diff options
Diffstat (limited to 'drivers/media/dvb-frontends/l64781.c')
| -rw-r--r-- | drivers/media/dvb-frontends/l64781.c | 596 |
1 files changed, 596 insertions, 0 deletions
diff --git a/drivers/media/dvb-frontends/l64781.c b/drivers/media/dvb-frontends/l64781.c new file mode 100644 index 000000000..fe5af2453 --- /dev/null +++ b/drivers/media/dvb-frontends/l64781.c @@ -0,0 +1,596 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + driver for LSI L64781 COFDM demodulator + + Copyright (C) 2001 Holger Waechtler for Convergence Integrated Media GmbH + Marko Kohtala <marko.kohtala@luukku.com> + + +*/ + +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/string.h> +#include <linux/slab.h> +#include <media/dvb_frontend.h> +#include "l64781.h" + + +struct l64781_state { + struct i2c_adapter* i2c; + const struct l64781_config* config; + struct dvb_frontend frontend; + + /* private demodulator data */ + unsigned int first:1; +}; + +#define dprintk(args...) \ + do { \ + if (debug) printk(KERN_DEBUG "l64781: " args); \ + } while (0) + +static int debug; + +module_param(debug, int, 0644); +MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off)."); + + +static int l64781_writereg (struct l64781_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 }; + + if ((ret = i2c_transfer(state->i2c, &msg, 1)) != 1) + dprintk ("%s: write_reg error (reg == %02x) = %02x!\n", + __func__, reg, ret); + + return (ret != 1) ? -1 : 0; +} + +static int l64781_readreg (struct l64781_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 } }; + + ret = i2c_transfer(state->i2c, msg, 2); + + if (ret != 2) return ret; + + return b1[0]; +} + +static void apply_tps (struct l64781_state* state) +{ + l64781_writereg (state, 0x2a, 0x00); + l64781_writereg (state, 0x2a, 0x01); + + /* This here is a little bit questionable because it enables + the automatic update of TPS registers. I think we'd need to + handle the IRQ from FE to update some other registers as + well, or at least implement some magic to tuning to correct + to the TPS received from transmission. */ + l64781_writereg (state, 0x2a, 0x02); +} + + +static void reset_afc (struct l64781_state* state) +{ + /* Set AFC stall for the AFC_INIT_FRQ setting, TIM_STALL for + timing offset */ + l64781_writereg (state, 0x07, 0x9e); /* stall AFC */ + l64781_writereg (state, 0x08, 0); /* AFC INIT FREQ */ + l64781_writereg (state, 0x09, 0); + l64781_writereg (state, 0x0a, 0); + l64781_writereg (state, 0x07, 0x8e); + l64781_writereg (state, 0x0e, 0); /* AGC gain to zero in beginning */ + l64781_writereg (state, 0x11, 0x80); /* stall TIM */ + l64781_writereg (state, 0x10, 0); /* TIM_OFFSET_LSB */ + l64781_writereg (state, 0x12, 0); + l64781_writereg (state, 0x13, 0); + l64781_writereg (state, 0x11, 0x00); +} + +static int reset_and_configure (struct l64781_state* state) +{ + u8 buf [] = { 0x06 }; + struct i2c_msg msg = { .addr = 0x00, .flags = 0, .buf = buf, .len = 1 }; + // NOTE: this is correct in writing to address 0x00 + + return (i2c_transfer(state->i2c, &msg, 1) == 1) ? 0 : -ENODEV; +} + +static int apply_frontend_param(struct dvb_frontend *fe) +{ + struct dtv_frontend_properties *p = &fe->dtv_property_cache; + struct l64781_state* state = fe->demodulator_priv; + /* The coderates for FEC_NONE, FEC_4_5 and FEC_FEC_6_7 are arbitrary */ + static const u8 fec_tab[] = { 7, 0, 1, 2, 9, 3, 10, 4 }; + /* QPSK, QAM_16, QAM_64 */ + static const u8 qam_tab [] = { 2, 4, 0, 6 }; + static const u8 guard_tab [] = { 1, 2, 4, 8 }; + /* The Grundig 29504-401.04 Tuner comes with 18.432MHz crystal. */ + static const u32 ppm = 8000; + u32 ddfs_offset_fixed; +/* u32 ddfs_offset_variable = 