288 строки
5.9 KiB
C
288 строки
5.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Driver for the LID cover switch of the Surface 3
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*
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* Copyright (c) 2016 Red Hat Inc.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/acpi.h>
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#include <linux/dmi.h>
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#include <linux/input.h>
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#include <linux/mutex.h>
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#include <linux/platform_device.h>
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#include <linux/spi/spi.h>
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MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@redhat.com>");
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MODULE_DESCRIPTION("Surface 3 platform driver");
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MODULE_LICENSE("GPL");
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#define ACPI_BUTTON_HID_LID "PNP0C0D"
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#define SPI_CTL_OBJ_NAME "SPI"
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#define SPI_TS_OBJ_NAME "NTRG"
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#define SURFACE3_LID_GUID "F7CC25EC-D20B-404C-8903-0ED4359C18AE"
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MODULE_ALIAS("wmi:" SURFACE3_LID_GUID);
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static const struct dmi_system_id surface3_dmi_table[] = {
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#if defined(CONFIG_X86)
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{
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
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DMI_MATCH(DMI_PRODUCT_NAME, "Surface 3"),
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},
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},
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#endif
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{ }
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};
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struct surface3_wmi {
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struct acpi_device *touchscreen_adev;
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struct acpi_device *pnp0c0d_adev;
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struct acpi_hotplug_context hp;
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struct input_dev *input;
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};
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static struct platform_device *s3_wmi_pdev;
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static struct surface3_wmi s3_wmi;
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static DEFINE_MUTEX(s3_wmi_lock);
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static int s3_wmi_query_block(const char *guid, int instance, int *ret)
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{
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struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
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union acpi_object *obj = NULL;
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acpi_status status;
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int error = 0;
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mutex_lock(&s3_wmi_lock);
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status = wmi_query_block(guid, instance, &output);
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if (ACPI_FAILURE(status)) {
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error = -EIO;
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goto out_free_unlock;
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}
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obj = output.pointer;
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if (!obj || obj->type != ACPI_TYPE_INTEGER) {
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if (obj) {
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pr_err("query block returned object type: %d - buffer length:%d\n",
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obj->type,
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obj->type == ACPI_TYPE_BUFFER ?
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obj->buffer.length : 0);
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}
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error = -EINVAL;
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goto out_free_unlock;
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}
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*ret = obj->integer.value;
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out_free_unlock:
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kfree(obj);
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mutex_unlock(&s3_wmi_lock);
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return error;
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}
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static inline int s3_wmi_query_lid(int *ret)
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{
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return s3_wmi_query_block(SURFACE3_LID_GUID, 0, ret);
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}
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static int s3_wmi_send_lid_state(void)
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{
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int ret, lid_sw;
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ret = s3_wmi_query_lid(&lid_sw);
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if (ret)
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return ret;
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input_report_switch(s3_wmi.input, SW_LID, lid_sw);
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input_sync(s3_wmi.input);
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return 0;
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}
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static int s3_wmi_hp_notify(struct acpi_device *adev, u32 value)
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{
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return s3_wmi_send_lid_state();
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}
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static acpi_status s3_wmi_attach_spi_device(acpi_handle handle,
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u32 level,
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void *data,
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void **return_value)
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{
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struct acpi_device *adev = acpi_fetch_acpi_dev(handle);
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struct acpi_device **ts_adev = data;
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if (!adev || strncmp(acpi_device_bid(adev), SPI_TS_OBJ_NAME,
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strlen(SPI_TS_OBJ_NAME)))
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return AE_OK;
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if (*ts_adev) {
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pr_err("duplicate entry %s\n", SPI_TS_OBJ_NAME);
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return AE_OK;
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}
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*ts_adev = adev;
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return AE_OK;
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}
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static int s3_wmi_check_platform_device(struct device *dev, void *data)
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{
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struct acpi_device *adev = ACPI_COMPANION(dev);
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struct acpi_device *ts_adev = NULL;
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acpi_status status;
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/* ignore non ACPI devices */
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if (!adev)
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return 0;
