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