98 lines
2.3 KiB
C
98 lines
2.3 KiB
C
#include <sys/cdefs.h>
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#include "namespace.h"
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#include <lib.h>
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#include <stdarg.h>
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#include <sys/ioctl.h>
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#include <minix/i2c.h>
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#include <string.h>
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#include <sys/ioccom.h>
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#include <stdarg.h>
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static void rewrite_i2c_netbsd_to_minix(minix_i2c_ioctl_exec_t *out,
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i2c_ioctl_exec_t *in);
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static void rewrite_i2c_minix_to_netbsd(i2c_ioctl_exec_t *out,
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minix_i2c_ioctl_exec_t *in);
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static void rewrite_i2c_netbsd_to_minix(minix_i2c_ioctl_exec_t *out,
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i2c_ioctl_exec_t *in)
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{
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memset(out, '\0', sizeof(minix_i2c_ioctl_exec_t));
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out->iie_op = in->iie_op;
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out->iie_addr = in->iie_addr;
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out->iie_cmdlen = I2C_EXEC_MAX_CMDLEN < in->iie_cmdlen ?
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I2C_EXEC_MAX_CMDLEN : in->iie_cmdlen;
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out->iie_buflen = I2C_EXEC_MAX_BUFLEN < in->iie_buflen ?
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I2C_EXEC_MAX_BUFLEN : in->iie_buflen;
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if (in->iie_cmdlen > 0 && in->iie_cmd != NULL) {
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memcpy(out->iie_cmd, in->iie_cmd, in->iie_cmdlen);
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}
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if (in->iie_buflen > 0 && in->iie_buf != NULL) {
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memcpy(out->iie_buf, in->iie_buf, in->iie_buflen);
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}
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}
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static void rewrite_i2c_minix_to_netbsd(i2c_ioctl_exec_t *out,
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minix_i2c_ioctl_exec_t *in)
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{
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/* the only field that changes is iie_buf, everything else is the same */
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if (in->iie_buflen > 0 && in->iie_buf != NULL) {
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memcpy(out->iie_buf, in->iie_buf, in->iie_buflen);
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}
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}
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int ioctl(int fd, unsigned long request, ...)
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{
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int r, request_save;
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message m;
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void *addr;
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void *data;
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va_list ap;
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va_start(ap, request);
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data = va_arg(ap, void *);
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/*
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* To support compatibility with interfaces on other systems, certain
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* requests are re-written to flat structures (i.e. without pointers).
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*/
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minix_i2c_ioctl_exec_t i2c;
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request_save = request;
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switch (request) {
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case I2C_IOCTL_EXEC:
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rewrite_i2c_netbsd_to_minix(&i2c, data);
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addr = (void *) &i2c;
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request = MINIX_I2C_IOCTL_EXEC;
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break;
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default:
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/* Keep original as-is */
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addr = (void *) data;
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break;
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}
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memset(&m, 0, sizeof(m));
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m.m_lc_vfs_ioctl.fd = fd;
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m.m_lc_vfs_ioctl.req = request;
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m.m_lc_vfs_ioctl.arg = addr;
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r = _syscall(VFS_PROC_NR, VFS_IOCTL, &m);
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/* Translate back to original form */
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switch (request_save) {
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case I2C_IOCTL_EXEC:
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rewrite_i2c_minix_to_netbsd(data, &i2c);
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break;
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default:
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/* Nothing to do */
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break;
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}
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va_end(ap);
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return r;
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}
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