GNU Linux-libre 5.10.219-gnu1
[releases.git] / drivers / mfd / ab3100-core.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (C) 2007-2010 ST-Ericsson
4  * Low-level core for exclusive access to the AB3100 IC on the I2C bus
5  * and some basic chip-configuration.
6  * Author: Linus Walleij <linus.walleij@stericsson.com>
7  */
8
9 #include <linux/i2c.h>
10 #include <linux/mutex.h>
11 #include <linux/list.h>
12 #include <linux/notifier.h>
13 #include <linux/slab.h>
14 #include <linux/err.h>
15 #include <linux/init.h>
16 #include <linux/platform_device.h>
17 #include <linux/device.h>
18 #include <linux/interrupt.h>
19 #include <linux/random.h>
20 #include <linux/debugfs.h>
21 #include <linux/seq_file.h>
22 #include <linux/uaccess.h>
23 #include <linux/mfd/core.h>
24 #include <linux/mfd/ab3100.h>
25 #include <linux/mfd/abx500.h>
26
27 /* These are the only registers inside AB3100 used in this main file */
28
29 /* Interrupt event registers */
30 #define AB3100_EVENTA1          0x21
31 #define AB3100_EVENTA2          0x22
32 #define AB3100_EVENTA3          0x23
33
34 /* AB3100 DAC converter registers */
35 #define AB3100_DIS              0x00
36 #define AB3100_D0C              0x01
37 #define AB3100_D1C              0x02
38 #define AB3100_D2C              0x03
39 #define AB3100_D3C              0x04
40
41 /* Chip ID register */
42 #define AB3100_CID              0x20
43
44 /* AB3100 interrupt registers */
45 #define AB3100_IMRA1            0x24
46 #define AB3100_IMRA2            0x25
47 #define AB3100_IMRA3            0x26
48 #define AB3100_IMRB1            0x2B
49 #define AB3100_IMRB2            0x2C
50 #define AB3100_IMRB3            0x2D
51
52 /* System Power Monitoring and control registers */
53 #define AB3100_MCA              0x2E
54 #define AB3100_MCB              0x2F
55
56 /* SIM power up */
57 #define AB3100_SUP              0x50
58
59 /*
60  * I2C communication
61  *
62  * The AB3100 is usually assigned address 0x48 (7-bit)
63  * The chip is defined in the platform i2c_board_data section.
64  */
65 static int ab3100_get_chip_id(struct device *dev)
66 {
67         struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
68
69         return (int)ab3100->chip_id;
70 }
71
72 static int ab3100_set_register_interruptible(struct ab3100 *ab3100,
73         u8 reg, u8 regval)
74 {
75         u8 regandval[2] = {reg, regval};
76         int err;
77
78         err = mutex_lock_interruptible(&ab3100->access_mutex);
79         if (err)
80                 return err;
81
82         /*
83          * A two-byte write message with the first byte containing the register
84          * number and the second byte containing the value to be written
85          * effectively sets a register in the AB3100.
86          */
87         err = i2c_master_send(ab3100->i2c_client, regandval, 2);
88         if (err < 0) {
89                 dev_err(ab3100->dev,
90                         "write error (write register): %d\n",
91                         err);
92         } else if (err != 2) {
93                 dev_err(ab3100->dev,
94                         "write error (write register)\n"
95                         "  %d bytes transferred (expected 2)\n",
96                         err);
97                 err = -EIO;
98         } else {
99                 /* All is well */
100                 err = 0;
101         }
102         mutex_unlock(&ab3100->access_mutex);
103         return err;
104 }
105
106 static int set_register_interruptible(struct device *dev,
107         u8 bank, u8 reg, u8 value)
108 {
109         struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
110
111         return ab3100_set_register_interruptible(ab3100, reg, value);
112 }
113
114 /*
115  * The test registers exist at an I2C bus address up one
116  * from the ordinary base. They are not supposed to be used
117  * in production code, but sometimes you have to do that
118  * anyway. It's currently only used from this file so declare
119  * it static and do not export.
