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path: root/drivers/char/ipmi/ipmi_ssif.c
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Diffstat (limited to 'drivers/char/ipmi/ipmi_ssif.c')
-rw-r--r--drivers/char/ipmi/ipmi_ssif.c2168
1 files changed, 2168 insertions, 0 deletions
diff --git a/drivers/char/ipmi/ipmi_ssif.c b/drivers/char/ipmi/ipmi_ssif.c
new file mode 100644
index 000000000..248459f97
--- /dev/null
+++ b/drivers/char/ipmi/ipmi_ssif.c
@@ -0,0 +1,2168 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * ipmi_ssif.c
+ *
+ * The interface to the IPMI driver for SMBus access to a SMBus
+ * compliant device. Called SSIF by the IPMI spec.
+ *
+ * Author: Intel Corporation
+ * Todd Davis <todd.c.davis@intel.com>
+ *
+ * Rewritten by Corey Minyard <minyard@acm.org> to support the
+ * non-blocking I2C interface, add support for multi-part
+ * transactions, add PEC support, and general clenaup.
+ *
+ * Copyright 2003 Intel Corporation
+ * Copyright 2005 MontaVista Software
+ */
+
+/*
+ * This file holds the "policy" for the interface to the SSIF state
+ * machine. It does the configuration, handles timers and interrupts,
+ * and drives the real SSIF state machine.
+ */
+
+#define pr_fmt(fmt) "ipmi_ssif: " fmt
+#define dev_fmt(fmt) "ipmi_ssif: " fmt
+
+#if defined(MODVERSIONS)
+#include <linux/modversions.h>
+#endif
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/sched.h>
+#include <linux/seq_file.h>
+#include <linux/timer.h>
+#include <linux/delay.h>
+#include <linux/errno.h>
+#include <linux/spinlock.h>
+#include <linux/slab.h>
+#include <linux/list.h>
+#include <linux/i2c.h>
+#include <linux/ipmi_smi.h>
+#include <linux/init.h>
+#include <linux/dmi.h>
+#include <linux/kthread.h>
+#include <linux/acpi.h>
+#include <linux/ctype.h>
+#include <linux/time64.h>
+#include "ipmi_dmi.h"
+
+#define DEVICE_NAME "ipmi_ssif"
+
+#define IPMI_GET_SYSTEM_INTERFACE_CAPABILITIES_CMD 0x57
+
+#define SSIF_IPMI_REQUEST 2
+#define SSIF_IPMI_MULTI_PART_REQUEST_START 6
+#define SSIF_IPMI_MULTI_PART_REQUEST_MIDDLE 7
+#define SSIF_IPMI_MULTI_PART_REQUEST_END 8
+#define SSIF_IPMI_RESPONSE 3
+#define SSIF_IPMI_MULTI_PART_RESPONSE_MIDDLE 9
+
+/* ssif_debug is a bit-field
+ * SSIF_DEBUG_MSG - commands and their responses
+ * SSIF_DEBUG_STATES - message states
+ * SSIF_DEBUG_TIMING - Measure times between events in the driver
+ */
+#define SSIF_DEBUG_TIMING 4
+#define SSIF_DEBUG_STATE 2
+#define SSIF_DEBUG_MSG 1
+#define SSIF_NODEBUG 0
+#define SSIF_DEFAULT_DEBUG (SSIF_NODEBUG)
+
+/*
+ * Timer values
+ */
+#define SSIF_MSG_USEC 60000 /* 60ms between message tries (T3). */
+#define SSIF_REQ_RETRY_USEC 60000 /* 60ms between send retries (T6). */
+#define SSIF_MSG_PART_USEC 5000 /* 5ms for a message part */
+
+/* How many times to we retry sending/receiving the message. */
+#define SSIF_SEND_RETRIES 5
+#define SSIF_RECV_RETRIES 250
+
+#define SSIF_MSG_MSEC (SSIF_MSG_USEC / 1000)
+#define SSIF_REQ_RETRY_MSEC (SSIF_REQ_RETRY_USEC / 1000)
+#define SSIF_MSG_JIFFIES ((SSIF_MSG_USEC * 1000) / TICK_NSEC)
+#define SSIF_REQ_RETRY_JIFFIES ((SSIF_REQ_RETRY_USEC * 1000) / TICK_NSEC)
+#define SSIF_MSG_PART_JIFFIES ((SSIF_MSG_PART_USEC * 1000) / TICK_NSEC)
+
+/*
+ * Timeout for the watch, only used for get flag timer.
