linux/drivers/extcon/extcon-palmas.c
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   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
  32static const char *palmas_extcon_cable[] = {
  33        [0] = "USB",
  34        [1] = "USB-HOST",
  35        NULL,
  36};
  37
  38static const int mutually_exclusive[] = {0x3, 0x0};
  39
  40static 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
  49static 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
  80static 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
 121static 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
 145static 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
 241static 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
 251static 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
 264static 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
 278static SIMPLE_DEV_PM_OPS(palmas_pm_ops, palmas_usb_suspend, palmas_usb_resume);
 279
 280static 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
 288static 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
 298module_platform_driver(palmas_usb_driver);
 299
 300MODULE_ALIAS("platform:palmas-usb");
 301MODULE_AUTHOR("Graeme Gregory <gg@slimlogic.co.uk>");
 302MODULE_DESCRIPTION("Palmas USB transceiver driver");
 303MODULE_LICENSE("GPL");
 304MODULE_DEVICE_TABLE(of, of_palmas_match_tbl);
 305
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