aboutsummaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
authorSean Young <sean@mess.org>2017-11-02 17:21:13 -0400
committerMauro Carvalho Chehab <mchehab@s-opensource.com>2017-12-14 09:58:36 -0500
commit47b1667bc4ac7b889c0a3bfaad327120117cb438 (patch)
tree6137430aa0d27a6de0489da11b457a34e60012a2
parent3c9ae40b087d96f80c6b6284f90a574cad4a8f25 (diff)
media: lirc: allow lirc device to be opened more than once
This makes it possible for lircd to read from a lirc chardev, and not keep it busy. Note that this changes the default for timeout reports to on. lircd already enables timeout reports when it opens a lirc device, leaving them on until the next reboot. Signed-off-by: Sean Young <sean@mess.org> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
-rw-r--r--drivers/media/rc/lirc_dev.c247
-rw-r--r--include/media/rc-core.h50
2 files changed, 165 insertions, 132 deletions
diff --git a/drivers/media/rc/lirc_dev.c b/drivers/media/rc/lirc_dev.c
index 8a0e9f74329a..7b9246fb9652 100644
--- a/drivers/media/rc/lirc_dev.c
+++ b/drivers/media/rc/lirc_dev.c
@@ -28,7 +28,6 @@
#include "rc-core-priv.h"
#include <uapi/linux/lirc.h>
-#define LOGHEAD "lirc_dev (%s[%d]): "
#define LIRCBUF_SIZE 256
static dev_t lirc_base_dev;
@@ -47,6 +46,8 @@ static struct class *lirc_class;
*/
void ir_lirc_raw_event(struct rc_dev *dev, struct ir_raw_event ev)
{
+ unsigned long flags;
+ struct lirc_fh *fh;
int sample;
/* Packet start */
@@ -75,9 +76,6 @@ void ir_lirc_raw_event(struct rc_dev *dev, struct ir_raw_event ev)
dev->gap = true;
dev->gap_duration = ev.duration;
- if (!dev->send_timeout_reports)
- return;
-
sample = LIRC_TIMEOUT(ev.duration / 1000);
IR_dprintk(2, "timeout report (duration: %d)\n", sample);
@@ -92,7 +90,11 @@ void ir_lirc_raw_event(struct rc_dev *dev, struct ir_raw_event ev)
dev->gap_duration = min_t(u64, dev->gap_duration,
LIRC_VALUE_MASK);
- kfifo_put(&dev->rawir, LIRC_SPACE(dev->gap_duration));
+ spin_lock_irqsave(&dev->lirc_fh_lock, flags);
+ list_for_each_entry(fh, &dev->lirc_fh, list)
+ kfifo_put(&fh->rawir,
+ LIRC_SPACE(dev->gap_duration));
+ spin_unlock_irqrestore(&dev->lirc_fh_lock, flags);
dev->gap = false;
}
@@ -102,22 +104,35 @@ void ir_lirc_raw_event(struct rc_dev *dev, struct ir_raw_event ev)
TO_US(ev.duration), TO_STR(ev.pulse));
}
- kfifo_put(&dev->rawir, sample);
- wake_up_poll(&dev->wait_poll, POLLIN | POLLRDNORM);
+ spin_lock_irqsave(&dev->lirc_fh_lock, flags);
+ list_for_each_entry(fh, &dev->lirc_fh, list) {
+ if (LIRC_IS_TIMEOUT(sample) && !fh->send_timeout_reports)
+ continue;
+ if (kfifo_put(&fh->rawir, sample))
+ wake_up_poll(&fh->wait_poll, POLLIN | POLLRDNORM);
+ }
+ spin_unlock_irqrestore(&dev->lirc_fh_lock, flags);
}
/**
* ir_lirc_scancode_event() - Send scancode data to lirc to be relayed to
- * userspace
+ * userspace. This can be called in atomic context.
