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                 } else {
  61                         dev_dbg(palmas_usb->dev,
  62                                 "Spurious connect event detected\n");
  63                 }
  64         } else if (!(vbus_line_state & PALMAS_INT3_LINE_STATE_VBUS)) {
  65                 if (palmas_usb->linkstat == PALMAS_USB_STATE_VBUS) {
  66                         palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
  67                         extcon_set_cable_state(&palmas_usb->edev, "USB", false);
  68                 } else {
  69                         dev_dbg(palmas_usb->dev,
  70                                 "Spurious disconnect event detected\n");
  71                 }
  72         }
  73
  74         return IRQ_HANDLED;
  75 }
  76
  77 static irqreturn_t palmas_id_irq_handler(int irq, void *_palmas_usb)
  78 {
  79         unsigned int set;
  80         struct palmas_usb *palmas_usb = _palmas_usb;
  81
  82         palmas_read(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
  83                 PALMAS_USB_ID_INT_LATCH_SET, &set);
  84
  85         if (set & PALMAS_USB_ID_INT_SRC_ID_GND) {
  86                 palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
  87                         PALMAS_USB_ID_INT_EN_HI_SET,
  88                         PALMAS_USB_ID_INT_EN_HI_SET_ID_FLOAT);
  89                 palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
  90                         PALMAS_USB_ID_INT_EN_HI_CLR,
  91                         PALMAS_USB_ID_INT_EN_HI_CLR_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         } else if (set & PALMAS_USB_ID_INT_SRC_ID_FLOAT) {
  98                 palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
  99                         PALMAS_USB_ID_INT_EN_HI_SET,
 100                         PALMAS_USB_ID_INT_EN_HI_SET_ID_GND);
 101                 palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
 102                         PALMAS_USB_ID_INT_EN_HI_CLR,
 103                         PALMAS_USB_ID_INT_EN_HI_CLR_ID_FLOAT);
 104                 palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
 105                         PALMAS_USB_ID_INT_LATCH_CLR,
 106                         PALMAS_USB_ID_INT_EN_HI_CLR_ID_FLOAT);
 107                 palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
 108                 extcon_set_cable_state(&palmas_usb->edev, "USB-HOST", false);
 109         }
 110
 111         return IRQ_HANDLED;
 112 }
 113
 114 static void palmas_enable_irq(struct palmas_usb *palmas_usb)
 115 {
 116         palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
 117                 PALMAS_USB_VBUS_CTRL_SET,
 118                 PALMAS_USB_VBUS_CTRL_SET_VBUS_ACT_COMP);
 119
 120         palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
 121                 PALMAS_USB_ID_CTRL_SET, PALMAS_USB_ID_CTRL_SET_ID_ACT_COMP);
 122
 123         palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
 124                 PALMAS_USB_ID_INT_EN_HI_SET,
 125                 PALMAS_USB_ID_INT_EN_HI_SET_ID_GND);
 126
 127         palmas_vbus_irq_handler(palmas_usb->vbus_irq, palmas_usb);
 128
 129         /* cold plug for host mode needs this delay */
 130         msleep(30);
 131         palmas_id_irq_handler(palmas_usb->id_irq, palmas_usb);
 132 }
 133
 134 static int palmas_usb_probe(struct platform_device *pdev)
 135 {
 136         struct palmas *palmas = dev_get_drvdata(pdev->dev.parent);
 137         struct palmas_usb_platform_data *pdata = pdev->dev.platform_data;
 138         struct device_node *node = pdev->dev.of_node;
 139         struct palmas_usb *palmas_usb;
 140         int status;
 141
 142         if (node && !pdata) {
 143                 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
 144
 145                 if (!pdata)
 146                         return -ENOMEM;
 147
