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// SPDX-License-Identifier: GPL-2.0+
/*
* PC-Engines APUv2/APUv3 board platform driver
* for GPIO buttons and LEDs
*
* Copyright (C) 2018 metux IT consult
* Author: Enrico Weigelt <info@metux.net>
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/dmi.h>
#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/leds.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/gpio_keys.h>
#include <linux/gpio/machine.h>
#include <linux/input.h>
#include <linux/platform_data/gpio/gpio-amd-fch.h>
/*
* NOTE: this driver only supports APUv2/3 - not APUv1, as this one
* has completely different register layouts.
*/
/* Register mappings */
#define APU2_GPIO_REG_LED1 AMD_FCH_GPIO_REG_GPIO57
#define APU2_GPIO_REG_LED2 AMD_FCH_GPIO_REG_GPIO58
#define APU2_GPIO_REG_LED3 AMD_FCH_GPIO_REG_GPIO59_DEVSLP1
#define APU2_GPIO_REG_MODESW AMD_FCH_GPIO_REG_GPIO32_GE1
#define APU2_GPIO_REG_SIMSWAP AMD_FCH_GPIO_REG_GPIO33_GE2
#define APU2_GPIO_REG_MPCIE2 AMD_FCH_GPIO_REG_GPIO55_DEVSLP0
#define APU2_GPIO_REG_MPCIE3 AMD_FCH_GPIO_REG_GPIO51
/* Order in which the GPIO lines are defined in the register list */
#define APU2_GPIO_LINE_LED1 0
#define APU2_GPIO_LINE_LED2 1
#define APU2_GPIO_LINE_LED3 2
#define APU2_GPIO_LINE_MODESW 3
#define APU2_GPIO_LINE_SIMSWAP 4
#define APU2_GPIO_LINE_MPCIE2 5
#define APU2_GPIO_LINE_MPCIE3 6
/* GPIO device */
static int apu2_gpio_regs[] = {
[APU2_GPIO_LINE_LED1] = APU2_GPIO_REG_LED1,
[APU2_GPIO_LINE_LED2] = APU2_GPIO_REG_LED2,
[APU2_GPIO_LINE_LED3] = APU2_GPIO_REG_LED3,
[APU2_GPIO_LINE_MODESW] = APU2_GPIO_REG_MODESW,
[APU2_GPIO_LINE_SIMSWAP] = APU2_GPIO_REG_SIMSWAP,
[APU2_GPIO_LINE_MPCIE2] = APU2_GPIO_REG_MPCIE2,
[APU2_GPIO_LINE_MPCIE3] = APU2_GPIO_REG_MPCIE3,
};
static const char * const apu2_gpio_names[] = {
[APU2_GPIO_LINE_LED1] = "front-led1",
[APU2_GPIO_LINE_LED2] = "front-led2",
[APU2_GPIO_LINE_LED3] = "front-led3",
[APU2_GPIO_LINE_MODESW] = "front-button",
[APU2_GPIO_LINE_SIMSWAP] = "simswap",
[APU2_GPIO_LINE_MPCIE2] = "mpcie2_reset",
[APU2_GPIO_LINE_MPCIE3] = "mpcie3_reset",
};
static const struct amd_fch_gpio_pdata board_apu2 = {
.gpio_num = ARRAY_SIZE(apu2_gpio_regs),
.gpio_reg = apu2_gpio_regs,
.gpio_names = apu2_gpio_names,
};
/* GPIO LEDs device */
static const struct gpio_led apu2_leds[] = {
{ .name = "apu:green:1" },
{ .name = "apu:green:2" },
{ .name = "apu:green:3" },
};
static const struct gpio_led_platform_data apu2_leds_pdata = {
.num_leds = ARRAY_SIZE(apu2_leds),
.leds = apu2_leds,
};
static struct gpiod_lookup_table gpios_led_table = {
.dev_id = "leds-gpio",
.table = {
GPIO_LOOKUP_IDX(AMD_FCH_GPIO_DRIVER_NAME, APU2_GPIO_LINE_LED1,
NULL, 0, GPIO_ACTIVE_LOW),
GPIO_LOOKUP_IDX(AMD_FCH_GPIO_DRIVER_NAME, APU2_GPIO_LINE_LED2,
NULL, 1, GPIO_ACTIVE_LOW),
GPIO_LOOKUP_IDX(AMD_FCH_GPIO_DRIVER_NAME, APU2_GPIO_LINE_LED3,
NULL, 2, GPIO_ACTIVE_LOW),
}
};
/* GPIO keyboard device */
static struct gpio_keys_button apu2_keys_buttons[] = {
{
.code = KEY_RESTART,
.active_low = 1,
.desc = "front button",
.type = EV_KEY,
.debounce_interval = 10,
.value = 1,
},
};
static const struct gpio_keys_platform_data apu2_keys_pdata = {
.buttons = apu2_keys_buttons,
.nbuttons = ARRAY_SIZE(apu2_keys_buttons),
.poll_interval = 100,
.rep = 0,
.name = "apu2-keys",
};
static struct gpiod_lookup_table gpios_key_table = {
.dev_id = "gpio-keys-polled",
.table = {
GPIO_LOOKUP_IDX(AMD_FCH_GPIO_DRIVER_NAME, APU2_GPIO_LINE_MODESW,
NULL, 0, GPIO_ACTIVE_LOW),
}
};
/* Board setup */
/* Note: matching works on string prefix, so "apu2" must come before "apu" */
