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Date: Thu, 16 Oct 2014 10:15:08 +0200
From: Andreas Werner <andreas.werner@....de>
To: <gregkh@...uxfoundation.org>
CC: <linux-kernel@...r.kernel.org>, <wsa@...-dreams.de>,
<linux-i2c@...r.kernel.org>, <johannes.thumshirn@....de>,
<andreas.werner@....de>
Subject: [PATCH 1/2] drivers/misc/eeprom/men_eeprod: Introduce MEN Board
Information EEPROM driver
Added driver to support the MEN Board Information EEPROM.
The driver exports the production information as read only sysfs
entries, as well as a user section which is read/write accessible.
Tested on PPC QorIQ and Intel Atom E680.
Tested-by: Johannes Thumshirn <johannes.thumshirn@....de>
Signed-off-by: Andreas Werner <andreas.werner@....de>
---
MAINTAINERS | 6 +
drivers/misc/eeprom/Kconfig | 10 +
drivers/misc/eeprom/Makefile | 1 +
drivers/misc/eeprom/men_eeprod.c | 560 +++++++++++++++++++++++++++++++++++++++
4 files changed, 577 insertions(+)
create mode 100644 drivers/misc/eeprom/men_eeprod.c
diff --git a/MAINTAINERS b/MAINTAINERS
index 503da28..88ede76 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -6029,6 +6029,12 @@ F: drivers/leds/leds-menf21bmc.c
F: drivers/hwmon/menf21bmc_hwmon.c
F: Documentation/hwmon/menf21bmc
+MEN EEPROD (Board information EEPROM)
+M: Andreas Werner <andreas.werner@....de>
+S: Supported
+F: drivers/misc/eeprom/men_eeprod.c
+F: Documentation/ABI/testing/sysfs-bus-i2c-devices-men_eeprod
+
METAG ARCHITECTURE
M: James Hogan <james.hogan@...tec.com>
L: linux-metag@...r.kernel.org
diff --git a/drivers/misc/eeprom/Kconfig b/drivers/misc/eeprom/Kconfig
index 9536852f..e087d08 100644
--- a/drivers/misc/eeprom/Kconfig
+++ b/drivers/misc/eeprom/Kconfig
@@ -62,6 +62,16 @@ config EEPROM_MAX6875
This driver can also be built as a module. If so, the module
will be called max6875.
+config EEPROM_MEN_EEPROD
+ tristate "MEN Board Information EEPROM"
+ depends on I2C && SYSFS
+ help
+ If you say yes here you get support for the MEN Board Information
+ EEPROM. This driver supports read-only access to the production
+ data section, and read-write access to the user section.
+
+ This driver can also be built as a module. If so, the module
+ will be called men_eeprod.
config EEPROM_93CX6
tristate "EEPROM 93CX6 support"
diff --git a/drivers/misc/eeprom/Makefile b/drivers/misc/eeprom/Makefile
index 9507aec..8c70a81 100644
--- a/drivers/misc/eeprom/Makefile
+++ b/drivers/misc/eeprom/Makefile
@@ -2,6 +2,7 @@ obj-$(CONFIG_EEPROM_AT24) += at24.o
obj-$(CONFIG_EEPROM_AT25) += at25.o
obj-$(CONFIG_EEPROM_LEGACY) += eeprom.o
obj-$(CONFIG_EEPROM_MAX6875) += max6875.o
+obj-$(CONFIG_EEPROM_MEN_EEPROD) += men_eeprod.o
obj-$(CONFIG_EEPROM_93CX6) += eeprom_93cx6.o
obj-$(CONFIG_EEPROM_93XX46) += eeprom_93xx46.o
obj-$(CONFIG_EEPROM_SUNXI_SID) += sunxi_sid.o
diff --git a/drivers/misc/eeprom/men_eeprod.c b/drivers/misc/eeprom/men_eeprod.c
new file mode 100644
index 0000000..28264df
--- /dev/null
+++ b/drivers/misc/eeprom/men_eeprod.c
@@ -0,0 +1,560 @@
+/*
+ * men_eeprod - MEN board information EEPROM driver.
+ *
+ * This is the driver for the Board Information EEPROM on almost
+ * all of the MEN boards.
+ * The driver exports each of the predefined eeprom sections as sysfs entries
+ * including an entry for user data.
+ *
+ * The EEPROM can be normally found at I2C address 0x57.
