mfd: Support software initiated shutdown of WM831x PMICs
[linux-2.6.git] / drivers / mfd / ab3100-core.c
1 /*
2  * Copyright (C) 2007-2010 ST-Ericsson
3  * License terms: GNU General Public License (GPL) version 2
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/platform_device.h>
16 #include <linux/device.h>
17 #include <linux/interrupt.h>
18 #include <linux/random.h>
19 #include <linux/debugfs.h>
20 #include <linux/seq_file.h>
21 #include <linux/uaccess.h>
22 #include <linux/mfd/core.h>
23 #include <linux/mfd/abx500.h>
24
25 /* These are the only registers inside AB3100 used in this main file */
26
27 /* Interrupt event registers */
28 #define AB3100_EVENTA1          0x21
29 #define AB3100_EVENTA2          0x22
30 #define AB3100_EVENTA3          0x23
31
32 /* AB3100 DAC converter registers */
33 #define AB3100_DIS              0x00
34 #define AB3100_D0C              0x01
35 #define AB3100_D1C              0x02
36 #define AB3100_D2C              0x03
37 #define AB3100_D3C              0x04
38
39 /* Chip ID register */
40 #define AB3100_CID              0x20
41
42 /* AB3100 interrupt registers */
43 #define AB3100_IMRA1            0x24
44 #define AB3100_IMRA2            0x25
45 #define AB3100_IMRA3            0x26
46 #define AB3100_IMRB1            0x2B
47 #define AB3100_IMRB2            0x2C
48 #define AB3100_IMRB3            0x2D
49
50 /* System Power Monitoring and control registers */
51 #define AB3100_MCA              0x2E
52 #define AB3100_MCB              0x2F
53
54 /* SIM power up */
55 #define AB3100_SUP              0x50
56
57 /*
58  * I2C communication
59  *
60  * The AB3100 is usually assigned address 0x48 (7-bit)
61  * The chip is defined in the platform i2c_board_data section.
62  */
63 static int ab3100_get_chip_id(struct device *dev)
64 {
65         struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
66
67         return (int)ab3100->chip_id;
68 }
69
70 static int ab3100_set_register_interruptible(struct ab3100 *ab3100,
71         u8 reg, u8 regval)
72 {
73         u8 regandval[2] = {reg, regval};
74         int err;
75
76         err = mutex_lock_interruptible(&ab3100->access_mutex);
77         if (err)
78                 return err;
79
80         /*
81          * A two-byte write message with the first byte containing the register
82          * number and the second byte containing the value to be written
83          * effectively sets a register in the AB3100.
84          */
85         err = i2c_master_send(ab3100->i2c_client, regandval, 2);
86         if (err < 0) {
87                 dev_err(ab3100->dev,
88                         "write error (write register): %d\n",
89                         err);
90         } else if (err != 2) {
91                 dev_err(ab3100->dev,
92                         "write error (write register) "
93                         "%d bytes transferred (expected 2)\n",
94                         err);
95                 err = -EIO;
96         } else {
97                 /* All is well */
98                 err = 0;
99         }
100         mutex_unlock(&ab3100->access_mutex);
101         return err;
102 }
103
104 static int set_register_interruptible(struct device *dev,
105         u8 bank, u8 reg, u8 value)
106 {
107         struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
108
109         return ab3100_set_register_interruptible(ab3100, reg, value);
110 }
111
112 /*
113  * The test registers exist at an I2C bus address up one
114  * from the ordinary base. They are not supposed to be used
115  * in production code, but sometimes you have to do that
116  * anyway. It's currently only used from this file so declare
117  * it static and do not export.
