drivers/usb/storage/onetouch.c

   1 /*
   2  * Support for the Maxtor OneTouch USB hard drive's button
   3  *
   4  * Current development and maintenance by:
   5  *      Copyright (c) 2005 Nick Sillik <n.sillik@temple.edu>
   6  *
   7  * Initial work by:
   8  *      Copyright (c) 2003 Erik Thyren <erth7411@student.uu.se>
   9  *
  10  * Based on usbmouse.c (Vojtech Pavlik) and xpad.c (Marko Friedemann)
  11  *
  12  */
  13
  14 /*
  15  * This program is free software; you can redistribute it and/or modify
  16  * it under the terms of the GNU General Public License as published by
  17  * the Free Software Foundation; either version 2 of the License, or
  18  * (at your option) any later version.
  19  *
  20  * This program is distributed in the hope that it will be useful,
  21  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  22  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23  * GNU General Public License for more details.
  24  *
  25  * You should have received a copy of the GNU General Public License
  26  * along with this program; if not, write to the Free Software
  27  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  28  *
  29  */
  30
  31 #include <linux/kernel.h>
  32 #include <linux/input.h>
  33 #include <linux/init.h>
  34 #include <linux/slab.h>
  35 #include <linux/module.h>
  36 #include <linux/usb/input.h>
  37 #include "usb.h"
  38 #include "onetouch.h"
  39 #include "debug.h"
  40
  41 static void onetouch_release_input(void *onetouch_);
  42
  43 struct usb_onetouch {
  44         char name[128];
  45         char phys[64];
  46         struct input_dev *dev;  /* input device interface */
  47         struct usb_device *udev;        /* usb device */
  48
  49         struct urb *irq;        /* urb for interrupt in report */
  50         unsigned char *data;    /* input data */
  51         dma_addr_t data_dma;
  52         unsigned int is_open:1;
  53 };
  54
  55 static void usb_onetouch_irq(struct urb *urb)
  56 {
  57         struct usb_onetouch *onetouch = urb->context;
  58         signed char *data = onetouch->data;
  59         struct input_dev *dev = onetouch->dev;
  60         int status = urb->status;
  61         int retval;
  62
  63         switch (status) {
  64         case 0:                 /* success */
  65                 break;
  66         case -ECONNRESET:       /* unlink */
  67         case -ENOENT:
  68         case -ESHUTDOWN:
  69                 return;
  70         /* -EPIPE:  should clear the halt */
  71         default:                /* error */
  72                 goto resubmit;
  73         }
  74
  75         input_report_key(dev, ONETOUCH_BUTTON, data[0] & 0x02);
  76         input_sync(dev);
  77
  78 resubmit:
  79         retval = usb_submit_urb (urb, GFP_ATOMIC);
  80         if (retval)
  81                 err ("can't resubmit intr, %s-%s/input0, retval %d",
  82                         onetouch->udev->bus->bus_name,
  83                         onetouch->udev->devpath, retval);
  84 }
  85
  86 static int usb_onetouch_open(struct input_dev *dev)
  87 {
  88         struct usb_onetouch *onetouch = input_get_drvdata(dev);
  89
  90         onetouch->is_open = 1;
  91         onetouch->irq->dev = onetouch->udev;
  92         if (usb_submit_urb(onetouch->irq, GFP_KERNEL)) {
  93                 err("usb_submit_urb failed");
  94                 return -EIO;
  95         }
  96
  97         return 0;
  98 }
  99
 100 static void usb_onetouch_close(struct input_dev *dev)
 101 {
 102         struct usb_onetouch *onetouch = input_get_drvdata(dev);
 103
 104         usb_kill_urb(onetouch->irq);
 105         onetouch->is_open = 0;
 106 }
 107
 108 #ifdef CONFIG_PM
 109 static void usb_onetouch_pm_hook(struct us_data *us, int action)
 110 {
 111         struct usb_onetouch *onetouch = (struct usb_onetouch *) us->extra;
 112
 113         if (onetouch->is_open) {
 114                 switch (action) {
 115                 case US_SUSPEND:
 116                         usb_kill_urb(onetouch->irq);
 117                         break;
 118                 case US_RESUME:
 119                         if (usb_submit_urb(onetouch->irq, GFP_KERNEL) != 0)
 120                                 err("usb_submit_urb failed");
 121                         break;
 122                 default:
 123                         break;
 124                 }
