media: lirc: implement scancode sending

This introduces a new lirc mode: scancode. Any device which can send raw IR
can now also send scancodes.

int main()
{
	int mode, fd = open("/dev/lirc0", O_RDWR);

        mode = LIRC_MODE_SCANCODE;
	if (ioctl(fd, LIRC_SET_SEND_MODE, &mode)) {
		// kernel too old or lirc does not support transmit
	}
	struct lirc_scancode scancode = {
		.scancode = 0x1e3d,
		.rc_proto = RC_PROTO_RC5,
	};
	write(fd, &scancode, sizeof(scancode));
	close(fd);
}

The other fields of lirc_scancode must be set to 0.

Note that toggle (rc5, rc6) and repeats (nec) are not implemented. Nor is
there a method for holding down a key for a period.

Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Sean Young 2017-02-25 06:51:29 -05:00 committed by Mauro Carvalho Chehab
parent 4e3cd001fd
commit 9b6192589b
4 changed files with 154 additions and 79 deletions

View File

@ -107,7 +107,8 @@ static ssize_t ir_lirc_transmit_ir(struct file *file, const char __user *buf,
{
struct lirc_codec *lirc;
struct rc_dev *dev;
unsigned int *txbuf; /* buffer with values to transmit */
unsigned int *txbuf = NULL;
struct ir_raw_event *raw = NULL;
ssize_t ret = -EINVAL;
size_t count;
ktime_t start;
@ -121,16 +122,50 @@ static ssize_t ir_lirc_transmit_ir(struct file *file, const char __user *buf,
if (!lirc)
return -EFAULT;
if (n < sizeof(unsigned) || n % sizeof(unsigned))
return -EINVAL;
if (lirc->send_mode == LIRC_MODE_SCANCODE) {
struct lirc_scancode scan;
count = n / sizeof(unsigned);
if (count > LIRCBUF_SIZE || count % 2 == 0)
return -EINVAL;
if (n != sizeof(scan))
return -EINVAL;
txbuf = memdup_user(buf, n);
if (IS_ERR(txbuf))
return PTR_ERR(txbuf);
if (copy_from_user(&scan, buf, sizeof(scan)))
return -EFAULT;
if (scan.flags || scan.keycode || scan.timestamp)
return -EINVAL;
raw = kmalloc_array(LIRCBUF_SIZE, sizeof(*raw), GFP_KERNEL);
if (!raw)
return -ENOMEM;
ret = ir_raw_encode_scancode(scan.rc_proto, scan.scancode,
raw, LIRCBUF_SIZE);
if (ret < 0)
goto out;
count = ret;
txbuf = kmalloc_array(count, sizeof(unsigned int), GFP_KERNEL);
if (!txbuf) {
ret = -ENOMEM;
goto out;
}
for (i = 0; i < count; i++)
/* Convert from NS to US */
txbuf[i] = DIV_ROUND_UP(raw[i].duration, 1000);
} else {
if (n < sizeof(unsigned int) || n % sizeof(unsigned int))
return -EINVAL;
count = n / sizeof(unsigned int);
if (count > LIRCBUF_SIZE || count % 2 == 0)
return -EINVAL;
txbuf = memdup_user(buf, n);
if (IS_ERR(txbuf))
return PTR_ERR(txbuf);
}
dev = lirc->dev;
if (!dev) {
@ -156,24 +191,30 @@ static ssize_t ir_lirc_transmit_ir(struct file *file, const char __user *buf,
if (ret < 0)
goto out;
for (duration = i = 0; i < ret; i++)
duration += txbuf[i];
if (lirc->send_mode == LIRC_MODE_SCANCODE) {
ret = n;
} else {
for (duration = i = 0; i < ret; i++)
duration += txbuf[i];
ret *= sizeof(unsigned int);
ret *= sizeof(unsigned int);
/*
* The lircd gap calculation expects the write function to
* wait for the actual IR signal to be transmitted before
* returning.
*/
towait = ktime_us_delta(ktime_add_us(start, duration), ktime_get());
if (towait > 0) {
set_current_state(TASK_INTERRUPTIBLE);
schedule_timeout(usecs_to_jiffies(towait));
/*
* The lircd gap calculation expects the write function to
* wait for the actual IR signal to be transmitted before
* returning.
*/
towait = ktime_us_delta(ktime_add_us(start, duration),
ktime_get());
if (towait > 0) {
set_current_state(TASK_INTERRUPTIBLE);
schedule_timeout(usecs_to_jiffies(towait));
}
}
out:
kfree(txbuf);
kfree(raw);
return ret;
}
@ -202,20 +243,22 @@ static long ir_lirc_ioctl(struct file *filep, unsigned int cmd,
switch (cmd) {
/* legacy support */
/* mode support */
case LIRC_GET_SEND_MODE:
if (!dev->tx_ir)
return -ENOTTY;
val = LIRC_MODE_PULSE;
val = lirc->send_mode;
break;
case LIRC_SET_SEND_MODE:
if (!dev->tx_ir)
return -ENOTTY;
if (val != LIRC_MODE_PULSE)
if (!(val == LIRC_MODE_PULSE || val == LIRC_MODE_SCANCODE))
return -EINVAL;
lirc->send_mode = val;
return 0;
/* TX settings */
@ -361,7 +404,7 @@ static int ir_lirc_register(struct rc_dev *dev)
}
if (dev->tx_ir) {
features |= LIRC_CAN_SEND_PULSE;
features |= LIRC_CAN_SEND_PULSE | LIRC_CAN_SEND_SCANCODE;
if (dev->s_tx_mask)
features |= LIRC_CAN_SET_TRANSMITTER_MASK;
if (dev->s_tx_carrier)
@ -399,6 +442,8 @@ static int ir_lirc_register(struct rc_dev *dev)
if (rc < 0)
goto out;
dev->raw->lirc.send_mode = LIRC_MODE_PULSE;
dev->raw->lirc.ldev = ldev;
dev->raw->lirc.dev = dev;
return 0;

