diff options
Diffstat (limited to 'drivers/input/mousedev.c')
| -rw-r--r-- | drivers/input/mousedev.c | 1125 |
1 files changed, 1125 insertions, 0 deletions
diff --git a/drivers/input/mousedev.c b/drivers/input/mousedev.c new file mode 100644 index 000000000..505c562a5 --- /dev/null +++ b/drivers/input/mousedev.c @@ -0,0 +1,1125 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Input driver to ExplorerPS/2 device driver module. + * + * Copyright (c) 1999-2002 Vojtech Pavlik + * Copyright (c) 2004 Dmitry Torokhov + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#define MOUSEDEV_MINOR_BASE 32 +#define MOUSEDEV_MINORS 31 +#define MOUSEDEV_MIX 63 + +#include <linux/bitops.h> +#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/cdev.h> +#include <linux/kernel.h> + +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; + 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; + struct cdev cdev; + bool exist; + + struct list_head mixdev_node; + bool opened_by_mixdev; + + struct mousedev_hw_data packet; + unsigned int pkt_count; + int old_x[4], old_y[4]; + int frac_dx, frac_dy; + unsigned long touch; + + int (*open_device)(struct mousedev *mousedev); + void (*close_device)(struct mousedev *mousedev); +}; + +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; + + u8 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 mousedev *mousedev_mix; +static LIST_HEAD(mousedev_mix_list); + +#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; + + value = 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; + + value = 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 = clamp_val(client->pos_x, 0, xres); + + client->pos_y += packet->dy; + client->pos_y = clamp_val(client->pos_y, 0, yres); + + 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->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->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 int mixdev_open_devices(struct mousedev *mixdev) +{ + int error; + + error = mutex_lock_interruptible(&mixdev->mutex); + if (error) + return error; + + if (!mixdev->open++) { + struct mousedev *mousedev; + + list_for_each_entry(mousedev, &mousedev_mix_list, mixdev_node) { + if (!mousedev->opened_by_mixdev) { + if (mousedev_open_device(mousedev)) + continue; + + mousedev->opened_by_mixdev = true; + } + } + } + + mutex_unlock(&mixdev->mutex); + return 0; +} + +/* + * 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(struct mousedev *mixdev) +{ + mutex_lock(&mixdev->mutex); + + if (!--mixdev->open) { + struct mousedev *mousedev; + + list_for_each_entry(mousedev, &mousedev_mix_list, mixdev_node) { + if (mousedev->opened_by_mixdev) { + mousedev->opened_by_mixdev = false; + mousedev_close_device(mousedev); + } + } + } + + mutex_unlock(&mixdev->mutex); +} + + +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); +} + +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); + + return 0; +} + +static int mousedev_open(struct inode *inode, struct file *file) +{ + struct mousedev_client *client; + struct mousedev *mousedev; + int error; + +#ifdef CONFIG_INPUT_MOUSEDEV_PSAUX + if (imajor(inode) == MISC_MAJOR) + mousedev = mousedev_mix; + else +#endif + mousedev = container_of(inode->i_cdev, struct mousedev, cdev); + + client = kzalloc(sizeof(struct mousedev_client), GFP_KERNEL); + if (!client) + return -ENOMEM; + + 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; + stream_open(inode, file); + + return 0; + + err_free_client: + mousedev_detach_client(mousedev, client); + kfree(client); + return error; +} + +static void mousedev_packet(struct mousedev_client *client, u8 *ps2_data) +{ + struct mousedev_motion *p = &client->packets[client->tail]; + s8 dx, dy, dz; + + dx = clamp_val(p->dx, -127, 127); + p->dx -= dx; + + dy = clamp_val(p->dy, -127, 127); + p->dy -= dy; + + ps2_data[0] = BIT(3); + ps2_data[0] |= ((dx & BIT(7)) >> 3) | ((dy & BIT(7)) >> 2); + ps2_data[0] |= p->buttons & 0x07; + ps2_data[1] = dx; + ps2_data[2] = dy; + + switch (client->mode) { + case MOUSEDEV_EMUL_EXPS: + dz = clamp_val(p->dz, -7, 7); + p->dz -= dz; + + ps2_data[3] = (dz & 0x0f) | ((p->buttons & 0x18) << 1); + client->bufsiz = 4; + break; + + 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); |