2 * Register map access API
4 * Copyright 2011 Wolfson Microelectronics plc
6 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
13 #include <linux/device.h>
14 #include <linux/slab.h>
15 #include <linux/export.h>
16 #include <linux/mutex.h>
17 #include <linux/err.h>
19 #include <linux/rbtree.h>
20 #include <linux/sched.h>
21 #include <linux/delay.h>
23 #define CREATE_TRACE_POINTS
29 * Sometimes for failures during very early init the trace
30 * infrastructure isn't available early enough to be used. For this
31 * sort of problem defining LOG_DEVICE will add printks for basic
32 * register I/O on a specific device.
36 static int _regmap_update_bits(struct regmap
*map
, unsigned int reg
,
37 unsigned int mask
, unsigned int val
,
38 bool *change
, bool force_write
);
40 static int _regmap_bus_reg_read(void *context
, unsigned int reg
,
42 static int _regmap_bus_read(void *context
, unsigned int reg
,
44 static int _regmap_bus_formatted_write(void *context
, unsigned int reg
,
46 static int _regmap_bus_reg_write(void *context
, unsigned int reg
,
48 static int _regmap_bus_raw_write(void *context
, unsigned int reg
,
51 bool regmap_reg_in_ranges(unsigned int reg
,
52 const struct regmap_range
*ranges
,
55 const struct regmap_range
*r
;
58 for (i
= 0, r
= ranges
; i
< nranges
; i
++, r
++)
59 if (regmap_reg_in_range(reg
, r
))
63 EXPORT_SYMBOL_GPL(regmap_reg_in_ranges
);
65 bool regmap_check_range_table(struct regmap
*map
, unsigned int reg
,
66 const struct regmap_access_table
*table
)
68 /* Check "no ranges" first */
69 if (regmap_reg_in_ranges(reg
, table
->no_ranges
, table
->n_no_ranges
))
72 /* In case zero "yes ranges" are supplied, any reg is OK */
73 if (!table
->n_yes_ranges
)
76 return regmap_reg_in_ranges(reg
, table
->yes_ranges
,
79 EXPORT_SYMBOL_GPL(regmap_check_range_table
);
81 bool regmap_writeable(struct regmap
*map
, unsigned int reg
)
83 if (map
->max_register
&& reg
> map
->max_register
)
86 if (map
->writeable_reg
)
87 return map
->writeable_reg(map
->dev
, reg
);
90 return regmap_check_range_table(map
, reg
, map
->wr_table
);
95 bool regmap_readable(struct regmap
*map
, unsigned int reg
)
100 if (map
->max_register
&& reg
> map
->max_register
)
103 if (map
->format
.format_write
)
106 if (map
->readable_reg
)
107 return map
->readable_reg(map
->dev
, reg
);
110 return regmap_check_range_table(map
, reg
, map
->rd_table
);
115 bool regmap_volatile(struct regmap
*map
, unsigned int reg
)
117 if (!map
->format
.format_write
&& !regmap_readable(map
, reg
))
120 if (map
->volatile_reg
)
121 return map
->volatile_reg(map
->dev
, reg
);
123 if (map
->volatile_table
)
124 return regmap_check_range_table(map
, reg
, map
->volatile_table
);
132 bool regmap_precious(struct regmap
*map
, unsigned int reg
)
134 if (!regmap_readable(map
, reg
))
137 if (map
->precious_reg
)
138 return map
->precious_reg(map
->dev
, reg
);
140 if (map
->precious_table
)
141 return regmap_check_range_table(map
, reg
, map
->precious_table
);
146 static bool regmap_volatile_range(struct regmap
*map
, unsigned int reg
,
151 for (i
= 0; i
< num
; i
++)
152 if (!regmap_volatile(map
, reg
+ i
))
158 static void regmap_format_2_6_write(struct regmap
*map
,
159 unsigned int reg
, unsigned int val
)
161 u8
*out
= map
->work_buf
;
163 *out
= (reg
<< 6) | val
;
166 static void regmap_format_4_12_write(struct regmap
*map
,
167 unsigned int reg
, unsigned int val
)
169 __be16
*out
= map
->work_buf
;
170 *out
= cpu_to_be16((reg
<< 12) | val
);
173 static void regmap_format_7_9_write(struct regmap
*map
,
174 unsigned int reg
, unsigned int val
)
176 __be16
*out
= map
->work_buf
;
177 *out
= cpu_to_be16((reg
<< 9) | val
);
180 static void regmap_format_10_14_write(struct regmap
*map
,
181 unsigned int reg
, unsigned int val
)
183 u8
*out
= map
->work_buf
;
186 out
[1] = (val
>> 8) | (reg
<< 6);
190 static void regmap_format_8(void *buf
, unsigned int val
, unsigned int shift
)
197 static void regmap_format_16_be(void *buf
, unsigned int val
, unsigned int shift
)
201 b
[0] = cpu_to_be16(val
<< shift
);
204 static void regmap_format_16_le(void *buf
, unsigned int val
, unsigned int shift
)
208 b
[0] = cpu_to_le16(val
<< shift
);
211 static void regmap_format_16_native(void *buf
, unsigned int val
,
214 *(u16
*)buf
= val
<< shift
;
217 static void regmap_format_24(void *buf
, unsigned int val
, unsigned int shift
)
228 static void regmap_format_32_be(void *buf
, unsigned int val
, unsigned int shift
)
232 b
[0] = cpu_to_be32(val
<< shift
);
235 static void regmap_format_32_le(void *buf
, unsigned int val
, unsigned int shift
)
239 b
[0] = cpu_to_le32(val
<< shift
);
242 static void regmap_format_32_native(void *buf
, unsigned int val
,
245 *(u32
*)buf
= val
<< shift
;
249 static void regmap_format_64_be(void *buf
, unsigned int val
, unsigned int shift
)
253 b
[0] = cpu_to_be64((u64
)val
<< shift
);
256 static void regmap_format_64_le(void *buf
, unsigned int val
, unsigned int shift
)
260 b
[0] = cpu_to_le64((u64
)val
<< shift
);
263 static void regmap_format_64_native(void *buf
, unsigned int val
,
266 *(u64
*)buf
= (u64
)val
<< shift
;
270 static void regmap_parse_inplace_noop(void *buf
)
274 static unsigned int regmap_parse_8(const void *buf
)
281 static unsigned int regmap_parse_16_be(const void *buf
)
283 const __be16
*b
= buf
;
285 return be16_to_cpu(b
[0]);
288 static unsigned int regmap_parse_16_le(const void *buf
)
290 const __le16
*b
= buf
;
292 return le16_to_cpu(b
[0]);
295 static void regmap_parse_16_be_inplace(void *buf
)
299 b
[0] = be16_to_cpu(b
[0]);
302 static void regmap_parse_16_le_inplace(void *buf
)
306 b
[0] = le16_to_cpu(b
[0]);
309 static unsigned int regmap_parse_16_native(const void *buf
)
314 static unsigned int regmap_parse_24(const void *buf
)
317 unsigned int ret
= b
[2];
318 ret
|= ((unsigned int)b
[1]) << 8;
319 ret
|= ((unsigned int)b
[0]) << 16;
324 static unsigned int regmap_parse_32_be(const void *buf
)
326 const __be32
*b
= buf
;
328 return be32_to_cpu(b
[0]);
331 static unsigned int regmap_parse_32_le(const void *buf
)
333 const __le32
*b
= buf
;
335 return le32_to_cpu(b
[0]);
338 static void regmap_parse_32_be_inplace(void *buf
)
342 b
[0] = be32_to_cpu(b
[0]);
345 static void regmap_parse_32_le_inplace(void *buf
)
349 b
[0] = le32_to_cpu(b
[0]);
352 static unsigned int regmap_parse_32_native(const void *buf
)
358 static unsigned int regmap_parse_64_be(const void *buf
)
360 const __be64
*b
= buf
;
362 return be64_to_cpu(b
[0]);
365 static unsigned int regmap_parse_64_le(const void *buf
)
367 const __le64
*b
= buf
;
369 return le64_to_cpu(b
[0]);
372 static void regmap_parse_64_be_inplace(void *buf
)
376 b
[0] = be64_to_cpu(b
[0]);
379 static void regmap_parse_64_le_inplace(void *buf
)
383 b
[0] = le64_to_cpu(b
[0]);
386 static unsigned int regmap_parse_64_native(const void *buf
)
392 static void regmap_lock_mutex(void *__map
)
394 struct regmap
*map
= __map
;
395 mutex_lock(&map
->mutex
);
398 static void regmap_unlock_mutex(void *__map
)
400 struct regmap
*map
= __map
;
401 mutex_unlock(&map
->mutex
);
404 static void regmap_lock_spinlock(void *__map
)
405 __acquires(&map
->spinlock
)
407 struct regmap
*map
= __map
;
410 spin_lock_irqsave(&map
->spinlock
, flags
);
411 map
->spinlock_flags
= flags
;
414 static void regmap_unlock_spinlock(void *__map
)
415 __releases(&map
->spinlock
)
417 struct regmap
*map
= __map
;
418 spin_unlock_irqrestore(&map
->spinlock
, map
->spinlock_flags
);
421 static void dev_get_regmap_release(struct device
*dev
, void *res
)
424 * We don't actually have anything to do here; the goal here
425 * is not to manage the regmap but to provide a simple way to
426 * get the regmap back given a struct device.
