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-rw-r--r--drivers/mfd/Kconfig14
-rw-r--r--drivers/mfd/Makefile3
-rw-r--r--drivers/mfd/ab3100-core.c991
3 files changed, 1007 insertions, 1 deletions
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index ee3927ab11e0..61f0346650b3 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -241,6 +241,20 @@ config PCF50633_GPIO
241 Say yes here if you want to include support GPIO for pins on 241 Say yes here if you want to include support GPIO for pins on
242 the PCF50633 chip. 242 the PCF50633 chip.
243 243
244config AB3100_CORE
245 tristate "ST-Ericsson AB3100 Mixed Signal Circuit core functions"
246 depends on I2C
247 default y if ARCH_U300
248 help
249 Select this to enable the AB3100 Mixed Signal IC core
250 functionality. This connects to a AB3100 on the I2C bus
251 and expose a number of symbols needed for dependent devices
252 to read and write registers and subscribe to events from
253 this multi-functional IC. This is needed to use other features
254 of the AB3100 such as battery-backed RTC, charging control,
255 LEDs, vibrator, system power and temperature, power management
256 and ALSA sound.
257
244endmenu 258endmenu
245 259
246menu "Multimedia Capabilities Port drivers" 260menu "Multimedia Capabilities Port drivers"
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 3afb5192e4da..f5f337143e69 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -40,4 +40,5 @@ obj-$(CONFIG_PMIC_DA903X) += da903x.o
40 40
41obj-$(CONFIG_MFD_PCF50633) += pcf50633-core.o 41obj-$(CONFIG_MFD_PCF50633) += pcf50633-core.o
42obj-$(CONFIG_PCF50633_ADC) += pcf50633-adc.o 42obj-$(CONFIG_PCF50633_ADC) += pcf50633-adc.o
43obj-$(CONFIG_PCF50633_GPIO) += pcf50633-gpio.o \ No newline at end of file 43obj-$(CONFIG_PCF50633_GPIO) += pcf50633-gpio.o
44obj-$(CONFIG_AB3100_CORE) += ab3100-core.o
diff --git a/drivers/mfd/ab3100-core.c b/drivers/mfd/ab3100-core.c
new file mode 100644
index 000000000000..13e7d7bfe85f
--- /dev/null
+++ b/drivers/mfd/ab3100-core.c
@@ -0,0 +1,991 @@
1/*
2 * Copyright (C) 2007-2009 ST-Ericsson
3 * License terms: GNU General Public License (GPL) version 2
4 * Low-level core for exclusive access to the AB3100 IC on the I2C bus
5 * and some basic chip-configuration.
6 * Author: Linus Walleij <linus.walleij@stericsson.com>
7 */
8
9#include <linux/i2c.h>
10#include <linux/mutex.h>
11#include <linux/list.h>
12#include <linux/notifier.h>
13#include <linux/err.h>
14#include <linux/platform_device.h>
15#include <linux/device.h>
16#include <linux/interrupt.h>
17#include <linux/workqueue.h>
18#include <linux/debugfs.h>
19#include <linux/seq_file.h>
20#include <linux/uaccess.h>
21#include <linux/mfd/ab3100.h>
22
23/* These are the only registers inside AB3100 used in this main file */
24
25/* Interrupt event registers */
26#define AB3100_EVENTA1 0x21
27#define AB3100_EVENTA2 0x22
28#define AB3100_EVENTA3 0x23
29
30/* AB3100 DAC converter registers */
31#define AB3100_DIS 0x00
32#define AB3100_D0C 0x01
33#define AB3100_D1C 0x02
34#define AB3100_D2C 0x03
35#define AB3100_D3C 0x04
36
37/* Chip ID register */
38#define AB3100_CID 0x20
39
40/* AB3100 interrupt registers */
41#define AB3100_IMRA1 0x24
42#define AB3100_IMRA2 0x25
43#define AB3100_IMRA3 0x26
44#define AB3100_IMRB1 0x2B
45#define AB3100_IMRB2 0x2C
46#define AB3100_IMRB3 0x2D
47
48/* System Power Monitoring and control registers */
49#define AB3100_MCA 0x2E
50#define AB3100_MCB 0x2F
51
52/* SIM power up */
53#define AB3100_SUP 0x50
54
55/*
56 * I2C communication
57 *
58 * The AB3100 is usually assigned address 0x48 (7-bit)
59 * The chip is defined in the platform i2c_board_data section.
