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/device.h>
40 #include <linux/platform_device.h>
41 #include <linux/ipmi.h>
42
43 /* This files describes the interface for IPMI system management interface
44 drivers to bind into the IPMI message handler. */
45
46 /* Structure for the low-level drivers. */
47 typedef struct ipmi_smi *ipmi_smi_t;
48
49 /*
50 * Messages to/from the lower layer. The smi interface will take one
51 * of these to send. After the send has occurred and a response has
52 * been received, it will report this same data structure back up to
53 * the upper layer. If an error occurs, it should fill in the
54 * response with an error code in the completion code location. When
55 * asynchronous data is received, one of these is allocated, the
56 * data_size is set to zero and the response holds the data from the
57 * get message or get event command that the interface initiated.
58 * Note that it is the interfaces responsibility to detect
59 * asynchronous data and messages and request them from the
60 * interface.
61 */
62 struct ipmi_smi_msg {
63 struct list_head link;
64
65 long msgid;
66 void *user_data;
67
68 int data_size;
69 unsigned char data[IPMI_MAX_MSG_LENGTH];
70
71 int rsp_size;
72 unsigned char rsp[IPMI_MAX_MSG_LENGTH];
73
74 /* Will be called when the system is done with the message
75 (presumably to free it). */
76 void (*done)(struct ipmi_smi_msg *msg);
77 };
78
79 struct ipmi_smi_handlers {
80 struct module *owner;
81
82 /* The low-level interface cannot start sending messages to
83 the upper layer until this function is called. This may
84 not be NULL, the lower layer must take the interface from
85 this call. */
86 int (*start_processing)(void *send_info,
87 ipmi_smi_t new_intf);
88
89 /*
90 * Get the detailed private info of the low level interface and store
91 * it into the structure of ipmi_smi_data. For example: the
92 * ACPI device handle will be returned for the pnp_acpi IPMI device.
93 */
94 int (*get_smi_info)(void *send_info, struct ipmi_smi_info *data);
95
96 /* Called to enqueue an SMI message to be sent. This
97 operation is not allowed to fail. If an error occurs, it
98 should report back the error in a received message. It may
99 do this in the current call context, since no write locks
100 are held when this is run. If the priority is > 0, the
101 message will go into a high-priority queue and be sent
102 first. Otherwise, it goes into a normal-priority queue. */
103 void (*sender)(void *send_info,
104 struct ipmi_smi_msg *msg,
105 int priority);
106
107 /* Called by the upper layer to request that we try to get
108 events from the BMC we are attached to. */
109 void (*request_events)(void *send_info);
110
111 /* Called when the interface should go into "run to
112 completion" mode. If this call sets the value to true, the
113 interface should make sure that all messages are flushed
114 out and that none are pending, and any new requests are run
115 to completion immediately. */
116 void (*set_run_to_completion)(void *send_info, int run_to_completion);
117
118 /* Called to poll for work to do. This is so upper layers can
119 poll for operations during things like crash dumps. */
120 void (*poll)(void *send_info);
121
122 /* Enable/disable firmware maintenance mode. Note that this
123 is *not* the modes defined, this is simply an on/off
124 setting. The message handler does the mode handling. Note
125 that this is called from interrupt context, so it cannot
126 block. */
127 void (*set_maintenance_mode)(void *send_info, int enable);
128
129 /* Tell the handler that we are using it/not using it. The
130 message handler get the modules that this handler belongs
131 to; this function lets the SMI claim any modules that it
132 uses. These may be NULL if this is not required. */
133 int (*inc_usecount)(void *send_info);
134 void (*dec_usecount)(void *send_info);