+ *
+ * Copyright (C) 2014 MEN Mikro Elektronik Nuernberg GmbH
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ */
+
+/*
+ * Supports the following EEPROM layouts:
+ *
+ * Name eeprod_id user_section size
+ * ----------------------------------------------
+ * EEPROD2 0x0E 232 byte
+ *
+ * See Documentation/ABI/testing/sysfs-bus-i2c-devices-men_eeprod
+ * for more details.
+ */
+
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/jiffies.h>
+#include <linux/delay.h>
+#include <linux/sysfs.h>
+
+#define EEPROM_ID_ADDR 0x00
+#define EEPROM_SIZE 256
+#define EEPROD2_ID 0x0E
+
+#define DATE_YEAR_BIAS 1990
+
+/*
+ * Internal structure of the Board Information EEPROM
+ * production data section
+ */
+struct eeprom_data {
+ uint8_t eeprod_id;
+
+ uint8_t revision[3];
+ uint32_t serialnr;
+ uint8_t board_model;
+ char hw_name[6];
+
+ uint8_t reserved;
+
+ __be16 prod_date;
+ __be16 rep_date;
+
+ uint8_t reserved2[4];
+};
+
+struct men_eeprod_data {
+ struct bin_attribute user_section;
+ struct i2c_client *client;
+ struct eeprom_data eeprom;
+ struct mutex lock;
+ int smb_access;
+};
+
+static unsigned int i2c_timeout = 25;
+module_param(i2c_timeout, uint, 0);
+MODULE_PARM_DESC(i2c_timeout, "Time (in ms) to try reads and writes (default 25)");
+
+#define OFFSET_TO_USR_SECTION(off) (off + sizeof(struct eeprom_data))
+
+static inline int eeprod_get_day(__be16 eeprod_date)
+{
+ return be16_to_cpu(eeprod_date) & 0x001f;
+}
+
+static inline int eeprod_get_month(__be16 eeprod_date)
+{
+ return (be16_to_cpu(eeprod_date) >> 5) & 0x000f;
+}
+
+static inline int eeprod_get_year(__be16 eeprod_date)
+{
+ return ((be16_to_cpu(eeprod_date) >> 9) & 0x007f) + DATE_YEAR_BIAS;
+}
+
+static ssize_t men_eeprom_read(struct men_eeprod_data *drv_data,
+ char *buf, loff_t offset, size_t count)
+{
+ struct i2c_client *i2c_client = drv_data->client;
+ unsigned long timeout, read_time;
+ int ret_val;
+
+ /*
+ * Read fail if the previous write did not copmlete yet.
+ * Therefore we try to read a few times until this succeed.
+ */
+ timeout = jiffies + msecs_to_jiffies(i2c_timeout);
+ do {
+ read_time = jiffies;
+
+ /*
+ * if there is just one byte requested, we use read byte data.
+ * This will also protect us against a rollover if there is
+ * just one byte left to read.
+ */
+ if (count == 1) {
+ ret_val = i2c_smbus_read_byte_data(i2c_client, offset);
+ if (ret_val >= 0) {
+ buf[0] = ret_val;
+ ret_val = 1;
+ }
+ goto err_byte;
+ }
+
+ switch (drv_data->smb_access) {
+ case I2C_SMBUS_I2C_BLOCK_DATA:
+ if (count > I2C_SMBUS_BLOCK_MAX)
+ count = I2C_SMBUS_BLOCK_MAX;
+
+ ret_val = i2c_smbus_read_i2c_block_data(i2c_client,
+ offset, count,
+ buf);
+ if (ret_val >= 0)
+ return count;
+ break;
+ case I2C_SMBUS_WORD_DATA:
+ ret_val = i2c_smbus_read_word_data(i2c_client, offset);
+ if (ret_val >= 0) {
+ buf[0] = ret_val & 0xff;
+ buf[1] = ret_val >> 8;
+ return 2;
+ }
+ break;
+ default:
+ ret_val = i2c_smbus_read_byte_data(i2c_client, offset);
+ if (ret_val >= 0) {
+ buf[0] = ret_val;
+ return 1;
+ }
+ break;
+ }
+
+err_byte:
+ usleep_range(600, 1000);
+ } while (time_before(read_time, timeout));
+
+ return -ETIMEDOUT;
+
+}
+
+static ssize_t men_user_section_read(struct file *filp, struct kobject *kobj,
+ struct bin_attribute *attr,
+ char *buf, loff_t off, size_t count)
+{
+ struct device *dev = container_of(kobj, struct device, kobj);
+ struct men_eeprod_data *drv_data = dev_get_drvdata(dev);
+ int user_section_size = attr->size;
+ ssize_t retval = 0;
+ int bytes_read;
+
+ if (off > user_section_size)
+ return 0;
+
+ if (off + count > user_section_size)
+ count = user_section_size - off;
+
+ off = OFFSET_TO_USR_SECTION(off);
+
+ mutex_lock(&drv_data->lock);
+ while (count) {
+ bytes_read = men_eeprom_read(drv_data, buf, off, count);
+
+ if (bytes_read <= 0) {
+ if (retval == 0)
+ retval = bytes_read;
+ break;
+ }
+
+ buf += bytes_read;
+ off += bytes_read;
+ count -= bytes_read;
+ retval += bytes_read;
+ }
+ mutex_unlock(&drv_data->lock);
+
+ return retval;
+}
+
+static ssize_t men_eeprom_write(struct men_eeprod_data *drv_data,
+ char *buf, loff_t offset, size_t count)
+{
+ struct i2c_client *i2c_client = drv_data->client;
+ unsigned long timeout, write_time;
+ uint16_t word_data;
+ int ret_val;
+
+ /*
+ * Write fail if the previous write did not copmlete yet.
