-rc-core-objs := rc-main.o rc-raw.o
+rc-core-objs := rc-main.o ir-raw.o
obj-y += keymaps/
--- /dev/null
+/* ir-raw-event.c - handle IR Pulse/Space event
+ *
+ * Copyright (C) 2010 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/kthread.h>
+#include <linux/mutex.h>
+#include <linux/sched.h>
+#include <linux/freezer.h>
+#include "rc-core-priv.h"
+
+/* Define the max number of pulse/space transitions to buffer */
+#define MAX_IR_EVENT_SIZE 512
+
+/* Used to keep track of IR raw clients, protected by ir_raw_handler_lock */
+static LIST_HEAD(ir_raw_client_list);
+
+/* Used to handle IR raw handler extensions */
+static DEFINE_MUTEX(ir_raw_handler_lock);
+static LIST_HEAD(ir_raw_handler_list);
+static u64 available_protocols;
+
+#ifdef MODULE
+/* Used to load the decoders */
+static struct work_struct wq_load;
+#endif
+
+static int ir_raw_event_thread(void *data)
+{
+ struct ir_raw_event ev;
+ struct ir_raw_handler *handler;
+ struct ir_raw_event_ctrl *raw = (struct ir_raw_event_ctrl *)data;
+ int retval;
+
+ while (!kthread_should_stop()) {
+
+ spin_lock_irq(&raw->lock);
+ retval = kfifo_out(&raw->kfifo, &ev, sizeof(ev));
+
+ if (!retval) {
+ set_current_state(TASK_INTERRUPTIBLE);
+
+ if (kthread_should_stop())
+ set_current_state(TASK_RUNNING);
+
+ spin_unlock_irq(&raw->lock);
+ schedule();
+ continue;
+ }
+
+ spin_unlock_irq(&raw->lock);
+
+
+ BUG_ON(retval != sizeof(ev));
+
+ mutex_lock(&ir_raw_handler_lock);
+ list_for_each_entry(handler, &ir_raw_handler_list, list)
+ handler->decode(raw->dev, ev);
+ raw->prev_ev = ev;
+ mutex_unlock(&ir_raw_handler_lock);
+ }
+
+ return 0;
+}
+
+/**
+ * ir_raw_event_store() - pass a pulse/space duration to the raw ir decoders
+ * @dev: the struct rc_dev device descriptor
+ * @ev: the struct ir_raw_event descriptor of the pulse/space
+ *
+ * This routine (which may be called from an interrupt context) stores a
+ * pulse/space duration for the raw ir decoding state machines. Pulses are
+ * signalled as positive values and spaces as negative values. A zero value
+ * will reset the decoding state machines.
+ */
+int ir_raw_event_store(struct rc_dev *dev, struct ir_raw_event *ev)
+{
+ if (!dev->raw)
+ return -EINVAL;
+
+ IR_dprintk(2, "sample: (%05dus %s)\n",
+ TO_US(ev->duration), TO_STR(ev->pulse));
+
+ if (kfifo_in(&dev->raw->kfifo, ev, sizeof(*ev)) != sizeof(*ev))
+ return -ENOMEM;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(ir_raw_event_store);
+
+/**
+ * ir_raw_event_store_edge() - notify raw ir decoders of the start of a pulse/space
+ * @dev: the struct rc_dev device descriptor
+ * @type: the type of the event that has occurred
+ *
+ * This routine (which may be called from an interrupt context) is used to
+ * store the beginning of an ir pulse or space (or the start/end of ir
+ * reception) for the raw ir decoding state machines. This is used by
+ * hardware which does not provide durations directly but only interrupts
+ * (or similar events) on state change.
+ */
+int ir_raw_event_store_edge(struct rc_dev *dev, enum raw_event_type type)
+{
+ ktime_t now;
+ s64 delta; /* ns */
+ struct ir_raw_event ev;
+ int rc = 0;
+
+ if (!dev->raw)
+ return -EINVAL;
+
+ now = ktime_get();
+ delta = ktime_to_ns(ktime_sub(now, dev->raw->last_event));
+
+ /* Check for a long duration since last event or if we're
+ * being called for the first time, note that delta can't
+ * possibly be negative.
