linux/include/linux/ipmi_smi.h
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   1/*
   2 * ipmi_smi.h
   3 *
   4 * MontaVista IPMI system management interface
   5 *
   6 * Author: MontaVista Software, Inc.
   7 *         Corey Minyard <minyard@mvista.com>
   8 *         source@mvista.com
   9 *
  10 * Copyright 2002 MontaVista Software Inc.
  11 *
  12 *  This program is free software; you can redistribute it and/or modify it
  13 *  under the terms of the GNU General Public License as published by the
  14 *  Free Software Foundation; either version 2 of the License, or (at your
  15 *  option) any later version.
  16 *
  17 *
  18 *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  19 *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  20 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  21 *  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  22 *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
  23 *  BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
  24 *  OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  25 *  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
  26 *  TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
  27 *  USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28 *
  29 *  You should have received a copy of the GNU General Public License along
  30 *  with this program; if not, write to the Free Software Foundation, Inc.,
  31 *  675 Mass Ave, Cambridge, MA 02139, USA.
  32 */
  33
  34#ifndef __LINUX_IPMI_SMI_H
  35#define __LINUX_IPMI_SMI_H
  36
  37#include <linux/ipmi_msgdefs.h>
  38#include <linux/proc_fs.h>
  39#include <linux/platform_device.h>
  40#include <linux/ipmi.h>
  41
  42struct device;
  43
  44/* This files describes the interface for IPMI system management interface
  45   drivers to bind into the IPMI message handler. */
  46
  47/* Structure for the low-level drivers. */
  48typedef struct ipmi_smi *ipmi_smi_t;
  49
  50/*
  51 * Messages to/from the lower layer.  The smi interface will take one
  52 * of these to send. After the send has occurred and a response has
  53 * been received, it will report this same data structure back up to
  54 * the upper layer.  If an error occurs, it should fill in the
  55 * response with an error code in the completion code location. When
  56 * asynchronous data is received, one of these is allocated, the
  57 * data_size is set to zero and the response holds the data from the
  58 * get message or get event command that the interface initiated.
  59 * Note that it is the interfaces responsibility to detect
  60 * asynchronous data and messages and request them from the
  61 * interface.
  62 */
  63struct ipmi_smi_msg {
  64        struct list_head link;
  65
  66        long    msgid;
  67        void    *user_data;
  68
  69        int           data_size;
  70        unsigned char data[IPMI_MAX_MSG_LENGTH];
  71
  72        int           rsp_size;
  73        unsigned char rsp[IPMI_MAX_MSG_LENGTH];
  74
  75        /* Will be called when the system is done with the message
  76           (presumably to free it). */
  77        void (*done)(struct ipmi_smi_msg *msg);
  78};
  79
  80struct ipmi_smi_handlers {
  81        struct module *owner;
  82
  83        /* The low-level interface cannot start sending messages to
  84           the upper layer until this function is called.  This may
  85           not be NULL, the lower layer must take the interface from
  86           this call. */
  87        int (*start_processing)(void       *send_info,
  88                                ipmi_smi_t new_intf);
  89
  90        /*
  91         * Get the detailed private info of the low level interface and store
  92         * it into the structure of ipmi_smi_data. For example: the
  93         * ACPI device handle will be returned for the pnp_acpi IPMI device.
  94         */
  95        int (*get_smi_info)(void *send_info, struct ipmi_smi_info *data);
  96
  97        /* Called to enqueue an SMI message to be sent.  This
  98           operation is not allowed to fail.  If an error occurs, it
  99           should report back the error in a received message.  It may
 100           do this in the current call context, since no write locks
 101           are held when this is run.  If the priority is > 0, the
 102           message will go into a high-priority queue and be sent
 103           first.  Otherwise, it goes into a normal-priority queue. */
 104        void (*sender)(void                *send_info,
 105                       struct ipmi_smi_msg *msg,
 106                       int                 priority);
 107
 108        /* Called by the upper layer to request that we try to get
 109           events from the BMC we are attached to. */
 110        void (*request_events)(void *send_info);
 111
 112        /* Called when the interface should go into "run to
 113           completion" mode.  If this call sets the value to true, the
 114           interface should make sure that all messages are flushed
 115           out and that none are pending, and any new requests are run
 116           to completion immediately. */
 117        void (*set_run_to_completion)(void *send_info, int run_to_completion);
 118
 119        /* Called to poll for work to do.  This is so upper layers can
 120           poll for operations during things like crash dumps. */
 121        void (*poll)(void *send_info);