120  */
121 static int ab3100_set_test_register_interruptible(struct ab3100 *ab3100,
122                                     u8 reg, u8 regval)
123 {
124         u8 regandval[2] = {reg, regval};
125         int err;
126
127         err = mutex_lock_interruptible(&ab3100->access_mutex);
128         if (err)
129                 return err;
130
131         err = i2c_master_send(ab3100->testreg_client, regandval, 2);
132         if (err < 0) {
133                 dev_err(ab3100->dev,
134                         "write error (write test register): %d\n",
135                         err);
136         } else if (err != 2) {
137                 dev_err(ab3100->dev,
138                         "write error (write test register)\n"
139                         "  %d bytes transferred (expected 2)\n",
140                         err);
141                 err = -EIO;
142         } else {
143                 /* All is well */
144                 err = 0;
145         }
146         mutex_unlock(&ab3100->access_mutex);
147
148         return err;
149 }
150
151 static int ab3100_get_register_interruptible(struct ab3100 *ab3100,
152                                              u8 reg, u8 *regval)
153 {
154         int err;
155
156         err = mutex_lock_interruptible(&ab3100->access_mutex);
157         if (err)
158                 return err;
159
160         /*
161          * AB3100 require an I2C "stop" command between each message, else
162          * it will not work. The only way of achieveing this with the
163          * message transport layer is to send the read and write messages
164          * separately.
165          */
166         err = i2c_master_send(ab3100->i2c_client, &reg, 1);
167         if (err < 0) {
168                 dev_err(ab3100->dev,
169                         "write error (send register address): %d\n",
170                         err);
171                 goto get_reg_out_unlock;
172         } else if (err != 1) {
173                 dev_err(ab3100->dev,
174                         "write error (send register address)\n"
175                         "  %d bytes transferred (expected 1)\n",
176                         err);
177                 err = -EIO;
178                 goto get_reg_out_unlock;
179         } else {
180                 /* All is well */
181                 err = 0;
182         }
183
184         err = i2c_master_recv(ab3100->i2c_client, regval, 1);
185         if (err < 0) {
186                 dev_err(ab3100->dev,
187                         "write error (read register): %d\n",
188                         err);
189                 goto get_reg_out_unlock;
190         } else if (err != 1) {
191                 dev_err(ab3100->dev,
192                         "write error (read register)\n"
193                         "  %d bytes transferred (expected 1)\n",
194                         err);
195                 err = -EIO;
196                 goto get_reg_out_unlock;
197         } else {
198                 /* All is well */
199                 err = 0;
200         }
201
202  get_reg_out_unlock:
203         mutex_unlock(&ab3100->access_mutex);
204         return err;
205 }
206
207 static int get_register_interruptible(struct device *dev, u8 bank, u8 reg,
208                                       u8 *value)
209 {
210         struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
211
212         return ab3100_get_register_interruptible(ab3100, reg, value);
213 }
214
215 static int ab3100_get_register_page_interruptible(struct ab3100 *ab3100,
216                              u8 first_reg, u8 *regvals, u8 numregs)
217 {
218         int err;
219
220         if (ab3100->chip_id == 0xa0 ||
221             ab3100->chip_id == 0xa1)
222                 /* These don't support paged reads */
223                 return -EIO;
224
225         err = mutex_lock_interruptible(&ab3100->access_mutex);
226         if (err)
227                 return err;
228
229         /*
230          * Paged read also require an I2C "stop" command.
