Commit | Line | Data |
---|---|---|
14fa5691 | 1 | /* |
2071db48 | 2 | * Copyright (C) 2007-2010 ST-Ericsson |
14fa5691 LW |
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> | |
5a0e3ad6 | 13 | #include <linux/slab.h> |
14fa5691 LW |
14 | #include <linux/err.h> |
15 | #include <linux/platform_device.h> | |
16 | #include <linux/device.h> | |
17 | #include <linux/interrupt.h> | |
2071db48 | 18 | #include <linux/random.h> |
14fa5691 LW |
19 | #include <linux/debugfs.h> |
20 | #include <linux/seq_file.h> | |
21 | #include <linux/uaccess.h> | |
812f9e9d | 22 | #include <linux/mfd/abx500.h> |
14fa5691 LW |
23 | |
24 | /* These are the only registers inside AB3100 used in this main file */ | |
25 | ||
26 | /* Interrupt event registers */ | |
27 | #define AB3100_EVENTA1 0x21 | |
28 | #define AB3100_EVENTA2 0x22 | |
29 | #define AB3100_EVENTA3 0x23 | |
30 | ||
31 | /* AB3100 DAC converter registers */ | |
32 | #define AB3100_DIS 0x00 | |
33 | #define AB3100_D0C 0x01 | |
34 | #define AB3100_D1C 0x02 | |
35 | #define AB3100_D2C 0x03 | |
36 | #define AB3100_D3C 0x04 | |
37 | ||
38 | /* Chip ID register */ | |
39 | #define AB3100_CID 0x20 | |
40 | ||
41 | /* AB3100 interrupt registers */ | |
42 | #define AB3100_IMRA1 0x24 | |
43 | #define AB3100_IMRA2 0x25 | |
44 | #define AB3100_IMRA3 0x26 | |
45 | #define AB3100_IMRB1 0x2B | |
46 | #define AB3100_IMRB2 0x2C | |
47 | #define AB3100_IMRB3 0x2D | |
48 | ||
49 | /* System Power Monitoring and control registers */ | |
50 | #define AB3100_MCA 0x2E | |
51 | #define AB3100_MCB 0x2F | |
52 | ||
53 | /* SIM power up */ | |
54 | #define AB3100_SUP 0x50 | |
55 | ||
56 | /* | |
57 | * I2C communication | |
58 | * | |
59 | * The AB3100 is usually assigned address 0x48 (7-bit) | |
60 | * The chip is defined in the platform i2c_board_data section. | |
61 | */ | |
fa661258 | 62 | static int ab3100_get_chip_id(struct device *dev) |
14fa5691 | 63 | { |
fa661258 MW |
64 | struct ab3100 *ab3100 = dev_get_drvdata(dev->parent); |
65 | ||
66 | return (int)ab3100->chip_id; | |
14fa5691 | 67 | } |
14fa5691 | 68 | |
fa661258 MW |
69 | static int ab3100_set_register_interruptible(struct ab3100 *ab3100, |
70 | u8 reg, u8 regval) | |
14fa5691 LW |
71 | { |
72 | u8 regandval[2] = {reg, regval}; | |
73 | int err; | |
74 | ||
75 | err = mutex_lock_interruptible(&ab3100->access_mutex); | |
76 | if (err) | |
77 | return err; | |
78 | ||
79 | /* | |
80 | * A two-byte write message with the first byte containing the register | |
81 | * number and the second byte containing the value to be written | |
82 | * effectively sets a register in the AB3100. | |
83 | */ | |
84 | err = i2c_master_send(ab3100->i2c_client, regandval, 2); | |
85 | if (err < 0) { | |
86 | dev_err(ab3100->dev, | |
87 | "write error (write register): %d\n", | |
88 | err); | |
89 | } else if (err != 2) { | |
90 | dev_err(ab3100->dev, | |
91 | "write error (write register) " | |
92 | "%d bytes transferred (expected 2)\n", | |
93 | err); | |
94 | err = -EIO; | |
95 | } else { | |
96 | /* All is well */ | |
97 | err = 0; | |
98 | } | |
99 | mutex_unlock(&ab3100->access_mutex); | |
7cdc2b98 | 100 | return err; |
14fa5691 | 101 | } |
956f25a6 | 102 | |
fa661258 MW |
103 | static int set_register_interruptible(struct device *dev, |
104 | u8 bank, u8 reg, u8 value) | |
105 | { | |
106 | struct ab3100 *ab3100 = dev_get_drvdata(dev->parent); | |
107 | ||
108 | return ab3100_set_register_interruptible(ab3100, reg, value); | |
109 | } | |
14fa5691 LW |
110 | |
111 | /* | |
112 | * The test registers exist at an I2C bus address up one | |
113 | * from the ordinary base. They are not supposed to be used | |
114 | * in production code, but sometimes you have to do that | |
115 | * anyway. It's currently only used from this file so declare | |
116 | * it static and do not export. | |
117 | */ | |
956f25a6 | 118 | static int ab3100_set_test_register_interruptible(struct ab3100 *ab3100, |
14fa5691 LW |
119 | u8 reg, u8 regval) |
120 | { | |
121 | u8 regandval[2] = {reg, regval}; | |
122 | int err; | |
123 | ||
124 | err = mutex_lock_interruptible(&ab3100->access_mutex); | |
