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1125 lines
26 KiB
1125 lines
26 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Input driver to ExplorerPS/2 device driver module. |
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* |
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* Copyright (c) 1999-2002 Vojtech Pavlik |
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* Copyright (c) 2004 Dmitry Torokhov |
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*/ |
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|
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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#define MOUSEDEV_MINOR_BASE 32 |
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#define MOUSEDEV_MINORS 31 |
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#define MOUSEDEV_MIX 63 |
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#include <linux/bitops.h> |
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#include <linux/sched.h> |
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#include <linux/slab.h> |
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#include <linux/poll.h> |
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#include <linux/module.h> |
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#include <linux/init.h> |
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#include <linux/input.h> |
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#include <linux/random.h> |
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#include <linux/major.h> |
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#include <linux/device.h> |
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#include <linux/cdev.h> |
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#include <linux/kernel.h> |
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MODULE_AUTHOR("Vojtech Pavlik <[email protected]>"); |
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MODULE_DESCRIPTION("Mouse (ExplorerPS/2) device interfaces"); |
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MODULE_LICENSE("GPL"); |
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#ifndef CONFIG_INPUT_MOUSEDEV_SCREEN_X |
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#define CONFIG_INPUT_MOUSEDEV_SCREEN_X 1024 |
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#endif |
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#ifndef CONFIG_INPUT_MOUSEDEV_SCREEN_Y |
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#define CONFIG_INPUT_MOUSEDEV_SCREEN_Y 768 |
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#endif |
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static int xres = CONFIG_INPUT_MOUSEDEV_SCREEN_X; |
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module_param(xres, uint, 0644); |
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MODULE_PARM_DESC(xres, "Horizontal screen resolution"); |
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static int yres = CONFIG_INPUT_MOUSEDEV_SCREEN_Y; |
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module_param(yres, uint, 0644); |
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MODULE_PARM_DESC(yres, "Vertical screen resolution"); |
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|
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static unsigned tap_time = 200; |
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module_param(tap_time, uint, 0644); |
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MODULE_PARM_DESC(tap_time, "Tap time for touchpads in absolute mode (msecs)"); |
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struct mousedev_hw_data { |
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int dx, dy, dz; |
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int x, y; |
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int abs_event; |
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unsigned long buttons; |
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}; |
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struct mousedev { |
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int open; |
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struct input_handle handle; |
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wait_queue_head_t wait; |
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struct list_head client_list; |
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spinlock_t client_lock; /* protects client_list */ |
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struct mutex mutex; |
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struct device dev; |
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struct cdev cdev; |
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bool exist; |
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struct list_head mixdev_node; |
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bool opened_by_mixdev; |
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struct mousedev_hw_data packet; |
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unsigned int pkt_count; |
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int old_x[4], old_y[4]; |
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int frac_dx, frac_dy; |
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unsigned long touch; |
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int (*open_device)(struct mousedev *mousedev); |
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void (*close_device)(struct mousedev *mousedev); |
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}; |
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enum mousedev_emul { |
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MOUSEDEV_EMUL_PS2, |
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MOUSEDEV_EMUL_IMPS, |
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MOUSEDEV_EMUL_EXPS |
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}; |
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struct mousedev_motion { |
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int dx, dy, dz; |
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unsigned long buttons; |
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}; |
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#define PACKET_QUEUE_LEN 16 |
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struct mousedev_client { |
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struct fasync_struct *fasync; |
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struct mousedev *mousedev; |
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struct list_head node; |
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struct mousedev_motion packets[PACKET_QUEUE_LEN]; |
