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Commit | Line | Data |
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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 | 14 | #include <linux/err.h> |
4e36dd33 | 15 | #include <linux/module.h> |
14fa5691 LW |
16 | #include <linux/platform_device.h> |
17 | #include <linux/device.h> | |
18 | #include <linux/interrupt.h> | |
2071db48 | 19 | #include <linux/random.h> |
14fa5691 LW |
20 | #include <linux/debugfs.h> |
21 | #include <linux/seq_file.h> | |
22 | #include <linux/uaccess.h> | |
8c96aefb | 23 | #include <linux/mfd/core.h> |
812f9e9d | 24 | #include <linux/mfd/abx500.h> |
14fa5691 LW |
25 | |
26 | /* These are the only registers inside AB3100 used in this main file */ | |
27 | ||
28 | /* Interrupt event registers */ | |
29 | #define AB3100_EVENTA1 0x21 | |
30 | #define AB3100_EVENTA2 0x22 | |
31 | #define AB3100_EVENTA3 0x23 | |
32 | ||
33 | /* AB3100 DAC converter registers */ | |
34 | #define AB3100_DIS 0x00 | |
35 | #define AB3100_D0C 0x01 | |
36 | #define AB3100_D1C 0x02 | |
37 | #define AB3100_D2C 0x03 | |
38 | #define AB3100_D3C 0x04 | |
39 | ||
40 | /* Chip ID register */ | |
41 | #define AB3100_CID 0x20 | |
42 | ||
43 | /* AB3100 interrupt registers */ | |
44 | #define AB3100_IMRA1 0x24 | |
45 | #define AB3100_IMRA2 0x25 | |
46 | #define AB3100_IMRA3 0x26 | |
47 | #define AB3100_IMRB1 0x2B | |
48 | #define AB3100_IMRB2 0x2C | |
49 | #define AB3100_IMRB3 0x2D | |
50 | ||
51 | /* System Power Monitoring and control registers */ | |
52 | #define AB3100_MCA 0x2E | |
53 | #define AB3100_MCB 0x2F | |
54 | ||
55 | /* SIM power up */ | |
56 | #define AB3100_SUP 0x50 | |
57 | ||
58 | /* | |
59 | * I2C communication | |
60 | * | |
61 | * The AB3100 is usually assigned address 0x48 (7-bit) | |
62 | * The chip is defined in the platform i2c_board_data section. | |
63 | */ | |
fa661258 | 64 | static int ab3100_get_chip_id(struct device *dev) |
14fa5691 | 65 | { |
fa661258 MW |
66 | struct ab3100 *ab3100 = dev_get_drvdata(dev->parent); |
67 | ||
68 | return (int)ab3100->chip_id; | |
14fa5691 | 69 | } |
14fa5691 | 70 | |
fa661258 MW |
71 | static int ab3100_set_register_interruptible(struct ab3100 *ab3100, |
72 | u8 reg, u8 regval) | |
14fa5691 LW |
73 | { |
74 | u8 regandval[2] = {reg, regval}; | |
75 | int err; | |
76 | ||
77 | err = mutex_lock_interruptible(&ab3100->access_mutex); | |
78 | if (err) | |
79 | return err; | |
80 | ||
81 | /* | |
82 | * A two-byte write message with the first byte containing the register | |
83 | * number and the second byte containing the value to be written | |
84 | * effectively sets a register in the AB3100. | |
85 | */ | |
86 | err = i2c_master_send(ab3100->i2c_client, regandval, 2); | |
87 | if (err < 0) { | |
88 | dev_err(ab3100->dev, | |
89 | "write error (write register): %d\n", | |
90 | err); | |
91 | } else if (err != 2) { | |
92 | dev_err(ab3100->dev, | |
93 | "write error (write register) " | |
94 | "%d bytes transferred (expected 2)\n", | |
95 | err); | |
96 | err = -EIO; | |
97 | } else { | |
98 | /* All is well */ | |
99 | err = 0; | |
100 | } | |
101 | mutex_unlock(&ab3100->access_mutex); | |
7cdc2b98 | 102 | return err; |
14fa5691 | 103 | } |
956f25a6 | 104 | |
fa661258 MW |
105 | static int set_register_interruptible(struct device *dev, |
106 | u8 bank, u8 reg, u8 value) | |
107 | { | |
108 | struct ab3100 *ab3100 = dev_get_drvdata(dev->parent); | |
109 | ||
110 | return ab3100_set_register_interruptible(ab3100, reg, value); | |
111 | } | |
14fa5691 LW |
112 | |
113 | /* | |
114 | * The test registers exist at an I2C bus address up one | |
115 | * from the ordinary base. They are not supposed to be used | |
116 | * in production code, but sometimes you have to do that | |
117 | * anyway. It's currently only used from this file so declare | |
118 | * it static and do not export. | |
