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Merge tag 'perf-urgent-2023-09-10' of git://git.kernel.org/pub/scm/linux/kernel/git...
[tomoyo/tomoyo-test1.git] / drivers / media / dvb-frontends / or51132.c
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  *    Support for OR51132 (pcHDTV HD-3000) - VSB/QAM
4  *
5  *    Copyright (C) 2007 Trent Piepho <xyzzy@speakeasy.org>
6  *
7  *    Copyright (C) 2005 Kirk Lapray <kirk_lapray@bigfoot.com>
8  *
9  *    Based on code from Jack Kelliher (kelliher@xmission.com)
10  *                           Copyright (C) 2002 & pcHDTV, inc.
11 */
12
13 /*
14  * This driver needs two external firmware files. Please copy
15  * "dvb-fe-or51132-vsb.fw" and "dvb-fe-or51132-qam.fw" to
16  * /usr/lib/hotplug/firmware/ or /lib/firmware/
17  * (depending on configuration of firmware hotplug).
18  */
19 #define OR51132_VSB_FIRMWARE "dvb-fe-or51132-vsb.fw"
20 #define OR51132_QAM_FIRMWARE "dvb-fe-or51132-qam.fw"
21
22 #include <linux/kernel.h>
23 #include <linux/module.h>
24 #include <linux/init.h>
25 #include <linux/delay.h>
26 #include <linux/string.h>
27 #include <linux/slab.h>
28 #include <asm/byteorder.h>
29
30 #include <linux/int_log.h>
31 #include <media/dvb_frontend.h>
32 #include "or51132.h"
33
34 static int debug;
35 #define dprintk(args...) \
36         do { \
37                 if (debug) printk(KERN_DEBUG "or51132: " args); \
38         } while (0)
39
40
41 struct or51132_state
42 {
43         struct i2c_adapter* i2c;
44
45         /* Configuration settings */
46         const struct or51132_config* config;
47
48         struct dvb_frontend frontend;
49
50         /* Demodulator private data */
51         enum fe_modulation current_modulation;
52         u32 snr; /* Result of last SNR calculation */
53
54         /* Tuner private data */
55         u32 current_frequency;
56 };
57
58
59 /* Write buffer to demod */
60 static int or51132_writebuf(struct or51132_state *state, const u8 *buf, int len)
61 {
62         int err;
63         struct i2c_msg msg = { .addr = state->config->demod_address,
64                                .flags = 0, .buf = (u8*)buf, .len = len };
65
66         /* msleep(20); */ /* doesn't appear to be necessary */
67         if ((err = i2c_transfer(state->i2c, &msg, 1)) != 1) {
68                 printk(KERN_WARNING "or51132: I2C write (addr 0x%02x len %d) error: %d\n",
69                        msg.addr, msg.len, err);
70                 return -EREMOTEIO;
71         }
72         return 0;
73 }
74
75 /* Write constant bytes, e.g. or51132_writebytes(state, 0x04, 0x42, 0x00);
76    Less code and more efficient that loading a buffer on the stack with
77    the bytes to send and then calling or51132_writebuf() on that. */
78 #define or51132_writebytes(state, data...)  \
79         ({ static const u8 _data[] = {data}; \
80         or51132_writebuf(state, _data, sizeof(_data)); })
81
82 /* Read data from demod into buffer.  Returns 0 on success. */
83 static int or51132_readbuf(struct or51132_state *state, u8 *buf, int len)
84 {
85         int err;
86         struct i2c_msg msg = { .addr = state->config->demod_address,
87                                .flags = I2C_M_RD, .buf = buf, .len = len };
88
89         /* msleep(20); */ /* doesn't appear to be necessary */
90         if ((err = i2c_transfer(state->i2c, &msg, 1)) != 1) {
91                 printk(KERN_WARNING "or51132: I2C read (addr 0x%02x len %d) error: %d\n",
92                        msg.addr, msg.len, err);
93                 return -EREMOTEIO;
94         }
95         return 0;
96 }
97
98 /* Reads a 16-bit demod register.  Returns <0 on error. */
99 static int or51132_readreg(struct or51132_state *state, u8 reg)
100 {
101         u8 buf[2] = { 0x04, reg };
102         struct i2c_msg msg[2] = {
103                 {.addr = state->config->demod_address, .flags = 0,
