blob: 66379b413906a3ed5147370040ed7ccffd0b5068 [file] [log] [blame]
Linus Walleij14fa5692009-05-21 23:17:06 +02001/*
Linus Walleij2071db42010-01-19 11:41:52 +01002 * Copyright (C) 2007-2010 ST-Ericsson
Linus Walleij14fa5692009-05-21 23:17:06 +02003 * 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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090013#include <linux/slab.h>
Linus Walleij14fa5692009-05-21 23:17:06 +020014#include <linux/err.h>
15#include <linux/platform_device.h>
16#include <linux/device.h>
17#include <linux/interrupt.h>
Linus Walleij2071db42010-01-19 11:41:52 +010018#include <linux/random.h>
Linus Walleij14fa5692009-05-21 23:17:06 +020019#include <linux/debugfs.h>
20#include <linux/seq_file.h>
21#include <linux/uaccess.h>
Linus Walleij812f9e92010-05-01 18:26:07 +020022#include <linux/mfd/abx500.h>
Linus Walleij14fa5692009-05-21 23:17:06 +020023
24/* These are the only registers inside AB3100 used in this main file */
25
26/* Interrupt event registers */
27#define AB3100_EVENTA1 0x21
28#define AB3100_EVENTA2 0x22
29#define AB3100_EVENTA3 0x23
30
31/* AB3100 DAC converter registers */
32#define AB3100_DIS 0x00
33#define AB3100_D0C 0x01
34#define AB3100_D1C 0x02
35#define AB3100_D2C 0x03
36#define AB3100_D3C 0x04
37
38/* Chip ID register */
39#define AB3100_CID 0x20
40
41/* AB3100 interrupt registers */
42#define AB3100_IMRA1 0x24
43#define AB3100_IMRA2 0x25
44#define AB3100_IMRA3 0x26
45#define AB3100_IMRB1 0x2B
46#define AB3100_IMRB2 0x2C
47#define AB3100_IMRB3 0x2D
48
49/* System Power Monitoring and control registers */
50#define AB3100_MCA 0x2E
51#define AB3100_MCB 0x2F
52
53/* SIM power up */
54#define AB3100_SUP 0x50
55
56/*
57 * I2C communication
58 *
59 * The AB3100 is usually assigned address 0x48 (7-bit)
60 * The chip is defined in the platform i2c_board_data section.
61 */
Mattias Wallinfa661252010-05-01 18:26:20 +020062static int ab3100_get_chip_id(struct device *dev)
Linus Walleij14fa5692009-05-21 23:17:06 +020063{
Mattias Wallinfa661252010-05-01 18:26:20 +020064 struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
Linus Walleij14fa5692009-05-21 23:17:06 +020065
Mattias Wallinfa661252010-05-01 18:26:20 +020066 return (int)ab3100->chip_id;
Linus Walleij14fa5692009-05-21 23:17:06 +020067}
Linus Walleij14fa5692009-05-21 23:17:06 +020068
Mattias Wallinfa661252010-05-01 18:26:20 +020069static int ab3100_set_register_interruptible(struct ab3100 *ab3100,
70 u8 reg, u8 regval)
Linus Walleij14fa5692009-05-21 23:17:06 +020071{
72 u8 regandval[2] = {reg, regval};
73 int err;
74
75 err = mutex_lock_interruptible(&ab3100->access_mutex);
76 if (err)
77 return err;
78
79 /*
80 * A two-byte write message with the first byte containing the register
81 * number and the second byte containing the value to be written
82 * effectively sets a register in the AB3100.
83 */
84 err = i2c_master_send(ab3100->i2c_client, regandval, 2);
85 if (err < 0) {
86 dev_err(ab3100->dev,
87 "write error (write register): %d\n",
88 err);
89 } else if (err != 2) {
90 dev_err(ab3100->dev,
91 "write error (write register) "
92 "%d bytes transferred (expected 2)\n",
93 err);
94 err = -EIO;
95 } else {
96 /* All is well */
97 err = 0;
98 }
99 mutex_unlock(&ab3100->access_mutex);
Linus Walleij7cdc2b92009-08-13 11:49:38 +0200100 return err;
Linus Walleij14fa5692009-05-21 23:17:06 +0200101}
Linus Walleij956f25a2009-08-13 11:49:23 +0200102
Mattias Wallinfa661252010-05-01 18:26:20 +0200103static int set_register_interruptible(struct device *dev,
104 u8 bank, u8 reg, u8 value)
105{
106 struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
107
108 return ab3100_set_register_interruptible(ab3100, reg, value);
109}
Linus Walleij14fa5692009-05-21 23:17:06 +0200110
111/*
112 * The test registers exist at an I2C bus address up one
113 * from the ordinary base. They are not supposed to be used
114 * in production code, but sometimes you have to do that
115 * anyway. It's currently only used from this file so declare
116 * it static and do not export.
