regmap: Add soundwire bus support
Add soundwire bus support to regmap. This change enables codec drivers using the soundwire hardware interface to use regmap interface for register read/write functionality. Change-Id: I503ba80401cd2f45fafc95e6c9da4e5b05c39ec4 Signed-off-by: Sudheer Papothi <spapothi@codeaurora.org>
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@ -3,7 +3,8 @@
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# subsystems should select the appropriate symbols.
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config REGMAP
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default y if (REGMAP_I2C || REGMAP_SPI || REGMAP_MMIO || REGMAP_IRQ)
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default y if (REGMAP_I2C || REGMAP_SPI || REGMAP_SPMI)
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default y if (REGMAP_MMIO || REGMAP_IRQ || REGMAP_SWR)
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select LZO_COMPRESS
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select LZO_DECOMPRESS
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select IRQ_DOMAIN if REGMAP_IRQ
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@ -5,3 +5,4 @@ obj-$(CONFIG_REGMAP_I2C) += regmap-i2c.o
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obj-$(CONFIG_REGMAP_SPI) += regmap-spi.o
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obj-$(CONFIG_REGMAP_MMIO) += regmap-mmio.o
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obj-$(CONFIG_REGMAP_IRQ) += regmap-irq.o
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obj-$(CONFIG_REGMAP_SWR) += regmap-swr.o
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@ -0,0 +1,118 @@
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/*
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* Copyright (c) 2015, The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/regmap.h>
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#include <linux/soundwire/soundwire.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include "internal.h"
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static int regmap_swr_gather_write(void *context,
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const void *reg, size_t reg_size,
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const void *val, size_t val_size)
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{
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struct device *dev = context;
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struct swr_device *swr = to_swr_device(dev);
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struct regmap *map = dev_get_regmap(dev, NULL);
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size_t addr_bytes = map->format.reg_bytes;
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int ret = 0;
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int i;
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u32 reg_addr = 0;
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if (swr == NULL) {
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dev_err(dev, "%s: swr device is NULL\n", __func__);
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return -EINVAL;
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}
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if (reg_size != addr_bytes) {
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dev_err(dev, "%s: reg size %zd bytes not supported\n",
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__func__, reg_size);
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return -EINVAL;
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}
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reg_addr = *(u16 *)reg;
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for (i = 0; i < val_size; i++) {
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ret = swr_write(swr, swr->dev_num, (reg_addr+i),
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(u32 *)(val+i));
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if (ret < 0) {
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dev_err(dev, "%s: write reg 0x%x failed, err %d\n",
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__func__, (reg_addr+i), ret);
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break;
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}
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}
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return ret;
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}
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static int regmap_swr_write(void *context, const void *data, size_t count)
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{
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struct device *dev = context;
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struct regmap *map = dev_get_regmap(dev, NULL);
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size_t addr_bytes = map->format.reg_bytes;
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WARN_ON(count < addr_bytes);
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return regmap_swr_gather_write(context, data, addr_bytes,
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(data + addr_bytes),
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(count - addr_bytes));
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}
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static int regmap_swr_read(void *context,
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const void *reg, size_t reg_size,
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void *val, size_t val_size)
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{
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struct device *dev = context;
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struct swr_device *swr = to_swr_device(dev);
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struct regmap *map = dev_get_regmap(dev, NULL);
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size_t addr_bytes = map->format.reg_bytes;
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int ret = 0;
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u32 reg_addr = 0;
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if (swr == NULL) {
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dev_err(dev, "%s: swr is NULL\n", __func__);
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return -EINVAL;
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}
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if (reg_size != addr_bytes) {
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dev_err(dev, "%s: register size %zd bytes not supported\n",
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__func__, reg_size);
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return -EINVAL;
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}
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reg_addr = *(u32 *)reg;
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ret = swr_read(swr, swr->dev_num, reg_addr, val, val_size);
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if (ret < 0)
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dev_err(dev, "%s: codec reg 0x%x read failed %d\n",
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__func__, reg_addr, ret);
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return ret;
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}
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static struct regmap_bus regmap_swr = {
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.write = regmap_swr_write,
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.gather_write = regmap_swr_gather_write,
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.read = regmap_swr_read,
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.reg_format_endian_default = REGMAP_ENDIAN_NATIVE,
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.val_format_endian_default = REGMAP_ENDIAN_NATIVE,
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};
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struct regmap *regmap_init_swr(struct swr_device *swr,
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const struct regmap_config *config)
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{
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return regmap_init(&swr->dev, ®map_swr, &swr->dev, config);
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}
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EXPORT_SYMBOL(regmap_init_swr);
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struct regmap *devm_regmap_init_swr(struct swr_device *swr,
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const struct regmap_config *config)
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{
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return devm_regmap_init(&swr->dev, ®map_swr, &swr->dev, config);
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}
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EXPORT_SYMBOL(devm_regmap_init_swr);
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MODULE_LICENSE("GPL v2");
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@ -25,6 +25,8 @@ struct irq_domain;
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struct spi_device;
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struct regmap;
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struct regmap_range_cfg;
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struct regmap_field;
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struct swr_device;
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/* An enum of all the supported cache types */
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enum regcache_type {
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@ -320,6 +322,8 @@ struct regmap *regmap_init_spi(struct spi_device *dev,
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struct regmap *regmap_init_mmio_clk(struct device *dev, const char *clk_id,
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void __iomem *regs,
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const struct regmap_config *config);
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struct regmap *regmap_init_swr(struct swr_device *dev,
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const struct regmap_config *config);
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struct regmap *devm_regmap_init(struct device *dev,
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const struct regmap_bus *bus,
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@ -332,6 +336,8 @@ struct regmap *devm_regmap_init_spi(struct spi_device *dev,
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struct regmap *devm_regmap_init_mmio_clk(struct device *dev, const char *clk_id,
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void __iomem *regs,
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const struct regmap_config *config);
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struct regmap *devm_regmap_init_swr(struct swr_device *dev,
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const struct regmap_config *config);
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/**
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* regmap_init_mmio(): Initialise register map
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