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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 | */ | |
60 | static unsigned short normal_i2c[] = { 0x48, I2C_CLIENT_END }; | |
61 | I2C_CLIENT_INSMOD_1(ab3100); | |
62 | ||
63 | u8 ab3100_get_chip_type(struct ab3100 *ab3100) | |
64 | { | |
65 | u8 chip = ABUNKNOWN; | |
66 | ||
67 | switch (ab3100->chip_id & 0xf0) { | |
68 | case 0xa0: | |
69 | chip = AB3000; | |
70 | break; | |
71 | case 0xc0: | |
72 | chip = AB3100; | |
73 | break; | |
74 | } | |
75 | return chip; | |
76 | } | |
77 | EXPORT_SYMBOL(ab3100_get_chip_type); | |
78 | ||
956f25a6 | 79 | int ab3100_set_register_interruptible(struct ab3100 *ab3100, u8 reg, u8 regval) |
14fa5691 LW |
80 | { |
81 | u8 regandval[2] = {reg, regval}; | |
82 | int err; | |
83 | ||
84 | err = mutex_lock_interruptible(&ab3100->access_mutex); | |
85 | if (err) | |
86 | return err; | |
87 | ||
88 | /* | |
89 | * A two-byte write message with the first byte containing the register | |
90 | * number and the second byte containing the value to be written | |
91 | * effectively sets a register in the AB3100. | |
92 | */ | |
93 | err = i2c_master_send(ab3100->i2c_client, regandval, 2); | |
94 | if (err < 0) { | |
95 | dev_err(ab3100->dev, | |
96 | "write error (write register): %d\n", | |
97 | err); | |
98 | } else if (err != 2) { | |
99 | dev_err(ab3100->dev, | |
100 | "write error (write register) " | |
101 | "%d bytes transferred (expected 2)\n", | |
102 | err); | |
103 | err = -EIO; | |
104 | } else { | |
105 | /* All is well */ | |
106 | err = 0; | |
107 | } | |
108 | mutex_unlock(&ab3100->access_mutex); | |
7cdc2b98 | 109 | return err; |
14fa5691 | 110 | } |
956f25a6 LW |
111 | EXPORT_SYMBOL(ab3100_set_register_interruptible); |
112 | ||
14fa5691 LW |
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 | */ | |
956f25a6 | 121 | static int ab3100_set_test_register_interruptible(struct ab3100 *ab3100, |
14fa5691 LW |
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) " | |
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 | ||
956f25a6 LW |
151 | |
152 | int ab3100_get_register_interruptible(struct ab3100 *ab3100, u8 reg, u8 *regval) | |
14fa5691 LW |
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) " | |
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) " | |
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 | } | |
956f25a6 LW |
206 | EXPORT_SYMBOL(ab3100_get_register_interruptible); |
207 | ||
14fa5691 | 208 | |
956f25a6 | 209 | int ab3100_get_register_page_interruptible(struct ab3100 *ab3100, |
14fa5691 LW |
210 | u8 first_reg, u8 *regvals, u8 numregs) |
211 | { | |
212 | int err; | |
213 | ||
214 | if (ab3100->chip_id == 0xa0 || | |
215 | ab3100->chip_id == 0xa1) | |
216 | /* These don't support paged reads */ | |
217 | return -EIO; | |
218 | ||
219 | err = mutex_lock_interruptible(&ab3100->access_mutex); | |
220 | if (err) | |
221 | return err; | |
222 | ||
223 | /* | |
224 | * Paged read also require an I2C "stop" command. | |
225 | */ | |
226 | err = i2c_master_send(ab3100->i2c_client, &first_reg, 1); | |
227 | if (err < 0) { | |
228 | dev_err(ab3100->dev, | |
229 | "write error (send first register address): %d\n", | |
230 | err); | |
231 | goto get_reg_page_out_unlock; | |
232 | } else if (err != 1) { | |
233 | dev_err(ab3100->dev, | |
234 | "write error (send first register address) " | |
235 | "%d bytes transferred (expected 1)\n", | |
236 | err); | |
