1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * Copyright (C) 2007-2010 ST-Ericsson
 
  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/slab.h>
 14#include <linux/err.h>
 15#include <linux/init.h>
 16#include <linux/platform_device.h>
 17#include <linux/device.h>
 18#include <linux/interrupt.h>
 19#include <linux/random.h>
 20#include <linux/debugfs.h>
 21#include <linux/seq_file.h>
 22#include <linux/uaccess.h>
 23#include <linux/mfd/core.h>
 24#include <linux/mfd/ab3100.h>
 25#include <linux/mfd/abx500.h>
 26
 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 */
 65static int ab3100_get_chip_id(struct device *dev)
 66{
 67	struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
 68
 69	return (int)ab3100->chip_id;
 70}
 71
 72static int ab3100_set_register_interruptible(struct ab3100 *ab3100,
 73	u8 reg, u8 regval)
 74{
 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,
 94			"write error (write register)\n"
 95			"  %d bytes transferred (expected 2)\n",
 96			err);
 97		err = -EIO;
 98	} else {
 99		/* All is well */
100		err = 0;
101	}
102	mutex_unlock(&ab3100->access_mutex);
103	return err;
104}
105
106static 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}
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_interruptible(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)\n"
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
151static int ab3100_get_register_interruptible(struct ab3100 *ab3100,
152					     u8 reg, u8 *regval)
153{
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,
174			"write error (send register address)\n"
175			"  %d bytes transferred (expected 1)\n",
176			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,
192			"write error (read register)\n"
193			"  %d bytes transferred (expected 1)\n",
194			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}
206
207static int get_register_interruptible(struct device *dev, u8 bank, u8 reg,
208				      u8 *value)
209{
210	struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
211
212	return ab3100_get_register_interruptible(ab3100, reg, value);
213}
214
215static int ab3100_get_register_page_interruptible(struct ab3100 *ab3100,
216			     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,
240			"write error (send first register address)\n"
241			"  %d bytes transferred (expected 1)\n",
242			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,
255			"write error (read register page)\n"
256			"  %d bytes transferred (expected %d)\n",
257			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}
269
270static 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);
274
275	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,
280				 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,
298			"write error (maskset send address)\n"
299			"  %d bytes transferred (expected 1)\n",
300			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,
313			"write error (maskset read register)\n"
314			"  %d bytes transferred (expected 1)\n",
315			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,
333			"write error (write register)\n"
334			"  %d bytes transferred (expected 2)\n",
335			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}
347
348static 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}
356
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{
374	return blocking_notifier_chain_unregister(&ab3100->event_subscribers,
375					    nb);
376}
377EXPORT_SYMBOL(ab3100_event_unregister);
378
379
380static int ab3100_event_registers_startup_state_get(struct device *dev,
381					     u8 *event)
382{
383	struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
384
385	if (!ab3100->startup_events_read)
386		return -EAGAIN; /* Try again later */
387	memcpy(event, ab3100->startup_events, 3);
388
389	return 0;
390}
391
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};
403
404/*
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)
409{
410	struct ab3100 *ab3100 = data;
411	u8 event_regs[3];
412	u32 fatevent;
413	int err;
414
415	err = ab3100_get_register_page_interruptible(ab3100, AB3100_EVENTA1,
416				       event_regs, 3);
417	if (err)
418		goto err_event;
419
420	fatevent = (event_regs[0] << 16) |
421		(event_regs[1] << 8) |
422		event_regs[2];
423
424	if (!ab3100->startup_events_read) {
425		ab3100->startup_events[0] = event_regs[0];
426		ab3100->startup_events[1] = event_regs[1];
427		ab3100->startup_events[2] = event_regs[2];
428		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
442	return IRQ_HANDLED;
443
444 err_event:
445	dev_dbg(ab3100->dev,
446		"error reading event status\n");
447	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
460	seq_puts(s, "AB3100 registers:\n");
461
462	for (reg = 0; reg < 0xff; reg++) {
463		ab3100_get_register_interruptible(ab3100, reg, &value);
464		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
487static ssize_t ab3100_get_set_reg(struct file *file,
488				  const char __user *user_buf,
489				  size_t count, loff_t *ppos)
490{
491	struct ab3100_get_set_reg_priv *priv = file->private_data;
492	struct ab3100 *ab3100 = priv->ab3100;
493	char buf[32];
494	ssize_t buf_size;
495	int regp;
496	u8 user_reg;
497	int err;
498	int i = 0;
499
500	/* Get userspace string and assure termination */
501	buf_size = min((ssize_t)count, (ssize_t)(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
519	 * the kstrtou8() function.
520	 */
521	while ((i < buf_size) && (buf[i] != ' '))
522		i++;
523	buf[i] = '\0';
524
525	err = kstrtou8(&buf[regp], 16, &user_reg);
526	if (err)
527		return err;
528
529	/* Either we read or we write a register here */
530	if (!priv->mode) {
531		/* Reading */
532		u8 regvalue;
533
534		ab3100_get_register_interruptible(ab3100, user_reg, &regvalue);
535
536		dev_info(ab3100->dev,
537			 "debug read AB3100 reg[0x%02x]: 0x%02x\n",
538			 user_reg, regvalue);
539	} else {
540		int valp;
541		u8 user_value;
542		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
557		err = kstrtou8(&buf[valp], 16, &user_value);
558		if (err)
559			return err;
560
561		ab3100_set_register_interruptible(ab3100, user_reg, user_value);
562		ab3100_get_register_interruptible(ab3100, user_reg, &regvalue);
563
564		dev_info(ab3100->dev,
565			 "debug write reg[0x%02x]\n"
566			 "  with 0x%02x, after readback: 0x%02x\n",
567			 user_reg, user_value, regvalue);
568	}
569	return buf_size;
570}
571
572static const struct file_operations ab3100_get_set_reg_fops = {
573	.open = simple_open,
574	.write = ab3100_get_set_reg,
575	.llseek = noop_llseek,
576};
577
 
