LXR linux/drivers/platform/x86/intel_atomisp2

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * Driver for controlling LEDs for cameras connected to the Intel atomisp2
   4 * 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                        DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "T100TA"),
  54                },
  55                .driver_data = &asus_t100ta_lookup,
  56        },
  57        {
  58                .matches = {
  59                        DMI_EXACT_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
  60                        DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "T200TA"),
  61                },
  62                .driver_data = &asus_t100ta_lookup,
  63        },
  64        {
  65                .matches = {
  66                        DMI_EXACT_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
  67                        DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "T100CHI"),
  68                },
  69                .driver_data = &asus_t100chi_lookup,
  70        },
  71        {} /* Terminating entry */
  72};
  73MODULE_DEVICE_TABLE(dmi, atomisp2_led_systems);
  74
  75static struct gpiod_lookup_table *gpio_lookup;
  76static struct platform_device *pdev;
  77
  78static int __init atomisp2_led_init(void)
  79{
  80        const struct dmi_system_id *system;
  81
  82        system = dmi_first_match(atomisp2_led_systems);
  83        if (!system)
  84                return -ENODEV;
  85
  86        gpio_lookup = system->driver_data;
  87        gpiod_add_lookup_table(gpio_lookup);
  88
  89        pdev = platform_device_register_resndata(NULL,
  90                                                 DEV_NAME, PLATFORM_DEVID_NONE,
  91                                                 NULL, 0, &atomisp2_leds_pdata,
  92                                                 sizeof(atomisp2_leds_pdata));
  93        if (IS_ERR(pdev))
  94                gpiod_remove_lookup_table(gpio_lookup);
  95
  96        return PTR_ERR_OR_ZERO(pdev);
  97}
  98
  99static void __exit atomisp2_led_cleanup(void)
 100{
 101        platform_device_unregister(pdev);
 102        gpiod_remove_lookup_table(gpio_lookup);
 103}
 104
 105module_init(atomisp2_led_init);
 106module_exit(atomisp2_led_cleanup);
 107
 108/*
 109 * The ACPI INIT method from Asus WMI's code on the T100TA and T200TA turns the
 110 * LED on (without the WMI interface allowing further control over the LED).
 111 * Ensure we are loaded after asus-nb-wmi so that we turn the LED off again.
 112 */
 113MODULE_SOFTDEP("pre: asus_nb_wmi");
 114MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com");
 115MODULE_DESCRIPTION("Intel atomisp2 camera LED driver");
 116MODULE_LICENSE("GPL");
 117