diff options
Diffstat (limited to 'drivers/media/dvb-frontends/cx24123.c')
| -rw-r--r-- | drivers/media/dvb-frontends/cx24123.c | 1165 |
1 files changed, 1165 insertions, 0 deletions
diff --git a/drivers/media/dvb-frontends/cx24123.c b/drivers/media/dvb-frontends/cx24123.c new file mode 100644 index 0000000..7e28b4e --- /dev/null +++ b/drivers/media/dvb-frontends/cx24123.c @@ -0,0 +1,1165 @@ +/* + * Conexant cx24123/cx24109 - DVB QPSK Satellite demod/tuner driver + * + * Copyright (C) 2005 Steven Toth <stoth@linuxtv.org> + * + * Support for KWorld DVB-S 100 by Vadim Catana <skystar@moldova.cc> + * + * Support for CX24123/CX24113-NIM by Patrick Boettcher <pb@linuxtv.org> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +#include <linux/slab.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/init.h> + +#include "dvb_frontend.h" +#include "cx24123.h" + +#define XTAL 10111000 + +static int force_band; +module_param(force_band, int, 0644); +MODULE_PARM_DESC(force_band, "Force a specific band select "\ + "(1-9, default:off)."); + +static int debug; +module_param(debug, int, 0644); +MODULE_PARM_DESC(debug, "Activates frontend debugging (default:0)"); + +#define info(args...) do { printk(KERN_INFO "CX24123: " args); } while (0) +#define err(args...) do { printk(KERN_ERR "CX24123: " args); } while (0) + +#define dprintk(args...) \ + do { \ + if (debug) { \ + printk(KERN_DEBUG "CX24123: %s: ", __func__); \ + printk(args); \ + } \ + } while (0) + +struct cx24123_state { + struct i2c_adapter *i2c; + const struct cx24123_config *config; + + struct dvb_frontend frontend; + + /* Some PLL specifics for tuning */ + u32 VCAarg; + u32 VGAarg; + u32 bandselectarg; + u32 pllarg; + u32 FILTune; + + struct i2c_adapter tuner_i2c_adapter; + + u8 demod_rev; + + /* The Demod/Tuner can't easily provide these, we cache them */ + u32 currentfreq; + u32 currentsymbolrate; +}; + +/* Various tuner defaults need to be established for a given symbol rate Sps */ +static struct cx24123_AGC_val { + u32 symbolrate_low; + u32 symbolrate_high; + u32 VCAprogdata; + u32 VGAprogdata; + u32 FILTune; +} cx24123_AGC_vals[] = +{ + { + .symbolrate_low = 1000000, + .symbolrate_high = 4999999, + /* the specs recommend other values for VGA offsets, + but tests show they are wrong */ + .VGAprogdata = (1 << 19) | (0x180 << 9) | 0x1e0, + .VCAprogdata = (2 << 19) | (0x07 << 9) | 0x07, + .FILTune = 0x27f /* 0.41 V */ + }, + { + .symbolrate_low = 5000000, + .symbolrate_high = 14999999, + .VGAprogdata = (1 << 19) | (0x180 << 9) | 0x1e0, + .VCAprogdata = (2 << 19) | (0x07 << 9) | 0x1f, + .FILTune = 0x317 /* 0.90 V */ + }, + { + .symbolrate_low = 15000000, + .symbolrate_high = 45000000, + .VGAprogdata = (1 << 19) | (0x100 << 9) | 0x180, + .VCAprogdata = (2 << 19) | (0x07 << 9) | 0x3f, + .FILTune = 0x145 /* 2.70 V */ + }, +}; + +/* + * Various tuner defaults need to be established for a given frequency kHz. + * fixme: The bounds on the bands do not match the doc in real life. + * fixme: Some of them have been moved, other might need adjustment. + */ +static struct cx24123_bandselect_val { + u32 freq_low; + u32 freq_high; + u32 VCOdivider; + u32 progdata; +} cx24123_bandselect_vals[] = +{ + /* band 1 */ + { + .freq_low = 950000, + .freq_high = 1074999, + .VCOdivider = 4, + .progdata = (0 << 19) | (0 << 9) | 0x40, + }, + + /* band 2 */ + { + .freq_low = 1075000, + .freq_high = 1177999, + .VCOdivider = 4, + .progdata = (0 << 19) | (0 << 9) | 0x80, + }, + + /* band 3 */ + { + .freq_low = 1178000, + .freq_high = 1295999, + .VCOdivider = 2, + .progdata = (0 << 19) | (1 << 9) | 0x01, + }, + + /* band 4 */ + { + .freq_low = 1296000, + .freq_high = 1431999, + .VCOdivider = 2, + .progdata = (0 << 19) | (1 << 9) | 0x02, + }, + + /* band 5 */ + { + .freq_low = 1432000, + .freq_high = 1575999, + .VCOdivider = 2, + .progdata = (0 << 19) | (1 << 9) | 0x04, + }, + + /* band 6 */ + { + .freq_low = 1576000, + .freq_high = 1717999, + .VCOdivider = 2, + .progdata = (0 << 19) | (1 << 9) | 0x08, + }, + + /* band 7 */ + { + .freq_low = 1718000, + .freq_high = 1855999, + .VCOdivider = 2, + .progdata = (0 << 19) | (1 << 9) | 0x10, + }, + + /* band 8 */ + { + .freq_low = 1856000, + .freq_high = 2035999, + .VCOdivider = 2, + .progdata = (0 << 19) | (1 << 9) | 0x20, + }, + + /* band 9 */ + { + .freq_low = 2036000, + .freq_high = 2150000, + .VCOdivider = 2, + .progdata = (0 << 19) | (1 << 9) | 0x40, + }, +}; + +static struct { + u8 reg; + u8 data; +} cx24123_regdata[] = +{ + {0x00, 0x03}, /* Reset system */ + {0x00, 0x00}, /* Clear reset */ + {0x03, 0x07}, /* QPSK, DVB, Auto Acquisition (default) */ + {0x04, 0x10}, /* MPEG */ + {0x05, 0x04}, /* MPEG */ + {0x06, 0x31}, /* MPEG (default) */ + {0x0b, 0x00}, /* Freq search start point (default) */ + {0x0c, 0x00}, /* Demodulator sample gain (default) */ + {0x0d, 0x7f}, /* Force driver to shift until the maximum (+-10 MHz) */ + {0x0e, 0x03}, /* Default non-inverted, FEC 3/4 (default) */ + {0x0f, 0xfe}, /* FEC search mask (all supported codes) */ + {0x10, 0x01}, /* Default search inversion, no repeat (default) */ + {0x16, 0x00}, /* Enable reading of frequency */ + {0x17, 0x01}, /* Enable EsNO Ready Counter */ + {0x1c, 0x80}, /* Enable error counter */ + {0x20, 0x00}, /* Tuner burst clock rate = 500KHz */ + {0x21, 0x15}, /* Tuner burst mode, word length = 0x15 */ + {0x28, 0x00}, /* Enable FILTERV with positive pol., DiSEqC 2.x off */ + {0x29, 0x00}, /* DiSEqC LNB_DC off */ + {0x2a, 0xb0}, /* DiSEqC Parameters (default) */ + {0x2b, 0x73}, /* DiSEqC Tone Frequency (default) */ + {0x2c, 0x00}, /* DiSEqC Message (0x2c - 0x31) */ + {0x2d, 0x00}, + {0x2e, 0x00}, + {0x2f, 0x00}, + {0x30, 0x00}, + {0x31, 0x00}, + {0x32, 0x8c}, /* DiSEqC Parameters (default) */ + {0x33, 0x00}, /* Interrupts off (0x33 - 0x34) */ + {0x34, 0x00}, + {0x35, 0x03}, /* DiSEqC Tone Amplitude (default) */ + {0x36, 0x02}, /* DiSEqC Parameters (default) */ + {0x37, 0x3a}, /* DiSEqC Parameters (default) */ + {0x3a, 0x00}, /* Enable AGC accumulator (for signal strength) */ + {0x44, 0x00}, /* Constellation (default) */ + {0x45, 0x00}, /* Symbol count (default) */ + {0x46, 0x0d}, /* Symbol rate estimator on (default) */ + {0x56, 0xc1}, /* Error Counter = Viterbi BER */ + {0x57, 0xff}, /* Error Counter Window (default) */ + {0x5c, 0x20}, /* Acquisition AFC Expiration window (default is 0x10) */ + {0x67, 0x83}, /* Non-DCII symbol clock */ +}; + +static int cx24123_i2c_writereg(struct cx24123_state *state, + u8 i2c_addr, int reg, int data) +{ + u8 buf[] = { reg, data }; + struct i2c_msg msg = { + .addr = i2c_addr, .flags = 0, .buf = buf, .len = 2 + }; + int err; + + /* printk(KERN_DEBUG "wr(%02x): %02x %02x\n", i2c_addr, reg, data); */ + + err = i2c_transfer(state->i2c, &msg, 1); + if (err != 1) { + printk("%s: writereg error(err == %i, reg == 0x%02x," + " data == 0x%02x)\n", __func__, err, reg, data); + return err; + } + + return 0; +} + +static int cx24123_i2c_readreg(struct cx24123_state *state, u8 i2c_addr, u8 reg) +{ + int ret; + u8 b = 0; + struct i2c_msg msg[] = { + { .addr = i2c_addr, .flags = 0, .buf = ®, .len = 1 }, + { .addr = i2c_addr, .flags = I2C_M_RD, .buf = &b, .len = 1 } + }; + + ret = i2c_transfer(state->i2c, msg, 2); + + if (ret != 2) { + err("%s: reg=0x%x (error=%d)\n", __func__, reg, ret); + return ret; + } + + /* printk(KERN_DEBUG "rd(%02x): %02x %02x\n", i2c_addr, reg, b); */ + + return b; +} + +#define cx24123_readreg(state, reg) \ + cx24123_i2c_readreg(state, state->config->demod_address, reg) +#define cx24123_writereg(state, reg, val) \ + cx24123_i2c_writereg(state, state->config->demod_address, reg, val) + +static int cx24123_set_inversion(struct cx24123_state *state, + fe_spectral_inversion_t inversion) +{ + u8 nom_reg = cx24123_readreg(state, 0x0e); + u8 auto_reg = cx24123_readreg(state, 0x10); + + switch (inversion) { + case INVERSION_OFF: + dprintk("inversion off\n"); + cx24123_writereg(state, 0x0e, nom_reg & ~0x80); + cx24123_writereg(state, 0x10, auto_reg | 0x80); + break; + case INVERSION_ON: + dprintk("inversion on\n"); + cx24123_writereg(state, 0x0e, nom_reg | 0x80); + cx24123_writereg(state, 0x10, auto_reg | 0x80); + break; + case INVERSION_AUTO: + dprintk("inversion auto\n"); + cx24123_writereg(state, 0x10, auto_reg & ~0x80); + break; + default: + return -EINVAL; + } + + return 0; +} + +static int cx24123_get_inversion(struct cx24123_state *state, + fe_spectral_inversion_t *inversion) +{ + u8 val; + + val = cx24123_readreg(state, 0x1b) >> 7; + + if (val == 0) { + dprintk("read inversion off\n"); + *inversion = INVERSION_OFF; + } else { + dprintk("read inversion on\n"); + *inversion = INVERSION_ON; + } + + return 0; +} + +static int cx24123_set_fec(struct cx24123_state *state, fe_code_rate_t fec) +{ + u8 nom_reg = cx24123_readreg(state, 0x0e) & ~0x07; + + if ((fec < FEC_NONE) || (fec > FEC_AUTO)) + fec = FEC_AUTO; + + /* Set the soft decision threshold */ + if (fec == FEC_1_2) + cx24123_writereg(state, 0x43, + cx24123_readreg(state, 0x43) | 0x01); + else + cx24123_writereg(state, 0x43, + cx24123_readreg(state, 0x43) & ~0x01); + + switch (fec) { + case FEC_1_2: + dprintk("set FEC to 1/2\n"); + cx24123_writereg(state, 0x0e, nom_reg | 0x01); + cx24123_writereg(state, 0x0f, 0x02); + break; + case FEC_2_3: + dprintk("set FEC to 2/3\n"); + cx24123_writereg(state, 0x0e, nom_reg | 0x02); + cx24123_writereg(state, 0x0f, 0x04); + break; + case FEC_3_4: + dprintk("set FEC to 3/4\n"); + cx24123_writereg(state, 0x0e, nom_reg | 0x03); + cx24123_writereg(state, 0x0f, 0x08); + break; + case FEC_4_5: + dprintk("set FEC to 4/5\n"); + cx24123_writereg(state, 0x0e, nom_reg | 0x04); + cx24123_writereg(state, 0x0f, 0x10); + break; + case FEC_5_6: + dprintk("set FEC to 5/6\n"); + cx24123_writereg(state, 0x0e, nom_reg | 0x05); + cx24123_writereg(state, 0x0f, 0x20); + break; + case FEC_6_7: + dprintk("set FEC to 6/7\n"); + cx24123_writereg(state, 0x0e, nom_reg | 0x06); + cx24123_writereg(state, 0x0f, 0x40); + break; + case FEC_7_8: + dprintk("set FEC to 7/8\n"); + cx24123_writereg(state, 0x0e, nom_reg | 0x07); + cx24123_writereg(state, 0x0f, 0x80); + break; + case FEC_AUTO: + dprintk("set FEC to auto\n"); + cx24123_writereg(state, 0x0f, 0xfe); + break; + default: + return -EOPNOTSUPP; + } + + return 0; +} + +static int cx24123_get_fec(struct cx24123_state *state, fe_code_rate_t *fec) +{ + int ret; + + ret = cx24123_readreg(state, 0x1b); + if (ret < 0) + return ret; + ret = ret & 0x07; + + switch (ret) { + case 1: + *fec = FEC_1_2; + break; + case 2: + *fec = FEC_2_3; + break; + case 3: + *fec = FEC_3_4; + break; + case 4: + *fec = FEC_4_5; + break; + case 5: + *fec = FEC_5_6; + break; + case 6: + *fec = FEC_6_7; + break; + case 7: + *fec = FEC_7_8; + break; + default: + /* this can happen when there's no lock */ + *fec = FEC_NONE; + } + + return 0; +} + +/* Approximation of closest integer of log2(a/b). It actually gives the + lowest integer i such that 2^i >= round(a/b) */ +static u32 cx24123_int_log2(u32 a, u32 b) +{ + u32 exp, nearest = 0; + u32 div = a / b; + if (a % b >= b / 2) + ++div; + if (div < (1 << 31)) { + for (exp = 1; div > exp; nearest++) + exp += exp; + } + return nearest; +} + +static int cx24123_set_symbolrate(struct cx24123_state *state, u32 srate) +{ + u32 tmp, sample_rate, ratio, sample_gain; + u8 pll_mult; + + /* check if symbol rate is within limits */ + if ((srate > state->frontend.ops.info.symbol_rate_max) || + (srate < state->frontend.ops.info.symbol_rate_min)) + return -EOPNOTSUPP; + + /* choose