diff options
Diffstat (limited to 'drivers/media/dvb-frontends/cx22702.c')
| -rw-r--r-- | drivers/media/dvb-frontends/cx22702.c | 641 |
1 files changed, 641 insertions, 0 deletions
diff --git a/drivers/media/dvb-frontends/cx22702.c b/drivers/media/dvb-frontends/cx22702.c new file mode 100644 index 000000000..61ad34b70 --- /dev/null +++ b/drivers/media/dvb-frontends/cx22702.c @@ -0,0 +1,641 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + Conexant 22702 DVB OFDM demodulator driver + + based on: + Alps TDMB7 DVB OFDM demodulator driver + + Copyright (C) 2001-2002 Convergence Integrated Media GmbH + Holger Waechtler <holger@convergence.de> + + Copyright (C) 2004 Steven Toth <stoth@linuxtv.org> + + +*/ + +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/module.h> +#include <linux/string.h> +#include <linux/slab.h> +#include <linux/delay.h> +#include <media/dvb_frontend.h> +#include "cx22702.h" + +struct cx22702_state { + + struct i2c_adapter *i2c; + + /* configuration settings */ + const struct cx22702_config *config; + + struct dvb_frontend frontend; + + /* previous uncorrected block counter */ + u8 prevUCBlocks; +}; + +static int debug; +module_param(debug, int, 0644); +MODULE_PARM_DESC(debug, "Enable verbose debug messages"); + +#define dprintk if (debug) printk + +/* Register values to initialise the demod */ +static const u8 init_tab[] = { + 0x00, 0x00, /* Stop acquisition */ + 0x0B, 0x06, + 0x09, 0x01, + 0x0D, 0x41, + 0x16, 0x32, + 0x20, 0x0A, + 0x21, 0x17, + 0x24, 0x3e, + 0x26, 0xff, + 0x27, 0x10, + 0x28, 0x00, + 0x29, 0x00, + 0x2a, 0x10, + 0x2b, 0x00, + 0x2c, 0x10, + 0x2d, 0x00, + 0x48, 0xd4, + 0x49, 0x56, + 0x6b, 0x1e, + 0xc8, 0x02, + 0xf9, 0x00, + 0xfa, 0x00, + 0xfb, 0x00, + 0xfc, 0x00, + 0xfd, 0x00, +}; + +static int cx22702_writereg(struct cx22702_state *state, u8 reg, u8 data) +{ + int ret; + u8 buf[] = { reg, data }; + struct i2c_msg msg = { + .addr = state->config->demod_address, .flags = 0, + .buf = buf, .len = 2 }; + + ret = i2c_transfer(state->i2c, &msg, 1); + + if (unlikely(ret != 1)) { + printk(KERN_ERR + "%s: error (reg == 0x%02x, val == 0x%02x, ret == %i)\n", + __func__, reg, data, ret); + return -1; + } + + return 0; +} + +static u8 cx22702_readreg(struct cx22702_state *state, u8 reg) +{ + int ret; + u8 data; + + struct i2c_msg msg[] = { + { .addr = state->config->demod_address, .flags = 0, + .buf = ®, .len = 1 }, + { .addr = state->config->demod_address, .flags = I2C_M_RD, + .buf = &data, .len = 1 } }; + + ret = i2c_transfer(state->i2c, msg, 2); + + if (unlikely(ret != 2)) { + printk(KERN_ERR "%s: error (reg == 0x%02x, ret == %i)\n", + __func__, reg, ret); + return 0; + } + + return data; +} + +static int cx22702_set_inversion(struct cx22702_state *state, int inversion) +{ + u8 val; + + val = cx22702_readreg(state, 0x0C); + switch (inversion) { + case INVERSION_AUTO: + return -EOPNOTSUPP; + case INVERSION_ON: + val |= 0x01; + break; + case INVERSION_OFF: + val &= 0xfe; + break; + default: + return -EINVAL; + } + return cx22702_writereg(state, 0x0C, val); +} + +/* Retrieve the demod settings */ +static int cx22702_get_tps(struct cx22702_state *state, + struct dtv_frontend_properties *p) +{ + u8 val; + + /* Make sure the TPS regs are valid */ + if (!