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ec27b6aa DW |
1 | /* |
2 | * Support for AltoBeam GB20600 (a.k.a DMB-TH) demodulator | |
3 | * ATBM8830, ATBM8831 | |
4 | * | |
5 | * Copyright (C) 2009 David T.L. Wong <davidtlwong@gmail.com> | |
6 | * | |
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. | |
11 | * | |
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. | |
16 | * | |
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. | |
20 | */ | |
21 | ||
92fda216 | 22 | #include <asm/div64.h> |
ec27b6aa DW |
23 | #include "dvb_frontend.h" |
24 | ||
25 | #include "atbm8830.h" | |
26 | #include "atbm8830_priv.h" | |
27 | ||
28 | #define dprintk(args...) \ | |
29 | do { \ | |
30 | if (debug) \ | |
31 | printk(KERN_DEBUG "atbm8830: " args); \ | |
32 | } while (0) | |
33 | ||
34 | static int debug; | |
35 | ||
36 | module_param(debug, int, 0644); | |
37 | MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off)."); | |
38 | ||
39 | static int atbm8830_write_reg(struct atbm_state *priv, u16 reg, u8 data) | |
40 | { | |
41 | int ret = 0; | |
42 | u8 dev_addr; | |
43 | u8 buf1[] = { reg >> 8, reg & 0xFF }; | |
44 | u8 buf2[] = { data }; | |
45 | struct i2c_msg msg1 = { .flags = 0, .buf = buf1, .len = 2 }; | |
46 | struct i2c_msg msg2 = { .flags = 0, .buf = buf2, .len = 1 }; | |
47 | ||
48 | dev_addr = priv->config->demod_address; | |
49 | msg1.addr = dev_addr; | |
50 | msg2.addr = dev_addr; | |
51 | ||
52 | if (debug >= 2) | |
53 | printk(KERN_DEBUG "%s: reg=0x%04X, data=0x%02X\n", | |
54 | __func__, reg, data); | |
55 | ||
56 | ret = i2c_transfer(priv->i2c, &msg1, 1); | |
57 | if (ret != 1) | |
58 | return -EIO; | |
59 | ||
60 | ret = i2c_transfer(priv->i2c, &msg2, 1); | |
61 | return (ret != 1) ? -EIO : 0; | |
62 | } | |
63 | ||
64 | static int atbm8830_read_reg(struct atbm_state *priv, u16 reg, u8 *p_data) | |
65 | { | |
66 | int ret; | |
67 | u8 dev_addr; | |
68 | ||
69 | u8 buf1[] = { reg >> 8, reg & 0xFF }; | |
70 | u8 buf2[] = { 0 }; | |
71 | struct i2c_msg msg1 = { .flags = 0, .buf = buf1, .len = 2 }; | |
72 | struct i2c_msg msg2 = { .flags = I2C_M_RD, .buf = buf2, .len = 1 }; | |
73 | ||
74 | dev_addr = priv->config->demod_address; | |
75 | msg1.addr = dev_addr; | |
76 | msg2.addr = dev_addr; | |
77 | ||
78 | ret = i2c_transfer(priv->i2c, &msg1, 1); | |
79 | if (ret != 1) { | |
80 | dprintk(KERN_DEBUG "%s: error reg=0x%04x, ret=%i\n", | |
81 | __func__, reg, ret); | |
82 | return -EIO; | |
83 | } | |
84 | ||
85 | ret = i2c_transfer(priv->i2c, &msg2, 1); | |
86 | if (ret != 1) | |
87 | return -EIO; | |
88 | ||
89 | *p_data = buf2[0]; | |
90 | if (debug >= 2) | |
91 | printk(KERN_DEBUG "%s: reg=0x%04X, data=0x%02X\n", | |
92 | __func__, reg, buf2[0]); | |
93 | ||
94 | return 0; | |
95 | } | |
96 | ||
97 | /* Lock register latch so that multi-register read is atomic */ | |
98 | static inline int atbm8830_reglatch_lock(struct atbm_state *priv, int lock) | |
99 | { | |
100 | return atbm8830_write_reg(priv, REG_READ_LATCH, lock ? 1 : 0); | |
101 | } | |
102 | ||
103 | static int set_osc_freq(struct atbm_state *priv, u32 freq /*in kHz*/) | |
104 | { | |
105 | u32 val; | |