104                  .buf = buf, .len = 2 },
105                 {.addr = state->config->demod_address, .flags = I2C_M_RD,
106                  .buf = buf, .len = 2 }};
107         int err;
108
109         if ((err = i2c_transfer(state->i2c, msg, 2)) != 2) {
110                 printk(KERN_WARNING "or51132: I2C error reading register %d: %d\n",
111                        reg, err);
112                 return -EREMOTEIO;
113         }
114         return buf[0] | (buf[1] << 8);
115 }
116
117 static int or51132_load_firmware (struct dvb_frontend* fe, const struct firmware *fw)
118 {
119         struct or51132_state* state = fe->demodulator_priv;
120         static const u8 run_buf[] = {0x7F,0x01};
121         u8 rec_buf[8];
122         u32 firmwareAsize, firmwareBsize;
123         int i,ret;
124
125         dprintk("Firmware is %zd bytes\n",fw->size);
126
127         /* Get size of firmware A and B */
128         firmwareAsize = le32_to_cpu(*((__le32*)fw->data));
129         dprintk("FirmwareA is %i bytes\n",firmwareAsize);
130         firmwareBsize = le32_to_cpu(*((__le32*)(fw->data+4)));
131         dprintk("FirmwareB is %i bytes\n",firmwareBsize);
132
133         /* Upload firmware */
134         if ((ret = or51132_writebuf(state, &fw->data[8], firmwareAsize))) {
135                 printk(KERN_WARNING "or51132: load_firmware error 1\n");
136                 return ret;
137         }
138         if ((ret = or51132_writebuf(state, &fw->data[8+firmwareAsize],
139                                     firmwareBsize))) {
140                 printk(KERN_WARNING "or51132: load_firmware error 2\n");
141                 return ret;
142         }
143
144         if ((ret = or51132_writebuf(state, run_buf, 2))) {
145                 printk(KERN_WARNING "or51132: load_firmware error 3\n");
146                 return ret;
147         }
148         if ((ret = or51132_writebuf(state, run_buf, 2))) {
149                 printk(KERN_WARNING "or51132: load_firmware error 4\n");
150                 return ret;
151         }
152
153         /* 50ms for operation to begin */
154         msleep(50);
155
156         /* Read back ucode version to besure we loaded correctly and are really up and running */
157         /* Get uCode version */
158         if ((ret = or51132_writebytes(state, 0x10, 0x10, 0x00))) {
159                 printk(KERN_WARNING "or51132: load_firmware error a\n");
160                 return ret;
161         }
162         if ((ret = or51132_writebytes(state, 0x04, 0x17))) {
163                 printk(KERN_WARNING "or51132: load_firmware error b\n");
164                 return ret;
165         }
166         if ((ret = or51132_writebytes(state, 0x00, 0x00))) {
167                 printk(KERN_WARNING "or51132: load_firmware error c\n");
168                 return ret;
169         }
170         for (i=0;i<4;i++) {
171                 /* Once upon a time, this command might have had something
172                    to do with getting the firmware version, but it's
173                    not used anymore:
174                    {0x04,0x00,0x30,0x00,i+1} */
175                 /* Read 8 bytes, two bytes at a time */
176                 if ((ret = or51132_readbuf(state, &rec_buf[i*2], 2))) {
177                         printk(KERN_WARNING
178                                "or51132: load_firmware error d - %d\n",i);
179                         return ret;
180                 }
181         }
182
183         printk(KERN_WARNING
184                "or51132: Version: %02X%02X%02X%02X-%02X%02X%02X%02X (%02X%01X-%01X-%02X%01X-%01X)\n",
185                rec_buf[1],rec_buf[0],rec_buf[3],rec_buf[2],
186                rec_buf[5],rec_buf[4],rec_buf[7],rec_buf[6],
187                rec_buf[3],rec_buf[2]>>4,rec_buf[2]&0x0f,
188                rec_buf[5],rec_buf[4]>>4,rec_buf[4]&0x0f);
189