119 | */ | |
956f25a6 | 120 | static int ab3100_set_test_register_interruptible(struct ab3100 *ab3100, |
14fa5691 LW |
121 | u8 reg, u8 regval) |
122 | { | |
123 | u8 regandval[2] = {reg, regval}; | |
124 | int err; | |
125 | ||
126 | err = mutex_lock_interruptible(&ab3100->access_mutex); | |
127 | if (err) | |
128 | return err; | |
129 | ||
130 | err = i2c_master_send(ab3100->testreg_client, regandval, 2); | |
131 | if (err < 0) { | |
132 | dev_err(ab3100->dev, | |
133 | "write error (write test register): %d\n", | |
134 | err); | |
135 | } else if (err != 2) { | |
136 | dev_err(ab3100->dev, | |
137 | "write error (write test register) " | |
138 | "%d bytes transferred (expected 2)\n", | |
139 | err); | |
140 | err = -EIO; | |
141 | } else { | |
142 | /* All is well */ | |
143 | err = 0; | |
144 | } | |
145 | mutex_unlock(&ab3100->access_mutex); | |
146 | ||
147 | return err; | |
148 | } | |
149 | ||
fa661258 | 150 | static int ab3100_get_register_interruptible(struct ab3100 *ab3100, |
8c96aefb | 151 | u8 reg, u8 *regval) |
14fa5691 LW |
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 | } | |
956f25a6 | 205 | |
fa661258 | 206 | static int get_register_interruptible(struct device *dev, u8 bank, u8 reg, |
8c96aefb | 207 | u8 *value) |
fa661258 MW |
208 | { |
209 | struct ab3100 *ab3100 = dev_get_drvdata(dev->parent); | |
210 | ||
211 | return ab3100_get_register_interruptible(ab3100, reg, value); | |
212 | } | |
14fa5691 | 213 | |
fa661258 | 214 | static int ab3100_get_register_page_interruptible(struct ab3100 *ab3100, |
14fa5691 LW |
215 | u8 first_reg, u8 *regvals, u8 numregs) |
216 | { | |
217 | int err; | |
218 | ||
219 | if (ab3100->chip_id == 0xa0 || | |
220 | ab3100->chip_id == 0xa1) | |
221 | /* These don't support paged reads */ | |
222 | return -EIO; | |
223 | ||
224 | err = mutex_lock_interruptible(&ab3100->access_mutex); | |
225 | if (err) | |
226 | return err; | |
227 | ||
228 | /* | |
229 | * Paged read also require an I2C "stop" command. | |
230 | */ | |
231 | err = i2c_master_send(ab3100->i2c_client, &first_reg, 1); | |
232 | if (err < 0) { | |
233 | dev_err(ab3100->dev, | |
234 | "write error (send first register address): %d\n", | |
235 | err); | |
236 | goto get_reg_page_out_unlock; | |
237 | } else if (err != 1) { | |
238 | dev_err(ab3100->dev, | |
239 | "write error (send first register address) " | |
240 | "%d bytes transferred (expected 1)\n", | |
241 | err); | |
242 | err = -EIO; | |
243 | goto get_reg_page_out_unlock; | |
244 | } | |
245 | ||
246 | err = i2c_master_recv(ab3100->i2c_client, regvals, numregs); | |
247 | if (err < 0) { | |
248 | dev_err(ab3100->dev, | |
249 | "write error (read register page): %d\n", | |
250 | err); | |
251 | goto get_reg_page_out_unlock; | |
252 | } else if (err != numregs) { | |
253 | dev_err(ab3100->dev, | |
254 | "write error (read register page) " | |
255 | "%d bytes transferred (expected %d)\n", | |
256 | err, numregs); | |
257 | err = -EIO; | |
258 | goto get_reg_page_out_unlock; | |
259 | } | |
260 | ||
261 | /* All is well */ | |
262 | err = 0; | |
263 | ||
264 | get_reg_page_out_unlock: | |
265 | mutex_unlock(&ab3100->access_mutex); | |
266 | return err; | |
267 | } | |
14fa5691 | 268 | |
fa661258 MW |
269 | static int get_register_page_interruptible(struct device *dev, u8 bank, |
270 | u8 first_reg, u8 *regvals, u8 numregs) | |
271 | { | |
272 | struct ab3100 *ab3100 = dev_get_drvdata(dev->parent); | |
273 | ||
274 | return ab3100_get_register_page_interruptible(ab3100, | |
275 | first_reg, regvals, numregs); | |
276 | } | |
956f25a6 | 277 | |
fa661258 | 278 | static int ab3100_mask_and_set_register_interruptible(struct ab3100 *ab3100, |
14fa5691 LW |
279 | u8 reg, u8 andmask, u8 ormask) |
280 | { | |
281 | u8 regandval[2] = {reg, 0}; | |
282 | int err; | |
283 | ||
284 | err = mutex_lock_interruptible(&ab3100->access_mutex); | |