+ * Therefore we try to write a few times until this succeed.
+ */
+ timeout = jiffies + msecs_to_jiffies(i2c_timeout);
+ do {
+ write_time = jiffies;
+
+ /*
+ * if there is just one byte to write, we use write byte data.
+ * This will also protect us against a rollover if there is
+ * just one byte left to write.
+ */
+ if (count == 1) {
+ ret_val = i2c_smbus_write_byte_data(i2c_client, offset,
+ buf[0]);
+ if (!ret_val)
+ return 1;
+ goto err_byte;
+ }
+
+ switch (drv_data->smb_access) {
+ case I2C_SMBUS_I2C_BLOCK_DATA:
+ if (count > I2C_SMBUS_BLOCK_MAX)
+ count = I2C_SMBUS_BLOCK_MAX;
+
+ ret_val = i2c_smbus_write_i2c_block_data(i2c_client,
+ offset, count,
+ buf);
+ if (!ret_val)
+ return count;
+ break;
+ case I2C_SMBUS_WORD_DATA:
+ word_data = buf[0] | (buf[1] << 8);
+
+ ret_val = i2c_smbus_write_word_data(i2c_client, offset,
+ word_data);
+ if (!ret_val)
+ return 2;
+ break;
+ default:
+ ret_val = i2c_smbus_write_byte_data(i2c_client, offset,
+ buf[0]);
+ if (!ret_val)
+ return 1;
+ break;
+ }
+err_byte:
+ usleep_range(600, 1000);
+ } while (time_before(write_time, timeout));
+
+ return -ETIMEDOUT;
+}
+
+static ssize_t men_user_section_write(struct file *filp, struct kobject *kobj,
+ struct bin_attribute *attr, char *buf,
+ loff_t off, size_t count)
+{
+ struct device *dev = container_of(kobj, struct device, kobj);
+ struct men_eeprod_data *drv_data = dev_get_drvdata(dev);
+ int user_section_size = attr->size;
+ int bytes_written;
+ ssize_t retval = 0;
+
+ if (off > user_section_size)
+ return 0;
+
+ if (off + count > user_section_size)
+ count = user_section_size - off;
+
+ off = OFFSET_TO_USR_SECTION(off);
+
+ mutex_lock(&drv_data->lock);
+ while (count) {
+ bytes_written = men_eeprom_write(drv_data, buf, off, count);
+
+ if (bytes_written <= 0) {
+ if (retval == 0)
+ retval = bytes_written;
+ break;
+ }
+
+ buf += bytes_written;
+ off += bytes_written;
+ count -= bytes_written;
+ retval += bytes_written;
+ }
+ mutex_unlock(&drv_data->lock);
+
+ return retval;
+}
+
+static ssize_t
+show_eeprod_id(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ struct men_eeprod_data *drv_data = dev_get_drvdata(dev);
+ struct eeprom_data *eeprom = &drv_data->eeprom;
+
+ return sprintf(buf, "0x%02x\n", eeprom->eeprod_id);
+}
+
+static ssize_t
+show_revision(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ struct men_eeprod_data *drv_data = dev_get_drvdata(dev);
+ struct eeprom_data *eeprom = &drv_data->eeprom;
+
+ return sprintf(buf, "%02d.%02d.%02d\n", eeprom->revision[0],
+ eeprom->revision[1], eeprom->revision[2]);
+}
+
+static ssize_t
+show_serialnr(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ struct men_eeprod_data *drv_data = dev_get_drvdata(dev);
+ struct eeprom_data *eeprom = &drv_data->eeprom;
+
+ return sprintf(buf, "%d\n", cpu_to_be32(eeprom->serialnr));
+}
+
+static ssize_t
+show_hw_name(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ struct men_eeprod_data *drv_data = dev_get_drvdata(dev);
