^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Generic Event Device for ACPI.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (c) 2016, The Linux Foundation. All rights reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Generic Event Device allows platforms to handle interrupts in ACPI
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * ASL statements. It follows very similar to _EVT method approach
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * from GPIO events. All interrupts are listed in _CRS and the handler
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * is written in _EVT method. Here is an example.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) * Device (GED0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) * {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) * Name (_HID, "ACPI0013")
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) * Name (_UID, 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) * Method (_CRS, 0x0, Serialized)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) * {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) * Name (RBUF, ResourceTemplate ()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) * {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) * Interrupt(ResourceConsumer, Edge, ActiveHigh, Shared, , , )
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) * {123}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) * }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) * })
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) * Method (_EVT, 1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) * if (Lequal(123, Arg0))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) * {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) * }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) * }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) * }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) #include <linux/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) #include <linux/list.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) #include <linux/acpi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) #define MODULE_NAME "acpi-ged"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) struct acpi_ged_device {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) struct device *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) struct list_head event_list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) struct acpi_ged_event {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) struct list_head node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) struct device *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) unsigned int gsi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) unsigned int irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) acpi_handle handle;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) static irqreturn_t acpi_ged_irq_handler(int irq, void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) struct acpi_ged_event *event = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) acpi_status acpi_ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) acpi_ret = acpi_execute_simple_method(event->handle, NULL, event->gsi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) if (ACPI_FAILURE(acpi_ret))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) dev_err_once(event->dev, "IRQ method execution failed\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) return IRQ_HANDLED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) static acpi_status acpi_ged_request_interrupt(struct acpi_resource *ares,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) void *context)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) struct acpi_ged_event *event;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) unsigned int irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) unsigned int gsi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) unsigned int irqflags = IRQF_ONESHOT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) struct acpi_ged_device *geddev = context;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) struct device *dev = geddev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) acpi_handle handle = ACPI_HANDLE(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) acpi_handle evt_handle;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) struct resource r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) struct acpi_resource_irq *p = &ares->data.irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) struct acpi_resource_extended_irq *pext = &ares->data.extended_irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) char ev_name[5];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) u8 trigger;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) if (ares->type == ACPI_RESOURCE_TYPE_END_TAG)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) return AE_OK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) if (!acpi_dev_resource_interrupt(ares, 0, &r)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) dev_err(dev, "unable to parse IRQ resource\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) return AE_ERROR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) if (ares->type == ACPI_RESOURCE_TYPE_IRQ) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) gsi = p->interrupts[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) trigger = p->triggering;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) gsi = pext->interrupts[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) trigger = pext->triggering;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) irq = r.start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) switch (gsi) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) case 0 ... 255:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) sprintf(ev_name, "_%c%02X",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) trigger == ACPI_EDGE_SENSITIVE ? 'E' : 'L', gsi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) if (ACPI_SUCCESS(acpi_get_handle(handle, ev_name, &evt_handle)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) fallthrough;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) if (ACPI_SUCCESS(acpi_get_handle(handle, "_EVT", &evt_handle)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) dev_err(dev, "cannot locate _EVT method\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) return AE_ERROR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) event = devm_kzalloc(dev, sizeof(*event), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) if (!event)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) return AE_ERROR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) event->gsi = gsi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) event->dev = dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) event->irq = irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) event->handle = evt_handle;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) if (r.flags & IORESOURCE_IRQ_SHAREABLE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) irqflags |= IRQF_SHARED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) if (request_threaded_irq(irq, NULL, acpi_ged_irq_handler,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) irqflags, "ACPI:Ged", event)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) dev_err(dev, "failed to setup event handler for irq %u\n", irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) return AE_ERROR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) dev_dbg(dev, "GED listening GSI %u @ IRQ %u\n", gsi, irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) list_add_tail(&event->node, &geddev->event_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) return AE_OK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) static int ged_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) struct acpi_ged_device *geddev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) acpi_status acpi_ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) geddev = devm_kzalloc(&pdev->dev, sizeof(*geddev), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) if (!geddev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) geddev->dev = &pdev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) INIT_LIST_HEAD(&geddev->event_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) acpi_ret = acpi_walk_resources(ACPI_HANDLE(&pdev->dev), "_CRS",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) acpi_ged_request_interrupt, geddev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) if (ACPI_FAILURE(acpi_ret)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) dev_err(&pdev->dev, "unable to parse the _CRS record\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) platform_set_drvdata(pdev, geddev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) static void ged_shutdown(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) struct acpi_ged_device *geddev = platform_get_drvdata(pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) struct acpi_ged_event *event, *next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) list_for_each_entry_safe(event, next, &geddev->event_list, node) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) free_irq(event->irq, event);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) list_del(&event->node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) dev_dbg(geddev->dev, "GED releasing GSI %u @ IRQ %u\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) event->gsi, event->irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) static int ged_remove(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) ged_shutdown(pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) static const struct acpi_device_id ged_acpi_ids[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) {"ACPI0013"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) {},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) static struct platform_driver ged_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) .probe = ged_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) .remove = ged_remove,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) .shutdown = ged_shutdown,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) .name = MODULE_NAME,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) .acpi_match_table = ACPI_PTR(ged_acpi_ids),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) builtin_platform_driver(ged_driver);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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