+ */
+ ev.duration = 0;
+ if (delta > IR_MAX_DURATION || !dev->raw->last_type)
+ type |= IR_START_EVENT;
+ else
+ ev.duration = delta;
+
+ if (type & IR_START_EVENT)
+ ir_raw_event_reset(dev);
+ else if (dev->raw->last_type & IR_SPACE) {
+ ev.pulse = false;
+ rc = ir_raw_event_store(dev, &ev);
+ } else if (dev->raw->last_type & IR_PULSE) {
+ ev.pulse = true;
+ rc = ir_raw_event_store(dev, &ev);
+ } else
+ return 0;
+
+ dev->raw->last_event = now;
+ dev->raw->last_type = type;
+ return rc;
+}
+EXPORT_SYMBOL_GPL(ir_raw_event_store_edge);
+
+/**
+ * ir_raw_event_store_with_filter() - pass next pulse/space to decoders with some processing
+ * @dev: the struct rc_dev device descriptor
+ * @type: the type of the event that has occurred
+ *
+ * This routine (which may be called from an interrupt context) works
+ * in similiar manner to ir_raw_event_store_edge.
+ * This routine is intended for devices with limited internal buffer
+ * It automerges samples of same type, and handles timeouts
+ */
+int ir_raw_event_store_with_filter(struct rc_dev *dev, struct ir_raw_event *ev)
+{
+ if (!dev->raw)
+ return -EINVAL;
+
+ /* Ignore spaces in idle mode */
+ if (dev->idle && !ev->pulse)
+ return 0;
+ else if (dev->idle)
+ ir_raw_event_set_idle(dev, false);
+
+ if (!dev->raw->this_ev.duration)
+ dev->raw->this_ev = *ev;
+ else if (ev->pulse == dev->raw->this_ev.pulse)
+ dev->raw->this_ev.duration += ev->duration;
+ else {
+ ir_raw_event_store(dev, &dev->raw->this_ev);
+ dev->raw->this_ev = *ev;
+ }
+
+ /* Enter idle mode if nessesary */
+ if (!ev->pulse && dev->timeout &&
+ dev->raw->this_ev.duration >= dev->timeout)
+ ir_raw_event_set_idle(dev, true);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(ir_raw_event_store_with_filter);
+
+/**
+ * ir_raw_event_set_idle() - provide hint to rc-core when the device is idle or not
+ * @dev: the struct rc_dev device descriptor
+ * @idle: whether the device is idle or not
+ */
+void ir_raw_event_set_idle(struct rc_dev *dev, bool idle)
+{
+ if (!dev->raw)
+ return;
+
+ IR_dprintk(2, "%s idle mode\n", idle ? "enter" : "leave");
+
+ if (idle) {
+ dev->raw->this_ev.timeout = true;
+ ir_raw_event_store(dev, &dev->raw->this_ev);
+ init_ir_raw_event(&dev->raw->this_ev);
+ }
+
+ if (dev->s_idle)
+ dev->s_idle(dev, idle);
+
+ dev->idle = idle;
+}
+EXPORT_SYMBOL_GPL(ir_raw_event_set_idle);
+
+/**
+ * ir_raw_event_handle() - schedules the decoding of stored ir data
+ * @dev: the struct rc_dev device descriptor
+ *
+ * This routine will tell rc-core to start decoding stored ir data.
