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/config.h>
  32 #include <linux/kernel.h>
  33 #include <linux/input.h>
  34 #include <linux/init.h>
  35 #include <linux/slab.h>
  36 #include <linux/module.h>
  37 #include <linux/usb.h>
  38 #include <linux/usb_ch9.h>
  39 #include <linux/usb_input.h>
  40 #include "usb.h"
  41 #include "onetouch.h"
  42 #include "debug.h"
  43
  44 void onetouch_release_input(void *onetouch_);
  45
  46 struct usb_onetouch {
  47         char name[128];
  48         char phys[64];
  49         struct input_dev dev;   /* input device interface */
  50         struct usb_device *udev;        /* usb device */
  51
  52         struct urb *irq;        /* urb for interrupt in report */
  53         unsigned char *data;    /* input data */
  54         dma_addr_t data_dma;
  55 };
  56
  57 static void usb_onetouch_irq(struct urb *urb, struct pt_regs *regs)
  58 {
  59         struct usb_onetouch *onetouch = urb->context;
  60         signed char *data = onetouch->data;
  61         struct input_dev *dev = &onetouch->dev;
  62         int status;
  63
  64         switch (urb->status) {
  65         case 0:                 /* success */
  66                 break;
  67         case -ECONNRESET:       /* unlink */
  68         case -ENOENT:
  69         case -ESHUTDOWN:
  70                 return;
  71         /* -EPIPE:  should clear the halt */
  72         default:                /* error */
  73                 goto resubmit;
  74         }
  75
  76         input_regs(dev, regs);
  77
  78         input_report_key(&onetouch->dev, ONETOUCH_BUTTON,
  79                          data[0] & 0x02);
  80
  81         input_sync(dev);
  82 resubmit:
  83         status = usb_submit_urb (urb, SLAB_ATOMIC);
  84         if (status)
  85                 err ("can't resubmit intr, %s-%s/input0, status %d",
  86                         onetouch->udev->bus->bus_name,
  87                         onetouch->udev->devpath, status);
  88 }
  89
  90 static int usb_onetouch_open(struct input_dev *dev)
  91 {
  92         struct usb_onetouch *onetouch = dev->private;
  93
  94         onetouch->irq->dev = onetouch->udev;
  95         if (usb_submit_urb(onetouch->irq, GFP_KERNEL)) {
  96                 err("usb_submit_urb failed");
  97                 return -EIO;
  98         }
  99
 100         return 0;
 101 }
 102
 103 static void usb_onetouch_close(struct input_dev *dev)
 104 {
 105         struct usb_onetouch *onetouch = dev->private;
 106
 107         usb_kill_urb(onetouch->irq);
 108 }
 109
 110 int onetouch_connect_input(struct us_data *ss)
 111 {
 112         struct usb_device *udev = ss->pusb_dev;
 113         struct usb_host_interface *interface;
 114         struct usb_endpoint_descriptor *endpoint;
 115         struct usb_onetouch *onetouch;
 116         int pipe, maxp;
 117         char path[64];
 118
 119         interface = ss->pusb_intf->cur_altsetting;
 120
 121         if (interface->desc.bNumEndpoints != 3)
 122                 return -ENODEV;
 123
 124         endpoint = &interface->endpoint[2].desc;
 125         if(!(endpoint->bEndpointAddress & USB_DIR_IN))
 126                 return -ENODEV;
 127         if((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
 128                         != USB_ENDPOINT_XFER_INT)
 129                 return -ENODEV;
 130
 131         pipe = usb_rcvintpipe(udev, endpoint->bEndpointAddress);
 132         maxp = usb_maxpacket(udev, pipe, usb_pipeout(pipe));
 133
 134         if (!(onetouch = kcalloc(1, sizeof(struct usb_onetouch), GFP_KERNEL)))
 135                 return -ENOMEM;
 136
 137         onetouch->data = usb_buffer_alloc(udev, ONETOUCH_PKT_LEN,
 138                                           SLAB_ATOMIC, &onetouch->data_dma);
 139         if (!onetouch->data){
 140                 kfree(onetouch);
 141                 return -ENOMEM;
 142         }
 143
 144         onetouch->irq = usb_alloc_urb(0, GFP_KERNEL);
 145         if (!onetouch->irq){
 146                 kfree(onetouch);
 147                 usb_buffer_free(udev, ONETOUCH_PKT_LEN,
 148                                 onetouch->data, onetouch->data_dma);
 149                 return -ENODEV;
 150         }
 151
 152
 153         onetouch->udev = udev;
 154
 155         set_bit(EV_KEY, onetouch->dev.evbit);
 156         set_bit(ONETOUCH_BUTTON, onetouch->dev.keybit);
 157         clear_bit(0, onetouch->dev.keybit);
 158
 159         onetouch->dev.private = onetouch;
 160         onetouch->dev.open = usb_onetouch_open;
 161         onetouch->dev.close = usb_onetouch_close;
 162
 163         usb_make_path(udev, path, sizeof(path));
 164         sprintf(onetouch->phys, "%s/input0", path);
 165
 166         onetouch->dev.name = onetouch->name;
 167         onetouch->dev.phys = onetouch->phys;
 168
 169         usb_to_input_id(udev, &onetouch->dev.id);
 170
 171         onetouch->dev.dev = &udev->dev;
 172
 173         if (udev->manufacturer)
 174                 strcat(onetouch->name, udev->manufacturer);
 175         if (udev->product)
 176                 sprintf(onetouch->name, "%s %s", onetouch->name,
 177                         udev->product);
 178         if (!strlen(onetouch->name))
 179                 sprintf(onetouch->name, "Maxtor Onetouch %04x:%04x",
 180                         onetouch->dev.id.vendor, onetouch->dev.id.product);
 181
 182         usb_fill_int_urb(onetouch->irq, udev, pipe, onetouch->data,
 183                          (maxp > 8 ? 8 : maxp),
 184                          usb_onetouch_irq, onetouch, endpoint->bInterval);
 185         onetouch->irq->transfer_dma = onetouch->data_dma;
 186         onetouch->irq->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 187
 188         ss->extra_destructor = onetouch_release_input;
 189         ss->extra = onetouch;
 190
 191         input_register_device(&onetouch->dev);
 192         printk(KERN_INFO "usb-input: %s on %s\n", onetouch->dev.name, path);
 193
 194         return 0;
 195 }
 196
 197 void onetouch_release_input(void *onetouch_)
 198 {
 199         struct usb_onetouch *onetouch = (struct usb_onetouch *) onetouch_;
 200
 201         if (onetouch) {
 202                 usb_kill_urb(onetouch->irq);
 203                 input_unregister_device(&onetouch->dev);
 204                 usb_free_urb(onetouch->irq);
 205                 usb_buffer_free(onetouch->udev, ONETOUCH_PKT_LEN,
 206                                 onetouch->data, onetouch->data_dma);
 207                 printk(KERN_INFO "usb-input: deregistering %s\n",
 208                                 onetouch->dev.name);
 209         }
 210 }