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f560cd5021
This reverts commit 5037d4ddda.
Explanation why this does not work:
This change connects the simswap to the LED subsystem of the kernel.
From my point of view, it's nonsense. If we do it this way, then this
can be switched relatively easily via the LED subsystem (trigger:
none/default-on) and that is dangerous! If this is used, it would be
unfavorable, since there is also another trigger (trigger:
heartbeat/netdev).
Therefore, this simswap GPIO should remain in the GPIO
subsystem and be switched via it and not be connected to the LED
subsystem. To avoid the problems mentioned above. The LED subsystem is
not made for this and it is not a good compromise, but rather dangerous.
Signed-off-by: Florian Eckert <fe@dev.tdt.de>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
294 lines
7.3 KiB
C
294 lines
7.3 KiB
C
// 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_GPIO59_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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}
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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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}
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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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