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c942fddf | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
ec27b6aa DW |
2 | /* |
3 | * Support for AltoBeam GB20600 (a.k.a DMB-TH) demodulator | |
4 | * ATBM8830, ATBM8831 | |
5 | * | |
6 | * Copyright (C) 2009 David T.L. Wong <davidtlwong@gmail.com> | |
ec27b6aa DW |
7 | */ |
8 | ||
92fda216 | 9 | #include <asm/div64.h> |
fada1935 | 10 | #include <media/dvb_frontend.h> |
ec27b6aa DW |
11 | |
12 | #include "atbm8830.h" | |
13 | #include "atbm8830_priv.h" | |
14 | ||
15 | #define dprintk(args...) \ | |
16 | do { \ | |
17 | if (debug) \ | |
18 | printk(KERN_DEBUG "atbm8830: " args); \ | |
19 | } while (0) | |
20 | ||
21 | static int debug; | |
22 | ||
23 | module_param(debug, int, 0644); | |
24 | MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off)."); | |
25 | ||
26 | static int atbm8830_write_reg(struct atbm_state *priv, u16 reg, u8 data) | |
27 | { | |
28 | int ret = 0; | |
29 | u8 dev_addr; | |
30 | u8 buf1[] = { reg >> 8, reg & 0xFF }; | |
31 | u8 buf2[] = { data }; | |
32 | struct i2c_msg msg1 = { .flags = 0, .buf = buf1, .len = 2 }; | |
33 | struct i2c_msg msg2 = { .flags = 0, .buf = buf2, .len = 1 }; | |
34 | ||
35 | dev_addr = priv->config->demod_address; | |
36 | msg1.addr = dev_addr; | |
37 | msg2.addr = dev_addr; | |
38 | ||
39 | if (debug >= 2) | |
c429e7b6 | 40 | dprintk("%s: reg=0x%04X, data=0x%02X\n", __func__, reg, data); |
ec27b6aa DW |
41 | |
42 | ret = i2c_transfer(priv->i2c, &msg1, 1); | |
43 | if (ret != 1) | |
44 | return -EIO; | |
45 | ||
46 | ret = i2c_transfer(priv->i2c, &msg2, 1); | |
47 | return (ret != 1) ? -EIO : 0; | |
48 | } | |
49 | ||
50 | static int atbm8830_read_reg(struct atbm_state *priv, u16 reg, u8 *p_data) | |
51 | { | |
52 | int ret; | |
53 | u8 dev_addr; | |
54 | ||
55 | u8 buf1[] = { reg >> 8, reg & 0xFF }; | |
56 | u8 buf2[] = { 0 }; | |
57 | struct i2c_msg msg1 = { .flags = 0, .buf = buf1, .len = 2 }; | |
58 | struct i2c_msg msg2 = { .flags = I2C_M_RD, .buf = buf2, .len = 1 }; | |
59 | ||
60 | dev_addr = priv->config->demod_address; | |
61 | msg1.addr = dev_addr; | |
62 | msg2.addr = dev_addr; | |
63 | ||
64 | ret = i2c_transfer(priv->i2c, &msg1, 1); | |
65 | if (ret != 1) { | |
c429e7b6 | 66 | dprintk("%s: error reg=0x%04x, ret=%i\n", __func__, reg, ret); |
ec27b6aa DW |
67 | return -EIO; |
68 | } | |
69 | ||
70 | ret = i2c_transfer(priv->i2c, &msg2, 1); | |
71 | if (ret != 1) | |
72 | return -EIO; | |
73 | ||
74 | *p_data = buf2[0]; | |
75 | if (debug >= 2) | |
c429e7b6 | 76 | dprintk("%s: reg=0x%04X, data=0x%02X\n", |
ec27b6aa DW |
77 | __func__, reg, buf2[0]); |
78 | ||
79 | return 0; | |
80 | } | |
81 | ||