+ */
+void ir_raw_event_handle(struct rc_dev *dev)
+{
+ unsigned long flags;
+
+ if (!dev->raw)
+ return;
+
+ spin_lock_irqsave(&dev->raw->lock, flags);
+ wake_up_process(dev->raw->thread);
+ spin_unlock_irqrestore(&dev->raw->lock, flags);
+}
+EXPORT_SYMBOL_GPL(ir_raw_event_handle);
+
+/* used internally by the sysfs interface */
+u64
+ir_raw_get_allowed_protocols()
+{
+ u64 protocols;
+ mutex_lock(&ir_raw_handler_lock);
+ protocols = available_protocols;
+ mutex_unlock(&ir_raw_handler_lock);
+ return protocols;
+}
+
+/*
+ * Used to (un)register raw event clients
+ */
+int ir_raw_event_register(struct rc_dev *dev)
+{
+ int rc;
+ struct ir_raw_handler *handler;
+
+ if (!dev)
+ return -EINVAL;
+
+ dev->raw = kzalloc(sizeof(*dev->raw), GFP_KERNEL);
+ if (!dev->raw)
+ return -ENOMEM;
+
+ dev->raw->dev = dev;
+ dev->raw->enabled_protocols = ~0;
+ rc = kfifo_alloc(&dev->raw->kfifo,
+ sizeof(struct ir_raw_event) * MAX_IR_EVENT_SIZE,
+ GFP_KERNEL);
+ if (rc < 0)
+ goto out;
+
+ spin_lock_init(&dev->raw->lock);
+ dev->raw->thread = kthread_run(ir_raw_event_thread, dev->raw,
+ "rc%ld", dev->devno);
+
+ if (IS_ERR(dev->raw->thread)) {
+ rc = PTR_ERR(dev->raw->thread);
+ goto out;
+ }
+
+ mutex_lock(&ir_raw_handler_lock);
+ list_add_tail(&dev->raw->list, &ir_raw_client_list);
+ list_for_each_entry(handler, &ir_raw_handler_list, list)
+ if (handler->raw_register)
+ handler->raw_register(dev);
+ mutex_unlock(&ir_raw_handler_lock);
+
+ return 0;
+
+out:
+ kfree(dev->raw);
+ dev->raw = NULL;
+ return rc;
+}
+
+void ir_raw_event_unregister(struct rc_dev *dev)
+{
+ struct ir_raw_handler *handler;
+
+ if (!dev || !dev->raw)
+ return;
+
+ kthread_stop(dev->raw->thread);
+
+ mutex_lock(&ir_raw_handler_lock);
+ list_del(&dev->raw->list);
+ list_for_each_entry(handler, &ir_raw_handler_list, list)
+ if (handler->raw_unregister)
+ handler->raw_unregister(dev);
+ mutex_unlock(&ir_raw_handler_lock);
+
+ kfifo_free(&dev->raw->kfifo);
+ kfree(dev->raw);
+ dev->raw = NULL;
+}
+
+/*
+ * Extension interface - used to register the IR decoders
+ */
+
+int ir_raw_handler_register(struct ir_raw_handler *ir_raw_handler)
+{
+ struct ir_raw_event_ctrl *raw;
+
+ mutex_lock(&ir_raw_handler_lock);
+ list_add_tail(&ir_raw_handler->list, &ir_raw_handler_list);
+ if (ir_raw_handler->raw_register)
+ list_for_each_entry(raw, &ir_raw_client_list, list)
+ ir_raw_handler->raw_register(raw->dev);
+ available_protocols |= ir_raw_handler->protocols;
+ mutex_unlock(&ir_raw_handler_lock);
+
+ return 0;
+}
+EXPORT_SYMBOL(ir_raw_handler_register);
+
+void ir_raw_handler_unregister(struct ir_raw_handler *ir_raw_handler)
+{
+ struct ir_raw_event_ctrl *raw;
+
+ mutex_lock(&ir_raw_handler_lock);
+ list_del(&ir_raw_handler->list);
+ if (ir_raw_handler->raw_unregister)
+ list_for_each_entry(raw, &ir_raw_client_list, list)
+ ir_raw_handler->raw_unregister(raw->dev);
+ available_protocols &= ~ir_raw_handler->protocols;
+ mutex_unlock(&ir_raw_handler_lock);
+}
+EXPORT_SYMBOL(ir_raw_handler_unregister);
+
+#ifdef MODULE
+static void init_decoders(struct work_struct *work)
+{
+ /* Load the decoder modules */
+
+ load_nec_decode();
+ load_rc5_decode();
+ load_rc6_decode();
+ load_jvc_decode();
+ load_sony_decode();
+ load_lirc_codec();
+
+ /* If needed, we may later add some init code. In this case,
+ it is needed to change the CONFIG_MODULE test at rc-core.h
+ */
+}
+#endif
+
+void ir_raw_init(void)
