1 // SPDX-License-Identifier: GPL-2.0+
4 * PC-Engines APUv2/APUv3 board platform driver
5 * for gpio buttons and LEDs
7 * Copyright (C) 2018 metux IT consult
8 * Author: Enrico Weigelt <info@metux.net>
11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
13 #include <linux/dmi.h>
14 #include <linux/err.h>
15 #include <linux/kernel.h>
16 #include <linux/leds.h>
17 #include <linux/module.h>
18 #include <linux/platform_device.h>
19 #include <linux/gpio_keys.h>
20 #include <linux/gpio/machine.h>
21 #include <linux/input.h>
22 #include <linux/platform_data/gpio/gpio-amd-fch.h>
25 * NOTE: this driver only supports APUv2/3 - not APUv1, as this one
26 * has completely different register layouts
29 /* register mappings */
30 #define APU2_GPIO_REG_LED1 AMD_FCH_GPIO_REG_GPIO57
31 #define APU2_GPIO_REG_LED2 AMD_FCH_GPIO_REG_GPIO58
32 #define APU2_GPIO_REG_LED3 AMD_FCH_GPIO_REG_GPIO59_DEVSLP1
33 #define APU2_GPIO_REG_MODESW AMD_FCH_GPIO_REG_GPIO32_GE1
34 #define APU2_GPIO_REG_SIMSWAP AMD_FCH_GPIO_REG_GPIO33_GE2
36 /* order in which the gpio lines are defined in the register list */
37 #define APU2_GPIO_LINE_LED1 0
38 #define APU2_GPIO_LINE_LED2 1
39 #define APU2_GPIO_LINE_LED3 2
40 #define APU2_GPIO_LINE_MODESW 3
41 #define APU2_GPIO_LINE_SIMSWAP 4
45 static int apu2_gpio_regs[] = {
46 [APU2_GPIO_LINE_LED1] = APU2_GPIO_REG_LED1,
47 [APU2_GPIO_LINE_LED2] = APU2_GPIO_REG_LED2,
48 [APU2_GPIO_LINE_LED3] = APU2_GPIO_REG_LED3,
49 [APU2_GPIO_LINE_MODESW] = APU2_GPIO_REG_MODESW,
50 [APU2_GPIO_LINE_SIMSWAP] = APU2_GPIO_REG_SIMSWAP,
53 static const char * const apu2_gpio_names[] = {
54 [APU2_GPIO_LINE_LED1] = "front-led1",
55 [APU2_GPIO_LINE_LED2] = "front-led2",
56 [APU2_GPIO_LINE_LED3] = "front-led3",
57 [APU2_GPIO_LINE_MODESW] = "front-button",
58 [APU2_GPIO_LINE_SIMSWAP] = "simswap",
61 static const struct amd_fch_gpio_pdata board_apu2 = {
62 .gpio_num = ARRAY_SIZE(apu2_gpio_regs),
63 .gpio_reg = apu2_gpio_regs,
64 .gpio_names = apu2_gpio_names,
67 /* gpio leds device */
69 static const struct gpio_led apu2_leds[] = {
70 { .name = "apu:green:1" },
71 { .name = "apu:green:2" },
72 { .name = "apu:green:3" }
75 static const struct gpio_led_platform_data apu2_leds_pdata = {
76 .num_leds = ARRAY_SIZE(apu2_leds),
80 static struct gpiod_lookup_table gpios_led_table = {
81 .dev_id = "leds-gpio",
83 GPIO_LOOKUP_IDX(AMD_FCH_GPIO_DRIVER_NAME, APU2_GPIO_LINE_LED1,
84 NULL, 0, GPIO_ACTIVE_LOW),
85 GPIO_LOOKUP_IDX(AMD_FCH_GPIO_DRIVER_NAME, APU2_GPIO_LINE_LED2,
86 NULL, 1, GPIO_ACTIVE_LOW),
87 GPIO_LOOKUP_IDX(AMD_FCH_GPIO_DRIVER_NAME, APU2_GPIO_LINE_LED3,
88 NULL, 2, GPIO_ACTIVE_LOW),
92 /* gpio keyboard device */
94 static struct gpio_keys_button apu2_keys_buttons[] = {
98 .desc = "front button",
100 .debounce_interval = 10,
105 static const struct gpio_keys_platform_data apu2_keys_pdata = {
106 .buttons = apu2_keys_buttons,
107 .nbuttons = ARRAY_SIZE(apu2_keys_buttons),
108 .poll_interval = 100,
113 static struct gpiod_lookup_table gpios_key_table = {
