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Linus Walleij14fa5692009-05-21 23:17:06 +02001/*
Linus Walleij2071db42010-01-19 11:41:52 +01002 * Copyright (C) 2007-2010 ST-Ericsson
Linus Walleij14fa5692009-05-21 23:17:06 +02003 * 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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090013#include <linux/slab.h>
Linus Walleij14fa5692009-05-21 23:17:06 +020014#include <linux/err.h>
Paul Gortmaker4e36dd32011-07-03 15:13:27 -040015#include <linux/module.h>
Linus Walleij14fa5692009-05-21 23:17:06 +020016#include <linux/platform_device.h>
17#include <linux/device.h>
18#include <linux/interrupt.h>
Linus Walleij2071db42010-01-19 11:41:52 +010019#include <linux/random.h>
Linus Walleij14fa5692009-05-21 23:17:06 +020020#include <linux/debugfs.h>
21#include <linux/seq_file.h>
22#include <linux/uaccess.h>
Linus Walleij8c96aef2010-08-20 10:27:12 +020023#include <linux/mfd/core.h>
Marcus Cooper0fd00132012-08-10 10:32:35 +020024#include <linux/mfd/ab3100.h>
Linus Walleij812f9e92010-05-01 18:26:07 +020025#include <linux/mfd/abx500.h>
Linus Walleij14fa5692009-05-21 23:17:06 +020026
27/* These are the only registers inside AB3100 used in this main file */
28
29/* Interrupt event registers */
30#define AB3100_EVENTA1 0x21
31#define AB3100_EVENTA2 0x22
32#define AB3100_EVENTA3 0x23
33
34/* AB3100 DAC converter registers */
35#define AB3100_DIS 0x00
36#define AB3100_D0C 0x01
37#define AB3100_D1C 0x02
38#define AB3100_D2C 0x03
39#define AB3100_D3C 0x04
40
41/* Chip ID register */
42#define AB3100_CID 0x20
43
44/* AB3100 interrupt registers */
45#define AB3100_IMRA1 0x24
46#define AB3100_IMRA2 0x25
47#define AB3100_IMRA3 0x26
48#define AB3100_IMRB1 0x2B
49#define AB3100_IMRB2 0x2C
50#define AB3100_IMRB3 0x2D
51
52/* System Power Monitoring and control registers */
53#define AB3100_MCA 0x2E
54#define AB3100_MCB 0x2F
55
56/* SIM power up */
57#define AB3100_SUP 0x50
58
59/*
60 * I2C communication
61 *
62 * The AB3100 is usually assigned address 0x48 (7-bit)
63 * The chip is defined in the platform i2c_board_data section.
64 */
Mattias Wallinfa661252010-05-01 18:26:20 +020065static int ab3100_get_chip_id(struct device *dev)
Linus Walleij14fa5692009-05-21 23:17:06 +020066{
Mattias Wallinfa661252010-05-01 18:26:20 +020067 struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
Linus Walleij14fa5692009-05-21 23:17:06 +020068
Mattias Wallinfa661252010-05-01 18:26:20 +020069 return (int)ab3100->chip_id;
Linus Walleij14fa5692009-05-21 23:17:06 +020070}
Linus Walleij14fa5692009-05-21 23:17:06 +020071
Mattias Wallinfa661252010-05-01 18:26:20 +020072static int ab3100_set_register_interruptible(struct ab3100 *ab3100,
73 u8 reg, u8 regval)
Linus Walleij14fa5692009-05-21 23:17:06 +020074{
75 u8 regandval[2] = {reg, regval};
76 int err;
77
78 err = mutex_lock_interruptible(&ab3100->access_mutex);
79 if (err)
80 return err;
81
82 /*
83 * A two-byte write message with the first byte containing the register
84 * number and the second byte containing the value to be written
85 * effectively sets a register in the AB3100.
86 */
87 err = i2c_master_send(ab3100->i2c_client, regandval, 2);
88 if (err < 0) {
89 dev_err(ab3100->dev,
90 "write error (write register): %d\n",
91 err);
92 } else if (err != 2) {
93 dev_err(ab3100->dev,
Lee Jonescd63a892014-05-08 13:47:15 +010094 "write error (write register)\n"
95 " %d bytes transferred (expected 2)\n",
Linus Walleij14fa5692009-05-21 23:17:06 +020096 err);
97 err = -EIO;
98 } else {
99 /* All is well */
100 err = 0;
101 }
102 mutex_unlock(&ab3100->access_mutex);
Linus Walleij7cdc2b92009-08-13 11:49:38 +0200103 return err;
Linus Walleij14fa5692009-05-21 23:17:06 +0200104}
Linus Walleij956f25a2009-08-13 11:49:23 +0200105
Mattias Wallinfa661252010-05-01 18:26:20 +0200106static int set_register_interruptible(struct device *dev,
107 u8 bank, u8 reg, u8 value)
108{
109 struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
110
111 return ab3100_set_register_interruptible(ab3100, reg, value);
112}
Linus Walleij14fa5692009-05-21 23:17:06 +0200113
114/*
115 * The test registers exist at an I2C bus address up one
116 * from the ordinary base. They are not supposed to be used
117 * in production code, but sometimes you have to do that
118 * anyway. It's currently only used from this file so declare
119 * it static and do not export.
