2 VES1820 - Single Chip Cable Channel Receiver driver module
4 Copyright (C) 1999 Convergence Integrated Media GmbH <ralph@convergence.de>
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 #include <linux/config.h>
22 #include <linux/delay.h>
23 #include <linux/errno.h>
24 #include <linux/init.h>
25 #include <linux/kernel.h>
26 #include <linux/module.h>
27 #include <linux/string.h>
28 #include <linux/slab.h>
29 #include <asm/div64.h>
31 #include "dvb_frontend.h"
36 struct ves1820_state {
37 struct i2c_adapter* i2c;
38 /* configuration settings */
39 const struct ves1820_config* config;
40 struct dvb_frontend frontend;
42 /* private demodulator data */
50 static u8 ves1820_inittab[] = {
51 0x69, 0x6A, 0x93, 0x12, 0x12, 0x46, 0x26, 0x1A,
52 0x43, 0x6A, 0xAA, 0xAA, 0x1E, 0x85, 0x43, 0x20,
53 0xE0, 0x00, 0xA1, 0x00, 0x00, 0x00, 0x00, 0x00,
54 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00,
55 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
56 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
57 0x00, 0x00, 0x00, 0x00, 0x40
60 static int ves1820_writereg(struct ves1820_state *state, u8 reg, u8 data)
62 u8 buf[] = { 0x00, reg, data };
63 struct i2c_msg msg = {.addr = state->config->demod_address,.flags = 0,.buf = buf,.len = 3 };
66 ret = i2c_transfer(state->i2c, &msg, 1);
69 printk("ves1820: %s(): writereg error (reg == 0x%02x,"
70 "val == 0x%02x, ret == %i)\n", __FUNCTION__, reg, data, ret);
72 return (ret != 1) ? -EREMOTEIO : 0;
75 static u8 ves1820_readreg(struct ves1820_state *state, u8 reg)
77 u8 b0[] = { 0x00, reg };
79 struct i2c_msg msg[] = {
80 {.addr = state->config->demod_address,.flags = 0,.buf = b0,.len = 2},
81 {.addr = state->config->demod_address,.flags = I2C_M_RD,.buf = b1,.len = 1}
85 ret = i2c_transfer(state->i2c, msg, 2);
88 printk("ves1820: %s(): readreg error (reg == 0x%02x,"
89 "ret == %i)\n", __FUNCTION__, reg, ret);
94 static int ves1820_setup_reg0(struct ves1820_state *state, u8 reg0, fe_spectral_inversion_t inversion)
96 reg0 |= state->reg0 & 0x62;
98 if (INVERSION_ON == inversion) {
99 if (!state->config->invert) reg0 |= 0x20;
101 } else if (INVERSION_OFF == inversion) {
102 if (!state->config->invert) reg0 &= ~0x20;
106 ves1820_writereg(state, 0x00, reg0 & 0xfe);
107 ves1820_writereg(state, 0x00, reg0 | 0x01);
114 static int ves1820_set_symbolrate(struct ves1820_state *state, u32 symbolrate)
126 if (symbolrate > state->config->xin / 2)
127 symbolrate = state->config->xin / 2;
129 if (symbolrate < 500000)
132 if (symbolrate < state->config->xin / 16)
134 if (symbolrate < state->config->xin / 32)
136 if (symbolrate < state->config->xin / 64)
140 fpxin = state->config->xin * 10;
141 fptmp = fpxin; do_div(fptmp, 123);
142 if (symbolrate < fptmp)
144 fptmp = fpxin; do_div(fptmp, 160);
145 if (symbolrate < fptmp)
147 fptmp = fpxin; do_div(fptmp, 246);
148 if (symbolrate < fptmp)
150 fptmp = fpxin; do_div(fptmp, 320);
151 if (symbolrate < fptmp)
153 fptmp = fpxin; do_div(fptmp, 492);
154 if (symbolrate < fptmp)
156 fptmp = fpxin; do_div(fptmp, 640);
157 if (symbolrate < fptmp)
159 fptmp = fpxin; do_div(fptmp, 984);
160 if (symbolrate < fptmp)
163 fin = state->config->xin >> 4;
165 ratio = (symbolrate << 4) / fin;
166 tmp = ((symbolrate << 4) % fin) << 8;
167 ratio = (ratio << 8) + tmp / fin;
168 tmp = (tmp % fin) << 8;
169 ratio = (ratio << 8) + (tmp + fin / 2) / fin;
