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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> | |
17 | #include <linux/workqueue.h> | |
18 | #include <linux/debugfs.h> | |
19 | #include <linux/seq_file.h> | |
20 | #include <linux/uaccess.h> | |
21 | #include <linux/mfd/ab3100.h> | |
22 | ||
23 | /* These are the only registers inside AB3100 used in this main file */ | |
24 | ||
25 | /* Interrupt event registers */ | |
26 | #define AB3100_EVENTA1 0x21 | |
27 | #define AB3100_EVENTA2 0x22 | |
28 | #define AB3100_EVENTA3 0x23 | |
29 | ||
30 | /* AB3100 DAC converter registers */ | |
31 | #define AB3100_DIS 0x00 | |
32 | #define AB3100_D0C 0x01 | |
33 | #define AB3100_D1C 0x02 | |
34 | #define AB3100_D2C 0x03 | |
35 | #define AB3100_D3C 0x04 | |
36 | ||
37 | /* Chip ID register */ | |
38 | #define AB3100_CID 0x20 | |
39 | ||
40 | /* AB3100 interrupt registers */ | |
41 | #define AB3100_IMRA1 0x24 | |
42 | #define AB3100_IMRA2 0x25 | |
43 | #define AB3100_IMRA3 0x26 | |
44 | #define AB3100_IMRB1 0x2B | |
45 | #define AB3100_IMRB2 0x2C | |
46 | #define AB3100_IMRB3 0x2D | |
47 | ||
48 | /* System Power Monitoring and control registers */ | |
49 | #define AB3100_MCA 0x2E | |
50 | #define AB3100_MCB 0x2F | |
51 | ||
52 | /* SIM power up */ | |
53 | #define AB3100_SUP 0x50 | |
54 | ||
55 | /* | |
56 | * I2C communication | |
57 | * | |
58 | * The AB3100 is usually assigned address 0x48 (7-bit) | |
59 | * The chip is defined in the platform i2c_board_data section. | |
60 | */ | |
61 | static unsigned short normal_i2c[] = { 0x48, I2C_CLIENT_END }; | |
62 | I2C_CLIENT_INSMOD_1(ab3100); | |
63 | ||
64 | u8 ab3100_get_chip_type(struct ab3100 *ab3100) | |
65 | { | |
66 | u8 chip = ABUNKNOWN; | |
67 | ||
68 | switch (ab3100->chip_id & 0xf0) { | |
69 | case 0xa0: | |
70 | chip = AB3000; | |
71 | break; | |
72 | case 0xc0: | |
73 | chip = AB3100; | |
74 | break; | |
75 | } | |
76 | return chip; | |
77 | } | |
78 | EXPORT_SYMBOL(ab3100_get_chip_type); | |
79 | ||
80 | int ab3100_set_register(struct ab3100 *ab3100, u8 reg, u8 regval) | |
81 | { | |
82 | u8 regandval[2] = {reg, regval}; | |
83 | int err; | |
84 | ||
85 | err = mutex_lock_interruptible(&ab3100->access_mutex); | |
86 | if (err) | |
87 | return err; | |
88 | ||
89 | /* | |
90 | * A two-byte write message with the first byte containing the register | |
91 | * number and the second byte containing the value to be written | |
92 | * effectively sets a register in the AB3100. | |
93 | */ | |
94 | err = i2c_master_send(ab3100->i2c_client, regandval, 2); | |
95 | if (err < 0) { | |
96 | dev_err(ab3100->dev, | |
97 | "write error (write register): %d\n", | |
98 | err); | |
99 | } else if (err != 2) { | |
100 | dev_err(ab3100->dev, | |
101 | "write error (write register) " | |
102 | "%d bytes transferred (expected 2)\n", | |
103 | err); | |
104 | err = -EIO; | |
105 | } else { | |
106 | /* All is well */ | |
107 | err = 0; | |
108 | } | |
109 | mutex_unlock(&ab3100->access_mutex); | |
110 | return 0; | |
111 | } | |
112 | EXPORT_SYMBOL(ab3100_set_register); | |
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 | */ | |
121 | static int ab3100_set_test_register(struct ab3100 *ab3100, | |
122 | u8 reg, u8 regval) | |
123 | { | |
124 | u8 regandval[2] = {reg, regval}; | |
125 | int err; | |
126 | ||
127 | err = mutex_lock_interruptible(&ab3100->access_mutex); | |
128 | if (err) | |
129 | return err; | |
130 | ||
131 | err = i2c_master_send(ab3100->testreg_client, regandval, 2); | |
132 | if (err < 0) { | |
133 | dev_err(ab3100->dev, | |