the sampling rate high enough for the required operation, + while optimizing the power consumed by the demodulator */ + if (srate < (XTAL*2)/2) + pll_mult = 2; + else if (srate < (XTAL*3)/2) + pll_mult = 3; + else if (srate < (XTAL*4)/2) + pll_mult = 4; + else if (srate < (XTAL*5)/2) + pll_mult = 5; + else if (srate < (XTAL*6)/2) + pll_mult = 6; + else if (srate < (XTAL*7)/2) + pll_mult = 7; + else if (srate < (XTAL*8)/2) + pll_mult = 8; + else + pll_mult = 9; + + + sample_rate = pll_mult * XTAL; + + /* + SYSSymbolRate[21:0] = (srate << 23) / sample_rate + + We have to use 32 bit unsigned arithmetic without precision loss. + The maximum srate is 45000000 or 0x02AEA540. This number has + only 6 clear bits on top, hence we can shift it left only 6 bits + at a time. Borrowed from cx24110.c + */ + + tmp = srate << 6; + ratio = tmp / sample_rate; + + tmp = (tmp % sample_rate) << 6; + ratio = (ratio << 6) + (tmp / sample_rate); + + tmp = (tmp % sample_rate) << 6; + ratio = (ratio << 6) + (tmp / sample_rate); + + tmp = (tmp % sample_rate) << 5; + ratio = (ratio << 5) + (tmp / sample_rate); + + + cx24123_writereg(state, 0x01, pll_mult * 6); + + cx24123_writereg(state, 0x08, (ratio >> 16) & 0x3f); + cx24123_writereg(state, 0x09, (ratio >> 8) & 0xff); + cx24123_writereg(state, 0x0a, ratio & 0xff); + + /* also set the demodulator sample gain */ + sample_gain = cx24123_int_log2(sample_rate, srate); + tmp = cx24123_readreg(state, 0x0c) & ~0xe0; + cx24123_writereg(state, 0x0c, tmp | sample_gain << 5); + + dprintk("srate=%d, ratio=0x%08x, sample_rate=%i sample_gain=%d\n", + srate, ratio, sample_rate, sample_gain); + + return 0; +} + +/* + * Based on the required frequency and symbolrate, the tuner AGC has + * to be configured and the correct band selected. + * Calculate those values. + */ +static int cx24123_pll_calculate(struct dvb_frontend *fe) +{ + struct dtv_frontend_properties *p = &fe->dtv_property_cache; + struct cx24123_state *state = fe->demodulator_priv; + u32 ndiv = 0, adiv = 0, vco_div = 0; + int i = 0; + int pump = 2; + int band = 0; + int num_bands = ARRAY_SIZE(cx24123_bandselect_vals); + struct cx24123_bandselect_val *bsv = NULL; + struct cx24123_AGC_val *agcv = NULL; + + /* Defaults for low freq, low rate */ + state->VCAarg = cx24123_AGC_vals[0].VCAprogdata; + state->VGAarg = cx24123_AGC_vals[0].VGAprogdata; + state->bandselectarg = cx24123_bandselect_vals[0].progdata; + vco_div = cx24123_bandselect_vals[0].VCOdivider; + + /* For the given symbol rate, determine the VCA, VGA and + * FILTUNE programming bits */ + for (i = 0; i < ARRAY_SIZE(cx24123_AGC_vals); i++) { + agcv = &cx24123_AGC_vals[i]; + if ((agcv->symbolrate_low <= p->symbol_rate) && + (agcv->symbolrate_high >= p->symbol_rate)) { + state->VCAarg = agcv->VCAprogdata; + state->VGAarg = agcv->VGAprogdata; + state->FILTune = agcv->FILTune; + } + } + + /* determine the band to use */ + if (force_band < 1 || force_band > num_bands) { + for (i = 0; i < num_bands; i++) { + bsv = &cx24123_bandselect_vals[i]; + if ((bsv->freq_low <= p->frequency) && + (bsv->freq_high >= p->frequency)) + band = i; + } + } else + band = force_band - 1; + + state->bandselectarg = cx24123_bandselect_vals[band].progdata; + vco_div = cx24123_bandselect_vals[band].VCOdivider; + + /* determine the charge pump current */ + if (p->frequency < (cx24123_bandselect_vals[band].freq_low + + cx24123_bandselect_vals[band].freq_high) / 2) + pump = 0x01; + else + pump = 0x02; + + /* Determine the N/A dividers for the requested lband freq (in kHz). */ + /* Note: the reference divider R=10, frequency is in KHz, + * XTAL is in Hz */ + ndiv = (((p->frequency * vco_div * 10) / + (2 * XTAL / 1000)) / 32) & 0x1ff; + adiv = (((p->frequency * vco_div * 10) / + (2 * XTAL / 1000)) % 32) & 0x1f; + + if (adiv == 0 && ndiv > 0) + ndiv--; + + /* control