237 | err = -EIO; | |
238 | goto get_reg_page_out_unlock; | |
239 | } | |
240 | ||
241 | err = i2c_master_recv(ab3100->i2c_client, regvals, numregs); | |
242 | if (err < 0) { | |
243 | dev_err(ab3100->dev, | |
244 | "write error (read register page): %d\n", | |
245 | err); | |
246 | goto get_reg_page_out_unlock; | |
247 | } else if (err != numregs) { | |
248 | dev_err(ab3100->dev, | |
249 | "write error (read register page) " | |
250 | "%d bytes transferred (expected %d)\n", | |
251 | err, numregs); | |
252 | err = -EIO; | |
253 | goto get_reg_page_out_unlock; | |
254 | } | |
255 | ||
256 | /* All is well */ | |
257 | err = 0; | |
258 | ||
259 | get_reg_page_out_unlock: | |
260 | mutex_unlock(&ab3100->access_mutex); | |
261 | return err; | |
262 | } | |
956f25a6 | 263 | EXPORT_SYMBOL(ab3100_get_register_page_interruptible); |
14fa5691 | 264 | |
956f25a6 LW |
265 | |
266 | int ab3100_mask_and_set_register_interruptible(struct ab3100 *ab3100, | |
14fa5691 LW |
267 | u8 reg, u8 andmask, u8 ormask) |
268 | { | |
269 | u8 regandval[2] = {reg, 0}; | |
270 | int err; | |
271 | ||
272 | err = mutex_lock_interruptible(&ab3100->access_mutex); | |
273 | if (err) | |
274 | return err; | |
275 | ||
276 | /* First read out the target register */ | |
277 | err = i2c_master_send(ab3100->i2c_client, ®, 1); | |
278 | if (err < 0) { | |
279 | dev_err(ab3100->dev, | |
280 | "write error (maskset send address): %d\n", | |
281 | err); | |
282 | goto get_maskset_unlock; | |
283 | } else if (err != 1) { | |
284 | dev_err(ab3100->dev, | |
285 | "write error (maskset send address) " | |
286 | "%d bytes transferred (expected 1)\n", | |
287 | err); | |
288 | err = -EIO; | |
289 | goto get_maskset_unlock; | |
290 | } | |
291 | ||
292 | err = i2c_master_recv(ab3100->i2c_client, ®andval[1], 1); | |
293 | if (err < 0) { | |
294 | dev_err(ab3100->dev, | |
295 | "write error (maskset read register): %d\n", | |
296 | err); | |
297 | goto get_maskset_unlock; | |
298 | } else if (err != 1) { | |
299 | dev_err(ab3100->dev, | |
300 | "write error (maskset read register) " | |
301 | "%d bytes transferred (expected 1)\n", | |
302 | err); | |
303 | err = -EIO; | |
304 | goto get_maskset_unlock; | |
305 | } | |
306 | ||
307 | /* Modify the register */ | |
308 | regandval[1] &= andmask; | |
309 | regandval[1] |= ormask; | |
310 | ||
311 | /* Write the register */ | |
312 | err = i2c_master_send(ab3100->i2c_client, regandval, 2); | |
313 | if (err < 0) { | |
314 | dev_err(ab3100->dev, | |
315 | "write error (write register): %d\n", | |
316 | err); | |
317 | goto get_maskset_unlock; | |
318 | } else if (err != 2) { | |
319 | dev_err(ab3100->dev, | |
320 | "write error (write register) " | |
321 | "%d bytes transferred (expected 2)\n", | |
322 | err); | |
323 | err = -EIO; | |
324 | goto get_maskset_unlock; | |
325 | } | |
326 | ||
327 | /* All is well */ | |
328 | err = 0; | |
329 | ||
330 | get_maskset_unlock: | |
331 | mutex_unlock(&ab3100->access_mutex); | |
332 | return err; | |
333 | } | |
956f25a6 LW |
334 | EXPORT_SYMBOL(ab3100_mask_and_set_register_interruptible); |
335 | ||
14fa5691 LW |
336 | |
337 | /* | |
338 | * Register a simple callback for handling any AB3100 events. | |
339 | */ | |
340 | int ab3100_event_register(struct ab3100 *ab3100, | |
341 | struct notifier_block *nb) | |
342 | { | |
343 | return blocking_notifier_chain_register(&ab3100->event_subscribers, | |
344 | nb); | |
345 | } | |
346 | EXPORT_SYMBOL(ab3100_event_register); | |
