diff options
Diffstat (limited to 'drivers/input/tablet/kbtab.c')
| -rw-r--r-- | drivers/input/tablet/kbtab.c | 204 |
1 files changed, 204 insertions, 0 deletions
diff --git a/drivers/input/tablet/kbtab.c b/drivers/input/tablet/kbtab.c new file mode 100644 index 000000000..aa577898e --- /dev/null +++ b/drivers/input/tablet/kbtab.c @@ -0,0 +1,204 @@ +// SPDX-License-Identifier: GPL-2.0-only +#include <linux/kernel.h> +#include <linux/slab.h> +#include <linux/module.h> +#include <linux/usb/input.h> +#include <asm/unaligned.h> + +/* + * Pressure-threshold modules param code from Alex Perry <alex.perry@ieee.org> + */ + +MODULE_AUTHOR("Josh Myer <josh@joshisanerd.com>"); +MODULE_DESCRIPTION("USB KB Gear JamStudio Tablet driver"); +MODULE_LICENSE("GPL"); + +#define USB_VENDOR_ID_KBGEAR 0x084e + +static int kb_pressure_click = 0x10; +module_param(kb_pressure_click, int, 0); +MODULE_PARM_DESC(kb_pressure_click, "pressure threshold for clicks"); + +struct kbtab { + unsigned char *data; + dma_addr_t data_dma; + struct input_dev *dev; + struct usb_interface *intf; + struct urb *irq; + char phys[32]; +}; + +static void kbtab_irq(struct urb *urb) +{ + struct kbtab *kbtab = urb->context; + unsigned char *data = kbtab->data; + struct input_dev *dev = kbtab->dev; + int pressure; + int retval; + + switch (urb->status) { + case 0: + /* success */ + break; + case -ECONNRESET: + case -ENOENT: + case -ESHUTDOWN: + /* this urb is terminated, clean up */ + dev_dbg(&kbtab->intf->dev, + "%s - urb shutting down with status: %d\n", + __func__, urb->status); + return; + default: + dev_dbg(&kbtab->intf->dev, + "%s - nonzero urb status received: %d\n", + __func__, urb->status); + goto exit; + } + + + input_report_key(dev, BTN_TOOL_PEN, 1); + + input_report_abs(dev, ABS_X, get_unaligned_le16(&data[1])); + input_report_abs(dev, ABS_Y, get_unaligned_le16(&data[3])); + + /*input_report_key(dev, BTN_TOUCH , data[0] & 0x01);*/ + input_report_key(dev, BTN_RIGHT, data[0] & 0x02); + + pressure = data[5]; + if (kb_pressure_click == -1) + input_report_abs(dev, ABS_PRESSURE, pressure); + else + input_report_key(dev, BTN_LEFT, pressure > kb_pressure_click ? 1 : 0); + + input_sync(dev); + + exit: + retval = usb_submit_urb(urb, GFP_ATOMIC); + if (retval) + dev_err(&kbtab->intf->dev, + "%s - usb_submit_urb failed with result %d\n", + __func__, retval); +} + +static const struct usb_device_id kbtab_ids[] = { + { USB_DEVICE(USB_VENDOR_ID_KBGEAR, 0x1001), .driver_info = 0 }, + { } +}; + +MODULE_DEVICE_TABLE(usb, kbtab_ids); + +static int kbtab_open(struct input_dev *dev) +{ + struct kbtab *kbtab = input_get_drvdata(dev); + struct usb_device *udev = interface_to_usbdev(kbtab->intf); + + kbtab->irq->dev = udev; + if (usb_submit_urb(kbtab->irq, GFP_KERNEL)) + return -EIO; + + return 0; +} + +static void kbtab_close(struct input_dev *dev) +{ + struct kbtab *kbtab = input_get_drvdata(dev); + + usb_kill_urb(kbtab->irq); +} + +static int kbtab_probe(struct usb_interface *intf, const struct usb_device_id *id) +{ + struct usb_device *dev = interface_to_usbdev(intf); + struct usb_endpoint_descriptor *endpoint; + struct kbtab *kbtab; + struct input_dev *input_dev; + int error = -ENOMEM; + + if (intf->cur_altsetting->desc.bNumEndpoints < 1) + return -ENODEV; + + endpoint = &intf->cur_altsetting->endpoint[0].desc; + if (!usb_endpoint_is_int_in(endpoint)) + return -ENODEV; + + kbtab = kzalloc(sizeof(struct kbtab), GFP_KERNEL); + input_dev = input_allocate_device(); + if (!kbtab || !input_dev) + goto fail1; + + kbtab->data = usb_alloc_coherent(dev, 8, GFP_KERNEL, &kbtab->data_dma); + if (!kbtab->data) + goto fail1; + + kbtab->irq = usb_alloc_urb(0, GFP_KERNEL); + if (!kbtab->irq) + goto fail2; + + kbtab->intf = intf; + kbtab->dev = input_dev; + + usb_make_path(dev, kbtab->phys, sizeof(kbtab->phys)); + strlcat(kbtab->phys, "/input0", sizeof(kbtab->phys)); + + input_dev->name = "KB Gear Tablet"; + input_dev->phys = kbtab->phys; + usb_to_input_id(dev, &input_dev->id); + input_dev->dev.parent = &intf->dev; + + input_set_drvdata(input_dev, kbtab); + + input_dev->open = kbtab_open; + input_dev->close = kbtab_close; + + input_dev->evbit[0] |= BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); + input_dev->keybit[BIT_WORD(BTN_LEFT)] |= + BIT_MASK(BTN_LEFT) | BIT_MASK(BTN_RIGHT); + input_dev->keybit[BIT_WORD(BTN_DIGI)] |= + BIT_MASK(BTN_TOOL_PEN) | BIT_MASK(BTN_TOUCH); + input_set_abs_params(input_dev, ABS_X, 0, 0x2000, 4, 0); + input_set_abs_params(input_dev, ABS_Y, 0, 0x1750, 4, 0); + input_set_abs_params(input_dev, ABS_PRESSURE, 0, 0xff, 0, 0); + + usb_fill_int_urb(kbtab->irq, dev, + usb_rcvintpipe(dev, endpoint->bEndpointAddress), + kbtab->data, 8, + kbtab_irq, kbtab, endpoint->bInterval); + kbtab->irq->transfer_dma = kbtab->data_dma; + kbtab->irq->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; + + error = input_register_device(kbtab->dev); + if (error) + goto fail3; + + usb_set_intfdata(intf, kbtab); + + return 0; + + fail3: usb_free_urb(kbtab->irq); + fail2: usb_free_coherent(dev, 8, kbtab->data, kbtab->data_dma); + fail1: input_free_device(input_dev); + kfree(kbtab); + return error; +} + +static void kbtab_disconnect(struct usb_interface *intf) +{ + struct kbtab *kbtab = usb_get_intfdata(intf); + struct usb_device *udev = interface_to_usbdev(intf); + + usb_set_intfdata(intf, NULL); + + input_unregister_device(kbtab->dev); + usb_free_urb(kbtab->irq); + usb_free_coherent(udev, 8, kbtab->data, kbtab->data_dma); + kfree(kbtab); +} + +static struct usb_driver kbtab_driver = { + .name = "kbtab", + .probe = kbtab_probe, + .disconnect = kbtab_disconnect, + .id_table = kbtab_ids, +}; + +module_usb_driver(kbtab_driver); |