190         if ((ret = or51132_writebytes(state, 0x10, 0x00, 0x00))) {
191                 printk(KERN_WARNING "or51132: load_firmware error e\n");
192                 return ret;
193         }
194         return 0;
195 };
196
197 static int or51132_init(struct dvb_frontend* fe)
198 {
199         return 0;
200 }
201
202 static int or51132_read_ber(struct dvb_frontend* fe, u32* ber)
203 {
204         *ber = 0;
205         return 0;
206 }
207
208 static int or51132_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
209 {
210         *ucblocks = 0;
211         return 0;
212 }
213
214 static int or51132_sleep(struct dvb_frontend* fe)
215 {
216         return 0;
217 }
218
219 static int or51132_setmode(struct dvb_frontend* fe)
220 {
221         struct or51132_state* state = fe->demodulator_priv;
222         u8 cmd_buf1[3] = {0x04, 0x01, 0x5f};
223         u8 cmd_buf2[3] = {0x1c, 0x00, 0 };
224
225         dprintk("setmode %d\n",(int)state->current_modulation);
226
227         switch (state->current_modulation) {
228         case VSB_8:
229                 /* Auto CH, Auto NTSC rej, MPEGser, MPEG2tr, phase noise-high */
230                 cmd_buf1[2] = 0x50;
231                 /* REC MODE inv IF spectrum, Normal */
232                 cmd_buf2[1] = 0x03;
233                 /* Channel MODE ATSC/VSB8 */
234                 cmd_buf2[2] = 0x06;
235                 break;
236         /* All QAM modes are:
237            Auto-deinterleave; MPEGser, MPEG2tr, phase noise-high
238            REC MODE Normal Carrier Lock */
239         case QAM_AUTO:
240                 /* Channel MODE Auto QAM64/256 */
241                 cmd_buf2[2] = 0x4f;
242                 break;
243         case QAM_256:
244                 /* Channel MODE QAM256 */
245                 cmd_buf2[2] = 0x45;
246                 break;
247         case QAM_64:
248                 /* Channel MODE QAM64 */
249                 cmd_buf2[2] = 0x43;
250                 break;
251         default:
252                 printk(KERN_WARNING
253                        "or51132: setmode: Modulation set to unsupported value (%d)\n",
254                        state->current_modulation);
255                 return -EINVAL;
256         }
257
258         /* Set Receiver 1 register */
259         if (or51132_writebuf(state, cmd_buf1, 3)) {
260                 printk(KERN_WARNING "or51132: set_mode error 1\n");
261                 return -EREMOTEIO;
262         }
263         dprintk("set #1 to %02x\n", cmd_buf1[2]);
264
265         /* Set operation mode in Receiver 6 register */
266         if (or51132_writebuf(state, cmd_buf2, 3)) {
267                 printk(KERN_WARNING "or51132: set_mode error 2\n");
268                 return -EREMOTEIO;
269         }
270         dprintk("set #6 to 0x%02x%02x\n", cmd_buf2[1], cmd_buf2[2]);
271
272         return 0;
273 }
274
275 /* Some modulations use the same firmware.  This classifies modulations
276    by the firmware they use. */
277 #define MOD_FWCLASS_UNKNOWN     0
278 #define MOD_FWCLASS_VSB         1
279 #define MOD_FWCLASS_QAM         2
280 static int modulation_fw_class(enum fe_modulation modulation)
281 {
282         switch(modulation) {
283         case VSB_8:
284                 return MOD_FWCLASS_VSB;
285         case QAM_AUTO:
286         case QAM_64:
287         case QAM_256:
288                 return MOD_FWCLASS_QAM;
289         default:
290                 return MOD_FWCLASS_UNKNOWN;
291         }
292 }
293
294 static int or51132_set_parameters(struct dvb_frontend *fe)
295 {
296         struct dtv_frontend_properties *p = &fe->dtv_property_cache;
297         int ret;
298         struct or51132_state* state = fe->demodulator_priv;
299         const struct firmware *fw;
300         const char *fwname;
301         int clock_mode;
302
303         /* Upload new firmware only if we need a different one */
