1 #include <linux/kernel.h> 2 #include <linux/slab.h> 3 #include <linux/module.h> 4 #include <linux/init.h> 5 #include <linux/usb/input.h> 6 #include <asm/unaligned.h> 7 8 /* 9 * Version Information 10 * v0.0.1 - Original, extremely basic version, 2.4.xx only 11 * v0.0.2 - Updated, works with 2.5.62 and 2.4.20; 12 * - added pressure-threshold modules param code from 13 * Alex Perry <alex.perry@ieee.org> 14 */ 15 16 #define DRIVER_VERSION "v0.0.2" 17 #define DRIVER_AUTHOR "Josh Myer <josh@joshisanerd.com>" 18 #define DRIVER_DESC "USB KB Gear JamStudio Tablet driver" 19 #define DRIVER_LICENSE "GPL" 20 21 MODULE_AUTHOR(DRIVER_AUTHOR); 22 MODULE_DESCRIPTION(DRIVER_DESC); 23 MODULE_LICENSE(DRIVER_LICENSE); 24 25 #define USB_VENDOR_ID_KBGEAR 0x084e 26 27 static int kb_pressure_click = 0x10; 28 module_param(kb_pressure_click, int, 0); 29 MODULE_PARM_DESC(kb_pressure_click, "pressure threshold for clicks"); 30 31 struct kbtab { 32 unsigned char *data; 33 dma_addr_t data_dma; 34 struct input_dev *dev; 35 struct usb_device *usbdev; 36 struct urb *irq; 37 int x, y; 38 int button; 39 int pressure; 40 __u32 serial[2]; 41 char phys[32]; 42 }; 43 44 static void kbtab_irq(struct urb *urb) 45 { 46 struct kbtab *kbtab = urb->context; 47 unsigned char *data = kbtab->data; 48 struct input_dev *dev = kbtab->dev; 49 int retval; 50 51 switch (urb->status) { 52 case 0: 53 /* success */ 54 break; 55 case -ECONNRESET: 56 case -ENOENT: 57 case -ESHUTDOWN: 58 /* this urb is terminated, clean up */ 59 dbg("%s - urb shutting down with status: %d", __func__, urb->status); 60 return; 61 default: 62 dbg("%s - nonzero urb status received: %d", __func__, urb->status); 63 goto exit; 64 } 65 66 kbtab->x = get_unaligned_le16(&data[1]); 67 kbtab->y = get_unaligned_le16(&data[3]); 68 69 kbtab->pressure = (data[5]); 70 71 input_report_key(dev, BTN_TOOL_PEN, 1); 72 73 input_report_abs(dev, ABS_X, kbtab->x); 74 input_report_abs(dev, ABS_Y, kbtab->y); 75 76 /*input_report_key(dev, BTN_TOUCH , data[0] & 0x01);*/ 77 input_report_key(dev, BTN_RIGHT, data[0] & 0x02); 78 79 if (-1 == kb_pressure_click) { 80 input_report_abs(dev, ABS_PRESSURE, kbtab->pressure); 81 } else { 82 input_report_key(dev, BTN_LEFT, (kbtab->pressure > kb_pressure_click) ? 1 : 0); 83 }; 84 85 input_sync(dev); 86 87 exit: 88 retval = usb_submit_urb (urb, GFP_ATOMIC); 89 if (retval) 90 err ("%s - usb_submit_urb failed with result %d", 91 __func__, retval); 92 } 93 94 static struct usb_device_id kbtab_ids[] = { 95 { USB_DEVICE(USB_VENDOR_ID_KBGEAR, 0x1001), .driver_info = 0 }, 96 { } 97 }; 98 99 MODULE_DEVICE_TABLE(usb, kbtab_ids); 100 101 static int kbtab_open(struct input_dev *dev) 102 { 103 struct kbtab *kbtab = input_get_drvdata(dev); 104 105 kbtab->irq->dev = kbtab->usbdev; 106 if (usb_submit_urb(kbtab->irq, GFP_KERNEL)) 107 return -EIO; 108 109 return 0; 110 } 111 112 static void kbtab_close(struct input_dev *dev) 113 { 114 struct kbtab *kbtab = input_get_drvdata(dev); 115 116 usb_kill_urb(kbtab->irq); 117 } 118 119 static int kbtab_probe(struct usb_interface *intf, const struct usb_device_id *id) 120 { 121 struct usb_device *dev = interface_to_usbdev(intf); 