Commit | Line | Data |
---|---|---|
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 | ||
0df883df LW |
368 | /* |
369 | * This is a threaded interrupt handler so we can make some | |
370 | * I2C calls etc. | |
371 | */ | |
372 | static irqreturn_t ab3100_irq_handler(int irq, void *data) | |
14fa5691 | 373 | { |
0df883df | 374 | struct ab3100 *ab3100 = data; |
14fa5691 LW |
375 | u8 event_regs[3]; |
376 | u32 fatevent; | |
377 | int err; | |
378 | ||
956f25a6 | 379 | err = ab3100_get_register_page_interruptible(ab3100, AB3100_EVENTA1, |
14fa5691 LW |
380 | event_regs, 3); |
381 | if (err) | |
0df883df | 382 | goto err_event; |
14fa5691 LW |
383 | |
384 | fatevent = (event_regs[0] << 16) | | |
385 | (event_regs[1] << 8) | | |
386 | event_regs[2]; | |
387 | ||
388 | if (!ab3100->startup_events_read) { | |
389 | ab3100->startup_events = fatevent; | |
390 | ab3100->startup_events_read = true; | |
391 | } | |
392 | /* | |
393 | * The notified parties will have to mask out the events | |
394 | * they're interested in and react to them. They will be | |
395 | * notified on all events, then they use the fatevent value | |
396 | * to determine if they're interested. | |
397 | */ | |
398 | blocking_notifier_call_chain(&ab3100->event_subscribers, | |
399 | fatevent, NULL); | |
400 | ||
401 | dev_dbg(ab3100->dev, | |
402 | "IRQ Event: 0x%08x\n", fatevent); | |
403 | ||
0df883df | 404 | return IRQ_HANDLED; |
14fa5691 | 405 | |
0df883df | 406 | err_event: |
14fa5691 | 407 | dev_dbg(ab3100->dev, |
0df883df | 408 | "error reading event status\n"); |
14fa5691 LW |
409 | return IRQ_HANDLED; |
410 | } | |
411 | ||
412 | #ifdef CONFIG_DEBUG_FS | |
413 | /* | |
414 | * Some debugfs entries only exposed if we're using debug | |
415 | */ | |
416 | static int ab3100_registers_print(struct seq_file *s, void *p) | |
417 | { | |
418 | struct ab3100 *ab3100 = s->private; | |
419 | u8 value; | |
420 | u8 reg; | |
421 | ||
422 | seq_printf(s, "AB3100 registers:\n"); | |
423 | ||
424 | for (reg = 0; reg < 0xff; reg++) { | |
956f25a6 | 425 | ab3100_get_register_interruptible(ab3100, reg, &value); |
14fa5691 LW |
426 | seq_printf(s, "[0x%x]: 0x%x\n", reg, value); |
427 | } | |
428 | return 0; | |
429 | } | |
430 | ||
431 | static int ab3100_registers_open(struct inode *inode, struct file *file) | |
432 | { | |
433 | return single_open(file, ab3100_registers_print, inode->i_private); | |
434 | } | |
435 | ||
436 | static const struct file_operations ab3100_registers_fops = { | |
437 | .open = ab3100_registers_open, | |
438 | .read = seq_read, | |
439 | .llseek = seq_lseek, | |
440 | .release = single_release, | |
441 | .owner = THIS_MODULE, | |
442 | }; | |
443 | ||
444 | struct ab3100_get_set_reg_priv { | |
445 | struct ab3100 *ab3100; | |
446 | bool mode; | |
447 | }; | |
448 | ||
449 | static int ab3100_get_set_reg_open_file(struct inode *inode, struct file *file) | |
450 | { | |
451 | file->private_data = inode->i_private; | |
452 | return 0; | |
453 | } | |
454 | ||
dfc3aa72 SO |
455 | static ssize_t ab3100_get_set_reg(struct file *file, |
456 | const char __user *user_buf, | |
457 | size_t count, loff_t *ppos) | |
14fa5691 LW |
458 | { |
459 | struct ab3100_get_set_reg_priv *priv = file->private_data; | |
