO_DEBOUNCE_MS;
 241
 242                 status = gpiod_set_debounce(palmas_usb->id_gpiod,
 243                                             debounce * 1000);
 244                 if (status < 0)
 245                         palmas_usb->sw_debounce_jiffies = msecs_to_jiffies(debounce);
 246         }
 247
 248         INIT_DELAYED_WORK(&palmas_usb->wq_detectid, palmas_gpio_id_detect);
 249
 250         palmas->usb = palmas_usb;
 251         palmas_usb->palmas = palmas;
 252
 253         palmas_usb->dev  = &pdev->dev;
 254
 255         palmas_usb_wakeup(palmas, palmas_usb->wakeup);
 256
 257         platform_set_drvdata(pdev, palmas_usb);
 258
 259         palmas_usb->edev = devm_extcon_dev_allocate(&pdev->dev,
 260                                                     palmas_extcon_cable);
 261         if (IS_ERR(palmas_usb->edev)) {
 262                 dev_err(&pdev->dev, "failed to allocate extcon device\n");
 263                 return -ENOMEM;
 264         }
 265
 266         status = devm_extcon_dev_register(&pdev->dev, palmas_usb->edev);
 267         if (status) {
 268                 dev_err(&pdev->dev, "failed to register extcon device\n");
 269                 return status;
 270         }
 271
 272         if (palmas_usb->enable_id_detection) {
 273                 palmas_usb->id_otg_irq = regmap_irq_get_virq(palmas->irq_data,
 274                                                              PALMAS_ID_OTG_IRQ);
 275                 palmas_usb->id_irq = regmap_irq_get_virq(palmas->irq_data,
 276                                                          PALMAS_ID_IRQ);
 277                 status = devm_request_threaded_irq(palmas_usb->dev,
 278                                 palmas_usb->id_irq,
 279                                 NULL, palmas_id_irq_handler,
 280                                 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING |
 281                                 IRQF_ONESHOT,
 282                                 "palmas_usb_id", palmas_usb);
 283                 if (status < 0) {
 284                         dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
 285                                         palmas_usb->id_irq, status);
 286                         return status;
 287                 }
 288         } else if (palmas_usb->enable_gpio_id_detection) {
 289                 palmas_usb->gpio_id_irq = gpiod_to_irq(palmas_usb->id_gpiod);
 290                 if (palmas_usb->gpio_id_irq < 0) {
 291                         dev_err(&pdev->dev, "failed to get id irq\n");
 292                         return palmas_usb->gpio_id_irq;
 293                 }
 294                 status = devm_request_threaded_irq(&pdev->dev,
 295                                                    palmas_usb->gpio_id_irq,
 296                                                    NULL,
 297                                                    palmas_gpio_id_irq_handler,
 298                                                    IRQF_TRIGGER_RISING |
 299                                                    IRQF_TRIGGER_FALLING |
 300                                                    IRQF_ONESHOT,
 301                                                    "palmas_usb_id",
 302                                                    palmas_usb);
 303                 if (status < 0) {
 304                         dev_err(&pdev->dev,
 305                                 "failed to request handler for id irq\n");
 306                         return status;
 307                 }
 308         }
 309
 310         if (palmas_usb->enable_vbus_detection) {
 311                 palmas_usb->vbus_otg_irq = regmap_irq_get_virq(palmas->irq_data,
 312                                                        PALMAS_VBUS_OTG_IRQ);
 313                 palmas_usb->vbus_irq = regmap_irq_get_virq(palmas->irq_data,
 314                                                            PALMAS_VBUS_IRQ);
 315                 status = devm_request_threaded_irq(palmas_usb->dev,
 316                                 palmas_usb->vbus_irq, NULL,
 317                                 palmas_vbus_irq_handler,
 318                                 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING |
 319                                 IRQF_ONESHOT,
 320                                 "palmas_usb_vbus", palmas_usb);
 321                 if (status < 0) {
 322                         dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
 323                                         palmas_usb->vbus_irq, status);
 324                         return status;
 325                 }
 326         } else if (palmas_usb->enable_gpio_vbus_detection) {
 327                 /* remux GPIO_1 as VBUSDET */
 328                 status = palmas_update_bits(palmas,
 329                         PALMAS_PU_PD_OD_BASE,
 330                         PALMAS_PRIMARY_SECONDARY_PAD1,