(cx22702_readreg(state, 0x0A) & 0x20)) + return -EAGAIN; + + val = cx22702_readreg(state, 0x01); + switch ((val & 0x18) >> 3) { + case 0: + p->modulation = QPSK; + break; + case 1: + p->modulation = QAM_16; + break; + case 2: + p->modulation = QAM_64; + break; + } + switch (val & 0x07) { + case 0: + p->hierarchy = HIERARCHY_NONE; + break; + case 1: + p->hierarchy = HIERARCHY_1; + break; + case 2: + p->hierarchy = HIERARCHY_2; + break; + case 3: + p->hierarchy = HIERARCHY_4; + break; + } + + + val = cx22702_readreg(state, 0x02); + switch ((val & 0x38) >> 3) { + case 0: + p->code_rate_HP = FEC_1_2; + break; + case 1: + p->code_rate_HP = FEC_2_3; + break; + case 2: + p->code_rate_HP = FEC_3_4; + break; + case 3: + p->code_rate_HP = FEC_5_6; + break; + case 4: + p->code_rate_HP = FEC_7_8; + break; + } + switch (val & 0x07) { + case 0: + p->code_rate_LP = FEC_1_2; + break; + case 1: + p->code_rate_LP = FEC_2_3; + break; + case 2: + p->code_rate_LP = FEC_3_4; + break; + case 3: + p->code_rate_LP = FEC_5_6; + break; + case 4: + p->code_rate_LP = FEC_7_8; + break; + } + + val = cx22702_readreg(state, 0x03); + switch ((val & 0x0c) >> 2) { + case 0: + p->guard_interval = GUARD_INTERVAL_1_32; + break; + case 1: + p->guard_interval = GUARD_INTERVAL_1_16; + break; + case 2: + p->guard_interval = GUARD_INTERVAL_1_8; + break; + case 3: + p->guard_interval = GUARD_INTERVAL_1_4; + break; + } + switch (val & 0x03) { + case 0: + p->transmission_mode = TRANSMISSION_MODE_2K; + break; + case 1: + p->transmission_mode = TRANSMISSION_MODE_8K; + break; + } + + return 0; +} + +static int cx22702_i2c_gate_ctrl(struct dvb_frontend *fe, int enable) +{ + struct cx22702_state *state = fe->demodulator_priv; + u8 val; + + dprintk("%s(%d)\n", __func__, enable); + val = cx22702_readreg(state, 0x0D); + if (enable) + val &= 0xfe; + else + val |= 0x01; + return cx22702_writereg(state, 0x0D, val); +} + +/* Talk to the demod, set the FEC, GUARD, QAM settings etc */ +static int cx22702_set_tps(struct dvb_frontend *fe) +{ + struct dtv_frontend_properties *p = &fe->dtv_property_cache; + u8 val; + struct cx22702_state *state = fe->demodulator_priv; + + if (fe->ops.tuner_ops.set_params) { + fe->ops.tuner_ops.set_params(fe); + if (fe->ops.i2c_gate_ctrl) + fe->ops.i2c_gate_ctrl(fe, 0); + } + + /* set inversion */ + cx22702_set_inversion(state, p->inversion); + + /* set bandwidth */ + val = cx22702_readreg(state, 0x0C) & 0xcf; + switch (p->bandwidth_hz) { + case 6000000: + val |= 0x20; + break; + case 7000000: + val |= 0x10; + break; + case 8000000: + break; + default: + dprintk("%s: invalid bandwidth\n", __func__); + return -EINVAL; + } + cx22702_writereg(state, 0x0C, val); + + p->code_rate_LP = FEC_AUTO; /* temp hack as manual not working */ + + /* use auto configuration? */ + if ((p->hierarchy == HIERARCHY_AUTO) || + (p->modulation == QAM_AUTO) || + (p->code_rate_HP == FEC_AUTO) || + (p->code_rate_LP == FEC_AUTO) || + (p->guard_interval == GUARD_INTERVAL_AUTO) || + (p->transmission_mode == TRANSMISSION_MODE_AUTO)) { + + /* TPS Source - use hardware driven values */ + cx22702_writereg(state, 0x06, 0x10); + cx22702_writereg(state, 0x07, 0x9); + cx22702_writereg(state, 0x08, 0xC1); + cx22702_writereg(state, 0x0B, cx22702_readreg(state, 0x0B) + & 0xfc); + cx22702_writereg(state, 0x0C, + (cx22702_readreg(state, 0x0C) & 0xBF) | 0x40); + cx22702_writereg(state, 0x00, 0x01); /* Begin acquisition */ + dprintk("%s: Autodetecting\n", __func__); + return 0; + } + + /* manually programmed values */ + switch (p->modulation) { /* mask 0x18 */ + case QPSK: + val = 0x00; + break; + case QAM_16: + val = 0x08; + break; + case QAM_64: + val = 0x10; + break; + default: + dprintk("%s: invalid modulation\n", __func__); + return -EINVAL; + } + switch (p->hierarchy) { /* mask 0x07 */ + case HIERARCHY_NONE: + break; + case HIERARCHY_1: + val |= 0x01; + break; + case HIERARCHY_2: + val |= 0x02; + break; + case HIERARCHY_4: + val |= 0x03; + break; + default: + dprintk("%s: invalid hierarchy\n", __func__); + return -EINVAL; + } + cx22702_writereg(state, 