347 | ||
348 | /* | |
349 | * Remove a previously registered callback. | |
350 | */ | |
351 | int ab3100_event_unregister(struct ab3100 *ab3100, | |
352 | struct notifier_block *nb) | |
353 | { | |
354 | return blocking_notifier_chain_unregister(&ab3100->event_subscribers, | |
355 | nb); | |
356 | } | |
357 | EXPORT_SYMBOL(ab3100_event_unregister); | |
358 | ||
359 | ||
360 | int ab3100_event_registers_startup_state_get(struct ab3100 *ab3100, | |
361 | u32 *fatevent) | |
362 | { | |
363 | if (!ab3100->startup_events_read) | |
364 | return -EAGAIN; /* Try again later */ | |
365 | *fatevent = ab3100->startup_events; | |
366 | return 0; | |
367 | } | |
368 | EXPORT_SYMBOL(ab3100_event_registers_startup_state_get); | |
369 | ||
370 | /* Interrupt handling worker */ | |
371 | static void ab3100_work(struct work_struct *work) | |
372 | { | |
373 | struct ab3100 *ab3100 = container_of(work, struct ab3100, work); | |
374 | u8 event_regs[3]; | |
375 | u32 fatevent; | |
376 | int err; | |
377 | ||
956f25a6 | 378 | err = ab3100_get_register_page_interruptible(ab3100, AB3100_EVENTA1, |
14fa5691 LW |
379 | event_regs, 3); |
380 | if (err) | |
381 | goto err_event_wq; | |
382 | ||
383 | fatevent = (event_regs[0] << 16) | | |
384 | (event_regs[1] << 8) | | |
385 | event_regs[2]; | |
386 | ||
387 | if (!ab3100->startup_events_read) { | |
388 | ab3100->startup_events = fatevent; | |
389 | ab3100->startup_events_read = true; | |
390 | } | |
391 | /* | |
392 | * The notified parties will have to mask out the events | |
393 | * they're interested in and react to them. They will be | |
394 | * notified on all events, then they use the fatevent value | |
395 | * to determine if they're interested. | |
396 | */ | |
397 | blocking_notifier_call_chain(&ab3100->event_subscribers, | |
398 | fatevent, NULL); | |
399 | ||
400 | dev_dbg(ab3100->dev, | |
401 | "IRQ Event: 0x%08x\n", fatevent); | |
402 | ||
403 | /* By now the IRQ should be acked and deasserted so enable it again */ | |
404 | enable_irq(ab3100->i2c_client->irq); | |
405 | return; | |
406 | ||
407 | err_event_wq: | |
408 | dev_dbg(ab3100->dev, | |
409 | "error in event workqueue\n"); | |
410 | /* Enable the IRQ anyway, what choice do we have? */ | |
411 | enable_irq(ab3100->i2c_client->irq); | |
412 | return; | |
413 | } | |
414 | ||
415 | static irqreturn_t ab3100_irq_handler(int irq, void *data) | |
416 | { | |
417 | struct ab3100 *ab3100 = data; | |
418 | /* | |
419 | * Disable the IRQ and dispatch a worker to handle the | |
420 | * event. Since the chip resides on I2C this is slow | |
421 | * stuff and we will re-enable the interrupts once th | |
422 | * worker has finished. | |
423 | */ | |
0ad651c9 | 424 | disable_irq_nosync(irq); |
14fa5691 LW |
425 | schedule_work(&ab3100->work); |
426 | return IRQ_HANDLED; | |
427 | } | |
428 | ||
429 | #ifdef CONFIG_DEBUG_FS | |
430 | /* | |
431 | * Some debugfs entries only exposed if we're using debug | |
432 | */ | |
433 | static int ab3100_registers_print(struct seq_file *s, void *p) | |
434 | { | |
435 | struct ab3100 *ab3100 = s->private; | |
436 | u8 value; | |
437 | u8 reg; | |
438 | ||
439 | seq_printf(s, "AB3100 registers:\n"); | |
440 | ||
441 | for (reg = 0; reg < 0xff; reg++) { | |
956f25a6 | 442 | ab3100_get_register_interruptible(ab3100, reg, &value); |
14fa5691 LW |
443 | seq_printf(s, "[0x%x]: 0x%x\n", reg, value); |
444 | } | |
445 | return 0; | |
446 | } | |
447 | ||