125 | if (err) | |
126 | return err; | |
127 | ||
128 | err = i2c_master_send(ab3100->testreg_client, regandval, 2); | |
129 | if (err < 0) { | |
130 | dev_err(ab3100->dev, | |
131 | "write error (write test register): %d\n", | |
132 | err); | |
133 | } else if (err != 2) { | |
134 | dev_err(ab3100->dev, | |
135 | "write error (write test register) " | |
136 | "%d bytes transferred (expected 2)\n", | |
137 | err); | |
138 | err = -EIO; | |
139 | } else { | |
140 | /* All is well */ | |
141 | err = 0; | |
142 | } | |
143 | mutex_unlock(&ab3100->access_mutex); | |
144 | ||
145 | return err; | |
146 | } | |
147 | ||
fa661258 MW |
148 | static int ab3100_get_register_interruptible(struct ab3100 *ab3100, |
149 | u8 reg, u8 *regval) | |
14fa5691 LW |
150 | { |
151 | int err; | |
152 | ||
153 | err = mutex_lock_interruptible(&ab3100->access_mutex); | |
154 | if (err) | |
155 | return err; | |
156 | ||
157 | /* | |
158 | * AB3100 require an I2C "stop" command between each message, else | |
159 | * it will not work. The only way of achieveing this with the | |
160 | * message transport layer is to send the read and write messages | |
161 | * separately. | |
162 | */ | |
163 | err = i2c_master_send(ab3100->i2c_client, ®, 1); | |
164 | if (err < 0) { | |
165 | dev_err(ab3100->dev, | |
166 | "write error (send register address): %d\n", | |
167 | err); | |
168 | goto get_reg_out_unlock; | |
169 | } else if (err != 1) { | |
170 | dev_err(ab3100->dev, | |
171 | "write error (send register address) " | |
172 | "%d bytes transferred (expected 1)\n", | |
173 | err); | |
174 | err = -EIO; | |
175 | goto get_reg_out_unlock; | |
176 | } else { | |
177 | /* All is well */ | |
178 | err = 0; | |
179 | } | |
180 | ||
181 | err = i2c_master_recv(ab3100->i2c_client, regval, 1); | |
182 | if (err < 0) { | |
183 | dev_err(ab3100->dev, | |
184 | "write error (read register): %d\n", | |
185 | err); | |
186 | goto get_reg_out_unlock; | |
187 | } else if (err != 1) { | |
188 | dev_err(ab3100->dev, | |
189 | "write error (read register) " | |
190 | "%d bytes transferred (expected 1)\n", | |
191 | err); | |
192 | err = -EIO; | |
193 | goto get_reg_out_unlock; | |
194 | } else { | |
195 | /* All is well */ | |
196 | err = 0; | |
197 | } | |
198 | ||
199 | get_reg_out_unlock: | |
200 | mutex_unlock(&ab3100->access_mutex); | |
201 | return err; | |
202 | } | |
956f25a6 | 203 | |
fa661258 MW |
204 | static int get_register_interruptible(struct device *dev, u8 bank, u8 reg, |
205 | u8 *value) | |
206 | { | |
207 | struct ab3100 *ab3100 = dev_get_drvdata(dev->parent); | |
208 | ||
209 | return ab3100_get_register_interruptible(ab3100, reg, value); | |
210 | } | |
14fa5691 | 211 | |
fa661258 | 212 | static int ab3100_get_register_page_interruptible(struct ab3100 *ab3100, |
14fa5691 LW |
213 | u8 first_reg, u8 *regvals, u8 numregs) |
214 | { | |
215 | int err; | |
216 | ||
217 | if (ab3100->chip_id == 0xa0 || | |
218 | ab3100->chip_id == 0xa1) | |
219 | /* These don't support paged reads */ | |
220 | return -EIO; | |
221 | ||
222 | err = mutex_lock_interruptible(&ab3100->access_mutex); | |
223 | if (err) | |
224 | return err; | |
225 | ||
226 | /* | |
227 | * Paged read also require an I2C "stop" command. | |
228 | */ | |
229 | err = i2c_master_send(ab3100->i2c_client, &first_reg, 1); | |
230 | if (err < 0) { | |
231 | dev_err(ab3100->dev, | |
232 | "write error (send first register address): %d\n", | |
233 | err); | |
234 | goto get_reg_page_out_unlock; | |
235 | } else if (err != 1) { | |
236 | dev_err(ab3100->dev, | |
237 | "write error (send first register address) " | |
238 | "%d bytes transferred (expected 1)\n", | |
239 | err); | |
240 | err = -EIO; | |
241 | goto get_reg_page_out_unlock; | |
242 | } | |
243 | ||
244 | err = i2c_master_recv(ab3100->i2c_client, regvals, numregs); | |
245 | if (err < 0) { | |
246 | dev_err(ab3100->dev, | |
247 | "write error (read register page): %d\n", | |
248 | err); | |
249 | goto get_reg_page_out_unlock; | |
250 | } else if (err != numregs) { | |
251 | dev_err(ab3100->dev, | |
252 | "write error (read register page) " | |
