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1// SPDX-License-Identifier: GPL-2.0+2/*3 * Driver for controlling LEDs for cameras connected to the Intel atomisp24 * The main purpose of this driver is to turn off LEDs which are on at boot.5 *6 * Copyright (C) 2020 Hans de Goede <hdegoede@redhat.com>7 */8 9#include <linux/dmi.h>10#include <linux/gpio/consumer.h>11#include <linux/gpio/machine.h>12#include <linux/leds.h>13#include <linux/module.h>14#include <linux/mod_devicetable.h>15#include <linux/platform_device.h>16#include <linux/workqueue.h>17 18/* This must be leds-gpio as the leds-gpio driver binds to the name */19#define DEV_NAME "leds-gpio"20 21static const struct gpio_led atomisp2_leds[] = {22 {23 .name = "atomisp2::camera",24 .default_state = LEDS_GPIO_DEFSTATE_OFF,25 },26};27 28static const struct gpio_led_platform_data atomisp2_leds_pdata = {29 .num_leds = ARRAY_SIZE(atomisp2_leds),30 .leds = atomisp2_leds,31};32 33static struct gpiod_lookup_table asus_t100ta_lookup = {34 .dev_id = DEV_NAME,35 .table = {36 GPIO_LOOKUP_IDX("INT33FC:02", 8, NULL, 0, GPIO_ACTIVE_HIGH),37 { }38 }39};40 41static struct gpiod_lookup_table asus_t100chi_lookup = {42 .dev_id = DEV_NAME,43 .table = {44 GPIO_LOOKUP_IDX("INT33FC:01", 24, NULL, 0, GPIO_ACTIVE_HIGH),45 { }46 }47};48 49static const struct dmi_system_id atomisp2_led_systems[] __initconst = {50 {51 .matches = {52 DMI_EXACT_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),53 /* Non exact match to also match T100TAF */54 DMI_MATCH(DMI_PRODUCT_NAME, "T100TA"),55 },56 .driver_data = &asus_t100ta_lookup,57 },58 {59 .matches = {60 DMI_EXACT_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),61 DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "T200TA"),62 },63 .driver_data = &asus_t100ta_lookup,64 },65 {66 .matches = {67 DMI_EXACT_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),68 DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "T100CHI"),69 },70 .driver_data = &asus_t100chi_lookup,71 },72 {} /* Terminating entry */73};74MODULE_DEVICE_TABLE(dmi, atomisp2_led_systems);75 76static struct gpiod_lookup_table *gpio_lookup;77static struct platform_device *pdev;78 79static int __init atomisp2_led_init(void)80{81 const struct dmi_system_id *system;82 83 system = dmi_first_match(atomisp2_led_systems);84 if (!system)85 return -ENODEV;86 87 gpio_lookup = system->driver_data;88 gpiod_add_lookup_table(gpio_lookup);89 90 pdev = platform_device_register_resndata(NULL,91 DEV_NAME, PLATFORM_DEVID_NONE,92 NULL, 0, &atomisp2_leds_pdata,93 sizeof(atomisp2_leds_pdata));94 if (IS_ERR(pdev))95 gpiod_remove_lookup_table(gpio_lookup);96 97 return PTR_ERR_OR_ZERO(pdev);98}99 100static void __exit atomisp2_led_cleanup(void)101{102 platform_device_unregister(pdev);103 gpiod_remove_lookup_table(gpio_lookup);104}105 106module_init(atomisp2_led_init);107module_exit(atomisp2_led_cleanup);108 109/*110 * The ACPI INIT method from Asus WMI's code on the T100TA and T200TA turns the111 * LED on (without the WMI interface allowing further control over the LED).112 * Ensure we are loaded after asus-nb-wmi so that we turn the LED off again.113 */114MODULE_SOFTDEP("pre: asus_nb_wmi");115MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com");116MODULE_DESCRIPTION("Intel atomisp2 camera LED driver");117MODULE_LICENSE("GPL");118