 125         }
 126 }
 127 #endif /* CONFIG_PM */
 128
 129 int onetouch_connect_input(struct us_data *ss)
 130 {
 131         struct usb_device *udev = ss->pusb_dev;
 132         struct usb_host_interface *interface;
 133         struct usb_endpoint_descriptor *endpoint;
 134         struct usb_onetouch *onetouch;
 135         struct input_dev *input_dev;
 136         int pipe, maxp;
 137         int error = -ENOMEM;
 138
 139         interface = ss->pusb_intf->cur_altsetting;
 140
 141         if (interface->desc.bNumEndpoints != 3)
 142                 return -ENODEV;
 143
 144         endpoint = &interface->endpoint[2].desc;
 145         if (!usb_endpoint_is_int_in(endpoint))
 146                 return -ENODEV;
 147
 148         pipe = usb_rcvintpipe(udev, endpoint->bEndpointAddress);
 149         maxp = usb_maxpacket(udev, pipe, usb_pipeout(pipe));
 150
 151         onetouch = kzalloc(sizeof(struct usb_onetouch), GFP_KERNEL);
 152         input_dev = input_allocate_device();
 153         if (!onetouch || !input_dev)
 154                 goto fail1;
 155
 156         onetouch->data = usb_buffer_alloc(udev, ONETOUCH_PKT_LEN,
 157                                           GFP_ATOMIC, &onetouch->data_dma);
 158         if (!onetouch->data)
 159                 goto fail1;
 160
 161         onetouch->irq = usb_alloc_urb(0, GFP_KERNEL);
 162         if (!onetouch->irq)
 163                 goto fail2;
 164
 165         onetouch->udev = udev;
 166         onetouch->dev = input_dev;
 167
 168         if (udev->manufacturer)
 169                 strlcpy(onetouch->name, udev->manufacturer,
 170                         sizeof(onetouch->name));
 171         if (udev->product) {
 172                 if (udev->manufacturer)
 173                         strlcat(onetouch->name, " ", sizeof(onetouch->name));
 174                 strlcat(onetouch->name, udev->product, sizeof(onetouch->name));
 175         }
 176
 177         if (!strlen(onetouch->name))
 178                 snprintf(onetouch->name, sizeof(onetouch->name),
 179                          "Maxtor Onetouch %04x:%04x",
 180                          le16_to_cpu(udev->descriptor.idVendor),
 181                          le16_to_cpu(udev->descriptor.idProduct));
 182
 183         usb_make_path(udev, onetouch->phys, sizeof(onetouch->phys));
 184         strlcat(onetouch->phys, "/input0", sizeof(onetouch->phys));
 185
 186         input_dev->name = onetouch->name;
 187         input_dev->phys = onetouch->phys;
 188         usb_to_input_id(udev, &input_dev->id);
 189         input_dev->dev.parent = &udev->dev;
 190
 191         set_bit(EV_KEY, input_dev->evbit);
 192         set_bit(ONETOUCH_BUTTON, input_dev->keybit);
 193         clear_bit(0, input_dev->keybit);
 194
 195         input_set_drvdata(input_dev, onetouch);
 196
 197         input_dev->open = usb_onetouch_open;
 198         input_dev->close = usb_onetouch_close;
 199
 200         usb_fill_int_urb(onetouch->irq, udev, pipe, onetouch->data,
 201                          (maxp > 8 ? 8 : maxp),
 202                          usb_onetouch_irq, onetouch, endpoint->bInterval);
 203         onetouch->irq->transfer_dma = onetouch->data_dma;
 204         onetouch->irq->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 205
 206         ss->extra_destructor = onetouch_release_input;
 207         ss->extra = onetouch;
 208 #ifdef CONFIG_PM
 209         ss->suspend_resume_hook = usb_onetouch_pm_hook;
 210 #endif
 211
 212         error = input_register_device(onetouch->dev);
 213         if (error)
 214                 goto fail3;
 215
 216         return 0;
 217
 218  fail3: usb_free_urb(onetouch->irq);
 219  fail2: usb_buffer_free(udev, ONETOUCH_PKT_LEN,
 220                         onetouch->data, onetouch->data_dma);
 221  fail1: kfree(onetouch);
 222         input_free_device(input_dev);
 223         return error;
 224 }
 225
 226 static void onetouch_release_input(void *onetouch_)
 227 {
 228         struct usb_onetouch *onetouch = (struct usb_onetouch *) onetouch_;
 229
 230         if (onetouch) {
 231                 usb_kill_urb(onetouch->irq);
 232                 input_unregister_device(onetouch->dev);
 233                 usb_free_urb(onetouch->irq);
 234                 usb_buffer_free(onetouch->udev, ONETOUCH_PKT_LEN,
 235                                 onetouch->data, onetouch->data_dma);
 236         }
 237 }