460 | struct ab3100 *ab3100 = priv->ab3100; | |
461 | char buf[32]; | |
dfc3aa72 | 462 | ssize_t buf_size; |
14fa5691 LW |
463 | int regp; |
464 | unsigned long user_reg; | |
465 | int err; | |
466 | int i = 0; | |
467 | ||
468 | /* Get userspace string and assure termination */ | |
469 | buf_size = min(count, (sizeof(buf)-1)); | |
470 | if (copy_from_user(buf, user_buf, buf_size)) | |
471 | return -EFAULT; | |
472 | buf[buf_size] = 0; | |
473 | ||
474 | /* | |
475 | * The idea is here to parse a string which is either | |
476 | * "0xnn" for reading a register, or "0xaa 0xbb" for | |
477 | * writing 0xbb to the register 0xaa. First move past | |
478 | * whitespace and then begin to parse the register. | |
479 | */ | |
480 | while ((i < buf_size) && (buf[i] == ' ')) | |
481 | i++; | |
482 | regp = i; | |
483 | ||
484 | /* | |
485 | * Advance pointer to end of string then terminate | |
486 | * the register string. This is needed to satisfy | |
487 | * the strict_strtoul() function. | |
488 | */ | |
489 | while ((i < buf_size) && (buf[i] != ' ')) | |
490 | i++; | |
491 | buf[i] = '\0'; | |
492 | ||
493 | err = strict_strtoul(&buf[regp], 16, &user_reg); | |
494 | if (err) | |
495 | return err; | |
496 | if (user_reg > 0xff) | |
497 | return -EINVAL; | |
498 | ||
499 | /* Either we read or we write a register here */ | |
500 | if (!priv->mode) { | |
501 | /* Reading */ | |
502 | u8 reg = (u8) user_reg; | |
503 | u8 regvalue; | |
504 | ||
956f25a6 | 505 | ab3100_get_register_interruptible(ab3100, reg, ®value); |
14fa5691 LW |
506 | |
507 | dev_info(ab3100->dev, | |
508 | "debug read AB3100 reg[0x%02x]: 0x%02x\n", | |
509 | reg, regvalue); | |
510 | } else { | |
511 | int valp; | |
512 | unsigned long user_value; | |
513 | u8 reg = (u8) user_reg; | |
514 | u8 value; | |
515 | u8 regvalue; | |
516 | ||
517 | /* | |
518 | * Writing, we need some value to write to | |
519 | * the register so keep parsing the string | |
520 | * from userspace. | |
521 | */ | |
522 | i++; | |
523 | while ((i < buf_size) && (buf[i] == ' ')) | |
524 | i++; | |
525 | valp = i; | |
526 | while ((i < buf_size) && (buf[i] != ' ')) | |
527 | i++; | |
528 | buf[i] = '\0'; | |
529 | ||
530 | err = strict_strtoul(&buf[valp], 16, &user_value); | |
531 | if (err) | |
532 | return err; | |
533 | if (user_reg > 0xff) | |
534 | return -EINVAL; | |
535 | ||
536 | value = (u8) user_value; | |
956f25a6 LW |
537 | ab3100_set_register_interruptible(ab3100, reg, value); |
538 | ab3100_get_register_interruptible(ab3100, reg, ®value); | |
14fa5691 LW |
539 | |
540 | dev_info(ab3100->dev, | |
541 | "debug write reg[0x%02x] with 0x%02x, " | |
542 | "after readback: 0x%02x\n", | |
543 | reg, value, regvalue); | |
544 | } | |
545 | return buf_size; | |
546 | } | |
547 | ||
548 | static const struct file_operations ab3100_get_set_reg_fops = { | |
549 | .open = ab3100_get_set_reg_open_file, | |
550 | .write = ab3100_get_set_reg, | |
551 | }; | |
552 | ||
553 | static struct dentry *ab3100_dir; | |
554 | static struct dentry *ab3100_reg_file; | |
555 | static struct ab3100_get_set_reg_priv ab3100_get_priv; | |
556 | static struct dentry *ab3100_get_reg_file; | |
557 | static struct ab3100_get_set_reg_priv ab3100_set_priv; | |