285 | if (err) | |
286 | return err; | |
287 | ||
288 | /* First read out the target register */ | |
289 | err = i2c_master_send(ab3100->i2c_client, ®, 1); | |
290 | if (err < 0) { | |
291 | dev_err(ab3100->dev, | |
292 | "write error (maskset send address): %d\n", | |
293 | err); | |
294 | goto get_maskset_unlock; | |
295 | } else if (err != 1) { | |
296 | dev_err(ab3100->dev, | |
297 | "write error (maskset send address) " | |
298 | "%d bytes transferred (expected 1)\n", | |
299 | err); | |
300 | err = -EIO; | |
301 | goto get_maskset_unlock; | |
302 | } | |
303 | ||
304 | err = i2c_master_recv(ab3100->i2c_client, ®andval[1], 1); | |
305 | if (err < 0) { | |
306 | dev_err(ab3100->dev, | |
307 | "write error (maskset read register): %d\n", | |
308 | err); | |
309 | goto get_maskset_unlock; | |
310 | } else if (err != 1) { | |
311 | dev_err(ab3100->dev, | |
312 | "write error (maskset read register) " | |
313 | "%d bytes transferred (expected 1)\n", | |
314 | err); | |
315 | err = -EIO; | |
316 | goto get_maskset_unlock; | |
317 | } | |
318 | ||
319 | /* Modify the register */ | |
320 | regandval[1] &= andmask; | |
321 | regandval[1] |= ormask; | |
322 | ||
323 | /* Write the register */ | |
324 | err = i2c_master_send(ab3100->i2c_client, regandval, 2); | |
325 | if (err < 0) { | |
326 | dev_err(ab3100->dev, | |
327 | "write error (write register): %d\n", | |
328 | err); | |
329 | goto get_maskset_unlock; | |
330 | } else if (err != 2) { | |
331 | dev_err(ab3100->dev, | |
332 | "write error (write register) " | |
333 | "%d bytes transferred (expected 2)\n", | |
334 | err); | |
335 | err = -EIO; | |
336 | goto get_maskset_unlock; | |
337 | } | |
338 | ||
339 | /* All is well */ | |
340 | err = 0; | |
341 | ||
342 | get_maskset_unlock: | |
343 | mutex_unlock(&ab3100->access_mutex); | |
344 | return err; | |
345 | } | |
956f25a6 | 346 | |
fa661258 MW |
347 | static int mask_and_set_register_interruptible(struct device *dev, u8 bank, |
348 | u8 reg, u8 bitmask, u8 bitvalues) | |
349 | { | |
350 | struct ab3100 *ab3100 = dev_get_drvdata(dev->parent); | |
351 | ||
352 | return ab3100_mask_and_set_register_interruptible(ab3100, | |
353 | reg, bitmask, (bitmask & bitvalues)); | |
354 | } | |
14fa5691 LW |
355 | |
356 | /* | |
357 | * Register a simple callback for handling any AB3100 events. | |
358 | */ | |
359 | int ab3100_event_register(struct ab3100 *ab3100, | |
360 | struct notifier_block *nb) | |
361 | { | |
362 | return blocking_notifier_chain_register(&ab3100->event_subscribers, | |
363 | nb); | |
364 | } | |
365 | EXPORT_SYMBOL(ab3100_event_register); | |
366 | ||
367 | /* | |
368 | * Remove a previously registered callback. | |
369 | */ | |
370 | int ab3100_event_unregister(struct ab3100 *ab3100, | |
371 | struct notifier_block *nb) | |
372 | { | |
373 | return blocking_notifier_chain_unregister(&ab3100->event_subscribers, | |
374 | nb); | |
375 | } | |
376 | EXPORT_SYMBOL(ab3100_event_unregister); | |
377 | ||
378 | ||
fa661258 MW |
379 | static int ab3100_event_registers_startup_state_get(struct device *dev, |
380 | u8 *event) | |
14fa5691 | 381 | { |
fa661258 | 382 | struct ab3100 *ab3100 = dev_get_drvdata(dev->parent); |
14fa5691 LW |
383 | if (!ab3100->startup_events_read) |
384 | return -EAGAIN; /* Try again later */ | |
fa661258 | 385 | memcpy(event, ab3100->startup_events, 3); |
14fa5691 LW |
386 | return 0; |
387 | } | |
fa661258 MW |
388 | |
389 | static struct abx500_ops ab3100_ops = { | |
390 | .get_chip_id = ab3100_get_chip_id, | |
391 | .set_register = set_register_interruptible, | |
392 | .get_register = get_register_interruptible, | |
393 | .get_register_page = get_register_page_interruptible, | |
394 | .set_register_page = NULL, | |
395 | .mask_and_set_register = mask_and_set_register_interruptible, | |
396 | .event_registers_startup_state_get = | |