120 */
Linus Walleij956f25a2009-08-13 11:49:23 +0200121static int ab3100_set_test_register_interruptible(struct ab3100 *ab3100,
Linus Walleij14fa5692009-05-21 23:17:06 +0200122 u8 reg, u8 regval)
123{
124 u8 regandval[2] = {reg, regval};
125 int err;
126
127 err = mutex_lock_interruptible(&ab3100->access_mutex);
128 if (err)
129 return err;
130
131 err = i2c_master_send(ab3100->testreg_client, regandval, 2);
132 if (err < 0) {
133 dev_err(ab3100->dev,
134 "write error (write test register): %d\n",
135 err);
136 } else if (err != 2) {
137 dev_err(ab3100->dev,
Lee Jonescd63a892014-05-08 13:47:15 +0100138 "write error (write test register)\n"
139 " %d bytes transferred (expected 2)\n",
Linus Walleij14fa5692009-05-21 23:17:06 +0200140 err);
141 err = -EIO;
142 } else {
143 /* All is well */
144 err = 0;
145 }
146 mutex_unlock(&ab3100->access_mutex);
147
148 return err;
149}
150
Mattias Wallinfa661252010-05-01 18:26:20 +0200151static int ab3100_get_register_interruptible(struct ab3100 *ab3100,
Linus Walleij8c96aef2010-08-20 10:27:12 +0200152 u8 reg, u8 *regval)
Linus Walleij14fa5692009-05-21 23:17:06 +0200153{
154 int err;
155
156 err = mutex_lock_interruptible(&ab3100->access_mutex);
157 if (err)
158 return err;
159
160 /*
161 * AB3100 require an I2C "stop" command between each message, else
162 * it will not work. The only way of achieveing this with the
163 * message transport layer is to send the read and write messages
164 * separately.
165 */
166 err = i2c_master_send(ab3100->i2c_client, &reg, 1);
167 if (err < 0) {
168 dev_err(ab3100->dev,
169 "write error (send register address): %d\n",
170 err);
171 goto get_reg_out_unlock;
172 } else if (err != 1) {
173 dev_err(ab3100->dev,
Lee Jonescd63a892014-05-08 13:47:15 +0100174 "write error (send register address)\n"
175 " %d bytes transferred (expected 1)\n",
Linus Walleij14fa5692009-05-21 23:17:06 +0200176 err);
177 err = -EIO;
178 goto get_reg_out_unlock;
179 } else {
180 /* All is well */
181 err = 0;
182 }
183
184 err = i2c_master_recv(ab3100->i2c_client, regval, 1);
185 if (err < 0) {
186 dev_err(ab3100->dev,
187 "write error (read register): %d\n",
188 err);
189 goto get_reg_out_unlock;
190 } else if (err != 1) {
191 dev_err(ab3100->dev,
Lee Jonescd63a892014-05-08 13:47:15 +0100192 "write error (read register)\n"
193 " %d bytes transferred (expected 1)\n",
Linus Walleij14fa5692009-05-21 23:17:06 +0200194 err);
195 err = -EIO;
196 goto get_reg_out_unlock;
197 } else {
198 /* All is well */
199 err = 0;
200 }
201
202 get_reg_out_unlock:
203 mutex_unlock(&ab3100->access_mutex);
204 return err;
205}
Linus Walleij14fa5692009-05-21 23:17:06 +0200206
Mattias Wallinfa661252010-05-01 18:26:20 +0200207static int get_register_interruptible(struct device *dev, u8 bank, u8 reg,
Linus Walleij8c96aef2010-08-20 10:27:12 +0200208 u8 *value)
Mattias Wallinfa661252010-05-01 18:26:20 +0200209{
210 struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
Linus Walleij956f25a2009-08-13 11:49:23 +0200211
Mattias Wallinfa661252010-05-01 18:26:20 +0200212 return ab3100_get_register_interruptible(ab3100, reg, value);
213}
214
215static int ab3100_get_register_page_interruptible(struct ab3100 *ab3100,
Linus Walleij14fa5692009-05-21 23:17:06 +0200216 u8 first_reg, u8 *regvals, u8 numregs)
217{
218 int err;
219
220 if (ab3100->chip_id == 0xa0 ||
221 ab3100->chip_id == 0xa1)
222 /* These don't support paged reads */
223 return -EIO;
224
225 err = mutex_lock_interruptible(&ab3100->access_mutex);
226 if (err)
227 return err;
228
229 /*
230 * Paged read also require an I2C "stop" command.