118  */
119 static int ab3100_set_test_register_interruptible(struct ab3100 *ab3100,
120                                     u8 reg, u8 regval)
121 {
122         u8 regandval[2] = {reg, regval};
123         int err;
124
125         err = mutex_lock_interruptible(&ab3100->access_mutex);
126         if (err)
127                 return err;
128
129         err = i2c_master_send(ab3100->testreg_client, regandval, 2);
130         if (err < 0) {
131                 dev_err(ab3100->dev,
132                         "write error (write test register): %d\n",
133                         err);
134         } else if (err != 2) {
135                 dev_err(ab3100->dev,
136                         "write error (write test register) "
137                         "%d bytes transferred (expected 2)\n",
138                         err);
139                 err = -EIO;
140         } else {
141                 /* All is well */
142                 err = 0;
143         }
144         mutex_unlock(&ab3100->access_mutex);
145
146         return err;
147 }
148
149 static int ab3100_get_register_interruptible(struct ab3100 *ab3100,
150                                              u8 reg, u8 *regval)
151 {
152         int err;
153
154         err = mutex_lock_interruptible(&ab3100->access_mutex);
155         if (err)
156                 return err;
157
158         /*
159          * AB3100 require an I2C "stop" command between each message, else
160          * it will not work. The only way of achieveing this with the
161          * message transport layer is to send the read and write messages
162          * separately.
163          */
164         err = i2c_master_send(ab3100->i2c_client, &reg, 1);
165         if (err < 0) {
166                 dev_err(ab3100->dev,
167                         "write error (send register address): %d\n",
168                         err);
169                 goto get_reg_out_unlock;
170         } else if (err != 1) {
171                 dev_err(ab3100->dev,
172                         "write error (send register address) "
173                         "%d bytes transferred (expected 1)\n",
174                         err);
175                 err = -EIO;
176                 goto get_reg_out_unlock;
177         } else {
178                 /* All is well */
179                 err = 0;
180         }
181
182         err = i2c_master_recv(ab3100->i2c_client, regval, 1);
183         if (err < 0) {
184                 dev_err(ab3100->dev,
185                         "write error (read register): %d\n",
186                         err);
187                 goto get_reg_out_unlock;
188         } else if (err != 1) {
189                 dev_err(ab3100->dev,
190                         "write error (read register) "
191                         "%d bytes transferred (expected 1)\n",
192                         err);
193                 err = -EIO;
194                 goto get_reg_out_unlock;
195         } else {
196                 /* All is well */
197                 err = 0;
198         }
199
200  get_reg_out_unlock:
201         mutex_unlock(&ab3100->access_mutex);
202         return err;
203 }
204
205 static int get_register_interruptible(struct device *dev, u8 bank, u8 reg,
206                                       u8 *value)
207 {
208         struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
209
210         return ab3100_get_register_interruptible(ab3100, reg, value);
211 }
212
213 static int ab3100_get_register_page_interruptible(struct ab3100 *ab3100,
214                              u8 first_reg, u8 *regvals, u8 numregs)
215 {
216         int err;
217
218         if (ab3100->chip_id == 0xa0 ||
219             ab3100->chip_id == 0xa1)
220                 /* These don't support paged reads */
221                 return -EIO;
222
223         err = mutex_lock_interruptible(&ab3100->access_mutex);
224         if (err)
225                 return err;
226
227         /*
228          * Paged read also require an I2C "stop" command.