231          */
232         err = i2c_master_send(ab3100->i2c_client, &first_reg, 1);
233         if (err < 0) {
234                 dev_err(ab3100->dev,
235                         "write error (send first register address): %d\n",
236                         err);
237                 goto get_reg_page_out_unlock;
238         } else if (err != 1) {
239                 dev_err(ab3100->dev,
240                         "write error (send first register address)\n"
241                         "  %d bytes transferred (expected 1)\n",
242                         err);
243                 err = -EIO;
244                 goto get_reg_page_out_unlock;
245         }
246
247         err = i2c_master_recv(ab3100->i2c_client, regvals, numregs);
248         if (err < 0) {
249                 dev_err(ab3100->dev,
250                         "write error (read register page): %d\n",
251                         err);
252                 goto get_reg_page_out_unlock;
253         } else if (err != numregs) {
254                 dev_err(ab3100->dev,
255                         "write error (read register page)\n"
256                         "  %d bytes transferred (expected %d)\n",
257                         err, numregs);
258                 err = -EIO;
259                 goto get_reg_page_out_unlock;
260         }
261
262         /* All is well */
263         err = 0;
264
265  get_reg_page_out_unlock:
266         mutex_unlock(&ab3100->access_mutex);
267         return err;
268 }
269
270 static int get_register_page_interruptible(struct device *dev, u8 bank,
271         u8 first_reg, u8 *regvals, u8 numregs)
272 {
273         struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
274
275         return ab3100_get_register_page_interruptible(ab3100,
276                         first_reg, regvals, numregs);
277 }
278
279 static int ab3100_mask_and_set_register_interruptible(struct ab3100 *ab3100,
280                                  u8 reg, u8 andmask, u8 ormask)
281 {
282         u8 regandval[2] = {reg, 0};
283         int err;
284
285         err = mutex_lock_interruptible(&ab3100->access_mutex);
286         if (err)
287                 return err;
288
289         /* First read out the target register */
290         err = i2c_master_send(ab3100->i2c_client, &reg, 1);
291         if (err < 0) {
292                 dev_err(ab3100->dev,
293                         "write error (maskset send address): %d\n",
294                         err);
295                 goto get_maskset_unlock;
296         } else if (err != 1) {
297                 dev_err(ab3100->dev,
298                         "write error (maskset send address)\n"
299                         "  %d bytes transferred (expected 1)\n",
300                         err);
301                 err = -EIO;
302                 goto get_maskset_unlock;
303         }
304
305         err = i2c_master_recv(ab3100->i2c_client, &regandval[1], 1);
306         if (err < 0) {
307                 dev_err(ab3100->dev,
308                         "write error (maskset read register): %d\n",
309                         err);
310                 goto get_maskset_unlock;
311         } else if (err != 1) {
312                 dev_err(ab3100->dev,
313                         "write error (maskset read register)\n"
314                         "  %d bytes transferred (expected 1)\n",
315                         err);
316                 err = -EIO;
317                 goto get_maskset_unlock;
318         }
319
320         /* Modify the register */
321         regandval[1] &= andmask;
322         regandval[1] |= ormask;
323
324         /* Write the register */
325         err = i2c_master_send(ab3100->i2c_client, regandval, 2);
326         if (err < 0) {
327                 dev_err(ab3100->dev,
328                         "write error (write register): %d\n",
329                         err);
330                 goto get_maskset_unlock;
331         } else if (err != 2) {
332                 dev_err(ab3100->dev,
333                         "write error (write register)\n"
334                         "  %d bytes transferred (expected 2)\n",
335                         err);
336                 err = -EIO;
337                 goto get_maskset_unlock;
338         }
339
340         /* All is well */
341         err = 0;
342
343  get_maskset_unlock:
344         mutex_unlock(&ab3100->access_mutex);
345         return err;
346 }
347
348 static int mask_and_set_register_interruptible(struct device *dev, u8 bank,
349         u8 reg, u8 bitmask, u8 bitvalues)
350 {
351         struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
352
353         return ab3100_mask_and_set_register_interruptible(ab3100,
354                         reg, bitmask, (bitmask & bitvalues));
355 }
356
357 /*
358  * Register a simple callback for handling any AB3100 events.
359  */
360 int ab3100_event_register(struct ab3100 *ab3100,
361                           struct notifier_block *nb)
362 {
363         return blocking_notifier_chain_register(&ab3100->event_subscribers,
364                                                nb);
365 }
366 EXPORT_SYMBOL(ab3100_event_register);
367
368 /*
369  * Remove a previously registered callback.
370  */
371 int ab3100_event_unregister(struct ab3100 *ab3100,
372                             struct notifier_block *nb)
373 {
374         return blocking_notifier_chain_unregister(&ab3100->event_subscribers,
375                                             nb);
376 }
377 EXPORT_SYMBOL(ab3100_event_unregister);
378
379
380 static int ab3100_event_registers_startup_state_get(struct device *dev,
381                                              u8 *event)
382 {
383         struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
384
385         if (!ab3100->startup_events_read)
386                 return -EAGAIN; /* Try again later */
387         memcpy(event, ab3100->startup_events, 3);
388
389         return 0;
390 }
391
392 static struct abx500_ops ab3100_ops = {
393         .get_chip_id = ab3100_get_chip_id,
394         .set_register = set_register_interruptible,
395         .get_register = get_register_interruptible,
396         .get_register_page = get_register_page_interruptible,
397         .set_register_page = NULL,
398         .mask_and_set_register = mask_and_set_register_interruptible,
399         .event_registers_startup_state_get =
400                 ab3100_event_registers_startup_state_get,
401         .startup_irq_enabled = NULL,
402 };
403
404 /*
405  * This is a threaded interrupt handler so we can make some
406  * I2C calls etc.