253 | "%d bytes transferred (expected %d)\n", | |
254 | err, numregs); | |
255 | err = -EIO; | |
256 | goto get_reg_page_out_unlock; | |
257 | } | |
258 | ||
259 | /* All is well */ | |
260 | err = 0; | |
261 | ||
262 | get_reg_page_out_unlock: | |
263 | mutex_unlock(&ab3100->access_mutex); | |
264 | return err; | |
265 | } | |
14fa5691 | 266 | |
fa661258 MW |
267 | static int get_register_page_interruptible(struct device *dev, u8 bank, |
268 | u8 first_reg, u8 *regvals, u8 numregs) | |
269 | { | |
270 | struct ab3100 *ab3100 = dev_get_drvdata(dev->parent); | |
271 | ||
272 | return ab3100_get_register_page_interruptible(ab3100, | |
273 | first_reg, regvals, numregs); | |
274 | } | |
956f25a6 | 275 | |
fa661258 | 276 | static int ab3100_mask_and_set_register_interruptible(struct ab3100 *ab3100, |
14fa5691 LW |
277 | u8 reg, u8 andmask, u8 ormask) |
278 | { | |
279 | u8 regandval[2] = {reg, 0}; | |
280 | int err; | |
281 | ||
282 | err = mutex_lock_interruptible(&ab3100->access_mutex); | |
283 | if (err) | |
284 | return err; | |
285 | ||
286 | /* First read out the target register */ | |
287 | err = i2c_master_send(ab3100->i2c_client, ®, 1); | |
288 | if (err < 0) { | |
289 | dev_err(ab3100->dev, | |
290 | "write error (maskset send address): %d\n", | |
291 | err); | |
292 | goto get_maskset_unlock; | |
293 | } else if (err != 1) { | |
294 | dev_err(ab3100->dev, | |
295 | "write error (maskset send address) " | |
296 | "%d bytes transferred (expected 1)\n", | |
297 | err); | |
298 | err = -EIO; | |
299 | goto get_maskset_unlock; | |
300 | } | |
301 | ||
302 | err = i2c_master_recv(ab3100->i2c_client, ®andval[1], 1); | |
303 | if (err < 0) { | |
304 | dev_err(ab3100->dev, | |
305 | "write error (maskset read register): %d\n", | |
306 | err); | |
307 | goto get_maskset_unlock; | |
308 | } else if (err != 1) { | |
309 | dev_err(ab3100->dev, | |
310 | "write error (maskset read register) " | |
311 | "%d bytes transferred (expected 1)\n", | |
312 | err); | |
313 | err = -EIO; | |
314 | goto get_maskset_unlock; | |
315 | } | |
316 | ||
317 | /* Modify the register */ | |
318 | regandval[1] &= andmask; | |
319 | regandval[1] |= ormask; | |
320 | ||
321 | /* Write the register */ | |
322 | err = i2c_master_send(ab3100->i2c_client, regandval, 2); | |
323 | if (err < 0) { | |
324 | dev_err(ab3100->dev, | |
325 | "write error (write register): %d\n", | |
326 | err); | |
327 | goto get_maskset_unlock; | |
328 | } else if (err != 2) { | |
329 | dev_err(ab3100->dev, | |
330 | "write error (write register) " | |
331 | "%d bytes transferred (expected 2)\n", | |
332 | err); | |
333 | err = -EIO; | |
334 | goto get_maskset_unlock; | |
335 | } | |
336 | ||
337 | /* All is well */ | |
338 | err = 0; | |
339 | ||
340 | get_maskset_unlock: | |
341 | mutex_unlock(&ab3100->access_mutex); | |
342 | return err; | |
343 | } | |
956f25a6 | 344 | |
fa661258 MW |
345 | static int mask_and_set_register_interruptible(struct device *dev, u8 bank, |
346 | u8 reg, u8 bitmask, u8 bitvalues) | |
347 | { | |
348 | struct ab3100 *ab3100 = dev_get_drvdata(dev->parent); | |
349 | ||
350 | return ab3100_mask_and_set_register_interruptible(ab3100, | |
351 | reg, bitmask, (bitmask & bitvalues)); | |
352 | } | |
14fa5691 LW |
353 | |
354 | /* | |
355 | * Register a simple callback for handling any AB3100 events. | |
356 | */ | |
357 | int ab3100_event_register(struct ab3100 *ab3100, | |
358 | struct notifier_block *nb) | |
359 | { | |
360 | return blocking_notifier_chain_register(&ab3100->event_subscribers, | |
361 | nb); | |
362 | } | |
363 | EXPORT_SYMBOL(ab3100_event_register); | |
364 | ||
365 | /* | |
366 | * Remove a previously registered callback. | |
367 | */ | |
368 | int ab3100_event_unregister(struct ab3100 *ab3100, | |
369 | struct notifier_block *nb) | |
370 | { | |
371 | return blocking_notifier_chain_unregister(&ab3100->event_subscribers, | |
372 | nb); | |
373 | } | |
374 | EXPORT_SYMBOL(ab3100_event_unregister); | |
375 | ||
376 | ||
fa661258 MW |
377 | static int ab3100_event_registers_startup_state_get(struct device *dev, |
378 | u8 *event) | |
14fa5691 | 379 | { |