60 */
61static unsigned short normal_i2c[] = { 0x48, I2C_CLIENT_END };
62I2C_CLIENT_INSMOD_1(ab3100);
63
64u8 ab3100_get_chip_type(struct ab3100 *ab3100)
65{
66 u8 chip = ABUNKNOWN;
67
68 switch (ab3100->chip_id & 0xf0) {
69 case 0xa0:
70 chip = AB3000;
71 break;
72 case 0xc0:
73 chip = AB3100;
74 break;
75 }
76 return chip;
77}
78EXPORT_SYMBOL(ab3100_get_chip_type);
79
80int ab3100_set_register(struct ab3100 *ab3100, u8 reg, u8 regval)
81{
82 u8 regandval[2] = {reg, regval};
83 int err;
84
85 err = mutex_lock_interruptible(&ab3100->access_mutex);
86 if (err)
87 return err;
88
89 /*
90 * A two-byte write message with the first byte containing the register
91 * number and the second byte containing the value to be written
92 * effectively sets a register in the AB3100.
93 */
94 err = i2c_master_send(ab3100->i2c_client, regandval, 2);
95 if (err < 0) {
96 dev_err(ab3100->dev,
97 "write error (write register): %d\n",
98 err);
99 } else if (err != 2) {
100 dev_err(ab3100->dev,
101 "write error (write register) "
102 "%d bytes transferred (expected 2)\n",
103 err);
104 err = -EIO;
105 } else {
106 /* All is well */
107 err = 0;
108 }
109 mutex_unlock(&ab3100->access_mutex);
110 return 0;
111}
112EXPORT_SYMBOL(ab3100_set_register);
113
114/*
115 * The test registers exist at an I2C bus address up one
116 * from the ordinary base. They are not supposed to be used
117 * in production code, but sometimes you have to do that
118 * anyway. It's currently only used from this file so declare
119 * it static and do not export.
120 */
121static int ab3100_set_test_register(struct ab3100 *ab3100,
122 u8 reg, u8 regval)
123{
124 u8 regandval[2] = {reg, regval};
125 int err;
126
127 err = mutex_lock_interruptible(&ab3100->access_mutex);
128 if (err)
129 return err;
130
131 err = i2c_master_send(ab3100->testreg_client, regandval, 2);
132 if (err < 0) {
133 dev_err(ab3100->dev,
134 "write error (write test register): %d\n",
135 err);
136 } else if (err != 2) {
137 dev_err(ab3100->dev,
138 "write error (write test register) "
139 "%d bytes transferred (expected 2)\n",
140 err);
141 err = -EIO;
142 } else {
143 /* All is well */
144 err = 0;
145 }
146 mutex_unlock(&ab3100->access_mutex);
147
148 return err;
149}
150
151int ab3100_get_register(struct ab3100 *ab3100, u8 reg, u8 *regval)
152{
153 int err;
154
155 err = mutex_lock_interruptible(&ab3100->access_mutex);
156 if (err)
157 return err;
158
159 /*
160 * AB3100 require an I2C "stop" command between each message, else
161 * it will not work. The only way of achieveing this with the
162 * message transport layer is to send the read and write messages
163 * separately.
164 */
165 err = i2c_master_send(ab3100->i2c_client, &reg, 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}
205EXPORT_SYMBOL(ab3100_get_register);
206
207int ab3100_get_register_page(struct ab3100 *ab3100,
208 u8 first_reg, u8 *regvals, u8 numregs)
209{
210 int err;
211
212 if (ab3100->chip_id == 0xa0 ||
213 ab3100->chip_id == 0xa1)
214 /* These don't support paged reads */
215 return -EIO;
216
217 err = mutex_lock_interruptible(&ab3100->access_mutex);
218 if (err)
219 return err;
220
221 /*
222 * Paged read also require an I2C "stop" command.