448 | static int ab3100_registers_open(struct inode *inode, struct file *file) | |
449 | { | |
450 | return single_open(file, ab3100_registers_print, inode->i_private); | |
451 | } | |
452 | ||
453 | static const struct file_operations ab3100_registers_fops = { | |
454 | .open = ab3100_registers_open, | |
455 | .read = seq_read, | |
456 | .llseek = seq_lseek, | |
457 | .release = single_release, | |
458 | .owner = THIS_MODULE, | |
459 | }; | |
460 | ||
461 | struct ab3100_get_set_reg_priv { | |
462 | struct ab3100 *ab3100; | |
463 | bool mode; | |
464 | }; | |
465 | ||
466 | static int ab3100_get_set_reg_open_file(struct inode *inode, struct file *file) | |
467 | { | |
468 | file->private_data = inode->i_private; | |
469 | return 0; | |
470 | } | |
471 | ||
dfc3aa72 SO |
472 | static ssize_t ab3100_get_set_reg(struct file *file, |
473 | const char __user *user_buf, | |
474 | size_t count, loff_t *ppos) | |
14fa5691 LW |
475 | { |
476 | struct ab3100_get_set_reg_priv *priv = file->private_data; | |
477 | struct ab3100 *ab3100 = priv->ab3100; | |
478 | char buf[32]; | |
dfc3aa72 | 479 | ssize_t buf_size; |
14fa5691 LW |
480 | int regp; |
481 | unsigned long user_reg; | |
482 | int err; | |
483 | int i = 0; | |
484 | ||
485 | /* Get userspace string and assure termination */ | |
486 | buf_size = min(count, (sizeof(buf)-1)); | |
487 | if (copy_from_user(buf, user_buf, buf_size)) | |
488 | return -EFAULT; | |
489 | buf[buf_size] = 0; | |
490 | ||
491 | /* | |
492 | * The idea is here to parse a string which is either | |
493 | * "0xnn" for reading a register, or "0xaa 0xbb" for | |
494 | * writing 0xbb to the register 0xaa. First move past | |
495 | * whitespace and then begin to parse the register. | |
496 | */ | |
497 | while ((i < buf_size) && (buf[i] == ' ')) | |
498 | i++; | |
499 | regp = i; | |
500 | ||
501 | /* | |
502 | * Advance pointer to end of string then terminate | |
503 | * the register string. This is needed to satisfy | |
504 | * the strict_strtoul() function. | |
505 | */ | |
506 | while ((i < buf_size) && (buf[i] != ' ')) | |
507 | i++; | |
508 | buf[i] = '\0'; | |
509 | ||
510 | err = strict_strtoul(&buf[regp], 16, &user_reg); | |
511 | if (err) | |
512 | return err; | |
513 | if (user_reg > 0xff) | |
514 | return -EINVAL; | |
515 | ||
516 | /* Either we read or we write a register here */ | |
517 | if (!priv->mode) { | |
518 | /* Reading */ | |
519 | u8 reg = (u8) user_reg; | |
520 | u8 regvalue; | |
521 | ||
956f25a6 | 522 | ab3100_get_register_interruptible(ab3100, reg, ®value); |
14fa5691 LW |
523 | |
524 | dev_info(ab3100->dev, | |
525 | "debug read AB3100 reg[0x%02x]: 0x%02x\n", | |
526 | reg, regvalue); | |
527 | } else { | |
528 | int valp; | |
529 | unsigned long user_value; | |
530 | u8 reg = (u8) user_reg; | |
531 | u8 value; | |
532 | u8 regvalue; | |
533 | ||
534 | /* | |
535 | * Writing, we need some value to write to | |
536 | * the register so keep parsing the string | |
537 | * from userspace. | |
538 | */ | |
539 | i++; | |
540 | while ((i < buf_size) && (buf[i] == ' ')) | |
541 | i++; | |
542 | valp = i; | |
543 | while ((i < buf_size) && (buf[i] != ' ')) | |
544 | i++; | |
545 | buf[i] = '\0'; | |
546 | ||
547 | err = strict_strtoul(&buf[valp], 16, &user_value); | |
548 | if (err) | |
549 | return err; | |
550 | if (user_reg > 0xff) | |
551 | return -EINVAL; | |
552 | ||
553 | value = (u8) user_value; | |
956f25a6 LW |
554 | ab3100_set_register_interruptible(ab3100, reg, value); |