+ */
+#define SSIF_WATCH_MSG_TIMEOUT msecs_to_jiffies(10)
+#define SSIF_WATCH_WATCHDOG_TIMEOUT msecs_to_jiffies(250)
+
+enum ssif_intf_state {
+ SSIF_IDLE,
+ SSIF_GETTING_FLAGS,
+ SSIF_GETTING_EVENTS,
+ SSIF_CLEARING_FLAGS,
+ SSIF_GETTING_MESSAGES,
+ /* FIXME - add watchdog stuff. */
+};
+
+#define IS_SSIF_IDLE(ssif) ((ssif)->ssif_state == SSIF_IDLE \
+ && (ssif)->curr_msg == NULL)
+
+/*
+ * Indexes into stats[] in ssif_info below.
+ */
+enum ssif_stat_indexes {
+ /* Number of total messages sent. */
+ SSIF_STAT_sent_messages = 0,
+
+ /*
+ * Number of message parts sent. Messages may be broken into
+ * parts if they are long.
+ */
+ SSIF_STAT_sent_messages_parts,
+
+ /*
+ * Number of time a message was retried.
+ */
+ SSIF_STAT_send_retries,
+
+ /*
+ * Number of times the send of a message failed.
+ */
+ SSIF_STAT_send_errors,
+
+ /*
+ * Number of message responses received.
+ */
+ SSIF_STAT_received_messages,
+
+ /*
+ * Number of message fragments received.
+ */
+ SSIF_STAT_received_message_parts,
+
+ /*
+ * Number of times the receive of a message was retried.
+ */
+ SSIF_STAT_receive_retries,
+
+ /*
+ * Number of errors receiving messages.
+ */
+ SSIF_STAT_receive_errors,
+
+ /*
+ * Number of times a flag fetch was requested.
+ */
+ SSIF_STAT_flag_fetches,
+
+ /*
+ * Number of times the hardware didn't follow the state machine.
+ */
+ SSIF_STAT_hosed,
+
+ /*
+ * Number of received events.
+ */
+ SSIF_STAT_events,
+
+ /* Number of asyncronous messages received. */
+ SSIF_STAT_incoming_messages,
+
+ /* Number of watchdog pretimeouts. */
+ SSIF_STAT_watchdog_pretimeouts,
+
+ /* Number of alers received. */
+ SSIF_STAT_alerts,
+
+ /* Always add statistics before this value, it must be last. */
+ SSIF_NUM_STATS
+};
+
+struct ssif_addr_info {
+ struct i2c_board_info binfo;
+ char *adapter_name;
+ int debug;
+ int slave_addr;
+ enum ipmi_addr_src addr_src;
+ union ipmi_smi_info_union addr_info;
+ struct device *dev;
+ struct i2c_client *client;
+
+ struct mutex clients_mutex;
+ struct list_head clients;
+
+ struct list_head link;
+};
+
+struct ssif_info;
+
+typedef void (*ssif_i2c_done)(struct ssif_info *ssif_info, int result,
+ unsigned char *data, unsigned int len);
+
+struct ssif_info {
+ struct ipmi_smi *intf;
+ spinlock_t lock;
+ struct ipmi_smi_msg *waiting_msg;
+ struct ipmi_smi_msg *curr_msg;
+ enum ssif_intf_state ssif_state;
+ unsigned long ssif_debug;
+
+ struct ipmi_smi_handlers handlers;
+
+ enum ipmi_addr_src addr_source; /* ACPI, PCI, SMBIOS, hardcode, etc. */
+ union ipmi_smi_info_union addr_info;
+
+ /*
+ * Flags from the last GET_MSG_FLAGS command, used when an ATTN
+ * is set to hold the flags until we are done handling everything
+ * from the flags.
