static void port_cap_show()

in debugfs.c [308:378]

• 62 lines of code
• 16 McCabe index (conditional complexity)

static void port_cap_show(struct tb_port *port, struct seq_file *s,
			  unsigned int cap)
{
	struct tb_cap_any header;
	u8 vsec_id = 0;
	size_t length;
	int ret;

	ret = tb_port_read(port, &header, TB_CFG_PORT, cap, 1);
	if (ret) {
		seq_printf(s, "0x%04x <capability read failed>\n", cap);
		return;
	}

	switch (header.basic.cap) {
	case TB_PORT_CAP_PHY:
		length = PORT_CAP_LANE_LEN;
		break;

	case TB_PORT_CAP_TIME1:
		length = PORT_CAP_TMU_LEN;
		break;

	case TB_PORT_CAP_POWER:
		length = PORT_CAP_POWER_LEN;
		break;

	case TB_PORT_CAP_ADAP:
		if (tb_port_is_pcie_down(port) || tb_port_is_pcie_up(port)) {
			length = PORT_CAP_PCIE_LEN;
		} else if (tb_port_is_dpin(port) || tb_port_is_dpout(port)) {
			length = PORT_CAP_DP_LEN;
		} else if (tb_port_is_usb3_down(port) ||
			   tb_port_is_usb3_up(port)) {
			length = PORT_CAP_USB3_LEN;
		} else {
			seq_printf(s, "0x%04x <unsupported capability 0x%02x>\n",
				   cap, header.basic.cap);
			return;
		}
		break;

	case TB_PORT_CAP_VSE:
		if (!header.extended_short.length) {
			ret = tb_port_read(port, (u32 *)&header + 1, TB_CFG_PORT,
					   cap + 1, 1);
			if (ret) {
				seq_printf(s, "0x%04x <capability read failed>\n",
					   cap + 1);
				return;
			}
			length = header.extended_long.length;
			vsec_id = header.extended_short.vsec_id;
		} else {
			length = header.extended_short.length;
			vsec_id = header.extended_short.vsec_id;
		}
		break;

	case TB_PORT_CAP_USB4:
		length = PORT_CAP_USB4_LEN;
		break;

	default:
		seq_printf(s, "0x%04x <unsupported capability 0x%02x>\n",
			   cap, header.basic.cap);
		return;
	}

	cap_show(s, NULL, port, cap, header.basic.cap, vsec_id, length);
}