134 | "write error (write test register): %d\n", | |
135 | err); | |
136 | } else if (err != 2) { | |
137 | dev_err(ab3100->dev, | |
138 | "write error (write test register) " | |
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 | ||
151 | int ab3100_get_register(struct ab3100 *ab3100, u8 reg, u8 *regval) | |
152 | { | |
153 | int err; | |
154 | ||
155 | err = mutex_lock_interruptible(&ab3100->access_mutex); | |
156 | if (err) | |
157 | return err; | |
158 | ||
159 | /* | |
160 | * AB3100 require an I2C "stop" command between each message, else | |
161 | * it will not work. The only way of achieveing this with the | |
162 | * message transport layer is to send the read and write messages | |
163 | * separately. | |
164 | */ | |
165 | err = i2c_master_send(ab3100->i2c_client, ®, 1); | |
166 | if (err < 0) { | |
167 | dev_err(ab3100->dev, | |
168 | "write error (send register address): %d\n", | |
169 | err); | |
170 | goto get_reg_out_unlock; | |
171 | } else if (err != 1) { | |
172 | dev_err(ab3100->dev, | |
173 | "write error (send register address) " | |
174 | "%d bytes transferred (expected 1)\n", | |
175 | err); | |
176 | err = -EIO; | |
177 | goto get_reg_out_unlock; | |
178 | } else { | |
179 | /* All is well */ | |
180 | err = 0; | |
181 | } | |
182 | ||
183 | err = i2c_master_recv(ab3100->i2c_client, regval, 1); | |
184 | if (err < 0) { | |
185 | dev_err(ab3100->dev, | |
186 | "write error (read register): %d\n", | |
187 | err); | |
188 | goto get_reg_out_unlock; | |
189 | } else if (err != 1) { | |
190 | dev_err(ab3100->dev, | |
191 | "write error (read register) " | |
192 | "%d bytes transferred (expected 1)\n", | |
193 | err); | |
194 | err = -EIO; | |
195 | goto get_reg_out_unlock; | |
196 | } else { | |
197 | /* All is well */ | |
198 | err = 0; | |
199 | } | |
200 | ||
201 | get_reg_out_unlock: | |
202 | mutex_unlock(&ab3100->access_mutex); | |
203 | return err; | |
204 | } | |
205 | EXPORT_SYMBOL(ab3100_get_register); | |
206 | ||
207 | int ab3100_get_register_page(struct ab3100 *ab3100, | |
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 | } | |
261 | EXPORT_SYMBOL(ab3100_get_register_page); | |
262 | ||
263 | int ab3100_mask_and_set_register(struct ab3100 *ab3100, | |
264 | u8 reg, u8 andmask, u8 ormask) | |
265 | { | |
266 | u8 regandval[2] = {reg, 0}; | |
267 | int err; | |
268 | ||
269 | err = mutex_lock_interruptible(&ab3100->access_mutex); | |
270 | if (err) | |
271 | return err; | |
272 | ||
273 | /* First read out the target register */ | |
274 | err = i2c_master_send(ab3100->i2c_client, ®, 1); | |
275 | if (err < 0) { | |
276 | dev_err(ab3100->dev, | |
277 | "write error (maskset send address): %d\n", | |
278 | err); | |
279 | goto get_maskset_unlock; | |
280 | } else if (err != 1) { | |
281 | dev_err(ab3100->dev, | |
282 | "write error (maskset send address) " | |
283 | "%d bytes transferred (expected 1)\n", | |
284 | err); | |
285 | err = -EIO; | |
286 | goto get_maskset_unlock; | |
287 | } | |
288 | ||
289 | err = i2c_master_recv(ab3100->i2c_client, ®andval[1], 1); | |
290 | if (err < 0) { | |
291 | dev_err(ab3100->dev, | |
292 | "write error (maskset read register): %d\n", | |
293 | err); | |
294 | goto get_maskset_unlock; | |
295 | } else if (err != 1) { | |
296 | dev_err(ab3100->dev, | |
297 | "write error (maskset read register) " | |
298 | "%d bytes transferred (expected 1)\n", | |
299 | err); | |
300 | err = -EIO; | |
301 | goto get_maskset_unlock; | |
302 | } | |
303 | ||
304 | /* Modify the register */ | |