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/* check for LID ACPI switch */
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if (!strcmp(ACPI_BUTTON_HID_LID, acpi_device_hid(adev))) {
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s3_wmi.pnp0c0d_adev = adev;
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return 0;
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}
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/* ignore non SPI controllers */
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if (strncmp(acpi_device_bid(adev), SPI_CTL_OBJ_NAME,
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strlen(SPI_CTL_OBJ_NAME)))
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return 0;
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status = acpi_walk_namespace(ACPI_TYPE_DEVICE, adev->handle, 1,
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s3_wmi_attach_spi_device, NULL,
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&ts_adev, NULL);
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if (ACPI_FAILURE(status))
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dev_warn(dev, "failed to enumerate SPI slaves\n");
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if (!ts_adev)
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return 0;
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s3_wmi.touchscreen_adev = ts_adev;
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return 0;
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}
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static int s3_wmi_create_and_register_input(struct platform_device *pdev)
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{
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struct input_dev *input;
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int error;
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input = devm_input_allocate_device(&pdev->dev);
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if (!input)
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return -ENOMEM;
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input->name = "Lid Switch";
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input->phys = "button/input0";
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input->id.bustype = BUS_HOST;
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input->id.product = 0x0005;
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input_set_capability(input, EV_SW, SW_LID);
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error = input_register_device(input);
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if (error)
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return error;
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s3_wmi.input = input;
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return 0;
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}
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static int __init s3_wmi_probe(struct platform_device *pdev)
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{
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int error;
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if (!dmi_check_system(surface3_dmi_table))
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return -ENODEV;
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memset(&s3_wmi, 0, sizeof(s3_wmi));
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bus_for_each_dev(&platform_bus_type, NULL, NULL,
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s3_wmi_check_platform_device);
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if (!s3_wmi.touchscreen_adev)
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return -ENODEV;
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acpi_bus_trim(s3_wmi.pnp0c0d_adev);
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error = s3_wmi_create_and_register_input(pdev);
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if (error)
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goto restore_acpi_lid;
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acpi_initialize_hp_context(s3_wmi.touchscreen_adev, &s3_wmi.hp,
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s3_wmi_hp_notify, NULL);
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s3_wmi_send_lid_state();
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return 0;
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restore_acpi_lid:
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acpi_bus_scan(s3_wmi.pnp0c0d_adev->handle);
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return error;
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}
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static int s3_wmi_remove(struct platform_device *device)
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{
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/* remove the hotplug context from the acpi device */
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s3_wmi.touchscreen_adev->hp = NULL;
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/* reinstall the actual PNPC0C0D LID default handle */
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acpi_bus_scan(s3_wmi.pnp0c0d_adev->handle);
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return 0;
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}
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static int __maybe_unused s3_wmi_resume(struct device *dev)
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{
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s3_wmi_send_lid_state();
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return 0;
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}
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static SIMPLE_DEV_PM_OPS(s3_wmi_pm, NULL, s3_wmi_resume);
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static struct platform_driver s3_wmi_driver = {
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.driver = {
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.name = "surface3-wmi",
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.pm = &s3_wmi_pm,
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},
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.remove = s3_wmi_remove,
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};
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static int __init s3_wmi_init(void)
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{
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int error;
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s3_wmi_pdev = platform_device_alloc("surface3-wmi", -1);
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if (!s3_wmi_pdev)
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return -ENOMEM;
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error = platform_device_add(s3_wmi_pdev);
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if (error)
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goto err_device_put;
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error = platform_driver_probe(&s3_wmi_driver, s3_wmi_probe);
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if (error)
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goto err_device_del;
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pr_info("Surface 3 WMI Extras loaded\n");
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return 0;
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err_device_del:
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platform_device_del(s3_wmi_pdev);
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err_device_put:
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platform_device_put(s3_wmi_pdev);
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return error;
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}
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static void __exit s3_wmi_exit(void)
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{
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platform_device_unregister(s3_wmi_pdev);
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platform_driver_unregister(&s3_wmi_driver);
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}
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module_init(s3_wmi_init);
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module_exit(s3_wmi_exit);
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