![Corey Minyard](/assets/img/avatar_default.png)
Trying to make things more consistent and compliant with what should be in drivers. Signed-off-by: Corey Minyard <cminyard@mvista.com>
2120 lines
54 KiB
C
2120 lines
54 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* ipmi_ssif.c
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*
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* The interface to the IPMI driver for SMBus access to a SMBus
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* compliant device. Called SSIF by the IPMI spec.
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*
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* Author: Intel Corporation
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* Todd Davis <todd.c.davis@intel.com>
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*
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* Rewritten by Corey Minyard <minyard@acm.org> to support the
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* non-blocking I2C interface, add support for multi-part
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* transactions, add PEC support, and general clenaup.
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*
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* Copyright 2003 Intel Corporation
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* Copyright 2005 MontaVista Software
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*/
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/*
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* This file holds the "policy" for the interface to the SSIF state
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* machine. It does the configuration, handles timers and interrupts,
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* and drives the real SSIF state machine.
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*/
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/*
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* TODO: Figure out how to use SMB alerts. This will require a new
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* interface into the I2C driver, I believe.
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*/
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#define pr_fmt(fmt) "ipmi_ssif: " fmt
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#define dev_fmt(fmt) "ipmi_ssif: " fmt
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#if defined(MODVERSIONS)
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#include <linux/modversions.h>
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#endif
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/sched.h>
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#include <linux/seq_file.h>
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#include <linux/timer.h>
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#include <linux/delay.h>
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#include <linux/errno.h>
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#include <linux/spinlock.h>
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#include <linux/slab.h>
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#include <linux/list.h>
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#include <linux/i2c.h>
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#include <linux/ipmi_smi.h>
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#include <linux/init.h>
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#include <linux/dmi.h>
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#include <linux/kthread.h>
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#include <linux/acpi.h>
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#include <linux/ctype.h>
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#include <linux/time64.h>
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#include "ipmi_si_sm.h"
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#include "ipmi_dmi.h"
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#define DEVICE_NAME "ipmi_ssif"
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#define IPMI_GET_SYSTEM_INTERFACE_CAPABILITIES_CMD 0x57
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#define SSIF_IPMI_REQUEST 2
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#define SSIF_IPMI_MULTI_PART_REQUEST_START 6
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#define SSIF_IPMI_MULTI_PART_REQUEST_MIDDLE 7
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#define SSIF_IPMI_MULTI_PART_REQUEST_END 8
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#define SSIF_IPMI_RESPONSE 3
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#define SSIF_IPMI_MULTI_PART_RESPONSE_MIDDLE 9
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/* ssif_debug is a bit-field
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* SSIF_DEBUG_MSG - commands and their responses
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* SSIF_DEBUG_STATES - message states
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* SSIF_DEBUG_TIMING - Measure times between events in the driver
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*/
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#define SSIF_DEBUG_TIMING 4
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#define SSIF_DEBUG_STATE 2
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#define SSIF_DEBUG_MSG 1
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#define SSIF_NODEBUG 0
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#define SSIF_DEFAULT_DEBUG (SSIF_NODEBUG)
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/*
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* Timer values
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*/
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#define SSIF_MSG_USEC 20000 /* 20ms between message tries. */
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#define SSIF_MSG_PART_USEC 5000 /* 5ms for a message part */
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/* How many times to we retry sending/receiving the message. */
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#define SSIF_SEND_RETRIES 5
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#define SSIF_RECV_RETRIES 250
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#define SSIF_MSG_MSEC (SSIF_MSG_USEC / 1000)
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#define SSIF_MSG_JIFFIES ((SSIF_MSG_USEC * 1000) / TICK_NSEC)
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#define SSIF_MSG_PART_JIFFIES ((SSIF_MSG_PART_USEC * 1000) / TICK_NSEC)
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/*
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* Timeout for the watch, only used for get flag timer.
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*/
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#define SSIF_WATCH_MSG_TIMEOUT msecs_to_jiffies(10)
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#define SSIF_WATCH_WATCHDOG_TIMEOUT msecs_to_jiffies(250)
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enum ssif_intf_state {
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SSIF_NORMAL,
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SSIF_GETTING_FLAGS,
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SSIF_GETTING_EVENTS,
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SSIF_CLEARING_FLAGS,
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SSIF_GETTING_MESSAGES,
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/* FIXME - add watchdog stuff. */
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};
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#define SSIF_IDLE(ssif) ((ssif)->ssif_state == SSIF_NORMAL \
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&& (ssif)->curr_msg == NULL)
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/*
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* Indexes into stats[] in ssif_info below.
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*/
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enum ssif_stat_indexes {
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/* Number of total messages sent. */
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SSIF_STAT_sent_messages = 0,
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/*
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* Number of message parts sent. Messages may be broken into
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* parts if they are long.
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*/
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SSIF_STAT_sent_messages_parts,
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/*
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* Number of time a message was retried.
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*/
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SSIF_STAT_send_retries,
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/*
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* Number of times the send of a message failed.
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*/
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SSIF_STAT_send_errors,
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/*
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* Number of message responses received.
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*/
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SSIF_STAT_received_messages,
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/*
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* Number of message fragments received.
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*/
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SSIF_STAT_received_message_parts,
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/*
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* Number of times the receive of a message was retried.
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*/
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SSIF_STAT_receive_retries,
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/*
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* Number of errors receiving messages.
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*/
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SSIF_STAT_receive_errors,
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/*
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* Number of times a flag fetch was requested.
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*/
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SSIF_STAT_flag_fetches,
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/*
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* Number of times the hardware didn't follow the state machine.
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*/
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SSIF_STAT_hosed,
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/*
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* Number of received events.
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*/
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SSIF_STAT_events,
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/* Number of asyncronous messages received. */
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SSIF_STAT_incoming_messages,
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/* Number of watchdog pretimeouts. */
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SSIF_STAT_watchdog_pretimeouts,
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/* Number of alers received. */
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SSIF_STAT_alerts,
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/* Always add statistics before this value, it must be last. */
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SSIF_NUM_STATS
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};
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struct ssif_addr_info {
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struct i2c_board_info binfo;
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char *adapter_name;
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int debug;
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int slave_addr;
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enum ipmi_addr_src addr_src;
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union ipmi_smi_info_union addr_info;
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struct device *dev;
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struct i2c_client *client;
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struct i2c_client *added_client;
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struct mutex clients_mutex;
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struct list_head clients;
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struct list_head link;
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};
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struct ssif_info;
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typedef void (*ssif_i2c_done)(struct ssif_info *ssif_info, int result,
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unsigned char *data, unsigned int len);
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struct ssif_info {
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struct ipmi_smi *intf;
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spinlock_t lock;
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struct ipmi_smi_msg *waiting_msg;
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struct ipmi_smi_msg *curr_msg;
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enum ssif_intf_state ssif_state;
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unsigned long ssif_debug;
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struct ipmi_smi_handlers handlers;
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enum ipmi_addr_src addr_source; /* ACPI, PCI, SMBIOS, hardcode, etc. */
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union ipmi_smi_info_union addr_info;
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/*
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* Flags from the last GET_MSG_FLAGS command, used when an ATTN
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* is set to hold the flags until we are done handling everything
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* from the flags.
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*/
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#define RECEIVE_MSG_AVAIL 0x01
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#define EVENT_MSG_BUFFER_FULL 0x02
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#define WDT_PRE_TIMEOUT_INT 0x08
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unsigned char msg_flags;
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u8 global_enables;
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bool has_event_buffer;
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bool supports_alert;
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/*
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* Used to tell what we should do with alerts. If we are
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* waiting on a response, read the data immediately.
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*/
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bool got_alert;
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bool waiting_alert;
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/*
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* If set to true, this will request events the next time the
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* state machine is idle.
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*/
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bool req_events;
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/*
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* If set to true, this will request flags the next time the
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* state machine is idle.
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*/
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bool req_flags;
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/*
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* Used to perform timer operations when run-to-completion
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* mode is on. This is a countdown timer.
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*/
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int rtc_us_timer;
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/* Used for sending/receiving data. +1 for the length. */
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unsigned char data[IPMI_MAX_MSG_LENGTH + 1];
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unsigned int data_len;
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/* Temp receive buffer, gets copied into data. */
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unsigned char recv[I2C_SMBUS_BLOCK_MAX];
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struct i2c_client *client;
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ssif_i2c_done done_handler;
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/* Thread interface handling */
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struct task_struct *thread;
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struct completion wake_thread;
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bool stopping;
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int i2c_read_write;
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int i2c_command;
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unsigned char *i2c_data;
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unsigned int i2c_size;
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struct timer_list retry_timer;
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int retries_left;
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long watch_timeout; /* Timeout for flags check, 0 if off. */
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struct timer_list watch_timer; /* Flag fetch timer. */
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/* Info from SSIF cmd */
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unsigned char max_xmit_msg_size;
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unsigned char max_recv_msg_size;
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bool cmd8_works; /* See test_multipart_messages() for details. */
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unsigned int multi_support;
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int supports_pec;
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#define SSIF_NO_MULTI 0
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#define SSIF_MULTI_2_PART 1
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#define SSIF_MULTI_n_PART 2
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unsigned char *multi_data;
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unsigned int multi_len;
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unsigned int multi_pos;
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atomic_t stats[SSIF_NUM_STATS];
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};
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#define ssif_inc_stat(ssif, stat) \
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atomic_inc(&(ssif)->stats[SSIF_STAT_ ## stat])
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#define ssif_get_stat(ssif, stat) \
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((unsigned int) atomic_read(&(ssif)->stats[SSIF_STAT_ ## stat]))
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static bool initialized;
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static void return_hosed_msg(struct ssif_info *ssif_info,
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struct ipmi_smi_msg *msg);
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static void start_next_msg(struct ssif_info *ssif_info, unsigned long *flags);
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static int start_send(struct ssif_info *ssif_info,
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unsigned char *data,
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unsigned int len);
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static unsigned long *ipmi_ssif_lock_cond(struct ssif_info *ssif_info,
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unsigned long *flags)
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{
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spin_lock_irqsave(&ssif_info->lock, *flags);
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return flags;
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}
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static void ipmi_ssif_unlock_cond(struct ssif_info *ssif_info,
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unsigned long *flags)
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{
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spin_unlock_irqrestore(&ssif_info->lock, *flags);
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}
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static void deliver_recv_msg(struct ssif_info *ssif_info,
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struct ipmi_smi_msg *msg)
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{
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if (msg->rsp_size < 0) {
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return_hosed_msg(ssif_info, msg);
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dev_err(&ssif_info->client->dev,
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"%s: Malformed message: rsp_size = %d\n",
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__func__, msg->rsp_size);
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} else {
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ipmi_smi_msg_received(ssif_info->intf, msg);
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}
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}
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static void return_hosed_msg(struct ssif_info *ssif_info,
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struct ipmi_smi_msg *msg)
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{
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ssif_inc_stat(ssif_info, hosed);
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/* Make it a response */
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msg->rsp[0] = msg->data[0] | 4;
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msg->rsp[1] = msg->data[1];
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msg->rsp[2] = 0xFF; /* Unknown error. */
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msg->rsp_size = 3;
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deliver_recv_msg(ssif_info, msg);
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}
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/*
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* Must be called with the message lock held. This will release the
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* message lock. Note that the caller will check SSIF_IDLE and start a
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* new operation, so there is no need to check for new messages to
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* start in here.