430 static bool _regmap_range_add(struct regmap
*map
,
431 struct regmap_range_node
*data
)
433 struct rb_root
*root
= &map
->range_tree
;
434 struct rb_node
**new = &(root
->rb_node
), *parent
= NULL
;
437 struct regmap_range_node
*this =
438 container_of(*new, struct regmap_range_node
, node
);
441 if (data
->range_max
< this->range_min
)
442 new = &((*new)->rb_left
);
443 else if (data
->range_min
> this->range_max
)
444 new = &((*new)->rb_right
);
449 rb_link_node(&data
->node
, parent
, new);
450 rb_insert_color(&data
->node
, root
);
455 static struct regmap_range_node
*_regmap_range_lookup(struct regmap
*map
,
458 struct rb_node
*node
= map
->range_tree
.rb_node
;
461 struct regmap_range_node
*this =
462 container_of(node
, struct regmap_range_node
, node
);
464 if (reg
< this->range_min
)
465 node
= node
->rb_left
;
466 else if (reg
> this->range_max
)
467 node
= node
->rb_right
;
475 static void regmap_range_exit(struct regmap
*map
)
477 struct rb_node
*next
;
478 struct regmap_range_node
*range_node
;
480 next
= rb_first(&map
->range_tree
);
482 range_node
= rb_entry(next
, struct regmap_range_node
, node
);
483 next
= rb_next(&range_node
->node
);
484 rb_erase(&range_node
->node
, &map
->range_tree
);
488 kfree(map
->selector_work_buf
);
491 int regmap_attach_dev(struct device
*dev
, struct regmap
*map
,
492 const struct regmap_config
*config
)
498 regmap_debugfs_init(map
, config
->name
);
500 /* Add a devres resource for dev_get_regmap() */
501 m
= devres_alloc(dev_get_regmap_release
, sizeof(*m
), GFP_KERNEL
);
503 regmap_debugfs_exit(map
);
511 EXPORT_SYMBOL_GPL(regmap_attach_dev
);
513 static enum regmap_endian
regmap_get_reg_endian(const struct regmap_bus
*bus
,
514 const struct regmap_config
*config
)
516 enum regmap_endian endian
;
518 /* Retrieve the endianness specification from the regmap config */
519 endian
= config
->reg_format_endian
;
521 /* If the regmap config specified a non-default value, use that */
522 if (endian
!= REGMAP_ENDIAN_DEFAULT
)
525 /* Retrieve the endianness specification from the bus config */
526 if (bus
&& bus
->reg_format_endian_default
)
527 endian
= bus
->reg_format_endian_default
;
529 /* If the bus specified a non-default value, use that */
530 if (endian
!= REGMAP_ENDIAN_DEFAULT
)
533 /* Use this if no other value was found */
534 return REGMAP_ENDIAN_BIG
;
537 enum regmap_endian
regmap_get_val_endian(struct device
*dev
,
538 const struct regmap_bus
*bus
,
539 const struct regmap_config
*config
)
541 struct device_node
*np
;
542 enum regmap_endian endian
;
544 /* Retrieve the endianness specification from the regmap config */
545 endian
= config
->val_format_endian
;
547 /* If the regmap config specified a non-default value, use that */
548 if (endian
!= REGMAP_ENDIAN_DEFAULT
)
551 /* If the dev and dev->of_node exist try to get endianness from DT */
552 if (dev
&& dev
->of_node
) {
555 /* Parse the device's DT node for an endianness specification */
556 if (of_property_read_bool(np
, "big-endian"))
557 endian
= REGMAP_ENDIAN_BIG
;
558 else if (of_property_read_bool(np
, "little-endian"))
559 endian
= REGMAP_ENDIAN_LITTLE
;
560 else if (of_property_read_bool(np
, "native-endian"))
561 endian
= REGMAP_ENDIAN_NATIVE
;
563 /* If the endianness was specified in DT, use that */
564 if (endian
!= REGMAP_ENDIAN_DEFAULT
)
568 /* Retrieve the endianness specification from the bus config */
569 if (bus
&& bus
->val_format_endian_default
)
570 endian
= bus
->val_format_endian_default
;
572 /* If the bus specified a non-default value, use that */
573 if (endian
!= REGMAP_ENDIAN_DEFAULT
)
576 /* Use this if no other value was found */
577 return REGMAP_ENDIAN_BIG
;
579 EXPORT_SYMBOL_GPL(regmap_get_val_endian
);
581 struct regmap
*__regmap_init(struct device
*dev
,
582 const struct regmap_bus
*bus
,
584 const struct regmap_config
*config
,
585 struct lock_class_key
*lock_key
,
586 const char *lock_name
)
590 enum regmap_endian reg_endian
, val_endian
;
596 map
= kzalloc(sizeof(*map
), GFP_KERNEL
);
602 if (config
->lock
&& config
->unlock
) {
603 map
->lock
= config
->lock
;
604 map
->unlock
= config
->unlock
;
605 map
->lock_arg
= config
->lock_arg
;
607 if ((bus
&& bus
->fast_io
) ||
609 spin_lock_init(&map
->spinlock
);
610 map
->lock
= regmap_lock_spinlock
;
611 map
->unlock
= regmap_unlock_spinlock
;
612 lockdep_set_class_and_name(&map
->spinlock
,
613 lock_key
, lock_name
);
615 mutex_init(&map
->mutex
);
616 map
->lock
= regmap_lock_mutex
;
617 map
->unlock
= regmap_unlock_mutex
;
618 lockdep_set_class_and_name(&map
->mutex
,
619 lock_key
, lock_name
);
625 * When we write in fast-paths with regmap_bulk_write() don't allocate
626 * scratch buffers with sleeping allocations.
628 if ((bus
&& bus
->fast_io
) || config
->fast_io
)
629 map
->alloc_flags
= GFP_ATOMIC
;
631 map
->alloc_flags
= GFP_KERNEL
;
633 map
->format
.reg_bytes
= DIV_ROUND_UP(config
->reg_bits
, 8);
634 map
->format
.pad_bytes
= config
->pad_bits
/ 8;
635 map
->format
.val_bytes
= DIV_ROUND_UP(config
->val_bits
, 8);
636 map
->format
.buf_size
= DIV_ROUND_UP(config
->reg_bits
+
637 config
->val_bits
+ config
->pad_bits
, 8);
638 map
->reg_shift
= config
->pad_bits
% 8;
639 if (config
->reg_stride
)
640 map
->reg_stride
= config
->reg_stride
;
643 map
->use_single_read
= config
->use_single_rw
|| !bus
|| !bus
->read
;
644 map
->use_single_write
= config
->use_single_rw
|| !bus
|| !bus
->write
;
645 map
->can_multi_write
= config
->can_multi_write
&& bus
&& bus
->write
;
647 map
->max_raw_read
= bus
->max_raw_read
;
648 map
->max_raw_write
= bus
->max_raw_write
;
652 map
->bus_context
= bus_context
;
653 map
->max_register
= config
->max_register
;
654 map
->wr_table
= config
->wr_table
;
655 map
->rd_table
= config
->rd_table
;
656 map
->volatile_table
= config
->volatile_table
;
657 map
->precious_table
= config
->precious_table
;
658 map
->writeable_reg
= config
->writeable_reg
;
659 map
->readable_reg
= config
->readable_reg
;
660 map
->volatile_reg
= config
->volatile_reg
;
661 map
->precious_reg
= config
->precious_reg
;
662 map
->cache_type
= config
->cache_type
;
663 map
->name
= config
->name
;
665 spin_lock_init(&map
->async_lock
);
666 INIT_LIST_HEAD(&map
->async_list
);
667 INIT_LIST_HEAD(&map
->async_free
);
668 init_waitqueue_head(&map
->async_waitq
);
670 if (config
->read_flag_mask
|| config
->write_flag_mask
) {
671 map
->read_flag_mask
= config
->read_flag_mask
;
672 map
->write_flag_mask
= config
->write_flag_mask
;
674 map
->read_flag_mask
= bus
->read_flag_mask
;
678 map
->reg_read
= config
->reg_read
;
679 map
->reg_write
= config
->reg_write
;
681 map
->defer_caching
= false;
682 goto skip_format_initialization
;
683 } else if (!bus
->read
|| !bus
->write
) {
684 map
->reg_read
= _regmap_bus_reg_read
;
685 map
->reg_write
= _regmap_bus_reg_write
;
687 map
->defer_caching
= false;
688 goto skip_format_initialization
;
690 map
->reg_read
= _regmap_bus_read
;
691 map
->reg_update_bits
= bus
->reg_update_bits
;
694 reg_endian
= regmap_get_reg_endian(bus
, config
);
695 val_endian
= regmap_get_val_endian(dev
, bus
, config
);
697 switch (config
->reg_bits
+ map
->reg_shift
) {
699 switch (config
->val_bits
) {
701 map
->format
.format_write
= regmap_format_2_6_write
;
709 switch (config
->val_bits
) {
711 map
->format
.format_write
= regmap_format_4_12_write
;
719 switch (config
->val_bits
) {
721 map
->format
.format_write
= regmap_format_7_9_write
;
729 switch (config
->val_bits
) {
731 map
->format
.format_write
= regmap_format_10_14_write
;
739 map
->format
.format_reg
= regmap_format_8
;
743 switch (reg_endian
) {
744 case REGMAP_ENDIAN_BIG
:
745 map
->format
.format_reg
= regmap_format_16_be
;
747 case REGMAP_ENDIAN_NATIVE
:
748 map
->format
.format_reg
= regmap_format_16_native
;