135 };
136
137 struct ipmi_device_id {
138 unsigned char device_id;
139 unsigned char device_revision;
140 unsigned char firmware_revision_1;
141 unsigned char firmware_revision_2;
142 unsigned char ipmi_version;
143 unsigned char additional_device_support;
144 unsigned int manufacturer_id;
145 unsigned int product_id;
146 unsigned char aux_firmware_revision[4];
147 unsigned int aux_firmware_revision_set : 1;
148 };
149
150 #define ipmi_version_major(v) ((v)->ipmi_version & 0xf)
151 #define ipmi_version_minor(v) ((v)->ipmi_version >> 4)
152
153 /* Take a pointer to a raw data buffer and a length and extract device
154 id information from it. The first byte of data must point to the
155 netfn << 2, the data should be of the format:
156 netfn << 2, cmd, completion code, data
157 as normally comes from a device interface. */
ipmi_demangle_device_id(const unsigned char * data,unsigned int data_len,struct ipmi_device_id * id)158 static inline int ipmi_demangle_device_id(const unsigned char *data,
159 unsigned int data_len,
160 struct ipmi_device_id *id)
161 {
162 if (data_len < 9)
163 return -EINVAL;
164 if (data[0] != IPMI_NETFN_APP_RESPONSE << 2 ||
165 data[1] != IPMI_GET_DEVICE_ID_CMD)
166 /* Strange, didn't get the response we expected. */
167 return -EINVAL;
168 if (data[2] != 0)
169 /* That's odd, it shouldn't be able to fail. */
170 return -EINVAL;
171
172 data += 3;
173 data_len -= 3;
174 id->device_id = data[0];
175 id->device_revision = data[1];
176 id->firmware_revision_1 = data[2];
177 id->firmware_revision_2 = data[3];
178 id->ipmi_version = data[4];
179 id->additional_device_support = data[5];
180 if (data_len >= 11) {
181 id->manufacturer_id = (data[6] | (data[7] << 8) |
182 (data[8] << 16));
183 id->product_id = data[9] | (data[10] << 8);
184 } else {
185 id->manufacturer_id = 0;
186 id->product_id = 0;
187 }
188 if (data_len >= 15) {
189 memcpy(id->aux_firmware_revision, data+11, 4);
190 id->aux_firmware_revision_set = 1;
191 } else
192 id->aux_firmware_revision_set = 0;
193
194 return 0;
195 }
196
197 /* Add a low-level interface to the IPMI driver. Note that if the
198 interface doesn't know its slave address, it should pass in zero.
199 The low-level interface should not deliver any messages to the
200 upper layer until the start_processing() function in the handlers
201 is called, and the lower layer must get the interface from that
202 call. */
203 int ipmi_register_smi(struct ipmi_smi_handlers *handlers,
204 void *send_info,
205 struct ipmi_device_id *device_id,
206 struct device *dev,
207 const char *sysfs_name,
208 unsigned char slave_addr);
209
210 /*
211 * Remove a low-level interface from the IPMI driver. This will
212 * return an error if the interface is still in use by a user.
213 */
214 int ipmi_unregister_smi(ipmi_smi_t intf);
215
216 /*
217 * The lower layer reports received messages through this interface.
218 * The data_size should be zero if this is an asyncronous message. If
219 * the lower layer gets an error sending a message, it should format
220 * an error response in the message response.
221 */
222 void ipmi_smi_msg_received(ipmi_smi_t intf,
223 struct ipmi_smi_msg *msg);
224
225 /* The lower layer received a watchdog pre-timeout on interface. */
226 void ipmi_smi_watchdog_pretimeout(ipmi_smi_t intf);
227
228 struct ipmi_smi_msg *ipmi_alloc_smi_msg(void);
ipmi_free_smi_msg(struct ipmi_smi_msg * msg)229 static inline void ipmi_free_smi_msg(struct ipmi_smi_msg *msg)
230 {
231 msg->done(msg);
232 }
233
234 /* Allow the lower layer to add things to the proc filesystem
235 directory for this interface. Note that the entry will
236 automatically be dstroyed when the interface is destroyed. */
237 int ipmi_smi_add_proc_entry(ipmi_smi_t smi, char *name,
238 const struct file_operations *proc_ops,
239 void *data);
240
241 #endif /* __LINUX_IPMI_SMI_H */
242