View File

@ -103,7 +103,7 @@ struct ir_raw_event_ctrl {
u64 gap_duration;
bool gap;
bool send_timeout_reports;
u8 send_mode;
} lirc;
struct xmp_dec {
int state;

View File

@ -10,59 +10,7 @@
*/
#include <linux/input.h>
/**
* enum rc_proto - the Remote Controller protocol
*
* @RC_PROTO_UNKNOWN: Protocol not known
* @RC_PROTO_OTHER: Protocol known but proprietary
* @RC_PROTO_RC5: Philips RC5 protocol
* @RC_PROTO_RC5X_20: Philips RC5x 20 bit protocol
* @RC_PROTO_RC5_SZ: StreamZap variant of RC5
* @RC_PROTO_JVC: JVC protocol
* @RC_PROTO_SONY12: Sony 12 bit protocol
* @RC_PROTO_SONY15: Sony 15 bit protocol
* @RC_PROTO_SONY20: Sony 20 bit protocol
* @RC_PROTO_NEC: NEC protocol
* @RC_PROTO_NECX: Extended NEC protocol
* @RC_PROTO_NEC32: NEC 32 bit protocol
* @RC_PROTO_SANYO: Sanyo protocol
* @RC_PROTO_MCIR2_KBD: RC6-ish MCE keyboard
* @RC_PROTO_MCIR2_MSE: RC6-ish MCE mouse
* @RC_PROTO_RC6_0: Philips RC6-0-16 protocol
* @RC_PROTO_RC6_6A_20: Philips RC6-6A-20 protocol
* @RC_PROTO_RC6_6A_24: Philips RC6-6A-24 protocol
* @RC_PROTO_RC6_6A_32: Philips RC6-6A-32 protocol
* @RC_PROTO_RC6_MCE: MCE (Philips RC6-6A-32 subtype) protocol
* @RC_PROTO_SHARP: Sharp protocol
* @RC_PROTO_XMP: XMP protocol
* @RC_PROTO_CEC: CEC protocol
*/
enum rc_proto {
RC_PROTO_UNKNOWN = 0,
RC_PROTO_OTHER = 1,
RC_PROTO_RC5 = 2,
RC_PROTO_RC5X_20 = 3,
RC_PROTO_RC5_SZ = 4,
RC_PROTO_JVC = 5,
RC_PROTO_SONY12 = 6,
RC_PROTO_SONY15 = 7,
RC_PROTO_SONY20 = 8,
RC_PROTO_NEC = 9,
RC_PROTO_NECX = 10,
RC_PROTO_NEC32 = 11,
RC_PROTO_SANYO = 12,
RC_PROTO_MCIR2_KBD = 13,
RC_PROTO_MCIR2_MSE = 14,
RC_PROTO_RC6_0 = 15,
RC_PROTO_RC6_6A_20 = 16,
RC_PROTO_RC6_6A_24 = 17,
RC_PROTO_RC6_6A_32 = 18,
RC_PROTO_RC6_MCE = 19,
RC_PROTO_SHARP = 20,
RC_PROTO_XMP = 21,
RC_PROTO_CEC = 22,
};
#include <uapi/linux/lirc.h>
#define RC_PROTO_BIT_NONE 0ULL
#define RC_PROTO_BIT_UNKNOWN BIT_ULL(RC_PROTO_UNKNOWN)

