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14fa5691 LW |
1 | /* |
2 | * Copyright (C) 2007-2009 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/err.h> | |
14 | #include <linux/platform_device.h> | |
15 | #include <linux/device.h> | |
16 | #include <linux/interrupt.h> | |
14fa5691 LW |
17 | #include <linux/debugfs.h> |
18 | #include <linux/seq_file.h> | |
19 | #include <linux/uaccess.h> | |
20 | #include <linux/mfd/ab3100.h> | |
21 | ||
22 | /* These are the only registers inside AB3100 used in this main file */ | |
23 | ||
24 | /* Interrupt event registers */ | |
25 | #define AB3100_EVENTA1 0x21 | |
26 | #define AB3100_EVENTA2 0x22 | |
27 | #define AB3100_EVENTA3 0x23 | |
28 | ||
29 | /* AB3100 DAC converter registers */ | |
30 | #define AB3100_DIS 0x00 | |
31 | #define AB3100_D0C 0x01 | |
32 | #define AB3100_D1C 0x02 | |
33 | #define AB3100_D2C 0x03 | |
34 | #define AB3100_D3C 0x04 | |
35 | ||
36 | /* Chip ID register */ | |
37 | #define AB3100_CID 0x20 | |
38 | ||
39 | /* AB3100 interrupt registers */ | |
40 | #define AB3100_IMRA1 0x24 | |
41 | #define AB3100_IMRA2 0x25 | |
42 | #define AB3100_IMRA3 0x26 | |
43 | #define AB3100_IMRB1 0x2B | |
44 | #define AB3100_IMRB2 0x2C | |
45 | #define AB3100_IMRB3 0x2D | |
46 | ||
47 | /* System Power Monitoring and control registers */ | |
48 | #define AB3100_MCA 0x2E | |
49 | #define AB3100_MCB 0x2F | |
50 | ||
51 | /* SIM power up */ | |
52 | #define AB3100_SUP 0x50 | |
53 | ||
54 | /* | |
55 | * I2C communication | |
56 | * | |
57 | * The AB3100 is usually assigned address 0x48 (7-bit) | |
58 | * The chip is defined in the platform i2c_board_data section. | |
59 | */ | |
14fa5691 LW |
60 | |
61 | u8 ab3100_get_chip_type(struct ab3100 *ab3100) | |
62 | { | |
63 | u8 chip = ABUNKNOWN; | |
64 | ||
65 | switch (ab3100->chip_id & 0xf0) { | |
66 | case 0xa0: | |
67 | chip = AB3000; | |
68 | break; | |
69 | case 0xc0: | |
70 | chip = AB3100; | |
71 | break; | |
72 | } | |
73 | return chip; | |
74 | } | |
75 | EXPORT_SYMBOL(ab3100_get_chip_type); | |
76 | ||
956f25a6 | 77 | int ab3100_set_register_interruptible(struct ab3100 *ab3100, u8 reg, u8 regval) |
14fa5691 LW |
78 | { |
79 | u8 regandval[2] = {reg, regval}; | |
80 | int err; | |
81 | ||
82 | err = mutex_lock_interruptible(&ab3100->access_mutex); | |
83 | if (err) | |
84 | return err; | |
85 | ||
86 | /* | |
87 | * A two-byte write message with the first byte containing the register | |
88 | * number and the second byte containing the value to be written | |
89 | * effectively sets a register in the AB3100. | |
90 | */ | |
91 | err = i2c_master_send(ab3100->i2c_client, regandval, 2); | |
92 | if (err < 0) { | |
93 | dev_err(ab3100->dev, | |
94 | "write error (write register): %d\n", | |
95 | err); | |
96 | } else if (err != 2) { | |
97 | dev_err(ab3100->dev, | |
98 | "write error (write register) " | |
99 | "%d bytes transferred (expected 2)\n", | |
100 | err); | |
101 | err = -EIO; | |
102 | } else { | |
103 | /* All is well */ | |
104 | err = 0; | |
105 | } | |
106 | mutex_unlock(&ab3100->access_mutex); | |
7cdc2b98 | 107 | return err; |
14fa5691 | 108 | } |
956f25a6 LW |
109 | EXPORT_SYMBOL(ab3100_set_register_interruptible); |
110 | ||
14fa5691 LW |
111 | |
112 | /* | |
113 | * The test registers exist at an I2C bus address up one | |
114 | * from the ordinary base. They are not supposed to be used | |
115 | * in production code, but sometimes you have to do that | |
116 | * anyway. It's currently only used from this file so declare | |
117 | * it static and do not export. | |
118 | */ | |
956f25a6 | 119 | static int ab3100_set_test_register_interruptible(struct ab3100 *ab3100, |
14fa5691 LW |
120 | u8 reg, u8 regval) |
121 | { | |
122 | u8 regandval[2] = {reg, regval}; | |
123 | int err; | |
124 | ||
125 | err = mutex_lock_interruptible(&ab3100->access_mutex); | |
126 | if (err) | |
127 | return err; | |
