mirror of https://gitee.com/openkylin/linux.git
[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>
This commit is contained in:
Mauro Carvalho Chehab
parent
7cd4ece58f
commit
09b6d21e10
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@ -27,6 +27,7 @@ MODULE_PARM_DESC(debug, "Activates frontend debugging (default:0)");
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struct mb86a20s_state {
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struct i2c_adapter *i2c;
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const struct mb86a20s_config *config;
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u32 last_frequency;
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struct dvb_frontend frontend;
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@ -80,17 +81,26 @@ static struct regdata mb86a20s_init[] = {
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{ 0x04, 0x13 }, { 0x05, 0xff },
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{ 0x04, 0x15 }, { 0x05, 0x4e },
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{ 0x04, 0x16 }, { 0x05, 0x20 },
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{ 0x52, 0x01 },
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{ 0x50, 0xa7 }, { 0x51, 0xff },
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/*
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* On this demod, when the bit count reaches the count below,
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* it collects the bit error count. The bit counters are initialized
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* to 65535 here. This warrants that all of them will be quickly
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* calculated when device gets locked. As TMCC is parsed, the values
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* can be adjusted later in the driver's code.
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*/
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{ 0x52, 0x01 }, /* Turn on BER before Viterbi */
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{ 0x50, 0xa7 }, { 0x51, 0x00 },
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{ 0x50, 0xa8 }, { 0x51, 0xff },
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{ 0x50, 0xa9 }, { 0x51, 0xff },
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{ 0x50, 0xaa }, { 0x51, 0xff },
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{ 0x50, 0xaa }, { 0x51, 0x00 },
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{ 0x50, 0xab }, { 0x51, 0xff },
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{ 0x50, 0xac }, { 0x51, 0xff },
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{ 0x50, 0xad }, { 0x51, 0xff },
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{ 0x50, 0xad }, { 0x51, 0x00 },
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{ 0x50, 0xae }, { 0x51, 0xff },
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{ 0x50, 0xaf }, { 0x51, 0xff },
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{ 0x5e, 0x07 },
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{ 0x5e, 0x00 }, /* Turn off BER after Viterbi */
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{ 0x50, 0xdc }, { 0x51, 0x01 },
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{ 0x50, 0xdd }, { 0x51, 0xf4 },
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{ 0x50, 0xde }, { 0x51, 0x01 },
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@ -105,8 +115,8 @@ static struct regdata mb86a20s_init[] = {
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{ 0x50, 0xb6 }, { 0x51, 0xff },
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{ 0x50, 0xb7 }, { 0x51, 0xff },
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{ 0x50, 0x50 }, { 0x51, 0x02 },
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{ 0x50, 0x51 }, { 0x51, 0x04 },
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{ 0x45, 0x04 },
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{ 0x50, 0x51 }, { 0x51, 0x04 }, /* MER symbol 4 */
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{ 0x45, 0x04 }, /* CN symbol 4 */
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{ 0x48, 0x04 },
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{ 0x50, 0xd5 }, { 0x51, 0x01 }, /* Serial */
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{ 0x50, 0xd6 }, { 0x51, 0x1f },
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@ -163,12 +173,23 @@ static struct regdata mb86a20s_reset_reception[] = {
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{ 0x08, 0x00 },
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};
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static struct regdata mb86a20s_vber_reset[] = {
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{ 0x53, 0x00 }, /* VBER Counter reset */
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{ 0x53, 0x07 },
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};
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static struct regdata mb86a20s_per_reset[] = {
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{ 0x50, 0xb1 }, /* PER Counter reset */
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{ 0x51, 0x07 },
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{ 0x51, 0x00 },
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};
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/*
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* I2C read/write functions and macros
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*/
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static int mb86a20s_i2c_writereg(struct mb86a20s_state *state,
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u8 i2c_addr, int reg, int data)
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u8 i2c_addr, u8 reg, u8 data)
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{
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u8 buf[] = { reg, data };
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struct i2c_msg msg = {
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@ -230,6 +251,12 @@ static int mb86a20s_i2c_readreg(struct mb86a20s_state *state,
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mb86a20s_i2c_writeregdata(state, state->config->demod_address, \
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regdata, ARRAY_SIZE(regdata))
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/*
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* Ancillary internal routines (likely compiled inlined)
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*
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* The functions below assume that gateway lock has already obtained
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*/
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static int mb86a20s_read_status(struct dvb_frontend *fe, fe_status_t *status)
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{