231 */
232 err = i2c_master_send(ab3100->i2c_client, &first_reg, 1);
233 if (err < 0) {
234 dev_err(ab3100->dev,
235 "write error (send first register address): %d\n",
236 err);
237 goto get_reg_page_out_unlock;
238 } else if (err != 1) {
239 dev_err(ab3100->dev,
Lee Jonescd63a892014-05-08 13:47:15 +0100240 "write error (send first register address)\n"
241 " %d bytes transferred (expected 1)\n",
Linus Walleij14fa5692009-05-21 23:17:06 +0200242 err);
243 err = -EIO;
244 goto get_reg_page_out_unlock;
245 }
246
247 err = i2c_master_recv(ab3100->i2c_client, regvals, numregs);
248 if (err < 0) {
249 dev_err(ab3100->dev,
250 "write error (read register page): %d\n",
251 err);
252 goto get_reg_page_out_unlock;
253 } else if (err != numregs) {
254 dev_err(ab3100->dev,
Lee Jonescd63a892014-05-08 13:47:15 +0100255 "write error (read register page)\n"
256 " %d bytes transferred (expected %d)\n",
Linus Walleij14fa5692009-05-21 23:17:06 +0200257 err, numregs);
258 err = -EIO;
259 goto get_reg_page_out_unlock;
260 }
261
262 /* All is well */
263 err = 0;
264
265 get_reg_page_out_unlock:
266 mutex_unlock(&ab3100->access_mutex);
267 return err;
268}
Linus Walleij14fa5692009-05-21 23:17:06 +0200269
Mattias Wallinfa661252010-05-01 18:26:20 +0200270static int get_register_page_interruptible(struct device *dev, u8 bank,
271 u8 first_reg, u8 *regvals, u8 numregs)
272{
273 struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
Linus Walleij956f25a2009-08-13 11:49:23 +0200274
Mattias Wallinfa661252010-05-01 18:26:20 +0200275 return ab3100_get_register_page_interruptible(ab3100,
276 first_reg, regvals, numregs);
277}
278
279static int ab3100_mask_and_set_register_interruptible(struct ab3100 *ab3100,
Linus Walleij14fa5692009-05-21 23:17:06 +0200280 u8 reg, u8 andmask, u8 ormask)
281{
282 u8 regandval[2] = {reg, 0};
283 int err;
284
285 err = mutex_lock_interruptible(&ab3100->access_mutex);
286 if (err)
287 return err;
288
289 /* First read out the target register */
290 err = i2c_master_send(ab3100->i2c_client, &reg, 1);
291 if (err < 0) {
292 dev_err(ab3100->dev,
293 "write error (maskset send address): %d\n",
294 err);
295 goto get_maskset_unlock;
296 } else if (err != 1) {
297 dev_err(ab3100->dev,
Lee Jonescd63a892014-05-08 13:47:15 +0100298 "write error (maskset send address)\n"
299 " %d bytes transferred (expected 1)\n",
Linus Walleij14fa5692009-05-21 23:17:06 +0200300 err);
301 err = -EIO;
302 goto get_maskset_unlock;
303 }
304
305 err = i2c_master_recv(ab3100->i2c_client, &regandval[1], 1);
306 if (err < 0) {
307 dev_err(ab3100->dev,
308 "write error (maskset read register): %d\n",
309 err);
310 goto get_maskset_unlock;
311 } else if (err != 1) {
312 dev_err(ab3100->dev,
Lee Jonescd63a892014-05-08 13:47:15 +0100313 "write error (maskset read register)\n"
314 " %d bytes transferred (expected 1)\n",
Linus Walleij14fa5692009-05-21 23:17:06 +0200315 err);
316 err = -EIO;
317 goto get_maskset_unlock;
318 }
319
320 /* Modify the register */
321 regandval[1] &= andmask;
322 regandval[1] |= ormask;
323
324 /* Write the register */
325 err = i2c_master_send(ab3100->i2c_client, regandval, 2);
326 if (err < 0) {
327 dev_err(ab3100->dev,
328 "write error (write register): %d\n",
329 err);
330 goto get_maskset_unlock;
331 } else if (err != 2) {
332 dev_err(ab3100->dev,
Lee Jonescd63a892014-05-08 13:47:15 +0100333 "write error (write register)\n"
334 " %d bytes transferred (expected 2)\n",
Linus Walleij14fa5692009-05-21 23:17:06 +0200335 err);
336 err = -EIO;
337 goto get_maskset_unlock;
338 }
339
340 /* All is well */
341 err = 0;
342
343 get_maskset_unlock:
344 mutex_unlock(&ab3100->access_mutex);
345 return err;
346}
Linus Walleij956f25a2009-08-13 11:49:23 +0200347
Mattias Wallinfa661252010-05-01 18:26:20 +0200348static int mask_and_set_register_interruptible(struct device *dev, u8 bank,
349 u8 reg, u8 bitmask, u8 bitvalues)
350{
351 struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
352
353 return ab3100_mask_and_set_register_interruptible(ab3100,
354 reg, bitmask, (bitmask & bitvalues));
355}
Linus Walleij14fa5692009-05-21 23:17:06 +0200356
357/*
358 * Register a simple callback for handling any AB3100 events.
359 */
360int ab3100_event_register(struct ab3100 *ab3100,
361 struct notifier_block *nb)
362{
363 return blocking_notifier_chain_register(&ab3100->event_subscribers,
364 nb);
365}
366EXPORT_SYMBOL(ab3100_event_register);
367
368/*
369 * Remove a previously registered callback.
