minix/lib/libc/sys-minix/ioctl.c
Thomas Cort 550fdfb443 i2c: initial bus drivers for am335x and dm37xx
Change-Id: I478704fbf30dbf6d3382bcbfb11e75b512c032a1
2013-07-15 11:11:13 -04:00

93 lines
2.1 KiB
C

#include <sys/cdefs.h>
#include "namespace.h"
#include <lib.h>
#include <sys/ioctl.h>
#include <minix/i2c.h>
#ifdef __weak_alias
__weak_alias(ioctl, _ioctl)
#endif
static void rewrite_i2c_netbsd_to_minix(minix_i2c_ioctl_exec_t *out,
i2c_ioctl_exec_t *in);
static void rewrite_i2c_minix_to_netbsd(i2c_ioctl_exec_t *out,
minix_i2c_ioctl_exec_t *in);
static void rewrite_i2c_netbsd_to_minix(minix_i2c_ioctl_exec_t *out,
i2c_ioctl_exec_t *in)
{
memset(out, '\0', sizeof(minix_i2c_ioctl_exec_t));
out->iie_op = in->iie_op;
out->iie_addr = in->iie_addr;
out->iie_cmdlen = I2C_EXEC_MAX_CMDLEN < in->iie_cmdlen ?
I2C_EXEC_MAX_CMDLEN : in->iie_cmdlen;
out->iie_buflen = I2C_EXEC_MAX_BUFLEN < in->iie_buflen ?
I2C_EXEC_MAX_BUFLEN : in->iie_buflen;
if (in->iie_cmdlen > 0 && in->iie_cmd != NULL) {
memcpy(out->iie_cmd, in->iie_cmd, in->iie_cmdlen);
}
if (in->iie_buflen > 0 && in->iie_buf != NULL) {
memcpy(out->iie_buf, in->iie_buf, in->iie_buflen);
}
}
static void rewrite_i2c_minix_to_netbsd(i2c_ioctl_exec_t *out,
minix_i2c_ioctl_exec_t *in)
{
/* the only field that changes is iie_buf, everything else is the same */
if (in->iie_buflen > 0 && in->iie_buf != NULL) {
memcpy(out->iie_buf, in->iie_buf, in->iie_buflen);
}
}
int ioctl(fd, request, data)
int fd;
int request;
void *data;
{
int r, request_save;
message m;
void *addr;
/*
* To support compatibility with interfaces on other systems, certain
* requests are re-written to flat structures (i.e. without pointers).
*/
minix_i2c_ioctl_exec_t i2c;
request_save = request;
switch (request) {
case I2C_IOCTL_EXEC:
rewrite_i2c_netbsd_to_minix(&i2c, data);
addr = (void *) &i2c;
request = MINIX_I2C_IOCTL_EXEC;
break;
default:
/* Keep original as-is */
addr = (void *) data;
break;
}
m.TTY_LINE = fd;
m.TTY_REQUEST = request;
m.ADDRESS = (char *) addr;
r = _syscall(VFS_PROC_NR, IOCTL, &m);
/* Translate back to original form */
switch (request_save) {
case I2C_IOCTL_EXEC:
rewrite_i2c_minix_to_netbsd(data, &i2c);
break;
default:
/* Nothing to do */
break;
}
return r;
}