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/init.h>
16 #include <linux/platform_device.h>
17 #include <linux/device.h>
18 #include <linux/interrupt.h>
19 #include <linux/random.h>
20 #include <linux/debugfs.h>
21 #include <linux/seq_file.h>
22 #include <linux/uaccess.h>
23 #include <linux/mfd/core.h>
24 #include <linux/mfd/ab3100.h>
25 #include <linux/mfd/abx500.h>
26
27 /* These are the only registers inside AB3100 used in this main file */
28
29 /* Interrupt event registers */
30 #define AB3100_EVENTA1 0x21
31 #define AB3100_EVENTA2 0x22
32 #define AB3100_EVENTA3 0x23
33
34 /* AB3100 DAC converter registers */
35 #define AB3100_DIS 0x00
36 #define AB3100_D0C 0x01
37 #define AB3100_D1C 0x02
38 #define AB3100_D2C 0x03
39 #define AB3100_D3C 0x04
40
41 /* Chip ID register */
42 #define AB3100_CID 0x20
43
44 /* AB3100 interrupt registers */
45 #define AB3100_IMRA1 0x24
46 #define AB3100_IMRA2 0x25
47 #define AB3100_IMRA3 0x26
48 #define AB3100_IMRB1 0x2B
49 #define AB3100_IMRB2 0x2C
50 #define AB3100_IMRB3 0x2D
51
52 /* System Power Monitoring and control registers */
53 #define AB3100_MCA 0x2E
54 #define AB3100_MCB 0x2F
55
56 /* SIM power up */
57 #define AB3100_SUP 0x50
58
59 /*
60 * I2C communication
61 *
62 * The AB3100 is usually assigned address 0x48 (7-bit)
63 * The chip is defined in the platform i2c_board_data section.
64 */
ab3100_get_chip_id(struct device * dev)65 static int ab3100_get_chip_id(struct device *dev)
66 {
67 struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
68
69 return (int)ab3100->chip_id;
70 }
71
ab3100_set_register_interruptible(struct ab3100 * ab3100,u8 reg,u8 regval)72 static int ab3100_set_register_interruptible(struct ab3100 *ab3100,
73 u8 reg, u8 regval)
74 {
75 u8 regandval[2] = {reg, regval};
76 int err;
77
78 err = mutex_lock_interruptible(&ab3100->access_mutex);
79 if (err)
80 return err;
81
82 /*
83 * A two-byte write message with the first byte containing the register
84 * number and the second byte containing the value to be written
85 * effectively sets a register in the AB3100.
86 */
87 err = i2c_master_send(ab3100->i2c_client, regandval, 2);
88 if (err < 0) {
89 dev_err(ab3100->dev,
90 "write error (write register): %d\n",
91 err);
92 } else if (err != 2) {
93 dev_err(ab3100->dev,
94 "write error (write register)\n"
95 " %d bytes transferred (expected 2)\n",
96 err);
97 err = -EIO;
98 } else {
99 /* All is well */
100 err = 0;
101 }
102 mutex_unlock(&ab3100->access_mutex);
103 return err;
104 }
105
set_register_interruptible(struct device * dev,u8 bank,u8 reg,u8 value)106 static int set_register_interruptible(struct device *dev,
107 u8 bank, u8 reg, u8 value)
108 {
109 struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
110
111 return ab3100_set_register_interruptible(ab3100, reg, value);
112 }
113
114 /*
115 * The test registers exist at an I2C bus address up one
116 * from the ordinary base. They are not supposed to be used
117 * in production code, but sometimes you have to do that
118 * anyway. It's currently only used from this file so declare
119 * it static and do not export.