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struct mb86a20s_state *state = fe->demodulator_priv;
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@ -262,42 +289,49 @@ static int mb86a20s_read_status(struct dvb_frontend *fe, fe_status_t *status)
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return 0;
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}
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static int mb86a20s_read_signal_strength(struct dvb_frontend *fe, u16 *strength)
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static int mb86a20s_read_signal_strength(struct dvb_frontend *fe)
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{
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struct mb86a20s_state *state = fe->demodulator_priv;
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int rc;
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unsigned rf_max, rf_min, rf;
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u8 val;
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if (fe->ops.i2c_gate_ctrl)
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fe->ops.i2c_gate_ctrl(fe, 0);
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/* Does a binary search to get RF strength */
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rf_max = 0xfff;
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rf_min = 0;
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do {
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rf = (rf_max + rf_min) / 2;
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mb86a20s_writereg(state, 0x04, 0x1f);
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mb86a20s_writereg(state, 0x05, rf >> 8);
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mb86a20s_writereg(state, 0x04, 0x20);
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mb86a20s_writereg(state, 0x04, rf);
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rc = mb86a20s_writereg(state, 0x04, 0x1f);
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if (rc < 0)
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return rc;
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rc = mb86a20s_writereg(state, 0x05, rf >> 8);
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if (rc < 0)
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return rc;
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rc = mb86a20s_writereg(state, 0x04, 0x20);
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if (rc < 0)
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return rc;
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rc = mb86a20s_writereg(state, 0x04, rf);
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if (rc < 0)
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return rc;
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val = mb86a20s_readreg(state, 0x02);
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if (val & 0x08)
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rc = mb86a20s_readreg(state, 0x02);
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if (rc < 0)
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return rc;
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if (rc & 0x08)
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rf_min = (rf_max + rf_min) / 2;
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else
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rf_max = (rf_max + rf_min) / 2;
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if (rf_max - rf_min < 4) {
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*strength = (((rf_max + rf_min) / 2) * 65535) / 4095;
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rf = (rf_max + rf_min) / 2;
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/* Rescale it from 2^12 (4096) to 2^16 */
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rf <<= (16 - 12);
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dev_dbg(&state->i2c->dev,
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"%s: signal strength = %d (%d < RF=%d < %d)\n",
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__func__, rf, rf_min, rf >> 4, rf_max);
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break;
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return rf;
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}
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} while (1);
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if (fe->ops.i2c_gate_ctrl)
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fe->ops.i2c_gate_ctrl(fe, 1);
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return 0;
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}
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@ -462,9 +496,6 @@ static int mb86a20s_get_frontend(struct dvb_frontend *fe)
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/* Reset frontend cache to default values */
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mb86a20s_reset_frontend_cache(fe);
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if (fe->ops.i2c_gate_ctrl)
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fe->ops.i2c_gate_ctrl(fe, 0);
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/* Check for partial reception */
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rc = mb86a20s_writereg(state, 0x6d, 0x85);
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if (rc < 0)
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@ -550,15 +581,119 @@ static int mb86a20s_get_frontend(struct dvb_frontend *fe)
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break;
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}
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}
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return 0;
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noperlayer_error:
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if (fe->ops.i2c_gate_ctrl)
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fe->ops.i2c_gate_ctrl(fe, 1);
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/* per-layer info is incomplete; discard all per-layer */
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c->isdbt_layer_enabled = 0;
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return rc;
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}
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static int mb86a20s_reset_counters(struct dvb_frontend *fe)
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{
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struct mb86a20s_state *state = fe->demodulator_priv;
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struct dtv_frontend_properties *c = &fe->dtv_property_cache;
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int rc, val;
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dev_dbg(&state->i2c->dev, "%s called.\n", __func__);
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/* Reset the counters, if the channel changed */