370 */
371int ab3100_event_unregister(struct ab3100 *ab3100,
372 struct notifier_block *nb)
373{
Lee Jonescd63a892014-05-08 13:47:15 +0100374 return blocking_notifier_chain_unregister(&ab3100->event_subscribers,
Linus Walleij14fa5692009-05-21 23:17:06 +0200375 nb);
376}
377EXPORT_SYMBOL(ab3100_event_unregister);
378
379
Mattias Wallinfa661252010-05-01 18:26:20 +0200380static int ab3100_event_registers_startup_state_get(struct device *dev,
381 u8 *event)
Linus Walleij14fa5692009-05-21 23:17:06 +0200382{
Mattias Wallinfa661252010-05-01 18:26:20 +0200383 struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
Lee Jones15544ca2015-10-27 16:19:31 +0000384
Linus Walleij14fa5692009-05-21 23:17:06 +0200385 if (!ab3100->startup_events_read)
386 return -EAGAIN; /* Try again later */
Mattias Wallinfa661252010-05-01 18:26:20 +0200387 memcpy(event, ab3100->startup_events, 3);
Lee Jones15544ca2015-10-27 16:19:31 +0000388
Linus Walleij14fa5692009-05-21 23:17:06 +0200389 return 0;
390}
Mattias Wallinfa661252010-05-01 18:26:20 +0200391
392static struct abx500_ops ab3100_ops = {
393 .get_chip_id = ab3100_get_chip_id,
394 .set_register = set_register_interruptible,
395 .get_register = get_register_interruptible,
396 .get_register_page = get_register_page_interruptible,
397 .set_register_page = NULL,
398 .mask_and_set_register = mask_and_set_register_interruptible,
399 .event_registers_startup_state_get =
400 ab3100_event_registers_startup_state_get,
401 .startup_irq_enabled = NULL,
402};
Linus Walleij14fa5692009-05-21 23:17:06 +0200403
Linus Walleij0df883d2010-01-08 10:44:16 +0100404/*
405 * This is a threaded interrupt handler so we can make some
406 * I2C calls etc.
407 */
408static irqreturn_t ab3100_irq_handler(int irq, void *data)
Linus Walleij14fa5692009-05-21 23:17:06 +0200409{
Linus Walleij0df883d2010-01-08 10:44:16 +0100410 struct ab3100 *ab3100 = data;
Linus Walleij14fa5692009-05-21 23:17:06 +0200411 u8 event_regs[3];
412 u32 fatevent;
413 int err;
414
Linus Walleij956f25a2009-08-13 11:49:23 +0200415 err = ab3100_get_register_page_interruptible(ab3100, AB3100_EVENTA1,
Linus Walleij14fa5692009-05-21 23:17:06 +0200416 event_regs, 3);
417 if (err)
Linus Walleij0df883d2010-01-08 10:44:16 +0100418 goto err_event;
Linus Walleij14fa5692009-05-21 23:17:06 +0200419
420 fatevent = (event_regs[0] << 16) |
421 (event_regs[1] << 8) |
422 event_regs[2];
423
424 if (!ab3100->startup_events_read) {
Mattias Wallinfa661252010-05-01 18:26:20 +0200425 ab3100->startup_events[0] = event_regs[0];
426 ab3100->startup_events[1] = event_regs[1];
427 ab3100->startup_events[2] = event_regs[2];
Linus Walleij14fa5692009-05-21 23:17:06 +0200428 ab3100->startup_events_read = true;
429 }
430 /*
431 * The notified parties will have to mask out the events
432 * they're interested in and react to them. They will be
433 * notified on all events, then they use the fatevent value
434 * to determine if they're interested.
435 */
436 blocking_notifier_call_chain(&ab3100->event_subscribers,
437 fatevent, NULL);
438
439 dev_dbg(ab3100->dev,
440 "IRQ Event: 0x%08x\n", fatevent);
441
Linus Walleij0df883d2010-01-08 10:44:16 +0100442 return IRQ_HANDLED;
Linus Walleij14fa5692009-05-21 23:17:06 +0200443
Linus Walleij0df883d2010-01-08 10:44:16 +0100444 err_event:
Linus Walleij14fa5692009-05-21 23:17:06 +0200445 dev_dbg(ab3100->dev,
Linus Walleij0df883d2010-01-08 10:44:16 +0100446 "error reading event status\n");
Linus Walleij14fa5692009-05-21 23:17:06 +0200447 return IRQ_HANDLED;
448}
449
450#ifdef CONFIG_DEBUG_FS
451/*
452 * Some debugfs entries only exposed if we're using debug
453 */
454static int ab3100_registers_print(struct seq_file *s, void *p)
455{
456 struct ab3100 *ab3100 = s->private;
457 u8 value;
458 u8 reg;
459
Lee Jonescd63a892014-05-08 13:47:15 +0100460 seq_puts(s, "AB3100 registers:\n");
Linus Walleij14fa5692009-05-21 23:17:06 +0200461
462 for (reg = 0; reg < 0xff; reg++) {
Linus Walleij956f25a2009-08-13 11:49:23 +0200463 ab3100_get_register_interruptible(ab3100, reg, &value);
Linus Walleij14fa5692009-05-21 23:17:06 +0200464 seq_printf(s, "[0x%x]: 0x%x\n", reg, value);
465 }
466 return 0;
467}
468
469static int ab3100_registers_open(struct inode *inode, struct file *file)
470{
471 return single_open(file, ab3100_registers_print, inode->i_private);
472}
473
474static const struct file_operations ab3100_registers_fops = {
475 .open = ab3100_registers_open,
476 .read = seq_read,
477 .llseek = seq_lseek,
478 .release = single_release,
479 .owner = THIS_MODULE,
480};
481
482struct ab3100_get_set_reg_priv {
483 struct ab3100 *ab3100;
484 bool mode;
485};
486
Samuel Ortizdfc3aa72009-06-23 10:48:36 +0200487static ssize_t ab3100_get_set_reg(struct file *file,
488 const char __user *user_buf,
489 size_t count, loff_t *ppos)
Linus Walleij14fa5692009-05-21 23:17:06 +0200490{
491 struct ab3100_get_set_reg_priv *priv = file->private_data;
492 struct ab3100 *ab3100 = priv->ab3100;
493 char buf[32];
Samuel Ortizdfc3aa72009-06-23 10:48:36 +0200494 ssize_t buf_size;
Linus Walleij14fa5692009-05-21 23:17:06 +0200495 int regp;
Jingoo Han8420a242013-06-04 13:11:50 +0900496 u8 user_reg;
Linus Walleij14fa5692009-05-21 23:17:06 +0200497 int err;
498 int i = 0;
499
500 /* Get userspace string and assure termination */
501 buf_size = min(count, (sizeof(buf)-1));
502 if (copy_from_user(buf, user_buf, buf_size))
503 return -EFAULT;
504 buf[buf_size] = 0;
505
506 /*
507 * The idea is here to parse a string which is either
508 * "0xnn" for reading a register, or "0xaa 0xbb" for
509 * writing 0xbb to the register 0xaa. First move past
510 * whitespace and then begin to parse the register.