120 */
ab3100_set_test_register_interruptible(struct ab3100 * ab3100,u8 reg,u8 regval)121 static int ab3100_set_test_register_interruptible(struct ab3100 *ab3100,
122 u8 reg, u8 regval)
123 {
124 u8 regandval[2] = {reg, regval};
125 int err;
126
127 err = mutex_lock_interruptible(&ab3100->access_mutex);
128 if (err)
129 return err;
130
131 err = i2c_master_send(ab3100->testreg_client, regandval, 2);
132 if (err < 0) {
133 dev_err(ab3100->dev,
134 "write error (write test register): %d\n",
135 err);
136 } else if (err != 2) {
137 dev_err(ab3100->dev,
138 "write error (write test register)\n"
139 " %d bytes transferred (expected 2)\n",
140 err);
141 err = -EIO;
142 } else {
143 /* All is well */
144 err = 0;
145 }
146 mutex_unlock(&ab3100->access_mutex);
147
148 return err;
149 }
150
ab3100_get_register_interruptible(struct ab3100 * ab3100,u8 reg,u8 * regval)151 static int ab3100_get_register_interruptible(struct ab3100 *ab3100,
152 u8 reg, u8 *regval)
153 {
154 int err;
155
156 err = mutex_lock_interruptible(&ab3100->access_mutex);
157 if (err)
158 return err;
159
160 /*
161 * AB3100 require an I2C "stop" command between each message, else
162 * it will not work. The only way of achieveing this with the
163 * message transport layer is to send the read and write messages
164 * separately.
165 */
166 err = i2c_master_send(ab3100->i2c_client, ®, 1);
167 if (err < 0) {
168 dev_err(ab3100->dev,
169 "write error (send register address): %d\n",
170 err);
171 goto get_reg_out_unlock;
172 } else if (err != 1) {
173 dev_err(ab3100->dev,
174 "write error (send register address)\n"
175 " %d bytes transferred (expected 1)\n",
176 err);
177 err = -EIO;
178 goto get_reg_out_unlock;
179 } else {
180 /* All is well */
181 err = 0;
182 }
183
184 err = i2c_master_recv(ab3100->i2c_client, regval, 1);
185 if (err < 0) {
186 dev_err(ab3100->dev,
187 "write error (read register): %d\n",
188 err);
189 goto get_reg_out_unlock;
190 } else if (err != 1) {
191 dev_err(ab3100->dev,
192 "write error (read register)\n"
193 " %d bytes transferred (expected 1)\n",
194 err);
195 err = -EIO;
196 goto get_reg_out_unlock;
197 } else {
198 /* All is well */
199 err = 0;
200 }
201
202 get_reg_out_unlock:
203 mutex_unlock(&ab3100->access_mutex);
204 return err;
205 }
206
get_register_interruptible(struct device * dev,u8 bank,u8 reg,u8 * value)207 static int get_register_interruptible(struct device *dev, u8 bank, u8 reg,
208 u8 *value)
209 {
210 struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
211
212 return ab3100_get_register_interruptible(ab3100, reg, value);
213 }
214
ab3100_get_register_page_interruptible(struct ab3100 * ab3100,u8 first_reg,u8 * regvals,u8 numregs)215 static int ab3100_get_register_page_interruptible(struct ab3100 *ab3100,
216 u8 first_reg, u8 *regvals, u8 numregs)
217 {
218 int err;
219
220 if (ab3100->chip_id == 0xa0 ||
221 ab3100->chip_id == 0xa1)
222 /* These don't support paged reads */
223 return -EIO;
224
225 err = mutex_lock_interruptible(&ab3100->access_mutex);
226 if (err)
227 return err;
228
229 /*
230 * Paged read also require an I2C "stop" command.