117 */
Linus Walleij956f25a2009-08-13 11:49:23 +0200118static int ab3100_set_test_register_interruptible(struct ab3100 *ab3100,
Linus Walleij14fa5692009-05-21 23:17:06 +0200119 u8 reg, u8 regval)
120{
121 u8 regandval[2] = {reg, regval};
122 int err;
123
124 err = mutex_lock_interruptible(&ab3100->access_mutex);
125 if (err)
126 return err;
127
128 err = i2c_master_send(ab3100->testreg_client, regandval, 2);
129 if (err < 0) {
130 dev_err(ab3100->dev,
131 "write error (write test register): %d\n",
132 err);
133 } else if (err != 2) {
134 dev_err(ab3100->dev,
135 "write error (write test register) "
136 "%d bytes transferred (expected 2)\n",
137 err);
138 err = -EIO;
139 } else {
140 /* All is well */
141 err = 0;
142 }
143 mutex_unlock(&ab3100->access_mutex);
144
145 return err;
146}
147
Mattias Wallinfa661252010-05-01 18:26:20 +0200148static int ab3100_get_register_interruptible(struct ab3100 *ab3100,
149 u8 reg, u8 *regval)
Linus Walleij14fa5692009-05-21 23:17:06 +0200150{
151 int err;
152
153 err = mutex_lock_interruptible(&ab3100->access_mutex);
154 if (err)
155 return err;
156
157 /*
158 * AB3100 require an I2C "stop" command between each message, else
159 * it will not work. The only way of achieveing this with the
160 * message transport layer is to send the read and write messages
161 * separately.
162 */
163 err = i2c_master_send(ab3100->i2c_client, &reg, 1);
164 if (err < 0) {
165 dev_err(ab3100->dev,
166 "write error (send register address): %d\n",
167 err);
168 goto get_reg_out_unlock;
169 } else if (err != 1) {
170 dev_err(ab3100->dev,
171 "write error (send register address) "
172 "%d bytes transferred (expected 1)\n",
173 err);
174 err = -EIO;
175 goto get_reg_out_unlock;
176 } else {
177 /* All is well */
178 err = 0;
179 }
180
181 err = i2c_master_recv(ab3100->i2c_client, regval, 1);
182 if (err < 0) {
183 dev_err(ab3100->dev,
184 "write error (read register): %d\n",
185 err);
186 goto get_reg_out_unlock;
187 } else if (err != 1) {
188 dev_err(ab3100->dev,
189 "write error (read register) "
190 "%d bytes transferred (expected 1)\n",
191 err);
192 err = -EIO;
193 goto get_reg_out_unlock;
194 } else {
195 /* All is well */
196 err = 0;
197 }
198
199 get_reg_out_unlock:
200 mutex_unlock(&ab3100->access_mutex);
201 return err;
202}
Linus Walleij14fa5692009-05-21 23:17:06 +0200203
Mattias Wallinfa661252010-05-01 18:26:20 +0200204static int get_register_interruptible(struct device *dev, u8 bank, u8 reg,
205 u8 *value)
206{
207 struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
Linus Walleij956f25a2009-08-13 11:49:23 +0200208
Mattias Wallinfa661252010-05-01 18:26:20 +0200209 return ab3100_get_register_interruptible(ab3100, reg, value);
210}
211
212static int ab3100_get_register_page_interruptible(struct ab3100 *ab3100,
Linus Walleij14fa5692009-05-21 23:17:06 +0200213 u8 first_reg, u8 *regvals, u8 numregs)
214{
215 int err;
216
217 if (ab3100->chip_id == 0xa0 ||
218 ab3100->chip_id == 0xa1)
219 /* These don't support paged reads */
220 return -EIO;
221
222 err = mutex_lock_interruptible(&ab3100->access_mutex);
223 if (err)
224 return err;
225
226 /*
227 * Paged read also require an I2C "stop" command.