555 | ab3100_get_register_interruptible(ab3100, reg, ®value); | |
14fa5691 LW |
556 | |
557 | dev_info(ab3100->dev, | |
558 | "debug write reg[0x%02x] with 0x%02x, " | |
559 | "after readback: 0x%02x\n", | |
560 | reg, value, regvalue); | |
561 | } | |
562 | return buf_size; | |
563 | } | |
564 | ||
565 | static const struct file_operations ab3100_get_set_reg_fops = { | |
566 | .open = ab3100_get_set_reg_open_file, | |
567 | .write = ab3100_get_set_reg, | |
568 | }; | |
569 | ||
570 | static struct dentry *ab3100_dir; | |
571 | static struct dentry *ab3100_reg_file; | |
572 | static struct ab3100_get_set_reg_priv ab3100_get_priv; | |
573 | static struct dentry *ab3100_get_reg_file; | |
574 | static struct ab3100_get_set_reg_priv ab3100_set_priv; | |
575 | static struct dentry *ab3100_set_reg_file; | |
576 | ||
577 | static void ab3100_setup_debugfs(struct ab3100 *ab3100) | |
578 | { | |
579 | int err; | |
580 | ||
581 | ab3100_dir = debugfs_create_dir("ab3100", NULL); | |
582 | if (!ab3100_dir) | |
583 | goto exit_no_debugfs; | |
584 | ||
585 | ab3100_reg_file = debugfs_create_file("registers", | |
586 | S_IRUGO, ab3100_dir, ab3100, | |
587 | &ab3100_registers_fops); | |
588 | if (!ab3100_reg_file) { | |
589 | err = -ENOMEM; | |
590 | goto exit_destroy_dir; | |
591 | } | |
592 | ||
593 | ab3100_get_priv.ab3100 = ab3100; | |
594 | ab3100_get_priv.mode = false; | |
595 | ab3100_get_reg_file = debugfs_create_file("get_reg", | |
596 | S_IWUGO, ab3100_dir, &ab3100_get_priv, | |
597 | &ab3100_get_set_reg_fops); | |
598 | if (!ab3100_get_reg_file) { | |
599 | err = -ENOMEM; | |
600 | goto exit_destroy_reg; | |
601 | } | |
602 | ||
603 | ab3100_set_priv.ab3100 = ab3100; | |
604 | ab3100_set_priv.mode = true; | |
605 | ab3100_set_reg_file = debugfs_create_file("set_reg", | |
606 | S_IWUGO, ab3100_dir, &ab3100_set_priv, | |
607 | &ab3100_get_set_reg_fops); | |
608 | if (!ab3100_set_reg_file) { | |
609 | err = -ENOMEM; | |
610 | goto exit_destroy_get_reg; | |
611 | } | |
612 | return; | |
613 | ||
614 | exit_destroy_get_reg: | |
615 | debugfs_remove(ab3100_get_reg_file); | |
616 | exit_destroy_reg: | |
617 | debugfs_remove(ab3100_reg_file); | |
618 | exit_destroy_dir: | |
619 | debugfs_remove(ab3100_dir); | |
620 | exit_no_debugfs: | |
621 | return; | |
622 | } | |
623 | static inline void ab3100_remove_debugfs(void) | |
624 | { | |
625 | debugfs_remove(ab3100_set_reg_file); | |
626 | debugfs_remove(ab3100_get_reg_file); | |
627 | debugfs_remove(ab3100_reg_file); | |
628 | debugfs_remove(ab3100_dir); | |
629 | } | |
630 | #else | |
631 | static inline void ab3100_setup_debugfs(struct ab3100 *ab3100) | |
632 | { | |
633 | } | |
634 | static inline void ab3100_remove_debugfs(void) | |
635 | { | |
636 | } | |
637 | #endif | |
638 | ||
639 | /* | |
640 | * Basic set-up, datastructure creation/destruction and I2C interface. | |
641 | * This sets up a default config in the AB3100 chip so that it | |
642 | * will work as expected. | |
643 | */ | |
644 | ||
645 | struct ab3100_init_setting { | |
646 | u8 abreg; | |
647 | u8 setting; | |
648 | }; | |
649 | ||
00d3803b | 650 | static const struct ab3100_init_setting __initconst |
14fa5691 LW |
651 | ab3100_init_settings[] = { |
652 | { | |
653 | .abreg = AB3100_MCA, | |
654 | .setting = 0x01 | |
655 | }, { | |
656 | .abreg = AB3100_MCB, | |
657 | .setting = 0x30 | |
658 | }, { | |
659 | .abreg = AB3100_IMRA1, | |
660 | .setting = 0x00 | |
