drivers/tty/hvc/hvc_console.h

Source file repositories/reference/linux-study-clean/drivers/tty/hvc/hvc_console.h

File Facts

System
Linux kernel
Corpus path
drivers/tty/hvc/hvc_console.h
Extension
.h
Size
3339 bytes
Lines
114
Domain
Driver Families
Bucket
drivers/tty
Inferred role
Driver Families: exported/initcall integration point
Status
integration 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

struct hvc_struct {
	struct tty_port port;
	spinlock_t lock;
	int index;
	int do_wakeup;
	int outbuf_size;
	int n_outbuf;
	uint32_t vtermno;
	const struct hv_ops *ops;
	int irq_requested;
	int data;
	struct winsize ws;
	struct work_struct tty_resize;
	struct list_head next;
	unsigned long flags;
	u8 outbuf[] __aligned(sizeof(long));
};

/* implemented by a low level driver */
struct hv_ops {
	ssize_t (*get_chars)(uint32_t vtermno, u8 *buf, size_t count);
	ssize_t (*put_chars)(uint32_t vtermno, const u8 *buf, size_t count);
	int (*flush)(uint32_t vtermno, bool wait);

	/* Callbacks for notification. Called in open, close and hangup */
	int (*notifier_add)(struct hvc_struct *hp, int irq);
	void (*notifier_del)(struct hvc_struct *hp, int irq);
	void (*notifier_hangup)(struct hvc_struct *hp, int irq);

	/* tiocmget/set implementation */
	int (*tiocmget)(struct hvc_struct *hp);
	int (*tiocmset)(struct hvc_struct *hp, unsigned int set, unsigned int clear);

	/* Callbacks to handle tty ports */
	void (*dtr_rts)(struct hvc_struct *hp, bool active);
};

/* Register a vterm and a slot index for use as a console (console_init) */
extern int hvc_instantiate(uint32_t vtermno, int index,
			   const struct hv_ops *ops);

/* register a vterm for hvc tty operation (module_init or hotplug add) */
extern struct hvc_struct * hvc_alloc(uint32_t vtermno, int data,
				     const struct hv_ops *ops, int outbuf_size);
/* remove a vterm from hvc tty operation (module_exit or hotplug remove) */
extern void hvc_remove(struct hvc_struct *hp);

/* data available */
int hvc_poll(struct hvc_struct *hp);
void hvc_kick(void);

/* Resize hvc tty terminal window */
extern void __hvc_resize(struct hvc_struct *hp, struct winsize ws);

static inline void hvc_resize(struct hvc_struct *hp, struct winsize ws)
{
	unsigned long flags;

	spin_lock_irqsave(&hp->lock, flags);
	__hvc_resize(hp, ws);
	spin_unlock_irqrestore(&hp->lock, flags);
}

/* default notifier for irq based notification */
extern int notifier_add_irq(struct hvc_struct *hp, int data);
extern void notifier_del_irq(struct hvc_struct *hp, int data);
extern void notifier_hangup_irq(struct hvc_struct *hp, int data);


#if defined(CONFIG_XMON) && defined(CONFIG_SMP)
#include <asm/xmon.h>
#else
static inline int cpus_are_in_xmon(void)
{
	return 0;
}
#endif

#endif // HVC_CONSOLE_H

Annotation

Implementation Notes