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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/input/input.c | |
download | op-kernel-dev-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.zip op-kernel-dev-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz |
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'drivers/input/input.c')
-rw-r--r-- | drivers/input/input.c | 748 |
1 files changed, 748 insertions, 0 deletions
diff --git a/drivers/input/input.c b/drivers/input/input.c new file mode 100644 index 0000000..3385dd0 --- /dev/null +++ b/drivers/input/input.c @@ -0,0 +1,748 @@ +/* + * The input core + * + * Copyright (c) 1999-2002 Vojtech Pavlik + */ + +/* + * 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. + */ + +#include <linux/init.h> +#include <linux/sched.h> +#include <linux/smp_lock.h> +#include <linux/input.h> +#include <linux/module.h> +#include <linux/random.h> +#include <linux/major.h> +#include <linux/proc_fs.h> +#include <linux/kobject_uevent.h> +#include <linux/interrupt.h> +#include <linux/poll.h> +#include <linux/device.h> +#include <linux/devfs_fs_kernel.h> + +MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>"); +MODULE_DESCRIPTION("Input core"); +MODULE_LICENSE("GPL"); + +EXPORT_SYMBOL(input_register_device); +EXPORT_SYMBOL(input_unregister_device); +EXPORT_SYMBOL(input_register_handler); +EXPORT_SYMBOL(input_unregister_handler); +EXPORT_SYMBOL(input_grab_device); +EXPORT_SYMBOL(input_release_device); +EXPORT_SYMBOL(input_open_device); +EXPORT_SYMBOL(input_close_device); +EXPORT_SYMBOL(input_accept_process); +EXPORT_SYMBOL(input_flush_device); +EXPORT_SYMBOL(input_event); +EXPORT_SYMBOL(input_class); + +#define INPUT_DEVICES 256 + +static LIST_HEAD(input_dev_list); +static LIST_HEAD(input_handler_list); + +static struct input_handler *input_table[8]; + +#ifdef CONFIG_PROC_FS +static struct proc_dir_entry *proc_bus_input_dir; +static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait); +static int input_devices_state; +#endif + +void input_event(struct input_dev *dev, unsigned int type, unsigned int code, int value) +{ + struct input_handle *handle; + + if (type > EV_MAX || !test_bit(type, dev->evbit)) + return; + + add_input_randomness(type, code, value); + + switch (type) { + + case EV_SYN: + switch (code) { + case SYN_CONFIG: + if (dev->event) dev->event(dev, type, code, value); + break; + + case SYN_REPORT: + if (dev->sync) return; + dev->sync = 1; + break; + } + break; + + case EV_KEY: + + if (code > KEY_MAX || !test_bit(code, dev->keybit) || !!test_bit(code, dev->key) == value) + return; + + if (value == 2) + break; + + change_bit(code, dev->key); + + if (test_bit(EV_REP, dev->evbit) && dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] && dev->timer.data && value) { + dev->repeat_key = code; + mod_timer(&dev->timer, jiffies + msecs_to_jiffies(dev->rep[REP_DELAY])); + } + + break; + + case EV_ABS: + + if (code > ABS_MAX || !test_bit(code, dev->absbit)) + return; + + if (dev->absfuzz[code]) { + if ((value > dev->abs[code] - (dev->absfuzz[code] >> 1)) && + (value < dev->abs[code] + (dev->absfuzz[code] >> 1))) + return; + + if ((value > dev->abs[code] - dev->absfuzz[code]) && + (value < dev->abs[code] + dev->absfuzz[code])) + value = (dev->abs[code] * 3 + value) >> 2; + + if ((value > dev->abs[code] - (dev->absfuzz[code] << 1)) && + (value < dev->abs[code] + (dev->absfuzz[code] << 1))) + value = (dev->abs[code] + value) >> 1; + } + + if (dev->abs[code] == value) + return; + + dev->abs[code] = value; + break; + + case EV_REL: + + if (code > REL_MAX || !test_bit(code, dev->relbit) || (value == 0)) + return; + + break; + + case EV_MSC: + + if (code > MSC_MAX || !test_bit(code, dev->mscbit)) + return; + + if (dev->event) dev->event(dev, type, code, value); + + break; + + case