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/*
* Copyright (c) 2015-2016, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/device.h>
#include <linux/slab.h>
#include <linux/mutex.h>
#include <linux/regmap.h>
#include <linux/soundwire/soundwire.h>
#include <linux/module.h>
#include <linux/init.h>
#include "internal.h"
static int regmap_swr_gather_write(void *context,
const void *reg, size_t reg_size,
const void *val, size_t val_len)
{
struct device *dev = context;
struct swr_device *swr = to_swr_device(dev);
struct regmap *map = dev_get_regmap(dev, NULL);
size_t addr_bytes;
size_t val_bytes;
int i, ret = 0;
u16 reg_addr = 0;
if (map == NULL) {
dev_err(dev, "%s: regmap is NULL\n", __func__);
return -EINVAL;
}
addr_bytes = map->format.reg_bytes;
if (swr == NULL) {
dev_err(dev, "%s: swr device is NULL\n", __func__);
return -EINVAL;
}
if (reg_size != addr_bytes) {
dev_err(dev, "%s: reg size %zd bytes not supported\n",
__func__, reg_size);
return -EINVAL;
}
reg_addr = *(u16 *)reg;
val_bytes = map->format.val_bytes;
/* val_len = val_bytes * val_count */
for (i = 0; i < (val_len / val_bytes); i++) {
reg_addr = reg_addr + i;
val = (u8 *)val + (val_bytes * i);
ret = swr_write(swr, swr->dev_num, reg_addr, val);
if (ret < 0) {
dev_err(dev, "%s: write reg 0x%x failed, err %d\n",
__func__, reg_addr, ret);
break;
}
}
return ret;
}
static int regmap_swr_raw_multi_reg_write(void *context, const void *data,
size_t count)
{
struct device *dev = context;
struct swr_device *swr = to_swr_device(dev);
struct regmap *map = dev_get_regmap(dev, NULL);
size_t addr_bytes;
size_t val_bytes;
size_t pad_bytes;
size_t num_regs;
int i = 0;
int ret = 0;
u16 *reg;
u8 *val;
u8 *buf;
if (swr == NULL) {
dev_err(dev, "%s: swr device is NULL\n", __func__);
return -EINVAL;
}
if (map == NULL) {
dev_err(dev, "%s: regmap is NULL\n", __func__);
return -EINVAL;
}
addr_bytes = map->format.reg_bytes;
val_bytes = map->format.val_bytes;
pad_bytes = map->format.pad_bytes;
if (addr_bytes + val_bytes + pad_bytes == 0) {
dev_err(dev, "%s: sum of addr, value and pad is 0\n", __func__);
return -EINVAL;
}
num_regs = count / (addr_bytes + val_bytes + pad_bytes);
reg = kcalloc(num_regs, sizeof(u16), GFP_KERNEL);
if (!reg)
return -ENOMEM;
val = kcalloc(num_regs, sizeof(u8), GFP_KERNEL);
if (!val) {
ret = -ENOMEM;
goto mem_fail;
}
buf = (u8 *)data;
for (i = 0; i < num_regs; i++) {
reg[i] = *(u16 *)buf;
buf += (map->format.reg_bytes + map->format.pad_bytes);
val[i] = *buf;
buf += map->format.val_bytes;
}
ret = swr_bulk_write(swr, swr->dev_num, reg, val, num_regs);
if (ret)
dev_err(dev, "%s: multi reg write failed\n", __func__);
kfree(val);
mem_fail:
kfree(reg);
return ret;
}
static int regmap_swr_write(void *context, const void *data, size_t count)
{
struct device *dev = context;
struct regmap *map = dev_get_regmap(dev, NULL);
size_t addr_bytes;
size_t val_bytes;
size_t pad_bytes;
if (map == NULL) {
dev_err(dev, "%s: regmap is NULL\n", __func__);
return -EINVAL;
}
addr_bytes = map->format.reg_bytes;
val_bytes = map->format.val_bytes;
pad_bytes = map->format.pad_bytes;
WARN_ON(count < addr_bytes);
if (count > (addr_bytes + val_bytes + pad_bytes))
return regmap_swr_raw_multi_reg_write(context, data, count);
else
return regmap_swr_gather_write(context, data, addr_bytes,
(data + addr_bytes),
(count - addr_bytes));
}
static int regmap_swr_read(void *context,
const void *reg, size_t reg_size,
void *val, size_t val_size)
{
struct device *dev = context;
struct swr_device *swr = to_swr_device(dev);
struct regmap *map = dev_get_regmap(dev, NULL);
size_t addr_bytes;
int ret = 0;
u16 reg_addr = 0;
if (map == NULL) {
dev_err(dev, "%s: regmap is NULL\n", __func__);
return -EINVAL;
}
addr_bytes = map->format.reg_bytes;
if (swr == NULL) {
dev_err(dev, "%s: swr is NULL\n", __func__);
return -EINVAL;
}
if (reg_size != addr_bytes) {
dev_err(dev, "%s: register size %zd bytes not supported\n",
__func__, reg_size);
return -EINVAL;
}
reg_addr = *(u16 *)reg;
ret = swr_read(swr, swr->dev_num, reg_addr, val, val_size);
if (ret < 0)
dev_err(dev, "%s: codec reg 0x%x read failed %d\n",
__func__, reg_addr, ret);
return ret;
}
static struct regmap_bus regmap_swr = {
.write = regmap_swr_write,
.gather_write = regmap_swr_gather_write,
.read = regmap_swr_read,
.reg_format_endian_default = REGMAP_ENDIAN_NATIVE,
.val_format_endian_default = REGMAP_ENDIAN_NATIVE,
};
struct regmap *__regmap_init_swr(struct swr_device *swr,
const struct regmap_config *config,
struct lock_class_key *lock_key,
const char *lock_name)
{
return __regmap_init(&swr->dev, ®map_swr, &swr->dev, config,
lock_key, lock_name);
}
EXPORT_SYMBOL(__regmap_init_swr);
struct regmap *__devm_regmap_init_swr(struct swr_device *swr,
const struct regmap_config *config,
struct lock_class_key *lock_key,
const char *lock_name)
{
return __devm_regmap_init(&swr->dev, ®map_swr, &swr->dev, config,
lock_key, lock_name);
}
EXPORT_SYMBOL(__devm_regmap_init_swr);
MODULE_LICENSE("GPL v2");
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