diff options
Diffstat (limited to 'drivers/media/dvb-frontends/stv0297.c')
| -rw-r--r-- | drivers/media/dvb-frontends/stv0297.c | 713 |
1 files changed, 713 insertions, 0 deletions
diff --git a/drivers/media/dvb-frontends/stv0297.c b/drivers/media/dvb-frontends/stv0297.c new file mode 100644 index 000000000..9d4dbd99a --- /dev/null +++ b/drivers/media/dvb-frontends/stv0297.c @@ -0,0 +1,713 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + Driver for STV0297 demodulator + + Copyright (C) 2004 Andrew de Quincey <adq_dvb@lidskialf.net> + Copyright (C) 2003-2004 Dennis Noermann <dennis.noermann@noernet.de> + +*/ + +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/string.h> +#include <linux/delay.h> +#include <linux/jiffies.h> +#include <linux/slab.h> + +#include <media/dvb_frontend.h> +#include "stv0297.h" + +struct stv0297_state { + struct i2c_adapter *i2c; + const struct stv0297_config *config; + struct dvb_frontend frontend; + + unsigned long last_ber; + unsigned long base_freq; +}; + +#if 1 +#define dprintk(x...) printk(x) +#else +#define dprintk(x...) +#endif + +#define STV0297_CLOCK_KHZ 28900 + + +static int stv0297_writereg(struct stv0297_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 (ret != 1) + dprintk("%s: writereg error (reg == 0x%02x, val == 0x%02x, ret == %i)\n", + __func__, reg, data, ret); + + return (ret != 1) ? -1 : 0; +} + +static int stv0297_readreg(struct stv0297_state *state, u8 reg) +{ + int ret; + u8 b0[] = { reg }; + u8 b1[] = { 0 }; + struct i2c_msg msg[] = { {.addr = state->config->demod_address,.flags = 0,.buf = b0,.len = 1}, + {.addr = state->config->demod_address,.flags = I2C_M_RD,.buf = b1,.len = 1} + }; + + // this device needs a STOP between the register and data + if (state->config->stop_during_read) { + if ((ret = i2c_transfer(state->i2c, &msg[0], 1)) != 1) { + dprintk("%s: readreg error (reg == 0x%02x, ret == %i)\n", __func__, reg, ret); + return -1; + } + if ((ret = i2c_transfer(state->i2c, &msg[1], 1)) != 1) { + dprintk("%s: readreg error (reg == 0x%02x, ret == %i)\n", __func__, reg, ret); + return -1; + } + } else { + if ((ret = i2c_transfer(state->i2c, msg, 2)) != 2) { + dprintk("%s: readreg error (reg == 0x%02x, ret == %i)\n", __func__, reg, ret); + return -1; + } + } + + return b1[0]; +} + +static int stv0297_writereg_mask(struct stv0297_state *state, u8 reg, u8 mask, u8 data) +{ + int val; + + val = stv0297_readreg(state, reg); + val &= ~mask; + val |= (data & mask); + stv0297_writereg(state, reg, val); + + return 0; +} + +static int stv0297_readregs(struct stv0297_state *state, u8 reg1, u8 * b, u8 len) +{ + int ret; + struct i2c_msg msg[] = { {.addr = state->config->demod_address,.flags = 0,.buf = + ®1,.len = 1}, + {.addr = state->config->demod_address,.flags = I2C_M_RD,.buf = b,.len = len} + }; + + // this device needs a STOP between the register and data + if (state->config->stop_during_read) { + if ((ret = i2c_transfer(state->i2c, &msg[0], 1)) != 1) { + dprintk("%s: readreg error (reg == 0x%02x, ret == %i)\n", __func__, reg1, ret); + return -1; + } + if ((ret = i2c_transfer(state->i2c, &msg[1], 1)) != 1) { + dprintk("%s: readreg error (reg == 0x%02x, ret == %i)\n", __func__, reg1, ret); + return -1; + } + } else { + if ((ret = i2c_transfer(state->i2c, msg, 2)) != 2) { + dprintk("%s: readreg error (reg == 0x%02x, ret == %i)\n", __func__, reg1, ret); + return -1; + } + } + + return 0; +} + +static u32 stv0297_get_symbolrate(struct stv0297_state *state) +{ + u64 tmp; + + tmp = (u64)(stv0297_readreg(state, 