On Thu, Aug 18, 2022 at 6:23 AM Huacai Chen <chenhuacai@xxxxxxxxxxx> wrote:
>
> From: Jianmin Lv <lvjianmin@xxxxxxxxxxx>
>
> This add ACPI-based generic laptop driver for Loongson-3. Some of the
> codes are derived from drivers/platform/x86/thinkpad_acpi.c.
>
> Signed-off-by: Jianmin Lv <lvjianmin@xxxxxxxxxxx>
> Signed-off-by: Huacai Chen <chenhuacai@xxxxxxxxxxx>
> ---
> V2: Fix problems pointed out by Arnd.
>
> drivers/platform/loongarch/Kconfig | 12 +
> drivers/platform/loongarch/Makefile | 1 +
> drivers/platform/loongarch/generic-laptop.c | 747 ++++++++++++++++++++
> 3 files changed, 760 insertions(+)
> create mode 100644 drivers/platform/loongarch/generic-laptop.c
>
> diff --git a/drivers/platform/loongarch/Kconfig b/drivers/platform/loongarch/Kconfig
> index a1542843b0ad..61ed83227d36 100644
> --- a/drivers/platform/loongarch/Kconfig
> +++ b/drivers/platform/loongarch/Kconfig
> @@ -23,4 +23,16 @@ config CPU_HWMON
> help
> Loongson-3A/3B/3C CPU HWMon (temperature sensor) driver.
>
> +config GENERIC_LAPTOP
> + tristate "Generic Loongson-3 Laptop Driver"
> + depends on ACPI
> + depends on BACKLIGHT_CLASS_DEVICE
> + depends on INPUT
> + depends on MACH_LOONGSON64
> + select INPUT_EVDEV
> + select INPUT_SPARSEKMAP
> + default y
> + help
> + ACPI-based Loongson-3 family laptops generic driver.
> +
> endif # LOONGARCH_PLATFORM_DEVICES
> diff --git a/drivers/platform/loongarch/Makefile b/drivers/platform/loongarch/Makefile
> index 8dfd03924c37..9d6f69f2319d 100644
> --- a/drivers/platform/loongarch/Makefile
> +++ b/drivers/platform/loongarch/Makefile
> @@ -1 +1,2 @@
> obj-$(CONFIG_CPU_HWMON) += cpu_hwmon.o
> +obj-$(CONFIG_GENERIC_LAPTOP) += generic-laptop.o
> diff --git a/drivers/platform/loongarch/generic-laptop.c b/drivers/platform/loongarch/generic-laptop.c
> new file mode 100644
> index 000000000000..90c866f29702
> --- /dev/null
> +++ b/drivers/platform/loongarch/generic-laptop.c
> @@ -0,0 +1,747 @@
> +/*
> + * Generic Loongson processor based LAPTOP/ALL-IN-ONE driver
> + *
> + * Jianmin Lv <lvjianmin@xxxxxxxxxxx>
> + * Huacai Chen <chenhuacai@xxxxxxxxxxx>
> + *
> + * Copyright (C) 2022 Loongson Technology Corporation Limited
> + */
> +
> +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
> +
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/init.h>
> +#include <linux/types.h>
> +#include <linux/string.h>
> +#include <linux/platform_device.h>
> +#include <linux/input.h>
> +#include <linux/acpi.h>
> +#include <linux/uaccess.h>
> +#include <linux/input/sparse-keymap.h>
> +#include <linux/device.h>
> +#include <linux/backlight.h>
> +#include <acpi/video.h>
> +
> +/* ACPI HIDs */
> +#define LOONGSON_ACPI_HKEY_HID "LOON0000"
> +#define LOONGSON_ACPI_EC_HID "PNP0C09"
> +
> +/* Main driver */
> +
> +#define ACPI_LAPTOP_VERSION "1.0"
> +#define ACPI_LAPTOP_NAME "loongson-laptop"
> +#define ACPI_LAPTOP_DESC "Loongson Laptop/all-in-one ACPI Driver"
> +#define ACPI_LAPTOP_FILE ACPI_LAPTOP_NAME "_acpi"
> +#define ACPI_LAPTOP_DRVR_NAME ACPI_LAPTOP_FILE
> +#define ACPI_LAPTOP_ACPI_EVENT_PREFIX "loongson"
> +
> +/* Driver-wide structs and misc. variables */
> +
> +struct generic_struct;
> +
> +struct generic_acpi_drv_struct {
> + u32 type;
> + acpi_handle *handle;
> + const struct acpi_device_id *hid;
> + struct acpi_device *device;
> + struct acpi_driver *driver;
> + void (*notify)(struct generic_struct *, u32);
> +};
> +
> +struct generic_struct {
> + char *name;
> +
> + int (*init)(struct generic_struct *);
> +
> + struct generic_acpi_drv_struct *acpi;
> +
> + struct {
> + u8 acpi_driver_registered;
> + u8 acpi_notify_installed;
> + } flags;
> +};
> +
> +
> +static struct {
> + u32 input_device_registered:1;
> +} generic_features;
> +
> +static int hotkey_status_get(int *status);