223 */
224 err = i2c_master_send(ab3100->i2c_client, &first_reg, 1);
225 if (err < 0) {
226 dev_err(ab3100->dev,
227 "write error (send first register address): %d\n",
228 err);
229 goto get_reg_page_out_unlock;
230 } else if (err != 1) {
231 dev_err(ab3100->dev,
232 "write error (send first register address) "
233 "%d bytes transferred (expected 1)\n",
234 err);
235 err = -EIO;
236 goto get_reg_page_out_unlock;
237 }
238
239 err = i2c_master_recv(ab3100->i2c_client, regvals, numregs);
240 if (err < 0) {
241 dev_err(ab3100->dev,
242 "write error (read register page): %d\n",
243 err);
244 goto get_reg_page_out_unlock;
245 } else if (err != numregs) {
246 dev_err(ab3100->dev,
247 "write error (read register page) "
248 "%d bytes transferred (expected %d)\n",
249 err, numregs);
250 err = -EIO;
251 goto get_reg_page_out_unlock;
252 }
253
254 /* All is well */
255 err = 0;
256
257 get_reg_page_out_unlock:
258 mutex_unlock(&ab3100->access_mutex);
259 return err;
260}
261EXPORT_SYMBOL(ab3100_get_register_page);
262
263int ab3100_mask_and_set_register(struct ab3100 *ab3100,
264 u8 reg, u8 andmask, u8 ormask)
265{
266 u8 regandval[2] = {reg, 0};
267 int err;
268
269 err = mutex_lock_interruptible(&ab3100->access_mutex);
270 if (err)
271 return err;
272
273 /* First read out the target register */
274 err = i2c_master_send(ab3100->i2c_client, &reg, 1);
275 if (err < 0) {
276 dev_err(ab3100->dev,
277 "write error (maskset send address): %d\n",
278 err);
279 goto get_maskset_unlock;
280 } else if (err != 1) {
281 dev_err(ab3100->dev,
282 "write error (maskset send address) "
283 "%d bytes transferred (expected 1)\n",
284 err);
285 err = -EIO;
286 goto get_maskset_unlock;
287 }
288
289 err = i2c_master_recv(ab3100->i2c_client, &regandval[1], 1);
290 if (err < 0) {
291 dev_err(ab3100->dev,
292 "write error (maskset read register): %d\n",
293 err);
294 goto get_maskset_unlock;
295 } else if (err != 1) {
296 dev_err(ab3100->dev,
297 "write error (maskset read register) "
298 "%d bytes transferred (expected 1)\n",
299 err);
300 err = -EIO;
301 goto get_maskset_unlock;
302 }
303
304 /* Modify the register */
305 regandval[1] &= andmask;
306 regandval[1] |= ormask;
307
308 /* Write the register */
309 err = i2c_master_send(ab3100->i2c_client, regandval, 2);
310 if (err < 0) {
311 dev_err(ab3100->dev,
312 "write error (write register): %d\n",
313 err);
314 goto get_maskset_unlock;
315 } else if (err != 2) {
316 dev_err(ab3100->dev,
317 "write error (write register) "
318 "%d bytes transferred (expected 2)\n",
319 err);
320 err = -EIO;
321 goto get_maskset_unlock;
322 }
323
324 /* All is well */
325 err = 0;
326
327 get_maskset_unlock:
328 mutex_unlock(&ab3100->access_mutex);
329 return err;
330}
331EXPORT_SYMBOL(ab3100_mask_and_set_register);
332
333/*
334 * Register a simple callback for handling any AB3100 events.
335 */
336int ab3100_event_register(struct ab3100 *ab3100,
337 struct notifier_block *nb)
338{
339 return blocking_notifier_chain_register(&ab3100->event_subscribers,
340 nb);
341}
342EXPORT_SYMBOL(ab3100_event_register);
343
344/*
345 * Remove a previously registered callback.
