--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Generic Loongson processor based LAPTOP/ALL-IN-ONE driver
+ *
+ * Jianmin Lv <lvjianmin@loongson.cn>
+ * Huacai Chen <chenhuacai@loongson.cn>
+ *
+ * Copyright (C) 2022 Loongson Technology Corporation Limited
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/acpi.h>
+#include <linux/backlight.h>
+#include <linux/device.h>
+#include <linux/input.h>
+#include <linux/input/sparse-keymap.h>
+#include <linux/platform_device.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <acpi/video.h>
+
+/* 1. Driver-wide structs and misc. variables */
+
+/* ACPI HIDs */
+#define LOONGSON_ACPI_EC_HID "PNP0C09"
+#define LOONGSON_ACPI_HKEY_HID "LOON0000"
+
+#define ACPI_LAPTOP_NAME "loongson-laptop"
+#define ACPI_LAPTOP_ACPI_EVENT_PREFIX "loongson"
+
+#define MAX_ACPI_ARGS 3
+#define GENERIC_HOTKEY_MAP_MAX 64
+
+#define GENERIC_EVENT_TYPE_OFF 12
+#define GENERIC_EVENT_TYPE_MASK 0xF000
+#define GENERIC_EVENT_CODE_MASK 0x0FFF
+
+struct generic_sub_driver {
+ u32 type;
+ char *name;
+ acpi_handle *handle;
+ struct acpi_device *device;
+ struct platform_driver *driver;
+ int (*init)(struct generic_sub_driver *sub_driver);
+ void (*notify)(struct generic_sub_driver *sub_driver, u32 event);
+ u8 acpi_notify_installed;
+};
+
+static u32 input_device_registered;
+static struct input_dev *generic_inputdev;
+
+static acpi_handle hotkey_handle;
+static struct key_entry hotkey_keycode_map[GENERIC_HOTKEY_MAP_MAX];
+
+int loongson_laptop_turn_on_backlight(void);
+int loongson_laptop_turn_off_backlight(void);
+static int loongson_laptop_backlight_update(struct backlight_device *bd);
+
+/* 2. ACPI Helpers and device model */
+
+static int acpi_evalf(acpi_handle handle, int *res, char *method, char *fmt, ...)
+{
+ char res_type;
+ char *fmt0 = fmt;
+ va_list ap;
+ int success, quiet;
+ acpi_status status;
+ struct acpi_object_list params;
+ struct acpi_buffer result, *resultp;
+ union acpi_object in_objs[MAX_ACPI_ARGS], out_obj;
+
+ if (!*fmt) {
+ pr_err("acpi_evalf() called with empty format\n");
+ return 0;
+ }
+
+ if (*fmt == 'q') {
+ quiet = 1;
+ fmt++;
+ } else
+ quiet = 0;
+
+ res_type = *(fmt++);
+
+ params.count = 0;
+ params.pointer = &in_objs[0];
+
+ va_start(ap, fmt);
+ while (*fmt) {
+ char c = *(fmt++);
+ switch (c) {
+ case 'd': /* int */
+ in_objs[params.count].integer.value = va_arg(ap, int);
+ in_objs[params.count++].type = ACPI_TYPE_INTEGER;
+ break;
+ /* add more types as needed */
+ default:
+ pr_err("acpi_evalf() called with invalid format character '%c'\n", c);
+ va_end(ap);
+ return 0;
+ }
+ }
+ va_end(ap);
+
+ if (res_type != 'v') {
+ result.length = sizeof(out_obj);
+ result.pointer = &out_obj;
+ resultp = &result;
+ } else
+ resultp = NULL;
+
+ status = acpi_evaluate_object(handle, method, ¶ms, resultp);
+
+ switch (res_type) {
+ case 'd': /* int */
+ success = (status == AE_OK && out_obj.type == ACPI_TYPE_INTEGER);
+ if (success && res)
+ *res = out_obj.integer.value;
+ break;