* @dev: the struct rc_dev descriptor of the device
* @lsc: the struct lirc_scancode describing the decoded scancode
*/
void ir_lirc_scancode_event(struct rc_dev *dev, struct lirc_scancode *lsc)
{
+ unsigned long flags;
+ struct lirc_fh *fh;
+
lsc->timestamp = ktime_get_ns();
- if (kfifo_put(&dev->scancodes, *lsc))
- wake_up_poll(&dev->wait_poll, POLLIN | POLLRDNORM);
+ spin_lock_irqsave(&dev->lirc_fh_lock, flags);
+ list_for_each_entry(fh, &dev->lirc_fh, list) {
+ if (kfifo_put(&fh->scancodes, *lsc))
+ wake_up_poll(&fh->wait_poll, POLLIN | POLLRDNORM);
+ }
+ spin_unlock_irqrestore(&dev->lirc_fh_lock, flags);
}
EXPORT_SYMBOL_GPL(ir_lirc_scancode_event);
@@ -125,55 +140,88 @@ static int ir_lirc_open(struct inode *inode, struct file *file)
{
struct rc_dev *dev = container_of(inode->i_cdev, struct rc_dev,
lirc_cdev);
+ struct lirc_fh *fh = kzalloc(sizeof(*fh), GFP_KERNEL);
+ unsigned long flags;
int retval;
- retval = rc_open(dev);
- if (retval)
- return retval;
+ if (!fh)
+ return -ENOMEM;
- retval = mutex_lock_interruptible(&dev->lock);
- if (retval)
- goto out_rc;
+ get_device(&dev->dev);
if (!dev->registered) {
retval = -ENODEV;
- goto out_unlock;
+ goto out_fh;
}
- if (dev->lirc_open) {
- retval = -EBUSY;
- goto out_unlock;
+ if (dev->driver_type == RC_DRIVER_IR_RAW) {
+ if (kfifo_alloc(&fh->rawir, MAX_IR_EVENT_SIZE, GFP_KERNEL)) {
+ retval = -ENOMEM;
+ goto out_fh;
+ }
}
- if (dev->driver_type == RC_DRIVER_IR_RAW)
- kfifo_reset_out(&dev->rawir);
- if (dev->driver_type != RC_DRIVER_IR_RAW_TX)
- kfifo_reset_out(&dev->scancodes);
+ if (dev->driver_type != RC_DRIVER_IR_RAW_TX) {
+ if (kfifo_alloc(&fh->scancodes, 32, GFP_KERNEL)) {
+ retval = -ENOMEM;
+ goto out_rawir;
+ }
+ }
+
+ fh->send_mode = LIRC_MODE_PULSE;
+ fh->rc = dev;
+ fh->send_timeout_reports = true;
+
+ if (dev->driver_type == RC_DRIVER_SCANCODE)
+ fh->rec_mode = LIRC_MODE_SCANCODE;
+ else
+ fh->rec_mode = LIRC_MODE_MODE2;
+
+ retval = rc_open(dev);
+ if (retval)
+ goto out_kfifo;
+
+ init_waitqueue_head(&fh->wait_poll);
- dev->lirc_open++;
- file->private_data = dev;
+ file->private_data = fh;
+ spin_lock_irqsave(&dev->lirc_fh_lock, flags);
+ list_add(&fh->list, &dev->lirc_fh);
+ spin_unlock_irqrestore(&dev->lirc_fh_lock, flags);
nonseekable_open(inode, file);
- mutex_unlock(&dev->lock);
return 0;
+out_kfifo:
+ if (dev->driver_type != RC_DRIVER_IR_RAW_TX)
+ kfifo_free(&fh->scancodes);
+out_rawir:
+ if (dev->driver_type == RC_DRIVER_IR_RAW)
+ kfifo_free(&fh->rawir);
+out_fh:
+ kfree(fh);
+ put_device(&dev->dev);
-out_unlock:
- mutex_unlock(&dev->lock);
-out_rc:
- rc_close(dev);
return retval;
}
static int ir_lirc_close(struct inode *inode, struct file *file)
{
- struct rc_dev *dev = file->private_data;
+ struct lirc_fh *fh = file->private_data;
+ struct rc_dev *dev = fh->rc;
+ unsigned long flags;
- mutex_lock(&dev->lock);
- dev->lirc_open--;
- mutex_unlock(&dev->lock);
+ spin_lock_irqsave(&dev->lirc_fh_lock, flags);
+ list_del(&fh->list);
+ spin_unlock_irqrestore(&dev->lirc_fh_lock, flags);
+
+ if (dev->driver_type == RC_DRIVER_IR_RAW)
+ kfifo_free(&fh->rawir);
+ if (dev->driver_type != RC_DRIVER_IR_RAW_TX)
+ kfifo_free(&fh->scancodes);
+ kfree(fh);
rc_close(dev);
+ put_device(&dev->dev);
return 0;
}