82 | /* Lock register latch so that multi-register read is atomic */ | |
83 | static inline int atbm8830_reglatch_lock(struct atbm_state *priv, int lock) | |
84 | { | |
85 | return atbm8830_write_reg(priv, REG_READ_LATCH, lock ? 1 : 0); | |
86 | } | |
87 | ||
88 | static int set_osc_freq(struct atbm_state *priv, u32 freq /*in kHz*/) | |
89 | { | |
90 | u32 val; | |
92fda216 | 91 | u64 t; |
ec27b6aa | 92 | |
92fda216 DW |
93 | /* 0x100000 * freq / 30.4MHz */ |
94 | t = (u64)0x100000 * freq; | |
95 | do_div(t, 30400); | |
96 | val = t; | |
ec27b6aa DW |
97 | |
98 | atbm8830_write_reg(priv, REG_OSC_CLK, val); | |
99 | atbm8830_write_reg(priv, REG_OSC_CLK + 1, val >> 8); | |
100 | atbm8830_write_reg(priv, REG_OSC_CLK + 2, val >> 16); | |
101 | ||
102 | return 0; | |
103 | } | |
104 | ||
105 | static int set_if_freq(struct atbm_state *priv, u32 freq /*in kHz*/) | |
106 | { | |
b8415f53 | 107 | |
ec27b6aa | 108 | u32 fs = priv->config->osc_clk_freq; |
92fda216 | 109 | u64 t; |
ec27b6aa DW |
110 | u32 val; |
111 | u8 dat; | |
112 | ||
ec27b6aa | 113 | if (freq != 0) { |
92fda216 DW |
114 | /* 2 * PI * (freq - fs) / fs * (2 ^ 22) */ |
115 | t = (u64) 2 * 31416 * (freq - fs); | |
116 | t <<= 22; | |
117 | do_div(t, fs); | |
118 | do_div(t, 1000); | |
119 | val = t; | |
120 | ||
ec27b6aa DW |
121 | atbm8830_write_reg(priv, REG_TUNER_BASEBAND, 1); |
122 | atbm8830_write_reg(priv, REG_IF_FREQ, val); | |
123 | atbm8830_write_reg(priv, REG_IF_FREQ+1, val >> 8); | |
124 | atbm8830_write_reg(priv, REG_IF_FREQ+2, val >> 16); | |
125 | ||
126 | atbm8830_read_reg(priv, REG_ADC_CONFIG, &dat); | |
127 | dat &= 0xFC; | |
128 | atbm8830_write_reg(priv, REG_ADC_CONFIG, dat); | |
129 | } else { | |
130 | /* Zero IF */ | |
131 | atbm8830_write_reg(priv, REG_TUNER_BASEBAND, 0); | |
132 | ||
133 | atbm8830_read_reg(priv, REG_ADC_CONFIG, &dat); | |
134 | dat &= 0xFC; | |
135 | dat |= 0x02; | |
136 | atbm8830_write_reg(priv, REG_ADC_CONFIG, dat); | |
137 | ||
138 | if (priv->config->zif_swap_iq) | |
139 | atbm8830_write_reg(priv, REG_SWAP_I_Q, 0x03); | |
140 | else | |
141 | atbm8830_write_reg(priv, REG_SWAP_I_Q, 0x01); | |
142 | } | |
143 | ||
144 | return 0; | |
145 | } | |
146 | ||
147 | static int is_locked(struct atbm_state *priv, u8 *locked) | |
148 | { | |
149 | u8 status; | |
150 | ||
151 | atbm8830_read_reg(priv, REG_LOCK_STATUS, &status); | |
152 | ||
153 | if (locked != NULL) | |
154 | *locked = (status == 1); | |
155 | return 0; | |
156 | } | |
157 | ||
c245c75c DW |
158 | static int set_agc_config(struct atbm_state *priv, |
159 | u8 min, u8 max, u8 hold_loop) | |
160 | { | |
161 | /* no effect if both min and max are zero */ | |
162 | if (!min && !max) | |
163 | return 0; | |