bits 11, refdiv 11, charge pump polarity 1, + * charge pump current, ndiv, adiv */ + state->pllarg = (3 << 19) | (3 << 17) | (1 << 16) | + (pump << 14) | (ndiv << 5) | adiv; + + return 0; +} + +/* + * Tuner data is 21 bits long, must be left-aligned in data. + * Tuner cx24109 is written through a dedicated 3wire interface + * on the demod chip. + */ +static int cx24123_pll_writereg(struct dvb_frontend *fe, u32 data) +{ + struct cx24123_state *state = fe->demodulator_priv; + unsigned long timeout; + + dprintk("pll writereg called, data=0x%08x\n", data); + + /* align the 21 bytes into to bit23 boundary */ + data = data << 3; + + /* Reset the demod pll word length to 0x15 bits */ + cx24123_writereg(state, 0x21, 0x15); + + /* write the msb 8 bits, wait for the send to be completed */ + timeout = jiffies + msecs_to_jiffies(40); + cx24123_writereg(state, 0x22, (data >> 16) & 0xff); + while ((cx24123_readreg(state, 0x20) & 0x40) == 0) { + if (time_after(jiffies, timeout)) { + err("%s: demodulator is not responding, "\ + "possibly hung, aborting.\n", __func__); + return -EREMOTEIO; + } + msleep(10); + } + + /* send another 8 bytes, wait for the send to be completed */ + timeout = jiffies + msecs_to_jiffies(40); + cx24123_writereg(state, 0x22, (data >> 8) & 0xff); + while ((cx24123_readreg(state, 0x20) & 0x40) == 0) { + if (time_after(jiffies, timeout)) { + err("%s: demodulator is not responding, "\ + "possibly hung, aborting.\n", __func__); + return -EREMOTEIO; + } + msleep(10); + } + + /* send the lower 5 bits of this byte, padded with 3 LBB, + * wait for the send to be completed */ + timeout = jiffies + msecs_to_jiffies(40); + cx24123_writereg(state, 0x22, (data) & 0xff); + while ((cx24123_readreg(state, 0x20) & 0x80)) { + if (time_after(jiffies, timeout)) { + err("%s: demodulator is not responding," \ + "possibly hung, aborting.\n", __func__); + return -EREMOTEIO; + } + msleep(10); + } + + /* Trigger the demod to configure the tuner */ + cx24123_writereg(state, 0x20, cx24123_readreg(state, 0x20) | 2); + cx24123_writereg(state, 0x20, cx24123_readreg(state, 0x20) & 0xfd); + + return 0; +} + +static int cx24123_pll_tune(struct dvb_frontend *fe) +{ + struct dtv_frontend_properties *p = &fe->dtv_property_cache; + struct cx24123_state *state = fe->demodulator_priv; + u8 val; + + dprintk("frequency=%i\n", p->frequency); + + if (cx24123_pll_calculate(fe) != 0) { + err("%s: cx24123_pll_calcutate failed\n", __func__); + return -EINVAL; + } + + /* Write the new VCO/VGA */ + cx24123_pll_writereg(fe, state->VCAarg); + cx24123_pll_writereg(fe, state->VGAarg); + + /* Write the new bandselect and pll args */ + cx24123_pll_writereg(fe, state->bandselectarg); + cx24123_pll_writereg(fe, state->pllarg); + + /* set the FILTUNE voltage */ + val = cx24123_readreg(state, 0x28) & ~0x3; + cx24123_writereg(state, 0x27, state->FILTune >> 2); + cx24123_writereg(state, 0x28, val | (state->FILTune & 0x3)); + + dprintk("pll tune VCA=%d, band=%d, pll=%d\n", state->VCAarg, + state->bandselectarg, state->pllarg); + + return 0; +} + + +/* + * 0x23: + * [7:7] = BTI enabled + * [6:6] = I2C repeater enabled + * [5:5] = I2C repeater start + * [0:0] = BTI start + */ + +/* mode == 1 -> i2c-repeater, 0 -> bti */ +static int cx24123_repeater_mode(struct cx24123_state *state, u8 mode, u8 start) +{ + u8 r = cx24123_readreg(state, 0x23) & 0x1e; + if (mode) + r |= (1 << 6) | (start << 5); + else + r |= (1 << 7) | (start); + return cx24123_writereg(state, 0x23, r); +} + +static int cx24123_initfe(struct dvb_frontend *fe) +{ + struct cx24123_state *state = fe->demodulator_priv; + int i; + + dprintk("init frontend\n"); + + /* Configure the demod to a good set of defaults */ + for (i = 0; i < ARRAY_SIZE(cx24123_regdata); i++) + cx24123_writereg(state, cx24123_regdata[i].reg, + cx24123_regdata[i].data); + + /* Set