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if (state->last_frequency != c->frequency) {
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memset(&c->strength, 0, sizeof(c->strength));
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memset(&c->cnr, 0, sizeof(c->cnr));
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memset(&c->pre_bit_error, 0, sizeof(c->pre_bit_error));
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memset(&c->pre_bit_count, 0, sizeof(c->pre_bit_count));
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memset(&c->block_error, 0, sizeof(c->block_error));
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memset(&c->block_count, 0, sizeof(c->block_count));
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state->last_frequency = c->frequency;
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}
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/* Clear status for most stats */
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/* BER counter reset */
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rc = mb86a20s_writeregdata(state, mb86a20s_vber_reset);
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if (rc < 0)
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goto err;
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/* MER, PER counter reset */
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rc = mb86a20s_writeregdata(state, mb86a20s_per_reset);
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if (rc < 0)
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goto err;
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/* CNR counter reset */
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rc = mb86a20s_readreg(state, 0x45);
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if (rc < 0)
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goto err;
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val = rc;
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rc = mb86a20s_writereg(state, 0x45, val | 0x10);
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if (rc < 0)
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goto err;
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rc = mb86a20s_writereg(state, 0x45, val & 0x6f);
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if (rc < 0)
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goto err;
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/* MER counter reset */
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rc = mb86a20s_writereg(state, 0x50, 0x50);
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if (rc < 0)
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goto err;
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rc = mb86a20s_readreg(state, 0x51);
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if (rc < 0)
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goto err;
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val = rc;
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rc = mb86a20s_writereg(state, 0x51, val | 0x01);
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if (rc < 0)
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goto err;
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rc = mb86a20s_writereg(state, 0x51, val & 0x06);
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if (rc < 0)
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goto err;
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err:
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return rc;
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}
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static void mb86a20s_stats_not_ready(struct dvb_frontend *fe)
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{
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struct mb86a20s_state *state = fe->demodulator_priv;
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struct dtv_frontend_properties *c = &fe->dtv_property_cache;
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int i;
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dev_dbg(&state->i2c->dev, "%s called.\n", __func__);
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/* Fill the length of each status counter */
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/* Only global stats */
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c->strength.len = 1;
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/* Per-layer stats - 3 layers + global */
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c->cnr.len = 4;
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c->pre_bit_error.len = 4;
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c->pre_bit_count.len = 4;
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c->block_error.len = 4;
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c->block_count.len = 4;
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/* Signal is always available */
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c->strength.stat[0].scale = FE_SCALE_RELATIVE;
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c->strength.stat[0].uvalue = 0;
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/* Put all of them at FE_SCALE_NOT_AVAILABLE */
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for (i = 0; i < 4; i++) {
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c->cnr.stat[i].scale = FE_SCALE_NOT_AVAILABLE;
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c->pre_bit_error.stat[i].scale = FE_SCALE_NOT_AVAILABLE;
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c->pre_bit_count.stat[i].scale = FE_SCALE_NOT_AVAILABLE;
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c->block_error.stat[i].scale = FE_SCALE_NOT_AVAILABLE;
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c->block_count.stat[i].scale = FE_SCALE_NOT_AVAILABLE;
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}
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}
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/*
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* The functions below are called via DVB callbacks, so they need to
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* properly use the I2C gate control
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*/
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static int mb86a20s_initfe(struct dvb_frontend *fe)
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{
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struct mb86a20s_state *state = fe->demodulator_priv;
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@ -637,30 +772,80 @@ static int mb86a20s_set_frontend(struct dvb_frontend *fe)
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if (fe->ops.i2c_gate_ctrl)
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fe->ops.i2c_gate_ctrl(fe, 0);
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rc = mb86a20s_writeregdata(state, mb86a20s_reset_reception);
