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>
18 #include <linux/rbtree.h>
19 #include <linux/sched.h>
21 #define CREATE_TRACE_POINTS
22 #include <trace/events/regmap.h>
27 * Sometimes for failures during very early init the trace
28 * infrastructure isn't available early enough to be used. For this
29 * sort of problem defining LOG_DEVICE will add printks for basic
30 * register I/O on a specific device.
34 static int _regmap_update_bits(struct regmap
*map
, unsigned int reg
,
35 unsigned int mask
, unsigned int val
,
38 static int _regmap_bus_read(void *context
, unsigned int reg
,
40 static int _regmap_bus_formatted_write(void *context
, unsigned int reg
,
42 static int _regmap_bus_raw_write(void *context
, unsigned int reg
,
45 static void async_cleanup(struct work_struct
*work
)
47 struct regmap_async
*async
= container_of(work
, struct regmap_async
,
50 kfree(async
->work_buf
);
54 bool regmap_reg_in_ranges(unsigned int reg
,
55 const struct regmap_range
*ranges
,
58 const struct regmap_range
*r
;
61 for (i
= 0, r
= ranges
; i
< nranges
; i
++, r
++)
62 if (regmap_reg_in_range(reg
, r
))
66 EXPORT_SYMBOL_GPL(regmap_reg_in_ranges
);
68 bool regmap_check_range_table(struct regmap
*map
, unsigned int reg
,
69 const struct regmap_access_table
*table
)
71 /* Check "no ranges" first */
72 if (regmap_reg_in_ranges(reg
, table
->no_ranges
, table
->n_no_ranges
))
75 /* In case zero "yes ranges" are supplied, any reg is OK */
76 if (!table
->n_yes_ranges
)
79 return regmap_reg_in_ranges(reg
, table
->yes_ranges
,
82 EXPORT_SYMBOL_GPL(regmap_check_range_table
);
84 bool regmap_writeable(struct regmap
*map
, unsigned int reg
)
86 if (map
->max_register
&& reg
> map
->max_register
)
89 if (map
->writeable_reg
)
90 return map
->writeable_reg(map
->dev
, reg
);
93 return regmap_check_range_table(map
, reg
, map
->wr_table
);
98 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 (!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_native(void *buf
, unsigned int val
,
207 *(u16
*)buf
= val
<< shift
;
210 static void regmap_format_24(void *buf
, unsigned int val
, unsigned int shift
)
221 static void regmap_format_32_be(void *buf
, unsigned int val
, unsigned int shift
)
225 b
[0] = cpu_to_be32(val
<< shift
);
228 static void regmap_format_32_native(void *buf
, unsigned int val
,
231 *(u32
*)buf
= val
<< shift
;
234 static void regmap_parse_inplace_noop(void *buf
)
238 static unsigned int regmap_parse_8(const void *buf
)
245 static unsigned int regmap_parse_16_be(const void *buf
)
247 const __be16
*b
= buf
;
249 return be16_to_cpu(b
[0]);
252 static void regmap_parse_16_be_inplace(void *buf
)
256 b
[0] = be16_to_cpu(b
[0]);
259 static unsigned int regmap_parse_16_native(const void *buf
)
264 static unsigned int regmap_parse_24(const void *buf
)
267 unsigned int ret
= b
[2];
268 ret
|= ((unsigned int)b
[1]) << 8;
269 ret
|= ((unsigned int)b
[0]) << 16;
274 static unsigned int regmap_parse_32_be(const void *buf
)
276 const __be32
*b
= buf
;
278 return be32_to_cpu(b
[0]);
281 static void regmap_parse_32_be_inplace(void *buf
)
285 b
[0] = be32_to_cpu(b
[0]);
288 static unsigned int regmap_parse_32_native(const void *buf
)
293 static void regmap_lock_mutex(void *__map
)
295 struct regmap
*map
= __map
;
296 mutex_lock(&map
->mutex
);
299 static void regmap_unlock_mutex(void *__map
)
301 struct regmap
*map
= __map
;
302 mutex_unlock(&map
->mutex
);
305 static void regmap_lock_spinlock(void *__map
)
307 struct regmap
*map
= __map
;
310 spin_lock_irqsave(&map
->spinlock
, flags
);
311 map
->spinlock_flags
= flags
;
314 static void regmap_unlock_spinlock(void *__map
)
316 struct regmap
*map
= __map
;
317 spin_unlock_irqrestore(&map
->spinlock
, map
->spinlock_flags
);
320 static void dev_get_regmap_release(struct device
*dev
, void *res
)
323 * We don't actually have anything to do here; the goal here
324 * is not to manage the regmap but to provide a simple way to
325 * get the regmap back given a struct device.
329 static bool _regmap_range_add(struct regmap
*map
,
330 struct regmap_range_node
*data
)
332 struct rb_root
*root
= &map
->range_tree
;
333 struct rb_node
**new = &(root
->rb_node
), *parent
= NULL
;
336 struct regmap_range_node
*this =
337 container_of(*new, struct regmap_range_node
, node
);
340 if (data
->range_max
< this->range_min
)
341 new = &((*new)->rb_left
);
342 else if (data
->range_min
> this->range_max
)
343 new = &((*new)->rb_right
);
348 rb_link_node(&data
->node
, parent
, new);
349 rb_insert_color(&data
->node
, root
);
354 static struct regmap_range_node
*_regmap_range_lookup(struct regmap
*map
,
357 struct rb_node
*node
= map
->range_tree
.rb_node
;
360 struct regmap_range_node
*this =
361 container_of(node
, struct regmap_range_node
, node
);
363 if (reg
< this->range_min
)
364 node
= node
->rb_left
;
365 else if (reg
> this->range_max
)
366 node
= node
->rb_right
;
374 static void regmap_range_exit(struct regmap
*map
)
376 struct rb_node
*next
;
377 struct regmap_range_node
*range_node
;
379 next
= rb_first(&map
->range_tree
);
381 range_node
= rb_entry(next
, struct regmap_range_node
, node
);
382 next
= rb_next(&range_node
->node
);
383 rb_erase(&range_node
->node
, &map
->range_tree
);
387 kfree(map
->selector_work_buf
);
391 * regmap_init(): Initialise register map
393 * @dev: Device that will be interacted with
394 * @bus: Bus-specific callbacks to use with device
395 * @bus_context: Data passed to bus-specific callbacks
396 * @config: Configuration for register map
398 * The return value will be an ERR_PTR() on error or a valid pointer to
399 * a struct regmap. This function should generally not be called
400 * directly, it should be called by bus-specific init functions.