164 | ||
165 | atbm8830_write_reg(priv, REG_AGC_MIN, min); | |
166 | atbm8830_write_reg(priv, REG_AGC_MAX, max); | |
167 | atbm8830_write_reg(priv, REG_AGC_HOLD_LOOP, hold_loop); | |
168 | ||
169 | return 0; | |
170 | } | |
ec27b6aa DW |
171 | |
172 | static int set_static_channel_mode(struct atbm_state *priv) | |
173 | { | |
174 | int i; | |
175 | ||
176 | for (i = 0; i < 5; i++) | |
177 | atbm8830_write_reg(priv, 0x099B + i, 0x08); | |
178 | ||
179 | atbm8830_write_reg(priv, 0x095B, 0x7F); | |
180 | atbm8830_write_reg(priv, 0x09CB, 0x01); | |
181 | atbm8830_write_reg(priv, 0x09CC, 0x7F); | |
182 | atbm8830_write_reg(priv, 0x09CD, 0x7F); | |
183 | atbm8830_write_reg(priv, 0x0E01, 0x20); | |
184 | ||
185 | /* For single carrier */ | |
186 | atbm8830_write_reg(priv, 0x0B03, 0x0A); | |
187 | atbm8830_write_reg(priv, 0x0935, 0x10); | |
188 | atbm8830_write_reg(priv, 0x0936, 0x08); | |
189 | atbm8830_write_reg(priv, 0x093E, 0x08); | |
190 | atbm8830_write_reg(priv, 0x096E, 0x06); | |
191 | ||
192 | /* frame_count_max0 */ | |
193 | atbm8830_write_reg(priv, 0x0B09, 0x00); | |
194 | /* frame_count_max1 */ | |
195 | atbm8830_write_reg(priv, 0x0B0A, 0x08); | |
196 | ||
197 | return 0; | |
198 | } | |
199 | ||
200 | static int set_ts_config(struct atbm_state *priv) | |
201 | { | |
202 | const struct atbm8830_config *cfg = priv->config; | |
203 | ||
204 | /*Set parallel/serial ts mode*/ | |
205 | atbm8830_write_reg(priv, REG_TS_SERIAL, cfg->serial_ts ? 1 : 0); | |
206 | atbm8830_write_reg(priv, REG_TS_CLK_MODE, cfg->serial_ts ? 1 : 0); | |
207 | /*Set ts sampling edge*/ | |
208 | atbm8830_write_reg(priv, REG_TS_SAMPLE_EDGE, | |
209 | cfg->ts_sampling_edge ? 1 : 0); | |
210 | /*Set ts clock freerun*/ | |
211 | atbm8830_write_reg(priv, REG_TS_CLK_FREERUN, | |
212 | cfg->ts_clk_gated ? 0 : 1); | |
213 | ||
214 | return 0; | |
215 | } | |
216 | ||
217 | static int atbm8830_init(struct dvb_frontend *fe) | |
218 | { | |
219 | struct atbm_state *priv = fe->demodulator_priv; | |
220 | const struct atbm8830_config *cfg = priv->config; | |
221 | ||
222 | /*Set oscillator frequency*/ | |
223 | set_osc_freq(priv, cfg->osc_clk_freq); | |
224 | ||
225 | /*Set IF frequency*/ | |
226 | set_if_freq(priv, cfg->if_freq); | |
227 | ||
c245c75c DW |
228 | /*Set AGC Config*/ |
229 | set_agc_config(priv, cfg->agc_min, cfg->agc_max, | |
230 | cfg->agc_hold_loop); | |
ec27b6aa DW |
231 | |
232 | /*Set static channel mode*/ | |
233 | set_static_channel_mode(priv); | |
234 | ||
235 | set_ts_config(priv); | |
236 | /*Turn off DSP reset*/ | |
237 | atbm8830_write_reg(priv, 0x000A, 0); | |
238 | ||
239 | /*SW version test*/ | |
240 | atbm8830_write_reg(priv, 0x020C, 11); | |