558 | static struct dentry *ab3100_set_reg_file; | |
559 | ||
560 | static void ab3100_setup_debugfs(struct ab3100 *ab3100) | |
561 | { | |
562 | int err; | |
563 | ||
564 | ab3100_dir = debugfs_create_dir("ab3100", NULL); | |
565 | if (!ab3100_dir) | |
566 | goto exit_no_debugfs; | |
567 | ||
568 | ab3100_reg_file = debugfs_create_file("registers", | |
569 | S_IRUGO, ab3100_dir, ab3100, | |
570 | &ab3100_registers_fops); | |
571 | if (!ab3100_reg_file) { | |
572 | err = -ENOMEM; | |
573 | goto exit_destroy_dir; | |
574 | } | |
575 | ||
576 | ab3100_get_priv.ab3100 = ab3100; | |
577 | ab3100_get_priv.mode = false; | |
578 | ab3100_get_reg_file = debugfs_create_file("get_reg", | |
579 | S_IWUGO, ab3100_dir, &ab3100_get_priv, | |
580 | &ab3100_get_set_reg_fops); | |
581 | if (!ab3100_get_reg_file) { | |
582 | err = -ENOMEM; | |
583 | goto exit_destroy_reg; | |
584 | } | |
585 | ||
586 | ab3100_set_priv.ab3100 = ab3100; | |
587 | ab3100_set_priv.mode = true; | |
588 | ab3100_set_reg_file = debugfs_create_file("set_reg", | |
589 | S_IWUGO, ab3100_dir, &ab3100_set_priv, | |
590 | &ab3100_get_set_reg_fops); | |
591 | if (!ab3100_set_reg_file) { | |
592 | err = -ENOMEM; | |
593 | goto exit_destroy_get_reg; | |
594 | } | |
595 | return; | |
596 | ||
597 | exit_destroy_get_reg: | |
598 | debugfs_remove(ab3100_get_reg_file); | |
599 | exit_destroy_reg: | |
600 | debugfs_remove(ab3100_reg_file); | |
601 | exit_destroy_dir: | |
602 | debugfs_remove(ab3100_dir); | |
603 | exit_no_debugfs: | |
604 | return; | |
605 | } | |
606 | static inline void ab3100_remove_debugfs(void) | |
607 | { | |
608 | debugfs_remove(ab3100_set_reg_file); | |
609 | debugfs_remove(ab3100_get_reg_file); | |
610 | debugfs_remove(ab3100_reg_file); | |
611 | debugfs_remove(ab3100_dir); | |
612 | } | |
613 | #else | |
614 | static inline void ab3100_setup_debugfs(struct ab3100 *ab3100) | |
615 | { | |
616 | } | |
617 | static inline void ab3100_remove_debugfs(void) | |
618 | { | |
619 | } | |
620 | #endif | |
621 | ||
622 | /* | |
623 | * Basic set-up, datastructure creation/destruction and I2C interface. | |
624 | * This sets up a default config in the AB3100 chip so that it | |
625 | * will work as expected. | |
626 | */ | |
627 | ||
628 | struct ab3100_init_setting { | |
629 | u8 abreg; | |
630 | u8 setting; | |
631 | }; | |
632 | ||
00d3803b | 633 | static const struct ab3100_init_setting __initconst |
14fa5691 LW |
634 | ab3100_init_settings[] = { |
635 | { | |
636 | .abreg = AB3100_MCA, | |
637 | .setting = 0x01 | |
638 | }, { | |
639 | .abreg = AB3100_MCB, | |
640 | .setting = 0x30 | |
641 | }, { | |
642 | .abreg = AB3100_IMRA1, | |
643 | .setting = 0x00 | |
644 | }, { | |
645 | .abreg = AB3100_IMRA2, | |
646 | .setting = 0xFF | |
647 | }, { | |
648 | .abreg = AB3100_IMRA3, | |
649 | .setting = 0x01 | |
650 | }, { | |
651 | .abreg = AB3100_IMRB1, | |
ce290b0e | 652 | .setting = 0xBF |
14fa5691 LW |
653 | }, { |
654 | .abreg = AB3100_IMRB2, | |
655 | .setting = 0xFF | |
656 | }, { | |
657 | .abreg = AB3100_IMRB3, | |
658 | .setting = 0xFF | |
659 | }, { | |
660 | .abreg = AB3100_SUP, | |
661 | .setting = 0x00 | |
662 | }, { | |
663 | .abreg = AB3100_DIS, | |
664 | .setting = 0xF0 | |