> +static int loongson_laptop_backlight_update(struct backlight_device *bd);
> +
> +/* 1. ACPI Helpers and device model */
> +
> +/* ACPI basic handles */
> +
> +static acpi_handle ec_handle;
> +
> +#define GENERIC_HANDLE(object, parent, paths...) \
> + static acpi_handle object##_handle; \
> + static const acpi_handle * const object##_parent __initconst = \
> + &parent##_handle; \
> + static char *object##_paths[] __initdata = { paths }
> +
> +GENERIC_HANDLE(hkey, ec, "\\_SB.HKEY", "^HKEY", "HKEY",);
> +
> +/* ACPI device model */
> +
> +#define GENERIC_ACPIHANDLE_INIT(object) \
> + drv_acpi_handle_init(#object, &object##_handle, *object##_parent, \
> + object##_paths, ARRAY_SIZE(object##_paths))
> +
> +static void __init drv_acpi_handle_init(const char *name,
> + acpi_handle *handle, const acpi_handle parent,
> + char **paths, const int num_paths)
> +{
> + int i;
> + acpi_status status;
> +
> + for (i = 0; i < num_paths; i++) {
> + status = acpi_get_handle(parent, paths[i], handle);
> + if (ACPI_SUCCESS(status))
> + return;
> + }
> +
> + *handle = NULL;
> +}
> +static acpi_status __init generic_acpi_handle_locate_callback(acpi_handle handle,
> + u32 level, void *context, void **return_value)
> +{
> + *(acpi_handle *)return_value = handle;
> +
> + return AE_CTRL_TERMINATE;
> +}
> +
> +static void __init generic_acpi_handle_locate(const char *name,
> + const char *hid, acpi_handle *handle)
> +{
> + acpi_status status;
> + acpi_handle device_found;
> +
> + BUG_ON(!name || !hid || !handle);
> +
> + *handle = NULL;
> +
> + memset(&device_found, 0, sizeof(device_found));
> + status = acpi_get_devices(hid, generic_acpi_handle_locate_callback,
> + (void *)name, &device_found);
> +
> + if (ACPI_SUCCESS(status))
> + *handle = device_found;
> +}
> +
> +static void dispatch_acpi_notify(acpi_handle handle, u32 event, void *data)
> +{
> + struct generic_struct *sub_driver = data;
> +
> + if (!sub_driver || !sub_driver->acpi || !sub_driver->acpi->notify)
> + return;
> + sub_driver->acpi->notify(sub_driver, event);
> +}
> +
> +static int __init setup_acpi_notify(struct generic_struct *sub_driver)
> +{
> + acpi_status status;
> +
> + BUG_ON(!sub_driver->acpi);
> +
> + if (!*sub_driver->acpi->handle)
> + return 0;
> +
> + sub_driver->acpi->device = acpi_fetch_acpi_dev(*sub_driver->acpi->handle);
> + if (!sub_driver->acpi->device) {
> + pr_err("acpi_fetch_acpi_dev(%s) failed\n", sub_driver->name);
> + return -ENODEV;
> + }
> +
> + sub_driver->acpi->device->driver_data = sub_driver;
> + sprintf(acpi_device_class(sub_driver->acpi->device), "%s/%s",
> + ACPI_LAPTOP_ACPI_EVENT_PREFIX,
> + sub_driver->name);
> +
> + status = acpi_install_notify_handler(*sub_driver->acpi->handle,
> + sub_driver->acpi->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->flags.acpi_notify_installed = 1;
> + return 0;
> +}
> +
> +static int __init tpacpi_device_add(struct acpi_device *device)
> +{
> + return 0;
> +}
> +
> +static struct input_dev *generic_inputdev;
> +
> +static int loongson_generic_suspend(struct device *dev)
> +{
> + return 0;
> +}
> +static int loongson_generic_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))
> + 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 data set，which
> + * data set inclue zero set and no zero set. 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_generic_pm,
> + loongson_generic_suspend, loongson_generic_resume);
> +
> +static int __init register_generic_subdriver(struct generic_struct *sub_driver)
> +{
> + int rc;
> +
> + BUG_ON(!sub_driver->acpi);
> +
> + sub_driver->acpi->driver = kzalloc(sizeof(struct acpi_driver), GFP_KERNEL);
Please don't use acpi_driver here. Use a platform driver instead and
bind to the platform device created by the ACPI subsystem for your
ACPI device object.
