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Commit 8e46a83e authored by Greg Kroah-Hartman's avatar Greg Kroah-Hartman
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i2c: remove proc and sysctl code from i2c-proc as it is no longer used.

parent d0ba67dd
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drivers/i2c/i2c-proc.c
View file @ 8e46a83e
......@@ -37,539 +37,6 @@
#include <linux/i2c-proc.h>
#include <asm/uaccess.h>
static int i2c_parse_reals(int *nrels, void *buffer, int bufsize,
long *results, int magnitude);
static int i2c_write_reals(int nrels, void *buffer, size_t *bufsize,
long *results, int magnitude);
static int i2c_proc_chips(ctl_table * ctl, int write,
struct file *filp, void *buffer,
size_t * lenp);
static int i2c_sysctl_chips(ctl_table * table, int *name, int nlen,
void *oldval, size_t * oldlenp,
void *newval, size_t newlen,
void **context);
#define SENSORS_ENTRY_MAX 20
static struct ctl_table_header *i2c_entries[SENSORS_ENTRY_MAX];
static struct i2c_client *i2c_clients[SENSORS_ENTRY_MAX];
static ctl_table i2c_proc_dev_sensors[] = {
{SENSORS_CHIPS, "chips", NULL, 0, 0644, NULL, &i2c_proc_chips,
&i2c_sysctl_chips},
{0}
};
static ctl_table i2c_proc_dev[] = {
{DEV_SENSORS, "sensors", NULL, 0, 0555, i2c_proc_dev_sensors},
{0},
};
static ctl_table i2c_proc[] = {
{CTL_DEV, "dev", NULL, 0, 0555, i2c_proc_dev},
{0}
};
static struct ctl_table_header *i2c_proc_header;
/* This returns a nice name for a new directory; for example lm78-isa-0310
(for a LM78 chip on the ISA bus at port 0x310), or lm75-i2c-3-4e (for
a LM75 chip on the third i2c bus at address 0x4e).
name is allocated first. */
static char *generate_name(struct i2c_client *client, const char *prefix)
{
struct i2c_adapter *adapter = client->adapter;
int addr = client->addr;
char name_buffer[50], *name;
if (i2c_is_isa_adapter(adapter)) {
sprintf(name_buffer, "%s-isa-%04x", prefix, addr);
} else if (adapter->algo->smbus_xfer || adapter->algo->master_xfer) {
int id = i2c_adapter_id(adapter);
if (id < 0)
return ERR_PTR(-ENOENT);
sprintf(name_buffer, "%s-i2c-%d-%02x", prefix, id, addr);
} else { /* dummy adapter, generate prefix */
int end, i;
sprintf(name_buffer, "%s-", prefix);
end = strlen(name_buffer);
for (i = 0; i < 32; i++) {
if (adapter->algo->name[i] == ' ')
break;
name_buffer[end++] = tolower(adapter->algo->name[i]);
}
name_buffer[end] = 0;
sprintf(name_buffer + end, "-%04x", addr);
}
name = kmalloc(strlen(name_buffer) + 1, GFP_KERNEL);
if (unlikely(!name))
return ERR_PTR(-ENOMEM);
strcpy(name, name_buffer);
return name;
}
/* This rather complex function must be called when you want to add an entry
to /proc/sys/dev/sensors/chips. It also creates a new directory within
/proc/sys/dev/sensors/.
ctl_template should be a template of the newly created directory. It is
copied in memory. The extra2 field of each file is set to point to client.