+{
+#ifdef MODULE
+ INIT_WORK(&wq_load, init_decoders);
+ schedule_work(&wq_load);
+#endif
+}
+++ /dev/null
-/* ir-raw-event.c - handle IR Pulse/Space event
- *
- * Copyright (C) 2010 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/kthread.h>
-#include <linux/mutex.h>
-#include <linux/sched.h>
-#include <linux/freezer.h>
-#include "rc-core-priv.h"
-
-/* Define the max number of pulse/space transitions to buffer */
-#define MAX_IR_EVENT_SIZE 512
-
-/* Used to keep track of IR raw clients, protected by ir_raw_handler_lock */
-static LIST_HEAD(ir_raw_client_list);
-
-/* Used to handle IR raw handler extensions */
-static DEFINE_MUTEX(ir_raw_handler_lock);
-static LIST_HEAD(ir_raw_handler_list);
-static u64 available_protocols;
-
-#ifdef MODULE
-/* Used to load the decoders */
-static struct work_struct wq_load;
-#endif
-
-static int ir_raw_event_thread(void *data)
-{
- struct ir_raw_event ev;
- struct ir_raw_handler *handler;
- struct ir_raw_event_ctrl *raw = (struct ir_raw_event_ctrl *)data;
- int retval;
-
- while (!kthread_should_stop()) {
-
- spin_lock_irq(&raw->lock);
- retval = kfifo_out(&raw->kfifo, &ev, sizeof(ev));
-
- if (!retval) {
- set_current_state(TASK_INTERRUPTIBLE);
-
- if (kthread_should_stop())
- set_current_state(TASK_RUNNING);
-
- spin_unlock_irq(&raw->lock);
- schedule();
- continue;
- }
-
- spin_unlock_irq(&raw->lock);
-
-
- BUG_ON(retval != sizeof(ev));
-
- mutex_lock(&ir_raw_handler_lock);
- list_for_each_entry(handler, &ir_raw_handler_list, list)
- handler->decode(raw->dev, ev);
- raw->prev_ev = ev;
- mutex_unlock(&ir_raw_handler_lock);
- }
-
- return 0;
-}
-
-/**
- * ir_raw_event_store() - pass a pulse/space duration to the raw ir decoders
- * @dev: the struct rc_dev device descriptor
- * @ev: the struct ir_raw_event descriptor of the pulse/space
- *
- * This routine (which may be called from an interrupt context) stores a
- * pulse/space duration for the raw ir decoding state machines. Pulses are
- * signalled as positive values and spaces as negative values. A zero value
- * will reset the decoding state machines.
- */
-int ir_raw_event_store(struct rc_dev *dev, struct ir_raw_event *ev)
-{
- if (!dev->raw)
- return -EINVAL;
-
- IR_dprintk(2, "sample: (%05dus %s)\n",
- TO_US(ev->duration), TO_STR(ev->pulse));
-
- if (kfifo_in(&dev->raw->kfifo, ev, sizeof(*ev)) != sizeof(*ev))
- return -ENOMEM;
-
- return 0;
-}
-EXPORT_SYMBOL_GPL(ir_raw_event_store);
-
-/**
- * ir_raw_event_store_edge() - notify raw ir decoders of the start of a pulse/space
- * @dev: the struct rc_dev device descriptor
- * @type: the type of the event that has occurred
- *
- * This routine (which may be called from an interrupt context) is used to
- * store the beginning of an ir pulse or space (or the start/end of ir
- * reception) for the raw ir decoding state machines. This is used by
- * hardware which does not provide durations directly but only interrupts
- * (or similar events) on state change.
- */
-int ir_raw_event_store_edge(struct rc_dev *dev, enum raw_event_type type)
-{
- ktime_t now;
- s64 delta; /* ns */
- struct ir_raw_event ev;
- int rc = 0;
-
- if (!dev->raw)
- return -EINVAL;
-
- now = ktime_get();
- delta = ktime_to_ns(ktime_sub(now, dev->raw->last_event));
-
- /* Check for a long duration since last event or if we're
- * being called for the first time, note that delta can't
- * possibly be negative.