0x55) + | (stv0297_readreg(state, 0x56) << 8) + | (stv0297_readreg(state, 0x57) << 16) + | (stv0297_readreg(state, 0x58) << 24)); + + tmp *= STV0297_CLOCK_KHZ; + tmp >>= 32; + + return (u32) tmp; +} + +static void stv0297_set_symbolrate(struct stv0297_state *state, u32 srate) +{ + long tmp; + + tmp = 131072L * srate; /* 131072 = 2^17 */ + tmp = tmp / (STV0297_CLOCK_KHZ / 4); /* 1/4 = 2^-2 */ + tmp = tmp * 8192L; /* 8192 = 2^13 */ + + stv0297_writereg(state, 0x55, (unsigned char) (tmp & 0xFF)); + stv0297_writereg(state, 0x56, (unsigned char) (tmp >> 8)); + stv0297_writereg(state, 0x57, (unsigned char) (tmp >> 16)); + stv0297_writereg(state, 0x58, (unsigned char) (tmp >> 24)); +} + +static void stv0297_set_sweeprate(struct stv0297_state *state, short fshift, long symrate) +{ + long tmp; + + tmp = (long) fshift *262144L; /* 262144 = 2*18 */ + tmp /= symrate; + tmp *= 1024; /* 1024 = 2*10 */ + + // adjust + if (tmp >= 0) { + tmp += 500000; + } else { + tmp -= 500000; + } + tmp /= 1000000; + + stv0297_writereg(state, 0x60, tmp & 0xFF); + stv0297_writereg_mask(state, 0x69, 0xF0, (tmp >> 4) & 0xf0); +} + +static void stv0297_set_carrieroffset(struct stv0297_state *state, long offset) +{ + long tmp; + + /* symrate is hardcoded to 10000 */ + tmp = offset * 26844L; /* (2**28)/10000 */ + if (tmp < 0) + tmp += 0x10000000; + tmp &= 0x0FFFFFFF; + + stv0297_writereg(state, 0x66, (unsigned char) (tmp & 0xFF)); + stv0297_writereg(state, 0x67, (unsigned char) (tmp >> 8)); + stv0297_writereg(state, 0x68, (unsigned char) (tmp >> 16)); + stv0297_writereg_mask(state, 0x69, 0x0F, (tmp >> 24) & 0x0f); +} + +/* +static long stv0297_get_carrieroffset(struct stv0297_state *state) +{ + s64 tmp; + + stv0297_writereg(state, 0x6B, 0x00); + + tmp = stv0297_readreg(state, 0x66); + tmp |= (stv0297_readreg(state, 0x67) << 8); + tmp |= (stv0297_readreg(state, 0x68) << 16); + tmp |= (stv0297_readreg(state, 0x69) & 0x0F) << 24; + + tmp *= stv0297_get_symbolrate(state); + tmp >>= 28; + + return (s32) tmp; +} +*/ + +static void stv0297_set_initialdemodfreq(struct stv0297_state *state, long freq) +{ + s32 tmp; + + if (freq > 10000) + freq -= STV0297_CLOCK_KHZ; + + tmp = (STV0297_CLOCK_KHZ * 1000) / (1 << 16); + tmp = (freq * 1000) / tmp; + if (tmp > 0xffff) + tmp = 0xffff; + + stv0297_writereg_mask(state, 0x25, 0x80, 0x80); + stv0297_writereg(state, 0x21, tmp >> 8); + stv0297_writereg(state, 0x20, tmp); +} + +static int stv0297_set_qam(struct stv0297_state *state, + enum fe_modulation modulation) +{ + int val = 0; + + switch (modulation) { + case QAM_16: + val = 0; + break; + + case QAM_32: + val = 1; + break; + + case QAM_64: + val = 4; + break; + + case QAM_128: + val = 2; + break; + + case QAM_256: + val = 3; + break; + + default: + return -EINVAL; + } + + stv0297_writereg_mask(state, 0x00, 0x70, val << 4); + + return 0; +} + +static int stv0297_set_inversion(struct stv0297_state *state, + enum fe_spectral_inversion inversion) +{ + int val = 0; + + switch (inversion) { + case INVERSION_OFF: + val = 0; + break; + + case INVERSION_ON: + val = 1; + break; + + default: + return -EINVAL; + } + + stv0297_writereg_mask(state, 0x83, 0x08, val << 3); + + return 0; +} + +static int stv0297_i2c_gate_ctrl(struct dvb_frontend *fe, int enable) +{ + struct stv0297_state *state = fe->demodulator_priv; + + if (enable) { + stv0297_writereg(state, 0x87, 0x78); + stv0297_writereg(state, 0x86, 0xc8); + } + + return 0; +} + +static int stv0297_init(struct dvb_frontend *fe) +{ + struct stv0297_state *state = fe->demodulator_priv; + int i; + + /* load init table */ + for (i=0; !