128 | ||
129 | err = i2c_master_send(ab3100->testreg_client, regandval, 2); | |
130 | if (err < 0) { | |
131 | dev_err(ab3100->dev, | |
132 | "write error (write test register): %d\n", | |
133 | err); | |
134 | } else if (err != 2) { | |
135 | dev_err(ab3100->dev, | |
136 | "write error (write test register) " | |
137 | "%d bytes transferred (expected 2)\n", | |
138 | err); | |
139 | err = -EIO; | |
140 | } else { | |
141 | /* All is well */ | |
142 | err = 0; | |
143 | } | |
144 | mutex_unlock(&ab3100->access_mutex); | |
145 | ||
146 | return err; | |
147 | } | |
148 | ||
956f25a6 LW |
149 | |
150 | int ab3100_get_register_interruptible(struct ab3100 *ab3100, u8 reg, u8 *regval) | |
14fa5691 LW |
151 | { |
152 | int err; | |
153 | ||
154 | err = mutex_lock_interruptible(&ab3100->access_mutex); | |
155 | if (err) | |
156 | return err; | |
157 | ||
158 | /* | |
159 | * AB3100 require an I2C "stop" command between each message, else | |
160 | * it will not work. The only way of achieveing this with the | |
161 | * message transport layer is to send the read and write messages | |
162 | * separately. | |
163 | */ | |
164 | err = i2c_master_send(ab3100->i2c_client, ®, 1); | |
165 | if (err < 0) { | |
166 | dev_err(ab3100->dev, | |
167 | "write error (send register address): %d\n", | |
168 | err); | |
169 | goto get_reg_out_unlock; | |
170 | } else if (err != 1) { | |
171 | dev_err(ab3100->dev, | |
172 | "write error (send register address) " | |
173 | "%d bytes transferred (expected 1)\n", | |
174 | err); | |
175 | err = -EIO; | |
176 | goto get_reg_out_unlock; | |
177 | } else { | |
178 | /* All is well */ | |
179 | err = 0; | |
180 | } | |
181 | ||
182 | err = i2c_master_recv(ab3100->i2c_client, regval, 1); | |
183 | if (err < 0) { | |
184 | dev_err(ab3100->dev, | |
185 | "write error (read register): %d\n", | |
186 | err); | |
187 | goto get_reg_out_unlock; | |
188 | } else if (err != 1) { | |
189 | dev_err(ab3100->dev, | |
190 | "write error (read register) " | |
191 | "%d bytes transferred (expected 1)\n", | |
192 | err); | |
193 | err = -EIO; | |
194 | goto get_reg_out_unlock; | |
195 | } else { | |
196 | /* All is well */ | |
197 | err = 0; | |
198 | } | |
199 | ||
200 | get_reg_out_unlock: | |
201 | mutex_unlock(&ab3100->access_mutex); | |
202 | return err; | |
203 | } | |
956f25a6 LW |
204 | EXPORT_SYMBOL(ab3100_get_register_interruptible); |
205 | ||
14fa5691 | 206 | |
956f25a6 | 207 | int ab3100_get_register_page_interruptible(struct ab3100 *ab3100, |
14fa5691 LW |
208 | u8 first_reg, u8 *regvals, u8 numregs) |
209 | { | |
210 | int err; | |
211 | ||
212 | if (ab3100->chip_id == 0xa0 || | |
213 | ab3100->chip_id == 0xa1) | |
214 | /* These don't support paged reads */ | |
215 | return -EIO; | |
216 | ||
217 | err = mutex_lock_interruptible(&ab3100->access_mutex); | |
218 | if (err) | |
219 | return err; | |
220 | ||
221 | /* | |
222 | * Paged read also require an I2C "stop" command. | |
223 | */ | |
224 | err = i2c_master_send(ab3100->i2c_client, &first_reg, 1); | |
225 | if (err < 0) { | |
226 | dev_err(ab3100->dev, | |
227 | "write error (send first register address): %d\n", | |
228 | err); | |
229 | goto get_reg_page_out_unlock; | |
230 | } else if (err != 1) { | |
231 | dev_err(ab3100->dev, | |
232 | "write error (send first register address) " | |
233 | "%d bytes transferred (expected 1)\n", | |
234 | err); | |
235 | err = -EIO; | |
236 | goto get_reg_page_out_unlock; | |
237 | } | |
238 | ||
239 | err = i2c_master_recv(ab3100->i2c_client, regvals, numregs); | |
240 | if (err < 0) { | |
241 | dev_err(ab3100->dev, | |
242 | "write error (read register page): %d\n", | |
243 | err); | |
244 | goto get_reg_page_out_unlock; | |
245 | } else if (err != numregs) { | |
246 | dev_err(ab3100->dev, | |
247 | "write error (read register page) " | |
248 | "%d bytes transferred (expected %d)\n", | |
