Commit | Line | Data |
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243ac210 | 1 | // SPDX-License-Identifier: GPL-2.0+ |
44814ec9 CM |
2 | /* |
3 | * ipmi_si_hotmod.c | |
4 | * | |
5 | * Handling for dynamically adding/removing IPMI devices through | |
6 | * a module parameter (and thus sysfs). | |
7 | */ | |
25880f7d JP |
8 | |
9 | #define pr_fmt(fmt) "ipmi_hotmod: " fmt | |
10 | ||
44814ec9 CM |
11 | #include <linux/moduleparam.h> |
12 | #include <linux/ipmi.h> | |
3bb8ea40 | 13 | #include <linux/atomic.h> |
44814ec9 | 14 | #include "ipmi_si.h" |
3bb8ea40 | 15 | #include "ipmi_plat_data.h" |
44814ec9 | 16 | |
6297fabd | 17 | static int hotmod_handler(const char *val, const struct kernel_param *kp); |
44814ec9 CM |
18 | |
19 | module_param_call(hotmod, hotmod_handler, NULL, NULL, 0200); | |
07cbd87b AS |
20 | MODULE_PARM_DESC(hotmod, |
21 | "Add and remove interfaces. See Documentation/driver-api/ipmi.rst in the kernel sources for the gory details."); | |
44814ec9 CM |
22 | |
23 | /* | |
24 | * Parms come in as <op1>[:op2[:op3...]]. ops are: | |
25 | * add|remove,kcs|bt|smic,mem|i/o,<address>[,<opt1>[,<opt2>[,...]]] | |
26 | * Options are: | |
27 | * rsp=<regspacing> | |
28 | * rsi=<regsize> | |
29 | * rsh=<regshift> | |
30 | * irq=<irq> | |
31 | * ipmb=<ipmb addr> | |
32 | */ | |
33 | enum hotmod_op { HM_ADD, HM_REMOVE }; | |
34 | struct hotmod_vals { | |
35 | const char *name; | |
36 | const int val; | |
37 | }; | |
38 | ||
39 | static const struct hotmod_vals hotmod_ops[] = { | |
40 | { "add", HM_ADD }, | |
41 | { "remove", HM_REMOVE }, | |
42 | { NULL } | |
43 | }; | |
44 | ||
45 | static const struct hotmod_vals hotmod_si[] = { | |
46 | { "kcs", SI_KCS }, | |
47 | { "smic", SI_SMIC }, | |
48 | { "bt", SI_BT }, | |
49 | { NULL } | |
50 | }; | |
51 | ||
52 | static const struct hotmod_vals hotmod_as[] = { | |
53 | { "mem", IPMI_MEM_ADDR_SPACE }, | |
54 | { "i/o", IPMI_IO_ADDR_SPACE }, | |
55 | { NULL } | |
56 | }; | |
57 | ||
3bb8ea40 CM |
58 | static int parse_str(const struct hotmod_vals *v, unsigned int *val, char *name, |
59 | const char **curr) | |
44814ec9 CM |
60 | { |
61 | char *s; | |
62 | int i; | |
63 | ||
64 | s = strchr(*curr, ','); | |
65 | if (!s) { | |
25880f7d | 66 | pr_warn("No hotmod %s given\n", name); |
44814ec9 CM |
67 | return -EINVAL; |
68 | } | |
69 | *s = '\0'; | |
70 | s++; | |
71 | for (i = 0; v[i].name; i++) { | |
72 | if (strcmp(*curr, v[i].name) == 0) { | |
73 | *val = v[i].val; | |
74 | *curr = s; | |
75 | return 0; | |
76 | } | |
77 | } | |
78 | ||
25880f7d | 79 | pr_warn("Invalid hotmod %s '%s'\n", name, *curr); |
44814ec9 CM |
80 | return -EINVAL; |
81 | } | |
82 | ||
83 | static int check_hotmod_int_op(const char *curr, const char *option, | |
3bb8ea40 | 84 | const char *name, unsigned int *val) |
44814ec9 CM |
85 | { |
86 | char *n; | |
87 | ||
88 | if (strcmp(curr, name) == 0) { | |
89 | if (!option) { | |
25880f7d | 90 | pr_warn("No option given for '%s'\n", curr); |
44814ec9 CM |
91 | return -EINVAL; |
92 | } | |
93 | *val = simple_strtoul(option, &n, 0); | |
94 | if ((*n != '\0') || (*option == '\0')) { | |
25880f7d | 95 | pr_warn("Bad option given for '%s'\n", curr); |
44814ec9 CM |
96 | return -EINVAL; |
97 | } | |
98 | return 1; | |
99 | } | |
100 | return 0; | |
101 | } | |
102 | ||
3bb8ea40 CM |
103 | static int parse_hotmod_str(const char *curr, enum hotmod_op *op, |
104 | struct ipmi_plat_data *h) | |
105 | { | |
106 | char *s, *o; | |
107 | int rv; | |
108 | unsigned int ival; | |
109 | ||
d7323638 | 110 | h->iftype = IPMI_PLAT_IF_SI; |
3bb8ea40 CM |
111 | rv = parse_str(hotmod_ops, &ival, "operation", &curr); |
