1 // SPDX-License-Identifier: GPL-2.0+
5 * Handling for dynamically adding/removing IPMI devices through
6 * a module parameter (and thus sysfs).
9 #define pr_fmt(fmt) "ipmi_hotmod: " fmt
11 #include <linux/moduleparam.h>
12 #include <linux/ipmi.h>
15 static int hotmod_handler(const char *val, const struct kernel_param *kp);
17 module_param_call(hotmod, hotmod_handler, NULL, NULL, 0200);
18 MODULE_PARM_DESC(hotmod, "Add and remove interfaces. See"
19 " Documentation/IPMI.txt in the kernel sources for the"
23 * Parms come in as <op1>[:op2[:op3...]]. ops are:
24 * add|remove,kcs|bt|smic,mem|i/o,<address>[,<opt1>[,<opt2>[,...]]]
32 enum hotmod_op { HM_ADD, HM_REMOVE };
38 static const struct hotmod_vals hotmod_ops[] = {
40 { "remove", HM_REMOVE },
44 static const struct hotmod_vals hotmod_si[] = {
51 static const struct hotmod_vals hotmod_as[] = {
52 { "mem", IPMI_MEM_ADDR_SPACE },
53 { "i/o", IPMI_IO_ADDR_SPACE },
57 static int parse_str(const struct hotmod_vals *v, int *val, char *name,
63 s = strchr(*curr, ',');
65 pr_warn("No hotmod %s given\n", name);
70 for (i = 0; v[i].name; i++) {
71 if (strcmp(*curr, v[i].name) == 0) {
78 pr_warn("Invalid hotmod %s '%s'\n", name, *curr);
82 static int check_hotmod_int_op(const char *curr, const char *option,
83 const char *name, int *val)
87 if (strcmp(curr, name) == 0) {
89 pr_warn("No option given for '%s'\n", curr);
92 *val = simple_strtoul(option, &n, 0);
93 if ((*n != '\0') || (*option == '\0')) {
94 pr_warn("Bad option given for '%s'\n", curr);
102 static int hotmod_handler(const char *val, const struct kernel_param *kp)
104 char *str = kstrdup(val, GFP_KERNEL);
106 char *next, *curr, *s, *n, *o;
108 enum si_type si_type;
122 /* Kill any trailing spaces, as we can get a "\n" from echo. */
125 while ((ival >= 0) && isspace(str[ival])) {
130 for (curr = str; curr; curr = next) {
135 ipmb = 0; /* Choose the default if not specified */
137 next = strchr(curr, ':');
143 rv = parse_str(hotmod_ops, &ival, "operation", &curr);
148 rv = parse_str(hotmod_si, &ival, "interface type", &curr);
153 rv = parse_str(hotmod_as, &addr_space, "address space", &curr);
157 s = strchr(curr, ',');
162 addr = simple_strtoul(curr, &n, 0);
163 if ((*n != '\0') || (*curr == '\0')) {
164 pr_warn("Invalid hotmod address '%s'\n", curr);
170 s = strchr(curr, ',');
175 o = strchr(curr, '=');
180 rv = check_hotmod_int_op(curr, o, "rsp", ®spacing);
185 rv = check_hotmod_int_op(curr, o, "rsi", ®size);
190 rv = check_hotmod_int_op(curr, o, "rsh", ®shift);
195 rv = check_hotmod_int_op(curr, o, "irq", &irq);
200 rv = check_hotmod_int_op(curr, o, "ipmb", &ipmb);
207 pr_warn("Invalid hotmod option '%s'\n", curr);
214 memset(&io, 0, sizeof(io));
215 io.addr_source = SI_HOTMOD;
216 io.si_type = si_type;
218 io.addr_type = addr_space;
221 io.regspacing = regspacing;
223 io.regspacing = DEFAULT_REGSPACING;
224 io.regsize = regsize;
226 io.regsize = DEFAULT_REGSIZE;
227 io.regshift = regshift;
230 io.irq_setup = ipmi_std_irq_setup;
231 io.slave_addr = ipmb;
233 rv = ipmi_si_add_smi(&io);
237 ipmi_si_remove_by_data(addr_space, si_type, addr);