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
35 #define APU2_GPIO_REG_MPCIE2 AMD_FCH_GPIO_REG_GPIO59_DEVSLP0
36 #define APU2_GPIO_REG_MPCIE3 AMD_FCH_GPIO_REG_GPIO51
38 /* Order in which the GPIO lines are defined in the register list */
39 #define APU2_GPIO_LINE_LED1 0
40 #define APU2_GPIO_LINE_LED2 1
41 #define APU2_GPIO_LINE_LED3 2
42 #define APU2_GPIO_LINE_MODESW 3
43 #define APU2_GPIO_LINE_SIMSWAP 4
44 #define APU2_GPIO_LINE_MPCIE2 5
45 #define APU2_GPIO_LINE_MPCIE3 6
49 static int apu2_gpio_regs[] = {
50 [APU2_GPIO_LINE_LED1] = APU2_GPIO_REG_LED1,
51 [APU2_GPIO_LINE_LED2] = APU2_GPIO_REG_LED2,
52 [APU2_GPIO_LINE_LED3] = APU2_GPIO_REG_LED3,
53 [APU2_GPIO_LINE_MODESW] = APU2_GPIO_REG_MODESW,
54 [APU2_GPIO_LINE_SIMSWAP] = APU2_GPIO_REG_SIMSWAP,
55 [APU2_GPIO_LINE_MPCIE2] = APU2_GPIO_REG_MPCIE2,
56 [APU2_GPIO_LINE_MPCIE3] = APU2_GPIO_REG_MPCIE3,
59 static const char * const apu2_gpio_names[] = {
60 [APU2_GPIO_LINE_LED1] = "front-led1",
61 [APU2_GPIO_LINE_LED2] = "front-led2",
62 [APU2_GPIO_LINE_LED3] = "front-led3",
63 [APU2_GPIO_LINE_MODESW] = "front-button",
64 [APU2_GPIO_LINE_SIMSWAP] = "simswap",
65 [APU2_GPIO_LINE_MPCIE2] = "mpcie2_reset",
66 [APU2_GPIO_LINE_MPCIE3] = "mpcie3_reset",
69 static const struct amd_fch_gpio_pdata board_apu2 = {
70 .gpio_num = ARRAY_SIZE(apu2_gpio_regs),
71 .gpio_reg = apu2_gpio_regs,
72 .gpio_names = apu2_gpio_names,
75 /* GPIO LEDs device */
77 static const struct gpio_led apu2_leds[] = {
78 { .name = "apu:green:1" },
79 { .name = "apu:green:2" },
80 { .name = "apu:green:3" },
81 { .name = "apu:simswap" },
84 static const struct gpio_led_platform_data apu2_leds_pdata = {
85 .num_leds = ARRAY_SIZE(apu2_leds),
89 static struct gpiod_lookup_table gpios_led_table = {
90 .dev_id = "leds-gpio",
92 GPIO_LOOKUP_IDX(AMD_FCH_GPIO_DRIVER_NAME, APU2_GPIO_LINE_LED1,
93 NULL, 0, GPIO_ACTIVE_LOW),
94 GPIO_LOOKUP_IDX(AMD_FCH_GPIO_DRIVER_NAME, APU2_GPIO_LINE_LED2,
95 NULL, 1, GPIO_ACTIVE_LOW),
96 GPIO_LOOKUP_IDX(AMD_FCH_GPIO_DRIVER_NAME, APU2_GPIO_LINE_LED3,
97 NULL, 2, GPIO_ACTIVE_LOW),
98 GPIO_LOOKUP_IDX(AMD_FCH_GPIO_DRIVER_NAME, APU2_GPIO_LINE_SIMSWAP,
99 NULL, 3, GPIO_ACTIVE_LOW),
103 /* GPIO keyboard device */
105 static struct gpio_keys_button apu2_keys_buttons[] = {
109 .desc = "front button",
111 .debounce_interval = 10,
116 static const struct gpio_keys_platform_data apu2_keys_pdata = {
117 .buttons = apu2_keys_buttons,
118 .nbuttons = ARRAY_SIZE(apu2_keys_buttons),
119 .poll_interval = 100,
124 static struct gpiod_lookup_table gpios_key_table = {
125 .dev_id = "gpio-keys-polled",
127 GPIO_LOOKUP_IDX(AMD_FCH_GPIO_DRIVER_NAME, APU2_GPIO_LINE_MODESW,
128 NULL, 0, GPIO_ACTIVE_LOW),
134 /* Note: matching works on string prefix, so "apu2" must come before "apu" */
135 static const struct dmi_system_id apu_gpio_dmi_table[] __initconst = {
137 /* APU2 w/ legacy BIOS < 4.0.8 */
141 DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
142 DMI_MATCH(DMI_BOARD_NAME, "APU2")
144 .driver_data = (void *)&board_apu2,
