#include <linux/bitops.h>
#include <linux/jiffies.h>
#include <linux/of.h>
+#include <linux/acpi.h>
#include <linux/i2c.h>
#include <linux/platform_data/at24.h>
};
MODULE_DEVICE_TABLE(i2c, at24_ids);
+static const struct acpi_device_id at24_acpi_ids[] = {
+ { "INT3499", AT24_DEVICE_MAGIC(8192 / 8, 0) },
+ { }
+};
+MODULE_DEVICE_TABLE(acpi, at24_acpi_ids);
+
/*-------------------------------------------------------------------------*/
/*
if (count > io_limit)
count = io_limit;
- switch (at24->use_smbus) {
- case I2C_SMBUS_I2C_BLOCK_DATA:
+ if (at24->use_smbus) {
/* Smaller eeproms can work given some SMBus extension calls */
if (count > I2C_SMBUS_BLOCK_MAX)
count = I2C_SMBUS_BLOCK_MAX;
- break;
- case I2C_SMBUS_WORD_DATA:
- count = 2;
- break;
- case I2C_SMBUS_BYTE_DATA:
- count = 1;
- break;
- default:
+ } else {
/*
* When we have a better choice than SMBus calls, use a
* combined I2C message. Write address; then read up to
timeout = jiffies + msecs_to_jiffies(write_timeout);
do {
read_time = jiffies;
- switch (at24->use_smbus) {
- case I2C_SMBUS_I2C_BLOCK_DATA:
- status = i2c_smbus_read_i2c_block_data(client, offset,
- count, buf);
- break;
- case I2C_SMBUS_WORD_DATA:
- status = i2c_smbus_read_word_data(client, offset);
- if (status >= 0) {
- buf[0] = status & 0xff;
- buf[1] = status >> 8;
- status = count;
- }
- break;
- case I2C_SMBUS_BYTE_DATA:
- status = i2c_smbus_read_byte_data(client, offset);
- if (status >= 0) {
- buf[0] = status;
- status = count;
- }
- break;
- default:
+ if (at24->use_smbus) {
+ status = i2c_smbus_read_i2c_block_data_or_emulated(client, offset,
+ count, buf);
+ } else {
status = i2c_transfer(client->adapter, msg, 2);
if (status == 2)
status = count;
{
struct at24_data *at24;
- if (unlikely(off >= attr->size))
- return -EFBIG;
-
at24 = dev_get_drvdata(container_of(kobj, struct device, kobj));
return at24_write(at24, buf, off, count);
}
static int at24_probe(struct i2c_client *client, const struct i2c_device_id *id)
{
struct at24_platform_data chip;
+ kernel_ulong_t magic = 0;
bool writable;
int use_smbus = 0;
int use_smbus_write = 0;
struct at24_data *at24;
int err;
unsigned i, num_addresses;
- kernel_ulong_t magic;
if (client->dev.platform_data) {
chip = *(struct at24_platform_data *)client->dev.platform_data;
} else {
- if (!id->driver_data)
+ if (id) {
+ magic = id->driver_data;
+ } else {
+ const struct acpi_device_id *aid;
+
+ aid = acpi_match_device(at24_acpi_ids, &client->dev);
+ if (aid)
+ magic = aid->driver_data;
+ }
+ if (!magic)
return -ENODEV;
- magic = id->driver_data;
chip.byte_len = BIT(magic & AT24_BITMASK(AT24_SIZE_BYTELEN));
magic >>= AT24_SIZE_BYTELEN;
chip.flags = magic & AT24_BITMASK(AT24_SIZE_FLAGS);
static struct i2c_driver at24_driver = {
.driver = {
.name = "at24",
- .owner = THIS_MODULE,
+ .acpi_match_table = ACPI_PTR(at24_acpi_ids),
},
.probe = at24_probe,
.remove = at24_remove,