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 usb_interface *intf; 37 struct urb *irq; 38 char phys[32]; 39 }; 40 41 static void kbtab_irq(struct urb *urb) 42 { 43 struct kbtab *kbtab = urb->context; 44 unsigned char *data = kbtab->data; 45 struct input_dev *dev = kbtab->dev; 46 int pressure; 47 int retval; 48 49 switch (urb->status) { 50 case 0: 51 /* success */ 52 break; 53 case -ECONNRESET: 54 case -ENOENT: 55 case -ESHUTDOWN: 56 /* this urb is terminated, clean up */ 57 dev_dbg(&kbtab->intf->dev, 58 "%s - urb shutting down with status: %d\n", 59 __func__, urb->status); 60 return; 61 default: 62 dev_dbg(&kbtab->intf->dev, 63 "%s - nonzero urb status received: %d\n", 64 __func__, urb->status); 65 goto exit; 66 } 67 68 69 input_report_key(dev, BTN_TOOL_PEN, 1); 70 71 input_report_abs(dev, ABS_X, get_unaligned_le16(&data[1])); 72 input_report_abs(dev, ABS_Y, get_unaligned_le16(&data[3])); 73 74 /*input_report_key(dev, BTN_TOUCH , data[0] & 0x01);*/ 75 input_report_key(dev, BTN_RIGHT, data[0] & 0x02); 76 77 pressure = data[5]; 78 if (kb_pressure_click == -1) 79 input_report_abs(dev, ABS_PRESSURE, pressure); 80 else 81 input_report_key(dev, BTN_LEFT, pressure > kb_pressure_click ? 1 : 0); 82 83 input_sync(dev); 84 85 exit: 86 retval = usb_submit_urb(urb, GFP_ATOMIC); 87 if (retval) 88 dev_err(&kbtab->intf->dev, 89 "%s - usb_submit_urb failed with result %d\n", 90 __func__, retval); 91 } 92 93 static struct usb_device_id kbtab_ids[] = { 94 { USB_DEVICE(USB_VENDOR_ID_KBGEAR, 0x1001), .driver_info = 0 }, 95 { } 96 }; 97 98 MODULE_DEVICE_TABLE(usb, kbtab_ids); 99 100 static int kbtab_open(struct input_dev *dev) 101 { 102 struct kbtab *kbtab = input_get_drvdata(dev); 103 104 kbtab->irq->dev = kbtab->usbdev; 105 if (usb_submit_urb(kbtab->irq, GFP_KERNEL)) 106 return -EIO; 107 108 return 0; 109 } 110 111 static void kbtab_close(struct input_dev *dev) 112 { 113 struct kbtab *kbtab = input_get_drvdata(dev); 114 115 usb_kill_urb(kbtab->irq); 116 } 117 118 static int kbtab_probe(struct usb_interface *intf, const struct usb_device_id *id) 119 { 120 struct usb_device *dev = interface_to_usbdev(intf); 121 struct usb_endpoint_descriptor *endpoint; 122 struct kbtab *kbtab; 123 struct input_dev *input_dev; 124 int error = -ENOMEM; 125 126 kbtab = kzalloc(sizeof(struct kbtab), GFP_KERNEL); 127 input_dev = input_allocate_device(); 128 if (!kbtab || !input_dev) 129 goto fail1; 130 131 kbtab->data = usb_alloc_coherent(dev, 8, GFP_KERNEL, &kbtab->data_dma); 132 if (!kbtab->data) 133 goto fail1; 134 135 kbtab->irq = usb_alloc_urb(0, GFP_KERNEL); 136 if (!kbtab->irq) 137 goto fail2; 138 139 kbtab->usbdev = dev; 140 kbtab->intf = intf; 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 input_dev->keybit[BIT_WORD(BTN_LEFT)] |= 158 BIT_MASK(BTN_LEFT) | BIT_MASK(BTN_RIGHT); 159 input_dev->keybit[BIT_WORD(BTN_DIGI)] |= 160 BIT_MASK(BTN_TOOL_PEN) | BIT_MASK(BTN_TOUCH); 161 input_set_abs_params(input_dev, ABS_X, 0, 0x2000, 4, 0); 162 input_set_abs_params(input_dev, ABS_Y, 0, 0x1750, 4, 0); 163 input_set_abs_params(input_dev, ABS_PRESSURE, 0, 0xff, 0, 0); 164 165 endpoint = &intf->cur_altsetting->endpoint[0].desc; 166 167 usb_fill_int_urb(kbtab->irq, dev, 168 usb_rcvintpipe(dev, endpoint->bEndpointAddress), 169 kbtab->data, 8, 170 kbtab_irq, kbtab, endpoint->bInterval); 171 kbtab->irq->transfer_dma = kbtab->data_dma; 172 kbtab->irq->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 173 174 error = input_register_device(kbtab->dev); 175 if (error) 176 goto fail3; 177 178 usb_set_intfdata(intf, kbtab); 179 180 return 0; 181 182 fail3: usb_free_urb(kbtab->irq); 183 fail2: usb_free_coherent(dev, 8, kbtab->data, kbtab->data_dma); 184 fail1: input_free_device(input_dev); 185 kfree(kbtab); 186 return error; 187 } 188 189 static void kbtab_disconnect(struct usb_interface *intf) 190 { 191 struct kbtab *kbtab = usb_get_intfdata(intf); 192 193 usb_set_intfdata(intf, NULL); 194 195 input_unregister_device(kbtab->dev); 196 usb_free_urb(kbtab->irq); 197 usb_free_coherent(kbtab->usbdev, 8, kbtab->data, kbtab->data_dma); 198 kfree(kbtab); 199 } 200 201 static struct usb_driver kbtab_driver = { 202 .name = "kbtab", 203 .probe = kbtab_probe, 204 .disconnect = kbtab_disconnect, 205 .id_table = kbtab_ids, 206 }; 207 208 module_usb_driver(kbtab_driver); 209