228 */
229 err = i2c_master_send(ab3100->i2c_client, &first_reg, 1);
230 if (err < 0) {
231 dev_err(ab3100->dev,
232 "write error (send first register address): %d\n",
233 err);
234 goto get_reg_page_out_unlock;
235 } else if (err != 1) {
236 dev_err(ab3100->dev,
237 "write error (send first register address) "
238 "%d bytes transferred (expected 1)\n",
239 err);
240 err = -EIO;
241 goto get_reg_page_out_unlock;
242 }
243
244 err = i2c_master_recv(ab3100->i2c_client, regvals, numregs);
245 if (err < 0) {
246 dev_err(ab3100->dev,
247 "write error (read register page): %d\n",
248 err);
249 goto get_reg_page_out_unlock;
250 } else if (err != numregs) {
251 dev_err(ab3100->dev,
252 "write error (read register page) "
253 "%d bytes transferred (expected %d)\n",
254 err, numregs);
255 err = -EIO;
256 goto get_reg_page_out_unlock;
257 }
258
259 /* All is well */
260 err = 0;
261
262 get_reg_page_out_unlock:
263 mutex_unlock(&ab3100->access_mutex);
264 return err;
265}
Linus Walleij14fa5692009-05-21 23:17:06 +0200266
Mattias Wallinfa661252010-05-01 18:26:20 +0200267static int get_register_page_interruptible(struct device *dev, u8 bank,
268 u8 first_reg, u8 *regvals, u8 numregs)
269{
270 struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
Linus Walleij956f25a2009-08-13 11:49:23 +0200271
Mattias Wallinfa661252010-05-01 18:26:20 +0200272 return ab3100_get_register_page_interruptible(ab3100,
273 first_reg, regvals, numregs);
274}
275
276static int ab3100_mask_and_set_register_interruptible(struct ab3100 *ab3100,
Linus Walleij14fa5692009-05-21 23:17:06 +0200277 u8 reg, u8 andmask, u8 ormask)
278{
279 u8 regandval[2] = {reg, 0};
280 int err;
281
282 err = mutex_lock_interruptible(&ab3100->access_mutex);
283 if (err)
284 return err;
285
286 /* First read out the target register */
287 err = i2c_master_send(ab3100->i2c_client, &reg, 1);
288 if (err < 0) {
289 dev_err(ab3100->dev,
290 "write error (maskset send address): %d\n",
291 err);
292 goto get_maskset_unlock;
293 } else if (err != 1) {
294 dev_err(ab3100->dev,
295 "write error (maskset send address) "
296 "%d bytes transferred (expected 1)\n",
297 err);
298 err = -EIO;
299 goto get_maskset_unlock;
300 }
301
302 err = i2c_master_recv(ab3100->i2c_client, &regandval[1], 1);
303 if (err < 0) {
304 dev_err(ab3100->dev,
305 "write error (maskset read register): %d\n",
306 err);
307 goto get_maskset_unlock;
308 } else if (err != 1) {
309 dev_err(ab3100->dev,
310 "write error (maskset read register) "
311 "%d bytes transferred (expected 1)\n",
312 err);
313 err = -EIO;
314 goto get_maskset_unlock;
315 }
316
317 /* Modify the register */
318 regandval[1] &= andmask;
319 regandval[1] |= ormask;
320
321 /* Write the register */
322 err = i2c_master_send(ab3100->i2c_client, regandval, 2);
323 if (err < 0) {
324 dev_err(ab3100->dev,
325 "write error (write register): %d\n",
326 err);
327 goto get_maskset_unlock;
328 } else if (err != 2) {
329 dev_err(ab3100->dev,
330 "write error (write register) "
331 "%d bytes transferred (expected 2)\n",
332 err);
333 err = -EIO;
334 goto get_maskset_unlock;
335 }
336
337 /* All is well */
338 err = 0;
339
340 get_maskset_unlock:
341 mutex_unlock(&ab3100->access_mutex);
342 return err;
343}
Linus Walleij956f25a2009-08-13 11:49:23 +0200344
Mattias Wallinfa661252010-05-01 18:26:20 +0200345static int mask_and_set_register_interruptible(struct device *dev, u8 bank,
346 u8 reg, u8 bitmask, u8 bitvalues)
347{
348 struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
349
350 return ab3100_mask_and_set_register_interruptible(ab3100,
351 reg, bitmask, (bitmask & bitvalues));
352}
Linus Walleij14fa5692009-05-21 23:17:06 +0200353
354/*
355 * Register a simple callback for handling any AB3100 events.
356 */
357int ab3100_event_register(struct ab3100 *ab3100,
358 struct notifier_block *nb)
359{
360 return blocking_notifier_chain_register(&ab3100->event_subscribers,
361 nb);
362}
363EXPORT_SYMBOL(ab3100_event_register);
364
365/*
366 * Remove a previously registered callback.
