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[media] af9015: enhance RC 

Patch from Ian Armstrong.

I've encountered a couple of problems with the current af9015 driver as
supplied with the 2.6.37 kernel, that the attached patch appears to fix. (I've
generated this patch against the current v4l-dvb git).

Some key-presses are lost. A key-press is only generated upon 'valid' data
(buf[14] == (u8) ~buf[15]), but the buffer is wiped before this check.
Sometimes the 15th byte has not been set at the time of read, so the data
isn't valid & ignored. On the next poll the 15th byte has been set, but the
rest of the data was wiped previously, so the data is still invalid & the key
is lost.

Weird repeat error, where an old key press is sometimes repeated in error. ie.
button sequence '1 (pause) 2 (pause) 3 (pause) 4' generates output like '1
(pause) 2 (pause) 23 (pause) 4'. The current driver zeroes the data for the
key pushed, but sometimes this data is already zero but with other bytes set
suggesting a repeat code. This results in the last key being incorrectly
repeated.

This patch attempts to reduce the risk of a missed key-press & also stop the
random repeat of an old key-press when a new key is pressed.

Signed-off-by: Ian Armstrong <ian@iarmst.demon.co.uk>
Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Ian Armstrong 2011-03-18 19:23:05 -03:00 committed by Mauro Carvalho Chehab
parent ce5b2acce6
commit c1e13971b1
2 changed files with 29 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

39
drivers/media/dvb/dvb-usb/af9015.c
View File

@ -479,6 +479,9 @@ static int af9015_init_endpoint(struct dvb_usb_device *d)
ret = af9015_set_reg_bit(d, 0xd50b, 0);
else
ret = af9015_clear_reg_bit(d, 0xd50b, 0);
if (ret)
goto error;
ret = af9015_write_reg(d, 0x98e9, 0xff);
error:
if (ret)
err("endpoint init failed:%d", ret);
@ -1016,22 +1019,35 @@ static int af9015_rc_query(struct dvb_usb_device *d)
{
struct af9015_state *priv = d->priv;
int ret;
u8 buf[16];
u8 buf[17];
/* read registers needed to detect remote controller code */
ret = af9015_read_regs(d, 0x98d9, buf, sizeof(buf));
if (ret)
goto error;
if (buf[14] || buf[15]) {
/* If any of these are non-zero, assume invalid data */
if (buf[1] || buf[2] || buf[3])
return ret;
/* Check for repeat of previous code */
if ((priv->rc_repeat != buf[6] || buf[0]) &&
!memcmp(&buf[12], priv->rc_last, 4)) {
deb_rc("%s: key repeated\n", __func__);
rc_keydown(d->rc_dev, priv->rc_keycode, 0);
priv->rc_repeat = buf[6];
return ret;
}
/* Only process key if canary killed */
if (buf[16] != 0xff && buf[0] != 0x01) {
/* Reset the canary */
af9015_write_reg(d, 0x98e9, 0xff);
deb_rc("%s: key pressed %02x %02x %02x %02x\n", __func__,
buf[12], buf[13], buf[14], buf[15]);
/* clean IR code from mem */
ret = af9015_write_regs(d, 0x98e5, "\x00\x00\x00\x00", 4);
if (ret)
goto error;
/* Remember this key */
memcpy(priv->rc_last, &buf[12], 4);
if (buf[14] == (u8) ~buf[15]) {
if (buf[12] == (u8) ~buf[13]) {
/* NEC */
@ -1041,15 +1057,16 @@ static int af9015_rc_query(struct dvb_usb_device *d)
priv->rc_keycode = buf[12] << 16 |
buf[13] << 8 | buf[14];
}
rc_keydown(d->rc_dev, priv->rc_keycode, 0);
} else {
priv->rc_keycode = 0; /* clear just for sure */
priv->rc_keycode = buf[12] << 24 | buf[13] << 16 |
buf[14] << 8 | buf[15];
}
} else if (priv->rc_repeat != buf[6] || buf[0]) {
deb_rc("%s: key repeated\n", __func__);
rc_keydown(d->rc_dev, priv->rc_keycode, 0);
} else {
deb_rc("%s: no key press\n", __func__);
/* Invalidate last keypress */
/* Not really needed, but helps with debug */
priv->rc_last[2] = priv->rc_last[3];
}
priv->rc_repeat = buf[6];

1
drivers/media/dvb/dvb-usb/af9015.h
View File

@ -102,6 +102,7 @@ struct af9015_state {
struct i2c_adapter i2c_adap; /* I2C adapter for 2nd FE */
u8 rc_repeat;
u32 rc_keycode;
u8 rc_last[4];
};
struct af9015_config {