aboutsummaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
authorMauro Carvalho Chehab <mchehab@redhat.com>2013-01-22 12:28:31 -0300
committerMauro Carvalho Chehab <mchehab@redhat.com>2013-01-23 19:10:27 -0200
commit09b6d21e100a8dcda7cf5a32ecd52e8008094f72 (patch)
tree5fb6cd59ad010ef7cf684217cd08584d07500fb5
parent7cd4ece58f9b94372687de820c22cb2eae4a623e (diff)
[media] mb86a20s: calculate statistics at .read_status()
Instead of providing separate callbacks to read the several FE stats properties, the better seems to use just one method that will: - Read lock status; - Read signal strength; - if locked, get TMCC data; - if locked, get DVB statistics. As the DVB frontend thread will call this read_status callback on every 3 seconds, and userspace can even call it earlier, all stats data and layers layout will be updated together if available, with is a good thing. Reviewed-by: Antti Palosaari <crope@iki.fi> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
-rw-r--r--drivers/media/dvb-frontends/mb86a20s.c263
1 files changed, 224 insertions, 39 deletions
diff --git a/drivers/media/dvb-frontends/mb86a20s.c b/drivers/media/dvb-frontends/mb86a20s.c
index 4b3ffc418294..d7668e6292a0 100644
--- a/drivers/media/dvb-frontends/mb86a20s.c
+++ b/drivers/media/dvb-frontends/mb86a20s.c
@@ -27,6 +27,7 @@ MODULE_PARM_DESC(debug, "Activates frontend debugging (default:0)");
struct mb86a20s_state {
struct i2c_adapter *i2c;
const struct mb86a20s_config *config;
+ u32 last_frequency;
struct dvb_frontend frontend;
@@ -80,17 +81,26 @@ static struct regdata mb86a20s_init[] = {
{ 0x04, 0x13 }, { 0x05, 0xff },
{ 0x04, 0x15 }, { 0x05, 0x4e },
{ 0x04, 0x16 }, { 0x05, 0x20 },
- { 0x52, 0x01 },
- { 0x50, 0xa7 }, { 0x51, 0xff },
+
+ /*
+ * On this demod, when the bit count reaches the count below,
+ * it collects the bit error count. The bit counters are initialized
+ * to 65535 here. This warrants that all of them will be quickly
+ * calculated when device gets locked. As TMCC is parsed, the values
+ * can be adjusted later in the driver's code.
+ */
+ { 0x52, 0x01 }, /* Turn on BER before Viterbi */
+ { 0x50, 0xa7 }, { 0x51, 0x00 },
{ 0x50, 0xa8 }, { 0x51, 0xff },
{ 0x50, 0xa9 }, { 0x51, 0xff },
- { 0x50, 0xaa }, { 0x51, 0xff },
+ { 0x50, 0xaa }, { 0x51, 0x00 },
{ 0x50, 0xab }, { 0x51, 0xff },
{ 0x50, 0xac }, { 0x51, 0xff },
- { 0x50, 0xad }, { 0x51, 0xff },
+ { 0x50, 0xad }, { 0x51, 0x00 },
{ 0x50, 0xae }, { 0x51, 0xff },
{ 0x50, 0xaf }, { 0x51, 0xff },
- { 0x5e, 0x07 },
+
+ { 0x5e, 0x00 }, /* Turn off BER after Viterbi */
{ 0x50, 0xdc }, { 0x51, 0x01 },
{ 0x50, 0xdd }, { 0x51, 0xf4 },
{ 0x50, 0xde }, { 0x51, 0x01 },
@@ -105,8 +115,8 @@ static struct regdata mb86a20s_init[] = {
{ 0x50, 0xb6 }, { 0x51, 0xff },
{ 0x50, 0xb7 }, { 0x51, 0xff },
{ 0x50, 0x50 }, { 0x51, 0x02 },
- { 0x50, 0x51 }, { 0x51, 0x04 },
- { 0x45, 0x04 },
+ { 0x50, 0x51 }, { 0x51, 0x04 }, /* MER symbol 4 */
+ { 0x45, 0x04 }, /* CN symbol 4 */
{ 0x48, 0x04 },
