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/workqueue.h>
  33
  34 #define USB_GPIO_DEBOUNCE_MS    20      /* ms */
  35
  36 static const unsigned int palmas_extcon_cable[] = {
  37         EXTCON_USB,
  38         EXTCON_USB_HOST,
  39         EXTCON_NONE,
  40 };
  41
  42 static void palmas_usb_wakeup(struct palmas *palmas, int enable)
  43 {
  44         if (enable)
  45                 palmas_write(palmas, PALMAS_USB_OTG_BASE, PALMAS_USB_WAKEUP,
  46                         PALMAS_USB_WAKEUP_ID_WK_UP_COMP);
  47         else
  48                 palmas_write(palmas, PALMAS_USB_OTG_BASE, PALMAS_USB_WAKEUP, 0);
  49 }
  50
  51 static irqreturn_t palmas_vbus_irq_handler(int irq, void *_palmas_usb)
  52 {
  53         struct palmas_usb *palmas_usb = _palmas_usb;
  54         struct extcon_dev *edev = palmas_usb->edev;
  55         unsigned int vbus_line_state;
  56
  57         palmas_read(palmas_usb->palmas, PALMAS_INTERRUPT_BASE,
  58                 PALMAS_INT3_LINE_STATE, &vbus_line_state);
  59
  60         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_VBUS;
  63                         extcon_set_cable_state_(edev, EXTCON_USB, true);
  64                         dev_info(palmas_usb->dev, "USB cable is attached\n");
  65                 } else {
  66                         dev_dbg(palmas_usb->dev,
  67                                 "Spurious connect event detected\n");
  68                 }
  69         } else if (!(vbus_line_state & PALMAS_INT3_LINE_STATE_VBUS)) {
  70                 if (palmas_usb->linkstat == PALMAS_USB_STATE_VBUS) {
  71                         palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
  72                         extcon_set_cable_state_(edev, EXTCON_USB, false);
  73                         dev_info(palmas_usb->dev, "USB cable is detached\n");
  74                 } else {
  75                         dev_dbg(palmas_usb->dev,
  76                                 "Spurious disconnect event detected\n");
  77                 }
  78         }
  79
  80         return IRQ_HANDLED;
  81 }
  82
  83 static irqreturn_t palmas_id_irq_handler(int irq, void *_palmas_usb)
  84 {
  85         unsigned int set, id_src;
  86         struct palmas_usb *palmas_usb = _palmas_usb;
  87         struct extcon_dev *edev = palmas_usb->edev;
  88
  89         palmas_read(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
  90                 PALMAS_USB_ID_INT_LATCH_SET, &set);
  91         palmas_read(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
  92                 PALMAS_USB_ID_INT_SRC, &id_src);
  93
  94         if ((set & PALMAS_USB_ID_INT_SRC_ID_GND) &&
  95                                 (id_src & PALMAS_USB_ID_INT_SRC_ID_GND)) {
  96                 palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
  97                         PALMAS_USB_ID_INT_LATCH_CLR,
  98                         PALMAS_USB_ID_INT_EN_HI_CLR_ID_GND);
  99                 palmas_usb->linkstat = PALMAS_USB_STATE_ID;
 100                 extcon_set_cable_state_(edev, EXTCON_USB_HOST, true);
 101                 dev_info(palmas_usb->dev, "USB-HOST cable is attached\n");
 102         } else if ((set & PALMAS_USB_ID_INT_SRC_ID_FLOAT) &&
 103                                 (id_src & PALMAS_USB_ID_INT_SRC_ID_FLOAT)) {
 104                 palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
 105                         PALMAS_USB_ID_INT_LATCH_CLR,
 106                         PALMAS_USB_ID_INT_EN_HI_CLR_ID_FLOAT);
 107                 palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
 108                 extcon_set_cable_state_(edev, EXTCON_USB_HOST, false);
 109                 dev_info(palmas_usb->dev, "USB-HOST cable is detached\n");
 110         } else if ((palmas_usb->linkstat == PALMAS_USB_STATE_ID) &&
 111                                 (!(set & PALMAS_USB_ID_INT_SRC_ID_GND))) {
 112                 palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
 113                 extcon_set_cable_state_(edev, EXTCON_USB_HOST, false);
 114                 dev_info(palmas_usb->dev, "USB-HOST cable is detached\n");