+ case 'v': /* void */
+ success = status == AE_OK;
+ break;
+ /* add more types as needed */
+ default:
+ pr_err("acpi_evalf() called with invalid format character '%c'\n", res_type);
+ return 0;
+ }
+
+ if (!success && !quiet)
+ pr_err("acpi_evalf(%s, %s, ...) failed: %s\n",
+ method, fmt0, acpi_format_exception(status));
+
+ return success;
+}
+
+static int hotkey_status_get(int *status)
+{
+ if (!acpi_evalf(hotkey_handle, status, "GSWS", "d"))
+ return -EIO;
+
+ return 0;
+}
+
+static void dispatch_acpi_notify(acpi_handle handle, u32 event, void *data)
+{
+ struct generic_sub_driver *sub_driver = data;
+
+ if (!sub_driver || !sub_driver->notify)
+ return;
+ sub_driver->notify(sub_driver, event);
+}
+
+static int __init setup_acpi_notify(struct generic_sub_driver *sub_driver)
+{
+ acpi_status status;
+
+ if (!*sub_driver->handle)
+ return 0;
+
+ sub_driver->device = acpi_fetch_acpi_dev(*sub_driver->handle);
+ if (!sub_driver->device) {
+ pr_err("acpi_fetch_acpi_dev(%s) failed\n", sub_driver->name);
+ return -ENODEV;
+ }
+
+ sub_driver->device->driver_data = sub_driver;
+ sprintf(acpi_device_class(sub_driver->device), "%s/%s",
+ ACPI_LAPTOP_ACPI_EVENT_PREFIX, sub_driver->name);
+
+ status = acpi_install_notify_handler(*sub_driver->handle,
+ sub_driver->type, dispatch_acpi_notify, sub_driver);
+ if (ACPI_FAILURE(status)) {
+ if (status == AE_ALREADY_EXISTS) {
+ pr_notice("Another device driver is already "
+ "handling %s events\n", sub_driver->name);
+ } else {
+ pr_err("acpi_install_notify_handler(%s) failed: %s\n",
+ sub_driver->name, acpi_format_exception(status));
+ }
+ return -ENODEV;
+ }
+ sub_driver->acpi_notify_installed = 1;
+
+ return 0;
+}
+
+static int loongson_hotkey_suspend(struct device *dev)
+{
+ return 0;
+}
+
+static int loongson_hotkey_resume(struct device *dev)
+{
+ int status = 0;
+ struct key_entry ke;
+ struct backlight_device *bd;
+
+ /*
+ * Only if the firmware supports SW_LID event model, we can handle the
+ * event. This is for the consideration of development board without EC.
+ */
+ if (test_bit(SW_LID, generic_inputdev->swbit)) {
+ if (hotkey_status_get(&status) < 0)
+ return -EIO;
+ /*
+ * The input device sw element records the last lid status.
+ * When the system is awakened by other wake-up sources,
+ * the lid event will also be reported. The judgment of
+ * adding SW_LID bit which in sw element can avoid this
+ * case.
+ *
+ * Input system will drop lid event when current lid event
+ * value and last lid status in the same. So laptop driver
+ * doesn't report repeated events.
+ *
+ * Lid status is generally 0, but hardware exception is
+ * considered. So add lid status confirmation.
+ */
+ if (test_bit(SW_LID, generic_inputdev->sw) && !(status & (1 << SW_LID))) {
+ ke.type = KE_SW;
+ ke.sw.value = (u8)status;
+ ke.sw.code = SW_LID;
+ sparse_keymap_report_entry(generic_inputdev, &ke, 1, true);
+ }
+ }
+
+ bd = backlight_device_get_by_type(BACKLIGHT_PLATFORM);
+ if (bd) {
+ loongson_laptop_backlight_update(bd) ?