407  */
408 static irqreturn_t ab3100_irq_handler(int irq, void *data)
409 {
410         struct ab3100 *ab3100 = data;
411         u8 event_regs[3];
412         u32 fatevent;
413         int err;
414
415         err = ab3100_get_register_page_interruptible(ab3100, AB3100_EVENTA1,
416                                        event_regs, 3);
417         if (err)
418                 goto err_event;
419
420         fatevent = (event_regs[0] << 16) |
421                 (event_regs[1] << 8) |
422                 event_regs[2];
423
424         if (!ab3100->startup_events_read) {
425                 ab3100->startup_events[0] = event_regs[0];
426                 ab3100->startup_events[1] = event_regs[1];
427                 ab3100->startup_events[2] = event_regs[2];
428                 ab3100->startup_events_read = true;
429         }
430         /*
431          * The notified parties will have to mask out the events
432          * they're interested in and react to them. They will be
433          * notified on all events, then they use the fatevent value
434          * to determine if they're interested.
435          */
436         blocking_notifier_call_chain(&ab3100->event_subscribers,
437                                      fatevent, NULL);
438
439         dev_dbg(ab3100->dev,
440                 "IRQ Event: 0x%08x\n", fatevent);
441
442         return IRQ_HANDLED;
443
444  err_event:
445         dev_dbg(ab3100->dev,
446                 "error reading event status\n");
447         return IRQ_HANDLED;
448 }
449
450 #ifdef CONFIG_DEBUG_FS
451 /*
452  * Some debugfs entries only exposed if we're using debug
453  */
454 static int ab3100_registers_print(struct seq_file *s, void *p)
455 {
456         struct ab3100 *ab3100 = s->private;
457         u8 value;
458         u8 reg;
459
460         seq_puts(s, "AB3100 registers:\n");
461
462         for (reg = 0; reg < 0xff; reg++) {
463                 ab3100_get_register_interruptible(ab3100, reg, &value);
464                 seq_printf(s, "[0x%x]:  0x%x\n", reg, value);
465         }
466         return 0;
467 }
468
469 static int ab3100_registers_open(struct inode *inode, struct file *file)
470 {
471         return single_open(file, ab3100_registers_print, inode->i_private);
472 }
473
474 static const struct file_operations ab3100_registers_fops = {
475         .open = ab3100_registers_open,
476         .read = seq_read,
477         .llseek = seq_lseek,
478         .release = single_release,
479         .owner = THIS_MODULE,
480 };
481
482 struct ab3100_get_set_reg_priv {
483         struct ab3100 *ab3100;
484         bool mode;
485 };
486
487 static ssize_t ab3100_get_set_reg(struct file *file,
488                                   const char __user *user_buf,
489                                   size_t count, loff_t *ppos)
490 {
491         struct ab3100_get_set_reg_priv *priv = file->private_data;
492         struct ab3100 *ab3100 = priv->ab3100;
493         char buf[32];
494         ssize_t buf_size;
495         int regp;
496         u8 user_reg;
497         int err;
498         int i = 0;
499
500         /* Get userspace string and assure termination */
501         buf_size = min((ssize_t)count, (ssize_t)(sizeof(buf)-1));
502         if (copy_from_user(buf, user_buf, buf_size))
503                 return -EFAULT;
504         buf[buf_size] = 0;
505
506         /*
507          * The idea is here to parse a string which is either
508          * "0xnn" for reading a register, or "0xaa 0xbb" for
509          * writing 0xbb to the register 0xaa. First move past
510          * whitespace and then begin to parse the register.
511          */
512         while ((i < buf_size) && (buf[i] == ' '))
513                 i++;
514         regp = i;
515
516         /*
517          * Advance pointer to end of string then terminate
518          * the register string. This is needed to satisfy
519          * the kstrtou8() function.