(state->config->inittab[i] == 0xff && state->config->inittab[i+1] == 0xff); i+=2) + stv0297_writereg(state, state->config->inittab[i], state->config->inittab[i+1]); + msleep(200); + + state->last_ber = 0; + + return 0; +} + +static int stv0297_sleep(struct dvb_frontend *fe) +{ + struct stv0297_state *state = fe->demodulator_priv; + + stv0297_writereg_mask(state, 0x80, 1, 1); + + return 0; +} + +static int stv0297_read_status(struct dvb_frontend *fe, + enum fe_status *status) +{ + struct stv0297_state *state = fe->demodulator_priv; + + u8 sync = stv0297_readreg(state, 0xDF); + + *status = 0; + if (sync & 0x80) + *status |= + FE_HAS_SYNC | FE_HAS_SIGNAL | FE_HAS_CARRIER | FE_HAS_VITERBI | FE_HAS_LOCK; + return 0; +} + +static int stv0297_read_ber(struct dvb_frontend *fe, u32 * ber) +{ + struct stv0297_state *state = fe->demodulator_priv; + u8 BER[3]; + + stv0297_readregs(state, 0xA0, BER, 3); + if (!(BER[0] & 0x80)) { + state->last_ber = BER[2] << 8 | BER[1]; + stv0297_writereg_mask(state, 0xA0, 0x80, 0x80); + } + + *ber = state->last_ber; + + return 0; +} + + +static int stv0297_read_signal_strength(struct dvb_frontend *fe, u16 * strength) +{ + struct stv0297_state *state = fe->demodulator_priv; + u8 STRENGTH[3]; + u16 tmp; + + stv0297_readregs(state, 0x41, STRENGTH, 3); + tmp = (STRENGTH[1] & 0x03) << 8 | STRENGTH[0]; + if (STRENGTH[2] & 0x20) { + if (tmp < 0x200) + tmp = 0; + else + tmp = tmp - 0x200; + } else { + if (tmp > 0x1ff) + tmp = 0; + else + tmp = 0x1ff - tmp; + } + *strength = (tmp << 7) | (tmp >> 2); + return 0; +} + +static int stv0297_read_snr(struct dvb_frontend *fe, u16 * snr) +{ + struct stv0297_state *state = fe->demodulator_priv; + u8 SNR[2]; + + stv0297_readregs(state, 0x07, SNR, 2); + *snr = SNR[1] << 8 | SNR[0]; + + return 0; +} + +static int stv0297_read_ucblocks(struct dvb_frontend *fe, u32 * ucblocks) +{ + struct stv0297_state *state = fe->demodulator_priv; + + stv0297_writereg_mask(state, 0xDF, 0x03, 0x03); /* freeze the counters */ + + *ucblocks = (stv0297_readreg(state, 0xD5) << 8) + | stv0297_readreg(state, 0xD4); + + stv0297_writereg_mask(state, 0xDF, 0x03, 0x02); /* clear the counters */ + stv0297_writereg_mask(state, 0xDF, 0x03, 0x01); /* re-enable the counters */ + + return 0; +} + +static int stv0297_set_frontend(struct dvb_frontend *fe) +{ + struct dtv_frontend_properties *p = &fe->dtv_property_cache; + struct stv0297_state *state = fe->demodulator_priv; + int u_threshold; + int initial_u; + int blind_u; + int delay; + int sweeprate; + int carrieroffset; + unsigned long timeout; + enum fe_spectral_inversion inversion; + + switch (p->modulation) { + case QAM_16: + case QAM_32: + case QAM_64: + delay = 100; + sweeprate = 1000; + break; + + case QAM_128: + case QAM_256: + delay = 200; + sweeprate = 500; + break; + + default: + return -EINVAL; + } + + // determine inversion dependent parameters + inversion = p->inversion; + if (state->config->invert) + inversion = (inversion == INVERSION_ON) ? INVERSION_OFF : INVERSION_ON; + carrieroffset = -330; + switch (inversion) { + case INVERSION_OFF: + break; + + case INVERSION_ON: + sweeprate = -sweeprate; + carrieroffset = -carrieroffset; + break; + + default: + return -EINVAL; + } + + stv0297_init(fe); + 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); + } + + /* clear software interrupts */ + stv0297_writereg(state, 0x82, 0x0); + + /* set initial demodulation frequency */ + stv0297_set_initialdemodfreq(state, 7250); + + /* setup AGC */ + stv0297_writereg_mask(state, 