^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) * WMI methods for use with dell-smbios
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (c) 2017 Dell Inc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/dmi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/list.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/mutex.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/wmi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include "dell-smbios.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include "dell-wmi-descriptor.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) static DEFINE_MUTEX(call_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) static DEFINE_MUTEX(list_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) static int wmi_supported;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) struct misc_bios_flags_structure {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) struct dmi_header header;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) u16 flags0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) } __packed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #define FLAG_HAS_ACPI_WMI 0x02
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #define DELL_WMI_SMBIOS_GUID "A80593CE-A997-11DA-B012-B622A1EF5492"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) struct wmi_smbios_priv {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) struct dell_wmi_smbios_buffer *buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) struct list_head list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) struct wmi_device *wdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) struct device *child;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) u32 req_buf_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) static LIST_HEAD(wmi_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) static inline struct wmi_smbios_priv *get_first_smbios_priv(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) return list_first_entry_or_null(&wmi_list,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) struct wmi_smbios_priv,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) static int run_smbios_call(struct wmi_device *wdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) struct wmi_smbios_priv *priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) struct acpi_buffer input;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) union acpi_object *obj;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) acpi_status status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) priv = dev_get_drvdata(&wdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) input.length = priv->req_buf_size - sizeof(u64);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) input.pointer = &priv->buf->std;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) dev_dbg(&wdev->dev, "evaluating: %u/%u [%x,%x,%x,%x]\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) priv->buf->std.cmd_class, priv->buf->std.cmd_select,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) priv->buf->std.input[0], priv->buf->std.input[1],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) priv->buf->std.input[2], priv->buf->std.input[3]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) status = wmidev_evaluate_method(wdev, 0, 1, &input, &output);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) if (ACPI_FAILURE(status))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) obj = (union acpi_object *)output.pointer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) if (obj->type != ACPI_TYPE_BUFFER) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) dev_dbg(&wdev->dev, "received type: %d\n", obj->type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) if (obj->type == ACPI_TYPE_INTEGER)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) dev_dbg(&wdev->dev, "SMBIOS call failed: %llu\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) obj->integer.value);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) kfree(output.pointer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) memcpy(&priv->buf->std, obj->buffer.pointer, obj->buffer.length);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) dev_dbg(&wdev->dev, "result: [%08x,%08x,%08x,%08x]\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) priv->buf->std.output[0], priv->buf->std.output[1],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) priv->buf->std.output[2], priv->buf->std.output[3]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) kfree(output.pointer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) static int dell_smbios_wmi_call(struct calling_interface_buffer *buffer)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) struct wmi_smbios_priv *priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) size_t difference;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) size_t size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) mutex_lock(&call_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) priv = get_first_smbios_priv();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) if (!priv) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) ret = -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) goto out_wmi_call;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) size = sizeof(struct calling_interface_buffer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) difference = priv->req_buf_size - sizeof(u64) - size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) memset(&priv->buf->ext, 0, difference);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) memcpy(&priv->buf->std, buffer, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) ret = run_smbios_call(priv->wdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) memcpy(buffer, &priv->buf->std, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) out_wmi_call:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) mutex_unlock(&call_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) static long dell_smbios_wmi_filter(struct wmi_device *wdev, unsigned int cmd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) struct wmi_ioctl_buffer *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) struct wmi_smbios_priv *priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) switch (cmd) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) case DELL_WMI_SMBIOS_CMD:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) mutex_lock(&call_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) priv = dev_get_drvdata(&wdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) if (!priv) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) ret = -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) goto fail_smbios_cmd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) memcpy(priv->buf, arg, priv->req_buf_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) if (dell_smbios_call_filter(&wdev->dev, &priv->buf->std)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) dev_err(&wdev->dev, "Invalid call %d/%d:%8x\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) priv->buf->std.cmd_class,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) priv->buf->std.cmd_select,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) priv->buf->std.input[0]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) ret = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) goto fail_smbios_cmd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) ret = run_smbios_call(priv->wdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) goto fail_smbios_cmd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) memcpy(arg, priv->buf, priv->req_buf_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) fail_smbios_cmd:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) mutex_unlock(&call_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) ret = -ENOIOCTLCMD;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) static int dell_smbios_wmi_probe(struct wmi_device *wdev, const void *context)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) struct wmi_driver *wdriver =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) container_of(wdev->dev.driver, struct wmi_driver, driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) struct wmi_smbios_priv *priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) u32 hotfix;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) int count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) ret = dell_wmi_get_descriptor_valid();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) priv = devm_kzalloc(&wdev->dev, sizeof(struct wmi_smbios_priv),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) if (!priv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) /* WMI buffer size will be either 4k or 32k depending on machine */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) if (!dell_wmi_get_size(&priv->req_buf_size))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) return -EPROBE_DEFER;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) /* some SMBIOS calls fail unless BIOS contains hotfix */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) if (!dell_wmi_get_hotfix(&hotfix))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) return -EPROBE_DEFER;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) if (!hotfix) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) dev_warn(&wdev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) "WMI SMBIOS userspace interface not supported(%u), try upgrading to a newer BIOS\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) hotfix);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) wdriver->filter_callback = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) /* add in the length object we will use internally with ioctl */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) priv->req_buf_size += sizeof(u64);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) ret = set_required_buffer_size(wdev, priv->req_buf_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) count = get_order(priv->req_buf_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) priv->buf = (void *)__get_free_pages(GFP_KERNEL, count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) if (!priv->buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) /* ID is used by dell-smbios to set priority of drivers */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) wdev->dev.id = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) ret = dell_smbios_register_device(&wdev->dev, &dell_smbios_wmi_call);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) goto fail_register;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) priv->wdev = wdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) dev_set_drvdata(&wdev->dev, priv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) mutex_lock(&list_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) list_add_tail(&priv->list, &wmi_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) mutex_unlock(&list_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) fail_register:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) free_pages((unsigned long)priv->buf, count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) static int dell_smbios_wmi_remove(struct wmi_device *wdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) struct wmi_smbios_priv *priv = dev_get_drvdata(&wdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) int count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) mutex_lock(&call_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) mutex_lock(&list_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) list_del(&priv->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) mutex_unlock(&list_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) dell_smbios_unregister_device(&wdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) count = get_order(priv->req_buf_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) free_pages((unsigned long)priv->buf, count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) mutex_unlock(&call_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) static const struct wmi_device_id dell_smbios_wmi_id_table[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) { .guid_string = DELL_WMI_SMBIOS_GUID },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) { },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) static void parse_b1_table(const struct dmi_header *dm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) struct misc_bios_flags_structure *flags =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) container_of(dm, struct misc_bios_flags_structure, header);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) /* 4 bytes header, 8 bytes flags */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) if (dm->length < 12)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) if (dm->handle != 0xb100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) if ((flags->flags0 & FLAG_HAS_ACPI_WMI))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) wmi_supported = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) static void find_b1(const struct dmi_header *dm, void *dummy)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) switch (dm->type) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) case 0xb1: /* misc bios flags */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) parse_b1_table(dm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) static struct wmi_driver dell_smbios_wmi_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) .name = "dell-smbios",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) .probe = dell_smbios_wmi_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) .remove = dell_smbios_wmi_remove,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) .id_table = dell_smbios_wmi_id_table,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) .filter_callback = dell_smbios_wmi_filter,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) int init_dell_smbios_wmi(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) dmi_walk(find_b1, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) if (!wmi_supported)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) return wmi_driver_register(&dell_smbios_wmi_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) void exit_dell_smbios_wmi(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) if (wmi_supported)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) wmi_driver_unregister(&dell_smbios_wmi_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) MODULE_DEVICE_TABLE(wmi, dell_smbios_wmi_id_table);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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