1/*
  2 * Register map access API - SPI support
  3 *
  4 * Copyright 2011 Wolfson Microelectronics plc
  5 *
  6 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
  7 *
  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.
 11 */
 12
 13#include <linux/regmap.h>
 14#include <linux/spi/spi.h>
 15#include <linux/module.h>
 16
 17#include "internal.h"
 18
 19struct regmap_async_spi {
 20	struct regmap_async core;
 21	struct spi_message m;
 22	struct spi_transfer t[2];
 23};
 24
 25static void regmap_spi_complete(void *data)
 26{
 27	struct regmap_async_spi *async = data;
 28
 29	regmap_async_complete_cb(&async->core, async->m.status);
 30}
 31
 32static int regmap_spi_write(void *context, const void *data, size_t count)
 33{
 34	struct device *dev = context;
 35	struct spi_device *spi = to_spi_device(dev);
 36
 37	return spi_write(spi, data, count);
 38}
 39
 40static int regmap_spi_gather_write(void *context,
 41				   const void *reg, size_t reg_len,
 42				   const void *val, size_t val_len)
 43{
 44	struct device *dev = context;
 45	struct spi_device *spi = to_spi_device(dev);
 46	struct spi_message m;
 47	struct spi_transfer t[2] = { { .tx_buf = reg, .len = reg_len, },
 48				     { .tx_buf = val, .len = val_len, }, };
 49
 50	spi_message_init(&m);
 51	spi_message_add_tail(&t[0], &m);
 52	spi_message_add_tail(&t[1], &m);
 53
 54	return spi_sync(spi, &m);
 55}
 56
 57static int regmap_spi_async_write(void *context,
 58				  const void *reg, size_t reg_len,
 59				  const void *val, size_t val_len,
 60				  struct regmap_async *a)
 61{
 62	struct regmap_async_spi *async = container_of(a,
 63						      struct regmap_async_spi,
 64						      core);
 65	struct device *dev = context;
 66	struct spi_device *spi = to_spi_device(dev);
 67
 68	async->t[0].tx_buf = reg;
 69	async->t[0].len = reg_len;
 70	async->t[1].tx_buf = val;
 71	async->t[1].len = val_len;
 72
 73	spi_message_init(&async->m);
 74	spi_message_add_tail(&async->t[0], &async->m);
 75	if (val)
 76		spi_message_add_tail(&async->t[1], &async->m);
 77
 78	async->m.complete = regmap_spi_complete;
 79	async->m.context = async;
 80
 81	return spi_async(spi, &async->m);
 82}
 83
 84static struct regmap_async *regmap_spi_async_alloc(void)
 85{
 86	struct regmap_async_spi *async_spi;
 87
 88	async_spi = kzalloc(sizeof(*async_spi), GFP_KERNEL);
 89	if (!async_spi)
 90		return NULL;
 91
 92	return &async_spi->core;
 93}
 94
 95static int regmap_spi_read(void *context,
 96			   const void *reg, size_t reg_size,
 97			   void *val, size_t val_size)
 98{
 99	struct device *dev = context;
100	struct spi_device *spi = to_spi_device(dev);
101
102	return spi_write_then_read(spi, reg, reg_size, val, val_size);
103}
104
105static struct regmap_bus regmap_spi = {
106	.write = regmap_spi_write,
107	.gather_write = regmap_spi_gather_write,
108	.async_write = regmap_spi_async_write,
109	.async_alloc = regmap_spi_async_alloc,
110	.read = regmap_spi_read,
111	.read_flag_mask = 0x80,
 
 
112};
113
114/**
115 * regmap_init_spi(): Initialise register map
116 *
117 * @spi: Device that will be interacted with
118 * @config: Configuration for register map
119 *
120 * The return value will be an ERR_PTR() on error or a valid pointer to
121 * a struct regmap.
122 */
123struct regmap *regmap_init_spi(struct spi_device *spi,
124			       const struct regmap_config *config)
125{
126	return regmap_init(&spi->dev, &regmap_spi, &spi->dev, config);
127}
128EXPORT_SYMBOL_GPL(regmap_init_spi);
129
130/**
131 * devm_regmap_init_spi(): Initialise register map
132 *
133 * @spi: Device that will be interacted with
134 * @config: Configuration for register map
135 *
136 * The return value will be an ERR_PTR() on error or a valid pointer
137 * to a struct regmap.  The map will be automatically freed by the
138 * device management code.
139 */
140struct regmap *devm_regmap_init_spi(struct spi_device *spi,
141				    const struct regmap_config *config)
142{
143	return devm_regmap_init(&spi->dev, &regmap_spi, &spi->dev, config);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
144}
145EXPORT_SYMBOL_GPL(devm_regmap_init_spi);
146
147MODULE_LICENSE("GPL");

  1// SPDX-License-Identifier: GPL-2.0
  2//
  3// Register map access API - SPI support
  4//
  5// Copyright 2011 Wolfson Microelectronics plc
  6//
  7// Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
 
 
 