661 | }, { | |
662 | .abreg = AB3100_IMRA2, | |
663 | .setting = 0xFF | |
664 | }, { | |
665 | .abreg = AB3100_IMRA3, | |
666 | .setting = 0x01 | |
667 | }, { | |
668 | .abreg = AB3100_IMRB1, | |
ce290b0e | 669 | .setting = 0xBF |
14fa5691 LW |
670 | }, { |
671 | .abreg = AB3100_IMRB2, | |
672 | .setting = 0xFF | |
673 | }, { | |
674 | .abreg = AB3100_IMRB3, | |
675 | .setting = 0xFF | |
676 | }, { | |
677 | .abreg = AB3100_SUP, | |
678 | .setting = 0x00 | |
679 | }, { | |
680 | .abreg = AB3100_DIS, | |
681 | .setting = 0xF0 | |
682 | }, { | |
683 | .abreg = AB3100_D0C, | |
684 | .setting = 0x00 | |
685 | }, { | |
686 | .abreg = AB3100_D1C, | |
687 | .setting = 0x00 | |
688 | }, { | |
689 | .abreg = AB3100_D2C, | |
690 | .setting = 0x00 | |
691 | }, { | |
692 | .abreg = AB3100_D3C, | |
693 | .setting = 0x00 | |
694 | }, | |
695 | }; | |
696 | ||
697 | static int __init ab3100_setup(struct ab3100 *ab3100) | |
698 | { | |
699 | int err = 0; | |
700 | int i; | |
701 | ||
702 | for (i = 0; i < ARRAY_SIZE(ab3100_init_settings); i++) { | |
956f25a6 | 703 | err = ab3100_set_register_interruptible(ab3100, |
14fa5691 LW |
704 | ab3100_init_settings[i].abreg, |
705 | ab3100_init_settings[i].setting); | |
706 | if (err) | |
707 | goto exit_no_setup; | |
708 | } | |
709 | ||
710 | /* | |
711 | * Special trick to make the AB3100 use the 32kHz clock (RTC) | |
956f25a6 | 712 | * bit 3 in test register 0x02 is a special, undocumented test |
14fa5691 LW |
713 | * register bit that only exist in AB3100 P1E |
714 | */ | |
715 | if (ab3100->chip_id == 0xc4) { | |
716 | dev_warn(ab3100->dev, | |
717 | "AB3100 P1E variant detected, " | |
718 | "forcing chip to 32KHz\n"); | |
956f25a6 | 719 | err = ab3100_set_test_register_interruptible(ab3100, 0x02, 0x08); |
14fa5691 LW |
720 | } |
721 | ||
722 | exit_no_setup: | |
723 | return err; | |
724 | } | |
725 | ||
726 | /* | |
727 | * Here we define all the platform devices that appear | |
728 | * as children of the AB3100. These are regular platform | |
729 | * devices with the IORESOURCE_IO .start and .end set | |
730 | * to correspond to the internal AB3100 register range | |
731 | * mapping to the corresponding subdevice. | |
732 | */ | |
733 | ||
734 | #define AB3100_DEVICE(devname, devid) \ | |
735 | static struct platform_device ab3100_##devname##_device = { \ | |
736 | .name = devid, \ | |
737 | .id = -1, \ | |
738 | } | |
739 | ||
740 | /* | |
741 | * This lists all the subdevices and corresponding register | |
742 | * ranges. | |
743 | */ | |
744 | AB3100_DEVICE(dac, "ab3100-dac"); | |
745 | AB3100_DEVICE(leds, "ab3100-leds"); | |
746 | AB3100_DEVICE(power, "ab3100-power"); | |
747 | AB3100_DEVICE(regulators, "ab3100-regulators"); | |
748 | AB3100_DEVICE(sim, "ab3100-sim"); | |
749 | AB3100_DEVICE(uart, "ab3100-uart"); | |
750 | AB3100_DEVICE(rtc, "ab3100-rtc"); | |
751 | AB3100_DEVICE(charger, "ab3100-charger"); | |
752 | AB3100_DEVICE(boost, "ab3100-boost"); | |
753 | AB3100_DEVICE(adc, "ab3100-adc"); | |
754 | AB3100_DEVICE(fuelgauge, "ab3100-fuelgauge"); | |
755 | AB3100_DEVICE(vibrator, "ab3100-vibrator"); | |
756 | AB3100_DEVICE(otp, "ab3100-otp"); | |
757 | AB3100_DEVICE(codec, "ab3100-codec"); | |
758 | ||
759 | static struct platform_device * | |
760 | ab3100_platform_devs[] = { | |
761 | &ab3100_dac_device, | |
762 | &ab3100_leds_device, | |
763 | &ab3100_power_device, | |
764 | &ab3100_regulators_device, | |
765 | &ab3100_sim_device, | |