+ */
+#define RECEIVE_MSG_AVAIL 0x01
+#define EVENT_MSG_BUFFER_FULL 0x02
+#define WDT_PRE_TIMEOUT_INT 0x08
+ unsigned char msg_flags;
+
+ u8 global_enables;
+ bool has_event_buffer;
+ bool supports_alert;
+
+ /*
+ * Used to tell what we should do with alerts. If we are
+ * waiting on a response, read the data immediately.
+ */
+ bool got_alert;
+ bool waiting_alert;
+
+ /* Used to inform the timeout that it should do a resend. */
+ bool do_resend;
+
+ /*
+ * If set to true, this will request events the next time the
+ * state machine is idle.
+ */
+ bool req_events;
+
+ /*
+ * If set to true, this will request flags the next time the
+ * state machine is idle.
+ */
+ bool req_flags;
+
+ /* Used for sending/receiving data. +1 for the length. */
+ unsigned char data[IPMI_MAX_MSG_LENGTH + 1];
+ unsigned int data_len;
+
+ /* Temp receive buffer, gets copied into data. */
+ unsigned char recv[I2C_SMBUS_BLOCK_MAX];
+
+ struct i2c_client *client;
+ ssif_i2c_done done_handler;
+
+ /* Thread interface handling */
+ struct task_struct *thread;
+ struct completion wake_thread;
+ bool stopping;
+ int i2c_read_write;
+ int i2c_command;
+ unsigned char *i2c_data;
+ unsigned int i2c_size;
+
+ struct timer_list retry_timer;
+ int retries_left;
+
+ long watch_timeout; /* Timeout for flags check, 0 if off. */
+ struct timer_list watch_timer; /* Flag fetch timer. */
+
+ /* Info from SSIF cmd */
+ unsigned char max_xmit_msg_size;
+ unsigned char max_recv_msg_size;
+ bool cmd8_works; /* See test_multipart_messages() for details. */
+ unsigned int multi_support;
+ int supports_pec;
+
+#define SSIF_NO_MULTI 0
+#define SSIF_MULTI_2_PART 1
+#define SSIF_MULTI_n_PART 2
+ unsigned char *multi_data;
+ unsigned int multi_len;
+ unsigned int multi_pos;
+
+ atomic_t stats[SSIF_NUM_STATS];
+};
+
+#define ssif_inc_stat(ssif, stat) \
+ atomic_inc(&(ssif)->stats[SSIF_STAT_ ## stat])
+#define ssif_get_stat(ssif, stat) \
+ ((unsigned int) atomic_read(&(ssif)->stats[SSIF_STAT_ ## stat]))
+
+static bool initialized;
+static bool platform_registered;
+
+static void return_hosed_msg(struct ssif_info *ssif_info,
+ struct ipmi_smi_msg *msg);
+static void start_next_msg(struct ssif_info *ssif_info, unsigned long *flags);
+static int start_send(struct ssif_info *ssif_info,
+ unsigned char *data,
+ unsigned int len);
+
+static unsigned long *ipmi_ssif_lock_cond(struct ssif_info *ssif_info,
+ unsigned long *flags)
+ __acquires(&ssif_info->lock)
+{
+ spin_lock_irqsave(&ssif_info->lock, *flags);
+ return flags;
+}
+
+static void ipmi_ssif_unlock_cond(struct ssif_info *ssif_info,
+ unsigned long *flags)
+ __releases(&ssif_info->lock)
+{
+ spin_unlock_irqrestore(&ssif_info->lock, *flags);
+}
+
+static void deliver_recv_msg(struct ssif_info *ssif_info,
+ struct ipmi_smi_msg *msg)
+{
+ if (msg->rsp_size < 0) {
+ return_hosed_msg(ssif_info, msg);
+ dev_err(&ssif_info->client->dev,
+ "%s: Malformed message: rsp_size = %d\n",
+ __func__, msg->rsp_size);
+ } else {
+ ipmi_smi_msg_received(ssif_info->intf, msg);
+ }
+}
+
+static void return_hosed_msg(struct ssif_info *ssif_info,
+ struct ipmi_smi_msg *msg)
+{
+ ssif_inc_stat(ssif_info, hosed);
+
+ /* Make it a response */
+ msg->rsp[0] = msg->data[0] | 4;
+ msg->rsp[1] = msg->data[1];
+ msg->rsp[2] = 0xFF; /* Unknown error. */
+ msg->rsp_size = 3;
+
+ deliver_recv_msg(ssif_info, msg);
+}
+
+/*
+ * Must be called with the message lock held. This will release the
+ * message lock. Note that the caller will check IS_SSIF_IDLE and
+ * start a new operation, so there is no need to check for new
+ * messages to start in here.