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*/
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static void start_clear_flags(struct ssif_info *ssif_info, unsigned long *flags)
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{
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unsigned char msg[3];
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ssif_info->msg_flags &= ~WDT_PRE_TIMEOUT_INT;
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ssif_info->ssif_state = SSIF_CLEARING_FLAGS;
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ipmi_ssif_unlock_cond(ssif_info, flags);
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/* Make sure the watchdog pre-timeout flag is not set at startup. */
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msg[0] = (IPMI_NETFN_APP_REQUEST << 2);
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msg[1] = IPMI_CLEAR_MSG_FLAGS_CMD;
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msg[2] = WDT_PRE_TIMEOUT_INT;
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if (start_send(ssif_info, msg, 3) != 0) {
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/* Error, just go to normal state. */
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ssif_info->ssif_state = SSIF_NORMAL;
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}
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}
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static void start_flag_fetch(struct ssif_info *ssif_info, unsigned long *flags)
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{
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unsigned char mb[2];
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ssif_info->req_flags = false;
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ssif_info->ssif_state = SSIF_GETTING_FLAGS;
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ipmi_ssif_unlock_cond(ssif_info, flags);
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mb[0] = (IPMI_NETFN_APP_REQUEST << 2);
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mb[1] = IPMI_GET_MSG_FLAGS_CMD;
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if (start_send(ssif_info, mb, 2) != 0)
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ssif_info->ssif_state = SSIF_NORMAL;
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}
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static void check_start_send(struct ssif_info *ssif_info, unsigned long *flags,
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struct ipmi_smi_msg *msg)
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{
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if (start_send(ssif_info, msg->data, msg->data_size) != 0) {
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unsigned long oflags;
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flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
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ssif_info->curr_msg = NULL;
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ssif_info->ssif_state = SSIF_NORMAL;
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ipmi_ssif_unlock_cond(ssif_info, flags);
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ipmi_free_smi_msg(msg);
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}
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}
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static void start_event_fetch(struct ssif_info *ssif_info, unsigned long *flags)
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{
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struct ipmi_smi_msg *msg;
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ssif_info->req_events = false;
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msg = ipmi_alloc_smi_msg();
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if (!msg) {
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ssif_info->ssif_state = SSIF_NORMAL;
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ipmi_ssif_unlock_cond(ssif_info, flags);
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return;
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}
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ssif_info->curr_msg = msg;
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ssif_info->ssif_state = SSIF_GETTING_EVENTS;
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ipmi_ssif_unlock_cond(ssif_info, flags);
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msg->data[0] = (IPMI_NETFN_APP_REQUEST << 2);
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msg->data[1] = IPMI_READ_EVENT_MSG_BUFFER_CMD;
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msg->data_size = 2;
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check_start_send(ssif_info, flags, msg);
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}
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static void start_recv_msg_fetch(struct ssif_info *ssif_info,
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unsigned long *flags)
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{
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struct ipmi_smi_msg *msg;
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msg = ipmi_alloc_smi_msg();
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if (!msg) {
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ssif_info->ssif_state = SSIF_NORMAL;
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ipmi_ssif_unlock_cond(ssif_info, flags);
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return;
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}
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ssif_info->curr_msg = msg;
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ssif_info->ssif_state = SSIF_GETTING_MESSAGES;
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ipmi_ssif_unlock_cond(ssif_info, flags);
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msg->data[0] = (IPMI_NETFN_APP_REQUEST << 2);
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msg->data[1] = IPMI_GET_MSG_CMD;
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msg->data_size = 2;
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check_start_send(ssif_info, flags, msg);
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}
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/*
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* Must be called with the message lock held. This will release the
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* message lock. Note that the caller will check SSIF_IDLE and start a
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* new operation, so there is no need to check for new messages to
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* start in here.
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*/
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static void handle_flags(struct ssif_info *ssif_info, unsigned long *flags)
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{
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if (ssif_info->msg_flags & WDT_PRE_TIMEOUT_INT) {
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/* Watchdog pre-timeout */
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ssif_inc_stat(ssif_info, watchdog_pretimeouts);
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start_clear_flags(ssif_info, flags);
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ipmi_smi_watchdog_pretimeout(ssif_info->intf);
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} else if (ssif_info->msg_flags & RECEIVE_MSG_AVAIL)
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/* Messages available. */
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start_recv_msg_fetch(ssif_info, flags);
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else if (ssif_info->msg_flags & EVENT_MSG_BUFFER_FULL)
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/* Events available. */
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start_event_fetch(ssif_info, flags);
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else {
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ssif_info->ssif_state = SSIF_NORMAL;
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ipmi_ssif_unlock_cond(ssif_info, flags);
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}
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}
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static int ipmi_ssif_thread(void *data)
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{
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struct ssif_info *ssif_info = data;
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while (!kthread_should_stop()) {
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int result;
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/* Wait for something to do */
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result = wait_for_completion_interruptible(
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&ssif_info->wake_thread);
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if (ssif_info->stopping)
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break;
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if (result == -ERESTARTSYS)
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continue;
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init_completion(&ssif_info->wake_thread);
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if (ssif_info->i2c_read_write == I2C_SMBUS_WRITE) {
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result = i2c_smbus_write_block_data(
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ssif_info->client, ssif_info->i2c_command,
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ssif_info->i2c_data[0],
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ssif_info->i2c_data + 1);
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ssif_info->done_handler(ssif_info, result, NULL, 0);
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} else {
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result = i2c_smbus_read_block_data(
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ssif_info->client, ssif_info->i2c_command,
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ssif_info->i2c_data);
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if (result < 0)
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ssif_info->done_handler(ssif_info, result,
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NULL, 0);
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else
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ssif_info->done_handler(ssif_info, 0,
|
|
ssif_info->i2c_data,
|
|
result);
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ssif_i2c_send(struct ssif_info *ssif_info,
|
|
ssif_i2c_done handler,
|
|
int read_write, int command,
|
|
unsigned char *data, unsigned int size)
|
|
{
|
|
ssif_info->done_handler = handler;
|
|
|
|
ssif_info->i2c_read_write = read_write;
|
|
ssif_info->i2c_command = command;
|
|
ssif_info->i2c_data = data;
|
|
ssif_info->i2c_size = size;
|
|
complete(&ssif_info->wake_thread);
|
|
return 0;
|
|
}
|
|
|
|
|
|
static void msg_done_handler(struct ssif_info *ssif_info, int result,
|
|
unsigned char *data, unsigned int len);
|
|
|
|
static void start_get(struct ssif_info *ssif_info)
|
|
{
|
|
int rv;
|
|
|
|
ssif_info->rtc_us_timer = 0;
|
|
ssif_info->multi_pos = 0;
|
|
|
|
rv = ssif_i2c_send(ssif_info, msg_done_handler, I2C_SMBUS_READ,
|
|
SSIF_IPMI_RESPONSE,
|
|
ssif_info->recv, I2C_SMBUS_BLOCK_DATA);
|
|
if (rv < 0) {
|
|
/* request failed, just return the error. */
|
|
if (ssif_info->ssif_debug & SSIF_DEBUG_MSG)
|
|
dev_dbg(&ssif_info->client->dev,
|
|
"Error from i2c_non_blocking_op(5)\n");
|
|
|
|
msg_done_handler(ssif_info, -EIO, NULL, 0);
|
|
}
|
|
}
|
|
|
|
static void retry_timeout(struct timer_list *t)
|
|
{
|
|
struct ssif_info *ssif_info = from_timer(ssif_info, t, retry_timer);
|
|
unsigned long oflags, *flags;
|
|
bool waiting;
|
|
|
|
if (ssif_info->stopping)
|
|
return;
|
|
|
|
flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
|
|
waiting = ssif_info->waiting_alert;
|
|
ssif_info->waiting_alert = false;
|
|
ipmi_ssif_unlock_cond(ssif_info, flags);
|
|
|
|
if (waiting)
|
|
start_get(ssif_info);
|
|
}
|
|
|
|
static void watch_timeout(struct timer_list *t)
|
|
{
|
|
struct ssif_info *ssif_info = from_timer(ssif_info, t, watch_timer);
|
|
unsigned long oflags, *flags;
|
|
|
|
if (ssif_info->stopping)
|
|
return;
|
|
|
|
flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
|
|
if (ssif_info->watch_timeout) {
|
|
mod_timer(&ssif_info->watch_timer,
|
|
jiffies + ssif_info->watch_timeout);
|
|
if (SSIF_IDLE(ssif_info)) {
|
|
start_flag_fetch(ssif_info, flags); /* Releases lock */
|
|
return;
|
|
}
|
|
ssif_info->req_flags = true;
|
|
}
|
|
ipmi_ssif_unlock_cond(ssif_info, flags);
|
|
}
|
|
|
|
static void ssif_alert(struct i2c_client *client, enum i2c_alert_protocol type,
|
|
unsigned int data)
|
|
{
|
|
struct ssif_info *ssif_info = i2c_get_clientdata(client);
|
|
unsigned long oflags, *flags;
|
|
bool do_get = false;
|
|
|
|
if (type != I2C_PROTOCOL_SMBUS_ALERT)
|
|
return;
|
|
|
|
ssif_inc_stat(ssif_info, alerts);
|
|
|
|
flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
|
|
if (ssif_info->waiting_alert) {
|
|
ssif_info->waiting_alert = false;
|
|
del_timer(&ssif_info->retry_timer);
|
|
do_get = true;
|
|
} else if (ssif_info->curr_msg) {
|
|
ssif_info->got_alert = true;
|
|
}
|
|
ipmi_ssif_unlock_cond(ssif_info, flags);
|
|
if (do_get)
|
|
start_get(ssif_info);
|
|
}
|
|
|
|
static int start_resend(struct ssif_info *ssif_info);
|
|
|
|
static void msg_done_handler(struct ssif_info *ssif_info, int result,
|
|
unsigned char *data, unsigned int len)
|
|
{
|
|
struct ipmi_smi_msg *msg;
|
|
unsigned long oflags, *flags;
|
|
int rv;
|
|
|
|
/*
|
|
* We are single-threaded here, so no need for a lock until we
|
|
* start messing with driver states or the queues.