241 | ||
242 | /* Run */ | |
243 | atbm8830_write_reg(priv, REG_DEMOD_RUN, 1); | |
244 | ||
245 | return 0; | |
246 | } | |
247 | ||
248 | ||
249 | static void atbm8830_release(struct dvb_frontend *fe) | |
250 | { | |
251 | struct atbm_state *state = fe->demodulator_priv; | |
252 | dprintk("%s\n", __func__); | |
253 | ||
254 | kfree(state); | |
255 | } | |
256 | ||
a552438f | 257 | static int atbm8830_set_fe(struct dvb_frontend *fe) |
ec27b6aa DW |
258 | { |
259 | struct atbm_state *priv = fe->demodulator_priv; | |
260 | int i; | |
261 | u8 locked = 0; | |
262 | dprintk("%s\n", __func__); | |
263 | ||
264 | /* set frequency */ | |
265 | if (fe->ops.tuner_ops.set_params) { | |
266 | if (fe->ops.i2c_gate_ctrl) | |
267 | fe->ops.i2c_gate_ctrl(fe, 1); | |
14d24d14 | 268 | fe->ops.tuner_ops.set_params(fe); |
ec27b6aa DW |
269 | if (fe->ops.i2c_gate_ctrl) |
270 | fe->ops.i2c_gate_ctrl(fe, 0); | |
271 | } | |
272 | ||
273 | /* start auto lock */ | |
274 | for (i = 0; i < 10; i++) { | |
275 | mdelay(100); | |
276 | dprintk("Try %d\n", i); | |
277 | is_locked(priv, &locked); | |
278 | if (locked != 0) { | |
279 | dprintk("ATBM8830 locked!\n"); | |
280 | break; | |
281 | } | |
282 | } | |
283 | ||
284 | return 0; | |
285 | } | |
286 | ||
7e3e68bc MCC |
287 | static int atbm8830_get_fe(struct dvb_frontend *fe, |
288 | struct dtv_frontend_properties *c) | |
ec27b6aa DW |
289 | { |
290 | dprintk("%s\n", __func__); | |
291 | ||
292 | /* TODO: get real readings from device */ | |
293 | /* inversion status */ | |
a552438f | 294 | c->inversion = INVERSION_OFF; |
ec27b6aa DW |
295 | |
296 | /* bandwidth */ | |
a552438f | 297 | c->bandwidth_hz = 8000000; |
ec27b6aa | 298 | |
a552438f MCC |
299 | c->code_rate_HP = FEC_AUTO; |
300 | c->code_rate_LP = FEC_AUTO; | |
ec27b6aa | 301 | |
a552438f | 302 | c->modulation = QAM_AUTO; |
ec27b6aa DW |
303 | |
304 | /* transmission mode */ | |
a552438f | 305 | c->transmission_mode = TRANSMISSION_MODE_AUTO; |
ec27b6aa DW |
306 | |
307 | /* guard interval */ | |
a552438f | 308 | c->guard_interval = GUARD_INTERVAL_AUTO; |
ec27b6aa DW |
309 | |
310 | /* hierarchy */ | |
a552438f | 311 | c->hierarchy = HIERARCHY_NONE; |
ec27b6aa DW |
312 | |
313 | return 0; | |
314 | } | |
315 | ||
316 | static int atbm8830_get_tune_settings(struct dvb_frontend *fe, | |
317 | struct dvb_frontend_tune_settings *fesettings) | |
318 | { | |
319 | fesettings->min_delay_ms = 0; | |
320 | fesettings->step_size = 0; | |
321 | fesettings->max_drift = 0; | |
322 | return 0; | |
323 | } | |
324 | ||
0df289a2 MCC |
325 | static int atbm8830_read_status(struct dvb_frontend *fe, |
326 | enum fe_status *fe_status) | |
ec27b6aa DW |
327 | { |