402 struct regmap
*regmap_init(struct device
*dev
,
403 const struct regmap_bus
*bus
,
405 const struct regmap_config
*config
)
407 struct regmap
*map
, **m
;
409 enum regmap_endian reg_endian
, val_endian
;
415 map
= kzalloc(sizeof(*map
), GFP_KERNEL
);
421 if (config
->lock
&& config
->unlock
) {
422 map
->lock
= config
->lock
;
423 map
->unlock
= config
->unlock
;
424 map
->lock_arg
= config
->lock_arg
;
426 if ((bus
&& bus
->fast_io
) ||
428 spin_lock_init(&map
->spinlock
);
429 map
->lock
= regmap_lock_spinlock
;
430 map
->unlock
= regmap_unlock_spinlock
;
432 mutex_init(&map
->mutex
);
433 map
->lock
= regmap_lock_mutex
;
434 map
->unlock
= regmap_unlock_mutex
;
438 map
->format
.reg_bytes
= DIV_ROUND_UP(config
->reg_bits
, 8);
439 map
->format
.pad_bytes
= config
->pad_bits
/ 8;
440 map
->format
.val_bytes
= DIV_ROUND_UP(config
->val_bits
, 8);
441 map
->format
.buf_size
= DIV_ROUND_UP(config
->reg_bits
+
442 config
->val_bits
+ config
->pad_bits
, 8);
443 map
->reg_shift
= config
->pad_bits
% 8;
444 if (config
->reg_stride
)
445 map
->reg_stride
= config
->reg_stride
;
448 map
->use_single_rw
= config
->use_single_rw
;
451 map
->bus_context
= bus_context
;
452 map
->max_register
= config
->max_register
;
453 map
->wr_table
= config
->wr_table
;
454 map
->rd_table
= config
->rd_table
;
455 map
->volatile_table
= config
->volatile_table
;
456 map
->precious_table
= config
->precious_table
;
457 map
->writeable_reg
= config
->writeable_reg
;
458 map
->readable_reg
= config
->readable_reg
;
459 map
->volatile_reg
= config
->volatile_reg
;
460 map
->precious_reg
= config
->precious_reg
;
461 map
->cache_type
= config
->cache_type
;
462 map
->name
= config
->name
;
464 spin_lock_init(&map
->async_lock
);
465 INIT_LIST_HEAD(&map
->async_list
);
466 init_waitqueue_head(&map
->async_waitq
);
468 if (config
->read_flag_mask
|| config
->write_flag_mask
) {
469 map
->read_flag_mask
= config
->read_flag_mask
;
470 map
->write_flag_mask
= config
->write_flag_mask
;
472 map
->read_flag_mask
= bus
->read_flag_mask
;
476 map
->reg_read
= config
->reg_read
;
477 map
->reg_write
= config
->reg_write
;
479 map
->defer_caching
= false;
480 goto skip_format_initialization
;
482 map
->reg_read
= _regmap_bus_read
;
485 reg_endian
= config
->reg_format_endian
;
486 if (reg_endian
== REGMAP_ENDIAN_DEFAULT
)
487 reg_endian
= bus
->reg_format_endian_default
;
488 if (reg_endian
== REGMAP_ENDIAN_DEFAULT
)
489 reg_endian
= REGMAP_ENDIAN_BIG
;
491 val_endian
= config
->val_format_endian
;
492 if (val_endian
== REGMAP_ENDIAN_DEFAULT
)
493 val_endian
= bus
->val_format_endian_default
;
494 if (val_endian
== REGMAP_ENDIAN_DEFAULT
)
495 val_endian
= REGMAP_ENDIAN_BIG
;
497 switch (config
->reg_bits
+ map
->reg_shift
) {
499 switch (config
->val_bits
) {
501 map
->format
.format_write
= regmap_format_2_6_write
;
509 switch (config
->val_bits
) {
511 map
->format
.format_write
= regmap_format_4_12_write
;
519 switch (config
->val_bits
) {
521 map
->format
.format_write
= regmap_format_7_9_write
;
529 switch (config
->val_bits
) {
531 map
->format
.format_write
= regmap_format_10_14_write
;
539 map
->format
.format_reg
= regmap_format_8
;
543 switch (reg_endian
) {
544 case REGMAP_ENDIAN_BIG
:
545 map
->format
.format_reg
= regmap_format_16_be
;
547 case REGMAP_ENDIAN_NATIVE
:
548 map
->format
.format_reg
= regmap_format_16_native
;
556 if (reg_endian
!= REGMAP_ENDIAN_BIG
)
558 map
->format
.format_reg
= regmap_format_24
;
562 switch (reg_endian
) {
563 case REGMAP_ENDIAN_BIG
:
564 map
->format
.format_reg
= regmap_format_32_be
;
566 case REGMAP_ENDIAN_NATIVE
:
567 map
->format
.format_reg
= regmap_format_32_native
;
578 if (val_endian
== REGMAP_ENDIAN_NATIVE
)
579 map
->format
.parse_inplace
= regmap_parse_inplace_noop
;
581 switch (config
->val_bits
) {
583 map
->format
.format_val
= regmap_format_8
;
584 map
->format
.parse_val
= regmap_parse_8
;
585 map
->format
.parse_inplace
= regmap_parse_inplace_noop
;
588 switch (val_endian
) {
589 case REGMAP_ENDIAN_BIG
:
590 map
->format
.format_val
= regmap_format_16_be
;
591 map
->format
.parse_val
= regmap_parse_16_be
;
592 map
->format
.parse_inplace
= regmap_parse_16_be_inplace
;
594 case REGMAP_ENDIAN_NATIVE
:
595 map
->format
.format_val
= regmap_format_16_native
;
596 map
->format
.parse_val
= regmap_parse_16_native
;
603 if (val_endian
!= REGMAP_ENDIAN_BIG
)
605 map
->format
.format_val
= regmap_format_24
;
606 map
->format
.parse_val
= regmap_parse_24
;
609 switch (val_endian
) {
610 case REGMAP_ENDIAN_BIG
:
611 map
->format
.format_val
= regmap_format_32_be
;
612 map
->format
.parse_val
= regmap_parse_32_be
;
613 map
->format
.parse_inplace
= regmap_parse_32_be_inplace
;
615 case REGMAP_ENDIAN_NATIVE
:
616 map
->format
.format_val
= regmap_format_32_native
;
617 map
->format
.parse_val
= regmap_parse_32_native
;
625 if (map
->format
.format_write