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unsigned int head, tail; |
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spinlock_t packet_lock; |
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int pos_x, pos_y; |
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u8 ps2[6]; |
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unsigned char ready, buffer, bufsiz; |
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unsigned char imexseq, impsseq; |
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enum mousedev_emul mode; |
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unsigned long last_buttons; |
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}; |
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#define MOUSEDEV_SEQ_LEN 6 |
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static unsigned char mousedev_imps_seq[] = { 0xf3, 200, 0xf3, 100, 0xf3, 80 }; |
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static unsigned char mousedev_imex_seq[] = { 0xf3, 200, 0xf3, 200, 0xf3, 80 }; |
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static struct mousedev *mousedev_mix; |
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static LIST_HEAD(mousedev_mix_list); |
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#define fx(i) (mousedev->old_x[(mousedev->pkt_count - (i)) & 03]) |
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#define fy(i) (mousedev->old_y[(mousedev->pkt_count - (i)) & 03]) |
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static void mousedev_touchpad_event(struct input_dev *dev, |
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struct mousedev *mousedev, |
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unsigned int code, int value) |
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{ |
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int size, tmp; |
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enum { FRACTION_DENOM = 128 }; |
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switch (code) { |
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case ABS_X: |
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fx(0) = value; |
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if (mousedev->touch && mousedev->pkt_count >= 2) { |
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size = input_abs_get_max(dev, ABS_X) - |
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input_abs_get_min(dev, ABS_X); |
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if (size == 0) |
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size = 256 * 2; |
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tmp = ((value - fx(2)) * 256 * FRACTION_DENOM) / size; |
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tmp += mousedev->frac_dx; |
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mousedev->packet.dx = tmp / FRACTION_DENOM; |
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mousedev->frac_dx = |
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tmp - mousedev->packet.dx * FRACTION_DENOM; |
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} |
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break; |
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case ABS_Y: |
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fy(0) = value; |
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if (mousedev->touch && mousedev->pkt_count >= 2) { |
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/* use X size for ABS_Y to keep the same scale */ |
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size = input_abs_get_max(dev, ABS_X) - |
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input_abs_get_min(dev, ABS_X); |
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if (size == 0) |
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size = 256 * 2; |
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tmp = -((value - fy(2)) * 256 * FRACTION_DENOM) / size; |
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tmp += mousedev->frac_dy; |
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mousedev->packet.dy = tmp / FRACTION_DENOM; |
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mousedev->frac_dy = tmp - |
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mousedev->packet.dy * FRACTION_DENOM; |
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} |
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break; |
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} |
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} |
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static void mousedev_abs_event(struct input_dev *dev, struct mousedev *mousedev, |
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unsigned int code, int value) |
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{ |
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int min, max, size; |
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switch (code) { |
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case ABS_X: |
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min = input_abs_get_min(dev, ABS_X); |
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max = input_abs_get_max(dev, ABS_X); |
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size = max - min; |
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if (size == 0) |
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size = xres ? : 1; |
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value = clamp(value, min, max); |
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mousedev->packet.x = ((value - min) * xres) / size; |
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mousedev->packet.abs_event = 1; |
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break; |
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case ABS_Y: |
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min = input_abs_get_min(dev, ABS_Y); |
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max = input_abs_get_max(dev, ABS_Y); |
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size = max - min; |
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if (size == 0) |
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size = yres ? : 1; |
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value = clamp(value, min, max); |
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mousedev->packet.y = yres - ((value - min) * yres) / size; |
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mousedev->packet.abs_event = 1; |
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break; |
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} |
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} |