> + if (!sub_driver->acpi->driver) {
> + pr_err("Failed to allocate memory for ibm->acpi->driver\n");
> + return -ENOMEM;
> + }
> +
> + sprintf(sub_driver->acpi->driver->name, "%s_%s", ACPI_LAPTOP_NAME, sub_driver->name);
> + sub_driver->acpi->driver->ids = sub_driver->acpi->hid;
> + sub_driver->acpi->driver->ops.add = &tpacpi_device_add;
> + sub_driver->acpi->driver->drv.pm = pm_ptr(&loongson_generic_pm);
> + rc = acpi_bus_register_driver(sub_driver->acpi->driver);
> + if (rc < 0) {
> + pr_err("acpi_bus_register_driver(%s) failed: %d\n", sub_driver->name, rc);
> + kfree(sub_driver->acpi->driver);
> + sub_driver->acpi->driver = NULL;
> + } else if (!rc)
> + sub_driver->flags.acpi_driver_registered = 1;
> +
> + return rc;
> +}
> +
> +#define MAX_ACPI_ARGS 3
> +
> +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;
> +}
> +
> +/* Loongson generic laptop firmware event model */
> +
> +#define GENERIC_HOTKEY_MAP_MAX 64
> +#define METHOD_NAME__KMAP "KMAP"
> +static struct key_entry hotkey_keycode_map[GENERIC_HOTKEY_MAP_MAX];
> +
> +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(hkey_handle, METHOD_NAME__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 *sub_pack = &pack->package.elements[index];
> + union acpi_object *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(hkey_handle, NULL, "VCBL", "vd", enable ? 1 : 0))
> + return -EIO;
> +
> + return 0;
> +}
> +
> +static int __init event_init(struct generic_struct *sub_driver)
> +{
> + int ret;
> +
> + GENERIC_ACPIHANDLE_INIT(hkey);
> + 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(false);
> + else
> + hotkey_backlight_set(true);
> +
> + pr_info("ACPI: enabling firmware HKEY event interface...\n");
> +
> + return ret;
> +}
> +
> +#define GENERIC_EVENT_TYPE_OFF 12
> +#define GENERIC_EVENT_MASK 0xFFF
> +
> +static int ec_get_brightness(void)
> +{
> + int status = 0;
> +
> + if (!hkey_handle)
> + return -ENXIO;
> +
> + if (!acpi_evalf(hkey_handle, &status, "ECBG", "d"))
> + return -EIO;
> +
> + if (status < 0)
> + return status;
> +
> + return status;
> +}
> +
> +static int ec_set_brightness(int level)
> +{
> +
> + int ret = 0;
> +
> + if (!hkey_handle)
> + return -ENXIO;
> +
> + if (!acpi_evalf(hkey_handle, NULL, "ECBS", "vd", level))
> + ret = -EIO;
> +
> + return ret;
> +}
> +
> +static int ec_backlight_level(u8 level)
> +{
> + int status = 0;
> +
> + if (!hkey_handle)
> + return -ENXIO;
> +
> + if (!acpi_evalf(hkey_handle, &status, "ECLL", "d"))
> + return -EIO;
> +
> + if ((status < 0) || (level > status))
> + return status;
> +
> + if (!acpi_evalf(hkey_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)
> +{
> + u8 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));
> + props.type = BACKLIGHT_PLATFORM;
> +
> + if (!acpi_evalf(hkey_handle, &status, "ECLL", "d"))
> + return -EIO;
> +
> + props.brightness = 1;
> + props.max_brightness = status;
> +
> + 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 hotkey_status_get(int *status)
> +{
> + if (!acpi_evalf(hkey_handle, status, "GSWS", "d"))
> + return -EIO;
> +
> + return 0;
> +}
> +
> +static void event_notify(struct generic_struct *sub_driver, u32 event)
> +{
> + struct key_entry *ke = NULL;
> + int scan_code = event & GENERIC_EVENT_MASK;
> + int type = (event >> GENERIC_EVENT_TYPE_OFF) & 0xF;
> +
