On Mon, May 02, 2016 at 09:32:54AM +0200, Wolfram Sang wrote:

On Sun, Apr 24, 2016 at 08:28:06PM +0100, Srinivas Kandagatla wrote:

quoted

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

Signed-off-by: Srinivas Kandagatla <redacted>

Andrew, since you did the NVMEM implementation, could you have a look at
this? That would be awesome. Thanks!

quoted

---
 drivers/misc/eeprom/Kconfig |   1 -
 drivers/misc/eeprom/at24.c  | 103 ++++++++++----------------------------------
 2 files changed, 22 insertions(+), 82 deletions(-)

diff --git a/drivers/misc/eeprom/Kconfig b/drivers/misc/eeprom/Kconfig
index cfc493c..2d70464 100644
--- a/drivers/misc/eeprom/Kconfig
+++ b/drivers/misc/eeprom/Kconfig

@@ -3,7 +3,6 @@ menu "EEPROM support"
 config EEPROM_AT24
 	tristate "I2C EEPROMs / RAMs / ROMs from most vendors"
 	depends on I2C && SYSFS
-	select REGMAP
 	select NVMEM
 	help
 	  Enable this driver to get read/write support to most I2C EEPROMs

diff --git a/drivers/misc/eeprom/at24.c b/drivers/misc/eeprom/at24.c
index 089d694..de550a6 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;
 

@@ -252,10 +250,10 @@ static ssize_t at24_eeprom_read(struct at24_data *at24, char *buf,
 	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 +265,21 @@ 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);

Since the patch replaces ssize_t with int here, it would also make
sense to do the same to at24_eeprom_read and at24_eeprom_write. Either
use ssize_t everywhere or nowhere.

      Andrew