397 | ab3100_event_registers_startup_state_get, | |
398 | .startup_irq_enabled = NULL, | |
399 | }; | |
14fa5691 | 400 | |
0df883df LW |
401 | /* |
402 | * This is a threaded interrupt handler so we can make some | |
403 | * I2C calls etc. | |
404 | */ | |
405 | static irqreturn_t ab3100_irq_handler(int irq, void *data) | |
14fa5691 | 406 | { |
0df883df | 407 | struct ab3100 *ab3100 = data; |
14fa5691 LW |
408 | u8 event_regs[3]; |
409 | u32 fatevent; | |
410 | int err; | |
411 | ||
2071db48 LW |
412 | add_interrupt_randomness(irq); |
413 | ||
956f25a6 | 414 | err = ab3100_get_register_page_interruptible(ab3100, AB3100_EVENTA1, |
14fa5691 LW |
415 | event_regs, 3); |
416 | if (err) | |
0df883df | 417 | goto err_event; |
14fa5691 LW |
418 | |
419 | fatevent = (event_regs[0] << 16) | | |
420 | (event_regs[1] << 8) | | |
421 | event_regs[2]; | |
422 | ||
423 | if (!ab3100->startup_events_read) { | |
fa661258 MW |
424 | ab3100->startup_events[0] = event_regs[0]; |
425 | ab3100->startup_events[1] = event_regs[1]; | |
426 | ab3100->startup_events[2] = event_regs[2]; | |
14fa5691 LW |
427 | ab3100->startup_events_read = true; |
428 | } | |
429 | /* | |
430 | * The notified parties will have to mask out the events | |
431 | * they're interested in and react to them. They will be | |
432 | * notified on all events, then they use the fatevent value | |
433 | * to determine if they're interested. | |
434 | */ | |
435 | blocking_notifier_call_chain(&ab3100->event_subscribers, | |
436 | fatevent, NULL); | |
437 | ||
438 | dev_dbg(ab3100->dev, | |
439 | "IRQ Event: 0x%08x\n", fatevent); | |
440 | ||
0df883df | 441 | return IRQ_HANDLED; |
14fa5691 | 442 | |
0df883df | 443 | err_event: |
14fa5691 | 444 | dev_dbg(ab3100->dev, |
0df883df | 445 | "error reading event status\n"); |
14fa5691 LW |
446 | return IRQ_HANDLED; |
447 | } | |
448 | ||
449 | #ifdef CONFIG_DEBUG_FS | |
450 | /* | |
451 | * Some debugfs entries only exposed if we're using debug | |
452 | */ | |
453 | static int ab3100_registers_print(struct seq_file *s, void *p) | |
454 | { | |
455 | struct ab3100 *ab3100 = s->private; | |
456 | u8 value; | |
457 | u8 reg; | |
458 | ||
459 | seq_printf(s, "AB3100 registers:\n"); | |
460 | ||
461 | for (reg = 0; reg < 0xff; reg++) { | |
956f25a6 | 462 | ab3100_get_register_interruptible(ab3100, reg, &value); |
14fa5691 LW |
463 | seq_printf(s, "[0x%x]: 0x%x\n", reg, value); |
464 | } | |
465 | return 0; | |
466 | } | |
467 | ||
468 | static int ab3100_registers_open(struct inode *inode, struct file *file) | |
469 | { | |
470 | return single_open(file, ab3100_registers_print, inode->i_private); | |
471 | } | |
472 | ||
473 | static const struct file_operations ab3100_registers_fops = { | |
474 | .open = ab3100_registers_open, | |
475 | .read = seq_read, | |
476 | .llseek = seq_lseek, | |
477 | .release = single_release, | |
478 | .owner = THIS_MODULE, | |
479 | }; | |
480 | ||
481 | struct ab3100_get_set_reg_priv { | |
482 | struct ab3100 *ab3100; | |
483 | bool mode; | |
484 | }; | |
485 | ||
486 | static int ab3100_get_set_reg_open_file(struct inode *inode, struct file *file) | |
487 | { | |
488 | file->private_data = inode->i_private; | |
489 | return 0; | |
490 | } | |
491 | ||
dfc3aa72 SO |
492 | static ssize_t ab3100_get_set_reg(struct file *file, |
493 | const char __user *user_buf, | |
494 | size_t count, loff_t *ppos) | |
14fa5691 LW |
495 | { |
496 | struct ab3100_get_set_reg_priv *priv = file->private_data; | |
497 | struct ab3100 *ab3100 = priv->ab3100; | |
498 | char buf[32]; | |
dfc3aa72 | 499 | ssize_t buf_size; |
14fa5691 LW |
500 | int regp; |
501 | unsigned long user_reg; | |
502 | int err; | |
503 | int i = 0; | |
504 | ||
505 | /* Get userspace string and assure termination */ | |
506 | buf_size = min(count, (sizeof(buf)-1)); | |
507 | if (copy_from_user(buf, user_buf, buf_size)) | |
