drivers/w1/slaves/w1_ds2430.c

Source file repositories/reference/linux-study-clean/drivers/w1/slaves/w1_ds2430.c

File Facts

System
Linux kernel
Corpus path
drivers/w1/slaves/w1_ds2430.c
Extension
.c
Size
6953 bytes
Lines
296
Domain
Driver Families
Bucket
drivers/w1
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 (len < W1_F14_SCRATCH_SIZE || addr & W1_F14_SCRATCH_MASK) {
			char tmp[W1_F14_SCRATCH_SIZE];

			/* read the block and update the parts to be written */
			if (w1_f14_readblock(sl, addr & ~W1_F14_SCRATCH_MASK,
					W1_F14_SCRATCH_SIZE, tmp)) {
				count = -EIO;
				goto out_up;
			}

			/* copy at most to the boundary of the PAGE or len */
			copy = W1_F14_SCRATCH_SIZE -
				(addr & W1_F14_SCRATCH_MASK);

			if (copy > len)
				copy = len;

			memcpy(&tmp[addr & W1_F14_SCRATCH_MASK], buf, copy);
			if (w1_f14_write(sl, addr & ~W1_F14_SCRATCH_MASK,
					W1_F14_SCRATCH_SIZE, tmp) < 0) {
				count = -EIO;
				goto out_up;
			}
		} else {

			copy = W1_F14_SCRATCH_SIZE;
			if (w1_f14_write(sl, addr, copy, buf) < 0) {
				count = -EIO;
				goto out_up;
			}
		}
		buf += copy;
		addr += copy;
		len -= copy;
	}

out_up:
	mutex_unlock(&sl->master->bus_mutex);

	return count;
}

static const BIN_ATTR_RW(eeprom, W1_F14_EEPROM_SIZE);

static const struct bin_attribute *const w1_f14_bin_attrs[] = {
	&bin_attr_eeprom,
	NULL,
};

static const struct attribute_group w1_f14_group = {
	.bin_attrs = w1_f14_bin_attrs,
};

static const struct attribute_group *w1_f14_groups[] = {
	&w1_f14_group,
	NULL,
};

static const struct w1_family_ops w1_f14_fops = {
	.groups	= w1_f14_groups,
};

static struct w1_family w1_family_14 = {
	.fid = W1_EEPROM_DS2430,
	.fops = &w1_f14_fops,
};
module_w1_family(w1_family_14);

MODULE_AUTHOR("Angelo Dureghello <angelo.dureghello@timesys.com>");
MODULE_DESCRIPTION("w1 family 14 driver for DS2430, 256b EEPROM");
MODULE_LICENSE("GPL");
MODULE_ALIAS("w1-family-" __stringify(W1_EEPROM_DS2430));

Annotation

Implementation Notes