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18#include <asm/div64.h>
19#include <media/dvb_frontend.h>
20
21#include "atbm8830.h"
22#include "atbm8830_priv.h"
23
24#define dprintk(args...) \
25 do { \
26 if (debug) \
27 printk(KERN_DEBUG "atbm8830: " args); \
28 } while (0)
29
30static int debug;
31
32module_param(debug, int, 0644);
33MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
34
35static int atbm8830_write_reg(struct atbm_state *priv, u16 reg, u8 data)
36{
37 int ret = 0;
38 u8 dev_addr;
39 u8 buf1[] = { reg >> 8, reg & 0xFF };
40 u8 buf2[] = { data };
41 struct i2c_msg msg1 = { .flags = 0, .buf = buf1, .len = 2 };
42 struct i2c_msg msg2 = { .flags = 0, .buf = buf2, .len = 1 };
43
44 dev_addr = priv->config->demod_address;
45 msg1.addr = dev_addr;
46 msg2.addr = dev_addr;
47
48 if (debug >= 2)
49 dprintk("%s: reg=0x%04X, data=0x%02X\n", __func__, reg, data);
50
51 ret = i2c_transfer(priv->i2c, &msg1, 1);
52 if (ret != 1)
53 return -EIO;
54
55 ret = i2c_transfer(priv->i2c, &msg2, 1);
56 return (ret != 1) ? -EIO : 0;
57}
58
59static int atbm8830_read_reg(struct atbm_state *priv, u16 reg, u8 *p_data)
60{
61 int ret;
62 u8 dev_addr;
63
64 u8 buf1[] = { reg >> 8, reg & 0xFF };
65 u8 buf2[] = { 0 };
66 struct i2c_msg msg1 = { .flags = 0, .buf = buf1, .len = 2 };
67 struct i2c_msg msg2 = { .flags = I2C_M_RD, .buf = buf2, .len = 1 };
68
69 dev_addr = priv->config->demod_address;
70 msg1.addr = dev_addr;
71 msg2.addr = dev_addr;
72
73 ret = i2c_transfer(priv->i2c, &msg1, 1);
74 if (ret != 1) {
75 dprintk("%s: error reg=0x%04x, ret=%i\n", __func__, reg, ret);
76 return -EIO;
77 }
78
79 ret = i2c_transfer(priv->i2c, &msg2, 1);
80 if (ret != 1)
81 return -EIO;
82
83 *p_data = buf2[0];
84 if (debug >= 2)
85 dprintk("%s: reg=0x%04X, data=0x%02X\n",
86 __func__, reg, buf2[0]);
87
88 return 0;
89}
90
91
92static inline int atbm8830_reglatch_lock(struct atbm_state *priv, int lock)
93{
94 return atbm8830_write_reg(priv, REG_READ_LATCH, lock ? 1 : 0);
95}
96
97static int set_osc_freq(struct atbm_state *priv, u32 freq )
98{
99 u32 val;
100 u64 t;
101
102
103 t = (u64)0x100000 * freq;
104 do_div(t, 30400);
105 val = t;
106
107 atbm8830_write_reg(priv, REG_OSC_CLK, val);
108 atbm8830_write_reg(priv, REG_OSC_CLK + 1, val >> 8);
109 atbm8830_write_reg(priv, REG_OSC_CLK + 2, val >> 16);
110
111 return 0;
112}
113
114static int set_if_freq(struct atbm_state *priv, u32 freq )
115{
116
117 u32 fs = priv->config->osc_clk_freq;
118 u64 t;
119 u32 val;
120 u8 dat;
121
122 if (freq != 0) {
123
124 t = (u64) 2 * 31416 * (freq - fs);
125 t <<= 22;
126 do_div(t, fs);
127 do_div(t, 1000);
128 val = t;
129
130 atbm8830_write_reg(priv, REG_TUNER_BASEBAND, 1);
131 atbm8830_write_reg(priv, REG_IF_FREQ, val);
132 atbm8830_write_reg(priv, REG_IF_FREQ+1, val >> 8);
133 atbm8830_write_reg(priv, REG_IF_FREQ+2, val >> 16);
134
135 atbm8830_read_reg(priv, REG_ADC_CONFIG, &dat);
