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 struct dvb_frontend_ops ops;
39 const struct cx22700_config* config;
41 struct dvb_frontend frontend;
46 #define dprintk(args...) \
48 if (debug) printk(KERN_DEBUG "cx22700: " args); \
51 static u8 init_tab [] = {
73 static int cx22700_writereg (struct cx22700_state* state, u8 reg, u8 data)
76 u8 buf [] = { reg, data };
77 struct i2c_msg msg = { .addr = state->config->demod_address, .flags = 0, .buf = buf, .len = 2 };
79 dprintk ("%s\n", __FUNCTION__);
81 ret = i2c_transfer (state->i2c, &msg, 1);
84 printk("%s: writereg error (reg == 0x%02x, val == 0x%02x, ret == %i)\n",
85 __FUNCTION__, reg, data, ret);
87 return (ret != 1) ? -1 : 0;
90 static int cx22700_readreg (struct cx22700_state* state, u8 reg)
95 struct i2c_msg msg [] = { { .addr = state->config->demod_address, .flags = 0, .buf = b0, .len = 1 },
96 { .addr = state->config->demod_address, .flags = I2C_M_RD, .buf = b1, .len = 1 } };
98 dprintk ("%s\n", __FUNCTION__);
100 ret = i2c_transfer (state->i2c, msg, 2);
102 if (ret != 2) return -EIO;
107 static int cx22700_set_inversion (struct cx22700_state* state, int inversion)
111 dprintk ("%s\n", __FUNCTION__);
117 val = cx22700_readreg (state, 0x09);
118 return cx22700_writereg (state, 0x09, val | 0x01);
120 val = cx22700_readreg (state, 0x09);
121 return cx22700_writereg (state, 0x09, val & 0xfe);
127 static int cx22700_set_tps (struct cx22700_state *state, struct dvb_ofdm_parameters *p)
129 static const u8 qam_tab [4] = { 0, 1, 0, 2 };
130 static const u8 fec_tab [6] = { 0, 1, 2, 0, 3, 4 };
133 dprintk ("%s\n", __FUNCTION__);
135 if (p->code_rate_HP < FEC_1_2 || p->code_rate_HP > FEC_7_8)
138 if (p->code_rate_LP < FEC_1_2 || p->code_rate_LP > FEC_7_8)
140 if (p->code_rate_HP == FEC_4_5 || p->code_rate_LP == FEC_4_5)
143 if (p->guard_interval < GUARD_INTERVAL_1_32 ||
144 p->guard_interval > GUARD_INTERVAL_1_4)
147 if (p->transmission_mode != TRANSMISSION_MODE_2K &&
148 p->transmission_mode != TRANSMISSION_MODE_8K)
151 if (p->constellation != QPSK &&
152 p->constellation != QAM_16 &&
153 p->constellation != QAM_64)
156 if (p->hierarchy_information < HIERARCHY_NONE ||
157 p->hierarchy_information > HIERARCHY_4)
160 if (p->bandwidth < BANDWIDTH_8_MHZ && p->bandwidth > BANDWIDTH_6_MHZ)
163 if (p->bandwidth == BANDWIDTH_7_MHZ)
164 cx22700_writereg (state, 0x09, cx22700_readreg (state, 0x09 | 0x10));
166 cx22700_writereg (state, 0x09, cx22700_readreg (state, 0x09 & ~0x10));
168 val = qam_tab[p->constellation - QPSK];
169 val |= p->hierarchy_information - HIERARCHY_NONE;
171 cx22700_writereg (state, 0x04, val);
173 val = fec_tab[p->code_rate_HP - FEC_1_2] << 3;
174 val |= fec_tab[p->code_rate_LP - FEC_1_2];
176 cx22700_writereg (state, 0x05, val);
178 val = (p->guard_interval - GUARD_INTERVAL_1_32) << 2;
179 val |= p->transmission_mode - TRANSMISSION_MODE_2K;
181 cx22700_writereg (state, 0x06, val);
183 cx22700_writereg (state, 0x08, 0x04 | 0x02); /* use user tps parameters */
184 cx22700_writereg (state, 0x08, 0x04); /* restart aquisition */
189 static int cx22700_get_tps (struct cx22700_state* state, struct dvb_ofdm_parameters *p)
191 static const fe_modulation_t qam_tab [3] = { QPSK, QAM_16, QAM_64 };
192 static const fe_code_rate_t fec_tab [5] = { FEC_1_2, FEC_2_3, FEC_3_4,
196 dprintk ("%s\n", __FUNCTION__);
198 if (!(cx22700_readreg(state, 0x07) & 0x20)) /* tps valid? */
201 val = cx22700_readreg (state, 0x01);
204 p->hierarchy_information = HIERARCHY_AUTO;
206 p->hierarchy_information = HIERARCHY_NONE + (val & 0x7);
208 if (((val >> 3) & 0x3) > 2)
209 p->constellation = QAM_AUTO;
211 p->constellation = qam_tab[(val >> 3) & 0x3];
213 val = cx22700_readreg (state, 0x02);
215 if (((val >> 3) & 0x07) > 4)
216 p->code_rate_HP = FEC_AUTO;
218 p->code_rate_HP = fec_tab[(val >> 3) & 0x07];
220 if ((val & 0x07) > 4)
221 p->code_rate_LP = FEC_AUTO;
223 p->code_rate_LP = fec_tab[val & 0x07];
225 val = cx22700_readreg (state, 0x03);
227 p->guard_interval = GUARD_INTERVAL_1_32 + ((val >> 6) & 0x3);
228 p->transmission_mode = TRANSMISSION_MODE_2K + ((val >> 5) & 0x1);
233 static int cx22700_init (struct dvb_frontend* fe)
235 { struct cx22700_state* state = fe->demodulator_priv;
238 dprintk("cx22700_init: init chip\n");
240 cx22700_writereg (state, 0x00, 0x02); /* soft reset */
241 cx22700_writereg (state, 0x00, 0x00);
245 for (i=0; i<sizeof(init_tab); i+=2)
246 cx22700_writereg (state, init_tab[i], init_tab[i+1]);
