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Diffstat (limited to 'drivers/misc/eeprom/max6875.c')
-rw-r--r--drivers/misc/eeprom/max6875.c207
1 files changed, 207 insertions, 0 deletions
diff --git a/drivers/misc/eeprom/max6875.c b/drivers/misc/eeprom/max6875.c
new file mode 100644
index 000000000..9da81f6d4
--- /dev/null
+++ b/drivers/misc/eeprom/max6875.c
@@ -0,0 +1,207 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * max6875.c - driver for MAX6874/MAX6875
+ *
+ * Copyright (C) 2005 Ben Gardner <bgardner@wabtec.com>
+ *
+ * Based on eeprom.c
+ *
+ * The MAX6875 has a bank of registers and two banks of EEPROM.
+ * Address ranges are defined as follows:
+ * * 0x0000 - 0x0046 = configuration registers
+ * * 0x8000 - 0x8046 = configuration EEPROM
+ * * 0x8100 - 0x82FF = user EEPROM
+ *
+ * This driver makes the user EEPROM available for read.
+ *
+ * The registers & config EEPROM should be accessed via i2c-dev.
+ *
+ * The MAX6875 ignores the lowest address bit, so each chip responds to
+ * two addresses - 0x50/0x51 and 0x52/0x53.
+ *
+ * Note that the MAX6875 uses i2c_smbus_write_byte_data() to set the read
+ * address, so this driver is destructive if loaded for the wrong EEPROM chip.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/mutex.h>
+
+/* The MAX6875 can only read/write 16 bytes at a time */
+#define SLICE_SIZE 16
+#define SLICE_BITS 4
+
+/* USER EEPROM is at addresses 0x8100 - 0x82FF */
+#define USER_EEPROM_BASE 0x8100
+#define USER_EEPROM_SIZE 0x0200
+#define USER_EEPROM_SLICES 32
+
+/* MAX6875 commands */
+#define MAX6875_CMD_BLK_READ 0x84
+
+/* Each client has this additional data */
+struct max6875_data {
+ struct i2c_client *fake_client;
+ struct mutex update_lock;
+
+ u32 valid;
+ u8 data[USER_EEPROM_SIZE];
+ unsigned long last_updated[USER_EEPROM_SLICES];
+};
+
+static void max6875_update_slice(struct i2c_client *client, int slice)
+{
+ struct max6875_data *data = i2c_get_clientdata(client);
+ int i, j, addr;
+ u8 *buf;
+
+ if (slice >= USER_EEPROM_SLICES)
+ return;
+
+ mutex_lock(&data->update_lock);
+
+ buf = &data->data[slice << SLICE_BITS];
+
+ if (!(data->valid & (1 << slice)) ||
+ time_after(jiffies, data->last_updated[slice])) {
+
+ dev_dbg(&client->dev, "Starting update of slice %u\n", slice);
+
+ data->valid &= ~(1 << slice);
+
+ addr = USER_EEPROM_BASE + (slice << SLICE_BITS);
+
+ /* select the eeprom address */
+ if (i2c_smbus_write_byte_data(client, addr >> 8, addr & 0xFF)) {
+ dev_err(&client->dev, "address set failed\n");
+ goto exit_up;
+ }
+
+ if (i2c_check_functionality(client->adapter,
+ I2C_FUNC_SMBUS_READ_I2C_BLOCK)) {
+ if (i2c_smbus_read_i2c_block_data(client,
+ MAX6875_CMD_BLK_READ,
+ SLICE_SIZE,
+ buf) != SLICE_SIZE) {
+ goto exit_up;
+ }
+ } else {
+ for (i = 0; i < SLICE_SIZE; i++) {
+ j = i2c_smbus_read_byte(client);
+ if (j < 0) {
+ goto exit_up;
+ }
+ buf[i] = j;
+ }
+ }
+ data->last_updated[slice] = jiffies;
+ data->valid |= (1 << slice);
+ }
+exit_up:
+ mutex_unlock(&data->update_lock);
+}
+
+static ssize_t max6875_read(struct file *filp, struct kobject *kobj,
+ struct bin_attribute *bin_attr,
+ char *buf, loff_t off, size_t count)
+{
+ struct i2c_client *client = kobj_to_i2c_client(kobj);
+ struct max6875_data *data = i2c_get_clientdata(client);
+ int slice, max_slice;
+
+ /* refresh slices which contain requested bytes */
+ max_slice = (off + count - 1) >> SLICE_BITS;
+ for (slice = (off >> SLICE_BITS); slice <= max_slice; slice++)
+ max6875_update_slice(client, slice);
+
+ memcpy(buf, &data->data[off], count);
+
+ return count;
+}
+
+static const struct bin_attribute user_eeprom_attr = {
+ .attr = {
+ .name = "eeprom",
+ .mode = S_IRUGO,
+ },
+ .size = USER_EEPROM_SIZE,
+ .read = max6875_read,
+};
+
+static int max6875_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct i2c_adapter *adapter = client->adapter;
+ struct max6875_data *data;
+ int err;
+
+ if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WRITE_BYTE_DATA
+ | I2C_FUNC_SMBUS_READ_BYTE))
+ return -ENODEV;
+
+ /* Only bind to even addresses */
+ if (client->addr & 1)
+ return -ENODEV;
+
+ data = kzalloc(sizeof(struct max6875_data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ /* A fake client is created on the odd address */
+ data->fake_client = i2c_new_dummy_device(client->adapter, client->addr + 1);
+ if (IS_ERR(data->fake_client)) {
+ err = PTR_ERR(data->fake_client);
+ goto exit_kfree;
+ }
+
+ /* Init real i2c_client */
+ i2c_set_clientdata(client, data);
+ mutex_init(&data->update_lock);
+
+ err = sysfs_create_bin_file(&client->dev.kobj, &user_eeprom_attr);
+ if (err)
+ goto exit_remove_fake;
+
+ return 0;
+
+exit_remove_fake:
+ i2c_unregister_device(data->fake_client);
+exit_kfree:
+ kfree(data);
+ return err;
+}
+
+static int max6875_remove(struct i2c_client *client)
+{
+ struct max6875_data *data = i2c_get_clientdata(client);
+
+ i2c_unregister_device(data->fake_client);
+
+ sysfs_remove_bin_file(&client->dev.kobj, &user_eeprom_attr);
+ kfree(data);
+
+ return 0;
+}
+
+static const struct i2c_device_id max6875_id[] = {
+ { "max6875", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, max6875_id);
+
+static struct i2c_driver max6875_driver = {
+ .driver = {
+ .name = "max6875",
+ },
+ .probe = max6875_probe,
+ .remove = max6875_remove,
+ .id_table = max6875_id,
+};
+
+module_i2c_driver(max6875_driver);
+
+MODULE_AUTHOR("Ben Gardner <bgardner@wabtec.com>");
+MODULE_DESCRIPTION("MAX6875 driver");
+MODULE_LICENSE("GPL");