If any driver wants subdirectories within the newly created directory,
this function must be updated! */
int i2c_register_entry(struct i2c_client *client, const char *prefix,
struct ctl_table *leaf)
{
struct { struct ctl_table root[2], dev[2], sensors[2]; } *tbl;
struct ctl_table_header *hdr;
struct ctl_table *tmp;
const char *name;
int id;
name = generate_name(client, prefix);
if (IS_ERR(name))
return PTR_ERR(name);
for (id = 0; id < SENSORS_ENTRY_MAX; id++) {
if (!i2c_entries[id])
goto free_slot;
}
goto out_free_name;
free_slot:
tbl = kmalloc(sizeof(*tbl), GFP_KERNEL);
if (unlikely(!tbl))
goto out_free_name;
memset(tbl, 0, sizeof(*tbl));
for (tmp = leaf; tmp->ctl_name; tmp++)
tmp->extra2 = client;
tbl->sensors->ctl_name = id+256;
tbl->sensors->procname = name;
tbl->sensors->mode = 0555;
tbl->sensors->child = leaf;
tbl->dev->ctl_name = DEV_SENSORS;
tbl->dev->procname = "sensors";
tbl->dev->mode = 0555;
tbl->dev->child = tbl->sensors;
tbl->root->ctl_name = CTL_DEV;
tbl->root->procname = "dev";
tbl->root->mode = 0555;
tbl->root->child = tbl->dev;
hdr = register_sysctl_table(tbl->root, 0);
if (unlikely(!hdr))
goto out_free_tbl;
i2c_entries[id] = hdr;
i2c_clients[id] = client;
return (id + 256); /* XXX(hch) why?? */
out_free_tbl:
kfree(tbl);
out_free_name:
kfree(name);
return -ENOMEM;
}
void i2c_deregister_entry(int id)
{
id -= 256;
if (i2c_entries[id]) {
struct ctl_table_header *hdr = i2c_entries[id];
struct ctl_table *tbl = hdr->ctl_table;
unregister_sysctl_table(hdr);
kfree(tbl->child->child->procname);
kfree(tbl); /* actually the whole anonymous struct */
}
i2c_entries[id] = NULL;
i2c_clients[id] = NULL;
}
static int i2c_proc_chips(ctl_table * ctl, int write, struct file *filp,
void *buffer, size_t * lenp)
{
char BUF[SENSORS_PREFIX_MAX + 30];
int buflen, curbufsize, i;
struct ctl_table *client_tbl;
if (write)
return 0;
/* If buffer is size 0, or we try to read when not at the start, we
return nothing. Note that I think writing when not at the start
does not work either, but anyway, this is straight from the kernel
sources. */
if (!*lenp || (filp->f_pos && !write)) {
*lenp = 0;
return 0;
}
curbufsize = 0;
for (i = 0; i < SENSORS_ENTRY_MAX; i++)
if (i2c_entries[i]) {
client_tbl =
i2c_entries[i]->ctl_table->child->child;
buflen =
sprintf(BUF, "%d\t%s\n", client_tbl->ctl_name,
client_tbl->procname);
if (buflen + curbufsize > *lenp)
buflen = *lenp - curbufsize;
if(copy_to_user(buffer, BUF, buflen))
return -EFAULT;
curbufsize += buflen;
(char *) buffer += buflen;
}
*lenp = curbufsize;
filp->f_pos += curbufsize;
return 0;
}
static int i2c_sysctl_chips(ctl_table * table, int *name, int nlen,
void *oldval, size_t * oldlenp, void *newval,
size_t newlen, void **context)
{
struct i2c_chips_data data;
int i, oldlen, nrels, maxels,ret=0;
struct ctl_table *client_tbl;
if (oldval && oldlenp && !((ret = get_user(oldlen, oldlenp))) &&
oldlen) {
maxels = oldlen / sizeof(struct i2c_chips_data);
nrels = 0;
for (i = 0; (i < SENSORS_ENTRY_MAX) && (nrels < maxels);
i++)
if (i2c_entries[i]) {
client_tbl =
i2c_entries[i]->ctl_table->child->
child;
data.sysctl_id = client_tbl->ctl_name;
strcpy(data.name, client_tbl->procname);
if(copy_to_user(oldval, &data,
sizeof(struct
i2c_chips_data)))
return -EFAULT;
(char *) oldval +=
sizeof(struct i2c_chips_data);
nrels++;
}
oldlen = nrels * sizeof(struct i2c_chips_data);
if(put_user(oldlen, oldlenp))
return -EFAULT;
}
return ret;
}
/* This function reads or writes a 'real' value (encoded by the combination
of an integer and a magnitude, the last is the power of ten the value
should be divided with) to a /proc/sys directory. To use this function,
you must (before registering the ctl_table) set the extra2 field to the
client, and the extra1 field to a function of the form:
void func(struct i2c_client *client, int operation, int ctl_name,
int *nrels_mag, long *results)
This function can be called for three values of operation. If operation
equals SENSORS_PROC_REAL_INFO, the magnitude should be returned in
nrels_mag. If operation equals SENSORS_PROC_REAL_READ, values should
be read into results. nrels_mag should return the number of elements
read; the maximum number is put in it on entry. Finally, if operation
equals SENSORS_PROC_REAL_WRITE, the values in results should be
written to the chip. nrels_mag contains on entry the number of elements
found.
