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1/*
2 * drivers/mfd/si476x-i2c.c -- Core device driver for si476x MFD
3 * device
4 *
5 * Copyright (C) 2012 Innovative Converged Devices(ICD)
6 * Copyright (C) 2013 Andrey Smirnov
7 *
8 * Author: Andrey Smirnov <andrew.smirnov@gmail.com>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; version 2 of the License.
13 *
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
18 *
19 */
20#include <linux/module.h>
21
22#include <linux/slab.h>
23#include <linux/interrupt.h>
24#include <linux/delay.h>
25#include <linux/gpio.h>
26#include <linux/regulator/consumer.h>
27#include <linux/i2c.h>
28#include <linux/err.h>
29
30#include <linux/mfd/si476x-core.h>
31
32#define SI476X_MAX_IO_ERRORS 10
33#define SI476X_DRIVER_RDS_FIFO_DEPTH 128
34
35/**
36 * si476x_core_config_pinmux() - pin function configuration function
37 *
38 * @core: Core device structure
39 *
40 * Configure the functions of the pins of the radio chip.
41 *
42 * The function returns zero in case of succes or negative error code
43 * otherwise.
44 */
45static int si476x_core_config_pinmux(struct si476x_core *core)
46{
47 int err;
48 dev_dbg(&core->client->dev, "Configuring pinmux\n");
49 err = si476x_core_cmd_dig_audio_pin_cfg(core,
50 core->pinmux.dclk,
51 core->pinmux.dfs,
52 core->pinmux.dout,
53 core->pinmux.xout);
54 if (err < 0) {
55 dev_err(&core->client->dev,
56 "Failed to configure digital audio pins(err = %d)\n",
57 err);
58 return err;
59 }
60
61 err = si476x_core_cmd_zif_pin_cfg(core,
62 core->pinmux.iqclk,
63 core->pinmux.iqfs,
64 core->pinmux.iout,
65 core->pinmux.qout);
66 if (err < 0) {
67 dev_err(&core->client->dev,
68 "Failed to configure ZIF pins(err = %d)\n",
69 err);
70 return err;
71 }
72
73 err = si476x_core_cmd_ic_link_gpo_ctl_pin_cfg(core,
74 core->pinmux.icin,
75 core->pinmux.icip,
76 core->pinmux.icon,
77 core->pinmux.icop);
78 if (err < 0) {
79 dev_err(&core->client->dev,
80 "Failed to configure IC-Link/GPO pins(err = %d)\n",
81 err);
82 return err;
83 }
84
85 err = si476x_core_cmd_ana_audio_pin_cfg(core,
86 core->pinmux.lrout);
87 if (err < 0) {
88 dev_err(&core->client->dev,
89 "Failed to configure analog audio pins(err = %d)\n",
90 err);
91 return err;
92 }
93
94 err = si476x_core_cmd_intb_pin_cfg(core,
95 core->pinmux.intb,
96 core->pinmux.a1);
97 if (err < 0) {
98 dev_err(&core->client->dev,
99 "Failed to configure interrupt pins(err = %d)\n",
100 err);
101 return err;
102 }
103
104 return 0;
105}
106
107static inline void si476x_core_schedule_polling_work(struct si476x_core *core)
108{
109 schedule_delayed_work(&core->status_monitor,
110 usecs_to_jiffies(SI476X_STATUS_POLL_US));
111}
112
113/**
114 * si476x_core_start() - early chip startup function
115 * @core: Core device structure
116 * @soft: When set, this flag forces "soft" startup, where "soft"
117 * power down is the one done by sending appropriate command instead
118 * of using reset pin of the tuner
119 *
120 * Perform required startup sequence to correctly power
121 * up the chip and perform initial configuration. It does the
122 * following sequence of actions:
123 * 1. Claims and enables the power supplies VD and VIO1 required
124 * for I2C interface of the chip operation.
125 * 2. Waits for 100us, pulls the reset line up, enables irq,
126 * waits for another 100us as it is specified by the
127 * datasheet.
128 * 3. Sends 'POWER_UP' command to the device with all provided
129 * information about power-up parameters.
130 * 4. Configures, pin multiplexor, disables digital audio and
131 * configures interrupt sources.
132 *
133 * The function returns zero in case of succes or negative error code
134 * otherwise.
135 */
136int si476x_core_start(struct si476x_core *core, bool soft)
137{
138 struct i2c_client *client = core->client;
139 int err;
140
141 if (!soft) {
142 if (gpio_is_valid(core->gpio_reset))
143 gpio_set_value_cansleep(core->gpio_reset, 1);
144
145 if (client->irq)
146 enable_irq(client->irq);
147
148 udelay(100);
149
150 if (!client->irq) {
151 atomic_set(&core->is_alive, 1);
152 si476x_core_schedule_polling_work(core);
153 }
154 } else {
155 if (client->irq)
156 enable_irq(client->irq);
157 else {
158 atomic_set(&core->is_alive, 1);
159 si476x_core_schedule_polling_work(core);
160 }
161 }
162
163 err = si476x_core_cmd_power_up(core,
164 &core->power_up_parameters);
165
166 if (err < 0) {
167 dev_err(&core->client->dev,
168 "Power up failure(err = %d)\n",
169 err);
170 goto disable_irq;
171 }
172
173 if (client->irq)
174 atomic_set(&core->is_alive, 1);
175
176 err = si476x_core_config_pinmux(core);
177 if (err < 0) {
178 dev_err(&core->client->dev,
179 "Failed to configure pinmux(err = %d)\n",
180 err);
181 goto disable_irq;
182 }
183
184 if (client->irq) {
185 err = regmap_write(core->regmap,
186 SI476X_PROP_INT_CTL_ENABLE,
187 SI476X_RDSIEN |
188 SI476X_STCIEN |
189 SI476X_CTSIEN);
190 if (err < 0) {
191 dev_err(&core->client->dev,
192 "Failed to configure interrupt sources"
193 "(err = %d)\n", err);
194 goto disable_irq;
195 }
196 }
197
198 return 0;
199
200disable_irq:
201 if (err == -ENODEV)
202 atomic_set(&core->is_alive, 0);
203
204 if (client->irq)
205 disable_irq(client->irq);
206 else
207 cancel_delayed_work_sync(&core->status_monitor);
208
209 if (gpio_is_valid(core->gpio_reset))
210 gpio_set_value_cansleep(core->gpio_reset, 0);
211
212 return err;
213}
214EXPORT_SYMBOL_GPL(si476x_core_start);
215
216/**
217 * si476x_core_stop() - chip power-down function
218 * @core: Core device structure
219 * @soft: When set, function sends a POWER_DOWN command instead of
220 * bringing reset line low
221 *
222 * Power down the chip by performing following actions:
223 * 1. Disable IRQ or stop the polling worker
224 * 2. Send the POWER_DOWN command if the power down is soft or bring
225 * reset line low if not.
226 *
227 * The function returns zero in case of succes or negative error code
228 * otherwise.