305 | regandval[1] &= andmask; | |
306 | regandval[1] |= ormask; | |
307 | ||
308 | /* Write the register */ | |
309 | err = i2c_master_send(ab3100->i2c_client, regandval, 2); | |
310 | if (err < 0) { | |
311 | dev_err(ab3100->dev, | |
312 | "write error (write register): %d\n", | |
313 | err); | |
314 | goto get_maskset_unlock; | |
315 | } else if (err != 2) { | |
316 | dev_err(ab3100->dev, | |
317 | "write error (write register) " | |
318 | "%d bytes transferred (expected 2)\n", | |
319 | err); | |
320 | err = -EIO; | |
321 | goto get_maskset_unlock; | |
322 | } | |
323 | ||
324 | /* All is well */ | |
325 | err = 0; | |
326 | ||
327 | get_maskset_unlock: | |
328 | mutex_unlock(&ab3100->access_mutex); | |
329 | return err; | |
330 | } | |
331 | EXPORT_SYMBOL(ab3100_mask_and_set_register); | |
332 | ||
333 | /* | |
334 | * Register a simple callback for handling any AB3100 events. | |
335 | */ | |
336 | int ab3100_event_register(struct ab3100 *ab3100, | |
337 | struct notifier_block *nb) | |
338 | { | |
339 | return blocking_notifier_chain_register(&ab3100->event_subscribers, | |
340 | nb); | |
341 | } | |
342 | EXPORT_SYMBOL(ab3100_event_register); | |
343 | ||
344 | /* | |
345 | * Remove a previously registered callback. | |
346 | */ | |
347 | int ab3100_event_unregister(struct ab3100 *ab3100, | |
348 | struct notifier_block *nb) | |
349 | { | |
350 | return blocking_notifier_chain_unregister(&ab3100->event_subscribers, | |
351 | nb); | |
352 | } | |
353 | EXPORT_SYMBOL(ab3100_event_unregister); | |
354 | ||
355 | ||
356 | int ab3100_event_registers_startup_state_get(struct ab3100 *ab3100, | |
357 | u32 *fatevent) | |
358 | { | |
359 | if (!ab3100->startup_events_read) | |
360 | return -EAGAIN; /* Try again later */ | |
361 | *fatevent = ab3100->startup_events; | |
362 | return 0; | |
363 | } | |
364 | EXPORT_SYMBOL(ab3100_event_registers_startup_state_get); | |
365 | ||
366 | /* Interrupt handling worker */ | |
367 | static void ab3100_work(struct work_struct *work) | |
368 | { | |
369 | struct ab3100 *ab3100 = container_of(work, struct ab3100, work); | |
370 | u8 event_regs[3]; | |
371 | u32 fatevent; | |
372 | int err; | |
373 | ||
374 | err = ab3100_get_register_page(ab3100, AB3100_EVENTA1, | |
375 | event_regs, 3); | |
376 | if (err) | |
377 | goto err_event_wq; | |
378 | ||
379 | fatevent = (event_regs[0] << 16) | | |
380 | (event_regs[1] << 8) | | |
381 | event_regs[2]; | |
382 | ||
383 | if (!ab3100->startup_events_read) { | |
384 | ab3100->startup_events = fatevent; | |
385 | ab3100->startup_events_read = true; | |
386 | } | |
387 | /* | |
388 | * The notified parties will have to mask out the events | |
389 | * they're interested in and react to them. They will be | |
390 | * notified on all events, then they use the fatevent value | |
391 | * to determine if they're interested. | |
392 | */ | |
393 | blocking_notifier_call_chain(&ab3100->event_subscribers, | |
394 | fatevent, NULL); | |
395 | ||
396 | dev_dbg(ab3100->dev, | |
397 | "IRQ Event: 0x%08x\n", fatevent); | |
398 | ||
399 | /* By now the IRQ should be acked and deasserted so enable it again */ | |
400 | enable_irq(ab3100->i2c_client->irq); | |
401 | return; | |
402 | ||
403 | err_event_wq: | |
404 | dev_dbg(ab3100->dev, | |
405 | "error in event workqueue\n"); | |
406 | /* Enable the IRQ anyway, what choice do we have? */ | |
407 | enable_irq(ab3100->i2c_client->irq); | |
408 | return; | |
409 | } | |
410 | ||
411 | static irqreturn_t ab3100_irq_handler(int irq, void *data) | |
412 | { | |
