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eeprom: at25: remove nvmem regmap dependency 

This patch moves to nvmem support in the driver to use callback instead
of regmap.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Srinivas Kandagatla 2016-04-24 20:28:07 +01:00 committed by Greg Kroah-Hartman
parent cf0361a2d2
commit 01973a01f9
2 changed files with 19 additions and 71 deletions
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1
drivers/misc/eeprom/Kconfig
View File

@ -31,7 +31,6 @@ config EEPROM_AT24
config EEPROM_AT25
tristate "SPI EEPROMs from most vendors"
depends on SPI && SYSFS
select REGMAP
select NVMEM
help
Enable this driver to get read/write support to most SPI EEPROMs,

89
drivers/misc/eeprom/at25.c
View File

@ -17,7 +17,6 @@
#include <linux/sched.h>
#include <linux/nvmem-provider.h>
#include <linux/regmap.h>
#include <linux/spi/spi.h>
#include <linux/spi/eeprom.h>
#include <linux/property.h>
@ -34,7 +33,6 @@ struct at25_data {
struct mutex lock;
struct spi_eeprom chip;
unsigned addrlen;
struct regmap_config regmap_config;
struct nvmem_config nvmem_config;
struct nvmem_device *nvmem;
};
@ -65,14 +63,11 @@ struct at25_data {
#define io_limit PAGE_SIZE /* bytes */
static ssize_t
at25_ee_read(
struct at25_data *at25,
char *buf,
unsigned offset,
size_t count
)
static int at25_ee_read(void *priv, unsigned int offset,
void *val, size_t count)
{
struct at25_data *at25 = priv;
char *buf = val;
u8 command[EE_MAXADDRLEN + 1];
u8 *cp;
ssize_t status;
@ -81,11 +76,11 @@ at25_ee_read(
u8 instr;
if (unlikely(offset >= at25->chip.byte_len))
return 0;
return -EINVAL;
if ((offset + count) > at25->chip.byte_len)
count = at25->chip.byte_len - offset;
if (unlikely(!count))
return count;
return -EINVAL;
cp = command;
@ -131,28 +126,14 @@ at25_ee_read(
count, offset, (int) status);
mutex_unlock(&at25->lock);
return status ? status : count;
return status;
}
static int at25_regmap_read(void *context, const void *reg, size_t reg_size,
void *val, size_t val_size)
static int at25_ee_write(void *priv, unsigned int off, void *val, size_t count)
{
struct at25_data *at25 = context;
off_t offset = *(u32 *)reg;
int err;
err = at25_ee_read(at25, val, offset, val_size);
if (err)
return err;
return 0;
}
static ssize_t
at25_ee_write(struct at25_data *at25, const char *buf, loff_t off,
size_t count)
{
ssize_t status = 0;
unsigned written = 0;
struct at25_data *at25 = priv;
const char *buf = val;
int status = 0;
unsigned buf_size;
u8 *bounce;
@ -161,7 +142,7 @@ at25_ee_write(struct at25_data *at25, const char *buf, loff_t off,
if ((off + count) > at25->chip.byte_len)
count = at25->chip.byte_len - off;
if (unlikely(!count))
return count;
return -EINVAL;
/* Temp buffer starts with command and address */
buf_size = at25->chip.page_size;
@ -256,40 +237,15 @@ at25_ee_write(struct at25_data *at25, const char *buf, loff_t off,
off += segment;
buf += segment;
count -= segment;
written += segment;
} while (count > 0);
mutex_unlock(&at25->lock);
kfree(bounce);
return written ? written : status;
return status;
}
static int at25_regmap_write(void *context, const void *data, size_t count)
{
struct at25_data *at25 = context;
const char *buf;
u32 offset;
size_t len;
int err;
memcpy(&offset, data, sizeof(offset));
buf = (const char *)data + sizeof(offset);
len = count - sizeof(offset);
err = at25_ee_write(at25, buf, offset, len);
if (err)
return err;
return 0;
}
static const struct regmap_bus at25_regmap_bus = {
.read = at25_regmap_read,
.write = at25_regmap_write,
.reg_format_endian_default = REGMAP_ENDIAN_NATIVE,
};
/*-------------------------------------------------------------------------*/
static int at25_fw_to_chip(struct device *dev, struct spi_eeprom *chip)
@ -349,7 +305,6 @@ static int at25_probe(struct spi_device *spi)
{
struct at25_data *at25 = NULL;
struct spi_eeprom chip;
struct regmap *regmap;
int err;
int sr;
int addrlen;
@ -394,18 +349,6 @@ static int at25_probe(struct spi_device *spi)
spi_set_drvdata(spi, at25);
at25->addrlen = addrlen;
at25->regmap_config.reg_bits = 32;
at25->regmap_config.val_bits = 8;
at25->regmap_config.reg_stride = 1;
at25->regmap_config.max_register = chip.byte_len - 1;
regmap = devm_regmap_init(&spi->dev, &at25_regmap_bus, at25,
&at25->regmap_config);
if (IS_ERR(regmap)) {
dev_err(&spi->dev, "regmap init failed\n");
return PTR_ERR(regmap);
}
at25->nvmem_config.name = dev_name(&spi->dev);
at25->nvmem_config.dev = &spi->dev;
at25->nvmem_config.read_only = chip.flags & EE_READONLY;
@ -413,6 +356,12 @@ static int at25_probe(struct spi_device *spi)
at25->nvmem_config.owner = THIS_MODULE;
at25->nvmem_config.compat = true;
at25->nvmem_config.base_dev = &spi->dev;
at25->nvmem_config.reg_read = at25_ee_read;
at25->nvmem_config.reg_write = at25_ee_write;
at25->nvmem_config.priv = at25;
at25->nvmem_config.stride = 4;
at25->nvmem_config.word_size = 1;
at25->nvmem_config.size = chip.byte_len;
at25->nvmem = nvmem_register(&at25->nvmem_config);
if (IS_ERR(at25->nvmem))