fa661258 | 380 | struct ab3100 *ab3100 = dev_get_drvdata(dev->parent); |
14fa5691 LW |
381 | if (!ab3100->startup_events_read) |
382 | return -EAGAIN; /* Try again later */ | |
fa661258 | 383 | memcpy(event, ab3100->startup_events, 3); |
14fa5691 LW |
384 | return 0; |
385 | } | |
fa661258 MW |
386 | |
387 | static struct abx500_ops ab3100_ops = { | |
388 | .get_chip_id = ab3100_get_chip_id, | |
389 | .set_register = set_register_interruptible, | |
390 | .get_register = get_register_interruptible, | |
391 | .get_register_page = get_register_page_interruptible, | |
392 | .set_register_page = NULL, | |
393 | .mask_and_set_register = mask_and_set_register_interruptible, | |
394 | .event_registers_startup_state_get = | |
395 | ab3100_event_registers_startup_state_get, | |
396 | .startup_irq_enabled = NULL, | |
397 | }; | |
14fa5691 | 398 | |
0df883df LW |
399 | /* |
400 | * This is a threaded interrupt handler so we can make some | |
401 | * I2C calls etc. | |
402 | */ | |
403 | static irqreturn_t ab3100_irq_handler(int irq, void *data) | |
14fa5691 | 404 | { |
0df883df | 405 | struct ab3100 *ab3100 = data; |
14fa5691 LW |
406 | u8 event_regs[3]; |
407 | u32 fatevent; | |
408 | int err; | |
409 | ||
2071db48 LW |
410 | add_interrupt_randomness(irq); |
411 | ||
956f25a6 | 412 | err = ab3100_get_register_page_interruptible(ab3100, AB3100_EVENTA1, |
14fa5691 LW |
413 | event_regs, 3); |
414 | if (err) | |
0df883df | 415 | goto err_event; |
14fa5691 LW |
416 | |
417 | fatevent = (event_regs[0] << 16) | | |
418 | (event_regs[1] << 8) | | |
419 | event_regs[2]; | |
420 | ||
421 | if (!ab3100->startup_events_read) { | |
fa661258 MW |
422 | ab3100->startup_events[0] = event_regs[0]; |
423 | ab3100->startup_events[1] = event_regs[1]; | |
424 | ab3100->startup_events[2] = event_regs[2]; | |
14fa5691 LW |
425 | ab3100->startup_events_read = true; |
426 | } | |
427 | /* | |
428 | * The notified parties will have to mask out the events | |
429 | * they're interested in and react to them. They will be | |
430 | * notified on all events, then they use the fatevent value | |
431 | * to determine if they're interested. | |
432 | */ | |
433 | blocking_notifier_call_chain(&ab3100->event_subscribers, | |
434 | fatevent, NULL); | |
435 | ||
436 | dev_dbg(ab3100->dev, | |
437 | "IRQ Event: 0x%08x\n", fatevent); | |
438 | ||
0df883df | 439 | return IRQ_HANDLED; |
14fa5691 | 440 | |
0df883df | 441 | err_event: |
14fa5691 | 442 | dev_dbg(ab3100->dev, |
0df883df | 443 | "error reading event status\n"); |
14fa5691 LW |
444 | return IRQ_HANDLED; |
445 | } | |
446 | ||
447 | #ifdef CONFIG_DEBUG_FS | |
448 | /* | |
449 | * Some debugfs entries only exposed if we're using debug | |
450 | */ | |
451 | static int ab3100_registers_print(struct seq_file *s, void *p) | |
452 | { | |
453 | struct ab3100 *ab3100 = s->private; | |
454 | u8 value; | |
455 | u8 reg; | |
456 | ||
457 | seq_printf(s, "AB3100 registers:\n"); | |
458 | ||
459 | for (reg = 0; reg < 0xff; reg++) { | |
956f25a6 | 460 | ab3100_get_register_interruptible(ab3100, reg, &value); |
14fa5691 LW |
461 | seq_printf(s, "[0x%x]: 0x%x\n", reg, value); |
462 | } | |
463 | return 0; | |
464 | } | |
465 | ||
466 | static int ab3100_registers_open(struct inode *inode, struct file *file) | |
467 | { | |
468 | return single_open(file, ab3100_registers_print, inode->i_private); | |
469 | } | |
470 | ||
471 | static const struct file_operations ab3100_registers_fops = { | |
472 | .open = ab3100_registers_open, | |
473 | .read = seq_read, | |
474 | .llseek = seq_lseek, | |
475 | .release = single_release, | |
476 | .owner = THIS_MODULE, | |
477 | }; | |
478 | ||
479 | struct ab3100_get_set_reg_priv { | |
480 | struct ab3100 *ab3100; | |
481 | bool mode; | |
482 | }; | |
483 | ||
484 | static int ab3100_get_set_reg_open_file(struct inode *inode, struct file *file) | |
485 | { | |
486 | file->private_data = inode->i_private; | |
487 | return 0; | |
488 | } | |
489 | ||
dfc3aa72 SO |
490 | static ssize_t ab3100_get_set_reg(struct file *file, |
491 | const char __user *user_buf, | |
492 | size_t count, loff_t *ppos) | |
14fa5691 LW |
493 | { |
