2 * Support for AltoBeam GB20600 (a.k.a DMB-TH) demodulator
5 * Copyright (C) 2009 David T.L. Wong <davidtlwong@gmail.com>
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.
22 #include <asm/div64.h>
23 #include "dvb_frontend.h"
26 #include "atbm8830_priv.h"
28 #define dprintk(args...) \
31 printk(KERN_DEBUG "atbm8830: " args); \
36 module_param(debug, int, 0644);
37 MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
39 static int atbm8830_write_reg(struct atbm_state *priv, u16 reg, u8 data)
43 u8 buf1[] = { reg >> 8, reg & 0xFF };
45 struct i2c_msg msg1 = { .flags = 0, .buf = buf1, .len = 2 };
46 struct i2c_msg msg2 = { .flags = 0, .buf = buf2, .len = 1 };
48 dev_addr = priv->config->demod_address;
53 printk(KERN_DEBUG "%s: reg=0x%04X, data=0x%02X\n",
56 ret = i2c_transfer(priv->i2c, &msg1, 1);
60 ret = i2c_transfer(priv->i2c, &msg2, 1);
61 return (ret != 1) ? -EIO : 0;
64 static int atbm8830_read_reg(struct atbm_state *priv, u16 reg, u8 *p_data)
69 u8 buf1[] = { reg >> 8, reg & 0xFF };
71 struct i2c_msg msg1 = { .flags = 0, .buf = buf1, .len = 2 };
72 struct i2c_msg msg2 = { .flags = I2C_M_RD, .buf = buf2, .len = 1 };
74 dev_addr = priv->config->demod_address;
78 ret = i2c_transfer(priv->i2c, &msg1, 1);
80 dprintk(KERN_DEBUG "%s: error reg=0x%04x, ret=%i\n",
85 ret = i2c_transfer(priv->i2c, &msg2, 1);
91 printk(KERN_DEBUG "%s: reg=0x%04X, data=0x%02X\n",
92 __func__, reg, buf2[0]);
97 /* Lock register latch so that multi-register read is atomic */
98 static inline int atbm8830_reglatch_lock(struct atbm_state *priv, int lock)
100 return atbm8830_write_reg(priv, REG_READ_LATCH, lock ? 1 : 0);
103 static int set_osc_freq(struct atbm_state *priv, u32 freq /*in kHz*/)
108 /* 0x100000 * freq / 30.4MHz */
109 t = (u64)0x100000 * freq;
113 atbm8830_write_reg(priv, REG_OSC_CLK, val);
114 atbm8830_write_reg(priv, REG_OSC_CLK + 1, val >> 8);
115 atbm8830_write_reg(priv, REG_OSC_CLK + 2, val >> 16);
120 static int set_if_freq(struct atbm_state *priv, u32 freq /*in kHz*/)
123 u32 fs = priv->config->osc_clk_freq;
129 /* 2 * PI * (freq - fs) / fs * (2 ^ 22) */
130 t = (u64) 2 * 31416 * (freq - fs);
136 atbm8830_write_reg(priv, REG_TUNER_BASEBAND, 1);
137 atbm8830_write_reg(priv, REG_IF_FREQ, val);
138 atbm8830_write_reg(priv, REG_IF_FREQ+1, val >> 8);
139 atbm8830_write_reg(priv, REG_IF_FREQ+2, val >> 16);
141 atbm8830_read_reg(priv, REG_ADC_CONFIG, &dat);
143 atbm8830_write_reg(priv, REG_ADC_CONFIG, dat);
146 atbm8830_write_reg(priv, REG_TUNER_BASEBAND, 0);
148 atbm8830_read_reg(priv, REG_ADC_CONFIG, &dat);
151 atbm8830_write_reg(priv, REG_ADC_CONFIG, dat);
153 if (priv->config->zif_swap_iq)
154 atbm8830_write_reg(priv, REG_SWAP_I_Q, 0x03);
156 atbm8830_write_reg(priv, REG_SWAP_I_Q, 0x01);
162 static int is_locked(struct atbm_state *priv, u8 *locked)
166 atbm8830_read_reg(priv, REG_LOCK_STATUS, &status);
169 *locked = (status == 1);
174 static int set_static_channel_mode(struct atbm_state *priv)
178 for (i = 0; i < 5; i++)
179 atbm8830_write_reg(priv, 0x099B + i, 0x08);
181 atbm8830_write_reg(priv, 0x095B, 0x7F);
182 atbm8830_write_reg(priv, 0x09CB, 0x01);
183 atbm8830_write_reg(priv, 0x09CC, 0x7F);
184 atbm8830_write_reg(priv, 0x09CD, 0x7F);
185 atbm8830_write_reg(priv, 0x0E01, 0x20);
