int a4l_release_driver(a4l_cxt_t * cxt)
{
int ret = 0;
a4l_dev_t *dev = a4l_get_dev(cxt);
if ((ret = dev->driver->detach(dev)) != 0)
goto out_release_driver;
/* Decrease module's count
so as to allow module unloading */
module_put(dev->driver->owner);
/* In case, the driver developer did not free the subdevices */
while (&dev->subdvsq != dev->subdvsq.next) {
struct list_head *this = dev->subdvsq.next;
a4l_subd_t *tmp = list_entry(this, a4l_subd_t, list);
list_del(this);
rtdm_free(tmp);
}
/* Free the private field */
rtdm_free(dev->priv);
dev->driver = NULL;
out_release_driver:
return ret;
}
void a4l_free_lnkdesc(a4l_cxt_t * cxt, a4l_lnkdesc_t * link_arg)
{
if (link_arg->bname != NULL)
rtdm_free(link_arg->bname);
if (link_arg->opts != NULL)
rtdm_free(link_arg->opts);
}
void a4l_free_lnkdesc(a4l_cxt_t * cxt, a4l_lnkdesc_t * link_arg)
{
__a4l_dbg(1, core_dbg,
"a4l_free_lnkdesc: minor=%d\n", a4l_get_minor(cxt));
if (link_arg->bname != NULL)
rtdm_free(link_arg->bname);
if (link_arg->opts != NULL)
rtdm_free(link_arg->opts);
}
int a4l_assign_driver(a4l_cxt_t * cxt,
a4l_drv_t * drv, a4l_lnkdesc_t * link_arg)
{
int ret = 0;
a4l_dev_t *dev = a4l_get_dev(cxt);
__a4l_dbg(1, core_dbg,
"a4l_assign_driver: minor=%d\n", a4l_get_minor(cxt));
dev->driver = drv;
if (drv->privdata_size == 0)
__a4l_dbg(1, core_dbg,
"a4l_assign_driver: warning! "
"the field priv will not be usable\n");
else {
INIT_LIST_HEAD(&dev->subdvsq);
dev->priv = rtdm_malloc(drv->privdata_size);
if (dev->priv == NULL && drv->privdata_size != 0) {
__a4l_err("a4l_assign_driver: "
"call(alloc) failed\n");
ret = -ENOMEM;
goto out_assign_driver;
}
/* Initialize the private data even if it not our role
(the driver should do it), that may prevent hard to
find bugs */
memset(dev->priv, 0, drv->privdata_size);
}
if ((ret = drv->attach(dev, link_arg)) != 0)
__a4l_err("a4l_assign_driver: "
"call(drv->attach) failed (ret=%d)\n",
ret);
out_assign_driver:
/* Increments module's count */
if (ret == 0 && (!try_module_get(drv->owner))) {
__a4l_err("a4l_assign_driver: "
"driver's owner field wrongly set\n");
ret = -ENODEV;
}
if (ret != 0 && dev->priv != NULL) {
rtdm_free(dev->priv);
dev->driver = NULL;
}
return ret;
}
/* --- Command descriptor management functions --- */
int a4l_fill_cmddesc(struct a4l_device_context *cxt, struct a4l_cmd_desc *desc,
unsigned int **chan_descs, void *arg)
{
unsigned int *tmpchans = NULL;
int ret = 0;
ret = rtdm_safe_copy_from_user(rtdm_private_to_fd(cxt),
desc, arg, sizeof(struct a4l_cmd_desc));
if (ret != 0)
goto out_cmddesc;
if (desc->nb_chan == 0) {
ret = -EINVAL;
goto out_cmddesc;
}
tmpchans = rtdm_malloc(desc->nb_chan * sizeof(unsigned int));
if (tmpchans == NULL) {
ret = -ENOMEM;
goto out_cmddesc;
}
ret = rtdm_safe_copy_from_user(rtdm_private_to_fd(cxt),
tmpchans,
desc->chan_descs,
desc->nb_chan * sizeof(unsigned int));
if (ret != 0) {
__a4l_err("%s invalid arguments \n", __FUNCTION__);
goto out_cmddesc;
}
*chan_descs = desc->chan_descs;
desc->chan_descs = tmpchans;
