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Linux/drivers/input/tablet/kbtab.c

  1 #include <linux/kernel.h>
  2 #include <linux/slab.h>
  3 #include <linux/module.h>
  4 #include <linux/usb/input.h>
  5 #include <asm/unaligned.h>
  6 
  7 /*
  8  * Version Information
  9  * v0.0.1 - Original, extremely basic version, 2.4.xx only
 10  * v0.0.2 - Updated, works with 2.5.62 and 2.4.20;
 11  *           - added pressure-threshold modules param code from
 12  *              Alex Perry <alex.perry@ieee.org>
 13  */
 14 
 15 #define DRIVER_VERSION "v0.0.2"
 16 #define DRIVER_AUTHOR "Josh Myer <josh@joshisanerd.com>"
 17 #define DRIVER_DESC "USB KB Gear JamStudio Tablet driver"
 18 #define DRIVER_LICENSE "GPL"
 19 
 20 MODULE_AUTHOR(DRIVER_AUTHOR);
 21 MODULE_DESCRIPTION(DRIVER_DESC);
 22 MODULE_LICENSE(DRIVER_LICENSE);
 23 
 24 #define USB_VENDOR_ID_KBGEAR    0x084e
 25 
 26 static int kb_pressure_click = 0x10;
 27 module_param(kb_pressure_click, int, 0);
 28 MODULE_PARM_DESC(kb_pressure_click, "pressure threshold for clicks");
 29 
 30 struct kbtab {
 31         unsigned char *data;
 32         dma_addr_t data_dma;
 33         struct input_dev *dev;
 34         struct usb_interface *intf;
 35         struct urb *irq;
 36         char phys[32];
 37 };
 38 
 39 static void kbtab_irq(struct urb *urb)
 40 {
 41         struct kbtab *kbtab = urb->context;
 42         unsigned char *data = kbtab->data;
 43         struct input_dev *dev = kbtab->dev;
 44         int pressure;
 45         int retval;
 46 
 47         switch (urb->status) {
 48         case 0:
 49                 /* success */
 50                 break;
 51         case -ECONNRESET:
 52         case -ENOENT:
 53         case -ESHUTDOWN:
 54                 /* this urb is terminated, clean up */
 55                 dev_dbg(&kbtab->intf->dev,
 56                         "%s - urb shutting down with status: %d\n",
 57                         __func__, urb->status);
 58                 return;
 59         default:
 60                 dev_dbg(&kbtab->intf->dev,
 61                         "%s - nonzero urb status received: %d\n",
 62                         __func__, urb->status);
 63                 goto exit;
 64         }
 65 
 66 
 67         input_report_key(dev, BTN_TOOL_PEN, 1);
 68 
 69         input_report_abs(dev, ABS_X, get_unaligned_le16(&data[1]));
 70         input_report_abs(dev, ABS_Y, get_unaligned_le16(&data[3]));
 71 
 72         /*input_report_key(dev, BTN_TOUCH , data[0] & 0x01);*/
 73         input_report_key(dev, BTN_RIGHT, data[0] & 0x02);
 74 
 75         pressure = data[5];
 76         if (kb_pressure_click == -1)
 77                 input_report_abs(dev, ABS_PRESSURE, pressure);
 78         else
 79                 input_report_key(dev, BTN_LEFT, pressure > kb_pressure_click ? 1 : 0);
 80 
 81         input_sync(dev);
 82 
 83  exit:
 84         retval = usb_submit_urb(urb, GFP_ATOMIC);
 85         if (retval)
 86                 dev_err(&kbtab->intf->dev,
 87                         "%s - usb_submit_urb failed with result %d\n",
 88                         __func__, retval);
 89 }
 90 
 91 static struct usb_device_id kbtab_ids[] = {
 92         { USB_DEVICE(USB_VENDOR_ID_KBGEAR, 0x1001), .driver_info = 0 },
 93         { }
 94 };
 95 
 96 MODULE_DEVICE_TABLE(usb, kbtab_ids);
 97 
 98 static int kbtab_open(struct input_dev *dev)
 99 {
100         struct kbtab *kbtab = input_get_drvdata(dev);
101         struct usb_device *udev = interface_to_usbdev(kbtab->intf);
102 
103         kbtab->irq->dev = udev;
104         if (usb_submit_urb(kbtab->irq, GFP_KERNEL))
105                 return -EIO;
106 
107         return 0;