229 */
230int si476x_core_stop(struct si476x_core *core, bool soft)
231{
232 int err = 0;
233 atomic_set(&core->is_alive, 0);
234
235 if (soft) {
236 /* TODO: This probably shoud be a configurable option,
237 * so it is possible to have the chips keep their
238 * oscillators running
239 */
240 struct si476x_power_down_args args = {
241 .xosc = false,
242 };
243 err = si476x_core_cmd_power_down(core, &args);
244 }
245
246 /* We couldn't disable those before
247 * 'si476x_core_cmd_power_down' since we expect to get CTS
248 * interrupt */
249 if (core->client->irq)
250 disable_irq(core->client->irq);
251 else
252 cancel_delayed_work_sync(&core->status_monitor);
253
254 if (!soft) {
255 if (gpio_is_valid(core->gpio_reset))
256 gpio_set_value_cansleep(core->gpio_reset, 0);
257 }
258 return err;
259}
260EXPORT_SYMBOL_GPL(si476x_core_stop);
261
262/**
263 * si476x_core_set_power_state() - set the level at which the power is
264 * supplied for the chip.
265 * @core: Core device structure
266 * @next_state: enum si476x_power_state describing power state to
267 * switch to.
268 *
269 * Switch on all the required power supplies
270 *
271 * This function returns 0 in case of suvccess and negative error code
272 * otherwise.
273 */
274int si476x_core_set_power_state(struct si476x_core *core,
275 enum si476x_power_state next_state)
276{
277 /*
278 It is not clear form the datasheet if it is possible to
279 work with device if not all power domains are operational.
280 So for now the power-up policy is "power-up all the things!"
281 */
282 int err = 0;
283
284 if (core->power_state == SI476X_POWER_INCONSISTENT) {
285 dev_err(&core->client->dev,
286 "The device in inconsistent power state\n");
287 return -EINVAL;
288 }
289
290 if (next_state != core->power_state) {
291 switch (next_state) {
292 case SI476X_POWER_UP_FULL:
293 err = regulator_bulk_enable(ARRAY_SIZE(core->supplies),
294 core->supplies);
295 if (err < 0) {
296 core->power_state = SI476X_POWER_INCONSISTENT;
297 break;
298 }
299 /*
300 * Startup timing diagram recommends to have a
301 * 100 us delay between enabling of the power
302 * supplies and turning the tuner on.
303 */
304 udelay(100);
305
306 err = si476x_core_start(core, false);
307 if (err < 0)
308 goto disable_regulators;
309
310 core->power_state = next_state;
311 break;
312
313 case SI476X_POWER_DOWN:
314 core->power_state = next_state;
315 err = si476x_core_stop(core, false);
316 if (err < 0)
317 core->power_state = SI476X_POWER_INCONSISTENT;
318disable_regulators:
319 err = regulator_bulk_disable(ARRAY_SIZE(core->supplies),
320 core->supplies);
321 if (err < 0)
322 core->power_state = SI476X_POWER_INCONSISTENT;
323 break;
324 default:
325 BUG();
326 }
327 }
328
329 return err;
330}
331EXPORT_SYMBOL_GPL(si476x_core_set_power_state);
332
333/**
334 * si476x_core_report_drainer_stop() - mark the completion of the RDS
335 * buffer drain porcess by the worker.
336 *
337 * @core: Core device structure
338 */
339static inline void si476x_core_report_drainer_stop(struct si476x_core *core)
340{
341 mutex_lock(&core->rds_drainer_status_lock);
342 core->rds_drainer_is_working = false;
343 mutex_unlock(&core->rds_drainer_status_lock);
344}
345
346/**
347 * si476x_core_start_rds_drainer_once() - start RDS drainer worker if
348 * ther is none working, do nothing otherwise
349 *
350 * @core: Datastructure corresponding to the chip.
351 */
352static inline void si476x_core_start_rds_drainer_once(struct si476x_core *core)
353{
354 mutex_lock(&core->rds_drainer_status_lock);
355 if (!core->rds_drainer_is_working) {
356 core->rds_drainer_is_working = true;
357 schedule_work(&core->rds_fifo_drainer);
358 }
359 mutex_unlock(&core->rds_drainer_status_lock);
360}
361/**
362 * si476x_drain_rds_fifo() - RDS buffer drainer.
363 * @work: struct work_struct being ppassed to the function by the
364 * kernel.
365 *
366 * Drain the contents of the RDS FIFO of
367 */
368static void si476x_core_drain_rds_fifo(struct work_struct *work)
369{
370 int err;
371
372 struct si476x_core *core = container_of(work, struct si476x_core,
373 rds_fifo_drainer);
374
375 struct si476x_rds_status_report report;
376
377 si476x_core_lock(core);
378 err = si476x_core_cmd_fm_rds_status(core, true, false, false, &report);
379 if (!err) {
380 int i = report.rdsfifoused;
381 dev_dbg(&core->client->dev,
382 "%d elements in RDS FIFO. Draining.\n", i);
383 for (; i > 0; --i) {
384 err = si476x_core_cmd_fm_rds_status(core, false, false,
385 (i == 1), &report);
386 if (err < 0)
387 goto unlock;
388
389 kfifo_in(&core->rds_fifo, report.rds,
390 sizeof(report.rds));
391 dev_dbg(&core->client->dev, "RDS data:\n %*ph\n",
392 (int)sizeof(report.rds), report.rds);
393 }
394 dev_dbg(&core->client->dev, "Drrrrained!\n");
395 wake_up_interruptible(&core->rds_read_queue);
396 }
397
398unlock:
399 si476x_core_unlock(core);
400 si476x_core_report_drainer_stop(core);
401}
402
403/**
404 * si476x_core_pronounce_dead()
405 *
406 * @core: Core device structure
407 *
408 * Mark the device as being dead and wake up all potentially waiting
409 * threads of execution.
410 *
411 */
412static void si476x_core_pronounce_dead(struct si476x_core *core)
413{
414 dev_info(&core->client->dev, "Core device is dead.\n");
415
416 atomic_set(&core->is_alive, 0);
417
418 /* Wake up al possible waiting processes */
419 wake_up_interruptible(&core->rds_read_queue);
420
421 atomic_set(&core->cts, 1);
422 wake_up(&core->command);
423
424 atomic_set(&core->stc, 1);
425 wake_up(&core->tuning);
426}
427
428/**
429 * si476x_core_i2c_xfer()
430 *
431 * @core: Core device structure
432 * @type: Transfer type
433 * @buf: Transfer buffer for/with data
434 * @count: Transfer buffer size
435 *
436 * Perfrom and I2C transfer(either read or write) and keep a counter
437 * of I/O errors. If the error counter rises above the threshold
438 * pronounce device dead.
439 *
440 * The function returns zero on succes or negative error code on
441 * failure.
442 */
443int si476x_core_i2c_xfer(struct si476x_core *core,
444 enum si476x_i2c_type type,
445 char *buf, int count)
446{
447 static int io_errors_count;
448 int err;
449 if (type == SI476X_I2C_SEND)
450 err = i2c_master_send(core->client, buf, count);
451 else
452 err = i2c_master_recv(core->client, buf, count);
453
454 if (err < 0) {
455 if (io_errors_count++ > SI476X_MAX_IO_ERRORS)
456 si476x_core_pronounce_dead(core);
457 } else {
458 io_errors_count = 0;
459 }
460
461 return err;
462}
463EXPORT_SYMBOL_GPL(si476x_core_i2c_xfer);
464
465/**
466 * si476x_get_status()
467 * @core: Core device structure
468 *
469 * Get the status byte of the core device by berforming one byte I2C
470 * read.