766 | &ab3100_uart_device, | |
767 | &ab3100_rtc_device, | |
768 | &ab3100_charger_device, | |
769 | &ab3100_boost_device, | |
770 | &ab3100_adc_device, | |
771 | &ab3100_fuelgauge_device, | |
772 | &ab3100_vibrator_device, | |
773 | &ab3100_otp_device, | |
774 | &ab3100_codec_device, | |
775 | }; | |
776 | ||
777 | struct ab_family_id { | |
778 | u8 id; | |
779 | char *name; | |
780 | }; | |
781 | ||
782 | static const struct ab_family_id ids[] __initdata = { | |
783 | /* AB3100 */ | |
784 | { | |
785 | .id = 0xc0, | |
786 | .name = "P1A" | |
787 | }, { | |
788 | .id = 0xc1, | |
789 | .name = "P1B" | |
790 | }, { | |
791 | .id = 0xc2, | |
792 | .name = "P1C" | |
793 | }, { | |
794 | .id = 0xc3, | |
795 | .name = "P1D" | |
796 | }, { | |
797 | .id = 0xc4, | |
798 | .name = "P1E" | |
799 | }, { | |
800 | .id = 0xc5, | |
801 | .name = "P1F/R1A" | |
802 | }, { | |
803 | .id = 0xc6, | |
804 | .name = "P1G/R1A" | |
805 | }, { | |
806 | .id = 0xc7, | |
807 | .name = "P2A/R2A" | |
808 | }, { | |
809 | .id = 0xc8, | |
810 | .name = "P2B/R2B" | |
811 | }, | |
812 | /* AB3000 variants, not supported */ | |
813 | { | |
814 | .id = 0xa0 | |
815 | }, { | |
816 | .id = 0xa1 | |
817 | }, { | |
818 | .id = 0xa2 | |
819 | }, { | |
820 | .id = 0xa3 | |
821 | }, { | |
822 | .id = 0xa4 | |
823 | }, { | |
824 | .id = 0xa5 | |
825 | }, { | |
826 | .id = 0xa6 | |
827 | }, { | |
828 | .id = 0xa7 | |
829 | }, | |
830 | /* Terminator */ | |
831 | { | |
832 | .id = 0x00, | |
833 | }, | |
834 | }; | |
835 | ||
836 | static int __init ab3100_probe(struct i2c_client *client, | |
837 | const struct i2c_device_id *id) | |
838 | { | |
839 | struct ab3100 *ab3100; | |
d619bc14 LW |
840 | struct ab3100_platform_data *ab3100_plf_data = |
841 | client->dev.platform_data; | |
14fa5691 LW |
842 | int err; |
843 | int i; | |
844 | ||
845 | ab3100 = kzalloc(sizeof(struct ab3100), GFP_KERNEL); | |
846 | if (!ab3100) { | |
847 | dev_err(&client->dev, "could not allocate AB3100 device\n"); | |
848 | return -ENOMEM; | |
849 | } | |
850 | ||
851 | /* Initialize data structure */ | |
852 | mutex_init(&ab3100->access_mutex); | |
853 | BLOCKING_INIT_NOTIFIER_HEAD(&ab3100->event_subscribers); | |
854 | ||
855 | ab3100->i2c_client = client; | |
856 | ab3100->dev = &ab3100->i2c_client->dev; | |
857 | ||
858 | i2c_set_clientdata(client, ab3100); | |
859 | ||
860 | /* Read chip ID register */ | |
956f25a6 LW |
861 | err = ab3100_get_register_interruptible(ab3100, AB3100_CID, |
862 | &ab3100->chip_id); | |
14fa5691 LW |
863 | if (err) { |
864 | dev_err(&client->dev, | |
865 | "could not communicate with the AB3100 analog " | |
866 | "baseband chip\n"); | |
867 | goto exit_no_detect; | |
868 | } | |
869 | ||
870 | for (i = 0; ids[i].id != 0x0; i++) { | |
871 | if (ids[i].id == ab3100->chip_id) { | |
872 | if (ids[i].name != NULL) { | |
873 | snprintf(&ab3100->chip_name[0], | |
874 | sizeof(ab3100->chip_name) - 1, | |
875 | "AB3100 %s", | |
876 | ids[i].name); | |
877 | break; | |
878 | } else { | |
879 | dev_err(&client->dev, | |
880 | "AB3000 is not supported\n"); | |
881 | goto exit_no_detect; | |
882 | } | |
883 | } | |
884 | } | |
885 | ||
886 | if (ids[i].id == 0x0) { | |
887 | dev_err(&client->dev, "unknown analog baseband chip id: 0x%x\n", | |
888 | ab3100->chip_id); | |
889 | dev_err(&client->dev, "accepting it anyway. Please update " | |
890 | "the driver.\n"); | |
891 | goto exit_no_detect; | |
892 | } | |
893 | ||
