drivers/input/tablet/kbtab.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 #include <linux/kernel.h>
   3 #include <linux/slab.h>
   4 #include <linux/module.h>
   5 #include <linux/usb/input.h>
   6 #include <asm/unaligned.h>
   7
   8 /*
   9  * Pressure-threshold modules param code from Alex Perry <alex.perry@ieee.org>
  10  */
  11
  12 MODULE_AUTHOR("Josh Myer <josh@joshisanerd.com>");
  13 MODULE_DESCRIPTION("USB KB Gear JamStudio Tablet driver");
  14 MODULE_LICENSE("GPL");
  15
  16 #define USB_VENDOR_ID_KBGEAR    0x084e
  17
  18 static int kb_pressure_click = 0x10;
  19 module_param(kb_pressure_click, int, 0);
  20 MODULE_PARM_DESC(kb_pressure_click, "pressure threshold for clicks");
  21
  22 struct kbtab {
  23         unsigned char *data;
  24         dma_addr_t data_dma;
  25         struct input_dev *dev;
  26         struct usb_interface *intf;
  27         struct urb *irq;
  28         char phys[32];
  29 };
  30
  31 static void kbtab_irq(struct urb *urb)
  32 {
  33         struct kbtab *kbtab = urb->context;
  34         unsigned char *data = kbtab->data;
  35         struct input_dev *dev = kbtab->dev;
  36         int pressure;
  37         int retval;
  38
  39         switch (urb->status) {
  40         case 0:
  41                 /* success */
  42                 break;
  43         case -ECONNRESET:
  44         case -ENOENT:
  45         case -ESHUTDOWN:
  46                 /* this urb is terminated, clean up */
  47                 dev_dbg(&kbtab->intf->dev,
  48                         "%s - urb shutting down with status: %d\n",
  49                         __func__, urb->status);
  50                 return;
  51         default:
  52                 dev_dbg(&kbtab->intf->dev,
  53                         "%s - nonzero urb status received: %d\n",
  54                         __func__, urb->status);
  55                 goto exit;
  56         }
  57
  58
  59         input_report_key(dev, BTN_TOOL_PEN, 1);
  60
  61         input_report_abs(dev, ABS_X, get_unaligned_le16(&data[1]));
  62         input_report_abs(dev, ABS_Y, get_unaligned_le16(&data[3]));
  63
  64         /*input_report_key(dev, BTN_TOUCH , data[0] & 0x01);*/
  65         input_report_key(dev, BTN_RIGHT, data[0] & 0x02);
  66
  67         pressure = data[5];
  68         if (kb_pressure_click == -1)
  69                 input_report_abs(dev, ABS_PRESSURE, pressure);
  70         else
  71                 input_report_key(dev, BTN_LEFT, pressure > kb_pressure_click ? 1 : 0);
  72
  73         input_sync(dev);
  74
  75  exit:
  76         retval = usb_submit_urb(urb, GFP_ATOMIC);
  77         if (retval)
  78                 dev_err(&kbtab->intf->dev,
  79                         "%s - usb_submit_urb failed with result %d\n",
  80                         __func__, retval);
  81 }
  82
  83 static const struct usb_device_id kbtab_ids[] = {
  84         { USB_DEVICE(USB_VENDOR_ID_KBGEAR, 0x1001), .driver_info = 0 },
  85         { }
  86 };
  87
  88 MODULE_DEVICE_TABLE(usb, kbtab_ids);
  89
  90 static int kbtab_open(struct input_dev *dev)
  91 {
  92         struct kbtab *kbtab = input_get_drvdata(dev);
  93         struct usb_device *udev = interface_to_usbdev(kbtab->intf);
  94
  95         kbtab->irq->dev = udev;
  96         if (usb_submit_urb(kbtab->irq, GFP_KERNEL))
  97                 return -EIO;
  98
  99         return 0;
 100 }
 101
 102 static void kbtab_close(struct input_dev *dev)
 103 {
 104         struct kbtab *kbtab = input_get_drvdata(dev);
 105
 106         usb_kill_urb(kbtab->irq);
 107 }
 108