+ */
+static void start_clear_flags(struct ssif_info *ssif_info, unsigned long *flags)
+{
+ unsigned char msg[3];
+
+ ssif_info->msg_flags &= ~WDT_PRE_TIMEOUT_INT;
+ ssif_info->ssif_state = SSIF_CLEARING_FLAGS;
+ ipmi_ssif_unlock_cond(ssif_info, flags);
+
+ /* Make sure the watchdog pre-timeout flag is not set at startup. */
+ msg[0] = (IPMI_NETFN_APP_REQUEST << 2);
+ msg[1] = IPMI_CLEAR_MSG_FLAGS_CMD;
+ msg[2] = WDT_PRE_TIMEOUT_INT;
+
+ if (start_send(ssif_info, msg, 3) != 0) {
+ /* Error, just go to normal state. */
+ ssif_info->ssif_state = SSIF_IDLE;
+ }
+}
+
+static void start_flag_fetch(struct ssif_info *ssif_info, unsigned long *flags)
+{
+ unsigned char mb[2];
+
+ ssif_info->req_flags = false;
+ ssif_info->ssif_state = SSIF_GETTING_FLAGS;
+ ipmi_ssif_unlock_cond(ssif_info, flags);
+
+ mb[0] = (IPMI_NETFN_APP_REQUEST << 2);
+ mb[1] = IPMI_GET_MSG_FLAGS_CMD;
+ if (start_send(ssif_info, mb, 2) != 0)
+ ssif_info->ssif_state = SSIF_IDLE;
+}
+
+static void check_start_send(struct ssif_info *ssif_info, unsigned long *flags,
+ struct ipmi_smi_msg *msg)
+{
+ if (start_send(ssif_info, msg->data, msg->data_size) != 0) {
+ unsigned long oflags;
+
+ flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
+ ssif_info->curr_msg = NULL;
+ ssif_info->ssif_state = SSIF_IDLE;
+ ipmi_ssif_unlock_cond(ssif_info, flags);
+ ipmi_free_smi_msg(msg);
+ }
+}
+
+static void start_event_fetch(struct ssif_info *ssif_info, unsigned long *flags)
+{
+ struct ipmi_smi_msg *msg;
+
+ ssif_info->req_events = false;
+
+ msg = ipmi_alloc_smi_msg();
+ if (!msg) {
+ ssif_info->ssif_state = SSIF_IDLE;
+ ipmi_ssif_unlock_cond(ssif_info, flags);
+ return;
+ }
+
+ ssif_info->curr_msg = msg;
+ ssif_info->ssif_state = SSIF_GETTING_EVENTS;
+ ipmi_ssif_unlock_cond(ssif_info, flags);
+
+ msg->data[0] = (IPMI_NETFN_APP_REQUEST << 2);
+ msg->data[1] = IPMI_READ_EVENT_MSG_BUFFER_CMD;
+ msg->data_size = 2;
+
+ check_start_send(ssif_info, flags, msg);
+}
+
+static void start_recv_msg_fetch(struct ssif_info *ssif_info,
+ unsigned long *flags)
+{
+ struct ipmi_smi_msg *msg;
+
+ msg = ipmi_alloc_smi_msg();
+ if (!msg) {
+ ssif_info->ssif_state = SSIF_IDLE;
+ ipmi_ssif_unlock_cond(ssif_info, flags);
+ return;
+ }
+
+ ssif_info->curr_msg = msg;
+ ssif_info->ssif_state = SSIF_GETTING_MESSAGES;
+ ipmi_ssif_unlock_cond(ssif_info, flags);
+
+ msg->data[0] = (IPMI_NETFN_APP_REQUEST << 2);
+ msg->data[1] = IPMI_GET_MSG_CMD;
+ msg->data_size = 2;
+
+ check_start_send(ssif_info, flags, msg);
+}
+
+/*
+ * Must be called with the message lock held. This will release the
+ * message lock. Note that the caller will check IS_SSIF_IDLE and
+ * start a new operation, so there is no need to check for new
+ * messages to start in here.