) {
626 if ((reg_endian
!= REGMAP_ENDIAN_BIG
) ||
627 (val_endian
!= REGMAP_ENDIAN_BIG
))
629 map
->use_single_rw
= true;
632 if (!map
->format
.format_write
&&
633 !(map
->format
.format_reg
&& map
->format
.format_val
))
636 map
->work_buf
= kzalloc(map
->format
.buf_size
, GFP_KERNEL
);
637 if (map
->work_buf
== NULL
) {
642 if (map
->format
.format_write
) {
643 map
->defer_caching
= false;
644 map
->reg_write
= _regmap_bus_formatted_write
;
645 } else if (map
->format
.format_val
) {
646 map
->defer_caching
= true;
647 map
->reg_write
= _regmap_bus_raw_write
;
650 skip_format_initialization
:
652 map
->range_tree
= RB_ROOT
;
653 for (i
= 0; i
< config
->num_ranges
; i
++) {
654 const struct regmap_range_cfg
*range_cfg
= &config
->ranges
[i
];
655 struct regmap_range_node
*new;
658 if (range_cfg
->range_max
< range_cfg
->range_min
) {
659 dev_err(map
->dev
, "Invalid range %d: %d < %d\n", i
,
660 range_cfg
->range_max
, range_cfg
->range_min
);
664 if (range_cfg
->range_max
> map
->max_register
) {
665 dev_err(map
->dev
, "Invalid range %d: %d > %d\n", i
,
666 range_cfg
->range_max
, map
->max_register
);
670 if (range_cfg
->selector_reg
> map
->max_register
) {
672 "Invalid range %d: selector out of map\n", i
);
676 if (range_cfg
->window_len
== 0) {
677 dev_err(map
->dev
, "Invalid range %d: window_len 0\n",
682 /* Make sure, that this register range has no selector
683 or data window within its boundary */
684 for (j
= 0; j
< config
->num_ranges
; j
++) {
685 unsigned sel_reg
= config
->ranges
[j
].selector_reg
;
686 unsigned win_min
= config
->ranges
[j
].window_start
;
687 unsigned win_max
= win_min
+
688 config
->ranges
[j
].window_len
- 1;
690 if (range_cfg
->range_min
<= sel_reg
&&
691 sel_reg
<= range_cfg
->range_max
) {
693 "Range %d: selector for %d in window\n",
698 if (!(win_max
< range_cfg
->range_min
||
699 win_min
> range_cfg
->range_max
)) {
701 "Range %d: window for %d in window\n",
707 new = kzalloc(sizeof(*new), GFP_KERNEL
);
714 new->name
= range_cfg
->name
;
715 new->range_min
= range_cfg
->range_min
;
716 new->range_max
= range_cfg
->range_max
;
717 new->selector_reg
= range_cfg
->selector_reg
;
718 new->selector_mask
= range_cfg
->selector_mask
;
719 new->selector_shift
= range_cfg
->selector_shift
;
720 new->window_start
= range_cfg
->window_start
;
721 new->window_len
= range_cfg
->window_len
;
723 if (_regmap_range_add(map
, new) == false) {
724 dev_err(map
->dev
, "Failed to add range %d\n", i
);
729 if (map
->selector_work_buf
== NULL
) {
730 map
->selector_work_buf
=
731 kzalloc(map
->format
.buf_size
, GFP_KERNEL
);
732 if (map
->selector_work_buf
== NULL
) {
739 regmap_debugfs_init(map
, config
->name
);
741 ret
= regcache_init(map
, config
);
745 /* Add a devres resource for dev_get_regmap() */
746 m
= devres_alloc(dev_get_regmap_release
, sizeof(*m
), GFP_KERNEL
);
757 regmap_debugfs_exit(map
);
760 regmap_range_exit(map
);
761 kfree(map
->work_buf
);
767 EXPORT_SYMBOL_GPL(regmap_init
);
769 static void devm_regmap_release(struct device
*dev
, void *res
)
771 regmap_exit(*(struct regmap
**)res
);
775 * devm_regmap_init(): Initialise managed register map
777 * @dev: Device that will be interacted with
778 * @bus: Bus-specific callbacks to use with device
779 * @bus_context: Data passed to bus-specific callbacks
780 * @config: Configuration for register map
782 * The return value will be an ERR_PTR() on error or a valid pointer
783 * to a struct regmap. This function should generally not be called
784 * directly, it should be called by bus-specific init functions. The
785 * map will be automatically freed by the device management code.
787 struct regmap
*devm_regmap_init(struct device
*dev
,
788 const struct regmap_bus
*bus
,
790 const struct regmap_config
*config
)
792 struct regmap
**ptr
, *regmap
;
794 ptr
= devres_alloc(devm_regmap_release
, sizeof(*ptr
), GFP_KERNEL
);
796 return ERR_PTR(-ENOMEM
);
798 regmap
= regmap_init(dev
, bus
, bus_context
, config
);
799 if (!IS_ERR(regmap
)) {
801 devres_add(dev
, ptr
);
808 EXPORT_SYMBOL_GPL(devm_regmap_init
);
810 static void regmap_field_init(struct regmap_field
*rm_field
,
811 struct regmap
*regmap
, struct reg_field reg_field
)
813 int field_bits
= reg_field
.msb
- reg_field
.lsb
+ 1;
814 rm_field
->regmap
= regmap
;
815 rm_field
->reg
= reg_field
.reg
;
816 rm_field
->shift
= reg_field
.lsb
;
817 rm_field
->mask
= ((BIT(field_bits
) - 1) << reg_field
.lsb
);
821 * devm_regmap_field_alloc(): Allocate and initialise a register field
824 * @dev: Device that will be interacted with
825 * @regmap: regmap bank in which this register field is located.
826 * @reg_field: Register field with in the bank.
828 * The return value will be an ERR_PTR() on error or a valid pointer
829 * to a struct regmap_field. The regmap_field will be automatically freed
830 * by the device management code.