511 */
512 while ((i < buf_size) && (buf[i] == ' '))
513 i++;
514 regp = i;
515
516 /*
517 * Advance pointer to end of string then terminate
518 * the register string. This is needed to satisfy
Jingoo Han8420a242013-06-04 13:11:50 +0900519 * the kstrtou8() function.
Linus Walleij14fa5692009-05-21 23:17:06 +0200520 */
521 while ((i < buf_size) && (buf[i] != ' '))
522 i++;
523 buf[i] = '\0';
524
Jingoo Han8420a242013-06-04 13:11:50 +0900525 err = kstrtou8(&buf[regp], 16, &user_reg);
Linus Walleij14fa5692009-05-21 23:17:06 +0200526 if (err)
527 return err;
Linus Walleij14fa5692009-05-21 23:17:06 +0200528
529 /* Either we read or we write a register here */
530 if (!priv->mode) {
531 /* Reading */
Linus Walleij14fa5692009-05-21 23:17:06 +0200532 u8 regvalue;
533
Jingoo Han8420a242013-06-04 13:11:50 +0900534 ab3100_get_register_interruptible(ab3100, user_reg, &regvalue);
Linus Walleij14fa5692009-05-21 23:17:06 +0200535
536 dev_info(ab3100->dev,
537 "debug read AB3100 reg[0x%02x]: 0x%02x\n",
Jingoo Han8420a242013-06-04 13:11:50 +0900538 user_reg, regvalue);
Linus Walleij14fa5692009-05-21 23:17:06 +0200539 } else {
540 int valp;
Jingoo Han8420a242013-06-04 13:11:50 +0900541 u8 user_value;
Linus Walleij14fa5692009-05-21 23:17:06 +0200542 u8 regvalue;
543
544 /*
545 * Writing, we need some value to write to
546 * the register so keep parsing the string
547 * from userspace.
548 */
549 i++;
550 while ((i < buf_size) && (buf[i] == ' '))
551 i++;
552 valp = i;
553 while ((i < buf_size) && (buf[i] != ' '))
554 i++;
555 buf[i] = '\0';
556
Jingoo Han8420a242013-06-04 13:11:50 +0900557 err = kstrtou8(&buf[valp], 16, &user_value);
Linus Walleij14fa5692009-05-21 23:17:06 +0200558 if (err)
559 return err;
Linus Walleij14fa5692009-05-21 23:17:06 +0200560
Jingoo Han8420a242013-06-04 13:11:50 +0900561 ab3100_set_register_interruptible(ab3100, user_reg, user_value);
562 ab3100_get_register_interruptible(ab3100, user_reg, &regvalue);
Linus Walleij14fa5692009-05-21 23:17:06 +0200563
564 dev_info(ab3100->dev,
Lee Jonescd63a892014-05-08 13:47:15 +0100565 "debug write reg[0x%02x]\n"
566 " with 0x%02x, after readback: 0x%02x\n",
Jingoo Han8420a242013-06-04 13:11:50 +0900567 user_reg, user_value, regvalue);
Linus Walleij14fa5692009-05-21 23:17:06 +0200568 }
569 return buf_size;
570}
571
572static const struct file_operations ab3100_get_set_reg_fops = {
Stephen Boyd234e3402012-04-05 14:25:11 -0700573 .open = simple_open,
Linus Walleij14fa5692009-05-21 23:17:06 +0200574 .write = ab3100_get_set_reg,
Arnd Bergmann6038f372010-08-15 18:52:59 +0200575 .llseek = noop_llseek,
Linus Walleij14fa5692009-05-21 23:17:06 +0200576};
577
578static struct dentry *ab3100_dir;
579static struct dentry *ab3100_reg_file;
580static struct ab3100_get_set_reg_priv ab3100_get_priv;
581static struct dentry *ab3100_get_reg_file;
582static struct ab3100_get_set_reg_priv ab3100_set_priv;
583static struct dentry *ab3100_set_reg_file;
584
585static void ab3100_setup_debugfs(struct ab3100 *ab3100)
586{
587 int err;
588
589 ab3100_dir = debugfs_create_dir("ab3100", NULL);
590 if (!ab3100_dir)
591 goto exit_no_debugfs;
592
593 ab3100_reg_file = debugfs_create_file("registers",
594 S_IRUGO, ab3100_dir, ab3100,
595 &ab3100_registers_fops);
596 if (!ab3100_reg_file) {
597 err = -ENOMEM;
598 goto exit_destroy_dir;
599 }
600
601 ab3100_get_priv.ab3100 = ab3100;
602 ab3100_get_priv.mode = false;
603 ab3100_get_reg_file = debugfs_create_file("get_reg",
Vasiliy Kulikovf8a06972011-02-04 15:23:36 +0300604 S_IWUSR, ab3100_dir, &ab3100_get_priv,
Linus Walleij14fa5692009-05-21 23:17:06 +0200605 &ab3100_get_set_reg_fops);