229          */
230         err = i2c_master_send(ab3100->i2c_client, &first_reg, 1);
231         if (err < 0) {
232                 dev_err(ab3100->dev,
233                         "write error (send first register address): %d\n",
234                         err);
235                 goto get_reg_page_out_unlock;
236         } else if (err != 1) {
237                 dev_err(ab3100->dev,
238                         "write error (send first register address) "
239                         "%d bytes transferred (expected 1)\n",
240                         err);
241                 err = -EIO;
242                 goto get_reg_page_out_unlock;
243         }
244
245         err = i2c_master_recv(ab3100->i2c_client, regvals, numregs);
246         if (err < 0) {
247                 dev_err(ab3100->dev,
248                         "write error (read register page): %d\n",
249                         err);
250                 goto get_reg_page_out_unlock;
251         } else if (err != numregs) {
252                 dev_err(ab3100->dev,
253                         "write error (read register page) "
254                         "%d bytes transferred (expected %d)\n",
255                         err, numregs);
256                 err = -EIO;
257                 goto get_reg_page_out_unlock;
258         }
259
260         /* All is well */
261         err = 0;
262
263  get_reg_page_out_unlock:
264         mutex_unlock(&ab3100->access_mutex);
265         return err;
266 }
267
268 static int get_register_page_interruptible(struct device *dev, u8 bank,
269         u8 first_reg, u8 *regvals, u8 numregs)
270 {
271         struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
272
273         return ab3100_get_register_page_interruptible(ab3100,
274                         first_reg, regvals, numregs);
275 }
276
277 static int ab3100_mask_and_set_register_interruptible(struct ab3100 *ab3100,
278                                  u8 reg, u8 andmask, u8 ormask)
279 {
280         u8 regandval[2] = {reg, 0};
281         int err;
282
283         err = mutex_lock_interruptible(&ab3100->access_mutex);
284         if (err)
285                 return err;
286
287         /* First read out the target register */
288         err = i2c_master_send(ab3100->i2c_client, &reg, 1);
289         if (err < 0) {
290                 dev_err(ab3100->dev,
291                         "write error (maskset send address): %d\n",
292                         err);
293                 goto get_maskset_unlock;
294         } else if (err != 1) {
295                 dev_err(ab3100->dev,
296                         "write error (maskset send address) "
297                         "%d bytes transferred (expected 1)\n",
298                         err);
299                 err = -EIO;
300                 goto get_maskset_unlock;
301         }
302
303         err = i2c_master_recv(ab3100->i2c_client, &regandval[1], 1);
304         if (err < 0) {
305                 dev_err(ab3100->dev,
306                         "write error (maskset read register): %d\n",
307                         err);
308                 goto get_maskset_unlock;
309         } else if (err != 1) {
310                 dev_err(ab3100->dev,
311                         "write error (maskset read register) "
312                         "%d bytes transferred (expected 1)\n",
313                         err);
314                 err = -EIO;
315                 goto get_maskset_unlock;
316         }
317
318         /* Modify the register */
319         regandval[1] &= andmask;
320         regandval[1] |= ormask;
321
322         /* Write the register */
323         err = i2c_master_send(ab3100->i2c_client, regandval, 2);
324         if (err < 0) {
325                 dev_err(ab3100->dev,
326                         "write error (write register): %d\n",
327                         err);
328                 goto get_maskset_unlock;
329         } else if (err != 2) {
330                 dev_err(ab3100->dev,
331                         "write error (write register) "
332                         "%d bytes transferred (expected 2)\n",
333                         err);
334                 err = -EIO;
335                 goto get_maskset_unlock;
336         }
337
338         /* All is well */
339         err = 0;
340
341  get_maskset_unlock:
342         mutex_unlock(&ab3100->access_mutex);
343         return err;
344 }
345
346 static int mask_and_set_register_interruptible(struct device *dev, u8 bank,
347         u8 reg, u8 bitmask, u8 bitvalues)
348 {
349         struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
350
351         return ab3100_mask_and_set_register_interruptible(ab3100,
352                         reg, bitmask, (bitmask & bitvalues));
353 }
354
355 /*
356  * Register a simple callback for handling any AB3100 events.
357  */
358 int ab3100_event_register(struct ab3100 *ab3100,
359                           struct notifier_block *nb)
360 {
361         return blocking_notifier_chain_register(&ab3100->event_subscribers,
362                                                nb);
363 }
364 EXPORT_SYMBOL(ab3100_event_register);
365
366 /*
367  * Remove a previously registered callback.
368  */
369 int ab3100_event_unregister(struct ab3100 *ab3100,
370                             struct notifier_block *nb)
371 {
372   return blocking_notifier_chain_unregister(&ab3100->event_subscribers,
373                                             nb);
374 }
375 EXPORT_SYMBOL(ab3100_event_unregister);
376
377
378 static int ab3100_event_registers_startup_state_get(struct device *dev,
379                                              u8 *event)
380 {
381         struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
382         if (!ab3100->startup_events_read)
383                 return -EAGAIN; /* Try again later */
384         memcpy(event, ab3100->startup_events, 3);
385         return 0;
386 }
387
388 static struct abx500_ops ab3100_ops = {
389         .get_chip_id = ab3100_get_chip_id,
390         .set_register = set_register_interruptible,
391         .get_register = get_register_interruptible,
392         .get_register_page = get_register_page_interruptible,
393         .set_register_page = NULL,
394         .mask_and_set_register = mask_and_set_register_interruptible,
395         .event_registers_startup_state_get =
396                 ab3100_event_registers_startup_state_get,
397         .startup_irq_enabled = NULL,
398 };
399
400 /*
401  * This is a threaded interrupt handler so we can make some
402  * I2C calls etc.