249 | err, numregs); | |
250 | err = -EIO; | |
251 | goto get_reg_page_out_unlock; | |
252 | } | |
253 | ||
254 | /* All is well */ | |
255 | err = 0; | |
256 | ||
257 | get_reg_page_out_unlock: | |
258 | mutex_unlock(&ab3100->access_mutex); | |
259 | return err; | |
260 | } | |
956f25a6 | 261 | EXPORT_SYMBOL(ab3100_get_register_page_interruptible); |
14fa5691 | 262 | |
956f25a6 LW |
263 | |
264 | int ab3100_mask_and_set_register_interruptible(struct ab3100 *ab3100, | |
14fa5691 LW |
265 | u8 reg, u8 andmask, u8 ormask) |
266 | { | |
267 | u8 regandval[2] = {reg, 0}; | |
268 | int err; | |
269 | ||
270 | err = mutex_lock_interruptible(&ab3100->access_mutex); | |
271 | if (err) | |
272 | return err; | |
273 | ||
274 | /* First read out the target register */ | |
275 | err = i2c_master_send(ab3100->i2c_client, ®, 1); | |
276 | if (err < 0) { | |
277 | dev_err(ab3100->dev, | |
278 | "write error (maskset send address): %d\n", | |
279 | err); | |
280 | goto get_maskset_unlock; | |
281 | } else if (err != 1) { | |
282 | dev_err(ab3100->dev, | |
283 | "write error (maskset send address) " | |
284 | "%d bytes transferred (expected 1)\n", | |
285 | err); | |
286 | err = -EIO; | |
287 | goto get_maskset_unlock; | |
288 | } | |
289 | ||
290 | err = i2c_master_recv(ab3100->i2c_client, ®andval[1], 1); | |
291 | if (err < 0) { | |
292 | dev_err(ab3100->dev, | |
293 | "write error (maskset read register): %d\n", | |
294 | err); | |
295 | goto get_maskset_unlock; | |
296 | } else if (err != 1) { | |
297 | dev_err(ab3100->dev, | |
298 | "write error (maskset read register) " | |
299 | "%d bytes transferred (expected 1)\n", | |
300 | err); | |
301 | err = -EIO; | |
302 | goto get_maskset_unlock; | |
303 | } | |
304 | ||
305 | /* Modify the register */ | |
306 | regandval[1] &= andmask; | |
307 | regandval[1] |= ormask; | |
308 | ||
309 | /* Write the register */ | |
310 | err = i2c_master_send(ab3100->i2c_client, regandval, 2); | |
311 | if (err < 0) { | |
312 | dev_err(ab3100->dev, | |
313 | "write error (write register): %d\n", | |
314 | err); | |
315 | goto get_maskset_unlock; | |
316 | } else if (err != 2) { | |
317 | dev_err(ab3100->dev, | |
318 | "write error (write register) " | |
319 | "%d bytes transferred (expected 2)\n", | |
320 | err); | |
321 | err = -EIO; | |
322 | goto get_maskset_unlock; | |
323 | } | |
324 | ||
325 | /* All is well */ | |
326 | err = 0; | |
327 | ||
328 | get_maskset_unlock: | |
329 | mutex_unlock(&ab3100->access_mutex); | |
330 | return err; | |
331 | } | |
956f25a6 LW |
332 | EXPORT_SYMBOL(ab3100_mask_and_set_register_interruptible); |
333 | ||
14fa5691 LW |
334 | |
335 | /* | |
336 | * Register a simple callback for handling any AB3100 events. | |
337 | */ | |
338 | int ab3100_event_register(struct ab3100 *ab3100, | |
339 | struct notifier_block *nb) | |
340 | { | |
341 | return blocking_notifier_chain_register(&ab3100->event_subscribers, | |
342 | nb); | |
343 | } | |
344 | EXPORT_SYMBOL(ab3100_event_register); | |
345 | ||
346 | /* | |
347 | * Remove a previously registered callback. | |
348 | */ | |
349 | int ab3100_event_unregister(struct ab3100 *ab3100, | |
350 | struct notifier_block *nb) | |
351 | { | |
352 | return blocking_notifier_chain_unregister(&ab3100->event_subscribers, | |
353 | nb); | |
354 | } | |
355 | EXPORT_SYMBOL(ab3100_event_unregister); | |
356 | ||
357 | ||
358 | int ab3100_event_registers_startup_state_get(struct ab3100 *ab3100, | |
359 | u32 *fatevent) | |
360 | { | |
361 | if (!ab3100->startup_events_read) | |
362 | return -EAGAIN; /* Try again later */ | |
363 | *fatevent = ab3100->startup_events; | |
364 | return 0; | |
365 | } | |
366 | EXPORT_SYMBOL(ab3100_event_registers_startup_state_get); | |
367 | ||
368 | /* Interrupt handling worker */ | |
369 | static void ab3100_work(struct work_struct *work) | |
370 | { | |
371 | struct ab3100 *ab3100 = container_of(work, struct ab3100, work); | |