In all cases, client points to the client we wish to interact with,
and ctl_name is the SYSCTL id of the file we are accessing. */
int i2c_proc_real(ctl_table * ctl, int write, struct file *filp,
void *buffer, size_t * lenp)
{
#define MAX_RESULTS 32
int mag, nrels = MAX_RESULTS;
long results[MAX_RESULTS];
i2c_real_callback callback = ctl->extra1;
struct i2c_client *client = ctl->extra2;
int res;
/* If buffer is size 0, or we try to read when not at the start, we
return nothing. Note that I think writing when not at the start
does not work either, but anyway, this is straight from the kernel
sources. */
if (!*lenp || (filp->f_pos && !write)) {
*lenp = 0;
return 0;
}
/* Get the magnitude */
callback(client, SENSORS_PROC_REAL_INFO, ctl->ctl_name, &mag,
NULL);
if (write) {
/* Read the complete input into results, converting to longs */
res = i2c_parse_reals(&nrels, buffer, *lenp, results, mag);
if (res)
return res;
if (!nrels)
return 0;
/* Now feed this information back to the client */
callback(client, SENSORS_PROC_REAL_WRITE, ctl->ctl_name,
&nrels, results);
filp->f_pos += *lenp;
return 0;
} else { /* read */
/* Get the information from the client into results */
callback(client, SENSORS_PROC_REAL_READ, ctl->ctl_name,
&nrels, results);
/* And write them to buffer, converting to reals */
res = i2c_write_reals(nrels, buffer, lenp, results, mag);
if (res)
return res;
filp->f_pos += *lenp;
return 0;
}
}
/* This function is equivalent to i2c_proc_real, only it interacts with
the sysctl(2) syscall, and returns no reals, but integers */
int i2c_sysctl_real(ctl_table * table, int *name, int nlen,
void *oldval, size_t * oldlenp, void *newval,
size_t newlen, void **context)
{
long results[MAX_RESULTS];
int oldlen, nrels = MAX_RESULTS,ret=0;
i2c_real_callback callback = table->extra1;
struct i2c_client *client = table->extra2;
/* Check if we need to output the old values */
if (oldval && oldlenp && !((ret=get_user(oldlen, oldlenp))) && oldlen) {
callback(client, SENSORS_PROC_REAL_READ, table->ctl_name,
&nrels, results);
/* Note the rounding factor! */
if (nrels * sizeof(long) < oldlen)
oldlen = nrels * sizeof(long);
oldlen = (oldlen / sizeof(long)) * sizeof(long);
if(copy_to_user(oldval, results, oldlen))
return -EFAULT;
if(put_user(oldlen, oldlenp))
return -EFAULT;
}
if (newval && newlen) {
/* Note the rounding factor! */
newlen -= newlen % sizeof(long);
nrels = newlen / sizeof(long);
if(copy_from_user(results, newval, newlen))
return -EFAULT;
/* Get the new values back to the client */
callback(client, SENSORS_PROC_REAL_WRITE, table->ctl_name,
&nrels, results);
}
return ret;
}
/* nrels contains initially the maximum number of elements which can be
put in results, and finally the number of elements actually put there.
A magnitude of 1 will multiply everything with 10; etc.
buffer, bufsize is the character buffer we read from and its length.
results will finally contain the parsed integers.
