1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * drivers/mfd/si476x-i2c.c -- Core device driver for si476x MFD
4 * device
5 *
6 * Copyright (C) 2012 Innovative Converged Devices(ICD)
7 * Copyright (C) 2013 Andrey Smirnov
8 *
9 * Author: Andrey Smirnov <andrew.smirnov@gmail.com>
10 */
11#include <linux/module.h>
12
13#include <linux/slab.h>
14#include <linux/interrupt.h>
15#include <linux/delay.h>
16#include <linux/gpio.h>
17#include <linux/regulator/consumer.h>
18#include <linux/i2c.h>
19#include <linux/err.h>
20
21#include <linux/mfd/si476x-core.h>
22
23#define SI476X_MAX_IO_ERRORS 10
24#define SI476X_DRIVER_RDS_FIFO_DEPTH 128
25
26/**
27 * si476x_core_config_pinmux() - pin function configuration function
28 *
29 * @core: Core device structure
30 *
31 * Configure the functions of the pins of the radio chip.
32 *
33 * The function returns zero in case of succes or negative error code
34 * otherwise.
35 */
36static int si476x_core_config_pinmux(struct si476x_core *core)
37{
38 int err;
39 dev_dbg(&core->client->dev, "Configuring pinmux\n");
40 err = si476x_core_cmd_dig_audio_pin_cfg(core,
41 core->pinmux.dclk,
42 core->pinmux.dfs,
43 core->pinmux.dout,
44 core->pinmux.xout);
45 if (err < 0) {
46 dev_err(&core->client->dev,
47 "Failed to configure digital audio pins(err = %d)\n",
48 err);
49 return err;
50 }
51
52 err = si476x_core_cmd_zif_pin_cfg(core,
53 core->pinmux.iqclk,
54 core->pinmux.iqfs,
55 core->pinmux.iout,
56 core->pinmux.qout);
57 if (err < 0) {
58 dev_err(&core->client->dev,
59 "Failed to configure ZIF pins(err = %d)\n",
60 err);
61 return err;
62 }
63
64 err = si476x_core_cmd_ic_link_gpo_ctl_pin_cfg(core,
65 core->pinmux.icin,
66 core->pinmux.icip,
67 core->pinmux.icon,
68 core->pinmux.icop);
69 if (err < 0) {
70 dev_err(&core->client->dev,
71 "Failed to configure IC-Link/GPO pins(err = %d)\n",
72 err);
73 return err;
74 }
75
76 err = si476x_core_cmd_ana_audio_pin_cfg(core,
77 core->pinmux.lrout);
78 if (err < 0) {
79 dev_err(&core->client->dev,
80 "Failed to configure analog audio pins(err = %d)\n",
81 err);
82 return err;
83 }
84
85 err = si476x_core_cmd_intb_pin_cfg(core,
86 core->pinmux.intb,
87 core->pinmux.a1);
88 if (err < 0) {
89 dev_err(&core->client->dev,
90 "Failed to configure interrupt pins(err = %d)\n",
91 err);
92 return err;
93 }
94
95 return 0;
96}
97
98static inline void si476x_core_schedule_polling_work(struct si476x_core *core)
99{
100 schedule_delayed_work(dwork: &core->status_monitor,
101 delay: usecs_to_jiffies(SI476X_STATUS_POLL_US));
102}
103
104/**
105 * si476x_core_start() - early chip startup function
106 * @core: Core device structure
107 * @soft: When set, this flag forces "soft" startup, where "soft"
108 * power down is the one done by sending appropriate command instead
109 * of using reset pin of the tuner
110 *
111 * Perform required startup sequence to correctly power
112 * up the chip and perform initial configuration. It does the
113 * following sequence of actions:
114 * 1. Claims and enables the power supplies VD and VIO1 required
115 * for I2C interface of the chip operation.
116 * 2. Waits for 100us, pulls the reset line up, enables irq,
117 * waits for another 100us as it is specified by the
118 * datasheet.
119 * 3. Sends 'POWER_UP' command to the device with all provided
120 * information about power-up parameters.
121 * 4. Configures, pin multiplexor, disables digital audio and
122 * configures interrupt sources.
123 *
124 * The function returns zero in case of succes or negative error code
125 * otherwise.