 109 static int kbtab_probe(struct usb_interface *intf, const struct usb_device_id *id)
 110 {
 111         struct usb_device *dev = interface_to_usbdev(intf);
 112         struct usb_endpoint_descriptor *endpoint;
 113         struct kbtab *kbtab;
 114         struct input_dev *input_dev;
 115         int error = -ENOMEM;
 116
 117         if (intf->cur_altsetting->desc.bNumEndpoints < 1)
 118                 return -ENODEV;
 119
 120         endpoint = &intf->cur_altsetting->endpoint[0].desc;
 121         if (!usb_endpoint_is_int_in(endpoint))
 122                 return -ENODEV;
 123
 124         kbtab = kzalloc(sizeof(*kbtab), GFP_KERNEL);
 125         input_dev = input_allocate_device();
 126         if (!kbtab || !input_dev)
 127                 goto fail1;
 128
 129         kbtab->data = usb_alloc_coherent(dev, 8, GFP_KERNEL, &kbtab->data_dma);
 130         if (!kbtab->data)
 131                 goto fail1;
 132
 133         kbtab->irq = usb_alloc_urb(0, GFP_KERNEL);
 134         if (!kbtab->irq)
 135                 goto fail2;
 136
 137         kbtab->intf = intf;
 138         kbtab->dev = input_dev;
 139
 140         usb_make_path(dev, kbtab->phys, sizeof(kbtab->phys));
 141         strlcat(kbtab->phys, "/input0", sizeof(kbtab->phys));
 142
 143         input_dev->name = "KB Gear Tablet";
 144         input_dev->phys = kbtab->phys;
 145         usb_to_input_id(dev, &input_dev->id);
 146         input_dev->dev.parent = &intf->dev;
 147
 148         input_set_drvdata(input_dev, kbtab);
 149
 150         input_dev->open = kbtab_open;
 151         input_dev->close = kbtab_close;
 152
 153         input_dev->evbit[0] |= BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
 154         input_dev->keybit[BIT_WORD(BTN_LEFT)] |=
 155                 BIT_MASK(BTN_LEFT) | BIT_MASK(BTN_RIGHT);
 156         input_dev->keybit[BIT_WORD(BTN_DIGI)] |=
 157                 BIT_MASK(BTN_TOOL_PEN) | BIT_MASK(BTN_TOUCH);
 158         input_set_abs_params(input_dev, ABS_X, 0, 0x2000, 4, 0);
 159         input_set_abs_params(input_dev, ABS_Y, 0, 0x1750, 4, 0);
 160         input_set_abs_params(input_dev, ABS_PRESSURE, 0, 0xff, 0, 0);
 161
 162         usb_fill_int_urb(kbtab->irq, dev,
 163                          usb_rcvintpipe(dev, endpoint->bEndpointAddress),
 164                          kbtab->data, 8,
 165                          kbtab_irq, kbtab, endpoint->bInterval);
 166         kbtab->irq->transfer_dma = kbtab->data_dma;
 167         kbtab->irq->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 168
 169         error = input_register_device(kbtab->dev);
 170         if (error)
 171                 goto fail3;
 172
 173         usb_set_intfdata(intf, kbtab);
 174
 175         return 0;
 176
 177  fail3: usb_free_urb(kbtab->irq);
 178  fail2: usb_free_coherent(dev, 8, kbtab->data, kbtab->data_dma);
 179  fail1: input_free_device(input_dev);
 180         kfree(kbtab);
 181         return error;
 182 }
 183
 184 static void kbtab_disconnect(struct usb_interface *intf)
 185 {
 186         struct kbtab *kbtab = usb_get_intfdata(intf);
 187         struct usb_device *udev = interface_to_usbdev(intf);
 188
 189         usb_set_intfdata(intf, NULL);
 190
 191         input_unregister_device(kbtab->dev);
 192         usb_free_urb(kbtab->irq);
 193         usb_free_coherent(udev, 8, kbtab->data, kbtab->data_dma);
 194         kfree(kbtab);
 195 }
 196
 197 static struct usb_driver kbtab_driver = {
 198         .name =         "kbtab",
 199         .probe =        kbtab_probe,
 200         .disconnect =   kbtab_disconnect,
 201         .id_table =     kbtab_ids,
 202 };
 203
 204 module_usb_driver(kbtab_driver);