606 if (!ab3100_get_reg_file) {
607 err = -ENOMEM;
608 goto exit_destroy_reg;
609 }
610
611 ab3100_set_priv.ab3100 = ab3100;
612 ab3100_set_priv.mode = true;
613 ab3100_set_reg_file = debugfs_create_file("set_reg",
Vasiliy Kulikovf8a06972011-02-04 15:23:36 +0300614 S_IWUSR, ab3100_dir, &ab3100_set_priv,
Linus Walleij14fa5692009-05-21 23:17:06 +0200615 &ab3100_get_set_reg_fops);
616 if (!ab3100_set_reg_file) {
617 err = -ENOMEM;
618 goto exit_destroy_get_reg;
619 }
620 return;
621
622 exit_destroy_get_reg:
623 debugfs_remove(ab3100_get_reg_file);
624 exit_destroy_reg:
625 debugfs_remove(ab3100_reg_file);
626 exit_destroy_dir:
627 debugfs_remove(ab3100_dir);
628 exit_no_debugfs:
629 return;
630}
631static inline void ab3100_remove_debugfs(void)
632{
633 debugfs_remove(ab3100_set_reg_file);
634 debugfs_remove(ab3100_get_reg_file);
635 debugfs_remove(ab3100_reg_file);
636 debugfs_remove(ab3100_dir);
637}
638#else
639static inline void ab3100_setup_debugfs(struct ab3100 *ab3100)
640{
641}
642static inline void ab3100_remove_debugfs(void)
643{
644}
645#endif
646
647/*
648 * Basic set-up, datastructure creation/destruction and I2C interface.
649 * This sets up a default config in the AB3100 chip so that it
650 * will work as expected.
651 */
652
653struct ab3100_init_setting {
654 u8 abreg;
655 u8 setting;
656};
657
Bill Pembertona73e5df2012-11-19 13:25:09 -0500658static const struct ab3100_init_setting ab3100_init_settings[] = {
Linus Walleij14fa5692009-05-21 23:17:06 +0200659 {
660 .abreg = AB3100_MCA,
661 .setting = 0x01
662 }, {
663 .abreg = AB3100_MCB,
664 .setting = 0x30
665 }, {
666 .abreg = AB3100_IMRA1,
667 .setting = 0x00
668 }, {
669 .abreg = AB3100_IMRA2,
670 .setting = 0xFF
671 }, {
672 .abreg = AB3100_IMRA3,
673 .setting = 0x01
674 }, {
675 .abreg = AB3100_IMRB1,
Linus Walleijce290b02009-08-13 11:49:49 +0200676 .setting = 0xBF
Linus Walleij14fa5692009-05-21 23:17:06 +0200677 }, {
678 .abreg = AB3100_IMRB2,
679 .setting = 0xFF
680 }, {
681 .abreg = AB3100_IMRB3,
682 .setting = 0xFF
683 }, {
684 .abreg = AB3100_SUP,
685 .setting = 0x00
686 }, {
687 .abreg = AB3100_DIS,
688 .setting = 0xF0
689 }, {
690 .abreg = AB3100_D0C,
691 .setting = 0x00
692 }, {
693 .abreg = AB3100_D1C,
694 .setting = 0x00
695 }, {
696 .abreg = AB3100_D2C,
697 .setting = 0x00
698 }, {
699 .abreg = AB3100_D3C,
700 .setting = 0x00
701 },
702};
703
Bill Pembertonf791be42012-11-19 13:23:04 -0500704static int ab3100_setup(struct ab3100 *ab3100)
Linus Walleij14fa5692009-05-21 23:17:06 +0200705{
706 int err = 0;
707 int i;
708
709 for (i = 0; i < ARRAY_SIZE(ab3100_init_settings); i++) {
Linus Walleij956f25a2009-08-13 11:49:23 +0200710 err = ab3100_set_register_interruptible(ab3100,
Linus Walleij14fa5692009-05-21 23:17:06 +0200711 ab3100_init_settings[i].abreg,
712 ab3100_init_settings[i].setting);
713 if (err)
714 goto exit_no_setup;
715 }
716
717 /*
718 * Special trick to make the AB3100 use the 32kHz clock (RTC)
Linus Walleij956f25a2009-08-13 11:49:23 +0200719 * bit 3 in test register 0x02 is a special, undocumented test
Linus Walleij14fa5692009-05-21 23:17:06 +0200720 * register bit that only exist in AB3100 P1E
721 */
722 if (ab3100->chip_id == 0xc4) {
723 dev_warn(ab3100->dev,
Lee Jonescd63a892014-05-08 13:47:15 +0100724 "AB3100 P1E variant detected forcing chip to 32KHz\n");
Mattias Wallinfa661252010-05-01 18:26:20 +0200725 err = ab3100_set_test_register_interruptible(ab3100,
726 0x02, 0x08);
Linus Walleij14fa5692009-05-21 23:17:06 +0200727 }
728
729 exit_no_setup:
730 return err;
731}
732