 148                 pdata->wakeup = of_property_read_bool(node, "ti,wakeup");
 149         } else if (!pdata) {
 150                 return -EINVAL;
 151         }
 152
 153         palmas_usb = devm_kzalloc(&pdev->dev, sizeof(*palmas_usb), GFP_KERNEL);
 154         if (!palmas_usb)
 155                 return -ENOMEM;
 156
 157         palmas->usb = palmas_usb;
 158         palmas_usb->palmas = palmas;
 159
 160         palmas_usb->dev  = &pdev->dev;
 161
 162         palmas_usb->id_otg_irq = regmap_irq_get_virq(palmas->irq_data,
 163                                                 PALMAS_ID_OTG_IRQ);
 164         palmas_usb->id_irq = regmap_irq_get_virq(palmas->irq_data,
 165                                                 PALMAS_ID_IRQ);
 166         palmas_usb->vbus_otg_irq = regmap_irq_get_virq(palmas->irq_data,
 167                                                 PALMAS_VBUS_OTG_IRQ);
 168         palmas_usb->vbus_irq = regmap_irq_get_virq(palmas->irq_data,
 169                                                 PALMAS_VBUS_IRQ);
 170
 171         palmas_usb_wakeup(palmas, pdata->wakeup);
 172
 173         platform_set_drvdata(pdev, palmas_usb);
 174
 175         palmas_usb->edev.name = "palmas-usb";
 176         palmas_usb->edev.supported_cable = palmas_extcon_cable;
 177         palmas_usb->edev.mutually_exclusive = mutually_exclusive;
 178
 179         status = extcon_dev_register(&palmas_usb->edev, palmas_usb->dev);
 180         if (status) {
 181                 dev_err(&pdev->dev, "failed to register extcon device\n");
 182                 return status;
 183         }
 184
 185         status = devm_request_threaded_irq(palmas_usb->dev, palmas_usb->id_irq,
 186                         NULL, palmas_id_irq_handler,
 187                         IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
 188                         "palmas_usb_id", palmas_usb);
 189         if (status < 0) {
 190                 dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
 191                                         palmas_usb->id_irq, status);
 192                 goto fail_extcon;
 193         }
 194
 195         status = devm_request_threaded_irq(palmas_usb->dev,
 196                         palmas_usb->vbus_irq, NULL, palmas_vbus_irq_handler,
 197                         IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
 198                         "palmas_usb_vbus", palmas_usb);
 199         if (status < 0) {
 200                 dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
 201                                         palmas_usb->vbus_irq, status);
 202                 goto fail_extcon;
 203         }
 204
 205         palmas_enable_irq(palmas_usb);
 206
 207         return 0;
 208
 209 fail_extcon:
 210         extcon_dev_unregister(&palmas_usb->edev);
 211
 212         return status;
 213 }
 214
 215 static int palmas_usb_remove(struct platform_device *pdev)
 216 {
 217         struct palmas_usb *palmas_usb = platform_get_drvdata(pdev);
 218
 219         extcon_dev_unregister(&palmas_usb->edev);
 220
 221         return 0;
 222 }
 223
 224 static struct of_device_id of_palmas_match_tbl[] = {
 225         { .compatible = "ti,palmas-usb", },
 226         { .compatible = "ti,twl6035-usb", },
 227         { /* end */ }
 228 };
 229
 230 static struct platform_driver palmas_usb_driver = {
 231         .probe = palmas_usb_probe,
 232         .remove = palmas_usb_remove,
 233         .driver = {
 234                 .name = "palmas-usb",
 235                 .of_match_table = of_palmas_match_tbl,
 236                 .owner = THIS_MODULE,
 237         },
 238 };
 239
 240 module_platform_driver(palmas_usb_driver);
 241
 242 MODULE_ALIAS("platform:palmas-usb");
 243 MODULE_AUTHOR("Graeme Gregory <gg@slimlogic.co.uk>");
 244 MODULE_DESCRIPTION("Palmas USB transceiver driver");
 245 MODULE_LICENSE("GPL");
 246 MODULE_DEVICE_TABLE(of, of_palmas_match_tbl);