187 /* For single carrier */
188 atbm8830_write_reg(priv, 0x0B03, 0x0A);
189 atbm8830_write_reg(priv, 0x0935, 0x10);
190 atbm8830_write_reg(priv, 0x0936, 0x08);
191 atbm8830_write_reg(priv, 0x093E, 0x08);
192 atbm8830_write_reg(priv, 0x096E, 0x06);
194 /* frame_count_max0 */
195 atbm8830_write_reg(priv, 0x0B09, 0x00);
196 /* frame_count_max1 */
197 atbm8830_write_reg(priv, 0x0B0A, 0x08);
202 static int set_ts_config(struct atbm_state *priv)
204 const struct atbm8830_config *cfg = priv->config;
206 /*Set parallel/serial ts mode*/
207 atbm8830_write_reg(priv, REG_TS_SERIAL, cfg->serial_ts ? 1 : 0);
208 atbm8830_write_reg(priv, REG_TS_CLK_MODE, cfg->serial_ts ? 1 : 0);
209 /*Set ts sampling edge*/
210 atbm8830_write_reg(priv, REG_TS_SAMPLE_EDGE,
211 cfg->ts_sampling_edge ? 1 : 0);
212 /*Set ts clock freerun*/
213 atbm8830_write_reg(priv, REG_TS_CLK_FREERUN,
214 cfg->ts_clk_gated ? 0 : 1);
219 static int atbm8830_init(struct dvb_frontend *fe)
221 struct atbm_state *priv = fe->demodulator_priv;
222 const struct atbm8830_config *cfg = priv->config;
224 /*Set oscillator frequency*/
225 set_osc_freq(priv, cfg->osc_clk_freq);
228 set_if_freq(priv, cfg->if_freq);
231 /*Set static channel mode*/
232 set_static_channel_mode(priv);
235 /*Turn off DSP reset*/
236 atbm8830_write_reg(priv, 0x000A, 0);
239 atbm8830_write_reg(priv, 0x020C, 11);
242 atbm8830_write_reg(priv, REG_DEMOD_RUN, 1);
248 static void atbm8830_release(struct dvb_frontend *fe)
250 struct atbm_state *state = fe->demodulator_priv;
251 dprintk("%s\n", __func__);
256 static int atbm8830_set_fe(struct dvb_frontend *fe,
257 struct dvb_frontend_parameters *fe_params)
259 struct atbm_state *priv = fe->demodulator_priv;
262 dprintk("%s\n", __func__);
265 if (fe->ops.tuner_ops.set_params) {
266 if (fe->ops.i2c_gate_ctrl)
267 fe->ops.i2c_gate_ctrl(fe, 1);
268 fe->ops.tuner_ops.set_params(fe, fe_params);
269 if (fe->ops.i2c_gate_ctrl)
270 fe->ops.i2c_gate_ctrl(fe, 0);
273 /* start auto lock */
274 for (i = 0; i < 10; i++) {
276 dprintk("Try %d\n", i);
277 is_locked(priv, &locked);
279 dprintk("ATBM8830 locked!\n");
287 static int atbm8830_get_fe(struct dvb_frontend *fe,
288 struct dvb_frontend_parameters *fe_params)
290 dprintk("%s\n", __func__);
292 /* TODO: get real readings from device */
293 /* inversion status */
294 fe_params->inversion = INVERSION_OFF;
297 fe_params->u.ofdm.bandwidth = BANDWIDTH_8_MHZ;
299 fe_params->u.ofdm.code_rate_HP = FEC_AUTO;
300 fe_params->u.ofdm.code_rate_LP = FEC_AUTO;
302 fe_params->u.ofdm.constellation = QAM_AUTO;
304 /* transmission mode */
305 fe_params->u.ofdm.transmission_mode = TRANSMISSION_MODE_AUTO;
308 fe_params->u.ofdm.guard_interval = GUARD_INTERVAL_AUTO;
311 fe_params->u.ofdm.hierarchy_information = HIERARCHY_NONE;
316 static int atbm8830_get_tune_settings(struct dvb_frontend *fe,
317 struct dvb_frontend_tune_settings *fesettings)
319 fesettings->min_delay_ms = 0;
320 fesettings->step_size = 0;
321 fesettings->max_drift = 0;
325 static int atbm8830_read_status(struct dvb_frontend *fe, fe_status_t *fe_status)
327 struct atbm_state *priv = fe->demodulator_priv;
331 dprintk("%s\n", __func__);
334 is_locked(priv, &locked);
336 *fe_status |= FE_HAS_SIGNAL | FE_HAS_CARRIER |