0x6000-((1000000UL+ppm)/ */ +/* bw_tab[p->bandWidth]<<10)/15625; */ + u32 init_freq; + u32 spi_bias; + u8 val0x04; + u8 val0x05; + u8 val0x06; + int bw; + + switch (p->bandwidth_hz) { + case 8000000: + bw = 8; + break; + case 7000000: + bw = 7; + break; + case 6000000: + bw = 6; + break; + default: + return -EINVAL; + } + + 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); + } + + if (p->inversion != INVERSION_ON && + p->inversion != INVERSION_OFF) + return -EINVAL; + + if (p->code_rate_HP != FEC_1_2 && p->code_rate_HP != FEC_2_3 && + p->code_rate_HP != FEC_3_4 && p->code_rate_HP != FEC_5_6 && + p->code_rate_HP != FEC_7_8) + return -EINVAL; + + if (p->hierarchy != HIERARCHY_NONE && + (p->code_rate_LP != FEC_1_2 && p->code_rate_LP != FEC_2_3 && + p->code_rate_LP != FEC_3_4 && p->code_rate_LP != FEC_5_6 && + p->code_rate_LP != FEC_7_8)) + return -EINVAL; + + if (p->modulation != QPSK && p->modulation != QAM_16 && + p->modulation != QAM_64) + return -EINVAL; + + if (p->transmission_mode != TRANSMISSION_MODE_2K && + p->transmission_mode != TRANSMISSION_MODE_8K) + return -EINVAL; + + if ((int)p->guard_interval < GUARD_INTERVAL_1_32 || + p->guard_interval > GUARD_INTERVAL_1_4) + return -EINVAL; + + if ((int)p->hierarchy < HIERARCHY_NONE || + p->hierarchy > HIERARCHY_4) + return -EINVAL; + + ddfs_offset_fixed = 0x4000-(ppm<<16)/bw/1000000; + + /* This works up to 20000 ppm, it overflows if too large ppm! */ + init_freq = (((8UL<<25) + (8UL<<19) / 25*ppm / (15625/25)) / + bw & 0xFFFFFF); + + /* SPI bias calculation is slightly modified to fit in 32bit */ + /* will work for high ppm only... */ + spi_bias = 378 * (1 << 10); + spi_bias *= 16; + spi_bias *= bw; + spi_bias *= qam_tab[p->modulation]; + spi_bias /= p->code_rate_HP + 1; + spi_bias /= (guard_tab[p->guard_interval] + 32); + spi_bias *= 1000; + spi_bias /= 1000 + ppm/1000; + spi_bias *= p->code_rate_HP; + + val0x04 = (p->transmission_mode << 2) | p->guard_interval; + val0x05 = fec_tab[p->code_rate_HP]; + + if (p->hierarchy != HIERARCHY_NONE) + val0x05 |= (p->code_rate_LP - FEC_1_2) << 3; + + val0x06 = (p->hierarchy << 2) | p->modulation; + + l64781_writereg (state, 0x04, val0x04); + l64781_writereg (state, 0x05, val0x05); + l64781_writereg (state, 0x06, val0x06); + + reset_afc (state); + + /* Technical manual section 2.6.1, TIM_IIR_GAIN optimal values */ + l64781_writereg (state, 0x15, + p->transmission_mode == TRANSMISSION_MODE_2K ? 1 : 3); + l64781_writereg (state, 0x16, init_freq & 0xff); + l64781_writereg (state, 0x17, (init_freq >> 8) & 0xff); + l64781_writereg (state, 0x18, (init_freq >> 16) & 0xff); + + l64781_writereg (state, 0x1b, spi_bias & 0xff); + l64781_writereg (state, 0x1c, (spi_bias >> 8) & 0xff); + l64781_writereg (state, 0x1d, ((spi_bias >> 16) & 0x7f) | + (p->inversion == INVERSION_ON ? 0x80 : 0x00)); + + l64781_writereg (state, 0x22, ddfs_offset_fixed & 0xff); + l64781_writereg (state, 0x23, (ddfs_offset_fixed >> 8) & 0x3f); + + l64781_readreg (state, 0x00); /* clear interrupt registers... */ + l64781_readreg (state, 0x01); /* dto. */ + + apply_tps (state); + + return 0; +} + +static int get_frontend(struct dvb_frontend *fe, + struct dtv_frontend_properties *p) +{ + struct l64781_state* state = fe->demodulator_priv; + int tmp; + + + tmp = l64781_readreg(state, 0x04); + switch(tmp & 3) { + 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((tmp >> 2) & 3) { + case 0: + p->transmission_mode = TRANSMISSION_MODE_2K; + break; + case 1: + p->transmission_mode = TRANSMISSION_MODE_8K; + break; + default: + printk(KERN_WARNING "Unexpected value for transmission_mode\n"); + } + + tmp = l64781_readreg(state, 0x05); + switch(tmp & 7) { + 