 
578static struct ab3100_get_set_reg_priv ab3100_get_priv;
 
579static struct ab3100_get_set_reg_priv ab3100_set_priv;
 
580
581static void ab3100_setup_debugfs(struct ab3100 *ab3100)
582{
583	struct dentry *ab3100_dir;
584
585	ab3100_dir = debugfs_create_dir("ab3100", NULL);
 
 
586
587	debugfs_create_file("registers", S_IRUGO, ab3100_dir, ab3100,
588			    &ab3100_registers_fops);
 
 
 
 
 
589
590	ab3100_get_priv.ab3100 = ab3100;
591	ab3100_get_priv.mode = false;
592	debugfs_create_file("get_reg", S_IWUSR, ab3100_dir, &ab3100_get_priv,
593			    &ab3100_get_set_reg_fops);
 
 
 
 
 
594
595	ab3100_set_priv.ab3100 = ab3100;
596	ab3100_set_priv.mode = true;
597	debugfs_create_file("set_reg", S_IWUSR, ab3100_dir, &ab3100_set_priv,
598			    &ab3100_get_set_reg_fops);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
599}
600#else
601static inline void ab3100_setup_debugfs(struct ab3100 *ab3100)
602{
603}
 
 
 
604#endif
605
606/*
607 * Basic set-up, datastructure creation/destruction and I2C interface.
608 * This sets up a default config in the AB3100 chip so that it
609 * will work as expected.
610 */
611
612struct ab3100_init_setting {
613	u8 abreg;
614	u8 setting;
615};
616
617static const struct ab3100_init_setting ab3100_init_settings[] = {
618	{
619		.abreg = AB3100_MCA,
620		.setting = 0x01
621	}, {
622		.abreg = AB3100_MCB,
623		.setting = 0x30
624	}, {
625		.abreg = AB3100_IMRA1,
626		.setting = 0x00
627	}, {
628		.abreg = AB3100_IMRA2,
629		.setting = 0xFF
630	}, {
631		.abreg = AB3100_IMRA3,
632		.setting = 0x01
633	}, {
634		.abreg = AB3100_IMRB1,
635		.setting = 0xBF
636	}, {
637		.abreg = AB3100_IMRB2,
638		.setting = 0xFF
639	}, {
640		.abreg = AB3100_IMRB3,
641		.setting = 0xFF
642	}, {
643		.abreg = AB3100_SUP,
644		.setting = 0x00
645	}, {
646		.abreg = AB3100_DIS,
647		.setting = 0xF0
648	}, {
649		.abreg = AB3100_D0C,
650		.setting = 0x00
651	}, {
652		.abreg = AB3100_D1C,
653		.setting = 0x00
654	}, {
655		.abreg = AB3100_D2C,
656		.setting = 0x00
657	}, {
658		.abreg = AB3100_D3C,
659		.setting = 0x00
660	},
661};
662
663static int ab3100_setup(struct ab3100 *ab3100)
664{
665	int err = 0;
666	int i;
667
668	for (i = 0; i < ARRAY_SIZE(ab3100_init_settings); i++) {
669		err = ab3100_set_register_interruptible(ab3100,
670					  ab3100_init_settings[i].abreg,
671					  ab3100_init_settings[i].setting);
672		if (err)
673			goto exit_no_setup;
674	}
675
676	/*
677	 * Special trick to make the AB3100 use the 32kHz clock (RTC)
