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misc: at24: replace memory_accessor with nvmem_device_read

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Now that the AT24 uses the NVMEM framework, replace the
memory_accessor in the setup() callback with nvmem API calls.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Acked-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Tested-by: Sekhar Nori <nsekhar@ti.com>
Acked-by: Wolfram Sang <wsa@the-dreams.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Andrew Lunn 2016-02-26 20:59:24 +01:00 committed by Greg Kroah-Hartman
parent 1c4b6e2c75
commit bec3c11bad
6 changed files with 13 additions and 52 deletions
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5
arch/arm/mach-davinci/board-mityomapl138.c
View file

@ -115,13 +115,14 @@ static void mityomapl138_cpufreq_init(const char *partnum)
static void mityomapl138_cpufreq_init(const char *partnum) { }
#endif
static void read_factory_config(struct memory_accessor *a, void *context)
static void read_factory_config(struct nvmem_device *nvmem, void *context)
{
int ret;
const char *partnum = NULL;
struct davinci_soc_info *soc_info = &davinci_soc_info;
ret = a->read(a, (char *)&factory_config, 0, sizeof(factory_config));
ret = nvmem_device_read(nvmem, 0, sizeof(factory_config),
&factory_config);
if (ret != sizeof(struct factory_config)) {
pr_warn("Read Factory Config Failed: %d\n", ret);
goto bad_config;

4
arch/arm/mach-davinci/common.c
View file

@ -28,13 +28,13 @@ EXPORT_SYMBOL(davinci_soc_info);
void __iomem *davinci_intc_base;
int davinci_intc_type;
void davinci_get_mac_addr(struct memory_accessor *mem_acc, void *context)
void davinci_get_mac_addr(struct nvmem_device *nvmem, void *context)
{
char *mac_addr = davinci_soc_info.emac_pdata->mac_addr;
off_t offset = (off_t)context;
/* Read MAC addr from EEPROM */
if (mem_acc->read(mem_acc, mac_addr, offset, ETH_ALEN) == ETH_ALEN)
if (nvmem_device_read(nvmem, offset, ETH_ALEN, mac_addr) == ETH_ALEN)
pr_info("Read MAC addr from EEPROM: %pM\n", mac_addr);
}

31
drivers/misc/eeprom/at24.c
View file

@ -56,7 +56,6 @@
struct at24_data {
struct at24_platform_data chip;
struct memory_accessor macc;
int use_smbus;
int use_smbus_write;
@ -409,30 +408,6 @@ static ssize_t at24_write(struct at24_data *at24, const char *buf, loff_t off,
/*-------------------------------------------------------------------------*/
/*
* This lets other kernel code access the eeprom data. For example, it
* might hold a board's Ethernet address, or board-specific calibration
* data generated on the manufacturing floor.
*/
static ssize_t at24_macc_read(struct memory_accessor *macc, char *buf,
off_t offset, size_t count)
{
struct at24_data *at24 = container_of(macc, struct at24_data, macc);
return at24_read(at24, buf, offset, count);
}
static ssize_t at24_macc_write(struct memory_accessor *macc, const char *buf,
off_t offset, size_t count)
{
struct at24_data *at24 = container_of(macc, struct at24_data, macc);
return at24_write(at24, buf, offset, count);
}
/*-------------------------------------------------------------------------*/
/*
* Provide a regmap interface, which is registered with the NVMEM
* framework
@ -600,16 +575,12 @@ static int at24_probe(struct i2c_client *client, const struct i2c_device_id *id)
at24->chip = chip;
at24->num_addresses = num_addresses;
at24->macc.read = at24_macc_read;
writable = !(chip.flags & AT24_FLAG_READONLY);
if (writable) {
if (!use_smbus || use_smbus_write) {
unsigned write_max = chip.page_size;
at24->macc.write = at24_macc_write;
if (write_max > io_limit)
write_max = io_limit;
if (use_smbus && write_max > I2C_SMBUS_BLOCK_MAX)
@ -683,7 +654,7 @@ static int at24_probe(struct i2c_client *client, const struct i2c_device_id *id)
/* export data to kernel code */
if (chip.setup)
chip.setup(&at24->macc, chip.context);
chip.setup(at24->nvmem, chip.context);
return 0;

4
include/linux/davinci_emac.h
View file

@ -12,7 +12,7 @@
#define _LINUX_DAVINCI_EMAC_H
#include <linux/if_ether.h>
#include <linux/memory.h>
#include <linux/nvmem-consumer.h>
struct mdio_platform_data {
unsigned long bus_freq;
@ -46,5 +46,5 @@ enum {
EMAC_VERSION_2, /* DM646x */
};
void davinci_get_mac_addr(struct memory_accessor *mem_acc, void *context);
void davinci_get_mac_addr(struct nvmem_device *nvmem, void *context);
#endif

11
include/linux/memory.h
View file

@ -136,17 +136,6 @@ extern struct memory_block *find_memory_block(struct mem_section *);
#define unregister_hotmemory_notifier(nb) ({ (void)(nb); })
#endif
/*
* 'struct memory_accessor' is a generic interface to provide
* in-kernel access to persistent memory such as i2c or SPI EEPROMs
*/
struct memory_accessor {
ssize_t (*read)(struct memory_accessor *, char *buf, off_t offset,
size_t count);
ssize_t (*write)(struct memory_accessor *, const char *buf,
off_t offset, size_t count);
};
/*
* Kernel text modification mutex, used for code patching. Users of this lock
* can sleep.

10
include/linux/platform_data/at24.h
View file

@ -9,7 +9,7 @@
#define _LINUX_AT24_H
#include <linux/types.h>
#include <linux/memory.h>
#include <linux/nvmem-consumer.h>
/**
* struct at24_platform_data - data to set up at24 (generic eeprom) driver
@ -17,7 +17,7 @@
* @page_size: number of byte which can be written in one go
* @flags: tunable options, check AT24_FLAG_* defines
* @setup: an optional callback invoked after eeprom is probed; enables kernel
code to access eeprom via memory_accessor, see example
code to access eeprom via nvmem, see example
* @context: optional parameter passed to setup()
*
* If you set up a custom eeprom type, please double-check the parameters.
@ -26,13 +26,13 @@
*
* An example in pseudo code for a setup() callback:
*
* void get_mac_addr(struct memory_accessor *mem_acc, void *context)
* void get_mac_addr(struct mvmem_device *nvmem, void *context)
* {
* u8 *mac_addr = ethernet_pdata->mac_addr;
* off_t offset = context;
*
* // Read MAC addr from EEPROM
* if (mem_acc->read(mem_acc, mac_addr, offset, ETH_ALEN) == ETH_ALEN)
* if (nvmem_device_read(nvmem, offset, ETH_ALEN, mac_addr) == ETH_ALEN)
* pr_info("Read MAC addr from EEPROM: %pM\n", mac_addr);
* }
*
@ -48,7 +48,7 @@ struct at24_platform_data {
#define AT24_FLAG_IRUGO 0x20 /* sysfs-entry will be world-readable */
#define AT24_FLAG_TAKE8ADDR 0x10 /* take always 8 addresses (24c00) */
void (*setup)(struct memory_accessor *, void *context);
void (*setup)(struct nvmem_device *nvmem, void *context);
void *context;
};