372 | u8 event_regs[3]; | |
373 | u32 fatevent; | |
374 | int err; | |
375 | ||
956f25a6 | 376 | err = ab3100_get_register_page_interruptible(ab3100, AB3100_EVENTA1, |
14fa5691 LW |
377 | event_regs, 3); |
378 | if (err) | |
379 | goto err_event_wq; | |
380 | ||
381 | fatevent = (event_regs[0] << 16) | | |
382 | (event_regs[1] << 8) | | |
383 | event_regs[2]; | |
384 | ||
385 | if (!ab3100->startup_events_read) { | |
386 | ab3100->startup_events = fatevent; | |
387 | ab3100->startup_events_read = true; | |
388 | } | |
389 | /* | |
390 | * The notified parties will have to mask out the events | |
391 | * they're interested in and react to them. They will be | |
392 | * notified on all events, then they use the fatevent value | |
393 | * to determine if they're interested. | |
394 | */ | |
395 | blocking_notifier_call_chain(&ab3100->event_subscribers, | |
396 | fatevent, NULL); | |
397 | ||
398 | dev_dbg(ab3100->dev, | |
399 | "IRQ Event: 0x%08x\n", fatevent); | |
400 | ||
401 | /* By now the IRQ should be acked and deasserted so enable it again */ | |
402 | enable_irq(ab3100->i2c_client->irq); | |
403 | return; | |
404 | ||
405 | err_event_wq: | |
406 | dev_dbg(ab3100->dev, | |
407 | "error in event workqueue\n"); | |
408 | /* Enable the IRQ anyway, what choice do we have? */ | |
409 | enable_irq(ab3100->i2c_client->irq); | |
410 | return; | |
411 | } | |
412 | ||
413 | static irqreturn_t ab3100_irq_handler(int irq, void *data) | |
414 | { | |
415 | struct ab3100 *ab3100 = data; | |
416 | /* | |
417 | * Disable the IRQ and dispatch a worker to handle the | |
418 | * event. Since the chip resides on I2C this is slow | |
419 | * stuff and we will re-enable the interrupts once th | |
420 | * worker has finished. | |
421 | */ | |
0ad651c9 | 422 | disable_irq_nosync(irq); |
14fa5691 LW |
423 | schedule_work(&ab3100->work); |
424 | return IRQ_HANDLED; | |
425 | } | |
426 | ||
427 | #ifdef CONFIG_DEBUG_FS | |
428 | /* | |
429 | * Some debugfs entries only exposed if we're using debug | |
430 | */ | |
431 | static int ab3100_registers_print(struct seq_file *s, void *p) | |
432 | { | |
433 | struct ab3100 *ab3100 = s->private; | |
434 | u8 value; | |
435 | u8 reg; | |
436 | ||
437 | seq_printf(s, "AB3100 registers:\n"); | |
438 | ||
439 | for (reg = 0; reg < 0xff; reg++) { | |
956f25a6 | 440 | ab3100_get_register_interruptible(ab3100, reg, &value); |
14fa5691 LW |
441 | seq_printf(s, "[0x%x]: 0x%x\n", reg, value); |
442 | } | |
443 | return 0; | |
444 | } | |
445 | ||
446 | static int ab3100_registers_open(struct inode *inode, struct file *file) | |
447 | { | |
448 | return single_open(file, ab3100_registers_print, inode->i_private); | |
449 | } | |
450 | ||
451 | static const struct file_operations ab3100_registers_fops = { | |
452 | .open = ab3100_registers_open, | |
453 | .read = seq_read, | |
454 | .llseek = seq_lseek, | |
455 | .release = single_release, | |
456 | .owner = THIS_MODULE, | |
457 | }; | |
458 | ||
459 | struct ab3100_get_set_reg_priv { | |
460 | struct ab3100 *ab3100; | |
461 | bool mode; | |
462 | }; | |
463 | ||
464 | static int ab3100_get_set_reg_open_file(struct inode *inode, struct file *file) | |
465 | { | |
466 | file->private_data = inode->i_private; | |
467 | return 0; | |
468 | } | |
469 | ||
dfc3aa72 SO |
470 | static ssize_t ab3100_get_set_reg(struct file *file, |
471 | const char __user *user_buf, | |
472 | size_t count, loff_t *ppos) | |
14fa5691 LW |
473 | { |
474 | struct ab3100_get_set_reg_priv *priv = file->private_data; | |
475 | struct ab3100 *ab3100 = priv->ab3100; | |
476 | char buf[32]; | |
dfc3aa72 | 477 | ssize_t buf_size; |
14fa5691 LW |
478 | int regp; |
479 | unsigned long user_reg; | |
480 | int err; | |
481 | int i = 0; | |
482 | ||
483 | /* Get userspace string and assure termination */ | |
484 | buf_size = min(count, (sizeof(buf)-1)); | |