832 struct regmap_field
*devm_regmap_field_alloc(struct device
*dev
,
833 struct regmap
*regmap
, struct reg_field reg_field
)
835 struct regmap_field
*rm_field
= devm_kzalloc(dev
,
836 sizeof(*rm_field
), GFP_KERNEL
);
838 return ERR_PTR(-ENOMEM
);
840 regmap_field_init(rm_field
, regmap
, reg_field
);
845 EXPORT_SYMBOL_GPL(devm_regmap_field_alloc
);
848 * devm_regmap_field_free(): Free register field allocated using
849 * devm_regmap_field_alloc. Usally drivers need not call this function,
850 * as the memory allocated via devm will be freed as per device-driver
853 * @dev: Device that will be interacted with
854 * @field: regmap field which should be freed.
856 void devm_regmap_field_free(struct device
*dev
,
857 struct regmap_field
*field
)
859 devm_kfree(dev
, field
);
861 EXPORT_SYMBOL_GPL(devm_regmap_field_free
);
864 * regmap_field_alloc(): Allocate and initialise a register field
867 * @regmap: regmap bank in which this register field is located.
868 * @reg_field: Register field with in the bank.
870 * The return value will be an ERR_PTR() on error or a valid pointer
871 * to a struct regmap_field. The regmap_field should be freed by the
872 * user once its finished working with it using regmap_field_free().
874 struct regmap_field
*regmap_field_alloc(struct regmap
*regmap
,
875 struct reg_field reg_field
)
877 struct regmap_field
*rm_field
= kzalloc(sizeof(*rm_field
), GFP_KERNEL
);
880 return ERR_PTR(-ENOMEM
);
882 regmap_field_init(rm_field
, regmap
, reg_field
);
886 EXPORT_SYMBOL_GPL(regmap_field_alloc
);
889 * regmap_field_free(): Free register field allocated using regmap_field_alloc
891 * @field: regmap field which should be freed.
893 void regmap_field_free(struct regmap_field
*field
)
897 EXPORT_SYMBOL_GPL(regmap_field_free
);
900 * regmap_reinit_cache(): Reinitialise the current register cache
902 * @map: Register map to operate on.
903 * @config: New configuration. Only the cache data will be used.
905 * Discard any existing register cache for the map and initialize a
906 * new cache. This can be used to restore the cache to defaults or to
907 * update the cache configuration to reflect runtime discovery of the
910 * No explicit locking is done here, the user needs to ensure that
911 * this function will not race with other calls to regmap.
913 int regmap_reinit_cache(struct regmap
*map
, const struct regmap_config
*config
)
916 regmap_debugfs_exit(map
);
918 map
->max_register
= config
->max_register
;
919 map
->writeable_reg
= config
->writeable_reg
;
920 map
->readable_reg
= config
->readable_reg
;
921 map
->volatile_reg
= config
->volatile_reg
;
922 map
->precious_reg
= config
->precious_reg
;
923 map
->cache_type
= config
->cache_type
;
925 regmap_debugfs_init(map
, config
->name
);
927 map
->cache_bypass
= false;
928 map
->cache_only
= false;
930 return regcache_init(map
, config
);
932 EXPORT_SYMBOL_GPL(regmap_reinit_cache
);
935 * regmap_exit(): Free a previously allocated register map
937 void regmap_exit(struct regmap
*map
)
940 regmap_debugfs_exit(map
);
941 regmap_range_exit(map
);
942 if (map
->bus
&& map
->bus
->free_context
)
943 map
->bus
->free_context(map
->bus_context
);
944 kfree(map
->work_buf
);
947 EXPORT_SYMBOL_GPL(regmap_exit
);
949 static int dev_get_regmap_match(struct device
*dev
, void *res
, void *data
)
951 struct regmap
**r
= res
;
957 /* If the user didn't specify a name match any */
959 return (*r
)->name
== data
;
965 * dev_get_regmap(): Obtain the regmap (if any) for a device
967 * @dev: Device to retrieve the map for
968 * @name: Optional name for the register map, usually NULL.
970 * Returns the regmap for the device if one is present, or NULL. If
971 * name is specified then it must match the name specified when
972 * registering the device, if it is NULL then the first regmap found
973 * will be used. Devices with multiple register maps are very rare,
974 * generic code should normally not need to specify a name.
976 struct regmap
*dev_get_regmap(struct device
*dev
, const char *name
)
978 struct regmap
**r
= devres_find(dev
, dev_get_regmap_release
,
979 dev_get_regmap_match
, (void *)name
);
985 EXPORT_SYMBOL_GPL(dev_get_regmap
);
987 static int _regmap_select_page(struct regmap
*map
, unsigned int *reg
,
988 struct regmap_range_node
*range
,
989 unsigned int val_num
)
992 unsigned int win_offset
;
993 unsigned int win_page
;
997 win_offset
= (*reg
- range
->range_min
) % range
->window_len
;
998 win_page
= (*reg
- range
->range_min
) / range
->window_len
;
1001 /* Bulk write shouldn't cross range boundary */
1002 if (*reg
+ val_num
- 1 > range
->range_max
)
1005 /* ... or single page boundary */
1006 if (val_num
> range
->window_len
- win_offset
)
1010 /* It is possible to have selector register inside data window.