231 */
232 err = i2c_master_send(ab3100->i2c_client, &first_reg, 1);
233 if (err < 0) {
234 dev_err(ab3100->dev,
235 "write error (send first register address): %d\n",
236 err);
237 goto get_reg_page_out_unlock;
238 } else if (err != 1) {
239 dev_err(ab3100->dev,
240 "write error (send first register address)\n"
241 " %d bytes transferred (expected 1)\n",
242 err);
243 err = -EIO;
244 goto get_reg_page_out_unlock;
245 }
246
247 err = i2c_master_recv(ab3100->i2c_client, regvals, numregs);
248 if (err < 0) {
249 dev_err(ab3100->dev,
250 "write error (read register page): %d\n",
251 err);
252 goto get_reg_page_out_unlock;
253 } else if (err != numregs) {
254 dev_err(ab3100->dev,
255 "write error (read register page)\n"
256 " %d bytes transferred (expected %d)\n",
257 err, numregs);
258 err = -EIO;
259 goto get_reg_page_out_unlock;
260 }
261
262 /* All is well */
263 err = 0;
264
265 get_reg_page_out_unlock:
266 mutex_unlock(&ab3100->access_mutex);
267 return err;
268 }
269
get_register_page_interruptible(struct device * dev,u8 bank,u8 first_reg,u8 * regvals,u8 numregs)270 static int get_register_page_interruptible(struct device *dev, u8 bank,
271 u8 first_reg, u8 *regvals, u8 numregs)
272 {
273 struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
274
275 return ab3100_get_register_page_interruptible(ab3100,
276 first_reg, regvals, numregs);
277 }
278
ab3100_mask_and_set_register_interruptible(struct ab3100 * ab3100,u8 reg,u8 andmask,u8 ormask)279 static int ab3100_mask_and_set_register_interruptible(struct ab3100 *ab3100,
280 u8 reg, u8 andmask, u8 ormask)
281 {
282 u8 regandval[2] = {reg, 0};
283 int err;
284
285 err = mutex_lock_interruptible(&ab3100->access_mutex);
286 if (err)
287 return err;
288
289 /* First read out the target register */
290 err = i2c_master_send(ab3100->i2c_client, ®, 1);
291 if (err < 0) {
292 dev_err(ab3100->dev,
293 "write error (maskset send address): %d\n",
294 err);
295 goto get_maskset_unlock;
296 } else if (err != 1) {
297 dev_err(ab3100->dev,
298 "write error (maskset send address)\n"
299 " %d bytes transferred (expected 1)\n",
300 err);
301 err = -EIO;
302 goto get_maskset_unlock;
303 }
304
305 err = i2c_master_recv(ab3100->i2c_client, ®andval[1], 1);
306 if (err < 0) {
307 dev_err(ab3100->dev,
308 "write error (maskset read register): %d\n",
309 err);
310 goto get_maskset_unlock;
311 } else if (err != 1) {
312 dev_err(ab3100->dev,
313 "write error (maskset read register)\n"
314 " %d bytes transferred (expected 1)\n",
315 err);
316 err = -EIO;
317 goto get_maskset_unlock;
318 }
319
320 /* Modify the register */
321 regandval[1] &= andmask;
322 regandval[1] |= ormask;
323
324 /* Write the register */
325 err = i2c_master_send(ab3100->i2c_client, regandval, 2);
326 if (err < 0) {
327 dev_err(ab3100->dev,
328 "write error (write register): %d\n",
329 err);
330 goto get_maskset_unlock;
331 } else if (err != 2) {
332 dev_err(ab3100->dev,
333 "write error (write register)\n"
334 " %d bytes transferred (expected 2)\n",
335 err);
336 err = -EIO;
337 goto get_maskset_unlock;
338 }
339
340 /* All is well */
341 err = 0;
342
343 get_maskset_unlock:
344 mutex_unlock(&ab3100->access_mutex);
345 return err;
346 }
347
mask_and_set_register_interruptible(struct device * dev,u8 bank,u8 reg,u8 bitmask,u8 bitvalues)348 static int mask_and_set_register_interruptible(struct device *dev, u8 bank,
349 u8 reg, u8 bitmask, u8 bitvalues)
350 {
351 struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
352
353 return ab3100_mask_and_set_register_interruptible(ab3100,
354 reg, bitmask, (bitmask & bitvalues));
355 }
356
357 /*
358 * Register a simple callback for handling any AB3100 events.
