Merge tag 'arc-5.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc
[linux-2.6-microblaze.git] / drivers / mfd / si476x-i2c.c
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  */
36 static 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
98 static inline void si476x_core_schedule_polling_work(struct si476x_core *core)
99 {
100         schedule_delayed_work(&core->status_monitor,
101                               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  */
127 int 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(core->gpio_reset))
134                         gpio_set_value_cansleep(core->gpio_reset, 1);
135
136                 if (client->irq)
137                         enable_irq(client->irq);
138
139                 udelay(100);
140
141                 if (!client->irq) {
142                         atomic_set(&core->is_alive, 1);
143                         si476x_core_schedule_polling_work(core);
144                 }
145         } else {
146                 if (client->irq)
147                         enable_irq(client->irq);
148                 else {
149                         atomic_set(&core->is_alive, 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(&core->is_alive, 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(core->regmap,
177                                    SI476X_PROP_INT_CTL_ENABLE,
178                                    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
191 disable_irq:
192         if (err == -ENODEV)
193                 atomic_set(&core->is_alive, 0);
194
195         if (client->irq)
196                 disable_irq(client->irq);
197         else
198                 cancel_delayed_work_sync(&core->status_monitor);
199
200         if (gpio_is_valid(core->gpio_reset))
201                 gpio_set_value_cansleep(core->gpio_reset, 0);
202
203         return err;
204 }
205 EXPORT_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  */
221 int si476x_core_stop(struct si476x_core *core, bool soft)
222 {
223         int err = 0;
224         atomic_set(&core->is_alive, 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(core->client->irq);
242         else
243                 cancel_delayed_work_sync(&core->status_monitor);
244
245         if (!soft) {
246                 if (gpio_is_valid(core->gpio_reset))
247                         gpio_set_value_cansleep(core->gpio_reset, 0);
248         }
249         return err;
250 }
251 EXPORT_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  */
265 int 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                                                     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;
309 disable_regulators:
310                         err = regulator_bulk_disable(ARRAY_SIZE(core->supplies),
311                                                      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 }
322 EXPORT_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  */
330 static 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(&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  */
343 static 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(&core->rds_fifo_drainer);
349         }
350         mutex_unlock(&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  */
359 static 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
389 unlock:
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  */
403 static 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(&core->is_alive, 0);
408
409         /* Wake up al possible waiting processes */
410         wake_up_interruptible(&core->rds_read_queue);
411
412         atomic_set(&core->cts, 1);
413         wake_up(&core->command);
414
415         atomic_set(&core->stc, 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  */
434 int 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(core->client, buf, count);
442         else
443                 err = i2c_master_recv(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 }
454 EXPORT_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  */
466 static 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  */
483 static 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(&core->cts, 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(&core->stc, 1);
511                 wake_up(&core->tuning);
512         }
513 }
514
515 static 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(&core->is_alive))
522                 si476x_core_schedule_polling_work(core);
523 }
524
525 static 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  */
552 static 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
596 unknown_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  */
618 static 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, info.func,
633                                                        info.firmware.major,
634                                                        info.firmware.minor[0],
635                                                        info.firmware.minor[1]);
636 power_down:
637         si476x_core_set_power_state(core, SI476X_POWER_DOWN);
638 exit:
639         si476x_core_unlock(core);
640
641         return rval;
642 }
643
644 bool 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 }
649 EXPORT_SYMBOL_GPL(si476x_core_has_am);
650
651 bool si476x_core_has_diversity(struct si476x_core *core)
652 {
653         return core->chip_id == SI476X_CHIP_SI4764;
654 }
655 EXPORT_SYMBOL_GPL(si476x_core_has_diversity);
656
657 bool 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 }
663 EXPORT_SYMBOL_GPL(si476x_core_is_a_secondary_tuner);
664
665 bool 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 }
671 EXPORT_SYMBOL_GPL(si476x_core_is_a_primary_tuner);
672
673 bool 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 }
678 EXPORT_SYMBOL_GPL(si476x_core_is_in_am_receiver_mode);
679
680 bool si476x_core_is_powered_up(struct si476x_core *core)
681 {
682         return core->power_state == SI476X_POWER_UP_FULL;
683 }
684 EXPORT_SYMBOL_GPL(si476x_core_is_powered_up);
685
686 static int si476x_core_probe(struct i2c_client *client,
687                              const struct i2c_device_id *id)
688 {
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(&client->dev, 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(core->regmap)) {
703                 rval = PTR_ERR(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, core);
711
712         atomic_set(&core->is_alive, 0);
713         core->power_state = SI476X_POWER_DOWN;
714
715         pdata = dev_get_platdata(&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(pdata->gpio_reset)) {
723                         rval = gpio_request(pdata->gpio_reset, "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(core->gpio_reset, 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(&client->dev,
747                                        ARRAY_SIZE(core->supplies),
748                                        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(&client->dev,
772                                                  client->irq, NULL,
773                                                  si476x_core_interrupt,
774                                                  IRQF_TRIGGER_FALLING |
775                                                  IRQF_ONESHOT,
776                                                  client->name, 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(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(&client->dev,
822                                (client->adapter->nr << 8) + client->addr,
823                                core->cells, cell_num,
824                                NULL, 0, NULL);
825         if (!rval)
826                 return 0;
827
828 free_kfifo:
829         kfifo_free(&core->rds_fifo);
830
831 free_gpio:
832         if (gpio_is_valid(core->gpio_reset))
833                 gpio_free(core->gpio_reset);
834
835         return rval;
836 }
837
838 static int 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(&client->dev);
844
845         if (client->irq)
846                 disable_irq(client->irq);
847         else
848                 cancel_delayed_work_sync(&core->status_monitor);
849
850         kfifo_free(&core->rds_fifo);
851
852         if (gpio_is_valid(core->gpio_reset))
853                 gpio_free(core->gpio_reset);
854
855         return 0;
856 }
857
858
859 static const struct i2c_device_id si476x_id[] = {
860         { "si4761", SI476X_CHIP_SI4761 },
861         { "si4764", SI476X_CHIP_SI4764 },
862         { "si4768", SI476X_CHIP_SI4768 },
863         { },
864 };
865 MODULE_DEVICE_TABLE(i2c, si476x_id);
866
867 static struct i2c_driver si476x_core_driver = {
868         .driver         = {
869                 .name   = "si476x-core",
870         },
871         .probe          = si476x_core_probe,
872         .remove         = si476x_core_remove,
873         .id_table       = si476x_id,
874 };
875 module_i2c_driver(si476x_core_driver);
876
877
878 MODULE_AUTHOR("Andrey Smirnov <andrew.smirnov@gmail.com>");
879 MODULE_DESCRIPTION("Si4761/64/68 AM/FM MFD core device driver");
880 MODULE_LICENSE("GPL");