1011 In that case, selector register is located on every page and
1012 it needs no page switching, when accessed alone. */
1014 range
->window_start
+ win_offset
!= range
->selector_reg
) {
1015 /* Use separate work_buf during page switching */
1016 orig_work_buf
= map
->work_buf
;
1017 map
->work_buf
= map
->selector_work_buf
;
1019 ret
= _regmap_update_bits(map
, range
->selector_reg
,
1020 range
->selector_mask
,
1021 win_page
<< range
->selector_shift
,
1024 map
->work_buf
= orig_work_buf
;
1030 *reg
= range
->window_start
+ win_offset
;
1035 int _regmap_raw_write(struct regmap
*map
, unsigned int reg
,
1036 const void *val
, size_t val_len
, bool async
)
1038 struct regmap_range_node
*range
;
1039 unsigned long flags
;
1040 u8
*u8
= map
->work_buf
;
1041 void *work_val
= map
->work_buf
+ map
->format
.reg_bytes
+
1042 map
->format
.pad_bytes
;
1044 int ret
= -ENOTSUPP
;
1050 /* Check for unwritable registers before we start */
1051 if (map
->writeable_reg
)
1052 for (i
= 0; i
< val_len
/ map
->format
.val_bytes
; i
++)
1053 if (!map
->writeable_reg(map
->dev
,
1054 reg
+ (i
* map
->reg_stride
)))
1057 if (!map
->cache_bypass
&& map
->format
.parse_val
) {
1059 int val_bytes
= map
->format
.val_bytes
;
1060 for (i
= 0; i
< val_len
/ val_bytes
; i
++) {
1061 ival
= map
->format
.parse_val(val
+ (i
* val_bytes
));
1062 ret
= regcache_write(map
, reg
+ (i
* map
->reg_stride
),
1066 "Error in caching of register: %x ret: %d\n",
1071 if (map
->cache_only
) {
1072 map
->cache_dirty
= true;
1077 range
= _regmap_range_lookup(map
, reg
);
1079 int val_num
= val_len
/ map
->format
.val_bytes
;
1080 int win_offset
= (reg
- range
->range_min
) % range
->window_len
;
1081 int win_residue
= range
->window_len
- win_offset
;
1083 /* If the write goes beyond the end of the window split it */
1084 while (val_num
> win_residue
) {
1085 dev_dbg(map
->dev
, "Writing window %d/%zu\n",
1086 win_residue
, val_len
/ map
->format
.val_bytes
);
1087 ret
= _regmap_raw_write(map
, reg
, val
, win_residue
*
1088 map
->format
.val_bytes
, async
);
1093 val_num
-= win_residue
;
1094 val
+= win_residue
* map
->format
.val_bytes
;
1095 val_len
-= win_residue
* map
->format
.val_bytes
;
1097 win_offset
= (reg
- range
->range_min
) %
1099 win_residue
= range
->window_len
- win_offset
;
1102 ret
= _regmap_select_page(map
, ®
, range
, val_num
);
1107 map
->format
.format_reg(map
->work_buf
, reg
, map
->reg_shift
);
1109 u8
[0] |= map
->write_flag_mask
;
1111 if (async
&& map
->bus
->async_write
) {
1112 struct regmap_async
*async
= map
->bus
->async_alloc();
1116 trace_regmap_async_write_start(map
->dev
, reg
, val_len
);
1118 async
->work_buf
= kzalloc(map
->format
.buf_size
,
1119 GFP_KERNEL
| GFP_DMA
);
1120 if (!async
->work_buf
) {
1125 INIT_WORK(&async
->cleanup
, async_cleanup
);
1128 /* If the caller supplied the value we can use it safely. */
1129 memcpy(async
->work_buf
, map
->work_buf
, map
->format
.pad_bytes
+
1130 map
->format
.reg_bytes
+ map
->format
.val_bytes
);
1131 if (val
== work_val
)
1132 val
= async
->work_buf
+ map
->format
.pad_bytes
+
1133 map
->format
.reg_bytes
;
1135 spin_lock_irqsave(&map
->async_lock
, flags
);
1136 list_add_tail(&async
->list
, &map
->async_list
);
1137 spin_unlock_irqrestore(&map
->async_lock
, flags
);
1139 ret
= map
->bus
->async_write(map
->bus_context
, async
->work_buf
,
1140 map
->format
.reg_bytes
+
1141 map
->format
.pad_bytes
,
1142 val
, val_len
, async
);
1145 dev_err(map
->dev
, "Failed to schedule write: %d\n",
1148 spin_lock_irqsave(&map
->async_lock
, flags
);
1149 list_del(&async
->list
);
1150 spin_unlock_irqrestore(&map
->async_lock
, flags
);
1152 kfree(async
->work_buf
);
1159 trace_regmap_hw_write_start(map
->dev
, reg
,
1160 val_len
/ map
->format
.val_bytes
);
1162 /* If we're doing a single register write we can probably just
1163 * send the work_buf directly, otherwise try to do a gather
1166 if (val
== work_val
)
1167 ret
= map
->bus
->write(map
->bus_context
, map
->work_buf
,
1168 map
->format
.reg_bytes
+
1169 map
->format
.pad_bytes
+
1171 else if (map
->bus
->gather_write
)
1172 ret
= map
->bus
->gather_write(map
->bus_context
, map
->work_buf
,
1173 map
->format
.reg_bytes
+
1174 map
->format
.pad_bytes
,
1177 /* If that didn't work fall back on linearising by hand. */
1178 if (ret
== -ENOTSUPP
) {
1179 len
= map
->format
.reg_bytes
+ map
->format
.pad_bytes
+ val_len
;
1180 buf
= kzalloc(len
, GFP_KERNEL
);
1184 memcpy(buf
, map
->work_buf
, map
->format
.reg_bytes
);
1185 memcpy(buf
+ map
->format
.reg_bytes
+ map
->format
.pad_bytes
,
1187 ret
= map
->bus
->write(map
->bus_context
, buf
, len
);
1192 trace_regmap_hw_write_done(map
->dev
, reg
,
1193 val_len
/ map
->format
.val_bytes
);
1199 * regmap_can_raw_write - Test if regmap_raw_write() is supported
1201 * @map: Map to check.
