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// SPDX-License-Identifier: GPL-2.0+
/*
* Driver for controlling LEDs for cameras connected to the Intel atomisp2
* The main purpose of this driver is to turn off LEDs which are on at boot.
*
* Copyright (C) 2020 Hans de Goede <hdegoede@redhat.com>
*/
#include <linux/dmi.h>
#include <linux/gpio/consumer.h>
#include <linux/gpio/machine.h>
#include <linux/leds.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/platform_device.h>
#include <linux/workqueue.h>
/* This must be leds-gpio as the leds-gpio driver binds to the name */
#define DEV_NAME "leds-gpio"
static const struct gpio_led atomisp2_leds[] = {
{
.name = "atomisp2::camera",
.default_state = LEDS_GPIO_DEFSTATE_OFF,
},
};
static const struct gpio_led_platform_data atomisp2_leds_pdata = {
.num_leds = ARRAY_SIZE(atomisp2_leds),
.leds = atomisp2_leds,
};
static struct gpiod_lookup_table asus_t100ta_lookup = {
.dev_id = DEV_NAME,
.table = {
GPIO_LOOKUP_IDX("INT33FC:02", 8, NULL, 0, GPIO_ACTIVE_HIGH),
{ }
}
};
static struct gpiod_lookup_table asus_t100chi_lookup = {
.dev_id = DEV_NAME,
.table = {
GPIO_LOOKUP_IDX("INT33FC:01", 24, NULL, 0, GPIO_ACTIVE_HIGH),
{ }
}
};
static const struct dmi_system_id atomisp2_led_systems[] __initconst = {
{
.matches = {
DMI_EXACT_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "T100TA"),
},
.driver_data = &asus_t100ta_lookup,
},
{
.matches = {
DMI_EXACT_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "T200TA"),
},
.driver_data = &asus_t100ta_lookup,
},
{
.matches = {
DMI_EXACT_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "T100CHI"),
},
.driver_data = &asus_t100chi_lookup,
},
{} /* Terminating entry */
};
MODULE_DEVICE_TABLE(dmi, atomisp2_led_systems);
static struct gpiod_lookup_table *gpio_lookup;
static struct platform_device *pdev;
static int __init atomisp2_led_init(void)
{
const struct dmi_system_id *system;
system = dmi_first_match(atomisp2_led_systems);
if (!system)
return -ENODEV;
gpio_lookup = system->driver_data;
gpiod_add_lookup_table(gpio_lookup);
pdev = platform_device_register_resndata(NULL,
DEV_NAME, PLATFORM_DEVID_NONE,
NULL, 0, &atomisp2_leds_pdata,
sizeof(atomisp2_leds_pdata));
if (IS_ERR(pdev))
gpiod_remove_lookup_table(gpio_lookup);
return PTR_ERR_OR_ZERO(pdev);
}
static void __exit atomisp2_led_cleanup(void)
{
platform_device_unregister(pdev);
gpiod_remove_lookup_table(gpio_lookup);
}
module_init(atomisp2_led_init);
module_exit(atomisp2_led_cleanup);
/*
* The ACPI INIT method from Asus WMI's code on the T100TA and T200TA turns the
* LED on (without the WMI interface allowing further control over the LED).
* Ensure we are loaded after asus-nb-wmi so that we turn the LED off again.
*/
MODULE_SOFTDEP("pre: asus_nb_wmi");
MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com");
MODULE_DESCRIPTION("Intel atomisp2 camera LED driver");
MODULE_LICENSE("GPL");
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