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static void mousedev_rel_event(struct mousedev *mousedev, |
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unsigned int code, int value) |
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{ |
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switch (code) { |
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case REL_X: |
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mousedev->packet.dx += value; |
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break; |
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case REL_Y: |
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mousedev->packet.dy -= value; |
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break; |
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case REL_WHEEL: |
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mousedev->packet.dz -= value; |
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break; |
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} |
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} |
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static void mousedev_key_event(struct mousedev *mousedev, |
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unsigned int code, int value) |
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{ |
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int index; |
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switch (code) { |
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case BTN_TOUCH: |
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case BTN_0: |
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case BTN_LEFT: index = 0; break; |
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case BTN_STYLUS: |
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case BTN_1: |
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case BTN_RIGHT: index = 1; break; |
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case BTN_2: |
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case BTN_FORWARD: |
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case BTN_STYLUS2: |
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case BTN_MIDDLE: index = 2; break; |
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case BTN_3: |
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case BTN_BACK: |
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case BTN_SIDE: index = 3; break; |
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case BTN_4: |
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case BTN_EXTRA: index = 4; break; |
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default: return; |
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} |
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if (value) { |
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set_bit(index, &mousedev->packet.buttons); |
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set_bit(index, &mousedev_mix->packet.buttons); |
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} else { |
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clear_bit(index, &mousedev->packet.buttons); |
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clear_bit(index, &mousedev_mix->packet.buttons); |
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} |
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} |
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static void mousedev_notify_readers(struct mousedev *mousedev, |
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struct mousedev_hw_data *packet) |
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{ |
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struct mousedev_client *client; |
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struct mousedev_motion *p; |
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unsigned int new_head; |
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int wake_readers = 0; |
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rcu_read_lock(); |
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list_for_each_entry_rcu(client, &mousedev->client_list, node) { |
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/* Just acquire the lock, interrupts already disabled */ |
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spin_lock(&client->packet_lock); |
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p = &client->packets[client->head]; |
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if (client->ready && p->buttons != mousedev->packet.buttons) { |
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new_head = (client->head + 1) % PACKET_QUEUE_LEN; |
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if (new_head != client->tail) { |
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p = &client->packets[client->head = new_head]; |
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memset(p, 0, sizeof(struct mousedev_motion)); |
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} |
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} |
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if (packet->abs_event) { |
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p->dx += packet->x - client->pos_x; |
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p->dy += packet->y - client->pos_y; |
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client->pos_x = packet->x; |
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client->pos_y = packet->y; |
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} |
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client->pos_x += packet->dx; |
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client->pos_x = clamp_val(client->pos_x, 0, xres); |
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client->pos_y += packet->dy; |
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client->pos_y = clamp_val(client->pos_y, 0, yres); |
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p->dx += packet->dx; |
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p->dy += packet->dy; |
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p->dz += packet->dz; |
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p->buttons = mousedev->packet.buttons; |
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if (p->dx || p->dy || p->dz || |
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p->buttons != client->last_buttons) |
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client->ready = 1; |
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spin_unlock(&client->packet_lock); |
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if (client->ready) { |
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kill_fasync(&client->fasync, SIGIO, POLL_IN); |