508 | return -EFAULT; | |
509 | buf[buf_size] = 0; | |
510 | ||
511 | /* | |
512 | * The idea is here to parse a string which is either | |
513 | * "0xnn" for reading a register, or "0xaa 0xbb" for | |
514 | * writing 0xbb to the register 0xaa. First move past | |
515 | * whitespace and then begin to parse the register. | |
516 | */ | |
517 | while ((i < buf_size) && (buf[i] == ' ')) | |
518 | i++; | |
519 | regp = i; | |
520 | ||
521 | /* | |
522 | * Advance pointer to end of string then terminate | |
523 | * the register string. This is needed to satisfy | |
524 | * the strict_strtoul() function. | |
525 | */ | |
526 | while ((i < buf_size) && (buf[i] != ' ')) | |
527 | i++; | |
528 | buf[i] = '\0'; | |
529 | ||
530 | err = strict_strtoul(&buf[regp], 16, &user_reg); | |
531 | if (err) | |
532 | return err; | |
533 | if (user_reg > 0xff) | |
534 | return -EINVAL; | |
535 | ||
536 | /* Either we read or we write a register here */ | |
537 | if (!priv->mode) { | |
538 | /* Reading */ | |
539 | u8 reg = (u8) user_reg; | |
540 | u8 regvalue; | |
541 | ||
956f25a6 | 542 | ab3100_get_register_interruptible(ab3100, reg, ®value); |
14fa5691 LW |
543 | |
544 | dev_info(ab3100->dev, | |
545 | "debug read AB3100 reg[0x%02x]: 0x%02x\n", | |
546 | reg, regvalue); | |
547 | } else { | |
548 | int valp; | |
549 | unsigned long user_value; | |
550 | u8 reg = (u8) user_reg; | |
551 | u8 value; | |
552 | u8 regvalue; | |
553 | ||
554 | /* | |
555 | * Writing, we need some value to write to | |
556 | * the register so keep parsing the string | |
557 | * from userspace. | |
558 | */ | |
559 | i++; | |
560 | while ((i < buf_size) && (buf[i] == ' ')) | |
561 | i++; | |
562 | valp = i; | |
563 | while ((i < buf_size) && (buf[i] != ' ')) | |
564 | i++; | |
565 | buf[i] = '\0'; | |
566 | ||
567 | err = strict_strtoul(&buf[valp], 16, &user_value); | |
568 | if (err) | |
569 | return err; | |
570 | if (user_reg > 0xff) | |
571 | return -EINVAL; | |
572 | ||
573 | value = (u8) user_value; | |
956f25a6 LW |
574 | ab3100_set_register_interruptible(ab3100, reg, value); |
575 | ab3100_get_register_interruptible(ab3100, reg, ®value); | |
14fa5691 LW |
576 | |
577 | dev_info(ab3100->dev, | |
578 | "debug write reg[0x%02x] with 0x%02x, " | |
579 | "after readback: 0x%02x\n", | |
580 | reg, value, regvalue); | |
581 | } | |
582 | return buf_size; | |
583 | } | |
584 | ||
585 | static const struct file_operations ab3100_get_set_reg_fops = { | |
586 | .open = ab3100_get_set_reg_open_file, | |
587 | .write = ab3100_get_set_reg, | |
6038f373 | 588 | .llseek = noop_llseek, |
14fa5691 LW |
589 | }; |
590 | ||
591 | static struct dentry *ab3100_dir; | |
592 | static struct dentry *ab3100_reg_file; | |
593 | static struct ab3100_get_set_reg_priv ab3100_get_priv; | |
594 | static struct dentry *ab3100_get_reg_file; | |
595 | static struct ab3100_get_set_reg_priv ab3100_set_priv; | |
596 | static struct dentry *ab3100_set_reg_file; | |
597 | ||
598 | static void ab3100_setup_debugfs(struct ab3100 *ab3100) | |
599 | { | |
600 | int err; | |
601 | ||
602 | ab3100_dir = debugfs_create_dir("ab3100", NULL); | |
603 | if (!ab3100_dir) | |
604 | goto exit_no_debugfs; | |
605 | ||
606 | ab3100_reg_file = debugfs_create_file("registers", | |
607 | S_IRUGO, ab3100_dir, ab3100, | |
608 | &ab3100_registers_fops); | |
609 | if (!ab3100_reg_file) { | |
610 | err = -ENOMEM; | |
611 | goto exit_destroy_dir; | |
612 | } | |
613 | ||
614 | ab3100_get_priv.ab3100 = ab3100; | |
615 | ab3100_get_priv.mode = false; | |
616 | ab3100_get_reg_file = debugfs_create_file("get_reg", | |
f8a06977 | 617 | S_IWUSR, ab3100_dir, &ab3100_get_priv, |
14fa5691 LW |
618 | &ab3100_get_set_reg_fops); |
619 | if (!ab3100_get_reg_file) { | |
620 | err = -ENOMEM; | |
621 | goto exit_destroy_reg; | |
622 | } | |
623 | ||
624 | ab3100_set_priv.ab3100 = ab3100; | |