136 dat &= 0xFC;
137 atbm8830_write_reg(priv, REG_ADC_CONFIG, dat);
138 } else {
139
140 atbm8830_write_reg(priv, REG_TUNER_BASEBAND, 0);
141
142 atbm8830_read_reg(priv, REG_ADC_CONFIG, &dat);
143 dat &= 0xFC;
144 dat |= 0x02;
145 atbm8830_write_reg(priv, REG_ADC_CONFIG, dat);
146
147 if (priv->config->zif_swap_iq)
148 atbm8830_write_reg(priv, REG_SWAP_I_Q, 0x03);
149 else
150 atbm8830_write_reg(priv, REG_SWAP_I_Q, 0x01);
151 }
152
153 return 0;
154}
155
156static int is_locked(struct atbm_state *priv, u8 *locked)
157{
158 u8 status;
159
160 atbm8830_read_reg(priv, REG_LOCK_STATUS, &status);
161
162 if (locked != NULL)
163 *locked = (status == 1);
164 return 0;
165}
166
167static int set_agc_config(struct atbm_state *priv,
168 u8 min, u8 max, u8 hold_loop)
169{
170
171 if (!min && !max)
172 return 0;
173
174 atbm8830_write_reg(priv, REG_AGC_MIN, min);
175 atbm8830_write_reg(priv, REG_AGC_MAX, max);
176 atbm8830_write_reg(priv, REG_AGC_HOLD_LOOP, hold_loop);
177
178 return 0;
179}
180
181static int set_static_channel_mode(struct atbm_state *priv)
182{
183 int i;
184
185 for (i = 0; i < 5; i++)
186 atbm8830_write_reg(priv, 0x099B + i, 0x08);
187
188 atbm8830_write_reg(priv, 0x095B, 0x7F);
189 atbm8830_write_reg(priv, 0x09CB, 0x01);
190 atbm8830_write_reg(priv, 0x09CC, 0x7F);
191 atbm8830_write_reg(priv, 0x09CD, 0x7F);
192 atbm8830_write_reg(priv, 0x0E01, 0x20);
193
194
195 atbm8830_write_reg(priv, 0x0B03, 0x0A);
196 atbm8830_write_reg(priv, 0x0935, 0x10);
197 atbm8830_write_reg(priv, 0x0936, 0x08);
198 atbm8830_write_reg(priv, 0x093E, 0x08);
199 atbm8830_write_reg(priv, 0x096E, 0x06);
200
201
202 atbm8830_write_reg(priv, 0x0B09, 0x00);
203
204 atbm8830_write_reg(priv, 0x0B0A, 0x08);
205
206 return 0;
207}
208
209static int set_ts_config(struct atbm_state *priv)
210{
211 const struct atbm8830_config *cfg = priv->config;
212
213
214 atbm8830_write_reg(priv, REG_TS_SERIAL, cfg->serial_ts ? 1 : 0);
215 atbm8830_write_reg(priv, REG_TS_CLK_MODE, cfg->serial_ts ? 1 : 0);
216
217 atbm8830_write_reg(priv, REG_TS_SAMPLE_EDGE,
218 cfg->ts_sampling_edge ? 1 : 0);
219
220 atbm8830_write_reg(priv, REG_TS_CLK_FREERUN,
221 cfg->ts_clk_gated ? 0 : 1);
222
223 return 0;
224}
225
226static int atbm8830_init(struct dvb_frontend *fe)
227{
228 struct atbm_state *priv = fe->demodulator_priv;
229 const struct atbm8830_config *cfg = priv->config;
230
231
232 set_osc_freq(priv, cfg->osc_clk_freq);
233
234
235 set_if_freq(priv, cfg->if_freq);
236
237
238 set_agc_config(priv, cfg->agc_min, cfg->agc_max,
239 cfg->agc_hold_loop);
240
241
242 set_static_channel_mode(priv);
243
244 set_ts_config(priv);
245
246 atbm8830_write_reg(priv, 0x000A, 0);
247
248
249 atbm8830_write_reg(priv, 0x020C, 11);
250
251
252 atbm8830_write_reg(priv, REG_DEMOD_RUN, 1);
253
254 return 0;
255}
256
257
258static void atbm8830_release(struct dvb_frontend *fe)
259{