367 */
368int ab3100_event_unregister(struct ab3100 *ab3100,
369 struct notifier_block *nb)
370{
371 return blocking_notifier_chain_unregister(&ab3100->event_subscribers,
372 nb);
373}
374EXPORT_SYMBOL(ab3100_event_unregister);
375
376
Mattias Wallinfa661252010-05-01 18:26:20 +0200377static int ab3100_event_registers_startup_state_get(struct device *dev,
378 u8 *event)
Linus Walleij14fa5692009-05-21 23:17:06 +0200379{
Mattias Wallinfa661252010-05-01 18:26:20 +0200380 struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
Linus Walleij14fa5692009-05-21 23:17:06 +0200381 if (!ab3100->startup_events_read)
382 return -EAGAIN; /* Try again later */
Mattias Wallinfa661252010-05-01 18:26:20 +0200383 memcpy(event, ab3100->startup_events, 3);
Linus Walleij14fa5692009-05-21 23:17:06 +0200384 return 0;
385}
Mattias Wallinfa661252010-05-01 18:26:20 +0200386
387static struct abx500_ops ab3100_ops = {
388 .get_chip_id = ab3100_get_chip_id,
389 .set_register = set_register_interruptible,
390 .get_register = get_register_interruptible,
391 .get_register_page = get_register_page_interruptible,
392 .set_register_page = NULL,
393 .mask_and_set_register = mask_and_set_register_interruptible,
394 .event_registers_startup_state_get =
395 ab3100_event_registers_startup_state_get,
396 .startup_irq_enabled = NULL,
397};
Linus Walleij14fa5692009-05-21 23:17:06 +0200398
Linus Walleij0df883d2010-01-08 10:44:16 +0100399/*
400 * This is a threaded interrupt handler so we can make some
401 * I2C calls etc.
402 */
403static irqreturn_t ab3100_irq_handler(int irq, void *data)
Linus Walleij14fa5692009-05-21 23:17:06 +0200404{
Linus Walleij0df883d2010-01-08 10:44:16 +0100405 struct ab3100 *ab3100 = data;
Linus Walleij14fa5692009-05-21 23:17:06 +0200406 u8 event_regs[3];
407 u32 fatevent;
408 int err;
409
Linus Walleij2071db42010-01-19 11:41:52 +0100410 add_interrupt_randomness(irq);
411
Linus Walleij956f25a2009-08-13 11:49:23 +0200412 err = ab3100_get_register_page_interruptible(ab3100, AB3100_EVENTA1,
Linus Walleij14fa5692009-05-21 23:17:06 +0200413 event_regs, 3);
414 if (err)
Linus Walleij0df883d2010-01-08 10:44:16 +0100415 goto err_event;
Linus Walleij14fa5692009-05-21 23:17:06 +0200416
417 fatevent = (event_regs[0] << 16) |
418 (event_regs[1] << 8) |
419 event_regs[2];
420
421 if (!ab3100->startup_events_read) {
Mattias Wallinfa661252010-05-01 18:26:20 +0200422 ab3100->startup_events[0] = event_regs[0];
423 ab3100->startup_events[1] = event_regs[1];
424 ab3100->startup_events[2] = event_regs[2];
Linus Walleij14fa5692009-05-21 23:17:06 +0200425 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
Linus Walleij0df883d2010-01-08 10:44:16 +0100439 return IRQ_HANDLED;
Linus Walleij14fa5692009-05-21 23:17:06 +0200440
Linus Walleij0df883d2010-01-08 10:44:16 +0100441 err_event:
Linus Walleij14fa5692009-05-21 23:17:06 +0200442 dev_dbg(ab3100->dev,
Linus Walleij0df883d2010-01-08 10:44:16 +0100443 "error reading event status\n");
Linus Walleij14fa5692009-05-21 23:17:06 +0200444 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++) {
Linus Walleij956f25a2009-08-13 11:49:23 +0200460 ab3100_get_register_interruptible(ab3100, reg, &value);
Linus Walleij14fa5692009-05-21 23:17:06 +0200461 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 int ab3100_get_set_reg_open_file(struct inode *inode, struct file *file)
485{
486 file->private_data = inode->i_private;
487 return 0;
488}
489
Samuel Ortizdfc3aa72009-06-23 10:48:36 +0200490static ssize_t ab3100_get_set_reg(struct file *file,
491 const char __user *user_buf,
492 size_t count, loff_t *ppos)
Linus Walleij14fa5692009-05-21 23:17:06 +0200493{
494 struct ab3100_get_set_reg_priv *priv = file->private_data;
495 struct ab3100 *ab3100 = priv->ab3100;
496 char buf[32];
Samuel Ortizdfc3aa72009-06-23 10:48:36 +0200497 ssize_t buf_size;
Linus Walleij14fa5692009-05-21 23:17:06 +0200498 int regp;
499 unsigned long user_reg;
500 int err;
501 int i = 0;
502
503 /* Get userspace string and assure termination */
504 buf_size = min(count, (sizeof(buf)-1));
505 if (copy_from_user(buf, user_buf, buf_size))
506 return -EFAULT;
507 buf[buf_size] = 0;
508
509 /*
510 * The idea is here to parse a string which is either
511 * "0xnn" for reading a register, or "0xaa 0xbb" for
512 * writing 0xbb to the register 0xaa. First move past
513 * whitespace and then begin to parse the register.