625 | ab3100_set_priv.mode = true; | |
626 | ab3100_set_reg_file = debugfs_create_file("set_reg", | |
f8a06977 | 627 | S_IWUSR, ab3100_dir, &ab3100_set_priv, |
14fa5691 LW |
628 | &ab3100_get_set_reg_fops); |
629 | if (!ab3100_set_reg_file) { | |
630 | err = -ENOMEM; | |
631 | goto exit_destroy_get_reg; | |
632 | } | |
633 | return; | |
634 | ||
635 | exit_destroy_get_reg: | |
636 | debugfs_remove(ab3100_get_reg_file); | |
637 | exit_destroy_reg: | |
638 | debugfs_remove(ab3100_reg_file); | |
639 | exit_destroy_dir: | |
640 | debugfs_remove(ab3100_dir); | |
641 | exit_no_debugfs: | |
642 | return; | |
643 | } | |
644 | static inline void ab3100_remove_debugfs(void) | |
645 | { | |
646 | debugfs_remove(ab3100_set_reg_file); | |
647 | debugfs_remove(ab3100_get_reg_file); | |
648 | debugfs_remove(ab3100_reg_file); | |
649 | debugfs_remove(ab3100_dir); | |
650 | } | |
651 | #else | |
652 | static inline void ab3100_setup_debugfs(struct ab3100 *ab3100) | |
653 | { | |
654 | } | |
655 | static inline void ab3100_remove_debugfs(void) | |
656 | { | |
657 | } | |
658 | #endif | |
659 | ||
660 | /* | |
661 | * Basic set-up, datastructure creation/destruction and I2C interface. | |
662 | * This sets up a default config in the AB3100 chip so that it | |
663 | * will work as expected. | |
664 | */ | |
665 | ||
666 | struct ab3100_init_setting { | |
667 | u8 abreg; | |
668 | u8 setting; | |
669 | }; | |
670 | ||
2524468e | 671 | static const struct ab3100_init_setting __devinitconst |
14fa5691 LW |
672 | ab3100_init_settings[] = { |
673 | { | |
674 | .abreg = AB3100_MCA, | |
675 | .setting = 0x01 | |
676 | }, { | |
677 | .abreg = AB3100_MCB, | |
678 | .setting = 0x30 | |
679 | }, { | |
680 | .abreg = AB3100_IMRA1, | |
681 | .setting = 0x00 | |
682 | }, { | |
683 | .abreg = AB3100_IMRA2, | |
684 | .setting = 0xFF | |
685 | }, { | |
686 | .abreg = AB3100_IMRA3, | |
687 | .setting = 0x01 | |
688 | }, { | |
689 | .abreg = AB3100_IMRB1, | |
ce290b0e | 690 | .setting = 0xBF |
14fa5691 LW |
691 | }, { |
692 | .abreg = AB3100_IMRB2, | |
693 | .setting = 0xFF | |
694 | }, { | |
695 | .abreg = AB3100_IMRB3, | |
696 | .setting = 0xFF | |
697 | }, { | |
698 | .abreg = AB3100_SUP, | |
699 | .setting = 0x00 | |
700 | }, { | |
701 | .abreg = AB3100_DIS, | |
702 | .setting = 0xF0 | |
703 | }, { | |
704 | .abreg = AB3100_D0C, | |
705 | .setting = 0x00 | |
706 | }, { | |
707 | .abreg = AB3100_D1C, | |
708 | .setting = 0x00 | |
709 | }, { | |
710 | .abreg = AB3100_D2C, | |
711 | .setting = 0x00 | |
712 | }, { | |
713 | .abreg = AB3100_D3C, | |
714 | .setting = 0x00 | |
715 | }, | |
716 | }; | |
717 | ||
2524468e | 718 | static int __devinit ab3100_setup(struct ab3100 *ab3100) |
14fa5691 LW |
719 | { |
720 | int err = 0; | |
721 | int i; | |
722 | ||
723 | for (i = 0; i < ARRAY_SIZE(ab3100_init_settings); i++) { | |
956f25a6 | 724 | err = ab3100_set_register_interruptible(ab3100, |
14fa5691 LW |
725 | ab3100_init_settings[i].abreg, |
726 | ab3100_init_settings[i].setting); | |
727 | if (err) | |
728 | goto exit_no_setup; | |
729 | } | |
730 | ||
731 | /* | |
732 | * Special trick to make the AB3100 use the 32kHz clock (RTC) | |
956f25a6 | 733 | * bit 3 in test register 0x02 is a special, undocumented test |
14fa5691 LW |
734 | * register bit that only exist in AB3100 P1E |
735 | */ | |
736 | if (ab3100->chip_id == 0xc4) { | |
737 | dev_warn(ab3100->dev, | |
738 | "AB3100 P1E variant detected, " | |
739 | "forcing chip to 32KHz\n"); | |
fa661258 MW |
740 | err = ab3100_set_test_register_interruptible(ab3100, |
741 | 0x02, 0x08); | |
14fa5691 LW |
742 | } |
743 | ||
744 | exit_no_setup: | |
745 | return err; | |
746 | } | |
747 | ||
8c96aefb LW |
748 | /* The subdevices of the AB3100 */ |
749 | static struct mfd_cell ab3100_devs[] = { | |
750 | { | |
751 | .name = "ab3100-dac", | |
752 | .id = -1, | |