@@ -181,7 +229,8 @@ static int ir_lirc_close(struct inode *inode, struct file *file)
static ssize_t ir_lirc_transmit_ir(struct file *file, const char __user *buf,
size_t n, loff_t *ppos)
{
- struct rc_dev *dev = file->private_data;
+ struct lirc_fh *fh = file->private_data;
+ struct rc_dev *dev = fh->rc;
unsigned int *txbuf = NULL;
struct ir_raw_event *raw = NULL;
ssize_t ret = -EINVAL;
@@ -201,7 +250,7 @@ static ssize_t ir_lirc_transmit_ir(struct file *file, const char __user *buf,
goto out;
}
- if (dev->send_mode == LIRC_MODE_SCANCODE) {
+ if (fh->send_mode == LIRC_MODE_SCANCODE) {
struct lirc_scancode scan;
if (n != sizeof(scan))
@@ -276,7 +325,7 @@ static ssize_t ir_lirc_transmit_ir(struct file *file, const char __user *buf,
if (ret < 0)
goto out;
- if (dev->send_mode == LIRC_MODE_SCANCODE) {
+ if (fh->send_mode == LIRC_MODE_SCANCODE) {
ret = n;
} else {
for (duration = i = 0; i < ret; i++)
@@ -303,10 +352,11 @@ out:
return ret;
}
-static long ir_lirc_ioctl(struct file *filep, unsigned int cmd,
+static long ir_lirc_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
- struct rc_dev *dev = filep->private_data;
+ struct lirc_fh *fh = file->private_data;
+ struct rc_dev *dev = fh->rc;
u32 __user *argp = (u32 __user *)(arg);
int ret = 0;
__u32 val = 0, tmp;
@@ -361,7 +411,7 @@ static long ir_lirc_ioctl(struct file *filep, unsigned int cmd,
if (dev->driver_type == RC_DRIVER_IR_RAW_TX)
return -ENOTTY;
- val = dev->rec_mode;
+ val = fh->rec_mode;
break;
case LIRC_SET_REC_MODE:
@@ -379,14 +429,14 @@ static long ir_lirc_ioctl(struct file *filep, unsigned int cmd,
break;
}
- dev->rec_mode = val;
+ fh->rec_mode = val;
return 0;
case LIRC_GET_SEND_MODE:
if (!dev->tx_ir)
return -ENOTTY;
- val = dev->send_mode;
+ val = fh->send_mode;
break;
case LIRC_SET_SEND_MODE:
@@ -396,7 +446,7 @@ static long ir_lirc_ioctl(struct file *filep, unsigned int cmd,
if (!(val == LIRC_MODE_PULSE || val == LIRC_MODE_SCANCODE))
return -EINVAL;
- dev->send_mode = val;
+ fh->send_mode = val;
return 0;
/* TX settings */
@@ -430,7 +480,7 @@ static long ir_lirc_ioctl(struct file *filep, unsigned int cmd,
return -EINVAL;
return dev->s_rx_carrier_range(dev,
- dev->carrier_low,
+ fh->carrier_low,
val);
case LIRC_SET_REC_CARRIER_RANGE:
@@ -440,7 +490,7 @@ static long ir_lirc_ioctl(struct file *filep, unsigned int cmd,
if (val <= 0)
return -EINVAL;
- dev->carrier_low = val;
+ fh->carrier_low = val;
return 0;
case LIRC_GET_REC_RESOLUTION:
@@ -498,7 +548,7 @@ static long ir_lirc_ioctl(struct file *filep, unsigned int cmd,
if (!dev->timeout)
return -ENOTTY;
- dev->send_timeout_reports = !!val;
+ fh->send_timeout_reports = !!val;
break;
default:
@@ -514,20 +564,21 @@ static long ir_lirc_ioctl(struct file *filep, unsigned int cmd,
static unsigned int ir_lirc_poll(struct file *file,
struct poll_table_struct *wait)
{
- struct rc_dev *rcdev = file->private_data;
+ struct lirc_fh *fh = file->private_data;
+ struct rc_dev *rcdev = fh->rc;
unsigned int events = 0;
- poll_wait(file, &rcdev->wait_poll, wait);
+ poll_wait(file, &fh->wait_poll, wait);
if (!rcdev->registered) {
events = POLLHUP | POLLERR;
} else if (rcdev->driver_type != RC_DRIVER_IR_RAW_TX) {
- if (rcdev->rec_mode == LIRC_MODE_SCANCODE &&
- !kfifo_is_empty(&rcdev->scancodes))
