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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 Conexant cx22700 DVB OFDM demodulator driver4 5 Copyright (C) 2001-2002 Convergence Integrated Media GmbH6 Holger Waechtler <holger@convergence.de>7 8 9*/10 11#include <linux/kernel.h>12#include <linux/init.h>13#include <linux/module.h>14#include <linux/string.h>15#include <linux/slab.h>16#include <media/dvb_frontend.h>17#include "cx22700.h"18 19 20struct cx22700_state {21 22 struct i2c_adapter* i2c;23 24 const struct cx22700_config* config;25 26 struct dvb_frontend frontend;27};28 29 30static int debug;31#define dprintk(args...) \32 do { \33 if (debug) printk(KERN_DEBUG "cx22700: " args); \34 } while (0)35 36static u8 init_tab [] = {37 0x04, 0x10,38 0x05, 0x09,39 0x06, 0x00,40 0x08, 0x04,41 0x09, 0x00,42 0x0a, 0x01,43 0x15, 0x40,44 0x16, 0x10,45 0x17, 0x87,46 0x18, 0x17,47 0x1a, 0x10,48 0x25, 0x04,49 0x2e, 0x00,50 0x39, 0x00,51 0x3a, 0x04,52 0x45, 0x08,53 0x46, 0x02,54 0x47, 0x05,55};56 57 58static int cx22700_writereg (struct cx22700_state* state, u8 reg, u8 data)59{60 int ret;61 u8 buf [] = { reg, data };62 struct i2c_msg msg = { .addr = state->config->demod_address, .flags = 0, .buf = buf, .len = 2 };63 64 dprintk ("%s\n", __func__);65 66 ret = i2c_transfer (state->i2c, &msg, 1);67 68 if (ret != 1)69 printk("%s: writereg error (reg == 0x%02x, val == 0x%02x, ret == %i)\n",70 __func__, reg, data, ret);71 72 return (ret != 1) ? -1 : 0;73}74 75static int cx22700_readreg (struct cx22700_state* state, u8 reg)76{77 int ret;78 u8 b0 [] = { reg };79 u8 b1 [] = { 0 };80 struct i2c_msg msg [] = { { .addr = state->config->demod_address, .flags = 0, .buf = b0, .len = 1 },81 { .addr = state->config->demod_address, .flags = I2C_M_RD, .buf = b1, .len = 1 } };82 83 dprintk ("%s\n", __func__);84 85 ret = i2c_transfer (state->i2c, msg, 2);86 87 if (ret != 2) return -EIO;88 89 return b1[0];90}91 92static int cx22700_set_inversion (struct cx22700_state* state, int inversion)93{94 u8 val;95 96 dprintk ("%s\n", __func__);97 98 switch (inversion) {99 case INVERSION_AUTO:100 return -EOPNOTSUPP;101 case INVERSION_ON:102 val = cx22700_readreg (state, 0x09);103 return cx22700_writereg (state, 0x09, val | 0x01);104 case INVERSION_OFF:105 val = cx22700_readreg (state, 0x09);106 return cx22700_writereg (state, 0x09, val & 0xfe);107 default:108 return -EINVAL;109 }110}111 112static int cx22700_set_tps(struct cx22700_state *state,113 struct dtv_frontend_properties *p)114{115 static const u8 qam_tab [4] = { 0, 1, 0, 2 };116 static const u8 fec_tab [6] = { 0, 1, 2, 0, 3, 4 };117 u8 val;118 119 dprintk ("%s\n", __func__);120 121 if (p->code_rate_HP < FEC_1_2 || p->code_rate_HP > FEC_7_8)122 return -EINVAL;123 124 if (p->code_rate_LP < FEC_1_2 || p->code_rate_LP > FEC_7_8)125 return -EINVAL;126 127 if (p->code_rate_HP == FEC_4_5 || p->code_rate_LP == FEC_4_5)128 return -EINVAL;129 130 if ((int)p->guard_interval < GUARD_INTERVAL_1_32 ||131 p->guard_interval > GUARD_INTERVAL_1_4)132 return -EINVAL;133 134 if (p->transmission_mode != TRANSMISSION_MODE_2K &&135 p->transmission_mode != TRANSMISSION_MODE_8K)136 return -EINVAL;137 138 if (p->modulation != QPSK &&139 p->modulation != QAM_16 &&140 p->modulation != QAM_64)141 return -EINVAL;142 143 if ((int)p->hierarchy < HIERARCHY_NONE ||144 p->hierarchy > HIERARCHY_4)145 return -EINVAL;146 147 if (p->bandwidth_hz > 8000000 || p->bandwidth_hz < 6000000)148 return -EINVAL;149 150 if (p->bandwidth_hz == 7000000)151 cx22700_writereg (state, 0x09, cx22700_readreg (state, 0x09 | 0x10));152 else153 cx22700_writereg (state, 0x09, cx22700_readreg (state, 0x09 & ~0x10));154 155 val = qam_tab[p->modulation - QPSK];156 val |= p->hierarchy - HIERARCHY_NONE;157 158 cx22700_writereg (state, 0x04, val);159 160 if (p->code_rate_HP - FEC_1_2 >= sizeof(fec_tab) ||161 p->code_rate_LP - FEC_1_2 >= sizeof(fec_tab))162 return -EINVAL;163 val = fec_tab[p->code_rate_HP - FEC_1_2] << 3;164 val |= fec_tab[p->code_rate_LP - FEC_1_2];165 166 cx22700_writereg (state, 0x05, val);167 168 val = (p->guard_interval - GUARD_INTERVAL_1_32) << 2;169 val |= p->transmission_mode - TRANSMISSION_MODE_2K;170 171 cx22700_writereg (state, 0x06, val);172 173 cx22700_writereg (state, 0x08, 0x04 | 0x02); /* use user tps parameters */174 cx22700_writereg (state, 0x08, 0x04); /* restart acquisition */175 176 return 0;177}178 179static int cx22700_get_tps(struct cx22700_state *state,180 struct dtv_frontend_properties *p)181{182 static const enum fe_modulation qam_tab[3] = { QPSK, QAM_16, QAM_64 };183 static const enum fe_code_rate fec_tab[5] = {184 FEC_1_2, FEC_2_3, FEC_3_4, FEC_5_6, FEC_7_8185 };186 u8 val;187 188 dprintk ("%s\n", __func__);189 190 if (!(cx22700_readreg(state, 0x07) & 0x20)) /* tps valid? */191 return -EAGAIN;192 193 val = cx22700_readreg (state, 0x01);194 195 if ((val & 0x7) > 4)196 p->hierarchy = HIERARCHY_AUTO;197 else198 p->hierarchy = HIERARCHY_NONE + (val & 0x7);199 200 if (((val >> 3) & 0x3) > 2)201 p->modulation = QAM_AUTO;202 else203 p->modulation = qam_tab[(val >> 3) & 0x3];204 205 val = cx22700_readreg (state, 0x02);206 207 if (((val >> 3) & 0x07) > 4)208 p->code_rate_HP = FEC_AUTO;209 else210 p->code_rate_HP = fec_tab[(val >> 3) & 0x07];211 212 if ((val & 0x07) > 4)213 p->code_rate_LP = FEC_AUTO;214 else215 p->code_rate_LP = fec_tab[val & 0x07];216 217 val = cx22700_readreg (state, 0x03);218 219 p->guard_interval = GUARD_INTERVAL_1_32 + ((val >> 6) & 0x3);220 p->transmission_mode = TRANSMISSION_MODE_2K + ((val >> 5) & 0x1);221 222 return 0;223}224 225static int cx22700_init (struct dvb_frontend* fe)226 227{ struct cx22700_state* state = fe->demodulator_priv;228 int i;229 230 dprintk("cx22700_init: init chip\n");231 232 cx22700_writereg (state, 0x00, 0x02); /* soft reset */233 cx22700_writereg (state, 0x00, 0x00);234 235 msleep(10);236 237 for (i=0; i<sizeof(init_tab); i+=2)238 cx22700_writereg (state, init_tab[i], init_tab[i+1]);239 240 cx22700_writereg (state, 0x00, 0x01);241 242 return 0;243}244 245static int cx22700_read_status(struct dvb_frontend *fe, enum fe_status *status)246{247 struct cx22700_state* state = fe->demodulator_priv;248 249 u16 rs_ber = (cx22700_readreg (state, 0x0d) << 9)250 | (cx22700_readreg (state, 0x0e) << 1);251 u8 sync = cx22700_readreg (state, 0x07);252 253 *status = 0;254 255 if (rs_ber < 0xff00)256 *status |= FE_HAS_SIGNAL;257 258 if (sync & 0x20)259 *status |= FE_HAS_CARRIER;260 261 if (sync & 0x10)262 *status |= FE_HAS_VITERBI;263 264 if (sync & 0x10)265 *status |= FE_HAS_SYNC;266 267 if (*status == 0x0f)268 *status |= FE_HAS_LOCK;269 270 return 0;271}272 273static int cx22700_read_ber(struct dvb_frontend* fe, u32* ber)274{275 struct cx22700_state* state = fe->demodulator_priv;276 277 *ber = cx22700_readreg (state, 0x0c) & 0x7f;278 cx22700_writereg (state, 0x0c, 0x00);279 280 return 0;281}282 283static int cx22700_read_signal_strength(struct dvb_frontend* fe, u16* signal_strength)284{285 struct cx22700_state* state = fe->demodulator_priv;286 287 u16 rs_ber = (cx22700_readreg (state, 0x0d) << 9)288 | (cx22700_readreg (state, 0x0e) << 1);289 *signal_strength = ~rs_ber;290 291 return 0;292}293 294static int cx22700_read_snr(struct dvb_frontend* fe, u16* snr)295{296 struct cx22700_state* state = fe->demodulator_priv;297 298 u16 rs_ber = (cx22700_readreg (state, 0x0d) << 9)299 | (cx22700_readreg (state, 0x0e) << 1);300 *snr = ~rs_ber;301 302 return 0;303}304 305static int cx22700_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)306{307 