494 | struct ab3100_get_set_reg_priv *priv = file->private_data; | |
495 | struct ab3100 *ab3100 = priv->ab3100; | |
496 | char buf[32]; | |
dfc3aa72 | 497 | ssize_t buf_size; |
14fa5691 LW |
498 | int regp; |
499 | unsigned long user_reg; | |
500 | int err; | |
501 | int i = 0; | |
502 | ||
503 | /* Get userspace string and assure termination */ | |
504 | buf_size = min(count, (sizeof(buf)-1)); | |
505 | if (copy_from_user(buf, user_buf, buf_size)) | |
506 | return -EFAULT; | |
507 | buf[buf_size] = 0; | |
508 | ||
509 | /* | |
510 | * The idea is here to parse a string which is either | |
511 | * "0xnn" for reading a register, or "0xaa 0xbb" for | |
512 | * writing 0xbb to the register 0xaa. First move past | |
513 | * whitespace and then begin to parse the register. | |
514 | */ | |
515 | while ((i < buf_size) && (buf[i] == ' ')) | |
516 | i++; | |
517 | regp = i; | |
518 | ||
519 | /* | |
520 | * Advance pointer to end of string then terminate | |
521 | * the register string. This is needed to satisfy | |
522 | * the strict_strtoul() function. | |
523 | */ | |
524 | while ((i < buf_size) && (buf[i] != ' ')) | |
525 | i++; | |
526 | buf[i] = '\0'; | |
527 | ||
528 | err = strict_strtoul(&buf[regp], 16, &user_reg); | |
529 | if (err) | |
530 | return err; | |
531 | if (user_reg > 0xff) | |
532 | return -EINVAL; | |
533 | ||
534 | /* Either we read or we write a register here */ | |
535 | if (!priv->mode) { | |
536 | /* Reading */ | |
537 | u8 reg = (u8) user_reg; | |
538 | u8 regvalue; | |
539 | ||
956f25a6 | 540 | ab3100_get_register_interruptible(ab3100, reg, ®value); |
14fa5691 LW |
541 | |
542 | dev_info(ab3100->dev, | |
543 | "debug read AB3100 reg[0x%02x]: 0x%02x\n", | |
544 | reg, regvalue); | |
545 | } else { | |
546 | int valp; | |
547 | unsigned long user_value; | |
548 | u8 reg = (u8) user_reg; | |
549 | u8 value; | |
550 | u8 regvalue; | |
551 | ||
552 | /* | |
553 | * Writing, we need some value to write to | |
554 | * the register so keep parsing the string | |
555 | * from userspace. | |
556 | */ | |
557 | i++; | |
558 | while ((i < buf_size) && (buf[i] == ' ')) | |
559 | i++; | |
560 | valp = i; | |
561 | while ((i < buf_size) && (buf[i] != ' ')) | |
562 | i++; | |
563 | buf[i] = '\0'; | |
564 | ||
565 | err = strict_strtoul(&buf[valp], 16, &user_value); | |
566 | if (err) | |
567 | return err; | |
568 | if (user_reg > 0xff) | |
569 | return -EINVAL; | |
570 | ||
571 | value = (u8) user_value; | |
956f25a6 LW |
572 | ab3100_set_register_interruptible(ab3100, reg, value); |
573 | ab3100_get_register_interruptible(ab3100, reg, ®value); | |
14fa5691 LW |
574 | |
575 | dev_info(ab3100->dev, | |
576 | "debug write reg[0x%02x] with 0x%02x, " | |
577 | "after readback: 0x%02x\n", | |
578 | reg, value, regvalue); | |
579 | } | |
580 | return buf_size; | |
581 | } | |
582 | ||
583 | static const struct file_operations ab3100_get_set_reg_fops = { | |
584 | .open = ab3100_get_set_reg_open_file, | |
585 | .write = ab3100_get_set_reg, | |
6038f373 | 586 | .llseek = noop_llseek, |
14fa5691 LW |
587 | }; |
588 | ||
589 | static struct dentry *ab3100_dir; | |
590 | static struct dentry *ab3100_reg_file; | |
591 | static struct ab3100_get_set_reg_priv ab3100_get_priv; | |
592 | static struct dentry *ab3100_get_reg_file; | |
593 | static struct ab3100_get_set_reg_priv ab3100_set_priv; | |
594 | static struct dentry *ab3100_set_reg_file; | |
595 | ||
596 | static void ab3100_setup_debugfs(struct ab3100 *ab3100) | |
597 | { | |
598 | int err; | |
599 | ||
600 | ab3100_dir = debugfs_create_dir("ab3100", NULL); | |
601 | if (!ab3100_dir) | |
602 | goto exit_no_debugfs; | |
603 | ||
604 | ab3100_reg_file = debugfs_create_file("registers", | |
605 | S_IRUGO, ab3100_dir, ab3100, | |
606 | &ab3100_registers_fops); | |
607 | if (!ab3100_reg_file) { | |
608 | err = -ENOMEM; | |
609 | goto exit_destroy_dir; | |
610 | } | |
611 | ||
612 | ab3100_get_priv.ab3100 = ab3100; | |
613 | ab3100_get_priv.mode = false; | |
614 | ab3100_get_reg_file = debugfs_create_file("get_reg", | |
615 | S_IWUGO, ab3100_dir, &ab3100_get_priv, | |
616 | &ab3100_get_set_reg_fops); | |