346 */
347int ab3100_event_unregister(struct ab3100 *ab3100,
348 struct notifier_block *nb)
349{
350 return blocking_notifier_chain_unregister(&ab3100->event_subscribers,
351 nb);
352}
353EXPORT_SYMBOL(ab3100_event_unregister);
354
355
356int ab3100_event_registers_startup_state_get(struct ab3100 *ab3100,
357 u32 *fatevent)
358{
359 if (!ab3100->startup_events_read)
360 return -EAGAIN; /* Try again later */
361 *fatevent = ab3100->startup_events;
362 return 0;
363}
364EXPORT_SYMBOL(ab3100_event_registers_startup_state_get);
365
366/* Interrupt handling worker */
367static void ab3100_work(struct work_struct *work)
368{
369 struct ab3100 *ab3100 = container_of(work, struct ab3100, work);
370 u8 event_regs[3];
371 u32 fatevent;
372 int err;
373
374 err = ab3100_get_register_page(ab3100, AB3100_EVENTA1,
375 event_regs, 3);
376 if (err)
377 goto err_event_wq;
378
379 fatevent = (event_regs[0] << 16) |
380 (event_regs[1] << 8) |
381 event_regs[2];
382
383 if (!ab3100->startup_events_read) {
384 ab3100->startup_events = fatevent;
385 ab3100->startup_events_read = true;
386 }
387 /*
388 * The notified parties will have to mask out the events
389 * they're interested in and react to them. They will be
390 * notified on all events, then they use the fatevent value
391 * to determine if they're interested.
392 */
393 blocking_notifier_call_chain(&ab3100->event_subscribers,
394 fatevent, NULL);
395
396 dev_dbg(ab3100->dev,
397 "IRQ Event: 0x%08x\n", fatevent);
398
399 /* By now the IRQ should be acked and deasserted so enable it again */
400 enable_irq(ab3100->i2c_client->irq);
401 return;
402
403 err_event_wq:
404 dev_dbg(ab3100->dev,
405 "error in event workqueue\n");
406 /* Enable the IRQ anyway, what choice do we have? */
407 enable_irq(ab3100->i2c_client->irq);
408 return;
409}
410
411static irqreturn_t ab3100_irq_handler(int irq, void *data)
412{
413 struct ab3100 *ab3100 = data;
414 /*
415 * Disable the IRQ and dispatch a worker to handle the
416 * event. Since the chip resides on I2C this is slow
417 * stuff and we will re-enable the interrupts once th
418 * worker has finished.
419 */
420 disable_irq(ab3100->i2c_client->irq);
421 schedule_work(&ab3100->work);
422 return IRQ_HANDLED;
423}
424
425#ifdef CONFIG_DEBUG_FS
426/*
427 * Some debugfs entries only exposed if we're using debug
428 */
429static int ab3100_registers_print(struct seq_file *s, void *p)
430{
431 struct ab3100 *ab3100 = s->private;
432 u8 value;
433 u8 reg;
434
435 seq_printf(s, "AB3100 registers:\n");
436
437 for (reg = 0; reg < 0xff; reg++) {
438 ab3100_get_register(ab3100, reg, &value);
439 seq_printf(s, "[0x%x]: 0x%x\n", reg, value);
440 }
441 return 0;
442}
443
444static int ab3100_registers_open(struct inode *inode, struct file *file)
445{
446 return single_open(file, ab3100_registers_print, inode->i_private);
447}
448
449static const struct file_operations ab3100_registers_fops = {
450 .open = ab3100_registers_open,
451 .read = seq_read,
452 .llseek = seq_lseek,
453 .release = single_release,
454 .owner = THIS_MODULE,
455};
456
457struct ab3100_get_set_reg_priv {
458 struct ab3100 *ab3100;
459 bool mode;
460};
461
462static int ab3100_get_set_reg_open_file(struct inode *inode, struct file *file)
463{
464 file->private_data = inode->i_private;
465 return 0;
466}
467
468static int ab3100_get_set_reg(struct file *file,
469 const char __user *user_buf,
470 size_t count, loff_t *ppos)
471{
472 struct ab3100_get_set_reg_priv *priv = file->private_data;
473 struct ab3100 *ab3100 = priv->ab3100;
474 char buf[32];
475 int buf_size;
476 int regp;
477 unsigned long user_reg;
478 int err;
479 int i = 0;
480
481 /* Get userspace string and assure termination */
482 buf_size = min(count, (sizeof(buf)-1));
483 if (copy_from_user(buf, user_buf, buf_size))
484 return -EFAULT;
485 buf[buf_size] = 0;
486
487 /*
488 * The idea is here to parse a string which is either
489 * "0xnn" for reading a register, or "0xaa 0xbb" for
490 * writing 0xbb to the register 0xaa. First move past
491 * whitespace and then begin to parse the register.