756 if (reg_endian
!= REGMAP_ENDIAN_BIG
)
758 map
->format
.format_reg
= regmap_format_24
;
762 switch (reg_endian
) {
763 case REGMAP_ENDIAN_BIG
:
764 map
->format
.format_reg
= regmap_format_32_be
;
766 case REGMAP_ENDIAN_NATIVE
:
767 map
->format
.format_reg
= regmap_format_32_native
;
776 switch (reg_endian
) {
777 case REGMAP_ENDIAN_BIG
:
778 map
->format
.format_reg
= regmap_format_64_be
;
780 case REGMAP_ENDIAN_NATIVE
:
781 map
->format
.format_reg
= regmap_format_64_native
;
793 if (val_endian
== REGMAP_ENDIAN_NATIVE
)
794 map
->format
.parse_inplace
= regmap_parse_inplace_noop
;
796 switch (config
->val_bits
) {
798 map
->format
.format_val
= regmap_format_8
;
799 map
->format
.parse_val
= regmap_parse_8
;
800 map
->format
.parse_inplace
= regmap_parse_inplace_noop
;
803 switch (val_endian
) {
804 case REGMAP_ENDIAN_BIG
:
805 map
->format
.format_val
= regmap_format_16_be
;
806 map
->format
.parse_val
= regmap_parse_16_be
;
807 map
->format
.parse_inplace
= regmap_parse_16_be_inplace
;
809 case REGMAP_ENDIAN_LITTLE
:
810 map
->format
.format_val
= regmap_format_16_le
;
811 map
->format
.parse_val
= regmap_parse_16_le
;
812 map
->format
.parse_inplace
= regmap_parse_16_le_inplace
;
814 case REGMAP_ENDIAN_NATIVE
:
815 map
->format
.format_val
= regmap_format_16_native
;
816 map
->format
.parse_val
= regmap_parse_16_native
;
823 if (val_endian
!= REGMAP_ENDIAN_BIG
)
825 map
->format
.format_val
= regmap_format_24
;
826 map
->format
.parse_val
= regmap_parse_24
;
829 switch (val_endian
) {
830 case REGMAP_ENDIAN_BIG
:
831 map
->format
.format_val
= regmap_format_32_be
;
832 map
->format
.parse_val
= regmap_parse_32_be
;
833 map
->format
.parse_inplace
= regmap_parse_32_be_inplace
;
835 case REGMAP_ENDIAN_LITTLE
:
836 map
->format
.format_val
= regmap_format_32_le
;
837 map
->format
.parse_val
= regmap_parse_32_le
;
838 map
->format
.parse_inplace
= regmap_parse_32_le_inplace
;
840 case REGMAP_ENDIAN_NATIVE
:
841 map
->format
.format_val
= regmap_format_32_native
;
842 map
->format
.parse_val
= regmap_parse_32_native
;
850 switch (val_endian
) {
851 case REGMAP_ENDIAN_BIG
:
852 map
->format
.format_val
= regmap_format_64_be
;
853 map
->format
.parse_val
= regmap_parse_64_be
;
854 map
->format
.parse_inplace
= regmap_parse_64_be_inplace
;
856 case REGMAP_ENDIAN_LITTLE
:
857 map
->format
.format_val
= regmap_format_64_le
;
858 map
->format
.parse_val
= regmap_parse_64_le
;
859 map
->format
.parse_inplace
= regmap_parse_64_le_inplace
;
861 case REGMAP_ENDIAN_NATIVE
:
862 map
->format
.format_val
= regmap_format_64_native
;
863 map
->format
.parse_val
= regmap_parse_64_native
;
872 if (map
->format
.format_write
) {
873 if ((reg_endian
!= REGMAP_ENDIAN_BIG
) ||
874 (val_endian
!= REGMAP_ENDIAN_BIG
))
876 map
->use_single_write
= true;
879 if (!map
->format
.format_write
&&
880 !(map
->format
.format_reg
&& map
->format
.format_val
))
883 map
->work_buf
= kzalloc(map
->format
.buf_size
, GFP_KERNEL
);
884 if (map
->work_buf
== NULL
) {
889 if (map
->format
.format_write
) {
890 map
->defer_caching
= false;
891 map
->reg_write
= _regmap_bus_formatted_write
;
892 } else if (map
->format
.format_val
) {
893 map
->defer_caching
= true;
894 map
->reg_write
= _regmap_bus_raw_write
;
897 skip_format_initialization
:
899 map
->range_tree
= RB_ROOT
;
900 for (i
= 0; i
< config
->num_ranges
; i
++) {
901 const struct regmap_range_cfg
*range_cfg
= &config
->ranges
[i
];
902 struct regmap_range_node
*new;
905 if (range_cfg
->range_max
< range_cfg
->range_min
) {
906 dev_err(map
->dev
, "Invalid range %d: %d < %d\n", i
,
907 range_cfg
->range_max
, range_cfg
->range_min
);
911 if (range_cfg
->range_max
> map
->max_register
) {
912 dev_err(map
->dev
, "Invalid range %d: %d > %d\n", i
,
913 range_cfg
->range_max
, map
->max_register
);
917 if (range_cfg
->selector_reg
> map
->max_register
) {
919 "Invalid range %d: selector out of map\n", i
);
923 if (range_cfg
->window_len
== 0) {
924 dev_err(map
->dev
, "Invalid range %d: window_len 0\n",
929 /* Make sure, that this register range has no selector
930 or data window within its boundary */
931 for (j
= 0; j
< config
->num_ranges
; j
++) {
932 unsigned sel_reg
= config
->ranges
[j
].selector_reg
;
933 unsigned win_min
= config
->ranges
[j
].window_start
;
934 unsigned win_max
= win_min
+
935 config
->ranges
[j
].window_len
- 1;
937 /* Allow data window inside its own virtual range */
941 if (range_cfg
->range_min
<= sel_reg
&&
942 sel_reg
<= range_cfg
->range_max
) {
944 "Range %d: selector for %d in window\n",
949 if (!(win_max
< range_cfg
->range_min
||
950 win_min
> range_cfg
->range_max
)) {
952 "Range %d: window for %d in window\n",
958 new = kzalloc(sizeof(*new), GFP_KERNEL
);
965 new->name
= range_cfg
->name
;
966 new->range_min
= range_cfg
->range_min
;
967 new->range_max
= range_cfg
->range_max
;
968 new->selector_reg
= range_cfg
->selector_reg
;
969 new->selector_mask
= range_cfg
->selector_mask
;
970 new->selector_shift
= range_cfg
->selector_shift
;
971 new->window_start
= range_cfg
->window_start
;
972 new->window_len
= range_cfg
->window_len
;
974 if (!_regmap_range_add(map
, new)) {
975 dev_err(map
->dev
, "Failed to add range %d\n", i
);
980 if (map
->selector_work_buf
== NULL
) {
981 map
->selector_work_buf
=
982 kzalloc(map
->format
.buf_size
, GFP_KERNEL
);
983 if (map
->selector_work_buf
== NULL
) {
990 ret
= regcache_init(map
, config
);
995 ret
= regmap_attach_dev(dev
, map
, config
);
1005 regmap_range_exit(map
);
1006 kfree(map
->work_buf
);
1010 return ERR_PTR(ret
);
1012 EXPORT_SYMBOL_GPL(__regmap_init
);
1014 static void devm_regmap_release(struct device
*dev
, void *res
)
1016 regmap_exit(*(struct regmap
**)res
);
1019 struct regmap
*__devm_regmap_init(struct device
*dev
,
1020 const struct regmap_bus
*bus
,
1022 const struct regmap_config
*config
,
1023 struct lock_class_key
*lock_key
,
1024 const char *lock_name
)
1026 struct regmap
**ptr
, *regmap
;
1028 ptr
= devres_alloc(devm_regmap_release
, sizeof(*ptr
), GFP_KERNEL
);
1030 return ERR_PTR(-ENOMEM
);
1032 regmap
= __regmap_init(dev
, bus
, bus_context
, config
,
1033 lock_key
, lock_name
);
1034 if (!IS_ERR(regmap
)) {
1036 devres_add(dev
, ptr
);
1043 EXPORT_SYMBOL_GPL(__devm_regmap_init
);
1045 static void regmap_field_init(struct regmap_field
*rm_field
,
1046 struct regmap
*regmap
, struct reg_field reg_field
)
1048 rm_field
->regmap
= regmap
;
1049 rm_field
->reg
= reg_field
.reg
;
1050 rm_field
->shift
= reg_field
.lsb
;
1051 rm_field
->mask
= GENMASK(reg_field
.msb
, reg_field
.lsb
);
1052 rm_field
->id_size
= reg_field
.id_size
;
1053 rm_field
->id_offset
= reg_field
.id_offset
;
1057 * devm_regmap_field_alloc(): Allocate and initialise a register field
1058 * in a register map.
1060 * @dev: Device that will be interacted with
1061 * @regmap: regmap bank in which this register field is located.
1062 * @reg_field: Register field with in the bank.
1064 * The return value will be an ERR_PTR() on error or a valid pointer
1065 * to a struct regmap_field. The regmap_field will be automatically freed
1066 * by the device management code.
1068 struct regmap_field
*devm_regmap_field_alloc(struct device
*dev
,
1069 struct regmap
*regmap
, struct reg_field reg_field
)
1071 struct regmap_field
*rm_field
= devm_kzalloc(dev
,
1072 sizeof(*rm_field
), GFP_KERNEL
);
1074 return ERR_PTR(-ENOMEM
);
1076 regmap_field_init(rm_field
, regmap
, reg_field
);
1081 EXPORT_SYMBOL_GPL(devm_regmap_field_alloc
);
1084 * devm_regmap_field_free(): Free register field allocated using
1085 * devm_regmap_field_alloc. Usally drivers need not call this function,
1086 * as the memory allocated via devm will be freed as per device-driver
1089 * @dev: Device that will be interacted with
1090 * @field: regmap field which should be freed.