485 | if (copy_from_user(buf, user_buf, buf_size)) | |
486 | return -EFAULT; | |
487 | buf[buf_size] = 0; | |
488 | ||
489 | /* | |
490 | * The idea is here to parse a string which is either | |
491 | * "0xnn" for reading a register, or "0xaa 0xbb" for | |
492 | * writing 0xbb to the register 0xaa. First move past | |
493 | * whitespace and then begin to parse the register. | |
494 | */ | |
495 | while ((i < buf_size) && (buf[i] == ' ')) | |
496 | i++; | |
497 | regp = i; | |
498 | ||
499 | /* | |
500 | * Advance pointer to end of string then terminate | |
501 | * the register string. This is needed to satisfy | |
502 | * the strict_strtoul() function. | |
503 | */ | |
504 | while ((i < buf_size) && (buf[i] != ' ')) | |
505 | i++; | |
506 | buf[i] = '\0'; | |
507 | ||
508 | err = strict_strtoul(&buf[regp], 16, &user_reg); | |
509 | if (err) | |
510 | return err; | |
511 | if (user_reg > 0xff) | |
512 | return -EINVAL; | |
513 | ||
514 | /* Either we read or we write a register here */ | |
515 | if (!priv->mode) { | |
516 | /* Reading */ | |
517 | u8 reg = (u8) user_reg; | |
518 | u8 regvalue; | |
519 | ||
956f25a6 | 520 | ab3100_get_register_interruptible(ab3100, reg, ®value); |
14fa5691 LW |
521 | |
522 | dev_info(ab3100->dev, | |
523 | "debug read AB3100 reg[0x%02x]: 0x%02x\n", | |
524 | reg, regvalue); | |
525 | } else { | |
526 | int valp; | |
527 | unsigned long user_value; | |
528 | u8 reg = (u8) user_reg; | |
529 | u8 value; | |
530 | u8 regvalue; | |
531 | ||
532 | /* | |
533 | * Writing, we need some value to write to | |
534 | * the register so keep parsing the string | |
535 | * from userspace. | |
536 | */ | |
537 | i++; | |
538 | while ((i < buf_size) && (buf[i] == ' ')) | |
539 | i++; | |
540 | valp = i; | |
541 | while ((i < buf_size) && (buf[i] != ' ')) | |
542 | i++; | |
543 | buf[i] = '\0'; | |
544 | ||
545 | err = strict_strtoul(&buf[valp], 16, &user_value); | |
546 | if (err) | |
547 | return err; | |
548 | if (user_reg > 0xff) | |
549 | return -EINVAL; | |
550 | ||
551 | value = (u8) user_value; | |
956f25a6 LW |
552 | ab3100_set_register_interruptible(ab3100, reg, value); |
553 | ab3100_get_register_interruptible(ab3100, reg, ®value); | |
14fa5691 LW |
554 | |
555 | dev_info(ab3100->dev, | |
556 | "debug write reg[0x%02x] with 0x%02x, " | |
557 | "after readback: 0x%02x\n", | |
558 | reg, value, regvalue); | |
559 | } | |
560 | return buf_size; | |
561 | } | |
562 | ||
563 | static const struct file_operations ab3100_get_set_reg_fops = { | |
564 | .open = ab3100_get_set_reg_open_file, | |
565 | .write = ab3100_get_set_reg, | |
566 | }; | |
567 | ||
568 | static struct dentry *ab3100_dir; | |
569 | static struct dentry *ab3100_reg_file; | |
570 | static struct ab3100_get_set_reg_priv ab3100_get_priv; | |
571 | static struct dentry *ab3100_get_reg_file; | |
572 | static struct ab3100_get_set_reg_priv ab3100_set_priv; | |
573 | static struct dentry *ab3100_set_reg_file; | |
574 | ||
575 | static void ab3100_setup_debugfs(struct ab3100 *ab3100) | |
576 | { | |
577 | int err; | |
578 | ||
579 | ab3100_dir = debugfs_create_dir("ab3100", NULL); | |
580 | if (!ab3100_dir) | |
581 | goto exit_no_debugfs; | |
582 | ||
583 | ab3100_reg_file = debugfs_create_file("registers", | |
584 | S_IRUGO, ab3100_dir, ab3100, | |
585 | &ab3100_registers_fops); | |
586 | if (!ab3100_reg_file) { | |
587 | err = -ENOMEM; | |
588 | goto exit_destroy_dir; | |
589 | } | |
590 | ||
591 | ab3100_get_priv.ab3100 = ab3100; | |
592 | ab3100_get_priv.mode = false; | |
593 | ab3100_get_reg_file = debugfs_create_file("get_reg", | |
594 | S_IWUGO, ab3100_dir, &ab3100_get_priv, | |
595 | &ab3100_get_set_reg_fops); | |
596 | if (!ab3100_get_reg_file) { | |
597 | err = -ENOMEM; | |
598 | goto exit_destroy_reg; | |
599 | } | |
600 | ||
601 | ab3100_set_priv.ab3100 = ab3100; | |
602 | ab3100_set_priv.mode = true; | |