+ if (fh->rec_mode == LIRC_MODE_SCANCODE &&
+ !kfifo_is_empty(&fh->scancodes))
events = POLLIN | POLLRDNORM;
- if (rcdev->rec_mode == LIRC_MODE_MODE2 &&
- !kfifo_is_empty(&rcdev->rawir))
+ if (fh->rec_mode == LIRC_MODE_MODE2 &&
+ !kfifo_is_empty(&fh->rawir))
events = POLLIN | POLLRDNORM;
}
@@ -537,7 +588,8 @@ static unsigned int ir_lirc_poll(struct file *file,
static ssize_t ir_lirc_read_mode2(struct file *file, char __user *buffer,
size_t length)
{
- struct rc_dev *rcdev = file->private_data;
+ struct lirc_fh *fh = file->private_data;
+ struct rc_dev *rcdev = fh->rc;
unsigned int copied;
int ret;
@@ -545,12 +597,12 @@ static ssize_t ir_lirc_read_mode2(struct file *file, char __user *buffer,
return -EINVAL;
do {
- if (kfifo_is_empty(&rcdev->rawir)) {
+ if (kfifo_is_empty(&fh->rawir)) {
if (file->f_flags & O_NONBLOCK)
return -EAGAIN;
- ret = wait_event_interruptible(rcdev->wait_poll,
- !kfifo_is_empty(&rcdev->rawir) ||
+ ret = wait_event_interruptible(fh->wait_poll,
+ !kfifo_is_empty(&fh->rawir) ||
!rcdev->registered);
if (ret)
return ret;
@@ -562,7 +614,7 @@ static ssize_t ir_lirc_read_mode2(struct file *file, char __user *buffer,
ret = mutex_lock_interruptible(&rcdev->lock);
if (ret)
return ret;
- ret = kfifo_to_user(&rcdev->rawir, buffer, length, &copied);
+ ret = kfifo_to_user(&fh->rawir, buffer, length, &copied);
mutex_unlock(&rcdev->lock);
if (ret)
return ret;
@@ -574,7 +626,8 @@ static ssize_t ir_lirc_read_mode2(struct file *file, char __user *buffer,
static ssize_t ir_lirc_read_scancode(struct file *file, char __user *buffer,
size_t length)
{
- struct rc_dev *rcdev = file->private_data;
+ struct lirc_fh *fh = file->private_data;
+ struct rc_dev *rcdev = fh->rc;
unsigned int copied;
int ret;
@@ -583,12 +636,12 @@ static ssize_t ir_lirc_read_scancode(struct file *file, char __user *buffer,
return -EINVAL;
do {
- if (kfifo_is_empty(&rcdev->scancodes)) {
+ if (kfifo_is_empty(&fh->scancodes)) {
if (file->f_flags & O_NONBLOCK)
return -EAGAIN;
- ret = wait_event_interruptible(rcdev->wait_poll,
- !kfifo_is_empty(&rcdev->scancodes) ||
+ ret = wait_event_interruptible(fh->wait_poll,
+ !kfifo_is_empty(&fh->scancodes) ||
!rcdev->registered);
if (ret)
return ret;
@@ -600,7 +653,7 @@ static ssize_t ir_lirc_read_scancode(struct file *file, char __user *buffer,
ret = mutex_lock_interruptible(&rcdev->lock);
if (ret)
return ret;
- ret = kfifo_to_user(&rcdev->scancodes, buffer, length, &copied);
+ ret = kfifo_to_user(&fh->scancodes, buffer, length, &copied);
mutex_unlock(&rcdev->lock);
if (ret)
return ret;
@@ -612,7 +665,8 @@ static ssize_t ir_lirc_read_scancode(struct file *file, char __user *buffer,
static ssize_t ir_lirc_read(struct file *file, char __user *buffer,
size_t length, loff_t *ppos)
{
- struct rc_dev *rcdev = file->private_data;
+ struct lirc_fh *fh = file->private_data;
+ struct rc_dev *rcdev = fh->rc;
if (rcdev->driver_type == RC_DRIVER_IR_RAW_TX)
return -EINVAL;
@@ -620,7 +674,7 @@ static ssize_t ir_lirc_read(struct file *file, char __user *buffer,
if (!rcdev->registered)
return -ENODEV;
- if (rcdev->rec_mode == LIRC_MODE_MODE2)
+ if (fh->rec_mode == LIRC_MODE_MODE2)
return ir_lirc_read_mode2(file, buffer, length);
else /* LIRC_MODE_SCANCODE */
return ir_lirc_read_scancode(file, buffer, length);