665 | }, { | |
666 | .abreg = AB3100_D0C, | |
667 | .setting = 0x00 | |
668 | }, { | |
669 | .abreg = AB3100_D1C, | |
670 | .setting = 0x00 | |
671 | }, { | |
672 | .abreg = AB3100_D2C, | |
673 | .setting = 0x00 | |
674 | }, { | |
675 | .abreg = AB3100_D3C, | |
676 | .setting = 0x00 | |
677 | }, | |
678 | }; | |
679 | ||
680 | static int __init ab3100_setup(struct ab3100 *ab3100) | |
681 | { | |
682 | int err = 0; | |
683 | int i; | |
684 | ||
685 | for (i = 0; i < ARRAY_SIZE(ab3100_init_settings); i++) { | |
956f25a6 | 686 | err = ab3100_set_register_interruptible(ab3100, |
14fa5691 LW |
687 | ab3100_init_settings[i].abreg, |
688 | ab3100_init_settings[i].setting); | |
689 | if (err) | |
690 | goto exit_no_setup; | |
691 | } | |
692 | ||
693 | /* | |
694 | * Special trick to make the AB3100 use the 32kHz clock (RTC) | |
956f25a6 | 695 | * bit 3 in test register 0x02 is a special, undocumented test |
14fa5691 LW |
696 | * register bit that only exist in AB3100 P1E |
697 | */ | |
698 | if (ab3100->chip_id == 0xc4) { | |
699 | dev_warn(ab3100->dev, | |
700 | "AB3100 P1E variant detected, " | |
701 | "forcing chip to 32KHz\n"); | |
956f25a6 | 702 | err = ab3100_set_test_register_interruptible(ab3100, 0x02, 0x08); |
14fa5691 LW |
703 | } |
704 | ||
705 | exit_no_setup: | |
706 | return err; | |
707 | } | |
708 | ||
709 | /* | |
710 | * Here we define all the platform devices that appear | |
711 | * as children of the AB3100. These are regular platform | |
712 | * devices with the IORESOURCE_IO .start and .end set | |
713 | * to correspond to the internal AB3100 register range | |
714 | * mapping to the corresponding subdevice. | |
715 | */ | |
716 | ||
717 | #define AB3100_DEVICE(devname, devid) \ | |
718 | static struct platform_device ab3100_##devname##_device = { \ | |
719 | .name = devid, \ | |
720 | .id = -1, \ | |
721 | } | |
722 | ||
723 | /* | |
724 | * This lists all the subdevices and corresponding register | |
725 | * ranges. | |
726 | */ | |
727 | AB3100_DEVICE(dac, "ab3100-dac"); | |
728 | AB3100_DEVICE(leds, "ab3100-leds"); | |
729 | AB3100_DEVICE(power, "ab3100-power"); | |
730 | AB3100_DEVICE(regulators, "ab3100-regulators"); | |
731 | AB3100_DEVICE(sim, "ab3100-sim"); | |
732 | AB3100_DEVICE(uart, "ab3100-uart"); | |
733 | AB3100_DEVICE(rtc, "ab3100-rtc"); | |
734 | AB3100_DEVICE(charger, "ab3100-charger"); | |
735 | AB3100_DEVICE(boost, "ab3100-boost"); | |
736 | AB3100_DEVICE(adc, "ab3100-adc"); | |
737 | AB3100_DEVICE(fuelgauge, "ab3100-fuelgauge"); | |
738 | AB3100_DEVICE(vibrator, "ab3100-vibrator"); | |
739 | AB3100_DEVICE(otp, "ab3100-otp"); | |
740 | AB3100_DEVICE(codec, "ab3100-codec"); | |
741 | ||
742 | static struct platform_device * | |
743 | ab3100_platform_devs[] = { | |
744 | &ab3100_dac_device, | |
745 | &ab3100_leds_device, | |
746 | &ab3100_power_device, | |
747 | &ab3100_regulators_device, | |
748 | &ab3100_sim_device, | |
749 | &ab3100_uart_device, | |
750 | &ab3100_rtc_device, | |
751 | &ab3100_charger_device, | |
752 | &ab3100_boost_device, | |
753 | &ab3100_adc_device, | |
754 | &ab3100_fuelgauge_device, | |
755 | &ab3100_vibrator_device, | |
756 | &ab3100_otp_device, | |
757 | &ab3100_codec_device, | |
758 | }; | |
759 | ||