{ 0x50, 0xd5 }, { 0x51, 0x01 }, /* Serial */
{ 0x50, 0xd6 }, { 0x51, 0x1f },
@@ -163,12 +173,23 @@ static struct regdata mb86a20s_reset_reception[] = {
{ 0x08, 0x00 },
};
+static struct regdata mb86a20s_vber_reset[] = {
+ { 0x53, 0x00 }, /* VBER Counter reset */
+ { 0x53, 0x07 },
+};
+
+static struct regdata mb86a20s_per_reset[] = {
+ { 0x50, 0xb1 }, /* PER Counter reset */
+ { 0x51, 0x07 },
+ { 0x51, 0x00 },
+};
+
/*
* I2C read/write functions and macros
*/
static int mb86a20s_i2c_writereg(struct mb86a20s_state *state,
- u8 i2c_addr, int reg, int data)
+ u8 i2c_addr, u8 reg, u8 data)
{
u8 buf[] = { reg, data };
struct i2c_msg msg = {
@@ -230,6 +251,12 @@ static int mb86a20s_i2c_readreg(struct mb86a20s_state *state,
mb86a20s_i2c_writeregdata(state, state->config->demod_address, \
regdata, ARRAY_SIZE(regdata))
+/*
+ * Ancillary internal routines (likely compiled inlined)
+ *
+ * The functions below assume that gateway lock has already obtained
+ */
+
static int mb86a20s_read_status(struct dvb_frontend *fe, fe_status_t *status)
{
struct mb86a20s_state *state = fe->demodulator_priv;
@@ -262,42 +289,49 @@ static int mb86a20s_read_status(struct dvb_frontend *fe, fe_status_t *status)
return 0;
}
-static int mb86a20s_read_signal_strength(struct dvb_frontend *fe, u16 *strength)
+static int mb86a20s_read_signal_strength(struct dvb_frontend *fe)
{
struct mb86a20s_state *state = fe->demodulator_priv;
+ int rc;
unsigned rf_max, rf_min, rf;
- u8 val;
-
- if (fe->ops.i2c_gate_ctrl)
- fe->ops.i2c_gate_ctrl(fe, 0);
/* Does a binary search to get RF strength */
rf_max = 0xfff;
rf_min = 0;
do {
rf = (rf_max + rf_min) / 2;
- mb86a20s_writereg(state, 0x04, 0x1f);
- mb86a20s_writereg(state, 0x05, rf >> 8);
- mb86a20s_writereg(state, 0x04, 0x20);
- mb86a20s_writereg(state, 0x04, rf);
+ rc = mb86a20s_writereg(state, 0x04, 0x1f);
+ if (rc < 0)
+ return rc;
+ rc = mb86a20s_writereg(state, 0x05, rf >> 8);
+ if (rc < 0)
+ return rc;
+ rc = mb86a20s_writereg(state, 0x04, 0x20);
+ if (rc < 0)
+ return rc;
+ rc = mb86a20s_writereg(state, 0x04, rf);
+ if (rc < 0)
+ return rc;
- val = mb86a20s_readreg(state, 0x02);
- if (val & 0x08)
+ rc = mb86a20s_readreg(state, 0x02);
+ if (rc < 0)
+ return rc;
+ if (rc & 0x08)
rf_min = (rf_max + rf_min) / 2;
else
rf_max = (rf_max + rf_min) / 2;
if (rf_max - rf_min < 4) {
- *strength = (((rf_max + rf_min) / 2) * 65535) / 4095;
+ rf = (rf_max + rf_min) / 2;
+
+ /* Rescale it from 2^12 (4096) to 2^16 */
+ rf <<= (16 - 12);
dev_dbg(&state->i2c->dev,
"%s: signal strength = %d (%d < RF=%d < %d)\n",
__func__, rf, rf_min, rf >> 4, rf_max);
- break;
+ return rf;
}
} while (1);
- if (fe->ops.i2c_gate_ctrl)
- fe->ops.i2c_gate_ctrl(fe, 1);
-
return 0;
}
@@ -462,9 +496,6 @@ static int mb86a20s_get_frontend(struct dvb_frontend *fe)
/* Reset frontend cache to default values */
mb86a20s_reset_frontend_cache(fe);
- if (fe->ops.i2c_gate_ctrl)
- fe->ops.i2c_gate_ctrl(fe, 0);
-
/* Check for partial reception */