126 */
127int si476x_core_start(struct si476x_core *core, bool soft)
128{
129 struct i2c_client *client = core->client;
130 int err;
131
132 if (!soft) {
133 if (gpio_is_valid(number: core->gpio_reset))
134 gpio_set_value_cansleep(gpio: core->gpio_reset, value: 1);
135
136 if (client->irq)
137 enable_irq(irq: client->irq);
138
139 udelay(100);
140
141 if (!client->irq) {
142 atomic_set(v: &core->is_alive, i: 1);
143 si476x_core_schedule_polling_work(core);
144 }
145 } else {
146 if (client->irq)
147 enable_irq(irq: client->irq);
148 else {
149 atomic_set(v: &core->is_alive, i: 1);
150 si476x_core_schedule_polling_work(core);
151 }
152 }
153
154 err = si476x_core_cmd_power_up(core,
155 &core->power_up_parameters);
156
157 if (err < 0) {
158 dev_err(&core->client->dev,
159 "Power up failure(err = %d)\n",
160 err);
161 goto disable_irq;
162 }
163
164 if (client->irq)
165 atomic_set(v: &core->is_alive, i: 1);
166
167 err = si476x_core_config_pinmux(core);
168 if (err < 0) {
169 dev_err(&core->client->dev,
170 "Failed to configure pinmux(err = %d)\n",
171 err);
172 goto disable_irq;
173 }
174
175 if (client->irq) {
176 err = regmap_write(map: core->regmap,
177 reg: SI476X_PROP_INT_CTL_ENABLE,
178 val: SI476X_RDSIEN |
179 SI476X_STCIEN |
180 SI476X_CTSIEN);
181 if (err < 0) {
182 dev_err(&core->client->dev,
183 "Failed to configure interrupt sources"
184 "(err = %d)\n", err);
185 goto disable_irq;
186 }
187 }
188
189 return 0;
190
191disable_irq:
192 if (err == -ENODEV)
193 atomic_set(v: &core->is_alive, i: 0);
194
195 if (client->irq)
196 disable_irq(irq: client->irq);
197 else
198 cancel_delayed_work_sync(dwork: &core->status_monitor);
199
200 if (gpio_is_valid(number: core->gpio_reset))
201 gpio_set_value_cansleep(gpio: core->gpio_reset, value: 0);
202
203 return err;
204}
205EXPORT_SYMBOL_GPL(si476x_core_start);
206
207/**
208 * si476x_core_stop() - chip power-down function
209 * @core: Core device structure
210 * @soft: When set, function sends a POWER_DOWN command instead of
211 * bringing reset line low
212 *
213 * Power down the chip by performing following actions:
214 * 1. Disable IRQ or stop the polling worker
215 * 2. Send the POWER_DOWN command if the power down is soft or bring
216 * reset line low if not.
217 *
218 * The function returns zero in case of succes or negative error code
219 * otherwise.
220 */
221int si476x_core_stop(struct si476x_core *core, bool soft)
222{
223 int err = 0;
224 atomic_set(v: &core->is_alive, i: 0);
225
226 if (soft) {
227 /* TODO: This probably shoud be a configurable option,
228 * so it is possible to have the chips keep their
229 * oscillators running
230 */
231 struct si476x_power_down_args args = {
232 .xosc = false,
233 };
234 err = si476x_core_cmd_power_down(core, &args);
235 }
236
237 /* We couldn't disable those before
238 * 'si476x_core_cmd_power_down' since we expect to get CTS
239 * interrupt */
240 if (core->client->irq)
241 disable_irq(irq: core->client->irq);
242 else
243 cancel_delayed_work_sync(dwork: &core->status_monitor);
244
245 if (!soft) {
246 if (gpio_is_valid(number: core->gpio_reset))
247 gpio_set_value_cansleep(gpio: core->gpio_reset, value: 0);
248 }
249 return err;
250}
251EXPORT_SYMBOL_GPL(si476x_core_stop);
252
253/**
254 * si476x_core_set_power_state() - set the level at which the power is
255 * supplied for the chip.
256 * @core: Core device structure
257 * @next_state: enum si476x_power_state describing power state to
258 * switch to.
259 *
260 * Switch on all the required power supplies
261 *
262 * This function returns 0 in case of suvccess and negative error code
263 * otherwise.