 115         } else if ((palmas_usb->linkstat == PALMAS_USB_STATE_DISCONNECT) &&
 116                                 (id_src & PALMAS_USB_ID_INT_SRC_ID_GND)) {
 117                 palmas_usb->linkstat = PALMAS_USB_STATE_ID;
 118                 extcon_set_cable_state_(edev, EXTCON_USB_HOST, true);
 119                 dev_info(palmas_usb->dev, " USB-HOST cable is attached\n");
 120         }
 121
 122         return IRQ_HANDLED;
 123 }
 124
 125 static void palmas_gpio_id_detect(struct work_struct *work)
 126 {
 127         int id;
 128         struct palmas_usb *palmas_usb = container_of(to_delayed_work(work),
 129                                                      struct palmas_usb,
 130                                                      wq_detectid);
 131         struct extcon_dev *edev = palmas_usb->edev;
 132
 133         if (!palmas_usb->id_gpiod)
 134                 return;
 135
 136         id = gpiod_get_value_cansleep(palmas_usb->id_gpiod);
 137
 138         if (id) {
 139                 extcon_set_cable_state_(edev, EXTCON_USB_HOST, false);
 140                 dev_info(palmas_usb->dev, "USB-HOST cable is detached\n");
 141         } else {
 142                 extcon_set_cable_state_(edev, EXTCON_USB_HOST, true);
 143                 dev_info(palmas_usb->dev, "USB-HOST cable is attached\n");
 144         }
 145 }
 146
 147 static irqreturn_t palmas_gpio_id_irq_handler(int irq, void *_palmas_usb)
 148 {
 149         struct palmas_usb *palmas_usb = _palmas_usb;
 150
 151         queue_delayed_work(system_power_efficient_wq, &palmas_usb->wq_detectid,
 152                            palmas_usb->sw_debounce_jiffies);
 153
 154         return IRQ_HANDLED;
 155 }
 156
 157 static void palmas_enable_irq(struct palmas_usb *palmas_usb)
 158 {
 159         palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
 160                 PALMAS_USB_VBUS_CTRL_SET,
 161                 PALMAS_USB_VBUS_CTRL_SET_VBUS_ACT_COMP);
 162
 163         if (palmas_usb->enable_id_detection) {
 164                 palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
 165                              PALMAS_USB_ID_CTRL_SET,
 166                              PALMAS_USB_ID_CTRL_SET_ID_ACT_COMP);
 167
 168                 palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
 169                              PALMAS_USB_ID_INT_EN_HI_SET,
 170                              PALMAS_USB_ID_INT_EN_HI_SET_ID_GND |
 171                              PALMAS_USB_ID_INT_EN_HI_SET_ID_FLOAT);
 172         }
 173
 174         if (palmas_usb->enable_vbus_detection)
 175                 palmas_vbus_irq_handler(palmas_usb->vbus_irq, palmas_usb);
 176
 177         /* cold plug for host mode needs this delay */
 178         if (palmas_usb->enable_id_detection) {
 179                 msleep(30);
 180                 palmas_id_irq_handler(palmas_usb->id_irq, palmas_usb);
 181         }
 182 }
 183
 184 static int palmas_usb_probe(struct platform_device *pdev)
 185 {
 186         struct palmas *palmas = dev_get_drvdata(pdev->dev.parent);
 187         struct palmas_usb_platform_data *pdata = dev_get_platdata(&pdev->dev);
 188         struct device_node *node = pdev->dev.of_node;
 189         struct palmas_usb *palmas_usb;
 190         int status;
 191
 192         palmas_usb = devm_kzalloc(&pdev->dev, sizeof(*palmas_usb), GFP_KERNEL);
 193         if (!palmas_usb)
 194                 return -ENOMEM;
 195
 196         if (node && !pdata) {
 197                 palmas_usb->wakeup = of_property_read_bool(node, "ti,wakeup");
 198                 palmas_usb->enable_id_detection = of_property_read_bool(node,
 199                                                 "ti,enable-id-detection");
 200                 palmas_usb->enable_vbus_detection = of_property_read_bool(node,
 201                                                 "ti,enable-vbus-detection");
 202         } else {
 203                 palmas_usb->wakeup = true;
 204                 palmas_usb->enable_id_detection = true;
 205                 palmas_usb->enable_vbus_detection = true;
 206
 207                 if (pdata)