92fda216 | 106 | u64 t; |
ec27b6aa | 107 | |
92fda216 DW |
108 | /* 0x100000 * freq / 30.4MHz */ |
109 | t = (u64)0x100000 * freq; | |
110 | do_div(t, 30400); | |
111 | val = t; | |
ec27b6aa DW |
112 | |
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); | |
116 | ||
117 | return 0; | |
118 | } | |
119 | ||
120 | static int set_if_freq(struct atbm_state *priv, u32 freq /*in kHz*/) | |
121 | { | |
b8415f53 | 122 | |
ec27b6aa | 123 | u32 fs = priv->config->osc_clk_freq; |
92fda216 | 124 | u64 t; |
ec27b6aa DW |
125 | u32 val; |
126 | u8 dat; | |
127 | ||
ec27b6aa | 128 | if (freq != 0) { |
92fda216 DW |
129 | /* 2 * PI * (freq - fs) / fs * (2 ^ 22) */ |
130 | t = (u64) 2 * 31416 * (freq - fs); | |
131 | t <<= 22; | |
132 | do_div(t, fs); | |
133 | do_div(t, 1000); | |
134 | val = t; | |
135 | ||
ec27b6aa DW |
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); | |
140 | ||
141 | atbm8830_read_reg(priv, REG_ADC_CONFIG, &dat); | |
142 | dat &= 0xFC; | |
143 | atbm8830_write_reg(priv, REG_ADC_CONFIG, dat); | |
144 | } else { | |
145 | /* Zero IF */ | |
146 | atbm8830_write_reg(priv, REG_TUNER_BASEBAND, 0); | |
147 | ||
148 | atbm8830_read_reg(priv, REG_ADC_CONFIG, &dat); | |
149 | dat &= 0xFC; | |
150 | dat |= 0x02; | |
151 | atbm8830_write_reg(priv, REG_ADC_CONFIG, dat); | |
152 | ||
153 | if (priv->config->zif_swap_iq) | |
154 | atbm8830_write_reg(priv, REG_SWAP_I_Q, 0x03); | |
155 | else | |
156 | atbm8830_write_reg(priv, REG_SWAP_I_Q, 0x01); | |
157 | } | |
158 | ||
159 | return 0; | |
160 | } | |
161 | ||
162 | static int is_locked(struct atbm_state *priv, u8 *locked) | |
163 | { | |
164 | u8 status; | |
165 | ||
166 | atbm8830_read_reg(priv, REG_LOCK_STATUS, &status); | |
167 | ||
168 | if (locked != NULL) | |
169 | *locked = (status == 1); | |
170 | return 0; | |
171 | } | |
172 | ||
c245c75c DW |
173 | static int set_agc_config(struct atbm_state *priv, |
174 | u8 min, u8 max, u8 hold_loop) | |
175 | { | |
176 | /* no effect if both min and max are zero */ | |
177 | if (!min && !max) | |
178 | return 0; | |
179 | ||
180 | atbm8830_write_reg(priv, REG_AGC_MIN, min); | |
181 | atbm8830_write_reg(priv, REG_AGC_MAX, max); | |
182 | atbm8830_write_reg(priv, REG_AGC_HOLD_LOOP, hold_loop); | |
183 | ||
184 | return 0; | |
185 | } | |
ec27b6aa DW |
186 | |
187 | static int set_static_channel_mode(struct atbm_state *priv) | |
188 | { | |
189 | int i; | |
190 | ||
191 | for (i = 0; i < 5; i++) | |
192 | atbm8830_write_reg(priv, 0x099B + i, 0x08); | |
193 | ||
194 | atbm8830_write_reg(priv, 0x095B, 0x7F); | |
195 | atbm8830_write_reg(priv, 0x09CB, 0x01); | |
196 | atbm8830_write_reg(priv, 0x09CC, 0x7F); | |
197 | atbm8830_write_reg(priv, 0x09CD, 0x7F); | |
198 | atbm8830_write_reg(priv, 0x0E01, 0x20); | |
199 | ||
200 | /* For single carrier */ | |
201 | atbm8830_write_reg(priv, 0x0B03, 0x0A); | |
202 | atbm8830_write_reg(priv, 0x0935, 0x10); | |
203 | atbm8830_write_reg(priv, 0x0936, 0x08); | |
204 | atbm8830_write_reg(priv, 0x093E, 0x08); | |
205 | atbm8830_write_reg(priv, 0x096E, 0x06); | |
206 | ||
207 | /* frame_count_max0 */ | |
208 | atbm8830_write_reg(priv, 0x0B09, 0x00); | |
209 | /* frame_count_max1 */ | |