 
  8
  9#include <linux/regmap.h>
 10#include <linux/spi/spi.h>
 11#include <linux/module.h>
 12
 13#include "internal.h"
 14
 15struct regmap_async_spi {
 16	struct regmap_async core;
 17	struct spi_message m;
 18	struct spi_transfer t[2];
 19};
 20
 21static void regmap_spi_complete(void *data)
 22{
 23	struct regmap_async_spi *async = data;
 24
 25	regmap_async_complete_cb(&async->core, async->m.status);
 26}
 27
 28static int regmap_spi_write(void *context, const void *data, size_t count)
 29{
 30	struct device *dev = context;
 31	struct spi_device *spi = to_spi_device(dev);
 32
 33	return spi_write(spi, data, count);
 34}
 35
 36static int regmap_spi_gather_write(void *context,
 37				   const void *reg, size_t reg_len,
 38				   const void *val, size_t val_len)
 39{
 40	struct device *dev = context;
 41	struct spi_device *spi = to_spi_device(dev);
 42	struct spi_message m;
 43	struct spi_transfer t[2] = { { .tx_buf = reg, .len = reg_len, },
 44				     { .tx_buf = val, .len = val_len, }, };
 45
 46	spi_message_init(&m);
 47	spi_message_add_tail(&t[0], &m);
 48	spi_message_add_tail(&t[1], &m);
 49
 50	return spi_sync(spi, &m);
 51}
 52
 53static int regmap_spi_async_write(void *context,
 54				  const void *reg, size_t reg_len,
 55				  const void *val, size_t val_len,
 56				  struct regmap_async *a)
 57{
 58	struct regmap_async_spi *async = container_of(a,
 59						      struct regmap_async_spi,
 60						      core);
 61	struct device *dev = context;
 62	struct spi_device *spi = to_spi_device(dev);
 63
 64	async->t[0].tx_buf = reg;
 65	async->t[0].len = reg_len;
 66	async->t[1].tx_buf = val;
 67	async->t[1].len = val_len;
 68
 69	spi_message_init(&async->m);
 70	spi_message_add_tail(&async->t[0], &async->m);
 71	if (val)
 72		spi_message_add_tail(&async->t[1], &async->m);
 73
 74	async->m.complete = regmap_spi_complete;
 75	async->m.context = async;
 76
 77	return spi_async(spi, &async->m);
 78}
 79
 80static struct regmap_async *regmap_spi_async_alloc(void)
 81{
 82	struct regmap_async_spi *async_spi;
 83
 84	async_spi = kzalloc(sizeof(*async_spi), GFP_KERNEL);
 85	if (!async_spi)
 86		return NULL;
 87
 88	return &async_spi->core;
 89}
 90
 91static int regmap_spi_read(void *context,
 92			   const void *reg, size_t reg_size,
 93			   void *val, size_t val_size)
 94{
 95	struct device *dev = context;
 96	struct spi_device *spi = to_spi_device(dev);
 97
 98	return spi_write_then_read(spi, reg, reg_size, val, val_size);
 99}
100
101static const struct regmap_bus regmap_spi = {
102	.write = regmap_spi_write,
103	.gather_write = regmap_spi_gather_write,
104	.async_write = regmap_spi_async_write,
105	.async_alloc = regmap_spi_async_alloc,
106	.read = regmap_spi_read,
107	.read_flag_mask = 0x80,
108	.reg_format_endian_default = REGMAP_ENDIAN_BIG,
109	.val_format_endian_default = REGMAP_ENDIAN_BIG,
110};
111
112static const struct regmap_bus *regmap_get_spi_bus(struct spi_device *spi,
113						   const struct regmap_config *config)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
114{
115	size_t max_size = spi_max_transfer_size(spi);
116	size_t max_msg_size, reg_reserve_size;
117	struct regmap_bus *bus;
118
119	if (max_size != SIZE_MAX) {
120		bus = kmemdup(&regmap_spi, sizeof(*bus), GFP_KERNEL);
121		if (!bus)
122			return ERR_PTR(-ENOMEM);
123
124		max_msg_size = spi_max_message_size(spi);
125		reg_reserve_size = config->reg_bits / BITS_PER_BYTE
126				 + config->pad_bits / BITS_PER_BYTE;
127		if (max_size + reg_reserve_size > max_msg_size)
128			max_size -= reg_reserve_size;
129
130		bus->free_on_exit = true;
131		bus->max_raw_read = max_size;
132		bus->max_raw_write = max_size;
133
134		return bus;
135	}
136
137	return &regmap_spi;
138}
139
140struct regmap *__regmap_init_spi(struct spi_device *spi,
141				 const struct regmap_config *config,
142				 struct lock_class_key *lock_key,
143				 const char *lock_name)
144{
145	const struct regmap_bus *bus = regmap_get_spi_bus(spi, config);
146
147	if (IS_ERR(bus))
148		return ERR_CAST(bus);
149
150	return __regmap_init(&spi->dev, bus, &spi->dev, config, lock_key, lock_name);
151}
152EXPORT_SYMBOL_GPL(__regmap_init_spi);
153
154struct regmap *__devm_regmap_init_spi(struct spi_device *spi,
155				      const struct regmap_config *config,
156				      struct lock_class_key *lock_key,
157				      const char *lock_name)
158{
159	const struct regmap_bus *bus = regmap_get_spi_bus(spi, config);
160
161	if (IS_ERR(bus))
162		return ERR_CAST(bus);
163
164	return __devm_regmap_init(&spi->dev, bus, &spi->dev, config, lock_key, lock_name);
165}
166EXPORT_SYMBOL_GPL(__devm_regmap_init_spi);
167
168MODULE_LICENSE("GPL");