+ */
+static void handle_flags(struct ssif_info *ssif_info, unsigned long *flags)
+{
+ if (ssif_info->msg_flags & WDT_PRE_TIMEOUT_INT) {
+ /* Watchdog pre-timeout */
+ ssif_inc_stat(ssif_info, watchdog_pretimeouts);
+ start_clear_flags(ssif_info, flags);
+ ipmi_smi_watchdog_pretimeout(ssif_info->intf);
+ } else if (ssif_info->msg_flags & RECEIVE_MSG_AVAIL)
+ /* Messages available. */
+ start_recv_msg_fetch(ssif_info, flags);
+ else if (ssif_info->msg_flags & EVENT_MSG_BUFFER_FULL)
+ /* Events available. */
+ start_event_fetch(ssif_info, flags);
+ else {
+ ssif_info->ssif_state = SSIF_IDLE;
+ ipmi_ssif_unlock_cond(ssif_info, flags);
+ }
+}
+
+static int ipmi_ssif_thread(void *data)
+{
+ struct ssif_info *ssif_info = data;
+
+ while (!kthread_should_stop()) {
+ int result;
+
+ /* Wait for something to do */
+ result = wait_for_completion_interruptible(
+ &ssif_info->wake_thread);
+ if (ssif_info->stopping)
+ break;
+ if (result == -ERESTARTSYS)
+ continue;
+ init_completion(&ssif_info->wake_thread);
+
+ if (ssif_info->i2c_read_write == I2C_SMBUS_WRITE) {
+ result = i2c_smbus_write_block_data(
+ ssif_info->client, ssif_info->i2c_command,
+ ssif_info->i2c_data[0],
+ ssif_info->i2c_data + 1);
+ ssif_info->done_handler(ssif_info, result, NULL, 0);
+ } else {
+ result = i2c_smbus_read_block_data(
+ ssif_info->client, ssif_info->i2c_command,
+ ssif_info->i2c_data);
+ if (result < 0)
+ ssif_info->done_handler(ssif_info, result,
+ NULL, 0);
+ else
+ ssif_info->done_handler(ssif_info, 0,
+ ssif_info->i2c_data,
+ result);
+ }
+ }
+
+ return 0;
+}
+
+static void 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);
+}
+
+
+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)
+{
+ ssif_info->multi_pos = 0;
+
+ ssif_i2c_send(ssif_info, msg_done_handler, I2C_SMBUS_READ,
+ SSIF_IPMI_RESPONSE,
+ ssif_info->recv, I2C_SMBUS_BLOCK_DATA);
+}
+
+static void start_resend(struct ssif_info *ssif_info);
+
+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, resend;
+
+ if (ssif_info->stopping)
+ return;
+
+ flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
+ resend = ssif_info->do_resend;
+ ssif_info->do_resend = false;
+ waiting = ssif_info->waiting_alert;
+ ssif_info->waiting_alert = false;
+ ipmi_ssif_unlock_cond(ssif_info, flags);
+
+ if (waiting)
+ start_get(ssif_info);
+ if (resend) {
+ start_resend(ssif_info);
+ ssif_inc_stat(ssif_info, send_retries);
+ }
+}
+
+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 (IS_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 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;
+
+ /*
+ * 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;
+ 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;
+
+ ssif_i2c_send(ssif_info, msg_done_handler, I2C_SMBUS_READ,
+ SSIF_IPMI_MULTI_PART_RESPONSE_MIDDLE,
+ ssif_info->recv, I2C_SMBUS_BLOCK_DATA);
+ 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 + 1 != 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.