+ struct eeprom_data *eeprom = &drv_data->eeprom;
+
+ return sprintf(buf, "%s%02d\n", eeprom->hw_name, eeprom->board_model);
+}
+
+static ssize_t
+show_prod_date(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ struct men_eeprod_data *drv_data = dev_get_drvdata(dev);
+ __be16 eeprod_date = drv_data->eeprom.prod_date;
+
+ return sprintf(buf, "%04d-%02d-%02d\n",
+ eeprod_get_year(eeprod_date),
+ eeprod_get_month(eeprod_date),
+ eeprod_get_day(eeprod_date));
+}
+
+static ssize_t
+show_rep_date(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ struct men_eeprod_data *drv_data = dev_get_drvdata(dev);
+ __be16 eeprod_date = drv_data->eeprom.rep_date;
+
+ /*
+ * could be empty if the board was never send back
+ * to the repair department.
+ */
+ if (eeprod_date == cpu_to_be16(0xffff))
+ return -EINVAL;
+
+ return sprintf(buf, "%04d-%02d-%02d\n",
+ eeprod_get_year(eeprod_date),
+ eeprod_get_month(eeprod_date),
+ eeprod_get_day(eeprod_date));
+}
+
+static DEVICE_ATTR(eeprod_id, S_IRUGO, show_eeprod_id, NULL);
+static DEVICE_ATTR(revision, S_IRUGO, show_revision, NULL);
+static DEVICE_ATTR(serial, S_IRUGO, show_serialnr, NULL);
+static DEVICE_ATTR(hw_name, S_IRUGO, show_hw_name, NULL);
+static DEVICE_ATTR(prod_date, S_IRUGO, show_prod_date, NULL);
+static DEVICE_ATTR(rep_date, S_IRUGO, show_rep_date, NULL);
+
+static struct attribute *eeprod_attrs[] = {
+ &dev_attr_eeprod_id.attr,
+ &dev_attr_revision.attr,
+ &dev_attr_serial.attr,
+ &dev_attr_hw_name.attr,
+ &dev_attr_prod_date.attr,
+ &dev_attr_rep_date.attr,
+ NULL,
+};
+
+static struct attribute_group eeprod_attr_group = {
+ .attrs = eeprod_attrs,
+};
+
+static struct bin_attribute eeprom_user_attr = {
+ .attr = {
+ .name = "user_section",
+ .mode = S_IRUGO | S_IWUSR,
+ },
+ .size = EEPROM_SIZE - sizeof(struct eeprom_data),
+ .read = men_user_section_read,
+ .write = men_user_section_write,
+};
+
+static int men_eeprod_read_prod_data(struct men_eeprod_data *drv_data)
+{
+ struct eeprom_data *eeprom = &drv_data->eeprom;
+ uint8_t *eeprom_byte;
+ int i, ret;
+
+ eeprom_byte = (uint8_t *)eeprom + 1;
+
+ for (i = 1; i < sizeof(*eeprom); i++) {
+ ret = i2c_smbus_read_byte_data(drv_data->client, i);
+ if (ret < 0)
+ return ret;
+
+ *(eeprom_byte++) = ret;
+ }
+ return 0;
+}
+
+static int men_eeprod_calc_parity(struct eeprom_data *eeprom)
+{
+ uint8_t *eeprom_byte;
+ int parity, len;
+
+ eeprom_byte = (uint8_t *)eeprom + 1;
+ len = sizeof(*eeprom) - 1;
+ parity = 0x0f;
+
+ while (len--) {
+ parity ^= (*eeprom_byte >> 4);
+ parity ^= (*eeprom_byte) & 0x0f;
+ eeprom_byte++;
+ }
+
+ return parity;
+}
+
+static int men_eeprod_i2c_functionality(struct men_eeprod_data *drv_data)
+{
+ struct i2c_adapter *i2c_adapter = drv_data->client->adapter;
+ int ret;
+
+ /*
+ * As the minimum we need read/write byte data
+ * which every adapter should support
+ */
+ ret = i2c_check_functionality(i2c_adapter,
+ I2C_FUNC_SMBUS_BYTE_DATA);
+ if (!ret)
+ return -ENODEV;
+
+ if (i2c_check_functionality(i2c_adapter,