413 | struct ab3100 *ab3100 = data; | |
414 | /* | |
415 | * Disable the IRQ and dispatch a worker to handle the | |
416 | * event. Since the chip resides on I2C this is slow | |
417 | * stuff and we will re-enable the interrupts once th | |
418 | * worker has finished. | |
419 | */ | |
420 | disable_irq(ab3100->i2c_client->irq); | |
421 | schedule_work(&ab3100->work); | |
422 | return IRQ_HANDLED; | |
423 | } | |
424 | ||
425 | #ifdef CONFIG_DEBUG_FS | |
426 | /* | |
427 | * Some debugfs entries only exposed if we're using debug | |
428 | */ | |
429 | static int ab3100_registers_print(struct seq_file *s, void *p) | |
430 | { | |
431 | struct ab3100 *ab3100 = s->private; | |
432 | u8 value; | |
433 | u8 reg; | |
434 | ||
435 | seq_printf(s, "AB3100 registers:\n"); | |
436 | ||
437 | for (reg = 0; reg < 0xff; reg++) { | |
438 | ab3100_get_register(ab3100, reg, &value); | |
439 | seq_printf(s, "[0x%x]: 0x%x\n", reg, value); | |
440 | } | |
441 | return 0; | |
442 | } | |
443 | ||
444 | static int ab3100_registers_open(struct inode *inode, struct file *file) | |
445 | { | |
446 | return single_open(file, ab3100_registers_print, inode->i_private); | |
447 | } | |
448 | ||
449 | static const struct file_operations ab3100_registers_fops = { | |
450 | .open = ab3100_registers_open, | |
451 | .read = seq_read, | |
452 | .llseek = seq_lseek, | |
453 | .release = single_release, | |
454 | .owner = THIS_MODULE, | |
455 | }; | |
456 | ||
457 | struct ab3100_get_set_reg_priv { | |
458 | struct ab3100 *ab3100; | |
459 | bool mode; | |
460 | }; | |
461 | ||
462 | static int ab3100_get_set_reg_open_file(struct inode *inode, struct file *file) | |
463 | { | |
464 | file->private_data = inode->i_private; | |
465 | return 0; | |
466 | } | |
467 | ||
468 | static int ab3100_get_set_reg(struct file *file, | |
469 | const char __user *user_buf, | |
470 | size_t count, loff_t *ppos) | |
471 | { | |
472 | struct ab3100_get_set_reg_priv *priv = file->private_data; | |
473 | struct ab3100 *ab3100 = priv->ab3100; | |
474 | char buf[32]; | |
475 | int buf_size; | |
476 | int regp; | |
477 | unsigned long user_reg; | |
478 | int err; | |
479 | int i = 0; | |
480 | ||
481 | /* Get userspace string and assure termination */ | |
482 | buf_size = min(count, (sizeof(buf)-1)); | |
483 | if (copy_from_user(buf, user_buf, buf_size)) | |
484 | return -EFAULT; | |
485 | buf[buf_size] = 0; | |
486 | ||
487 | /* | |
488 | * The idea is here to parse a string which is either | |
489 | * "0xnn" for reading a register, or "0xaa 0xbb" for | |
490 | * writing 0xbb to the register 0xaa. First move past | |
491 | * whitespace and then begin to parse the register. | |
492 | */ | |
493 | while ((i < buf_size) && (buf[i] == ' ')) | |
494 | i++; | |
495 | regp = i; | |
496 | ||
497 | /* | |
498 | * Advance pointer to end of string then terminate | |
499 | * the register string. This is needed to satisfy | |
500 | * the strict_strtoul() function. | |
501 | */ | |
502 | while ((i < buf_size) && (buf[i] != ' ')) | |
503 | i++; | |
504 | buf[i] = '\0'; | |
505 | ||
506 | err = strict_strtoul(&buf[regp], 16, &user_reg); | |
507 | if (err) | |
508 | return err; | |
509 | if (user_reg > 0xff) | |
510 | return -EINVAL; | |
511 | ||
512 | /* Either we read or we write a register here */ | |
513 | if (!priv->mode) { | |
514 | /* Reading */ | |
515 | u8 reg = (u8) user_reg; | |
516 | u8 regvalue; | |
517 | ||
518 | ab3100_get_register(ab3100, reg, ®value); | |
519 | ||
520 | dev_info(ab3100->dev, | |
521 | "debug read AB3100 reg[0x%02x]: 0x%02x\n", | |