359 */
ab3100_event_register(struct ab3100 * ab3100,struct notifier_block * nb)360 int ab3100_event_register(struct ab3100 *ab3100,
361 struct notifier_block *nb)
362 {
363 return blocking_notifier_chain_register(&ab3100->event_subscribers,
364 nb);
365 }
366 EXPORT_SYMBOL(ab3100_event_register);
367
368 /*
369 * Remove a previously registered callback.
370 */
ab3100_event_unregister(struct ab3100 * ab3100,struct notifier_block * nb)371 int ab3100_event_unregister(struct ab3100 *ab3100,
372 struct notifier_block *nb)
373 {
374 return blocking_notifier_chain_unregister(&ab3100->event_subscribers,
375 nb);
376 }
377 EXPORT_SYMBOL(ab3100_event_unregister);
378
379
ab3100_event_registers_startup_state_get(struct device * dev,u8 * event)380 static int ab3100_event_registers_startup_state_get(struct device *dev,
381 u8 *event)
382 {
383 struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
384
385 if (!ab3100->startup_events_read)
386 return -EAGAIN; /* Try again later */
387 memcpy(event, ab3100->startup_events, 3);
388
389 return 0;
390 }
391
392 static struct abx500_ops ab3100_ops = {
393 .get_chip_id = ab3100_get_chip_id,
394 .set_register = set_register_interruptible,
395 .get_register = get_register_interruptible,
396 .get_register_page = get_register_page_interruptible,
397 .set_register_page = NULL,
398 .mask_and_set_register = mask_and_set_register_interruptible,
399 .event_registers_startup_state_get =
400 ab3100_event_registers_startup_state_get,
401 .startup_irq_enabled = NULL,
402 };
403
404 /*
405 * This is a threaded interrupt handler so we can make some
406 * I2C calls etc.
407 */
ab3100_irq_handler(int irq,void * data)408 static irqreturn_t ab3100_irq_handler(int irq, void *data)
409 {
410 struct ab3100 *ab3100 = data;
411 u8 event_regs[3];
412 u32 fatevent;
413 int err;
414
415 err = ab3100_get_register_page_interruptible(ab3100, AB3100_EVENTA1,
416 event_regs, 3);
417 if (err)
418 goto err_event;
419
420 fatevent = (event_regs[0] << 16) |
421 (event_regs[1] << 8) |
422 event_regs[2];
423
424 if (!ab3100->startup_events_read) {
425 ab3100->startup_events[0] = event_regs[0];
426 ab3100->startup_events[1] = event_regs[1];
427 ab3100->startup_events[2] = event_regs[2];
428 ab3100->startup_events_read = true;
429 }
430 /*
431 * The notified parties will have to mask out the events
432 * they're interested in and react to them. They will be
433 * notified on all events, then they use the fatevent value
434 * to determine if they're interested.
