diff options
Diffstat (limited to 'drivers/media/IR/ir-keytable.c')
| -rw-r--r-- | drivers/media/IR/ir-keytable.c | 572 |
1 files changed, 0 insertions, 572 deletions
diff --git a/drivers/media/IR/ir-keytable.c b/drivers/media/IR/ir-keytable.c deleted file mode 100644 index 7961d59f5ca..00000000000 --- a/drivers/media/IR/ir-keytable.c +++ /dev/null @@ -1,572 +0,0 @@ -/* ir-keytable.c - handle IR scancode->keycode tables - * - * Copyright (C) 2009 by Mauro Carvalho Chehab <mchehab@redhat.com> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation version 2 of the License. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - */ - - -#include <linux/input.h> -#include <linux/slab.h> -#include "ir-core-priv.h" - -/* Sizes are in bytes, 256 bytes allows for 32 entries on x64 */ -#define IR_TAB_MIN_SIZE 256 -#define IR_TAB_MAX_SIZE 8192 - -/* FIXME: IR_KEYPRESS_TIMEOUT should be protocol specific */ -#define IR_KEYPRESS_TIMEOUT 250 - -/** - * ir_resize_table() - resizes a scancode table if necessary - * @rc_tab: the ir_scancode_table to resize - * @return: zero on success or a negative error code - * - * This routine will shrink the ir_scancode_table if it has lots of - * unused entries and grow it if it is full. - */ -static int ir_resize_table(struct ir_scancode_table *rc_tab) -{ - unsigned int oldalloc = rc_tab->alloc; - unsigned int newalloc = oldalloc; - struct ir_scancode *oldscan = rc_tab->scan; - struct ir_scancode *newscan; - - if (rc_tab->size == rc_tab->len) { - /* All entries in use -> grow keytable */ - if (rc_tab->alloc >= IR_TAB_MAX_SIZE) - return -ENOMEM; - - newalloc *= 2; - IR_dprintk(1, "Growing table to %u bytes\n", newalloc); - } - - if ((rc_tab->len * 3 < rc_tab->size) && (oldalloc > IR_TAB_MIN_SIZE)) { - /* Less than 1/3 of entries in use -> shrink keytable */ - newalloc /= 2; - IR_dprintk(1, "Shrinking table to %u bytes\n", newalloc); - } - - if (newalloc == oldalloc) - return 0; - - newscan = kmalloc(newalloc, GFP_ATOMIC); - if (!newscan) { - IR_dprintk(1, "Failed to kmalloc %u bytes\n", newalloc); - return -ENOMEM; - } - - memcpy(newscan, rc_tab->scan, rc_tab->len * sizeof(struct ir_scancode)); - rc_tab->scan = newscan; - rc_tab->alloc = newalloc; - rc_tab->size = rc_tab->alloc / sizeof(struct ir_scancode); - kfree(oldscan); - return 0; -} - -/** - * ir_do_setkeycode() - internal function to set a keycode in the - * scancode->keycode table - * @dev: the struct input_dev device descriptor - * @rc_tab: the struct ir_scancode_table to set the keycode in - * @scancode: the scancode for the ir command - * @keycode: the keycode for the ir command - * @resize: whether the keytable may be shrunk - * @return: -EINVAL if the keycode could not be inserted, otherwise zero. - * - * This routine is used internally to manipulate the scancode->keycode table. - * The caller has to hold @rc_tab->lock. - */ -static int ir_do_setkeycode(struct input_dev *dev, - struct ir_scancode_table *rc_tab, - unsigned scancode, unsigned keycode, - bool resize) -{ - unsigned int i; - int old_keycode = KEY_RESERVED; - struct ir_input_dev *ir_dev = input_get_drvdata(dev); - - /* - * Unfortunately, some hardware-based IR decoders don't provide - * all bits for the complete IR code. In general, they provide only - * the command part of the IR code. Yet, as it is possible to replace - * the provided IR with another one, it is needed to allow loading - * IR tables from other