Buffer should contain several reals, separated by whitespace. A real
has the following syntax:
[ Minus ] Digit* [ Dot Digit* ]
(everything between [] is optional; * means zero or more).
When the next character is unparsable, everything is skipped until the
next whitespace.
WARNING! This is tricky code. I have tested it, but there may still be
hidden bugs in it, even leading to crashes and things!
*/
static int i2c_parse_reals(int *nrels, void *buffer, int bufsize,
long *results, int magnitude)
{
int maxels, min, mag;
long res,ret=0;
char nextchar = 0;
maxels = *nrels;
*nrels = 0;
while (bufsize && (*nrels < maxels)) {
/* Skip spaces at the start */
while (bufsize &&
!((ret=get_user(nextchar, (char *) buffer))) &&
isspace((int) nextchar)) {
bufsize--;
((char *) buffer)++;
}
if (ret)
return -EFAULT;
/* Well, we may be done now */
if (!bufsize)
return 0;
/* New defaults for our result */
min = 0;
res = 0;
mag = magnitude;
/* Check for a minus */
if (!((ret=get_user(nextchar, (char *) buffer)))
&& (nextchar == '-')) {
min = 1;
bufsize--;
((char *) buffer)++;
}
if (ret)
return -EFAULT;
/* Digits before a decimal dot */
while (bufsize &&
!((ret=get_user(nextchar, (char *) buffer))) &&
isdigit((int) nextchar)) {
res = res * 10 + nextchar - '0';
bufsize--;
((char *) buffer)++;
}
if (ret)
return -EFAULT;
/* If mag < 0, we must actually divide here! */
while (mag < 0) {
res = res / 10;
mag++;
}
if (bufsize && (nextchar == '.')) {
/* Skip the dot */
bufsize--;
((char *) buffer)++;
/* Read digits while they are significant */
while (bufsize && (mag > 0) &&
!((ret=get_user(nextchar, (char *) buffer))) &&
isdigit((int) nextchar)) {
res = res * 10 + nextchar - '0';
mag--;
bufsize--;
((char *) buffer)++;
}
if (ret)
return -EFAULT;
}
/* If we are out of data, but mag > 0, we need to scale here */
while (mag > 0) {
res = res * 10;
mag--;
}
/* Skip everything until we hit whitespace */
while (bufsize &&
!((ret=get_user(nextchar, (char *) buffer))) &&
isspace((int) nextchar)) {
bufsize--;
((char *) buffer)++;
}
if (ret)
return -EFAULT;
/* Put res in results */
results[*nrels] = (min ? -1 : 1) * res;
(*nrels)++;
}
/* Well, there may be more in the buffer, but we need no more data.
Ignore anything that is left. */
return 0;
}
static int i2c_write_reals(int nrels, void *buffer, size_t *bufsize,
long *results, int magnitude)
{
#define BUFLEN 20
char BUF[BUFLEN + 1]; /* An individual representation should fit! */
char printfstr[10];
int nr = 0;
int buflen, mag, times;
int curbufsize = 0;
while ((nr < nrels) && (curbufsize < *bufsize)) {
mag = magnitude;
if (nr != 0) {
if(put_user(' ', (char *) buffer))
return -EFAULT;
curbufsize++;
((char *) buffer)++;
}
/* Fill BUF with the representation of the next string */
if (mag <= 0) {
buflen = sprintf(BUF, "%ld", results[nr]);
if (buflen < 0) { /* Oops, a sprintf error! */
*bufsize = 0;
return -EINVAL;
}
while ((mag < 0) && (buflen < BUFLEN)) {
BUF[buflen++] = '0';
mag++;
}
BUF[buflen] = 0;
} else {
times = 1;
for (times = 1; mag-- > 0; times *= 10);
if (results[nr] < 0) {
BUF[0] = '-';
buflen = 1;
} else
buflen = 0;
strcpy(printfstr, "%ld.%0Xld");
printfstr[6] = magnitude + '0';
buflen +=
sprintf(BUF + buflen, printfstr,
abs(results[nr]) / times,
abs(results[nr]) % times);
if (buflen < 0) { /* Oops, a sprintf error! */
*bufsize = 0;
return -EINVAL;
}
}
/* Now copy it to the user-space buffer */
if (buflen + curbufsize > *bufsize)
buflen = *bufsize - curbufsize;
if(copy_to_user(buffer, BUF, buflen))
return -EFAULT;
curbufsize += buflen;
(char *) buffer += buflen;
nr++;
}
if (curbufsize < *bufsize) {
if(put_user('\n', (char *) buffer))
return -EFAULT;
curbufsize++;
}
*bufsize = curbufsize;
return 0;
}
/* Very inefficient for ISA detects, and won't work for 10-bit addresses! */
int i2c_detect(struct i2c_adapter *adapter,
......@@ -703,26 +170,13 @@ int i2c_detect(struct i2c_adapter *adapter,
static int __init i2c_proc_init(void)
{
printk(KERN_INFO "i2c-proc.o version %s (%s)\n", I2C_VERSION, I2C_DATE);
if (!