471 *
472 * The function returns a status value or a negative error code on
473 * error.
474 */
475static int si476x_core_get_status(struct si476x_core *core)
476{
477 u8 response;
478 int err = si476x_core_i2c_xfer(core, SI476X_I2C_RECV,
479 &response, sizeof(response));
480
481 return (err < 0) ? err : response;
482}
483
484/**
485 * si476x_get_and_signal_status() - IRQ dispatcher
486 * @core: Core device structure
487 *
488 * Dispatch the arrived interrupt request based on the value of the
489 * status byte reported by the tuner.
490 *
491 */
492static void si476x_core_get_and_signal_status(struct si476x_core *core)
493{
494 int status = si476x_core_get_status(core);
495 if (status < 0) {
496 dev_err(&core->client->dev, "Failed to get status\n");
497 return;
498 }
499
500 if (status & SI476X_CTS) {
501 /* Unfortunately completions could not be used for
502 * signalling CTS since this flag cannot be cleared
503 * in status byte, and therefore once it becomes true
504 * multiple calls to 'complete' would cause the
505 * commands following the current one to be completed
506 * before they actually are */
507 dev_dbg(&core->client->dev, "[interrupt] CTSINT\n");
508 atomic_set(&core->cts, 1);
509 wake_up(&core->command);
510 }
511
512 if (status & SI476X_FM_RDS_INT) {
513 dev_dbg(&core->client->dev, "[interrupt] RDSINT\n");
514 si476x_core_start_rds_drainer_once(core);
515 }
516
517 if (status & SI476X_STC_INT) {
518 dev_dbg(&core->client->dev, "[interrupt] STCINT\n");
519 atomic_set(&core->stc, 1);
520 wake_up(&core->tuning);
521 }
522}
523
524static void si476x_core_poll_loop(struct work_struct *work)
525{
526 struct si476x_core *core = SI476X_WORK_TO_CORE(work);
527
528 si476x_core_get_and_signal_status(core);
529
530 if (atomic_read(&core->is_alive))
531 si476x_core_schedule_polling_work(core);
532}
533
534static irqreturn_t si476x_core_interrupt(int irq, void *dev)
535{
536 struct si476x_core *core = dev;
537
538 si476x_core_get_and_signal_status(core);
539
540 return IRQ_HANDLED;
541}
542
543/**
544 * si476x_firmware_version_to_revision()
545 * @core: Core device structure
546 * @major: Firmware major number
547 * @minor1: Firmware first minor number
548 * @minor2: Firmware second minor number
549 *
550 * Convert a chip's firmware version number into an offset that later
551 * will be used to as offset in "vtable" of tuner functions
552 *
553 * This function returns a positive offset in case of success and a -1
554 * in case of failure.
555 */
556static int si476x_core_fwver_to_revision(struct si476x_core *core,
557 int func, int major,
558 int minor1, int minor2)
559{
560 switch (func) {
561 case SI476X_FUNC_FM_RECEIVER:
562 switch (major) {
563 case 5:
564 return SI476X_REVISION_A10;
565 case 8:
566 return SI476X_REVISION_A20;
567 case 10:
568 return SI476X_REVISION_A30;
569 default:
570 goto unknown_revision;
571 }
572 case SI476X_FUNC_AM_RECEIVER:
573 switch (major) {
574 case 5:
575 return SI476X_REVISION_A10;
576 case 7:
577 return SI476X_REVISION_A20;
578 case 9:
579 return SI476X_REVISION_A30;
580 default:
581 goto unknown_revision;
582 }
583 case SI476X_FUNC_WB_RECEIVER:
584 switch (major) {
585 case 3:
586 return SI476X_REVISION_A10;
587 case 5:
588 return SI476X_REVISION_A20;
589 case 7:
590 return SI476X_REVISION_A30;
591 default:
592 goto unknown_revision;
593 }
594 case SI476X_FUNC_BOOTLOADER:
595 default: /* FALLTHROUG */
596 BUG();
597 return -1;
598 }
599
600unknown_revision:
601 dev_err(&core->client->dev,
602 "Unsupported version of the firmware: %d.%d.%d, "
603 "reverting to A10 comptible functions\n",
604 major, minor1, minor2);
605
606 return SI476X_REVISION_A10;
607}
608
609/**
610 * si476x_get_revision_info()
611 * @core: Core device structure
612 *
613 * Get the firmware version number of the device. It is done in
614 * following three steps:
615 * 1. Power-up the device
616 * 2. Send the 'FUNC_INFO' command
617 * 3. Powering the device down.
618 *
619 * The function return zero on success and a negative error code on
620 * failure.
621 */
622static int si476x_core_get_revision_info(struct si476x_core *core)
623{
624 int rval;
625 struct si476x_func_info info;
626
627 si476x_core_lock(core);
628 rval = si476x_core_set_power_state(core, SI476X_POWER_UP_FULL);
629 if (rval < 0)
630 goto exit;
631
632 rval = si476x_core_cmd_func_info(core, &info);
633 if (rval < 0)
634 goto power_down;
635
636 core->revision = si476x_core_fwver_to_revision(core, info.func,
637 info.firmware.major,
638 info.firmware.minor[0],
639 info.firmware.minor[1]);
640power_down:
641 si476x_core_set_power_state(core, SI476X_POWER_DOWN);
642exit:
643 si476x_core_unlock(core);
644
645 return rval;
646}
647
648bool si476x_core_has_am(struct si476x_core *core)
649{
650 return core->chip_id == SI476X_CHIP_SI4761 ||
651 core->chip_id == SI476X_CHIP_SI4764;
652}
653EXPORT_SYMBOL_GPL(si476x_core_has_am);
654
655bool si476x_core_has_diversity(struct si476x_core *core)
656{
657 return core->chip_id == SI476X_CHIP_SI4764;
658}
659EXPORT_SYMBOL_GPL(si476x_core_has_diversity);
660
661bool si476x_core_is_a_secondary_tuner(struct si476x_core *core)
662{
663 return si476x_core_has_diversity(core) &&
664 (core->diversity_mode == SI476X_PHDIV_SECONDARY_ANTENNA ||
665 core->diversity_mode == SI476X_PHDIV_SECONDARY_COMBINING);
666}
667EXPORT_SYMBOL_GPL(si476x_core_is_a_secondary_tuner);
668
669bool si476x_core_is_a_primary_tuner(struct si476x_core *core)
670{
671 return si476x_core_has_diversity(core) &&
672 (core->diversity_mode == SI476X_PHDIV_PRIMARY_ANTENNA ||
673 core->diversity_mode == SI476X_PHDIV_PRIMARY_COMBINING);
674}
675EXPORT_SYMBOL_GPL(si476x_core_is_a_primary_tuner);
676
677bool si476x_core_is_in_am_receiver_mode(struct si476x_core *core)
678{
679 return si476x_core_has_am(core) &&