Linus Walleij8c96aef2010-08-20 10:27:12 +0200733/* The subdevices of the AB3100 */
734static struct mfd_cell ab3100_devs[] = {
735 {
736 .name = "ab3100-dac",
737 .id = -1,
738 },
739 {
740 .name = "ab3100-leds",
741 .id = -1,
742 },
743 {
744 .name = "ab3100-power",
745 .id = -1,
746 },
747 {
748 .name = "ab3100-regulators",
Linus Walleij8735bc22013-04-22 11:57:25 +0200749 .of_compatible = "stericsson,ab3100-regulators",
Linus Walleij8c96aef2010-08-20 10:27:12 +0200750 .id = -1,
751 },
752 {
753 .name = "ab3100-sim",
754 .id = -1,
755 },
756 {
757 .name = "ab3100-uart",
758 .id = -1,
759 },
760 {
761 .name = "ab3100-rtc",
762 .id = -1,
763 },
764 {
765 .name = "ab3100-charger",
766 .id = -1,
767 },
768 {
769 .name = "ab3100-boost",
770 .id = -1,
771 },
772 {
773 .name = "ab3100-adc",
774 .id = -1,
775 },
776 {
777 .name = "ab3100-fuelgauge",
778 .id = -1,
779 },
780 {
781 .name = "ab3100-vibrator",
782 .id = -1,
783 },
784 {
785 .name = "ab3100-otp",
786 .id = -1,
787 },
788 {
789 .name = "ab3100-codec",
790 .id = -1,
791 },
Linus Walleij14fa5692009-05-21 23:17:06 +0200792};
793
794struct ab_family_id {
795 u8 id;
796 char *name;
797};
798
Bill Pembertona73e5df2012-11-19 13:25:09 -0500799static const struct ab_family_id ids[] = {
Linus Walleij14fa5692009-05-21 23:17:06 +0200800 /* 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
Bill Pembertonf791be42012-11-19 13:23:04 -0500853static int ab3100_probe(struct i2c_client *client,
Linus Walleij25244682010-08-20 10:26:56 +0200854 const struct i2c_device_id *id)
Linus Walleij14fa5692009-05-21 23:17:06 +0200855{
856 struct ab3100 *ab3100;
Linus Walleijd619bc12009-09-09 11:31:00 +0200857 struct ab3100_platform_data *ab3100_plf_data =
Jingoo Han334a41c2013-07-30 17:10:05 +0900858 dev_get_platdata(&client->dev);
Linus Walleij14fa5692009-05-21 23:17:06 +0200859 int err;
860 int i;
861
Linus Walleij7f0f07c2012-06-12 20:26:58 +0200862 ab3100 = devm_kzalloc(&client->dev, sizeof(struct ab3100), GFP_KERNEL);
Lee Jones15544ca2015-10-27 16:19:31 +0000863 if (!ab3100)
Linus Walleij14fa5692009-05-21 23:17:06 +0200864 return -ENOMEM;
Linus Walleij14fa5692009-05-21 23:17:06 +0200865
866 /* Initialize data structure */
867 mutex_init(&ab3100->access_mutex);
868 BLOCKING_INIT_NOTIFIER_HEAD(&ab3100->event_subscribers);
869
870 ab3100->i2c_client = client;
871 ab3100->dev = &ab3100->i2c_client->dev;
872
873 i2c_set_clientdata(client, ab3100);
874
875 /* Read chip ID register */
Linus Walleij956f25a2009-08-13 11:49:23 +0200876 err = ab3100_get_register_interruptible(ab3100, AB3100_CID,
877 &ab3100->chip_id);
Linus Walleij14fa5692009-05-21 23:17:06 +0200878 if (err) {
879 dev_err(&client->dev,
Lee Jonescd63a892014-05-08 13:47:15 +0100880 "failed to communicate with AB3100 chip\n");
Linus Walleij14fa5692009-05-21 23:17:06 +0200881 goto exit_no_detect;
882 }
883
884 for (i = 0; ids[i].id != 0x0; i++) {
885 if (ids[i].id == ab3100->chip_id) {
Lee Jones15544ca2015-10-27 16:19:31 +0000886 if (ids[i].name)
Linus Walleij14fa5692009-05-21 23:17:06 +0200887 break;
Lee Jones15544ca2015-10-27 16:19:31 +0000888
889 dev_err(&client->dev, "AB3000 is not supported\n");
890 goto exit_no_detect;
Linus Walleij14fa5692009-05-21 23:17:06 +0200891 }
892 }
893
Lee Jones15544ca2015-10-27 16:19:31 +0000894 snprintf(&ab3100->chip_name[0],
895 sizeof(ab3100->chip_name) - 1, "AB3100 %s", ids[i].name);
896
Linus Walleij14fa5692009-05-21 23:17:06 +0200897 if (ids[i].id == 0x0) {
898 dev_err(&client->dev, "unknown analog baseband chip id: 0x%x\n",
899 ab3100->chip_id);
Lee Jonescd63a892014-05-08 13:47:15 +0100900 dev_err(&client->dev,