+ I2C_FUNC_SMBUS_I2C_BLOCK)) {
+ drv_data->smb_access = I2C_SMBUS_I2C_BLOCK_DATA;
+ } else if (i2c_check_functionality(i2c_adapter,
+ I2C_FUNC_SMBUS_WORD_DATA)) {
+ drv_data->smb_access = I2C_SMBUS_WORD_DATA;
+ } else {
+ drv_data->smb_access = I2C_SMBUS_BYTE_DATA;
+ }
+
+ return 0;
+}
+
+static int
+men_eeprod_probe(struct i2c_client *client, const struct i2c_device_id *id)
+{
+ struct men_eeprod_data *drv_data;
+ int eeprod_id, eeprod_chksum;
+ int parity, ret;
+
+ drv_data = devm_kzalloc(&client->dev, sizeof(*drv_data), GFP_KERNEL);
+ if (!drv_data)
+ return -ENOMEM;
+
+ drv_data->client = client;
+ mutex_init(&drv_data->lock);
+
+ i2c_set_clientdata(client, drv_data);
+
+ ret = men_eeprod_i2c_functionality(drv_data);
+ if (ret)
+ return ret;
+
+ eeprod_id = i2c_smbus_read_byte_data(client, EEPROM_ID_ADDR);
+ if (eeprod_id < 0)
+ return eeprod_id;
+
+ eeprod_chksum = eeprod_id & 0x0f;
+ eeprod_id >>= 4;
+ drv_data->eeprom.eeprod_id = eeprod_id;
+
+ if (eeprod_id == EEPROD2_ID) {
+ dev_info(&client->dev,
+ "found MEN Board EEPROM. ID: 0x%02x\n", eeprod_id);
+ } else {
+ dev_err(&client->dev,
+ "board eeprom not supported. ID: 0x%02x\n", eeprod_id);
+ return -ENXIO;
+ }
+
+ ret = men_eeprod_read_prod_data(drv_data);
+ if (ret < 0) {
+ dev_err(&client->dev, "failed to read EEPROM board data\n");
+ return ret;
+ }
+
+ parity = men_eeprod_calc_parity(&drv_data->eeprom);
+ if (parity != eeprod_chksum) {
+ dev_err(&client->dev, "checksum error. eeprom in invalid state\n");
+ return -EINVAL;
+ }
+
+ drv_data->user_section = eeprom_user_attr;
+ ret = sysfs_create_bin_file(&client->dev.kobj,
+ &drv_data->user_section);
+ if (ret) {
+ dev_err(&client->dev,
+ "failed to create user_section sysfs entry\n");
+ return ret;
+ }
+
+ ret = sysfs_create_group(&client->dev.kobj, &eeprod_attr_group);
+ if (ret < 0) {
+ dev_err(&client->dev, "failed to create sysfs entries\n");
+ goto err_sysfs;
+ }
+
+ dev_info(&client->dev, "MEN Board Information EEPROM registered\n");
+
+ return 0;
+
+err_sysfs:
+ sysfs_remove_bin_file(&client->dev.kobj, &drv_data->user_section);
+ return ret;
+}
+
+static int men_eeprod_remove(struct i2c_client *client)
+{
+ struct men_eeprod_data *drv_data = i2c_get_clientdata(client);
+
+ sysfs_remove_group(&client->dev.kobj, &eeprod_attr_group);
+ sysfs_remove_bin_file(&client->dev.kobj, &drv_data->user_section);
+ return 0;
+}
+
+static const struct i2c_device_id men_eeprod_ids[] = {
+ { "men_eeprod" },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, men_eeprod_ids);
+
+static struct i2c_driver men_eeprod_driver = {
+ .driver = {
+ .name = "men_eeprod",
+ .owner = THIS_MODULE,
+ },
+ .probe = men_eeprod_probe,
+ .remove = men_eeprod_remove,
+ .id_table = men_eeprod_ids,
+};
+
+module_i2c_driver(men_eeprod_driver);
+
+MODULE_DESCRIPTION("MEN Board Information EEPROM driver");
+MODULE_AUTHOR("Andreas Werner <andreas.werner@....de>");
+MODULE_LICENSE("GPL v2");
--
2.1.0
--
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