680 (core->power_up_parameters.func == SI476X_FUNC_AM_RECEIVER);
681}
682EXPORT_SYMBOL_GPL(si476x_core_is_in_am_receiver_mode);
683
684bool si476x_core_is_powered_up(struct si476x_core *core)
685{
686 return core->power_state == SI476X_POWER_UP_FULL;
687}
688EXPORT_SYMBOL_GPL(si476x_core_is_powered_up);
689
690static int si476x_core_probe(struct i2c_client *client,
691 const struct i2c_device_id *id)
692{
693 int rval;
694 struct si476x_core *core;
695 struct si476x_platform_data *pdata;
696 struct mfd_cell *cell;
697 int cell_num;
698
699 core = devm_kzalloc(&client->dev, sizeof(*core), GFP_KERNEL);
700 if (!core) {
701 dev_err(&client->dev,
702 "failed to allocate 'struct si476x_core'\n");
703 return -ENOMEM;
704 }
705 core->client = client;
706
707 core->regmap = devm_regmap_init_si476x(core);
708 if (IS_ERR(core->regmap)) {
709 rval = PTR_ERR(core->regmap);
710 dev_err(&client->dev,
711 "Failed to allocate register map: %d\n",
712 rval);
713 return rval;
714 }
715
716 i2c_set_clientdata(client, core);
717
718 atomic_set(&core->is_alive, 0);
719 core->power_state = SI476X_POWER_DOWN;
720
721 pdata = dev_get_platdata(&client->dev);
722 if (pdata) {
723 memcpy(&core->power_up_parameters,
724 &pdata->power_up_parameters,
725 sizeof(core->power_up_parameters));
726
727 core->gpio_reset = -1;
728 if (gpio_is_valid(pdata->gpio_reset)) {
729 rval = gpio_request(pdata->gpio_reset, "si476x reset");
730 if (rval) {
731 dev_err(&client->dev,
732 "Failed to request gpio: %d\n", rval);
733 return rval;
734 }
735 core->gpio_reset = pdata->gpio_reset;
736 gpio_direction_output(core->gpio_reset, 0);
737 }
738
739 core->diversity_mode = pdata->diversity_mode;
740 memcpy(&core->pinmux, &pdata->pinmux,
741 sizeof(struct si476x_pinmux));
742 } else {
743 dev_err(&client->dev, "No platform data provided\n");
744 return -EINVAL;
745 }
746
747 core->supplies[0].supply = "vd";
748 core->supplies[1].supply = "va";
749 core->supplies[2].supply = "vio1";
750 core->supplies[3].supply = "vio2";
751
752 rval = devm_regulator_bulk_get(&client->dev,
753 ARRAY_SIZE(core->supplies),
754 core->supplies);
755 if (rval) {
756 dev_err(&client->dev, "Failet to gett all of the regulators\n");
757 goto free_gpio;
758 }
759
760 mutex_init(&core->cmd_lock);
761 init_waitqueue_head(&core->command);
762 init_waitqueue_head(&core->tuning);
763
764 rval = kfifo_alloc(&core->rds_fifo,
765 SI476X_DRIVER_RDS_FIFO_DEPTH *
766 sizeof(struct v4l2_rds_data),
767 GFP_KERNEL);
768 if (rval) {
769 dev_err(&client->dev, "Could not allocate the FIFO\n");
770 goto free_gpio;
771 }
772 mutex_init(&core->rds_drainer_status_lock);
773 init_waitqueue_head(&core->rds_read_queue);
774 INIT_WORK(&core->rds_fifo_drainer, si476x_core_drain_rds_fifo);
775
776 if (client->irq) {
777 rval = devm_request_threaded_irq(&client->dev,
778 client->irq, NULL,
779 si476x_core_interrupt,
780 IRQF_TRIGGER_FALLING |
781 IRQF_ONESHOT,
782 client->name, core);
783 if (rval < 0) {
784 dev_err(&client->dev, "Could not request IRQ %d\n",
785 client->irq);
786 goto free_kfifo;
787 }
788 disable_irq(client->irq);
789 dev_dbg(&client->dev, "IRQ requested.\n");
790
791 core->rds_fifo_depth = 20;
792 } else {
793 INIT_DELAYED_WORK(&core->status_monitor,
794 si476x_core_poll_loop);
795 dev_info(&client->dev,
796 "No IRQ number specified, will use polling\n");
797
798 core->rds_fifo_depth = 5;
799 }
800
801 core->chip_id = id->driver_data;
802
803 rval = si476x_core_get_revision_info(core);
804 if (rval < 0) {
805 rval = -ENODEV;
806 goto free_kfifo;
807 }
808
809 cell_num = 0;
810
811 cell = &core->cells[SI476X_RADIO_CELL];
812 cell->name = "si476x-radio";
813 cell_num++;
814
815#ifdef CONFIG_SND_SOC_SI476X
816 if ((core->chip_id == SI476X_CHIP_SI4761 ||
817 core->chip_id == SI476X_CHIP_SI4764) &&
818 core->pinmux.dclk == SI476X_DCLK_DAUDIO &&
819 core->pinmux.dfs == SI476X_DFS_DAUDIO &&
820 core->pinmux.dout == SI476X_DOUT_I2S_OUTPUT &&
821 core->pinmux.xout == SI476X_XOUT_TRISTATE) {
822 cell = &core->cells[SI476X_CODEC_CELL];
823 cell->name = "si476x-codec";
824 cell_num++;
825 }
826#endif
827 rval = mfd_add_devices(&client->dev,
828 (client->adapter->nr << 8) + client->addr,
829 core->cells, cell_num,
830 NULL, 0, NULL);
831 if (!rval)
832 return 0;
833
834free_kfifo:
835 kfifo_free(&core->rds_fifo);
836
837free_gpio:
838 if (gpio_is_valid(core->gpio_reset))
839 gpio_free(core->gpio_reset);
840
841 return rval;
842}
843
844static int si476x_core_remove(struct i2c_client *client)
845{
846 struct si476x_core *core = i2c_get_clientdata(client);
847
848 si476x_core_pronounce_dead(core);
849 mfd_remove_devices(&client->dev);
850
851 if (client->irq)
852 disable_irq(client->irq);
853 else
854 cancel_delayed_work_sync(&core->status_monitor);
855
856 kfifo_free(&core->rds_fifo);
857
858 if (gpio_is_valid(core->gpio_reset))
859 gpio_free(core->gpio_reset);
860
861 return 0;
862}
863
864
865static const struct i2c_device_id si476x_id[] = {
866 { "si4761", SI476X_CHIP_SI4761 },
867 { "si4764", SI476X_CHIP_SI4764 },
868 { "si4768", SI476X_CHIP_SI4768 },
869 { },
870};
871MODULE_DEVICE_TABLE(i2c, si476x_id);
872
873static struct i2c_driver si476x_core_driver = {
874 .driver = {
875 .name = "si476x-core",
876 },
877 .probe = si476x_core_probe,
878 .remove = si476x_core_remove,
879 .id_table = si476x_id,
880};
881module_i2c_driver(si476x_core_driver);
882
883
884MODULE_AUTHOR("Andrey Smirnov <andrew.smirnov@gmail.com>");
885MODULE_DESCRIPTION("Si4761/64/68 AM/FM MFD core device driver");
886MODULE_LICENSE("GPL");
1/*
2 * drivers/mfd/si476x-i2c.c -- Core device driver for si476x MFD
3 * device
4 *
5 * Copyright (C) 2012 Innovative Converged Devices(ICD)
6 * Copyright (C) 2013 Andrey Smirnov
7 *
8 * Author: Andrey Smirnov <andrew.smirnov@gmail.com>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; version 2 of the License.