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mb86a20s_reset_counters(fe);
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if (fe->ops.i2c_gate_ctrl)
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fe->ops.i2c_gate_ctrl(fe, 1);
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return rc;
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}
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static int mb86a20s_read_status_gate(struct dvb_frontend *fe,
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fe_status_t *status)
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static int mb86a20s_read_status_and_stats(struct dvb_frontend *fe,
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fe_status_t *status)
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{
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int ret;
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struct mb86a20s_state *state = fe->demodulator_priv;
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struct dtv_frontend_properties *c = &fe->dtv_property_cache;
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int rc;
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*status = 0;
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dev_dbg(&state->i2c->dev, "%s called.\n", __func__);
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if (fe->ops.i2c_gate_ctrl)
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fe->ops.i2c_gate_ctrl(fe, 0);
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ret = mb86a20s_read_status(fe, status);
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/* Get lock */
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rc = mb86a20s_read_status(fe, status);
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if (!(*status & FE_HAS_LOCK)) {
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mb86a20s_stats_not_ready(fe);
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mb86a20s_reset_frontend_cache(fe);
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}
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if (rc < 0)
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goto error;
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/* Get signal strength */
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rc = mb86a20s_read_signal_strength(fe);
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if (rc < 0) {
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mb86a20s_stats_not_ready(fe);
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mb86a20s_reset_frontend_cache(fe);
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goto error;
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}
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/* Fill signal strength */
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c->strength.stat[0].uvalue = rc;
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if (*status & FE_HAS_LOCK) {
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/* Get TMCC info*/
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rc = mb86a20s_get_frontend(fe);
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if (rc < 0)
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goto error;
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}
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mb86a20s_stats_not_ready(fe);
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if (fe->ops.i2c_gate_ctrl)
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fe->ops.i2c_gate_ctrl(fe, 1);
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return ret;
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error:
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return rc;
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}
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static int mb86a20s_read_signal_strength_from_cache(struct dvb_frontend *fe,
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u16 *strength)
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{
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struct dtv_frontend_properties *c = &fe->dtv_property_cache;
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*strength = c->strength.stat[0].uvalue;
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return 0;
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}
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static int mb86a20s_get_frontend_dummy(struct dvb_frontend *fe)
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{
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/*
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* get_frontend is now handled together with other stats
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* retrival, when read_status() is called, as some statistics
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* will depend on the layers detection.
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*/
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return 0;
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};
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static int mb86a20s_tune(struct dvb_frontend *fe,
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bool re_tune,
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unsigned int mode_flags,
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@ -676,7 +861,7 @@ static int mb86a20s_tune(struct dvb_frontend *fe,
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rc = mb86a20s_set_frontend(fe);
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if (!(mode_flags & FE_TUNE_MODE_ONESHOT))
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mb86a20s_read_status_gate(fe, status);
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mb86a20s_read_status_and_stats(fe, status);
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return rc;
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}
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@ -759,9 +944,9 @@ static struct dvb_frontend_ops mb86a20s_ops = {
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.init = mb86a20s_initfe,
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.set_frontend = mb86a20s_set_frontend,
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.get_frontend = mb86a20s_get_frontend,
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.read_status = mb86a20s_read_status_gate,
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.read_signal_strength = mb86a20s_read_signal_strength,
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.get_frontend = mb86a20s_get_frontend_dummy,
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.read_status = mb86a20s_read_status_and_stats,
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.read_signal_strength = mb86a20s_read_signal_strength_from_cache,
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.tune = mb86a20s_tune,
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};
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