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; + default: + printk("Unexpected value for code_rate_HP\n"); + } + switch((tmp >> 3) & 7) { + 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; + default: + printk("Unexpected value for code_rate_LP\n"); + } + + tmp = l64781_readreg(state, 0x06); + switch(tmp & 3) { + case 0: + p->modulation = QPSK; + break; + case 1: + p->modulation = QAM_16; + break; + case 2: + p->modulation = QAM_64; + break; + default: + printk(KERN_WARNING "Unexpected value for modulation\n"); + } + switch((tmp >> 2) & 7) { + 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; + default: + printk("Unexpected value for hierarchy\n"); + } + + + tmp = l64781_readreg (state, 0x1d); + p->inversion = (tmp & 0x80) ? INVERSION_ON : INVERSION_OFF; + + tmp = (int) (l64781_readreg (state, 0x08) | + (l64781_readreg (state, 0x09) << 8) | + (l64781_readreg (state, 0x0a) << 16)); + p->frequency += tmp; + + return 0; +} + +static int l64781_read_status(struct dvb_frontend *fe, enum fe_status *status) +{ + struct l64781_state* state = fe->demodulator_priv; + int sync = l64781_readreg (state, 0x32); + int gain = l64781_readreg (state, 0x0e); + + l64781_readreg (state, 0x00); /* clear interrupt registers... */ + l64781_readreg (state, 0x01); /* dto. */ + + *status = 0; + + if (gain > 5) + *status |= FE_HAS_SIGNAL; + + if (sync & 0x02) /* VCXO locked, this criteria should be ok */ + *status |= FE_HAS_CARRIER; + + if (sync & 0x20) + *status |= FE_HAS_VITERBI; + + if (sync & 0x40) + *status |= FE_HAS_SYNC; + + if (sync == 0x7f) + *status |= FE_HAS_LOCK; + + return 0; +} + +static int l64781_read_ber(struct dvb_frontend* fe, u32* ber) +{ + struct l64781_state* state = fe->demodulator_priv; + + /* XXX FIXME: set up counting period (reg 0x26...0x28) + */ + *ber = l64781_readreg (state, 0x39) + | (l64781_readreg (state, 0x3a) << 8); + + return 0; +} + +static int l64781_read_signal_strength(struct dvb_frontend* fe, u16* signal_strength) +{ + struct l64781_state* state = fe->demodulator_priv; + + u8 gain = l64781_readreg (state, 0x0e); + *signal_strength = (gain << 8) | gain; + + return 0; +} + +static int l64781_read_snr(struct dvb_frontend* fe, u16* snr) +{ + struct l64781_state* state = fe->demodulator_priv; + + u8 avg_quality = 0xff - l64781_readreg (state, 0x33); + *snr = (avg_quality << 8) | avg_quality; /* not exact, but...*/ + + return 0; +} + +static int l64781_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks) +{ + struct l64781_state* state = fe->demodulator_priv; + + *ucblocks = l64781_readreg (state, 0x37) + | (l64781_readreg (state, 0x38) << 8); + + return 0; +} + +static int l64781_sleep(struct dvb_frontend* fe) +{ + struct l64781_state* state = fe->demodulator_priv; + + /* Power down */ + return l64781_writereg (state, 0x3e, 0x5a); +} + +static int l64781_init(struct dvb_frontend* fe) +{ + struct l64781_state* state = fe->demodulator_priv; + + reset_and_configure (state); + + /* Power up */ + l64781_writereg (state, 0x3e, 0xa5); + + /* Reset hard */ + l64781_writereg (state, 0x2a, 0x04); + l64781_writereg (state, 0x2a, 0x00); + + /* Set tuner specific things */ + /* AFC_POL, set also in reset_afc */ + l64781_writereg (state, 0x07, 0x8e); + + /* Use internal ADC */ + l64781_writereg (state, 0x0b, 0x81); + + /* AGC loop gain, and polarity is positive */ + l64781_writereg (state, 0x0c, 0x84); + + /* Internal ADC outputs two's complement */ + l64781_writereg (state, 0x0d, 0x8c); + + /* With ppm=8000, it seems the DTR_SENSITIVITY will result in + value of 2 with all possible bandwidths and guard + intervals, which is the initial value anyway. */ + /*l64781_writereg (state, 