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media: rc: imon decoder: support the stick 

The iMON PAD controller has a analog stick, which can be switched to
keyboard mode (cursor keys) or work as a crappy mouse.

Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
This commit is contained in:
Sean Young 2018-04-18 16:44:58 -04:00 committed by Mauro Carvalho Chehab
parent c00cb587a2
commit f9d94a10da
2 changed files with 135 additions and 3 deletions
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135
drivers/media/rc/ir-imon-decoder.c
View File

@ -31,9 +31,69 @@ enum imon_state {
STATE_INACTIVE,
STATE_BIT_CHK,
STATE_BIT_START,
STATE_FINISHED
STATE_FINISHED,
STATE_ERROR,
};
static void ir_imon_decode_scancode(struct rc_dev *dev)
{
struct imon_dec *imon = &dev->raw->imon;
/* Keyboard/Mouse toggle */
if (imon->bits == 0x299115b7)
imon->stick_keyboard = !imon->stick_keyboard;
if ((imon->bits & 0xfc0000ff) == 0x680000b7) {
int rel_x, rel_y;
u8 buf;
buf = imon->bits >> 16;
rel_x = (buf & 0x08) | (buf & 0x10) >> 2 |
(buf & 0x20) >> 4 | (buf & 0x40) >> 6;
if (imon->bits & 0x02000000)
rel_x |= ~0x0f;
buf = imon->bits >> 8;
rel_y = (buf & 0x08) | (buf & 0x10) >> 2 |
(buf & 0x20) >> 4 | (buf & 0x40) >> 6;
if (imon->bits & 0x01000000)
rel_y |= ~0x0f;
if (rel_x && rel_y && imon->stick_keyboard) {
if (abs(rel_y) > abs(rel_x))
imon->bits = rel_y > 0 ?
0x289515b7 : /* KEY_DOWN */
0x2aa515b7; /* KEY_UP */
else
imon->bits = rel_x > 0 ?
0x2ba515b7 : /* KEY_RIGHT */
0x29a515b7; /* KEY_LEFT */
}
if (!imon->stick_keyboard) {
struct lirc_scancode lsc = {
.scancode = imon->bits,
.rc_proto = RC_PROTO_IMON,
};
ir_lirc_scancode_event(dev, &lsc);
input_event(imon->idev, EV_MSC, MSC_SCAN, imon->bits);
input_report_rel(imon->idev, REL_X, rel_x);
input_report_rel(imon->idev, REL_Y, rel_y);
input_report_key(imon->idev, BTN_LEFT,
(imon->bits & 0x00010000) != 0);
input_report_key(imon->idev, BTN_RIGHT,
(imon->bits & 0x00040000) != 0);
input_sync(imon->idev);
return;
}
}
rc_keydown(dev, RC_PROTO_IMON, imon->bits, 0);
}
/**
* ir_imon_decode() - Decode one iMON pulse or space
* @dev: the struct rc_dev descriptor of the device
@ -56,6 +116,22 @@ static int ir_imon_decode(struct rc_dev *dev, struct ir_raw_event ev)
data->state, data->count, TO_US(ev.duration),
TO_STR(ev.pulse));
/*
* Since iMON protocol is a series of bits, if at any point
* we encounter an error, make sure that any remaining bits
* aren't parsed as a scancode made up of less bits.
*
* Note that if the stick is held, then the remote repeats
* the scancode with about 12ms between them. So, make sure
* we have at least 10ms of space after an error. That way,
* we're at a new scancode.
*/
if (data->state == STATE_ERROR) {
if (!ev.pulse && ev.duration > MS_TO_NS(10))
data->state = STATE_INACTIVE;
return 0;
}
for (;;) {
if (!geq_margin(ev.duration, IMON_UNIT, IMON_UNIT / 2))
return 0;
@ -95,7 +171,7 @@ static int ir_imon_decode(struct rc_dev *dev, struct ir_raw_event ev)
case STATE_FINISHED:
if (ev.pulse)
goto err_out;
rc_keydown(dev, RC_PROTO_IMON, data->bits, 0);
ir_imon_decode_scancode(dev);
data->state = STATE_INACTIVE;
break;
}
@ -107,7 +183,7 @@ err_out:
data->state, data->count, TO_US(ev.duration),
TO_STR(ev.pulse));
data->state = STATE_INACTIVE;
data->state = STATE_ERROR;
return -EINVAL;
}
@ -165,11 +241,64 @@ static int ir_imon_encode(enum rc_proto protocol, u32 scancode,
return e - events;
}
static int ir_imon_register(struct rc_dev *dev)
{
struct input_dev *idev;
struct imon_dec *imon = &dev->raw->imon;
int ret;
idev = input_allocate_device();
if (!idev)
return -ENOMEM;
snprintf(imon->name, sizeof(imon->name),
"iMON PAD Stick (%s)", dev->device_name);
idev->name = imon->name;
idev->phys = dev->input_phys;
/* Mouse bits */
set_bit(EV_REL, idev->evbit);
set_bit(EV_KEY, idev->evbit);
set_bit(REL_X, idev->relbit);
set_bit(REL_Y, idev->relbit);
set_bit(BTN_LEFT, idev->keybit);
set_bit(BTN_RIGHT, idev->keybit);
/* Report scancodes too */
set_bit(EV_MSC, idev->evbit);
set_bit(MSC_SCAN, idev->mscbit);
input_set_drvdata(idev, imon);
ret = input_register_device(idev);
if (ret < 0) {
input_free_device(idev);
return -EIO;
}
imon->idev = idev;
imon->stick_keyboard = false;
return 0;
}
static int ir_imon_unregister(struct rc_dev *dev)
{
struct imon_dec *imon = &dev->raw->imon;
input_unregister_device(imon->idev);
imon->idev = NULL;
return 0;
}
static struct ir_raw_handler imon_handler = {
.protocols = RC_PROTO_BIT_IMON,
.decode = ir_imon_decode,
.encode = ir_imon_encode,
.carrier = 38000,
.raw_register = ir_imon_register,
.raw_unregister = ir_imon_unregister,
.min_timeout = IMON_UNIT * IMON_BITS * 2,
};

3
drivers/media/rc/rc-core-priv.h
View File

@ -126,6 +126,9 @@ struct ir_raw_event_ctrl {
int count;
int last_chk;
unsigned int bits;
bool stick_keyboard;
struct input_dev *idev;
char name[64];
} imon;
};