13 *
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
18 *
19 */
20#include <linux/module.h>
21
22#include <linux/slab.h>
23#include <linux/interrupt.h>
24#include <linux/delay.h>
25#include <linux/gpio.h>
26#include <linux/regulator/consumer.h>
27#include <linux/i2c.h>
28#include <linux/err.h>
29
30#include <linux/mfd/si476x-core.h>
31
32#define SI476X_MAX_IO_ERRORS 10
33#define SI476X_DRIVER_RDS_FIFO_DEPTH 128
34
35/**
36 * si476x_core_config_pinmux() - pin function configuration function
37 *
38 * @core: Core device structure
39 *
40 * Configure the functions of the pins of the radio chip.
41 *
42 * The function returns zero in case of succes or negative error code
43 * otherwise.
44 */
45static int si476x_core_config_pinmux(struct si476x_core *core)
46{
47 int err;
48 dev_dbg(&core->client->dev, "Configuring pinmux\n");
49 err = si476x_core_cmd_dig_audio_pin_cfg(core,
50 core->pinmux.dclk,
51 core->pinmux.dfs,
52 core->pinmux.dout,
53 core->pinmux.xout);
54 if (err < 0) {
55 dev_err(&core->client->dev,
56 "Failed to configure digital audio pins(err = %d)\n",
57 err);
58 return err;
59 }
60
61 err = si476x_core_cmd_zif_pin_cfg(core,
62 core->pinmux.iqclk,
63 core->pinmux.iqfs,
64 core->pinmux.iout,
65 core->pinmux.qout);
66 if (err < 0) {
67 dev_err(&core->client->dev,
68 "Failed to configure ZIF pins(err = %d)\n",
69 err);
70 return err;
71 }
72
73 err = si476x_core_cmd_ic_link_gpo_ctl_pin_cfg(core,
74 core->pinmux.icin,
75 core->pinmux.icip,
76 core->pinmux.icon,
77 core->pinmux.icop);
78 if (err < 0) {
79 dev_err(&core->client->dev,
80 "Failed to configure IC-Link/GPO pins(err = %d)\n",
81 err);
82 return err;
83 }
84
85 err = si476x_core_cmd_ana_audio_pin_cfg(core,
86 core->pinmux.lrout);
87 if (err < 0) {
88 dev_err(&core->client->dev,
89 "Failed to configure analog audio pins(err = %d)\n",
90 err);
91 return err;
92 }
93
94 err = si476x_core_cmd_intb_pin_cfg(core,
95 core->pinmux.intb,
96 core->pinmux.a1);
97 if (err < 0) {
98 dev_err(&core->client->dev,
99 "Failed to configure interrupt pins(err = %d)\n",
100 err);
101 return err;
102 }
103
104 return 0;
105}
106
107static inline void si476x_core_schedule_polling_work(struct si476x_core *core)
108{
109 schedule_delayed_work(&core->status_monitor,
110 usecs_to_jiffies(SI476X_STATUS_POLL_US));
111}
112
113/**
114 * si476x_core_start() - early chip startup function
115 * @core: Core device structure
116 * @soft: When set, this flag forces "soft" startup, where "soft"
117 * power down is the one done by sending appropriate command instead
118 * of using reset pin of the tuner
119 *
120 * Perform required startup sequence to correctly power
121 * up the chip and perform initial configuration. It does the
122 * following sequence of actions:
123 * 1. Claims and enables the power supplies VD and VIO1 required
124 * for I2C interface of the chip operation.
125 * 2. Waits for 100us, pulls the reset line up, enables irq,
126 * waits for another 100us as it is specified by the
127 * datasheet.
128 * 3. Sends 'POWER_UP' command to the device with all provided
129 * information about power-up parameters.
130 * 4. Configures, pin multiplexor, disables digital audio and
131 * configures interrupt sources.
132 *
133 * The function returns zero in case of succes or negative error code
134 * otherwise.
135 */
136int si476x_core_start(struct si476x_core *core, bool soft)
137{
138 struct i2c_client *client = core->client;
139 int err;
140
141 if (!soft) {
142 if (gpio_is_valid(core->gpio_reset))
143 gpio_set_value_cansleep(core->gpio_reset, 1);
144
145 if (client->irq)
146 enable_irq(client->irq);
147
148 udelay(100);
149
150 if (!client->irq) {
151 atomic_set(&core->is_alive, 1);
152 si476x_core_schedule_polling_work(core);
153 }
154 } else {
155 if (client->irq)
156 enable_irq(client->irq);
157 else {
158 atomic_set(&core->is_alive, 1);
159 si476x_core_schedule_polling_work(core);
160 }
161 }
162
163 err = si476x_core_cmd_power_up(core,
164 &core->power_up_parameters);
165
166 if (err < 0) {
167 dev_err(&core->client->dev,
168 "Power up failure(err = %d)\n",
169 err);
170 goto disable_irq;
171 }
172
173 if (client->irq)
174 atomic_set(&core->is_alive, 1);
175
176 err = si476x_core_config_pinmux(core);
177 if (err < 0) {
178 dev_err(&core->client->dev,
179 "Failed to configure pinmux(err = %d)\n",
180 err);
181 goto disable_irq;
182 }
183
184 if (client->irq) {
185 err = regmap_write(core->regmap,
186 SI476X_PROP_INT_CTL_ENABLE,
187 SI476X_RDSIEN |
188 SI476X_STCIEN |
189 SI476X_CTSIEN);
190 if (err < 0) {
191 dev_err(&core->client->dev,
192 "Failed to configure interrupt sources"
193 "(err = %d)\n", err);
194 goto disable_irq;
195 }
196 }
197
198 return 0;
199
200disable_irq:
201 if (err == -ENODEV)
202 atomic_set(&core->is_alive, 0);
203
204 if (client->irq)
205 disable_irq(client->irq);
206 else
207 cancel_delayed_work_sync(&core->status_monitor);
208
209 if (gpio_is_valid(core->gpio_reset))
210 gpio_set_value_cansleep(core->gpio_reset, 0);
211
212 return err;
213}
214EXPORT_SYMBOL_GPL(si476x_core_start);
215
216/**
217 * si476x_core_stop() - chip power-down function
218 * @core: Core device structure
219 * @soft: When set, function sends a POWER_DOWN command instead of
220 * bringing reset line low
221 *
222 * Power down the chip by performing following actions:
223 * 1. Disable IRQ or stop the polling worker
224 * 2. Send the POWER_DOWN command if the power down is soft or bring
225 * reset line low if not.
226 *
227 * The function returns zero in case of succes or negative error code
228 * otherwise.