1203 bool regmap_can_raw_write(struct regmap
*map
)
1205 return map
->bus
&& map
->format
.format_val
&& map
->format
.format_reg
;
1207 EXPORT_SYMBOL_GPL(regmap_can_raw_write
);
1209 static int _regmap_bus_formatted_write(void *context
, unsigned int reg
,
1213 struct regmap_range_node
*range
;
1214 struct regmap
*map
= context
;
1216 WARN_ON(!map
->bus
|| !map
->format
.format_write
);
1218 range
= _regmap_range_lookup(map
, reg
);
1220 ret
= _regmap_select_page(map
, ®
, range
, 1);
1225 map
->format
.format_write(map
, reg
, val
);
1227 trace_regmap_hw_write_start(map
->dev
, reg
, 1);
1229 ret
= map
->bus
->write(map
->bus_context
, map
->work_buf
,
1230 map
->format
.buf_size
);
1232 trace_regmap_hw_write_done(map
->dev
, reg
, 1);
1237 static int _regmap_bus_raw_write(void *context
, unsigned int reg
,
1240 struct regmap
*map
= context
;
1242 WARN_ON(!map
->bus
|| !map
->format
.format_val
);
1244 map
->format
.format_val(map
->work_buf
+ map
->format
.reg_bytes
1245 + map
->format
.pad_bytes
, val
, 0);
1246 return _regmap_raw_write(map
, reg
,
1248 map
->format
.reg_bytes
+
1249 map
->format
.pad_bytes
,
1250 map
->format
.val_bytes
, false);
1253 static inline void *_regmap_map_get_context(struct regmap
*map
)
1255 return (map
->bus
) ? map
: map
->bus_context
;
1258 int _regmap_write(struct regmap
*map
, unsigned int reg
,
1262 void *context
= _regmap_map_get_context(map
);
1264 if (!map
->cache_bypass
&& !map
->defer_caching
) {
1265 ret
= regcache_write(map
, reg
, val
);
1268 if (map
->cache_only
) {
1269 map
->cache_dirty
= true;
1275 if (strcmp(dev_name(map
->dev
), LOG_DEVICE
) == 0)
1276 dev_info(map
->dev
, "%x <= %x\n", reg
, val
);
1279 trace_regmap_reg_write(map
->dev
, reg
, val
);
1281 return map
->reg_write(context
, reg
, val
);
1285 * regmap_write(): Write a value to a single register
1287 * @map: Register map to write to
1288 * @reg: Register to write to
1289 * @val: Value to be written
1291 * A value of zero will be returned on success, a negative errno will
1292 * be returned in error cases.
1294 int regmap_write(struct regmap
*map
, unsigned int reg
, unsigned int val
)
1298 if (reg
% map
->reg_stride
)
1301 map
->lock(map
->lock_arg
);
1303 ret
= _regmap_write(map
, reg
, val
);
1305 map
->unlock(map
->lock_arg
);
1309 EXPORT_SYMBOL_GPL(regmap_write
);
1312 * regmap_raw_write(): Write raw values to one or more registers
1314 * @map: Register map to write to
1315 * @reg: Initial register to write to
1316 * @val: Block of data to be written, laid out for direct transmission to the
1318 * @val_len: Length of data pointed to by val.
1320 * This function is intended to be used for things like firmware
1321 * download where a large block of data needs to be transferred to the
1322 * device. No formatting will be done on the data provided.
1324 * A value of zero will be returned on success, a negative errno will
1325 * be returned in error cases.
1327 int regmap_raw_write(struct regmap
*map
, unsigned int reg
,
1328 const void *val
, size_t val_len
)
1332 if (!regmap_can_raw_write(map
))
1334 if (val_len
% map
->format
.val_bytes
)
1337 map
->lock(map
->lock_arg
);
1339 ret
= _regmap_raw_write(map
, reg
, val
, val_len
, false);
1341 map
->unlock(map
->lock_arg
);
1345 EXPORT_SYMBOL_GPL(regmap_raw_write
);
1348 * regmap_field_write(): Write a value to a single register field
1350 * @field: Register field to write to
1351 * @val: Value to be written
1353 * A value of zero will be returned on success, a negative errno will
1354 * be returned in error cases.
1356 int regmap_field_write(struct regmap_field
*field
, unsigned int val
)
1358 return regmap_update_bits(field
->regmap
, field
->reg
,
1359 field
->mask
, val
<< field
->shift
);
1361 EXPORT_SYMBOL_GPL(regmap_field_write
);
1364 * regmap_bulk_write(): Write multiple registers to the device
1366 * @map: Register map to write to
1367 * @reg: First register to be write from
1368 * @val: Block of data to be written, in native register size for device
1369 * @val_count: Number of registers to write
1371 * This function is intended to be used for writing a large block of
1372 * data to the device either in single transfer or multiple transfer.
1374 * A value of zero will be returned on success, a negative errno will
1375 * be returned in error cases.
1377 int regmap_bulk_write(struct regmap
*map
, unsigned int reg
, const void *val
,
1381 size_t val_bytes
= map
->format
.val_bytes
;
1386 if (!map
->format
.parse_inplace
)
1388 if (reg
% map
->reg_stride
)
1391 map
->lock(map
->lock_arg
);
1393 /* No formatting is require if val_byte is 1 */
1394 if (val_bytes
== 1) {
1397 wval
= kmemdup(val
, val_count
* val_bytes
, GFP_KERNEL
);
1400 dev_err(map
->dev
, "Error in memory allocation\n");
1403 for (i
= 0; i
< val_count
* val_bytes
; i
+= val_bytes
)
1404 map
->format
.parse_inplace(wval
+ i
);
1407 * Some devices does not support bulk write, for
1408 * them we have a series of single write operations.
1410 if (map
->use_single_rw
) {
1411 for (i
= 0; i
< val_count
; i
++) {
1412 ret
= regmap_raw_write(map
,
1413 reg
+ (i
* map
->reg_stride
),
1414 val
+ (i
* val_bytes
),
1420 ret
= _regmap_raw_write(map
, reg
, wval
, val_bytes
* val_count
,
1428 map
->unlock(map
->lock_arg
);
1431 EXPORT_SYMBOL_GPL(regmap_bulk_write
);
1434 * regmap_raw_write_async(): Write raw values to one or more registers
1437 * @map: Register map to write to
1438 * @reg: Initial register to write to
1439 * @val: Block of data to be written, laid out for direct transmission to the
1440 * device. Must be valid until regmap_async_complete() is called.
1441 * @val_len: Length of data pointed to by val.
1443 * This function is intended to be used for things like firmware
1444 * download where a large block of data needs to be transferred to the
1445 * device. No formatting will be done on the data provided.
1447 * If supported by the underlying bus the write will be scheduled
1448 * asynchronously, helping maximise I/O speed on higher speed buses
1449 * like SPI. regmap_async_complete() can be called to ensure that all
1450 * asynchrnous writes have been completed.
1452 * A value of zero will be returned on success, a negative errno will
1453 * be returned in error cases.
