minix/lib/libdevman/generic.c

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#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <sys/queue.h>
#include <minix/com.h>
#include <minix/ipc.h>
#include <minix/const.h>
#include <minix/devman.h>
#include <minix/safecopies.h>
#include <minix/sysutil.h>
#include <minix/ds.h>
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#include "local.h"
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static endpoint_t devman_ep;
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static int save_string(char *buffer, char *src, size_t *offset);
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static TAILQ_HEAD(devlist_head, devman_dev) dev_list;
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/****************************************************************************
* save_string *
***************************************************************************/
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static int save_string(char *buffer, char *src, size_t *offset)
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{
unsigned old_offset = *offset;
size_t len = strlen(src) + 1;
memcpy(buffer + *offset, src, len);
*offset += len;
return old_offset;
}
/****************************************************************************
* serialize_dev *
***************************************************************************/
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void *serialize_dev(struct devman_dev *dev, size_t *overall_size)
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{
/* determine size of serialized version of dev */
char *buffer;
char *string_buffer;
size_t string_buffer_offset;
size_t count = 0;
size_t size = sizeof(struct devman_device_info);
size_t strings_size = strlen(dev->name) + 1;
struct devman_device_info * serialized_dev;
struct devman_device_info_entry *entry;
struct devman_static_attribute *attribute;
TAILQ_FOREACH(attribute, &dev->attrs, list) {
strings_size += strlen(attribute->name) + 1;
strings_size += strlen(attribute->data) + 1;
size += sizeof(struct devman_device_info_entry);
count++;
}
buffer = malloc(size + strings_size);
if (buffer == NULL) {
return NULL;
}
string_buffer = buffer;
string_buffer_offset = size; /* strings start after
devman_device_info and
devman_device_info_entries */
/* serialize device */
serialized_dev = (struct devman_device_info *) buffer;
serialized_dev->count = count;
serialized_dev->parent_dev_id = dev->parent_dev_id;
serialized_dev->name_offset =
save_string(string_buffer, dev->name, &string_buffer_offset);
#if 0
serialized_dev->bus =
save_string(string_buffer, dev->bus, &string_buffer_offset);
#endif
/* serialize entries */
entry =
(struct devman_device_info_entry *)
(buffer + sizeof(struct devman_device_info));
TAILQ_FOREACH(attribute, &dev->attrs, list) {
entry->type = 0; /* TODO: use macro */
entry->name_offset =
save_string(string_buffer, attribute->name, &string_buffer_offset);
entry->data_offset =
save_string(string_buffer, attribute->data, &string_buffer_offset);
entry++;
}
*overall_size = size + strings_size;
return buffer;
}
/****************************************************************************
* devman_add_device *
***************************************************************************/
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int devman_add_device(struct devman_dev *dev)
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{
message msg;
int res;
size_t grant_size;
void *buf = serialize_dev(dev, &grant_size);
cp_grant_id_t gid =
cpf_grant_direct(devman_ep,(vir_bytes) buf,
grant_size, CPF_READ);
/* prepare message */
msg.m_type = DEVMAN_ADD_DEV;
msg.DEVMAN_GRANT_ID = gid;
msg.DEVMAN_GRANT_SIZE = grant_size;
/* send message */
res = sendrec(devman_ep, &msg);
if (res != 0) {
panic("devman_add_device: could not talk to devman: %d", res);
}
if (msg.m_type != DEVMAN_REPLY) {
panic("devman_add_device: got illegal response from devman: %d",
msg.m_type);
}
if (msg.DEVMAN_RESULT != 0) {
panic("devman_add_device: could add device: %d",
msg.DEVMAN_RESULT);
}
/* store given dev_id to dev */
dev->dev_id = msg.DEVMAN_DEVICE_ID;
cpf_revoke(gid);
free(buf);
/* put device in list */
TAILQ_INSERT_HEAD(&dev_list, dev, dev_list);
return 0;
}
/****************************************************************************
* devman_del_device *
***************************************************************************/
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int devman_del_device(struct devman_dev *dev)
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{
message msg;
int res;
msg.m_type = DEVMAN_DEL_DEV;
msg.DEVMAN_DEVICE_ID = dev->dev_id;
res = sendrec(devman_ep, &msg);
if (res != 0) {
panic("devman_del_device: could not talk to devman: %d", res);
}
if (msg.m_type != DEVMAN_REPLY) {
panic("devman_del_device: got illegal response from devman: %d",
msg.m_type);
}
if (msg.DEVMAN_RESULT != 0) {
panic("devman_del_device: could delete device: %d",
msg.DEVMAN_RESULT);
}
/* remove the device from list */
TAILQ_REMOVE(&dev_list, dev, dev_list);
return 0;
}
/****************************************************************************
* devman_get_ep *
***************************************************************************/
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endpoint_t devman_get_ep()
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{
return devman_ep;
}
/****************************************************************************
* devman_init *
***************************************************************************/
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int devman_init()
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{
int res;
/* get the endpoint of the HCD */
res = ds_retrieve_label_endpt("devman", &devman_ep);
if (res != 0) {
panic("usb_init: ds_retrieve_label_endpt failed for 'devman': %d", res);
}
TAILQ_INIT(&dev_list);
return res;
}
/****************************************************************************
* do_bind *
***************************************************************************/
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static void do_bind(message *m)
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{
struct devman_dev *dev;
int res;
/* find device */
TAILQ_FOREACH(dev, &dev_list, dev_list) {
if (dev->dev_id == m->DEVMAN_DEVICE_ID) {
if (dev->bind_cb) {
res = dev->bind_cb(dev->data, m->DEVMAN_ENDPOINT);
m->m_type = DEVMAN_REPLY;
m->DEVMAN_RESULT = res;
send(devman_ep, m);
return;
}
}
}
m->m_type = DEVMAN_REPLY;
m->DEVMAN_RESULT = ENODEV;
send(devman_ep, m);
return;
}
/****************************************************************************
* do_unbind *
***************************************************************************/
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static void do_unbind(message *m)
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{
struct devman_dev *dev;
int res;
/* find device */
TAILQ_FOREACH(dev, &dev_list, dev_list) {
if (dev->dev_id == m->DEVMAN_DEVICE_ID) {
if (dev->unbind_cb) {
res = dev->unbind_cb(dev->data, m->DEVMAN_ENDPOINT);
m->m_type = DEVMAN_REPLY;
m->DEVMAN_RESULT = res;
send(devman_ep, m);
return;
}
}
}
m->m_type = DEVMAN_REPLY;
m->DEVMAN_RESULT = ENODEV;
send(devman_ep, m);
}
/****************************************************************************
* devman_handle_msg *
***************************************************************************/
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int devman_handle_msg(message *m)
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{
/* make sure msg comes from devman server */
if (m->m_source != devman_ep) {
/* we don't honor requests from others by answering them */
return 0;
}
switch (m->m_type) {
case DEVMAN_BIND:
do_bind(m);
return 1;
case DEVMAN_UNBIND:
do_unbind(m);
return 1;
default:
return 0;
}
}