108 }
109 
110 static void kbtab_close(struct input_dev *dev)
111 {
112         struct kbtab *kbtab = input_get_drvdata(dev);
113 
114         usb_kill_urb(kbtab->irq);
115 }
116 
117 static int kbtab_probe(struct usb_interface *intf, const struct usb_device_id *id)
118 {
119         struct usb_device *dev = interface_to_usbdev(intf);
120         struct usb_endpoint_descriptor *endpoint;
121         struct kbtab *kbtab;
122         struct input_dev *input_dev;
123         int error = -ENOMEM;
124 
125         kbtab = kzalloc(sizeof(struct kbtab), GFP_KERNEL);
126         input_dev = input_allocate_device();
127         if (!kbtab || !input_dev)
128                 goto fail1;
129 
130         kbtab->data = usb_alloc_coherent(dev, 8, GFP_KERNEL, &kbtab->data_dma);
131         if (!kbtab->data)
132                 goto fail1;
133 
134         kbtab->irq = usb_alloc_urb(0, GFP_KERNEL);
135         if (!kbtab->irq)
136                 goto fail2;
137 
138         kbtab->intf = intf;
139         kbtab->dev = input_dev;
140 
141         usb_make_path(dev, kbtab->phys, sizeof(kbtab->phys));
142         strlcat(kbtab->phys, "/input0", sizeof(kbtab->phys));
143 
144         input_dev->name = "KB Gear Tablet";
145         input_dev->phys = kbtab->phys;
146         usb_to_input_id(dev, &input_dev->id);
147         input_dev->dev.parent = &intf->dev;
148 
149         input_set_drvdata(input_dev, kbtab);
150 
151         input_dev->open = kbtab_open;
152         input_dev->close = kbtab_close;
153 
154         input_dev->evbit[0] |= BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
155         input_dev->keybit[BIT_WORD(BTN_LEFT)] |=
156                 BIT_MASK(BTN_LEFT) | BIT_MASK(BTN_RIGHT);
157         input_dev->keybit[BIT_WORD(BTN_DIGI)] |=
158                 BIT_MASK(BTN_TOOL_PEN) | BIT_MASK(BTN_TOUCH);
159         input_set_abs_params(input_dev, ABS_X, 0, 0x2000, 4, 0);
160         input_set_abs_params(input_dev, ABS_Y, 0, 0x1750, 4, 0);
161         input_set_abs_params(input_dev, ABS_PRESSURE, 0, 0xff, 0, 0);
162 
163         endpoint = &intf->cur_altsetting->endpoint[0].desc;
164 
165         usb_fill_int_urb(kbtab->irq, dev,
166                          usb_rcvintpipe(dev, endpoint->bEndpointAddress),
167                          kbtab->data, 8,
168                          kbtab_irq, kbtab, endpoint->bInterval);
169         kbtab->irq->transfer_dma = kbtab->data_dma;
170         kbtab->irq->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
171 
172         error = input_register_device(kbtab->dev);
173         if (error)
174                 goto fail3;
175 
176         usb_set_intfdata(intf, kbtab);
177 
178         return 0;
179 
180  fail3: usb_free_urb(kbtab->irq);
181  fail2: usb_free_coherent(dev, 8, kbtab->data, kbtab->data_dma);
182  fail1: input_free_device(input_dev);
183         kfree(kbtab);
184         return error;
185 }
186 
187 static void kbtab_disconnect(struct usb_interface *intf)
188 {
189         struct kbtab *kbtab = usb_get_intfdata(intf);
190         struct usb_device *udev = interface_to_usbdev(intf);
191 
192         usb_set_intfdata(intf, NULL);
193 
194         input_unregister_device(kbtab->dev);
195         usb_free_urb(kbtab->irq);
196         usb_free_coherent(udev, 8, kbtab->data, kbtab->data_dma);
197         kfree(kbtab);
198 }
199 
200 static struct usb_driver kbtab_driver = {
201         .name =         "kbtab",
202         .probe =        kbtab_probe,
203         .disconnect =   kbtab_disconnect,
204         .id_table =     kbtab_ids,
205 };
206 
207 module_usb_driver(kbtab_driver);
208 

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