304         if (modulation_fw_class(state->current_modulation) !=
305             modulation_fw_class(p->modulation)) {
306                 switch (modulation_fw_class(p->modulation)) {
307                 case MOD_FWCLASS_VSB:
308                         dprintk("set_parameters VSB MODE\n");
309                         fwname = OR51132_VSB_FIRMWARE;
310
311                         /* Set non-punctured clock for VSB */
312                         clock_mode = 0;
313                         break;
314                 case MOD_FWCLASS_QAM:
315                         dprintk("set_parameters QAM MODE\n");
316                         fwname = OR51132_QAM_FIRMWARE;
317
318                         /* Set punctured clock for QAM */
319                         clock_mode = 1;
320                         break;
321                 default:
322                         printk("or51132: Modulation type(%d) UNSUPPORTED\n",
323                                p->modulation);
324                         return -1;
325                 }
326                 printk("or51132: Waiting for firmware upload(%s)...\n",
327                        fwname);
328                 ret = request_firmware(&fw, fwname, state->i2c->dev.parent);
329                 if (ret) {
330                         printk(KERN_WARNING "or51132: No firmware uploaded(timeout or file not found?)\n");
331                         return ret;
332                 }
333                 ret = or51132_load_firmware(fe, fw);
334                 release_firmware(fw);
335                 if (ret) {
336                         printk(KERN_WARNING "or51132: Writing firmware to device failed!\n");
337                         return ret;
338                 }
339                 printk("or51132: Firmware upload complete.\n");
340                 state->config->set_ts_params(fe, clock_mode);
341         }
342         /* Change only if we are actually changing the modulation */
343         if (state->current_modulation != p->modulation) {
344                 state->current_modulation = p->modulation;
345                 or51132_setmode(fe);
346         }
347
348         if (fe->ops.tuner_ops.set_params) {
349                 fe->ops.tuner_ops.set_params(fe);
350                 if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0);
351         }
352
353         /* Set to current mode */
354         or51132_setmode(fe);
355
356         /* Update current frequency */
357         state->current_frequency = p->frequency;
358         return 0;
359 }
360
361 static int or51132_get_parameters(struct dvb_frontend* fe,
362                                   struct dtv_frontend_properties *p)
363 {
364         struct or51132_state* state = fe->demodulator_priv;
365         int status;
366         int retry = 1;
367
368 start:
369         /* Receiver Status */
370         if ((status = or51132_readreg(state, 0x00)) < 0) {
371                 printk(KERN_WARNING "or51132: get_parameters: error reading receiver status\n");
372                 return -EREMOTEIO;
373         }
374         switch(status&0xff) {
375         case 0x06:
376                 p->modulation = VSB_8;
377                 break;
378         case 0x43:
379                 p->modulation = QAM_64;
380                 break;
381         case 0x45:
382                 p->modulation = QAM_256;
383                 break;
384         default:
385                 if (retry--)
386                         goto start;
387                 printk(KERN_WARNING "or51132: unknown status 0x%02x\n",
388                        status&0xff);
389                 return -EREMOTEIO;
390         }
391
392         /* FIXME: Read frequency from frontend, take AFC into account */
393         p->frequency = state->current_frequency;
394
395         /* FIXME: How to read inversion setting? Receiver 6 register? */
396         p->inversion = INVERSION_AUTO;