 331                         PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_1_MASK,
 332                         (1 << PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_1_SHIFT));
 333                 if (status < 0) {
 334                         dev_err(&pdev->dev, "can't remux GPIO1\n");
 335                         return status;
 336                 }
 337
 338                 palmas_usb->vbus_otg_irq = regmap_irq_get_virq(palmas->irq_data,
 339                                                        PALMAS_VBUS_OTG_IRQ);
 340                 palmas_usb->gpio_vbus_irq = gpiod_to_irq(palmas_usb->vbus_gpiod);
 341                 if (palmas_usb->gpio_vbus_irq < 0) {
 342                         dev_err(&pdev->dev, "failed to get vbus irq\n");
 343                         return palmas_usb->gpio_vbus_irq;
 344                 }
 345                 status = devm_request_threaded_irq(&pdev->dev,
 346                                                 palmas_usb->gpio_vbus_irq,
 347                                                 NULL,
 348                                                 palmas_vbus_irq_handler,
 349                                                 IRQF_TRIGGER_FALLING |
 350                                                 IRQF_TRIGGER_RISING |
 351                                                 IRQF_ONESHOT,
 352                                                 "palmas_usb_vbus",
 353                                                 palmas_usb);
 354                 if (status < 0) {
 355                         dev_err(&pdev->dev,
 356                                 "failed to request handler for vbus irq\n");
 357                         return status;
 358                 }
 359         }
 360
 361         palmas_enable_irq(palmas_usb);
 362         /* perform initial detection */
 363         if (palmas_usb->enable_gpio_vbus_detection)
 364                 palmas_vbus_irq_handler(palmas_usb->gpio_vbus_irq, palmas_usb);
 365         palmas_gpio_id_detect(&palmas_usb->wq_detectid.work);
 366         device_set_wakeup_capable(&pdev->dev, true);
 367         return 0;
 368 }
 369
 370 static int palmas_usb_remove(struct platform_device *pdev)
 371 {
 372         struct palmas_usb *palmas_usb = platform_get_drvdata(pdev);
 373
 374         cancel_delayed_work_sync(&palmas_usb->wq_detectid);
 375
 376         return 0;
 377 }
 378
 379 #ifdef CONFIG_PM_SLEEP
 380 static int palmas_usb_suspend(struct device *dev)
 381 {
 382         struct palmas_usb *palmas_usb = dev_get_drvdata(dev);
 383
 384         if (device_may_wakeup(dev)) {
 385                 if (palmas_usb->enable_vbus_detection)
 386                         enable_irq_wake(palmas_usb->vbus_irq);
 387                 if (palmas_usb->enable_gpio_vbus_detection)
 388                         enable_irq_wake(palmas_usb->gpio_vbus_irq);
 389                 if (palmas_usb->enable_id_detection)
 390                         enable_irq_wake(palmas_usb->id_irq);
 391                 if (palmas_usb->enable_gpio_id_detection)
 392                         enable_irq_wake(palmas_usb->gpio_id_irq);
 393         }
 394         return 0;
 395 }
 396
 397 static int palmas_usb_resume(struct device *dev)
 398 {
 399         struct palmas_usb *palmas_usb = dev_get_drvdata(dev);
 400
 401         if (device_may_wakeup(dev)) {
 402                 if (palmas_usb->enable_vbus_detection)
 403                         disable_irq_wake(palmas_usb->vbus_irq);
 404                 if (palmas_usb->enable_gpio_vbus_detection)
 405                         disable_irq_wake(palmas_usb->gpio_vbus_irq);
 406                 if (palmas_usb->enable_id_detection)
 407                         disable_irq_wake(palmas_usb->id_irq);
 408                 if (palmas_usb->enable_gpio_id_detection)
 409                         disable_irq_wake(palmas_usb->gpio_id_irq);
 410         }
 411         return 0;
 412 };
 413 #endif
 414
 415 static SIMPLE_DEV_PM_OPS(palmas_pm_ops, palmas_usb_suspend, palmas_usb_resume);
 416
 417 static const struct of_device_id of_palmas_match_tbl[] = {
 418         { .compatible = "ti,palmas-usb", },
 419         { .compatible = "ti,palmas-usb-vid", },
 420         { .compatible = "ti,twl6035-usb", },
 421         { .compatible = "ti,twl6035-usb-vid", },
 422         { /* end */ }
 423 };
 424
 425 static struct platform_driver palmas_usb_driver = {
 426         .probe = palmas_usb_probe,
 427         .remove = palmas_usb_remove,
 428         .driver = {
 429                 .name = "palmas-usb",
 430                 .of_match_table = of_palmas_match_tbl,
 431                 .pm = &palmas_pm_ops,
 432         },
 433 };
 434
 435 module_platform_driver(palmas_usb_driver);
 436
 437 MODULE_ALIAS("platform:palmas-usb");
 438 MODULE_AUTHOR("Graeme Gregory <gg@slimlogic.co.uk>");
 439 MODULE_DESCRIPTION("Palmas USB transceiver driver");
 440 MODULE_LICENSE("GPL");
 441 MODULE_DEVICE_TABLE(of, of_palmas_match_tbl);