264 */
265int si476x_core_set_power_state(struct si476x_core *core,
266 enum si476x_power_state next_state)
267{
268 /*
269 It is not clear form the datasheet if it is possible to
270 work with device if not all power domains are operational.
271 So for now the power-up policy is "power-up all the things!"
272 */
273 int err = 0;
274
275 if (core->power_state == SI476X_POWER_INCONSISTENT) {
276 dev_err(&core->client->dev,
277 "The device in inconsistent power state\n");
278 return -EINVAL;
279 }
280
281 if (next_state != core->power_state) {
282 switch (next_state) {
283 case SI476X_POWER_UP_FULL:
284 err = regulator_bulk_enable(ARRAY_SIZE(core->supplies),
285 consumers: core->supplies);
286 if (err < 0) {
287 core->power_state = SI476X_POWER_INCONSISTENT;
288 break;
289 }
290 /*
291 * Startup timing diagram recommends to have a
292 * 100 us delay between enabling of the power
293 * supplies and turning the tuner on.
294 */
295 udelay(100);
296
297 err = si476x_core_start(core, false);
298 if (err < 0)
299 goto disable_regulators;
300
301 core->power_state = next_state;
302 break;
303
304 case SI476X_POWER_DOWN:
305 core->power_state = next_state;
306 err = si476x_core_stop(core, false);
307 if (err < 0)
308 core->power_state = SI476X_POWER_INCONSISTENT;
309disable_regulators:
310 err = regulator_bulk_disable(ARRAY_SIZE(core->supplies),
311 consumers: core->supplies);
312 if (err < 0)
313 core->power_state = SI476X_POWER_INCONSISTENT;
314 break;
315 default:
316 BUG();
317 }
318 }
319
320 return err;
321}
322EXPORT_SYMBOL_GPL(si476x_core_set_power_state);
323
324/**
325 * si476x_core_report_drainer_stop() - mark the completion of the RDS
326 * buffer drain porcess by the worker.
327 *
328 * @core: Core device structure
329 */
330static inline void si476x_core_report_drainer_stop(struct si476x_core *core)
331{
332 mutex_lock(&core->rds_drainer_status_lock);
333 core->rds_drainer_is_working = false;
334 mutex_unlock(lock: &core->rds_drainer_status_lock);
335}
336
337/**
338 * si476x_core_start_rds_drainer_once() - start RDS drainer worker if
339 * ther is none working, do nothing otherwise
340 *
341 * @core: Datastructure corresponding to the chip.
342 */
343static inline void si476x_core_start_rds_drainer_once(struct si476x_core *core)
344{
345 mutex_lock(&core->rds_drainer_status_lock);
346 if (!core->rds_drainer_is_working) {
347 core->rds_drainer_is_working = true;
348 schedule_work(work: &core->rds_fifo_drainer);
349 }
350 mutex_unlock(lock: &core->rds_drainer_status_lock);
351}
352/**
353 * si476x_core_drain_rds_fifo() - RDS buffer drainer.
354 * @work: struct work_struct being ppassed to the function by the
355 * kernel.
356 *
357 * Drain the contents of the RDS FIFO of
358 */
359static void si476x_core_drain_rds_fifo(struct work_struct *work)
360{
361 int err;
362
363 struct si476x_core *core = container_of(work, struct si476x_core,
364 rds_fifo_drainer);
365
366 struct si476x_rds_status_report report;
367
368 si476x_core_lock(core);
369 err = si476x_core_cmd_fm_rds_status(core, true, false, false, &report);
370 if (!err) {
371 int i = report.rdsfifoused;
372 dev_dbg(&core->client->dev,
373 "%d elements in RDS FIFO. Draining.\n", i);
374 for (; i > 0; --i) {
375 err = si476x_core_cmd_fm_rds_status(core, false, false,
376 (i == 1), &report);
377 if (err < 0)
378 goto unlock;
379
380 kfifo_in(&core->rds_fifo, report.rds,
381 sizeof(report.rds));
382 dev_dbg(&core->client->dev, "RDS data:\n %*ph\n",
383 (int)sizeof(report.rds), report.rds);
384 }
385 dev_dbg(&core->client->dev, "Drrrrained!\n");
386 wake_up_interruptible(&core->rds_read_queue);
387 }
388
389unlock:
390 si476x_core_unlock(core);
391 si476x_core_report_drainer_stop(core);
392}
393
394/**
395 * si476x_core_pronounce_dead()
396 *
397 * @core: Core device structure
398 *
399 * Mark the device as being dead and wake up all potentially waiting
400 * threads of execution.