514 */
515 while ((i < buf_size) && (buf[i] == ' '))
516 i++;
517 regp = i;
518
519 /*
520 * Advance pointer to end of string then terminate
521 * the register string. This is needed to satisfy
522 * the strict_strtoul() function.
523 */
524 while ((i < buf_size) && (buf[i] != ' '))
525 i++;
526 buf[i] = '\0';
527
528 err = strict_strtoul(&buf[regp], 16, &user_reg);
529 if (err)
530 return err;
531 if (user_reg > 0xff)
532 return -EINVAL;
533
534 /* Either we read or we write a register here */
535 if (!priv->mode) {
536 /* Reading */
537 u8 reg = (u8) user_reg;
538 u8 regvalue;
539
Linus Walleij956f25a2009-08-13 11:49:23 +0200540 ab3100_get_register_interruptible(ab3100, reg, &regvalue);
Linus Walleij14fa5692009-05-21 23:17:06 +0200541
542 dev_info(ab3100->dev,
543 "debug read AB3100 reg[0x%02x]: 0x%02x\n",
544 reg, regvalue);
545 } else {
546 int valp;
547 unsigned long user_value;
548 u8 reg = (u8) user_reg;
549 u8 value;
550 u8 regvalue;
551
552 /*
553 * Writing, we need some value to write to
554 * the register so keep parsing the string
555 * from userspace.
556 */
557 i++;
558 while ((i < buf_size) && (buf[i] == ' '))
559 i++;
560 valp = i;
561 while ((i < buf_size) && (buf[i] != ' '))
562 i++;
563 buf[i] = '\0';
564
565 err = strict_strtoul(&buf[valp], 16, &user_value);
566 if (err)
567 return err;
568 if (user_reg > 0xff)
569 return -EINVAL;
570
571 value = (u8) user_value;
Linus Walleij956f25a2009-08-13 11:49:23 +0200572 ab3100_set_register_interruptible(ab3100, reg, value);
573 ab3100_get_register_interruptible(ab3100, reg, &regvalue);
Linus Walleij14fa5692009-05-21 23:17:06 +0200574
575 dev_info(ab3100->dev,
576 "debug write reg[0x%02x] with 0x%02x, "
577 "after readback: 0x%02x\n",
578 reg, value, regvalue);
579 }
580 return buf_size;
581}
582
583static const struct file_operations ab3100_get_set_reg_fops = {
584 .open = ab3100_get_set_reg_open_file,
585 .write = ab3100_get_set_reg,
586};
587
588static struct dentry *ab3100_dir;
589static struct dentry *ab3100_reg_file;
590static struct ab3100_get_set_reg_priv ab3100_get_priv;
591static struct dentry *ab3100_get_reg_file;
592static struct ab3100_get_set_reg_priv ab3100_set_priv;
593static struct dentry *ab3100_set_reg_file;
594
595static void ab3100_setup_debugfs(struct ab3100 *ab3100)
596{
597 int err;
598
599 ab3100_dir = debugfs_create_dir("ab3100", NULL);
600 if (!ab3100_dir)
601 goto exit_no_debugfs;
602
603 ab3100_reg_file = debugfs_create_file("registers",
604 S_IRUGO, ab3100_dir, ab3100,
605 &ab3100_registers_fops);
606 if (!ab3100_reg_file) {
607 err = -ENOMEM;
608 goto exit_destroy_dir;
609 }
610
611 ab3100_get_priv.ab3100 = ab3100;
612 ab3100_get_priv.mode = false;
613 ab3100_get_reg_file = debugfs_create_file("get_reg",
614 S_IWUGO, ab3100_dir, &ab3100_get_priv,
615 &ab3100_get_set_reg_fops);
616 if (!ab3100_get_reg_file) {
617 err = -ENOMEM;
618 goto exit_destroy_reg;
619 }
620
621 ab3100_set_priv.ab3100 = ab3100;
622 ab3100_set_priv.mode = true;
623 ab3100_set_reg_file = debugfs_create_file("set_reg",
624 S_IWUGO, ab3100_dir, &ab3100_set_priv,
625 &ab3100_get_set_reg_fops);
626 if (!ab3100_set_reg_file) {
627 err = -ENOMEM;
628 goto exit_destroy_get_reg;
629 }
630 return;
631
632 exit_destroy_get_reg:
633 debugfs_remove(ab3100_get_reg_file);
634 exit_destroy_reg:
635 debugfs_remove(ab3100_reg_file);
636 exit_destroy_dir:
637 debugfs_remove(ab3100_dir);
638 exit_no_debugfs:
639 return;
640}
641static inline void ab3100_remove_debugfs(void)
642{
643 debugfs_remove(ab3100_set_reg_file);
644 debugfs_remove(ab3100_get_reg_file);
645 debugfs_remove(ab3100_reg_file);
646 debugfs_remove(ab3100_dir);
647}
648#else
649static inline void ab3100_setup_debugfs(struct ab3100 *ab3100)
650{
651}
652static inline void ab3100_remove_debugfs(void)
653{
654}
655#endif
656
657/*
658 * Basic set-up, datastructure creation/destruction and I2C interface.