112 | if (rv) | |
113 | return rv; | |
114 | *op = ival; | |
115 | ||
116 | rv = parse_str(hotmod_si, &ival, "interface type", &curr); | |
117 | if (rv) | |
118 | return rv; | |
119 | h->type = ival; | |
120 | ||
121 | rv = parse_str(hotmod_as, &ival, "address space", &curr); | |
122 | if (rv) | |
123 | return rv; | |
124 | h->space = ival; | |
125 | ||
126 | s = strchr(curr, ','); | |
127 | if (s) { | |
128 | *s = '\0'; | |
129 | s++; | |
130 | } | |
131 | rv = kstrtoul(curr, 0, &h->addr); | |
132 | if (rv) { | |
133 | pr_warn("Invalid hotmod address '%s': %d\n", curr, rv); | |
134 | return rv; | |
135 | } | |
136 | ||
137 | while (s) { | |
138 | curr = s; | |
139 | s = strchr(curr, ','); | |
140 | if (s) { | |
141 | *s = '\0'; | |
142 | s++; | |
143 | } | |
144 | o = strchr(curr, '='); | |
145 | if (o) { | |
146 | *o = '\0'; | |
147 | o++; | |
148 | } | |
149 | rv = check_hotmod_int_op(curr, o, "rsp", &h->regspacing); | |
150 | if (rv < 0) | |
151 | return rv; | |
152 | else if (rv) | |
153 | continue; | |
154 | rv = check_hotmod_int_op(curr, o, "rsi", &h->regsize); | |
155 | if (rv < 0) | |
156 | return rv; | |
157 | else if (rv) | |
158 | continue; | |
159 | rv = check_hotmod_int_op(curr, o, "rsh", &h->regshift); | |
160 | if (rv < 0) | |
161 | return rv; | |
162 | else if (rv) | |
163 | continue; | |
164 | rv = check_hotmod_int_op(curr, o, "irq", &h->irq); | |
165 | if (rv < 0) | |
166 | return rv; | |
167 | else if (rv) | |
168 | continue; | |
169 | rv = check_hotmod_int_op(curr, o, "ipmb", &h->slave_addr); | |
170 | if (rv < 0) | |
171 | return rv; | |
172 | else if (rv) | |
173 | continue; | |
174 | ||
175 | pr_warn("Invalid hotmod option '%s'\n", curr); | |
176 | return -EINVAL; | |
177 | } | |
178 | ||
179 | h->addr_source = SI_HOTMOD; | |
180 | return 0; | |
181 | } | |
182 | ||
183 | static atomic_t hotmod_nr; | |
184 | ||
6297fabd | 185 | static int hotmod_handler(const char *val, const struct kernel_param *kp) |
44814ec9 | 186 | { |
44814ec9 | 187 | int rv; |
3bb8ea40 | 188 | struct ipmi_plat_data h; |
d14ce8c7 | 189 | char *str, *curr, *next; |
44814ec9 | 190 | |
d14ce8c7 | 191 | str = kstrdup(val, GFP_KERNEL); |
44814ec9 CM |
192 | if (!str) |
193 | return -ENOMEM; | |
194 | ||
195 | /* Kill any trailing spaces, as we can get a "\n" from echo. */ | |
d14ce8c7 | 196 | for (curr = strstrip(str); curr; curr = next) { |
3bb8ea40 | 197 | enum hotmod_op op; |
44814ec9 CM |
198 | |
199 | next = strchr(curr, ':'); | |
200 | if (next) { | |
201 | *next = '\0'; | |
202 | next++; | |
203 | } | |
204 | ||
3bb8ea40 CM |
205 | memset(&h, 0, sizeof(h)); |
206 | rv = parse_hotmod_str(curr, &op, &h); | |
44814ec9 | 207 | if (rv) |
44814ec9 | 208 | goto out; |
44814ec9 CM |
209 | |
210 | if (op == HM_ADD) { | |
3bb8ea40 CM |
211 | ipmi_platform_add("hotmod-ipmi-si", |
212 | atomic_inc_return(&hotmod_nr), | |
213 | &h); | |
44814ec9 | 214 | } else { |
bdb57b7b CM |
215 | struct device *dev; |
216 | ||
217 | dev = ipmi_si_remove_by_data(h.space, h.type, h.addr); | |
218 | if (dev && dev_is_platform(dev)) { | |
219 | struct platform_device *pdev; | |
220 | ||
221 | pdev = to_platform_device(dev); | |
222 | if (strcmp(pdev->name, "hotmod-ipmi-si") == 0) | |
223 | platform_device_unregister(pdev); | |
224 | } | |
25f314db | 225 | put_device(dev); |
44814ec9 CM |
226 | } |
227 | } | |
d14ce8c7 | 228 | rv = strlen(val); |
44814ec9 CM |
229 | out: |
230 | kfree(str); | |
231 | return rv; | |
232 | } | |
bdb57b7b | 233 | |
bdb57b7b CM |
234 | void ipmi_si_hotmod_exit(void) |
235 | { | |
e17c6571 | 236 | ipmi_remove_platform_device_by_name("hotmod-ipmi-si"); |
bdb57b7b | 237 | } |