894 | dev_info(&client->dev, "Detected chip: %s\n", | |
895 | &ab3100->chip_name[0]); | |
896 | ||
897 | /* Attach a second dummy i2c_client to the test register address */ | |
898 | ab3100->testreg_client = i2c_new_dummy(client->adapter, | |
899 | client->addr + 1); | |
900 | if (!ab3100->testreg_client) { | |
901 | err = -ENOMEM; | |
902 | goto exit_no_testreg_client; | |
903 | } | |
904 | ||
905 | strlcpy(ab3100->testreg_client->name, id->name, | |
906 | sizeof(ab3100->testreg_client->name)); | |
907 | ||
908 | err = ab3100_setup(ab3100); | |
909 | if (err) | |
910 | goto exit_no_setup; | |
911 | ||
912 | INIT_WORK(&ab3100->work, ab3100_work); | |
913 | ||
914 | /* This real unpredictable IRQ is of course sampled for entropy */ | |
915 | err = request_irq(client->irq, ab3100_irq_handler, | |
916 | IRQF_DISABLED | IRQF_SAMPLE_RANDOM, | |
917 | "AB3100 IRQ", ab3100); | |
918 | if (err) | |
919 | goto exit_no_irq; | |
920 | ||
921 | /* Set parent and a pointer back to the container in device data */ | |
922 | for (i = 0; i < ARRAY_SIZE(ab3100_platform_devs); i++) { | |
923 | ab3100_platform_devs[i]->dev.parent = | |
924 | &client->dev; | |
d619bc14 LW |
925 | ab3100_platform_devs[i]->dev.platform_data = |
926 | ab3100_plf_data; | |
14fa5691 LW |
927 | platform_set_drvdata(ab3100_platform_devs[i], ab3100); |
928 | } | |
929 | ||
930 | /* Register the platform devices */ | |
931 | platform_add_devices(ab3100_platform_devs, | |
932 | ARRAY_SIZE(ab3100_platform_devs)); | |
933 | ||
934 | ab3100_setup_debugfs(ab3100); | |
935 | ||
936 | return 0; | |
937 | ||
938 | exit_no_irq: | |
939 | exit_no_setup: | |
940 | i2c_unregister_device(ab3100->testreg_client); | |
941 | exit_no_testreg_client: | |
942 | exit_no_detect: | |
943 | kfree(ab3100); | |
944 | return err; | |
945 | } | |
946 | ||
947 | static int __exit ab3100_remove(struct i2c_client *client) | |
948 | { | |
949 | struct ab3100 *ab3100 = i2c_get_clientdata(client); | |
950 | int i; | |
951 | ||
952 | /* Unregister subdevices */ | |
953 | for (i = 0; i < ARRAY_SIZE(ab3100_platform_devs); i++) | |
954 | platform_device_unregister(ab3100_platform_devs[i]); | |
955 | ||
956 | ab3100_remove_debugfs(); | |
957 | i2c_unregister_device(ab3100->testreg_client); | |
958 | ||
959 | /* | |
960 | * At this point, all subscribers should have unregistered | |
961 | * their notifiers so deactivate IRQ | |
962 | */ | |
963 | free_irq(client->irq, ab3100); | |
964 | kfree(ab3100); | |
965 | return 0; | |
966 | } | |
967 | ||
968 | static const struct i2c_device_id ab3100_id[] = { | |
969 | { "ab3100", ab3100 }, | |
970 | { } | |
971 | }; | |
972 | MODULE_DEVICE_TABLE(i2c, ab3100_id); | |
973 | ||
974 | static struct i2c_driver ab3100_driver = { | |
975 | .driver = { | |
976 | .name = "ab3100", | |
977 | .owner = THIS_MODULE, | |
978 | }, | |
979 | .id_table = ab3100_id, | |
980 | .probe = ab3100_probe, | |
981 | .remove = __exit_p(ab3100_remove), | |
982 | }; | |
983 | ||
984 | static int __init ab3100_i2c_init(void) | |
985 | { | |
986 | return i2c_add_driver(&ab3100_driver); | |
987 | } | |
988 | ||
989 | static void __exit ab3100_i2c_exit(void) | |
990 | { | |
991 | i2c_del_driver(&ab3100_driver); | |
992 | } | |
993 | ||
994 | subsys_initcall(ab3100_i2c_init); | |
995 | module_exit(ab3100_i2c_exit); | |
996 | ||
997 | MODULE_AUTHOR("Linus Walleij <linus.walleij@stericsson.com>"); | |
998 | MODULE_DESCRIPTION("AB3100 core driver"); | |
999 | MODULE_LICENSE("GPL"); |