__a4l_dbg(1, core_dbg, "desc dump: \n");
__a4l_dbg(1, core_dbg, "\t->idx_subd=%u\n", desc->idx_subd);
__a4l_dbg(1, core_dbg, "\t->flags=%lu\n", desc->flags);
__a4l_dbg(1, core_dbg, "\t->nb_chan=%u\n", desc->nb_chan);
__a4l_dbg(1, core_dbg, "\t->chan_descs=0x%x\n", *desc->chan_descs);
__a4l_dbg(1, core_dbg, "\t->data_len=%u\n", desc->data_len);
__a4l_dbg(1, core_dbg, "\t->pdata=0x%p\n", desc->data);
out_cmddesc:
if (ret != 0) {
__a4l_err("a4l_fill_cmddesc: %d \n", ret);
if (tmpchans != NULL)
rtdm_free(tmpchans);
desc->chan_descs = NULL;
}
return ret;
}
int a4l_free_insndsc(a4l_cxt_t * cxt, a4l_kinsn_t * dsc)
{
int ret = 0;
if ((dsc->type & A4L_INSN_MASK_READ) != 0)
ret = rtdm_safe_copy_to_user(cxt->user_info,
dsc->__udata,
dsc->data, dsc->data_size);
if (dsc->data != NULL)
rtdm_free(dsc->data);
return ret;
}
static ssize_t uart_rd_rt(struct rtdm_dev_context *context,rtdm_user_info_t * user_info, void *buf,size_t nbyte)
{
int err;
int ret=0;
int count;
MY_DEV *up=(MY_DEV *)context->device->device_data;
u8 *tmp;
printk("..............uart_rd_rt start\n");
tmp=(u8 *)rtdm_malloc(nbyte);
up->buf_rx=(u8 *)tmp;
up->buf_len_rx = nbyte;
count =nbyte;
if (!(up->ier & UART_IER_RDI))
{
up->ier |= UART_IER_RDI;
serial_out(up, UART_IER, up->ier);
}
err=rtdm_event_wait(&up->w_event_rx);
if(err<0)
{
dev_err(up->dev,"controller timed out\n");
rtdm_printk("rtdm_event_timedwait: timeout\n");
return -ETIMEDOUT;
}
if(err==0)
{
ret=nbyte;
}
while(count--)
{
*tmp=read_buffer(up);
printk("Receive rd=%x\n",*tmp);
tmp = tmp +1;
}
tmp=tmp-nbyte;
if(rtdm_safe_copy_to_user(user_info,buf,(void *)tmp, nbyte))
rtdm_printk("ERROR : can't copy data from driver\n");
printk("............uart_rd_rt end\n");
rtdm_free(tmp);
return ret;
}
int a4l_free_ilstdsc(a4l_cxt_t * cxt, a4l_kilst_t * dsc)
{
int i, ret = 0;
if (dsc->insns != NULL) {
for (i = 0; i < dsc->count && ret == 0; i++)
ret = a4l_free_insndsc(cxt, &(dsc->insns[i]));
while (i < dsc->count) {
a4l_free_insndsc(cxt, &(dsc->insns[i]));
i++;
}
rtdm_free(dsc->insns);
}
return ret;
}
int a4l_fill_insndsc(a4l_cxt_t * cxt, a4l_kinsn_t * dsc, void *arg)
{
int ret = 0;
void *tmp_data = NULL;
ret = rtdm_safe_copy_from_user(cxt->user_info,
dsc, arg, sizeof(a4l_insn_t));
if (ret != 0)
goto out_insndsc;
if (dsc->data_size != 0 && dsc->data == NULL) {
__a4l_err("a4l_fill_insndsc: no data pointer specified\n");
ret = -EINVAL;
goto out_insndsc;
}
if (dsc->data_size != 0 && dsc->data != NULL) {
tmp_data = rtdm_malloc(dsc->data_size);
if (tmp_data == NULL) {
ret = -ENOMEM;
goto out_insndsc;
}
if ((dsc->type & A4L_INSN_MASK_WRITE) != 0) {
ret = rtdm_safe_copy_from_user(cxt->user_info,
tmp_data, dsc->data,
dsc->data_size);
if (ret < 0)
goto out_insndsc;
}
}
dsc->__udata = dsc->data;
dsc->data = tmp_data;
out_insndsc:
if (ret != 0 && tmp_data != NULL)
rtdm_free(tmp_data);
return ret;
}
int a4l_proc_attach(a4l_cxt_t * cxt)
{
int ret = 0;
a4l_dev_t *dev = a4l_get_dev(cxt);
struct proc_dir_entry *entry;
char *entry_name, *p;
/* Allocates the buffer for the file name */
entry_name = rtdm_malloc(A4L_NAMELEN + 4);
if ((p = entry_name) == NULL) {
__a4l_err("a4l_proc_attach: failed to allocate buffer\n");
return -ENOMEM;
}
/* Creates the proc file name */
p += sprintf(p, "%02d-", a4l_get_minor(cxt));