1092 void devm_regmap_field_free(struct device
*dev
,
1093 struct regmap_field
*field
)
1095 devm_kfree(dev
, field
);
1097 EXPORT_SYMBOL_GPL(devm_regmap_field_free
);
1100 * regmap_field_alloc(): Allocate and initialise a register field
1101 * in a register map.
1103 * @regmap: regmap bank in which this register field is located.
1104 * @reg_field: Register field with in the bank.
1106 * The return value will be an ERR_PTR() on error or a valid pointer
1107 * to a struct regmap_field. The regmap_field should be freed by the
1108 * user once its finished working with it using regmap_field_free().
1110 struct regmap_field
*regmap_field_alloc(struct regmap
*regmap
,
1111 struct reg_field reg_field
)
1113 struct regmap_field
*rm_field
= kzalloc(sizeof(*rm_field
), GFP_KERNEL
);
1116 return ERR_PTR(-ENOMEM
);
1118 regmap_field_init(rm_field
, regmap
, reg_field
);
1122 EXPORT_SYMBOL_GPL(regmap_field_alloc
);
1125 * regmap_field_free(): Free register field allocated using regmap_field_alloc
1127 * @field: regmap field which should be freed.
1129 void regmap_field_free(struct regmap_field
*field
)
1133 EXPORT_SYMBOL_GPL(regmap_field_free
);
1136 * regmap_reinit_cache(): Reinitialise the current register cache
1138 * @map: Register map to operate on.
1139 * @config: New configuration. Only the cache data will be used.
1141 * Discard any existing register cache for the map and initialize a
1142 * new cache. This can be used to restore the cache to defaults or to
1143 * update the cache configuration to reflect runtime discovery of the
1146 * No explicit locking is done here, the user needs to ensure that
1147 * this function will not race with other calls to regmap.
1149 int regmap_reinit_cache(struct regmap
*map
, const struct regmap_config
*config
)
1152 regmap_debugfs_exit(map
);
1154 map
->max_register
= config
->max_register
;
1155 map
->writeable_reg
= config
->writeable_reg
;
1156 map
->readable_reg
= config
->readable_reg
;
1157 map
->volatile_reg
= config
->volatile_reg
;
1158 map
->precious_reg
= config
->precious_reg
;
1159 map
->cache_type
= config
->cache_type
;
1161 regmap_debugfs_init(map
, config
->name
);
1163 map
->cache_bypass
= false;
1164 map
->cache_only
= false;
1166 return regcache_init(map
, config
);
1168 EXPORT_SYMBOL_GPL(regmap_reinit_cache
);
1171 * regmap_exit(): Free a previously allocated register map
1173 void regmap_exit(struct regmap
*map
)
1175 struct regmap_async
*async
;
1178 regmap_debugfs_exit(map
);
1179 regmap_range_exit(map
);
1180 if (map
->bus
&& map
->bus
->free_context
)
1181 map
->bus
->free_context(map
->bus_context
);
1182 kfree(map
->work_buf
);
1183 while (!list_empty(&map
->async_free
)) {
1184 async
= list_first_entry_or_null(&map
->async_free
,
1185 struct regmap_async
,
1187 list_del(&async
->list
);
1188 kfree(async
->work_buf
);
1193 EXPORT_SYMBOL_GPL(regmap_exit
);
1195 static int dev_get_regmap_match(struct device
*dev
, void *res
, void *data
)
1197 struct regmap
**r
= res
;
1203 /* If the user didn't specify a name match any */
1205 return (*r
)->name
== data
;
1211 * dev_get_regmap(): Obtain the regmap (if any) for a device
1213 * @dev: Device to retrieve the map for
1214 * @name: Optional name for the register map, usually NULL.
1216 * Returns the regmap for the device if one is present, or NULL. If
1217 * name is specified then it must match the name specified when
1218 * registering the device, if it is NULL then the first regmap found
1219 * will be used. Devices with multiple register maps are very rare,
1220 * generic code should normally not need to specify a name.
1222 struct regmap
*dev_get_regmap(struct device
*dev
, const char *name
)
1224 struct regmap
**r
= devres_find(dev
, dev_get_regmap_release
,
1225 dev_get_regmap_match
, (void *)name
);
1231 EXPORT_SYMBOL_GPL(dev_get_regmap
);
1234 * regmap_get_device(): Obtain the device from a regmap
1236 * @map: Register map to operate on.
1238 * Returns the underlying device that the regmap has been created for.
1240 struct device
*regmap_get_device(struct regmap
*map
)
1244 EXPORT_SYMBOL_GPL(regmap_get_device
);
1246 static int _regmap_select_page(struct regmap
*map
, unsigned int *reg
,
1247 struct regmap_range_node
*range
,
1248 unsigned int val_num
)
1250 void *orig_work_buf
;
1251 unsigned int win_offset
;
1252 unsigned int win_page
;
1256 win_offset
= (*reg
- range
->range_min
) % range
->window_len
;
1257 win_page
= (*reg
- range
->range_min
) / range
->window_len
;
1260 /* Bulk write shouldn't cross range boundary */
1261 if (*reg
+ val_num
- 1 > range
->range_max
)
1264 /* ... or single page boundary */
1265 if (val_num
> range
->window_len
- win_offset
)
1269 /* It is possible to have selector register inside data window.
1270 In that case, selector register is located on every page and
1271 it needs no page switching, when accessed alone. */
1273 range
->window_start
+ win_offset
!= range
->selector_reg
) {
1274 /* Use separate work_buf during page switching */
1275 orig_work_buf
= map
->work_buf
;
1276 map
->work_buf
= map
->selector_work_buf
;
1278 ret
= _regmap_update_bits(map
, range
->selector_reg
,
1279 range
->selector_mask
,
1280 win_page
<< range
->selector_shift
,
1283 map
->work_buf
= orig_work_buf
;
1289 *reg
= range
->window_start
+ win_offset
;
1294 int _regmap_raw_write(struct regmap
*map
, unsigned int reg
,
1295 const void *val
, size_t val_len
)
1297 struct regmap_range_node
*range
;
1298 unsigned long flags
;
1299 u8
*u8
= map
->work_buf
;
1300 void *work_val
= map
->work_buf
+ map
->format
.reg_bytes
+
1301 map
->format
.pad_bytes
;
1303 int ret
= -ENOTSUPP
;
1309 /* Check for unwritable registers before we start */
1310 if (map
->writeable_reg
)
1311 for (i
= 0; i
< val_len
/ map
->format
.val_bytes
; i
++)
1312 if (!map
->writeable_reg(map
->dev
,
1313 reg
+ (i
* map
->reg_stride
)))
1316 if (!map
->cache_bypass
&& map
->format
.parse_val
) {
1318 int val_bytes
= map
->format
.val_bytes
;
1319 for (i
= 0; i
< val_len
/ val_bytes
; i
++) {
1320 ival
= map
->format
.parse_val(val
+ (i
* val_bytes
));
1321 ret
= regcache_write(map
, reg
+ (i
* map
->reg_stride
),
1325 "Error in caching of register: %x ret: %d\n",
1330 if (map
->cache_only
) {
1331 map
->cache_dirty
= true;
1336 range
= _regmap_range_lookup(map
, reg
);
1338 int val_num
= val_len
/ map
->format
.val_bytes
;
1339 int win_offset
= (reg
- range
->range_min
) % range
->window_len
;
1340 int win_residue
= range
->window_len
- win_offset
;
1342 /* If the write goes beyond the end of the window split it */
1343 while (val_num
> win_residue
) {
1344 dev_dbg(map
->dev
, "Writing window %d/%zu\n",
1345 win_residue
, val_len
/ map
->format
.val_bytes
);
1346 ret
= _regmap_raw_write(map
, reg
, val
, win_residue
*
1347 map
->format
.val_bytes
);
1352 val_num
-= win_residue
;
1353 val
+= win_residue
* map
->format
.val_bytes
;
1354 val_len
-= win_residue
* map
->format
.val_bytes
;
1356 win_offset
= (reg
- range
->range_min
) %
1358 win_residue
= range
->window_len
- win_offset
;
1361 ret
= _regmap_select_page(map
, ®
, range
, val_num
);
1366 map
->format
.format_reg(map
->work_buf
, reg
, map
->reg_shift
);
1368 u8
[0] |= map
->write_flag_mask
;
1371 * Essentially all I/O mechanisms will be faster with a single
1372 * buffer to write. Since register syncs often generate raw
1373 * writes of single registers optimise that case.