|
|
*/
|
|
|
|
if (result < 0) {
|
|
ssif_info->retries_left--;
|
|
if (ssif_info->retries_left > 0) {
|
|
ssif_inc_stat(ssif_info, receive_retries);
|
|
|
|
flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
|
|
ssif_info->waiting_alert = true;
|
|
ssif_info->rtc_us_timer = SSIF_MSG_USEC;
|
|
if (!ssif_info->stopping)
|
|
mod_timer(&ssif_info->retry_timer,
|
|
jiffies + SSIF_MSG_JIFFIES);
|
|
ipmi_ssif_unlock_cond(ssif_info, flags);
|
|
return;
|
|
}
|
|
|
|
ssif_inc_stat(ssif_info, receive_errors);
|
|
|
|
if (ssif_info->ssif_debug & SSIF_DEBUG_MSG)
|
|
dev_dbg(&ssif_info->client->dev,
|
|
"%s: Error %d\n", __func__, result);
|
|
len = 0;
|
|
goto continue_op;
|
|
}
|
|
|
|
if ((len > 1) && (ssif_info->multi_pos == 0)
|
|
&& (data[0] == 0x00) && (data[1] == 0x01)) {
|
|
/* Start of multi-part read. Start the next transaction. */
|
|
int i;
|
|
|
|
ssif_inc_stat(ssif_info, received_message_parts);
|
|
|
|
/* Remove the multi-part read marker. */
|
|
len -= 2;
|
|
data += 2;
|
|
for (i = 0; i < len; i++)
|
|
ssif_info->data[i] = data[i];
|
|
ssif_info->multi_len = len;
|
|
ssif_info->multi_pos = 1;
|
|
|
|
rv = ssif_i2c_send(ssif_info, msg_done_handler, I2C_SMBUS_READ,
|
|
SSIF_IPMI_MULTI_PART_RESPONSE_MIDDLE,
|
|
ssif_info->recv, I2C_SMBUS_BLOCK_DATA);
|
|
if (rv < 0) {
|
|
if (ssif_info->ssif_debug & SSIF_DEBUG_MSG)
|
|
dev_dbg(&ssif_info->client->dev,
|
|
"Error from i2c_non_blocking_op(1)\n");
|
|
|
|
result = -EIO;
|
|
} else
|
|
return;
|
|
} else if (ssif_info->multi_pos) {
|
|
/* Middle of multi-part read. Start the next transaction. */
|
|
int i;
|
|
unsigned char blocknum;
|
|
|
|
if (len == 0) {
|
|
result = -EIO;
|
|
if (ssif_info->ssif_debug & SSIF_DEBUG_MSG)
|
|
dev_dbg(&ssif_info->client->dev,
|
|
"Middle message with no data\n");
|
|
|
|
goto continue_op;
|
|
}
|
|
|
|
blocknum = data[0];
|
|
len--;
|
|
data++;
|
|
|
|
if (blocknum != 0xff && len != 31) {
|
|
/* All blocks but the last must have 31 data bytes. */
|
|
result = -EIO;
|
|
if (ssif_info->ssif_debug & SSIF_DEBUG_MSG)
|
|
dev_dbg(&ssif_info->client->dev,
|
|
"Received middle message <31\n");
|
|
|
|
goto continue_op;
|
|
}
|
|
|
|
if (ssif_info->multi_len + len > IPMI_MAX_MSG_LENGTH) {
|
|
/* Received message too big, abort the operation. */
|
|
result = -E2BIG;
|
|
if (ssif_info->ssif_debug & SSIF_DEBUG_MSG)
|
|
dev_dbg(&ssif_info->client->dev,
|
|
"Received message too big\n");
|
|
|
|
goto continue_op;
|
|
}
|
|
|
|
for (i = 0; i < len; i++)
|
|
ssif_info->data[i + ssif_info->multi_len] = data[i];
|
|
ssif_info->multi_len += len;
|
|
if (blocknum == 0xff) {
|
|
/* End of read */
|
|
len = ssif_info->multi_len;
|
|
data = ssif_info->data;
|
|
} else if (blocknum != ssif_info->multi_pos) {
|
|
/*
|
|
* Out of sequence block, just abort. Block
|
|
* numbers start at zero for the second block,
|
|
* but multi_pos starts at one, so the +1.
|
|
*/
|
|
result = -EIO;
|
|
} else {
|
|
ssif_inc_stat(ssif_info, received_message_parts);
|
|
|
|
ssif_info->multi_pos++;
|
|
|
|
rv = ssif_i2c_send(ssif_info, msg_done_handler,
|
|
I2C_SMBUS_READ,
|
|
SSIF_IPMI_MULTI_PART_RESPONSE_MIDDLE,
|
|
ssif_info->recv,
|
|
I2C_SMBUS_BLOCK_DATA);
|
|
if (rv < 0) {
|
|
if (ssif_info->ssif_debug & SSIF_DEBUG_MSG)
|
|
dev_dbg(&ssif_info->client->dev,
|
|
"Error from ssif_i2c_send\n");
|
|
|
|
result = -EIO;
|
|
} else
|
|
return;
|
|
}
|
|
}
|
|
|
|
continue_op:
|
|
if (result < 0) {
|
|
ssif_inc_stat(ssif_info, receive_errors);
|
|
} else {
|
|
ssif_inc_stat(ssif_info, received_messages);
|
|
ssif_inc_stat(ssif_info, received_message_parts);
|
|
}
|
|
|
|
if (ssif_info->ssif_debug & SSIF_DEBUG_STATE)
|
|
dev_dbg(&ssif_info->client->dev,
|
|
"DONE 1: state = %d, result=%d\n",
|
|
ssif_info->ssif_state, result);
|
|
|
|
flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
|
|
msg = ssif_info->curr_msg;
|
|
if (msg) {
|
|
msg->rsp_size = len;
|
|
if (msg->rsp_size > IPMI_MAX_MSG_LENGTH)
|
|
msg->rsp_size = IPMI_MAX_MSG_LENGTH;
|
|
memcpy(msg->rsp, data, msg->rsp_size);
|
|
ssif_info->curr_msg = NULL;
|
|
}
|
|
|
|
switch (ssif_info->ssif_state) {
|
|
case SSIF_NORMAL:
|
|
ipmi_ssif_unlock_cond(ssif_info, flags);
|
|
if (!msg)
|
|
break;
|
|
|
|
if (result < 0)
|
|
return_hosed_msg(ssif_info, msg);
|
|
else
|
|
deliver_recv_msg(ssif_info, msg);
|
|
break;
|
|
|
|
case SSIF_GETTING_FLAGS:
|
|
/* We got the flags from the SSIF, now handle them. */
|
|
if ((result < 0) || (len < 4) || (data[2] != 0)) {
|
|
/*
|
|
* Error fetching flags, or invalid length,
|
|
* just give up for now.
|
|
*/
|
|
ssif_info->ssif_state = SSIF_NORMAL;
|
|
ipmi_ssif_unlock_cond(ssif_info, flags);
|
|
dev_warn(&ssif_info->client->dev,
|
|
"Error getting flags: %d %d, %x\n",
|
|
result, len, (len >= 3) ? data[2] : 0);
|
|
} else if (data[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2
|
|
|| data[1] != IPMI_GET_MSG_FLAGS_CMD) {
|
|
/*
|
|
* Don't abort here, maybe it was a queued
|
|
* response to a previous command.