remotes. So, - */ - if (ir_dev->props && ir_dev->props->scanmask) { - scancode &= ir_dev->props->scanmask; - } - - /* First check if we already have a mapping for this ir command */ - for (i = 0; i < rc_tab->len; i++) { - /* Keytable is sorted from lowest to highest scancode */ - if (rc_tab->scan[i].scancode > scancode) - break; - else if (rc_tab->scan[i].scancode < scancode) - continue; - - old_keycode = rc_tab->scan[i].keycode; - rc_tab->scan[i].keycode = keycode; - - /* Did the user wish to remove the mapping? */ - if (keycode == KEY_RESERVED || keycode == KEY_UNKNOWN) { - IR_dprintk(1, "#%d: Deleting scan 0x%04x\n", - i, scancode); - rc_tab->len--; - memmove(&rc_tab->scan[i], &rc_tab->scan[i + 1], - (rc_tab->len - i) * sizeof(struct ir_scancode)); - } - - /* Possibly shrink the keytable, failure is not a problem */ - ir_resize_table(rc_tab); - break; - } - - if (old_keycode == KEY_RESERVED && keycode != KEY_RESERVED) { - /* No previous mapping found, we might need to grow the table */ - if (resize && ir_resize_table(rc_tab)) - return -ENOMEM; - - IR_dprintk(1, "#%d: New scan 0x%04x with key 0x%04x\n", - i, scancode, keycode); - - /* i is the proper index to insert our new keycode */ - memmove(&rc_tab->scan[i + 1], &rc_tab->scan[i], - (rc_tab->len - i) * sizeof(struct ir_scancode)); - rc_tab->scan[i].scancode = scancode; - rc_tab->scan[i].keycode = keycode; - rc_tab->len++; - set_bit(keycode, dev->keybit); - } else { - IR_dprintk(1, "#%d: Replacing scan 0x%04x with key 0x%04x\n", - i, scancode, keycode); - /* A previous mapping was updated... */ - clear_bit(old_keycode, dev->keybit); - /* ...but another scancode might use the same keycode */ - for (i = 0; i < rc_tab->len; i++) { - if (rc_tab->scan[i].keycode == old_keycode) { - set_bit(old_keycode, dev->keybit); - break; - } - } - } - - return 0; -} - -/** - * ir_setkeycode() - set a keycode in the scancode->keycode table - * @dev: the struct input_dev device descriptor - * @scancode: the desired scancode - * @keycode: result - * @return: -EINVAL if the keycode could not be inserted, otherwise zero. - * - * This routine is used to handle evdev EVIOCSKEY ioctl. - */ -static int ir_setkeycode(struct input_dev *dev, - unsigned int scancode, unsigned int keycode) -{ - int rc; - unsigned long flags; - struct ir_input_dev *ir_dev = input_get_drvdata(dev); - struct ir_scancode_table *rc_tab = &ir_dev->rc_tab; - - spin_lock_irqsave(&rc_tab->lock, flags); - rc = ir_do_setkeycode(dev, rc_tab, scancode, keycode, true); - spin_unlock_irqrestore(&rc_tab->lock, flags); - return rc; -} - -/** - * ir_setkeytable() - sets several entries in the scancode->keycode table - * @dev: the struct input_dev device descriptor - * @to: the struct ir_scancode_table to copy entries to - * @from: the struct ir_scancode_table to copy entries from - * @return: -EINVAL if all keycodes could not be inserted, otherwise zero. - * - * This routine is used to handle table initialization. - */ -static int ir_setkeytable(struct input_dev *dev, - struct ir_scancode_table *to, - const struct ir_scancode_table *from) -{ - struct ir_input_dev *ir_dev = input_get_drvdata(dev); - struct ir_scancode_table *rc_tab = &ir_dev->rc_tab; - unsigned long flags; - unsigned int i; - int rc = 0; - - spin_lock_irqsave(&rc_tab->lock, flags); - for (i = 0; i < from->size; i++) { - rc = ir_do_setkeycode(dev, to, from->scan[i].scancode, - from->scan[i].keycode, false); - if (rc) - break; - } - spin_unlock_irqrestore(&rc_tab->lock, flags); - return rc; -} - -/** - * ir_getkeycode() - get a keycode from the scancode->keycode table - * @dev: the struct input_dev device descriptor - * @scancode: the desired scancode - * @keycode: used to return the keycode, if found, or KEY_RESERVED - * @return: always returns zero. - * - * This routine is used to handle evdev EVIOCGKEY ioctl. - */ -static int ir_getkeycode(struct input_dev *dev, - unsigned int scancode, unsigned int *keycode) -{ - int start, end, mid; - unsigned long flags; - int key = KEY_RESERVED; - struct ir_input_dev *ir_dev = input_get_drvdata(dev); - struct ir_scancode_table *rc_tab = &ir_dev->rc_tab; - - spin_lock_irqsave(&rc_tab->lock, flags); - start = 0; - end = rc_tab->len - 1; - while (start <= end) { - mid = (start + end) / 2; - if (rc_tab->scan[mid].scancode < scancode) - start = mid + 1; - else if (rc_tab->scan[mid].scancode > scancode) - end = mid - 1; - else { - key = rc_tab->scan[mid].keycode; - break; - } - } - spin_unlock_irqrestore(&rc_tab->lock, flags); - - if (key == KEY_RESERVED) - IR_dprintk(1, "unknown key for scancode 0x%04x\n", - scancode); - - *keycode = key; - return 0; -} - -/** - * ir_g_keycode_from_table() - gets the keycode that corresponds to a scancode - * @input_dev: the struct input_dev descriptor of the device - * @scancode: the scancode that we're seeking - * - * This routine is used by the input routines when a key is pressed at the - * IR. The scancode is received and needs to be converted into a keycode. - * If the key is not found, it returns KEY_RESERVED. Otherwise, returns the - * corresponding keycode from the table. - */ -u32 ir_g_keycode_from_table(struct input_dev *dev, u32 scancode) -{ - int keycode; - - ir_getkeycode(dev, scancode, &keycode); - if (keycode != KEY_RESERVED) - IR_dprintk(1, "%s: scancode 0x%04x keycode 0x%02x\n", - dev->name, scancode, keycode); - return keycode; -} -EXPORT_SYMBOL_GPL(ir_g_keycode_from_table); - -/** - * ir_keyup() - generates input event to cleanup a key press - * @ir: the struct ir_input_dev descriptor of the device - * - * This routine is used to signal that a key has been released on the - * remote control. It reports a keyup input event via input_report_key(). - */ -static void ir_keyup(struct ir_input_dev *ir) -{ - if (!ir->keypressed) - return; - - IR_dprintk(1, "keyup key 0x%04x\n", ir->last_keycode); - input_report_key(ir->input_dev, ir->last_keycode, 0); - input_sync(ir->input_dev); - ir->keypressed = false; -} - -/** - * ir_timer_keyup() - generates a keyup event after a timeout - * @cookie: a pointer to struct ir_input_dev passed to setup_timer() - * - * This routine will generate a keyup event some time after a keydown event - * is generated when no further activity has been detected. - */ -static void ir_timer_keyup(unsigned long cookie) -{ - struct ir_input_dev *ir = (struct ir_input_dev *)cookie; - unsigned long flags; - - /* - * ir->keyup_jiffies is used to prevent a race condition if a - * hardware interrupt occurs at this point and the keyup timer - * event is moved further into the future as a result. - * - * The timer will then be reactivated and this function called - * again in the future. We need to exit gracefully in that case - * to allow the input subsystem to do its auto-repeat magic or - * a keyup event might follow immediately after the keydown. - */ - spin_lock_irqsave(&ir->keylock, flags); - if (time_is_before_eq_jiffies(ir->keyup_jiffies)) - ir_keyup(ir); - spin_unlock_irqrestore(&ir->keylock, flags); -} - -/** - * ir_repeat() - notifies the IR core that a key is still pressed - * @dev: the struct input_dev descriptor of the device - * - * This routine is used by IR decoders when a repeat message which does - * not include the necessary bits to reproduce the scancode has been - * received. - */ -void ir_repeat(struct input_dev *dev) -{ - unsigned long flags; - struct ir_input_dev *ir = input_get_drvdata(dev); - - spin_lock_irqsave(&ir->keylock, flags); - - input_event(dev, EV_MSC, MSC_SCAN, ir->last_scancode); - - if (!ir->keypressed) - goto out; - - ir->keyup_jiffies = jiffies + msecs_to_jiffies(IR_KEYPRESS_TIMEOUT); - mod_timer(&ir->timer_keyup, ir->keyup_jiffies); - -out: - spin_unlock_irqrestore(&ir->keylock, flags); -} -EXPORT_SYMBOL_GPL(ir_repeat); - -/** - * ir_keydown() - generates input event for a key press - * @dev: the struct input_dev descriptor of the device - * @scancode: the scancode that we're seeking - * @toggle: the toggle value (protocol dependent, if the protocol doesn't - * support toggle values, this should be set to zero) - * - * This routine is used by the input routines when a key is pressed at the - * IR. It gets the keycode for a scancode and reports an input event via - * input_report_key(). - */ -void ir_keydown(struct input_dev *dev, int scancode, u8 toggle) -{ - unsigned long flags; - struct ir_input_dev *ir = input_get_drvdata(dev); - - u32 keycode = ir_g_keycode_from_table(dev, scancode); - - spin_lock_irqsave(&ir->keylock, flags); - - input_event(dev, EV_MSC, MSC_SCAN, scancode); - - /* Repeat event? */ - if (ir->keypressed && - ir->last_scancode == scancode && - ir->last_toggle == toggle) - goto set_timer; - - /* Release old keypress */ - ir_keyup(ir); - - ir->last_scancode = scancode; - ir->last_toggle = toggle; - ir->last_keycode = keycode; - - - if (keycode == KEY_RESERVED) - goto out; - - - /* Register a keypress */ - ir->keypressed = true; - IR_dprintk(1, "%s: key down event, key 0x%04x, scancode 0x%04x\n", - dev->name, keycode, scancode); - input_report_key(dev, ir->last_keycode, 1); - input_sync(dev); - -set_timer: - ir->keyup_jiffies = jiffies + msecs_to_jiffies(IR_KEYPRESS_TIMEOUT); - mod_timer(&ir->timer_keyup, ir->keyup_jiffies); -out: - spin_unlock_irqrestore(&ir->keylock, flags); -} -EXPORT_SYMBOL_GPL(ir_keydown); - -static int ir_open(struct input_dev *input_dev) -{ - struct ir_input_dev *ir_dev = input_get_drvdata(input_dev); - - return ir_dev->props->open(ir_dev->props->priv); -} - -static void ir_close(struct input_dev *input_dev) -{ - struct ir_input_dev *ir_dev = input_get_drvdata(input_dev); - - ir_dev->props->close(ir_dev->props->priv); -} - -/** - * __ir_input_register() - sets the IR keycode table and add the handlers - * for keymap table get/set - * @input_dev: the struct input_dev descriptor of the device - * @rc_tab: the struct ir_scancode_table table of scancode/keymap - * - * This routine is used to initialize the input infrastructure - * to work with an IR. - * It will register the input/evdev interface for the device and - * register the syfs code for IR class - */ -int __ir_input_register(struct input_dev *input_dev, - const struct ir_scancode_table *rc_tab, - struct ir_dev_props *props, - const char *driver_name) -{ - struct ir_input_dev *ir_dev; - int rc; - - if (rc_tab->scan == NULL || !rc_tab->size) - return -EINVAL; - - ir_dev = kzalloc(sizeof(*ir_dev), GFP_KERNEL); - if (!ir_dev) - return -ENOMEM; - - ir_dev->driver_name = kasprintf(GFP_KERNEL, "%s", driver_name); - if (!ir_dev->driver_name) { - rc = -ENOMEM; - goto out_dev; - } - - input_dev->getkeycode = ir_getkeycode; - input_dev->setkeycode = ir_setkeycode; - input_set_drvdata(input_dev, ir_dev); - ir_dev->input_dev = input_dev; - - spin_lock_init(&ir_dev->rc_tab.lock); - spin_lock_init(&ir_dev->keylock); - setup_timer(&ir_dev->timer_keyup, ir_timer_keyup, (unsigned long)ir_dev); - - ir_dev->rc_tab.name = rc_tab->name; - ir_dev->rc_tab.ir_type = rc_tab->ir_type; - ir_dev->rc_tab.alloc = roundup_pow_of_two(rc_tab->size * - sizeof(struct ir_scancode)); - ir_dev->rc_tab.scan = kmalloc(ir_dev->rc_tab.alloc, GFP_KERNEL); - ir_dev->rc_tab.size = ir_dev->rc_tab.alloc / sizeof(struct ir_scancode); - if (props) { - ir_dev->props = props; - if (props->open) - input_dev->open = ir_open; - if (props->close) - input_dev->close = ir_close; - } - - if (!ir_dev->rc_tab.scan) { - rc = -ENOMEM; - goto out_name; - } - - IR_dprintk(1, "Allocated space for %u keycode entries (%u bytes)\n", - ir_dev->rc_tab.size, ir_dev->rc_tab.alloc); - - set_bit(EV_KEY, input_dev->evbit); - set_bit(EV_REP, input_dev->evbit); - set_bit(EV_MSC, input_dev->evbit); - set_bit(MSC_SCAN, input_dev->mscbit); - - if (ir_setkeytable(input_dev, &ir_dev->rc_tab, rc_tab)) { - rc = -ENOMEM; - goto out_table; - } - - rc = ir_register_class(input_dev); - if (rc < 0) - goto out_table; - - if (ir_dev->props) - if (ir_dev->props->driver_type == RC_DRIVER_IR_RAW) { - rc = ir_raw_event_register(input_dev); - if (rc < 0) - goto out_event; - } - - IR_dprintk(1, "Registered input device on %s for %s remote%s.\n", - driver_name, rc_tab->name, - (ir_dev->props && ir_dev->props->driver_type == RC_DRIVER_IR_RAW) ? - " in raw mode" : ""); - - /* - * Default delay of 250ms is too short for some protocols, expecially - * since the timeout is currently set to 250ms. Increase it to 500ms, - * to avoid wrong repetition of the keycodes. - */ - input_dev->rep[REP_DELAY] = 500; - - return 0; - -out_event: - ir_unregister_class(input_dev); -out_table: - kfree(ir_dev->rc_tab.scan); -out_name: - kfree(ir_dev->driver_name); -out_dev: - kfree(ir_dev); - return rc; -} -EXPORT_SYMBOL_GPL(__ir_input_register); - -/** - * ir_input_unregister() - unregisters IR and frees resources - * @input_dev: the struct input_dev descriptor of the device - - * This routine is used to free memory and de-register interfaces. - */ -void ir_input_unregister(struct input_dev *input_dev) -{ - struct ir_input_dev *ir_dev = input_get_drvdata(input_dev); - struct ir_scancode_table *rc_tab; - - if (!ir_dev) - return; - - IR_dprintk(1, "Freed keycode table\n"); - - del_timer_sync(&ir_dev->timer_keyup); - if (ir_dev->props) - if (ir_dev->props->driver_type == RC_DRIVER_IR_RAW) - ir_raw_event_unregister(input_dev); - - rc_tab = &ir_dev->rc_tab; - rc_tab->size = 0; - kfree(rc_tab->scan); - rc_tab->scan = NULL; - - ir_unregister_class(input_dev); - - kfree(ir_dev->driver_name); - kfree(ir_dev); -} -EXPORT_SYMBOL_GPL(ir_input_unregister); - -int ir_core_debug; /* ir_debug level (0,1,2) */ -EXPORT_SYMBOL_GPL(ir_core_debug); -module_param_named(debug, ir_core_debug, int, 0644); - -MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@redhat.com>"); -MODULE_LICENSE("GPL"); |