520          */
521         while ((i < buf_size) && (buf[i] != ' '))
522                 i++;
523         buf[i] = '\0';
524
525         err = kstrtou8(&buf[regp], 16, &user_reg);
526         if (err)
527                 return err;
528
529         /* Either we read or we write a register here */
530         if (!priv->mode) {
531                 /* Reading */
532                 u8 regvalue;
533
534                 ab3100_get_register_interruptible(ab3100, user_reg, &regvalue);
535
536                 dev_info(ab3100->dev,
537                          "debug read AB3100 reg[0x%02x]: 0x%02x\n",
538                          user_reg, regvalue);
539         } else {
540                 int valp;
541                 u8 user_value;
542                 u8 regvalue;
543
544                 /*
545                  * Writing, we need some value to write to
546                  * the register so keep parsing the string
547                  * from userspace.
548                  */
549                 i++;
550                 while ((i < buf_size) && (buf[i] == ' '))
551                         i++;
552                 valp = i;
553                 while ((i < buf_size) && (buf[i] != ' '))
554                         i++;
555                 buf[i] = '\0';
556
557                 err = kstrtou8(&buf[valp], 16, &user_value);
558                 if (err)
559                         return err;
560
561                 ab3100_set_register_interruptible(ab3100, user_reg, user_value);
562                 ab3100_get_register_interruptible(ab3100, user_reg, &regvalue);
563
564                 dev_info(ab3100->dev,
565                          "debug write reg[0x%02x]\n"
566                          "  with 0x%02x, after readback: 0x%02x\n",
567                          user_reg, user_value, regvalue);
568         }
569         return buf_size;
570 }
571
572 static const struct file_operations ab3100_get_set_reg_fops = {
573         .open = simple_open,
574         .write = ab3100_get_set_reg,
575         .llseek = noop_llseek,
576 };
577
578 static struct ab3100_get_set_reg_priv ab3100_get_priv;
579 static struct ab3100_get_set_reg_priv ab3100_set_priv;
580
581 static void ab3100_setup_debugfs(struct ab3100 *ab3100)
582 {
583         struct dentry *ab3100_dir;
584
585         ab3100_dir = debugfs_create_dir("ab3100", NULL);
586
587         debugfs_create_file("registers", S_IRUGO, ab3100_dir, ab3100,
588                             &ab3100_registers_fops);
589
590         ab3100_get_priv.ab3100 = ab3100;
591         ab3100_get_priv.mode = false;
592         debugfs_create_file("get_reg", S_IWUSR, ab3100_dir, &ab3100_get_priv,
593                             &ab3100_get_set_reg_fops);
594
595         ab3100_set_priv.ab3100 = ab3100;
596         ab3100_set_priv.mode = true;
597         debugfs_create_file("set_reg", S_IWUSR, ab3100_dir, &ab3100_set_priv,
598                             &ab3100_get_set_reg_fops);
599 }
600 #else
601 static inline void ab3100_setup_debugfs(struct ab3100 *ab3100)
602 {
603 }
604 #endif
605
606 /*
607  * Basic set-up, datastructure creation/destruction and I2C interface.
608  * This sets up a default config in the AB3100 chip so that it
609  * will work as expected.