146 /* APU2 w/ legacy BIOS >= 4.0.8 */
150 DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
151 DMI_MATCH(DMI_BOARD_NAME, "apu2")
153 .driver_data = (void *)&board_apu2,
155 /* APU2 w/ mainline BIOS */
159 DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
160 DMI_MATCH(DMI_BOARD_NAME, "PC Engines apu2")
162 .driver_data = (void *)&board_apu2,
165 /* APU3 w/ legacy BIOS < 4.0.8 */
169 DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
170 DMI_MATCH(DMI_BOARD_NAME, "APU3")
172 .driver_data = (void *)&board_apu2,
174 /* APU3 w/ legacy BIOS >= 4.0.8 */
178 DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
179 DMI_MATCH(DMI_BOARD_NAME, "apu3")
181 .driver_data = (void *)&board_apu2,
183 /* APU3 w/ mainline BIOS */
187 DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
188 DMI_MATCH(DMI_BOARD_NAME, "PC Engines apu3")
190 .driver_data = (void *)&board_apu2,
192 /* APU4 w/ legacy BIOS < 4.0.8 */
196 DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
197 DMI_MATCH(DMI_BOARD_NAME, "APU4")
199 .driver_data = (void *)&board_apu2,
201 /* APU4 w/ legacy BIOS >= 4.0.8 */
205 DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
206 DMI_MATCH(DMI_BOARD_NAME, "apu4")
208 .driver_data = (void *)&board_apu2,
210 /* APU4 w/ mainline BIOS */
214 DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
215 DMI_MATCH(DMI_BOARD_NAME, "PC Engines apu4")
217 .driver_data = (void *)&board_apu2,
222 static struct platform_device *apu_gpio_pdev;
223 static struct platform_device *apu_leds_pdev;
224 static struct platform_device *apu_keys_pdev;
226 static struct platform_device * __init apu_create_pdev(
231 struct platform_device *pdev;
233 pdev = platform_device_register_resndata(NULL,
242 pr_err("failed registering %s: %ld\n", name, PTR_ERR(pdev));
247 static int __init apu_board_init(void)
249 const struct dmi_system_id *id;
251 id = dmi_first_match(apu_gpio_dmi_table);
253 pr_err("failed to detect APU board via DMI\n");
257 gpiod_add_lookup_table(&gpios_led_table);
258 gpiod_add_lookup_table(&gpios_key_table);
260 apu_gpio_pdev = apu_create_pdev(
261 AMD_FCH_GPIO_DRIVER_NAME,
263 sizeof(struct amd_fch_gpio_pdata));
265 apu_leds_pdev = apu_create_pdev(
268 sizeof(apu2_leds_pdata));
270 apu_keys_pdev = apu_create_pdev(
273 sizeof(apu2_keys_pdata));
278 static void __exit apu_board_exit(void)
280 gpiod_remove_lookup_table(&gpios_led_table);
281 gpiod_remove_lookup_table(&gpios_key_table);
283 platform_device_unregister(apu_keys_pdev);
284 platform_device_unregister(apu_leds_pdev);
285 platform_device_unregister(apu_gpio_pdev);
288 module_init(apu_board_init);
289 module_exit(apu_board_exit);
291 MODULE_AUTHOR("Enrico Weigelt, metux IT consult <info@metux.net>");
292 MODULE_DESCRIPTION("PC Engines APUv2/APUv3 board GPIO/LEDs/keys driver");
293 MODULE_LICENSE("GPL");
294 MODULE_DEVICE_TABLE(dmi, apu_gpio_dmi_table);
295 MODULE_ALIAS("platform:pcengines-apuv2");
296 MODULE_SOFTDEP("pre: platform:" AMD_FCH_GPIO_DRIVER_NAME " platform:leds-gpio platform:gpio_keys_polled");