753 | }, | |
754 | { | |
755 | .name = "ab3100-leds", | |
756 | .id = -1, | |
757 | }, | |
758 | { | |
759 | .name = "ab3100-power", | |
760 | .id = -1, | |
761 | }, | |
762 | { | |
763 | .name = "ab3100-regulators", | |
764 | .id = -1, | |
765 | }, | |
766 | { | |
767 | .name = "ab3100-sim", | |
768 | .id = -1, | |
769 | }, | |
770 | { | |
771 | .name = "ab3100-uart", | |
772 | .id = -1, | |
773 | }, | |
774 | { | |
775 | .name = "ab3100-rtc", | |
776 | .id = -1, | |
777 | }, | |
778 | { | |
779 | .name = "ab3100-charger", | |
780 | .id = -1, | |
781 | }, | |
782 | { | |
783 | .name = "ab3100-boost", | |
784 | .id = -1, | |
785 | }, | |
786 | { | |
787 | .name = "ab3100-adc", | |
788 | .id = -1, | |
789 | }, | |
790 | { | |
791 | .name = "ab3100-fuelgauge", | |
792 | .id = -1, | |
793 | }, | |
794 | { | |
795 | .name = "ab3100-vibrator", | |
796 | .id = -1, | |
797 | }, | |
798 | { | |
799 | .name = "ab3100-otp", | |
800 | .id = -1, | |
801 | }, | |
802 | { | |
803 | .name = "ab3100-codec", | |
804 | .id = -1, | |
805 | }, | |
14fa5691 LW |
806 | }; |
807 | ||
808 | struct ab_family_id { | |
809 | u8 id; | |
810 | char *name; | |
811 | }; | |
812 | ||
2f8491d3 | 813 | static const struct ab_family_id ids[] __devinitconst = { |
14fa5691 LW |
814 | /* AB3100 */ |
815 | { | |
816 | .id = 0xc0, | |
817 | .name = "P1A" | |
818 | }, { | |
819 | .id = 0xc1, | |
820 | .name = "P1B" | |
821 | }, { | |
822 | .id = 0xc2, | |
823 | .name = "P1C" | |
824 | }, { | |
825 | .id = 0xc3, | |
826 | .name = "P1D" | |
827 | }, { | |
828 | .id = 0xc4, | |
829 | .name = "P1E" | |
830 | }, { | |
831 | .id = 0xc5, | |
832 | .name = "P1F/R1A" | |
833 | }, { | |
834 | .id = 0xc6, | |
835 | .name = "P1G/R1A" | |
836 | }, { | |
837 | .id = 0xc7, | |
838 | .name = "P2A/R2A" | |
839 | }, { | |
840 | .id = 0xc8, | |
841 | .name = "P2B/R2B" | |
842 | }, | |
843 | /* AB3000 variants, not supported */ | |
844 | { | |
845 | .id = 0xa0 | |
846 | }, { | |
847 | .id = 0xa1 | |
848 | }, { | |
849 | .id = 0xa2 | |
850 | }, { | |
851 | .id = 0xa3 | |
852 | }, { | |
853 | .id = 0xa4 | |
854 | }, { | |
855 | .id = 0xa5 | |
856 | }, { | |
857 | .id = 0xa6 | |
858 | }, { | |
859 | .id = 0xa7 | |
860 | }, | |
861 | /* Terminator */ | |
862 | { | |
863 | .id = 0x00, | |
864 | }, | |
865 | }; | |
866 | ||
2524468e LW |
867 | static int __devinit ab3100_probe(struct i2c_client *client, |
868 | const struct i2c_device_id *id) | |
14fa5691 LW |
869 | { |
870 | struct ab3100 *ab3100; | |
d619bc14 LW |
871 | struct ab3100_platform_data *ab3100_plf_data = |
872 | client->dev.platform_data; | |
14fa5691 LW |
873 | int err; |
874 | int i; | |
875 | ||
876 | ab3100 = kzalloc(sizeof(struct ab3100), GFP_KERNEL); | |
877 | if (!ab3100) { | |
878 | dev_err(&client->dev, "could not allocate AB3100 device\n"); | |
879 | return -ENOMEM; | |
880 | } | |
881 | ||
882 | /* Initialize data structure */ | |
883 | mutex_init(&ab3100->access_mutex); | |
884 | BLOCKING_INIT_NOTIFIER_HEAD(&ab3100->event_subscribers); | |
885 | ||
886 | ab3100->i2c_client = client; | |
887 | ab3100->dev = &ab3100->i2c_client->dev; | |
888 | ||
889 | i2c_set_clientdata(client, ab3100); | |
890 | ||
891 | /* Read chip ID register */ | |
956f25a6 LW |
892 | err = ab3100_get_register_interruptible(ab3100, AB3100_CID, |
893 | &ab3100->chip_id); | |
14fa5691 LW |
894 | if (err) { |
895 | dev_err(&client->dev, | |
896 | "could not communicate with the AB3100 analog " | |
897 | "baseband chip\n"); | |
898 | goto exit_no_detect; | |
899 | } | |
900 | ||
901 | for (i = 0; ids[i].id != 0x0; i++) { | |
902 | if (ids[i].id == ab3100->chip_id) { | |
903 | if (ids[i].name != NULL) { | |
904 | snprintf(&ab3100->chip_name[0], | |
905 | sizeof(ab3100->chip_name) - 1, | |
906 | "AB3100 %s", | |
907 | ids[i].name); | |
908 | break; | |
909 | } else { | |
910 | dev_err(&client->dev, | |
