drivers/input/keyboard/jornada680_kbd.c

Source file repositories/reference/linux-study-clean/drivers/input/keyboard/jornada680_kbd.c

File Facts

System
Linux kernel
Corpus path
drivers/input/keyboard/jornada680_kbd.c
Extension
.c
Size
7413 bytes
Lines
245
Domain
Driver Families
Bucket
drivers/input
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

struct jornadakbd {
	struct input_dev *input;
	unsigned short keymap[ARRAY_SIZE(jornada_scancodes)];
	unsigned char length;
	unsigned char old_scan[JORNADA_SCAN_SIZE];
	unsigned char new_scan[JORNADA_SCAN_SIZE];
};

static void jornada_parse_kbd(struct jornadakbd *jornadakbd)
{
	struct input_dev *input_dev = jornadakbd->input;
	unsigned short *keymap = jornadakbd->keymap;
	unsigned int sync_me = 0;
	unsigned int i, j;

	for (i = 0; i < JORNADA_SCAN_SIZE; i++) {
		unsigned char new = jornadakbd->new_scan[i];
		unsigned char old = jornadakbd->old_scan[i];
		unsigned int xor = new ^ old;

		if (xor == 0)
			continue;

		for (j = 0; j < 8; j++) {
			unsigned int bit = 1 << j;
			if (xor & bit) {
				unsigned int scancode = (i << 3) + j;
				input_event(input_dev,
					    EV_MSC, MSC_SCAN, scancode);
				input_report_key(input_dev,
						 keymap[scancode],
						 !(new & bit));
				sync_me = 1;
			}
		}
	}

	if (sync_me)
	    input_sync(input_dev);
}

static void jornada_scan_keyb(unsigned char *s)
{
	int i;
	unsigned short ec_static, dc_static; /* = UINT16_t */
	unsigned char matrix_switch[] = {
		0xfd, 0xff,   /* PTD1 PD(1) */
		0xdf, 0xff,   /* PTD5 PD(5) */
		0x7f, 0xff,   /* PTD7 PD(7) */
		0xff, 0xfe,   /* PTE0 PE(0) */
		0xff, 0xfd,   /* PTE1 PE(1) */
		0xff, 0xf7,   /* PTE3 PE(3) */
		0xff, 0xbf,   /* PTE6 PE(6) */
		0xff, 0x7f,   /* PTE7 PE(7) */
	}, *t = matrix_switch;
	/* PD(x) :
	1.   0xcc0c & (1~(1 << (2*(x)+1)))))
	2.   (0xf0cf & 0xfffff) */
	/* PE(x) :
	1.   0xcc0c & 0xffff
	2.   0xf0cf & (1~(1 << (2*(x)+1))))) */
	unsigned short matrix_PDE[] = {
		0xcc04, 0xf0cf,  /* PD(1) */
		0xc40c, 0xf0cf,	 /* PD(5) */
		0x4c0c, 0xf0cf,  /* PD(7) */
		0xcc0c, 0xf0cd,  /* PE(0) */
		0xcc0c, 0xf0c7,	 /* PE(1) */
		0xcc0c, 0xf04f,  /* PE(3) */
		0xcc0c, 0xd0cf,	 /* PE(6) */
		0xcc0c, 0x70cf,	 /* PE(7) */
	}, *y = matrix_PDE;

	/* Save these control reg bits */
	dc_static = (__raw_readw(PDCR) & (~0xcc0c));
	ec_static = (__raw_readw(PECR) & (~0xf0cf));

	for (i = 0; i < 8; i++) {
		/* disable output for all but the one we want to scan */
		__raw_writew((dc_static | *y++), PDCR);
		__raw_writew((ec_static | *y++), PECR);
		udelay(5);

		/* Get scanline row */
		__raw_writeb(*t++, PDDR);
		__raw_writeb(*t++, PEDR);
		udelay(50);

		/* Read data */
		*s++ = __raw_readb(PCDR);
		*s++ = __raw_readb(PFDR);

Annotation

Implementation Notes