522 | reg, regvalue); | |
523 | } else { | |
524 | int valp; | |
525 | unsigned long user_value; | |
526 | u8 reg = (u8) user_reg; | |
527 | u8 value; | |
528 | u8 regvalue; | |
529 | ||
530 | /* | |
531 | * Writing, we need some value to write to | |
532 | * the register so keep parsing the string | |
533 | * from userspace. | |
534 | */ | |
535 | i++; | |
536 | while ((i < buf_size) && (buf[i] == ' ')) | |
537 | i++; | |
538 | valp = i; | |
539 | while ((i < buf_size) && (buf[i] != ' ')) | |
540 | i++; | |
541 | buf[i] = '\0'; | |
542 | ||
543 | err = strict_strtoul(&buf[valp], 16, &user_value); | |
544 | if (err) | |
545 | return err; | |
546 | if (user_reg > 0xff) | |
547 | return -EINVAL; | |
548 | ||
549 | value = (u8) user_value; | |
550 | ab3100_set_register(ab3100, reg, value); | |
551 | ab3100_get_register(ab3100, reg, ®value); | |
552 | ||
553 | dev_info(ab3100->dev, | |
554 | "debug write reg[0x%02x] with 0x%02x, " | |
555 | "after readback: 0x%02x\n", | |
556 | reg, value, regvalue); | |
557 | } | |
558 | return buf_size; | |
559 | } | |
560 | ||
561 | static const struct file_operations ab3100_get_set_reg_fops = { | |
562 | .open = ab3100_get_set_reg_open_file, | |
563 | .write = ab3100_get_set_reg, | |
564 | }; | |
565 | ||
566 | static struct dentry *ab3100_dir; | |
567 | static struct dentry *ab3100_reg_file; | |
568 | static struct ab3100_get_set_reg_priv ab3100_get_priv; | |
569 | static struct dentry *ab3100_get_reg_file; | |
570 | static struct ab3100_get_set_reg_priv ab3100_set_priv; | |
571 | static struct dentry *ab3100_set_reg_file; | |
572 | ||
573 | static void ab3100_setup_debugfs(struct ab3100 *ab3100) | |
574 | { | |
575 | int err; | |
576 | ||
577 | ab3100_dir = debugfs_create_dir("ab3100", NULL); | |
578 | if (!ab3100_dir) | |
579 | goto exit_no_debugfs; | |
580 | ||
581 | ab3100_reg_file = debugfs_create_file("registers", | |
582 | S_IRUGO, ab3100_dir, ab3100, | |
583 | &ab3100_registers_fops); | |
584 | if (!ab3100_reg_file) { | |
585 | err = -ENOMEM; | |
586 | goto exit_destroy_dir; | |
587 | } | |
588 | ||
589 | ab3100_get_priv.ab3100 = ab3100; | |
590 | ab3100_get_priv.mode = false; | |
591 | ab3100_get_reg_file = debugfs_create_file("get_reg", | |
592 | S_IWUGO, ab3100_dir, &ab3100_get_priv, | |
593 | &ab3100_get_set_reg_fops); | |
594 | if (!ab3100_get_reg_file) { | |
595 | err = -ENOMEM; | |
596 | goto exit_destroy_reg; | |
597 | } | |
598 | ||
599 | ab3100_set_priv.ab3100 = ab3100; | |
600 | ab3100_set_priv.mode = true; | |
601 | ab3100_set_reg_file = debugfs_create_file("set_reg", | |
602 | S_IWUGO, ab3100_dir, &ab3100_set_priv, | |
603 | &ab3100_get_set_reg_fops); | |
604 | if (!ab3100_set_reg_file) { | |
605 | err = -ENOMEM; | |
606 | goto exit_destroy_get_reg; | |
607 | } | |
608 | return; | |
609 | ||
610 | exit_destroy_get_reg: | |
611 | debugfs_remove(ab3100_get_reg_file); | |
612 | exit_destroy_reg: | |
613 | debugfs_remove(ab3100_reg_file); | |
614 | exit_destroy_dir: | |
615 | debugfs_remove(ab3100_dir); | |
616 | exit_no_debugfs: | |
617 | return; | |
618 | } | |
619 | static inline void ab3100_remove_debugfs(void) | |
620 | { | |
621 | debugfs_remove(ab3100_set_reg_file); | |
622 | debugfs_remove(ab3100_get_reg_file); | |
623 | debugfs_remove(ab3100_reg_file); | |
624 | debugfs_remove(ab3100_dir); | |
625 | } | |
626 | #else | |
627 | static inline void ab3100_setup_debugfs(struct ab3100 *ab3100) | |
628 | { | |
629 | } | |
630 | static inline void ab3100_remove_debugfs(void) | |
631 | { | |
632 | } | |
633 | #endif | |
