// 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); }