492 */
493 while ((i < buf_size) && (buf[i] == ' '))
494 i++;
495 regp = i;
496
497 /*
498 * Advance pointer to end of string then terminate
499 * the register string. This is needed to satisfy
500 * the strict_strtoul() function.
501 */
502 while ((i < buf_size) && (buf[i] != ' '))
503 i++;
504 buf[i] = '\0';
505
506 err = strict_strtoul(&buf[regp], 16, &user_reg);
507 if (err)
508 return err;
509 if (user_reg > 0xff)
510 return -EINVAL;
511
512 /* Either we read or we write a register here */
513 if (!priv->mode) {
514 /* Reading */
515 u8 reg = (u8) user_reg;
516 u8 regvalue;
517
518 ab3100_get_register(ab3100, reg, &regvalue);
519
520 dev_info(ab3100->dev,
521 "debug read AB3100 reg[0x%02x]: 0x%02x\n",
522 reg, regvalue);
523 } else {
524 int valp;
525 unsigned long user_value;
526 u8 reg = (u8) user_reg;
527 u8 value;
528 u8 regvalue;
529
530 /*
531 * Writing, we need some value to write to
532 * the register so keep parsing the string
533 * from userspace.
534 */
535 i++;
536 while ((i < buf_size) && (buf[i] == ' '))
537 i++;
538 valp = i;
539 while ((i < buf_size) && (buf[i] != ' '))
540 i++;
541 buf[i] = '\0';
542
543 err = strict_strtoul(&buf[valp], 16, &user_value);
544 if (err)
545 return err;
546 if (user_reg > 0xff)
547 return -EINVAL;
548
549 value = (u8) user_value;
550 ab3100_set_register(ab3100, reg, value);
551 ab3100_get_register(ab3100, reg, &regvalue);
552
553 dev_info(ab3100->dev,
554 "debug write reg[0x%02x] with 0x%02x, "
555 "after readback: 0x%02x\n",
556 reg, value, regvalue);
557 }
558 return buf_size;
559}
560
561static const struct file_operations ab3100_get_set_reg_fops = {
562 .open = ab3100_get_set_reg_open_file,
563 .write = ab3100_get_set_reg,
564};
565
566static struct dentry *ab3100_dir;
567static struct dentry *ab3100_reg_file;
568static struct ab3100_get_set_reg_priv ab3100_get_priv;
569static struct dentry *ab3100_get_reg_file;
570static struct ab3100_get_set_reg_priv ab3100_set_priv;
571static struct dentry *ab3100_set_reg_file;
572
573static void ab3100_setup_debugfs(struct ab3100 *ab3100)
574{
575 int err;
576
577 ab3100_dir = debugfs_create_dir("ab3100", NULL);
578 if (!ab3100_dir)
579 goto exit_no_debugfs;
580
581 ab3100_reg_file = debugfs_create_file("registers",
582 S_IRUGO, ab3100_dir, ab3100,
583 &ab3100_registers_fops);
584 if (!ab3100_reg_file) {
585 err = -ENOMEM;
586 goto exit_destroy_dir;
587 }
588
589 ab3100_get_priv.ab3100 = ab3100;
590 ab3100_get_priv.mode = false;
591 ab3100_get_reg_file = debugfs_create_file("get_reg",
592 S_IWUGO, ab3100_dir, &ab3100_get_priv,
593 &ab3100_get_set_reg_fops);
594 if (!ab3100_get_reg_file) {
595 err = -ENOMEM;
596 goto exit_destroy_reg;
597 }
598
599 ab3100_set_priv.ab3100 = ab3100;
600 ab3100_set_priv.mode = true;
601 ab3100_set_reg_file = debugfs_create_file("set_reg",
602 S_IWUGO, ab3100_dir, &ab3100_set_priv,
603 &ab3100_get_set_reg_fops);
604 if (!ab3100_set_reg_file) {
605 err = -ENOMEM;
606 goto exit_destroy_get_reg;
607 }
608 return;
609
610 exit_destroy_get_reg:
611 debugfs_remove(ab3100_get_reg_file);
612 exit_destroy_reg:
613 debugfs_remove(ab3100_reg_file);
614 exit_destroy_dir:
615 debugfs_remove(ab3100_dir);
616 exit_no_debugfs:
617 return;
618}
619static inline void ab3100_remove_debugfs(void)
620{
621 debugfs_remove(ab3100_set_reg_file);
622 debugfs_remove(ab3100_get_reg_file);
623 debugfs_remove(ab3100_reg_file);
624 debugfs_remove(ab3100_dir);
625}
626#else
627static inline void ab3100_setup_debugfs(struct ab3100 *ab3100)
628{
629}
630static inline void ab3100_remove_debugfs(void)
631{
632}
633#endif
634
635/*
636 * Basic set-up, datastructure creation/destruction and I2C interface.
