static ssize_t resources_store()

in interface.c [336:438]

• 99 lines of code
• 21 McCabe index (conditional complexity)

static ssize_t resources_store(struct device *dmdev,
			       struct device_attribute *attr, const char *ubuf,
			       size_t count)
{
	struct pnp_dev *dev = to_pnp_dev(dmdev);
	char *buf = (void *)ubuf;
	int retval = 0;

	if (dev->status & PNP_ATTACHED) {
		retval = -EBUSY;
		dev_info(&dev->dev, "in use; can't configure\n");
		goto done;
	}

	buf = skip_spaces(buf);
	if (!strncasecmp(buf, "disable", 7)) {
		retval = pnp_disable_dev(dev);
		goto done;
	}
	if (!strncasecmp(buf, "activate", 8)) {
		retval = pnp_activate_dev(dev);
		goto done;
	}
	if (!strncasecmp(buf, "fill", 4)) {
		if (dev->active)
			goto done;
		retval = pnp_auto_config_dev(dev);
		goto done;
	}
	if (!strncasecmp(buf, "auto", 4)) {
		if (dev->active)
			goto done;
		pnp_init_resources(dev);
		retval = pnp_auto_config_dev(dev);
		goto done;
	}
	if (!strncasecmp(buf, "clear", 5)) {
		if (dev->active)
			goto done;
		pnp_init_resources(dev);
		goto done;
	}
	if (!strncasecmp(buf, "get", 3)) {
		mutex_lock(&pnp_res_mutex);
		if (pnp_can_read(dev))
			dev->protocol->get(dev);
		mutex_unlock(&pnp_res_mutex);
		goto done;
	}
	if (!strncasecmp(buf, "set", 3)) {
		resource_size_t start;
		resource_size_t end;
		unsigned long flags;

		if (dev->active)
			goto done;
		buf += 3;
		pnp_init_resources(dev);
		mutex_lock(&pnp_res_mutex);
		while (1) {
			buf = skip_spaces(buf);
			if (!strncasecmp(buf, "io", 2)) {
				buf = pnp_get_resource_value(buf + 2,
							     IORESOURCE_IO,
							     &start, &end,
							     &flags);
				pnp_add_io_resource(dev, start, end, flags);
			} else if (!strncasecmp(buf, "mem", 3)) {
				buf = pnp_get_resource_value(buf + 3,
							     IORESOURCE_MEM,
							     &start, &end,
							     &flags);
				pnp_add_mem_resource(dev, start, end, flags);
			} else if (!strncasecmp(buf, "irq", 3)) {
				buf = pnp_get_resource_value(buf + 3,
							     IORESOURCE_IRQ,
							     &start, NULL,
							     &flags);
				pnp_add_irq_resource(dev, start, flags);
			} else if (!strncasecmp(buf, "dma", 3)) {
				buf = pnp_get_resource_value(buf + 3,
							     IORESOURCE_DMA,
							     &start, NULL,
							     &flags);
				pnp_add_dma_resource(dev, start, flags);
			} else if (!strncasecmp(buf, "bus", 3)) {
				buf = pnp_get_resource_value(buf + 3,
							     IORESOURCE_BUS,
							     &start, &end,
							     NULL);
				pnp_add_bus_resource(dev, start, end);
			} else
				break;
		}
		mutex_unlock(&pnp_res_mutex);
		goto done;
	}

done:
	if (retval < 0)
		return retval;
	return count;
}