2 Conexant cx22700 DVB OFDM demodulator driver
4 Copyright (C) 2001-2002 Convergence Integrated Media GmbH
5 Holger Waechtler <holger@convergence.de>
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 #include <linux/kernel.h>
24 #include <linux/init.h>
25 #include <linux/module.h>
26 #include <linux/moduleparam.h>
27 #include <linux/string.h>
28 #include <linux/slab.h>
29 #include "dvb_frontend.h"
33 struct cx22700_state {
35 struct i2c_adapter* i2c;
37 const struct cx22700_config* config;
39 struct dvb_frontend frontend;
44 #define dprintk(args...) \
46 if (debug) printk(KERN_DEBUG "cx22700: " args); \
49 static u8 init_tab [] = {
71 static int cx22700_writereg (struct cx22700_state* state, u8 reg, u8 data)
74 u8 buf [] = { reg, data };
75 struct i2c_msg msg = { .addr = state->config->demod_address, .flags = 0, .buf = buf, .len = 2 };
77 dprintk ("%s\n", __FUNCTION__);
79 ret = i2c_transfer (state->i2c, &msg, 1);
82 printk("%s: writereg error (reg == 0x%02x, val == 0x%02x, ret == %i)\n",
83 __FUNCTION__, reg, data, ret);
85 return (ret != 1) ? -1 : 0;
88 static int cx22700_readreg (struct cx22700_state* state, u8 reg)
93 struct i2c_msg msg [] = { { .addr = state->config->demod_address, .flags = 0, .buf = b0, .len = 1 },
94 { .addr = state->config->demod_address, .flags = I2C_M_RD, .buf = b1, .len = 1 } };
96 dprintk ("%s\n", __FUNCTION__);
98 ret = i2c_transfer (state->i2c, msg, 2);
100 if (ret != 2) return -EIO;
105 static int cx22700_set_inversion (struct cx22700_state* state, int inversion)
109 dprintk ("%s\n", __FUNCTION__);
115 val = cx22700_readreg (state, 0x09);
116 return cx22700_writereg (state, 0x09, val | 0x01);
118 val = cx22700_readreg (state, 0x09);
119 return cx22700_writereg (state, 0x09, val & 0xfe);
125 static int cx22700_set_tps (struct cx22700_state *state, struct dvb_ofdm_parameters *p)
127 static const u8 qam_tab [4] = { 0, 1, 0, 2 };
128 static const u8 fec_tab [6] = { 0, 1, 2, 0, 3, 4 };
131 dprintk ("%s\n", __FUNCTION__);
133 if (p->code_rate_HP < FEC_1_2 || p->code_rate_HP > FEC_7_8)
136 if (p->code_rate_LP < FEC_1_2 || p->code_rate_LP > FEC_7_8)
139 if (p->code_rate_HP == FEC_4_5 || p->code_rate_LP == FEC_4_5)
142 if (p->guard_interval < GUARD_INTERVAL_1_32 ||
143 p->guard_interval > GUARD_INTERVAL_1_4)
146 if (p->transmission_mode != TRANSMISSION_MODE_2K &&
147 p->transmission_mode != TRANSMISSION_MODE_8K)
150 if (p->constellation != QPSK &&
151 p->constellation != QAM_16 &&
152 p->constellation != QAM_64)
155 if (p->hierarchy_information < HIERARCHY_NONE ||
156 p->hierarchy_information > HIERARCHY_4)
159 if (p->bandwidth < BANDWIDTH_8_MHZ && p->bandwidth > BANDWIDTH_6_MHZ)
162 if (p->bandwidth == BANDWIDTH_7_MHZ)
163 cx22700_writereg (state, 0x09, cx22700_readreg (state, 0x09 | 0x10));
165 cx22700_writereg (state, 0x09, cx22700_readreg (state, 0x09 & ~0x10));
167 val = qam_tab[p->constellation - QPSK];
168 val |= p->hierarchy_information - HIERARCHY_NONE;
170 cx22700_writereg (state, 0x04, val);
172 val = fec_tab[p->code_rate_HP - FEC_1_2] << 3;
173 val |= fec_tab[p->code_rate_LP - FEC_1_2];
175 cx22700_writereg (state, 0x05, val);
177 val = (p->guard_interval - GUARD_INTERVAL_1_32) << 2;