210 | atbm8830_write_reg(priv, 0x0B0A, 0x08); | |
211 | ||
212 | return 0; | |
213 | } | |
214 | ||
215 | static int set_ts_config(struct atbm_state *priv) | |
216 | { | |
217 | const struct atbm8830_config *cfg = priv->config; | |
218 | ||
219 | /*Set parallel/serial ts mode*/ | |
220 | atbm8830_write_reg(priv, REG_TS_SERIAL, cfg->serial_ts ? 1 : 0); | |
221 | atbm8830_write_reg(priv, REG_TS_CLK_MODE, cfg->serial_ts ? 1 : 0); | |
222 | /*Set ts sampling edge*/ | |
223 | atbm8830_write_reg(priv, REG_TS_SAMPLE_EDGE, | |
224 | cfg->ts_sampling_edge ? 1 : 0); | |
225 | /*Set ts clock freerun*/ | |
226 | atbm8830_write_reg(priv, REG_TS_CLK_FREERUN, | |
227 | cfg->ts_clk_gated ? 0 : 1); | |
228 | ||
229 | return 0; | |
230 | } | |
231 | ||
232 | static int atbm8830_init(struct dvb_frontend *fe) | |
233 | { | |
234 | struct atbm_state *priv = fe->demodulator_priv; | |
235 | const struct atbm8830_config *cfg = priv->config; | |
236 | ||
237 | /*Set oscillator frequency*/ | |
238 | set_osc_freq(priv, cfg->osc_clk_freq); | |
239 | ||
240 | /*Set IF frequency*/ | |
241 | set_if_freq(priv, cfg->if_freq); | |
242 | ||
c245c75c DW |
243 | /*Set AGC Config*/ |
244 | set_agc_config(priv, cfg->agc_min, cfg->agc_max, | |
245 | cfg->agc_hold_loop); | |
ec27b6aa DW |
246 | |
247 | /*Set static channel mode*/ | |
248 | set_static_channel_mode(priv); | |
249 | ||
250 | set_ts_config(priv); | |
251 | /*Turn off DSP reset*/ | |
252 | atbm8830_write_reg(priv, 0x000A, 0); | |
253 | ||
254 | /*SW version test*/ | |
255 | atbm8830_write_reg(priv, 0x020C, 11); | |
256 | ||
257 | /* Run */ | |
258 | atbm8830_write_reg(priv, REG_DEMOD_RUN, 1); | |
259 | ||
260 | return 0; | |
261 | } | |
262 | ||
263 | ||
264 | static void atbm8830_release(struct dvb_frontend *fe) | |
265 | { | |
266 | struct atbm_state *state = fe->demodulator_priv; | |
267 | dprintk("%s\n", __func__); | |
268 | ||
269 | kfree(state); | |
270 | } | |
271 | ||
272 | static int atbm8830_set_fe(struct dvb_frontend *fe, | |
273 | struct dvb_frontend_parameters *fe_params) | |
274 | { | |
275 | struct atbm_state *priv = fe->demodulator_priv; | |
276 | int i; | |
277 | u8 locked = 0; | |
278 | dprintk("%s\n", __func__); | |
279 | ||
280 | /* set frequency */ | |
281 | if (fe->ops.tuner_ops.set_params) { | |
282 | if (fe->ops.i2c_gate_ctrl) | |
283 | fe->ops.i2c_gate_ctrl(fe, 1); | |
284 | fe->ops.tuner_ops.set_params(fe, fe_params); | |
285 | if (fe->ops.i2c_gate_ctrl) | |
286 | fe->ops.i2c_gate_ctrl(fe, 0); | |
287 | } | |
288 | ||
289 | /* start auto lock */ | |
290 | for (i = 0; i < 10; i++) { | |
291 | mdelay(100); | |
292 | dprintk("Try %d\n", i); | |
293 | is_locked(priv, &locked); | |
294 | if (locked != 0) { | |
295 | dprintk("ATBM8830 locked!\n"); | |
296 | break; | |
297 | } | |
298 | } | |
299 | ||
300 | return 0; | |
301 | } | |
302 | ||
303 | static int atbm8830_get_fe(struct dvb_frontend *fe, | |
304 | struct dvb_frontend_parameters *fe_params) | |
305 | { | |
306 | dprintk("%s\n", __func__); | |
307 | ||
308 | /* TODO: get real readings from device */ | |
309 | /* inversion status */ | |
310 | fe_params->inversion = INVERSION_OFF; | |