260 struct atbm_state *state = fe->demodulator_priv;
261 dprintk("%s\n", __func__);
262
263 kfree(state);
264}
265
266static int atbm8830_set_fe(struct dvb_frontend *fe)
267{
268 struct atbm_state *priv = fe->demodulator_priv;
269 int i;
270 u8 locked = 0;
271 dprintk("%s\n", __func__);
272
273
274 if (fe->ops.tuner_ops.set_params) {
275 if (fe->ops.i2c_gate_ctrl)
276 fe->ops.i2c_gate_ctrl(fe, 1);
277 fe->ops.tuner_ops.set_params(fe);
278 if (fe->ops.i2c_gate_ctrl)
279 fe->ops.i2c_gate_ctrl(fe, 0);
280 }
281
282
283 for (i = 0; i < 10; i++) {
284 mdelay(100);
285 dprintk("Try %d\n", i);
286 is_locked(priv, &locked);
287 if (locked != 0) {
288 dprintk("ATBM8830 locked!\n");
289 break;
290 }
291 }
292
293 return 0;
294}
295
296static int atbm8830_get_fe(struct dvb_frontend *fe,
297 struct dtv_frontend_properties *c)
298{
299 dprintk("%s\n", __func__);
300
301
302
303 c->inversion = INVERSION_OFF;
304
305
306 c->bandwidth_hz = 8000000;
307
308 c->code_rate_HP = FEC_AUTO;
309 c->code_rate_LP = FEC_AUTO;
310
311 c->modulation = QAM_AUTO;
312
313
314 c->transmission_mode = TRANSMISSION_MODE_AUTO;
315
316
317 c->guard_interval = GUARD_INTERVAL_AUTO;
318
319
320 c->hierarchy = HIERARCHY_NONE;
321
322 return 0;
323}
324
325static int atbm8830_get_tune_settings(struct dvb_frontend *fe,
326 struct dvb_frontend_tune_settings *fesettings)
327{
328 fesettings->min_delay_ms = 0;
329 fesettings->step_size = 0;
330 fesettings->max_drift = 0;
331 return 0;
332}
333
334static int atbm8830_read_status(struct dvb_frontend *fe,
335 enum fe_status *fe_status)
336{
337 struct atbm_state *priv = fe->demodulator_priv;
338 u8 locked = 0;
339 u8 agc_locked = 0;
340
341 dprintk("%s\n", __func__);
342 *fe_status = 0;
343
344 is_locked(priv, &locked);
345 if (locked) {
346 *fe_status |= FE_HAS_SIGNAL | FE_HAS_CARRIER |
347 FE_HAS_VITERBI | FE_HAS_SYNC | FE_HAS_LOCK;
348 }
349 dprintk("%s: fe_status=0x%x\n", __func__, *fe_status);
350
351 atbm8830_read_reg(priv, REG_AGC_LOCK, &agc_locked);
352 dprintk("AGC Lock: %d\n", agc_locked);
353
354 return 0;
355}
356
357static int atbm8830_read_ber(struct dvb_frontend *fe, u32 *ber)
358{
359 struct atbm_state *priv = fe->demodulator_priv;
360 u32 frame_err;
361 u8 t;
362
363 dprintk("%s\n", __func__);
364
365 atbm8830_reglatch_lock(priv, 1);
366
367 atbm8830_read_reg(priv, REG_FRAME_ERR_CNT + 1, &t);
368 frame_err = t & 0x7F;
369 frame_err <<= 8;
370 atbm8830_read_reg(priv, REG_FRAME_ERR_CNT, &t);
371 frame_err |= t;
372
373 atbm8830_reglatch_lock(priv, 0);
374
375 *ber = frame_err * 100 / 32767;
376
377 dprintk("%s: ber=0x%x\n", __func__, *ber);
378 return 0;
379}
380
381static int atbm8830_read_signal_strength(struct dvb_frontend *fe, u16 *signal)
382{
383 struct atbm_state *priv = fe->demodulator_priv;
384 u32 pwm;
385 u8 t;
386
387 dprintk("%s\n", __func__);
388 atbm8830_reglatch_lock(priv, 1);
389
390 atbm8830_read_reg(priv, REG_AGC_PWM_VAL + 1, &t);