328 | struct atbm_state *priv = fe->demodulator_priv; | |
329 | u8 locked = 0; | |
330 | u8 agc_locked = 0; | |
331 | ||
332 | dprintk("%s\n", __func__); | |
333 | *fe_status = 0; | |
334 | ||
335 | is_locked(priv, &locked); | |
336 | if (locked) { | |
337 | *fe_status |= FE_HAS_SIGNAL | FE_HAS_CARRIER | | |
338 | FE_HAS_VITERBI | FE_HAS_SYNC | FE_HAS_LOCK; | |
339 | } | |
340 | dprintk("%s: fe_status=0x%x\n", __func__, *fe_status); | |
341 | ||
342 | atbm8830_read_reg(priv, REG_AGC_LOCK, &agc_locked); | |
343 | dprintk("AGC Lock: %d\n", agc_locked); | |
344 | ||
345 | return 0; | |
346 | } | |
347 | ||
348 | static int atbm8830_read_ber(struct dvb_frontend *fe, u32 *ber) | |
349 | { | |
350 | struct atbm_state *priv = fe->demodulator_priv; | |
351 | u32 frame_err; | |
352 | u8 t; | |
353 | ||
354 | dprintk("%s\n", __func__); | |
355 | ||
356 | atbm8830_reglatch_lock(priv, 1); | |
357 | ||
358 | atbm8830_read_reg(priv, REG_FRAME_ERR_CNT + 1, &t); | |
359 | frame_err = t & 0x7F; | |
360 | frame_err <<= 8; | |
361 | atbm8830_read_reg(priv, REG_FRAME_ERR_CNT, &t); | |
362 | frame_err |= t; | |
363 | ||
364 | atbm8830_reglatch_lock(priv, 0); | |
365 | ||
366 | *ber = frame_err * 100 / 32767; | |
367 | ||
368 | dprintk("%s: ber=0x%x\n", __func__, *ber); | |
369 | return 0; | |
370 | } | |
371 | ||
372 | static int atbm8830_read_signal_strength(struct dvb_frontend *fe, u16 *signal) | |
373 | { | |
374 | struct atbm_state *priv = fe->demodulator_priv; | |
375 | u32 pwm; | |
376 | u8 t; | |
377 | ||
378 | dprintk("%s\n", __func__); | |
379 | atbm8830_reglatch_lock(priv, 1); | |
380 | ||
381 | atbm8830_read_reg(priv, REG_AGC_PWM_VAL + 1, &t); | |
382 | pwm = t & 0x03; | |
383 | pwm <<= 8; | |
384 | atbm8830_read_reg(priv, REG_AGC_PWM_VAL, &t); | |
385 | pwm |= t; | |
386 | ||
387 | atbm8830_reglatch_lock(priv, 0); | |
388 | ||
389 | dprintk("AGC PWM = 0x%02X\n", pwm); | |
390 | pwm = 0x400 - pwm; | |
391 | ||
392 | *signal = pwm * 0x10000 / 0x400; | |
393 | ||
394 | return 0; | |
395 | } | |
396 | ||
397 | static int atbm8830_read_snr(struct dvb_frontend *fe, u16 *snr) | |
398 | { | |
399 | dprintk("%s\n", __func__); | |
400 | *snr = 0; | |
401 | return 0; | |
402 | } | |
403 | ||
404 | static int atbm8830_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks) | |
405 | { | |
406 | dprintk("%s\n", __func__); | |
407 | *ucblocks = 0; | |
408 | return 0; | |
409 | } | |
410 | ||
411 | static int atbm8830_i2c_gate_ctrl(struct dvb_frontend *fe, int enable) | |
412 | { | |
413 | struct atbm_state *priv = fe->demodulator_priv; | |
414 | ||
415 | return atbm8830_write_reg(priv, REG_I2C_GATE, enable ? 1 : 0); | |
416 | } | |
417 | ||