397
398         return 0;
399 }
400
401 static int or51132_read_status(struct dvb_frontend *fe, enum fe_status *status)
402 {
403         struct or51132_state* state = fe->demodulator_priv;
404         int reg;
405
406         /* Receiver Status */
407         if ((reg = or51132_readreg(state, 0x00)) < 0) {
408                 printk(KERN_WARNING "or51132: read_status: error reading receiver status: %d\n", reg);
409                 *status = 0;
410                 return -EREMOTEIO;
411         }
412         dprintk("%s: read_status %04x\n", __func__, reg);
413
414         if (reg & 0x0100) /* Receiver Lock */
415                 *status = FE_HAS_SIGNAL|FE_HAS_CARRIER|FE_HAS_VITERBI|
416                           FE_HAS_SYNC|FE_HAS_LOCK;
417         else
418                 *status = 0;
419         return 0;
420 }
421
422 /* Calculate SNR estimation (scaled by 2^24)
423
424    8-VSB SNR and QAM equations from Oren datasheets
425
426    For 8-VSB:
427      SNR[dB] = 10 * log10(897152044.8282 / MSE^2 ) - K
428
429      Where K = 0 if NTSC rejection filter is OFF; and
430            K = 3 if NTSC rejection filter is ON
431
432    For QAM64:
433      SNR[dB] = 10 * log10(897152044.8282 / MSE^2 )
434
435    For QAM256:
436      SNR[dB] = 10 * log10(907832426.314266  / MSE^2 )
437
438    We re-write the snr equation as:
439      SNR * 2^24 = 10*(c - 2*intlog10(MSE))
440    Where for QAM256, c = log10(907832426.314266) * 2^24
441    and for 8-VSB and QAM64, c = log10(897152044.8282) * 2^24 */
442
443 static u32 calculate_snr(u32 mse, u32 c)
444 {
445         if (mse == 0) /* No signal */
446                 return 0;
447
448         mse = 2*intlog10(mse);
449         if (mse > c) {
450                 /* Negative SNR, which is possible, but realisticly the
451                 demod will lose lock before the signal gets this bad.  The
452                 API only allows for unsigned values, so just return 0 */
453                 return 0;
454         }
455         return 10*(c - mse);
456 }
457
458 static int or51132_read_snr(struct dvb_frontend* fe, u16* snr)
459 {
460         struct or51132_state* state = fe->demodulator_priv;
461         int noise, reg;
462         u32 c, usK = 0;
463         int retry = 1;
464
465 start:
466         /* SNR after Equalizer */
467         noise = or51132_readreg(state, 0x02);
468         if (noise < 0) {
469                 printk(KERN_WARNING "or51132: read_snr: error reading equalizer\n");
470                 return -EREMOTEIO;
471         }
472         dprintk("read_snr noise (%d)\n", noise);
473
474         /* Read status, contains modulation type for QAM_AUTO and
475            NTSC filter for VSB */
476         reg = or51132_readreg(state, 0x00);
477         if (reg < 0) {
478                 printk(KERN_WARNING "or51132: read_snr: error reading receiver status\n");
479                 return -EREMOTEIO;
480         }
481
482         switch (reg&0xff) {
483         case 0x06:
484                 if (reg & 0x1000) usK = 3 << 24;
485                 fallthrough;
486         case 0x43: /* QAM64 */
487                 c = 150204167;
488                 break;
489         case 0x45:
490                 c = 150290396;
491                 break;
492         default:
493                 printk(KERN_WARNING "or51132: unknown status 0x%02x\n", reg&0xff);
494                 if (retry--) goto start;
495                 return -EREMOTEIO;
496         }
497         dprintk("%s: modulation %02x, NTSC rej O%s\n", __func__,
498                 reg&0xff, reg&0x1000?"n":"ff");
499
500         /* Calculate SNR using noise, c, and NTSC rejection correction */
501         state->snr = calculate_snr(noise, c) - usK;
502         *snr = (state->snr) >> 16;
503
504         dprintk("%s: noise = 0x%08x, snr = %d.%02d dB\n", __func__, noise,