178 val |= p->transmission_mode - TRANSMISSION_MODE_2K;
180 cx22700_writereg (state, 0x06, val);
182 cx22700_writereg (state, 0x08, 0x04 | 0x02); /* use user tps parameters */
183 cx22700_writereg (state, 0x08, 0x04); /* restart aquisition */
188 static int cx22700_get_tps (struct cx22700_state* state, struct dvb_ofdm_parameters *p)
190 static const fe_modulation_t qam_tab [3] = { QPSK, QAM_16, QAM_64 };
191 static const fe_code_rate_t fec_tab [5] = { FEC_1_2, FEC_2_3, FEC_3_4,
195 dprintk ("%s\n", __FUNCTION__);
197 if (!(cx22700_readreg(state, 0x07) & 0x20)) /* tps valid? */
200 val = cx22700_readreg (state, 0x01);
203 p->hierarchy_information = HIERARCHY_AUTO;
205 p->hierarchy_information = HIERARCHY_NONE + (val & 0x7);
207 if (((val >> 3) & 0x3) > 2)
208 p->constellation = QAM_AUTO;
210 p->constellation = qam_tab[(val >> 3) & 0x3];
212 val = cx22700_readreg (state, 0x02);
214 if (((val >> 3) & 0x07) > 4)
215 p->code_rate_HP = FEC_AUTO;
217 p->code_rate_HP = fec_tab[(val >> 3) & 0x07];
219 if ((val & 0x07) > 4)
220 p->code_rate_LP = FEC_AUTO;
222 p->code_rate_LP = fec_tab[val & 0x07];
224 val = cx22700_readreg (state, 0x03);
226 p->guard_interval = GUARD_INTERVAL_1_32 + ((val >> 6) & 0x3);
227 p->transmission_mode = TRANSMISSION_MODE_2K + ((val >> 5) & 0x1);
232 static int cx22700_init (struct dvb_frontend* fe)
234 { struct cx22700_state* state = fe->demodulator_priv;
237 dprintk("cx22700_init: init chip\n");
239 cx22700_writereg (state, 0x00, 0x02); /* soft reset */
240 cx22700_writereg (state, 0x00, 0x00);
244 for (i=0; i<sizeof(init_tab); i+=2)
245 cx22700_writereg (state, init_tab[i], init_tab[i+1]);
247 cx22700_writereg (state, 0x00, 0x01);
252 static int cx22700_read_status(struct dvb_frontend* fe, fe_status_t* status)
254 struct cx22700_state* state = fe->demodulator_priv;
256 u16 rs_ber = (cx22700_readreg (state, 0x0d) << 9)
257 | (cx22700_readreg (state, 0x0e) << 1);
258 u8 sync = cx22700_readreg (state, 0x07);
263 *status |= FE_HAS_SIGNAL;
266 *status |= FE_HAS_CARRIER;
269 *status |= FE_HAS_VITERBI;
272 *status |= FE_HAS_SYNC;
275 *status |= FE_HAS_LOCK;
280 static int cx22700_read_ber(struct dvb_frontend* fe, u32* ber)
282 struct cx22700_state* state = fe->demodulator_priv;
284 *ber = cx22700_readreg (state, 0x0c) & 0x7f;
285 cx22700_writereg (state, 0x0c, 0x00);
290 static int cx22700_read_signal_strength(struct dvb_frontend* fe, u16* signal_strength)
292 struct cx22700_state* state = fe->demodulator_priv;
294 u16 rs_ber = (cx22700_readreg (state, 0x0d) << 9)
295 | (cx22700_readreg (state, 0x0e) << 1);
296 *signal_strength = ~rs_ber;
301 static int cx22700_read_snr(struct dvb_frontend* fe, u16* snr)
303 struct cx22700_state* state = fe->demodulator_priv;
305 u16 rs_ber = (cx22700_readreg (state, 0x0d) << 9)
306 | (cx22700_readreg (state, 0x0e) << 1);
312 static int cx22700_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
314 struct cx22700_state* state = fe->demodulator_priv;
316 *ucblocks = cx22700_readreg (state, 0x0f);
317 cx22700_writereg (state, 0x0f, 0x00);
322 static int cx22700_set_frontend(struct dvb_frontend* fe, struct dvb_frontend_parameters *p)