> + ke = sparse_keymap_entry_from_scancode(generic_inputdev, scan_code);
> + if (ke) {
> + if (type == KE_SW) {
> + int status = 0;
> +
> + if (hotkey_status_get(&status))
> + return;
> +
> + ke->sw.value = !!(status & (1 << ke->sw.code));
> + }
> + sparse_keymap_report_entry(generic_inputdev, ke, 1, true);
> + }
> +}
> +
> +static const struct acpi_device_id loongson_htk_device_ids[] = {
> + {LOONGSON_ACPI_HKEY_HID, 0},
> + {"", 0},
> +};
> +
> +static struct generic_acpi_drv_struct ec_event_acpidriver = {
> + .hid = loongson_htk_device_ids,
> + .notify = event_notify,
> + .handle = &hkey_handle,
> + .type = ACPI_DEVICE_NOTIFY,
> +};
> +
> +/* 2. Infrastructure */
> +
> +static int __init probe_for_generic(void)
> +{
> + if (acpi_disabled)
> + return -ENODEV;
> +
> + /* The EC handler is required */
> + generic_acpi_handle_locate("ec", LOONGSON_ACPI_EC_HID, &ec_handle);
> + if (!ec_handle)
> + return -ENODEV;
> +
> + return 0;
> +}
> +
> +static void generic_exit(struct generic_struct *sub_driver)
> +{
> +
> + if (sub_driver->flags.acpi_notify_installed) {
> + BUG_ON(!sub_driver->acpi);
> + acpi_remove_notify_handler(*sub_driver->acpi->handle,
> + sub_driver->acpi->type,
> + dispatch_acpi_notify);
> + sub_driver->flags.acpi_notify_installed = 0;
> + }
> +
> + if (sub_driver->flags.acpi_driver_registered) {
> + BUG_ON(!sub_driver->acpi);
> + acpi_bus_unregister_driver(sub_driver->acpi->driver);
> + kfree(sub_driver->acpi->driver);
> + sub_driver->acpi->driver = NULL;
> + sub_driver->flags.acpi_driver_registered = 0;
> + }
> +
> +}
> +
> +static int __init generic_subdriver_init(struct generic_struct *sub_driver)
> +{
> + int ret;
> +
> + BUG_ON(sub_driver == NULL);
> +
> + if (sub_driver->init)
> + sub_driver->init(sub_driver);
> +
> + if (sub_driver->acpi) {
> + if (sub_driver->acpi->hid) {
> + ret = register_generic_subdriver(sub_driver);
> + if (ret)
> + goto err_out;
> + }
> +
> + if (sub_driver->acpi->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_exit(sub_driver);
> + return (ret < 0) ? ret : 0;
> +}
> +
> +/* Module init, exit, parameters */
> +static struct generic_struct generic_sub_drivers[] __initdata = {
> + {
> + .name = "EC Event",
> + .init = event_init,
> + .acpi = &ec_event_acpidriver,
> + },
> +};
> +
> +static void generic_acpi_laptop_exit(void);
> +
> +static int __init generic_acpi_laptop_init(void)
> +{
> + int i, ret, status;
> +
> + ret = probe_for_generic();
> + if (ret < 0)
> + return ret;
> +
> + 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_DRVR_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) {
> + generic_acpi_laptop_exit();
> + return ret;
> + }
> + }
> +
> + ret = input_register_device(generic_inputdev);
> + if (ret < 0) {
> + pr_err("Unable to register input device\n");
> + generic_acpi_laptop_exit();
> + return ret;
> + }
> +
> + generic_features.input_device_registered = 1;
> +
> + if (acpi_evalf(hkey_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 (generic_features.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_ALIAS("platform:acpi-laptop");
> +MODULE_AUTHOR("Jianmin Lv <lvjianmin@xxxxxxxxxxx>");
> +MODULE_AUTHOR("Huacai Chen <chenhuacai@xxxxxxxxxxx>");
> +MODULE_DESCRIPTION(ACPI_LAPTOP_DESC);
> +MODULE_VERSION(ACPI_LAPTOP_VERSION);
> +MODULE_LICENSE("GPL");
> --
> 2.31.1
>
