v4.19.13 snapshot.
diff --git a/drivers/pnp/support.c b/drivers/pnp/support.c
new file mode 100644
index 0000000..e4f53d3
--- /dev/null
+++ b/drivers/pnp/support.c
@@ -0,0 +1,179 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * support.c - standard functions for the use of pnp protocol drivers
+ *
+ * Copyright 2003 Adam Belay <ambx1@neo.rr.com>
+ * Copyright (C) 2008 Hewlett-Packard Development Company, L.P.
+ * Bjorn Helgaas <bjorn.helgaas@hp.com>
+ */
+
+#include <linux/module.h>
+#include <linux/ctype.h>
+#include <linux/pnp.h>
+#include "base.h"
+
+/**
+ * pnp_is_active - Determines if a device is active based on its current
+ * resources
+ * @dev: pointer to the desired PnP device
+ */
+int pnp_is_active(struct pnp_dev *dev)
+{
+ /*
+ * I don't think this is very reliable because pnp_disable_dev()
+ * only clears out auto-assigned resources.
+ */
+ if (!pnp_port_start(dev, 0) && pnp_port_len(dev, 0) <= 1 &&
+ !pnp_mem_start(dev, 0) && pnp_mem_len(dev, 0) <= 1 &&
+ pnp_irq(dev, 0) == -1 && pnp_dma(dev, 0) == -1)
+ return 0;
+ else
+ return 1;
+}
+
+EXPORT_SYMBOL(pnp_is_active);
+
+/*
+ * Functionally similar to acpi_ex_eisa_id_to_string(), but that's
+ * buried in the ACPI CA, and we can't depend on it being present.
+ */
+void pnp_eisa_id_to_string(u32 id, char *str)
+{
+ id = be32_to_cpu(id);
+
+ /*
+ * According to the specs, the first three characters are five-bit
+ * compressed ASCII, and the left-over high order bit should be zero.
+ * However, the Linux ISAPNP code historically used six bits for the
+ * first character, and there seem to be IDs that depend on that,
+ * e.g., "nEC8241" in the Linux 8250_pnp serial driver and the
+ * FreeBSD sys/pc98/cbus/sio_cbus.c driver.
+ */
+ str[0] = 'A' + ((id >> 26) & 0x3f) - 1;
+ str[1] = 'A' + ((id >> 21) & 0x1f) - 1;
+ str[2] = 'A' + ((id >> 16) & 0x1f) - 1;
+ str[3] = hex_asc_hi(id >> 8);
+ str[4] = hex_asc_lo(id >> 8);
+ str[5] = hex_asc_hi(id);
+ str[6] = hex_asc_lo(id);
+ str[7] = '\0';
+}
+
+char *pnp_resource_type_name(struct resource *res)
+{
+ switch (pnp_resource_type(res)) {
+ case IORESOURCE_IO:
+ return "io";
+ case IORESOURCE_MEM:
+ return "mem";
+ case IORESOURCE_IRQ:
+ return "irq";
+ case IORESOURCE_DMA:
+ return "dma";
+ case IORESOURCE_BUS:
+ return "bus";
+ }
+ return "unknown";
+}
+
+void dbg_pnp_show_resources(struct pnp_dev *dev, char *desc)
+{
+ struct pnp_resource *pnp_res;
+
+ if (list_empty(&dev->resources))
+ pnp_dbg(&dev->dev, "%s: no current resources\n", desc);
+ else {
+ pnp_dbg(&dev->dev, "%s: current resources:\n", desc);
+ list_for_each_entry(pnp_res, &dev->resources, list)
+ pnp_dbg(&dev->dev, "%pr\n", &pnp_res->res);
+ }
+}
+
+char *pnp_option_priority_name(struct pnp_option *option)
+{
+ switch (pnp_option_priority(option)) {
+ case PNP_RES_PRIORITY_PREFERRED:
+ return "preferred";
+ case PNP_RES_PRIORITY_ACCEPTABLE:
+ return "acceptable";
+ case PNP_RES_PRIORITY_FUNCTIONAL:
+ return "functional";
+ }
+ return "invalid";
+}
+
+void dbg_pnp_show_option(struct pnp_dev *dev, struct pnp_option *option)
+{
+ char buf[128];
+ int len = 0, i;
+ struct pnp_port *port;
+ struct pnp_mem *mem;
+ struct pnp_irq *irq;
+ struct pnp_dma *dma;
+
+ if (pnp_option_is_dependent(option))
+ len += scnprintf(buf + len, sizeof(buf) - len,
+ " dependent set %d (%s) ",
+ pnp_option_set(option),
+ pnp_option_priority_name(option));
+ else
+ len += scnprintf(buf + len, sizeof(buf) - len,
+ " independent ");
+
+ switch (option->type) {
+ case IORESOURCE_IO:
+ port = &option->u.port;
+ len += scnprintf(buf + len, sizeof(buf) - len, "io min %#llx "
+ "max %#llx align %lld size %lld flags %#x",
+ (unsigned long long) port->min,
+ (unsigned long long) port->max,
+ (unsigned long long) port->align,
+ (unsigned long long) port->size, port->flags);
+ break;
+ case IORESOURCE_MEM:
+ mem = &option->u.mem;
+ len += scnprintf(buf + len, sizeof(buf) - len, "mem min %#llx "
+ "max %#llx align %lld size %lld flags %#x",
+ (unsigned long long) mem->min,
+ (unsigned long long) mem->max,
+ (unsigned long long) mem->align,
+ (unsigned long long) mem->size, mem->flags);
+ break;
+ case IORESOURCE_IRQ:
+ irq = &option->u.irq;
+ len += scnprintf(buf + len, sizeof(buf) - len, "irq");
+ if (bitmap_empty(irq->map.bits, PNP_IRQ_NR))
+ len += scnprintf(buf + len, sizeof(buf) - len,
+ " <none>");
+ else {
+ for (i = 0; i < PNP_IRQ_NR; i++)
+ if (test_bit(i, irq->map.bits))
+ len += scnprintf(buf + len,
+ sizeof(buf) - len,
+ " %d", i);
+ }
+ len += scnprintf(buf + len, sizeof(buf) - len, " flags %#x",
+ irq->flags);
+ if (irq->flags & IORESOURCE_IRQ_OPTIONAL)
+ len += scnprintf(buf + len, sizeof(buf) - len,
+ " (optional)");
+ break;
+ case IORESOURCE_DMA:
+ dma = &option->u.dma;
+ len += scnprintf(buf + len, sizeof(buf) - len, "dma");
+ if (!dma->map)
+ len += scnprintf(buf + len, sizeof(buf) - len,
+ " <none>");
+ else {
+ for (i = 0; i < 8; i++)
+ if (dma->map & (1 << i))
+ len += scnprintf(buf + len,
+ sizeof(buf) - len,
+ " %d", i);
+ }
+ len += scnprintf(buf + len, sizeof(buf) - len, " (bitmask %#x) "
+ "flags %#x", dma->map, dma->flags);
+ break;
+ }
+ pnp_dbg(&dev->dev, "%s\n", buf);
+}