337 FE_HAS_VITERBI | FE_HAS_SYNC | FE_HAS_LOCK;
339 dprintk("%s: fe_status=0x%x\n", __func__, *fe_status);
341 atbm8830_read_reg(priv, REG_AGC_LOCK, &agc_locked);
342 dprintk("AGC Lock: %d\n", agc_locked);
347 static int atbm8830_read_ber(struct dvb_frontend *fe, u32 *ber)
349 struct atbm_state *priv = fe->demodulator_priv;
353 dprintk("%s\n", __func__);
355 atbm8830_reglatch_lock(priv, 1);
357 atbm8830_read_reg(priv, REG_FRAME_ERR_CNT + 1, &t);
358 frame_err = t & 0x7F;
360 atbm8830_read_reg(priv, REG_FRAME_ERR_CNT, &t);
363 atbm8830_reglatch_lock(priv, 0);
365 *ber = frame_err * 100 / 32767;
367 dprintk("%s: ber=0x%x\n", __func__, *ber);
371 static int atbm8830_read_signal_strength(struct dvb_frontend *fe, u16 *signal)
373 struct atbm_state *priv = fe->demodulator_priv;
377 dprintk("%s\n", __func__);
378 atbm8830_reglatch_lock(priv, 1);
380 atbm8830_read_reg(priv, REG_AGC_PWM_VAL + 1, &t);
383 atbm8830_read_reg(priv, REG_AGC_PWM_VAL, &t);
386 atbm8830_reglatch_lock(priv, 0);
388 dprintk("AGC PWM = 0x%02X\n", pwm);
391 *signal = pwm * 0x10000 / 0x400;
396 static int atbm8830_read_snr(struct dvb_frontend *fe, u16 *snr)
398 dprintk("%s\n", __func__);
403 static int atbm8830_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
405 dprintk("%s\n", __func__);
410 static int atbm8830_i2c_gate_ctrl(struct dvb_frontend *fe, int enable)
412 struct atbm_state *priv = fe->demodulator_priv;
414 return atbm8830_write_reg(priv, REG_I2C_GATE, enable ? 1 : 0);
417 static struct dvb_frontend_ops atbm8830_ops = {
419 .name = "AltoBeam ATBM8830/8831 DMB-TH",
421 .frequency_min = 474000000,
422 .frequency_max = 858000000,
423 .frequency_stepsize = 10000,
427 FE_CAN_TRANSMISSION_MODE_AUTO |
428 FE_CAN_GUARD_INTERVAL_AUTO
431 .release = atbm8830_release,
433 .init = atbm8830_init,
436 .i2c_gate_ctrl = atbm8830_i2c_gate_ctrl,
438 .set_frontend = atbm8830_set_fe,
439 .get_frontend = atbm8830_get_fe,
440 .get_tune_settings = atbm8830_get_tune_settings,
442 .read_status = atbm8830_read_status,
443 .read_ber = atbm8830_read_ber,
444 .read_signal_strength = atbm8830_read_signal_strength,
445 .read_snr = atbm8830_read_snr,
446 .read_ucblocks = atbm8830_read_ucblocks,
449 struct dvb_frontend *atbm8830_attach(const struct atbm8830_config *config,
450 struct i2c_adapter *i2c)
452 struct atbm_state *priv = NULL;
455 dprintk("%s()\n", __func__);
457 if (config == NULL || i2c == NULL)
460 priv = kzalloc(sizeof(struct atbm_state), GFP_KERNEL);
464 priv->config = config;
467 /* check if the demod is there */
468 if (atbm8830_read_reg(priv, REG_CHIP_ID, &data) != 0) {
469 dprintk("%s atbm8830/8831 not found at i2c addr 0x%02X\n",
470 __func__, priv->config->demod_address);
473 dprintk("atbm8830 chip id: 0x%02X\n", data);
475 memcpy(&priv->frontend.ops, &atbm8830_ops,
476 sizeof(struct dvb_frontend_ops));
477 priv->frontend.demodulator_priv = priv;
479 atbm8830_init(&priv->frontend);
481 atbm8830_i2c_gate_ctrl(&priv->frontend, 1);
483 return &priv->frontend;
486 dprintk("%s() error_out\n", __func__);
491 EXPORT_SYMBOL(atbm8830_attach);
493 MODULE_DESCRIPTION("AltoBeam ATBM8830/8831 GB20600 demodulator driver");
494 MODULE_AUTHOR("David T. L. Wong <davidtlwong@gmail.com>");
495 MODULE_LICENSE("GPL");