 208                         palmas_usb->wakeup = pdata->wakeup;
 209         }
 210
 211         palmas_usb->id_gpiod = devm_gpiod_get_optional(&pdev->dev, "id");
 212         if (IS_ERR(palmas_usb->id_gpiod)) {
 213                 dev_err(&pdev->dev, "failed to get id gpio\n");
 214                 return PTR_ERR(palmas_usb->id_gpiod);
 215         }
 216
 217         if (palmas_usb->enable_id_detection && palmas_usb->id_gpiod) {
 218                 palmas_usb->enable_id_detection = false;
 219                 palmas_usb->enable_gpio_id_detection = true;
 220         }
 221
 222         if (palmas_usb->enable_gpio_id_detection) {
 223                 u32 debounce;
 224
 225                 if (of_property_read_u32(node, "debounce-delay-ms", &debounce))
 226                         debounce = USB_GPIO_DEBOUNCE_MS;
 227
 228                 status = gpiod_set_debounce(palmas_usb->id_gpiod,
 229                                             debounce * 1000);
 230                 if (status < 0)
 231                         palmas_usb->sw_debounce_jiffies = msecs_to_jiffies(debounce);
 232         }
 233
 234         INIT_DELAYED_WORK(&palmas_usb->wq_detectid, palmas_gpio_id_detect);
 235
 236         palmas->usb = palmas_usb;
 237         palmas_usb->palmas = palmas;
 238
 239         palmas_usb->dev  = &pdev->dev;
 240
 241         palmas_usb_wakeup(palmas, palmas_usb->wakeup);
 242
 243         platform_set_drvdata(pdev, palmas_usb);
 244
 245         palmas_usb->edev = devm_extcon_dev_allocate(&pdev->dev,
 246                                                     palmas_extcon_cable);
 247         if (IS_ERR(palmas_usb->edev)) {
 248                 dev_err(&pdev->dev, "failed to allocate extcon device\n");
 249                 return -ENOMEM;
 250         }
 251
 252         status = devm_extcon_dev_register(&pdev->dev, palmas_usb->edev);
 253         if (status) {
 254                 dev_err(&pdev->dev, "failed to register extcon device\n");
 255                 return status;
 256         }
 257
 258         if (palmas_usb->enable_id_detection) {
 259                 palmas_usb->id_otg_irq = regmap_irq_get_virq(palmas->irq_data,
 260                                                              PALMAS_ID_OTG_IRQ);
 261                 palmas_usb->id_irq = regmap_irq_get_virq(palmas->irq_data,
 262                                                          PALMAS_ID_IRQ);
 263                 status = devm_request_threaded_irq(palmas_usb->dev,
 264                                 palmas_usb->id_irq,
 265                                 NULL, palmas_id_irq_handler,
 266                                 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING |
 267                                 IRQF_ONESHOT | IRQF_EARLY_RESUME,
 268                                 "palmas_usb_id", palmas_usb);
 269                 if (status < 0) {
 270                         dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
 271                                         palmas_usb->id_irq, status);
 272                         return status;
 273                 }
 274         } else if (palmas_usb->enable_gpio_id_detection) {
 275                 palmas_usb->gpio_id_irq = gpiod_to_irq(palmas_usb->id_gpiod);
 276                 if (palmas_usb->gpio_id_irq < 0) {
 277                         dev_err(&pdev->dev, "failed to get id irq\n");
 278                         return palmas_usb->gpio_id_irq;
 279                 }
 280                 status = devm_request_threaded_irq(&pdev->dev,
 281                                                    palmas_usb->gpio_id_irq,
 282                                                    NULL,
 283                                                    palmas_gpio_id_irq_handler,
 284                                                    IRQF_TRIGGER_RISING |
 285                                                    IRQF_TRIGGER_FALLING |
 286                                                    IRQF_ONESHOT,
 287                                                    "palmas_usb_id",
 288                                                    palmas_usb);
 289                 if (status < 0) {