760 | struct ab_family_id { | |
761 | u8 id; | |
762 | char *name; | |
763 | }; | |
764 | ||
765 | static const struct ab_family_id ids[] __initdata = { | |
766 | /* AB3100 */ | |
767 | { | |
768 | .id = 0xc0, | |
769 | .name = "P1A" | |
770 | }, { | |
771 | .id = 0xc1, | |
772 | .name = "P1B" | |
773 | }, { | |
774 | .id = 0xc2, | |
775 | .name = "P1C" | |
776 | }, { | |
777 | .id = 0xc3, | |
778 | .name = "P1D" | |
779 | }, { | |
780 | .id = 0xc4, | |
781 | .name = "P1E" | |
782 | }, { | |
783 | .id = 0xc5, | |
784 | .name = "P1F/R1A" | |
785 | }, { | |
786 | .id = 0xc6, | |
787 | .name = "P1G/R1A" | |
788 | }, { | |
789 | .id = 0xc7, | |
790 | .name = "P2A/R2A" | |
791 | }, { | |
792 | .id = 0xc8, | |
793 | .name = "P2B/R2B" | |
794 | }, | |
795 | /* AB3000 variants, not supported */ | |
796 | { | |
797 | .id = 0xa0 | |
798 | }, { | |
799 | .id = 0xa1 | |
800 | }, { | |
801 | .id = 0xa2 | |
802 | }, { | |
803 | .id = 0xa3 | |
804 | }, { | |
805 | .id = 0xa4 | |
806 | }, { | |
807 | .id = 0xa5 | |
808 | }, { | |
809 | .id = 0xa6 | |
810 | }, { | |
811 | .id = 0xa7 | |
812 | }, | |
813 | /* Terminator */ | |
814 | { | |
815 | .id = 0x00, | |
816 | }, | |
817 | }; | |
818 | ||
819 | static int __init ab3100_probe(struct i2c_client *client, | |
820 | const struct i2c_device_id *id) | |
821 | { | |
822 | struct ab3100 *ab3100; | |
d619bc14 LW |
823 | struct ab3100_platform_data *ab3100_plf_data = |
824 | client->dev.platform_data; | |
14fa5691 LW |
825 | int err; |
826 | int i; | |
827 | ||
828 | ab3100 = kzalloc(sizeof(struct ab3100), GFP_KERNEL); | |
829 | if (!ab3100) { | |
830 | dev_err(&client->dev, "could not allocate AB3100 device\n"); | |
831 | return -ENOMEM; | |
832 | } | |
833 | ||
834 | /* Initialize data structure */ | |
835 | mutex_init(&ab3100->access_mutex); | |
836 | BLOCKING_INIT_NOTIFIER_HEAD(&ab3100->event_subscribers); | |
837 | ||
838 | ab3100->i2c_client = client; | |
839 | ab3100->dev = &ab3100->i2c_client->dev; | |
840 | ||
841 | i2c_set_clientdata(client, ab3100); | |
842 | ||
843 | /* Read chip ID register */ | |
956f25a6 LW |
844 | err = ab3100_get_register_interruptible(ab3100, AB3100_CID, |
845 | &ab3100->chip_id); | |
14fa5691 LW |
846 | if (err) { |
847 | dev_err(&client->dev, | |
848 | "could not communicate with the AB3100 analog " | |
849 | "baseband chip\n"); | |
850 | goto exit_no_detect; | |
851 | } | |
852 | ||
853 | for (i = 0; ids[i].id != 0x0; i++) { | |
854 | if (ids[i].id == ab3100->chip_id) { | |
855 | if (ids[i].name != NULL) { | |
856 | snprintf(&ab3100->chip_name[0], | |
857 | sizeof(ab3100->chip_name) - 1, | |
858 | "AB3100 %s", | |
859 | ids[i].name); | |
860 | break; | |
861 | } else { | |
862 | dev_err(&client->dev, | |
863 | "AB3000 is not supported\n"); | |
864 | goto exit_no_detect; | |
865 | } | |
866 | } | |
867 | } | |
868 | ||
869 | if (ids[i].id == 0x0) { | |
870 | dev_err(&client->dev, "unknown analog baseband chip id: 0x%x\n", | |
871 | ab3100->chip_id); | |
872 | dev_err(&client->dev, "accepting it anyway. Please update " | |
873 | "the driver.\n"); | |
874 | goto exit_no_detect; | |
875 | } | |
876 | ||
877 | dev_info(&client->dev, "Detected chip: %s\n", | |
878 | &ab3100->chip_name[0]); | |
879 | ||