strncpy(p, dev->driver->board_name, A4L_NAMELEN);
/* Creates the proc entry */
entry = create_proc_entry(entry_name, 0444, a4l_proc_root);
if (entry == NULL) {
__a4l_err("a4l_proc_attach: "
"failed to create /proc/analogy/%s\n",
entry_name);
ret = -ENOMEM;
goto out_setup_proc_transfer;
}
entry->nlink = 1;
entry->data = &dev->transfer;
entry->write_proc = NULL;
entry->read_proc = a4l_rdproc_transfer;
wrap_proc_dir_entry_owner(entry);
out_setup_proc_transfer:
/* Frees the file name buffer */
rtdm_free(entry_name);
return ret;
}
int a4l_fill_ilstdsc(a4l_cxt_t * cxt, a4l_kilst_t * dsc, void *arg)
{
int i, ret = 0;
dsc->insns = NULL;
/* Recovers the structure from user space */
ret = rtdm_safe_copy_from_user(cxt->user_info,
dsc, arg, sizeof(a4l_insnlst_t));
if (ret < 0)
return ret;
/* Some basic checking */
if (dsc->count == 0) {
__a4l_err("a4l_fill_ilstdsc: instruction list's count is 0\n");
return -EINVAL;
}
/* Keeps the user pointer in an opaque field */
dsc->__uinsns = (a4l_insn_t *)dsc->insns;
dsc->insns = rtdm_malloc(dsc->count * sizeof(a4l_kinsn_t));
if (dsc->insns == NULL)
return -ENOMEM;
/* Recovers the instructions, one by one. This part is not
optimized */
for (i = 0; i < dsc->count && ret == 0; i++)
ret = a4l_fill_insndsc(cxt,
&(dsc->insns[i]),
&(dsc->__uinsns[i]));
/* In case of error, frees the allocated memory */
if (ret < 0 && dsc->insns != NULL)
rtdm_free(dsc->insns);
return ret;
}
void a4l_proc_detach(a4l_cxt_t * cxt)
{
char *entry_name, *p;
a4l_dev_t *dev = a4l_get_dev(cxt);
/* Allocate the buffer for the file name */
entry_name = rtdm_malloc(A4L_NAMELEN + 4);
if ((p = entry_name) == NULL) {
__a4l_err("a4l_proc_detach: "
"failed to allocate filename buffer\n");
return;
}
/* Build the name */
p += sprintf(p, "%02d-", a4l_get_minor(cxt));
strncpy(p, dev->driver->board_name, A4L_NAMELEN);
/* Remove the proc file */
remove_proc_entry(entry_name, a4l_proc_root);
/* Free the temporary buffer */
rtdm_free(entry_name);
}
int a4l_close(struct rtdm_dev_context *context, rtdm_user_info_t * user_info)
{
int err;
a4l_cxt_t *cxt = (a4l_cxt_t *)rtdm_context_to_private(context);
/* Cancel the maybe occuring asynchronous transfer */
err = a4l_cancel_buffer(cxt);
if (err < 0) {
__a4l_err("close: unable to stop the asynchronous transfer\n");
return err;
}
/* Free the buffer which was linked with this context and... */
a4l_free_buffer(cxt->buffer);
/* ...free the other buffer resources (sync) and... */
a4l_cleanup_buffer(cxt->buffer);
/* ...free the structure */
rtdm_free(cxt->buffer);
return 0;
}
static ssize_t uart_wr_rt(struct rtdm_dev_context *context,rtdm_user_info_t * user_info,const void *buf, size_t nbyte)
{
int ret=0;
int err;
int count;
char c;
MY_DEV *up=(MY_DEV *)context->device->device_data;
char *tmp;
up->buf_len_tx = nbyte;
printk("uart_wr_rt start\n");
tmp=rtdm_malloc(nbyte);
if ((rtdm_safe_copy_from_user(user_info,tmp, buf, up->buf_len_tx)))
rtdm_printk("ERROR : can't copy data to driver\n");
count=nbyte;
while(count--)
{
write_buffer(up,*tmp);
tmp=tmp+1;
// up->buf_tx=(char *)tmp;
// printk("up->buf_tx=%x\n",*up->buf_tx);