@@ -644,11 +698,6 @@ static void lirc_release_device(struct device *ld)
{
struct rc_dev *rcdev = container_of(ld, struct rc_dev, lirc_dev);
- if (rcdev->driver_type == RC_DRIVER_IR_RAW)
- kfifo_free(&rcdev->rawir);
- if (rcdev->driver_type != RC_DRIVER_IR_RAW_TX)
- kfifo_free(&rcdev->scancodes);
-
put_device(&rcdev->dev);
}
@@ -656,40 +705,20 @@ int ir_lirc_register(struct rc_dev *dev)
{
int err, minor;
- device_initialize(&dev->lirc_dev);
- dev->lirc_dev.class = lirc_class;
- dev->lirc_dev.release = lirc_release_device;
- dev->send_mode = LIRC_MODE_PULSE;
-
- if (dev->driver_type == RC_DRIVER_SCANCODE)
- dev->rec_mode = LIRC_MODE_SCANCODE;
- else
- dev->rec_mode = LIRC_MODE_MODE2;
-
- if (dev->driver_type == RC_DRIVER_IR_RAW) {
- if (kfifo_alloc(&dev->rawir, MAX_IR_EVENT_SIZE, GFP_KERNEL))
- return -ENOMEM;
- }
-
- if (dev->driver_type != RC_DRIVER_IR_RAW_TX) {
- if (kfifo_alloc(&dev->scancodes, 32, GFP_KERNEL)) {
- kfifo_free(&dev->rawir);
- return -ENOMEM;
- }
- }
-
- init_waitqueue_head(&dev->wait_poll);
-
minor = ida_simple_get(&lirc_ida, 0, RC_DEV_MAX, GFP_KERNEL);
- if (minor < 0) {
- err = minor;
- goto out_kfifo;
- }
+ if (minor < 0)
+ return minor;
+ device_initialize(&dev->lirc_dev);
+ dev->lirc_dev.class = lirc_class;
dev->lirc_dev.parent = &dev->dev;
+ dev->lirc_dev.release = lirc_release_device;
dev->lirc_dev.devt = MKDEV(MAJOR(lirc_base_dev), minor);
dev_set_name(&dev->lirc_dev, "lirc%d", minor);
+ INIT_LIST_HEAD(&dev->lirc_fh);
+ spin_lock_init(&dev->lirc_fh_lock);
+
cdev_init(&dev->lirc_cdev, &lirc_fops);
err = cdev_device_add(&dev->lirc_cdev, &dev->lirc_dev);
@@ -705,32 +734,24 @@ int ir_lirc_register(struct rc_dev *dev)
out_ida:
ida_simple_remove(&lirc_ida, minor);
-out_kfifo:
- if (dev->driver_type == RC_DRIVER_IR_RAW)
- kfifo_free(&dev->rawir);
- if (dev->driver_type != RC_DRIVER_IR_RAW_TX)
- kfifo_free(&dev->scancodes);
return err;
}
void ir_lirc_unregister(struct rc_dev *dev)
{
+ unsigned long flags;
+ struct lirc_fh *fh;
+
dev_dbg(&dev->dev, "lirc_dev: driver %s unregistered from minor = %d\n",
dev->driver_name, MINOR(dev->lirc_dev.devt));
- mutex_lock(&dev->lock);
-
- if (dev->lirc_open) {
- dev_dbg(&dev->dev, LOGHEAD "releasing opened driver\n",
- dev->driver_name, MINOR(dev->lirc_dev.devt));
- wake_up_poll(&dev->wait_poll, POLLHUP);
- }
-
- mutex_unlock(&dev->lock);
+ spin_lock_irqsave(&dev->lirc_fh_lock, flags);
+ list_for_each_entry(fh, &dev->lirc_fh, list)
+ wake_up_poll(&fh->wait_poll, POLLHUP | POLLERR);
+ spin_unlock_irqrestore(&dev->lirc_fh_lock, flags);
cdev_device_del(&dev->lirc_cdev, &dev->lirc_dev);
ida_simple_remove(&lirc_ida, MINOR(dev->lirc_dev.devt));
- put_device(&dev->lirc_dev);
}
int __init lirc_dev_init(void)
diff --git a/include/media/rc-core.h b/include/media/rc-core.h
index fbf1648d2ec9..3a47a25a6593 100644
--- a/include/media/rc-core.h
+++ b/include/media/rc-core.h
@@ -69,6 +69,33 @@ enum rc_filter_type {
};
/**
+ * struct lirc_fh - represents an open lirc file
+ * @list: list of open file handles
+ * @rc: rcdev for this lirc chardev
+ * @carrier_low: when setting the carrier range, first the low end must be
+ * set with an ioctl and then the high end with another ioctl
+ * @send_timeout_reports: report timeouts in lirc raw IR.