1455 int regmap_raw_write_async(struct regmap
*map
, unsigned int reg
,
1456 const void *val
, size_t val_len
)
1460 if (val_len
% map
->format
.val_bytes
)
1462 if (reg
% map
->reg_stride
)
1465 map
->lock(map
->lock_arg
);
1467 ret
= _regmap_raw_write(map
, reg
, val
, val_len
, true);
1469 map
->unlock(map
->lock_arg
);
1473 EXPORT_SYMBOL_GPL(regmap_raw_write_async
);
1475 static int _regmap_raw_read(struct regmap
*map
, unsigned int reg
, void *val
,
1476 unsigned int val_len
)
1478 struct regmap_range_node
*range
;
1479 u8
*u8
= map
->work_buf
;
1484 range
= _regmap_range_lookup(map
, reg
);
1486 ret
= _regmap_select_page(map
, ®
, range
,
1487 val_len
/ map
->format
.val_bytes
);
1492 map
->format
.format_reg(map
->work_buf
, reg
, map
->reg_shift
);
1495 * Some buses or devices flag reads by setting the high bits in the
1496 * register addresss; since it's always the high bits for all
1497 * current formats we can do this here rather than in
1498 * formatting. This may break if we get interesting formats.
1500 u8
[0] |= map
->read_flag_mask
;
1502 trace_regmap_hw_read_start(map
->dev
, reg
,
1503 val_len
/ map
->format
.val_bytes
);
1505 ret
= map
->bus
->read(map
->bus_context
, map
->work_buf
,
1506 map
->format
.reg_bytes
+ map
->format
.pad_bytes
,
1509 trace_regmap_hw_read_done(map
->dev
, reg
,
1510 val_len
/ map
->format
.val_bytes
);
1515 static int _regmap_bus_read(void *context
, unsigned int reg
,
1519 struct regmap
*map
= context
;
1521 if (!map
->format
.parse_val
)
1524 ret
= _regmap_raw_read(map
, reg
, map
->work_buf
, map
->format
.val_bytes
);
1526 *val
= map
->format
.parse_val(map
->work_buf
);
1531 static int _regmap_read(struct regmap
*map
, unsigned int reg
,
1535 void *context
= _regmap_map_get_context(map
);
1537 WARN_ON(!map
->reg_read
);
1539 if (!map
->cache_bypass
) {
1540 ret
= regcache_read(map
, reg
, val
);
1545 if (map
->cache_only
)
1548 ret
= map
->reg_read(context
, reg
, val
);
1551 if (strcmp(dev_name(map
->dev
), LOG_DEVICE
) == 0)
1552 dev_info(map
->dev
, "%x => %x\n", reg
, *val
);
1555 trace_regmap_reg_read(map
->dev
, reg
, *val
);
1557 if (!map
->cache_bypass
)
1558 regcache_write(map
, reg
, *val
);
1565 * regmap_read(): Read a value from a single register
1567 * @map: Register map to write to
1568 * @reg: Register to be read from
1569 * @val: Pointer to store read value
1571 * A value of zero will be returned on success, a negative errno will
1572 * be returned in error cases.
1574 int regmap_read(struct regmap
*map
, unsigned int reg
, unsigned int *val
)
1578 if (reg
% map
->reg_stride
)
1581 map
->lock(map
->lock_arg
);
1583 ret
= _regmap_read(map
, reg
, val
);
1585 map
->unlock(map
->lock_arg
);
1589 EXPORT_SYMBOL_GPL(regmap_read
);
1592 * regmap_raw_read(): Read raw data from the device
1594 * @map: Register map to write to
1595 * @reg: First register to be read from
1596 * @val: Pointer to store read value
1597 * @val_len: Size of data to read
1599 * A value of zero will be returned on success, a negative errno will
1600 * be returned in error cases.
1602 int regmap_raw_read(struct regmap
*map
, unsigned int reg
, void *val
,
1605 size_t val_bytes
= map
->format
.val_bytes
;
1606 size_t val_count
= val_len
/ val_bytes
;
1612 if (val_len
% map
->format
.val_bytes
)
1614 if (reg
% map
->reg_stride
)
1617 map
->lock(map
->lock_arg
);
1619 if (regmap_volatile_range(map
, reg
, val_count
) || map
->cache_bypass
||
1620 map
->cache_type
== REGCACHE_NONE
) {
1621 /* Physical block read if there's no cache involved */
1622 ret
= _regmap_raw_read(map
, reg
, val
, val_len
);
1625 /* Otherwise go word by word for the cache; should be low
1626 * cost as we expect to hit the cache.
1628 for (i
= 0; i
< val_count
; i
++) {
1629 ret
= _regmap_read(map
, reg
+ (i
* map
->reg_stride
),
1634 map
->format
.format_val(val
+ (i
* val_bytes
), v
, 0);
1639 map
->unlock(map
->lock_arg
);
1643 EXPORT_SYMBOL_GPL(regmap_raw_read
);
1646 * regmap_field_read(): Read a value to a single register field
1648 * @field: Register field to read from
1649 * @val: Pointer to store read value
1651 * A value of zero will be returned on success, a negative errno will
1652 * be returned in error cases.
1654 int regmap_field_read(struct regmap_field
*field
, unsigned int *val
)
1657 unsigned int reg_val
;
1658 ret
= regmap_read(field
->regmap
, field
->reg
, ®_val
);
1662 reg_val
&= field
->mask
;
1663 reg_val
>>= field
->shift
;
1668 EXPORT_SYMBOL_GPL(regmap_field_read
);
1671 * regmap_bulk_read(): Read multiple registers from the device
1673 * @map: Register map to write to
1674 * @reg: First register to be read from
1675 * @val: Pointer to store read value, in native register size for device
1676 * @val_count: Number of registers to read
1678 * A value of zero will be returned on success, a negative errno will
1679 * be returned in error cases.
1681 int regmap_bulk_read(struct regmap
*map
, unsigned int reg
, void *val
,
1685 size_t val_bytes
= map
->format
.val_bytes
;
1686 bool vol
= regmap_volatile_range(map
, reg
, val_count
);
1690 if (!map
->format
.parse_inplace
)
1692 if (reg
% map
->reg_stride
)
1695 if (vol
|| map
->cache_type
== REGCACHE_NONE
) {
1697 * Some devices does not support bulk read, for
1698 * them we have a series of single read operations.