EV_LED: + + if (code > LED_MAX || !test_bit(code, dev->ledbit) || !!test_bit(code, dev->led) == value) + return; + + change_bit(code, dev->led); + if (dev->event) dev->event(dev, type, code, value); + + break; + + case EV_SND: + + if (code > SND_MAX || !test_bit(code, dev->sndbit)) + return; + + if (dev->event) dev->event(dev, type, code, value); + + break; + + case EV_REP: + + if (code > REP_MAX || value < 0 || dev->rep[code] == value) return; + + dev->rep[code] = value; + if (dev->event) dev->event(dev, type, code, value); + + break; + + case EV_FF: + if (dev->event) dev->event(dev, type, code, value); + break; + } + + if (type != EV_SYN) + dev->sync = 0; + + if (dev->grab) + dev->grab->handler->event(dev->grab, type, code, value); + else + list_for_each_entry(handle, &dev->h_list, d_node) + if (handle->open) + handle->handler->event(handle, type, code, value); +} + +static void input_repeat_key(unsigned long data) +{ + struct input_dev *dev = (void *) data; + + if (!test_bit(dev->repeat_key, dev->key)) + return; + + input_event(dev, EV_KEY, dev->repeat_key, 2); + input_sync(dev); + + if (dev->rep[REP_PERIOD]) + mod_timer(&dev->timer, jiffies + msecs_to_jiffies(dev->rep[REP_PERIOD])); +} + +int input_accept_process(struct input_handle *handle, struct file *file) +{ + if (handle->dev->accept) + return handle->dev->accept(handle->dev, file); + + return 0; +} + +int input_grab_device(struct input_handle *handle) +{ + if (handle->dev->grab) + return -EBUSY; + + handle->dev->grab = handle; + return 0; +} + +void input_release_device(struct input_handle *handle) +{ + if (handle->dev->grab == handle) + handle->dev->grab = NULL; +} + +int input_open_device(struct input_handle *handle) +{ + handle->open++; + if (handle->dev->open) + return handle->dev->open(handle->dev); + return 0; +} + +int input_flush_device(struct input_handle* handle, struct file* file) +{ + if (handle->dev->flush) + return handle->dev->flush(handle->dev, file); + + return 0; +} + +void input_close_device(struct input_handle *handle) +{ + input_release_device(handle); + if (handle->dev->close) + handle->dev->close(handle->dev); + handle->open--; +} + +static void input_link_handle(struct input_handle *handle) +{ + list_add_tail(&handle->d_node, &handle->dev->h_list); + list_add_tail(&handle->h_node, &handle->handler->h_list); +} + +#define MATCH_BIT(bit, max) \ + for (i = 0; i < NBITS(max); i++) \ + if ((id->bit[i] & dev->bit[i]) != id->bit[i]) \ + break; \ + if (i != NBITS(max)) \ + continue; + +static struct input_device_id *input_match_device(struct input_device_id *id, struct input_dev *dev) +{ + int i; + + for (; id->flags || id->driver_info; id++) { + + if (id->flags & INPUT_DEVICE_ID_MATCH_BUS) + if (id->id.bustype != dev->id.bustype) + continue; + + if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR) + if (id->id.vendor != dev->id.vendor) + continue; + + if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT) + if (id->id.product != dev->id.product) + continue; + + if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION) + if (id->id.version != dev->id.version) + continue; + + MATCH_BIT(evbit, EV_MAX); + MATCH_BIT(keybit, KEY_MAX); + MATCH_BIT(relbit, REL_MAX); + MATCH_BIT(absbit, ABS_MAX); + MATCH_BIT(mscbit, MSC_MAX); + MATCH_BIT(ledbit, LED_MAX); + MATCH_BIT(sndbit, SND_MAX); + MATCH_BIT(ffbit, FF_MAX); + + return id; + } + + return NULL; +} + +/* + * Input hotplugging interface - loading event handlers based on + * device bitfields. + */ + +#ifdef CONFIG_HOTPLUG + +/* + * Input hotplugging invokes what /proc/sys/kernel/hotplug says + * (normally /sbin/hotplug) when input devices get added or removed. + * + * This invokes a user mode policy agent, typically helping to load driver + * or other modules, configure the device, and more. Drivers