403  */
404 static irqreturn_t ab3100_irq_handler(int irq, void *data)
405 {
406         struct ab3100 *ab3100 = data;
407         u8 event_regs[3];
408         u32 fatevent;
409         int err;
410
411         add_interrupt_randomness(irq);
412
413         err = ab3100_get_register_page_interruptible(ab3100, AB3100_EVENTA1,
414                                        event_regs, 3);
415         if (err)
416                 goto err_event;
417
418         fatevent = (event_regs[0] << 16) |
419                 (event_regs[1] << 8) |
420                 event_regs[2];
421
422         if (!ab3100->startup_events_read) {
423                 ab3100->startup_events[0] = event_regs[0];
424                 ab3100->startup_events[1] = event_regs[1];
425                 ab3100->startup_events[2] = event_regs[2];
426                 ab3100->startup_events_read = true;
427         }
428         /*
429          * The notified parties will have to mask out the events
430          * they're interested in and react to them. They will be
431          * notified on all events, then they use the fatevent value
432          * to determine if they're interested.
433          */
434         blocking_notifier_call_chain(&ab3100->event_subscribers,
435                                      fatevent, NULL);
436
437         dev_dbg(ab3100->dev,
438                 "IRQ Event: 0x%08x\n", fatevent);
439
440         return IRQ_HANDLED;
441
442  err_event:
443         dev_dbg(ab3100->dev,
444                 "error reading event status\n");
445         return IRQ_HANDLED;
446 }
447
448 #ifdef CONFIG_DEBUG_FS
449 /*
450  * Some debugfs entries only exposed if we're using debug
451  */
452 static int ab3100_registers_print(struct seq_file *s, void *p)
453 {
454         struct ab3100 *ab3100 = s->private;
455         u8 value;
456         u8 reg;
457
458         seq_printf(s, "AB3100 registers:\n");
459
460         for (reg = 0; reg < 0xff; reg++) {
461                 ab3100_get_register_interruptible(ab3100, reg, &value);
462                 seq_printf(s, "[0x%x]:  0x%x\n", reg, value);
463         }
464         return 0;
465 }
466
467 static int ab3100_registers_open(struct inode *inode, struct file *file)
468 {
469         return single_open(file, ab3100_registers_print, inode->i_private);
470 }
471
472 static const struct file_operations ab3100_registers_fops = {
473         .open = ab3100_registers_open,
474         .read = seq_read,
475         .llseek = seq_lseek,
476         .release = single_release,
477         .owner = THIS_MODULE,
478 };
479
480 struct ab3100_get_set_reg_priv {
481         struct ab3100 *ab3100;
482         bool mode;
483 };
484
485 static int ab3100_get_set_reg_open_file(struct inode *inode, struct file *file)
486 {
487         file->private_data = inode->i_private;
488         return 0;
489 }
490
491 static ssize_t ab3100_get_set_reg(struct file *file,
492                                   const char __user *user_buf,
493                                   size_t count, loff_t *ppos)
494 {
495         struct ab3100_get_set_reg_priv *priv = file->private_data;
496         struct ab3100 *ab3100 = priv->ab3100;
497         char buf[32];
498         ssize_t buf_size;
499         int regp;
500         unsigned long user_reg;
501         int err;
502         int i = 0;
503
504         /* Get userspace string and assure termination */
505         buf_size = min(count, (sizeof(buf)-1));
506         if (copy_from_user(buf, user_buf, buf_size))
507                 return -EFAULT;
508         buf[buf_size] = 0;
509
510         /*
511          * The idea is here to parse a string which is either
512          * "0xnn" for reading a register, or "0xaa 0xbb" for
513          * writing 0xbb to the register 0xaa. First move past
514          * whitespace and then begin to parse the register.