435 */
436 blocking_notifier_call_chain(&ab3100->event_subscribers,
437 fatevent, NULL);
438
439 dev_dbg(ab3100->dev,
440 "IRQ Event: 0x%08x\n", fatevent);
441
442 return IRQ_HANDLED;
443
444 err_event:
445 dev_dbg(ab3100->dev,
446 "error reading event status\n");
447 return IRQ_HANDLED;
448 }
449
450 #ifdef CONFIG_DEBUG_FS
451 /*
452 * Some debugfs entries only exposed if we're using debug
453 */
ab3100_registers_print(struct seq_file * s,void * p)454 static int ab3100_registers_print(struct seq_file *s, void *p)
455 {
456 struct ab3100 *ab3100 = s->private;
457 u8 value;
458 u8 reg;
459
460 seq_puts(s, "AB3100 registers:\n");
461
462 for (reg = 0; reg < 0xff; reg++) {
463 ab3100_get_register_interruptible(ab3100, reg, &value);
464 seq_printf(s, "[0x%x]: 0x%x\n", reg, value);
465 }
466 return 0;
467 }
468
ab3100_registers_open(struct inode * inode,struct file * file)469 static int ab3100_registers_open(struct inode *inode, struct file *file)
470 {
471 return single_open(file, ab3100_registers_print, inode->i_private);
472 }
473
474 static const struct file_operations ab3100_registers_fops = {
475 .open = ab3100_registers_open,
476 .read = seq_read,
477 .llseek = seq_lseek,
478 .release = single_release,
479 .owner = THIS_MODULE,
480 };
481
482 struct ab3100_get_set_reg_priv {
483 struct ab3100 *ab3100;
484 bool mode;
485 };
486
ab3100_get_set_reg(struct file * file,const char __user * user_buf,size_t count,loff_t * ppos)487 static ssize_t ab3100_get_set_reg(struct file *file,
488 const char __user *user_buf,
489 size_t count, loff_t *ppos)
490 {
491 struct ab3100_get_set_reg_priv *priv = file->private_data;
492 struct ab3100 *ab3100 = priv->ab3100;
493 char buf[32];
494 ssize_t buf_size;
495 int regp;
496 u8 user_reg;
497 int err;
498 int i = 0;
499
500 /* Get userspace string and assure termination */
501 buf_size = min(count, (sizeof(buf)-1));
502 if (copy_from_user(buf, user_buf, buf_size))
503 return -EFAULT;
504 buf[buf_size] = 0;
505
506 /*
507 * The idea is here to parse a string which is either
508 * "0xnn" for reading a register, or "0xaa 0xbb" for
509 * writing 0xbb to the register 0xaa. First move past
510 * whitespace and then begin to parse the register.
511 */
512 while ((i < buf_size) && (buf[i] == ' '))
513 i++;
514 regp = i;
515
516 /*
517 * Advance pointer to end of string then terminate
518 * the register string. This is needed to satisfy
519 * the kstrtou8() function.
520 */
521 while ((i < buf_size) && (buf[i] != ' '))
522 i++;
523 buf[i] = '\0';
524
525 err = kstrtou8(&buf[regp], 16, &user_reg);
526 if (err)
527 return err;
528
529 /* Either we read or we write a register here */
530 if (!priv->mode) {
531 /* Reading */
532 u8 regvalue;
533
534 ab3100_get_register_interruptible(ab3100, user_reg, ®value);
535
536 dev_info(ab3100->dev,
537 "debug read AB3100 reg[0x%02x]: 0x%02x\n",
538 user_reg, regvalue);
539 } else {
540 int valp;
541 u8 user_value;
542 u8 regvalue;
543
544 /*
545 * Writing, we need some value to write to
546 * the register so keep parsing the string
547 * from userspace.