+ */
+ if (ssif_info->ssif_debug & SSIF_DEBUG_MSG)
+ dev_dbg(&ssif_info->client->dev,
+ "Received message out of sequence, expected %u, got %u\n",
+ ssif_info->multi_pos - 1, blocknum);
+ result = -EIO;
+ } else {
+ ssif_inc_stat(ssif_info, received_message_parts);
+
+ ssif_info->multi_pos++;
+
+ ssif_i2c_send(ssif_info, msg_done_handler,
+ I2C_SMBUS_READ,
+ SSIF_IPMI_MULTI_PART_RESPONSE_MIDDLE,
+ ssif_info->recv,
+ I2C_SMBUS_BLOCK_DATA);
+ 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) {
+ if (data) {
+ if (len > IPMI_MAX_MSG_LENGTH)
+ len = IPMI_MAX_MSG_LENGTH;
+ memcpy(msg->rsp, data, len);
+ } else {
+ len = 0;
+ }
+ msg->rsp_size = len;
+ ssif_info->curr_msg = NULL;
+ }
+
+ switch (ssif_info->ssif_state) {
+ case SSIF_IDLE:
+ 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_IDLE;
+ 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) {
+ /*
+ * Recv error response, give up.
+ */
+ ssif_info->ssif_state = SSIF_IDLE;
+ 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_IDLE;
+ ipmi_ssif_unlock_cond(ssif_info, flags);
+ break;
+
+ case SSIF_GETTING_EVENTS:
+ if (!msg) {
+ /* Should never happen, but just in case. */
+ dev_warn(&ssif_info->client->dev,
+ "No message set while getting events\n");
+ ipmi_ssif_unlock_cond(ssif_info, flags);
+ break;
+ }
+
+ 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 (!msg) {
+ /* Should never happen, but just in case. */
+ dev_warn(&ssif_info->client->dev,
+ "No message set while getting messages\n");
+ ipmi_ssif_unlock_cond(ssif_info, flags);
+ break;
+ }
+
+ 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;
+
+ default:
+ /* Should never happen, but just in case. */
+ dev_warn(&ssif_info->client->dev,
+ "Invalid state in message done handling: %d\n",
+ ssif_info->ssif_state);
+ ipmi_ssif_unlock_cond(ssif_info, flags);
+ }
+
+ flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
+ if (IS_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)
+{
+ /* We are single-threaded here, so no need for a lock. */
+ if (result < 0) {
+ ssif_info->retries_left--;
+ if (ssif_info->retries_left > 0) {
+ /*
+ * Wait the retry timeout time per the spec,
+ * then redo the send.
+ */
+ ssif_info->do_resend = true;
+ mod_timer(&ssif_info->retry_timer,
+ jiffies + SSIF_REQ_RETRY_JIFFIES);
+ return;
+ }
+
+ 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;
+ }
+
+ 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;
+ }
+
+ ssif_i2c_send(ssif_info, msg_written_handler,
+ I2C_SMBUS_WRITE, cmd,
+ data_to_send, I2C_SMBUS_BLOCK_DATA);
+ } 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;
+ if (!ssif_info->stopping)
+ mod_timer(&ssif_info->retry_timer,
+ jiffies + SSIF_MSG_PART_JIFFIES);
+ ipmi_ssif_unlock_cond(ssif_info, flags);
+ }
+ }
+}
+
+static void start_resend(struct ssif_info *ssif_info)
+{
+ 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;
+ }
+
+ ssif_i2c_send(ssif_info, msg_written_handler, I2C_SMBUS_WRITE,
+ command, ssif_info->data, I2C_SMBUS_BLOCK_DATA);
+}
+
+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;
+ start_resend(ssif_info);
+ return 0;
+}
+
+/* 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 (!IS_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 = 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 = 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 = 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 sysfs_emit(buf, "%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 sysfs_emit(buf, "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_IDLE)
+ 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 void 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;
+
+ /*
+ * 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);
+}
+
+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) {
+ msleep(SSIF_REQ_RETRY_MSEC);
+ 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
+ strscpy(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->addr_src == SI_SMBIOS && !info->adapter_name)
+ info->adapter_name = kstrdup(adapter_name,
+ GFP_KERNEL);
+
+ 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;
+ request_module("acpi_ipmi");
+ 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) {
+ msleep(SSIF_REQ_RETRY_MSEC);
+ 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 void ssif_remove_dup(struct i2c_client *client)
+{
+ struct ssif_info *ssif_info = i2c_get_clientdata(client);
+
+ ipmi_unregister_smi(ssif_info->intf);
+ kfree(ssif_info);
+}
+
+static int ssif_add_infos(struct i2c_client *client)
+{
+ struct ssif_addr_info *info;
+
+ info = kzalloc(sizeof(*info), GFP_KERNEL);
+ if (!info)
+ return -ENOMEM;
+ info->addr_src = SI_ACPI;
+ info->client = client;
+ info->adapter_name = kstrdup(client->adapter->name, GFP_KERNEL);
+ if (!info->adapter_name) {
+ kfree(info);
+ return -ENOMEM;
+ }
+
+ info->binfo.addr = client->addr;
+ list_add_tail(&info->link, &ssif_infos);
+ return 0;
+}
+
+/*
+ * Prefer ACPI over SMBIOS, if both are available.