122 struct usb_endpoint_descriptor *endpoint; 123 struct kbtab *kbtab; 124 struct input_dev *input_dev; 125 int error = -ENOMEM; 126 127 kbtab = kzalloc(sizeof(struct kbtab), GFP_KERNEL); 128 input_dev = input_allocate_device(); 129 if (!kbtab || !input_dev) 130 goto fail1; 131 132 kbtab->data = usb_buffer_alloc(dev, 8, GFP_KERNEL, &kbtab->data_dma); 133 if (!kbtab->data) 134 goto fail1; 135 136 kbtab->irq = usb_alloc_urb(0, GFP_KERNEL); 137 if (!kbtab->irq) 138 goto fail2; 139 140 kbtab->usbdev = dev; 141 kbtab->dev = input_dev; 142 143 usb_make_path(dev, kbtab->phys, sizeof(kbtab->phys)); 144 strlcat(kbtab->phys, "/input0", sizeof(kbtab->phys)); 145 146 input_dev->name = "KB Gear Tablet"; 147 input_dev->phys = kbtab->phys; 148 usb_to_input_id(dev, &input_dev->id); 149 input_dev->dev.parent = &intf->dev; 150 151 input_set_drvdata(input_dev, kbtab); 152 153 input_dev->open = kbtab_open; 154 input_dev->close = kbtab_close; 155 156 input_dev->evbit[0] |= BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) | 157 BIT_MASK(EV_MSC); 158 input_dev->keybit[BIT_WORD(BTN_LEFT)] |= BIT_MASK(BTN_LEFT) | 159 BIT_MASK(BTN_RIGHT) | BIT_MASK(BTN_MIDDLE); 160 input_dev->keybit[BIT_WORD(BTN_DIGI)] |= BIT_MASK(BTN_TOOL_PEN) | 161 BIT_MASK(BTN_TOUCH); 162 input_dev->mscbit[0] |= BIT_MASK(MSC_SERIAL); 163 input_set_abs_params(input_dev, ABS_X, 0, 0x2000, 4, 0); 164 input_set_abs_params(input_dev, ABS_Y, 0, 0x1750, 4, 0); 165 input_set_abs_params(input_dev, ABS_PRESSURE, 0, 0xff, 0, 0); 166 167 endpoint = &intf->cur_altsetting->endpoint[0].desc; 168 169 usb_fill_int_urb(kbtab->irq, dev, 170 usb_rcvintpipe(dev, endpoint->bEndpointAddress), 171 kbtab->data, 8, 172 kbtab_irq, kbtab, endpoint->bInterval); 173 kbtab->irq->transfer_dma = kbtab->data_dma; 174 kbtab->irq->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 175 176 error = input_register_device(kbtab->dev); 177 if (error) 178 goto fail3; 179 180 usb_set_intfdata(intf, kbtab); 181 182 return 0; 183 184 fail3: usb_free_urb(kbtab->irq); 185 fail2: usb_buffer_free(dev, 10, kbtab->data, kbtab->data_dma); 186 fail1: input_free_device(input_dev); 187 kfree(kbtab); 188 return error; 189 } 190 191 static void kbtab_disconnect(struct usb_interface *intf) 192 { 193 struct kbtab *kbtab = usb_get_intfdata(intf); 194 195 usb_set_intfdata(intf, NULL); 196 if (kbtab) { 197 usb_kill_urb(kbtab->irq); 198 input_unregister_device(kbtab->dev); 199 usb_free_urb(kbtab->irq); 200 usb_buffer_free(interface_to_usbdev(intf), 10, kbtab->data, kbtab->data_dma); 201 kfree(kbtab); 202 } 203 } 204 205 static struct usb_driver kbtab_driver = { 206 .name = "kbtab", 207 .probe = kbtab_probe, 208 .disconnect = kbtab_disconnect, 209 .id_table = kbtab_ids, 210 }; 211 212 static int __init kbtab_init(void) 213 { 214 int retval; 215 retval = usb_register(&kbtab_driver); 216 if (retval) 217 goto out; 218 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":" 219 DRIVER_DESC "\n"); 220 out: 221 return retval; 222 } 223 224 static void __exit kbtab_exit(void) 225 { 226 usb_deregister(&kbtab_driver); 227 } 228 229 module_init(kbtab_init); 230 module_exit(kbtab_exit); 231