515          */
516         while ((i < buf_size) && (buf[i] == ' '))
517                 i++;
518         regp = i;
519
520         /*
521          * Advance pointer to end of string then terminate
522          * the register string. This is needed to satisfy
523          * the strict_strtoul() function.
524          */
525         while ((i < buf_size) && (buf[i] != ' '))
526                 i++;
527         buf[i] = '\0';
528
529         err = strict_strtoul(&buf[regp], 16, &user_reg);
530         if (err)
531                 return err;
532         if (user_reg > 0xff)
533                 return -EINVAL;
534
535         /* Either we read or we write a register here */
536         if (!priv->mode) {
537                 /* Reading */
538                 u8 reg = (u8) user_reg;
539                 u8 regvalue;
540
541                 ab3100_get_register_interruptible(ab3100, reg, &regvalue);
542
543                 dev_info(ab3100->dev,
544                          "debug read AB3100 reg[0x%02x]: 0x%02x\n",
545                          reg, regvalue);
546         } else {
547                 int valp;
548                 unsigned long user_value;
549                 u8 reg = (u8) user_reg;
550                 u8 value;
551                 u8 regvalue;
552
553                 /*
554                  * Writing, we need some value to write to
555                  * the register so keep parsing the string
556                  * from userspace.
557                  */
558                 i++;
559                 while ((i < buf_size) && (buf[i] == ' '))
560                         i++;
561                 valp = i;
562                 while ((i < buf_size) && (buf[i] != ' '))
563                         i++;
564                 buf[i] = '\0';
565
566                 err = strict_strtoul(&buf[valp], 16, &user_value);
567                 if (err)
568                         return err;
569                 if (user_reg > 0xff)
570                         return -EINVAL;
571
572                 value = (u8) user_value;
573                 ab3100_set_register_interruptible(ab3100, reg, value);
574                 ab3100_get_register_interruptible(ab3100, reg, &regvalue);
575
576                 dev_info(ab3100->dev,
577                          "debug write reg[0x%02x] with 0x%02x, "
578                          "after readback: 0x%02x\n",
579                          reg, value, regvalue);
580         }
581         return buf_size;
582 }
583
584 static const struct file_operations ab3100_get_set_reg_fops = {
585         .open = ab3100_get_set_reg_open_file,
586         .write = ab3100_get_set_reg,
587         .llseek = noop_llseek,
588 };
589
590 static struct dentry *ab3100_dir;
591 static struct dentry *ab3100_reg_file;
592 static struct ab3100_get_set_reg_priv ab3100_get_priv;
593 static struct dentry *ab3100_get_reg_file;
594 static struct ab3100_get_set_reg_priv ab3100_set_priv;
595 static struct dentry *ab3100_set_reg_file;
596
597 static void ab3100_setup_debugfs(struct ab3100 *ab3100)
598 {
599         int err;
600
601         ab3100_dir = debugfs_create_dir("ab3100", NULL);
602         if (!ab3100_dir)
603                 goto exit_no_debugfs;
604
605         ab3100_reg_file = debugfs_create_file("registers",
606                                 S_IRUGO, ab3100_dir, ab3100,
607                                 &ab3100_registers_fops);
608         if (!ab3100_reg_file) {
609                 err = -ENOMEM;
610                 goto exit_destroy_dir;
611         }
612
613         ab3100_get_priv.ab3100 = ab3100;
614         ab3100_get_priv.mode = false;
615         ab3100_get_reg_file = debugfs_create_file("get_reg",
616                                 S_IWUSR, ab3100_dir, &ab3100_get_priv,
617                                 &ab3100_get_set_reg_fops);
618         if (!ab3100_get_reg_file) {
619                 err = -ENOMEM;
620                 goto exit_destroy_reg;
621         }
622
623         ab3100_set_priv.ab3100 = ab3100;
624         ab3100_set_priv.mode = true;
625         ab3100_set_reg_file = debugfs_create_file("set_reg",
626                                 S_IWUSR, ab3100_dir, &ab3100_set_priv,
627                                 &ab3100_get_set_reg_fops);
628         if (!ab3100_set_reg_file) {
629                 err = -ENOMEM;
630                 goto exit_destroy_get_reg;
631         }
632         return;
633
634  exit_destroy_get_reg:
635         debugfs_remove(ab3100_get_reg_file);
636  exit_destroy_reg:
637         debugfs_remove(ab3100_reg_file);
638  exit_destroy_dir:
639         debugfs_remove(ab3100_dir);
640  exit_no_debugfs:
641         return;
642 }
643 static inline void ab3100_remove_debugfs(void)
644 {
645         debugfs_remove(ab3100_set_reg_file);
646         debugfs_remove(ab3100_get_reg_file);
647         debugfs_remove(ab3100_reg_file);
648         debugfs_remove(ab3100_dir);
649 }
650 #else
651 static inline void ab3100_setup_debugfs(struct ab3100 *ab3100)
652 {
653 }
654 static inline void ab3100_remove_debugfs(void)
655 {
656 }
657 #endif
658
659 /*
660  * Basic set-up, datastructure creation/destruction and I2C interface.
