/* * Input driver to ExplorerPS/2 device driver module. * * Copyright (c) 1999-2002 Vojtech Pavlik * Copyright (c) 2004 Dmitry Torokhov * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as published by * the Free Software Foundation. */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #define MOUSEDEV_MINOR_BASE 32 #define MOUSEDEV_MINORS 32 #define MOUSEDEV_MIX 31 #include <linux/sched.h> #include <linux/slab.h> #include <linux/poll.h> #include <linux/module.h> #include <linux/init.h> #include <linux/input.h> #include <linux/random.h> #include <linux/major.h> #include <linux/device.h> #include <linux/kernel.h> #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX #include <linux/miscdevice.h> #endif MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); MODULE_DESCRIPTION("Mouse (ExplorerPS/2) device interfaces"); MODULE_LICENSE("GPL"); #ifndef CONFIG_INPUT_MOUSEDEV_SCREEN_X #define CONFIG_INPUT_MOUSEDEV_SCREEN_X 1024 #endif #ifndef CONFIG_INPUT_MOUSEDEV_SCREEN_Y #define CONFIG_INPUT_MOUSEDEV_SCREEN_Y 768 #endif static int xres = CONFIG_INPUT_MOUSEDEV_SCREEN_X; module_param(xres, uint, 0644); MODULE_PARM_DESC(xres, "Horizontal screen resolution"); static int yres = CONFIG_INPUT_MOUSEDEV_SCREEN_Y; module_param(yres, uint, 0644); MODULE_PARM_DESC(yres, "Vertical screen resolution"); static unsigned tap_time = 200; module_param(tap_time, uint, 0644); MODULE_PARM_DESC(tap_time, "Tap time for touchpads in absolute mode (msecs)"); struct mousedev_hw_data { int dx, dy, dz; int x, y; int abs_event; unsigned long buttons; }; struct mousedev { int open; int minor; struct input_handle handle; wait_queue_head_t wait; struct list_head client_list; spinlock_t client_lock; /* protects client_list */ struct mutex mutex; struct device dev; bool exist; struct list_head mixdev_node; int mixdev_open; struct mousedev_hw_data packet; unsigned int pkt_count; int old_x[4], old_y[4]; int frac_dx, frac_dy; unsigned long touch; }; enum mousedev_emul { MOUSEDEV_EMUL_PS2, MOUSEDEV_EMUL_IMPS, MOUSEDEV_EMUL_EXPS }; struct mousedev_motion { int dx, dy, dz; unsigned long buttons; }; #define PACKET_QUEUE_LEN 16 struct mousedev_client { struct fasync_struct *fasync; struct mousedev *mousedev; struct list_head node; struct mousedev_motion packets[PACKET_QUEUE_LEN]; unsigned int head, tail; spinlock_t packet_lock; int pos_x, pos_y; signed char ps2[6]; unsigned char ready, buffer, bufsiz; unsigned char imexseq, impsseq; enum mousedev_emul mode; unsigned long last_buttons; }; #define MOUSEDEV_SEQ_LEN 6 static unsigned char mousedev_imps_seq[] = { 0xf3, 200, 0xf3, 100, 0xf3, 80 }; static unsigned char mousedev_imex_seq[] = { 0xf3, 200, 0xf3, 200, 0xf3, 80 }; static struct input_handler mousedev_handler; static struct mousedev *mousedev_table[MOUSEDEV_MINORS]; static DEFINE_MUTEX(mousedev_table_mutex); static struct mousedev *mousedev_mix; static LIST_HEAD(mousedev_mix_list); static void mixdev_open_devices(void); static void mixdev_close_devices(void); #define fx(i) (mousedev->old_x[(mousedev->pkt_count - (i)) & 03]) #define fy(i) (mousedev->old_y[(mousedev->pkt_count - (i)) & 03]) static void mousedev_touchpad_event(struct input_dev *dev, struct mousedev *mousedev, unsigned int code, int value) { int size, tmp; enum { FRACTION_DENOM = 128 }; switch (code) { case ABS_X: fx(0) = value; if (mousedev->touch && mousedev->pkt_count >= 2) { size = input_abs_get_max(dev, ABS_X) - input_abs_get_min(dev, ABS_X); if (size == 0) size = 256 * 2; tmp = ((value - fx(2)) * 256 * FRACTION_DENOM) / size; tmp += mousedev->frac_dx; mousedev->packet.dx = tmp / FRACTION_DENOM; mousedev->frac_dx = tmp - mousedev->packet.dx * FRACTION_DENOM; } break; case ABS_Y: fy(0) = value; if (mousedev->touch && mousedev->pkt_count >= 2) { /* use X size for ABS_Y to keep the same scale */ size = input_abs_get_max(dev, ABS_X) - input_abs_get_min(dev, ABS_X); if (size == 0) size = 256 * 2; tmp = -((value - fy(2)) * 256 * FRACTION_DENOM) / size; tmp += mousedev->frac_dy; mousedev->packet.dy = tmp / FRACTION_DENOM; mousedev->frac_dy = tmp - mousedev->packet.dy * FRACTION_DENOM; } break; } } static void mousedev_abs_event(struct input_dev *dev, struct mousedev *mousedev, unsigned int code, int value) { int min, max, size; switch (code) { case ABS_X: min = input_abs_get_min(dev, ABS_X); max = input_abs_get_max(dev, ABS_X); size = max - min; if (size == 0) size = xres ? : 1; clamp(value, min, max); mousedev->packet.x = ((value - min) * xres) / size; mousedev->packet.abs_event = 1; break; case ABS_Y: min = input_abs_get_min(dev, ABS_Y); max = input_abs_get_max(dev, ABS_Y); size = max - min; if (size == 0) size = yres ? : 1; clamp(value, min, max); mousedev->packet.y = yres - ((value - min) * yres) / size; mousedev->packet.abs_event = 1; break; } } static void mousedev_rel_event(struct mousedev *mousedev, unsigned int code, int value) { switch (code) { case REL_X: mousedev->packet.dx += value; break; case REL_Y: mousedev->packet.dy -= value; break; case REL_WHEEL: mousedev->packet.dz -= value; break; } } static void mousedev_key_event(struct mousedev *mousedev, unsigned int code, int value) { int index; switch (code) { case BTN_TOUCH: case BTN_0: case BTN_LEFT: index = 0; break; case BTN_STYLUS: case BTN_1: case BTN_RIGHT: index = 1; break; case BTN_2: case BTN_FORWARD: case BTN_STYLUS2: case BTN_MIDDLE: index = 2; break; case BTN_3: case BTN_BACK: case BTN_SIDE: index = 3; break; case BTN_4: case BTN_EXTRA: index = 4; break; default: return; } if (value) { set_bit(index, &mousedev->packet.buttons); set_bit(index, &mousedev_mix->packet.buttons); } else { clear_bit(index, &mousedev->packet.buttons); clear_bit(index, &mousedev_mix->packet.buttons); } } static void mousedev_notify_readers(struct mousedev *mousedev, struct mousedev_hw_data *packet) { struct mousedev_client *client; struct mousedev_motion *p; unsigned int new_head; int wake_readers = 0; rcu_read_lock(); list_for_each_entry_rcu(client, &mousedev->client_list, node) { /* Just acquire the lock, interrupts already disabled */ spin_lock(&client->packet_lock); p = &client->packets[client->head]; if (client->ready && p->buttons != mousedev->packet.buttons) { new_head = (client->head + 1) % PACKET_QUEUE_LEN; if (new_head != client->tail) { p = &client->packets[client->head = new_head]; memset(p, 0, sizeof(struct mousedev_motion)); } } if (packet->abs_event) { p->dx += packet->x - client->pos_x; p->dy += packet->y - client->pos_y; client->pos_x = packet->x; client->pos_y = packet->y; } client->pos_x += packet->dx; client->pos_x = client->pos_x < 0 ? 0 : (client->pos_x >= xres ? xres : client->pos_x); client->pos_y += packet->dy; client->pos_y = client->pos_y < 0 ? 