|
|
*/
|
|
ipmi_ssif_unlock_cond(ssif_info, flags);
|
|
dev_warn(&ssif_info->client->dev,
|
|
"Invalid response getting flags: %x %x\n",
|
|
data[0], data[1]);
|
|
} else {
|
|
ssif_inc_stat(ssif_info, flag_fetches);
|
|
ssif_info->msg_flags = data[3];
|
|
handle_flags(ssif_info, flags);
|
|
}
|
|
break;
|
|
|
|
case SSIF_CLEARING_FLAGS:
|
|
/* We cleared the flags. */
|
|
if ((result < 0) || (len < 3) || (data[2] != 0)) {
|
|
/* Error clearing flags */
|
|
dev_warn(&ssif_info->client->dev,
|
|
"Error clearing flags: %d %d, %x\n",
|
|
result, len, (len >= 3) ? data[2] : 0);
|
|
} else if (data[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2
|
|
|| data[1] != IPMI_CLEAR_MSG_FLAGS_CMD) {
|
|
dev_warn(&ssif_info->client->dev,
|
|
"Invalid response clearing flags: %x %x\n",
|
|
data[0], data[1]);
|
|
}
|
|
ssif_info->ssif_state = SSIF_NORMAL;
|
|
ipmi_ssif_unlock_cond(ssif_info, flags);
|
|
break;
|
|
|
|
case SSIF_GETTING_EVENTS:
|
|
if ((result < 0) || (len < 3) || (msg->rsp[2] != 0)) {
|
|
/* Error getting event, probably done. */
|
|
msg->done(msg);
|
|
|
|
/* Take off the event flag. */
|
|
ssif_info->msg_flags &= ~EVENT_MSG_BUFFER_FULL;
|
|
handle_flags(ssif_info, flags);
|
|
} else if (msg->rsp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2
|
|
|| msg->rsp[1] != IPMI_READ_EVENT_MSG_BUFFER_CMD) {
|
|
dev_warn(&ssif_info->client->dev,
|
|
"Invalid response getting events: %x %x\n",
|
|
msg->rsp[0], msg->rsp[1]);
|
|
msg->done(msg);
|
|
/* Take off the event flag. */
|
|
ssif_info->msg_flags &= ~EVENT_MSG_BUFFER_FULL;
|
|
handle_flags(ssif_info, flags);
|
|
} else {
|
|
handle_flags(ssif_info, flags);
|
|
ssif_inc_stat(ssif_info, events);
|
|
deliver_recv_msg(ssif_info, msg);
|
|
}
|
|
break;
|
|
|
|
case SSIF_GETTING_MESSAGES:
|
|
if ((result < 0) || (len < 3) || (msg->rsp[2] != 0)) {
|
|
/* Error getting event, probably done. */
|
|
msg->done(msg);
|
|
|
|
/* Take off the msg flag. */
|
|
ssif_info->msg_flags &= ~RECEIVE_MSG_AVAIL;
|
|
handle_flags(ssif_info, flags);
|
|
} else if (msg->rsp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2
|
|
|| msg->rsp[1] != IPMI_GET_MSG_CMD) {
|
|
dev_warn(&ssif_info->client->dev,
|
|
"Invalid response clearing flags: %x %x\n",
|
|
msg->rsp[0], msg->rsp[1]);
|
|
msg->done(msg);
|
|
|
|
/* Take off the msg flag. */
|
|
ssif_info->msg_flags &= ~RECEIVE_MSG_AVAIL;
|
|
handle_flags(ssif_info, flags);
|
|
} else {
|
|
ssif_inc_stat(ssif_info, incoming_messages);
|
|
handle_flags(ssif_info, flags);
|
|
deliver_recv_msg(ssif_info, msg);
|
|
}
|
|
break;
|
|
}
|
|
|
|
flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
|
|
if (SSIF_IDLE(ssif_info) && !ssif_info->stopping) {
|
|
if (ssif_info->req_events)
|
|
start_event_fetch(ssif_info, flags);
|
|
else if (ssif_info->req_flags)
|
|
start_flag_fetch(ssif_info, flags);
|
|
else
|
|
start_next_msg(ssif_info, flags);
|
|
} else
|
|
ipmi_ssif_unlock_cond(ssif_info, flags);
|
|
|
|
if (ssif_info->ssif_debug & SSIF_DEBUG_STATE)
|
|
dev_dbg(&ssif_info->client->dev,
|
|
"DONE 2: state = %d.\n", ssif_info->ssif_state);
|
|
}
|
|
|
|
static void msg_written_handler(struct ssif_info *ssif_info, int result,
|
|
unsigned char *data, unsigned int len)
|
|
{
|
|
int rv;
|
|
|
|
/* We are single-threaded here, so no need for a lock. */
|
|
if (result < 0) {
|
|
ssif_info->retries_left--;
|
|
if (ssif_info->retries_left > 0) {
|
|
if (!start_resend(ssif_info)) {
|
|
ssif_inc_stat(ssif_info, send_retries);
|
|
return;
|
|
}
|
|
/* request failed, just return the error. */
|
|
ssif_inc_stat(ssif_info, send_errors);
|
|
|
|
if (ssif_info->ssif_debug & SSIF_DEBUG_MSG)
|
|
dev_dbg(&ssif_info->client->dev,
|
|
"%s: Out of retries\n", __func__);
|
|
msg_done_handler(ssif_info, -EIO, NULL, 0);
|
|
return;
|
|
}
|
|
|
|
ssif_inc_stat(ssif_info, send_errors);
|
|
|
|
/*
|
|
* Got an error on transmit, let the done routine
|
|
* handle it.
|
|
*/
|
|
if (ssif_info->ssif_debug & SSIF_DEBUG_MSG)
|
|
dev_dbg(&ssif_info->client->dev,
|
|
"%s: Error %d\n", __func__, result);
|
|
|
|
msg_done_handler(ssif_info, result, NULL, 0);
|
|
return;
|
|
}
|
|
|
|
if (ssif_info->multi_data) {
|
|
/*
|
|
* In the middle of a multi-data write. See the comment
|
|
* in the SSIF_MULTI_n_PART case in the probe function
|
|
* for details on the intricacies of this.
|
|
*/
|
|
int left, to_write;
|
|
unsigned char *data_to_send;
|
|
unsigned char cmd;
|
|
|
|
ssif_inc_stat(ssif_info, sent_messages_parts);
|
|
|
|
left = ssif_info->multi_len - ssif_info->multi_pos;
|
|
to_write = left;
|
|
if (to_write > 32)
|
|
to_write = 32;
|
|
/* Length byte. */
|
|
ssif_info->multi_data[ssif_info->multi_pos] = to_write;
|
|
data_to_send = ssif_info->multi_data + ssif_info->multi_pos;
|
|
ssif_info->multi_pos += to_write;
|
|
cmd = SSIF_IPMI_MULTI_PART_REQUEST_MIDDLE;
|
|
if (ssif_info->cmd8_works) {
|
|
if (left == to_write) {
|
|
cmd = SSIF_IPMI_MULTI_PART_REQUEST_END;
|
|
ssif_info->multi_data = NULL;
|
|
}
|
|
} else if (to_write < 32) {
|
|
ssif_info->multi_data = NULL;
|
|
}
|
|
|
|
rv = ssif_i2c_send(ssif_info, msg_written_handler,
|
|
I2C_SMBUS_WRITE, cmd,
|
|
data_to_send, I2C_SMBUS_BLOCK_DATA);
|
|
if (rv < 0) {
|
|
/* request failed, just return the error. */
|
|
ssif_inc_stat(ssif_info, send_errors);
|
|
|
|
if (ssif_info->ssif_debug & SSIF_DEBUG_MSG)
|
|
dev_dbg(&ssif_info->client->dev,
|
|
"Error from i2c_non_blocking_op(3)\n");
|
|
msg_done_handler(ssif_info, -EIO, NULL, 0);
|
|
}
|
|
} else {
|
|
/* Ready to request the result. */
|
|
unsigned long oflags, *flags;
|
|
|
|
ssif_inc_stat(ssif_info, sent_messages);
|
|
ssif_inc_stat(ssif_info, sent_messages_parts);
|
|
|
|
flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
|
|
if (ssif_info->got_alert) {
|
|
/* The result is already ready, just start it. */
|
|
ssif_info->got_alert = false;
|
|
ipmi_ssif_unlock_cond(ssif_info, flags);
|
|
start_get(ssif_info);
|
|
} else {
|
|
/* Wait a jiffie then request the next message */
|
|
ssif_info->waiting_alert = true;
|
|
ssif_info->retries_left = SSIF_RECV_RETRIES;
|
|
ssif_info->rtc_us_timer = SSIF_MSG_PART_USEC;
|
|
if (!ssif_info->stopping)
|
|
mod_timer(&ssif_info->retry_timer,
|
|
jiffies + SSIF_MSG_PART_JIFFIES);
|
|
ipmi_ssif_unlock_cond(ssif_info, flags);
|
|
}
|
|
}
|
|
}
|
|
|
|
static int start_resend(struct ssif_info *ssif_info)
|
|
{
|
|
int rv;
|
|
int command;
|
|
|
|
ssif_info->got_alert = false;
|
|
|
|
if (ssif_info->data_len > 32) {
|
|
command = SSIF_IPMI_MULTI_PART_REQUEST_START;
|
|
ssif_info->multi_data = ssif_info->data;
|
|
ssif_info->multi_len = ssif_info->data_len;
|
|
/*
|
|
* Subtle thing, this is 32, not 33, because we will
|
|
* overwrite the thing at position 32 (which was just
|
|
* transmitted) with the new length.
|
|
*/
|
|
ssif_info->multi_pos = 32;
|
|
ssif_info->data[0] = 32;
|
|
} else {
|
|
ssif_info->multi_data = NULL;
|
|
command = SSIF_IPMI_REQUEST;
|
|
ssif_info->data[0] = ssif_info->data_len;
|
|
}
|
|
|
|
rv = ssif_i2c_send(ssif_info, msg_written_handler, I2C_SMBUS_WRITE,
|
|
command, ssif_info->data, I2C_SMBUS_BLOCK_DATA);
|
|
if (rv && (ssif_info->ssif_debug & SSIF_DEBUG_MSG))
|
|
dev_dbg(&ssif_info->client->dev,
|
|
"Error from i2c_non_blocking_op(4)\n");
|
|
return rv;
|
|
}
|
|
|
|
static int start_send(struct ssif_info *ssif_info,
|
|
unsigned char *data,
|
|
unsigned int len)
|
|
{
|
|
if (len > IPMI_MAX_MSG_LENGTH)
|
|
return -E2BIG;
|
|
if (len > ssif_info->max_xmit_msg_size)
|
|
return -E2BIG;
|
|
|
|
ssif_info->retries_left = SSIF_SEND_RETRIES;
|
|
memcpy(ssif_info->data + 1, data, len);
|
|
ssif_info->data_len = len;
|
|
return start_resend(ssif_info);
|
|
}
|
|
|
|
/* Must be called with the message lock held. */
|
|
static void start_next_msg(struct ssif_info *ssif_info, unsigned long *flags)
|
|
{
|
|
struct ipmi_smi_msg *msg;
|
|
unsigned long oflags;
|
|
|
|
restart:
|
|
if (!SSIF_IDLE(ssif_info)) {
|
|
ipmi_ssif_unlock_cond(ssif_info, flags);
|
|
return;
|
|
}
|
|
|
|
if (!ssif_info->waiting_msg) {
|
|
ssif_info->curr_msg = NULL;
|
|
ipmi_ssif_unlock_cond(ssif_info, flags);
|
|
} else {
|
|
int rv;
|
|
|
|
ssif_info->curr_msg = ssif_info->waiting_msg;
|
|
ssif_info->waiting_msg = NULL;
|
|
ipmi_ssif_unlock_cond(ssif_info, flags);
|
|
rv = start_send(ssif_info,
|
|
ssif_info->curr_msg->data,
|
|
ssif_info->curr_msg->data_size);
|
|
if (rv) {
|
|
msg = ssif_info->curr_msg;
|
|
ssif_info->curr_msg = NULL;
|
|
return_hosed_msg(ssif_info, msg);
|
|
flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
|
|
goto restart;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void sender(void *send_info,
|
|
struct ipmi_smi_msg *msg)
|
|
{
|
|
struct ssif_info *ssif_info = (struct ssif_info *) send_info;
|
|
unsigned long oflags, *flags;
|
|
|
|
BUG_ON(ssif_info->waiting_msg);
|
|
ssif_info->waiting_msg = msg;
|
|
|
|
flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
|
|
start_next_msg(ssif_info, flags);
|
|
|
|
if (ssif_info->ssif_debug & SSIF_DEBUG_TIMING) {
|
|
struct timespec64 t;
|
|
|
|
ktime_get_real_ts64(&t);
|
|
dev_dbg(&ssif_info->client->dev,
|
|
"**Enqueue %02x %02x: %lld.%6.6ld\n",
|
|
msg->data[0], msg->data[1],
|
|
(long long)t.tv_sec, (long)t.tv_nsec / NSEC_PER_USEC);
|
|
}
|
|
}
|
|
|
|
static int get_smi_info(void *send_info, struct ipmi_smi_info *data)
|
|
{
|
|
struct ssif_info *ssif_info = send_info;
|
|
|
|
data->addr_src = ssif_info->addr_source;
|
|
data->dev = &ssif_info->client->dev;
|
|
data->addr_info = ssif_info->addr_info;
|
|
get_device(data->dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Upper layer wants us to request events.
