[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>

2 files changed, 29 insertions, 11 deletions

diff --git a/drivers/media/dvb/dvb-usb/af9015.c b/drivers/media/dvb/dvb-usb/af9015.c
index 8671ca362c81..6457d042b1a0 100644
--- a/drivers/media/dvb/dvb-usb/af9015.c
+++ b/drivers/media/dvb/dvb-usb/af9015.c
@@ -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];
diff --git a/drivers/media/dvb/dvb-usb/af9015.h b/drivers/media/dvb/dvb-usb/af9015.h
index f20cfa6ed690..beb3004f00ba 100644
--- a/drivers/media/dvb/dvb-usb/af9015.h
+++ b/drivers/media/dvb/dvb-usb/af9015.h
@@ -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 {