drivers/usb/chipidea/debug.c

Source file repositories/reference/linux-study-clean/drivers/usb/chipidea/debug.c

File Facts

System
Linux kernel
Corpus path
drivers/usb/chipidea/debug.c
Extension
.c
Size
8030 bytes
Lines
314
Domain
Driver Families
Bucket
drivers/usb
Inferred role
Driver Families: operation-table or driver-model contract
Status
pattern implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

static const struct file_operations ci_port_test_fops = {
	.open		= ci_port_test_open,
	.write		= ci_port_test_write,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
};

/*
 * ci_qheads_show: DMA contents of all queue heads
 */
static int ci_qheads_show(struct seq_file *s, void *data)
{
	struct ci_hdrc *ci = s->private;
	unsigned long flags;
	unsigned i, j;

	if (ci->role != CI_ROLE_GADGET) {
		seq_printf(s, "not in gadget mode\n");
		return 0;
	}

	spin_lock_irqsave(&ci->lock, flags);
	for (i = 0; i < ci->hw_ep_max/2; i++) {
		struct ci_hw_ep *hweprx = &ci->ci_hw_ep[i];
		struct ci_hw_ep *hweptx =
			&ci->ci_hw_ep[i + ci->hw_ep_max/2];
		seq_printf(s, "EP=%02i: RX=%08X TX=%08X\n",
			   i, (u32)hweprx->qh.dma, (u32)hweptx->qh.dma);
		for (j = 0; j < (sizeof(struct ci_hw_qh)/sizeof(u32)); j++)
			seq_printf(s, " %04X:    %08X    %08X\n", j,
				   *((u32 *)hweprx->qh.ptr + j),
				   *((u32 *)hweptx->qh.ptr + j));
	}
	spin_unlock_irqrestore(&ci->lock, flags);

	return 0;
}
DEFINE_SHOW_ATTRIBUTE(ci_qheads);

/*
 * ci_requests_show: DMA contents of all requests currently queued (all endpts)
 */
static int ci_requests_show(struct seq_file *s, void *data)
{
	struct ci_hdrc *ci = s->private;
	unsigned long flags;
	struct ci_hw_req *req = NULL;
	struct td_node *node, *tmpnode;
	unsigned i, j, qsize = sizeof(struct ci_hw_td)/sizeof(u32);

	if (ci->role != CI_ROLE_GADGET) {
		seq_printf(s, "not in gadget mode\n");
		return 0;
	}

	spin_lock_irqsave(&ci->lock, flags);
	for (i = 0; i < ci->hw_ep_max; i++)
		list_for_each_entry(req, &ci->ci_hw_ep[i].qh.queue, queue) {
			list_for_each_entry_safe(node, tmpnode, &req->tds, td) {
				seq_printf(s, "EP=%02i: TD=%08X %s\n",
					   i % (ci->hw_ep_max / 2),
					   (u32)node->dma,
					   ((i < ci->hw_ep_max/2) ?
					   "RX" : "TX"));

				for (j = 0; j < qsize; j++)
					seq_printf(s, " %04X:    %08X\n", j,
						   *((u32 *)node->ptr + j));
			}
		}
	spin_unlock_irqrestore(&ci->lock, flags);

	return 0;
}
DEFINE_SHOW_ATTRIBUTE(ci_requests);

static int ci_otg_show(struct seq_file *s, void *unused)
{
	struct ci_hdrc *ci = s->private;
	struct otg_fsm *fsm;

	if (!ci || !ci_otg_is_fsm_mode(ci))
		return 0;

	fsm = &ci->fsm;

	/* ------ State ----- */
	seq_printf(s, "OTG state: %s\n\n",
			usb_otg_state_string(ci->otg.state));

Annotation

Implementation Notes