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, id_src;
  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         palmas_read(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
  87                 PALMAS_USB_ID_INT_SRC, &id_src);
  88
  89         if ((set & PALMAS_USB_ID_INT_SRC_ID_GND) &&
  90                                 (id_src & PALMAS_USB_ID_INT_SRC_ID_GND)) {
  91                 palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
  92                         PALMAS_USB_ID_INT_LATCH_CLR,
  93                         PALMAS_USB_ID_INT_EN_HI_CLR_ID_GND);
  94                 palmas_usb->linkstat = PALMAS_USB_STATE_ID;
  95                 extcon_set_cable_state(&palmas_usb->edev, "USB-HOST", true);
  96                 dev_info(palmas_usb->dev, "USB-HOST cable is attached\n");
  97         } else if ((set & PALMAS_USB_ID_INT_SRC_ID_FLOAT) &&
  98                                 (id_src & PALMAS_USB_ID_INT_SRC_ID_FLOAT)) {
  99                 palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
 100                         PALMAS_USB_ID_INT_LATCH_CLR,
 101                         PALMAS_USB_ID_INT_EN_HI_CLR_ID_FLOAT);
 102                 palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
 103                 extcon_set_cable_state(&palmas_usb->edev, "USB-HOST", false);
 104                 dev_info(palmas_usb->dev, "USB-HOST cable is detached\n");
 105         } else if ((palmas_usb->linkstat == PALMAS_USB_STATE_ID) &&
 106                                 (!(set & PALMAS_USB_ID_INT_SRC_ID_GND))) {
 107                 palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
 108                 extcon_set_cable_state(&palmas_usb->edev, "USB-HOST", false);
 109                 dev_info(palmas_usb->dev, "USB-HOST cable is detached\n");
 110         } else if ((palmas_usb->linkstat == PALMAS_USB_STATE_DISCONNECT) &&
 111                                 (id_src & PALMAS_USB_ID_INT_SRC_ID_GND)) {
 112                 palmas_usb->linkstat = PALMAS_USB_STATE_ID;
 113                 extcon_set_cable_state(&palmas_usb->edev, "USB-HOST", true);
 114                 dev_info(palmas_usb->dev, " USB-HOST cable is attached\n");
 115         }
 116
 117         return IRQ_HANDLED;
 118 }
 119
 120 static void palmas_enable_irq(struct palmas_usb *palmas_usb)
 121 {
 122         palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
 123                 PALMAS_USB_VBUS_CTRL_SET,
 124                 PALMAS_USB_VBUS_CTRL_SET_VBUS_ACT_COMP);
 125
 126         palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
 127                 PALMAS_USB_ID_CTRL_SET, PALMAS_USB_ID_CTRL_SET_ID_ACT_COMP);
 128
 129         palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
 130                 PALMAS_USB_ID_INT_EN_HI_SET,
 131                 PALMAS_USB_ID_INT_EN_HI_SET_ID_GND |
 132                 PALMAS_USB_ID_INT_EN_HI_SET_ID_FLOAT);
 133
 134         if (palmas_usb->enable_vbus_detection)
 135                 palmas_vbus_irq_handler(palmas_usb->vbus_irq, palmas_usb);
 136
 137         /* cold plug for host mode needs this delay */
 138         if (palmas_usb->enable_id_detection) {
 139                 msleep(30);
 140                 palmas_id_irq_handler(palmas_usb->id_irq, palmas_usb);
 141         }
 142 }
 143
 144 static int palmas_usb_probe(struct platform_device *pdev)
 145 {
 146         struct palmas *palmas = dev_get_drvdata(pdev->dev.parent);
 147         struct palmas_usb_platform_data *pdata = dev_get_platdata(&pdev->dev);
 148         struct device_node *node = pdev->dev.of_node;
 149         struct palmas_usb *palmas_usb;
 150         int status;
 151
 152         palmas_usb = devm_kzalloc(&pdev->dev, sizeof(*palmas_usb), GFP_KERNEL);
 153         if (!palmas_usb)
 154                 return -ENOMEM;
 155
 156         if (node && !pdata) {
 157                 palmas_usb->wakeup = of_property_read_bool(node, "ti,wakeup");
 158                 palmas_usb->enable_id_detection = of_property_read_bool(node,
 159                                                 "ti,enable-id-detection");
 160                 palmas_usb->enable_vbus_detection = of_property_read_bool(node,
 161                                                 "ti,enable-vbus-detection");
 162         } else {
 163                 palmas_usb->wakeup = true;
 164                 palmas_usb->enable_id_detection = true;
 165                 palmas_usb->enable_vbus_detection = true;
 166
 167                 if (pdata)
 168                         palmas_usb->wakeup = pdata->wakeup;
 169         }
 170
 171         palmas->usb = palmas_usb;
 172         palmas_usb->palmas = palmas;
 173
 174         palmas_usb->dev  = &pdev->dev;
 175
 176         palmas_usb->id_otg_irq = regmap_irq_get_virq(palmas->irq_data,
 177                                                 PALMAS_ID_OTG_IRQ);