634 | ||
635 | /* | |
636 | * Basic set-up, datastructure creation/destruction and I2C interface. | |
637 | * This sets up a default config in the AB3100 chip so that it | |
638 | * will work as expected. | |
639 | */ | |
640 | ||
641 | struct ab3100_init_setting { | |
642 | u8 abreg; | |
643 | u8 setting; | |
644 | }; | |
645 | ||
646 | static const struct ab3100_init_setting __initdata | |
647 | ab3100_init_settings[] = { | |
648 | { | |
649 | .abreg = AB3100_MCA, | |
650 | .setting = 0x01 | |
651 | }, { | |
652 | .abreg = AB3100_MCB, | |
653 | .setting = 0x30 | |
654 | }, { | |
655 | .abreg = AB3100_IMRA1, | |
656 | .setting = 0x00 | |
657 | }, { | |
658 | .abreg = AB3100_IMRA2, | |
659 | .setting = 0xFF | |
660 | }, { | |
661 | .abreg = AB3100_IMRA3, | |
662 | .setting = 0x01 | |
663 | }, { | |
664 | .abreg = AB3100_IMRB1, | |
665 | .setting = 0xFF | |
666 | }, { | |
667 | .abreg = AB3100_IMRB2, | |
668 | .setting = 0xFF | |
669 | }, { | |
670 | .abreg = AB3100_IMRB3, | |
671 | .setting = 0xFF | |
672 | }, { | |
673 | .abreg = AB3100_SUP, | |
674 | .setting = 0x00 | |
675 | }, { | |
676 | .abreg = AB3100_DIS, | |
677 | .setting = 0xF0 | |
678 | }, { | |
679 | .abreg = AB3100_D0C, | |
680 | .setting = 0x00 | |
681 | }, { | |
682 | .abreg = AB3100_D1C, | |
683 | .setting = 0x00 | |
684 | }, { | |
685 | .abreg = AB3100_D2C, | |
686 | .setting = 0x00 | |
687 | }, { | |
688 | .abreg = AB3100_D3C, | |
689 | .setting = 0x00 | |
690 | }, | |
691 | }; | |
692 | ||
693 | static int __init ab3100_setup(struct ab3100 *ab3100) | |
694 | { | |
695 | int err = 0; | |
696 | int i; | |
697 | ||
698 | for (i = 0; i < ARRAY_SIZE(ab3100_init_settings); i++) { | |
699 | err = ab3100_set_register(ab3100, | |
700 | ab3100_init_settings[i].abreg, | |
701 | ab3100_init_settings[i].setting); | |
702 | if (err) | |
703 | goto exit_no_setup; | |
704 | } | |
705 | ||
706 | /* | |
707 | * Special trick to make the AB3100 use the 32kHz clock (RTC) | |
708 | * bit 3 in test registe 0x02 is a special, undocumented test | |
709 | * register bit that only exist in AB3100 P1E | |
710 | */ | |
711 | if (ab3100->chip_id == 0xc4) { | |
712 | dev_warn(ab3100->dev, | |
713 | "AB3100 P1E variant detected, " | |
714 | "forcing chip to 32KHz\n"); | |
715 | err = ab3100_set_test_register(ab3100, 0x02, 0x08); | |
716 | } | |
717 | ||
718 | exit_no_setup: | |
719 | return err; | |
720 | } | |
721 | ||
722 | /* | |
723 | * Here we define all the platform devices that appear | |
724 | * as children of the AB3100. These are regular platform | |
725 | * devices with the IORESOURCE_IO .start and .end set | |
726 | * to correspond to the internal AB3100 register range | |
727 | * mapping to the corresponding subdevice. | |
728 | */ | |
729 | ||
730 | #define AB3100_DEVICE(devname, devid) \ | |
731 | static struct platform_device ab3100_##devname##_device = { \ | |
732 | .name = devid, \ | |
733 | .id = -1, \ | |
734 | } | |
735 | ||
736 | /* | |
737 | * This lists all the subdevices and corresponding register | |
738 | * ranges. | |
739 | */ | |
740 | AB3100_DEVICE(dac, "ab3100-dac"); | |
741 | AB3100_DEVICE(leds, "ab3100-leds"); | |
742 | AB3100_DEVICE(power, "ab3100-power"); | |
743 | AB3100_DEVICE(regulators, "ab3100-regulators"); | |
744 | AB3100_DEVICE(sim, "ab3100-sim"); | |
745 | AB3100_DEVICE(uart, "ab3100-uart"); | |
746 | AB3100_DEVICE(rtc, "ab3100-rtc"); | |
747 | AB3100_DEVICE(charger, "ab3100-charger"); | |
748 | AB3100_DEVICE(boost, "ab3100-boost"); | |
749 | AB3100_DEVICE(adc, "ab3100-adc"); | |