311 | ||
312 | /* bandwidth */ | |
313 | fe_params->u.ofdm.bandwidth = BANDWIDTH_8_MHZ; | |
314 | ||
315 | fe_params->u.ofdm.code_rate_HP = FEC_AUTO; | |
316 | fe_params->u.ofdm.code_rate_LP = FEC_AUTO; | |
317 | ||
318 | fe_params->u.ofdm.constellation = QAM_AUTO; | |
319 | ||
320 | /* transmission mode */ | |
321 | fe_params->u.ofdm.transmission_mode = TRANSMISSION_MODE_AUTO; | |
322 | ||
323 | /* guard interval */ | |
324 | fe_params->u.ofdm.guard_interval = GUARD_INTERVAL_AUTO; | |
325 | ||
326 | /* hierarchy */ | |
327 | fe_params->u.ofdm.hierarchy_information = HIERARCHY_NONE; | |
328 | ||
329 | return 0; | |
330 | } | |
331 | ||
332 | static int atbm8830_get_tune_settings(struct dvb_frontend *fe, | |
333 | struct dvb_frontend_tune_settings *fesettings) | |
334 | { | |
335 | fesettings->min_delay_ms = 0; | |
336 | fesettings->step_size = 0; | |
337 | fesettings->max_drift = 0; | |
338 | return 0; | |
339 | } | |
340 | ||
341 | static int atbm8830_read_status(struct dvb_frontend *fe, fe_status_t *fe_status) | |
342 | { | |
343 | struct atbm_state *priv = fe->demodulator_priv; | |
344 | u8 locked = 0; | |
345 | u8 agc_locked = 0; | |
346 | ||
347 | dprintk("%s\n", __func__); | |
348 | *fe_status = 0; | |
349 | ||
350 | is_locked(priv, &locked); | |
351 | if (locked) { | |
352 | *fe_status |= FE_HAS_SIGNAL | FE_HAS_CARRIER | | |
353 | FE_HAS_VITERBI | FE_HAS_SYNC | FE_HAS_LOCK; | |
354 | } | |
355 | dprintk("%s: fe_status=0x%x\n", __func__, *fe_status); | |
356 | ||
357 | atbm8830_read_reg(priv, REG_AGC_LOCK, &agc_locked); | |
358 | dprintk("AGC Lock: %d\n", agc_locked); | |
359 | ||
360 | return 0; | |
361 | } | |
362 | ||
363 | static int atbm8830_read_ber(struct dvb_frontend *fe, u32 *ber) | |
364 | { | |
365 | struct atbm_state *priv = fe->demodulator_priv; | |
366 | u32 frame_err; | |
367 | u8 t; | |
368 | ||
369 | dprintk("%s\n", __func__); | |
370 | ||
371 | atbm8830_reglatch_lock(priv, 1); | |
372 | ||
373 | atbm8830_read_reg(priv, REG_FRAME_ERR_CNT + 1, &t); | |
374 | frame_err = t & 0x7F; | |
375 | frame_err <<= 8; | |
376 | atbm8830_read_reg(priv, REG_FRAME_ERR_CNT, &t); | |
377 | frame_err |= t; | |
378 | ||
379 | atbm8830_reglatch_lock(priv, 0); | |
380 | ||
381 | *ber = frame_err * 100 / 32767; | |
382 | ||
383 | dprintk("%s: ber=0x%x\n", __func__, *ber); | |
384 | return 0; | |
385 | } | |
386 | ||
387 | static int atbm8830_read_signal_strength(struct dvb_frontend *fe, u16 *signal) | |
388 | { | |
389 | struct atbm_state *priv = fe->demodulator_priv; | |
390 | u32 pwm; | |
391 | u8 t; | |
392 | ||
393 | dprintk("%s\n", __func__); | |
394 | atbm8830_reglatch_lock(priv, 1); | |
395 | ||
396 | atbm8830_read_reg(priv, REG_AGC_PWM_VAL + 1, &t); | |
397 | pwm = t & 0x03; | |
398 | pwm <<= 8; | |
399 | atbm8830_read_reg(priv, REG_AGC_PWM_VAL, &t); | |
400 | pwm |= t; | |
401 | ||
402 | atbm8830_reglatch_lock(priv, 0); | |
403 | ||
404 | dprintk("AGC PWM = 0x%02X\n", pwm); | |
405 | pwm = 0x400 - pwm; | |
406 | ||
407 | *signal = pwm * 0x10000 / 0x400; | |
408 | ||
409 | return 0; | |
410 | } | |
411 | ||
412 | static int atbm8830_read_snr(struct dvb_frontend *fe, u16 *snr) | |
413 | { | |