the LNB polarity */ + if (state->config->lnb_polarity) + cx24123_writereg(state, 0x32, + cx24123_readreg(state, 0x32) | 0x02); + + if (state->config->dont_use_pll) + cx24123_repeater_mode(state, 1, 0); + + return 0; +} + +static int cx24123_set_voltage(struct dvb_frontend *fe, + fe_sec_voltage_t voltage) +{ + struct cx24123_state *state = fe->demodulator_priv; + u8 val; + + val = cx24123_readreg(state, 0x29) & ~0x40; + + switch (voltage) { + case SEC_VOLTAGE_13: + dprintk("setting voltage 13V\n"); + return cx24123_writereg(state, 0x29, val & 0x7f); + case SEC_VOLTAGE_18: + dprintk("setting voltage 18V\n"); + return cx24123_writereg(state, 0x29, val | 0x80); + case SEC_VOLTAGE_OFF: + /* already handled in cx88-dvb */ + return 0; + default: + return -EINVAL; + }; + + return 0; +} + +/* wait for diseqc queue to become ready (or timeout) */ +static void cx24123_wait_for_diseqc(struct cx24123_state *state) +{ + unsigned long timeout = jiffies + msecs_to_jiffies(200); + while (!(cx24123_readreg(state, 0x29) & 0x40)) { + if (time_after(jiffies, timeout)) { + err("%s: diseqc queue not ready, " \ + "command may be lost.\n", __func__); + break; + } + msleep(10); + } +} + +static int cx24123_send_diseqc_msg(struct dvb_frontend *fe, + struct dvb_diseqc_master_cmd *cmd) +{ + struct cx24123_state *state = fe->demodulator_priv; + int i, val, tone; + + dprintk("\n"); + + /* stop continuous tone if enabled */ + tone = cx24123_readreg(state, 0x29); + if (tone & 0x10) + cx24123_writereg(state, 0x29, tone & ~0x50); + + /* wait for diseqc queue ready */ + cx24123_wait_for_diseqc(state); + + /* select tone mode */ + cx24123_writereg(state, 0x2a, cx24123_readreg(state, 0x2a) & 0xfb); + + for (i = 0; i < cmd->msg_len; i++) + cx24123_writereg(state, 0x2C + i, cmd->msg[i]); + + val = cx24123_readreg(state, 0x29); + cx24123_writereg(state, 0x29, ((val & 0x90) | 0x40) | + ((cmd->msg_len-3) & 3)); + + /* wait for diseqc message to finish sending */ + cx24123_wait_for_diseqc(state); + + /* restart continuous tone if enabled */ + if (tone & 0x10) + cx24123_writereg(state, 0x29, tone & ~0x40); + + return 0; +} + +static int cx24123_diseqc_send_burst(struct dvb_frontend *fe, + fe_sec_mini_cmd_t burst) +{ + struct cx24123_state *state = fe->demodulator_priv; + int val, tone; + + dprintk("\n"); + + /* stop continuous tone if enabled */ + tone = cx24123_readreg(state, 0x29); + if (tone & 0x10) + cx24123_writereg(state, 0x29, tone & ~0x50); + + /* wait for diseqc queue ready */ + cx24123_wait_for_diseqc(state); + + /* select tone mode */ + cx24123_writereg(state, 0x2a, cx24123_readreg(state, 0x2a) | 0x4); + msleep(30); + val = cx24123_readreg(state, 0x29); + if (burst == SEC_MINI_A) + cx24123_writereg(state, 0x29, ((val & 0x90) | 0x40 | 0x00)); + else if (burst == SEC_MINI_B) + cx24123_writereg(state, 0x29, ((val & 0x90) | 0x40 | 0x08)); + else + return -EINVAL; + + cx24123_wait_for_diseqc(state); + cx24123_writereg(state, 0x2a, cx24123_readreg(state, 0x2a) & 0xfb); + + /* restart continuous tone if enabled */ + if (tone & 0x10) + cx24123_writereg(state, 0x29, tone & ~0x40); + + return 0; +} + +static int cx24123_read_status(struct dvb_frontend *fe, fe_status_t *status) +{ + struct cx24123_state *state = fe->demodulator_priv; + int sync = cx24123_readreg(state, 0x14); + + *status = 0; + if (state->config->dont_use_pll) { + u32 tun_status = 0; + if (fe->ops.tuner_ops.get_status) + fe->ops.tuner_ops.get_status(fe, &tun_status); + if (tun_status & TUNER_STATUS_LOCKED) + *status |= FE_HAS_SIGNAL; + } else { + int lock = cx24123_readreg(state, 0x20); + if (lock & 0x01) + *status |= FE_HAS_SIGNAL; + } + + if (sync & 0x02) + *status |= FE_HAS_CARRIER; /* Phase locked */ + if (sync & 0x04) + *status |= FE_HAS_VITERBI; + + /* Reed-Solomon Status */ + if (sync & 0x08) + *status |= FE_HAS_SYNC; + if (sync & 0x80) + *status |= FE_HAS_LOCK; /*Full Sync */ + + return 0; +} + +/* + * Configured to return the measurement of errors in blocks, + * because no UCBLOCKS value is available, so this value doubles up + * to satisfy both measurements. + */ +static int cx24123_read_ber(struct dvb_frontend *fe, u32 *ber) +{ + struct cx24123_state *state = fe->demodulator_priv; + + /* The true bit error rate is this value divided by + the window size (set as 256 * 255) */ + *ber = ((cx24123_readreg(state, 0x1c) & 0x3f) << 16) | + (cx24123_readreg(state, 0x1d) << 8 | + cx24123_readreg(state, 0x1e)); + + dprintk("BER = %d\n", *ber); + + return 0; +} + +static int cx24123_read_signal_strength(struct dvb_frontend *fe, + u16 *signal_strength) +{ + struct cx24123_state *state = fe->demodulator_priv; + + /* larger = better */ + *signal_strength = cx24123_readreg(state, 0x3b) << 8; + + dprintk("Signal strength = %d\n", *signal_strength); + + return 0; +} + +static int cx24123_read_snr(struct dvb_frontend *fe, u16 *snr) +{ + struct cx24123_state *state = fe->demodulator_priv; + + /* Inverted raw Es/N0 count, totally bogus but better than the + BER threshold. */ + *snr = 65535 - (((u16)cx24123_readreg(state, 0x18) << 8) | + (u16)cx24123_readreg(state, 0x19)); + + dprintk("read S/N index = %d\n", *snr); + + return 0; +} + +static int cx24123_set_frontend(struct dvb_frontend *fe) +{ + struct cx24123_state *state = fe->demodulator_priv; + struct dtv_frontend_properties *p = &fe->dtv_property_cache; + + dprintk("\n"); + + if (state->config->set_ts_params) + state->config->set_ts_params(fe, 0); + + state->currentfreq = p->frequency; + state->currentsymbolrate = p->symbol_rate; + + cx24123_set_inversion(state, p->inversion); + cx24123_set_fec(state, p->fec_inner); + cx24123_set_symbolrate(state, p->symbol_rate); + + if (!state->config->dont_use_pll) + cx24123_pll_tune(fe); + else if (fe->ops.tuner_ops.set_params) + fe->ops.tuner_ops.set_params(fe); + else + err("it seems I don't have a tuner..."); + + /* Enable automatic acquisition and reset cycle */ + cx24123_writereg(state, 0x03, (cx24123_readreg(state, 0x03) | 0x07)); + cx24123_writereg(state, 0x00, 0x10); + cx24123_writereg(state, 0x00, 0); + + if (state->config->agc_callback) + state->config->agc_callback(fe); + + return 0; +} + +static int cx24123_get_frontend(struct dvb_frontend *fe) +{ + struct dtv_frontend_properties *p = &fe->dtv_property_cache; + struct cx24123_state *state = fe->demodulator_priv; + + dprintk("\n"); + + if (cx24123_get_inversion(state, &p->inversion) != 0) { + err("%s: Failed to get inversion status\n", __func__); + return -EREMOTEIO; + } + if (cx24123_get_fec(state, &p->fec_inner) != 0) { + err("%s: Failed to get fec status\n", __func__); + return -EREMOTEIO; + } + p->frequency = state->currentfreq; + p->symbol_rate = state->currentsymbolrate; + + return 0; +} + +static int cx24123_set_tone(struct dvb_frontend *fe, fe_sec_tone_mode_t tone) +{ + struct cx24123_state *state = fe->demodulator_priv; + u8 val; + + /* wait for diseqc queue ready */ + cx24123_wait_for_diseqc(state); + + val = cx24123_readreg(state, 0x29) & ~0x40; + + switch (tone) { + case SEC_TONE_ON: + dprintk("setting tone on\n"); + return cx24123_writereg(state, 0x29, val | 0x10); + case SEC_TONE_OFF: + dprintk("setting tone off\n"); + return cx24123_writereg(state, 0x29, val & 0xef); + default: + err("CASE reached default with tone=%d\n", tone); + return -EINVAL; + } + + return 0; +} + +static int cx24123_tune(struct dvb_frontend *fe, + bool re_tune, + unsigned int mode_flags, + unsigned int *delay, + fe_status_t *status) +{ + int retval = 0; + + if (re_tune) + retval = cx24123_set_frontend(fe); + + if (!