637 * This sets up a default config in the AB3100 chip so that it
638 * will work as expected.
639 */
640
641struct ab3100_init_setting {
642 u8 abreg;
643 u8 setting;
644};
645
646static const struct ab3100_init_setting __initdata
647ab3100_init_settings[] = {
648 {
649 .abreg = AB3100_MCA,
650 .setting = 0x01
651 }, {
652 .abreg = AB3100_MCB,
653 .setting = 0x30
654 }, {
655 .abreg = AB3100_IMRA1,
656 .setting = 0x00
657 }, {
658 .abreg = AB3100_IMRA2,
659 .setting = 0xFF
660 }, {
661 .abreg = AB3100_IMRA3,
662 .setting = 0x01
663 }, {
664 .abreg = AB3100_IMRB1,
665 .setting = 0xFF
666 }, {
667 .abreg = AB3100_IMRB2,
668 .setting = 0xFF
669 }, {
670 .abreg = AB3100_IMRB3,
671 .setting = 0xFF
672 }, {
673 .abreg = AB3100_SUP,
674 .setting = 0x00
675 }, {
676 .abreg = AB3100_DIS,
677 .setting = 0xF0
678 }, {
679 .abreg = AB3100_D0C,
680 .setting = 0x00
681 }, {
682 .abreg = AB3100_D1C,
683 .setting = 0x00
684 }, {
685 .abreg = AB3100_D2C,
686 .setting = 0x00
687 }, {
688 .abreg = AB3100_D3C,
689 .setting = 0x00
690 },
691};
692
693static int __init ab3100_setup(struct ab3100 *ab3100)
694{
695 int err = 0;
696 int i;
697
698 for (i = 0; i < ARRAY_SIZE(ab3100_init_settings); i++) {
699 err = ab3100_set_register(ab3100,
700 ab3100_init_settings[i].abreg,
701 ab3100_init_settings[i].setting);
702 if (err)
703 goto exit_no_setup;
704 }
705
706 /*
707 * Special trick to make the AB3100 use the 32kHz clock (RTC)
708 * bit 3 in test registe 0x02 is a special, undocumented test
709 * register bit that only exist in AB3100 P1E
710 */
711 if (ab3100->chip_id == 0xc4) {
712 dev_warn(ab3100->dev,
713 "AB3100 P1E variant detected, "
714 "forcing chip to 32KHz\n");
715 err = ab3100_set_test_register(ab3100, 0x02, 0x08);
716 }
717
718 exit_no_setup:
719 return err;
720}
721
722/*
723 * Here we define all the platform devices that appear
724 * as children of the AB3100. These are regular platform
725 * devices with the IORESOURCE_IO .start and .end set
726 * to correspond to the internal AB3100 register range
727 * mapping to the corresponding subdevice.
728 */
729
730#define AB3100_DEVICE(devname, devid) \
731static struct platform_device ab3100_##devname##_device = { \
732 .name = devid, \
733 .id = -1, \
734}
735
736/*
737 * This lists all the subdevices and corresponding register
738 * ranges.