911 | "AB3000 is not supported\n"); | |
912 | goto exit_no_detect; | |
913 | } | |
914 | } | |
915 | } | |
916 | ||
917 | if (ids[i].id == 0x0) { | |
918 | dev_err(&client->dev, "unknown analog baseband chip id: 0x%x\n", | |
919 | ab3100->chip_id); | |
920 | dev_err(&client->dev, "accepting it anyway. Please update " | |
921 | "the driver.\n"); | |
922 | goto exit_no_detect; | |
923 | } | |
924 | ||
925 | dev_info(&client->dev, "Detected chip: %s\n", | |
926 | &ab3100->chip_name[0]); | |
927 | ||
928 | /* Attach a second dummy i2c_client to the test register address */ | |
929 | ab3100->testreg_client = i2c_new_dummy(client->adapter, | |
930 | client->addr + 1); | |
931 | if (!ab3100->testreg_client) { | |
932 | err = -ENOMEM; | |
933 | goto exit_no_testreg_client; | |
934 | } | |
935 | ||
14fa5691 LW |
936 | err = ab3100_setup(ab3100); |
937 | if (err) | |
938 | goto exit_no_setup; | |
939 | ||
0df883df | 940 | err = request_threaded_irq(client->irq, NULL, ab3100_irq_handler, |
2071db48 LW |
941 | IRQF_ONESHOT, "ab3100-core", ab3100); |
942 | /* This real unpredictable IRQ is of course sampled for entropy */ | |
943 | rand_initialize_irq(client->irq); | |
944 | ||
14fa5691 LW |
945 | if (err) |
946 | goto exit_no_irq; | |
947 | ||
fa661258 MW |
948 | err = abx500_register_ops(&client->dev, &ab3100_ops); |
949 | if (err) | |
950 | goto exit_no_ops; | |
951 | ||
8c96aefb | 952 | /* Set up and register the platform devices. */ |
a771e36e SO |
953 | for (i = 0; i < ARRAY_SIZE(ab3100_devs); i++) { |
954 | ab3100_devs[i].platform_data = ab3100_plf_data; | |
955 | ab3100_devs[i].pdata_size = sizeof(struct ab3100_platform_data); | |
956 | } | |
14fa5691 | 957 | |
8c96aefb LW |
958 | err = mfd_add_devices(&client->dev, 0, ab3100_devs, |
959 | ARRAY_SIZE(ab3100_devs), NULL, 0); | |
14fa5691 LW |
960 | |
961 | ab3100_setup_debugfs(ab3100); | |
962 | ||
963 | return 0; | |
964 | ||
fa661258 | 965 | exit_no_ops: |
14fa5691 LW |
966 | exit_no_irq: |
967 | exit_no_setup: | |
968 | i2c_unregister_device(ab3100->testreg_client); | |
969 | exit_no_testreg_client: | |
970 | exit_no_detect: | |
971 | kfree(ab3100); | |
972 | return err; | |
973 | } | |
974 | ||
2524468e | 975 | static int __devexit ab3100_remove(struct i2c_client *client) |
14fa5691 LW |
976 | { |
977 | struct ab3100 *ab3100 = i2c_get_clientdata(client); | |
14fa5691 LW |
978 | |
979 | /* Unregister subdevices */ | |
8c96aefb | 980 | mfd_remove_devices(&client->dev); |
14fa5691 LW |
981 | |
982 | ab3100_remove_debugfs(); | |
983 | i2c_unregister_device(ab3100->testreg_client); | |
984 | ||
985 | /* | |
986 | * At this point, all subscribers should have unregistered | |
987 | * their notifiers so deactivate IRQ | |
988 | */ | |
989 | free_irq(client->irq, ab3100); | |
990 | kfree(ab3100); | |
991 | return 0; | |
992 | } | |
993 | ||
994 | static const struct i2c_device_id ab3100_id[] = { | |
dcffa125 | 995 | { "ab3100", 0 }, |
14fa5691 LW |
996 | { } |
997 | }; | |
998 | MODULE_DEVICE_TABLE(i2c, ab3100_id); | |
999 | ||
1000 | static struct i2c_driver ab3100_driver = { | |
1001 | .driver = { | |
1002 | .name = "ab3100", | |
1003 | .owner = THIS_MODULE, | |
1004 | }, | |
1005 | .id_table = ab3100_id, | |
1006 | .probe = ab3100_probe, | |
2524468e | 1007 | .remove = __devexit_p(ab3100_remove), |
14fa5691 LW |
1008 | }; |
1009 | ||
1010 | static int __init ab3100_i2c_init(void) | |
1011 | { | |
1012 | return i2c_add_driver(&ab3100_driver); | |
1013 | } | |
1014 | ||
1015 | static void __exit ab3100_i2c_exit(void) | |
1016 | { | |
1017 | i2c_del_driver(&ab3100_driver); | |
1018 | } | |
1019 | ||
1020 | subsys_initcall(ab3100_i2c_init); | |
1021 | module_exit(ab3100_i2c_exit); | |
1022 | ||
1023 | MODULE_AUTHOR("Linus Walleij <linus.walleij@stericsson.com>"); | |
1024 | MODULE_DESCRIPTION("AB3100 core driver"); | |
1025 | MODULE_LICENSE("GPL"); |