229 */
230int si476x_core_stop(struct si476x_core *core, bool soft)
231{
232 int err = 0;
233 atomic_set(&core->is_alive, 0);
234
235 if (soft) {
236 /* TODO: This probably shoud be a configurable option,
237 * so it is possible to have the chips keep their
238 * oscillators running
239 */
240 struct si476x_power_down_args args = {
241 .xosc = false,
242 };
243 err = si476x_core_cmd_power_down(core, &args);
244 }
245
246 /* We couldn't disable those before
247 * 'si476x_core_cmd_power_down' since we expect to get CTS
248 * interrupt */
249 if (core->client->irq)
250 disable_irq(core->client->irq);
251 else
252 cancel_delayed_work_sync(&core->status_monitor);
253
254 if (!soft) {
255 if (gpio_is_valid(core->gpio_reset))
256 gpio_set_value_cansleep(core->gpio_reset, 0);
257 }
258 return err;
259}
260EXPORT_SYMBOL_GPL(si476x_core_stop);
261
262/**
263 * si476x_core_set_power_state() - set the level at which the power is
264 * supplied for the chip.
265 * @core: Core device structure
266 * @next_state: enum si476x_power_state describing power state to
267 * switch to.
268 *
269 * Switch on all the required power supplies
270 *
271 * This function returns 0 in case of suvccess and negative error code
272 * otherwise.
273 */
274int si476x_core_set_power_state(struct si476x_core *core,
275 enum si476x_power_state next_state)
276{
277 /*
278 It is not clear form the datasheet if it is possible to
279 work with device if not all power domains are operational.
280 So for now the power-up policy is "power-up all the things!"
281 */
282 int err = 0;
283
284 if (core->power_state == SI476X_POWER_INCONSISTENT) {
285 dev_err(&core->client->dev,
286 "The device in inconsistent power state\n");
287 return -EINVAL;
288 }
289
290 if (next_state != core->power_state) {
291 switch (next_state) {
292 case SI476X_POWER_UP_FULL:
293 err = regulator_bulk_enable(ARRAY_SIZE(core->supplies),
294 core->supplies);
295 if (err < 0) {
296 core->power_state = SI476X_POWER_INCONSISTENT;
297 break;
298 }
299 /*
300 * Startup timing diagram recommends to have a
301 * 100 us delay between enabling of the power
302 * supplies and turning the tuner on.
303 */
304 udelay(100);
305
306 err = si476x_core_start(core, false);
307 if (err < 0)
308 goto disable_regulators;
309
310 core->power_state = next_state;
311 break;
312
313 case SI476X_POWER_DOWN:
314 core->power_state = next_state;
315 err = si476x_core_stop(core, false);
316 if (err < 0)
317 core->power_state = SI476X_POWER_INCONSISTENT;
318disable_regulators:
319 err = regulator_bulk_disable(ARRAY_SIZE(core->supplies),
320 core->supplies);
321 if (err < 0)
322 core->power_state = SI476X_POWER_INCONSISTENT;
323 break;
324 default:
325 BUG();
326 }
327 }
328
329 return err;
330}
331EXPORT_SYMBOL_GPL(si476x_core_set_power_state);
332
333/**
334 * si476x_core_report_drainer_stop() - mark the completion of the RDS
335 * buffer drain porcess by the worker.
336 *
337 * @core: Core device structure
338 */
339static inline void si476x_core_report_drainer_stop(struct si476x_core *core)
340{
341 mutex_lock(&core->rds_drainer_status_lock);
342 core->rds_drainer_is_working = false;
343 mutex_unlock(&core->rds_drainer_status_lock);
344}
345
346/**
347 * si476x_core_start_rds_drainer_once() - start RDS drainer worker if
348 * ther is none working, do nothing otherwise
349 *
350 * @core: Datastructure corresponding to the chip.
351 */
352static inline void si476x_core_start_rds_drainer_once(struct si476x_core *core)
353{
354 mutex_lock(&core->rds_drainer_status_lock);
355 if (!core->rds_drainer_is_working) {
356 core->rds_drainer_is_working = true;
357 schedule_work(&core->rds_fifo_drainer);
358 }
359 mutex_unlock(&core->rds_drainer_status_lock);
360}
361/**
362 * si476x_drain_rds_fifo() - RDS buffer drainer.
363 * @work: struct work_struct being ppassed to the function by the
364 * kernel.
365 *
366 * Drain the contents of the RDS FIFO of
367 */
368static void si476x_core_drain_rds_fifo(struct work_struct *work)
369{
370 int err;
371
372 struct si476x_core *core = container_of(work, struct si476x_core,
373 rds_fifo_drainer);
374
375 struct si476x_rds_status_report report;
376
377 si476x_core_lock(core);
378 err = si476x_core_cmd_fm_rds_status(core, true, false, false, &report);
379 if (!err) {
380 int i = report.rdsfifoused;
381 dev_dbg(&core->client->dev,
382 "%d elements in RDS FIFO. Draining.\n", i);
383 for (; i > 0; --i) {
384 err = si476x_core_cmd_fm_rds_status(core, false, false,
385 (i == 1), &report);
386 if (err < 0)
387 goto unlock;
388
389 kfifo_in(&core->rds_fifo, report.rds,
390 sizeof(report.rds));
391 dev_dbg(&core->client->dev, "RDS data:\n %*ph\n",
392 (int)sizeof(report.rds), report.rds);
393 }
394 dev_dbg(&core->client->dev, "Drrrrained!\n");
395 wake_up_interruptible(&core->rds_read_queue);
396 }
397
398unlock:
399 si476x_core_unlock(core);
400 si476x_core_report_drainer_stop(core);
401}
402
403/**
404 * si476x_core_pronounce_dead()
405 *
406 * @core: Core device structure
407 *
408 * Mark the device as being dead and wake up all potentially waiting
409 * threads of execution.
410 *
411 */
412static void si476x_core_pronounce_dead(struct si476x_core *core)
413{
414 dev_info(&core->client->dev, "Core device is dead.\n");
415
416 atomic_set(&core->is_alive, 0);
417
418 /* Wake up al possible waiting processes */
419 wake_up_interruptible(&core->rds_read_queue);
420
421 atomic_set(&core->cts, 1);
422 wake_up(&core->command);
423
424 atomic_set(&core->stc, 1);
425 wake_up(&core->tuning);
426}
427
428/**
429 * si476x_core_i2c_xfer()
430 *
431 * @core: Core device structure
432 * @type: Transfer type
433 * @buf: Transfer buffer for/with data
434 * @count: Transfer buffer size
435 *
436 * Perfrom and I2C transfer(either read or write) and keep a counter
437 * of I/O errors. If the error counter rises above the threshold
438 * pronounce device dead.
439 *
440 * The function returns zero on succes or negative error code on
441 * failure.
442 */
443int si476x_core_i2c_xfer(struct si476x_core *core,
444 enum si476x_i2c_type type,
445 char *buf, int count)
446{
447 static int io_errors_count;
448 int err;
449 if (type == SI476X_I2C_SEND)
450 err = i2c_master_send(core->client, buf, count);
451 else
452 err = i2c_master_recv(core->client, buf, count);
453
454 if (err < 0) {
455 if (io_errors_count++ > SI476X_MAX_IO_ERRORS)
456 si476x_core_pronounce_dead(core);
457 } else {
458 io_errors_count = 0;
459 }
460
461 return err;
462}
463EXPORT_SYMBOL_GPL(si476x_core_i2c_xfer);
464
465/**
466 * si476x_get_status()
467 * @core: Core device structure
468 *
469 * Get the status byte of the core device by berforming one byte I2C
470 * read.