603 | ab3100_set_reg_file = debugfs_create_file("set_reg", | |
604 | S_IWUGO, ab3100_dir, &ab3100_set_priv, | |
605 | &ab3100_get_set_reg_fops); | |
606 | if (!ab3100_set_reg_file) { | |
607 | err = -ENOMEM; | |
608 | goto exit_destroy_get_reg; | |
609 | } | |
610 | return; | |
611 | ||
612 | exit_destroy_get_reg: | |
613 | debugfs_remove(ab3100_get_reg_file); | |
614 | exit_destroy_reg: | |
615 | debugfs_remove(ab3100_reg_file); | |
616 | exit_destroy_dir: | |
617 | debugfs_remove(ab3100_dir); | |
618 | exit_no_debugfs: | |
619 | return; | |
620 | } | |
621 | static inline void ab3100_remove_debugfs(void) | |
622 | { | |
623 | debugfs_remove(ab3100_set_reg_file); | |
624 | debugfs_remove(ab3100_get_reg_file); | |
625 | debugfs_remove(ab3100_reg_file); | |
626 | debugfs_remove(ab3100_dir); | |
627 | } | |
628 | #else | |
629 | static inline void ab3100_setup_debugfs(struct ab3100 *ab3100) | |
630 | { | |
631 | } | |
632 | static inline void ab3100_remove_debugfs(void) | |
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 | ||
00d3803b | 648 | static const struct ab3100_init_setting __initconst |
14fa5691 LW |
649 | ab3100_init_settings[] = { |
650 | { | |
651 | .abreg = AB3100_MCA, | |
652 | .setting = 0x01 | |
653 | }, { | |
654 | .abreg = AB3100_MCB, | |
655 | .setting = 0x30 | |
656 | }, { | |
657 | .abreg = AB3100_IMRA1, | |
658 | .setting = 0x00 | |
659 | }, { | |
660 | .abreg = AB3100_IMRA2, | |
661 | .setting = 0xFF | |
662 | }, { | |
663 | .abreg = AB3100_IMRA3, | |
664 | .setting = 0x01 | |
665 | }, { | |
666 | .abreg = AB3100_IMRB1, | |
ce290b0e | 667 | .setting = 0xBF |
14fa5691 LW |
668 | }, { |
669 | .abreg = AB3100_IMRB2, | |
670 | .setting = 0xFF | |
671 | }, { | |
672 | .abreg = AB3100_IMRB3, | |
673 | .setting = 0xFF | |
674 | }, { | |
675 | .abreg = AB3100_SUP, | |
676 | .setting = 0x00 | |
677 | }, { | |
678 | .abreg = AB3100_DIS, | |
679 | .setting = 0xF0 | |
680 | }, { | |
681 | .abreg = AB3100_D0C, | |
682 | .setting = 0x00 | |
683 | }, { | |
684 | .abreg = AB3100_D1C, | |
685 | .setting = 0x00 | |
686 | }, { | |
687 | .abreg = AB3100_D2C, | |
688 | .setting = 0x00 | |
689 | }, { | |
690 | .abreg = AB3100_D3C, | |
691 | .setting = 0x00 | |
692 | }, | |
693 | }; | |
694 | ||
695 | static int __init ab3100_setup(struct ab3100 *ab3100) | |
696 | { | |
697 | int err = 0; | |
698 | int i; | |
699 | ||
700 | for (i = 0; i < ARRAY_SIZE(ab3100_init_settings); i++) { | |
956f25a6 | 701 | err = ab3100_set_register_interruptible(ab3100, |
14fa5691 LW |
702 | ab3100_init_settings[i].abreg, |
703 | ab3100_init_settings[i].setting); | |
704 | if (err) | |
705 | goto exit_no_setup; | |
706 | } | |
707 | ||
708 | /* | |
709 | * Special trick to make the AB3100 use the 32kHz clock (RTC) | |
956f25a6 | 710 | * bit 3 in test register 0x02 is a special, undocumented test |
14fa5691 LW |
711 | * register bit that only exist in AB3100 P1E |
712 | */ | |
713 | if (ab3100->chip_id == 0xc4) { | |
714 | dev_warn(ab3100->dev, | |
715 | "AB3100 P1E variant detected, " | |
716 | "forcing chip to 32KHz\n"); | |
956f25a6 | 717 | err = ab3100_set_test_register_interruptible(ab3100, 0x02, 0x08); |
14fa5691 LW |
718 | } |
719 | ||
720 | exit_no_setup: | |
721 | return err; | |
722 | } | |
723 | ||
724 | /* | |
725 | * Here we define all the platform devices that appear | |
726 | * as children of the AB3100. These are regular platform | |
727 | * devices with the IORESOURCE_IO .start and .end set | |
728 | * to correspond to the internal AB3100 register range | |
729 | * mapping to the corresponding subdevice. | |
730 | */ | |
731 | ||
732 | #define AB3100_DEVICE(devname, devid) \ | |
733 | static struct platform_device ab3100_##devname##_device = { \ | |
734 | .name = devid, \ | |
735 | .id = -1, \ | |
736 | } | |
737 | ||
738 | /* | |
739 | * This lists all the subdevices and corresponding register | |
740 | * ranges. | |