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wake_readers = 1; |
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} |
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} |
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rcu_read_unlock(); |
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if (wake_readers) |
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wake_up_interruptible(&mousedev->wait); |
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} |
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static void mousedev_touchpad_touch(struct mousedev *mousedev, int value) |
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{ |
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if (!value) { |
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if (mousedev->touch && |
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time_before(jiffies, |
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mousedev->touch + msecs_to_jiffies(tap_time))) { |
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/* |
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* Toggle left button to emulate tap. |
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* We rely on the fact that mousedev_mix always has 0 |
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* motion packet so we won't mess current position. |
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*/ |
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set_bit(0, &mousedev->packet.buttons); |
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set_bit(0, &mousedev_mix->packet.buttons); |
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mousedev_notify_readers(mousedev, &mousedev_mix->packet); |
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mousedev_notify_readers(mousedev_mix, |
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&mousedev_mix->packet); |
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clear_bit(0, &mousedev->packet.buttons); |
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clear_bit(0, &mousedev_mix->packet.buttons); |
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} |
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mousedev->touch = mousedev->pkt_count = 0; |
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mousedev->frac_dx = 0; |
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mousedev->frac_dy = 0; |
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} else if (!mousedev->touch) |
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mousedev->touch = jiffies; |
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} |
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static void mousedev_event(struct input_handle *handle, |
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unsigned int type, unsigned int code, int value) |
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{ |
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struct mousedev *mousedev = handle->private; |
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switch (type) { |
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case EV_ABS: |
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/* Ignore joysticks */ |
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if (test_bit(BTN_TRIGGER, handle->dev->keybit)) |
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return; |
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if (test_bit(BTN_TOOL_FINGER, handle->dev->keybit)) |
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mousedev_touchpad_event(handle->dev, |
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mousedev, code, value); |
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else |
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mousedev_abs_event(handle->dev, mousedev, code, value); |
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break; |
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case EV_REL: |
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mousedev_rel_event(mousedev, code, value); |
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break; |
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case EV_KEY: |
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if (value != 2) { |
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if (code == BTN_TOUCH && |
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test_bit(BTN_TOOL_FINGER, handle->dev->keybit)) |
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mousedev_touchpad_touch(mousedev, value); |
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else |
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mousedev_key_event(mousedev, code, value); |
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} |
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break; |
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case EV_SYN: |
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if (code == SYN_REPORT) { |
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if (mousedev->touch) { |
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mousedev->pkt_count++; |
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/* |
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* Input system eats duplicate events, |
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* but we need all of them to do correct |
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* averaging so apply present one forward |
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*/ |
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fx(0) = fx(1); |
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fy(0) = fy(1); |
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} |
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mousedev_notify_readers(mousedev, &mousedev->packet); |
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mousedev_notify_readers(mousedev_mix, &mousedev->packet); |
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mousedev->packet.dx = mousedev->packet.dy = |
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mousedev->packet.dz = 0; |
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mousedev->packet.abs_event = 0; |
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} |
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break; |
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} |
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} |
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static int mousedev_fasync(int fd, struct file *file, int on) |
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{ |
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struct mousedev_client *client = file->private_data; |
