drivers/most/most_usb.c

Source file repositories/reference/linux-study-clean/drivers/most/most_usb.c

File Facts

System
Linux kernel
Corpus path
drivers/most/most_usb.c
Extension
.c
Size
32583 bytes
Lines
1163
Domain
Driver Families
Bucket
drivers/most
Inferred role
Driver Families: operation-table or driver-model contract
Status
pattern 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

static const struct file_operations hdm_usb_fops = {
	.owner = THIS_MODULE,
};

/*
 * usb_device_id - ID table for HCD device probing
 */
static const struct usb_device_id usbid[] = {
	{ USB_DEVICE(USB_VENDOR_ID_SMSC, USB_DEV_ID_BRDG), },
	{ USB_DEVICE(USB_VENDOR_ID_SMSC, USB_DEV_ID_OS81118), },
	{ USB_DEVICE(USB_VENDOR_ID_SMSC, USB_DEV_ID_OS81119), },
	{ USB_DEVICE(USB_VENDOR_ID_SMSC, USB_DEV_ID_OS81210), },
	{ } /* Terminating entry */
};

struct regs {
	const char *name;
	u16 reg;
};

static const struct regs ro_regs[] = {
	{ "ni_state", DRCI_REG_NI_STATE },
	{ "packet_bandwidth", DRCI_REG_PACKET_BW },
	{ "node_address", DRCI_REG_NODE_ADDR },
	{ "node_position", DRCI_REG_NODE_POS },
};

static const struct regs rw_regs[] = {
	{ "mep_filter", DRCI_REG_MEP_FILTER },
	{ "mep_hash0", DRCI_REG_HASH_TBL0 },
	{ "mep_hash1", DRCI_REG_HASH_TBL1 },
	{ "mep_hash2", DRCI_REG_HASH_TBL2 },
	{ "mep_hash3", DRCI_REG_HASH_TBL3 },
	{ "mep_eui48_hi", DRCI_REG_HW_ADDR_HI },
	{ "mep_eui48_mi", DRCI_REG_HW_ADDR_MI },
	{ "mep_eui48_lo", DRCI_REG_HW_ADDR_LO },
};

static int get_stat_reg_addr(const struct regs *regs, int size,
			     const char *name, u16 *reg_addr)
{
	int i;

	for (i = 0; i < size; i++) {
		if (sysfs_streq(name, regs[i].name)) {
			*reg_addr = regs[i].reg;
			return 0;
		}
	}
	return -EINVAL;
}

#define get_static_reg_addr(regs, name, reg_addr) \
	get_stat_reg_addr(regs, ARRAY_SIZE(regs), name, reg_addr)

static ssize_t value_show(struct device *dev, struct device_attribute *attr,
			  char *buf)
{
	const char *name = attr->attr.name;
	struct most_dci_obj *dci_obj = to_dci_obj(dev);
	u16 val;
	u16 reg_addr;
	int err;

	if (sysfs_streq(name, "arb_address"))
		return sysfs_emit(buf, "%04x\n", dci_obj->reg_addr);

	if (sysfs_streq(name, "arb_value"))
		reg_addr = dci_obj->reg_addr;
	else if (get_static_reg_addr(ro_regs, name, &reg_addr) &&
		 get_static_reg_addr(rw_regs, name, &reg_addr))
		return -EINVAL;

	err = drci_rd_reg(dci_obj->usb_device, reg_addr, &val);
	if (err < 0)
		return err;

	return sysfs_emit(buf, "%04x\n", val);
}

static ssize_t value_store(struct device *dev, struct device_attribute *attr,
			   const char *buf, size_t count)
{
	u16 val;
	u16 reg_addr;
	const char *name = attr->attr.name;
	struct most_dci_obj *dci_obj = to_dci_obj(dev);
	struct usb_device *usb_dev = dci_obj->usb_device;
	int err;

Annotation

Implementation Notes