401 *
402 */
403static void si476x_core_pronounce_dead(struct si476x_core *core)
404{
405 dev_info(&core->client->dev, "Core device is dead.\n");
406
407 atomic_set(v: &core->is_alive, i: 0);
408
409 /* Wake up al possible waiting processes */
410 wake_up_interruptible(&core->rds_read_queue);
411
412 atomic_set(v: &core->cts, i: 1);
413 wake_up(&core->command);
414
415 atomic_set(v: &core->stc, i: 1);
416 wake_up(&core->tuning);
417}
418
419/**
420 * si476x_core_i2c_xfer()
421 *
422 * @core: Core device structure
423 * @type: Transfer type
424 * @buf: Transfer buffer for/with data
425 * @count: Transfer buffer size
426 *
427 * Perfrom and I2C transfer(either read or write) and keep a counter
428 * of I/O errors. If the error counter rises above the threshold
429 * pronounce device dead.
430 *
431 * The function returns zero on succes or negative error code on
432 * failure.
433 */
434int si476x_core_i2c_xfer(struct si476x_core *core,
435 enum si476x_i2c_type type,
436 char *buf, int count)
437{
438 static int io_errors_count;
439 int err;
440 if (type == SI476X_I2C_SEND)
441 err = i2c_master_send(client: core->client, buf, count);
442 else
443 err = i2c_master_recv(client: core->client, buf, count);
444
445 if (err < 0) {
446 if (io_errors_count++ > SI476X_MAX_IO_ERRORS)
447 si476x_core_pronounce_dead(core);
448 } else {
449 io_errors_count = 0;
450 }
451
452 return err;
453}
454EXPORT_SYMBOL_GPL(si476x_core_i2c_xfer);
455
456/**
457 * si476x_core_get_status()
458 * @core: Core device structure
459 *
460 * Get the status byte of the core device by berforming one byte I2C
461 * read.
462 *
463 * The function returns a status value or a negative error code on
464 * error.
465 */
466static int si476x_core_get_status(struct si476x_core *core)
467{
468 u8 response;
469 int err = si476x_core_i2c_xfer(core, SI476X_I2C_RECV,
470 &response, sizeof(response));
471
472 return (err < 0) ? err : response;
473}
474
475/**
476 * si476x_core_get_and_signal_status() - IRQ dispatcher
477 * @core: Core device structure
478 *
479 * Dispatch the arrived interrupt request based on the value of the
480 * status byte reported by the tuner.
481 *
482 */
483static void si476x_core_get_and_signal_status(struct si476x_core *core)
484{
485 int status = si476x_core_get_status(core);
486 if (status < 0) {
487 dev_err(&core->client->dev, "Failed to get status\n");
488 return;
489 }
490
491 if (status & SI476X_CTS) {
492 /* Unfortunately completions could not be used for
493 * signalling CTS since this flag cannot be cleared
494 * in status byte, and therefore once it becomes true
495 * multiple calls to 'complete' would cause the
496 * commands following the current one to be completed
497 * before they actually are */
498 dev_dbg(&core->client->dev, "[interrupt] CTSINT\n");
499 atomic_set(v: &core->cts, i: 1);
500 wake_up(&core->command);
501 }
502
503 if (status & SI476X_FM_RDS_INT) {
504 dev_dbg(&core->client->dev, "[interrupt] RDSINT\n");
505 si476x_core_start_rds_drainer_once(core);
506 }
507
508 if (status & SI476X_STC_INT) {
509 dev_dbg(&core->client->dev, "[interrupt] STCINT\n");
510 atomic_set(v: &core->stc, i: 1);
511 wake_up(&core->tuning);
512 }
513}
514
515static void si476x_core_poll_loop(struct work_struct *work)
516{
517 struct si476x_core *core = SI476X_WORK_TO_CORE(work);
518
519 si476x_core_get_and_signal_status(core);
520
521 if (atomic_read(v: &core->is_alive))
522 si476x_core_schedule_polling_work(core);
523}
524
525static irqreturn_t si476x_core_interrupt(int irq, void *dev)
526{
527 struct si476x_core *core = dev;
528
529 si476x_core_get_and_signal_status(core);
530
531 return IRQ_HANDLED;
532}
533
534/**
535 * si476x_core_fwver_to_revision()
536 * @core: Core device structure
537 * @func: Selects the boot function of the device:
538 * *_BOOTLOADER - Boot loader
539 * *_FM_RECEIVER - FM receiver
540 * *_AM_RECEIVER - AM receiver
541 * *_WB_RECEIVER - Weatherband receiver
542 * @major: Firmware major number
543 * @minor1: Firmware first minor number
544 * @minor2: Firmware second minor number
545 *
546 * Convert a chip's firmware version number into an offset that later
547 * will be used to as offset in "vtable" of tuner functions
548 *
549 * This function returns a positive offset in case of success and a -1
550 * in case of failure.