1375 if (val
!= work_val
&& val_len
== map
->format
.val_bytes
) {
1376 memcpy(work_val
, val
, map
->format
.val_bytes
);
1380 if (map
->async
&& map
->bus
->async_write
) {
1381 struct regmap_async
*async
;
1383 trace_regmap_async_write_start(map
, reg
, val_len
);
1385 spin_lock_irqsave(&map
->async_lock
, flags
);
1386 async
= list_first_entry_or_null(&map
->async_free
,
1387 struct regmap_async
,
1390 list_del(&async
->list
);
1391 spin_unlock_irqrestore(&map
->async_lock
, flags
);
1394 async
= map
->bus
->async_alloc();
1398 async
->work_buf
= kzalloc(map
->format
.buf_size
,
1399 GFP_KERNEL
| GFP_DMA
);
1400 if (!async
->work_buf
) {
1408 /* If the caller supplied the value we can use it safely. */
1409 memcpy(async
->work_buf
, map
->work_buf
, map
->format
.pad_bytes
+
1410 map
->format
.reg_bytes
+ map
->format
.val_bytes
);
1412 spin_lock_irqsave(&map
->async_lock
, flags
);
1413 list_add_tail(&async
->list
, &map
->async_list
);
1414 spin_unlock_irqrestore(&map
->async_lock
, flags
);
1416 if (val
!= work_val
)
1417 ret
= map
->bus
->async_write(map
->bus_context
,
1419 map
->format
.reg_bytes
+
1420 map
->format
.pad_bytes
,
1421 val
, val_len
, async
);
1423 ret
= map
->bus
->async_write(map
->bus_context
,
1425 map
->format
.reg_bytes
+
1426 map
->format
.pad_bytes
+
1427 val_len
, NULL
, 0, async
);
1430 dev_err(map
->dev
, "Failed to schedule write: %d\n",
1433 spin_lock_irqsave(&map
->async_lock
, flags
);
1434 list_move(&async
->list
, &map
->async_free
);
1435 spin_unlock_irqrestore(&map
->async_lock
, flags
);
1441 trace_regmap_hw_write_start(map
, reg
, val_len
/ map
->format
.val_bytes
);
1443 /* If we're doing a single register write we can probably just
1444 * send the work_buf directly, otherwise try to do a gather
1447 if (val
== work_val
)
1448 ret
= map
->bus
->write(map
->bus_context
, map
->work_buf
,
1449 map
->format
.reg_bytes
+
1450 map
->format
.pad_bytes
+
1452 else if (map
->bus
->gather_write
)
1453 ret
= map
->bus
->gather_write(map
->bus_context
, map
->work_buf
,
1454 map
->format
.reg_bytes
+
1455 map
->format
.pad_bytes
,
1458 /* If that didn't work fall back on linearising by hand. */
1459 if (ret
== -ENOTSUPP
) {
1460 len
= map
->format
.reg_bytes
+ map
->format
.pad_bytes
+ val_len
;
1461 buf
= kzalloc(len
, GFP_KERNEL
);
1465 memcpy(buf
, map
->work_buf
, map
->format
.reg_bytes
);
1466 memcpy(buf
+ map
->format
.reg_bytes
+ map
->format
.pad_bytes
,
1468 ret
= map
->bus
->write(map
->bus_context
, buf
, len
);
1473 trace_regmap_hw_write_done(map
, reg
, val_len
/ map
->format
.val_bytes
);
1479 * regmap_can_raw_write - Test if regmap_raw_write() is supported
1481 * @map: Map to check.
1483 bool regmap_can_raw_write(struct regmap
*map
)
1485 return map
->bus
&& map
->bus
->write
&& map
->format
.format_val
&&
1486 map
->format
.format_reg
;
1488 EXPORT_SYMBOL_GPL(regmap_can_raw_write
);
1491 * regmap_get_raw_read_max - Get the maximum size we can read
1493 * @map: Map to check.
1495 size_t regmap_get_raw_read_max(struct regmap
*map
)
1497 return map
->max_raw_read
;
1499 EXPORT_SYMBOL_GPL(regmap_get_raw_read_max
);
1502 * regmap_get_raw_write_max - Get the maximum size we can read
1504 * @map: Map to check.
1506 size_t regmap_get_raw_write_max(struct regmap
*map
)
1508 return map
->max_raw_write
;
1510 EXPORT_SYMBOL_GPL(regmap_get_raw_write_max
);
1512 static int _regmap_bus_formatted_write(void *context
, unsigned int reg
,
1516 struct regmap_range_node
*range
;
1517 struct regmap
*map
= context
;
1519 WARN_ON(!map
->bus
|| !map
->format
.format_write
);
1521 range
= _regmap_range_lookup(map
, reg
);
1523 ret
= _regmap_select_page(map
, ®
, range
, 1);
1528 map
->format
.format_write(map
, reg
, val
);
1530 trace_regmap_hw_write_start(map
, reg
, 1);
1532 ret
= map
->bus
->write(map
->bus_context
, map
->work_buf
,
1533 map
->format
.buf_size
);
1535 trace_regmap_hw_write_done(map
, reg
, 1);
1540 static int _regmap_bus_reg_write(void *context
, unsigned int reg
,
1543 struct regmap
*map
= context
;
1545 return map
->bus
->reg_write(map
->bus_context
, reg
, val
);
1548 static int _regmap_bus_raw_write(void *context
, unsigned int reg
,
1551 struct regmap
*map
= context
;
1553 WARN_ON(!map
->bus
|| !map
->format
.format_val
);
1555 map
->format
.format_val(map
->work_buf
+ map
->format
.reg_bytes
1556 + map
->format
.pad_bytes
, val
, 0);
1557 return _regmap_raw_write(map
, reg
,
1559 map
->format
.reg_bytes
+
1560 map
->format
.pad_bytes
,
1561 map
->format
.val_bytes
);
1564 static inline void *_regmap_map_get_context(struct regmap
*map
)
1566 return (map
->bus
) ? map
: map
->bus_context
;
1569 int _regmap_write(struct regmap
*map
, unsigned int reg
,
1573 void *context
= _regmap_map_get_context(map
);
1575 if (!regmap_writeable(map
, reg
))
1578 if (!map
->cache_bypass
&& !map
->defer_caching
) {
1579 ret
= regcache_write(map
, reg
, val
);
1582 if (map
->cache_only
) {
1583 map
->cache_dirty
= true;
1589 if (map
->dev
&& strcmp(dev_name(map
->dev
), LOG_DEVICE
) == 0)
1590 dev_info(map
->dev
, "%x <= %x\n", reg
, val
);
1593 trace_regmap_reg_write(map
, reg
, val
);
1595 return map
->reg_write(context
, reg
, val
);
1599 * regmap_write(): Write a value to a single register
1601 * @map: Register map to write to
1602 * @reg: Register to write to
1603 * @val: Value to be written
1605 * A value of zero will be returned on success, a negative errno will
1606 * be returned in error cases.
1608 int regmap_write(struct regmap
*map
, unsigned int reg
, unsigned int val
)
1612 if (!IS_ALIGNED(reg
, map
->reg_stride
))
1615 map
->lock(map
->lock_arg
);
1617 ret
= _regmap_write(map
, reg
, val
);
1619 map
->unlock(map
->lock_arg
);
1623 EXPORT_SYMBOL_GPL(regmap_write
);
1626 * regmap_write_async(): Write a value to a single register asynchronously
1628 * @map: Register map to write to
1629 * @reg: Register to write to
1630 * @val: Value to be written
1632 * A value of zero will be returned on success, a negative errno will
1633 * be returned in error cases.
1635 int regmap_write_async(struct regmap
*map
, unsigned int reg
, unsigned int val
)
1639 if (!IS_ALIGNED(reg
, map
->reg_stride
))
1642 map
->lock(map
->lock_arg
);
1646 ret
= _regmap_write(map
, reg
, val
);
1650 map
->unlock(map
->lock_arg
);
1654 EXPORT_SYMBOL_GPL(regmap_write_async
);
1657 * regmap_raw_write(): Write raw values to one or more registers
1659 * @map: Register map to write to
1660 * @reg: Initial register to write to
1661 * @val: Block of data to be written, laid out for direct transmission to the
1663 * @val_len: Length of data pointed to by val.
1665 * This function is intended to be used for things like firmware
1666 * download where a large block of data needs to be transferred to the
1667 * device. No formatting will be done on the data provided.
1669 * A value of zero will be returned on success, a negative errno will
1670 * be returned in error cases.
1672 int regmap_raw_write(struct regmap
*map
, unsigned int reg
,
1673 const void *val
, size_t val_len
)
1677 if (!regmap_can_raw_write(map
))
1679 if (val_len
% map
->format
.val_bytes
)
1681 if (map
->max_raw_write
&& map
->max_raw_write
> val_len
)
1684 map
->lock(map
->lock_arg
);
1686 ret
= _regmap_raw_write(map
, reg
, val
, val_len
);
1688 map
->unlock(map
->lock_arg
);
1692 EXPORT_SYMBOL_GPL(regmap_raw_write
);
1695 * regmap_field_update_bits_base():
1696 * Perform a read/modify/write cycle on the register field
1697 * with change, async, force option
1699 * @field: Register field to write to
1700 * @mask: Bitmask to change
1701 * @val: Value to be written
1702 * @change: Boolean indicating if a write was done
1703 * @async: Boolean indicating asynchronously
1704 * @force: Boolean indicating use force update
1706 * A value of zero will be returned on success, a negative errno will
1707 * be returned in error cases.
1709 int regmap_field_update_bits_base(struct regmap_field
*field
,
1710 unsigned int mask
, unsigned int val
,
1711 bool *change
, bool async
, bool force
)
1713 mask
= (mask
<< field
->shift
) & field
->mask
;
1715 return regmap_update_bits_base(field
->regmap
, field
->reg
,
1716 mask
, val
<< field
->shift
,
1717 change
, async
, force
);
1719 EXPORT_SYMBOL_GPL(regmap_field_update_bits_base
);
1722 * regmap_fields_update_bits_base():
1723 * Perform a read/modify/write cycle on the register field
1724 * with change, async, force option
1726 * @field: Register field to write to
1728 * @mask: Bitmask to change
1729 * @val: Value to be written
1730 * @change: Boolean indicating if a write was done
1731 * @async: Boolean indicating asynchronously
1732 * @force: Boolean indicating use force update
1734 * A value of zero will be returned on success, a negative errno will
1735 * be returned in error cases.
1737 int regmap_fields_update_bits_base(struct regmap_field
*field
, unsigned int id
,
1738 unsigned int mask
, unsigned int val
,
1739 bool *change
, bool async
, bool force
)
1741 if (id
>= field
->id_size
)
1744 mask
= (mask
<< field
->shift
) & field
->mask
;
1746 return regmap_update_bits_base(field
->regmap
,
1747 field
->reg
+ (field
->id_offset
* id
),
1748 mask
, val
<< field
->shift
,
1749 change
, async
, force
);
1751 EXPORT_SYMBOL_GPL(regmap_fields_update_bits_base
);
1754 * regmap_bulk_write(): Write multiple registers to the device
1756 * @map: Register map to write to
1757 * @reg: First register to be write from
1758 * @val: Block of data to be written, in native register size for device
1759 * @val_count: Number of registers to write
1761 * This function is intended to be used for writing a large block of
1762 * data to the device either in single transfer or multiple transfer.