659 * This sets up a default config in the AB3100 chip so that it
660 * will work as expected.
661 */
662
663struct ab3100_init_setting {
664 u8 abreg;
665 u8 setting;
666};
667
Andrew Morton00d38032009-09-21 17:01:07 -0700668static const struct ab3100_init_setting __initconst
Linus Walleij14fa5692009-05-21 23:17:06 +0200669ab3100_init_settings[] = {
670 {
671 .abreg = AB3100_MCA,
672 .setting = 0x01
673 }, {
674 .abreg = AB3100_MCB,
675 .setting = 0x30
676 }, {
677 .abreg = AB3100_IMRA1,
678 .setting = 0x00
679 }, {
680 .abreg = AB3100_IMRA2,
681 .setting = 0xFF
682 }, {
683 .abreg = AB3100_IMRA3,
684 .setting = 0x01
685 }, {
686 .abreg = AB3100_IMRB1,
Linus Walleijce290b02009-08-13 11:49:49 +0200687 .setting = 0xBF
Linus Walleij14fa5692009-05-21 23:17:06 +0200688 }, {
689 .abreg = AB3100_IMRB2,
690 .setting = 0xFF
691 }, {
692 .abreg = AB3100_IMRB3,
693 .setting = 0xFF
694 }, {
695 .abreg = AB3100_SUP,
696 .setting = 0x00
697 }, {
698 .abreg = AB3100_DIS,
699 .setting = 0xF0
700 }, {
701 .abreg = AB3100_D0C,
702 .setting = 0x00
703 }, {
704 .abreg = AB3100_D1C,
705 .setting = 0x00
706 }, {
707 .abreg = AB3100_D2C,
708 .setting = 0x00
709 }, {
710 .abreg = AB3100_D3C,
711 .setting = 0x00
712 },
713};
714
715static int __init ab3100_setup(struct ab3100 *ab3100)
716{
717 int err = 0;
718 int i;
719
720 for (i = 0; i < ARRAY_SIZE(ab3100_init_settings); i++) {
Linus Walleij956f25a2009-08-13 11:49:23 +0200721 err = ab3100_set_register_interruptible(ab3100,
Linus Walleij14fa5692009-05-21 23:17:06 +0200722 ab3100_init_settings[i].abreg,
723 ab3100_init_settings[i].setting);
724 if (err)
725 goto exit_no_setup;
726 }
727
728 /*
729 * Special trick to make the AB3100 use the 32kHz clock (RTC)
Linus Walleij956f25a2009-08-13 11:49:23 +0200730 * bit 3 in test register 0x02 is a special, undocumented test
Linus Walleij14fa5692009-05-21 23:17:06 +0200731 * register bit that only exist in AB3100 P1E
732 */
733 if (ab3100->chip_id == 0xc4) {
734 dev_warn(ab3100->dev,
735 "AB3100 P1E variant detected, "
736 "forcing chip to 32KHz\n");
Mattias Wallinfa661252010-05-01 18:26:20 +0200737 err = ab3100_set_test_register_interruptible(ab3100,
738 0x02, 0x08);
Linus Walleij14fa5692009-05-21 23:17:06 +0200739 }
740
741 exit_no_setup:
742 return err;
743}
744
745/*
746 * Here we define all the platform devices that appear
747 * as children of the AB3100. These are regular platform
748 * devices with the IORESOURCE_IO .start and .end set
749 * to correspond to the internal AB3100 register range
750 * mapping to the corresponding subdevice.