|
|
*/
|
|
static void request_events(void *send_info)
|
|
{
|
|
struct ssif_info *ssif_info = (struct ssif_info *) send_info;
|
|
unsigned long oflags, *flags;
|
|
|
|
if (!ssif_info->has_event_buffer)
|
|
return;
|
|
|
|
flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
|
|
ssif_info->req_events = true;
|
|
ipmi_ssif_unlock_cond(ssif_info, flags);
|
|
}
|
|
|
|
/*
|
|
* Upper layer is changing the flag saying whether we need to request
|
|
* flags periodically or not.
|
|
*/
|
|
static void ssif_set_need_watch(void *send_info, unsigned int watch_mask)
|
|
{
|
|
struct ssif_info *ssif_info = (struct ssif_info *) send_info;
|
|
unsigned long oflags, *flags;
|
|
long timeout = 0;
|
|
|
|
if (watch_mask & IPMI_WATCH_MASK_CHECK_MESSAGES)
|
|
timeout = SSIF_WATCH_MSG_TIMEOUT;
|
|
else if (watch_mask)
|
|
timeout = SSIF_WATCH_WATCHDOG_TIMEOUT;
|
|
|
|
flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
|
|
if (timeout != ssif_info->watch_timeout) {
|
|
ssif_info->watch_timeout = timeout;
|
|
if (ssif_info->watch_timeout)
|
|
mod_timer(&ssif_info->watch_timer,
|
|
jiffies + ssif_info->watch_timeout);
|
|
}
|
|
ipmi_ssif_unlock_cond(ssif_info, flags);
|
|
}
|
|
|
|
static int ssif_start_processing(void *send_info,
|
|
struct ipmi_smi *intf)
|
|
{
|
|
struct ssif_info *ssif_info = send_info;
|
|
|
|
ssif_info->intf = intf;
|
|
|
|
return 0;
|
|
}
|
|
|
|
#define MAX_SSIF_BMCS 4
|
|
|
|
static unsigned short addr[MAX_SSIF_BMCS];
|
|
static int num_addrs;
|
|
module_param_array(addr, ushort, &num_addrs, 0);
|
|
MODULE_PARM_DESC(addr, "The addresses to scan for IPMI BMCs on the SSIFs.");
|
|
|
|
static char *adapter_name[MAX_SSIF_BMCS];
|
|
static int num_adapter_names;
|
|
module_param_array(adapter_name, charp, &num_adapter_names, 0);
|
|
MODULE_PARM_DESC(adapter_name, "The string name of the I2C device that has the BMC. By default all devices are scanned.");
|
|
|
|
static int slave_addrs[MAX_SSIF_BMCS];
|
|
static int num_slave_addrs;
|
|
module_param_array(slave_addrs, int, &num_slave_addrs, 0);
|
|
MODULE_PARM_DESC(slave_addrs,
|
|
"The default IPMB slave address for the controller.");
|
|
|
|
static bool alerts_broken;
|
|
module_param(alerts_broken, bool, 0);
|
|
MODULE_PARM_DESC(alerts_broken, "Don't enable alerts for the controller.");
|
|
|
|
/*
|
|
* Bit 0 enables message debugging, bit 1 enables state debugging, and
|
|
* bit 2 enables timing debugging. This is an array indexed by
|
|
* interface number"
|
|
*/
|
|
static int dbg[MAX_SSIF_BMCS];
|
|
static int num_dbg;
|
|
module_param_array(dbg, int, &num_dbg, 0);
|
|
MODULE_PARM_DESC(dbg, "Turn on debugging.");
|
|
|
|
static bool ssif_dbg_probe;
|
|
module_param_named(dbg_probe, ssif_dbg_probe, bool, 0);
|
|
MODULE_PARM_DESC(dbg_probe, "Enable debugging of probing of adapters.");
|
|
|
|
static bool ssif_tryacpi = true;
|
|
module_param_named(tryacpi, ssif_tryacpi, bool, 0);
|
|
MODULE_PARM_DESC(tryacpi, "Setting this to zero will disable the default scan of the interfaces identified via ACPI");
|
|
|
|
static bool ssif_trydmi = true;
|
|
module_param_named(trydmi, ssif_trydmi, bool, 0);
|
|
MODULE_PARM_DESC(trydmi, "Setting this to zero will disable the default scan of the interfaces identified via DMI (SMBIOS)");
|
|
|
|
static DEFINE_MUTEX(ssif_infos_mutex);
|
|
static LIST_HEAD(ssif_infos);
|
|
|
|
#define IPMI_SSIF_ATTR(name) \
|
|
static ssize_t ipmi_##name##_show(struct device *dev, \
|
|
struct device_attribute *attr, \
|
|
char *buf) \
|
|
{ \
|
|
struct ssif_info *ssif_info = dev_get_drvdata(dev); \
|
|
\
|
|
return snprintf(buf, 10, "%u\n", ssif_get_stat(ssif_info, name));\
|
|
} \
|
|
static DEVICE_ATTR(name, S_IRUGO, ipmi_##name##_show, NULL)
|
|
|
|
static ssize_t ipmi_type_show(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
return snprintf(buf, 10, "ssif\n");
|
|
}
|
|
static DEVICE_ATTR(type, S_IRUGO, ipmi_type_show, NULL);
|
|
|
|
IPMI_SSIF_ATTR(sent_messages);
|
|
IPMI_SSIF_ATTR(sent_messages_parts);
|
|
IPMI_SSIF_ATTR(send_retries);
|
|
IPMI_SSIF_ATTR(send_errors);
|
|
IPMI_SSIF_ATTR(received_messages);
|
|
IPMI_SSIF_ATTR(received_message_parts);
|
|
IPMI_SSIF_ATTR(receive_retries);
|
|
IPMI_SSIF_ATTR(receive_errors);
|
|
IPMI_SSIF_ATTR(flag_fetches);
|
|
IPMI_SSIF_ATTR(hosed);
|
|
IPMI_SSIF_ATTR(events);
|
|
IPMI_SSIF_ATTR(watchdog_pretimeouts);
|
|
IPMI_SSIF_ATTR(alerts);
|
|
|
|
static struct attribute *ipmi_ssif_dev_attrs[] = {
|
|
&dev_attr_type.attr,
|
|
&dev_attr_sent_messages.attr,
|
|
&dev_attr_sent_messages_parts.attr,
|
|
&dev_attr_send_retries.attr,
|
|
&dev_attr_send_errors.attr,
|
|
&dev_attr_received_messages.attr,
|
|
&dev_attr_received_message_parts.attr,
|
|
&dev_attr_receive_retries.attr,
|
|
&dev_attr_receive_errors.attr,
|
|
&dev_attr_flag_fetches.attr,
|
|
&dev_attr_hosed.attr,
|
|
&dev_attr_events.attr,
|
|
&dev_attr_watchdog_pretimeouts.attr,
|
|
&dev_attr_alerts.attr,
|
|
NULL
|
|
};
|
|
|
|
static const struct attribute_group ipmi_ssif_dev_attr_group = {
|
|
.attrs = ipmi_ssif_dev_attrs,
|
|
};
|
|
|
|
static void shutdown_ssif(void *send_info)
|
|
{
|
|
struct ssif_info *ssif_info = send_info;
|
|
|
|
device_remove_group(&ssif_info->client->dev, &ipmi_ssif_dev_attr_group);
|
|
dev_set_drvdata(&ssif_info->client->dev, NULL);
|
|
|
|
/* make sure the driver is not looking for flags any more. */
|
|
while (ssif_info->ssif_state != SSIF_NORMAL)
|
|
schedule_timeout(1);
|
|
|
|
ssif_info->stopping = true;
|
|
del_timer_sync(&ssif_info->watch_timer);
|
|
del_timer_sync(&ssif_info->retry_timer);
|
|
if (ssif_info->thread) {
|
|
complete(&ssif_info->wake_thread);
|
|
kthread_stop(ssif_info->thread);
|
|
}
|
|
}
|
|
|
|
static int ssif_remove(struct i2c_client *client)
|
|
{
|
|
struct ssif_info *ssif_info = i2c_get_clientdata(client);
|
|
struct ssif_addr_info *addr_info;
|
|
|
|
if (!ssif_info)
|
|
return 0;
|
|
|
|
/*
|
|
* After this point, we won't deliver anything asychronously
|
|
* to the message handler. We can unregister ourself.