+ * @rawir: queue for incoming raw IR
+ * @scancodes: queue for incoming decoded scancodes
+ * @wait_poll: poll struct for lirc device
+ * @send_mode: lirc mode for sending, either LIRC_MODE_SCANCODE or
+ * LIRC_MODE_PULSE
+ * @rec_mode: lirc mode for receiving, either LIRC_MODE_SCANCODE or
+ * LIRC_MODE_MODE2
+ */
+struct lirc_fh {
+ struct list_head list;
+ struct rc_dev *rc;
+ int carrier_low;
+ bool send_timeout_reports;
+ DECLARE_KFIFO_PTR(rawir, unsigned int);
+ DECLARE_KFIFO_PTR(scancodes, struct lirc_scancode);
+ wait_queue_head_t wait_poll;
+ u8 send_mode;
+ u8 rec_mode;
+};
+
+/**
* struct rc_dev - represents a remote control device
* @dev: driver model's view of this device
* @managed_alloc: devm_rc_allocate_device was used to create rc_dev
@@ -118,20 +145,11 @@ enum rc_filter_type {
* @tx_resolution: resolution (in ns) of output sampler
* @lirc_dev: lirc device
* @lirc_cdev: lirc char cdev
- * @lirc_open: count of the number of times the device has been opened
- * @carrier_low: when setting the carrier range, first the low end must be
- * set with an ioctl and then the high end with another ioctl
* @gap_start: time when gap starts
* @gap_duration: duration of initial gap
* @gap: true if we're in a gap
- * @send_timeout_reports: report timeouts in lirc raw IR.
- * @rawir: queue for incoming raw IR
- * @scancodes: queue for incoming decoded scancodes
- * @wait_poll: poll struct for lirc device
- * @send_mode: lirc mode for sending, either LIRC_MODE_SCANCODE or
- * LIRC_MODE_PULSE
- * @rec_mode: lirc mode for receiving, either LIRC_MODE_SCANCODE or
- * LIRC_MODE_MODE2
+ * @lirc_fh_lock: protects lirc_fh list
+ * @lirc_fh: list of open files
* @registered: set to true by rc_register_device(), false by
* rc_unregister_device
* @change_protocol: allow changing the protocol used on hardware decoders
@@ -196,17 +214,11 @@ struct rc_dev {
#ifdef CONFIG_LIRC
struct device lirc_dev;
struct cdev lirc_cdev;
- int lirc_open;
- int carrier_low;
ktime_t gap_start;
u64 gap_duration;
bool gap;
- bool send_timeout_reports;
- DECLARE_KFIFO_PTR(rawir, unsigned int);
- DECLARE_KFIFO_PTR(scancodes, struct lirc_scancode);
- wait_queue_head_t wait_poll;
- u8 send_mode;
- u8 rec_mode;
+ spinlock_t lirc_fh_lock;
+ struct list_head lirc_fh;
#endif
bool registered;
int (*change_protocol)(struct rc_dev *dev, u64 *rc_proto);

Privacy Policy