751 */
752
753#define AB3100_DEVICE(devname, devid) \
754static struct platform_device ab3100_##devname##_device = { \
755 .name = devid, \
756 .id = -1, \
757}
758
Linus Walleij2071db42010-01-19 11:41:52 +0100759/* This lists all the subdevices */
Linus Walleij14fa5692009-05-21 23:17:06 +0200760AB3100_DEVICE(dac, "ab3100-dac");
761AB3100_DEVICE(leds, "ab3100-leds");
762AB3100_DEVICE(power, "ab3100-power");
763AB3100_DEVICE(regulators, "ab3100-regulators");
764AB3100_DEVICE(sim, "ab3100-sim");
765AB3100_DEVICE(uart, "ab3100-uart");
766AB3100_DEVICE(rtc, "ab3100-rtc");
767AB3100_DEVICE(charger, "ab3100-charger");
768AB3100_DEVICE(boost, "ab3100-boost");
769AB3100_DEVICE(adc, "ab3100-adc");
770AB3100_DEVICE(fuelgauge, "ab3100-fuelgauge");
771AB3100_DEVICE(vibrator, "ab3100-vibrator");
772AB3100_DEVICE(otp, "ab3100-otp");
773AB3100_DEVICE(codec, "ab3100-codec");
774
775static struct platform_device *
776ab3100_platform_devs[] = {
777 &ab3100_dac_device,
778 &ab3100_leds_device,
779 &ab3100_power_device,
780 &ab3100_regulators_device,
781 &ab3100_sim_device,
782 &ab3100_uart_device,
783 &ab3100_rtc_device,
784 &ab3100_charger_device,
785 &ab3100_boost_device,
786 &ab3100_adc_device,
787 &ab3100_fuelgauge_device,
788 &ab3100_vibrator_device,
789 &ab3100_otp_device,
790 &ab3100_codec_device,
791};
792
793struct ab_family_id {
794 u8 id;
795 char *name;
796};
797
798static const struct ab_family_id ids[] __initdata = {
799 /* AB3100 */
800 {
801 .id = 0xc0,
802 .name = "P1A"
803 }, {
804 .id = 0xc1,
805 .name = "P1B"
806 }, {
807 .id = 0xc2,
808 .name = "P1C"
809 }, {
810 .id = 0xc3,
811 .name = "P1D"
812 }, {
813 .id = 0xc4,
814 .name = "P1E"
815 }, {
816 .id = 0xc5,
817 .name = "P1F/R1A"
818 }, {
819 .id = 0xc6,
820 .name = "P1G/R1A"
821 }, {
822 .id = 0xc7,
823 .name = "P2A/R2A"
824 }, {
825 .id = 0xc8,
826 .name = "P2B/R2B"
827 },
828 /* AB3000 variants, not supported */
829 {
830 .id = 0xa0
831 }, {
832 .id = 0xa1
833 }, {
834 .id = 0xa2
835 }, {
836 .id = 0xa3
837 }, {
838 .id = 0xa4
839 }, {
840 .id = 0xa5
841 }, {
842 .id = 0xa6
843 }, {
844 .id = 0xa7
845 },
846 /* Terminator */
847 {
848 .id = 0x00,
849 },
850};
851
852static int __init ab3100_probe(struct i2c_client *client,
853 const struct i2c_device_id *id)
854{
855 struct ab3100 *ab3100;
Linus Walleijd619bc12009-09-09 11:31:00 +0200856 struct ab3100_platform_data *ab3100_plf_data =
857 client->dev.platform_data;
Linus Walleij14fa5692009-05-21 23:17:06 +0200858 int err;
859 int i;
860
861 ab3100 = kzalloc(sizeof(struct ab3100), GFP_KERNEL);
862 if (!ab3100) {
863 dev_err(&client->dev, "could not allocate AB3100 device\n");
864 return -ENOMEM;
865 }
866
867 /* Initialize data structure */
868 mutex_init(&ab3100->access_mutex);
869 BLOCKING_INIT_NOTIFIER_HEAD(&ab3100->event_subscribers);
870
871 ab3100->i2c_client = client;
872 ab3100->dev = &ab3100->i2c_client->dev;
873
874 i2c_set_clientdata(client, ab3100);
875
876 /* Read chip ID register */
Linus Walleij956f25a2009-08-13 11:49:23 +0200877 err = ab3100_get_register_interruptible(ab3100, AB3100_CID,
878 &ab3100->chip_id);
Linus Walleij14fa5692009-05-21 23:17:06 +0200879 if (err) {
880 dev_err(&client->dev,
881 "could not communicate with the AB3100 analog "
882 "baseband chip\n");
883 goto exit_no_detect;
884 }
885
886 for (i = 0; ids[i].id != 0x0; i++) {
887 if (ids[i].id == ab3100->chip_id) {
888 if (ids[i].name != NULL) {
889 snprintf(&ab3100->chip_name[0],
890 sizeof(ab3100->chip_name) - 1,
891 "AB3100 %s",
892 ids[i].name);
893 break;
894 } else {
895 dev_err(&client->dev,