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return fasync_helper(fd, file, on, &client->fasync); |
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} |
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static void mousedev_free(struct device *dev) |
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{ |
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struct mousedev *mousedev = container_of(dev, struct mousedev, dev); |
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input_put_device(mousedev->handle.dev); |
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kfree(mousedev); |
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} |
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static int mousedev_open_device(struct mousedev *mousedev) |
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{ |
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int retval; |
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retval = mutex_lock_interruptible(&mousedev->mutex); |
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if (retval) |
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return retval; |
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if (!mousedev->exist) |
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retval = -ENODEV; |
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else if (!mousedev->open++) { |
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retval = input_open_device(&mousedev->handle); |
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if (retval) |
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mousedev->open--; |
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} |
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mutex_unlock(&mousedev->mutex); |
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return retval; |
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} |
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static void mousedev_close_device(struct mousedev *mousedev) |
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{ |
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mutex_lock(&mousedev->mutex); |
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if (mousedev->exist && !--mousedev->open) |
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input_close_device(&mousedev->handle); |
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mutex_unlock(&mousedev->mutex); |
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} |
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/* |
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* Open all available devices so they can all be multiplexed in one. |
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* stream. Note that this function is called with mousedev_mix->mutex |
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* held. |
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*/ |
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static int mixdev_open_devices(struct mousedev *mixdev) |
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{ |
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int error; |
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error = mutex_lock_interruptible(&mixdev->mutex); |
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if (error) |
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return error; |
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if (!mixdev->open++) { |
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struct mousedev *mousedev; |
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list_for_each_entry(mousedev, &mousedev_mix_list, mixdev_node) { |
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if (!mousedev->opened_by_mixdev) { |
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if (mousedev_open_device(mousedev)) |
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continue; |
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mousedev->opened_by_mixdev = true; |
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} |
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} |
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} |
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mutex_unlock(&mixdev->mutex); |
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return 0; |
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} |
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/* |
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* Close all devices that were opened as part of multiplexed |
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* device. Note that this function is called with mousedev_mix->mutex |
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* held. |
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*/ |
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static void mixdev_close_devices(struct mousedev *mixdev) |
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{ |
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mutex_lock(&mixdev->mutex); |
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|
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if (!--mixdev->open) { |
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struct mousedev *mousedev; |
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list_for_each_entry(mousedev, &mousedev_mix_list, mixdev_node) { |
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if (mousedev->opened_by_mixdev) { |
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mousedev->opened_by_mixdev = false; |
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mousedev_close_device(mousedev); |
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} |
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} |
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} |
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|
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mutex_unlock(&mixdev->mutex); |
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} |
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static void mousedev_attach_client(struct mousedev *mousedev, |
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struct mousedev_client *client) |
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{ |
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spin_lock(&mousedev->client_lock); |
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list_add_tail_rcu(&client->node, &mousedev->client_list); |
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spin_unlock(&mousedev->client_lock); |
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} |
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|
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static void mousedev_detach_client(struct mousedev *mousedev, |