471 *
472 * The function returns a status value or a negative error code on
473 * error.
474 */
475static int si476x_core_get_status(struct si476x_core *core)
476{
477 u8 response;
478 int err = si476x_core_i2c_xfer(core, SI476X_I2C_RECV,
479 &response, sizeof(response));
480
481 return (err < 0) ? err : response;
482}
483
484/**
485 * si476x_get_and_signal_status() - IRQ dispatcher
486 * @core: Core device structure
487 *
488 * Dispatch the arrived interrupt request based on the value of the
489 * status byte reported by the tuner.
490 *
491 */
492static void si476x_core_get_and_signal_status(struct si476x_core *core)
493{
494 int status = si476x_core_get_status(core);
495 if (status < 0) {
496 dev_err(&core->client->dev, "Failed to get status\n");
497 return;
498 }
499
500 if (status & SI476X_CTS) {
501 /* Unfortunately completions could not be used for
502 * signalling CTS since this flag cannot be cleared
503 * in status byte, and therefore once it becomes true
504 * multiple calls to 'complete' would cause the
505 * commands following the current one to be completed
506 * before they actually are */
507 dev_dbg(&core->client->dev, "[interrupt] CTSINT\n");
508 atomic_set(&core->cts, 1);
509 wake_up(&core->command);
510 }
511
512 if (status & SI476X_FM_RDS_INT) {
513 dev_dbg(&core->client->dev, "[interrupt] RDSINT\n");
514 si476x_core_start_rds_drainer_once(core);
515 }
516
517 if (status & SI476X_STC_INT) {
518 dev_dbg(&core->client->dev, "[interrupt] STCINT\n");
519 atomic_set(&core->stc, 1);
520 wake_up(&core->tuning);
521 }
522}
523
524static void si476x_core_poll_loop(struct work_struct *work)
525{
526 struct si476x_core *core = SI476X_WORK_TO_CORE(work);
527
528 si476x_core_get_and_signal_status(core);
529
530 if (atomic_read(&core->is_alive))
531 si476x_core_schedule_polling_work(core);
532}
533
534static irqreturn_t si476x_core_interrupt(int irq, void *dev)
535{
536 struct si476x_core *core = dev;
537
538 si476x_core_get_and_signal_status(core);
539
540 return IRQ_HANDLED;
541}
542
543/**
544 * si476x_firmware_version_to_revision()
545 * @core: Core device structure
546 * @major: Firmware major number
547 * @minor1: Firmware first minor number
548 * @minor2: Firmware second minor number
549 *
550 * Convert a chip's firmware version number into an offset that later
551 * will be used to as offset in "vtable" of tuner functions
552 *
553 * This function returns a positive offset in case of success and a -1
554 * in case of failure.
555 */
556static int si476x_core_fwver_to_revision(struct si476x_core *core,
557 int func, int major,
558 int minor1, int minor2)
559{
560 switch (func) {
561 case SI476X_FUNC_FM_RECEIVER:
562 switch (major) {
563 case 5:
564 return SI476X_REVISION_A10;
565 case 8:
566 return SI476X_REVISION_A20;
567 case 10:
568 return SI476X_REVISION_A30;
569 default:
570 goto unknown_revision;
571 }
572 case SI476X_FUNC_AM_RECEIVER:
573 switch (major) {
574 case 5:
575 return SI476X_REVISION_A10;
576 case 7:
577 return SI476X_REVISION_A20;
578 case 9:
579 return SI476X_REVISION_A30;
580 default:
581 goto unknown_revision;
582 }
583 case SI476X_FUNC_WB_RECEIVER:
584 switch (major) {
585 case 3:
586 return SI476X_REVISION_A10;
587 case 5:
588 return SI476X_REVISION_A20;
589 case 7:
590 return SI476X_REVISION_A30;
591 default:
592 goto unknown_revision;
593 }
594 case SI476X_FUNC_BOOTLOADER:
595 default: /* FALLTHROUG */
596 BUG();
597 return -1;
598 }
599
600unknown_revision:
601 dev_err(&core->client->dev,
602 "Unsupported version of the firmware: %d.%d.%d, "
603 "reverting to A10 comptible functions\n",
604 major, minor1, minor2);
605
606 return SI476X_REVISION_A10;
607}
608
609/**
610 * si476x_get_revision_info()
611 * @core: Core device structure
612 *
613 * Get the firmware version number of the device. It is done in
614 * following three steps:
615 * 1. Power-up the device
616 * 2. Send the 'FUNC_INFO' command
617 * 3. Powering the device down.
618 *
619 * The function return zero on success and a negative error code on
620 * failure.
621 */
622static int si476x_core_get_revision_info(struct si476x_core *core)
623{
624 int rval;
625 struct si476x_func_info info;
626
627 si476x_core_lock(core);
628 rval = si476x_core_set_power_state(core, SI476X_POWER_UP_FULL);
629 if (rval < 0)
630 goto exit;
631
632 rval = si476x_core_cmd_func_info(core, &info);
633 if (rval < 0)
634 goto power_down;
635
636 core->revision = si476x_core_fwver_to_revision(core, info.func,
637 info.firmware.major,
638 info.firmware.minor[0],
639 info.firmware.minor[1]);
640power_down:
641 si476x_core_set_power_state(core, SI476X_POWER_DOWN);
642exit:
643 si476x_core_unlock(core);
644
645 return rval;
646}
647
648bool si476x_core_has_am(struct si476x_core *core)
649{
650 return core->chip_id == SI476X_CHIP_SI4761 ||
651 core->chip_id == SI476X_CHIP_SI4764;
652}
653EXPORT_SYMBOL_GPL(si476x_core_has_am);
654
655bool si476x_core_has_diversity(struct si476x_core *core)
656{
657 return core->chip_id == SI476X_CHIP_SI4764;
658}
659EXPORT_SYMBOL_GPL(si476x_core_has_diversity);
660
661bool si476x_core_is_a_secondary_tuner(struct si476x_core *core)
662{
663 return si476x_core_has_diversity(core) &&
664 (core->diversity_mode == SI476X_PHDIV_SECONDARY_ANTENNA ||
665 core->diversity_mode == SI476X_PHDIV_SECONDARY_COMBINING);
666}
667EXPORT_SYMBOL_GPL(si476x_core_is_a_secondary_tuner);
668
669bool si476x_core_is_a_primary_tuner(struct si476x_core *core)
670{
671 return si476x_core_has_diversity(core) &&
672 (core->diversity_mode == SI476X_PHDIV_PRIMARY_ANTENNA ||
673 core->diversity_mode == SI476X_PHDIV_PRIMARY_COMBINING);
674}
675EXPORT_SYMBOL_GPL(si476x_core_is_a_primary_tuner);