(i2c_proc_header =
register_sysctl_table(i2c_proc, 0))) {
printk(KERN_ERR "i2c-proc.o: error: sysctl interface not supported by kernel!\n");
return -EPERM;
}
i2c_proc_header->ctl_table->child->de->owner = THIS_MODULE;
return 0;
}
static void __exit i2c_proc_exit(void)
{
unregister_sysctl_table(i2c_proc_header);
}
EXPORT_SYMBOL(i2c_register_entry);
EXPORT_SYMBOL(i2c_deregister_entry);
EXPORT_SYMBOL(i2c_proc_real);
EXPORT_SYMBOL(i2c_sysctl_real);
EXPORT_SYMBOL(i2c_detect);
MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>");
......
include/linux/i2c-proc.h
View file @ 8e46a83e
......@@ -34,46 +34,6 @@ typedef void (*i2c_real_callback) (struct i2c_client * client,
#define SENSORS_PROC_REAL_READ 2
#define SENSORS_PROC_REAL_WRITE 3
/* These funcion reads or writes a 'real' value (encoded by the combination
of an integer and a magnitude, the last is the power of ten the value
should be divided with) to a /proc/sys directory. To use these functions,
you must (before registering the ctl_table) set the extra2 field to the
client, and the extra1 field to a function of the form:
void func(struct i2c_client *client, int operation, int ctl_name,
int *nrels_mag, long *results)
This last function can be called for three values of operation. If
operation equals SENSORS_PROC_REAL_INFO, the magnitude should be returned
in nrels_mag. If operation equals SENSORS_PROC_REAL_READ, values should
be read into results. nrels_mag should return the number of elements
read; the maximum number is put in it on entry. Finally, if operation
equals SENSORS_PROC_REAL_WRITE, the values in results should be
written to the chip. nrels_mag contains on entry the number of elements
found.
In all cases, client points to the client we wish to interact with,
and ctl_name is the SYSCTL id of the file we are accessing. */
extern int i2c_sysctl_real(ctl_table * table, int *name, int nlen,
void *oldval, size_t * oldlenp,
void *newval, size_t newlen,
void **context);
extern int i2c_proc_real(ctl_table * ctl, int write, struct file *filp,
void *buffer, size_t * lenp);
/* These rather complex functions must be called when you want to add or
delete an entry in /proc/sys/dev/sensors/chips (not yet implemented). It
also creates a new directory within /proc/sys/dev/sensors/.
ctl_template should be a template of the newly created directory. It is
copied in memory. The extra2 field of each file is set to point to client.
If any driver wants subdirectories within the newly created directory,
these functions must be updated! */
extern int i2c_register_entry(struct i2c_client *client,
const char *prefix,
ctl_table * ctl_template);
extern void i2c_deregister_entry(int id);
/* A structure containing detect information.
Force variables overrule all other variables; they force a detection on
that place. If a specific chip is given, the module blindly assumes this
......
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