661  * This sets up a default config in the AB3100 chip so that it
662  * will work as expected.
663  */
664
665 struct ab3100_init_setting {
666         u8 abreg;
667         u8 setting;
668 };
669
670 static const struct ab3100_init_setting __devinitconst
671 ab3100_init_settings[] = {
672         {
673                 .abreg = AB3100_MCA,
674                 .setting = 0x01
675         }, {
676                 .abreg = AB3100_MCB,
677                 .setting = 0x30
678         }, {
679                 .abreg = AB3100_IMRA1,
680                 .setting = 0x00
681         }, {
682                 .abreg = AB3100_IMRA2,
683                 .setting = 0xFF
684         }, {
685                 .abreg = AB3100_IMRA3,
686                 .setting = 0x01
687         }, {
688                 .abreg = AB3100_IMRB1,
689                 .setting = 0xBF
690         }, {
691                 .abreg = AB3100_IMRB2,
692                 .setting = 0xFF
693         }, {
694                 .abreg = AB3100_IMRB3,
695                 .setting = 0xFF
696         }, {
697                 .abreg = AB3100_SUP,
698                 .setting = 0x00
699         }, {
700                 .abreg = AB3100_DIS,
701                 .setting = 0xF0
702         }, {
703                 .abreg = AB3100_D0C,
704                 .setting = 0x00
705         }, {
706                 .abreg = AB3100_D1C,
707                 .setting = 0x00
708         }, {
709                 .abreg = AB3100_D2C,
710                 .setting = 0x00
711         }, {
712                 .abreg = AB3100_D3C,
713                 .setting = 0x00
714         },
715 };
716
717 static int __devinit ab3100_setup(struct ab3100 *ab3100)
718 {
719         int err = 0;
720         int i;
721
722         for (i = 0; i < ARRAY_SIZE(ab3100_init_settings); i++) {
723                 err = ab3100_set_register_interruptible(ab3100,
724                                           ab3100_init_settings[i].abreg,
725                                           ab3100_init_settings[i].setting);
726                 if (err)
727                         goto exit_no_setup;
728         }
729
730         /*
731          * Special trick to make the AB3100 use the 32kHz clock (RTC)
732          * bit 3 in test register 0x02 is a special, undocumented test
733          * register bit that only exist in AB3100 P1E
734          */
735         if (ab3100->chip_id == 0xc4) {
736                 dev_warn(ab3100->dev,
737                          "AB3100 P1E variant detected, "
738                          "forcing chip to 32KHz\n");
739                 err = ab3100_set_test_register_interruptible(ab3100,
740                         0x02, 0x08);
741         }
742
743  exit_no_setup:
744         return err;
745 }
746
747 /* The subdevices of the AB3100 */
748 static struct mfd_cell ab3100_devs[] = {
749         {
750                 .name = "ab3100-dac",
751                 .id = -1,
752         },
753         {
754                 .name = "ab3100-leds",
755                 .id = -1,
756         },
757         {
758                 .name = "ab3100-power",
759                 .id = -1,
760         },
761         {
762                 .name = "ab3100-regulators",
763                 .id = -1,
764         },
765         {
766                 .name = "ab3100-sim",
767                 .id = -1,
768         },
769         {
770                 .name = "ab3100-uart",
771                 .id = -1,
772         },
773         {
774                 .name = "ab3100-rtc",
775                 .id = -1,
776         },
777         {
778                 .name = "ab3100-charger",
779                 .id = -1,
780         },
781         {
782                 .name = "ab3100-boost",
783                 .id = -1,
784         },
785         {
786                 .name = "ab3100-adc",