1764 * A value of zero will be returned on success, a negative errno will
1765 * be returned in error cases.
1767 int regmap_bulk_write(struct regmap
*map
, unsigned int reg
, const void *val
,
1771 size_t val_bytes
= map
->format
.val_bytes
;
1772 size_t total_size
= val_bytes
* val_count
;
1774 if (map
->bus
&& !map
->format
.parse_inplace
)
1776 if (!IS_ALIGNED(reg
, map
->reg_stride
))
1780 * Some devices don't support bulk write, for
1781 * them we have a series of single write operations in the first two if
1784 * The first if block is used for memory mapped io. It does not allow
1785 * val_bytes of 3 for example.
1786 * The second one is used for busses which do not have this limitation
1787 * and can write arbitrary value lengths.
1790 map
->lock(map
->lock_arg
);
1791 for (i
= 0; i
< val_count
; i
++) {
1794 switch (val_bytes
) {
1796 ival
= *(u8
*)(val
+ (i
* val_bytes
));
1799 ival
= *(u16
*)(val
+ (i
* val_bytes
));
1802 ival
= *(u32
*)(val
+ (i
* val_bytes
));
1806 ival
= *(u64
*)(val
+ (i
* val_bytes
));
1814 ret
= _regmap_write(map
, reg
+ (i
* map
->reg_stride
),
1820 map
->unlock(map
->lock_arg
);
1821 } else if (map
->use_single_write
||
1822 (map
->max_raw_write
&& map
->max_raw_write
< total_size
)) {
1823 int chunk_stride
= map
->reg_stride
;
1824 size_t chunk_size
= val_bytes
;
1825 size_t chunk_count
= val_count
;
1827 if (!map
->use_single_write
) {
1828 chunk_size
= map
->max_raw_write
;
1829 if (chunk_size
% val_bytes
)
1830 chunk_size
-= chunk_size
% val_bytes
;
1831 chunk_count
= total_size
/ chunk_size
;
1832 chunk_stride
*= chunk_size
/ val_bytes
;
1835 map
->lock(map
->lock_arg
);
1836 /* Write as many bytes as possible with chunk_size */
1837 for (i
= 0; i
< chunk_count
; i
++) {
1838 ret
= _regmap_raw_write(map
,
1839 reg
+ (i
* chunk_stride
),
1840 val
+ (i
* chunk_size
),
1846 /* Write remaining bytes */
1847 if (!ret
&& chunk_size
* i
< total_size
) {
1848 ret
= _regmap_raw_write(map
, reg
+ (i
* chunk_stride
),
1849 val
+ (i
* chunk_size
),
1850 total_size
- i
* chunk_size
);
1852 map
->unlock(map
->lock_arg
);
1859 wval
= kmemdup(val
, val_count
* val_bytes
, map
->alloc_flags
);
1861 dev_err(map
->dev
, "Error in memory allocation\n");
1864 for (i
= 0; i
< val_count
* val_bytes
; i
+= val_bytes
)
1865 map
->format
.parse_inplace(wval
+ i
);
1867 map
->lock(map
->lock_arg
);
1868 ret
= _regmap_raw_write(map
, reg
, wval
, val_bytes
* val_count
);
1869 map
->unlock(map
->lock_arg
);
1875 EXPORT_SYMBOL_GPL(regmap_bulk_write
);
1878 * _regmap_raw_multi_reg_write()
1880 * the (register,newvalue) pairs in regs have not been formatted, but
1881 * they are all in the same page and have been changed to being page
1882 * relative. The page register has been written if that was necessary.
1884 static int _regmap_raw_multi_reg_write(struct regmap
*map
,
1885 const struct reg_sequence
*regs
,
1892 size_t val_bytes
= map
->format
.val_bytes
;
1893 size_t reg_bytes
= map
->format
.reg_bytes
;
1894 size_t pad_bytes
= map
->format
.pad_bytes
;
1895 size_t pair_size
= reg_bytes
+ pad_bytes
+ val_bytes
;
1896 size_t len
= pair_size
* num_regs
;
1901 buf
= kzalloc(len
, GFP_KERNEL
);
1905 /* We have to linearise by hand. */
1909 for (i
= 0; i
< num_regs
; i
++) {
1910 unsigned int reg
= regs
[i
].reg
;
1911 unsigned int val
= regs
[i
].def
;
1912 trace_regmap_hw_write_start(map
, reg
, 1);
1913 map
->format
.format_reg(u8
, reg
, map
->reg_shift
);
1914 u8
+= reg_bytes
+ pad_bytes
;
1915 map
->format
.format_val(u8
, val
, 0);
1919 *u8
|= map
->write_flag_mask
;
1921 ret
= map
->bus
->write(map
->bus_context
, buf
, len
);
1925 for (i
= 0; i
< num_regs
; i
++) {
1926 int reg
= regs
[i
].reg
;
1927 trace_regmap_hw_write_done(map
, reg
, 1);
1932 static unsigned int _regmap_register_page(struct regmap
*map
,
1934 struct regmap_range_node
*range
)
1936 unsigned int win_page
= (reg
- range
->range_min
) / range
->window_len
;
1941 static int _regmap_range_multi_paged_reg_write(struct regmap
*map
,
1942 struct reg_sequence
*regs
,
1947 struct reg_sequence
*base
;
1948 unsigned int this_page
= 0;
1949 unsigned int page_change
= 0;
1951 * the set of registers are not neccessarily in order, but
1952 * since the order of write must be preserved this algorithm
1953 * chops the set each time the page changes. This also applies
1954 * if there is a delay required at any point in the sequence.
1957 for (i
= 0, n
= 0; i
< num_regs
; i
++, n
++) {
1958 unsigned int reg
= regs
[i
].reg
;
1959 struct regmap_range_node
*range
;
1961 range
= _regmap_range_lookup(map
, reg
);
1963 unsigned int win_page
= _regmap_register_page(map
, reg
,
1967 this_page
= win_page
;
1968 if (win_page
!= this_page
) {
1969 this_page
= win_page
;
1974 /* If we have both a page change and a delay make sure to
1975 * write the regs and apply the delay before we change the
1979 if (page_change
|| regs
[i
].delay_us
) {
1981 /* For situations where the first write requires
1982 * a delay we need to make sure we don't call
1983 * raw_multi_reg_write with n=0
1984 * This can't occur with page breaks as we
1985 * never write on the first iteration
1987 if (regs
[i
].delay_us
&& i
== 0)
1990 ret
= _regmap_raw_multi_reg_write(map
, base
, n
);
1994 if (regs
[i
].delay_us
)
1995 udelay(regs
[i
].delay_us
);
2001 ret
= _regmap_select_page(map
,
2014 return _regmap_raw_multi_reg_write(map
, base
, n
);
2018 static int _regmap_multi_reg_write(struct regmap
*map
,
2019 const struct reg_sequence
*regs
,
2025 if (!map
->can_multi_write
) {
2026 for (i
= 0; i
< num_regs
; i
++) {
2027 ret
= _regmap_write(map
, regs
[i
].reg
, regs
[i
].def
);
2031 if (regs
[i
].delay_us
)
2032 udelay(regs
[i
].delay_us
);
2037 if (!map
->format
.parse_inplace
)
2040 if (map
->writeable_reg
)
2041 for (i
= 0; i
< num_regs
; i
++) {
2042 int reg
= regs
[i
].reg
;
2043 if (!map
->writeable_reg(map
->dev
, reg
))
2045 if (!IS_ALIGNED(reg
, map
->reg_stride
))
2049 if (!map
->cache_bypass
) {
2050 for (i
= 0; i
< num_regs
; i
++) {
2051 unsigned int val
= regs
[i
].def
;
2052 unsigned int reg
= regs
[i
].reg
;
2053 ret
= regcache_write(map
, reg
, val
);
2056 "Error in caching of register: %x ret: %d\n",
2061 if (map
->cache_only
) {
2062 map
->cache_dirty
= true;
2069 for (i
= 0; i
< num_regs
; i
++) {
2070 unsigned int reg
= regs
[i
].reg
;
2071 struct regmap_range_node
*range
;
2073 /* Coalesce all the writes between a page break or a delay
2076 range
= _regmap_range_lookup(map
, reg
);
2077 if (range
|| regs
[i
].delay_us
) {
2078 size_t len
= sizeof(struct reg_sequence
)*num_regs
;
2079 struct reg_sequence
*base
= kmemdup(regs
, len
,
2083 ret
= _regmap_range_multi_paged_reg_write(map
, base
,
2090 return _regmap_raw_multi_reg_write(map
, regs
, num_regs
);
2094 * regmap_multi_reg_write(): Write multiple registers to the device
2096 * where the set of register,value pairs are supplied in any order,
2097 * possibly not all in a single range.
2099 * @map: Register map to write to
2100 * @regs: Array of structures containing register,value to be written
2101 * @num_regs: Number of registers to write
2103 * The 'normal' block write mode will send ultimately send data on the
2104 * target bus as R,V1,V2,V3,..,Vn where successively higer registers are
2105 * addressed. However, this alternative block multi write mode will send
2106 * the data as R1,V1,R2,V2,..,Rn,Vn on the target bus. The target device
2107 * must of course support the mode.