|
|
*/
|
|
ipmi_unregister_smi(ssif_info->intf);
|
|
|
|
list_for_each_entry(addr_info, &ssif_infos, link) {
|
|
if (addr_info->client == client) {
|
|
addr_info->client = NULL;
|
|
break;
|
|
}
|
|
}
|
|
|
|
kfree(ssif_info);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int read_response(struct i2c_client *client, unsigned char *resp)
|
|
{
|
|
int ret = -ENODEV, retry_cnt = SSIF_RECV_RETRIES;
|
|
|
|
while (retry_cnt > 0) {
|
|
ret = i2c_smbus_read_block_data(client, SSIF_IPMI_RESPONSE,
|
|
resp);
|
|
if (ret > 0)
|
|
break;
|
|
msleep(SSIF_MSG_MSEC);
|
|
retry_cnt--;
|
|
if (retry_cnt <= 0)
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int do_cmd(struct i2c_client *client, int len, unsigned char *msg,
|
|
int *resp_len, unsigned char *resp)
|
|
{
|
|
int retry_cnt;
|
|
int ret;
|
|
|
|
retry_cnt = SSIF_SEND_RETRIES;
|
|
retry1:
|
|
ret = i2c_smbus_write_block_data(client, SSIF_IPMI_REQUEST, len, msg);
|
|
if (ret) {
|
|
retry_cnt--;
|
|
if (retry_cnt > 0)
|
|
goto retry1;
|
|
return -ENODEV;
|
|
}
|
|
|
|
ret = read_response(client, resp);
|
|
if (ret > 0) {
|
|
/* Validate that the response is correct. */
|
|
if (ret < 3 ||
|
|
(resp[0] != (msg[0] | (1 << 2))) ||
|
|
(resp[1] != msg[1]))
|
|
ret = -EINVAL;
|
|
else if (ret > IPMI_MAX_MSG_LENGTH) {
|
|
ret = -E2BIG;
|
|
} else {
|
|
*resp_len = ret;
|
|
ret = 0;
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int ssif_detect(struct i2c_client *client, struct i2c_board_info *info)
|
|
{
|
|
unsigned char *resp;
|
|
unsigned char msg[3];
|
|
int rv;
|
|
int len;
|
|
|
|
resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL);
|
|
if (!resp)
|
|
return -ENOMEM;
|
|
|
|
/* Do a Get Device ID command, since it is required. */
|
|
msg[0] = IPMI_NETFN_APP_REQUEST << 2;
|
|
msg[1] = IPMI_GET_DEVICE_ID_CMD;
|
|
rv = do_cmd(client, 2, msg, &len, resp);
|
|
if (rv)
|
|
rv = -ENODEV;
|
|
else
|
|
strlcpy(info->type, DEVICE_NAME, I2C_NAME_SIZE);
|
|
kfree(resp);
|
|
return rv;
|
|
}
|
|
|
|
static int strcmp_nospace(char *s1, char *s2)
|
|
{
|
|
while (*s1 && *s2) {
|
|
while (isspace(*s1))
|
|
s1++;
|
|
while (isspace(*s2))
|
|
s2++;
|
|
if (*s1 > *s2)
|
|
return 1;
|
|
if (*s1 < *s2)
|
|
return -1;
|
|
s1++;
|
|
s2++;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static struct ssif_addr_info *ssif_info_find(unsigned short addr,
|
|
char *adapter_name,
|
|
bool match_null_name)
|
|
{
|
|
struct ssif_addr_info *info, *found = NULL;
|
|
|
|
restart:
|
|
list_for_each_entry(info, &ssif_infos, link) {
|
|
if (info->binfo.addr == addr) {
|
|
if (info->adapter_name || adapter_name) {
|
|
if (!info->adapter_name != !adapter_name) {
|
|
/* One is NULL and one is not */
|
|
continue;
|
|
}
|
|
if (adapter_name &&
|
|
strcmp_nospace(info->adapter_name,
|
|
adapter_name))
|
|
/* Names do not match */
|
|
continue;
|
|
}
|
|
found = info;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!found && match_null_name) {
|
|
/* Try to get an exact match first, then try with a NULL name */
|
|
adapter_name = NULL;
|
|
match_null_name = false;
|
|
goto restart;
|
|
}
|
|
|
|
return found;
|
|
}
|
|
|
|
static bool check_acpi(struct ssif_info *ssif_info, struct device *dev)
|
|
{
|
|
#ifdef CONFIG_ACPI
|
|
acpi_handle acpi_handle;
|
|
|
|
acpi_handle = ACPI_HANDLE(dev);
|
|
if (acpi_handle) {
|
|
ssif_info->addr_source = SI_ACPI;
|
|
ssif_info->addr_info.acpi_info.acpi_handle = acpi_handle;
|
|
return true;
|
|
}
|
|
#endif
|
|
return false;
|
|
}
|
|
|
|
static int find_slave_address(struct i2c_client *client, int slave_addr)
|
|
{
|
|
#ifdef CONFIG_IPMI_DMI_DECODE
|
|
if (!slave_addr)
|
|
slave_addr = ipmi_dmi_get_slave_addr(
|
|
SI_TYPE_INVALID,
|
|
i2c_adapter_id(client->adapter),
|
|
client->addr);
|
|
#endif
|
|
|
|
return slave_addr;
|
|
}
|
|
|
|
static int start_multipart_test(struct i2c_client *client,
|
|
unsigned char *msg, bool do_middle)
|
|
{
|
|
int retry_cnt = SSIF_SEND_RETRIES, ret;
|
|
|
|
retry_write:
|
|
ret = i2c_smbus_write_block_data(client,
|
|
SSIF_IPMI_MULTI_PART_REQUEST_START,
|
|
32, msg);
|
|
if (ret) {
|
|
retry_cnt--;
|
|
if (retry_cnt > 0)
|
|
goto retry_write;
|
|
dev_err(&client->dev, "Could not write multi-part start, though the BMC said it could handle it. Just limit sends to one part.\n");
|
|
return ret;
|
|
}
|
|
|
|
if (!do_middle)
|
|
return 0;
|
|
|
|
ret = i2c_smbus_write_block_data(client,
|
|
SSIF_IPMI_MULTI_PART_REQUEST_MIDDLE,
|
|
32, msg + 32);
|
|
if (ret) {
|
|
dev_err(&client->dev, "Could not write multi-part middle, though the BMC said it could handle it. Just limit sends to one part.\n");
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void test_multipart_messages(struct i2c_client *client,
|
|
struct ssif_info *ssif_info,
|
|
unsigned char *resp)
|
|
{
|
|
unsigned char msg[65];
|
|
int ret;
|
|
bool do_middle;
|
|
|
|
if (ssif_info->max_xmit_msg_size <= 32)
|
|
return;
|
|
|
|
do_middle = ssif_info->max_xmit_msg_size > 63;
|
|
|
|
memset(msg, 0, sizeof(msg));
|
|
msg[0] = IPMI_NETFN_APP_REQUEST << 2;
|
|
msg[1] = IPMI_GET_DEVICE_ID_CMD;
|
|
|
|
/*
|
|
* The specification is all messed up dealing with sending
|
|
* multi-part messages. Per what the specification says, it
|
|
* is impossible to send a message that is a multiple of 32
|
|
* bytes, except for 32 itself. It talks about a "start"
|
|
* transaction (cmd=6) that must be 32 bytes, "middle"
|
|
* transaction (cmd=7) that must be 32 bytes, and an "end"
|
|
* transaction. The "end" transaction is shown as cmd=7 in
|
|
* the text, but if that's the case there is no way to
|
|
* differentiate between a middle and end part except the
|
|
* length being less than 32. But there is a table at the far
|
|
* end of the section (that I had never noticed until someone
|
|
* pointed it out to me) that mentions it as cmd=8.
|
|
*
|
|
* After some thought, I think the example is wrong and the
|
|
* end transaction should be cmd=8. But some systems don't
|
|
* implement cmd=8, they use a zero-length end transaction,
|
|
* even though that violates the SMBus specification.
|
|
*
|
|
* So, to work around this, this code tests if cmd=8 works.
|
|
* If it does, then we use that. If not, it tests zero-
|
|
* byte end transactions. If that works, good. If not,
|
|
* we only allow 63-byte transactions max.
|
|
*/
|
|
|
|
ret = start_multipart_test(client, msg, do_middle);
|
|
if (ret)
|
|
goto out_no_multi_part;
|
|
|
|
ret = i2c_smbus_write_block_data(client,
|
|
SSIF_IPMI_MULTI_PART_REQUEST_END,
|
|
1, msg + 64);
|
|
|
|
if (!ret)
|
|
ret = read_response(client, resp);
|
|
|
|
if (ret > 0) {
|
|
/* End transactions work, we are good. */
|
|
ssif_info->cmd8_works = true;
|
|
return;
|
|
}
|
|
|
|
ret = start_multipart_test(client, msg, do_middle);
|
|
if (ret) {
|
|
dev_err(&client->dev, "Second multipart test failed.\n");
|
|
goto out_no_multi_part;
|
|
}
|
|
|
|
ret = i2c_smbus_write_block_data(client,
|
|
SSIF_IPMI_MULTI_PART_REQUEST_MIDDLE,
|
|
0, msg + 64);
|
|
if (!ret)
|
|
ret = read_response(client, resp);
|
|
if (ret > 0)
|
|
/* Zero-size end parts work, use those. */
|
|
return;
|
|
|
|
/* Limit to 63 bytes and use a short middle command to mark the end. */
|
|
if (ssif_info->max_xmit_msg_size > 63)
|
|
ssif_info->max_xmit_msg_size = 63;
|
|
return;
|
|
|
|
out_no_multi_part:
|
|
ssif_info->max_xmit_msg_size = 32;
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Global enables we care about.