617 | if (!ab3100_get_reg_file) { | |
618 | err = -ENOMEM; | |
619 | goto exit_destroy_reg; | |
620 | } | |
621 | ||
622 | ab3100_set_priv.ab3100 = ab3100; | |
623 | ab3100_set_priv.mode = true; | |
624 | ab3100_set_reg_file = debugfs_create_file("set_reg", | |
625 | S_IWUGO, ab3100_dir, &ab3100_set_priv, | |
626 | &ab3100_get_set_reg_fops); | |
627 | if (!ab3100_set_reg_file) { | |
628 | err = -ENOMEM; | |
629 | goto exit_destroy_get_reg; | |
630 | } | |
631 | return; | |
632 | ||
633 | exit_destroy_get_reg: | |
634 | debugfs_remove(ab3100_get_reg_file); | |
635 | exit_destroy_reg: | |
636 | debugfs_remove(ab3100_reg_file); | |
637 | exit_destroy_dir: | |
638 | debugfs_remove(ab3100_dir); | |
639 | exit_no_debugfs: | |
640 | return; | |
641 | } | |
642 | static inline void ab3100_remove_debugfs(void) | |
643 | { | |
644 | debugfs_remove(ab3100_set_reg_file); | |
645 | debugfs_remove(ab3100_get_reg_file); | |
646 | debugfs_remove(ab3100_reg_file); | |
647 | debugfs_remove(ab3100_dir); | |
648 | } | |
649 | #else | |
650 | static inline void ab3100_setup_debugfs(struct ab3100 *ab3100) | |
651 | { | |
652 | } | |
653 | static inline void ab3100_remove_debugfs(void) | |
654 | { | |
655 | } | |
656 | #endif | |
657 | ||
658 | /* | |
659 | * Basic set-up, datastructure creation/destruction and I2C interface. | |
660 | * This sets up a default config in the AB3100 chip so that it | |
661 | * will work as expected. | |
662 | */ | |
663 | ||
664 | struct ab3100_init_setting { | |
665 | u8 abreg; | |
666 | u8 setting; | |
667 | }; | |
668 | ||
00d3803b | 669 | static const struct ab3100_init_setting __initconst |
14fa5691 LW |
670 | ab3100_init_settings[] = { |
671 | { | |
672 | .abreg = AB3100_MCA, | |
673 | .setting = 0x01 | |
674 | }, { | |
675 | .abreg = AB3100_MCB, | |
676 | .setting = 0x30 | |
677 | }, { | |
678 | .abreg = AB3100_IMRA1, | |
679 | .setting = 0x00 | |
680 | }, { | |
681 | .abreg = AB3100_IMRA2, | |
682 | .setting = 0xFF | |
683 | }, { | |
684 | .abreg = AB3100_IMRA3, | |
685 | .setting = 0x01 | |
686 | }, { | |
687 | .abreg = AB3100_IMRB1, | |
ce290b0e | 688 | .setting = 0xBF |
14fa5691 LW |
689 | }, { |
690 | .abreg = AB3100_IMRB2, | |
691 | .setting = 0xFF | |
692 | }, { | |
693 | .abreg = AB3100_IMRB3, | |
694 | .setting = 0xFF | |
695 | }, { | |
696 | .abreg = AB3100_SUP, | |
697 | .setting = 0x00 | |
698 | }, { | |
699 | .abreg = AB3100_DIS, | |
700 | .setting = 0xF0 | |
701 | }, { | |
702 | .abreg = AB3100_D0C, | |
703 | .setting = 0x00 | |
704 | }, { | |
705 | .abreg = AB3100_D1C, | |
706 | .setting = 0x00 | |
707 | }, { | |
708 | .abreg = AB3100_D2C, | |
709 | .setting = 0x00 | |
710 | }, { | |
711 | .abreg = AB3100_D3C, | |
712 | .setting = 0x00 | |
713 | }, | |
714 | }; | |
715 | ||
716 | static int __init ab3100_setup(struct ab3100 *ab3100) | |
717 | { | |
718 | int err = 0; | |
719 | int i; | |
720 | ||
721 | for (i = 0; i < ARRAY_SIZE(ab3100_init_settings); i++) { | |
956f25a6 | 722 | err = ab3100_set_register_interruptible(ab3100, |
14fa5691 LW |
723 | ab3100_init_settings[i].abreg, |
724 | ab3100_init_settings[i].setting); | |
725 | if (err) | |
726 | goto exit_no_setup; | |
727 | } | |
728 | ||
729 | /* | |
730 | * Special trick to make the AB3100 use the 32kHz clock (RTC) | |
956f25a6 | 731 | * bit 3 in test register 0x02 is a special, undocumented test |
14fa5691 LW |
732 | * register bit that only exist in AB3100 P1E |
733 | */ | |
734 | if (ab3100->chip_id == 0xc4) { | |
735 | dev_warn(ab3100->dev, | |
736 | "AB3100 P1E variant detected, " | |
737 | "forcing chip to 32KHz\n"); | |
fa661258 MW |
738 | err = ab3100_set_test_register_interruptible(ab3100, |
739 | 0x02, 0x08); | |
14fa5691 LW |
740 | } |
741 | ||
742 | exit_no_setup: | |
743 | return err; | |
744 | } | |
745 | ||
746 | /* | |
747 | * Here we define all the platform devices that appear | |
748 | * as children of the AB3100. These are regular platform | |
749 | * devices with the IORESOURCE_IO .start and .end set | |
750 | * to correspond to the internal AB3100 register range | |
751 | * mapping to the corresponding subdevice. | |
752 | */ | |