551 */
552static int si476x_core_fwver_to_revision(struct si476x_core *core,
553 int func, int major,
554 int minor1, int minor2)
555{
556 switch (func) {
557 case SI476X_FUNC_FM_RECEIVER:
558 switch (major) {
559 case 5:
560 return SI476X_REVISION_A10;
561 case 8:
562 return SI476X_REVISION_A20;
563 case 10:
564 return SI476X_REVISION_A30;
565 default:
566 goto unknown_revision;
567 }
568 case SI476X_FUNC_AM_RECEIVER:
569 switch (major) {
570 case 5:
571 return SI476X_REVISION_A10;
572 case 7:
573 return SI476X_REVISION_A20;
574 case 9:
575 return SI476X_REVISION_A30;
576 default:
577 goto unknown_revision;
578 }
579 case SI476X_FUNC_WB_RECEIVER:
580 switch (major) {
581 case 3:
582 return SI476X_REVISION_A10;
583 case 5:
584 return SI476X_REVISION_A20;
585 case 7:
586 return SI476X_REVISION_A30;
587 default:
588 goto unknown_revision;
589 }
590 case SI476X_FUNC_BOOTLOADER:
591 default: /* FALLTHROUGH */
592 BUG();
593 return -1;
594 }
595
596unknown_revision:
597 dev_err(&core->client->dev,
598 "Unsupported version of the firmware: %d.%d.%d, "
599 "reverting to A10 compatible functions\n",
600 major, minor1, minor2);
601
602 return SI476X_REVISION_A10;
603}
604
605/**
606 * si476x_core_get_revision_info()
607 * @core: Core device structure
608 *
609 * Get the firmware version number of the device. It is done in
610 * following three steps:
611 * 1. Power-up the device
612 * 2. Send the 'FUNC_INFO' command
613 * 3. Powering the device down.
614 *
615 * The function return zero on success and a negative error code on
616 * failure.
617 */
618static int si476x_core_get_revision_info(struct si476x_core *core)
619{
620 int rval;
621 struct si476x_func_info info;
622
623 si476x_core_lock(core);
624 rval = si476x_core_set_power_state(core, SI476X_POWER_UP_FULL);
625 if (rval < 0)
626 goto exit;
627
628 rval = si476x_core_cmd_func_info(core, &info);
629 if (rval < 0)
630 goto power_down;
631
632 core->revision = si476x_core_fwver_to_revision(core, func: info.func,
633 major: info.firmware.major,
634 minor1: info.firmware.minor[0],
635 minor2: info.firmware.minor[1]);
636power_down:
637 si476x_core_set_power_state(core, SI476X_POWER_DOWN);
638exit:
639 si476x_core_unlock(core);
640
641 return rval;
642}
643
644bool si476x_core_has_am(struct si476x_core *core)
645{
646 return core->chip_id == SI476X_CHIP_SI4761 ||
647 core->chip_id == SI476X_CHIP_SI4764;
648}
649EXPORT_SYMBOL_GPL(si476x_core_has_am);
650
651bool si476x_core_has_diversity(struct si476x_core *core)
652{
653 return core->chip_id == SI476X_CHIP_SI4764;
654}
655EXPORT_SYMBOL_GPL(si476x_core_has_diversity);
656
657bool si476x_core_is_a_secondary_tuner(struct si476x_core *core)
658{
659 return si476x_core_has_diversity(core) &&
660 (core->diversity_mode == SI476X_PHDIV_SECONDARY_ANTENNA ||
661 core->diversity_mode == SI476X_PHDIV_SECONDARY_COMBINING);
662}
663EXPORT_SYMBOL_GPL(si476x_core_is_a_secondary_tuner);
664
665bool si476x_core_is_a_primary_tuner(struct si476x_core *core)
666{
667 return si476x_core_has_diversity(core) &&