static const struct dmi_system_id apu_gpio_dmi_table[] __initconst = {
/* APU2 w/ legacy BIOS < 4.0.8 */
{
.ident = "apu2",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
DMI_MATCH(DMI_BOARD_NAME, "APU2")
},
.driver_data = (void *)&board_apu2,
},
/* APU2 w/ legacy BIOS >= 4.0.8 */
{
.ident = "apu2",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
DMI_MATCH(DMI_BOARD_NAME, "apu2")
},
.driver_data = (void *)&board_apu2,
},
/* APU2 w/ mainline BIOS */
{
.ident = "apu2",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
DMI_MATCH(DMI_BOARD_NAME, "PC Engines apu2")
},
.driver_data = (void *)&board_apu2,
},
/* APU3 w/ legacy BIOS < 4.0.8 */
{
.ident = "apu3",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
DMI_MATCH(DMI_BOARD_NAME, "APU3")
},
.driver_data = (void *)&board_apu2,
},
/* APU3 w/ legacy BIOS >= 4.0.8 */
{
.ident = "apu3",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
DMI_MATCH(DMI_BOARD_NAME, "apu3")
},
.driver_data = (void *)&board_apu2,
},
/* APU3 w/ mainline BIOS */
{
.ident = "apu3",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
DMI_MATCH(DMI_BOARD_NAME, "PC Engines apu3")
},
.driver_data = (void *)&board_apu2,
},
/* APU4 w/ legacy BIOS < 4.0.8 */
{
.ident = "apu4",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
DMI_MATCH(DMI_BOARD_NAME, "APU4")
},
.driver_data = (void *)&board_apu2,
},
/* APU4 w/ legacy BIOS >= 4.0.8 */
{
.ident = "apu4",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
DMI_MATCH(DMI_BOARD_NAME, "apu4")
},
.driver_data = (void *)&board_apu2,
},
/* APU4 w/ mainline BIOS */
{
.ident = "apu4",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
DMI_MATCH(DMI_BOARD_NAME, "PC Engines apu4")
},
.driver_data = (void *)&board_apu2,
},
{}
};
static struct platform_device *apu_gpio_pdev;
static struct platform_device *apu_leds_pdev;
static struct platform_device *apu_keys_pdev;
static struct platform_device * __init apu_create_pdev(
const char *name,
const void *pdata,
size_t sz)
{
struct platform_device *pdev;
pdev = platform_device_register_resndata(NULL,
name,
PLATFORM_DEVID_NONE,
NULL,
0,
pdata,
sz);
if (IS_ERR(pdev))
pr_err("failed registering %s: %ld\n", name, PTR_ERR(pdev));
return pdev;
}
static int __init apu_board_init(void)
{
const struct dmi_system_id *id;
id = dmi_first_match(apu_gpio_dmi_table);
if (!id) {
pr_err("failed to detect APU board via DMI\n");
return -ENODEV;
}
gpiod_add_lookup_table(&gpios_led_table);
gpiod_add_lookup_table(&gpios_key_table);
apu_gpio_pdev = apu_create_pdev(
AMD_FCH_GPIO_DRIVER_NAME,
id->driver_data,
sizeof(struct amd_fch_gpio_pdata));
apu_leds_pdev = apu_create_pdev(
"leds-gpio",
&apu2_leds_pdata,
sizeof(apu2_leds_pdata));
apu_keys_pdev = apu_create_pdev(
"gpio-keys-polled",
&apu2_keys_pdata,
sizeof(apu2_keys_pdata));
return 0;
}
static void __exit apu_board_exit(void)
{
gpiod_remove_lookup_table(&gpios_led_table);
gpiod_remove_lookup_table(&gpios_key_table);
platform_device_unregister(apu_keys_pdev);
platform_device_unregister(apu_leds_pdev);
platform_device_unregister(apu_gpio_pdev);
}
module_init(apu_board_init);
module_exit(apu_board_exit);
MODULE_AUTHOR("Enrico Weigelt, metux IT consult <info@metux.net>");
MODULE_DESCRIPTION("PC Engines APUv2/APUv3 board GPIO/LEDs/keys driver");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(dmi, apu_gpio_dmi_table);
MODULE_ALIAS("platform:pcengines-apuv2");
MODULE_SOFTDEP("pre: platform:" AMD_FCH_GPIO_DRIVER_NAME " platform:leds-gpio platform:gpio_keys_polled");
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