1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0+
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Driver for controlling LEDs for cameras connected to the Intel atomisp2
4*4882a593Smuzhiyun * The main purpose of this driver is to turn off LEDs which are on at boot.
5*4882a593Smuzhiyun *
6*4882a593Smuzhiyun * Copyright (C) 2020 Hans de Goede <hdegoede@redhat.com>
7*4882a593Smuzhiyun */
8*4882a593Smuzhiyun
9*4882a593Smuzhiyun #include <linux/dmi.h>
10*4882a593Smuzhiyun #include <linux/gpio/consumer.h>
11*4882a593Smuzhiyun #include <linux/gpio/machine.h>
12*4882a593Smuzhiyun #include <linux/leds.h>
13*4882a593Smuzhiyun #include <linux/module.h>
14*4882a593Smuzhiyun #include <linux/mod_devicetable.h>
15*4882a593Smuzhiyun #include <linux/platform_device.h>
16*4882a593Smuzhiyun #include <linux/workqueue.h>
17*4882a593Smuzhiyun
18*4882a593Smuzhiyun /* This must be leds-gpio as the leds-gpio driver binds to the name */
19*4882a593Smuzhiyun #define DEV_NAME "leds-gpio"
20*4882a593Smuzhiyun
21*4882a593Smuzhiyun static const struct gpio_led atomisp2_leds[] = {
22*4882a593Smuzhiyun {
23*4882a593Smuzhiyun .name = "atomisp2::camera",
24*4882a593Smuzhiyun .default_state = LEDS_GPIO_DEFSTATE_OFF,
25*4882a593Smuzhiyun },
26*4882a593Smuzhiyun };
27*4882a593Smuzhiyun
28*4882a593Smuzhiyun static const struct gpio_led_platform_data atomisp2_leds_pdata = {
29*4882a593Smuzhiyun .num_leds = ARRAY_SIZE(atomisp2_leds),
30*4882a593Smuzhiyun .leds = atomisp2_leds,
31*4882a593Smuzhiyun };
32*4882a593Smuzhiyun
33*4882a593Smuzhiyun static struct gpiod_lookup_table asus_t100ta_lookup = {
34*4882a593Smuzhiyun .dev_id = DEV_NAME,
35*4882a593Smuzhiyun .table = {
36*4882a593Smuzhiyun GPIO_LOOKUP_IDX("INT33FC:02", 8, NULL, 0, GPIO_ACTIVE_HIGH),
37*4882a593Smuzhiyun { }
38*4882a593Smuzhiyun }
39*4882a593Smuzhiyun };
40*4882a593Smuzhiyun
41*4882a593Smuzhiyun static struct gpiod_lookup_table asus_t100chi_lookup = {
42*4882a593Smuzhiyun .dev_id = DEV_NAME,
43*4882a593Smuzhiyun .table = {
44*4882a593Smuzhiyun GPIO_LOOKUP_IDX("INT33FC:01", 24, NULL, 0, GPIO_ACTIVE_HIGH),
45*4882a593Smuzhiyun { }
46*4882a593Smuzhiyun }
47*4882a593Smuzhiyun };
48*4882a593Smuzhiyun
49*4882a593Smuzhiyun static const struct dmi_system_id atomisp2_led_systems[] __initconst = {
50*4882a593Smuzhiyun {
51*4882a593Smuzhiyun .matches = {
52*4882a593Smuzhiyun DMI_EXACT_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
53*4882a593Smuzhiyun DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "T100TA"),
54*4882a593Smuzhiyun },
55*4882a593Smuzhiyun .driver_data = &asus_t100ta_lookup,
56*4882a593Smuzhiyun },
57*4882a593Smuzhiyun {
58*4882a593Smuzhiyun .matches = {
59*4882a593Smuzhiyun DMI_EXACT_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
60*4882a593Smuzhiyun DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "T200TA"),
61*4882a593Smuzhiyun },
62*4882a593Smuzhiyun .driver_data = &asus_t100ta_lookup,
63*4882a593Smuzhiyun },
64*4882a593Smuzhiyun {
65*4882a593Smuzhiyun .matches = {
66*4882a593Smuzhiyun DMI_EXACT_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
67*4882a593Smuzhiyun DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "T100CHI"),
68*4882a593Smuzhiyun },
69*4882a593Smuzhiyun .driver_data = &asus_t100chi_lookup,
70*4882a593Smuzhiyun },
71*4882a593Smuzhiyun {} /* Terminating entry */
72*4882a593Smuzhiyun };
73*4882a593Smuzhiyun MODULE_DEVICE_TABLE(dmi, atomisp2_led_systems);
74*4882a593Smuzhiyun
75*4882a593Smuzhiyun static struct gpiod_lookup_table *gpio_lookup;
76*4882a593Smuzhiyun static struct platform_device *pdev;
77*4882a593Smuzhiyun
atomisp2_led_init(void)78*4882a593Smuzhiyun static int __init atomisp2_led_init(void)
79*4882a593Smuzhiyun {
80*4882a593Smuzhiyun const struct dmi_system_id *system;
81*4882a593Smuzhiyun
82*4882a593Smuzhiyun system = dmi_first_match(atomisp2_led_systems);
83*4882a593Smuzhiyun if (!system)
84*4882a593Smuzhiyun return -ENODEV;
85*4882a593Smuzhiyun
86*4882a593Smuzhiyun gpio_lookup = system->driver_data;
87*4882a593Smuzhiyun gpiod_add_lookup_table(gpio_lookup);
88*4882a593Smuzhiyun
89*4882a593Smuzhiyun pdev = platform_device_register_resndata(NULL,
90*4882a593Smuzhiyun DEV_NAME, PLATFORM_DEVID_NONE,
91*4882a593Smuzhiyun NULL, 0, &atomisp2_leds_pdata,
92*4882a593Smuzhiyun sizeof(atomisp2_leds_pdata));
93*4882a593Smuzhiyun if (IS_ERR(pdev))
94*4882a593Smuzhiyun gpiod_remove_lookup_table(gpio_lookup);
95*4882a593Smuzhiyun
96*4882a593Smuzhiyun return PTR_ERR_OR_ZERO(pdev);
97*4882a593Smuzhiyun }
98*4882a593Smuzhiyun
atomisp2_led_cleanup(void)99*4882a593Smuzhiyun static void __exit atomisp2_led_cleanup(void)
100*4882a593Smuzhiyun {
101*4882a593Smuzhiyun platform_device_unregister(pdev);
102*4882a593Smuzhiyun gpiod_remove_lookup_table(gpio_lookup);
103*4882a593Smuzhiyun }
104*4882a593Smuzhiyun
105*4882a593Smuzhiyun module_init(atomisp2_led_init);
106*4882a593Smuzhiyun module_exit(atomisp2_led_cleanup);
107*4882a593Smuzhiyun
108*4882a593Smuzhiyun /*
109*4882a593Smuzhiyun * The ACPI INIT method from Asus WMI's code on the T100TA and T200TA turns the
110*4882a593Smuzhiyun * LED on (without the WMI interface allowing further control over the LED).
111*4882a593Smuzhiyun * Ensure we are loaded after asus-nb-wmi so that we turn the LED off again.
112*4882a593Smuzhiyun */
113*4882a593Smuzhiyun MODULE_SOFTDEP("pre: asus_nb_wmi");
114*4882a593Smuzhiyun MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com");
115*4882a593Smuzhiyun MODULE_DESCRIPTION("Intel atomisp2 camera LED driver");
116*4882a593Smuzhiyun MODULE_LICENSE("GPL");
117