248 cx22700_writereg (state, 0x00, 0x01);
250 if (state->config->pll_init) {
251 cx22700_writereg (state, 0x0a, 0x00); /* open i2c bus switch */
252 state->config->pll_init(fe);
253 cx22700_writereg (state, 0x0a, 0x01); /* close i2c bus switch */
259 static int cx22700_read_status(struct dvb_frontend* fe, fe_status_t* status)
261 struct cx22700_state* state = fe->demodulator_priv;
263 u16 rs_ber = (cx22700_readreg (state, 0x0d) << 9)
264 | (cx22700_readreg (state, 0x0e) << 1);
265 u8 sync = cx22700_readreg (state, 0x07);
270 *status |= FE_HAS_SIGNAL;
273 *status |= FE_HAS_CARRIER;
276 *status |= FE_HAS_VITERBI;
279 *status |= FE_HAS_SYNC;
282 *status |= FE_HAS_LOCK;
287 static int cx22700_read_ber(struct dvb_frontend* fe, u32* ber)
289 struct cx22700_state* state = fe->demodulator_priv;
291 *ber = cx22700_readreg (state, 0x0c) & 0x7f;
292 cx22700_writereg (state, 0x0c, 0x00);
297 static int cx22700_read_signal_strength(struct dvb_frontend* fe, u16* signal_strength)
299 struct cx22700_state* state = fe->demodulator_priv;
301 u16 rs_ber = (cx22700_readreg (state, 0x0d) << 9)
302 | (cx22700_readreg (state, 0x0e) << 1);
303 *signal_strength = ~rs_ber;
308 static int cx22700_read_snr(struct dvb_frontend* fe, u16* snr)
310 struct cx22700_state* state = fe->demodulator_priv;
312 u16 rs_ber = (cx22700_readreg (state, 0x0d) << 9)
313 | (cx22700_readreg (state, 0x0e) << 1);
319 static int cx22700_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
321 struct cx22700_state* state = fe->demodulator_priv;
323 *ucblocks = cx22700_readreg (state, 0x0f);
324 cx22700_writereg (state, 0x0f, 0x00);
329 static int cx22700_set_frontend(struct dvb_frontend* fe, struct dvb_frontend_parameters *p)
331 struct cx22700_state* state = fe->demodulator_priv;
333 cx22700_writereg (state, 0x00, 0x02); /* XXX CHECKME: soft reset*/
334 cx22700_writereg (state, 0x00, 0x00);
336 cx22700_writereg (state, 0x0a, 0x00); /* open i2c bus switch */
337 state->config->pll_set(fe, p);
338 cx22700_writereg (state, 0x0a, 0x01); /* close i2c bus switch */
339 cx22700_set_inversion (state, p->inversion);
340 cx22700_set_tps (state, &p->u.ofdm);
341 cx22700_writereg (state, 0x37, 0x01); /* PAL loop filter off */
342 cx22700_writereg (state, 0x00, 0x01); /* restart acquire */
347 static int cx22700_get_frontend(struct dvb_frontend* fe, struct dvb_frontend_parameters *p)
349 struct cx22700_state* state = fe->demodulator_priv;
350 u8 reg09 = cx22700_readreg (state, 0x09);
352 p->inversion = reg09 & 0x1 ? INVERSION_ON : INVERSION_OFF;
353 return cx22700_get_tps (state, &p->u.ofdm);
356 static int cx22700_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings* fesettings)
358 fesettings->min_delay_ms = 150;
359 fesettings->step_size = 166667;
360 fesettings->max_drift = 166667*2;
364 static void cx22700_release(struct dvb_frontend* fe)
366 struct cx22700_state* state = fe->demodulator_priv;
370 static struct dvb_frontend_ops cx22700_ops;
372 struct dvb_frontend* cx22700_attach(const struct cx22700_config* config,
373 struct i2c_adapter* i2c)
375 struct cx22700_state* state = NULL;
377 /* allocate memory for the internal state */
378 state = kmalloc(sizeof(struct cx22700_state), GFP_KERNEL);
379 if (state == NULL) goto error;
381 /* setup the state */
382 state->config = config;
384 memcpy(&state->ops, &cx22700_ops, sizeof(struct dvb_frontend_ops));
386 /* check if the demod is there */
387 if (cx22700_readreg(state, 0x07) < 0) goto error;
389 /* create dvb_frontend */
390 state->frontend.ops = &state->ops;
391 state->frontend.demodulator_priv = state;
392 return &state->frontend;
399 static struct dvb_frontend_ops cx22700_ops = {
402 .name = "Conexant CX22700 DVB-T",
404 .frequency_min = 470000000,
405 .frequency_max = 860000000,
406 .frequency_stepsize = 166667,
407 .caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
408 FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
409 FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_64 |
413 .release = cx22700_release,
415 .init = cx22700_init,
417 .set_frontend = cx22700_set_frontend,
418 .get_frontend = cx22700_get_frontend,
419 .get_tune_settings = cx22700_get_tune_settings,
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,
428 module_param(debug, int, 0644);
429 MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
431 MODULE_DESCRIPTION("Conexant CX22700 DVB-T Demodulator driver");
432 MODULE_AUTHOR("Holger Waechtler");
433 MODULE_LICENSE("GPL");
435 EXPORT_SYMBOL(cx22700_attach);