880 | /* Attach a second dummy i2c_client to the test register address */ | |
881 | ab3100->testreg_client = i2c_new_dummy(client->adapter, | |
882 | client->addr + 1); | |
883 | if (!ab3100->testreg_client) { | |
884 | err = -ENOMEM; | |
885 | goto exit_no_testreg_client; | |
886 | } | |
887 | ||
14fa5691 LW |
888 | err = ab3100_setup(ab3100); |
889 | if (err) | |
890 | goto exit_no_setup; | |
891 | ||
14fa5691 | 892 | /* This real unpredictable IRQ is of course sampled for entropy */ |
0df883df LW |
893 | err = request_threaded_irq(client->irq, NULL, ab3100_irq_handler, |
894 | IRQF_ONESHOT, | |
895 | "ab3100-core", ab3100); | |
14fa5691 LW |
896 | if (err) |
897 | goto exit_no_irq; | |
898 | ||
899 | /* Set parent and a pointer back to the container in device data */ | |
900 | for (i = 0; i < ARRAY_SIZE(ab3100_platform_devs); i++) { | |
901 | ab3100_platform_devs[i]->dev.parent = | |
902 | &client->dev; | |
d619bc14 LW |
903 | ab3100_platform_devs[i]->dev.platform_data = |
904 | ab3100_plf_data; | |
14fa5691 LW |
905 | platform_set_drvdata(ab3100_platform_devs[i], ab3100); |
906 | } | |
907 | ||
908 | /* Register the platform devices */ | |
909 | platform_add_devices(ab3100_platform_devs, | |
910 | ARRAY_SIZE(ab3100_platform_devs)); | |
911 | ||
912 | ab3100_setup_debugfs(ab3100); | |
913 | ||
914 | return 0; | |
915 | ||
916 | exit_no_irq: | |
917 | exit_no_setup: | |
918 | i2c_unregister_device(ab3100->testreg_client); | |
919 | exit_no_testreg_client: | |
920 | exit_no_detect: | |
921 | kfree(ab3100); | |
922 | return err; | |
923 | } | |
924 | ||
925 | static int __exit ab3100_remove(struct i2c_client *client) | |
926 | { | |
927 | struct ab3100 *ab3100 = i2c_get_clientdata(client); | |
928 | int i; | |
929 | ||
930 | /* Unregister subdevices */ | |
931 | for (i = 0; i < ARRAY_SIZE(ab3100_platform_devs); i++) | |
932 | platform_device_unregister(ab3100_platform_devs[i]); | |
933 | ||
934 | ab3100_remove_debugfs(); | |
935 | i2c_unregister_device(ab3100->testreg_client); | |
936 | ||
937 | /* | |
938 | * At this point, all subscribers should have unregistered | |
939 | * their notifiers so deactivate IRQ | |
940 | */ | |
941 | free_irq(client->irq, ab3100); | |
942 | kfree(ab3100); | |
943 | return 0; | |
944 | } | |
945 | ||
946 | static const struct i2c_device_id ab3100_id[] = { | |
dcffa125 | 947 | { "ab3100", 0 }, |
14fa5691 LW |
948 | { } |
949 | }; | |
950 | MODULE_DEVICE_TABLE(i2c, ab3100_id); | |
951 | ||
952 | static struct i2c_driver ab3100_driver = { | |
953 | .driver = { | |
954 | .name = "ab3100", | |
955 | .owner = THIS_MODULE, | |
956 | }, | |
957 | .id_table = ab3100_id, | |
958 | .probe = ab3100_probe, | |
959 | .remove = __exit_p(ab3100_remove), | |
960 | }; | |
961 | ||
962 | static int __init ab3100_i2c_init(void) | |
963 | { | |
964 | return i2c_add_driver(&ab3100_driver); | |
965 | } | |
966 | ||
967 | static void __exit ab3100_i2c_exit(void) | |
968 | { | |
969 | i2c_del_driver(&ab3100_driver); | |
970 | } | |
971 | ||
972 | subsys_initcall(ab3100_i2c_init); | |
973 | module_exit(ab3100_i2c_exit); | |
974 | ||
975 | MODULE_AUTHOR("Linus Walleij <linus.walleij@stericsson.com>"); | |
976 | MODULE_DESCRIPTION("AB3100 core driver"); | |
977 | MODULE_LICENSE("GPL"); |