0x43, 0x10, 0x00); + stv0297_writereg(state, 0x41, 0x00); + stv0297_writereg_mask(state, 0x42, 0x03, 0x01); + stv0297_writereg_mask(state, 0x36, 0x60, 0x00); + stv0297_writereg_mask(state, 0x36, 0x18, 0x00); + stv0297_writereg_mask(state, 0x71, 0x80, 0x80); + stv0297_writereg(state, 0x72, 0x00); + stv0297_writereg(state, 0x73, 0x00); + stv0297_writereg_mask(state, 0x74, 0x0F, 0x00); + stv0297_writereg_mask(state, 0x43, 0x08, 0x00); + stv0297_writereg_mask(state, 0x71, 0x80, 0x00); + + /* setup STL */ + stv0297_writereg_mask(state, 0x5a, 0x20, 0x20); + stv0297_writereg_mask(state, 0x5b, 0x02, 0x02); + stv0297_writereg_mask(state, 0x5b, 0x02, 0x00); + stv0297_writereg_mask(state, 0x5b, 0x01, 0x00); + stv0297_writereg_mask(state, 0x5a, 0x40, 0x40); + + /* disable frequency sweep */ + stv0297_writereg_mask(state, 0x6a, 0x01, 0x00); + + /* reset deinterleaver */ + stv0297_writereg_mask(state, 0x81, 0x01, 0x01); + stv0297_writereg_mask(state, 0x81, 0x01, 0x00); + + /* ??? */ + stv0297_writereg_mask(state, 0x83, 0x20, 0x20); + stv0297_writereg_mask(state, 0x83, 0x20, 0x00); + + /* reset equaliser */ + u_threshold = stv0297_readreg(state, 0x00) & 0xf; + initial_u = stv0297_readreg(state, 0x01) >> 4; + blind_u = stv0297_readreg(state, 0x01) & 0xf; + stv0297_writereg_mask(state, 0x84, 0x01, 0x01); + stv0297_writereg_mask(state, 0x84, 0x01, 0x00); + stv0297_writereg_mask(state, 0x00, 0x0f, u_threshold); + stv0297_writereg_mask(state, 0x01, 0xf0, initial_u << 4); + stv0297_writereg_mask(state, 0x01, 0x0f, blind_u); + + /* data comes from internal A/D */ + stv0297_writereg_mask(state, 0x87, 0x80, 0x00); + + /* clear phase registers */ + stv0297_writereg(state, 0x63, 0x00); + stv0297_writereg(state, 0x64, 0x00); + stv0297_writereg(state, 0x65, 0x00); + stv0297_writereg(state, 0x66, 0x00); + stv0297_writereg(state, 0x67, 0x00); + stv0297_writereg(state, 0x68, 0x00); + stv0297_writereg_mask(state, 0x69, 0x0f, 0x00); + + /* set parameters */ + stv0297_set_qam(state, p->modulation); + stv0297_set_symbolrate(state, p->symbol_rate / 1000); + stv0297_set_sweeprate(state, sweeprate, p->symbol_rate / 1000); + stv0297_set_carrieroffset(state, carrieroffset); + stv0297_set_inversion(state, inversion); + + /* kick off lock */ + /* Disable corner detection for higher QAMs */ + if (p->modulation == QAM_128 || + p->modulation == QAM_256) + stv0297_writereg_mask(state, 0x88, 0x08, 0x00); + else + stv0297_writereg_mask(state, 0x88, 0x08, 0x08); + + stv0297_writereg_mask(state, 0x5a, 0x20, 0x00); + stv0297_writereg_mask(state, 0x6a, 0x01, 0x01); + stv0297_writereg_mask(state, 0x43, 0x40, 0x40); + stv0297_writereg_mask(state, 0x5b, 0x30, 0x00); + stv0297_writereg_mask(state, 0x03, 0x0c, 0x0c); + stv0297_writereg_mask(state, 0x03, 0x03, 0x03); + stv0297_writereg_mask(state, 0x43, 0x10, 0x10); + + /* wait for WGAGC lock */ + timeout = jiffies + msecs_to_jiffies(2000); + while (time_before(jiffies, timeout)) { + msleep(10); + if (stv0297_readreg(state, 0x43) & 0x08) + break; + } + if (time_after(jiffies, timeout)) { + goto timeout; + } + msleep(20); + + /* wait for equaliser partial convergence */ + timeout = jiffies + msecs_to_jiffies(500); + while (time_before(jiffies, timeout)) { + msleep(10); + + if (stv0297_readreg(state, 0x82) & 0x04) { + break; + } + } + if (time_after(jiffies, timeout)) { + goto timeout; + } + + /* wait for equaliser full convergence */ + timeout = jiffies + msecs_to_jiffies(delay); + while (time_before(jiffies, timeout)) { + msleep(10); + + if (stv0297_readreg(state, 0x82) & 0x08) { + break; + } + } + if (time_after(jiffies, timeout)) { + goto timeout; + } + + /* disable sweep */ + stv0297_writereg_mask(state, 0x6a, 1, 0); + stv0297_writereg_mask(state, 0x88, 8, 0); + + /* wait for main lock */ + timeout = jiffies + msecs_to_jiffies(20); + while (time_before(jiffies, timeout)) { + msleep(10); + + if (stv0297_readreg(state, 0xDF) & 0x80) { + break; + } + } + if (time_after(jiffies, timeout)) { + goto timeout; + } + msleep(100); + + /* is it still locked after that delay? */ + if (!