114 .dev_id = "gpio-keys-polled",
116 GPIO_LOOKUP_IDX(AMD_FCH_GPIO_DRIVER_NAME, APU2_GPIO_LINE_MODESW,
117 NULL, 0, GPIO_ACTIVE_LOW),
123 /* note: matching works on string prefix, so "apu2" must come before "apu" */
124 static const struct dmi_system_id apu_gpio_dmi_table[] __initconst = {
126 /* APU2 w/ legacy bios < 4.0.8 */
130 DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
131 DMI_MATCH(DMI_BOARD_NAME, "APU2")
133 .driver_data = (void *)&board_apu2,
135 /* APU2 w/ legacy bios >= 4.0.8 */
139 DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
140 DMI_MATCH(DMI_BOARD_NAME, "apu2")
142 .driver_data = (void *)&board_apu2,
144 /* APU2 w/ maainline bios */
148 DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
149 DMI_MATCH(DMI_BOARD_NAME, "PC Engines apu2")
151 .driver_data = (void *)&board_apu2,
154 /* APU3 w/ legacy bios < 4.0.8 */
158 DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
159 DMI_MATCH(DMI_BOARD_NAME, "APU3")
161 .driver_data = (void *)&board_apu2,
163 /* APU3 w/ legacy bios >= 4.0.8 */
167 DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
168 DMI_MATCH(DMI_BOARD_NAME, "apu3")
170 .driver_data = (void *)&board_apu2,
172 /* APU3 w/ mainline bios */
176 DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
177 DMI_MATCH(DMI_BOARD_NAME, "PC Engines apu3")
179 .driver_data = (void *)&board_apu2,
184 static struct platform_device *apu_gpio_pdev;
185 static struct platform_device *apu_leds_pdev;
186 static struct platform_device *apu_keys_pdev;
188 static struct platform_device * __init apu_create_pdev(
193 struct platform_device *pdev;
195 pdev = platform_device_register_resndata(NULL,
204 pr_err("failed registering %s: %ld\n", name, PTR_ERR(pdev));
209 static int __init apu_board_init(void)
211 const struct dmi_system_id *id;
213 id = dmi_first_match(apu_gpio_dmi_table);
215 pr_err("failed to detect apu board via dmi\n");
219 gpiod_add_lookup_table(&gpios_led_table);
220 gpiod_add_lookup_table(&gpios_key_table);
222 apu_gpio_pdev = apu_create_pdev(
223 AMD_FCH_GPIO_DRIVER_NAME,
225 sizeof(struct amd_fch_gpio_pdata));
227 apu_leds_pdev = apu_create_pdev(
230 sizeof(apu2_leds_pdata));
232 apu_keys_pdev = apu_create_pdev(
235 sizeof(apu2_keys_pdata));
240 static void __exit apu_board_exit(void)
242 gpiod_remove_lookup_table(&gpios_led_table);
243 gpiod_remove_lookup_table(&gpios_key_table);
245 platform_device_unregister(apu_keys_pdev);
246 platform_device_unregister(apu_leds_pdev);
247 platform_device_unregister(apu_gpio_pdev);
250 module_init(apu_board_init);
251 module_exit(apu_board_exit);
253 MODULE_AUTHOR("Enrico Weigelt, metux IT consult <info@metux.net>");
254 MODULE_DESCRIPTION("PC Engines APUv2/APUv3 board GPIO/LED/keys driver");
255 MODULE_LICENSE("GPL");
256 MODULE_DEVICE_TABLE(dmi, apu_gpio_dmi_table);
257 MODULE_ALIAS("platform:pcengines-apuv2");
258 MODULE_SOFTDEP("pre: platform:" AMD_FCH_GPIO_DRIVER_NAME " platform:leds-gpio platform:gpio_keys_polled");