2109 * A value of zero will be returned on success, a negative errno will be
2110 * returned in error cases.
2112 int regmap_multi_reg_write(struct regmap
*map
, const struct reg_sequence
*regs
,
2117 map
->lock(map
->lock_arg
);
2119 ret
= _regmap_multi_reg_write(map
, regs
, num_regs
);
2121 map
->unlock(map
->lock_arg
);
2125 EXPORT_SYMBOL_GPL(regmap_multi_reg_write
);
2128 * regmap_multi_reg_write_bypassed(): Write multiple registers to the
2129 * device but not the cache
2131 * where the set of register are supplied in any order
2133 * @map: Register map to write to
2134 * @regs: Array of structures containing register,value to be written
2135 * @num_regs: Number of registers to write
2137 * This function is intended to be used for writing a large block of data
2138 * atomically to the device in single transfer for those I2C client devices
2139 * that implement this alternative block write mode.
2141 * A value of zero will be returned on success, a negative errno will
2142 * be returned in error cases.
2144 int regmap_multi_reg_write_bypassed(struct regmap
*map
,
2145 const struct reg_sequence
*regs
,
2151 map
->lock(map
->lock_arg
);
2153 bypass
= map
->cache_bypass
;
2154 map
->cache_bypass
= true;
2156 ret
= _regmap_multi_reg_write(map
, regs
, num_regs
);
2158 map
->cache_bypass
= bypass
;
2160 map
->unlock(map
->lock_arg
);
2164 EXPORT_SYMBOL_GPL(regmap_multi_reg_write_bypassed
);
2167 * regmap_raw_write_async(): Write raw values to one or more registers
2170 * @map: Register map to write to
2171 * @reg: Initial register to write to
2172 * @val: Block of data to be written, laid out for direct transmission to the
2173 * device. Must be valid until regmap_async_complete() is called.
2174 * @val_len: Length of data pointed to by val.
2176 * This function is intended to be used for things like firmware
2177 * download where a large block of data needs to be transferred to the
2178 * device. No formatting will be done on the data provided.
2180 * If supported by the underlying bus the write will be scheduled
2181 * asynchronously, helping maximise I/O speed on higher speed buses
2182 * like SPI. regmap_async_complete() can be called to ensure that all
2183 * asynchrnous writes have been completed.
2185 * A value of zero will be returned on success, a negative errno will
2186 * be returned in error cases.
2188 int regmap_raw_write_async(struct regmap
*map
, unsigned int reg
,
2189 const void *val
, size_t val_len
)
2193 if (val_len
% map
->format
.val_bytes
)
2195 if (!IS_ALIGNED(reg
, map
->reg_stride
))
2198 map
->lock(map
->lock_arg
);
2202 ret
= _regmap_raw_write(map
, reg
, val
, val_len
);
2206 map
->unlock(map
->lock_arg
);
2210 EXPORT_SYMBOL_GPL(regmap_raw_write_async
);
2212 static int _regmap_raw_read(struct regmap
*map
, unsigned int reg
, void *val
,
2213 unsigned int val_len
)
2215 struct regmap_range_node
*range
;
2216 u8
*u8
= map
->work_buf
;
2221 if (!map
->bus
|| !map
->bus
->read
)
2224 range
= _regmap_range_lookup(map
, reg
);
2226 ret
= _regmap_select_page(map
, ®
, range
,
2227 val_len
/ map
->format
.val_bytes
);
2232 map
->format
.format_reg(map
->work_buf
, reg
, map
->reg_shift
);
2235 * Some buses or devices flag reads by setting the high bits in the
2236 * register address; since it's always the high bits for all
2237 * current formats we can do this here rather than in
2238 * formatting. This may break if we get interesting formats.
2240 u8
[0] |= map
->read_flag_mask
;
2242 trace_regmap_hw_read_start(map
, reg
, val_len
/ map
->format
.val_bytes
);
2244 ret
= map
->bus
->read(map
->bus_context
, map
->work_buf
,
2245 map
->format
.reg_bytes
+ map
->format
.pad_bytes
,
2248 trace_regmap_hw_read_done(map
, reg
, val_len
/ map
->format
.val_bytes
);
2253 static int _regmap_bus_reg_read(void *context
, unsigned int reg
,
2256 struct regmap
*map
= context
;
2258 return map
->bus
->reg_read(map
->bus_context
, reg
, val
);
2261 static int _regmap_bus_read(void *context
, unsigned int reg
,
2265 struct regmap
*map
= context
;
2267 if (!map
->format
.parse_val
)
2270 ret
= _regmap_raw_read(map
, reg
, map
->work_buf
, map
->format
.val_bytes
);
2272 *val
= map
->format
.parse_val(map
->work_buf
);
2277 static int _regmap_read(struct regmap
*map
, unsigned int reg
,
2281 void *context
= _regmap_map_get_context(map
);
2283 if (!map
->cache_bypass
) {
2284 ret
= regcache_read(map
, reg
, val
);
2289 if (map
->cache_only
)
2292 if (!regmap_readable(map
, reg
))
2295 ret
= map
->reg_read(context
, reg
, val
);
2298 if (map
->dev
&& strcmp(dev_name(map
->dev
), LOG_DEVICE
) == 0)
2299 dev_info(map
->dev
, "%x => %x\n", reg
, *val
);
2302 trace_regmap_reg_read(map
, reg
, *val
);
2304 if (!map
->cache_bypass
)
2305 regcache_write(map
, reg
, *val
);
2312 * regmap_read(): Read a value from a single register
2314 * @map: Register map to read from
2315 * @reg: Register to be read from
2316 * @val: Pointer to store read value
2318 * A value of zero will be returned on success, a negative errno will
2319 * be returned in error cases.
2321 int regmap_read(struct regmap
*map
, unsigned int reg
, unsigned int *val
)
2325 if (!IS_ALIGNED(reg
, map
->reg_stride
))
2328 map
->lock(map
->lock_arg
);
2330 ret
= _regmap_read(map
, reg
, val
);
2332 map
->unlock(map
->lock_arg
);
2336 EXPORT_SYMBOL_GPL(regmap_read
);
2339 * regmap_raw_read(): Read raw data from the device
2341 * @map: Register map to read from
2342 * @reg: First register to be read from
2343 * @val: Pointer to store read value
2344 * @val_len: Size of data to read
2346 * A value of zero will be returned on success, a negative errno will
2347 * be returned in error cases.
2349 int regmap_raw_read(struct regmap
*map
, unsigned int reg
, void *val
,
2352 size_t val_bytes
= map
->format
.val_bytes
;
2353 size_t val_count
= val_len
/ val_bytes
;
2359 if (val_len
% map
->format
.val_bytes
)
2361 if (!IS_ALIGNED(reg
, map
->reg_stride
))
2366 map
->lock(map
->lock_arg
);
2368 if (regmap_volatile_range(map
, reg
, val_count
) || map
->cache_bypass
||
2369 map
->cache_type
== REGCACHE_NONE
) {
2370 if (!map
->bus
->read
) {
2374 if (map
->max_raw_read
&& map
->max_raw_read
< val_len
) {
2379 /* Physical block read if there's no cache involved */
2380 ret
= _regmap_raw_read(map
, reg
, val
, val_len
);
2383 /* Otherwise go word by word for the cache; should be low
2384 * cost as we expect to hit the cache.
2386 for (i
= 0; i
< val_count
; i
++) {
2387 ret
= _regmap_read(map
, reg
+ (i
* map
->reg_stride
),
2392 map
->format
.format_val(val
+ (i
* val_bytes
), v
, 0);
2397 map
->unlock(map
->lock_arg
);
2401 EXPORT_SYMBOL_GPL(regmap_raw_read
);
2404 * regmap_field_read(): Read a value to a single register field
2406 * @field: Register field to read from
2407 * @val: Pointer to store read value
2409 * A value of zero will be returned on success, a negative errno will
2410 * be returned in error cases.
2412 int regmap_field_read(struct regmap_field
*field
, unsigned int *val
)
2415 unsigned int reg_val
;
2416 ret
= regmap_read(field
->regmap
, field
->reg
, ®_val
);
2420 reg_val
&= field
->mask
;
2421 reg_val
>>= field
->shift
;
2426 EXPORT_SYMBOL_GPL(regmap_field_read
);
2429 * regmap_fields_read(): Read a value to a single register field with port ID
2431 * @field: Register field to read from
2433 * @val: Pointer to store read value
2435 * A value of zero will be returned on success, a negative errno will
2436 * be returned in error cases.
2438 int regmap_fields_read(struct regmap_field
*field
, unsigned int id
,
2442 unsigned int reg_val
;
2444 if (id
>= field
->id_size
)
2447 ret
= regmap_read(field
->regmap
,
2448 field
->reg
+ (field
->id_offset
* id
),
2453 reg_val
&= field
->mask
;
2454 reg_val
>>= field
->shift
;
2459 EXPORT_SYMBOL_GPL(regmap_fields_read
);
2462 * regmap_bulk_read(): Read multiple registers from the device
2464 * @map: Register map to read from
2465 * @reg: First register to be read from
2466 * @val: Pointer to store read value, in native register size for device
2467 * @val_count: Number of registers to read
2469 * A value of zero will be returned on success, a negative errno will
2470 * be returned in error cases.
2472 int regmap_bulk_read(struct regmap
*map
, unsigned int reg
, void *val
,
2476 size_t val_bytes
= map
->format
.val_bytes
;
2477 bool vol
= regmap_volatile_range(map
, reg
, val_count
);
2479 if (!IS_ALIGNED(reg
, map
->reg_stride
))
2482 if (map
->bus
&& map
->format
.parse_inplace
&& (vol
|| map
->cache_type
== REGCACHE_NONE
)) {
2484 * Some devices does not support bulk read, for
2485 * them we have a series of single read operations.