- */
- ev.duration = 0;
- if (delta > IR_MAX_DURATION || !dev->raw->last_type)
- type |= IR_START_EVENT;
- else
- ev.duration = delta;
-
- if (type & IR_START_EVENT)
- ir_raw_event_reset(dev);
- else if (dev->raw->last_type & IR_SPACE) {
- ev.pulse = false;
- rc = ir_raw_event_store(dev, &ev);
- } else if (dev->raw->last_type & IR_PULSE) {
- ev.pulse = true;
- rc = ir_raw_event_store(dev, &ev);
- } else
- return 0;
-
- dev->raw->last_event = now;
- dev->raw->last_type = type;
- return rc;
-}
-EXPORT_SYMBOL_GPL(ir_raw_event_store_edge);
-
-/**
- * ir_raw_event_store_with_filter() - pass next pulse/space to decoders with some processing
- * @dev: the struct rc_dev device descriptor
- * @type: the type of the event that has occurred
- *
- * This routine (which may be called from an interrupt context) works
- * in similiar manner to ir_raw_event_store_edge.
- * This routine is intended for devices with limited internal buffer
- * It automerges samples of same type, and handles timeouts
- */
-int ir_raw_event_store_with_filter(struct rc_dev *dev, struct ir_raw_event *ev)
-{
- if (!dev->raw)
- return -EINVAL;
-
- /* Ignore spaces in idle mode */
- if (dev->idle && !ev->pulse)
- return 0;
- else if (dev->idle)
- ir_raw_event_set_idle(dev, false);
-
- if (!dev->raw->this_ev.duration)
- dev->raw->this_ev = *ev;
- else if (ev->pulse == dev->raw->this_ev.pulse)
- dev->raw->this_ev.duration += ev->duration;
- else {
- ir_raw_event_store(dev, &dev->raw->this_ev);
- dev->raw->this_ev = *ev;
- }
-
- /* Enter idle mode if nessesary */
- if (!ev->pulse && dev->timeout &&
- dev->raw->this_ev.duration >= dev->timeout)
- ir_raw_event_set_idle(dev, true);
-
- return 0;
-}
-EXPORT_SYMBOL_GPL(ir_raw_event_store_with_filter);
-
-/**
- * ir_raw_event_set_idle() - provide hint to rc-core when the device is idle or not
- * @dev: the struct rc_dev device descriptor
- * @idle: whether the device is idle or not
- */
-void ir_raw_event_set_idle(struct rc_dev *dev, bool idle)
-{
- if (!dev->raw)
- return;
-
- IR_dprintk(2, "%s idle mode\n", idle ? "enter" : "leave");
-
- if (idle) {
- dev->raw->this_ev.timeout = true;
- ir_raw_event_store(dev, &dev->raw->this_ev);
- init_ir_raw_event(&dev->raw->this_ev);
- }
-
- if (dev->s_idle)
- dev->s_idle(dev, idle);
-
- dev->idle = idle;
-}
-EXPORT_SYMBOL_GPL(ir_raw_event_set_idle);
-
-/**
- * ir_raw_event_handle() - schedules the decoding of stored ir data
- * @dev: the struct rc_dev device descriptor
- *
- * This routine will tell rc-core to start decoding stored ir data.