668 (core->diversity_mode == SI476X_PHDIV_PRIMARY_ANTENNA ||
669 core->diversity_mode == SI476X_PHDIV_PRIMARY_COMBINING);
670}
671EXPORT_SYMBOL_GPL(si476x_core_is_a_primary_tuner);
672
673bool si476x_core_is_in_am_receiver_mode(struct si476x_core *core)
674{
675 return si476x_core_has_am(core) &&
676 (core->power_up_parameters.func == SI476X_FUNC_AM_RECEIVER);
677}
678EXPORT_SYMBOL_GPL(si476x_core_is_in_am_receiver_mode);
679
680bool si476x_core_is_powered_up(struct si476x_core *core)
681{
682 return core->power_state == SI476X_POWER_UP_FULL;
683}
684EXPORT_SYMBOL_GPL(si476x_core_is_powered_up);
685
686static int si476x_core_probe(struct i2c_client *client)
687{
688 const struct i2c_device_id *id = i2c_client_get_device_id(client);
689 int rval;
690 struct si476x_core *core;
691 struct si476x_platform_data *pdata;
692 struct mfd_cell *cell;
693 int cell_num;
694
695 core = devm_kzalloc(dev: &client->dev, size: sizeof(*core), GFP_KERNEL);
696 if (!core)
697 return -ENOMEM;
698
699 core->client = client;
700
701 core->regmap = devm_regmap_init_si476x(core);
702 if (IS_ERR(ptr: core->regmap)) {
703 rval = PTR_ERR(ptr: core->regmap);
704 dev_err(&client->dev,
705 "Failed to allocate register map: %d\n",
706 rval);
707 return rval;
708 }
709
710 i2c_set_clientdata(client, data: core);
711
712 atomic_set(v: &core->is_alive, i: 0);
713 core->power_state = SI476X_POWER_DOWN;
714
715 pdata = dev_get_platdata(dev: &client->dev);
716 if (pdata) {
717 memcpy(&core->power_up_parameters,
718 &pdata->power_up_parameters,
719 sizeof(core->power_up_parameters));
720
721 core->gpio_reset = -1;
722 if (gpio_is_valid(number: pdata->gpio_reset)) {
723 rval = gpio_request(gpio: pdata->gpio_reset, label: "si476x reset");
724 if (rval) {
725 dev_err(&client->dev,
726 "Failed to request gpio: %d\n", rval);
727 return rval;
728 }
729 core->gpio_reset = pdata->gpio_reset;
730 gpio_direction_output(gpio: core->gpio_reset, value: 0);
731 }
732
733 core->diversity_mode = pdata->diversity_mode;
734 memcpy(&core->pinmux, &pdata->pinmux,
735 sizeof(struct si476x_pinmux));
736 } else {
737 dev_err(&client->dev, "No platform data provided\n");
738 return -EINVAL;
739 }
740
741 core->supplies[0].supply = "vd";
742 core->supplies[1].supply = "va";
743 core->supplies[2].supply = "vio1";
744 core->supplies[3].supply = "vio2";
745
746 rval = devm_regulator_bulk_get(dev: &client->dev,
747 ARRAY_SIZE(core->supplies),
748 consumers: core->supplies);
749 if (rval) {
750 dev_err(&client->dev, "Failed to get all of the regulators\n");
751 goto free_gpio;
752 }
753
754 mutex_init(&core->cmd_lock);
755 init_waitqueue_head(&core->command);
756 init_waitqueue_head(&core->tuning);
757
758 rval = kfifo_alloc(&core->rds_fifo,
759 SI476X_DRIVER_RDS_FIFO_DEPTH *
760 sizeof(struct v4l2_rds_data),
761 GFP_KERNEL);
762 if (rval) {
763 dev_err(&client->dev, "Could not allocate the FIFO\n");
764 goto free_gpio;
765 }
766 mutex_init(&core->rds_drainer_status_lock);
767 init_waitqueue_head(&core->rds_read_queue);