505                 state->snr >> 24, (((state->snr>>8) & 0xffff) * 100) >> 16);
506
507         return 0;
508 }
509
510 static int or51132_read_signal_strength(struct dvb_frontend* fe, u16* strength)
511 {
512         /* Calculate Strength from SNR up to 35dB */
513         /* Even though the SNR can go higher than 35dB, there is some comfort */
514         /* factor in having a range of strong signals that can show at 100%   */
515         struct or51132_state* state = (struct or51132_state*) fe->demodulator_priv;
516         u16 snr;
517         int ret;
518
519         ret = fe->ops.read_snr(fe, &snr);
520         if (ret != 0)
521                 return ret;
522         /* Rather than use the 8.8 value snr, use state->snr which is 8.24 */
523         /* scale the range 0 - 35*2^24 into 0 - 65535 */
524         if (state->snr >= 8960 * 0x10000)
525                 *strength = 0xffff;
526         else
527                 *strength = state->snr / 8960;
528
529         return 0;
530 }
531
532 static int or51132_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings* fe_tune_settings)
533 {
534         fe_tune_settings->min_delay_ms = 500;
535         fe_tune_settings->step_size = 0;
536         fe_tune_settings->max_drift = 0;
537
538         return 0;
539 }
540
541 static void or51132_release(struct dvb_frontend* fe)
542 {
543         struct or51132_state* state = fe->demodulator_priv;
544         kfree(state);
545 }
546
547 static const struct dvb_frontend_ops or51132_ops;
548
549 struct dvb_frontend* or51132_attach(const struct or51132_config* config,
550                                     struct i2c_adapter* i2c)
551 {
552         struct or51132_state* state = NULL;
553
554         /* Allocate memory for the internal state */
555         state = kzalloc(sizeof(struct or51132_state), GFP_KERNEL);
556         if (state == NULL)
557                 return NULL;
558
559         /* Setup the state */
560         state->config = config;
561         state->i2c = i2c;
562         state->current_frequency = -1;
563         state->current_modulation = -1;
564
565         /* Create dvb_frontend */
566         memcpy(&state->frontend.ops, &or51132_ops, sizeof(struct dvb_frontend_ops));
567         state->frontend.demodulator_priv = state;
568         return &state->frontend;
569 }
570
571 static const struct dvb_frontend_ops or51132_ops = {
572         .delsys = { SYS_ATSC, SYS_DVBC_ANNEX_B },
573         .info = {
574                 .name                   = "Oren OR51132 VSB/QAM Frontend",
575                 .frequency_min_hz       =  44 * MHz,
576                 .frequency_max_hz       = 958 * MHz,
577                 .frequency_stepsize_hz  = 166666,
578                 .caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
579                         FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
580                         FE_CAN_QAM_64 | FE_CAN_QAM_256 | FE_CAN_QAM_AUTO |
581                         FE_CAN_8VSB
582         },
583
584         .release = or51132_release,
585
586         .init = or51132_init,
587         .sleep = or51132_sleep,
588
589         .set_frontend = or51132_set_parameters,
590         .get_frontend = or51132_get_parameters,
591         .get_tune_settings = or51132_get_tune_settings,
592
593         .read_status = or51132_read_status,
594         .read_ber = or51132_read_ber,
595         .read_signal_strength = or51132_read_signal_strength,
596         .read_snr = or51132_read_snr,
597         .read_ucblocks = or51132_read_ucblocks,
598 };
599
600 module_param(debug, int, 0644);
601 MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
602
603 MODULE_DESCRIPTION("OR51132 ATSC [pcHDTV HD-3000] (8VSB & ITU J83 AnnexB FEC QAM64/256) Demodulator Driver");
604 MODULE_AUTHOR("Kirk Lapray");
605 MODULE_AUTHOR("Trent Piepho");
606 MODULE_LICENSE("GPL");
607
608 EXPORT_SYMBOL_GPL(or51132_attach);