bd336e63 | 418 | static const struct dvb_frontend_ops atbm8830_ops = { |
224b6642 | 419 | .delsys = { SYS_DTMB }, |
ec27b6aa DW |
420 | .info = { |
421 | .name = "AltoBeam ATBM8830/8831 DMB-TH", | |
f1b1eabf MCC |
422 | .frequency_min_hz = 474 * MHz, |
423 | .frequency_max_hz = 858 * MHz, | |
424 | .frequency_stepsize_hz = 10 * kHz, | |
ec27b6aa DW |
425 | .caps = |
426 | FE_CAN_FEC_AUTO | | |
427 | FE_CAN_QAM_AUTO | | |
428 | FE_CAN_TRANSMISSION_MODE_AUTO | | |
429 | FE_CAN_GUARD_INTERVAL_AUTO | |
430 | }, | |
431 | ||
432 | .release = atbm8830_release, | |
433 | ||
434 | .init = atbm8830_init, | |
435 | .sleep = NULL, | |
436 | .write = NULL, | |
437 | .i2c_gate_ctrl = atbm8830_i2c_gate_ctrl, | |
438 | ||
a552438f MCC |
439 | .set_frontend = atbm8830_set_fe, |
440 | .get_frontend = atbm8830_get_fe, | |
ec27b6aa DW |
441 | .get_tune_settings = atbm8830_get_tune_settings, |
442 | ||
443 | .read_status = atbm8830_read_status, | |
444 | .read_ber = atbm8830_read_ber, | |
445 | .read_signal_strength = atbm8830_read_signal_strength, | |
446 | .read_snr = atbm8830_read_snr, | |
447 | .read_ucblocks = atbm8830_read_ucblocks, | |
448 | }; | |
449 | ||
450 | struct dvb_frontend *atbm8830_attach(const struct atbm8830_config *config, | |
451 | struct i2c_adapter *i2c) | |
452 | { | |
453 | struct atbm_state *priv = NULL; | |
454 | u8 data = 0; | |
455 | ||
456 | dprintk("%s()\n", __func__); | |
457 | ||
458 | if (config == NULL || i2c == NULL) | |
459 | return NULL; | |
460 | ||
461 | priv = kzalloc(sizeof(struct atbm_state), GFP_KERNEL); | |
462 | if (priv == NULL) | |
463 | goto error_out; | |
464 | ||
465 | priv->config = config; | |
466 | priv->i2c = i2c; | |
467 | ||
468 | /* check if the demod is there */ | |
469 | if (atbm8830_read_reg(priv, REG_CHIP_ID, &data) != 0) { | |
470 | dprintk("%s atbm8830/8831 not found at i2c addr 0x%02X\n", | |
471 | __func__, priv->config->demod_address); | |
472 | goto error_out; | |
473 | } | |
474 | dprintk("atbm8830 chip id: 0x%02X\n", data); | |
475 | ||
476 | memcpy(&priv->frontend.ops, &atbm8830_ops, | |
477 | sizeof(struct dvb_frontend_ops)); | |
478 | priv->frontend.demodulator_priv = priv; | |
479 | ||
480 | atbm8830_init(&priv->frontend); | |
481 | ||
482 | atbm8830_i2c_gate_ctrl(&priv->frontend, 1); | |
483 | ||
484 | return &priv->frontend; | |
485 | ||
486 | error_out: | |
487 | dprintk("%s() error_out\n", __func__); | |
488 | kfree(priv); | |
489 | return NULL; | |
490 | ||
491 | } | |
492 | EXPORT_SYMBOL(atbm8830_attach); | |
493 | ||
494 | MODULE_DESCRIPTION("AltoBeam ATBM8830/8831 GB20600 demodulator driver"); | |
495 | MODULE_AUTHOR("David T. L. Wong <davidtlwong@gmail.com>"); | |
496 | MODULE_LICENSE("GPL"); |