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