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         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_gpio_id_detection) {
 225                 u32 debounce;
 226
 227                 if (of_property_read_u32(node, "debounce-delay-ms", &debounce))
 228                         debounce = USB_GPIO_DEBOUNCE_MS;
 229
 230                 status = gpiod_set_debounce(palmas_usb->id_gpiod,
 231                                             debounce * 1000);
 232                 if (status < 0)
 233                         palmas_usb->sw_debounce_jiffies = msecs_to_jiffies(debounce);
 234         }
 235
 236         INIT_DELAYED_WORK(&palmas_usb->wq_detectid, palmas_gpio_id_detect);
 237
 238         palmas->usb = palmas_usb;
 239         palmas_usb->palmas = palmas;
 240
 241         palmas_usb->dev  = &pdev->dev;
 242
 243         palmas_usb_wakeup(palmas, palmas_usb->wakeup);
 244
 245         platform_set_drvdata(pdev, palmas_usb);
 246
 247         palmas_usb->edev = devm_extcon_dev_allocate(&pdev->dev,
 248                                                     palmas_extcon_cable);
 249         if (IS_ERR(palmas_usb->edev)) {
 250                 dev_err(&pdev->dev, "failed to allocate extcon device\n");
 251                 return -ENOMEM;
 252         }
 253
 254         status = devm_extcon_dev_register(&pdev->dev, palmas_usb->edev);
 255         if (status) {
 256                 dev_err(&pdev->dev, "failed to register extcon device\n");
 257                 return status;
 258         }
 259
 260         if (palmas_usb->enable_id_detection) {
 261                 palmas_usb->id_otg_irq = regmap_irq_get_virq(palmas->irq_data,
 262                                                              PALMAS_ID_OTG_IRQ);
 263                 palmas_usb->id_irq = regmap_irq_get_virq(palmas->irq_data,
 264                                                          PALMAS_ID_IRQ);
 265                 status = devm_request_threaded_irq(palmas_usb->dev,
 266                                 palmas_usb->id_irq,
 267                                 NULL, palmas_id_irq_handler,
 268                                 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING |
 269                                 IRQF_ONESHOT | IRQF_EARLY_RESUME,
 270                                 "palmas_usb_id", palmas_usb);
 271                 if (status < 0) {
 272                         dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
 273                                         palmas_usb->id_irq, status);
 274                         return status;
 275                 }
 276         } else if (palmas_usb->enable_gpio_id_detection) {
 277                 palmas_usb->gpio_id_irq = gpiod_to_irq(palmas_usb->id_gpiod);
 278                 if (palmas_usb->gpio_id_irq < 0) {
 279                         dev_err(&pdev->dev, "failed to get id irq\n");
 280                         return palmas_usb->gpio_id_irq;
 281                 }
 282                 status = devm_request_threaded_irq(&pdev->dev,
 283                                                    palmas_usb->gpio_id_irq,
 284                                                    NULL,
 285                                                    palmas_gpio_id_irq_handler,
 286                                                    IRQF_TRIGGER_RISING |
 287                                                    IRQF_TRIGGER_FALLING |
 288                                                    IRQF_ONESHOT,
 289                                                    "palmas_usb_id",
 290                                                    palmas_usb);
 291                 if (status < 0) {
 292                         dev_err(&pdev->dev,
 293                                 "failed to request handler for id irq\n");
 294                         return status;
 295                 }
 296         }
 297
 298         if (palmas_usb->enable_vbus_detection) {
 299                 palmas_usb->vbus_otg_irq = regmap_irq_get_virq(palmas->irq_data,
 300                                                        PALMAS_VBUS_OTG_IRQ);
 301                 palmas_usb->vbus_irq = regmap_irq_get_virq(palmas->irq_data,
 302                                                            PALMAS_VBUS_IRQ);
 303                 status = devm_request_threaded_irq(palmas_usb->dev,
 304                                 palmas_usb->vbus_irq, NULL,
 305                                 palmas_vbus_irq_handler,
 306                                 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING |
 307                                 IRQF_ONESHOT | IRQF_EARLY_RESUME,
 308                                 "palmas_usb_vbus", palmas_usb);
 309                 if (status < 0) {
 310                         dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
 311                                         palmas_usb->vbus_irq, status);
 312                         return status;
 313                 }
 314         }
 315
 316         palmas_enable_irq(palmas_usb);
 317         /* perform initial detection */
 318         palmas_gpio_id_detect(&palmas_usb->wq_detectid.work);
 319         device_set_wakeup_capable(&pdev->dev, true);
 320         return 0;
 321 }
 322
 323 static int palmas_usb_remove(struct platform_device *pdev)
 324 {
 325         struct palmas_usb *palmas_usb = platform_get_drvdata(pdev);
 326
 327         cancel_delayed_work_sync(&palmas_usb->wq_detectid);
 328
 329         return 0;
 330 }
 331
 332 #ifdef CONFIG_PM_SLEEP
 333 static int palmas_usb_suspend(struct device *dev)
 334 {
 335         struct palmas_usb *palmas_usb = dev_get_drvdata(dev);
 336
 337         if (device_may_wakeup(dev)) {
 338                 if (palmas_usb->enable_vbus_detection)
 339                         enable_irq_wake(palmas_usb->vbus_irq);
 340                 if (palmas_usb->enable_id_detection)
 341                         enable_irq_wake(palmas_usb->id_irq);
 342                 if (palmas_usb->enable_gpio_id_detection)
 343                         enable_irq_wake(palmas_usb->gpio_id_irq);
 344         }
 345         return 0;
 346 }
 347
 348 static int palmas_usb_resume(struct device *dev)
 349 {
 350         struct palmas_usb *palmas_usb = dev_get_drvdata(dev);
 351
 352         if (device_may_wakeup(dev)) {
 353                 if (palmas_usb->enable_vbus_detection)
 354                         disable_irq_wake(palmas_usb->vbus_irq);
 355                 if (palmas_usb->enable_id_detection)
 356                         disable_irq_wake(palmas_usb->id_irq);
 357                 if (palmas_usb->enable_gpio_id_detection)
 358                         disable_irq_wake(palmas_usb->gpio_id_irq);
 359         }
 360         return 0;
 361 };
 362 #endif
 363
 364 static SIMPLE_DEV_PM_OPS(palmas_pm_ops, palmas_usb_suspend, palmas_usb_resume);
 365
 366 static const struct of_device_id of_palmas_match_tbl[] = {
 367         { .compatible = "ti,palmas-usb", },
 368         { .compatible = "ti,palmas-usb-vid", },
 369         { .compatible = "ti,twl6035-usb", },
 370         { .compatible = "ti,twl6035-usb-vid", },
 371         { /* end */ }
 372 };
 373
 374 static struct platform_driver palmas_usb_driver = {
 375         .probe = palmas_usb_probe,
 376         .remove = palmas_usb_remove,
 377         .driver = {
 378                 .name = "palmas-usb",
 379                 .of_match_table = of_palmas_match_tbl,
 380                 .pm = &palmas_pm_ops,
 381         },
 382 };
 383
 384 module_platform_driver(palmas_usb_driver);
 385
 386 MODULE_ALIAS("platform:palmas-usb");
 387 MODULE_AUTHOR("Graeme Gregory <gg@slimlogic.co.uk>");
 388 MODULE_DESCRIPTION("Palmas USB transceiver driver");
 389 MODULE_LICENSE("GPL");
 390 MODULE_DEVICE_TABLE(of, of_palmas_match_tbl);