750 | AB3100_DEVICE(fuelgauge, "ab3100-fuelgauge"); | |
751 | AB3100_DEVICE(vibrator, "ab3100-vibrator"); | |
752 | AB3100_DEVICE(otp, "ab3100-otp"); | |
753 | AB3100_DEVICE(codec, "ab3100-codec"); | |
754 | ||
755 | static struct platform_device * | |
756 | ab3100_platform_devs[] = { | |
757 | &ab3100_dac_device, | |
758 | &ab3100_leds_device, | |
759 | &ab3100_power_device, | |
760 | &ab3100_regulators_device, | |
761 | &ab3100_sim_device, | |
762 | &ab3100_uart_device, | |
763 | &ab3100_rtc_device, | |
764 | &ab3100_charger_device, | |
765 | &ab3100_boost_device, | |
766 | &ab3100_adc_device, | |
767 | &ab3100_fuelgauge_device, | |
768 | &ab3100_vibrator_device, | |
769 | &ab3100_otp_device, | |
770 | &ab3100_codec_device, | |
771 | }; | |
772 | ||
773 | struct ab_family_id { | |
774 | u8 id; | |
775 | char *name; | |
776 | }; | |
777 | ||
778 | static const struct ab_family_id ids[] __initdata = { | |
779 | /* AB3100 */ | |
780 | { | |
781 | .id = 0xc0, | |
782 | .name = "P1A" | |
783 | }, { | |
784 | .id = 0xc1, | |
785 | .name = "P1B" | |
786 | }, { | |
787 | .id = 0xc2, | |
788 | .name = "P1C" | |
789 | }, { | |
790 | .id = 0xc3, | |
791 | .name = "P1D" | |
792 | }, { | |
793 | .id = 0xc4, | |
794 | .name = "P1E" | |
795 | }, { | |
796 | .id = 0xc5, | |
797 | .name = "P1F/R1A" | |
798 | }, { | |
799 | .id = 0xc6, | |
800 | .name = "P1G/R1A" | |
801 | }, { | |
802 | .id = 0xc7, | |
803 | .name = "P2A/R2A" | |
804 | }, { | |
805 | .id = 0xc8, | |
806 | .name = "P2B/R2B" | |
807 | }, | |
808 | /* AB3000 variants, not supported */ | |
809 | { | |
810 | .id = 0xa0 | |
811 | }, { | |
812 | .id = 0xa1 | |
813 | }, { | |
814 | .id = 0xa2 | |
815 | }, { | |
816 | .id = 0xa3 | |
817 | }, { | |
818 | .id = 0xa4 | |
819 | }, { | |
820 | .id = 0xa5 | |
821 | }, { | |
822 | .id = 0xa6 | |
823 | }, { | |
824 | .id = 0xa7 | |
825 | }, | |
826 | /* Terminator */ | |
827 | { | |
828 | .id = 0x00, | |
829 | }, | |
830 | }; | |
831 | ||
832 | static int __init ab3100_probe(struct i2c_client *client, | |
833 | const struct i2c_device_id *id) | |
834 | { | |
835 | struct ab3100 *ab3100; | |
836 | int err; | |
837 | int i; | |
838 | ||
839 | ab3100 = kzalloc(sizeof(struct ab3100), GFP_KERNEL); | |
840 | if (!ab3100) { | |
841 | dev_err(&client->dev, "could not allocate AB3100 device\n"); | |
842 | return -ENOMEM; | |
843 | } | |
844 | ||
845 | /* Initialize data structure */ | |
846 | mutex_init(&ab3100->access_mutex); | |
847 | BLOCKING_INIT_NOTIFIER_HEAD(&ab3100->event_subscribers); | |
848 | ||
849 | ab3100->i2c_client = client; | |
850 | ab3100->dev = &ab3100->i2c_client->dev; | |
851 | ||
852 | i2c_set_clientdata(client, ab3100); | |
853 | ||
854 | /* Read chip ID register */ | |
855 | err = ab3100_get_register(ab3100, AB3100_CID, | |
856 | &ab3100->chip_id); | |
857 | if (err) { | |
858 | dev_err(&client->dev, | |
859 | "could not communicate with the AB3100 analog " | |
860 | "baseband chip\n"); | |
861 | goto exit_no_detect; | |
862 | } | |
863 | ||
864 | for (i = 0; ids[i].id != 0x0; i++) { | |
865 | if (ids[i].id == ab3100->chip_id) { | |
866 | if (ids[i].name != NULL) { | |
867 | snprintf(&ab3100->chip_name[0], | |
868 | sizeof(ab3100->chip_name) - 1, | |
869 | "AB3100 %s", | |
870 | ids[i].name); | |
871 | break; | |
872 | } else { | |
873 | dev_err(&client->dev, | |
874 | "AB3000 is not supported\n"); | |
875 | goto exit_no_detect; | |
876 | } | |
877 | } | |
878 | } | |
879 | ||
880 | if (ids[i].id == 0x0) { | |
881 | dev_err(&client->dev, "unknown analog baseband chip id: 0x%x\n", | |