1700 if (map
->use_single_rw
) {
1701 for (i
= 0; i
< val_count
; i
++) {
1702 ret
= regmap_raw_read(map
,
1703 reg
+ (i
* map
->reg_stride
),
1704 val
+ (i
* val_bytes
),
1710 ret
= regmap_raw_read(map
, reg
, val
,
1711 val_bytes
* val_count
);
1716 for (i
= 0; i
< val_count
* val_bytes
; i
+= val_bytes
)
1717 map
->format
.parse_inplace(val
+ i
);
1719 for (i
= 0; i
< val_count
; i
++) {
1721 ret
= regmap_read(map
, reg
+ (i
* map
->reg_stride
),
1725 memcpy(val
+ (i
* val_bytes
), &ival
, val_bytes
);
1731 EXPORT_SYMBOL_GPL(regmap_bulk_read
);
1733 static int _regmap_update_bits(struct regmap
*map
, unsigned int reg
,
1734 unsigned int mask
, unsigned int val
,
1738 unsigned int tmp
, orig
;
1740 ret
= _regmap_read(map
, reg
, &orig
);
1748 ret
= _regmap_write(map
, reg
, tmp
);
1758 * regmap_update_bits: Perform a read/modify/write cycle on the register map
1760 * @map: Register map to update
1761 * @reg: Register to update
1762 * @mask: Bitmask to change
1763 * @val: New value for bitmask
1765 * Returns zero for success, a negative number on error.
1767 int regmap_update_bits(struct regmap
*map
, unsigned int reg
,
1768 unsigned int mask
, unsigned int val
)
1773 map
->lock(map
->lock_arg
);
1774 ret
= _regmap_update_bits(map
, reg
, mask
, val
, &change
);
1775 map
->unlock(map
->lock_arg
);
1779 EXPORT_SYMBOL_GPL(regmap_update_bits
);
1782 * regmap_update_bits_check: Perform a read/modify/write cycle on the
1783 * register map and report if updated
1785 * @map: Register map to update
1786 * @reg: Register to update
1787 * @mask: Bitmask to change
1788 * @val: New value for bitmask
1789 * @change: Boolean indicating if a write was done
1791 * Returns zero for success, a negative number on error.
1793 int regmap_update_bits_check(struct regmap
*map
, unsigned int reg
,
1794 unsigned int mask
, unsigned int val
,
1799 map
->lock(map
->lock_arg
);
1800 ret
= _regmap_update_bits(map
, reg
, mask
, val
, change
);
1801 map
->unlock(map
->lock_arg
);
1804 EXPORT_SYMBOL_GPL(regmap_update_bits_check
);
1806 void regmap_async_complete_cb(struct regmap_async
*async
, int ret
)
1808 struct regmap
*map
= async
->map
;
1811 trace_regmap_async_io_complete(map
->dev
);
1813 spin_lock(&map
->async_lock
);
1815 list_del(&async
->list
);
1816 wake
= list_empty(&map
->async_list
);
1819 map
->async_ret
= ret
;
1821 spin_unlock(&map
->async_lock
);
1823 schedule_work(&async
->cleanup
);
1826 wake_up(&map
->async_waitq
);
1828 EXPORT_SYMBOL_GPL(regmap_async_complete_cb
);
1830 static int regmap_async_is_done(struct regmap
*map
)
1832 unsigned long flags
;
1835 spin_lock_irqsave(&map
->async_lock
, flags
);
1836 ret
= list_empty(&map
->async_list
);
1837 spin_unlock_irqrestore(&map
->async_lock
, flags
);
1843 * regmap_async_complete: Ensure all asynchronous I/O has completed.
1845 * @map: Map to operate on.
1847 * Blocks until any pending asynchronous I/O has completed. Returns
1848 * an error code for any failed I/O operations.
1850 int regmap_async_complete(struct regmap
*map
)
1852 unsigned long flags
;
1855 /* Nothing to do with no async support */
1856 if (!map
->bus
|| !map
->bus
->async_write
)
1859 trace_regmap_async_complete_start(map
->dev
);
1861 wait_event(map
->async_waitq
, regmap_async_is_done(map
));
1863 spin_lock_irqsave(&map
->async_lock
, flags
);
1864 ret
= map
->async_ret
;
1866 spin_unlock_irqrestore(&map
->async_lock
, flags
);
1868 trace_regmap_async_complete_done(map
->dev
);
1872 EXPORT_SYMBOL_GPL(regmap_async_complete
);
1875 * regmap_register_patch: Register and apply register updates to be applied
1876 * on device initialistion
1878 * @map: Register map to apply updates to.
1879 * @regs: Values to update.
1880 * @num_regs: Number of entries in regs.
1882 * Register a set of register updates to be applied to the device
1883 * whenever the device registers are synchronised with the cache and
1884 * apply them immediately. Typically this is used to apply
1885 * corrections to be applied to the device defaults on startup, such
1886 * as the updates some vendors provide to undocumented registers.
1888 int regmap_register_patch(struct regmap
*map
, const struct reg_default
*regs
,
1894 /* If needed the implementation can be extended to support this */
1898 map
->lock(map
->lock_arg
);
1900 bypass
= map
->cache_bypass
;
1902 map
->cache_bypass
= true;
1904 /* Write out first; it's useful to apply even if we fail later. */
1905 for (i
= 0; i
< num_regs
; i
++) {
1906 ret
= _regmap_write(map
, regs
[i
].reg
, regs
[i
].def
);
1908 dev_err(map
->dev
, "Failed to write %x = %x: %d\n",
1909 regs
[i
].reg
, regs
[i
].def
, ret
);
1914 map
->patch
= kcalloc(num_regs
, sizeof(struct reg_default
), GFP_KERNEL
);
1915 if (map
->patch
!= NULL
) {
1916 memcpy(map
->patch
, regs
,
1917 num_regs
* sizeof(struct reg_default
));
1918 map
->patch_regs
= num_regs
;
1924 map
->cache_bypass
= bypass
;
1926 map
->unlock(map
->lock_arg
);
1930 EXPORT_SYMBOL_GPL(regmap_register_patch
);
1933 * regmap_get_val_bytes(): Report the size of a register value
1935 * Report the size of a register value, mainly intended to for use by
1936 * generic infrastructure built on top of regmap.
1938 int regmap_get_val_bytes(struct regmap
*map
)
1940 if (map
->format
.format_write
)
1943 return map
->format
.val_bytes
;
1945 EXPORT_SYMBOL_GPL(regmap_get_val_bytes
);
1947 static int __init
regmap_initcall(void)
1949 regmap_debugfs_initcall();
1953 postcore_initcall(regmap_initcall
);