414 | dprintk("%s\n", __func__); | |
415 | *snr = 0; | |
416 | return 0; | |
417 | } | |
418 | ||
419 | static int atbm8830_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks) | |
420 | { | |
421 | dprintk("%s\n", __func__); | |
422 | *ucblocks = 0; | |
423 | return 0; | |
424 | } | |
425 | ||
426 | static int atbm8830_i2c_gate_ctrl(struct dvb_frontend *fe, int enable) | |
427 | { | |
428 | struct atbm_state *priv = fe->demodulator_priv; | |
429 | ||
430 | return atbm8830_write_reg(priv, REG_I2C_GATE, enable ? 1 : 0); | |
431 | } | |
432 | ||
433 | static struct dvb_frontend_ops atbm8830_ops = { | |
434 | .info = { | |
435 | .name = "AltoBeam ATBM8830/8831 DMB-TH", | |
436 | .type = FE_OFDM, | |
437 | .frequency_min = 474000000, | |
438 | .frequency_max = 858000000, | |
439 | .frequency_stepsize = 10000, | |
440 | .caps = | |
441 | FE_CAN_FEC_AUTO | | |
442 | FE_CAN_QAM_AUTO | | |
443 | FE_CAN_TRANSMISSION_MODE_AUTO | | |
444 | FE_CAN_GUARD_INTERVAL_AUTO | |
445 | }, | |
446 | ||
447 | .release = atbm8830_release, | |
448 | ||
449 | .init = atbm8830_init, | |
450 | .sleep = NULL, | |
451 | .write = NULL, | |
452 | .i2c_gate_ctrl = atbm8830_i2c_gate_ctrl, | |
453 | ||
454 | .set_frontend = atbm8830_set_fe, | |
455 | .get_frontend = atbm8830_get_fe, | |
456 | .get_tune_settings = atbm8830_get_tune_settings, | |
457 | ||
458 | .read_status = atbm8830_read_status, | |
459 | .read_ber = atbm8830_read_ber, | |
460 | .read_signal_strength = atbm8830_read_signal_strength, | |
461 | .read_snr = atbm8830_read_snr, | |
462 | .read_ucblocks = atbm8830_read_ucblocks, | |
463 | }; | |
464 | ||
465 | struct dvb_frontend *atbm8830_attach(const struct atbm8830_config *config, | |
466 | struct i2c_adapter *i2c) | |
467 | { | |
468 | struct atbm_state *priv = NULL; | |
469 | u8 data = 0; | |
470 | ||
471 | dprintk("%s()\n", __func__); | |
472 | ||
473 | if (config == NULL || i2c == NULL) | |
474 | return NULL; | |
475 | ||
476 | priv = kzalloc(sizeof(struct atbm_state), GFP_KERNEL); | |
477 | if (priv == NULL) | |
478 | goto error_out; | |
479 | ||
480 | priv->config = config; | |
481 | priv->i2c = i2c; | |
482 | ||
483 | /* check if the demod is there */ | |
484 | if (atbm8830_read_reg(priv, REG_CHIP_ID, &data) != 0) { | |
485 | dprintk("%s atbm8830/8831 not found at i2c addr 0x%02X\n", | |
486 | __func__, priv->config->demod_address); | |
487 | goto error_out; | |
488 | } | |
489 | dprintk("atbm8830 chip id: 0x%02X\n", data); | |
490 | ||
491 | memcpy(&priv->frontend.ops, &atbm8830_ops, | |
492 | sizeof(struct dvb_frontend_ops)); | |
493 | priv->frontend.demodulator_priv = priv; | |
494 | ||
495 | atbm8830_init(&priv->frontend); | |
496 | ||
497 | atbm8830_i2c_gate_ctrl(&priv->frontend, 1); | |
498 | ||
499 | return &priv->frontend; | |
500 | ||
501 | error_out: | |
502 | dprintk("%s() error_out\n", __func__); | |
503 | kfree(priv); | |
504 | return NULL; | |
505 | ||
506 | } | |
507 | EXPORT_SYMBOL(atbm8830_attach); | |
508 | ||
509 | MODULE_DESCRIPTION("AltoBeam ATBM8830/8831 GB20600 demodulator driver"); | |
510 | MODULE_AUTHOR("David T. L. Wong <davidtlwong@gmail.com>"); | |
511 | MODULE_LICENSE("GPL"); |