753 | ||
754 | #define AB3100_DEVICE(devname, devid) \ | |
755 | static struct platform_device ab3100_##devname##_device = { \ | |
756 | .name = devid, \ | |
757 | .id = -1, \ | |
758 | } | |
759 | ||
2071db48 | 760 | /* This lists all the subdevices */ |
14fa5691 LW |
761 | AB3100_DEVICE(dac, "ab3100-dac"); |
762 | AB3100_DEVICE(leds, "ab3100-leds"); | |
763 | AB3100_DEVICE(power, "ab3100-power"); | |
764 | AB3100_DEVICE(regulators, "ab3100-regulators"); | |
765 | AB3100_DEVICE(sim, "ab3100-sim"); | |
766 | AB3100_DEVICE(uart, "ab3100-uart"); | |
767 | AB3100_DEVICE(rtc, "ab3100-rtc"); | |
768 | AB3100_DEVICE(charger, "ab3100-charger"); | |
769 | AB3100_DEVICE(boost, "ab3100-boost"); | |
770 | AB3100_DEVICE(adc, "ab3100-adc"); | |
771 | AB3100_DEVICE(fuelgauge, "ab3100-fuelgauge"); | |
772 | AB3100_DEVICE(vibrator, "ab3100-vibrator"); | |
773 | AB3100_DEVICE(otp, "ab3100-otp"); | |
774 | AB3100_DEVICE(codec, "ab3100-codec"); | |
775 | ||
776 | static struct platform_device * | |
777 | ab3100_platform_devs[] = { | |
778 | &ab3100_dac_device, | |
779 | &ab3100_leds_device, | |
780 | &ab3100_power_device, | |
781 | &ab3100_regulators_device, | |
782 | &ab3100_sim_device, | |
783 | &ab3100_uart_device, | |
784 | &ab3100_rtc_device, | |
785 | &ab3100_charger_device, | |
786 | &ab3100_boost_device, | |
787 | &ab3100_adc_device, | |
788 | &ab3100_fuelgauge_device, | |
789 | &ab3100_vibrator_device, | |
790 | &ab3100_otp_device, | |
791 | &ab3100_codec_device, | |
792 | }; | |
793 | ||
794 | struct ab_family_id { | |
795 | u8 id; | |
796 | char *name; | |
797 | }; | |
798 | ||
799 | static const struct ab_family_id ids[] __initdata = { | |
800 | /* AB3100 */ | |
801 | { | |
802 | .id = 0xc0, | |
803 | .name = "P1A" | |
804 | }, { | |
805 | .id = 0xc1, | |
806 | .name = "P1B" | |
807 | }, { | |
808 | .id = 0xc2, | |
809 | .name = "P1C" | |
810 | }, { | |
811 | .id = 0xc3, | |
812 | .name = "P1D" | |
813 | }, { | |
814 | .id = 0xc4, | |
815 | .name = "P1E" | |
816 | }, { | |
817 | .id = 0xc5, | |
818 | .name = "P1F/R1A" | |
819 | }, { | |
820 | .id = 0xc6, | |
821 | .name = "P1G/R1A" | |
822 | }, { | |
823 | .id = 0xc7, | |
824 | .name = "P2A/R2A" | |
825 | }, { | |
826 | .id = 0xc8, | |
827 | .name = "P2B/R2B" | |
828 | }, | |
829 | /* AB3000 variants, not supported */ | |
830 | { | |
831 | .id = 0xa0 | |
832 | }, { | |
833 | .id = 0xa1 | |
834 | }, { | |
835 | .id = 0xa2 | |
836 | }, { | |
837 | .id = 0xa3 | |
838 | }, { | |
839 | .id = 0xa4 | |
840 | }, { | |
841 | .id = 0xa5 | |
842 | }, { | |
843 | .id = 0xa6 | |
844 | }, { | |
845 | .id = 0xa7 | |
846 | }, | |
847 | /* Terminator */ | |
848 | { | |
849 | .id = 0x00, | |
850 | }, | |
851 | }; | |
852 | ||
853 | static int __init ab3100_probe(struct i2c_client *client, | |
854 | const struct i2c_device_id *id) | |
855 | { | |
856 | struct ab3100 *ab3100; | |
d619bc14 LW |
857 | struct ab3100_platform_data *ab3100_plf_data = |
858 | client->dev.platform_data; | |
14fa5691 LW |
859 | int err; |
860 | int i; | |
861 | ||
862 | ab3100 = kzalloc(sizeof(struct ab3100), GFP_KERNEL); | |
863 | if (!ab3100) { | |
864 | dev_err(&client->dev, "could not allocate AB3100 device\n"); | |
865 | return -ENOMEM; | |
866 | } | |
867 | ||
868 | /* Initialize data structure */ | |
869 | mutex_init(&ab3100->access_mutex); | |
870 | BLOCKING_INIT_NOTIFIER_HEAD(&ab3100->event_subscribers); | |
871 | ||
872 | ab3100->i2c_client = client; | |
873 | ab3100->dev = &ab3100->i2c_client->dev; | |
874 | ||
875 | i2c_set_clientdata(client, ab3100); | |
876 | ||
877 | /* Read chip ID register */ | |
956f25a6 LW |
878 | err = ab3100_get_register_interruptible(ab3100, AB3100_CID, |
879 | &ab3100->chip_id); | |
14fa5691 LW |
880 | if (err) { |
881 | dev_err(&client->dev, | |
882 | "could not communicate with the AB3100 analog " | |
883 | "baseband chip\n"); | |
884 | goto exit_no_detect; | |
885 | } | |
886 | ||
887 | for (i = 0; ids[i].id != 0x0; i++) { | |
888 | if (ids[i].id == ab3100->chip_id) { | |
889 | if (ids[i].name != NULL) { | |
890 | snprintf(&ab3100->chip_name[0], | |
891 | sizeof(ab3100->chip_name) - 1, | |
