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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2016-09-11 04:34:46 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2016-09-11 04:34:46 -0300
commit863981e96738983919de841ec669e157e6bdaeb0 (patch)
treed6d89a12e7eb8017837c057935a2271290907f76 /drivers/misc/eeprom/at24.c
parent8dec7c70575785729a6a9e6719a955e9c545bcab (diff)
Linux-libre 4.7.1-gnupck-4.7.1-gnu
Diffstat (limited to 'drivers/misc/eeprom/at24.c')
-rw-r--r--drivers/misc/eeprom/at24.c112
1 files changed, 24 insertions, 88 deletions
diff --git a/drivers/misc/eeprom/at24.c b/drivers/misc/eeprom/at24.c
index 089d6943f..9ceb63b62 100644
--- a/drivers/misc/eeprom/at24.c
+++ b/drivers/misc/eeprom/at24.c
@@ -23,7 +23,6 @@
#include <linux/acpi.h>
#include <linux/i2c.h>
#include <linux/nvmem-provider.h>
-#include <linux/regmap.h>
#include <linux/platform_data/at24.h>
/*
@@ -69,7 +68,6 @@ struct at24_data {
unsigned write_max;
unsigned num_addresses;
- struct regmap_config regmap_config;
struct nvmem_config nvmem_config;
struct nvmem_device *nvmem;
@@ -245,17 +243,16 @@ static ssize_t at24_eeprom_read(struct at24_data *at24, char *buf,
if (status == count)
return count;
- /* REVISIT: at HZ=100, this is sloooow */
- msleep(1);
+ usleep_range(1000, 1500);
} while (time_before(read_time, timeout));
return -ETIMEDOUT;
}
-static ssize_t at24_read(struct at24_data *at24,
- char *buf, loff_t off, size_t count)
+static int at24_read(void *priv, unsigned int off, void *val, size_t count)
{
- ssize_t retval = 0;
+ struct at24_data *at24 = priv;
+ char *buf = val;
if (unlikely(!count))
return count;
@@ -267,23 +264,21 @@ static ssize_t at24_read(struct at24_data *at24,
mutex_lock(&at24->lock);
while (count) {
- ssize_t status;
+ int status;
status = at24_eeprom_read(at24, buf, off, count);
- if (status <= 0) {
- if (retval == 0)
- retval = status;
- break;
+ if (status < 0) {
+ mutex_unlock(&at24->lock);
+ return status;
}
buf += status;
off += status;
count -= status;
- retval += status;
}
mutex_unlock(&at24->lock);
- return retval;
+ return 0;
}
/*
@@ -365,20 +360,19 @@ static ssize_t at24_eeprom_write(struct at24_data *at24, const char *buf,
if (status == count)
return count;
- /* REVISIT: at HZ=100, this is sloooow */
- msleep(1);
+ usleep_range(1000, 1500);
} while (time_before(write_time, timeout));
return -ETIMEDOUT;
}
-static ssize_t at24_write(struct at24_data *at24, const char *buf, loff_t off,
- size_t count)
+static int at24_write(void *priv, unsigned int off, void *val, size_t count)
{
- ssize_t retval = 0;
+ struct at24_data *at24 = priv;
+ char *buf = val;
if (unlikely(!count))
- return count;
+ return -EINVAL;
/*
* Write data to chip, protecting against concurrent updates
@@ -387,70 +381,23 @@ static ssize_t at24_write(struct at24_data *at24, const char *buf, loff_t off,
mutex_lock(&at24->lock);
while (count) {
- ssize_t status;
+ int status;
status = at24_eeprom_write(at24, buf, off, count);
- if (status <= 0) {
- if (retval == 0)
- retval = status;
- break;
+ if (status < 0) {
+ mutex_unlock(&at24->lock);
+ return status;
}
buf += status;
off += status;
count -= status;
- retval += status;
}
mutex_unlock(&at24->lock);
- return retval;
-}
-
-/*-------------------------------------------------------------------------*/
-
-/*
- * Provide a regmap interface, which is registered with the NVMEM
- * framework
-*/
-static int at24_regmap_read(void *context, const void *reg, size_t reg_size,
- void *val, size_t val_size)
-{
- struct at24_data *at24 = context;
- off_t offset = *(u32 *)reg;
- int err;
-
- err = at24_read(at24, val, offset, val_size);
- if (err)
- return err;
return 0;
}
-static int at24_regmap_write(void *context, const void *data, size_t count)
-{
- struct at24_data *at24 = 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 = at24_write(at24, buf, offset, len);
- if (err)
- return err;
- return 0;
-}
-
-static const struct regmap_bus at24_regmap_bus = {
- .read = at24_regmap_read,
- .write = at24_regmap_write,
- .reg_format_endian_default = REGMAP_ENDIAN_NATIVE,
-};
-
-/*-------------------------------------------------------------------------*/
-
#ifdef CONFIG_OF
static void at24_get_ofdata(struct i2c_client *client,
struct at24_platform_data *chip)
@@ -482,7 +429,6 @@ static int at24_probe(struct i2c_client *client, const struct i2c_device_id *id)
struct at24_data *at24;
int err;
unsigned i, num_addresses;
- struct regmap *regmap;
if (client->dev.platform_data) {
chip = *(struct at24_platform_data *)client->dev.platform_data;
@@ -544,10 +490,7 @@ static int at24_probe(struct i2c_client *client, const struct i2c_device_id *id)
} else {
return -EPFNOSUPPORT;
}
- }
- /* Use I2C operations unless we're stuck with SMBus extensions. */
- if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
if (i2c_check_functionality(client->adapter,
I2C_FUNC_SMBUS_WRITE_I2C_BLOCK)) {
use_smbus_write = I2C_SMBUS_I2C_BLOCK_DATA;
@@ -612,19 +555,6 @@ static int at24_probe(struct i2c_client *client, const struct i2c_device_id *id)
}
}
- at24->regmap_config.reg_bits = 32;
- at24->regmap_config.val_bits = 8;
- at24->regmap_config.reg_stride = 1;
- at24->regmap_config.max_register = chip.byte_len - 1;
-
- regmap = devm_regmap_init(&client->dev, &at24_regmap_bus, at24,
- &at24->regmap_config);
- if (IS_ERR(regmap)) {
- dev_err(&client->dev, "regmap init failed\n");
- err = PTR_ERR(regmap);
- goto err_clients;
- }
-
at24->nvmem_config.name = dev_name(&client->dev);
at24->nvmem_config.dev = &client->dev;
at24->nvmem_config.read_only = !writable;
@@ -632,6 +562,12 @@ static int at24_probe(struct i2c_client *client, const struct i2c_device_id *id)
at24->nvmem_config.owner = THIS_MODULE;
at24->nvmem_config.compat = true;
at24->nvmem_config.base_dev = &client->dev;
+ at24->nvmem_config.reg_read = at24_read;
+ at24->nvmem_config.reg_write = at24_write;
+ at24->nvmem_config.priv = at24;
+ at24->nvmem_config.stride = 4;
+ at24->nvmem_config.word_size = 1;
+ at24->nvmem_config.size = chip.byte_len;
at24->nvmem = nvmem_register(&at24->nvmem_config);