kernel/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
  32 static const char *palmas_extcon_cable[] = {
  33         [0] = "USB",
  34         [1] = "USB-HOST",
  35         NULL,
  36 };
  37
  38 static const int mutually_exclusive[] = {0x3, 0x0};
  39
  40 static void palmas_usb_wakeup(struct palmas *palmas, int enable)
  41 {
  42         if (enable)
  43                 palmas_write(palmas, PALMAS_USB_OTG_BASE, PALMAS_USB_WAKEUP,
  44                         PALMAS_USB_WAKEUP_ID_WK_UP_COMP);
  45         else
  46                 palmas_write(palmas, PALMAS_USB_OTG_BASE, PALMAS_USB_WAKEUP, 0);
  47 }
  48
  49 static irqreturn_t palmas_vbus_irq_handler(int irq, void *_palmas_usb)
  50 {
  51         struct palmas_usb *palmas_usb = _palmas_usb;
  52         unsigned int vbus_line_state;
  53
  54         palmas_read(palmas_usb->palmas, PALMAS_INTERRUPT_BASE,
  55                 PALMAS_INT3_LINE_STATE, &vbus_line_state);
  56
  57         if (vbus_line_state & PALMAS_INT3_LINE_STATE_VBUS) {
  58                 if (palmas_usb->linkstat != PALMAS_USB_STATE_VBUS) {
  59                         palmas_usb->linkstat = PALMAS_USB_STATE_VBUS;
  60                         extcon_set_cable_state(palmas_usb->edev, "USB", true);
  61                         dev_info(palmas_usb->dev, "USB cable is attached\n");
  62                 } else {
  63                         dev_dbg(palmas_usb->dev,
  64                                 "Spurious connect event detected\n");
  65                 }
  66         } else if (!(vbus_line_state & PALMAS_INT3_LINE_STATE_VBUS)) {
  67                 if (palmas_usb->linkstat == PALMAS_USB_STATE_VBUS) {
  68                         palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
  69                         extcon_set_cable_state(palmas_usb->edev, "USB", false);
  70                         dev_info(palmas_usb->dev, "USB cable is detached\n");
  71                 } else {
  72                         dev_dbg(palmas_usb->dev,
  73                                 "Spurious disconnect event detected\n");
  74                 }
  75         }
  76
  77         return IRQ_HANDLED;
  78 }
  79
  80 static irqreturn_t palmas_id_irq_handler(int irq, void *_palmas_usb)
  81 {
  82         unsigned int set, id_src;
  83         struct palmas_usb *palmas_usb = _palmas_usb;
  84
  85         palmas_read(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
  86                 PALMAS_USB_ID_INT_LATCH_SET, &set);
  87         palmas_read(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
  88                 PALMAS_USB_ID_INT_SRC, &id_src);
  89
  90         if ((set & PALMAS_USB_ID_INT_SRC_ID_GND) &&
  91                                 (id_src & PALMAS_USB_ID_INT_SRC_ID_GND)) {
  92                 palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
  93                         PALMAS_USB_ID_INT_LATCH_CLR,
  94                         PALMAS_USB_ID_INT_EN_HI_CLR_ID_GND);
  95                 palmas_usb->linkstat = PALMAS_USB_STATE_ID;
  96                 extcon_set_cable_state(palmas_usb->edev, "USB-HOST", true);
  97                 dev_info(palmas_usb->dev, "USB-HOST cable is attached\n");
  98         } else if ((set & PALMAS_USB_ID_INT_SRC_ID_FLOAT) &&
  99                                 (id_src & PALMAS_USB_ID_INT_SRC_ID_FLOAT)) {
 100                 palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
 101                         PALMAS_USB_ID_INT_LATCH_CLR,
 102                         PALMAS_USB_ID_INT_EN_HI_CLR_ID_FLOAT);
 103                 palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
 104                 extcon_set_cable_state(palmas_usb->edev, "USB-HOST", false);
 105                 dev_info(palmas_usb->dev, "USB-HOST cable is detached\n");
 106         } else if ((palmas_usb->linkstat == PALMAS_USB_STATE_ID) &&
 107                                 (!(set & PALMAS_USB_ID_INT_SRC_ID_GND))) {
 108                 palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
 109                 extcon_set_cable_state(palmas_usb->edev, "USB-HOST", false);
 110                 dev_info(palmas_usb->dev, "USB-HOST cable is detached\n");