(mode_flags & FE_TUNE_MODE_ONESHOT)) + cx24123_read_status(fe, status); + *delay = HZ/10; + + return retval; +} + +static int cx24123_get_algo(struct dvb_frontend *fe) +{ + return 1; /* FE_ALGO_HW */ +} + +static void cx24123_release(struct dvb_frontend *fe) +{ + struct cx24123_state *state = fe->demodulator_priv; + dprintk("\n"); + i2c_del_adapter(&state->tuner_i2c_adapter); + kfree(state); +} + +static int cx24123_tuner_i2c_tuner_xfer(struct i2c_adapter *i2c_adap, + struct i2c_msg msg[], int num) +{ + struct cx24123_state *state = i2c_get_adapdata(i2c_adap); + /* this repeater closes after the first stop */ + cx24123_repeater_mode(state, 1, 1); + return i2c_transfer(state->i2c, msg, num); +} + +static u32 cx24123_tuner_i2c_func(struct i2c_adapter *adapter) +{ + return I2C_FUNC_I2C; +} + +static struct i2c_algorithm cx24123_tuner_i2c_algo = { + .master_xfer = cx24123_tuner_i2c_tuner_xfer, + .functionality = cx24123_tuner_i2c_func, +}; + +struct i2c_adapter * + cx24123_get_tuner_i2c_adapter(struct dvb_frontend *fe) +{ + struct cx24123_state *state = fe->demodulator_priv; + return &state->tuner_i2c_adapter; +} +EXPORT_SYMBOL(cx24123_get_tuner_i2c_adapter); + +static struct dvb_frontend_ops cx24123_ops; + +struct dvb_frontend *cx24123_attach(const struct cx24123_config *config, + struct i2c_adapter *i2c) +{ + /* allocate memory for the internal state */ + struct cx24123_state *state = + kzalloc(sizeof(struct cx24123_state), GFP_KERNEL); + + dprintk("\n"); + if (state == NULL) { + err("Unable to kzalloc\n"); + goto error; + } + + /* setup the state */ + state->config = config; + state->i2c = i2c; + + /* check if the demod is there */ + state->demod_rev = cx24123_readreg(state, 0x00); + switch (state->demod_rev) { + case 0xe1: + info("detected CX24123C\n"); + break; + case 0xd1: + info("detected CX24123\n"); + break; + default: + err("wrong demod revision: %x\n", state->demod_rev); + goto error; + } + + /* create dvb_frontend */ + memcpy(&state->frontend.ops, &cx24123_ops, + sizeof(struct dvb_frontend_ops)); + state->frontend.demodulator_priv = state; + + /* create tuner i2c adapter */ + if (config->dont_use_pll) + cx24123_repeater_mode(state, 1, 0); + + strlcpy(state->tuner_i2c_adapter.name, "CX24123 tuner I2C bus", + sizeof(state->tuner_i2c_adapter.name)); + state->tuner_i2c_adapter.algo = &cx24123_tuner_i2c_algo; + state->tuner_i2c_adapter.algo_data = NULL; + i2c_set_adapdata(&state->tuner_i2c_adapter, state); + if (i2c_add_adapter(&state->tuner_i2c_adapter) < 0) { + err("tuner i2c bus could not be initialized\n"); + goto error; + } + + return &state->frontend; + +error: + kfree(state); + + return NULL; +} +EXPORT_SYMBOL(cx24123_attach); + +static struct dvb_frontend_ops cx24123_ops = { + .delsys = { SYS_DVBS }, + .info = { + .name = "Conexant CX24123/CX24109", + .frequency_min = 950000, + .frequency_max = 2150000, + .frequency_stepsize = 1011, /* kHz for QPSK frontends */ + .frequency_tolerance = 5000, + .symbol_rate_min = 1000000, + .symbol_rate_max = 45000000, + .caps = FE_CAN_INVERSION_AUTO | + FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 | + FE_CAN_FEC_4_5 | FE_CAN_FEC_5_6 | FE_CAN_FEC_6_7 | + FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO | + FE_CAN_QPSK | FE_CAN_RECOVER + }, + + .release = cx24123_release, + + .init = cx24123_initfe, + .set_frontend = cx24123_set_frontend, + .get_frontend = cx24123_get_frontend, + .read_status = cx24123_read_status, + .read_ber = cx24123_read_ber, + .read_signal_strength = cx24123_read_signal_strength, + .read_snr = cx24123_read_snr, + .diseqc_send_master_cmd = cx24123_send_diseqc_msg, + .diseqc_send_burst = cx24123_diseqc_send_burst, + .set_tone = cx24123_set_tone, + .set_voltage = cx24123_set_voltage, + .tune = cx24123_tune, + .get_frontend_algo = cx24123_get_algo, +}; + +MODULE_DESCRIPTION("DVB Frontend module for Conexant " \ + "CX24123/CX24109/CX24113 hardware"); +MODULE_AUTHOR("Steven Toth"); +MODULE_LICENSE("GPL"); + |