678	 * bit 3 in test register 0x02 is a special, undocumented test
679	 * register bit that only exist in AB3100 P1E
680	 */
681	if (ab3100->chip_id == 0xc4) {
682		dev_warn(ab3100->dev,
683			 "AB3100 P1E variant detected forcing chip to 32KHz\n");
 
684		err = ab3100_set_test_register_interruptible(ab3100,
685			0x02, 0x08);
686	}
687
688 exit_no_setup:
689	return err;
690}
691
692/* The subdevices of the AB3100 */
693static struct mfd_cell ab3100_devs[] = {
694	{
695		.name = "ab3100-dac",
696		.id = -1,
697	},
698	{
699		.name = "ab3100-leds",
700		.id = -1,
701	},
702	{
703		.name = "ab3100-power",
704		.id = -1,
705	},
706	{
707		.name = "ab3100-regulators",
708		.of_compatible = "stericsson,ab3100-regulators",
709		.id = -1,
710	},
711	{
712		.name = "ab3100-sim",
713		.id = -1,
714	},
715	{
716		.name = "ab3100-uart",
717		.id = -1,
718	},
719	{
720		.name = "ab3100-rtc",
721		.id = -1,
722	},
723	{
724		.name = "ab3100-charger",
725		.id = -1,
726	},
727	{
728		.name = "ab3100-boost",
729		.id = -1,
730	},
731	{
732		.name = "ab3100-adc",
733		.id = -1,
734	},
735	{
736		.name = "ab3100-fuelgauge",
737		.id = -1,
738	},
739	{
740		.name = "ab3100-vibrator",
741		.id = -1,
742	},
743	{
744		.name = "ab3100-otp",
745		.id = -1,
746	},
747	{
748		.name = "ab3100-codec",
749		.id = -1,
750	},
751};
752
753struct ab_family_id {
754	u8	id;
755	char	*name;
756};
757
758static const struct ab_family_id ids[] = {
759	/* AB3100 */
760	{
761		.id = 0xc0,
762		.name = "P1A"
763	}, {
764		.id = 0xc1,
765		.name = "P1B"
766	}, {
767		.id = 0xc2,
768		.name = "P1C"
769	}, {
770		.id = 0xc3,
771		.name = "P1D"
772	}, {
773		.id = 0xc4,
774		.name = "P1E"
775	}, {
776		.id = 0xc5,
777		.name = "P1F/R1A"
778	}, {
779		.id = 0xc6,
780		.name = "P1G/R1A"
781	}, {
782		.id = 0xc7,
783		.name = "P2A/R2A"
784	}, {
785		.id = 0xc8,
786		.name = "P2B/R2B"
787	},
788	/* AB3000 variants, not supported */
789	{
790		.id = 0xa0
791	}, {
792		.id = 0xa1
793	}, {
794		.id = 0xa2
795	}, {
796		.id = 0xa3
797	}, {
798		.id = 0xa4
799	}, {
800		.id = 0xa5
801	}, {
802		.id = 0xa6
803	}, {
804		.id = 0xa7
805	},
806	/* Terminator */
807	{
808		.id = 0x00,
809	},
810};
811
812static int ab3100_probe(struct i2c_client *client,
813				  const struct i2c_device_id *id)
814{
815	struct ab3100 *ab3100;
816	struct ab3100_platform_data *ab3100_plf_data =
817		dev_get_platdata(&client->dev);
818	int err;
819	int i;
820
821	ab3100 = devm_kzalloc(&client->dev, sizeof(struct ab3100), GFP_KERNEL);
822	if (!ab3100)
 
