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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 */
64static 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
71static 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
105static 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 */
120static 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
150static 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, ®, 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
206static 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
214static 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
269static 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
278static 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, ®, 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, ®andval[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
347static 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 */
359int ab3100_event_register(struct ab3100 *ab3100,
360 struct notifier_block *nb)
361{
362 return blocking_notifier_chain_register(&ab3100->event_subscribers,
363 nb);
364}
365EXPORT_SYMBOL(ab3100_event_register);
366
367/*
368 * Remove a previously registered callback.
369 */
370int ab3100_event_unregister(struct ab3100 *ab3100,
371 struct notifier_block *nb)
372{
373 return blocking_notifier_chain_unregister(&ab3100->event_subscribers,
374 nb);
375}
376EXPORT_SYMBOL(ab3100_event_unregister);
377
378
379static 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
389static 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 */
405static 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 */
451static 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
466static int ab3100_registers_open(struct inode *inode, struct file *file)
467{
468 return single_open(file, ab3100_registers_print, inode->i_private);
469}
470
471static 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
479struct ab3100_get_set_reg_priv {
480 struct ab3100 *ab3100;
481 bool mode;
482};
483
484static 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, ®value);
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, ®value);
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
577static 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
583static struct dentry *ab3100_dir;
584static struct dentry *ab3100_reg_file;
585static struct ab3100_get_set_reg_priv ab3100_get_priv;
586static struct dentry *ab3100_get_reg_file;
587static struct ab3100_get_set_reg_priv ab3100_set_priv;
588static struct dentry *ab3100_set_reg_file;
589
590static 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}
636static 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
644static inline void ab3100_setup_debugfs(struct ab3100 *ab3100)
645{
646}
647static 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
658struct ab3100_init_setting {
659 u8 abreg;
660 u8 setting;
661};
662
663static const struct ab3100_init_setting __devinitconst
664ab3100_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
710static 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 */
741static 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
800struct ab_family_id {
801 u8 id;
802 char *name;
803};
804
805static 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
859static 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
964static 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
983static const struct i2c_device_id ab3100_id[] = {
984 { "ab3100", 0 },
985 { }
986};
987MODULE_DEVICE_TABLE(i2c, ab3100_id);
988
989static 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
999static int __init ab3100_i2c_init(void)
1000{
1001 return i2c_add_driver(&ab3100_driver);
1002}
1003
1004static void __exit ab3100_i2c_exit(void)
1005{
1006 i2c_del_driver(&ab3100_driver);
1007}
1008
1009subsys_initcall(ab3100_i2c_init);
1010module_exit(ab3100_i2c_exit);
1011
1012MODULE_AUTHOR("Linus Walleij <linus.walleij@stericsson.com>");
1013MODULE_DESCRIPTION("AB3100 core driver");
1014MODULE_LICENSE("GPL");