View File

@ -47,12 +47,14 @@
#define LIRC_MODE_RAW 0x00000001
#define LIRC_MODE_PULSE 0x00000002
#define LIRC_MODE_MODE2 0x00000004
#define LIRC_MODE_SCANCODE 0x00000008
#define LIRC_MODE_LIRCCODE 0x00000010
#define LIRC_CAN_SEND_RAW LIRC_MODE2SEND(LIRC_MODE_RAW)
#define LIRC_CAN_SEND_PULSE LIRC_MODE2SEND(LIRC_MODE_PULSE)
#define LIRC_CAN_SEND_MODE2 LIRC_MODE2SEND(LIRC_MODE_MODE2)
#define LIRC_CAN_SEND_SCANCODE LIRC_MODE2SEND(LIRC_MODE_SCANCODE)
#define LIRC_CAN_SEND_LIRCCODE LIRC_MODE2SEND(LIRC_MODE_LIRCCODE)
#define LIRC_CAN_SEND_MASK 0x0000003f
@ -64,6 +66,7 @@
#define LIRC_CAN_REC_RAW LIRC_MODE2REC(LIRC_MODE_RAW)
#define LIRC_CAN_REC_PULSE LIRC_MODE2REC(LIRC_MODE_PULSE)
#define LIRC_CAN_REC_MODE2 LIRC_MODE2REC(LIRC_MODE_MODE2)
#define LIRC_CAN_REC_SCANCODE LIRC_MODE2REC(LIRC_MODE_SCANCODE)
#define LIRC_CAN_REC_LIRCCODE LIRC_MODE2REC(LIRC_MODE_LIRCCODE)
#define LIRC_CAN_REC_MASK LIRC_MODE2REC(LIRC_CAN_SEND_MASK)
@ -131,4 +134,83 @@
#define LIRC_SET_WIDEBAND_RECEIVER _IOW('i', 0x00000023, __u32)
/*
* struct lirc_scancode - decoded scancode with protocol for use with
* LIRC_MODE_SCANCODE
*
* @timestamp: Timestamp in nanoseconds using CLOCK_MONOTONIC when IR
* was decoded.
* @flags: should be 0 for transmit. When receiving scancodes,
* LIRC_SCANCODE_FLAG_TOGGLE or LIRC_SCANCODE_FLAG_REPEAT can be set
* depending on the protocol
* @rc_proto: see enum rc_proto
* @keycode: the translated keycode. Set to 0 for transmit.
* @scancode: the scancode received or to be sent
*/
struct lirc_scancode {
__u64 timestamp;
__u16 flags;
__u16 rc_proto;
__u32 keycode;
__u64 scancode;
};
/* Set if the toggle bit of rc-5 or rc-6 is enabled */
#define LIRC_SCANCODE_FLAG_TOGGLE 1
/* Set if this is a nec or sanyo repeat */
#define LIRC_SCANCODE_FLAG_REPEAT 2
/**
* enum rc_proto - the Remote Controller protocol
*
* @RC_PROTO_UNKNOWN: Protocol not known
* @RC_PROTO_OTHER: Protocol known but proprietary
* @RC_PROTO_RC5: Philips RC5 protocol
* @RC_PROTO_RC5X_20: Philips RC5x 20 bit protocol
* @RC_PROTO_RC5_SZ: StreamZap variant of RC5
* @RC_PROTO_JVC: JVC protocol
* @RC_PROTO_SONY12: Sony 12 bit protocol
* @RC_PROTO_SONY15: Sony 15 bit protocol
* @RC_PROTO_SONY20: Sony 20 bit protocol
* @RC_PROTO_NEC: NEC protocol
* @RC_PROTO_NECX: Extended NEC protocol
* @RC_PROTO_NEC32: NEC 32 bit protocol
* @RC_PROTO_SANYO: Sanyo protocol
* @RC_PROTO_MCIR2_KBD: RC6-ish MCE keyboard
* @RC_PROTO_MCIR2_MSE: RC6-ish MCE mouse
* @RC_PROTO_RC6_0: Philips RC6-0-16 protocol
* @RC_PROTO_RC6_6A_20: Philips RC6-6A-20 protocol
* @RC_PROTO_RC6_6A_24: Philips RC6-6A-24 protocol
* @RC_PROTO_RC6_6A_32: Philips RC6-6A-32 protocol
* @RC_PROTO_RC6_MCE: MCE (Philips RC6-6A-32 subtype) protocol
* @RC_PROTO_SHARP: Sharp protocol
* @RC_PROTO_XMP: XMP protocol
* @RC_PROTO_CEC: CEC protocol
*/
enum rc_proto {
RC_PROTO_UNKNOWN = 0,
RC_PROTO_OTHER = 1,
RC_PROTO_RC5 = 2,
RC_PROTO_RC5X_20 = 3,
RC_PROTO_RC5_SZ = 4,
RC_PROTO_JVC = 5,
RC_PROTO_SONY12 = 6,
RC_PROTO_SONY15 = 7,
RC_PROTO_SONY20 = 8,
RC_PROTO_NEC = 9,
RC_PROTO_NECX = 10,
RC_PROTO_NEC32 = 11,
RC_PROTO_SANYO = 12,
RC_PROTO_MCIR2_KBD = 13,
RC_PROTO_MCIR2_MSE = 14,
RC_PROTO_RC6_0 = 15,
RC_PROTO_RC6_6A_20 = 16,
RC_PROTO_RC6_6A_24 = 17,
RC_PROTO_RC6_6A_32 = 18,
RC_PROTO_RC6_MCE = 19,
RC_PROTO_SHARP = 20,
RC_PROTO_XMP = 21,
RC_PROTO_CEC = 22,
};
#endif