823		return -ENOMEM;
 
824
825	/* Initialize data structure */
826	mutex_init(&ab3100->access_mutex);
827	BLOCKING_INIT_NOTIFIER_HEAD(&ab3100->event_subscribers);
828
829	ab3100->i2c_client = client;
830	ab3100->dev = &ab3100->i2c_client->dev;
831
832	i2c_set_clientdata(client, ab3100);
833
834	/* Read chip ID register */
835	err = ab3100_get_register_interruptible(ab3100, AB3100_CID,
836						&ab3100->chip_id);
837	if (err) {
838		dev_err(&client->dev,
839			"failed to communicate with AB3100 chip\n");
 
840		goto exit_no_detect;
841	}
842
843	for (i = 0; ids[i].id != 0x0; i++) {
844		if (ids[i].id == ab3100->chip_id) {
845			if (ids[i].name)
 
 
 
 
846				break;
847
848			dev_err(&client->dev, "AB3000 is not supported\n");
849			goto exit_no_detect;
 
 
850		}
851	}
852
853	snprintf(&ab3100->chip_name[0],
854		 sizeof(ab3100->chip_name) - 1, "AB3100 %s", ids[i].name);
855
856	if (ids[i].id == 0x0) {
857		dev_err(&client->dev, "unknown analog baseband chip id: 0x%x\n",
858			ab3100->chip_id);
859		dev_err(&client->dev,
860			"accepting it anyway. Please update the driver.\n");
861		goto exit_no_detect;
862	}
863
864	dev_info(&client->dev, "Detected chip: %s\n",
865		 &ab3100->chip_name[0]);
866
867	/* Attach a second dummy i2c_client to the test register address */
868	ab3100->testreg_client = i2c_new_dummy_device(client->adapter,
869					       client->addr + 1);
870	if (IS_ERR(ab3100->testreg_client)) {
871		err = PTR_ERR(ab3100->testreg_client);
872		goto exit_no_testreg_client;
873	}
874
875	err = ab3100_setup(ab3100);
876	if (err)
877		goto exit_no_setup;
878
879	err = devm_request_threaded_irq(&client->dev,
880					client->irq, NULL, ab3100_irq_handler,
881					IRQF_ONESHOT, "ab3100-core", ab3100);
882	if (err)
883		goto exit_no_irq;
884
885	err = abx500_register_ops(&client->dev, &ab3100_ops);
886	if (err)
887		goto exit_no_ops;
888
889	/* Set up and register the platform devices. */
890	for (i = 0; i < ARRAY_SIZE(ab3100_devs); i++) {
891		ab3100_devs[i].platform_data = ab3100_plf_data;
892		ab3100_devs[i].pdata_size = sizeof(struct ab3100_platform_data);
893	}
894
895	err = mfd_add_devices(&client->dev, 0, ab3100_devs,
896			      ARRAY_SIZE(ab3100_devs), NULL, 0, NULL);
897
898	ab3100_setup_debugfs(ab3100);
899
900	return 0;
901
902 exit_no_ops:
903 exit_no_irq:
904 exit_no_setup:
905	i2c_unregister_device(ab3100->testreg_client);
906 exit_no_testreg_client:
907 exit_no_detect:
908	return err;
909}
910
 
 
 
 
 
 
 
 
 
 
 
911static const struct i2c_device_id ab3100_id[] = {
912	{ "ab3100", 0 },
913	{ }
914};
 
915
916static struct i2c_driver ab3100_driver = {
917	.driver = {
918		.name			= "ab3100",
919		.suppress_bind_attrs	= true,
920	},
921	.id_table	= ab3100_id,
922	.probe		= ab3100_probe,
 
923};
924
925static int __init ab3100_i2c_init(void)
926{
927	return i2c_add_driver(&ab3100_driver);
928}
 
 
 
 
 
 
929subsys_initcall(ab3100_i2c_init);