548 */
549 i++;
550 while ((i < buf_size) && (buf[i] == ' '))
551 i++;
552 valp = i;
553 while ((i < buf_size) && (buf[i] != ' '))
554 i++;
555 buf[i] = '\0';
556
557 err = kstrtou8(&buf[valp], 16, &user_value);
558 if (err)
559 return err;
560
561 ab3100_set_register_interruptible(ab3100, user_reg, user_value);
562 ab3100_get_register_interruptible(ab3100, user_reg, ®value);
563
564 dev_info(ab3100->dev,
565 "debug write reg[0x%02x]\n"
566 " with 0x%02x, after readback: 0x%02x\n",
567 user_reg, user_value, regvalue);
568 }
569 return buf_size;
570 }
571
572 static const struct file_operations ab3100_get_set_reg_fops = {
573 .open = simple_open,
574 .write = ab3100_get_set_reg,
575 .llseek = noop_llseek,
576 };
577
578 static struct dentry *ab3100_dir;
579 static struct dentry *ab3100_reg_file;
580 static struct ab3100_get_set_reg_priv ab3100_get_priv;
581 static struct dentry *ab3100_get_reg_file;
582 static struct ab3100_get_set_reg_priv ab3100_set_priv;
583 static struct dentry *ab3100_set_reg_file;
584
ab3100_setup_debugfs(struct ab3100 * ab3100)585 static void ab3100_setup_debugfs(struct ab3100 *ab3100)
586 {
587 int err;
588
589 ab3100_dir = debugfs_create_dir("ab3100", NULL);
590 if (!ab3100_dir)
591 goto exit_no_debugfs;
592
593 ab3100_reg_file = debugfs_create_file("registers",
594 S_IRUGO, ab3100_dir, ab3100,
595 &ab3100_registers_fops);
596 if (!ab3100_reg_file) {
597 err = -ENOMEM;
598 goto exit_destroy_dir;
599 }
600
601 ab3100_get_priv.ab3100 = ab3100;
602 ab3100_get_priv.mode = false;
603 ab3100_get_reg_file = debugfs_create_file("get_reg",
604 S_IWUSR, ab3100_dir, &ab3100_get_priv,
605 &ab3100_get_set_reg_fops);
606 if (!ab3100_get_reg_file) {
607 err = -ENOMEM;
608 goto exit_destroy_reg;
609 }
610
611 ab3100_set_priv.ab3100 = ab3100;
612 ab3100_set_priv.mode = true;
613 ab3100_set_reg_file = debugfs_create_file("set_reg",
614 S_IWUSR, ab3100_dir, &ab3100_set_priv,
615 &ab3100_get_set_reg_fops);
616 if (!ab3100_set_reg_file) {
617 err = -ENOMEM;
618 goto exit_destroy_get_reg;
619 }
620 return;
621
622 exit_destroy_get_reg:
623 debugfs_remove(ab3100_get_reg_file);
624 exit_destroy_reg:
625 debugfs_remove(ab3100_reg_file);
626 exit_destroy_dir:
627 debugfs_remove(ab3100_dir);
628 exit_no_debugfs:
629 return;
630 }
631 #else
ab3100_setup_debugfs(struct ab3100 * ab3100)632 static inline void ab3100_setup_debugfs(struct ab3100 *ab3100)
633 {
634 }
635 #endif
636
637 /*
638 * Basic set-up, datastructure creation/destruction and I2C interface.
639 * This sets up a default config in the AB3100 chip so that it
640 * will work as expected.
641 */
642
643 struct ab3100_init_setting {
644 u8 abreg;
645 u8 setting;
646 };
647
648 static const struct ab3100_init_setting ab3100_init_settings[] = {
649 {
650 .abreg = AB3100_MCA,
651 .setting = 0x01
652 }, {
653 .abreg = AB3100_MCB,
654 .setting = 0x30
655 }, {
656 .abreg = AB3100_IMRA1,
657 .setting = 0x00
658 }, {
659 .abreg = AB3100_IMRA2,
660 .setting = 0xFF
661 }, {
662 .abreg = AB3100_IMRA3,
663 .setting = 0x01
664 }, {
665 .abreg = AB3100_IMRB1,
666 .setting = 0xBF
667 }, {