768 INIT_WORK(&core->rds_fifo_drainer, si476x_core_drain_rds_fifo);
769
770 if (client->irq) {
771 rval = devm_request_threaded_irq(dev: &client->dev,
772 irq: client->irq, NULL,
773 thread_fn: si476x_core_interrupt,
774 IRQF_TRIGGER_FALLING |
775 IRQF_ONESHOT,
776 devname: client->name, dev_id: core);
777 if (rval < 0) {
778 dev_err(&client->dev, "Could not request IRQ %d\n",
779 client->irq);
780 goto free_kfifo;
781 }
782 disable_irq(irq: client->irq);
783 dev_dbg(&client->dev, "IRQ requested.\n");
784
785 core->rds_fifo_depth = 20;
786 } else {
787 INIT_DELAYED_WORK(&core->status_monitor,
788 si476x_core_poll_loop);
789 dev_info(&client->dev,
790 "No IRQ number specified, will use polling\n");
791
792 core->rds_fifo_depth = 5;
793 }
794
795 core->chip_id = id->driver_data;
796
797 rval = si476x_core_get_revision_info(core);
798 if (rval < 0) {
799 rval = -ENODEV;
800 goto free_kfifo;
801 }
802
803 cell_num = 0;
804
805 cell = &core->cells[SI476X_RADIO_CELL];
806 cell->name = "si476x-radio";
807 cell_num++;
808
809#ifdef CONFIG_SND_SOC_SI476X
810 if ((core->chip_id == SI476X_CHIP_SI4761 ||
811 core->chip_id == SI476X_CHIP_SI4764) &&
812 core->pinmux.dclk == SI476X_DCLK_DAUDIO &&
813 core->pinmux.dfs == SI476X_DFS_DAUDIO &&
814 core->pinmux.dout == SI476X_DOUT_I2S_OUTPUT &&
815 core->pinmux.xout == SI476X_XOUT_TRISTATE) {
816 cell = &core->cells[SI476X_CODEC_CELL];
817 cell->name = "si476x-codec";
818 cell_num++;
819 }
820#endif
821 rval = mfd_add_devices(parent: &client->dev,
822 id: (client->adapter->nr << 8) + client->addr,
823 cells: core->cells, n_devs: cell_num,
824 NULL, irq_base: 0, NULL);
825 if (!rval)
826 return 0;
827
828free_kfifo:
829 kfifo_free(&core->rds_fifo);
830
831free_gpio:
832 if (gpio_is_valid(number: core->gpio_reset))
833 gpio_free(gpio: core->gpio_reset);
834
835 return rval;
836}
837
838static void si476x_core_remove(struct i2c_client *client)
839{
840 struct si476x_core *core = i2c_get_clientdata(client);
841
842 si476x_core_pronounce_dead(core);
843 mfd_remove_devices(parent: &client->dev);
844
845 if (client->irq)
846 disable_irq(irq: client->irq);
847 else
848 cancel_delayed_work_sync(dwork: &core->status_monitor);
849
850 kfifo_free(&core->rds_fifo);
851
852 if (gpio_is_valid(number: core->gpio_reset))
853 gpio_free(gpio: core->gpio_reset);
854}
855
856
857static const struct i2c_device_id si476x_id[] = {
858 { "si4761", SI476X_CHIP_SI4761 },
859 { "si4764", SI476X_CHIP_SI4764 },
860 { "si4768", SI476X_CHIP_SI4768 },
861 { },
862};
863MODULE_DEVICE_TABLE(i2c, si476x_id);
864
865static struct i2c_driver si476x_core_driver = {
866 .driver = {
867 .name = "si476x-core",
868 },
869 .probe = si476x_core_probe,
870 .remove = si476x_core_remove,
871 .id_table = si476x_id,
872};
873module_i2c_driver(si476x_core_driver);
874
875
876MODULE_AUTHOR("Andrey Smirnov <andrew.smirnov@gmail.com>");
877MODULE_DESCRIPTION("Si4761/64/68 AM/FM MFD core device driver");
878MODULE_LICENSE("GPL");
879

source code of linux/drivers/mfd/si476x-i2c.c