741 | */ | |
742 | AB3100_DEVICE(dac, "ab3100-dac"); | |
743 | AB3100_DEVICE(leds, "ab3100-leds"); | |
744 | AB3100_DEVICE(power, "ab3100-power"); | |
745 | AB3100_DEVICE(regulators, "ab3100-regulators"); | |
746 | AB3100_DEVICE(sim, "ab3100-sim"); | |
747 | AB3100_DEVICE(uart, "ab3100-uart"); | |
748 | AB3100_DEVICE(rtc, "ab3100-rtc"); | |
749 | AB3100_DEVICE(charger, "ab3100-charger"); | |
750 | AB3100_DEVICE(boost, "ab3100-boost"); | |
751 | AB3100_DEVICE(adc, "ab3100-adc"); | |
752 | AB3100_DEVICE(fuelgauge, "ab3100-fuelgauge"); | |
753 | AB3100_DEVICE(vibrator, "ab3100-vibrator"); | |
754 | AB3100_DEVICE(otp, "ab3100-otp"); | |
755 | AB3100_DEVICE(codec, "ab3100-codec"); | |
756 | ||
757 | static struct platform_device * | |
758 | ab3100_platform_devs[] = { | |
759 | &ab3100_dac_device, | |
760 | &ab3100_leds_device, | |
761 | &ab3100_power_device, | |
762 | &ab3100_regulators_device, | |
763 | &ab3100_sim_device, | |
764 | &ab3100_uart_device, | |
765 | &ab3100_rtc_device, | |
766 | &ab3100_charger_device, | |
767 | &ab3100_boost_device, | |
768 | &ab3100_adc_device, | |
769 | &ab3100_fuelgauge_device, | |
770 | &ab3100_vibrator_device, | |
771 | &ab3100_otp_device, | |
772 | &ab3100_codec_device, | |
773 | }; | |
774 | ||
775 | struct ab_family_id { | |
776 | u8 id; | |
777 | char *name; | |
778 | }; | |
779 | ||
780 | static const struct ab_family_id ids[] __initdata = { | |
781 | /* AB3100 */ | |
782 | { | |
783 | .id = 0xc0, | |
784 | .name = "P1A" | |
785 | }, { | |
786 | .id = 0xc1, | |
787 | .name = "P1B" | |
788 | }, { | |
789 | .id = 0xc2, | |
790 | .name = "P1C" | |
791 | }, { | |
792 | .id = 0xc3, | |
793 | .name = "P1D" | |
794 | }, { | |
795 | .id = 0xc4, | |
796 | .name = "P1E" | |
797 | }, { | |
798 | .id = 0xc5, | |
799 | .name = "P1F/R1A" | |
800 | }, { | |
801 | .id = 0xc6, | |
802 | .name = "P1G/R1A" | |
803 | }, { | |
804 | .id = 0xc7, | |
805 | .name = "P2A/R2A" | |
806 | }, { | |
807 | .id = 0xc8, | |
808 | .name = "P2B/R2B" | |
809 | }, | |
810 | /* AB3000 variants, not supported */ | |
811 | { | |
812 | .id = 0xa0 | |
813 | }, { | |
814 | .id = 0xa1 | |
815 | }, { | |
816 | .id = 0xa2 | |
817 | }, { | |
818 | .id = 0xa3 | |
819 | }, { | |
820 | .id = 0xa4 | |
821 | }, { | |
822 | .id = 0xa5 | |
823 | }, { | |
824 | .id = 0xa6 | |
825 | }, { | |
826 | .id = 0xa7 | |
827 | }, | |
828 | /* Terminator */ | |
829 | { | |
830 | .id = 0x00, | |
831 | }, | |
832 | }; | |
833 | ||
834 | static int __init ab3100_probe(struct i2c_client *client, | |
835 | const struct i2c_device_id *id) | |
836 | { | |
837 | struct ab3100 *ab3100; | |
d619bc14 LW |
838 | struct ab3100_platform_data *ab3100_plf_data = |
839 | client->dev.platform_data; | |
14fa5691 LW |
840 | int err; |
841 | int i; | |
842 | ||
843 | ab3100 = kzalloc(sizeof(struct ab3100), GFP_KERNEL); | |
844 | if (!ab3100) { | |
845 | dev_err(&client->dev, "could not allocate AB3100 device\n"); | |
846 | return -ENOMEM; | |
847 | } | |
848 | ||
849 | /* Initialize data structure */ | |
850 | mutex_init(&ab3100->access_mutex); | |
851 | BLOCKING_INIT_NOTIFIER_HEAD(&ab3100->event_subscribers); | |
852 | ||
853 | ab3100->i2c_client = client; | |
854 | ab3100->dev = &ab3100->i2c_client->dev; | |
855 | ||
856 | i2c_set_clientdata(client, ab3100); | |
857 | ||
858 | /* Read chip ID register */ | |
956f25a6 LW |
859 | err = ab3100_get_register_interruptible(ab3100, AB3100_CID, |
860 | &ab3100->chip_id); | |
14fa5691 LW |
861 | if (err) { |
862 | dev_err(&client->dev, | |
863 | "could not communicate with the AB3100 analog " | |
864 | "baseband chip\n"); | |
865 | goto exit_no_detect; | |
866 | } | |
867 | ||
868 | for (i = 0; ids[i].id != 0x0; i++) { | |
869 | if (ids[i].id == ab3100->chip_id) { | |
870 | if (ids[i].name != NULL) { | |
871 | snprintf(&ab3100->chip_name[0], | |
872 | sizeof(ab3100->chip_name) - 1, | |
873 | "AB3100 %s", | |