rc = mb86a20s_writereg(state, 0x6d, 0x85);
if (rc < 0)
@@ -550,15 +581,119 @@ static int mb86a20s_get_frontend(struct dvb_frontend *fe)
break;
}
}
+ return 0;
noperlayer_error:
- if (fe->ops.i2c_gate_ctrl)
- fe->ops.i2c_gate_ctrl(fe, 1);
+ /* per-layer info is incomplete; discard all per-layer */
+ c->isdbt_layer_enabled = 0;
+
+ return rc;
+}
+
+static int mb86a20s_reset_counters(struct dvb_frontend *fe)
+{
+ struct mb86a20s_state *state = fe->demodulator_priv;
+ struct dtv_frontend_properties *c = &fe->dtv_property_cache;
+ int rc, val;
+
+ dev_dbg(&state->i2c->dev, "%s called.\n", __func__);
+
+ /* Reset the counters, if the channel changed */
+ if (state->last_frequency != c->frequency) {
+ memset(&c->strength, 0, sizeof(c->strength));
+ memset(&c->cnr, 0, sizeof(c->cnr));
+ memset(&c->pre_bit_error, 0, sizeof(c->pre_bit_error));
+ memset(&c->pre_bit_count, 0, sizeof(c->pre_bit_count));
+ memset(&c->block_error, 0, sizeof(c->block_error));
+ memset(&c->block_count, 0, sizeof(c->block_count));
+
+ state->last_frequency = c->frequency;
+ }
+
+ /* Clear status for most stats */
+
+ /* BER counter reset */
+ rc = mb86a20s_writeregdata(state, mb86a20s_vber_reset);
+ if (rc < 0)
+ goto err;
+
+ /* MER, PER counter reset */
+ rc = mb86a20s_writeregdata(state, mb86a20s_per_reset);
+ if (rc < 0)
+ goto err;
+
+ /* CNR counter reset */
+ rc = mb86a20s_readreg(state, 0x45);
+ if (rc < 0)
+ goto err;
+ val = rc;
+ rc = mb86a20s_writereg(state, 0x45, val | 0x10);
+ if (rc < 0)
+ goto err;
+ rc = mb86a20s_writereg(state, 0x45, val & 0x6f);
+ if (rc < 0)
+ goto err;
+
+ /* MER counter reset */
+ rc = mb86a20s_writereg(state, 0x50, 0x50);
+ if (rc < 0)
+ goto err;
+ rc = mb86a20s_readreg(state, 0x51);
+ if (rc < 0)
+ goto err;
+ val = rc;
+ rc = mb86a20s_writereg(state, 0x51, val | 0x01);
+ if (rc < 0)
+ goto err;
+ rc = mb86a20s_writereg(state, 0x51, val & 0x06);
+ if (rc < 0)
+ goto err;
+
+err:
return rc;
+}
+
+static void mb86a20s_stats_not_ready(struct dvb_frontend *fe)
+{
+ struct mb86a20s_state *state = fe->demodulator_priv;
+ struct dtv_frontend_properties *c = &fe->dtv_property_cache;
+ int i;
+
+ dev_dbg(&state->i2c->dev, "%s called.\n", __func__);
+ /* Fill the length of each status counter */
+
+ /* Only global stats */
+ c->strength.len = 1;
+
+ /* Per-layer stats - 3 layers + global */
+ c->cnr.len = 4;
+ c->pre_bit_error.len = 4;
+ c->pre_bit_count.len = 4;
+ c->block_error.len = 4;
+ c->block_count.len = 4;
+
+ /* Signal is always available */
+ c->strength.stat[0].scale = FE_SCALE_RELATIVE;
+ c->strength.stat[0].uvalue = 0;
+
+ /* Put all of them at FE_SCALE_NOT_AVAILABLE */
+ for (i = 0; i < 4; i++) {
+ c->cnr.stat[i].scale = FE_SCALE_NOT_AVAILABLE;
+ c->pre_bit_error.stat[i].scale = FE_SCALE_NOT_AVAILABLE;
+ c->pre_bit_count.stat[i].scale = FE_SCALE_NOT_AVAILABLE;
+ c->block_error.stat[i].scale = FE_SCALE_NOT_AVAILABLE;
+ c->block_count.stat[i].scale = FE_SCALE_NOT_AVAILABLE;
+ }
}
+
+/*
