cregit-Linux how code gets into the kernel

Release 4.11 drivers/input/tablet/kbtab.c

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/usb/input.h>
#include <asm/unaligned.h>

/*
 * Version Information
 * v0.0.1 - Original, extremely basic version, 2.4.xx only
 * v0.0.2 - Updated, works with 2.5.62 and 2.4.20;
 *           - added pressure-threshold modules param code from
 *              Alex Perry <alex.perry@ieee.org>
 */


#define DRIVER_VERSION "v0.0.2"

#define DRIVER_AUTHOR "Josh Myer <josh@joshisanerd.com>"

#define DRIVER_DESC "USB KB Gear JamStudio Tablet driver"

#define DRIVER_LICENSE "GPL"


MODULE_AUTHOR(DRIVER_AUTHOR);

MODULE_DESCRIPTION(DRIVER_DESC);

MODULE_LICENSE(DRIVER_LICENSE);


#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); }

Contributors

PersonTokensPropCommitsCommitProp
Josh Myer16969.83%114.29%
Dmitry Torokhov2811.57%114.29%
Greg Kroah-Hartman2711.16%342.86%
Trent Whaley156.20%114.29%
Harvey Harrison31.24%114.29%
Total242100.00%7100.00%

static 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; }

Contributors

PersonTokensPropCommitsCommitProp
Josh Myer4372.88%133.33%
Oliver Neukum1322.03%133.33%
Dmitry Torokhov35.08%133.33%
Total59100.00%3100.00%


static void kbtab_close(struct input_dev *dev) { struct kbtab *kbtab = input_get_drvdata(dev); usb_kill_urb(kbtab->irq); }

Contributors

PersonTokensPropCommitsCommitProp
Josh Myer2485.71%133.33%
Dmitry Torokhov310.71%133.33%
Borislav Petkov13.57%133.33%
Total28100.00%3100.00%


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; 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); endpoint = &intf->cur_altsetting->endpoint[0].desc; 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; }

Contributors

PersonTokensPropCommitsCommitProp
Josh Myer24451.59%16.25%
Dmitry Torokhov19040.17%637.50%
Johan Hovold163.38%16.25%
Greg Kroah-Hartman81.69%212.50%
Jiri Slaby81.69%16.25%
Alan Stern30.63%212.50%
Daniel Mack20.42%16.25%
Axel Lin10.21%16.25%
Oliver Neukum10.21%16.25%
Total473100.00%16100.00%


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); }

Contributors

PersonTokensPropCommitsCommitProp
Josh Myer5981.94%125.00%
Oliver Neukum1115.28%125.00%
Daniel Mack11.39%125.00%
Axel Lin11.39%125.00%
Total72100.00%4100.00%

static struct usb_driver kbtab_driver = { .name = "kbtab", .probe = kbtab_probe, .disconnect = kbtab_disconnect, .id_table = kbtab_ids, }; module_usb_driver(kbtab_driver);

Overall Contributors

PersonTokensPropCommitsCommitProp
Josh Myer68966.00%13.45%
Dmitry Torokhov22821.84%827.59%
Greg Kroah-Hartman474.50%724.14%
Oliver Neukum262.49%26.90%
Johan Hovold161.53%13.45%
Trent Whaley151.44%13.45%
Jiri Slaby80.77%13.45%
Daniel Mack30.29%13.45%
Alan Stern30.29%26.90%
Harvey Harrison30.29%13.45%
Art Haas20.19%13.45%
Axel Lin20.19%13.45%
David Brownell10.10%13.45%
Borislav Petkov10.10%13.45%
Total1044100.00%29100.00%
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