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 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;
  61
  62         switch (urb->status) {
  63         case 0:                 /* success */
  64                 break;
  65         case -ECONNRESET:       /* unlink */
  66         case -ENOENT:
  67         case -ESHUTDOWN:
  68                 return;
  69         /* -EPIPE:  should clear the halt */
  70         default:                /* error */
  71                 goto resubmit;
  72         }
  73
  74         input_report_key(dev, ONETOUCH_BUTTON, data[0] & 0x02);
  75         input_sync(dev);
  76
  77 resubmit:
  78         status = usb_submit_urb (urb, GFP_ATOMIC);
  79         if (status)
  80                 err ("can't resubmit intr, %s-%s/input0, status %d",
  81                         onetouch->udev->bus->bus_name,
  82                         onetouch->udev->devpath, status);
  83 }
  84
  85 static int usb_onetouch_open(struct input_dev *dev)
  86 {
  87         struct usb_onetouch *onetouch = dev->private;
  88
  89         onetouch->is_open = 1;
  90         onetouch->irq->dev = onetouch->udev;
  91         if (usb_submit_urb(onetouch->irq, GFP_KERNEL)) {
  92                 err("usb_submit_urb failed");
  93                 return -EIO;
  94         }
  95
  96         return 0;
  97 }
  98
  99 static void usb_onetouch_close(struct input_dev *dev)
 100 {
 101         struct usb_onetouch *onetouch = dev->private;
 102
 103         usb_kill_urb(onetouch->irq);
 104         onetouch->is_open = 0;
 105 }
 106
 107 #ifdef CONFIG_PM
 108 static void usb_onetouch_pm_hook(struct us_data *us, int action)
 109 {
 110         struct usb_onetouch *onetouch = (struct usb_onetouch *) us->extra;
 111
 112         if (onetouch->is_open) {
 113                 switch (action) {
 114                 case US_SUSPEND:
 115                         usb_kill_urb(onetouch->irq);
 116                         break;
 117                 case US_RESUME:
 118                         if (usb_submit_urb(onetouch->irq, GFP_KERNEL) != 0)
 119                                 err("usb_submit_urb failed");
 120                         break;
 121                 default:
 122                         break;
 123                 }
 124         }
 125 }
 126 #endif /* CONFIG_PM */
 127
 128 int onetouch_connect_input(struct us_data *ss)
 129 {
 130         struct usb_device *udev = ss->pusb_dev;
 131         struct usb_host_interface *interface;
 132         struct usb_endpoint_descriptor *endpoint;
 133         struct usb_onetouch *onetouch;
 134         struct input_dev *input_dev;
 135         int pipe, maxp;
 136         int error = -ENOMEM;
 137
 138         interface = ss->pusb_intf->cur_altsetting;
 139
 140         if (interface->desc.bNumEndpoints != 3)
 141                 return -ENODEV;
 142
 143         endpoint = &interface->endpoint[2].desc;
 144         if (!usb_endpoint_is_int_in(endpoint))
 145                 return -ENODEV;
 146
 147         pipe = usb_rcvintpipe(udev, endpoint->bEndpointAddress);
 148         maxp = usb_maxpacket(udev, pipe, usb_pipeout(pipe));
 149
 150         onetouch = kzalloc(sizeof(struct usb_onetouch), GFP_KERNEL);
 151         input_dev = input_allocate_device();
 152         if (!onetouch || !input_dev)
 153                 goto fail1;
 154
 155         onetouch->data = usb_buffer_alloc(udev, ONETOUCH_PKT_LEN,
 156                                           GFP_ATOMIC, &onetouch->data_dma);
 157         if (!onetouch->data)
 158                 goto fail1;
 159
 160         onetouch->irq = usb_alloc_urb(0, GFP_KERNEL);
 161         if (!onetouch->irq)
 162                 goto fail2;
 163
 164         onetouch->udev = udev;
 165         onetouch->dev = input_dev;
 166
 167         if (udev->manufacturer)
 168                 strlcpy(onetouch->name, udev->manufacturer,
 169                         sizeof(onetouch->name));
 170         if (udev->product) {
 171                 if (udev->manufacturer)
 172                         strlcat(onetouch->name, " ", sizeof(onetouch->name));
 173                 strlcat(onetouch->name, udev->product, sizeof(onetouch->name));
 174         }
 175
 176         if (!strlen(onetouch->name))
 177                 snprintf(onetouch->name, sizeof(onetouch->name),
 178                          "Maxtor Onetouch %04x:%04x",
 179                          le16_to_cpu(udev->descriptor.idVendor),
 180                          le16_to_cpu(udev->descriptor.idProduct));
 181
 182         usb_make_path(udev, onetouch->phys, sizeof(onetouch->phys));
 183         strlcat(onetouch->phys, "/input0", sizeof(onetouch->phys));
 184
 185         input_dev->name = onetouch->name;
 186         input_dev->phys = onetouch->phys;
 187         usb_to_input_id(udev, &input_dev->id);
 188         input_dev->cdev.dev = &udev->dev;
 189
 190         set_bit(EV_KEY, input_dev->evbit);
 191         set_bit(ONETOUCH_BUTTON, input_dev->keybit);
 192         clear_bit(0, input_dev->keybit);
 193
 194         input_dev->private = onetouch;
 195         input_dev->open = usb_onetouch_open;
 196         input_dev->close = usb_onetouch_close;
 197
 198         usb_fill_int_urb(onetouch->irq, udev, pipe, onetouch->data,
 199                          (maxp > 8 ? 8 : maxp),
 200                          usb_onetouch_irq, onetouch, endpoint->bInterval);
 201         onetouch->irq->transfer_dma = onetouch->data_dma;
 202         onetouch->irq->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 203
 204         ss->extra_destructor = onetouch_release_input;
 205         ss->extra = onetouch;
 206 #ifdef CONFIG_PM
 207         ss->suspend_resume_hook = usb_onetouch_pm_hook;
 208 #endif
 209
 210         error = input_register_device(onetouch->dev);
 211         if (error)
 212                 goto fail3;
 213
 214         return 0;
 215
 216  fail3: usb_free_urb(onetouch->irq);
 217  fail2: usb_buffer_free(udev, ONETOUCH_PKT_LEN,
 218                         onetouch->data, onetouch->data_dma);
 219  fail1: kfree(onetouch);
 220         input_free_device(input_dev);
 221         return error;
 222 }
 223
 224 void onetouch_release_input(void *onetouch_)
 225 {
 226         struct usb_onetouch *onetouch = (struct usb_onetouch *) onetouch_;
 227
 228         if (onetouch) {
 229                 usb_kill_urb(onetouch->irq);
 230                 input_unregister_device(onetouch->dev);
 231                 usb_free_urb(onetouch->irq);
 232                 usb_buffer_free(onetouch->udev, ONETOUCH_PKT_LEN,
 233                                 onetouch->data, onetouch->data_dma);
 234         }
 235 }