610  */
611
612 struct ab3100_init_setting {
613         u8 abreg;
614         u8 setting;
615 };
616
617 static const struct ab3100_init_setting ab3100_init_settings[] = {
618         {
619                 .abreg = AB3100_MCA,
620                 .setting = 0x01
621         }, {
622                 .abreg = AB3100_MCB,
623                 .setting = 0x30
624         }, {
625                 .abreg = AB3100_IMRA1,
626                 .setting = 0x00
627         }, {
628                 .abreg = AB3100_IMRA2,
629                 .setting = 0xFF
630         }, {
631                 .abreg = AB3100_IMRA3,
632                 .setting = 0x01
633         }, {
634                 .abreg = AB3100_IMRB1,
635                 .setting = 0xBF
636         }, {
637                 .abreg = AB3100_IMRB2,
638                 .setting = 0xFF
639         }, {
640                 .abreg = AB3100_IMRB3,
641                 .setting = 0xFF
642         }, {
643                 .abreg = AB3100_SUP,
644                 .setting = 0x00
645         }, {
646                 .abreg = AB3100_DIS,
647                 .setting = 0xF0
648         }, {
649                 .abreg = AB3100_D0C,
650                 .setting = 0x00
651         }, {
652                 .abreg = AB3100_D1C,
653                 .setting = 0x00
654         }, {
655                 .abreg = AB3100_D2C,
656                 .setting = 0x00
657         }, {
658                 .abreg = AB3100_D3C,
659                 .setting = 0x00
660         },
661 };
662
663 static int ab3100_setup(struct ab3100 *ab3100)
664 {
665         int err = 0;
666         int i;
667
668         for (i = 0; i < ARRAY_SIZE(ab3100_init_settings); i++) {
669                 err = ab3100_set_register_interruptible(ab3100,
670                                           ab3100_init_settings[i].abreg,
671                                           ab3100_init_settings[i].setting);
672                 if (err)
673                         goto exit_no_setup;
674         }
675
676         /*
677          * Special trick to make the AB3100 use the 32kHz clock (RTC)
678          * bit 3 in test register 0x02 is a special, undocumented test
679          * register bit that only exist in AB3100 P1E
680          */
681         if (ab3100->chip_id == 0xc4) {
682                 dev_warn(ab3100->dev,
683                          "AB3100 P1E variant detected forcing chip to 32KHz\n");
684                 err = ab3100_set_test_register_interruptible(ab3100,
685                         0x02, 0x08);
686         }
687
688  exit_no_setup:
689         return err;
690 }
691
692 /* The subdevices of the AB3100 */
693 static struct mfd_cell ab3100_devs[] = {
694         {
695                 .name = "ab3100-dac",
696                 .id = -1,
697         },
698         {
699                 .name = "ab3100-leds",
700                 .id = -1,
701         },
702         {
703                 .name = "ab3100-power",
704                 .id = -1,
705         },
706         {
707                 .name = "ab3100-regulators",
708                 .of_compatible = "stericsson,ab3100-regulators",
709                 .id = -1,
710         },
711         {
712                 .name = "ab3100-sim",
713                 .id = -1,
714         },
715         {
716                 .name = "ab3100-uart",
717                 .id = -1,
718         },
719         {
720                 .name = "ab3100-rtc",
721                 .id = -1,
722         },
723         {
724                 .name = "ab3100-charger",
725                 .id = -1,
726         },
727         {
728                 .name = "ab3100-boost",
729                 .id = -1,
730         },
731         {
732                 .name = "ab3100-adc",
733                 .id = -1,
734         },
735         {
736                 .name = "ab3100-fuelgauge",
737                 .id = -1,
738         },
739         {
740                 .name = "ab3100-vibrator",
741                 .id = -1,
742         },
743         {
744                 .name = "ab3100-otp",
745                 .id = -1,
746         },
747         {
748                 .name = "ab3100-codec",
749                 .id = -1,
750         },
751 };
752
753 struct ab_family_id {
754         u8      id;
755         char    *name;
756 };
757
758 static const struct ab_family_id ids[] = {
759         /* AB3100 */
760         {
761                 .id = 0xc0,
762                 .name = "P1A"
763         }, {
764                 .id = 0xc1,
765                 .name = "P1B"
766         }, {
767                 .id = 0xc2,
768                 .name = "P1C"
769         }, {
770                 .id = 0xc3,
771                 .name = "P1D"
772         }, {
773                 .id = 0xc4,
774                 .name = "P1E"
775         }, {
776                 .id = 0xc5,
777                 .name = "P1F/R1A"
778         }, {
779                 .id = 0xc6,
780                 .name = "P1G/R1A"
781         }, {
