@@ -4,6 +4,7 @@ config EEPROM_AT24
tristate "I2C EEPROMs / RAMs / ROMs from most vendors"
depends on I2C && SYSFS
select NVMEM
+ select REGMAP_I2C
help
Enable this driver to get read/write support to most I2C EEPROMs
and compatible devices like FRAMs, SRAMs, ROMs etc. After you
@@ -24,6 +24,7 @@
#include <linux/acpi.h>
#include <linux/i2c.h>
#include <linux/nvmem-provider.h>
+#include <linux/regmap.h>
#include <linux/platform_data/at24.h>
#include <linux/pm_runtime.h>
@@ -55,6 +56,11 @@
* which won't work on pure SMBus systems.
*/
+struct at24_client {
+ struct i2c_client *client;
+ struct regmap *regmap;
+};
+
struct at24_data {
struct at24_platform_data chip;
int use_smbus;
@@ -81,7 +87,7 @@ struct at24_data {
* Some chips tie up multiple I2C addresses; dummy devices reserve
* them for us, and we'll use them with SMBus calls.
*/
- struct i2c_client *client[];
+ struct at24_client client[];
};
/*
@@ -274,7 +280,7 @@ static struct i2c_client *at24_translate_offset(struct at24_data *at24,
*offset &= 0xff;
}
- return at24->client[i];
+ return at24->client[i].client;
}
static ssize_t at24_eeprom_read_smbus(struct at24_data *at24, char *buf,
@@ -673,6 +679,16 @@ static void at24_get_pdata(struct device *dev, struct at24_platform_data *chip)
}
}
+static const struct regmap_config regmap_config_8 = {
+ .reg_bits = 8,
+ .val_bits = 8,
+};
+
+static const struct regmap_config regmap_config_16 = {
+ .reg_bits = 16,
+ .val_bits = 8,
+};
+
static int at24_probe(struct i2c_client *client, const struct i2c_device_id *id)
{
struct at24_platform_data chip;
@@ -683,6 +699,7 @@ static int at24_probe(struct i2c_client *client, const struct i2c_device_id *id)
struct at24_data *at24;
int err;
unsigned i, num_addresses;
+ const struct regmap_config *config;
u8 test_byte;
if (client->dev.platform_data) {
@@ -764,8 +781,13 @@ static int at24_probe(struct i2c_client *client, const struct i2c_device_id *id)
num_addresses = DIV_ROUND_UP(chip.byte_len,
(chip.flags & AT24_FLAG_ADDR16) ? 65536 : 256);
+ if (chip.flags & AT24_FLAG_ADDR16)
+ config = ®map_config_16;
+ else
+ config = ®map_config_8;
+
at24 = devm_kzalloc(&client->dev, sizeof(struct at24_data) +
- num_addresses * sizeof(struct i2c_client *), GFP_KERNEL);
+ num_addresses * sizeof(struct at24_client), GFP_KERNEL);
if (!at24)
return -ENOMEM;
@@ -775,6 +797,11 @@ static int at24_probe(struct i2c_client *client, const struct i2c_device_id *id)
at24->chip = chip;
at24->num_addresses = num_addresses;
+ at24->client[0].client = client;
+ at24->client[0].regmap = devm_regmap_init_i2c(client, config);
+ if (IS_ERR(at24->client[0].regmap))
+ return PTR_ERR(at24->client[0].regmap);
+
if ((chip.flags & AT24_FLAG_SERIAL) && (chip.flags & AT24_FLAG_MAC)) {
dev_err(&client->dev,
"invalid device data - cannot have both AT24_FLAG_SERIAL & AT24_FLAG_MAC.");
@@ -822,18 +849,22 @@ static int at24_probe(struct i2c_client *client, const struct i2c_device_id *id)
}
}
- at24->client[0] = client;
-
/* use dummy devices for multiple-address chips */
for (i = 1; i < num_addresses; i++) {
- at24->client[i] = i2c_new_dummy(client->adapter,
- client->addr + i);
- if (!at24->client[i]) {
+ at24->client[i].client = i2c_new_dummy(client->adapter,
+ client->addr + i);
+ if (!at24->client[i].client) {
dev_err(&client->dev, "address 0x%02x unavailable\n",
client->addr + i);
err = -EADDRINUSE;
goto err_clients;
}
+ at24->client[i].regmap = devm_regmap_init_i2c(
+ at24->client[i].client, config);
+ if (IS_ERR(at24->client[i].regmap)) {
+ err = PTR_ERR(at24->client[i].regmap);
+ goto err_clients;
+ }
}
i2c_set_clientdata(client, at24);
@@ -892,8 +923,8 @@ static int at24_probe(struct i2c_client *client, const struct i2c_device_id *id)
err_clients:
for (i = 1; i < num_addresses; i++)
- if (at24->client[i])
- i2c_unregister_device(at24->client[i]);
+ if (at24->client[i].client)
+ i2c_unregister_device(at24->client[i].client);
pm_runtime_disable(&client->dev);
@@ -910,7 +941,7 @@ static int at24_remove(struct i2c_client *client)
nvmem_unregister(at24->nvmem);
for (i = 1; i < at24->num_addresses; i++)
- i2c_unregister_device(at24->client[i]);
+ i2c_unregister_device(at24->client[i].client);
pm_runtime_disable(&client->dev);
pm_runtime_set_suspended(&client->dev);
This patch adds basic regmap support to be used by subsequent patches of this series. Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> --- v2: - rebased --- drivers/misc/eeprom/Kconfig | 1 + drivers/misc/eeprom/at24.c | 53 +++++++++++++++++++++++++++++++++++---------- 2 files changed, 43 insertions(+), 11 deletions(-)