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struct mousedev_client *client) |
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{ |
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spin_lock(&mousedev->client_lock); |
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list_del_rcu(&client->node); |
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spin_unlock(&mousedev->client_lock); |
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synchronize_rcu(); |
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} |
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|
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static int mousedev_release(struct inode *inode, struct file *file) |
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{ |
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struct mousedev_client *client = file->private_data; |
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struct mousedev *mousedev = client->mousedev; |
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|
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mousedev_detach_client(mousedev, client); |
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kfree(client); |
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|
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mousedev->close_device(mousedev); |
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|
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return 0; |
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} |
|
|
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static int mousedev_open(struct inode *inode, struct file *file) |
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{ |
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struct mousedev_client *client; |
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struct mousedev *mousedev; |
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int error; |
|
|
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#ifdef CONFIG_INPUT_MOUSEDEV_PSAUX |
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if (imajor(inode) == MISC_MAJOR) |
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mousedev = mousedev_mix; |
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else |
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#endif |
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mousedev = container_of(inode->i_cdev, struct mousedev, cdev); |
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|
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client = kzalloc(sizeof(struct mousedev_client), GFP_KERNEL); |
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if (!client) |
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return -ENOMEM; |
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|
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spin_lock_init(&client->packet_lock); |
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client->pos_x = xres / 2; |
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client->pos_y = yres / 2; |
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client->mousedev = mousedev; |
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mousedev_attach_client(mousedev, client); |
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|
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error = mousedev->open_device(mousedev); |
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if (error) |
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goto err_free_client; |
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|
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file->private_data = client; |
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stream_open(inode, file); |
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|
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return 0; |
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|
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err_free_client: |
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mousedev_detach_client(mousedev, client); |
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kfree(client); |
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return error; |
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} |
|
|
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static void mousedev_packet(struct mousedev_client *client, u8 *ps2_data) |
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{ |
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struct mousedev_motion *p = &client->packets[client->tail]; |
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s8 dx, dy, dz; |
|
|
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dx = clamp_val(p->dx, -127, 127); |
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p->dx -= dx; |
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|
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dy = clamp_val(p->dy, -127, 127); |
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p->dy -= dy; |
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|
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ps2_data[0] = BIT(3); |
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ps2_data[0] |= ((dx & BIT(7)) >> 3) | ((dy & BIT(7)) >> 2); |
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ps2_data[0] |= p->buttons & 0x07; |
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ps2_data[1] = dx; |
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ps2_data[2] = dy; |
|
|
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switch (client->mode) { |
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case MOUSEDEV_EMUL_EXPS: |
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dz = clamp_val(p->dz, -7, 7); |
|
p->dz -= dz; |
|
|
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ps2_data[3] = (dz & 0x0f) | ((p->buttons & 0x18) << 1); |
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client->bufsiz = 4; |
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break; |
|
|
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case MOUSEDEV_EMUL_IMPS: |
|
dz = clamp_val(p->dz, -127, 127); |
|
p->dz -= dz; |
|
|
|
ps2_data[0] |= ((p->buttons & 0x10) >> 3) | |
|
((p->buttons & 0x08) >> 1); |
|
ps2_data[3] = dz; |
|
|
|
client->bufsiz = 4; |
|
break; |
|
|
|
case MOUSEDEV_EMUL_PS2: |
|
default: |
|
p->dz = 0; |
|
|
|
ps2_data[0] |= ((p->buttons & 0x10) >> 3) | |
|
((p->buttons & 0x08) >> 1); |
|
|
|
client->bufsiz = 3; |
|
break; |
|
} |
|
|
|
if (!p->dx && !p->dy && !p->dz) { |
|
if (client->tail == client->head) { |
|
client->ready = 0; |
|
client->last_buttons = p->buttons; |
|
} else |
|
client->tail = (client->tail + 1) % PACKET_QUEUE_LEN; |