can provide + * a MODULE_DEVICE_TABLE to help with module loading subtasks. + * + */ + +#define SPRINTF_BIT_A(bit, name, max) \ + do { \ + envp[i++] = scratch; \ + scratch += sprintf(scratch, name); \ + for (j = NBITS(max) - 1; j >= 0; j--) \ + if (dev->bit[j]) break; \ + for (; j >= 0; j--) \ + scratch += sprintf(scratch, "%lx ", dev->bit[j]); \ + scratch++; \ + } while (0) + +#define SPRINTF_BIT_A2(bit, name, max, ev) \ + do { \ + if (test_bit(ev, dev->evbit)) \ + SPRINTF_BIT_A(bit, name, max); \ + } while (0) + +static void input_call_hotplug(char *verb, struct input_dev *dev) +{ + char *argv[3], **envp, *buf, *scratch; + int i = 0, j, value; + + if (!hotplug_path[0]) { + printk(KERN_ERR "input.c: calling hotplug without a hotplug agent defined\n"); + return; + } + if (in_interrupt()) { + printk(KERN_ERR "input.c: calling hotplug from interrupt\n"); + return; + } + if (!current->fs->root) { + printk(KERN_WARNING "input.c: calling hotplug without valid filesystem\n"); + return; + } + if (!(envp = (char **) kmalloc(20 * sizeof(char *), GFP_KERNEL))) { + printk(KERN_ERR "input.c: not enough memory allocating hotplug environment\n"); + return; + } + if (!(buf = kmalloc(1024, GFP_KERNEL))) { + kfree (envp); + printk(KERN_ERR "input.c: not enough memory allocating hotplug environment\n"); + return; + } + + argv[0] = hotplug_path; + argv[1] = "input"; + argv[2] = NULL; + + envp[i++] = "HOME=/"; + envp[i++] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin"; + + scratch = buf; + + envp[i++] = scratch; + scratch += sprintf(scratch, "ACTION=%s", verb) + 1; + + envp[i++] = scratch; + scratch += sprintf(scratch, "PRODUCT=%x/%x/%x/%x", + dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version) + 1; + + if (dev->name) { + envp[i++] = scratch; + scratch += sprintf(scratch, "NAME=%s", dev->name) + 1; + } + + if (dev->phys) { + envp[i++] = scratch; + scratch += sprintf(scratch, "PHYS=%s", dev->phys) + 1; + } + + SPRINTF_BIT_A(evbit, "EV=", EV_MAX); + SPRINTF_BIT_A2(keybit, "KEY=", KEY_MAX, EV_KEY); + SPRINTF_BIT_A2(relbit, "REL=", REL_MAX, EV_REL); + SPRINTF_BIT_A2(absbit, "ABS=", ABS_MAX, EV_ABS); + SPRINTF_BIT_A2(mscbit, "MSC=", MSC_MAX, EV_MSC); + SPRINTF_BIT_A2(ledbit, "LED=", LED_MAX, EV_LED); + SPRINTF_BIT_A2(sndbit, "SND=", SND_MAX, EV_SND); + SPRINTF_BIT_A2(ffbit, "FF=", FF_MAX, EV_FF); + + envp[i++] = NULL; + +#ifdef INPUT_DEBUG + printk(KERN_DEBUG "input.c: calling %s %s [%s %s %s %s %s]\n", + argv[0], argv[1], envp[0], envp[1], envp[2], envp[3], envp[4]); +#endif + + value = call_usermodehelper(argv [0], argv, envp, 0); + + kfree(buf); + kfree(envp); + +#ifdef INPUT_DEBUG + if (value != 0) + printk(KERN_DEBUG "input.c: hotplug returned %d\n", value); +#endif +} + +#endif + +void input_register_device(struct input_dev *dev) +{ + struct input_handle *handle; + struct input_handler *handler; + struct input_device_id *id; + + set_bit(EV_SYN, dev->evbit); + + /* + * If delay and period are pre-set by the driver, then autorepeating + * is handled by the driver itself and we don't do it in input.c. + */ + + init_timer(&dev->timer); + if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) { + dev->timer.data = (long) dev; + dev->timer.function = input_repeat_key; + dev->rep[REP_DELAY] = 250; + dev->rep[REP_PERIOD] = 33; + } + + INIT_LIST_HEAD(&dev->h_list); + list_add_tail(&dev->node, &input_dev_list); + + list_for_each_entry(handler, &input_handler_list, node) + if (!handler->blacklist || !input_match_device(handler->blacklist, dev)) + if ((id = input_match_device(handler->id_table, dev))) + if ((handle = handler->connect(handler, dev, id))) + input_link_handle(handle); + +#ifdef CONFIG_HOTPLUG + input_call_hotplug("add", dev); +#endif + +#ifdef CONFIG_PROC_FS + input_devices_state++; + wake_up(&input_devices_poll_wait); +#endif +} + +void input_unregister_device(struct input_dev *dev) +{ + struct list_head * node, * next; + + if (!dev) return; + + del_timer_sync(&dev->timer); + + list_for_each_safe(node, next, &dev->h_list) { + struct input_handle * handle = to_handle(node); + list_del_init(&handle->d_node); + list_del_init(&handle->h_node); + handle->handler->disconnect(handle); + } + +#ifdef CONFIG_HOTPLUG + input_call_hotplug("remove", dev); +#endif + + list_del_init(&dev->node); + +#ifdef CONFIG_PROC_FS + input_devices_state++; + wake_up(&input_devices_poll_wait); +#endif +} + +void input_register_handler(struct input_handler *handler) +{ + struct input_dev *dev; + struct input_handle *handle; + struct input_device_id *id; + + if (!handler) return; + + INIT_LIST_HEAD(&handler->h_list); + + if (handler->fops != NULL) + input_table[handler->minor >> 5] = handler; + + list_add_tail(&handler->node, &input_handler_list); + + list_for_each_entry(dev, &input_dev_list, node) + if (!handler->blacklist || !input_match_device(handler->blacklist, dev)) + if ((id = input_match_device(handler->id_table, dev))) + if ((handle = handler->connect(handler, dev, id))) + input_link_handle(handle); + +#ifdef CONFIG_PROC_FS + input_devices_state++; + wake_up(&input_devices_poll_wait); +#endif +} + +void input_unregister_handler(struct input_handler *handler) +{ + struct list_head * node, * next; + + list_for_each_safe(node, next, &handler->h_list) { + struct input_handle * handle = to_handle_h(node); + list_del_init(&handle->h_node); + list_del_init(&handle->d_node); + handler->disconnect(handle); + } + + list_del_init(&handler->node); + + if (handler->fops != NULL) + input_table[handler->minor >> 5] = NULL; + +#ifdef CONFIG_PROC_FS + input_devices_state++; + wake_up(&input_devices_poll_wait); +#endif +} + +static int input_open_file(struct inode *inode, struct file *file) +{ + struct input_handler *handler = input_table[iminor(inode) >> 5]; + struct file_operations *old_fops, *new_fops = NULL; + int err; + + /* No load-on-demand here? */ + if (!handler || !(new_fops = fops_get(handler->fops))) + return -ENODEV; + + /* + * That's _really_ odd. Usually NULL ->open means "nothing special", + * not "no device". Oh, well... + */ + if (!new_fops->open) { + fops_put(new_fops); + return -ENODEV; + } + old_fops = file->f_op; + file->f_op = new_fops; + + err = new_fops->open(inode, file); + + if (err) { + fops_put(file->f_op); + file->f_op = fops_get(old_fops); + } + fops_put(old_fops); + return err; +} + +static struct file_operations input_fops = { + .owner = THIS_MODULE, + .open = input_open_file, +}; + +#ifdef CONFIG_PROC_FS + +#define SPRINTF_BIT_B(bit, name, max) \ + do { \ + len += sprintf(buf + len, "B: %s", name); \ + for (i = NBITS(max) - 1; i >= 0; i--) \ + if (dev->bit[i]) break; \ + for (; i >= 0; i--) \ + len += sprintf(buf + len, "%lx ", dev->bit[i]); \ + len += sprintf(buf + len, "\n"); \ + } while (0) + +#define SPRINTF_BIT_B2(bit, name, max, ev) \ + do { \ + if (test_bit(ev, dev->evbit)) \ + SPRINTF_BIT_B(bit, name, max); \ + } while (0) + + +static unsigned int input_devices_poll(struct file *file, poll_table *wait) +{ + int state = input_devices_state; + poll_wait(file, &input_devices_poll_wait, wait); + if (state != input_devices_state) + return POLLIN | POLLRDNORM; + return 0; +} + +static int input_devices_read(char *buf, char **start, off_t pos, int count, int *eof, void *data) +{ + struct input_dev *dev; + struct input_handle *handle; + + off_t at = 0; + int i, len, cnt = 0; + + list_for_each_entry(dev, &input_dev_list, node) { + + len = sprintf(buf, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n", + dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version); + + len += sprintf(buf + len, "N: Name=\"%s\"\n", dev->name ? dev->name : ""); + len += sprintf(buf + len, "P: Phys=%s\n", dev->phys ? dev->phys : ""); + len += sprintf(buf + len, "H: Handlers="); + + list_for_each_entry(handle, &dev->h_list, d_node) + len += sprintf(buf + len, "%s ", handle->name); + + len += sprintf(buf + len, "\n"); + + SPRINTF_BIT_B(evbit, "EV=", EV_MAX); + SPRINTF_BIT_B2(keybit, "KEY=", KEY_MAX, EV_KEY); + SPRINTF_BIT_B2(relbit, "REL=", REL_MAX, EV_REL); + SPRINTF_BIT_B2(absbit, "ABS=", ABS_MAX, EV_ABS); + SPRINTF_BIT_B2(mscbit, "MSC=", MSC_MAX, EV_MSC); + SPRINTF_BIT_B2(ledbit, "LED=", LED_MAX, EV_LED); + SPRINTF_BIT_B2(sndbit, "SND=", SND_MAX, EV_SND); + SPRINTF_BIT_B2(ffbit, "FF=", FF_MAX, EV_FF); + + len += sprintf(buf + len, "\n"); + + at += len; + + if (at >= pos) { + if (!*start) { + *start = buf + (pos - (at - len)); + cnt = at - pos; + } else cnt += len; + buf += len; + if (cnt >= count) + break; + } + } + + if (&dev->node == &input_dev_list) + *eof = 1; + + return (count > cnt) ? cnt : count; +} + +static int input_handlers_read(char *buf, char **start, off_t pos, int count, int *eof, void *data) +{ + struct input_handler *handler; + + off_t at = 0; + int len = 0, cnt = 0; + int i = 0; + + list_for_each_entry(handler, &input_handler_list, node) { + + if (handler->fops) + len = sprintf(buf, "N: Number=%d Name=%s Minor=%d\n", + i++, handler->name, handler->minor); + else + len = sprintf(buf, "N: Number=%d Name=%s\n", + i++, handler->name); + + at += len; + + if (at >= pos) { + if (!*start) { + *start = buf + (pos - (at - len)); + cnt = at - pos; + } else cnt += len; + buf += len; + if (cnt >= count) + break; + } + } + if (&handler->node == &input_handler_list) + *eof = 1; + + return (count > cnt) ? cnt : count; +} + +static int __init input_proc_init(void) +{ + struct proc_dir_entry *entry; + + proc_bus_input_dir = proc_mkdir("input", proc_bus); + if (proc_bus_input_dir == NULL) + return -ENOMEM; + proc_bus_input_dir->owner = THIS_MODULE; + entry = create_proc_read_entry("devices", 0, proc_bus_input_dir, input_devices_read, NULL); + if (entry == NULL) { + remove_proc_entry("input", proc_bus); + return -ENOMEM; + } + entry->owner = THIS_MODULE; + entry->proc_fops->poll = input_devices_poll; + entry = create_proc_read_entry("handlers", 0, proc_bus_input_dir, input_handlers_read, NULL); + if (entry == NULL) { + remove_proc_entry("devices", proc_bus_input_dir); + remove_proc_entry("input", proc_bus); + return -ENOMEM; + } + entry->owner = THIS_MODULE; + return 0; +} +#else /* !CONFIG_PROC_FS */ +static inline int input_proc_init(void) { return 0; } +#endif + +struct class_simple *input_class; + +static int __init input_init(void) +{ + int retval = -ENOMEM; + + input_class = class_simple_create(THIS_MODULE, "input"); + if (IS_ERR(input_class)) + return PTR_ERR(input_class); + input_proc_init(); + retval = register_chrdev(INPUT_MAJOR, "input", &input_fops); + if (retval) { + printk(KERN_ERR "input: unable to register char major %d", INPUT_MAJOR); + remove_proc_entry("devices", proc_bus_input_dir); + remove_proc_entry("handlers", proc_bus_input_dir); + remove_proc_entry("input", proc_bus); + class_simple_destroy(input_class); + return retval; + } + + retval = devfs_mk_dir("input"); + if (retval) { + remove_proc_entry("devices", proc_bus_input_dir); + remove_proc_entry("handlers", proc_bus_input_dir); + remove_proc_entry("input", proc_bus); + unregister_chrdev(INPUT_MAJOR, "input"); + class_simple_destroy(input_class); + } + return retval; +} + +static void __exit input_exit(void) +{ + remove_proc_entry("devices", proc_bus_input_dir); + remove_proc_entry("handlers", proc_bus_input_dir); + remove_proc_entry("input", proc_bus); + + devfs_remove("input"); + unregister_chrdev(INPUT_MAJOR, "input"); + class_simple_destroy(input_class); +} + +subsys_initcall(input_init); +module_exit(input_exit); |