+ * So if we get an ACPI interface and have already registered a SMBIOS
+ * interface at the same address, remove the SMBIOS and add the ACPI one.
+ */
+static int ssif_check_and_remove(struct i2c_client *client,
+ struct ssif_info *ssif_info)
+{
+ struct ssif_addr_info *info;
+
+ list_for_each_entry(info, &ssif_infos, link) {
+ if (!info->client)
+ return 0;
+ if (!strcmp(info->adapter_name, client->adapter->name) &&
+ info->binfo.addr == client->addr) {
+ if (info->addr_src == SI_ACPI)
+ return -EEXIST;
+
+ if (ssif_info->addr_source == SI_ACPI &&
+ info->addr_src == SI_SMBIOS) {
+ dev_info(&client->dev,
+ "Removing %s-specified SSIF interface in favor of ACPI\n",
+ ipmi_addr_src_to_str(info->addr_src));
+ ssif_remove_dup(info->client);
+ return 0;
+ }
+ }
+ }
+ return 0;
+}
+
+static int ssif_probe(struct i2c_client *client)
+{
+ unsigned char msg[3];
+ unsigned char *resp;
+ struct ssif_info *ssif_info;
+ int rv = 0;
+ int len = 0;
+ int i;
+ u8 slave_addr = 0;
+ struct ssif_addr_info *addr_info = NULL;
+
+ mutex_lock(&ssif_infos_mutex);
+ resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL);
+ if (!resp) {
+ mutex_unlock(&ssif_infos_mutex);
+ return -ENOMEM;
+ }
+
+ ssif_info = kzalloc(sizeof(*ssif_info), GFP_KERNEL);
+ if (!ssif_info) {
+ kfree(resp);
+ mutex_unlock(&ssif_infos_mutex);
+ 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;
+ }
+ }
+
+ ssif_info->client = client;
+ i2c_set_clientdata(client, ssif_info);
+
+ rv = ssif_check_and_remove(client, ssif_info);
+ /* If rv is 0 and addr source is not SI_ACPI, continue probing */
+ if (!rv && ssif_info->addr_source == SI_ACPI) {
+ rv = ssif_add_infos(client);
+ if (rv) {
+ dev_err(&client->dev, "Out of memory!, exiting ..\n");
+ goto out;
+ }
+ } else if (rv) {
+ dev_err(&client->dev, "Not probing, Interface already present\n");
+ goto out;
+ }
+
+ 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);
+
+ /* 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_IDLE;
+ 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);
+ i2c_set_clientdata(client, NULL);
+ kfree(ssif_info);
+ }
+ kfree(resp);
+ mutex_unlock(&ssif_infos_mutex);
+ 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 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);
+
+ /* 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)
+ slave_addr = 0x20;
+
+ 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_new = 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);
+ 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 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);
+ else
+ platform_registered = true;
+ }
+
+ 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 __exit cleanup_ipmi_ssif(void)
+{
+ if (!initialized)
+ return;
+
+ initialized = false;
+
+ i2c_del_driver(&ssif_i2c_driver);
+
+ kfree(ssif_i2c_driver.address_list);
+
+ if (ssif_trydmi && platform_registered)
+ 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");