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         unsigned int is_open:1;
  56 };
  57
  58 static void usb_onetouch_irq(struct urb *urb, struct pt_regs *regs)
  59 {
  60         struct usb_onetouch *onetouch = urb->context;
  61         signed char *data = onetouch->data;
  62         struct input_dev *dev = onetouch->dev;
  63         int status;
  64
  65         switch (urb->status) {
  66         case 0:                 /* success */
  67                 break;
  68         case -ECONNRESET:       /* unlink */
  69         case -ENOENT:
  70         case -ESHUTDOWN:
  71                 return;
  72         /* -EPIPE:  should clear the halt */
  73         default:                /* error */
  74                 goto resubmit;
  75         }
  76
  77         input_regs(dev, regs);
  78         input_report_key(dev, ONETOUCH_BUTTON, data[0] & 0x02);
  79         input_sync(dev);
  80
  81 resubmit:
  82         status = usb_submit_urb (urb, SLAB_ATOMIC);
  83         if (status)
  84                 err ("can't resubmit intr, %s-%s/input0, status %d",
  85                         onetouch->udev->bus->bus_name,
  86                         onetouch->udev->devpath, status);
  87 }
  88
  89 static int usb_onetouch_open(struct input_dev *dev)
  90 {
  91         struct usb_onetouch *onetouch = dev->private;
  92
  93         onetouch->is_open = 1;
  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         onetouch->is_open = 0;
 109 }
 110
 111 #ifdef CONFIG_PM
 112 static void usb_onetouch_pm_hook(struct us_data *us, int action)
 113 {
 114         struct usb_onetouch *onetouch = (struct usb_onetouch *) us->extra;
 115
 116         if (onetouch->is_open) {
 117                 switch (action) {
 118                 case US_SUSPEND:
 119                         usb_kill_urb(onetouch->irq);
 120                         break;
 121                 case US_RESUME:
 122                         if (usb_submit_urb(onetouch->irq, GFP_KERNEL) != 0)
 123                                 err("usb_submit_urb failed");
 124                         break;
 125                 default:
 126                         break;
 127                 }
 128         }
 129 }
 130 #endif /* CONFIG_PM */
 131
 132 int onetouch_connect_input(struct us_data *ss)
 133 {
 134         struct usb_device *udev = ss->pusb_dev;
 135         struct usb_host_interface *interface;
 136         struct usb_endpoint_descriptor *endpoint;
 137         struct usb_onetouch *onetouch;
 138         struct input_dev *input_dev;
 139         int pipe, maxp;
 140
 141         interface = ss->pusb_intf->cur_altsetting;
 142
 143         if (interface->desc.bNumEndpoints != 3)
 144                 return -ENODEV;
 145
 146         endpoint = &interface->endpoint[2].desc;
 147         if (!(endpoint->bEndpointAddress & USB_DIR_IN))
 148                 return -ENODEV;
 149         if ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
 150                         != USB_ENDPOINT_XFER_INT)
 151                 return -ENODEV;
 152
 153         pipe = usb_rcvintpipe(udev, endpoint->bEndpointAddress);
 154         maxp = usb_maxpacket(udev, pipe, usb_pipeout(pipe));
 155
 156         onetouch = kzalloc(sizeof(struct usb_onetouch), GFP_KERNEL);
 157         input_dev = input_allocate_device();
 158         if (!onetouch || !input_dev)
 159                 goto fail1;
 160
 161         onetouch->data = usb_buffer_alloc(udev, ONETOUCH_PKT_LEN,
 162                                           SLAB_ATOMIC, &onetouch->data_dma);
 163         if (!onetouch->data)
 164                 goto fail1;
 165
 166         onetouch->irq = usb_alloc_urb(0, GFP_KERNEL);
 167         if (!onetouch->irq)
 168                 goto fail2;
 169
 170         onetouch->udev = udev;
 171         onetouch->dev = input_dev;
 172
 173         if (udev->manufacturer)
 174                 strlcpy(onetouch->name, udev->manufacturer,
 175                         sizeof(onetouch->name));
 176         if (udev->product) {
 177                 if (udev->manufacturer)
 178                         strlcat(onetouch->name, " ", sizeof(onetouch->name));
 179                 strlcat(onetouch->name, udev->product, sizeof(onetouch->name));
 180         }
 181
 182         if (!strlen(onetouch->name))
 183                 snprintf(onetouch->name, sizeof(onetouch->name),
 184                          "Maxtor Onetouch %04x:%04x",
 185                          le16_to_cpu(udev->descriptor.idVendor),
 186                          le16_to_cpu(udev->descriptor.idProduct));
 187
 188         usb_make_path(udev, onetouch->phys, sizeof(onetouch->phys));
 189         strlcat(onetouch->phys, "/input0", sizeof(onetouch->phys));
 190
 191         input_dev->name = onetouch->name;
 192         input_dev->phys = onetouch->phys;
 193         usb_to_input_id(udev, &input_dev->id);
 194         input_dev->cdev.dev = &udev->dev;
 195
 196         set_bit(EV_KEY, input_dev->evbit);
 197         set_bit(ONETOUCH_BUTTON, input_dev->keybit);
 198         clear_bit(0, input_dev->keybit);
 199
 200         input_dev->private = onetouch;
 201         input_dev->open = usb_onetouch_open;
 202         input_dev->close = usb_onetouch_close;
 203
 204         usb_fill_int_urb(onetouch->irq, udev, pipe, onetouch->data,
 205                          (maxp > 8 ? 8 : maxp),
 206                          usb_onetouch_irq, onetouch, endpoint->bInterval);
 207         onetouch->irq->transfer_dma = onetouch->data_dma;
 208         onetouch->irq->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 209
 210         ss->extra_destructor = onetouch_release_input;
 211         ss->extra = onetouch;
 212 #ifdef CONFIG_PM
 213         ss->suspend_resume_hook = usb_onetouch_pm_hook;
 214 #endif
 215
 216         input_register_device(onetouch->dev);
 217
 218         return 0;
 219
 220  fail2: usb_buffer_free(udev, ONETOUCH_PKT_LEN,
 221                         onetouch->data, onetouch->data_dma);
 222  fail1: kfree(onetouch);
 223         input_free_device(input_dev);
 224         return -ENOMEM;
 225 }
 226
 227 void onetouch_release_input(void *onetouch_)
 228 {
 229         struct usb_onetouch *onetouch = (struct usb_onetouch *) onetouch_;
 230
 231         if (onetouch) {
 232                 usb_kill_urb(onetouch->irq);
 233                 input_unregister_device(onetouch->dev);
 234                 usb_free_urb(onetouch->irq);
 235                 usb_buffer_free(onetouch->udev, ONETOUCH_PKT_LEN,
 236                                 onetouch->data, onetouch->data_dma);
 237         }
 238 }