0x06, val); + + switch (p->code_rate_HP) { /* mask 0x38 */ + case FEC_NONE: + case FEC_1_2: + val = 0x00; + break; + case FEC_2_3: + val = 0x08; + break; + case FEC_3_4: + val = 0x10; + break; + case FEC_5_6: + val = 0x18; + break; + case FEC_7_8: + val = 0x20; + break; + default: + dprintk("%s: invalid code_rate_HP\n", __func__); + return -EINVAL; + } + switch (p->code_rate_LP) { /* mask 0x07 */ + case FEC_NONE: + case FEC_1_2: + break; + case FEC_2_3: + val |= 0x01; + break; + case FEC_3_4: + val |= 0x02; + break; + case FEC_5_6: + val |= 0x03; + break; + case FEC_7_8: + val |= 0x04; + break; + default: + dprintk("%s: invalid code_rate_LP\n", __func__); + return -EINVAL; + } + cx22702_writereg(state, 0x07, val); + + switch (p->guard_interval) { /* mask 0x0c */ + case GUARD_INTERVAL_1_32: + val = 0x00; + break; + case GUARD_INTERVAL_1_16: + val = 0x04; + break; + case GUARD_INTERVAL_1_8: + val = 0x08; + break; + case GUARD_INTERVAL_1_4: + val = 0x0c; + break; + default: + dprintk("%s: invalid guard_interval\n", __func__); + return -EINVAL; + } + switch (p->transmission_mode) { /* mask 0x03 */ + case TRANSMISSION_MODE_2K: + break; + case TRANSMISSION_MODE_8K: + val |= 0x1; + break; + default: + dprintk("%s: invalid transmission_mode\n", __func__); + return -EINVAL; + } + cx22702_writereg(state, 0x08, val); + cx22702_writereg(state, 0x0B, + (cx22702_readreg(state, 0x0B) & 0xfc) | 0x02); + cx22702_writereg(state, 0x0C, + (cx22702_readreg(state, 0x0C) & 0xBF) | 0x40); + + /* Begin channel acquisition */ + cx22702_writereg(state, 0x00, 0x01); + + return 0; +} + +/* Reset the demod hardware and reset all of the configuration registers + to a default state. */ +static int cx22702_init(struct dvb_frontend *fe) +{ + int i; + struct cx22702_state *state = fe->demodulator_priv; + + cx22702_writereg(state, 0x00, 0x02); + + msleep(10); + + for (i = 0; i < ARRAY_SIZE(init_tab); i += 2) + cx22702_writereg(state, init_tab[i], init_tab[i + 1]); + + cx22702_writereg(state, 0xf8, (state->config->output_mode << 1) + & 0x02); + + cx22702_i2c_gate_ctrl(fe, 0); + + return 0; +} + +static int cx22702_read_status(struct dvb_frontend *fe, enum fe_status *status) +{ + struct cx22702_state *state = fe->demodulator_priv; + u8 reg0A; + u8 reg23; + + *status = 0; + + reg0A = cx22702_readreg(state, 0x0A); + reg23 = cx22702_readreg(state, 0x23); + + dprintk("%s: status demod=0x%02x agc=0x%02x\n" + , __func__, reg0A, reg23); + + if (reg0A & 0x10) { + *status |= FE_HAS_LOCK; + *status |= FE_HAS_VITERBI; + *status |= FE_HAS_SYNC; + } + + if (reg0A & 0x20) + *status |= FE_HAS_CARRIER; + + if (reg23 < 0xf0) + *status |= FE_HAS_SIGNAL; + + return 0; +} + +static int cx22702_read_ber(struct dvb_frontend *fe, u32 *ber) +{ + struct cx22702_state *state = fe->demodulator_priv; + + if (cx22702_readreg(state, 0xE4) & 0x02) { + /* Realtime statistics */ + *ber = (cx22702_readreg(state, 0xDE) & 0x7F) << 7 + | (cx22702_readreg(state, 0xDF) & 0x7F); + } else { + /* Averagtine statistics */ + *ber = (cx22702_readreg(state, 0xDE) & 0x7F) << 7 + | cx22702_readreg(state, 0xDF); + } + + return 0; +} + +static int cx22702_read_signal_strength(struct dvb_frontend *fe, + u16 *signal_strength) +{ + struct cx22702_state *state = fe->demodulator_priv; + u8 reg23; + + /* + * Experience suggests that the strength signal register works as + * follows: + * - In the absence of signal, value is 0xff. + * - In the presence of a weak signal, bit 7 is set, not sure what + * the lower 7 bits mean. + * - In the presence of a strong signal, the register holds a 7-bit + * value (bit 7 is cleared), with greater values standing