172 BDRI = (((state->config->xin << 5) / symbolrate) + 1) / 2;
177 SFIL = (SFIL << 4) | ves1820_inittab[0x0E];
179 NDEC = (NDEC << 6) | ves1820_inittab[0x03];
181 ves1820_writereg(state, 0x03, NDEC);
182 ves1820_writereg(state, 0x0a, BDR & 0xff);
183 ves1820_writereg(state, 0x0b, (BDR >> 8) & 0xff);
184 ves1820_writereg(state, 0x0c, (BDR >> 16) & 0x3f);
186 ves1820_writereg(state, 0x0d, BDRI);
187 ves1820_writereg(state, 0x0e, SFIL);
192 static int ves1820_init(struct dvb_frontend* fe)
194 struct ves1820_state* state = fe->demodulator_priv;
197 ves1820_writereg(state, 0, 0);
199 for (i = 0; i < sizeof(ves1820_inittab); i++)
200 ves1820_writereg(state, i, ves1820_inittab[i]);
201 if (state->config->selagc)
202 ves1820_writereg(state, 2, ves1820_inittab[2] | 0x08);
204 ves1820_writereg(state, 0x34, state->pwm);
209 static int ves1820_set_parameters(struct dvb_frontend* fe, struct dvb_frontend_parameters *p)
211 struct ves1820_state* state = fe->demodulator_priv;
212 static const u8 reg0x00[] = { 0x00, 0x04, 0x08, 0x0c, 0x10 };
213 static const u8 reg0x01[] = { 140, 140, 106, 100, 92 };
214 static const u8 reg0x05[] = { 135, 100, 70, 54, 38 };
215 static const u8 reg0x08[] = { 162, 116, 67, 52, 35 };
216 static const u8 reg0x09[] = { 145, 150, 106, 126, 107 };
217 int real_qam = p->u.qam.modulation - QAM_16;
219 if (real_qam < 0 || real_qam > 4)
222 if (fe->ops.tuner_ops.set_params) {
223 fe->ops.tuner_ops.set_params(fe, p);
224 if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0);
227 ves1820_set_symbolrate(state, p->u.qam.symbol_rate);
228 ves1820_writereg(state, 0x34, state->pwm);
230 ves1820_writereg(state, 0x01, reg0x01[real_qam]);
231 ves1820_writereg(state, 0x05, reg0x05[real_qam]);
232 ves1820_writereg(state, 0x08, reg0x08[real_qam]);
233 ves1820_writereg(state, 0x09, reg0x09[real_qam]);
235 ves1820_setup_reg0(state, reg0x00[real_qam], p->inversion);
236 ves1820_writereg(state, 2, ves1820_inittab[2] | (state->config->selagc ? 0x08 : 0));
240 static int ves1820_read_status(struct dvb_frontend* fe, fe_status_t* status)
242 struct ves1820_state* state = fe->demodulator_priv;
246 sync = ves1820_readreg(state, 0x11);
249 *status |= FE_HAS_SIGNAL;
252 *status |= FE_HAS_CARRIER;
254 if (sync & 2) /* XXX FIXME! */
255 *status |= FE_HAS_VITERBI;
258 *status |= FE_HAS_SYNC;
261 *status |= FE_HAS_LOCK;
266 static int ves1820_read_ber(struct dvb_frontend* fe, u32* ber)
268 struct ves1820_state* state = fe->demodulator_priv;
270 u32 _ber = ves1820_readreg(state, 0x14) |
271 (ves1820_readreg(state, 0x15) << 8) |
272 ((ves1820_readreg(state, 0x16) & 0x0f) << 16);
278 static int ves1820_read_signal_strength(struct dvb_frontend* fe, u16* strength)
280 struct ves1820_state* state = fe->demodulator_priv;
282 u8 gain = ves1820_readreg(state, 0x17);
283 *strength = (gain << 8) | gain;
288 static int ves1820_read_snr(struct dvb_frontend* fe, u16* snr)
290 struct ves1820_state* state = fe->demodulator_priv;
292 u8 quality = ~ves1820_readreg(state, 0x18);
293 *snr = (quality << 8) | quality;
298 static int ves1820_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
300 struct ves1820_state* state = fe->demodulator_priv;
302 *ucblocks = ves1820_readreg(state, 0x13) & 0x7f;
303 if (*ucblocks == 0x7f)
304 *ucblocks = 0xffffffff;
306 /* reset uncorrected block counter */