(stv0297_readreg(state, 0xDF) & 0x80)) { + goto timeout; + } + + /* success!! */ + stv0297_writereg_mask(state, 0x5a, 0x40, 0x00); + state->base_freq = p->frequency; + return 0; + +timeout: + stv0297_writereg_mask(state, 0x6a, 0x01, 0x00); + return 0; +} + +static int stv0297_get_frontend(struct dvb_frontend *fe, + struct dtv_frontend_properties *p) +{ + struct stv0297_state *state = fe->demodulator_priv; + int reg_00, reg_83; + + reg_00 = stv0297_readreg(state, 0x00); + reg_83 = stv0297_readreg(state, 0x83); + + p->frequency = state->base_freq; + p->inversion = (reg_83 & 0x08) ? INVERSION_ON : INVERSION_OFF; + if (state->config->invert) + p->inversion = (p->inversion == INVERSION_ON) ? INVERSION_OFF : INVERSION_ON; + p->symbol_rate = stv0297_get_symbolrate(state) * 1000; + p->fec_inner = FEC_NONE; + + switch ((reg_00 >> 4) & 0x7) { + case 0: + p->modulation = QAM_16; + break; + case 1: + p->modulation = QAM_32; + break; + case 2: + p->modulation = QAM_128; + break; + case 3: + p->modulation = QAM_256; + break; + case 4: + p->modulation = QAM_64; + break; + } + + return 0; +} + +static void stv0297_release(struct dvb_frontend *fe) +{ + struct stv0297_state *state = fe->demodulator_priv; + kfree(state); +} + +static const struct dvb_frontend_ops stv0297_ops; + +struct dvb_frontend *stv0297_attach(const struct stv0297_config *config, + struct i2c_adapter *i2c) +{ + struct stv0297_state *state = NULL; + + /* allocate memory for the internal state */ + state = kzalloc(sizeof(struct stv0297_state), GFP_KERNEL); + if (state == NULL) + goto error; + + /* setup the state */ + state->config = config; + state->i2c = i2c; + state->last_ber = 0; + state->base_freq = 0; + + /* check if the demod is there */ + if ((stv0297_readreg(state, 0x80) & 0x70) != 0x20) + goto error; + + /* create dvb_frontend */ + memcpy(&state->frontend.ops, &stv0297_ops, sizeof(struct dvb_frontend_ops)); + state->frontend.demodulator_priv = state; + return &state->frontend; + +error: + kfree(state); + return NULL; +} + +static const struct dvb_frontend_ops stv0297_ops = { + .delsys = { SYS_DVBC_ANNEX_A }, + .info = { + .name = "ST STV0297 DVB-C", + .frequency_min_hz = 47 * MHz, + .frequency_max_hz = 862 * MHz, + .frequency_stepsize_hz = 62500, + .symbol_rate_min = 870000, + .symbol_rate_max = 11700000, + .caps = FE_CAN_QAM_16 | FE_CAN_QAM_32 | FE_CAN_QAM_64 | + FE_CAN_QAM_128 | FE_CAN_QAM_256 | FE_CAN_FEC_AUTO}, + + .release = stv0297_release, + + .init = stv0297_init, + .sleep = stv0297_sleep, + .i2c_gate_ctrl = stv0297_i2c_gate_ctrl, + + .set_frontend = stv0297_set_frontend, + .get_frontend = stv0297_get_frontend, + + .read_status = stv0297_read_status, + .read_ber = stv0297_read_ber, + .read_signal_strength = stv0297_read_signal_strength, + .read_snr = stv0297_read_snr, + .read_ucblocks = stv0297_read_ucblocks, +}; + +MODULE_DESCRIPTION("ST STV0297 DVB-C Demodulator driver"); +MODULE_AUTHOR("Dennis Noermann and Andrew de Quincey"); +MODULE_LICENSE("GPL"); + +EXPORT_SYMBOL_GPL(stv0297_attach); |