|
} |
|
} |
|
|
|
static void mousedev_generate_response(struct mousedev_client *client, |
|
int command) |
|
{ |
|
client->ps2[0] = 0xfa; /* ACK */ |
|
|
|
switch (command) { |
|
|
|
case 0xeb: /* Poll */ |
|
mousedev_packet(client, &client->ps2[1]); |
|
client->bufsiz++; /* account for leading ACK */ |
|
break; |
|
|
|
case 0xf2: /* Get ID */ |
|
switch (client->mode) { |
|
case MOUSEDEV_EMUL_PS2: |
|
client->ps2[1] = 0; |
|
break; |
|
case MOUSEDEV_EMUL_IMPS: |
|
client->ps2[1] = 3; |
|
break; |
|
case MOUSEDEV_EMUL_EXPS: |
|
client->ps2[1] = 4; |
|
break; |
|
} |
|
client->bufsiz = 2; |
|
break; |
|
|
|
case 0xe9: /* Get info */ |
|
client->ps2[1] = 0x60; client->ps2[2] = 3; client->ps2[3] = 200; |
|
client->bufsiz = 4; |
|
break; |
|
|
|
case 0xff: /* Reset */ |
|
client->impsseq = client->imexseq = 0; |
|
client->mode = MOUSEDEV_EMUL_PS2; |
|
client->ps2[1] = 0xaa; client->ps2[2] = 0x00; |
|
client->bufsiz = 3; |
|
break; |
|
|
|
default: |
|
client->bufsiz = 1; |
|
break; |
|
} |
|
client->buffer = client->bufsiz; |
|
} |
|
|
|
static ssize_t mousedev_write(struct file *file, const char __user *buffer, |
|
size_t count, loff_t *ppos) |
|
{ |
|
struct mousedev_client *client = file->private_data; |
|
unsigned char c; |
|
unsigned int i; |
|
|
|
for (i = 0; i < count; i++) { |
|
|
|
if (get_user(c, buffer + i)) |
|
return -EFAULT; |
|
|
|
spin_lock_irq(&client->packet_lock); |
|
|
|
if (c == mousedev_imex_seq[client->imexseq]) { |
|
if (++client->imexseq == MOUSEDEV_SEQ_LEN) { |
|
client->imexseq = 0; |
|
client->mode = MOUSEDEV_EMUL_EXPS; |
|
} |
|
} else |
|
client->imexseq = 0; |
|
|
|
if (c == mousedev_imps_seq[client->impsseq]) { |
|
if (++client->impsseq == MOUSEDEV_SEQ_LEN) { |
|
client->impsseq = 0; |
|
client->mode = MOUSEDEV_EMUL_IMPS; |
|
} |
|
} else |
|
client->impsseq = 0; |
|
|
|
mousedev_generate_response(client, c); |
|
|
|
spin_unlock_irq(&client->packet_lock); |
|
cond_resched(); |
|
} |
|
|
|
kill_fasync(&client->fasync, SIGIO, POLL_IN); |
|
wake_up_interruptible(&client->mousedev->wait); |
|
|
|
return count; |
|
} |
|
|
|
static ssize_t mousedev_read(struct file *file, char __user *buffer, |
|
size_t count, loff_t *ppos) |
|
{ |
|
struct mousedev_client *client = file->private_data; |
|
struct mousedev *mousedev = client->mousedev; |
|
u8 data[sizeof(client->ps2)]; |
|
int retval = 0; |
|
|
|
if (!client->ready && !client->buffer && mousedev->exist && |
|
(file->f_flags & O_NONBLOCK)) |
|
return -EAGAIN; |
|
|
|
retval = wait_event_interruptible(mousedev->wait, |
|
!mousedev->exist || client->ready || client->buffer); |
|
if (retval) |
|
return retval; |
|
|
|
if (!mousedev->exist) |
|
return -ENODEV; |
|
|
|
spin_lock_irq(&client->packet_lock); |
|
|
|
if (!client->buffer && client->ready) { |
|
mousedev_packet(client, client->ps2); |
|
client->buffer = client->bufsiz; |
|
} |
|
|
|
if (count > client->buffer) |
|
count = client->buffer; |
|
|
|
memcpy(data, client->ps2 + client->bufsiz - client->buffer, count); |
|
client->buffer -= count; |
|
|
|
spin_unlock_irq(&client->packet_lock); |
|
|
|
if (copy_to_user(buffer, data, count)) |
|
return -EFAULT; |
|
|
|
return count; |
|
} |
|
|
|
/* No kernel lock - fine */ |
|
static __poll_t mousedev_poll(struct file *file, poll_table *wait) |
|
{ |
|
struct mousedev_client *client = file->private_data; |
|
struct mousedev *mousedev = client->mousedev; |
|
__poll_t mask; |
|
|
|
poll_wait(file, &mousedev->wait, wait); |
|
|
|
mask = mousedev->exist ? EPOLLOUT | EPOLLWRNORM : EPOLLHUP | EPOLLERR; |
|
if (client->ready || client->buffer) |
|
mask |= EPOLLIN | EPOLLRDNORM; |
|
|
|
return mask; |
|
} |
|
|
|
static const struct file_operations mousedev_fops = { |
|
.owner = THIS_MODULE, |
|
.read = mousedev_read, |
|
.write = mousedev_write, |
|
.poll = mousedev_poll, |
|
.open = mousedev_open, |
|
.release = mousedev_release, |
|
.fasync = mousedev_fasync, |
|
.llseek = noop_llseek, |
|
}; |
|
|
|
/* |
|
* Mark device non-existent. This disables writes, ioctls and |
|
* prevents new users from opening the device. Already posted |
|
* blocking reads will stay, however new ones will fail. |
|
*/ |
|
static void mousedev_mark_dead(struct mousedev *mousedev) |
|
{ |
|
mutex_lock(&mousedev->mutex); |
|
mousedev->exist = false; |
|
mutex_unlock(&mousedev->mutex); |
|
} |
|
|
|
/* |
|
* Wake up users waiting for IO so they can disconnect from |
|
* dead device. |
|
*/ |
|
static void mousedev_hangup(struct mousedev *mousedev) |
|
{ |
|
struct mousedev_client *client; |
|
|
|
spin_lock(&mousedev->client_lock); |
|
list_for_each_entry(client, &mousedev->client_list, node) |
|
kill_fasync(&client->fasync, SIGIO, POLL_HUP); |
|
spin_unlock(&mousedev->client_lock); |
|
|
|
wake_up_interruptible(&mousedev->wait); |
|
} |
|
|
|
static void mousedev_cleanup(struct mousedev *mousedev) |
|
{ |
|
struct input_handle *handle = &mousedev->handle; |
|
|
|
mousedev_mark_dead(mousedev); |
|
mousedev_hangup(mousedev); |
|
|
|
/* mousedev is marked dead so no one else accesses mousedev->open */ |
|
if (mousedev->open) |
|
input_close_device(handle); |
|
} |
|
|
|
static int mousedev_reserve_minor(bool mixdev) |
|
{ |
|
int minor; |
|
|
|
if (mixdev) { |
|
minor = input_get_new_minor(MOUSEDEV_MIX, 1, false); |
|
if (minor < 0) |
|
pr_err("failed to reserve mixdev minor: %d\n", minor); |
|
} else { |
|
minor = input_get_new_minor(MOUSEDEV_MINOR_BASE, |
|
MOUSEDEV_MINORS, true); |
|
if (minor < 0) |
|
pr_err("failed to reserve new minor: %d\n", minor); |
|
} |
|
|
|
return minor; |
|
} |
|
|
|
static struct mousedev *mousedev_create(struct input_dev *dev, |
|
struct input_handler *handler, |
|
bool mixdev) |
|
{ |
|
struct mousedev *mousedev; |
|
int minor; |
|
int error; |
|
|
|
minor = mousedev_reserve_minor(mixdev); |
|
if (minor < 0) { |
|
error = minor; |
|
goto err_out; |
|
} |
|
|
|
mousedev = kzalloc(sizeof(struct mousedev), GFP_KERNEL); |
|
if (!mousedev) { |
|
error = -ENOMEM; |
|
goto err_free_minor; |
|
} |
|
|
|
INIT_LIST_HEAD(&mousedev->client_list); |
|
INIT_LIST_HEAD(&mousedev->mixdev_node); |
|
spin_lock_init(&mousedev->client_lock); |
|
mutex_init(&mousedev->mutex); |
|
lockdep_set_subclass(&mousedev->mutex, |
|
mixdev ? SINGLE_DEPTH_NESTING : 0); |
|
init_waitqueue_head(&mousedev->wait); |
|
|
|
if (mixdev) { |
|
dev_set_name(&mousedev->dev, "mice"); |
|
|
|
mousedev->open_device = mixdev_open_devices; |
|
mousedev->close_device = mixdev_close_devices; |
|
} else { |
|
int dev_no = minor; |
|
/* Normalize device number if it falls into legacy range */ |
|
if (dev_no < MOUSEDEV_MINOR_BASE + MOUSEDEV_MINORS) |
|
dev_no -= MOUSEDEV_MINOR_BASE; |
|
dev_set_name(&mousedev->dev, "mouse%d", dev_no); |
|
|
|
mousedev->open_device = mousedev_open_device; |