739 */
740AB3100_DEVICE(dac, "ab3100-dac");
741AB3100_DEVICE(leds, "ab3100-leds");
742AB3100_DEVICE(power, "ab3100-power");
743AB3100_DEVICE(regulators, "ab3100-regulators");
744AB3100_DEVICE(sim, "ab3100-sim");
745AB3100_DEVICE(uart, "ab3100-uart");
746AB3100_DEVICE(rtc, "ab3100-rtc");
747AB3100_DEVICE(charger, "ab3100-charger");
748AB3100_DEVICE(boost, "ab3100-boost");
749AB3100_DEVICE(adc, "ab3100-adc");
750AB3100_DEVICE(fuelgauge, "ab3100-fuelgauge");
751AB3100_DEVICE(vibrator, "ab3100-vibrator");
752AB3100_DEVICE(otp, "ab3100-otp");
753AB3100_DEVICE(codec, "ab3100-codec");
754
755static struct platform_device *
756ab3100_platform_devs[] = {
757 &ab3100_dac_device,
758 &ab3100_leds_device,
759 &ab3100_power_device,
760 &ab3100_regulators_device,
761 &ab3100_sim_device,
762 &ab3100_uart_device,
763 &ab3100_rtc_device,
764 &ab3100_charger_device,
765 &ab3100_boost_device,
766 &ab3100_adc_device,
767 &ab3100_fuelgauge_device,
768 &ab3100_vibrator_device,
769 &ab3100_otp_device,
770 &ab3100_codec_device,
771};
772
773struct ab_family_id {
774 u8 id;
775 char *name;
776};
777
778static const struct ab_family_id ids[] __initdata = {
779 /* AB3100 */
780 {
781 .id = 0xc0,
782 .name = "P1A"
783 }, {
784 .id = 0xc1,
785 .name = "P1B"
786 }, {
787 .id = 0xc2,
788 .name = "P1C"
789 }, {
790 .id = 0xc3,
791 .name = "P1D"
792 }, {
793 .id = 0xc4,
794 .name = "P1E"
795 }, {
796 .id = 0xc5,
797 .name = "P1F/R1A"
798 }, {
799 .id = 0xc6,
800 .name = "P1G/R1A"
801 }, {
802 .id = 0xc7,
803 .name = "P2A/R2A"
804 }, {
805 .id = 0xc8,
806 .name = "P2B/R2B"
807 },
808 /* AB3000 variants, not supported */
809 {
810 .id = 0xa0
811 }, {
812 .id = 0xa1
813 }, {
814 .id = 0xa2
815 }, {
816 .id = 0xa3
817 }, {
818 .id = 0xa4
819 }, {
820 .id = 0xa5
821 }, {
822 .id = 0xa6
823 }, {
824 .id = 0xa7
825 },
826 /* Terminator */
827 {
828 .id = 0x00,
829 },
830};
831
832static int __init ab3100_probe(struct i2c_client *client,
833 const struct i2c_device_id *id)
834{
835 struct ab3100 *ab3100;
836 int err;
837 int i;
838
839 ab3100 = kzalloc(sizeof(struct ab3100), GFP_KERNEL);
840 if (!ab3100) {
841 dev_err(&client->dev, "could not allocate AB3100 device\n");
842 return -ENOMEM;
843 }
844
845 /* Initialize data structure */
846 mutex_init(&ab3100->access_mutex);
847 BLOCKING_INIT_NOTIFIER_HEAD(&ab3100->event_subscribers);
848
849 ab3100->i2c_client = client;
850 ab3100->dev = &ab3100->i2c_client->dev;
851
852 i2c_set_clientdata(client, ab3100);
853
854 /* Read chip ID register */
855 err = ab3100_get_register(ab3100, AB3100_CID,
856 &ab3100->chip_id);
857 if (err) {
858 dev_err(&client->dev,
859 "could not communicate with the AB3100 analog "
860 "baseband chip\n");
861 goto exit_no_detect;
862 }
863
864 for (i = 0; ids[i].id != 0x0; i++) {
865 if (ids[i].id == ab3100->chip_id) {
866 if (ids[i].name != NULL) {
867 snprintf(&ab3100->chip_name[0],
868 sizeof(ab3100->chip_name) - 1,
869 "AB3100 %s",
870 ids[i].name);
871 break;
872 } else {
873 dev_err(&client->dev,
874 "AB3000 is not supported\n");
875 goto exit_no_detect;
876 }
877 }