+ pr_warn("Loongson_backlight: resume brightness failed") :
+ pr_info("Loongson_backlight: resume brightness %d\n", bd->props.brightness);
+ }
+
+ return 0;
+}
+
+static DEFINE_SIMPLE_DEV_PM_OPS(loongson_hotkey_pm,
+ loongson_hotkey_suspend, loongson_hotkey_resume);
+
+static int loongson_hotkey_probe(struct platform_device *pdev)
+{
+ hotkey_handle = ACPI_HANDLE(&pdev->dev);
+
+ if (!hotkey_handle)
+ return -ENODEV;
+
+ return 0;
+}
+
+static const struct acpi_device_id loongson_device_ids[] = {
+ {LOONGSON_ACPI_HKEY_HID, 0},
+ {"", 0},
+};
+MODULE_DEVICE_TABLE(acpi, loongson_device_ids);
+
+static struct platform_driver loongson_hotkey_driver = {
+ .probe = loongson_hotkey_probe,
+ .driver = {
+ .name = "loongson-hotkey",
+ .owner = THIS_MODULE,
+ .pm = pm_ptr(&loongson_hotkey_pm),
+ .acpi_match_table = loongson_device_ids,
+ },
+};
+
+static int hotkey_map(void)
+{
+ u32 index;
+ acpi_status status;
+ struct acpi_buffer buf;
+ union acpi_object *pack;
+
+ buf.length = ACPI_ALLOCATE_BUFFER;
+ status = acpi_evaluate_object_typed(hotkey_handle, "KMAP", NULL, &buf, ACPI_TYPE_PACKAGE);
+ if (status != AE_OK) {
+ pr_err("ACPI exception: %s\n", acpi_format_exception(status));
+ return -1;
+ }
+ pack = buf.pointer;
+ for (index = 0; index < pack->package.count; index++) {
+ union acpi_object *element, *sub_pack;
+
+ sub_pack = &pack->package.elements[index];
+
+ element = &sub_pack->package.elements[0];
+ hotkey_keycode_map[index].type = element->integer.value;
+ element = &sub_pack->package.elements[1];
+ hotkey_keycode_map[index].code = element->integer.value;
+ element = &sub_pack->package.elements[2];
+ hotkey_keycode_map[index].keycode = element->integer.value;
+ }
+
+ return 0;
+}
+
+static int hotkey_backlight_set(bool enable)
+{
+ if (!acpi_evalf(hotkey_handle, NULL, "VCBL", "vd", enable ? 1 : 0))
+ return -EIO;
+
+ return 0;
+}
+
+static int ec_get_brightness(void)
+{
+ int status = 0;
+
+ if (!hotkey_handle)
+ return -ENXIO;
+
+ if (!acpi_evalf(hotkey_handle, &status, "ECBG", "d"))
+ return -EIO;
+
+ return status;
+}
+
+static int ec_set_brightness(int level)
+{
+
+ int ret = 0;
+
+ if (!hotkey_handle)
+ return -ENXIO;
+
+ if (!acpi_evalf(hotkey_handle, NULL, "ECBS", "vd", level))
+ ret = -EIO;
+
+ return ret;
+}
+
+static int ec_backlight_level(u8 level)
+{
+ int status = 0;
+
+ if (!hotkey_handle)
+ return -ENXIO;
+
+ if (!acpi_evalf(hotkey_handle, &status, "ECLL", "d"))
+ return -EIO;
+
+ if ((status < 0) || (level > status))
+ return status;
+
+ if (!acpi_evalf(hotkey_handle, &status, "ECSL", "d"))
+ return -EIO;
+
+ if ((status < 0) || (level < status))
+ return status;
+
+ return level;
+}
+
+static int loongson_laptop_backlight_update(struct backlight_device *bd)
+{
+ int lvl = ec_backlight_level(bd->props.brightness);
+
+ if (lvl < 0)
+ return -EIO;
+ if (ec_set_brightness(lvl))
+ return -EIO;
+
+ return 0;
+}
+
+static int loongson_laptop_get_brightness(struct backlight_device *bd)
+{
+ int level;
+
+ level = ec_get_brightness();
+ if (level < 0)