874 | ids[i].name); | |
875 | break; | |
876 | } else { | |
877 | dev_err(&client->dev, | |
878 | "AB3000 is not supported\n"); | |
879 | goto exit_no_detect; | |
880 | } | |
881 | } | |
882 | } | |
883 | ||
884 | if (ids[i].id == 0x0) { | |
885 | dev_err(&client->dev, "unknown analog baseband chip id: 0x%x\n", | |
886 | ab3100->chip_id); | |
887 | dev_err(&client->dev, "accepting it anyway. Please update " | |
888 | "the driver.\n"); | |
889 | goto exit_no_detect; | |
890 | } | |
891 | ||
892 | dev_info(&client->dev, "Detected chip: %s\n", | |
893 | &ab3100->chip_name[0]); | |
894 | ||
895 | /* Attach a second dummy i2c_client to the test register address */ | |
896 | ab3100->testreg_client = i2c_new_dummy(client->adapter, | |
897 | client->addr + 1); | |
898 | if (!ab3100->testreg_client) { | |
899 | err = -ENOMEM; | |
900 | goto exit_no_testreg_client; | |
901 | } | |
902 | ||
14fa5691 LW |
903 | err = ab3100_setup(ab3100); |
904 | if (err) | |
905 | goto exit_no_setup; | |
906 | ||
907 | INIT_WORK(&ab3100->work, ab3100_work); | |
908 | ||
909 | /* This real unpredictable IRQ is of course sampled for entropy */ | |
910 | err = request_irq(client->irq, ab3100_irq_handler, | |
911 | IRQF_DISABLED | IRQF_SAMPLE_RANDOM, | |
912 | "AB3100 IRQ", ab3100); | |
913 | if (err) | |
914 | goto exit_no_irq; | |
915 | ||
916 | /* Set parent and a pointer back to the container in device data */ | |
917 | for (i = 0; i < ARRAY_SIZE(ab3100_platform_devs); i++) { | |
918 | ab3100_platform_devs[i]->dev.parent = | |
919 | &client->dev; | |
d619bc14 LW |
920 | ab3100_platform_devs[i]->dev.platform_data = |
921 | ab3100_plf_data; | |
14fa5691 LW |
922 | platform_set_drvdata(ab3100_platform_devs[i], ab3100); |
923 | } | |
924 | ||
925 | /* Register the platform devices */ | |
926 | platform_add_devices(ab3100_platform_devs, | |
927 | ARRAY_SIZE(ab3100_platform_devs)); | |
928 | ||
929 | ab3100_setup_debugfs(ab3100); | |
930 | ||
931 | return 0; | |
932 | ||
933 | exit_no_irq: | |
934 | exit_no_setup: | |
935 | i2c_unregister_device(ab3100->testreg_client); | |
936 | exit_no_testreg_client: | |
937 | exit_no_detect: | |
938 | kfree(ab3100); | |
939 | return err; | |
940 | } | |
941 | ||
942 | static int __exit ab3100_remove(struct i2c_client *client) | |
943 | { | |
944 | struct ab3100 *ab3100 = i2c_get_clientdata(client); | |
945 | int i; | |
946 | ||
947 | /* Unregister subdevices */ | |
948 | for (i = 0; i < ARRAY_SIZE(ab3100_platform_devs); i++) | |
949 | platform_device_unregister(ab3100_platform_devs[i]); | |
950 | ||
951 | ab3100_remove_debugfs(); | |
952 | i2c_unregister_device(ab3100->testreg_client); | |
953 | ||
954 | /* | |
955 | * At this point, all subscribers should have unregistered | |
956 | * their notifiers so deactivate IRQ | |
957 | */ | |
958 | free_irq(client->irq, ab3100); | |
959 | kfree(ab3100); | |
960 | return 0; | |
961 | } | |
962 | ||
963 | static const struct i2c_device_id ab3100_id[] = { | |
dcffa125 | 964 | { "ab3100", 0 }, |
14fa5691 LW |
965 | { } |
966 | }; | |
967 | MODULE_DEVICE_TABLE(i2c, ab3100_id); | |
968 | ||
969 | static struct i2c_driver ab3100_driver = { | |
970 | .driver = { | |
971 | .name = "ab3100", | |
972 | .owner = THIS_MODULE, | |
973 | }, | |
974 | .id_table = ab3100_id, | |
975 | .probe = ab3100_probe, | |
976 | .remove = __exit_p(ab3100_remove), | |
977 | }; | |
978 | ||
979 | static int __init ab3100_i2c_init(void) | |
980 | { | |
981 | return i2c_add_driver(&ab3100_driver); | |
982 | } | |
983 | ||
984 | static void __exit ab3100_i2c_exit(void) | |
985 | { | |
986 | i2c_del_driver(&ab3100_driver); | |
987 | } | |
988 | ||
989 | subsys_initcall(ab3100_i2c_init); | |
990 | module_exit(ab3100_i2c_exit); | |
991 | ||
992 | MODULE_AUTHOR("Linus Walleij <linus.walleij@stericsson.com>"); | |
993 | MODULE_DESCRIPTION("AB3100 core driver"); | |
994 | MODULE_LICENSE("GPL"); |