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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_device *usbdev;
 35         struct usb_interface *intf;
 36         struct urb *irq;
 37         char phys[32];
 38 };
 39 
 40 static void kbtab_irq(struct urb *urb)
 41 {
 42         struct kbtab *kbtab = urb->context;
 43         unsigned char *data = kbtab->data;
 44         struct input_dev *dev = kbtab->dev;
 45         int pressure;
 46         int retval;
 47 
 48         switch (urb->status) {
 49         case 0:
 50                 /* success */
 51                 break;
 52         case -ECONNRESET:
 53         case -ENOENT:
 54         case -ESHUTDOWN:
 55                 /* this urb is terminated, clean up */
 56                 dev_dbg(&kbtab->intf->dev,
 57                         "%s - urb shutting down with status: %d\n",
 58                         __func__, urb->status);
 59                 return;
 60         default:
 61                 dev_dbg(&kbtab->intf->dev,
 62                         "%s - nonzero urb status received: %d\n",
 63                         __func__, urb->status);
 64                 goto exit;
 65         }
 66 
 67 
 68         input_report_key(dev, BTN_TOOL_PEN, 1);
 69 
 70         input_report_abs(dev, ABS_X, get_unaligned_le16(&data[1]));
 71         input_report_abs(dev, ABS_Y, get_unaligned_le16(&data[3]));
 72 
 73         /*input_report_key(dev, BTN_TOUCH , data[0] & 0x01);*/
 74         input_report_key(dev, BTN_RIGHT, data[0] & 0x02);
 75 
 76         pressure = data[5];
 77         if (kb_pressure_click == -1)
 78                 input_report_abs(dev, ABS_PRESSURE, pressure);
 79         else
 80                 input_report_key(dev, BTN_LEFT, pressure > kb_pressure_click ? 1 : 0);
 81 
 82         input_sync(dev);
 83 
 84  exit:
 85         retval = usb_submit_urb(urb, GFP_ATOMIC);
 86         if (retval)
 87                 dev_err(&kbtab->intf->dev,
 88                         "%s - usb_submit_urb failed with result %d\n",
 89                         __func__, retval);
 90 }
 91 
 92 static struct usb_device_id kbtab_ids[] = {
 93         { USB_DEVICE(USB_VENDOR_ID_KBGEAR, 0x1001), .driver_info = 0 },
 94         { }
 95 };
 96 
 97 MODULE_DEVICE_TABLE(usb, kbtab_ids);
 98 
 99 static int kbtab_open(struct input_dev *dev)
100 {
101         struct kbtab *kbtab = input_get_drvdata(dev);
102 
103         kbtab->irq->dev = kbtab->usbdev;
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->usbdev = dev;
139         kbtab->intf = intf;
140         kbtab->dev = input_dev;
141 
142         usb_make_path(dev, kbtab->phys, sizeof(kbtab->phys));
143         strlcat(kbtab->phys, "/input0", sizeof(kbtab->phys));
144 
145         input_dev->name = "KB Gear Tablet";
146         input_dev->phys = kbtab->phys;
147         usb_to_input_id(dev, &input_dev->id);
148         input_dev->dev.parent = &intf->dev;
149 
150         input_set_drvdata(input_dev, kbtab);
151 
152         input_dev->open = kbtab_open;
153         input_dev->close = kbtab_close;
154 
155         input_dev->evbit[0] |= BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
156         input_dev->keybit[BIT_WORD(BTN_LEFT)] |=
157                 BIT_MASK(BTN_LEFT) | BIT_MASK(BTN_RIGHT);
158         input_dev->keybit[BIT_WORD(BTN_DIGI)] |=
159                 BIT_MASK(BTN_TOOL_PEN) | BIT_MASK(BTN_TOUCH);
160         input_set_abs_params(input_dev, ABS_X, 0, 0x2000, 4, 0);
161         input_set_abs_params(input_dev, ABS_Y, 0, 0x1750, 4, 0);
162         input_set_abs_params(input_dev, ABS_PRESSURE, 0, 0xff, 0, 0);
163 
164         endpoint = &intf->cur_altsetting->endpoint[0].desc;
165 
166         usb_fill_int_urb(kbtab->irq, dev,
167                          usb_rcvintpipe(dev, endpoint->bEndpointAddress),
168                          kbtab->data, 8,
169                          kbtab_irq, kbtab, endpoint->bInterval);
170         kbtab->irq->transfer_dma = kbtab->data_dma;
171         kbtab->irq->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
172 
173         error = input_register_device(kbtab->dev);
174         if (error)
175                 goto fail3;
176 
177         usb_set_intfdata(intf, kbtab);
178 
179         return 0;
180 
181  fail3: usb_free_urb(kbtab->irq);
182  fail2: usb_free_coherent(dev, 8, kbtab->data, kbtab->data_dma);
183  fail1: input_free_device(input_dev);
184         kfree(kbtab);
185         return error;
186 }
187 
188 static void kbtab_disconnect(struct usb_interface *intf)
189 {
190         struct kbtab *kbtab = usb_get_intfdata(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(kbtab->usbdev, 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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