+ return -EIO;
+
+ return level;
+}
+
+static const struct backlight_ops backlight_laptop_ops = {
+ .update_status = loongson_laptop_backlight_update,
+ .get_brightness = loongson_laptop_get_brightness,
+};
+
+static int laptop_backlight_register(void)
+{
+ int status = 0;
+ struct backlight_properties props;
+
+ memset(&props, 0, sizeof(props));
+
+ if (!acpi_evalf(hotkey_handle, &status, "ECLL", "d"))
+ return -EIO;
+
+ props.brightness = 1;
+ props.max_brightness = status;
+ props.type = BACKLIGHT_PLATFORM;
+
+ backlight_device_register("loongson_laptop",
+ NULL, NULL, &backlight_laptop_ops, &props);
+
+ return 0;
+}
+
+int loongson_laptop_turn_on_backlight(void)
+{
+ int status;
+ union acpi_object arg0 = { ACPI_TYPE_INTEGER };
+ struct acpi_object_list args = { 1, &arg0 };
+
+ arg0.integer.value = 1;
+ status = acpi_evaluate_object(NULL, "\\BLSW", &args, NULL);
+ if (ACPI_FAILURE(status)) {
+ pr_info("Loongson lvds error: 0x%x\n", status);
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
+int loongson_laptop_turn_off_backlight(void)
+{
+ int status;
+ union acpi_object arg0 = { ACPI_TYPE_INTEGER };
+ struct acpi_object_list args = { 1, &arg0 };
+
+ arg0.integer.value = 0;
+ status = acpi_evaluate_object(NULL, "\\BLSW", &args, NULL);
+ if (ACPI_FAILURE(status)) {
+ pr_info("Loongson lvds error: 0x%x\n", status);
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
+static int __init event_init(struct generic_sub_driver *sub_driver)
+{
+ int ret;
+
+ ret = hotkey_map();
+ if (ret < 0) {
+ pr_err("Failed to parse keymap from DSDT\n");
+ return ret;
+ }
+
+ ret = sparse_keymap_setup(generic_inputdev, hotkey_keycode_map, NULL);
+ if (ret < 0) {
+ pr_err("Failed to setup input device keymap\n");
+ input_free_device(generic_inputdev);
+
+ return ret;
+ }
+
+ /*
+ * This hotkey driver handle backlight event when
+ * acpi_video_get_backlight_type() gets acpi_backlight_vendor
+ */
+ if (acpi_video_get_backlight_type() == acpi_backlight_vendor)
+ hotkey_backlight_set(true);
+ else
+ hotkey_backlight_set(false);
+
+ pr_info("ACPI: enabling firmware HKEY event interface...\n");
+
+ return ret;
+}
+
+static void event_notify(struct generic_sub_driver *sub_driver, u32 event)
+{
+ int type, scan_code;
+ struct key_entry *ke = NULL;
+
+ scan_code = event & GENERIC_EVENT_CODE_MASK;
+ type = (event & GENERIC_EVENT_TYPE_MASK) >> GENERIC_EVENT_TYPE_OFF;
+ ke = sparse_keymap_entry_from_scancode(generic_inputdev, scan_code);
+ if (ke) {
+ if (type == KE_SW) {
+ int status = 0;
+
+ if (hotkey_status_get(&status) < 0)
+ return;
+
+ ke->sw.value = !!(status & (1 << ke->sw.code));
+ }
+ sparse_keymap_report_entry(generic_inputdev, ke, 1, true);
+ }
+}
+
+/* 3. Infrastructure */
+
+static void generic_subdriver_exit(struct generic_sub_driver *sub_driver);
+
+static int __init generic_subdriver_init(struct generic_sub_driver *sub_driver)
+{
+ int ret;
+
+ if (!sub_driver || !sub_driver->driver)
+ return -EINVAL;
+
+ ret = platform_driver_register(sub_driver->driver);
+ if (ret)
