// SPDX-License-Identifier: GPL-2.0 /* * IPMB driver to receive a request and send a response * * Copyright (C) 2019 Mellanox Techologies, Ltd. * * This was inspired by Brendan Higgins' ipmi-bmc-bt-i2c driver. */ #include <linux/acpi.h> #include <linux/errno.h> #include <linux/i2c.h> #include <linux/miscdevice.h> #include <linux/module.h> #include <linux/mutex.h> #include <linux/poll.h> #include <linux/slab.h> #include <linux/spinlock.h> #include <linux/wait.h> #define MAX_MSG_LEN … #define IPMB_REQUEST_LEN_MIN … #define NETFN_RSP_BIT_MASK … #define REQUEST_QUEUE_MAX_LEN … #define IPMB_MSG_LEN_IDX … #define RQ_SA_8BIT_IDX … #define NETFN_LUN_IDX … #define GET_7BIT_ADDR(addr_8bit) … #define GET_8BIT_ADDR(addr_7bit) … #define IPMB_MSG_PAYLOAD_LEN_MAX … #define SMBUS_MSG_HEADER_LENGTH … #define SMBUS_MSG_IDX_OFFSET … struct ipmb_msg { … } __packed; struct ipmb_request_elem { … }; struct ipmb_dev { … }; static inline struct ipmb_dev *to_ipmb_dev(struct file *file) { … } static ssize_t ipmb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) { … } static int ipmb_i2c_write(struct i2c_client *client, u8 *msg, u8 addr) { … } static ssize_t ipmb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { … } static __poll_t ipmb_poll(struct file *file, poll_table *wait) { … } static const struct file_operations ipmb_fops = …; /* Called with ipmb_dev->lock held. */ static void ipmb_handle_request(struct ipmb_dev *ipmb_dev) { … } static u8 ipmb_verify_checksum1(struct ipmb_dev *ipmb_dev, u8 rs_sa) { … } /* * Verify if message has proper ipmb header with minimum length * and correct checksum byte. */ static bool is_ipmb_msg(struct ipmb_dev *ipmb_dev, u8 rs_sa) { … } /* * The IPMB protocol only supports I2C Writes so there is no need * to support I2C_SLAVE_READ* events. * This i2c callback function only monitors IPMB request messages * and adds them in a queue, so that they can be handled by * receive_ipmb_request. */ static int ipmb_slave_cb(struct i2c_client *client, enum i2c_slave_event event, u8 *val) { … } static int ipmb_probe(struct i2c_client *client) { … } static void ipmb_remove(struct i2c_client *client) { … } static const struct i2c_device_id ipmb_id[] = …; MODULE_DEVICE_TABLE(i2c, ipmb_id); static const struct acpi_device_id acpi_ipmb_id[] = …; MODULE_DEVICE_TABLE(acpi, acpi_ipmb_id); static struct i2c_driver ipmb_driver = …; module_i2c_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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