2487 size_t total_size
= val_bytes
* val_count
;
2489 if (!map
->use_single_read
&&
2490 (!map
->max_raw_read
|| map
->max_raw_read
> total_size
)) {
2491 ret
= regmap_raw_read(map
, reg
, val
,
2492 val_bytes
* val_count
);
2497 * Some devices do not support bulk read or do not
2498 * support large bulk reads, for them we have a series
2499 * of read operations.
2501 int chunk_stride
= map
->reg_stride
;
2502 size_t chunk_size
= val_bytes
;
2503 size_t chunk_count
= val_count
;
2505 if (!map
->use_single_read
) {
2506 chunk_size
= map
->max_raw_read
;
2507 if (chunk_size
% val_bytes
)
2508 chunk_size
-= chunk_size
% val_bytes
;
2509 chunk_count
= total_size
/ chunk_size
;
2510 chunk_stride
*= chunk_size
/ val_bytes
;
2513 /* Read bytes that fit into a multiple of chunk_size */
2514 for (i
= 0; i
< chunk_count
; i
++) {
2515 ret
= regmap_raw_read(map
,
2516 reg
+ (i
* chunk_stride
),
2517 val
+ (i
* chunk_size
),
2523 /* Read remaining bytes */
2524 if (chunk_size
* i
< total_size
) {
2525 ret
= regmap_raw_read(map
,
2526 reg
+ (i
* chunk_stride
),
2527 val
+ (i
* chunk_size
),
2528 total_size
- i
* chunk_size
);
2534 for (i
= 0; i
< val_count
* val_bytes
; i
+= val_bytes
)
2535 map
->format
.parse_inplace(val
+ i
);
2537 for (i
= 0; i
< val_count
; i
++) {
2539 ret
= regmap_read(map
, reg
+ (i
* map
->reg_stride
),
2544 if (map
->format
.format_val
) {
2545 map
->format
.format_val(val
+ (i
* val_bytes
), ival
, 0);
2547 /* Devices providing read and write
2548 * operations can use the bulk I/O
2549 * functions if they define a val_bytes,
2550 * we assume that the values are native
2560 switch (map
->format
.val_bytes
) {
2584 EXPORT_SYMBOL_GPL(regmap_bulk_read
);
2586 static int _regmap_update_bits(struct regmap
*map
, unsigned int reg
,
2587 unsigned int mask
, unsigned int val
,
2588 bool *change
, bool force_write
)
2591 unsigned int tmp
, orig
;
2596 if (regmap_volatile(map
, reg
) && map
->reg_update_bits
) {
2597 ret
= map
->reg_update_bits(map
->bus_context
, reg
, mask
, val
);
2598 if (ret
== 0 && change
)
2601 ret
= _regmap_read(map
, reg
, &orig
);
2608 if (force_write
|| (tmp
!= orig
)) {
2609 ret
= _regmap_write(map
, reg
, tmp
);
2610 if (ret
== 0 && change
)
2619 * regmap_update_bits_base:
2620 * Perform a read/modify/write cycle on the
2621 * register map with change, async, force option
2623 * @map: Register map to update
2624 * @reg: Register to update
2625 * @mask: Bitmask to change
2626 * @val: New value for bitmask
2627 * @change: Boolean indicating if a write was done
2628 * @async: Boolean indicating asynchronously
2629 * @force: Boolean indicating use force update
2631 * if async was true,
2632 * With most buses the read must be done synchronously so this is most
2633 * useful for devices with a cache which do not need to interact with
2634 * the hardware to determine the current register value.
2636 * Returns zero for success, a negative number on error.
2638 int regmap_update_bits_base(struct regmap
*map
, unsigned int reg
,
2639 unsigned int mask
, unsigned int val
,
2640 bool *change
, bool async
, bool force
)
2644 map
->lock(map
->lock_arg
);
2648 ret
= _regmap_update_bits(map
, reg
, mask
, val
, change
, force
);
2652 map
->unlock(map
->lock_arg
);
2656 EXPORT_SYMBOL_GPL(regmap_update_bits_base
);
2659 * regmap_write_bits: Perform a read/modify/write cycle on the register map
2661 * @map: Register map to update
2662 * @reg: Register to update
2663 * @mask: Bitmask to change
2664 * @val: New value for bitmask
2666 * Returns zero for success, a negative number on error.
2668 int regmap_write_bits(struct regmap
*map
, unsigned int reg
,
2669 unsigned int mask
, unsigned int val
)
2673 map
->lock(map
->lock_arg
);
2674 ret
= _regmap_update_bits(map
, reg
, mask
, val
, NULL
, true);
2675 map
->unlock(map
->lock_arg
);
2679 EXPORT_SYMBOL_GPL(regmap_write_bits
);
2681 void regmap_async_complete_cb(struct regmap_async
*async
, int ret
)
2683 struct regmap
*map
= async
->map
;
2686 trace_regmap_async_io_complete(map
);
2688 spin_lock(&map
->async_lock
);
2689 list_move(&async
->list
, &map
->async_free
);
2690 wake
= list_empty(&map
->async_list
);
2693 map
->async_ret
= ret
;
2695 spin_unlock(&map
->async_lock
);
2698 wake_up(&map
->async_waitq
);
2700 EXPORT_SYMBOL_GPL(regmap_async_complete_cb
);
2702 static int regmap_async_is_done(struct regmap
*map
)
2704 unsigned long flags
;
2707 spin_lock_irqsave(&map
->async_lock
, flags
);
2708 ret
= list_empty(&map
->async_list
);
2709 spin_unlock_irqrestore(&map
->async_lock
, flags
);
2715 * regmap_async_complete: Ensure all asynchronous I/O has completed.
2717 * @map: Map to operate on.
2719 * Blocks until any pending asynchronous I/O has completed. Returns
2720 * an error code for any failed I/O operations.
2722 int regmap_async_complete(struct regmap
*map
)
2724 unsigned long flags
;
2727 /* Nothing to do with no async support */
2728 if (!map
->bus
|| !map
->bus
->async_write
)
2731 trace_regmap_async_complete_start(map
);
2733 wait_event(map
->async_waitq
, regmap_async_is_done(map
));
2735 spin_lock_irqsave(&map
->async_lock
, flags
);
2736 ret
= map
->async_ret
;
2738 spin_unlock_irqrestore(&map
->async_lock
, flags
);
2740 trace_regmap_async_complete_done(map
);
2744 EXPORT_SYMBOL_GPL(regmap_async_complete
);
2747 * regmap_register_patch: Register and apply register updates to be applied
2748 * on device initialistion
2750 * @map: Register map to apply updates to.
2751 * @regs: Values to update.
2752 * @num_regs: Number of entries in regs.
2754 * Register a set of register updates to be applied to the device
2755 * whenever the device registers are synchronised with the cache and
2756 * apply them immediately. Typically this is used to apply
2757 * corrections to be applied to the device defaults on startup, such
2758 * as the updates some vendors provide to undocumented registers.
2760 * The caller must ensure that this function cannot be called
2761 * concurrently with either itself or regcache_sync().
2763 int regmap_register_patch(struct regmap
*map
, const struct reg_sequence
*regs
,
2766 struct reg_sequence
*p
;
2770 if (WARN_ONCE(num_regs
<= 0, "invalid registers number (%d)\n",
2774 p
= krealloc(map
->patch
,
2775 sizeof(struct reg_sequence
) * (map
->patch_regs
+ num_regs
),
2778 memcpy(p
+ map
->patch_regs
, regs
, num_regs
* sizeof(*regs
));
2780 map
->patch_regs
+= num_regs
;
2785 map
->lock(map
->lock_arg
);
2787 bypass
= map
->cache_bypass
;
2789 map
->cache_bypass
= true;
2792 ret
= _regmap_multi_reg_write(map
, regs
, num_regs
);
2795 map
->cache_bypass
= bypass
;
2797 map
->unlock(map
->lock_arg
);
2799 regmap_async_complete(map
);
2803 EXPORT_SYMBOL_GPL(regmap_register_patch
);
2806 * regmap_get_val_bytes(): Report the size of a register value
2808 * Report the size of a register value, mainly intended to for use by
2809 * generic infrastructure built on top of regmap.
2811 int regmap_get_val_bytes(struct regmap
*map
)
2813 if (map
->format
.format_write
)
2816 return map
->format
.val_bytes
;
2818 EXPORT_SYMBOL_GPL(regmap_get_val_bytes
);
2821 * regmap_get_max_register(): Report the max register value
2823 * Report the max register value, mainly intended to for use by
2824 * generic infrastructure built on top of regmap.
2826 int regmap_get_max_register(struct regmap
*map
)
2828 return map
->max_register
? map
->max_register
: -EINVAL
;
2830 EXPORT_SYMBOL_GPL(regmap_get_max_register
);
2833 * regmap_get_reg_stride(): Report the register address stride
2835 * Report the register address stride, mainly intended to for use by
2836 * generic infrastructure built on top of regmap.
2838 int regmap_get_reg_stride(struct regmap
*map
)
2840 return map
->reg_stride
;
2842 EXPORT_SYMBOL_GPL(regmap_get_reg_stride
);
2844 int regmap_parse_val(struct regmap
*map
, const void *buf
,
2847 if (!map
->format
.parse_val
)
2850 *val
= map
->format
.parse_val(buf
);
2854 EXPORT_SYMBOL_GPL(regmap_parse_val
);
2856 static int __init
regmap_initcall(void)
2858 regmap_debugfs_initcall();
2862 postcore_initcall(regmap_initcall
);