@@ -63,9 +63,6 @@ struct at24_client {
struct at24_data {
struct at24_platform_data chip;
- int use_smbus;
-
- ssize_t (*read_func)(struct at24_data *, char *, unsigned int, size_t);
/*
* Lock protects against activities from other Linux tasks,
@@ -279,39 +276,6 @@ static struct at24_client *at24_translate_offset(struct at24_data *at24,
return &at24->client[i];
}
-static ssize_t at24_eeprom_read_smbus(struct at24_data *at24, char *buf,
- unsigned int offset, size_t count)
-{
- unsigned long timeout, read_time;
- struct at24_client *at24_client;
- struct i2c_client *client;
- int status;
-
- at24_client = at24_translate_offset(at24, &offset);
- client = at24_client->client;
-
- if (count > io_limit)
- count = io_limit;
-
- /* Smaller eeproms can work given some SMBus extension calls */
- if (count > I2C_SMBUS_BLOCK_MAX)
- count = I2C_SMBUS_BLOCK_MAX;
-
- loop_until_timeout(timeout, read_time) {
- status = i2c_smbus_read_i2c_block_data_or_emulated(client,
- offset,
- count, buf);
-
- dev_dbg(&client->dev, "read %zu@%d --> %d (%ld)\n",
- count, offset, status, jiffies);
-
- if (status == count)
- return count;
- }
-
- return -ETIMEDOUT;
-}
-
static void at24_adjust_read_offset(struct at24_data *at24,
unsigned int *offset)
{
@@ -363,145 +327,6 @@ static ssize_t at24_regmap_read(struct at24_data *at24, char *buf,
return -ETIMEDOUT;
}
-static ssize_t at24_eeprom_read_i2c(struct at24_data *at24, char *buf,
- unsigned int offset, size_t count)
-{
- unsigned long timeout, read_time;
- struct at24_client *at24_client;
- struct i2c_client *client;
- struct i2c_msg msg[2];
- int status, i;
- u8 msgbuf[2];
-
- memset(msg, 0, sizeof(msg));
- at24_client = at24_translate_offset(at24, &offset);
- client = at24_client->client;
-
- if (count > io_limit)
- count = io_limit;
-
- /*
- * When we have a better choice than SMBus calls, use a combined I2C
- * message. Write address; then read up to io_limit data bytes. Note
- * that read page rollover helps us here (unlike writes). msgbuf is
- * u8 and will cast to our needs.
- */
- i = 0;
- if (at24->chip.flags & AT24_FLAG_ADDR16)
- msgbuf[i++] = offset >> 8;
- msgbuf[i++] = offset;
-
- msg[0].addr = client->addr;
- msg[0].buf = msgbuf;
- msg[0].len = i;
-
- msg[1].addr = client->addr;
- msg[1].flags = I2C_M_RD;
- msg[1].buf = buf;
- msg[1].len = count;
-
- loop_until_timeout(timeout, read_time) {
- status = i2c_transfer(client->adapter, msg, 2);
- if (status == 2)
- status = count;
-
- dev_dbg(&client->dev, "read %zu@%d --> %d (%ld)\n",
- count, offset, status, jiffies);
-
- if (status == count)
- return count;
- }
-
- return -ETIMEDOUT;
-}
-
-static ssize_t at24_eeprom_read_serial(struct at24_data *at24, char *buf,
- unsigned int offset, size_t count)
-{
- unsigned long timeout, read_time;
- struct at24_client *at24_client;
- struct i2c_client *client;
- struct i2c_msg msg[2];
- u8 addrbuf[2];
- int status;
-
- at24_client = at24_translate_offset(at24, &offset);
- client = at24_client->client;
-
- memset(msg, 0, sizeof(msg));
- msg[0].addr = client->addr;
- msg[0].buf = addrbuf;
-
- /*
- * The address pointer of the device is shared between the regular
- * EEPROM array and the serial number block. The dummy write (part of
- * the sequential read protocol) ensures the address pointer is reset
- * to the desired position.
- */
- if (at24->chip.flags & AT24_FLAG_ADDR16) {
- /*
- * For 16 bit address pointers, the word address must contain
- * a '10' sequence in bits 11 and 10 regardless of the
- * intended position of the address pointer.
- */
- addrbuf[0] = 0x08;
- addrbuf[1] = offset;
- msg[0].len = 2;
- } else {
- /*
- * Otherwise the word address must begin with a '10' sequence,
- * regardless of the intended address.
- */
- addrbuf[0] = 0x80 + offset;
- msg[0].len = 1;
- }
-
- msg[1].addr = client->addr;
- msg[1].flags = I2C_M_RD;
- msg[1].buf = buf;
- msg[1].len = count;
-
- loop_until_timeout(timeout, read_time) {
- status = i2c_transfer(client->adapter, msg, 2);
- if (status == 2)
- return count;
- }
-
- return -ETIMEDOUT;
-}
-
-static ssize_t at24_eeprom_read_mac(struct at24_data *at24, char *buf,
- unsigned int offset, size_t count)
-{
- unsigned long timeout, read_time;
- struct at24_client *at24_client;
- struct i2c_client *client;
- struct i2c_msg msg[2];
- u8 addrbuf[2];
- int status;
-
- at24_client = at24_translate_offset(at24, &offset);
- client = at24_client->client;
-
- memset(msg, 0, sizeof(msg));
- msg[0].addr = client->addr;
- msg[0].buf = addrbuf;
- addrbuf[0] = 0x90 + offset;
- msg[0].len = 1;
- msg[1].addr = client->addr;
- msg[1].flags = I2C_M_RD;
- msg[1].buf = buf;
- msg[1].len = count;
-
- loop_until_timeout(timeout, read_time) {
- status = i2c_transfer(client->adapter, msg, 2);
- if (status == 2)
- return count;
- }
-
- return -ETIMEDOUT;
-}
-
/*
* Note that if the hardware write-protect pin is pulled high, the whole
* chip is normally write protected. But there are plenty of product
@@ -785,7 +610,6 @@ static int at24_probe(struct i2c_client *client, const struct i2c_device_id *id)
return -ENOMEM;
mutex_init(&at24->lock);
- at24->use_smbus = use_smbus;
at24->chip = chip;
at24->num_addresses = num_addresses;
@@ -800,15 +624,6 @@ static int at24_probe(struct i2c_client *client, const struct i2c_device_id *id)
return -EINVAL;
}
- if (chip.flags & AT24_FLAG_SERIAL) {
- at24->read_func = at24_eeprom_read_serial;
- } else if (chip.flags & AT24_FLAG_MAC) {
- at24->read_func = at24_eeprom_read_mac;
- } else {
- at24->read_func = at24->use_smbus ? at24_eeprom_read_smbus
- : at24_eeprom_read_i2c;
- }
-
writable = !(chip.flags & AT24_FLAG_READONLY);
if (writable) {
if (!use_smbus || use_smbus_write) {
Remove the old and now unused read functions. Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> --- v2: - rebased v3: - rebased --- drivers/misc/eeprom/at24.c | 185 --------------------------------------------- 1 file changed, 185 deletions(-)