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