391 pwm = t & 0x03;
392 pwm <<= 8;
393 atbm8830_read_reg(priv, REG_AGC_PWM_VAL, &t);
394 pwm |= t;
395
396 atbm8830_reglatch_lock(priv, 0);
397
398 dprintk("AGC PWM = 0x%02X\n", pwm);
399 pwm = 0x400 - pwm;
400
401 *signal = pwm * 0x10000 / 0x400;
402
403 return 0;
404}
405
406static int atbm8830_read_snr(struct dvb_frontend *fe, u16 *snr)
407{
408 dprintk("%s\n", __func__);
409 *snr = 0;
410 return 0;
411}
412
413static int atbm8830_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
414{
415 dprintk("%s\n", __func__);
416 *ucblocks = 0;
417 return 0;
418}
419
420static int atbm8830_i2c_gate_ctrl(struct dvb_frontend *fe, int enable)
421{
422 struct atbm_state *priv = fe->demodulator_priv;
423
424 return atbm8830_write_reg(priv, REG_I2C_GATE, enable ? 1 : 0);
425}
426
427static const struct dvb_frontend_ops atbm8830_ops = {
428 .delsys = { SYS_DTMB },
429 .info = {
430 .name = "AltoBeam ATBM8830/8831 DMB-TH",
431 .frequency_min = 474000000,
432 .frequency_max = 858000000,
433 .frequency_stepsize = 10000,
434 .caps =
435 FE_CAN_FEC_AUTO |
436 FE_CAN_QAM_AUTO |
437 FE_CAN_TRANSMISSION_MODE_AUTO |
438 FE_CAN_GUARD_INTERVAL_AUTO
439 },
440
441 .release = atbm8830_release,
442
443 .init = atbm8830_init,
444 .sleep = NULL,
445 .write = NULL,
446 .i2c_gate_ctrl = atbm8830_i2c_gate_ctrl,
447
448 .set_frontend = atbm8830_set_fe,
449 .get_frontend = atbm8830_get_fe,
450 .get_tune_settings = atbm8830_get_tune_settings,
451
452 .read_status = atbm8830_read_status,
453 .read_ber = atbm8830_read_ber,
454 .read_signal_strength = atbm8830_read_signal_strength,
455 .read_snr = atbm8830_read_snr,
456 .read_ucblocks = atbm8830_read_ucblocks,
457};
458
459struct dvb_frontend *atbm8830_attach(const struct atbm8830_config *config,
460 struct i2c_adapter *i2c)
461{
462 struct atbm_state *priv = NULL;
463 u8 data = 0;
464
465 dprintk("%s()\n", __func__);
466
467 if (config == NULL || i2c == NULL)
468 return NULL;
469
470 priv = kzalloc(sizeof(struct atbm_state), GFP_KERNEL);
471 if (priv == NULL)
472 goto error_out;
473
474 priv->config = config;
475 priv->i2c = i2c;
476
477
478 if (atbm8830_read_reg(priv, REG_CHIP_ID, &data) != 0) {
479 dprintk("%s atbm8830/8831 not found at i2c addr 0x%02X\n",
480 __func__, priv->config->demod_address);
481 goto error_out;
482 }
483 dprintk("atbm8830 chip id: 0x%02X\n", data);
484
485 memcpy(&priv->frontend.ops, &atbm8830_ops,
486 sizeof(struct dvb_frontend_ops));
487 priv->frontend.demodulator_priv = priv;
488
489 atbm8830_init(&priv->frontend);
490
491 atbm8830_i2c_gate_ctrl(&priv->frontend, 1);
492
493 return &priv->frontend;
494
495error_out:
496 dprintk("%s() error_out\n", __func__);
497 kfree(priv);
498 return NULL;
499
500}
501EXPORT_SYMBOL(atbm8830_attach);
502
503MODULE_DESCRIPTION("AltoBeam ATBM8830/8831 GB20600 demodulator driver");
504MODULE_AUTHOR("David T. L. Wong <davidtlwong@gmail.com>");
505MODULE_LICENSE("GPL");
506