 111         } else if ((palmas_usb->linkstat == PALMAS_USB_STATE_DISCONNECT) &&
 112                                 (id_src & PALMAS_USB_ID_INT_SRC_ID_GND)) {
 113                 palmas_usb->linkstat = PALMAS_USB_STATE_ID;
 114                 extcon_set_cable_state(palmas_usb->edev, "USB-HOST", true);
 115                 dev_info(palmas_usb->dev, " USB-HOST cable is attached\n");
 116         }
 117
 118         return IRQ_HANDLED;
 119 }
 120
 121 static void palmas_enable_irq(struct palmas_usb *palmas_usb)
 122 {
 123         palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
 124                 PALMAS_USB_VBUS_CTRL_SET,
 125                 PALMAS_USB_VBUS_CTRL_SET_VBUS_ACT_COMP);
 126
 127         palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
 128                 PALMAS_USB_ID_CTRL_SET, PALMAS_USB_ID_CTRL_SET_ID_ACT_COMP);
 129
 130         palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
 131                 PALMAS_USB_ID_INT_EN_HI_SET,
 132                 PALMAS_USB_ID_INT_EN_HI_SET_ID_GND |
 133                 PALMAS_USB_ID_INT_EN_HI_SET_ID_FLOAT);
 134
 135         if (palmas_usb->enable_vbus_detection)
 136                 palmas_vbus_irq_handler(palmas_usb->vbus_irq, palmas_usb);
 137
 138         /* cold plug for host mode needs this delay */
 139         if (palmas_usb->enable_id_detection) {
 140                 msleep(30);
 141                 palmas_id_irq_handler(palmas_usb->id_irq, palmas_usb);
 142         }
 143 }
 144
 145 static int palmas_usb_probe(struct platform_device *pdev)
 146 {
 147         struct palmas *palmas = dev_get_drvdata(pdev->dev.parent);
 148         struct palmas_usb_platform_data *pdata = dev_get_platdata(&pdev->dev);
 149         struct device_node *node = pdev->dev.of_node;
 150         struct palmas_usb *palmas_usb;
 151         int status;
 152
 153         palmas_usb = devm_kzalloc(&pdev->dev, sizeof(*palmas_usb), GFP_KERNEL);
 154         if (!palmas_usb)
 155                 return -ENOMEM;
 156
 157         if (node && !pdata) {
 158                 palmas_usb->wakeup = of_property_read_bool(node, "ti,wakeup");
 159                 palmas_usb->enable_id_detection = of_property_read_bool(node,
 160                                                 "ti,enable-id-detection");
 161                 palmas_usb->enable_vbus_detection = of_property_read_bool(node,
 162                                                 "ti,enable-vbus-detection");
 163         } else {
 164                 palmas_usb->wakeup = true;
 165                 palmas_usb->enable_id_detection = true;
 166                 palmas_usb->enable_vbus_detection = true;
 167
 168                 if (pdata)
 169                         palmas_usb->wakeup = pdata->wakeup;
 170         }
 171
 172         palmas->usb = palmas_usb;
 173         palmas_usb->palmas = palmas;
 174
 175         palmas_usb->dev  = &pdev->dev;
 176
 177         palmas_usb->id_otg_irq = regmap_irq_get_virq(palmas->irq_data,
 178                                                 PALMAS_ID_OTG_IRQ);
 179         palmas_usb->id_irq = regmap_irq_get_virq(palmas->irq_data,
 180                                                 PALMAS_ID_IRQ);
 181         palmas_usb->vbus_otg_irq = regmap_irq_get_virq(palmas->irq_data,
 182                                                 PALMAS_VBUS_OTG_IRQ);
 183         palmas_usb->vbus_irq = regmap_irq_get_virq(palmas->irq_data,
 184                                                 PALMAS_VBUS_IRQ);
 185
 186         palmas_usb_wakeup(palmas, palmas_usb->wakeup);
 187
 188         platform_set_drvdata(pdev, palmas_usb);
 189
 190         palmas_usb->edev = devm_extcon_dev_allocate(&pdev->dev,
 191                                                     palmas_extcon_cable);
 192         if (IS_ERR(palmas_usb->edev)) {
 193                 dev_err(&pdev->dev, "failed to allocate extcon device\n");
 194                 return -ENOMEM;
 195         }
 196         palmas_usb->edev->name = kstrdup(node->name, GFP_KERNEL);
 197         palmas_usb->edev->mutually_exclusive = mutually_exclusive;
 198
 199         status = devm_extcon_dev_register(&pdev->dev, palmas_usb->edev);
 200         if (status) {
