static void wf_fcu_lookup_fans()

in windfarm_fcu_controls.c [400:478]

• 65 lines of code
• 12 McCabe index (conditional complexity)

static void wf_fcu_lookup_fans(struct wf_fcu_priv *pv)
{
	/* Translation of device-tree location properties to
	 * windfarm fan names
	 */
	static const struct {
		const char *dt_name;	/* Device-tree name */
		const char *ct_name;	/* Control name */
	} loc_trans[] = {
		{ "BACKSIDE",		"backside-fan",		},
		{ "SYS CTRLR FAN",	"backside-fan",		},
		{ "DRIVE BAY",		"drive-bay-fan",	},
		{ "SLOT",		"slots-fan",		},
		{ "PCI FAN",		"slots-fan",		},
		{ "CPU A INTAKE",	"cpu-front-fan-0",	},
		{ "CPU A EXHAUST",	"cpu-rear-fan-0",	},
		{ "CPU B INTAKE",	"cpu-front-fan-1",	},
		{ "CPU B EXHAUST",	"cpu-rear-fan-1",	},
		{ "CPU A PUMP",		"cpu-pump-0",		},
		{ "CPU B PUMP",		"cpu-pump-1",		},
		{ "CPU A 1",		"cpu-fan-a-0",		},
		{ "CPU A 2",		"cpu-fan-b-0",		},
		{ "CPU A 3",		"cpu-fan-c-0",		},
		{ "CPU B 1",		"cpu-fan-a-1",		},
		{ "CPU B 2",		"cpu-fan-b-1",		},
		{ "CPU B 3",		"cpu-fan-c-1",		},
	};
	struct device_node *np, *fcu = pv->i2c->dev.of_node;
	int i;

	DBG("Looking up FCU controls in device-tree...\n");

	for_each_child_of_node(fcu, np) {
		int id, type = -1;
		const char *loc;
		const char *name;
		const u32 *reg;

		DBG(" control: %pOFn, type: %s\n", np, of_node_get_device_type(np));

		/* Detect control type */
		if (of_node_is_type(np, "fan-rpm-control") ||
		    of_node_is_type(np, "fan-rpm"))
			type = FCU_FAN_RPM;
		if (of_node_is_type(np, "fan-pwm-control") ||
		    of_node_is_type(np, "fan-pwm"))
			type = FCU_FAN_PWM;
		/* Only care about fans for now */
		if (type == -1)
			continue;

		/* Lookup for a matching location */
		loc = of_get_property(np, "location", NULL);
		reg = of_get_property(np, "reg", NULL);
		if (loc == NULL || reg == NULL)
			continue;
		DBG(" matching location: %s, reg: 0x%08x\n", loc, *reg);

		for (i = 0; i < ARRAY_SIZE(loc_trans); i++) {
			if (strncmp(loc, loc_trans[i].dt_name,
				    strlen(loc_trans[i].dt_name)))
				continue;
			name = loc_trans[i].ct_name;

			DBG(" location match, name: %s\n", name);

			if (type == FCU_FAN_RPM)
				id = ((*reg) - 0x10) / 2;
			else
				id = ((*reg) - 0x30) / 2;
			if (id > 7) {
				pr_warn("wf_fcu: Can't parse fan ID in device-tree for %pOF\n", np);
				break;
			}
			wf_fcu_add_fan(pv, name, type, id);
			break;
		}
	}
}