324 struct cx22700_state* state = fe->demodulator_priv;
326 cx22700_writereg (state, 0x00, 0x02); /* XXX CHECKME: soft reset*/
327 cx22700_writereg (state, 0x00, 0x00);
329 if (fe->ops.tuner_ops.set_params) {
330 fe->ops.tuner_ops.set_params(fe, p);
331 if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0);
334 cx22700_set_inversion (state, p->inversion);
335 cx22700_set_tps (state, &p->u.ofdm);
336 cx22700_writereg (state, 0x37, 0x01); /* PAL loop filter off */
337 cx22700_writereg (state, 0x00, 0x01); /* restart acquire */
342 static int cx22700_get_frontend(struct dvb_frontend* fe, struct dvb_frontend_parameters *p)
344 struct cx22700_state* state = fe->demodulator_priv;
345 u8 reg09 = cx22700_readreg (state, 0x09);
347 p->inversion = reg09 & 0x1 ? INVERSION_ON : INVERSION_OFF;
348 return cx22700_get_tps (state, &p->u.ofdm);
351 static int cx22700_i2c_gate_ctrl(struct dvb_frontend* fe, int enable)
353 struct cx22700_state* state = fe->demodulator_priv;
356 return cx22700_writereg(state, 0x0a, 0x00);
358 return cx22700_writereg(state, 0x0a, 0x01);
362 static int cx22700_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings* fesettings)
364 fesettings->min_delay_ms = 150;
365 fesettings->step_size = 166667;
366 fesettings->max_drift = 166667*2;
370 static void cx22700_release(struct dvb_frontend* fe)
372 struct cx22700_state* state = fe->demodulator_priv;
376 static struct dvb_frontend_ops cx22700_ops;
378 struct dvb_frontend* cx22700_attach(const struct cx22700_config* config,
379 struct i2c_adapter* i2c)
381 struct cx22700_state* state = NULL;
383 /* allocate memory for the internal state */
384 state = kmalloc(sizeof(struct cx22700_state), GFP_KERNEL);
385 if (state == NULL) goto error;
387 /* setup the state */
388 state->config = config;
391 /* check if the demod is there */
392 if (cx22700_readreg(state, 0x07) < 0) goto error;
394 /* create dvb_frontend */
395 memcpy(&state->frontend.ops, &cx22700_ops, sizeof(struct dvb_frontend_ops));
396 state->frontend.demodulator_priv = state;
397 return &state->frontend;
404 static struct dvb_frontend_ops cx22700_ops = {
407 .name = "Conexant CX22700 DVB-T",
409 .frequency_min = 470000000,
410 .frequency_max = 860000000,
411 .frequency_stepsize = 166667,
412 .caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
413 FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
414 FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_64 |
418 .release = cx22700_release,
420 .init = cx22700_init,
421 .i2c_gate_ctrl = cx22700_i2c_gate_ctrl,
423 .set_frontend = cx22700_set_frontend,
424 .get_frontend = cx22700_get_frontend,
425 .get_tune_settings = cx22700_get_tune_settings,
427 .read_status = cx22700_read_status,
428 .read_ber = cx22700_read_ber,
429 .read_signal_strength = cx22700_read_signal_strength,
430 .read_snr = cx22700_read_snr,
431 .read_ucblocks = cx22700_read_ucblocks,
434 module_param(debug, int, 0644);
435 MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
437 MODULE_DESCRIPTION("Conexant CX22700 DVB-T Demodulator driver");
438 MODULE_AUTHOR("Holger Waechtler");
439 MODULE_LICENSE("GPL");
441 EXPORT_SYMBOL(cx22700_attach);