 122
 123        /* Enable/disable firmware maintenance mode.  Note that this
 124           is *not* the modes defined, this is simply an on/off
 125           setting.  The message handler does the mode handling.  Note
 126           that this is called from interrupt context, so it cannot
 127           block. */
 128        void (*set_maintenance_mode)(void *send_info, int enable);
 129
 130        /* Tell the handler that we are using it/not using it.  The
 131           message handler get the modules that this handler belongs
 132           to; this function lets the SMI claim any modules that it
 133           uses.  These may be NULL if this is not required. */
 134        int (*inc_usecount)(void *send_info);
 135        void (*dec_usecount)(void *send_info);
 136};
 137
 138struct ipmi_device_id {
 139        unsigned char device_id;
 140        unsigned char device_revision;
 141        unsigned char firmware_revision_1;
 142        unsigned char firmware_revision_2;
 143        unsigned char ipmi_version;
 144        unsigned char additional_device_support;
 145        unsigned int  manufacturer_id;
 146        unsigned int  product_id;
 147        unsigned char aux_firmware_revision[4];
 148        unsigned int  aux_firmware_revision_set : 1;
 149};
 150
 151#define ipmi_version_major(v) ((v)->ipmi_version & 0xf)
 152#define ipmi_version_minor(v) ((v)->ipmi_version >> 4)
 153
 154/* Take a pointer to a raw data buffer and a length and extract device
 155   id information from it.  The first byte of data must point to the
 156   netfn << 2, the data should be of the format:
 157      netfn << 2, cmd, completion code, data
 158   as normally comes from a device interface. */
 159static inline int ipmi_demangle_device_id(const unsigned char *data,
 160                                          unsigned int data_len,
 161                                          struct ipmi_device_id *id)
 162{
 163        if (data_len < 9)
 164                return -EINVAL;
 165        if (data[0] != IPMI_NETFN_APP_RESPONSE << 2 ||
 166            data[1] != IPMI_GET_DEVICE_ID_CMD)
 167                /* Strange, didn't get the response we expected. */
 168                return -EINVAL;
 169        if (data[2] != 0)
 170                /* That's odd, it shouldn't be able to fail. */
 171                return -EINVAL;
 172
 173        data += 3;
 174        data_len -= 3;
 175        id->device_id = data[0];
 176        id->device_revision = data[1];
 177        id->firmware_revision_1 = data[2];
 178        id->firmware_revision_2 = data[3];
 179        id->ipmi_version = data[4];
 180        id->additional_device_support = data[5];
 181        if (data_len >= 11) {
 182                id->manufacturer_id = (data[6] | (data[7] << 8) |
 183                                       (data[8] << 16));
 184                id->product_id = data[9] | (data[10] << 8);
 185        } else {
 186                id->manufacturer_id = 0;
 187                id->product_id = 0;
 188        }
 189        if (data_len >= 15) {
 190                memcpy(id->aux_firmware_revision, data+11, 4);
 191                id->aux_firmware_revision_set = 1;
 192        } else
 193                id->aux_firmware_revision_set = 0;
 194
 195        return 0;
 196}
 197
 198/* Add a low-level interface to the IPMI driver.  Note that if the
 199   interface doesn't know its slave address, it should pass in zero.
 200   The low-level interface should not deliver any messages to the
 201   upper layer until the start_processing() function in the handlers
 202   is called, and the lower layer must get the interface from that
 203   call. */
 204int ipmi_register_smi(struct ipmi_smi_handlers *handlers,
 205                      void                     *send_info,
 206                      struct ipmi_device_id    *device_id,
 207                      struct device            *dev,
 208                      const char               *sysfs_name,
 209                      unsigned char            slave_addr);
 210
 211/*
 212 * Remove a low-level interface from the IPMI driver.  This will
 213 * return an error if the interface is still in use by a user.
 214 */
 215int ipmi_unregister_smi(ipmi_smi_t intf);
 216
 217/*
 218 * The lower layer reports received messages through this interface.
 219 * The data_size should be zero if this is an asynchronous message.  If
 220 * the lower layer gets an error sending a message, it should format
 221 * an error response in the message response.
 222 */
 223void ipmi_smi_msg_received(ipmi_smi_t          intf,
 224                           struct ipmi_smi_msg *msg);
 225
 226/* The lower layer received a watchdog pre-timeout on interface. */
 227void ipmi_smi_watchdog_pretimeout(ipmi_smi_t intf);
 228
 229struct ipmi_smi_msg *ipmi_alloc_smi_msg(void);
 230static inline void ipmi_free_smi_msg(struct ipmi_smi_msg *msg)
 231{
 232        msg->done(msg);
 233}
 234
 235/* Allow the lower layer to add things to the proc filesystem
 236   directory for this interface.  Note that the entry will
 237   automatically be dstroyed when the interface is destroyed. */
 238int ipmi_smi_add_proc_entry(ipmi_smi_t smi, char *name,
 239                            const struct file_operations *proc_ops,
 240                            void *data);
 241
 242#endif /* __LINUX_IPMI_SMI_H */
 243
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