 290                         dev_err(&pdev->dev,
 291                                 "failed to request handler for id irq\n");
 292                         return status;
 293                 }
 294         }
 295
 296         if (palmas_usb->enable_vbus_detection) {
 297                 palmas_usb->vbus_otg_irq = regmap_irq_get_virq(palmas->irq_data,
 298                                                        PALMAS_VBUS_OTG_IRQ);
 299                 palmas_usb->vbus_irq = regmap_irq_get_virq(palmas->irq_data,
 300                                                            PALMAS_VBUS_IRQ);
 301                 status = devm_request_threaded_irq(palmas_usb->dev,
 302                                 palmas_usb->vbus_irq, NULL,
 303                                 palmas_vbus_irq_handler,
 304                                 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING |
 305                                 IRQF_ONESHOT | IRQF_EARLY_RESUME,
 306                                 "palmas_usb_vbus", palmas_usb);
 307                 if (status < 0) {
 308                         dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
 309                                         palmas_usb->vbus_irq, status);
 310                         return status;
 311                 }
 312         }
 313
 314         palmas_enable_irq(palmas_usb);
 315         /* perform initial detection */
 316         palmas_gpio_id_detect(&palmas_usb->wq_detectid.work);
 317         device_set_wakeup_capable(&pdev->dev, true);
 318         return 0;
 319 }
 320
 321 static int palmas_usb_remove(struct platform_device *pdev)
 322 {
 323         struct palmas_usb *palmas_usb = platform_get_drvdata(pdev);
 324
 325         cancel_delayed_work_sync(&palmas_usb->wq_detectid);
 326
 327         return 0;
 328 }
 329
 330 #ifdef CONFIG_PM_SLEEP
 331 static int palmas_usb_suspend(struct device *dev)
 332 {
 333         struct palmas_usb *palmas_usb = dev_get_drvdata(dev);
 334
 335         if (device_may_wakeup(dev)) {
 336                 if (palmas_usb->enable_vbus_detection)
 337                         enable_irq_wake(palmas_usb->vbus_irq);
 338                 if (palmas_usb->enable_id_detection)
 339                         enable_irq_wake(palmas_usb->id_irq);
 340                 if (palmas_usb->enable_gpio_id_detection)
 341                         enable_irq_wake(palmas_usb->gpio_id_irq);
 342         }
 343         return 0;
 344 }
 345
 346 static int palmas_usb_resume(struct device *dev)
 347 {
 348         struct palmas_usb *palmas_usb = dev_get_drvdata(dev);
 349
 350         if (device_may_wakeup(dev)) {
 351                 if (palmas_usb->enable_vbus_detection)
 352                         disable_irq_wake(palmas_usb->vbus_irq);
 353                 if (palmas_usb->enable_id_detection)
 354                         disable_irq_wake(palmas_usb->id_irq);
 355                 if (palmas_usb->enable_gpio_id_detection)
 356                         disable_irq_wake(palmas_usb->gpio_id_irq);
 357         }
 358         return 0;
 359 };
 360 #endif
 361
 362 static SIMPLE_DEV_PM_OPS(palmas_pm_ops, palmas_usb_suspend, palmas_usb_resume);
 363
 364 static const struct of_device_id of_palmas_match_tbl[] = {
 365         { .compatible = "ti,palmas-usb", },
 366         { .compatible = "ti,palmas-usb-vid", },
 367         { .compatible = "ti,twl6035-usb", },
 368         { .compatible = "ti,twl6035-usb-vid", },
 369         { /* end */ }
 370 };
 371
 372 static struct platform_driver palmas_usb_driver = {
 373         .probe = palmas_usb_probe,
 374         .remove = palmas_usb_remove,
 375         .driver = {
 376                 .name = "palmas-usb",
 377                 .of_match_table = of_palmas_match_tbl,
 378                 .pm = &palmas_pm_ops,
 379         },
 380 };
 381
 382 module_platform_driver(palmas_usb_driver);
 383
 384 MODULE_ALIAS("platform:palmas-usb");
 385 MODULE_AUTHOR("Graeme Gregory <gg@slimlogic.co.uk>");
 386 MODULE_DESCRIPTION("Palmas USB transceiver driver");
 387 MODULE_LICENSE("GPL");
 388 MODULE_DEVICE_TABLE(of, of_palmas_match_tbl);