- */
-void ir_raw_event_handle(struct rc_dev *dev)
-{
- unsigned long flags;
-
- if (!dev->raw)
- return;
-
- spin_lock_irqsave(&dev->raw->lock, flags);
- wake_up_process(dev->raw->thread);
- spin_unlock_irqrestore(&dev->raw->lock, flags);
-}
-EXPORT_SYMBOL_GPL(ir_raw_event_handle);
-
-/* used internally by the sysfs interface */
-u64
-ir_raw_get_allowed_protocols()
-{
- u64 protocols;
- mutex_lock(&ir_raw_handler_lock);
- protocols = available_protocols;
- mutex_unlock(&ir_raw_handler_lock);
- return protocols;
-}
-
-/*
- * Used to (un)register raw event clients
- */
-int ir_raw_event_register(struct rc_dev *dev)
-{
- int rc;
- struct ir_raw_handler *handler;
-
- if (!dev)
- return -EINVAL;
-
- dev->raw = kzalloc(sizeof(*dev->raw), GFP_KERNEL);
- if (!dev->raw)
- return -ENOMEM;
-
- dev->raw->dev = dev;
- dev->raw->enabled_protocols = ~0;
- rc = kfifo_alloc(&dev->raw->kfifo,
- sizeof(struct ir_raw_event) * MAX_IR_EVENT_SIZE,
- GFP_KERNEL);
- if (rc < 0)
- goto out;
-
- spin_lock_init(&dev->raw->lock);
- dev->raw->thread = kthread_run(ir_raw_event_thread, dev->raw,
- "rc%ld", dev->devno);
-
- if (IS_ERR(dev->raw->thread)) {
- rc = PTR_ERR(dev->raw->thread);
- goto out;
- }
-
- mutex_lock(&ir_raw_handler_lock);
- list_add_tail(&dev->raw->list, &ir_raw_client_list);
- list_for_each_entry(handler, &ir_raw_handler_list, list)
- if (handler->raw_register)
- handler->raw_register(dev);
- mutex_unlock(&ir_raw_handler_lock);
-
- return 0;
-
-out:
- kfree(dev->raw);
- dev->raw = NULL;
- return rc;
-}
-
-void ir_raw_event_unregister(struct rc_dev *dev)
-{
- struct ir_raw_handler *handler;
-
- if (!dev || !dev->raw)
- return;
-
- kthread_stop(dev->raw->thread);
-
- mutex_lock(&ir_raw_handler_lock);
- list_del(&dev->raw->list);
- list_for_each_entry(handler, &ir_raw_handler_list, list)
- if (handler->raw_unregister)
- handler->raw_unregister(dev);
- mutex_unlock(&ir_raw_handler_lock);
-
- kfifo_free(&dev->raw->kfifo);
- kfree(dev->raw);
- dev->raw = NULL;
-}
-
-/*
- * Extension interface - used to register the IR decoders
- */
-
-int ir_raw_handler_register(struct ir_raw_handler *ir_raw_handler)
-{
- struct ir_raw_event_ctrl *raw;
-
- mutex_lock(&ir_raw_handler_lock);
- list_add_tail(&ir_raw_handler->list, &ir_raw_handler_list);
- if (ir_raw_handler->raw_register)
- list_for_each_entry(raw, &ir_raw_client_list, list)
- ir_raw_handler->raw_register(raw->dev);
- available_protocols |= ir_raw_handler->protocols;
- mutex_unlock(&ir_raw_handler_lock);
-
- return 0;
-}
-EXPORT_SYMBOL(ir_raw_handler_register);
-
-void ir_raw_handler_unregister(struct ir_raw_handler *ir_raw_handler)
-{
- struct ir_raw_event_ctrl *raw;
-
- mutex_lock(&ir_raw_handler_lock);
- list_del(&ir_raw_handler->list);
- if (ir_raw_handler->raw_unregister)
- list_for_each_entry(raw, &ir_raw_client_list, list)
- ir_raw_handler->raw_unregister(raw->dev);
- available_protocols &= ~ir_raw_handler->protocols;
- mutex_unlock(&ir_raw_handler_lock);
-}
-EXPORT_SYMBOL(ir_raw_handler_unregister);
-
-#ifdef MODULE
-static void init_decoders(struct work_struct *work)
-{
- /* Load the decoder modules */
-
- load_nec_decode();
- load_rc5_decode();
- load_rc6_decode();
- load_jvc_decode();
- load_sony_decode();
- load_lirc_codec();
-
- /* If needed, we may later add some init code. In this case,
- it is needed to change the CONFIG_MODULE test at rc-core.h
- */
-}
-#endif
-
-void ir_raw_init(void)
-{
-#ifdef MODULE
- INIT_WORK(&wq_load, init_decoders);
- schedule_work(&wq_load);
-#endif
-}
projects / cascardo / linux.git / commitdiff