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