cregit-Linux how code gets into the kernel

Release 4.7 drivers/input/joystick/maplecontrol.c

/*
 *      SEGA Dreamcast controller driver
 *      Based on drivers/usb/iforce.c
 *
 *      Copyright Yaegashi Takeshi, 2001
 *      Adrian McMenamin, 2008 - 2009
 */

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/input.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/timer.h>
#include <linux/maple.h>

MODULE_AUTHOR("Adrian McMenamin <adrian@mcmen.demon.co.uk>");
MODULE_DESCRIPTION("SEGA Dreamcast controller driver");
MODULE_LICENSE("GPL");


struct dc_pad {
	
struct input_dev *dev;
	
struct maple_device *mdev;
};


static void dc_pad_callback(struct mapleq *mq) { unsigned short buttons; struct maple_device *mapledev = mq->dev; struct dc_pad *pad = maple_get_drvdata(mapledev); struct input_dev *dev = pad->dev; unsigned char *res = mq->recvbuf->buf; buttons = ~le16_to_cpup((__le16 *)(res + 8)); input_report_abs(dev, ABS_HAT0Y, (buttons & 0x0010 ? -1 : 0) + (buttons & 0x0020 ? 1 : 0)); input_report_abs(dev, ABS_HAT0X, (buttons & 0x0040 ? -1 : 0) + (buttons & 0x0080 ? 1 : 0)); input_report_abs(dev, ABS_HAT1Y, (buttons & 0x1000 ? -1 : 0) + (buttons & 0x2000 ? 1 : 0)); input_report_abs(dev, ABS_HAT1X, (buttons & 0x4000 ? -1 : 0) + (buttons & 0x8000 ? 1 : 0)); input_report_key(dev, BTN_C, buttons & 0x0001); input_report_key(dev, BTN_B, buttons & 0x0002); input_report_key(dev, BTN_A, buttons & 0x0004); input_report_key(dev, BTN_START, buttons & 0x0008); input_report_key(dev, BTN_Z, buttons & 0x0100); input_report_key(dev, BTN_Y, buttons & 0x0200); input_report_key(dev, BTN_X, buttons & 0x0400); input_report_key(dev, BTN_SELECT, buttons & 0x0800); input_report_abs(dev, ABS_GAS, res[10]); input_report_abs(dev, ABS_BRAKE, res[11]); input_report_abs(dev, ABS_X, res[12]); input_report_abs(dev, ABS_Y, res[13]); input_report_abs(dev, ABS_RX, res[14]); input_report_abs(dev, ABS_RY, res[15]); }

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adrian mcmenaminadrian mcmenamin342100.00%2100.00%
Total342100.00%2100.00%


static int dc_pad_open(struct input_dev *dev) { struct dc_pad *pad = dev_get_platdata(&dev->dev); maple_getcond_callback(pad->mdev, dc_pad_callback, HZ/20, MAPLE_FUNC_CONTROLLER); return 0; }

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adrian mcmenaminadrian mcmenamin3890.48%150.00%
jingoo hanjingoo han49.52%150.00%
Total42100.00%2100.00%


static void dc_pad_close(struct input_dev *dev) { struct dc_pad *pad = dev_get_platdata(&dev->dev); maple_getcond_callback(pad->mdev, dc_pad_callback, 0, MAPLE_FUNC_CONTROLLER); }

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adrian mcmenaminadrian mcmenamin3389.19%150.00%
jingoo hanjingoo han410.81%150.00%
Total37100.00%2100.00%

/* allow the controller to be used */
static int probe_maple_controller(struct device *dev) { static const short btn_bit[32] = { BTN_C, BTN_B, BTN_A, BTN_START, -1, -1, -1, -1, BTN_Z, BTN_Y, BTN_X, BTN_SELECT, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, }; static const short abs_bit[32] = { -1, -1, -1, -1, ABS_HAT0Y, ABS_HAT0Y, ABS_HAT0X, ABS_HAT0X, -1, -1, -1, -1, ABS_HAT1Y, ABS_HAT1Y, ABS_HAT1X, ABS_HAT1X, ABS_GAS, ABS_BRAKE, ABS_X, ABS_Y, ABS_RX, ABS_RY, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, }; struct maple_device *mdev = to_maple_dev(dev); struct maple_driver *mdrv = to_maple_driver(dev->driver); int i, error; struct dc_pad *pad; struct input_dev *idev; unsigned long data = be32_to_cpu(mdev->devinfo.function_data[0]); pad = kzalloc(sizeof(struct dc_pad), GFP_KERNEL); idev = input_allocate_device(); if (!pad || !idev) { error = -ENOMEM; goto fail; } pad->dev = idev; pad->mdev = mdev; idev->open = dc_pad_open; idev->close = dc_pad_close; for (i = 0; i < 32; i++) { if (data & (1 << i)) { if (btn_bit[i] >= 0) __set_bit(btn_bit[i], idev->keybit); else if (abs_bit[i] >= 0) __set_bit(abs_bit[i], idev->absbit); } } if (idev->keybit[BIT_WORD(BTN_JOYSTICK)]) idev->evbit[0] |= BIT_MASK(EV_KEY); if (idev->absbit[0]) idev->evbit[0] |= BIT_MASK(EV_ABS); for (i = ABS_X; i <= ABS_BRAKE; i++) input_set_abs_params(idev, i, 0, 255, 0, 0); for (i = ABS_HAT0X; i <= ABS_HAT3Y; i++) input_set_abs_params(idev, i, 1, -1, 0, 0); idev->dev.platform_data = pad; idev->dev.parent = &mdev->dev; idev->name = mdev->product_name; idev->id.bustype = BUS_HOST; input_set_drvdata(idev, pad); error = input_register_device(idev); if (error) goto fail; mdev->driver = mdrv; maple_set_drvdata(mdev, pad); return 0; fail: input_free_device(idev); kfree(pad); maple_set_drvdata(mdev, NULL); return error; }

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adrian mcmenaminadrian mcmenamin580100.00%1100.00%
Total580100.00%1100.00%


static int remove_maple_controller(struct device *dev) { struct maple_device *mdev = to_maple_dev(dev); struct dc_pad *pad = maple_get_drvdata(mdev); mdev->callback = NULL; input_unregister_device(pad->dev); maple_set_drvdata(mdev, NULL); kfree(pad); return 0; }

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adrian mcmenaminadrian mcmenamin59100.00%1100.00%
Total59100.00%1100.00%

static struct maple_driver dc_pad_driver = { .function = MAPLE_FUNC_CONTROLLER, .drv = { .name = "Dreamcast_controller", .probe = probe_maple_controller, .remove = remove_maple_controller, }, };
static int __init dc_pad_init(void) { return maple_driver_register(&dc_pad_driver); }

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adrian mcmenaminadrian mcmenamin16100.00%1100.00%
Total16100.00%1100.00%


static void __exit dc_pad_exit(void) { maple_driver_unregister(&dc_pad_driver); }

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adrian mcmenaminadrian mcmenamin15100.00%1100.00%
Total15100.00%1100.00%

module_init(dc_pad_init); module_exit(dc_pad_exit);

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adrian mcmenaminadrian mcmenamin117899.33%266.67%
jingoo hanjingoo han80.67%133.33%
Total1186100.00%3100.00%
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