drivers/ssb/sprom.c

Source file repositories/reference/linux-study-clean/drivers/ssb/sprom.c

File Facts

System
Linux kernel
Corpus path
drivers/ssb/sprom.c
Extension
.c
Size
5323 bytes
Lines
205
Domain
Driver Families
Bucket
drivers/ssb
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

#include "ssb_private.h"

#include <linux/ctype.h>
#include <linux/slab.h>


static int(*get_fallback_sprom)(struct ssb_bus *dev, struct ssb_sprom *out);


static int sprom2hex(const u16 *sprom, char *buf, size_t buf_len,
		     size_t sprom_size_words)
{
	int i, pos = 0;

	for (i = 0; i < sprom_size_words; i++)
		pos += scnprintf(buf + pos, buf_len - pos - 1,
				"%04X", swab16(sprom[i]) & 0xFFFF);
	pos += scnprintf(buf + pos, buf_len - pos - 1, "\n");

	return pos + 1;
}

static int hex2sprom(u16 *sprom, const char *dump, size_t len,
		     size_t sprom_size_words)
{
	char c, tmp[5] = { 0 };
	int err, cnt = 0;
	unsigned long parsed;

	/* Strip whitespace at the end. */
	while (len) {
		c = dump[len - 1];
		if (!isspace(c) && c != '\0')
			break;
		len--;
	}
	/* Length must match exactly. */
	if (len != sprom_size_words * 4)
		return -EINVAL;

	while (cnt < sprom_size_words) {
		memcpy(tmp, dump, 4);
		dump += 4;
		err = kstrtoul(tmp, 16, &parsed);
		if (err)
			return err;
		sprom[cnt++] = swab16((u16)parsed);
	}

	return 0;
}

/* Common sprom device-attribute show-handler */
ssize_t ssb_attr_sprom_show(struct ssb_bus *bus, char *buf,
			    int (*sprom_read)(struct ssb_bus *bus, u16 *sprom))
{
	u16 *sprom;
	int err = -ENOMEM;
	ssize_t count = 0;
	size_t sprom_size_words = bus->sprom_size;

	sprom = kcalloc(sprom_size_words, sizeof(u16), GFP_KERNEL);
	if (!sprom)
		goto out;

	/* Use interruptible locking, as the SPROM write might
	 * be holding the lock for several seconds. So allow userspace
	 * to cancel operation.
	 */
	err = -ERESTARTSYS;
	if (mutex_lock_interruptible(&bus->sprom_mutex))
		goto out_kfree;
	err = sprom_read(bus, sprom);
	mutex_unlock(&bus->sprom_mutex);

	if (!err)
		count = sprom2hex(sprom, buf, PAGE_SIZE, sprom_size_words);

out_kfree:
	kfree(sprom);
out:
	return err ? err : count;
}

/* Common sprom device-attribute store-handler */
ssize_t ssb_attr_sprom_store(struct ssb_bus *bus,
			     const char *buf, size_t count,
			     int (*sprom_check_crc)(const u16 *sprom, size_t size),
			     int (*sprom_write)(struct ssb_bus *bus, const u16 *sprom))
{

Annotation

Implementation Notes