896 "AB3000 is not supported\n");
897 goto exit_no_detect;
898 }
899 }
900 }
901
902 if (ids[i].id == 0x0) {
903 dev_err(&client->dev, "unknown analog baseband chip id: 0x%x\n",
904 ab3100->chip_id);
905 dev_err(&client->dev, "accepting it anyway. Please update "
906 "the driver.\n");
907 goto exit_no_detect;
908 }
909
910 dev_info(&client->dev, "Detected chip: %s\n",
911 &ab3100->chip_name[0]);
912
913 /* Attach a second dummy i2c_client to the test register address */
914 ab3100->testreg_client = i2c_new_dummy(client->adapter,
915 client->addr + 1);
916 if (!ab3100->testreg_client) {
917 err = -ENOMEM;
918 goto exit_no_testreg_client;
919 }
920
Linus Walleij14fa5692009-05-21 23:17:06 +0200921 err = ab3100_setup(ab3100);
922 if (err)
923 goto exit_no_setup;
924
Linus Walleij0df883d2010-01-08 10:44:16 +0100925 err = request_threaded_irq(client->irq, NULL, ab3100_irq_handler,
Linus Walleij2071db42010-01-19 11:41:52 +0100926 IRQF_ONESHOT, "ab3100-core", ab3100);
927 /* This real unpredictable IRQ is of course sampled for entropy */
928 rand_initialize_irq(client->irq);
929
Linus Walleij14fa5692009-05-21 23:17:06 +0200930 if (err)
931 goto exit_no_irq;
932
Mattias Wallinfa661252010-05-01 18:26:20 +0200933 err = abx500_register_ops(&client->dev, &ab3100_ops);
934 if (err)
935 goto exit_no_ops;
936
Linus Walleij14fa5692009-05-21 23:17:06 +0200937 /* Set parent and a pointer back to the container in device data */
938 for (i = 0; i < ARRAY_SIZE(ab3100_platform_devs); i++) {
939 ab3100_platform_devs[i]->dev.parent =
940 &client->dev;
Linus Walleijd619bc12009-09-09 11:31:00 +0200941 ab3100_platform_devs[i]->dev.platform_data =
942 ab3100_plf_data;
Linus Walleij14fa5692009-05-21 23:17:06 +0200943 platform_set_drvdata(ab3100_platform_devs[i], ab3100);
944 }
945
946 /* Register the platform devices */
947 platform_add_devices(ab3100_platform_devs,
948 ARRAY_SIZE(ab3100_platform_devs));
949
950 ab3100_setup_debugfs(ab3100);
951
952 return 0;
953
Mattias Wallinfa661252010-05-01 18:26:20 +0200954 exit_no_ops:
Linus Walleij14fa5692009-05-21 23:17:06 +0200955 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 __exit ab3100_remove(struct i2c_client *client)
965{
966 struct ab3100 *ab3100 = i2c_get_clientdata(client);
967 int i;
968
969 /* Unregister subdevices */
970 for (i = 0; i < ARRAY_SIZE(ab3100_platform_devs); i++)
971 platform_device_unregister(ab3100_platform_devs[i]);
972
973 ab3100_remove_debugfs();
974 i2c_unregister_device(ab3100->testreg_client);
975
976 /*
977 * At this point, all subscribers should have unregistered
978 * their notifiers so deactivate IRQ
979 */
980 free_irq(client->irq, ab3100);
981 kfree(ab3100);
982 return 0;
983}
984
985static const struct i2c_device_id ab3100_id[] = {
Jean Delvaredcffa122009-10-04 22:53:44 +0200986 { "ab3100", 0 },
Linus Walleij14fa5692009-05-21 23:17:06 +0200987 { }
988};
989MODULE_DEVICE_TABLE(i2c, ab3100_id);
990
991static struct i2c_driver ab3100_driver = {
992 .driver = {
993 .name = "ab3100",
994 .owner = THIS_MODULE,
995 },
996 .id_table = ab3100_id,
997 .probe = ab3100_probe,
998 .remove = __exit_p(ab3100_remove),
999};
1000
1001static int __init ab3100_i2c_init(void)
1002{
1003 return i2c_add_driver(&ab3100_driver);
1004}
1005
1006static void __exit ab3100_i2c_exit(void)
1007{
1008 i2c_del_driver(&ab3100_driver);
1009}
1010
1011subsys_initcall(ab3100_i2c_init);
1012module_exit(ab3100_i2c_exit);
1013
1014MODULE_AUTHOR("Linus Walleij <linus.walleij@stericsson.com>");
1015MODULE_DESCRIPTION("AB3100 core driver");
1016MODULE_LICENSE("GPL");