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/module.h>
40 #include <linux/device.h>
41 #include <linux/platform_device.h>
42 #include <linux/ipmi.h>
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. */
48 typedef 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 */
63 struct 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
80 struct 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
138 struct 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. */
ipmi_demangle_device_id(const unsigned char * data,unsigned int data_len,struct ipmi_device_id * id)159 static 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. */
204 int 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 */
215 int 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 asyncronous message. If
220 * the lower layer gets an error sending a message, it should format
221 * an error response in the message response.
222 */
223 void 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. */
227 void ipmi_smi_watchdog_pretimeout(ipmi_smi_t intf);
228
229 struct ipmi_smi_msg *ipmi_alloc_smi_msg(void);
ipmi_free_smi_msg(struct ipmi_smi_msg * msg)230 static 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. */
238 int ipmi_smi_add_proc_entry(ipmi_smi_t smi, char *name,
239 read_proc_t *read_proc,
240 void *data);
241
242 #endif /* __LINUX_IPMI_SMI_H */
243