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_ch9.h>
  37 #include <linux/usb/input.h>
  38 #include "usb.h"
  39 #include "onetouch.h"
  40 #include "debug.h"
  41
  42 void onetouch_release_input(void *onetouch_);
  43
  44 struct usb_onetouch {
  45         char name[128];
  46         char phys[64];
  47         struct input_dev *dev;  /* input device interface */
  48         struct usb_device *udev;        /* usb device */
  49
  50         struct urb *irq;        /* urb for interrupt in report */
  51         unsigned char *data;    /* input data */
  52         dma_addr_t data_dma;
  53         unsigned int is_open:1;
  54 };
  55
  56 static void usb_onetouch_irq(struct urb *urb, struct pt_regs *regs)
  57 {
  58         struct usb_onetouch *onetouch = urb->context;
  59         signed char *data = onetouch->data;
  60         struct input_dev *dev = onetouch->dev;
  61         int status;
  62
  63         switch (urb->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_regs(dev, regs);
  76         input_report_key(dev, ONETOUCH_BUTTON, data[0] & 0x02);
  77         input_sync(dev);
  78
  79 resubmit:
  80         status = usb_submit_urb (urb, SLAB_ATOMIC);
  81         if (status)
  82                 err ("can't resubmit intr, %s-%s/input0, status %d",
  83                         onetouch->udev->bus->bus_name,
  84                         onetouch->udev->devpath, status);
  85 }
  86
  87 static int usb_onetouch_open(struct input_dev *dev)
  88 {
  89         struct usb_onetouch *onetouch = dev->private;
  90
  91         onetouch->is_open = 1;
  92         onetouch->irq->dev = onetouch->udev;
  93         if (usb_submit_urb(onetouch->irq, GFP_KERNEL)) {
  94                 err("usb_submit_urb failed");
  95                 return -EIO;
  96         }
  97
  98         return 0;
  99 }
 100
 101 static void usb_onetouch_close(struct input_dev *dev)
 102 {
 103         struct usb_onetouch *onetouch = dev->private;
 104
 105         usb_kill_urb(onetouch->irq);
 106         onetouch->is_open = 0;
 107 }
 108
 109 #ifdef CONFIG_PM
 110 static void usb_onetouch_pm_hook(struct us_data *us, int action)
 111 {
 112         struct usb_onetouch *onetouch = (struct usb_onetouch *) us->extra;
 113
 114         if (onetouch->is_open) {
 115                 switch (action) {
 116                 case US_SUSPEND:
 117                         usb_kill_urb(onetouch->irq);
 118                         break;
 119                 case US_RESUME:
 120                         if (usb_submit_urb(onetouch->irq, GFP_KERNEL) != 0)
 121                                 err("usb_submit_urb failed");
 122                         break;
 123                 default:
 124                         break;
 125                 }
 126         }
 127 }
 128 #endif /* CONFIG_PM */
 129
 130 int onetouch_connect_input(struct us_data *ss)
 131 {
 132         struct usb_device *udev = ss->pusb_dev;
 133         struct usb_host_interface *interface;
 134         struct usb_endpoint_descriptor *endpoint;
 135         struct usb_onetouch *onetouch;
 136         struct input_dev *input_dev;
 137         int pipe, maxp;
 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 (!(endpoint->bEndpointAddress & USB_DIR_IN))
 146                 return -ENODEV;
 147         if ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
 148                         != USB_ENDPOINT_XFER_INT)
 149                 return -ENODEV;
 150
 151         pipe = usb_rcvintpipe(udev, endpoint->bEndpointAddress);
 152         maxp = usb_maxpacket(udev, pipe, usb_pipeout(pipe));
 153
 154         onetouch = kzalloc(sizeof(struct usb_onetouch), GFP_KERNEL);
 155         input_dev = input_allocate_device();
 156         if (!onetouch || !input_dev)
 157                 goto fail1;
 158
 159         onetouch->data = usb_buffer_alloc(udev, ONETOUCH_PKT_LEN,
 160                                           SLAB_ATOMIC, &onetouch->data_dma);
 161         if (!onetouch->data)
 162                 goto fail1;
 163
 164         onetouch->irq = usb_alloc_urb(0, GFP_KERNEL);
 165         if (!onetouch->irq)
 166                 goto fail2;
 167
 168         onetouch->udev = udev;
 169         onetouch->dev = input_dev;
 170
 171         if (udev->manufacturer)
 172                 strlcpy(onetouch->name, udev->manufacturer,
 173                         sizeof(onetouch->name));
 174         if (udev->product) {
 175                 if (udev->manufacturer)
 176                         strlcat(onetouch->name, " ", sizeof(onetouch->name));
 177                 strlcat(onetouch->name, udev->product, sizeof(onetouch->name));
 178         }
 179
 180         if (!strlen(onetouch->name))
 181                 snprintf(onetouch->name, sizeof(onetouch->name),
 182                          "Maxtor Onetouch %04x:%04x",
 183                          le16_to_cpu(udev->descriptor.idVendor),
 184                          le16_to_cpu(udev->descriptor.idProduct));
 185
 186         usb_make_path(udev, onetouch->phys, sizeof(onetouch->phys));
 187         strlcat(onetouch->phys, "/input0", sizeof(onetouch->phys));
 188
 189         input_dev->name = onetouch->name;
 190         input_dev->phys = onetouch->phys;
 191         usb_to_input_id(udev, &input_dev->id);
 192         input_dev->cdev.dev = &udev->dev;
 193
 194         set_bit(EV_KEY, input_dev->evbit);
 195         set_bit(ONETOUCH_BUTTON, input_dev->keybit);
 196         clear_bit(0, input_dev->keybit);
 197
 198         input_dev->private = onetouch;
 199         input_dev->open = usb_onetouch_open;
 200         input_dev->close = usb_onetouch_close;
 201
 202         usb_fill_int_urb(onetouch->irq, udev, pipe, onetouch->data,
 203                          (maxp > 8 ? 8 : maxp),
 204                          usb_onetouch_irq, onetouch, endpoint->bInterval);
 205         onetouch->irq->transfer_dma = onetouch->data_dma;
 206         onetouch->irq->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 207
 208         ss->extra_destructor = onetouch_release_input;
 209         ss->extra = onetouch;
 210 #ifdef CONFIG_PM
 211         ss->suspend_resume_hook = usb_onetouch_pm_hook;
 212 #endif
 213
 214         input_register_device(onetouch->dev);
 215
 216         return 0;
 217
 218  fail2: usb_buffer_free(udev, ONETOUCH_PKT_LEN,
 219                         onetouch->data, onetouch->data_dma);
 220  fail1: kfree(onetouch);
 221         input_free_device(input_dev);
 222         return -ENOMEM;
 223 }
 224
 225 void onetouch_release_input(void *onetouch_)
 226 {
 227         struct usb_onetouch *onetouch = (struct usb_onetouch *) onetouch_;
 228
 229         if (onetouch) {
 230                 usb_kill_urb(onetouch->irq);
 231                 input_unregister_device(onetouch->dev);
 232                 usb_free_urb(onetouch->irq);
 233                 usb_buffer_free(onetouch->udev, ONETOUCH_PKT_LEN,
 234                                 onetouch->data, onetouch->data_dma);
 235         }
 236 }