drivers/ata/pata_parport/on20.c

Source file repositories/reference/linux-study-clean/drivers/ata/pata_parport/on20.c

File Facts

System
Linux kernel
Corpus path
drivers/ata/pata_parport/on20.c
Extension
.c
Size
2955 bytes
Lines
148
Domain
Driver Families
Bucket
drivers/ata
Inferred role
Driver Families: implementation source
Status
source 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

if (pi->mode) {
			w2(4); w2(0x26); buf[k] = r0();
		} else {
			w2(6); l = r1(); w2(4);
			w2(6); h = r1(); w2(4);
			buf[k] = j44(l, h);
		}
	}
	w2(4);
}

static void on20_write_block(struct pi_adapter *pi, char *buf, int count)
{
	int k;

	op(1); vl(1); op(0);

	for (k = 0; k < count; k++) {
		w2(5); w0(buf[k]); w2(7);
	}
	w2(4);
}

static void on20_log_adapter(struct pi_adapter *pi)
{
	char *mode_string[2] = { "4-bit", "8-bit" };

	dev_info(&pi->dev,
		 "OnSpec 90c20 at 0x%x, mode %d (%s), delay %d\n",
		 pi->port, pi->mode, mode_string[pi->mode], pi->delay);
}

static struct pi_protocol on20 = {
	.owner		= THIS_MODULE,
	.name		= "on20",
	.max_mode	= 2,
	.epp_first	= 2,
	.default_delay	= 1,
	.max_units	= 1,
	.write_regr	= on20_write_regr,
	.read_regr	= on20_read_regr,
	.write_block	= on20_write_block,
	.read_block	= on20_read_block,
	.connect	= on20_connect,
	.disconnect	= on20_disconnect,
	.log_adapter	= on20_log_adapter,
};

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Grant R. Guenther <grant@torque.net>");
MODULE_DESCRIPTION("Onspec 90c20 parallel port IDE adapter protocol driver");
module_pata_parport_driver(on20);

Annotation

Implementation Notes