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_ch9.h>
  38 #include <linux/usb/input.h>
  39 #include "usb.h"
  40 #include "onetouch.h"
  41 #include "debug.h"
  42
  43 void onetouch_release_input(void *onetouch_);
  44
  45 struct usb_onetouch {
  46         char name[128];
  47         char phys[64];
  48         struct input_dev *dev;  /* input device interface */
  49         struct usb_device *udev;        /* usb device */
  50
  51         struct urb *irq;        /* urb for interrupt in report */
  52         unsigned char *data;    /* input data */
  53         dma_addr_t data_dma;
  54         unsigned int is_open:1;
  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         input_report_key(dev, ONETOUCH_BUTTON, data[0] & 0x02);
  78         input_sync(dev);
  79
  80 resubmit:
  81         status = usb_submit_urb (urb, SLAB_ATOMIC);
  82         if (status)
  83                 err ("can't resubmit intr, %s-%s/input0, status %d",
  84                         onetouch->udev->bus->bus_name,
  85                         onetouch->udev->devpath, status);
  86 }
  87
  88 static int usb_onetouch_open(struct input_dev *dev)
  89 {
  90         struct usb_onetouch *onetouch = dev->private;
  91
  92         onetouch->is_open = 1;
  93         onetouch->irq->dev = onetouch->udev;
  94         if (usb_submit_urb(onetouch->irq, GFP_KERNEL)) {
  95                 err("usb_submit_urb failed");
  96                 return -EIO;
  97         }
  98
  99         return 0;
 100 }
 101
 102 static void usb_onetouch_close(struct input_dev *dev)
 103 {
 104         struct usb_onetouch *onetouch = dev->private;
 105
 106         usb_kill_urb(onetouch->irq);
 107         onetouch->is_open = 0;
 108 }
 109
 110 #ifdef CONFIG_PM
 111 static void usb_onetouch_pm_hook(struct us_data *us, int action)
 112 {
 113         struct usb_onetouch *onetouch = (struct usb_onetouch *) us->extra;
 114
 115         if (onetouch->is_open) {
 116                 switch (action) {
 117                 case US_SUSPEND:
 118                         usb_kill_urb(onetouch->irq);
 119                         break;
 120                 case US_RESUME:
 121                         if (usb_submit_urb(onetouch->irq, GFP_KERNEL) != 0)
 122                                 err("usb_submit_urb failed");
 123                         break;
 124                 default:
 125                         break;
 126                 }
 127         }
 128 }
 129 #endif /* CONFIG_PM */
 130
 131 int onetouch_connect_input(struct us_data *ss)
 132 {
 133         struct usb_device *udev = ss->pusb_dev;
 134         struct usb_host_interface *interface;
 135         struct usb_endpoint_descriptor *endpoint;
 136         struct usb_onetouch *onetouch;
 137         struct input_dev *input_dev;
 138         int pipe, maxp;
 139
 140         interface = ss->pusb_intf->cur_altsetting;
 141
 142         if (interface->desc.bNumEndpoints != 3)
 143                 return -ENODEV;
 144
 145         endpoint = &interface->endpoint[2].desc;
 146         if (!(endpoint->bEndpointAddress & USB_DIR_IN))
 147                 return -ENODEV;
 148         if ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
 149                         != USB_ENDPOINT_XFER_INT)
 150                 return -ENODEV;
 151
 152         pipe = usb_rcvintpipe(udev, endpoint->bEndpointAddress);
 153         maxp = usb_maxpacket(udev, pipe, usb_pipeout(pipe));
 154
 155         onetouch = kzalloc(sizeof(struct usb_onetouch), GFP_KERNEL);
 156         input_dev = input_allocate_device();
 157         if (!onetouch || !input_dev)
 158                 goto fail1;
 159
 160         onetouch->data = usb_buffer_alloc(udev, ONETOUCH_PKT_LEN,
 161                                           SLAB_ATOMIC, &onetouch->data_dma);
 162         if (!onetouch->data)
 163                 goto fail1;
 164
 165         onetouch->irq = usb_alloc_urb(0, GFP_KERNEL);
 166         if (!onetouch->irq)
 167                 goto fail2;
 168
 169         onetouch->udev = udev;
 170         onetouch->dev = input_dev;
 171
 172         if (udev->manufacturer)
 173                 strlcpy(onetouch->name, udev->manufacturer,
 174                         sizeof(onetouch->name));
 175         if (udev->product) {
 176                 if (udev->manufacturer)
 177                         strlcat(onetouch->name, " ", sizeof(onetouch->name));
 178                 strlcat(onetouch->name, udev->product, sizeof(onetouch->name));
 179         }
 180
 181         if (!strlen(onetouch->name))
 182                 snprintf(onetouch->name, sizeof(onetouch->name),
 183                          "Maxtor Onetouch %04x:%04x",
 184                          le16_to_cpu(udev->descriptor.idVendor),
 185                          le16_to_cpu(udev->descriptor.idProduct));
 186
 187         usb_make_path(udev, onetouch->phys, sizeof(onetouch->phys));
 188         strlcat(onetouch->phys, "/input0", sizeof(onetouch->phys));
 189
 190         input_dev->name = onetouch->name;
 191         input_dev->phys = onetouch->phys;
 192         usb_to_input_id(udev, &input_dev->id);
 193         input_dev->cdev.dev = &udev->dev;
 194
 195         set_bit(EV_KEY, input_dev->evbit);
 196         set_bit(ONETOUCH_BUTTON, input_dev->keybit);
 197         clear_bit(0, input_dev->keybit);
 198
 199         input_dev->private = onetouch;
 200         input_dev->open = usb_onetouch_open;
 201         input_dev->close = usb_onetouch_close;
 202
 203         usb_fill_int_urb(onetouch->irq, udev, pipe, onetouch->data,
 204                          (maxp > 8 ? 8 : maxp),
 205                          usb_onetouch_irq, onetouch, endpoint->bInterval);
 206         onetouch->irq->transfer_dma = onetouch->data_dma;
 207         onetouch->irq->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 208
 209         ss->extra_destructor = onetouch_release_input;
 210         ss->extra = onetouch;
 211 #ifdef CONFIG_PM
 212         ss->suspend_resume_hook = usb_onetouch_pm_hook;
 213 #endif
 214
 215         input_register_device(onetouch->dev);
 216
 217         return 0;
 218
 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 -ENOMEM;
 224 }
 225
 226 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 }