+ return -EINVAL;
+
+ if (sub_driver->init)
+ sub_driver->init(sub_driver);
+
+ if (sub_driver->notify) {
+ ret = setup_acpi_notify(sub_driver);
+ if (ret == -ENODEV) {
+ ret = 0;
+ goto err_out;
+ }
+ if (ret < 0)
+ goto err_out;
+ }
+
+ return 0;
+
+err_out:
+ generic_subdriver_exit(sub_driver);
+ return (ret < 0) ? ret : 0;
+}
+
+static void generic_subdriver_exit(struct generic_sub_driver *sub_driver)
+{
+
+ if (sub_driver->acpi_notify_installed) {
+ acpi_remove_notify_handler(*sub_driver->handle,
+ sub_driver->type, dispatch_acpi_notify);
+ sub_driver->acpi_notify_installed = 0;
+ }
+ platform_driver_unregister(sub_driver->driver);
+}
+
+static struct generic_sub_driver generic_sub_drivers[] __refdata = {
+ {
+ .name = "hotkey",
+ .init = event_init,
+ .notify = event_notify,
+ .handle = &hotkey_handle,
+ .type = ACPI_DEVICE_NOTIFY,
+ .driver = &loongson_hotkey_driver,
+ },
+};
+
+static int __init generic_acpi_laptop_init(void)
+{
+ bool ec_found;
+ int i, ret, status;
+
+ if (acpi_disabled)
+ return -ENODEV;
+
+ /* The EC device is required */
+ ec_found = acpi_dev_found(LOONGSON_ACPI_EC_HID);
+ if (!ec_found)
+ return -ENODEV;
+
+ /* Enable SCI for EC */
+ acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1);
+
+ generic_inputdev = input_allocate_device();
+ if (!generic_inputdev) {
+ pr_err("Unable to allocate input device\n");
+ return -ENOMEM;
+ }
+
+ /* Prepare input device, but don't register */
+ generic_inputdev->name =
+ "Loongson Generic Laptop/All-in-One Extra Buttons";
+ generic_inputdev->phys = ACPI_LAPTOP_NAME "/input0";
+ generic_inputdev->id.bustype = BUS_HOST;
+ generic_inputdev->dev.parent = NULL;
+
+ /* Init subdrivers */
+ for (i = 0; i < ARRAY_SIZE(generic_sub_drivers); i++) {
+ ret = generic_subdriver_init(&generic_sub_drivers[i]);
+ if (ret < 0) {
+ input_free_device(generic_inputdev);
+ while (--i >= 0)
+ generic_subdriver_exit(&generic_sub_drivers[i]);
+ return ret;
+ }
+ }
+
+ ret = input_register_device(generic_inputdev);
+ if (ret < 0) {
+ input_free_device(generic_inputdev);
+ while (--i >= 0)
+ generic_subdriver_exit(&generic_sub_drivers[i]);
+ pr_err("Unable to register input device\n");
+ return ret;
+ }
+
+ input_device_registered = 1;
+
+ if (acpi_evalf(hotkey_handle, &status, "ECBG", "d")) {
+ pr_info("Loongson Laptop used, init brightness is 0x%x\n", status);
+ ret = laptop_backlight_register();
+ if (ret < 0)
+ pr_err("Loongson Laptop: laptop-backlight device register failed\n");
+ }
+
+ return 0;
+}
+
+static void __exit generic_acpi_laptop_exit(void)
+{
+ if (generic_inputdev) {
+ if (input_device_registered)
+ input_unregister_device(generic_inputdev);
+ else
+ input_free_device(generic_inputdev);
+ }
+}
+
+module_init(generic_acpi_laptop_init);
+module_exit(generic_acpi_laptop_exit);
+
+MODULE_AUTHOR("Jianmin Lv <lvjianmin@loongson.cn>");
+MODULE_AUTHOR("Huacai Chen <chenhuacai@loongson.cn>");
+MODULE_DESCRIPTION("Loongson Laptop/All-in-One ACPI Driver");
+MODULE_LICENSE("GPL");
projects / kernel.git / commitdiff