668 .abreg = AB3100_IMRB2,
669 .setting = 0xFF
670 }, {
671 .abreg = AB3100_IMRB3,
672 .setting = 0xFF
673 }, {
674 .abreg = AB3100_SUP,
675 .setting = 0x00
676 }, {
677 .abreg = AB3100_DIS,
678 .setting = 0xF0
679 }, {
680 .abreg = AB3100_D0C,
681 .setting = 0x00
682 }, {
683 .abreg = AB3100_D1C,
684 .setting = 0x00
685 }, {
686 .abreg = AB3100_D2C,
687 .setting = 0x00
688 }, {
689 .abreg = AB3100_D3C,
690 .setting = 0x00
691 },
692 };
693
ab3100_setup(struct ab3100 * ab3100)694 static int ab3100_setup(struct ab3100 *ab3100)
695 {
696 int err = 0;
697 int i;
698
699 for (i = 0; i < ARRAY_SIZE(ab3100_init_settings); i++) {
700 err = ab3100_set_register_interruptible(ab3100,
701 ab3100_init_settings[i].abreg,
702 ab3100_init_settings[i].setting);
703 if (err)
704 goto exit_no_setup;
705 }
706
707 /*
708 * Special trick to make the AB3100 use the 32kHz clock (RTC)
709 * bit 3 in test register 0x02 is a special, undocumented test
710 * register bit that only exist in AB3100 P1E
711 */
712 if (ab3100->chip_id == 0xc4) {
713 dev_warn(ab3100->dev,
714 "AB3100 P1E variant detected forcing chip to 32KHz\n");
715 err = ab3100_set_test_register_interruptible(ab3100,
716 0x02, 0x08);
717 }
718
719 exit_no_setup:
720 return err;
721 }
722
723 /* The subdevices of the AB3100 */
724 static struct mfd_cell ab3100_devs[] = {
725 {
726 .name = "ab3100-dac",
727 .id = -1,
728 },
729 {
730 .name = "ab3100-leds",
731 .id = -1,
732 },
733 {
734 .name = "ab3100-power",
735 .id = -1,
736 },
737 {
738 .name = "ab3100-regulators",
739 .of_compatible = "stericsson,ab3100-regulators",
740 .id = -1,
741 },
742 {
743 .name = "ab3100-sim",
744 .id = -1,
745 },
746 {
747 .name = "ab3100-uart",
748 .id = -1,
749 },
750 {
751 .name = "ab3100-rtc",
752 .id = -1,
753 },
754 {
755 .name = "ab3100-charger",
756 .id = -1,
757 },
758 {
759 .name = "ab3100-boost",
760 .id = -1,
761 },
762 {
763 .name = "ab3100-adc",
764 .id = -1,
765 },
766 {
767 .name = "ab3100-fuelgauge",
768 .id = -1,
769 },
770 {
771 .name = "ab3100-vibrator",
772 .id = -1,
773 },
774 {
775 .name = "ab3100-otp",
776 .id = -1,
777 },
778 {
779 .name = "ab3100-codec",
780 .id = -1,
781 },
782 };
783
784 struct ab_family_id {
785 u8 id;
786 char *name;
787 };
788
789 static const struct ab_family_id ids[] = {
790 /* AB3100 */
791 {
792 .id = 0xc0,
793 .name = "P1A"
794 }, {
795 .id = 0xc1,
796 .name = "P1B"
797 }, {
798 .id = 0xc2,
799 .name = "P1C"
800 }, {
801 .id = 0xc3,
802 .name = "P1D"
803 }, {
804 .id = 0xc4,
805 .name = "P1E"
806 }, {
807 .id = 0xc5,
808 .name = "P1F/R1A"
809 }, {
810 .id = 0xc6,
811 .name = "P1G/R1A"
812 }, {
813 .id = 0xc7,
814 .name = "P2A/R2A"
815 }, {
816 .id = 0xc8,
817 .name = "P2B/R2B"
818 },
819 /* AB3000 variants, not supported */
820 {
821 .id = 0xa0
822 }, {
823 .id = 0xa1
824 }, {
825 .id = 0xa2
826 }, {
827 .id = 0xa3
828 }, {
829 .id = 0xa4
830 }, {
831 .id = 0xa5
832 }, {
833 .id = 0xa6
834 }, {
835 .id = 0xa7
836 },
837 /* Terminator */
838 {
839 .id = 0x00,
840 },
841 };
842
ab3100_probe(struct i2c_client * client,const struct i2c_device_id * id)843 static int ab3100_probe(struct i2c_client *client,