676
677bool si476x_core_is_in_am_receiver_mode(struct si476x_core *core)
678{
679 return si476x_core_has_am(core) &&
680 (core->power_up_parameters.func == SI476X_FUNC_AM_RECEIVER);
681}
682EXPORT_SYMBOL_GPL(si476x_core_is_in_am_receiver_mode);
683
684bool si476x_core_is_powered_up(struct si476x_core *core)
685{
686 return core->power_state == SI476X_POWER_UP_FULL;
687}
688EXPORT_SYMBOL_GPL(si476x_core_is_powered_up);
689
690static int si476x_core_probe(struct i2c_client *client,
691 const struct i2c_device_id *id)
692{
693 int rval;
694 struct si476x_core *core;
695 struct si476x_platform_data *pdata;
696 struct mfd_cell *cell;
697 int cell_num;
698
699 core = devm_kzalloc(&client->dev, sizeof(*core), GFP_KERNEL);
700 if (!core) {
701 dev_err(&client->dev,
702 "failed to allocate 'struct si476x_core'\n");
703 return -ENOMEM;
704 }
705 core->client = client;
706
707 core->regmap = devm_regmap_init_si476x(core);
708 if (IS_ERR(core->regmap)) {
709 rval = PTR_ERR(core->regmap);
710 dev_err(&client->dev,
711 "Failed to allocate register map: %d\n",
712 rval);
713 return rval;
714 }
715
716 i2c_set_clientdata(client, core);
717
718 atomic_set(&core->is_alive, 0);
719 core->power_state = SI476X_POWER_DOWN;
720
721 pdata = dev_get_platdata(&client->dev);
722 if (pdata) {
723 memcpy(&core->power_up_parameters,
724 &pdata->power_up_parameters,
725 sizeof(core->power_up_parameters));
726
727 core->gpio_reset = -1;
728 if (gpio_is_valid(pdata->gpio_reset)) {
729 rval = gpio_request(pdata->gpio_reset, "si476x reset");
730 if (rval) {
731 dev_err(&client->dev,
732 "Failed to request gpio: %d\n", rval);
733 return rval;
734 }
735 core->gpio_reset = pdata->gpio_reset;
736 gpio_direction_output(core->gpio_reset, 0);
737 }
738
739 core->diversity_mode = pdata->diversity_mode;
740 memcpy(&core->pinmux, &pdata->pinmux,
741 sizeof(struct si476x_pinmux));
742 } else {
743 dev_err(&client->dev, "No platform data provided\n");
744 return -EINVAL;
745 }
746
747 core->supplies[0].supply = "vd";
748 core->supplies[1].supply = "va";
749 core->supplies[2].supply = "vio1";
750 core->supplies[3].supply = "vio2";
751
752 rval = devm_regulator_bulk_get(&client->dev,
753 ARRAY_SIZE(core->supplies),
754 core->supplies);
755 if (rval) {
756 dev_err(&client->dev, "Failet to gett all of the regulators\n");
757 goto free_gpio;
758 }
759
760 mutex_init(&core->cmd_lock);
761 init_waitqueue_head(&core->command);
762 init_waitqueue_head(&core->tuning);
763
764 rval = kfifo_alloc(&core->rds_fifo,
765 SI476X_DRIVER_RDS_FIFO_DEPTH *
766 sizeof(struct v4l2_rds_data),
767 GFP_KERNEL);
768 if (rval) {
769 dev_err(&client->dev, "Could not alloate the FIFO\n");
770 goto free_gpio;
771 }
772 mutex_init(&core->rds_drainer_status_lock);
773 init_waitqueue_head(&core->rds_read_queue);
774 INIT_WORK(&core->rds_fifo_drainer, si476x_core_drain_rds_fifo);
775
776 if (client->irq) {
777 rval = devm_request_threaded_irq(&client->dev,
778 client->irq, NULL,
779 si476x_core_interrupt,
780 IRQF_TRIGGER_FALLING,
781 client->name, core);
782 if (rval < 0) {
783 dev_err(&client->dev, "Could not request IRQ %d\n",
784 client->irq);
785 goto free_kfifo;
786 }
787 disable_irq(client->irq);
788 dev_dbg(&client->dev, "IRQ requested.\n");
789
790 core->rds_fifo_depth = 20;
791 } else {
792 INIT_DELAYED_WORK(&core->status_monitor,
793 si476x_core_poll_loop);
794 dev_info(&client->dev,
795 "No IRQ number specified, will use polling\n");
796
797 core->rds_fifo_depth = 5;
798 }
799
800 core->chip_id = id->driver_data;
801
802 rval = si476x_core_get_revision_info(core);
803 if (rval < 0) {
804 rval = -ENODEV;
805 goto free_kfifo;
806 }
807
808 cell_num = 0;
809
810 cell = &core->cells[SI476X_RADIO_CELL];
811 cell->name = "si476x-radio";
812 cell_num++;
813
814#ifdef CONFIG_SND_SOC_SI476X
815 if ((core->chip_id == SI476X_CHIP_SI4761 ||
816 core->chip_id == SI476X_CHIP_SI4764) &&
817 core->pinmux.dclk == SI476X_DCLK_DAUDIO &&
818 core->pinmux.dfs == SI476X_DFS_DAUDIO &&
819 core->pinmux.dout == SI476X_DOUT_I2S_OUTPUT &&
820 core->pinmux.xout == SI476X_XOUT_TRISTATE) {
821 cell = &core->cells[SI476X_CODEC_CELL];
822 cell->name = "si476x-codec";
823 cell_num++;
824 }
825#endif
826 rval = mfd_add_devices(&client->dev,
827 (client->adapter->nr << 8) + client->addr,
828 core->cells, cell_num,
829 NULL, 0, NULL);
830 if (!rval)
831 return 0;
832
833free_kfifo:
834 kfifo_free(&core->rds_fifo);
835
836free_gpio:
837 if (gpio_is_valid(core->gpio_reset))
838 gpio_free(core->gpio_reset);
839
840 return rval;
841}
842
843static int si476x_core_remove(struct i2c_client *client)
844{
845 struct si476x_core *core = i2c_get_clientdata(client);
846
847 si476x_core_pronounce_dead(core);
848 mfd_remove_devices(&client->dev);
849
850 if (client->irq)
851 disable_irq(client->irq);
852 else
853 cancel_delayed_work_sync(&core->status_monitor);
854
855 kfifo_free(&core->rds_fifo);
856
857 if (gpio_is_valid(core->gpio_reset))
858 gpio_free(core->gpio_reset);
859
860 return 0;
861}
862
863
864static const struct i2c_device_id si476x_id[] = {
865 { "si4761", SI476X_CHIP_SI4761 },
866 { "si4764", SI476X_CHIP_SI4764 },
867 { "si4768", SI476X_CHIP_SI4768 },
868 { },
869};
870MODULE_DEVICE_TABLE(i2c, si476x_id);
871
872static struct i2c_driver si476x_core_driver = {
873 .driver = {
874 .name = "si476x-core",
875 .owner = THIS_MODULE,
876 },
877 .probe = si476x_core_probe,
878 .remove = si476x_core_remove,
879 .id_table = si476x_id,
880};
881module_i2c_driver(si476x_core_driver);
882
883
884MODULE_AUTHOR("Andrey Smirnov <andrew.smirnov@gmail.com>");
885MODULE_DESCRIPTION("Si4761/64/68 AM/FM MFD core device driver");
886MODULE_LICENSE("GPL");