 201                 dev_err(&pdev->dev, "failed to register extcon device\n");
 202                 kfree(palmas_usb->edev->name);
 203                 return status;
 204         }
 205
 206         if (palmas_usb->enable_id_detection) {
 207                 status = devm_request_threaded_irq(palmas_usb->dev,
 208                                 palmas_usb->id_irq,
 209                                 NULL, palmas_id_irq_handler,
 210                                 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING |
 211                                 IRQF_ONESHOT | IRQF_EARLY_RESUME,
 212                                 "palmas_usb_id", palmas_usb);
 213                 if (status < 0) {
 214                         dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
 215                                         palmas_usb->id_irq, status);
 216                         kfree(palmas_usb->edev->name);
 217                         return status;
 218                 }
 219         }
 220
 221         if (palmas_usb->enable_vbus_detection) {
 222                 status = devm_request_threaded_irq(palmas_usb->dev,
 223                                 palmas_usb->vbus_irq, NULL,
 224                                 palmas_vbus_irq_handler,
 225                                 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING |
 226                                 IRQF_ONESHOT | IRQF_EARLY_RESUME,
 227                                 "palmas_usb_vbus", palmas_usb);
 228                 if (status < 0) {
 229                         dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
 230                                         palmas_usb->vbus_irq, status);
 231                         kfree(palmas_usb->edev->name);
 232                         return status;
 233                 }
 234         }
 235
 236         palmas_enable_irq(palmas_usb);
 237         device_set_wakeup_capable(&pdev->dev, true);
 238         return 0;
 239 }
 240
 241 static int palmas_usb_remove(struct platform_device *pdev)
 242 {
 243         struct palmas_usb *palmas_usb = platform_get_drvdata(pdev);
 244
 245         kfree(palmas_usb->edev->name);
 246
 247         return 0;
 248 }
 249
 250 #ifdef CONFIG_PM_SLEEP
 251 static int palmas_usb_suspend(struct device *dev)
 252 {
 253         struct palmas_usb *palmas_usb = dev_get_drvdata(dev);
 254
 255         if (device_may_wakeup(dev)) {
 256                 if (palmas_usb->enable_vbus_detection)
 257                         enable_irq_wake(palmas_usb->vbus_irq);
 258                 if (palmas_usb->enable_id_detection)
 259                         enable_irq_wake(palmas_usb->id_irq);
 260         }
 261         return 0;
 262 }
 263
 264 static int palmas_usb_resume(struct device *dev)
 265 {
 266         struct palmas_usb *palmas_usb = dev_get_drvdata(dev);
 267
 268         if (device_may_wakeup(dev)) {
 269                 if (palmas_usb->enable_vbus_detection)
 270                         disable_irq_wake(palmas_usb->vbus_irq);
 271                 if (palmas_usb->enable_id_detection)
 272                         disable_irq_wake(palmas_usb->id_irq);
 273         }
 274         return 0;
 275 };
 276 #endif
 277
 278 static SIMPLE_DEV_PM_OPS(palmas_pm_ops, palmas_usb_suspend, palmas_usb_resume);
 279
 280 static const struct of_device_id of_palmas_match_tbl[] = {
 281         { .compatible = "ti,palmas-usb", },
 282         { .compatible = "ti,palmas-usb-vid", },
 283         { .compatible = "ti,twl6035-usb", },
 284         { .compatible = "ti,twl6035-usb-vid", },
 285         { /* end */ }
 286 };
 287
 288 static struct platform_driver palmas_usb_driver = {
 289         .probe = palmas_usb_probe,
 290         .remove = palmas_usb_remove,
 291         .driver = {
 292                 .name = "palmas-usb",
 293                 .of_match_table = of_palmas_match_tbl,
 294                 .pm = &palmas_pm_ops,
 295         },
 296 };
 297
 298 module_platform_driver(palmas_usb_driver);
 299
 300 MODULE_ALIAS("platform:palmas-usb");
 301 MODULE_AUTHOR("Graeme Gregory <gg@slimlogic.co.uk>");
 302 MODULE_DESCRIPTION("Palmas USB transceiver driver");
 303 MODULE_LICENSE("GPL");
 304 MODULE_DEVICE_TABLE(of, of_palmas_match_tbl);