|
|
*/
|
|
#define GLOBAL_ENABLES_MASK (IPMI_BMC_EVT_MSG_BUFF | IPMI_BMC_RCV_MSG_INTR | \
|
|
IPMI_BMC_EVT_MSG_INTR)
|
|
|
|
static int ssif_probe(struct i2c_client *client, const struct i2c_device_id *id)
|
|
{
|
|
unsigned char msg[3];
|
|
unsigned char *resp;
|
|
struct ssif_info *ssif_info;
|
|
int rv = 0;
|
|
int len;
|
|
int i;
|
|
u8 slave_addr = 0;
|
|
struct ssif_addr_info *addr_info = NULL;
|
|
|
|
resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL);
|
|
if (!resp)
|
|
return -ENOMEM;
|
|
|
|
ssif_info = kzalloc(sizeof(*ssif_info), GFP_KERNEL);
|
|
if (!ssif_info) {
|
|
kfree(resp);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
if (!check_acpi(ssif_info, &client->dev)) {
|
|
addr_info = ssif_info_find(client->addr, client->adapter->name,
|
|
true);
|
|
if (!addr_info) {
|
|
/* Must have come in through sysfs. */
|
|
ssif_info->addr_source = SI_HOTMOD;
|
|
} else {
|
|
ssif_info->addr_source = addr_info->addr_src;
|
|
ssif_info->ssif_debug = addr_info->debug;
|
|
ssif_info->addr_info = addr_info->addr_info;
|
|
addr_info->client = client;
|
|
slave_addr = addr_info->slave_addr;
|
|
}
|
|
}
|
|
|
|
slave_addr = find_slave_address(client, slave_addr);
|
|
|
|
dev_info(&client->dev,
|
|
"Trying %s-specified SSIF interface at i2c address 0x%x, adapter %s, slave address 0x%x\n",
|
|
ipmi_addr_src_to_str(ssif_info->addr_source),
|
|
client->addr, client->adapter->name, slave_addr);
|
|
|
|
ssif_info->client = client;
|
|
i2c_set_clientdata(client, ssif_info);
|
|
|
|
/* Now check for system interface capabilities */
|
|
msg[0] = IPMI_NETFN_APP_REQUEST << 2;
|
|
msg[1] = IPMI_GET_SYSTEM_INTERFACE_CAPABILITIES_CMD;
|
|
msg[2] = 0; /* SSIF */
|
|
rv = do_cmd(client, 3, msg, &len, resp);
|
|
if (!rv && (len >= 3) && (resp[2] == 0)) {
|
|
if (len < 7) {
|
|
if (ssif_dbg_probe)
|
|
dev_dbg(&ssif_info->client->dev,
|
|
"SSIF info too short: %d\n", len);
|
|
goto no_support;
|
|
}
|
|
|
|
/* Got a good SSIF response, handle it. */
|
|
ssif_info->max_xmit_msg_size = resp[5];
|
|
ssif_info->max_recv_msg_size = resp[6];
|
|
ssif_info->multi_support = (resp[4] >> 6) & 0x3;
|
|
ssif_info->supports_pec = (resp[4] >> 3) & 0x1;
|
|
|
|
/* Sanitize the data */
|
|
switch (ssif_info->multi_support) {
|
|
case SSIF_NO_MULTI:
|
|
if (ssif_info->max_xmit_msg_size > 32)
|
|
ssif_info->max_xmit_msg_size = 32;
|
|
if (ssif_info->max_recv_msg_size > 32)
|
|
ssif_info->max_recv_msg_size = 32;
|
|
break;
|
|
|
|
case SSIF_MULTI_2_PART:
|
|
if (ssif_info->max_xmit_msg_size > 63)
|
|
ssif_info->max_xmit_msg_size = 63;
|
|
if (ssif_info->max_recv_msg_size > 62)
|
|
ssif_info->max_recv_msg_size = 62;
|
|
break;
|
|
|
|
case SSIF_MULTI_n_PART:
|
|
/* We take whatever size given, but do some testing. */
|
|
break;
|
|
|
|
default:
|
|
/* Data is not sane, just give up. */
|
|
goto no_support;
|
|
}
|
|
} else {
|
|
no_support:
|
|
/* Assume no multi-part or PEC support */
|
|
dev_info(&ssif_info->client->dev,
|
|
"Error fetching SSIF: %d %d %2.2x, your system probably doesn't support this command so using defaults\n",
|
|
rv, len, resp[2]);
|
|
|
|
ssif_info->max_xmit_msg_size = 32;
|
|
ssif_info->max_recv_msg_size = 32;
|
|
ssif_info->multi_support = SSIF_NO_MULTI;
|
|
ssif_info->supports_pec = 0;
|
|
}
|
|
|
|
test_multipart_messages(client, ssif_info, resp);
|
|
|
|
/* Make sure the NMI timeout is cleared. */
|
|
msg[0] = IPMI_NETFN_APP_REQUEST << 2;
|
|
msg[1] = IPMI_CLEAR_MSG_FLAGS_CMD;
|
|
msg[2] = WDT_PRE_TIMEOUT_INT;
|
|
rv = do_cmd(client, 3, msg, &len, resp);
|
|
if (rv || (len < 3) || (resp[2] != 0))
|
|
dev_warn(&ssif_info->client->dev,
|
|
"Unable to clear message flags: %d %d %2.2x\n",
|
|
rv, len, resp[2]);
|
|
|
|
/* Attempt to enable the event buffer. */
|
|
msg[0] = IPMI_NETFN_APP_REQUEST << 2;
|
|
msg[1] = IPMI_GET_BMC_GLOBAL_ENABLES_CMD;
|
|
rv = do_cmd(client, 2, msg, &len, resp);
|
|
if (rv || (len < 4) || (resp[2] != 0)) {
|
|
dev_warn(&ssif_info->client->dev,
|
|
"Error getting global enables: %d %d %2.2x\n",
|
|
rv, len, resp[2]);
|
|
rv = 0; /* Not fatal */
|
|
goto found;
|
|
}
|
|
|
|
ssif_info->global_enables = resp[3];
|
|
|
|
if (resp[3] & IPMI_BMC_EVT_MSG_BUFF) {
|
|
ssif_info->has_event_buffer = true;
|
|
/* buffer is already enabled, nothing to do. */
|
|
goto found;
|
|
}
|
|
|
|
msg[0] = IPMI_NETFN_APP_REQUEST << 2;
|
|
msg[1] = IPMI_SET_BMC_GLOBAL_ENABLES_CMD;
|
|
msg[2] = ssif_info->global_enables | IPMI_BMC_EVT_MSG_BUFF;
|
|
rv = do_cmd(client, 3, msg, &len, resp);
|
|
if (rv || (len < 2)) {
|
|
dev_warn(&ssif_info->client->dev,
|
|
"Error setting global enables: %d %d %2.2x\n",
|
|
rv, len, resp[2]);
|
|
rv = 0; /* Not fatal */
|
|
goto found;
|
|
}
|
|
|
|
if (resp[2] == 0) {
|
|
/* A successful return means the event buffer is supported. */
|
|
ssif_info->has_event_buffer = true;
|
|
ssif_info->global_enables |= IPMI_BMC_EVT_MSG_BUFF;
|
|
}
|
|
|
|
/* Some systems don't behave well if you enable alerts. */
|
|
if (alerts_broken)
|
|
goto found;
|
|
|
|
msg[0] = IPMI_NETFN_APP_REQUEST << 2;
|
|
msg[1] = IPMI_SET_BMC_GLOBAL_ENABLES_CMD;
|
|
msg[2] = ssif_info->global_enables | IPMI_BMC_RCV_MSG_INTR;
|
|
rv = do_cmd(client, 3, msg, &len, resp);
|
|
if (rv || (len < 2)) {
|
|
dev_warn(&ssif_info->client->dev,
|
|
"Error setting global enables: %d %d %2.2x\n",
|
|
rv, len, resp[2]);
|
|
rv = 0; /* Not fatal */
|
|
goto found;
|
|
}
|
|
|
|
if (resp[2] == 0) {
|
|
/* A successful return means the alert is supported. */
|
|
ssif_info->supports_alert = true;
|
|
ssif_info->global_enables |= IPMI_BMC_RCV_MSG_INTR;
|
|
}
|
|
|
|
found:
|
|
if (ssif_dbg_probe) {
|
|
dev_dbg(&ssif_info->client->dev,
|
|
"%s: i2c_probe found device at i2c address %x\n",
|
|
__func__, client->addr);
|
|
}
|
|
|
|
spin_lock_init(&ssif_info->lock);
|
|
ssif_info->ssif_state = SSIF_NORMAL;
|
|
timer_setup(&ssif_info->retry_timer, retry_timeout, 0);
|
|
timer_setup(&ssif_info->watch_timer, watch_timeout, 0);
|
|
|
|
for (i = 0; i < SSIF_NUM_STATS; i++)
|
|
atomic_set(&ssif_info->stats[i], 0);
|
|
|
|
if (ssif_info->supports_pec)
|
|
ssif_info->client->flags |= I2C_CLIENT_PEC;
|
|
|
|
ssif_info->handlers.owner = THIS_MODULE;
|
|
ssif_info->handlers.start_processing = ssif_start_processing;
|
|
ssif_info->handlers.shutdown = shutdown_ssif;
|
|
ssif_info->handlers.get_smi_info = get_smi_info;
|
|
ssif_info->handlers.sender = sender;
|
|
ssif_info->handlers.request_events = request_events;
|
|
ssif_info->handlers.set_need_watch = ssif_set_need_watch;
|
|
|
|
{
|
|
unsigned int thread_num;
|
|
|
|
thread_num = ((i2c_adapter_id(ssif_info->client->adapter)
|
|
<< 8) |
|
|
ssif_info->client->addr);
|
|
init_completion(&ssif_info->wake_thread);
|
|
ssif_info->thread = kthread_run(ipmi_ssif_thread, ssif_info,
|
|
"kssif%4.4x", thread_num);
|
|
if (IS_ERR(ssif_info->thread)) {
|
|
rv = PTR_ERR(ssif_info->thread);
|
|
dev_notice(&ssif_info->client->dev,
|
|
"Could not start kernel thread: error %d\n",
|
|
rv);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
dev_set_drvdata(&ssif_info->client->dev, ssif_info);
|
|
rv = device_add_group(&ssif_info->client->dev,
|
|
&ipmi_ssif_dev_attr_group);
|
|