for + * weaker signals. + */ + reg23 = cx22702_readreg(state, 0x23); + if (reg23 & 0x80) { + *signal_strength = 0; + } else { + reg23 = ~reg23 & 0x7f; + /* Scale to 16 bit */ + *signal_strength = (reg23 << 9) | (reg23 << 2) | (reg23 >> 5); + } + + return 0; +} + +static int cx22702_read_snr(struct dvb_frontend *fe, u16 *snr) +{ + struct cx22702_state *state = fe->demodulator_priv; + + u16 rs_ber; + if (cx22702_readreg(state, 0xE4) & 0x02) { + /* Realtime statistics */ + rs_ber = (cx22702_readreg(state, 0xDE) & 0x7F) << 7 + | (cx22702_readreg(state, 0xDF) & 0x7F); + } else { + /* Averagine statistics */ + rs_ber = (cx22702_readreg(state, 0xDE) & 0x7F) << 8 + | cx22702_readreg(state, 0xDF); + } + *snr = ~rs_ber; + + return 0; +} + +static int cx22702_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks) +{ + struct cx22702_state *state = fe->demodulator_priv; + + u8 _ucblocks; + + /* RS Uncorrectable Packet Count then reset */ + _ucblocks = cx22702_readreg(state, 0xE3); + if (state->prevUCBlocks < _ucblocks) + *ucblocks = (_ucblocks - state->prevUCBlocks); + else + *ucblocks = state->prevUCBlocks - _ucblocks; + state->prevUCBlocks = _ucblocks; + + return 0; +} + +static int cx22702_get_frontend(struct dvb_frontend *fe, + struct dtv_frontend_properties *c) +{ + struct cx22702_state *state = fe->demodulator_priv; + + u8 reg0C = cx22702_readreg(state, 0x0C); + + c->inversion = reg0C & 0x1 ? INVERSION_ON : INVERSION_OFF; + return cx22702_get_tps(state, c); +} + +static int cx22702_get_tune_settings(struct dvb_frontend *fe, + struct dvb_frontend_tune_settings *tune) +{ + tune->min_delay_ms = 1000; + return 0; +} + +static void cx22702_release(struct dvb_frontend *fe) +{ + struct cx22702_state *state = fe->demodulator_priv; + kfree(state); +} + +static const struct dvb_frontend_ops cx22702_ops; + +struct dvb_frontend *cx22702_attach(const struct cx22702_config *config, + struct i2c_adapter *i2c) +{ + struct cx22702_state *state = NULL; + + /* allocate memory for the internal state */ + state = kzalloc(sizeof(struct cx22702_state), GFP_KERNEL); + if (state == NULL) + goto error; + + /* setup the state */ + state->config = config; + state->i2c = i2c; + + /* check if the demod is there */ + if (cx22702_readreg(state, 0x1f) != 0x3) + goto error; + + /* create dvb_frontend */ + memcpy(&state->frontend.ops, &cx22702_ops, + sizeof(struct dvb_frontend_ops)); + state->frontend.demodulator_priv = state; + return &state->frontend; + +error: + kfree(state); + return NULL; +} +EXPORT_SYMBOL_GPL(cx22702_attach); + +static const struct dvb_frontend_ops cx22702_ops = { + .delsys = { SYS_DVBT }, + .info = { + .name = "Conexant CX22702 DVB-T", + .frequency_min_hz = 177 * MHz, + .frequency_max_hz = 858 * MHz, + .frequency_stepsize_hz = 166666, + .caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 | + FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO | + FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_64 | FE_CAN_QAM_AUTO | + FE_CAN_HIERARCHY_AUTO | FE_CAN_GUARD_INTERVAL_AUTO | + FE_CAN_TRANSMISSION_MODE_AUTO | FE_CAN_RECOVER + }, + + .release = cx22702_release, + + .init = cx22702_init, + .i2c_gate_ctrl = cx22702_i2c_gate_ctrl, + + .set_frontend = cx22702_set_tps, + .get_frontend = cx22702_get_frontend, + .get_tune_settings = cx22702_get_tune_settings, + + .read_status = cx22702_read_status, + .read_ber = cx22702_read_ber, + .read_signal_strength = cx22702_read_signal_strength, + .read_snr = cx22702_read_snr, + .read_ucblocks = cx22702_read_ucblocks, +}; + +MODULE_DESCRIPTION("Conexant CX22702 DVB-T Demodulator driver"); +MODULE_AUTHOR("Steven Toth"); +MODULE_LICENSE("GPL"); |