0x19, 0x92);*/ + + /* Everything is two's complement, soft bit and CSI_OUT too */ + l64781_writereg (state, 0x1e, 0x09); + + /* delay a bit after first init attempt */ + if (state->first) { + state->first = 0; + msleep(200); + } + + return 0; +} + +static int l64781_get_tune_settings(struct dvb_frontend* fe, + struct dvb_frontend_tune_settings* fesettings) +{ + fesettings->min_delay_ms = 4000; + fesettings->step_size = 0; + fesettings->max_drift = 0; + return 0; +} + +static void l64781_release(struct dvb_frontend* fe) +{ + struct l64781_state* state = fe->demodulator_priv; + kfree(state); +} + +static const struct dvb_frontend_ops l64781_ops; + +struct dvb_frontend* l64781_attach(const struct l64781_config* config, + struct i2c_adapter* i2c) +{ + struct l64781_state* state = NULL; + int reg0x3e = -1; + u8 b0 [] = { 0x1a }; + u8 b1 [] = { 0x00 }; + struct i2c_msg msg [] = { { .addr = config->demod_address, .flags = 0, .buf = b0, .len = 1 }, + { .addr = config->demod_address, .flags = I2C_M_RD, .buf = b1, .len = 1 } }; + + /* allocate memory for the internal state */ + state = kzalloc(sizeof(struct l64781_state), GFP_KERNEL); + if (state == NULL) goto error; + + /* setup the state */ + state->config = config; + state->i2c = i2c; + state->first = 1; + + /* + * the L64781 won't show up before we send the reset_and_configure() + * broadcast. If nothing responds there is no L64781 on the bus... + */ + if (reset_and_configure(state) < 0) { + dprintk("No response to reset and configure broadcast...\n"); + goto error; + } + + /* The chip always responds to reads */ + if (i2c_transfer(state->i2c, msg, 2) != 2) { + dprintk("No response to read on I2C bus\n"); + goto error; + } + + /* Save current register contents for bailout */ + reg0x3e = l64781_readreg(state, 0x3e); + + /* Reading the POWER_DOWN register always returns 0 */ + if (reg0x3e != 0) { + dprintk("Device doesn't look like L64781\n"); + goto error; + } + + /* Turn the chip off */ + l64781_writereg (state, 0x3e, 0x5a); + + /* Responds to all reads with 0 */ + if (l64781_readreg(state, 0x1a) != 0) { + dprintk("Read 1 returned unexpected value\n"); + goto error; + } + + /* Turn the chip on */ + l64781_writereg (state, 0x3e, 0xa5); + + /* Responds with register default value */ + if (l64781_readreg(state, 0x1a) != 0xa1) { + dprintk("Read 2 returned unexpected value\n"); + goto error; + } + + /* create dvb_frontend */ + memcpy(&state->frontend.ops, &l64781_ops, sizeof(struct dvb_frontend_ops)); + state->frontend.demodulator_priv = state; + return &state->frontend; + +error: + if (reg0x3e >= 0) + l64781_writereg (state, 0x3e, reg0x3e); /* restore reg 0x3e */ + kfree(state); + return NULL; +} + +static const struct dvb_frontend_ops l64781_ops = { + .delsys = { SYS_DVBT }, + .info = { + .name = "LSI L64781 DVB-T", + /* .frequency_min_hz = ???,*/ + /* .frequency_max_hz = ???,*/ + .frequency_stepsize_hz = 166666, + /* .symbol_rate_tolerance = ???,*/ + .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_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_64 | + FE_CAN_MUTE_TS + }, + + .release = l64781_release, + + .init = l64781_init, + .sleep = l64781_sleep, + + .set_frontend = apply_frontend_param, + .get_frontend = get_frontend, + .get_tune_settings = l64781_get_tune_settings, + + .read_status = l64781_read_status, + .read_ber = l64781_read_ber, + .read_signal_strength = l64781_read_signal_strength, + .read_snr = l64781_read_snr, + .read_ucblocks = l64781_read_ucblocks, +}; + +MODULE_DESCRIPTION("LSI L64781 DVB-T Demodulator driver"); +MODULE_AUTHOR("Holger Waechtler, Marko Kohtala"); +MODULE_LICENSE("GPL"); + +EXPORT_SYMBOL_GPL(l64781_attach); |