878 }
879
880 if (ids[i].id == 0x0) {
881 dev_err(&client->dev, "unknown analog baseband chip id: 0x%x\n",
882 ab3100->chip_id);
883 dev_err(&client->dev, "accepting it anyway. Please update "
884 "the driver.\n");
885 goto exit_no_detect;
886 }
887
888 dev_info(&client->dev, "Detected chip: %s\n",
889 &ab3100->chip_name[0]);
890
891 /* Attach a second dummy i2c_client to the test register address */
892 ab3100->testreg_client = i2c_new_dummy(client->adapter,
893 client->addr + 1);
894 if (!ab3100->testreg_client) {
895 err = -ENOMEM;
896 goto exit_no_testreg_client;
897 }
898
899 strlcpy(ab3100->testreg_client->name, id->name,
900 sizeof(ab3100->testreg_client->name));
901
902 err = ab3100_setup(ab3100);
903 if (err)
904 goto exit_no_setup;
905
906 INIT_WORK(&ab3100->work, ab3100_work);
907
908 /* This real unpredictable IRQ is of course sampled for entropy */
909 err = request_irq(client->irq, ab3100_irq_handler,
910 IRQF_DISABLED | IRQF_SAMPLE_RANDOM,
911 "AB3100 IRQ", ab3100);
912 if (err)
913 goto exit_no_irq;
914
915 /* Set parent and a pointer back to the container in device data */
916 for (i = 0; i < ARRAY_SIZE(ab3100_platform_devs); i++) {
917 ab3100_platform_devs[i]->dev.parent =
918 &client->dev;
919 platform_set_drvdata(ab3100_platform_devs[i], ab3100);
920 }
921
922 /* Register the platform devices */
923 platform_add_devices(ab3100_platform_devs,
924 ARRAY_SIZE(ab3100_platform_devs));
925
926 ab3100_setup_debugfs(ab3100);
927
928 return 0;
929
930 exit_no_irq:
931 exit_no_setup:
932 i2c_unregister_device(ab3100->testreg_client);
933 exit_no_testreg_client:
934 exit_no_detect:
935 kfree(ab3100);
936 return err;
937}
938
939static int __exit ab3100_remove(struct i2c_client *client)
940{
941 struct ab3100 *ab3100 = i2c_get_clientdata(client);
942 int i;
943
944 /* Unregister subdevices */
945 for (i = 0; i < ARRAY_SIZE(ab3100_platform_devs); i++)
946 platform_device_unregister(ab3100_platform_devs[i]);
947
948 ab3100_remove_debugfs();
949 i2c_unregister_device(ab3100->testreg_client);
950
951 /*
952 * At this point, all subscribers should have unregistered
953 * their notifiers so deactivate IRQ
954 */
955 free_irq(client->irq, ab3100);
956 kfree(ab3100);
957 return 0;
958}
959
960static const struct i2c_device_id ab3100_id[] = {
961 { "ab3100", ab3100 },
962 { }
963};
964MODULE_DEVICE_TABLE(i2c, ab3100_id);
965
966static struct i2c_driver ab3100_driver = {
967 .driver = {
968 .name = "ab3100",
969 .owner = THIS_MODULE,
970 },
971 .id_table = ab3100_id,
972 .probe = ab3100_probe,
973 .remove = __exit_p(ab3100_remove),
974};
975
976static int __init ab3100_i2c_init(void)
977{
978 return i2c_add_driver(&ab3100_driver);
979}
980
981static void __exit ab3100_i2c_exit(void)
982{
983 i2c_del_driver(&ab3100_driver);
984}
985
986subsys_initcall(ab3100_i2c_init);
987module_exit(ab3100_i2c_exit);
988
989MODULE_AUTHOR("Linus Walleij <linus.walleij@stericsson.com>");
990MODULE_DESCRIPTION("AB3100 core driver");
991MODULE_LICENSE("GPL");
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-28 05:20:26 -0500