struct cx22700_state* state = fe->demodulator_priv;308 309 *ucblocks = cx22700_readreg (state, 0x0f);310 cx22700_writereg (state, 0x0f, 0x00);311 312 return 0;313}314 315static int cx22700_set_frontend(struct dvb_frontend *fe)316{317 struct dtv_frontend_properties *c = &fe->dtv_property_cache;318 struct cx22700_state* state = fe->demodulator_priv;319 320 cx22700_writereg (state, 0x00, 0x02); /* XXX CHECKME: soft reset*/321 cx22700_writereg (state, 0x00, 0x00);322 323 if (fe->ops.tuner_ops.set_params) {324 fe->ops.tuner_ops.set_params(fe);325 if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0);326 }327 328 cx22700_set_inversion(state, c->inversion);329 cx22700_set_tps(state, c);330 cx22700_writereg (state, 0x37, 0x01); /* PAL loop filter off */331 cx22700_writereg (state, 0x00, 0x01); /* restart acquire */332 333 return 0;334}335 336static int cx22700_get_frontend(struct dvb_frontend *fe,337 struct dtv_frontend_properties *c)338{339 struct cx22700_state* state = fe->demodulator_priv;340 u8 reg09 = cx22700_readreg (state, 0x09);341 342 c->inversion = reg09 & 0x1 ? INVERSION_ON : INVERSION_OFF;343 return cx22700_get_tps(state, c);344}345 346static int cx22700_i2c_gate_ctrl(struct dvb_frontend* fe, int enable)347{348 struct cx22700_state* state = fe->demodulator_priv;349 350 if (enable) {351 return cx22700_writereg(state, 0x0a, 0x00);352 } else {353 return cx22700_writereg(state, 0x0a, 0x01);354 }355}356 357static int cx22700_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings* fesettings)358{359 fesettings->min_delay_ms = 150;360 fesettings->step_size = 166667;361 fesettings->max_drift = 166667*2;362 return 0;363}364 365static void cx22700_release(struct dvb_frontend* fe)366{367 struct cx22700_state* state = fe->demodulator_priv;368 kfree(state);369}370 371static const struct dvb_frontend_ops cx22700_ops;372 373struct dvb_frontend* cx22700_attach(const struct cx22700_config* config,374 struct i2c_adapter* i2c)375{376 struct cx22700_state* state = NULL;377 378 /* allocate memory for the internal state */379 state = kzalloc(sizeof(struct cx22700_state), GFP_KERNEL);380 if (state == NULL) goto error;381 382 /* setup the state */383 state->config = config;384 state->i2c = i2c;385 386 /* check if the demod is there */387 if (cx22700_readreg(state, 0x07) < 0) goto error;388 389 /* create dvb_frontend */390 memcpy(&state->frontend.ops, &cx22700_ops, sizeof(struct dvb_frontend_ops));391 state->frontend.demodulator_priv = state;392 return &state->frontend;393 394error:395 kfree(state);396 return NULL;397}398 399static const struct dvb_frontend_ops cx22700_ops = {400 .delsys = { SYS_DVBT },401 .info = {402 .name = "Conexant CX22700 DVB-T",403 .frequency_min_hz = 470 * MHz,404 .frequency_max_hz = 860 * MHz,405 .frequency_stepsize_hz = 166667,406 .caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |407 FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |408 FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_64 |409 FE_CAN_RECOVER410 },411 412 .release = cx22700_release,413 414 .init = cx22700_init,415 .i2c_gate_ctrl = cx22700_i2c_gate_ctrl,416 417 .set_frontend = cx22700_set_frontend,418 .get_frontend = cx22700_get_frontend,419 .get_tune_settings = cx22700_get_tune_settings,420 421 .read_status = cx22700_read_status,422 .read_ber = cx22700_read_ber,423 .read_signal_strength = cx22700_read_signal_strength,424 .read_snr = cx22700_read_snr,425 .read_ucblocks = cx22700_read_ucblocks,426};427 428module_param(debug, int, 0644);429MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");430 431MODULE_DESCRIPTION("Conexant CX22700 DVB-T Demodulator driver");432MODULE_AUTHOR("Holger Waechtler");433MODULE_LICENSE("GPL");434 435EXPORT_SYMBOL_GPL(cx22700_attach);436