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 = pdev->dev.platform_data;
 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.mutually_exclusive = mutually_exclusive;
 182
 183         status = extcon_dev_register(&palmas_usb->edev, palmas_usb->dev);
 184         if (status) {
 185                 dev_err(&pdev->dev, "failed to register extcon device\n");
 186                 return status;
 187         }
 188
 189         if (palmas_usb->enable_id_detection) {
 190                 status = devm_request_threaded_irq(palmas_usb->dev,
 191                                 palmas_usb->id_irq,
 192                                 NULL, palmas_id_irq_handler,
 193                                 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING |
 194                                 IRQF_ONESHOT | IRQF_EARLY_RESUME,
 195                                 "palmas_usb_id", palmas_usb);
 196                 if (status < 0) {
 197                         dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
 198                                         palmas_usb->id_irq, status);
 199                         goto fail_extcon;
 200                 }
 201         }
 202
 203         if (palmas_usb->enable_vbus_detection) {
 204                 status = devm_request_threaded_irq(palmas_usb->dev,
 205                                 palmas_usb->vbus_irq, NULL,
 206                                 palmas_vbus_irq_handler,
 207                                 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING |
 208                                 IRQF_ONESHOT | IRQF_EARLY_RESUME,
 209                                 "palmas_usb_vbus", palmas_usb);
 210                 if (status < 0) {
 211                         dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
 212                                         palmas_usb->vbus_irq, status);
 213                         goto fail_extcon;
 214                 }
 215         }
 216
 217         palmas_enable_irq(palmas_usb);
 218         device_set_wakeup_capable(&pdev->dev, true);
 219         return 0;
 220
 221 fail_extcon:
 222         extcon_dev_unregister(&palmas_usb->edev);
 223
 224         return status;
 225 }
 226
 227 static int palmas_usb_remove(struct platform_device *pdev)
 228 {
 229         struct palmas_usb *palmas_usb = platform_get_drvdata(pdev);
 230
 231         extcon_dev_unregister(&palmas_usb->edev);
 232
 233         return 0;
 234 }
 235
 236 #ifdef CONFIG_PM_SLEEP
 237 static int palmas_usb_suspend(struct device *dev)
 238 {
 239         struct palmas_usb *palmas_usb = dev_get_drvdata(dev);
 240
 241         if (device_may_wakeup(dev)) {
 242                 if (palmas_usb->enable_vbus_detection)
 243                         enable_irq_wake(palmas_usb->vbus_irq);
 244                 if (palmas_usb->enable_id_detection)
 245                         enable_irq_wake(palmas_usb->id_irq);
 246         }
 247         return 0;
 248 }
 249
 250 static int palmas_usb_resume(struct device *dev)
 251 {
 252         struct palmas_usb *palmas_usb = dev_get_drvdata(dev);
 253
 254         if (device_may_wakeup(dev)) {
 255                 if (palmas_usb->enable_vbus_detection)
 256                         disable_irq_wake(palmas_usb->vbus_irq);
 257                 if (palmas_usb->enable_id_detection)
 258                         disable_irq_wake(palmas_usb->id_irq);
 259         }
 260         return 0;
 261 };
 262 #endif
 263
 264 static const struct dev_pm_ops palmas_pm_ops = {
 265         SET_SYSTEM_SLEEP_PM_OPS(palmas_usb_suspend,
 266                                 palmas_usb_resume)
 267 };
 268
 269 static struct of_device_id of_palmas_match_tbl[] = {
 270         { .compatible = "ti,palmas-usb", },
 271         { .compatible = "ti,twl6035-usb", },
 272         { /* end */ }
 273 };
 274
 275 static struct platform_driver palmas_usb_driver = {
 276         .probe = palmas_usb_probe,
 277         .remove = palmas_usb_remove,
 278         .driver = {
 279                 .name = "palmas-usb",
 280                 .of_match_table = of_palmas_match_tbl,
 281                 .owner = THIS_MODULE,
 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);