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