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 if (intf->cur_altsetting->desc.bNumEndpoints < 1) 126 return -ENODEV; 127 128 kbtab = kzalloc(sizeof(struct kbtab), GFP_KERNEL); 129 input_dev = input_allocate_device(); 130 if (!kbtab || !input_dev) 131 goto fail1; 132 133 kbtab->data = usb_alloc_coherent(dev, 8, GFP_KERNEL, &kbtab->data_dma); 134 if (!kbtab->data) 135 goto fail1; 136 137 kbtab->irq = usb_alloc_urb(0, GFP_KERNEL); 138 if (!kbtab->irq) 139 goto fail2; 140 141 kbtab->intf = intf; 142 kbtab->dev = input_dev; 143 144 usb_make_path(dev, kbtab->phys, sizeof(kbtab->phys)); 145 strlcat(kbtab->phys, "/input0", sizeof(kbtab->phys)); 146 147 input_dev->name = "KB Gear Tablet"; 148 input_dev->phys = kbtab->phys; 149 usb_to_input_id(dev, &input_dev->id); 150 input_dev->dev.parent = &intf->dev; 151 152 input_set_drvdata(input_dev, kbtab); 153 154 input_dev->open = kbtab_open; 155 input_dev->close = kbtab_close; 156 157 input_dev->evbit[0] |= BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); 158 input_dev->keybit[BIT_WORD(BTN_LEFT)] |= 159 BIT_MASK(BTN_LEFT) | BIT_MASK(BTN_RIGHT); 160 input_dev->keybit[BIT_WORD(BTN_DIGI)] |= 161 BIT_MASK(BTN_TOOL_PEN) | BIT_MASK(BTN_TOUCH); 162 input_set_abs_params(input_dev, ABS_X, 0, 0x2000, 4, 0); 163 input_set_abs_params(input_dev, ABS_Y, 0, 0x1750, 4, 0); 164 input_set_abs_params(input_dev, ABS_PRESSURE, 0, 0xff, 0, 0); 165 166 endpoint = &intf->cur_altsetting->endpoint[0].desc; 167 168 usb_fill_int_urb(kbtab->irq, dev, 169 usb_rcvintpipe(dev, endpoint->bEndpointAddress), 170 kbtab->data, 8, 171 kbtab_irq, kbtab, endpoint->bInterval); 172 kbtab->irq->transfer_dma = kbtab->data_dma; 173 kbtab->irq->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 174 175 error = input_register_device(kbtab->dev); 176 if (error) 177 goto fail3; 178 179 usb_set_intfdata(intf, kbtab); 180 181 return 0; 182 183 fail3: usb_free_urb(kbtab->irq); 184 fail2: usb_free_coherent(dev, 8, kbtab->data, kbtab->data_dma); 185 fail1: input_free_device(input_dev); 186 kfree(kbtab); 187 return error; 188 } 189 190 static void kbtab_disconnect(struct usb_interface *intf) 191 { 192 struct kbtab *kbtab = usb_get_intfdata(intf); 193 struct usb_device *udev = interface_to_usbdev(intf); 194 195 usb_set_intfdata(intf, NULL); 196 197 input_unregister_device(kbtab->dev); 198 usb_free_urb(kbtab->irq); 199 usb_free_coherent(udev, 8, kbtab->data, kbtab->data_dma); 200 kfree(kbtab); 201 } 202 203 static struct usb_driver kbtab_driver = { 204 .name = "kbtab", 205 .probe = kbtab_probe, 206 .disconnect = kbtab_disconnect, 207 .id_table = kbtab_ids, 208 }; 209 210 module_usb_driver(kbtab_driver); 211