787                 .id = -1,
788         },
789         {
790                 .name = "ab3100-fuelgauge",
791                 .id = -1,
792         },
793         {
794                 .name = "ab3100-vibrator",
795                 .id = -1,
796         },
797         {
798                 .name = "ab3100-otp",
799                 .id = -1,
800         },
801         {
802                 .name = "ab3100-codec",
803                 .id = -1,
804         },
805 };
806
807 struct ab_family_id {
808         u8      id;
809         char    *name;
810 };
811
812 static const struct ab_family_id ids[] __devinitdata = {
813         /* AB3100 */
814         {
815                 .id = 0xc0,
816                 .name = "P1A"
817         }, {
818                 .id = 0xc1,
819                 .name = "P1B"
820         }, {
821                 .id = 0xc2,
822                 .name = "P1C"
823         }, {
824                 .id = 0xc3,
825                 .name = "P1D"
826         }, {
827                 .id = 0xc4,
828                 .name = "P1E"
829         }, {
830                 .id = 0xc5,
831                 .name = "P1F/R1A"
832         }, {
833                 .id = 0xc6,
834                 .name = "P1G/R1A"
835         }, {
836                 .id = 0xc7,
837                 .name = "P2A/R2A"
838         }, {
839                 .id = 0xc8,
840                 .name = "P2B/R2B"
841         },
842         /* AB3000 variants, not supported */
843         {
844                 .id = 0xa0
845         }, {
846                 .id = 0xa1
847         }, {
848                 .id = 0xa2
849         }, {
850                 .id = 0xa3
851         }, {
852                 .id = 0xa4
853         }, {
854                 .id = 0xa5
855         }, {
856                 .id = 0xa6
857         }, {
858                 .id = 0xa7
859         },
860         /* Terminator */
861         {
862                 .id = 0x00,
863         },
864 };
865
866 static int __devinit ab3100_probe(struct i2c_client *client,
867                                   const struct i2c_device_id *id)
868 {
869         struct ab3100 *ab3100;
870         struct ab3100_platform_data *ab3100_plf_data =
871                 client->dev.platform_data;
872         int err;
873         int i;
874
875         ab3100 = kzalloc(sizeof(struct ab3100), GFP_KERNEL);
876         if (!ab3100) {
877                 dev_err(&client->dev, "could not allocate AB3100 device\n");
878                 return -ENOMEM;
879         }
880
881         /* Initialize data structure */
882         mutex_init(&ab3100->access_mutex);
883         BLOCKING_INIT_NOTIFIER_HEAD(&ab3100->event_subscribers);
884
885         ab3100->i2c_client = client;
886         ab3100->dev = &ab3100->i2c_client->dev;
887
888         i2c_set_clientdata(client, ab3100);
889
890         /* Read chip ID register */
891         err = ab3100_get_register_interruptible(ab3100, AB3100_CID,
892                                                 &ab3100->chip_id);
893         if (err) {
894                 dev_err(&client->dev,
895                         "could not communicate with the AB3100 analog "
896                         "baseband chip\n");
897                 goto exit_no_detect;
898         }
899
900         for (i = 0; ids[i].id != 0x0; i++) {
901                 if (ids[i].id == ab3100->chip_id) {
902                         if (ids[i].name != NULL) {
903                                 snprintf(&ab3100->chip_name[0],
904                                          sizeof(ab3100->chip_name) - 1,
905                                          "AB3100 %s",
906                                          ids[i].name);
907                                 break;
908                         } else {
909                                 dev_err(&client->dev,