782                 .id = 0xc7,
783                 .name = "P2A/R2A"
784         }, {
785                 .id = 0xc8,
786                 .name = "P2B/R2B"
787         },
788         /* AB3000 variants, not supported */
789         {
790                 .id = 0xa0
791         }, {
792                 .id = 0xa1
793         }, {
794                 .id = 0xa2
795         }, {
796                 .id = 0xa3
797         }, {
798                 .id = 0xa4
799         }, {
800                 .id = 0xa5
801         }, {
802                 .id = 0xa6
803         }, {
804                 .id = 0xa7
805         },
806         /* Terminator */
807         {
808                 .id = 0x00,
809         },
810 };
811
812 static int ab3100_probe(struct i2c_client *client,
813                                   const struct i2c_device_id *id)
814 {
815         struct ab3100 *ab3100;
816         struct ab3100_platform_data *ab3100_plf_data =
817                 dev_get_platdata(&client->dev);
818         int err;
819         int i;
820
821         ab3100 = devm_kzalloc(&client->dev, sizeof(struct ab3100), GFP_KERNEL);
822         if (!ab3100)
823                 return -ENOMEM;
824
825         /* Initialize data structure */
826         mutex_init(&ab3100->access_mutex);
827         BLOCKING_INIT_NOTIFIER_HEAD(&ab3100->event_subscribers);
828
829         ab3100->i2c_client = client;
830         ab3100->dev = &ab3100->i2c_client->dev;
831
832         i2c_set_clientdata(client, ab3100);
833
834         /* Read chip ID register */
835         err = ab3100_get_register_interruptible(ab3100, AB3100_CID,
836                                                 &ab3100->chip_id);
837         if (err) {
838                 dev_err(&client->dev,
839                         "failed to communicate with AB3100 chip\n");
840                 goto exit_no_detect;
841         }
842
843         for (i = 0; ids[i].id != 0x0; i++) {
844                 if (ids[i].id == ab3100->chip_id) {
845                         if (ids[i].name)
846                                 break;
847
848                         dev_err(&client->dev, "AB3000 is not supported\n");
849                         goto exit_no_detect;
850                 }
851         }
852
853         snprintf(&ab3100->chip_name[0],
854                  sizeof(ab3100->chip_name) - 1, "AB3100 %s", ids[i].name);
855
856         if (ids[i].id == 0x0) {
857                 dev_err(&client->dev, "unknown analog baseband chip id: 0x%x\n",
858                         ab3100->chip_id);
859                 dev_err(&client->dev,
860                         "accepting it anyway. Please update the driver.\n");
861                 goto exit_no_detect;
862         }
863
864         dev_info(&client->dev, "Detected chip: %s\n",
865                  &ab3100->chip_name[0]);
866
867         /* Attach a second dummy i2c_client to the test register address */
868         ab3100->testreg_client = i2c_new_dummy_device(client->adapter,
869                                                client->addr + 1);
870         if (IS_ERR(ab3100->testreg_client)) {
871                 err = PTR_ERR(ab3100->testreg_client);
872                 goto exit_no_testreg_client;
873         }
874
875         err = ab3100_setup(ab3100);
876         if (err)
877                 goto exit_no_setup;
878
879         err = devm_request_threaded_irq(&client->dev,
880                                         client->irq, NULL, ab3100_irq_handler,
881                                         IRQF_ONESHOT, "ab3100-core", ab3100);
882         if (err)
883                 goto exit_no_irq;
884
885         err = abx500_register_ops(&client->dev, &ab3100_ops);
886         if (err)
887                 goto exit_no_ops;
888
889         /* Set up and register the platform devices. */
890         for (i = 0; i < ARRAY_SIZE(ab3100_devs); i++) {
891                 ab3100_devs[i].platform_data = ab3100_plf_data;
892                 ab3100_devs[i].pdata_size = sizeof(struct ab3100_platform_data);
893         }
894
895         err = mfd_add_devices(&client->dev, 0, ab3100_devs,
896                               ARRAY_SIZE(ab3100_devs), NULL, 0, NULL);
897
898         ab3100_setup_debugfs(ab3100);
899
900         return 0;
901
902  exit_no_ops:
903  exit_no_irq:
904  exit_no_setup:
905         i2c_unregister_device(ab3100->testreg_client);
906  exit_no_testreg_client:
907  exit_no_detect:
908         return err;
909 }
910
911 static const struct i2c_device_id ab3100_id[] = {
912         { "ab3100", 0 },
913         { }
914 };
915
916 static struct i2c_driver ab3100_driver = {
917         .driver = {
918                 .name                   = "ab3100",
919                 .suppress_bind_attrs    = true,
920         },
921         .id_table       = ab3100_id,
922         .probe          = ab3100_probe,
923 };
924
925 static int __init ab3100_i2c_init(void)
926 {
927         return i2c_add_driver(&ab3100_driver);
928 }
929 subsys_initcall(ab3100_i2c_init);