307 ves1820_writereg(state, 0x10, ves1820_inittab[0x10] & 0xdf);
308 ves1820_writereg(state, 0x10, ves1820_inittab[0x10]);
313 static int ves1820_get_frontend(struct dvb_frontend* fe, struct dvb_frontend_parameters *p)
315 struct ves1820_state* state = fe->demodulator_priv;
319 sync = ves1820_readreg(state, 0x11);
320 afc = ves1820_readreg(state, 0x19);
322 /* AFC only valid when carrier has been recovered */
323 printk(sync & 2 ? "ves1820: AFC (%d) %dHz\n" :
324 "ves1820: [AFC (%d) %dHz]\n", afc, -((s32) p->u.qam.symbol_rate * afc) >> 10);
327 if (!state->config->invert) {
328 p->inversion = (state->reg0 & 0x20) ? INVERSION_ON : INVERSION_OFF;
330 p->inversion = (!(state->reg0 & 0x20)) ? INVERSION_ON : INVERSION_OFF;
333 p->u.qam.modulation = ((state->reg0 >> 2) & 7) + QAM_16;
335 p->u.qam.fec_inner = FEC_NONE;
337 p->frequency = ((p->frequency + 31250) / 62500) * 62500;
339 p->frequency -= ((s32) p->u.qam.symbol_rate * afc) >> 10;
344 static int ves1820_sleep(struct dvb_frontend* fe)
346 struct ves1820_state* state = fe->demodulator_priv;
348 ves1820_writereg(state, 0x1b, 0x02); /* pdown ADC */
349 ves1820_writereg(state, 0x00, 0x80); /* standby */
354 static int ves1820_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings* fesettings)
357 fesettings->min_delay_ms = 200;
358 fesettings->step_size = 0;
359 fesettings->max_drift = 0;
363 static void ves1820_release(struct dvb_frontend* fe)
365 struct ves1820_state* state = fe->demodulator_priv;
369 static struct dvb_frontend_ops ves1820_ops;
371 struct dvb_frontend* ves1820_attach(const struct ves1820_config* config,
372 struct i2c_adapter* i2c,
375 struct ves1820_state* state = NULL;
377 /* allocate memory for the internal state */
378 state = kmalloc(sizeof(struct ves1820_state), GFP_KERNEL);
382 /* setup the state */
383 state->reg0 = ves1820_inittab[0];
384 state->config = config;
388 /* check if the demod is there */
389 if ((ves1820_readreg(state, 0x1a) & 0xf0) != 0x70)
393 printk("ves1820: pwm=0x%02x\n", state->pwm);
395 /* create dvb_frontend */
396 memcpy(&state->frontend.ops, &ves1820_ops, sizeof(struct dvb_frontend_ops));
397 state->frontend.ops.info.symbol_rate_min = (state->config->xin / 2) / 64; /* SACLK/64 == (XIN/2)/64 */
398 state->frontend.ops.info.symbol_rate_max = (state->config->xin / 2) / 4; /* SACLK/4 */
399 state->frontend.demodulator_priv = state;
401 return &state->frontend;
408 static struct dvb_frontend_ops ves1820_ops = {
411 .name = "VLSI VES1820 DVB-C",
413 .frequency_stepsize = 62500,
414 .frequency_min = 51000000,
415 .frequency_max = 858000000,
416 .caps = FE_CAN_QAM_16 |
424 .release = ves1820_release,
426 .init = ves1820_init,
427 .sleep = ves1820_sleep,
429 .set_frontend = ves1820_set_parameters,
430 .get_frontend = ves1820_get_frontend,
431 .get_tune_settings = ves1820_get_tune_settings,
433 .read_status = ves1820_read_status,
434 .read_ber = ves1820_read_ber,
435 .read_signal_strength = ves1820_read_signal_strength,
436 .read_snr = ves1820_read_snr,
437 .read_ucblocks = ves1820_read_ucblocks,
440 module_param(verbose, int, 0644);
441 MODULE_PARM_DESC(verbose, "print AFC offset after tuning for debugging the PWM setting");
443 MODULE_DESCRIPTION("VLSI VES1820 DVB-C Demodulator driver");
444 MODULE_AUTHOR("Ralph Metzler, Holger Waechtler");
445 MODULE_LICENSE("GPL");
447 EXPORT_SYMBOL(ves1820_attach);