910                                         "AB3000 is not supported\n");
911                                 goto exit_no_detect;
912                         }
913                 }
914         }
915
916         if (ids[i].id == 0x0) {
917                 dev_err(&client->dev, "unknown analog baseband chip id: 0x%x\n",
918                         ab3100->chip_id);
919                 dev_err(&client->dev, "accepting it anyway. Please update "
920                         "the driver.\n");
921                 goto exit_no_detect;
922         }
923
924         dev_info(&client->dev, "Detected chip: %s\n",
925                  &ab3100->chip_name[0]);
926
927         /* Attach a second dummy i2c_client to the test register address */
928         ab3100->testreg_client = i2c_new_dummy(client->adapter,
929                                                      client->addr + 1);
930         if (!ab3100->testreg_client) {
931                 err = -ENOMEM;
932                 goto exit_no_testreg_client;
933         }
934
935         err = ab3100_setup(ab3100);
936         if (err)
937                 goto exit_no_setup;
938
939         err = request_threaded_irq(client->irq, NULL, ab3100_irq_handler,
940                                 IRQF_ONESHOT, "ab3100-core", ab3100);
941         /* This real unpredictable IRQ is of course sampled for entropy */
942         rand_initialize_irq(client->irq);
943
944         if (err)
945                 goto exit_no_irq;
946
947         err = abx500_register_ops(&client->dev, &ab3100_ops);
948         if (err)
949                 goto exit_no_ops;
950
951         /* Set up and register the platform devices. */
952         for (i = 0; i < ARRAY_SIZE(ab3100_devs); i++) {
953                 ab3100_devs[i].platform_data = ab3100_plf_data;
954                 ab3100_devs[i].pdata_size = sizeof(struct ab3100_platform_data);
955         }
956
957         err = mfd_add_devices(&client->dev, 0, ab3100_devs,
958                 ARRAY_SIZE(ab3100_devs), NULL, 0);
959
960         ab3100_setup_debugfs(ab3100);
961
962         return 0;
963
964  exit_no_ops:
965  exit_no_irq:
966  exit_no_setup:
967         i2c_unregister_device(ab3100->testreg_client);
968  exit_no_testreg_client:
969  exit_no_detect:
970         kfree(ab3100);
971         return err;
972 }
973
974 static int __devexit ab3100_remove(struct i2c_client *client)
975 {
976         struct ab3100 *ab3100 = i2c_get_clientdata(client);
977
978         /* Unregister subdevices */
979         mfd_remove_devices(&client->dev);
980
981         ab3100_remove_debugfs();
982         i2c_unregister_device(ab3100->testreg_client);
983
984         /*
985          * At this point, all subscribers should have unregistered
986          * their notifiers so deactivate IRQ
987          */
988         free_irq(client->irq, ab3100);
989         kfree(ab3100);
990         return 0;
991 }
992
993 static const struct i2c_device_id ab3100_id[] = {
994         { "ab3100", 0 },
995         { }
996 };
997 MODULE_DEVICE_TABLE(i2c, ab3100_id);
998
999 static struct i2c_driver ab3100_driver = {
1000         .driver = {
1001                 .name   = "ab3100",
1002                 .owner  = THIS_MODULE,
1003         },
1004         .id_table       = ab3100_id,
1005         .probe          = ab3100_probe,
1006         .remove         = __devexit_p(ab3100_remove),
1007 };
1008
1009 static int __init ab3100_i2c_init(void)
1010 {
1011         return i2c_add_driver(&ab3100_driver);
1012 }
1013
1014 static void __exit ab3100_i2c_exit(void)
1015 {
1016         i2c_del_driver(&ab3100_driver);
1017 }
1018
1019 subsys_initcall(ab3100_i2c_init);
1020 module_exit(ab3100_i2c_exit);
1021
1022 MODULE_AUTHOR("Linus Walleij <linus.walleij@stericsson.com>");
1023 MODULE_DESCRIPTION("AB3100 core driver");
1024 MODULE_LICENSE("GPL");