if (rv) {
|
|
dev_err(&ssif_info->client->dev,
|
|
"Unable to add device attributes: error %d\n",
|
|
rv);
|
|
goto out;
|
|
}
|
|
|
|
rv = ipmi_register_smi(&ssif_info->handlers,
|
|
ssif_info,
|
|
&ssif_info->client->dev,
|
|
slave_addr);
|
|
if (rv) {
|
|
dev_err(&ssif_info->client->dev,
|
|
"Unable to register device: error %d\n", rv);
|
|
goto out_remove_attr;
|
|
}
|
|
|
|
out:
|
|
if (rv) {
|
|
if (addr_info)
|
|
addr_info->client = NULL;
|
|
|
|
dev_err(&ssif_info->client->dev,
|
|
"Unable to start IPMI SSIF: %d\n", rv);
|
|
kfree(ssif_info);
|
|
}
|
|
kfree(resp);
|
|
return rv;
|
|
|
|
out_remove_attr:
|
|
device_remove_group(&ssif_info->client->dev, &ipmi_ssif_dev_attr_group);
|
|
dev_set_drvdata(&ssif_info->client->dev, NULL);
|
|
goto out;
|
|
}
|
|
|
|
static int ssif_adapter_handler(struct device *adev, void *opaque)
|
|
{
|
|
struct ssif_addr_info *addr_info = opaque;
|
|
|
|
if (adev->type != &i2c_adapter_type)
|
|
return 0;
|
|
|
|
addr_info->added_client = i2c_new_device(to_i2c_adapter(adev),
|
|
&addr_info->binfo);
|
|
|
|
if (!addr_info->adapter_name)
|
|
return 1; /* Only try the first I2C adapter by default. */
|
|
return 0;
|
|
}
|
|
|
|
static int new_ssif_client(int addr, char *adapter_name,
|
|
int debug, int slave_addr,
|
|
enum ipmi_addr_src addr_src,
|
|
struct device *dev)
|
|
{
|
|
struct ssif_addr_info *addr_info;
|
|
int rv = 0;
|
|
|
|
mutex_lock(&ssif_infos_mutex);
|
|
if (ssif_info_find(addr, adapter_name, false)) {
|
|
rv = -EEXIST;
|
|
goto out_unlock;
|
|
}
|
|
|
|
addr_info = kzalloc(sizeof(*addr_info), GFP_KERNEL);
|
|
if (!addr_info) {
|
|
rv = -ENOMEM;
|
|
goto out_unlock;
|
|
}
|
|
|
|
if (adapter_name) {
|
|
addr_info->adapter_name = kstrdup(adapter_name, GFP_KERNEL);
|
|
if (!addr_info->adapter_name) {
|
|
kfree(addr_info);
|
|
rv = -ENOMEM;
|
|
goto out_unlock;
|
|
}
|
|
}
|
|
|
|
strncpy(addr_info->binfo.type, DEVICE_NAME,
|
|
sizeof(addr_info->binfo.type));
|
|
addr_info->binfo.addr = addr;
|
|
addr_info->binfo.platform_data = addr_info;
|
|
addr_info->debug = debug;
|
|
addr_info->slave_addr = slave_addr;
|
|
addr_info->addr_src = addr_src;
|
|
addr_info->dev = dev;
|
|
|
|
if (dev)
|
|
dev_set_drvdata(dev, addr_info);
|
|
|
|
list_add_tail(&addr_info->link, &ssif_infos);
|
|
|
|
if (initialized)
|
|
i2c_for_each_dev(addr_info, ssif_adapter_handler);
|
|
/* Otherwise address list will get it */
|
|
|
|
out_unlock:
|
|
mutex_unlock(&ssif_infos_mutex);
|
|
return rv;
|
|
}
|
|
|
|
static void free_ssif_clients(void)
|
|
{
|
|
struct ssif_addr_info *info, *tmp;
|
|
|
|
mutex_lock(&ssif_infos_mutex);
|
|
list_for_each_entry_safe(info, tmp, &ssif_infos, link) {
|
|
list_del(&info->link);
|
|
kfree(info->adapter_name);
|
|
kfree(info);
|
|
}
|
|
mutex_unlock(&ssif_infos_mutex);
|
|
}
|
|
|
|
static unsigned short *ssif_address_list(void)
|
|
{
|
|
struct ssif_addr_info *info;
|
|
unsigned int count = 0, i = 0;
|
|
unsigned short *address_list;
|
|
|
|
list_for_each_entry(info, &ssif_infos, link)
|
|
count++;
|
|
|
|
address_list = kcalloc(count + 1, sizeof(*address_list),
|
|
GFP_KERNEL);
|
|
if (!address_list)
|
|
return NULL;
|
|
|
|
list_for_each_entry(info, &ssif_infos, link) {
|
|
unsigned short addr = info->binfo.addr;
|
|
int j;
|
|
|
|
for (j = 0; j < i; j++) {
|
|
if (address_list[j] == addr)
|
|
/* Found a dup. */
|
|
break;
|
|
}
|
|
if (j == i) /* Didn't find it in the list. */
|
|
address_list[i++] = addr;
|
|
}
|
|
address_list[i] = I2C_CLIENT_END;
|
|
|
|
return address_list;
|
|
}
|
|
|
|
#ifdef CONFIG_ACPI
|
|
static const struct acpi_device_id ssif_acpi_match[] = {
|
|
{ "IPI0001", 0 },
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(acpi, ssif_acpi_match);
|
|
#endif
|
|
|
|
#ifdef CONFIG_DMI
|
|
static int dmi_ipmi_probe(struct platform_device *pdev)
|
|
{
|
|
u8 slave_addr = 0;
|
|
u16 i2c_addr;
|
|
int rv;
|
|
|
|
if (!ssif_trydmi)
|
|
return -ENODEV;
|
|
|
|
rv = device_property_read_u16(&pdev->dev, "i2c-addr", &i2c_addr);
|
|
if (rv) {
|
|
dev_warn(&pdev->dev, "No i2c-addr property\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
rv = device_property_read_u8(&pdev->dev, "slave-addr", &slave_addr);
|
|
if (rv)
|
|
dev_warn(&pdev->dev, "device has no slave-addr property");
|
|
|
|
return new_ssif_client(i2c_addr, NULL, 0,
|
|
slave_addr, SI_SMBIOS, &pdev->dev);
|
|
}
|
|
#else
|
|
static int dmi_ipmi_probe(struct platform_device *pdev)
|
|
{
|
|
return -ENODEV;
|
|
}
|
|
#endif
|
|
|
|
static const struct i2c_device_id ssif_id[] = {
|
|
{ DEVICE_NAME, 0 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, ssif_id);
|
|
|
|
static struct i2c_driver ssif_i2c_driver = {
|
|
.class = I2C_CLASS_HWMON,
|
|
.driver = {
|
|
.name = DEVICE_NAME
|
|
},
|
|
.probe = ssif_probe,
|
|
.remove = ssif_remove,
|
|
.alert = ssif_alert,
|
|
.id_table = ssif_id,
|
|
.detect = ssif_detect
|
|
};
|
|
|
|
static int ssif_platform_probe(struct platform_device *dev)
|
|
{
|
|
return dmi_ipmi_probe(dev);
|
|
}
|
|
|
|
static int ssif_platform_remove(struct platform_device *dev)
|
|
{
|
|
struct ssif_addr_info *addr_info = dev_get_drvdata(&dev->dev);
|
|
|
|
if (!addr_info)
|
|
return 0;
|
|
|
|
mutex_lock(&ssif_infos_mutex);
|
|
i2c_unregister_device(addr_info->added_client);
|
|
|
|
list_del(&addr_info->link);
|
|
kfree(addr_info);
|
|
mutex_unlock(&ssif_infos_mutex);
|
|
return 0;
|
|
}
|
|
|
|
static const struct platform_device_id ssif_plat_ids[] = {
|
|
{ "dmi-ipmi-ssif", 0 },
|
|
{ }
|
|
};
|
|
|
|
static struct platform_driver ipmi_driver = {
|
|
.driver = {
|
|
.name = DEVICE_NAME,
|
|
},
|
|
.probe = ssif_platform_probe,
|
|
.remove = ssif_platform_remove,
|
|
.id_table = ssif_plat_ids
|
|
};
|
|
|
|
static int init_ipmi_ssif(void)
|
|
{
|
|
int i;
|
|
int rv;
|
|
|
|
if (initialized)
|
|
return 0;
|
|
|
|
pr_info("IPMI SSIF Interface driver\n");
|
|
|
|
/* build list for i2c from addr list */
|
|
for (i = 0; i < num_addrs; i++) {
|
|
rv = new_ssif_client(addr[i], adapter_name[i],
|
|
dbg[i], slave_addrs[i],
|
|
SI_HARDCODED, NULL);
|
|
if (rv)
|
|
pr_err("Couldn't add hardcoded device at addr 0x%x\n",
|
|
addr[i]);
|
|
}
|
|
|
|
if (ssif_tryacpi)
|
|
ssif_i2c_driver.driver.acpi_match_table =
|
|
ACPI_PTR(ssif_acpi_match);
|
|
|
|
if (ssif_trydmi) {
|
|
rv = platform_driver_register(&ipmi_driver);
|
|
if (rv)
|
|
pr_err("Unable to register driver: %d\n", rv);
|
|
}
|
|
|
|
ssif_i2c_driver.address_list = ssif_address_list();
|
|
|
|
rv = i2c_add_driver(&ssif_i2c_driver);
|
|
if (!rv)
|
|
initialized = true;
|
|
|
|
return rv;
|
|
}
|
|
module_init(init_ipmi_ssif);
|
|
|
|
static void cleanup_ipmi_ssif(void)
|
|
{
|
|
if (!initialized)
|
|
return;
|
|
|
|
initialized = false;
|
|
|
|
i2c_del_driver(&ssif_i2c_driver);
|
|
|
|
kfree(ssif_i2c_driver.address_list);
|
|
|
|
platform_driver_unregister(&ipmi_driver);
|
|
|
|
free_ssif_clients();
|
|
}
|
|
module_exit(cleanup_ipmi_ssif);
|
|
|
|
MODULE_ALIAS("platform:dmi-ipmi-ssif");
|
|
MODULE_AUTHOR("Todd C Davis <todd.c.davis@intel.com>, Corey Minyard <minyard@acm.org>");
|
|
MODULE_DESCRIPTION("IPMI driver for management controllers on a SMBus");
|
|
MODULE_LICENSE("GPL");
|