882 | ab3100->chip_id); | |
883 | dev_err(&client->dev, "accepting it anyway. Please update " | |
884 | "the driver.\n"); | |
885 | goto exit_no_detect; | |
886 | } | |
887 | ||
888 | dev_info(&client->dev, "Detected chip: %s\n", | |
889 | &ab3100->chip_name[0]); | |
890 | ||
891 | /* Attach a second dummy i2c_client to the test register address */ | |
892 | ab3100->testreg_client = i2c_new_dummy(client->adapter, | |
893 | client->addr + 1); | |
894 | if (!ab3100->testreg_client) { | |
895 | err = -ENOMEM; | |
896 | goto exit_no_testreg_client; | |
897 | } | |
898 | ||
899 | strlcpy(ab3100->testreg_client->name, id->name, | |
900 | sizeof(ab3100->testreg_client->name)); | |
901 | ||
902 | err = ab3100_setup(ab3100); | |
903 | if (err) | |
904 | goto exit_no_setup; | |
905 | ||
906 | INIT_WORK(&ab3100->work, ab3100_work); | |
907 | ||
908 | /* This real unpredictable IRQ is of course sampled for entropy */ | |
909 | err = request_irq(client->irq, ab3100_irq_handler, | |
910 | IRQF_DISABLED | IRQF_SAMPLE_RANDOM, | |
911 | "AB3100 IRQ", ab3100); | |
912 | if (err) | |
913 | goto exit_no_irq; | |
914 | ||
915 | /* Set parent and a pointer back to the container in device data */ | |
916 | for (i = 0; i < ARRAY_SIZE(ab3100_platform_devs); i++) { | |
917 | ab3100_platform_devs[i]->dev.parent = | |
918 | &client->dev; | |
919 | platform_set_drvdata(ab3100_platform_devs[i], ab3100); | |
920 | } | |
921 | ||
922 | /* Register the platform devices */ | |
923 | platform_add_devices(ab3100_platform_devs, | |
924 | ARRAY_SIZE(ab3100_platform_devs)); | |
925 | ||
926 | ab3100_setup_debugfs(ab3100); | |
927 | ||
928 | return 0; | |
929 | ||
930 | exit_no_irq: | |
931 | exit_no_setup: | |
932 | i2c_unregister_device(ab3100->testreg_client); | |
933 | exit_no_testreg_client: | |
934 | exit_no_detect: | |
935 | kfree(ab3100); | |
936 | return err; | |
937 | } | |
938 | ||
939 | static int __exit ab3100_remove(struct i2c_client *client) | |
940 | { | |
941 | struct ab3100 *ab3100 = i2c_get_clientdata(client); | |
942 | int i; | |
943 | ||
944 | /* Unregister subdevices */ | |
945 | for (i = 0; i < ARRAY_SIZE(ab3100_platform_devs); i++) | |
946 | platform_device_unregister(ab3100_platform_devs[i]); | |
947 | ||
948 | ab3100_remove_debugfs(); | |
949 | i2c_unregister_device(ab3100->testreg_client); | |
950 | ||
951 | /* | |
952 | * At this point, all subscribers should have unregistered | |
953 | * their notifiers so deactivate IRQ | |
954 | */ | |
955 | free_irq(client->irq, ab3100); | |
956 | kfree(ab3100); | |
957 | return 0; | |
958 | } | |
959 | ||
960 | static const struct i2c_device_id ab3100_id[] = { | |
961 | { "ab3100", ab3100 }, | |
962 | { } | |
963 | }; | |
964 | MODULE_DEVICE_TABLE(i2c, ab3100_id); | |
965 | ||
966 | static struct i2c_driver ab3100_driver = { | |
967 | .driver = { | |
968 | .name = "ab3100", | |
969 | .owner = THIS_MODULE, | |
970 | }, | |
971 | .id_table = ab3100_id, | |
972 | .probe = ab3100_probe, | |
973 | .remove = __exit_p(ab3100_remove), | |
974 | }; | |
975 | ||
976 | static int __init ab3100_i2c_init(void) | |
977 | { | |
978 | return i2c_add_driver(&ab3100_driver); | |
979 | } | |
980 | ||
981 | static void __exit ab3100_i2c_exit(void) | |
982 | { | |
983 | i2c_del_driver(&ab3100_driver); | |
984 | } | |
985 | ||
986 | subsys_initcall(ab3100_i2c_init); | |
987 | module_exit(ab3100_i2c_exit); | |
988 | ||
989 | MODULE_AUTHOR("Linus Walleij <linus.walleij@stericsson.com>"); | |
990 | MODULE_DESCRIPTION("AB3100 core driver"); | |
991 | MODULE_LICENSE("GPL"); |