892 | "AB3100 %s", | |
893 | ids[i].name); | |
894 | break; | |
895 | } else { | |
896 | dev_err(&client->dev, | |
897 | "AB3000 is not supported\n"); | |
898 | goto exit_no_detect; | |
899 | } | |
900 | } | |
901 | } | |
902 | ||
903 | if (ids[i].id == 0x0) { | |
904 | dev_err(&client->dev, "unknown analog baseband chip id: 0x%x\n", | |
905 | ab3100->chip_id); | |
906 | dev_err(&client->dev, "accepting it anyway. Please update " | |
907 | "the driver.\n"); | |
908 | goto exit_no_detect; | |
909 | } | |
910 | ||
911 | dev_info(&client->dev, "Detected chip: %s\n", | |
912 | &ab3100->chip_name[0]); | |
913 | ||
914 | /* Attach a second dummy i2c_client to the test register address */ | |
915 | ab3100->testreg_client = i2c_new_dummy(client->adapter, | |
916 | client->addr + 1); | |
917 | if (!ab3100->testreg_client) { | |
918 | err = -ENOMEM; | |
919 | goto exit_no_testreg_client; | |
920 | } | |
921 | ||
14fa5691 LW |
922 | err = ab3100_setup(ab3100); |
923 | if (err) | |
924 | goto exit_no_setup; | |
925 | ||
0df883df | 926 | err = request_threaded_irq(client->irq, NULL, ab3100_irq_handler, |
2071db48 LW |
927 | IRQF_ONESHOT, "ab3100-core", ab3100); |
928 | /* This real unpredictable IRQ is of course sampled for entropy */ | |
929 | rand_initialize_irq(client->irq); | |
930 | ||
14fa5691 LW |
931 | if (err) |
932 | goto exit_no_irq; | |
933 | ||
fa661258 MW |
934 | err = abx500_register_ops(&client->dev, &ab3100_ops); |
935 | if (err) | |
936 | goto exit_no_ops; | |
937 | ||
14fa5691 LW |
938 | /* Set parent and a pointer back to the container in device data */ |
939 | for (i = 0; i < ARRAY_SIZE(ab3100_platform_devs); i++) { | |
940 | ab3100_platform_devs[i]->dev.parent = | |
941 | &client->dev; | |
d619bc14 LW |
942 | ab3100_platform_devs[i]->dev.platform_data = |
943 | ab3100_plf_data; | |
14fa5691 LW |
944 | platform_set_drvdata(ab3100_platform_devs[i], ab3100); |
945 | } | |
946 | ||
947 | /* Register the platform devices */ | |
948 | platform_add_devices(ab3100_platform_devs, | |
949 | ARRAY_SIZE(ab3100_platform_devs)); | |
950 | ||
951 | ab3100_setup_debugfs(ab3100); | |
952 | ||
953 | return 0; | |
954 | ||
fa661258 | 955 | exit_no_ops: |
14fa5691 LW |
956 | exit_no_irq: |
957 | exit_no_setup: | |
958 | i2c_unregister_device(ab3100->testreg_client); | |
959 | exit_no_testreg_client: | |
960 | exit_no_detect: | |
961 | kfree(ab3100); | |
962 | return err; | |
963 | } | |
964 | ||
965 | static int __exit ab3100_remove(struct i2c_client *client) | |
966 | { | |
967 | struct ab3100 *ab3100 = i2c_get_clientdata(client); | |
968 | int i; | |
969 | ||
970 | /* Unregister subdevices */ | |
971 | for (i = 0; i < ARRAY_SIZE(ab3100_platform_devs); i++) | |
972 | platform_device_unregister(ab3100_platform_devs[i]); | |
973 | ||
974 | ab3100_remove_debugfs(); | |
975 | i2c_unregister_device(ab3100->testreg_client); | |
976 | ||
977 | /* | |
978 | * At this point, all subscribers should have unregistered | |
979 | * their notifiers so deactivate IRQ | |
980 | */ | |
981 | free_irq(client->irq, ab3100); | |
982 | kfree(ab3100); | |
983 | return 0; | |
984 | } | |
985 | ||
986 | static const struct i2c_device_id ab3100_id[] = { | |
dcffa125 | 987 | { "ab3100", 0 }, |
14fa5691 LW |
988 | { } |
989 | }; | |
990 | MODULE_DEVICE_TABLE(i2c, ab3100_id); | |
991 | ||
992 | static struct i2c_driver ab3100_driver = { | |
993 | .driver = { | |
994 | .name = "ab3100", | |
995 | .owner = THIS_MODULE, | |
996 | }, | |
997 | .id_table = ab3100_id, | |
998 | .probe = ab3100_probe, | |
999 | .remove = __exit_p(ab3100_remove), | |
1000 | }; | |
1001 | ||
1002 | static int __init ab3100_i2c_init(void) | |
1003 | { | |
1004 | return i2c_add_driver(&ab3100_driver); | |
1005 | } | |
1006 | ||
1007 | static void __exit ab3100_i2c_exit(void) | |
1008 | { | |
1009 | i2c_del_driver(&ab3100_driver); | |
1010 | } | |
1011 | ||
1012 | subsys_initcall(ab3100_i2c_init); | |
1013 | module_exit(ab3100_i2c_exit); | |
1014 | ||
1015 | MODULE_AUTHOR("Linus Walleij <linus.walleij@stericsson.com>"); | |
1016 | MODULE_DESCRIPTION("AB3100 core driver"); | |
1017 | MODULE_LICENSE("GPL"); |