//enable Trasmitter holding Register
if (!(up->ier & UART_IER_THRI))
{
up->ier |= UART_IER_THRI;
up->systime = rtdm_clock_read();
serial_out(up, UART_IER, up->ier);
}
}
printk("Tx interrupt enable\n");
printk("rtdm_event_wait before\n");
err=rtdm_event_wait(&up->w_event_tx);
if(err<0)
{
dev_err(up->dev,"controller timed out\n");
rtdm_printk("rtdm_event_timedwait: timeout\n");
return -ETIMEDOUT;
}
up->systime1 = rtdm_clock_read();
up->timeout=(up->systime1)-(up->systime);
printk("scheduling latency=%ld\n",up->timeout);
if(err==0)
{
ret=nbyte;
}
printk("rtdm_event_wait after\n");
printk("uart_wr_rt end\n");
rtdm_free(tmp);
return ret;
}
void a4l_free_cmddesc(struct a4l_cmd_desc * desc)
{
if (desc->chan_descs != NULL)
rtdm_free(desc->chan_descs);
}
int a4l_ioctl_cmd(struct a4l_device_context * ctx, void *arg)
{
int ret = 0, simul_flag = 0;
struct a4l_cmd_desc *cmd_desc = NULL;
struct a4l_device *dev = a4l_get_dev(ctx);
unsigned int *chan_descs, *tmp;
struct a4l_subdevice *subd;
/* The command launching cannot be done in real-time because
of some possible buffer allocations in the drivers */
if (rtdm_in_rt_context())
return -ENOSYS;
/* Basically check the device */
if (!test_bit(A4L_DEV_ATTACHED_NR, &dev->flags)) {
__a4l_err("a4l_ioctl_cmd: cannot command "
"an unattached device\n");
return -EINVAL;
}
/* Allocates the command */
cmd_desc = (struct a4l_cmd_desc *) rtdm_malloc(sizeof(struct a4l_cmd_desc));
if (cmd_desc == NULL)
return -ENOMEM;
memset(cmd_desc, 0, sizeof(struct a4l_cmd_desc));
/* Gets the command */
ret = a4l_fill_cmddesc(ctx, cmd_desc, &chan_descs, arg);
if (ret != 0)
goto out_ioctl_cmd;
/* Checks the command */
ret = a4l_check_cmddesc(ctx, cmd_desc);
if (ret != 0)
goto out_ioctl_cmd;
ret = a4l_check_generic_cmdcnt(cmd_desc);
if (ret != 0)
goto out_ioctl_cmd;
ret = a4l_check_specific_cmdcnt(ctx, cmd_desc);
if (ret != 0)
goto out_ioctl_cmd;
__a4l_dbg(1, core_dbg,"1st cmd checks passed\n");
subd = dev->transfer.subds[cmd_desc->idx_subd];
/* Tests the command with the cmdtest function */
if (cmd_desc->flags & A4L_CMD_SIMUL) {
simul_flag = 1;
if (!subd->do_cmdtest) {
__a4l_err("a4l_ioctl_cmd: driver's cmd_test NULL\n");
ret = -EINVAL;
goto out_ioctl_cmd;
}
ret = subd->do_cmdtest(subd, cmd_desc);
if (ret != 0) {
__a4l_err("a4l_ioctl_cmd: driver's cmd_test failed\n");
goto out_ioctl_cmd;
}
__a4l_dbg(1, core_dbg, "driver's cmd checks passed\n");
goto out_ioctl_cmd;
}
/* Gets the transfer system ready */
ret = a4l_setup_buffer(ctx, cmd_desc);
if (ret < 0)
goto out_ioctl_cmd;
/* Eventually launches the command */
ret = subd->do_cmd(subd, cmd_desc);
if (ret != 0) {
a4l_cancel_buffer(ctx);
goto out_ioctl_cmd;
}
out_ioctl_cmd:
if (simul_flag) {
/* copy the kernel based descriptor */
tmp = cmd_desc->chan_descs;
/* return the user based descriptor */
cmd_desc->chan_descs = chan_descs;
rtdm_safe_copy_to_user(rtdm_private_to_fd(ctx), arg, cmd_desc,
sizeof(struct a4l_cmd_desc));
/* make sure we release the memory associated to the kernel */
cmd_desc->chan_descs = tmp;
}
if (ret != 0 || simul_flag == 1) {
a4l_free_cmddesc(cmd_desc);
rtdm_free(cmd_desc);
}
return ret;
}