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// SPDX-License-Identifier: GPL-2.0+
/*
* ipmi_si_hotmod.c
*
* Handling for dynamically adding/removing IPMI devices through
* a module parameter (and thus sysfs).
*/
#define pr_fmt(fmt) "ipmi_hotmod: " fmt
#include <linux/moduleparam.h>
#include <linux/ipmi.h>
#include <linux/atomic.h>
#include "ipmi_si.h"
#include "ipmi_plat_data.h"
static int hotmod_handler(const char *val, const struct kernel_param *kp);
module_param_call(hotmod, hotmod_handler, NULL, NULL, 0200);
MODULE_PARM_DESC(hotmod, "Add and remove interfaces. See"
" Documentation/driver-api/ipmi.rst in the kernel sources for the"
" gory details.");
/*
* Parms come in as <op1>[:op2[:op3...]]. ops are:
* add|remove,kcs|bt|smic,mem|i/o,<address>[,<opt1>[,<opt2>[,...]]]
* Options are:
* rsp=<regspacing>
* rsi=<regsize>
* rsh=<regshift>
* irq=<irq>
* ipmb=<ipmb addr>
*/
enum hotmod_op { HM_ADD, HM_REMOVE };
struct hotmod_vals {
const char *name;
const int val;
};
static const struct hotmod_vals hotmod_ops[] = {
{ "add", HM_ADD },
{ "remove", HM_REMOVE },
{ NULL }
};
static const struct hotmod_vals hotmod_si[] = {
{ "kcs", SI_KCS },
{ "smic", SI_SMIC },
{ "bt", SI_BT },
{ NULL }
};
static const struct hotmod_vals hotmod_as[] = {
{ "mem", IPMI_MEM_ADDR_SPACE },
{ "i/o", IPMI_IO_ADDR_SPACE },
{ NULL }
};
static int parse_str(const struct hotmod_vals *v, unsigned int *val, char *name,
const char **curr)
{
char *s;
int i;
s = strchr(*curr, ',');
if (!s) {
pr_warn("No hotmod %s given\n", name);
return -EINVAL;
}
*s = '\0';
s++;
for (i = 0; v[i].name; i++) {
if (strcmp(*curr, v[i].name) == 0) {
*val = v[i].val;
*curr = s;
return 0;
}
}
pr_warn("Invalid hotmod %s '%s'\n", name, *curr);
return -EINVAL;
}
static int check_hotmod_int_op(const char *curr, const char *option,
const char *name, unsigned int *val)
{
char *n;
if (strcmp(curr, name) == 0) {
if (!option) {
pr_warn("No option given for '%s'\n", curr);
return -EINVAL;
}
*val = simple_strtoul(option, &n, 0);
if ((*n != '\0') || (*option == '\0')) {
pr_warn("Bad option given for '%s'\n", curr);
return -EINVAL;
}
return 1;
}
return 0;
}
static int parse_hotmod_str(const char *curr, enum hotmod_op *op,
struct ipmi_plat_data *h)
{
char *s, *o;
int rv;
unsigned int ival;
h->iftype = IPMI_PLAT_IF_SI;
rv = parse_str(hotmod_ops, &ival, "operation", &curr);
if (rv)
return rv;
*op = ival;
rv = parse_str(hotmod_si, &ival, "interface type", &curr);
if (rv)
return rv;
h->type = ival;
rv = parse_str(hotmod_as, &ival, "address space", &curr);
if (rv)
return rv;
h->space = ival;
s = strchr(curr, ',');
if (s) {
*s = '\0';
s++;
}
rv = kstrtoul(curr, 0, &h->addr);
if (rv) {
pr_warn("Invalid hotmod address '%s': %d\n", curr, rv);
return rv;
}
while (s) {
curr = s;
s = strchr(curr, ',');
if (s) {
*s = '\0';
s++;
}
o = strchr(curr, '=');
if (o) {
*o = '\0';
o++;
}
rv = check_hotmod_int_op(curr, o, "rsp", &h->regspacing);
if (rv < 0)
return rv;
else if (rv)
continue;
rv = check_hotmod_int_op(curr, o, "rsi", &h->regsize);
if (rv < 0)
return rv;
else if (rv)
continue;
rv = check_hotmod_int_op(curr, o, "rsh", &h->regshift);
if (rv < 0)
return rv;
else if (rv)
continue;
rv = check_hotmod_int_op(curr, o, "irq", &h->irq);
if (rv < 0)
return rv;
else if (rv)
continue;
rv = check_hotmod_int_op(curr, o, "ipmb", &h->slave_addr);
if (rv < 0)
return rv;
else if (rv)
continue;
pr_warn("Invalid hotmod option '%s'\n", curr);
return -EINVAL;
}
h->addr_source = SI_HOTMOD;
return 0;
}
static atomic_t hotmod_nr;
static int hotmod_handler(const char *val, const struct kernel_param *kp)
{
char *str = kstrdup(val, GFP_KERNEL), *curr, *next;
int rv;
struct ipmi_plat_data h;
unsigned int len;
int ival;
if (!str)
return -ENOMEM;
/* Kill any trailing spaces, as we can get a "\n" from echo. */
len = strlen(str);
ival = len - 1;
while ((ival >= 0) && isspace(str[ival])) {
str[ival] = '\0';
ival--;
}
for (curr = str; curr; curr = next) {
enum hotmod_op op;
next = strchr(curr, ':');
if (next) {
*next = '\0';
next++;
}
memset(&h, 0, sizeof(h));
rv = parse_hotmod_str(curr, &op, &h);
if (rv)
goto out;
if (op == HM_ADD) {
ipmi_platform_add("hotmod-ipmi-si",
atomic_inc_return(&hotmod_nr),
&h);
} else {
struct device *dev;
dev = ipmi_si_remove_by_data(h.space, h.type, h.addr);
if (dev && dev_is_platform(dev)) {
struct platform_device *pdev;
pdev = to_platform_device(dev);
if (strcmp(pdev->name, "hotmod-ipmi-si") == 0)
platform_device_unregister(pdev);
}
if (dev)
put_device(dev);
}
}
rv = len;
out:
kfree(str);
return rv;
}
void ipmi_si_hotmod_exit(void)
{
ipmi_remove_platform_device_by_name("hotmod-ipmi-si");
}
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