901 "accepting it anyway. Please update the driver.\n");
Linus Walleij14fa5692009-05-21 23:17:06 +0200902 goto exit_no_detect;
903 }
904
905 dev_info(&client->dev, "Detected chip: %s\n",
906 &ab3100->chip_name[0]);
907
908 /* Attach a second dummy i2c_client to the test register address */
909 ab3100->testreg_client = i2c_new_dummy(client->adapter,
Linus Walleij7f0f07c2012-06-12 20:26:58 +0200910 client->addr + 1);
Linus Walleij14fa5692009-05-21 23:17:06 +0200911 if (!ab3100->testreg_client) {
912 err = -ENOMEM;
913 goto exit_no_testreg_client;
914 }
915
Linus Walleij14fa5692009-05-21 23:17:06 +0200916 err = ab3100_setup(ab3100);
917 if (err)
918 goto exit_no_setup;
919
Linus Walleij7f0f07c2012-06-12 20:26:58 +0200920 err = devm_request_threaded_irq(&client->dev,
921 client->irq, NULL, ab3100_irq_handler,
922 IRQF_ONESHOT, "ab3100-core", ab3100);
Linus Walleij14fa5692009-05-21 23:17:06 +0200923 if (err)
924 goto exit_no_irq;
925
Mattias Wallinfa661252010-05-01 18:26:20 +0200926 err = abx500_register_ops(&client->dev, &ab3100_ops);
927 if (err)
928 goto exit_no_ops;
929
Linus Walleij8c96aef2010-08-20 10:27:12 +0200930 /* Set up and register the platform devices. */
Samuel Ortiza771e362011-04-06 00:41:43 +0200931 for (i = 0; i < ARRAY_SIZE(ab3100_devs); i++) {
932 ab3100_devs[i].platform_data = ab3100_plf_data;
933 ab3100_devs[i].pdata_size = sizeof(struct ab3100_platform_data);
934 }
Linus Walleij14fa5692009-05-21 23:17:06 +0200935
Linus Walleij8c96aef2010-08-20 10:27:12 +0200936 err = mfd_add_devices(&client->dev, 0, ab3100_devs,
Mark Brown55692af2012-09-11 15:16:36 +0800937 ARRAY_SIZE(ab3100_devs), NULL, 0, NULL);
Linus Walleij14fa5692009-05-21 23:17:06 +0200938
939 ab3100_setup_debugfs(ab3100);
940
941 return 0;
942
Mattias Wallinfa661252010-05-01 18:26:20 +0200943 exit_no_ops:
Linus Walleij14fa5692009-05-21 23:17:06 +0200944 exit_no_irq:
945 exit_no_setup:
946 i2c_unregister_device(ab3100->testreg_client);
947 exit_no_testreg_client:
948 exit_no_detect:
Linus Walleij14fa5692009-05-21 23:17:06 +0200949 return err;
950}
951
Bill Pemberton4740f732012-11-19 13:26:01 -0500952static int ab3100_remove(struct i2c_client *client)
Linus Walleij14fa5692009-05-21 23:17:06 +0200953{
954 struct ab3100 *ab3100 = i2c_get_clientdata(client);
Linus Walleij14fa5692009-05-21 23:17:06 +0200955
956 /* Unregister subdevices */
Linus Walleij8c96aef2010-08-20 10:27:12 +0200957 mfd_remove_devices(&client->dev);
Linus Walleij14fa5692009-05-21 23:17:06 +0200958 ab3100_remove_debugfs();
959 i2c_unregister_device(ab3100->testreg_client);
Linus Walleij14fa5692009-05-21 23:17:06 +0200960 return 0;
961}
962
963static const struct i2c_device_id ab3100_id[] = {
Jean Delvaredcffa122009-10-04 22:53:44 +0200964 { "ab3100", 0 },
Linus Walleij14fa5692009-05-21 23:17:06 +0200965 { }
966};
967MODULE_DEVICE_TABLE(i2c, ab3100_id);
968
969static struct i2c_driver ab3100_driver = {
970 .driver = {
971 .name = "ab3100",
Linus Walleij14fa5692009-05-21 23:17:06 +0200972 },
973 .id_table = ab3100_id,
974 .probe = ab3100_probe,
Bill Pemberton84449212012-11-19 13:20:24 -0500975 .remove = ab3100_remove,
Linus Walleij14fa5692009-05-21 23:17:06 +0200976};
977
978static int __init ab3100_i2c_init(void)
979{
980 return i2c_add_driver(&ab3100_driver);
981}
982
983static void __exit ab3100_i2c_exit(void)
984{
985 i2c_del_driver(&ab3100_driver);
986}
987
988subsys_initcall(ab3100_i2c_init);
989module_exit(ab3100_i2c_exit);
990
991MODULE_AUTHOR("Linus Walleij <linus.walleij@stericsson.com>");
992MODULE_DESCRIPTION("AB3100 core driver");
993MODULE_LICENSE("GPL");