 178         palmas_usb->id_irq = regmap_irq_get_virq(palmas->irq_data,
 179                                                 PALMAS_ID_IRQ);
 180         palmas_usb->vbus_otg_irq = regmap_irq_get_virq(palmas->irq_data,
 181                                                 PALMAS_VBUS_OTG_IRQ);
 182         palmas_usb->vbus_irq = regmap_irq_get_virq(palmas->irq_data,
 183                                                 PALMAS_VBUS_IRQ);
 184
 185         palmas_usb_wakeup(palmas, palmas_usb->wakeup);
 186
 187         platform_set_drvdata(pdev, palmas_usb);
 188
 189         palmas_usb->edev.supported_cable = palmas_extcon_cable;
 190         palmas_usb->edev.dev.parent = palmas_usb->dev;
 191         palmas_usb->edev.mutually_exclusive = mutually_exclusive;
 192
 193         status = extcon_dev_register(&palmas_usb->edev);
 194         if (status) {
 195                 dev_err(&pdev->dev, "failed to register extcon device\n");
 196                 return status;
 197         }
 198
 199         if (palmas_usb->enable_id_detection) {
 200                 status = devm_request_threaded_irq(palmas_usb->dev,
 201                                 palmas_usb->id_irq,
 202                                 NULL, palmas_id_irq_handler,
 203                                 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING |
 204                                 IRQF_ONESHOT | IRQF_EARLY_RESUME,
 205                                 "palmas_usb_id", palmas_usb);
 206                 if (status < 0) {
 207                         dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
 208                                         palmas_usb->id_irq, status);
 209                         goto fail_extcon;
 210                 }
 211         }
 212
 213         if (palmas_usb->enable_vbus_detection) {
 214                 status = devm_request_threaded_irq(palmas_usb->dev,
 215                                 palmas_usb->vbus_irq, NULL,
 216                                 palmas_vbus_irq_handler,
 217                                 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING |
 218                                 IRQF_ONESHOT | IRQF_EARLY_RESUME,
 219                                 "palmas_usb_vbus", palmas_usb);
 220                 if (status < 0) {
 221                         dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
 222                                         palmas_usb->vbus_irq, status);
 223                         goto fail_extcon;
 224                 }
 225         }
 226
 227         palmas_enable_irq(palmas_usb);
 228         device_set_wakeup_capable(&pdev->dev, true);
 229         return 0;
 230
 231 fail_extcon:
 232         extcon_dev_unregister(&palmas_usb->edev);
 233
 234         return status;
 235 }
 236
 237 static int palmas_usb_remove(struct platform_device *pdev)
 238 {
 239         struct palmas_usb *palmas_usb = platform_get_drvdata(pdev);
 240
 241         extcon_dev_unregister(&palmas_usb->edev);
 242
 243         return 0;
 244 }
 245
 246 #ifdef CONFIG_PM_SLEEP
 247 static int palmas_usb_suspend(struct device *dev)
 248 {
 249         struct palmas_usb *palmas_usb = dev_get_drvdata(dev);
 250
 251         if (device_may_wakeup(dev)) {
 252                 if (palmas_usb->enable_vbus_detection)
 253                         enable_irq_wake(palmas_usb->vbus_irq);
 254                 if (palmas_usb->enable_id_detection)
 255                         enable_irq_wake(palmas_usb->id_irq);
 256         }
 257         return 0;
 258 }
 259
 260 static int palmas_usb_resume(struct device *dev)
 261 {
 262         struct palmas_usb *palmas_usb = dev_get_drvdata(dev);
 263
 264         if (device_may_wakeup(dev)) {
 265                 if (palmas_usb->enable_vbus_detection)
 266                         disable_irq_wake(palmas_usb->vbus_irq);
 267                 if (palmas_usb->enable_id_detection)
 268                         disable_irq_wake(palmas_usb->id_irq);
 269         }
 270         return 0;
 271 };
 272 #endif
 273
 274 static const struct dev_pm_ops palmas_pm_ops = {
 275         SET_SYSTEM_SLEEP_PM_OPS(palmas_usb_suspend,
 276                                 palmas_usb_resume)
 277 };
 278
 279 static struct of_device_id of_palmas_match_tbl[] = {
 280         { .compatible = "ti,palmas-usb", },
 281         { .compatible = "ti,palmas-usb-vid", },
 282         { .compatible = "ti,twl6035-usb", },
 283         { .compatible = "ti,twl6035-usb-vid", },
 284         { /* end */ }
 285 };
 286
 287 static struct platform_driver palmas_usb_driver = {
 288         .probe = palmas_usb_probe,
 289         .remove = palmas_usb_remove,
 290         .driver = {
 291                 .name = "palmas-usb",
 292                 .of_match_table = of_palmas_match_tbl,
 293                 .owner = THIS_MODULE,
 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);