844 const struct i2c_device_id *id)
845 {
846 struct ab3100 *ab3100;
847 struct ab3100_platform_data *ab3100_plf_data =
848 dev_get_platdata(&client->dev);
849 int err;
850 int i;
851
852 ab3100 = devm_kzalloc(&client->dev, sizeof(struct ab3100), GFP_KERNEL);
853 if (!ab3100)
854 return -ENOMEM;
855
856 /* Initialize data structure */
857 mutex_init(&ab3100->access_mutex);
858 BLOCKING_INIT_NOTIFIER_HEAD(&ab3100->event_subscribers);
859
860 ab3100->i2c_client = client;
861 ab3100->dev = &ab3100->i2c_client->dev;
862
863 i2c_set_clientdata(client, ab3100);
864
865 /* Read chip ID register */
866 err = ab3100_get_register_interruptible(ab3100, AB3100_CID,
867 &ab3100->chip_id);
868 if (err) {
869 dev_err(&client->dev,
870 "failed to communicate with AB3100 chip\n");
871 goto exit_no_detect;
872 }
873
874 for (i = 0; ids[i].id != 0x0; i++) {
875 if (ids[i].id == ab3100->chip_id) {
876 if (ids[i].name)
877 break;
878
879 dev_err(&client->dev, "AB3000 is not supported\n");
880 goto exit_no_detect;
881 }
882 }
883
884 snprintf(&ab3100->chip_name[0],
885 sizeof(ab3100->chip_name) - 1, "AB3100 %s", ids[i].name);
886
887 if (ids[i].id == 0x0) {
888 dev_err(&client->dev, "unknown analog baseband chip id: 0x%x\n",
889 ab3100->chip_id);
890 dev_err(&client->dev,
891 "accepting it anyway. Please update the driver.\n");
892 goto exit_no_detect;
893 }
894
895 dev_info(&client->dev, "Detected chip: %s\n",
896 &ab3100->chip_name[0]);
897
898 /* Attach a second dummy i2c_client to the test register address */
899 ab3100->testreg_client = i2c_new_dummy(client->adapter,
900 client->addr + 1);
901 if (!ab3100->testreg_client) {
902 err = -ENOMEM;
903 goto exit_no_testreg_client;
904 }
905
906 err = ab3100_setup(ab3100);
907 if (err)
908 goto exit_no_setup;
909
910 err = devm_request_threaded_irq(&client->dev,
911 client->irq, NULL, ab3100_irq_handler,
912 IRQF_ONESHOT, "ab3100-core", ab3100);
913 if (err)
914 goto exit_no_irq;
915
916 err = abx500_register_ops(&client->dev, &ab3100_ops);
917 if (err)
918 goto exit_no_ops;
919
920 /* Set up and register the platform devices. */
921 for (i = 0; i < ARRAY_SIZE(ab3100_devs); i++) {
922 ab3100_devs[i].platform_data = ab3100_plf_data;
923 ab3100_devs[i].pdata_size = sizeof(struct ab3100_platform_data);
924 }
925
926 err = mfd_add_devices(&client->dev, 0, ab3100_devs,
927 ARRAY_SIZE(ab3100_devs), NULL, 0, NULL);
928
929 ab3100_setup_debugfs(ab3100);
930
931 return 0;
932
933 exit_no_ops:
934 exit_no_irq:
935 exit_no_setup:
936 i2c_unregister_device(ab3100->testreg_client);
937 exit_no_testreg_client:
938 exit_no_detect:
939 return err;
940 }
941
942 static const struct i2c_device_id ab3100_id[] = {
943 { "ab3100", 0 },
944 { }
945 };
946
947 static struct i2c_driver ab3100_driver = {
948 .driver = {
949 .name = "ab3100",
950 .suppress_bind_attrs = true,
951 },
952 .id_table = ab3100_id,
953 .probe = ab3100_probe,
954 };
955
ab3100_i2c_init(void)956 static int __init ab3100_i2c_init(void)
957 {
958 return i2c_add_driver(&ab3100_driver);
959 }
960 subsys_initcall(ab3100_i2c_init);
961