|
mousedev->close_device = mousedev_close_device; |
|
} |
|
|
|
mousedev->exist = true; |
|
mousedev->handle.dev = input_get_device(dev); |
|
mousedev->handle.name = dev_name(&mousedev->dev); |
|
mousedev->handle.handler = handler; |
|
mousedev->handle.private = mousedev; |
|
|
|
mousedev->dev.class = &input_class; |
|
if (dev) |
|
mousedev->dev.parent = &dev->dev; |
|
mousedev->dev.devt = MKDEV(INPUT_MAJOR, minor); |
|
mousedev->dev.release = mousedev_free; |
|
device_initialize(&mousedev->dev); |
|
|
|
if (!mixdev) { |
|
error = input_register_handle(&mousedev->handle); |
|
if (error) |
|
goto err_free_mousedev; |
|
} |
|
|
|
cdev_init(&mousedev->cdev, &mousedev_fops); |
|
|
|
error = cdev_device_add(&mousedev->cdev, &mousedev->dev); |
|
if (error) |
|
goto err_cleanup_mousedev; |
|
|
|
return mousedev; |
|
|
|
err_cleanup_mousedev: |
|
mousedev_cleanup(mousedev); |
|
if (!mixdev) |
|
input_unregister_handle(&mousedev->handle); |
|
err_free_mousedev: |
|
put_device(&mousedev->dev); |
|
err_free_minor: |
|
input_free_minor(minor); |
|
err_out: |
|
return ERR_PTR(error); |
|
} |
|
|
|
static void mousedev_destroy(struct mousedev *mousedev) |
|
{ |
|
cdev_device_del(&mousedev->cdev, &mousedev->dev); |
|
mousedev_cleanup(mousedev); |
|
input_free_minor(MINOR(mousedev->dev.devt)); |
|
if (mousedev != mousedev_mix) |
|
input_unregister_handle(&mousedev->handle); |
|
put_device(&mousedev->dev); |
|
} |
|
|
|
static int mixdev_add_device(struct mousedev *mousedev) |
|
{ |
|
int retval; |
|
|
|
retval = mutex_lock_interruptible(&mousedev_mix->mutex); |
|
if (retval) |
|
return retval; |
|
|
|
if (mousedev_mix->open) { |
|
retval = mousedev_open_device(mousedev); |
|
if (retval) |
|
goto out; |
|
|
|
mousedev->opened_by_mixdev = true; |
|
} |
|
|
|
get_device(&mousedev->dev); |
|
list_add_tail(&mousedev->mixdev_node, &mousedev_mix_list); |
|
|
|
out: |
|
mutex_unlock(&mousedev_mix->mutex); |
|
return retval; |
|
} |
|
|
|
static void mixdev_remove_device(struct mousedev *mousedev) |
|
{ |
|
mutex_lock(&mousedev_mix->mutex); |
|
|
|
if (mousedev->opened_by_mixdev) { |
|
mousedev->opened_by_mixdev = false; |
|
mousedev_close_device(mousedev); |
|
} |
|
|
|
list_del_init(&mousedev->mixdev_node); |
|
mutex_unlock(&mousedev_mix->mutex); |
|
|
|
put_device(&mousedev->dev); |
|
} |
|
|
|
static int mousedev_connect(struct input_handler *handler, |
|
struct input_dev *dev, |
|
const struct input_device_id *id) |
|
{ |
|
struct mousedev *mousedev; |
|
int error; |
|
|
|
mousedev = mousedev_create(dev, handler, false); |
|
if (IS_ERR(mousedev)) |
|
return PTR_ERR(mousedev); |
|
|
|
error = mixdev_add_device(mousedev); |
|
if (error) { |
|
mousedev_destroy(mousedev); |
|
return error; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static void mousedev_disconnect(struct input_handle *handle) |
|
{ |
|
struct mousedev *mousedev = handle->private; |
|
|
|
mixdev_remove_device(mousedev); |
|
mousedev_destroy(mousedev); |
|
} |
|
|
|
static const struct input_device_id mousedev_ids[] = { |
|
{ |
|
.flags = INPUT_DEVICE_ID_MATCH_EVBIT | |
|
INPUT_DEVICE_ID_MATCH_KEYBIT | |
|
INPUT_DEVICE_ID_MATCH_RELBIT, |
|
.evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_REL) }, |
|
.keybit = { [BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) }, |
|
.relbit = { BIT_MASK(REL_X) | BIT_MASK(REL_Y) }, |
|
}, /* A mouse like device, at least one button, |
|
two relative axes */ |
|
{ |
|
.flags = INPUT_DEVICE_ID_MATCH_EVBIT | |
|
INPUT_DEVICE_ID_MATCH_RELBIT, |
|
.evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_REL) }, |
|
.relbit = { BIT_MASK(REL_WHEEL) }, |
|
}, /* A separate scrollwheel */ |
|
{ |
|
.flags = INPUT_DEVICE_ID_MATCH_EVBIT | |
|
INPUT_DEVICE_ID_MATCH_KEYBIT | |
|
INPUT_DEVICE_ID_MATCH_ABSBIT, |
|
.evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) }, |
|
.keybit = { [BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH) }, |
|
.absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) }, |
|
}, /* A tablet like device, at least touch detection, |
|
two absolute axes */ |
|
{ |
|
.flags = INPUT_DEVICE_ID_MATCH_EVBIT | |
|
INPUT_DEVICE_ID_MATCH_KEYBIT | |
|
INPUT_DEVICE_ID_MATCH_ABSBIT, |
|
.evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) }, |
|
.keybit = { [BIT_WORD(BTN_TOOL_FINGER)] = |
|
BIT_MASK(BTN_TOOL_FINGER) }, |
|
.absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) | |
|
BIT_MASK(ABS_PRESSURE) | |
|
BIT_MASK(ABS_TOOL_WIDTH) }, |
|
}, /* A touchpad */ |
|
{ |
|
.flags = INPUT_DEVICE_ID_MATCH_EVBIT | |
|
INPUT_DEVICE_ID_MATCH_KEYBIT | |
|
INPUT_DEVICE_ID_MATCH_ABSBIT, |
|
.evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) }, |
|
.keybit = { [BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) }, |
|
.absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) }, |
|
}, /* Mouse-like device with absolute X and Y but ordinary |
|
clicks, like hp ILO2 High Performance mouse */ |
|
|
|
{ }, /* Terminating entry */ |
|
}; |
|
|
|
MODULE_DEVICE_TABLE(input, mousedev_ids); |
|
|
|
static struct input_handler mousedev_handler = { |
|
.event = mousedev_event, |
|
.connect = mousedev_connect, |
|
.disconnect = mousedev_disconnect, |
|
.legacy_minors = true, |
|
.minor = MOUSEDEV_MINOR_BASE, |
|
.name = "mousedev", |
|
.id_table = mousedev_ids, |
|
}; |
|
|
|
#ifdef CONFIG_INPUT_MOUSEDEV_PSAUX |
|
#include <linux/miscdevice.h> |
|
|
|
static struct miscdevice psaux_mouse = { |
|
.minor = PSMOUSE_MINOR, |
|
.name = "psaux", |
|
.fops = &mousedev_fops, |
|
}; |
|
|
|
static bool psaux_registered; |
|
|
|
static void __init mousedev_psaux_register(void) |
|
{ |
|
int error; |
|
|
|
error = misc_register(&psaux_mouse); |
|
if (error) |
|
pr_warn("could not register psaux device, error: %d\n", |
|
error); |
|
else |
|
psaux_registered = true; |
|
} |
|
|
|
static void __exit mousedev_psaux_unregister(void) |
|
{ |
|
if (psaux_registered) |
|
misc_deregister(&psaux_mouse); |
|
} |
|
#else |
|
static inline void mousedev_psaux_register(void) { } |
|
static inline void mousedev_psaux_unregister(void) { } |
|
#endif |
|
|
|
static int __init mousedev_init(void) |
|
{ |
|
int error; |
|
|
|
mousedev_mix = mousedev_create(NULL, &mousedev_handler, true); |
|
if (IS_ERR(mousedev_mix)) |
|
return PTR_ERR(mousedev_mix); |
|
|
|
error = input_register_handler(&mousedev_handler); |
|
if (error) { |
|
mousedev_destroy(mousedev_mix); |
|
return error; |
|
} |
|
|
|
mousedev_psaux_register(); |
|
|
|
pr_info("PS/2 mouse device common for all mice\n"); |
|
|
|
return 0; |
|
} |
|
|
|
static void __exit mousedev_exit(void) |
|
{ |
|
mousedev_psaux_unregister(); |
|
input_unregister_handler(&mousedev_handler); |
|
mousedev_destroy(mousedev_mix); |
|
} |
|
|
|
module_init(mousedev_init); |
|
module_exit(mousedev_exit);
|
|
|