0 : (client->pos_y >= yres ? yres : client->pos_y); p->dx += packet->dx; p->dy += packet->dy; p->dz += packet->dz; p->buttons = mousedev->packet.buttons; if (p->dx || p->dy || p->dz || p->buttons != client->last_buttons) client->ready = 1; spin_unlock(&client->packet_lock); if (client->ready) { kill_fasync(&client->fasync, SIGIO, POLL_IN); wake_readers = 1; } } rcu_read_unlock(); if (wake_readers) wake_up_interruptible(&mousedev->wait); } static void mousedev_touchpad_touch(struct mousedev *mousedev, int value) { if (!value) { if (mousedev->touch && time_before(jiffies, mousedev->touch + msecs_to_jiffies(tap_time))) { /* * Toggle left button to emulate tap. * We rely on the fact that mousedev_mix always has 0 * motion packet so we won't mess current position. */ set_bit(0, &mousedev->packet.buttons); set_bit(0, &mousedev_mix->packet.buttons); mousedev_notify_readers(mousedev, &mousedev_mix->packet); mousedev_notify_readers(mousedev_mix, &mousedev_mix->packet); clear_bit(0, &mousedev->packet.buttons); clear_bit(0, &mousedev_mix->packet.buttons); } mousedev->touch = mousedev->pkt_count = 0; mousedev->frac_dx = 0; mousedev->frac_dy = 0; } else if (!mousedev->touch) mousedev->touch = jiffies; } static void mousedev_event(struct input_handle *handle, unsigned int type, unsigned int code, int value) { struct mousedev *mousedev = handle->private; switch (type) { case EV_ABS: /* Ignore joysticks */ if (test_bit(BTN_TRIGGER, handle->dev->keybit)) return; if (test_bit(BTN_TOOL_FINGER, handle->dev->keybit)) mousedev_touchpad_event(handle->dev, mousedev, code, value); else mousedev_abs_event(handle->dev, mousedev, code, value); break; case EV_REL: mousedev_rel_event(mousedev, code, value); break; case EV_KEY: if (value != 2) { if (code == BTN_TOUCH && test_bit(BTN_TOOL_FINGER, handle->dev->keybit)) mousedev_touchpad_touch(mousedev, value); else mousedev_key_event(mousedev, code, value); } break; case EV_SYN: if (code == SYN_REPORT) { if (mousedev->touch) { mousedev->pkt_count++; /* * Input system eats duplicate events, * but we need all of them to do correct * averaging so apply present one forward */ fx(0) = fx(1); fy(0) = fy(1); } mousedev_notify_readers(mousedev, &mousedev->packet); mousedev_notify_readers(mousedev_mix, &mousedev->packet); mousedev->packet.dx = mousedev->packet.dy = mousedev->packet.dz = 0; mousedev->packet.abs_event = 0; } break; } } static int mousedev_fasync(int fd, struct file *file, int on) { struct mousedev_client *client = file->private_data; return fasync_helper(fd, file, on, &client->fasync); } static void mousedev_free(struct device *dev) { struct mousedev *mousedev = container_of(dev, struct mousedev, dev); input_put_device(mousedev->handle.dev); kfree(mousedev); } static int mousedev_open_device(struct mousedev *mousedev) { int retval; retval = mutex_lock_interruptible(&mousedev->mutex); if (retval) return retval; if (mousedev->minor == MOUSEDEV_MIX) mixdev_open_devices(); else if (!mousedev->exist) retval = -ENODEV; else if (!mousedev->open++) { retval = input_open_device(&mousedev->handle); if (retval) mousedev->open--; } mutex_unlock(&mousedev->mutex); return retval; } static void mousedev_close_device(struct mousedev *mousedev) { mutex_lock(&mousedev->mutex); if (mousedev->minor == MOUSEDEV_MIX) mixdev_close_devices(); else if (mousedev->exist && !--mousedev->open) input_close_device(&mousedev->handle); mutex_unlock(&mousedev->mutex); } /* * Open all available devices so they can all be multiplexed in one. * stream. Note that this function is called with mousedev_mix->mutex * held. */ static void mixdev_open_devices(void) { struct mousedev *mousedev; if (mousedev_mix->open++) return; list_for_each_entry(mousedev, &mousedev_mix_list, mixdev_node) { if (!mousedev->mixdev_open) { if (mousedev_open_device(mousedev)) continue; mousedev->mixdev_open = 1; } } } /* * Close all devices that were opened as part of multiplexed * device. Note that this function is called with mousedev_mix->mutex * held. */ static void mixdev_close_devices(void) { struct mousedev *mousedev; if (--mousedev_mix->open) return; list_for_each_entry(mousedev, &mousedev_mix_list, mixdev_node) { if (mousedev->mixdev_open) { mousedev->mixdev_open = 0; mousedev_close_device(mousedev); } } } static void mousedev_attach_client(struct mousedev *mousedev, struct mousedev_client *client) { spin_lock(&mousedev->client_lock); list_add_tail_rcu(&client->node, &mousedev->client_list); spin_unlock(&mousedev->client_lock); synchronize_rcu(); } static void mousedev_detach_client(struct mousedev *mousedev, struct mousedev_client *client) { spin_lock(&mousedev->client_lock); list_del_rcu(&client->node); spin_unlock(&mousedev->client_lock); synchronize_rcu(); } static int mousedev_release(struct inode *inode, struct file *file) { struct mousedev_client *client = file->private_data; struct mousedev *mousedev = client->mousedev; mousedev_detach_client(mousedev, client); kfree(client); mousedev_close_device(mousedev); put_device(&mousedev->dev); return 0; } static int mousedev_open(struct inode *inode, struct file *file) { struct mousedev_client *client; struct mousedev *mousedev; int error; int i; #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX if (imajor(inode) == MISC_MAJOR) i = MOUSEDEV_MIX; else #endif i = iminor(inode) - MOUSEDEV_MINOR_BASE; if (i >= MOUSEDEV_MINORS) return -ENODEV; error = mutex_lock_interruptible(&mousedev_table_mutex); if (error) { return error; } mousedev = mousedev_table[i]; if (mousedev) get_device(&mousedev->dev); mutex_unlock(&mousedev_table_mutex); if (!mousedev) { return -ENODEV; } client = kzalloc(sizeof(struct mousedev_client), GFP_KERNEL); if (!client) { error = -ENOMEM; goto err_put_mousedev; } spin_lock_init(&client->packet_lock); client->pos_x = xres / 2; client->pos_y = yres / 2; client->mousedev = mousedev; mousedev_attach_client(mousedev, client); error = mousedev_open_device(mousedev); if (error) goto err_free_client; file->private_data = client; return 0; err_free_client: mousedev_detach_client(mousedev, client); kfree(client); err_put_mousedev: put_device(&mousedev->dev); return error; } static inline int mousedev_limit_delta(int delta, int limit) { return delta > limit ? limit : (delta < -limit ? -limit : delta); } static void mousedev_packet(struct mousedev_client *client, signed char *ps2_data) { struct mousedev_motion *p = &client->packets[client->tail]; ps2_data[0] = 0x08 | ((p->dx < 0) << 4) | ((p->dy < 0) << 5) | (p->buttons & 0x07); ps2_data[1] = mousedev_limit_delta(p->dx, 127); ps2_data[2] = mousedev_limit_delta(p->dy, 127); p->dx -= ps2_data[1]; p->dy -= ps2_data[2]; switch (client->mode) { case MOUSEDEV_EMUL_EXPS: ps2_data[3] = mousedev_limit_delta(p->dz, 7); p->dz -= ps2_data[3]; ps2_data[3] = (ps2_data[3] & 0x0f) | ((p->buttons & 0x18) << 1); client->bufsiz = 4; break; case MOUSEDEV_EMUL_IMPS: ps2_data[0] |= ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1); ps2_data[3] = mousedev_limit_delta(p->dz, 127); p->dz -= ps2_data[3]; client->bufsiz = 4; break; case MOUSEDEV_EMUL_PS2: default: ps2_data[0] |= ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1); p->dz = 0; 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); } 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; signed char 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 unsigned int mousedev_poll(struct file *file, poll_table *wait) { struct mousedev_client *client = file->private_data; struct mousedev *mousedev = client->mousedev; unsigned int mask; poll_wait(file, &mousedev->wait, wait); mask = mousedev->exist ? POLLOUT | POLLWRNORM : POLLHUP | POLLERR; if (client->ready || client->buffer) mask |= POLLIN | POLLRDNORM; 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, }; static int mousedev_install_chrdev(struct mousedev *mousedev) { mousedev_table[mousedev->minor] = mousedev; return 0; } static void mousedev_remove_chrdev(struct mousedev *mousedev) { mutex_lock(&mousedev_table_mutex); mousedev_table[mousedev->minor] = NULL; mutex_unlock(&mousedev_table_mutex); } /* * 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_remove_chrdev(mousedev); /* mousedev is marked dead so no one else accesses mousedev->open */ if (mousedev->open) input_close_device(handle); } static struct mousedev *mousedev_create(struct input_dev *dev, struct input_handler *handler, int minor) { struct mousedev *mousedev; int error; mousedev = kzalloc(sizeof(struct mousedev), GFP_KERNEL); if (!mousedev) { error = -ENOMEM; goto err_out; } 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, minor == MOUSEDEV_MIX ? SINGLE_DEPTH_NESTING : 0); init_waitqueue_head(&mousedev->wait); if (minor == MOUSEDEV_MIX) dev_set_name(&mousedev->dev, "mice"); else dev_set_name(&mousedev->dev, "mouse%d", minor); mousedev->minor = minor; 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, MOUSEDEV_MINOR_BASE + minor); mousedev->dev.release = mousedev_free; device_initialize(&mousedev->dev); if (minor != MOUSEDEV_MIX) { error = input_register_handle(&mousedev->handle); if (error) goto err_free_mousedev; } error = mousedev_install_chrdev(mousedev); if (error) goto err_unregister_handle; error = device_add(&mousedev->dev); if (error) goto err_cleanup_mousedev; return mousedev; err_cleanup_mousedev: mousedev_cleanup(mousedev); err_unregister_handle: if (minor != MOUSEDEV_MIX) input_unregister_handle(&mousedev->handle); err_free_mousedev: put_device(&mousedev->dev); err_out: return ERR_PTR(error); } static void mousedev_destroy(struct mousedev *mousedev) { device_del(&mousedev->dev); mousedev_cleanup(mousedev); if (mousedev->minor != 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->mixdev_open = 1; } 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->mixdev_open) { mousedev->mixdev_open = 0; 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 minor; int error; for (minor = 0; minor < MOUSEDEV_MINORS; minor++) if (!mousedev_table[minor]) break; if (minor == MOUSEDEV_MINORS) { pr_err("no more free mousedev devices\n"); return -ENFILE; } mousedev = mousedev_create(dev, handler, minor); 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, .fops = &mousedev_fops, .minor = MOUSEDEV_MINOR_BASE, .name = "mousedev", .id_table = mousedev_ids, }; #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX static struct miscdevice psaux_mouse = { PSMOUSE_MINOR, "psaux", &mousedev_fops }; static int psaux_registered; #endif static int __init mousedev_init(void) { int error; mousedev_mix = mousedev_create(NULL, &mousedev_handler, MOUSEDEV_MIX); if (IS_ERR(mousedev_mix)) return PTR_ERR(mousedev_mix); error = input_register_handler(&mousedev_handler); if (error) { mousedev_destroy(mousedev_mix); return error; } #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX error = misc_register(&psaux_mouse); if (error) pr_warning("could not register psaux device, error: %d\n", error); else psaux_registered = 1; #endif pr_info("PS/2 mouse device common for all mice\n"); return 0; } static void __exit mousedev_exit(void) { #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX if (psaux_registered) misc_deregister(&psaux_mouse); #endif input_unregister_handler(&mousedev_handler); mousedev_destroy(mousedev_mix); } module_init(mousedev_init); module_exit(mousedev_exit);