+ * The functions below are called via DVB callbacks, so they need to
+ * properly use the I2C gate control
+ */
+
static int mb86a20s_initfe(struct dvb_frontend *fe)
{
struct mb86a20s_state *state = fe->demodulator_priv;
@@ -637,30 +772,80 @@ static int mb86a20s_set_frontend(struct dvb_frontend *fe)
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 0);
rc = mb86a20s_writeregdata(state, mb86a20s_reset_reception);
+ mb86a20s_reset_counters(fe);
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 1);
return rc;
}
-static int mb86a20s_read_status_gate(struct dvb_frontend *fe,
- fe_status_t *status)
+static int mb86a20s_read_status_and_stats(struct dvb_frontend *fe,
+ fe_status_t *status)
{
- int ret;
+ struct mb86a20s_state *state = fe->demodulator_priv;
+ struct dtv_frontend_properties *c = &fe->dtv_property_cache;
+ int rc;
- *status = 0;
+ dev_dbg(&state->i2c->dev, "%s called.\n", __func__);
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 0);
- ret = mb86a20s_read_status(fe, status);
+ /* Get lock */
+ rc = mb86a20s_read_status(fe, status);
+ if (!(*status & FE_HAS_LOCK)) {
+ mb86a20s_stats_not_ready(fe);
+ mb86a20s_reset_frontend_cache(fe);
+ }
+ if (rc < 0)
+ goto error;
+
+ /* Get signal strength */
+ rc = mb86a20s_read_signal_strength(fe);
+ if (rc < 0) {
+ mb86a20s_stats_not_ready(fe);
+ mb86a20s_reset_frontend_cache(fe);
+ goto error;
+ }
+ /* Fill signal strength */
+ c->strength.stat[0].uvalue = rc;
+
+ if (*status & FE_HAS_LOCK) {
+ /* Get TMCC info*/
+ rc = mb86a20s_get_frontend(fe);
+ if (rc < 0)
+ goto error;
+ }
+
+ mb86a20s_stats_not_ready(fe);
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 1);
+error:
+ return rc;
+}
+
+static int mb86a20s_read_signal_strength_from_cache(struct dvb_frontend *fe,
+ u16 *strength)
+{
+ struct dtv_frontend_properties *c = &fe->dtv_property_cache;
+
+
+ *strength = c->strength.stat[0].uvalue;
- return ret;
+ return 0;
}
+static int mb86a20s_get_frontend_dummy(struct dvb_frontend *fe)
+{
+ /*
+ * get_frontend is now handled together with other stats
+ * retrival, when read_status() is called, as some statistics
+ * will depend on the layers detection.
+ */
+ return 0;
+};
+
static int mb86a20s_tune(struct dvb_frontend *fe,
bool re_tune,
unsigned int mode_flags,
@@ -676,7 +861,7 @@ static int mb86a20s_tune(struct dvb_frontend *fe,
rc = mb86a20s_set_frontend(fe);
if (!(mode_flags & FE_TUNE_MODE_ONESHOT))
- mb86a20s_read_status_gate(fe, status);
+ mb86a20s_read_status_and_stats(fe, status);
return rc;
}
@@ -759,9 +944,9 @@ static struct dvb_frontend_ops mb86a20s_ops = {
.init = mb86a20s_initfe,
.set_frontend = mb86a20s_set_frontend,
- .get_frontend = mb86a20s_get_frontend,
- .read_status = mb86a20s_read_status_gate,
- .read_signal_strength = mb86a20s_read_signal_strength,
+ .get_frontend = mb86a20s_get_frontend_dummy,
+ .read_status = mb86a20s_read_status_and_stats,
+ .read_signal_strength = mb86a20s_read_signal_strength_from_cache,
.tune = mb86a20s_tune,
};

Privacy Policy