Driver for PCengines APUv2 board's front LEDs and Button,
which are attached to AMD PCH GPIOs. Due to lack of dedicated
ACPI entry, detecting the board via DMI.
Cc: linux-gpio@xxxxxxxxxxxxxxx
Cc: linus.walleij@xxxxxxxxxx
Cc: bgolaszewski@xxxxxxxxxxxx
Cc: dvhart@xxxxxxxxxxxxx
Cc: andy@xxxxxxxxxxxxx
Cc: platform-driver-x86@xxxxxxxxxxxxxxx
Signed-off-by: Enrico Weigelt, metux IT consult <info@xxxxxxxxx>
---
MAINTAINERS | 5 +
drivers/platform/x86/Kconfig | 12 ++
drivers/platform/x86/Makefile | 1 +
drivers/platform/x86/pcengines-apuv2.c | 261 +++++++++++++++++++++++++++++++++
4 files changed, 279 insertions(+)
create mode 100644 drivers/platform/x86/pcengines-apuv2.c
diff --git a/MAINTAINERS b/MAINTAINERS
index d286e7d..d39e029 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -11522,6 +11522,11 @@ F: lib/parman.c
F: lib/test_parman.c
F: include/linux/parman.h
+PC ENGINES APU BOARD DRIVER
+M: Enrico Weigelt, metux IT consult <info@xxxxxxxxx>
+S: Maintained
+F: drivers/platform/x86/pcengines-apuv2.c
+
PC87360 HARDWARE MONITORING DRIVER
M: Jim Cromie <jim.cromie@xxxxxxxxx>
L: linux-hwmon@xxxxxxxxxxxxxxx
diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index b5e9db8..851ea92 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -1303,6 +1303,18 @@ config HUAWEI_WMI
To compile this driver as a module, choose M here: the module
will be called huawei-wmi.
+config PCENGINES_APU2
+ tristate "PC Engines APUv2/3 front button and LEDs driver"
+ select GPIO_AMD_FCH
+ select KEYBOARD_GPIO_POLLED
+ select LEDS_GPIO
+ help
+ This driver provides support for the front button and LEDs on
+ PC Engines APUv2/APUv3 board.
+
+ To compile this driver as a module, choose M here: the module
+ will be called pcengines-apuv2.
+
endif # X86_PLATFORM_DEVICES
config PMC_ATOM
diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile
index ce8da26..86cb766 100644
--- a/drivers/platform/x86/Makefile
+++ b/drivers/platform/x86/Makefile
@@ -96,3 +96,4 @@ obj-$(CONFIG_INTEL_TURBO_MAX_3) += intel_turbo_max_3.o
obj-$(CONFIG_INTEL_CHTDC_TI_PWRBTN) += intel_chtdc_ti_pwrbtn.o
obj-$(CONFIG_I2C_MULTI_INSTANTIATE) += i2c-multi-instantiate.o
obj-$(CONFIG_INTEL_ATOMISP2_PM) += intel_atomisp2_pm.o
+obj-$(CONFIG_PCENGINES_APU2) += pcengines-apuv2.o
diff --git a/drivers/platform/x86/pcengines-apuv2.c b/drivers/platform/x86/pcengines-apuv2.c
new file mode 100644
index 0000000..dcb084f
--- /dev/null
+++ b/drivers/platform/x86/pcengines-apuv2.c
@@ -0,0 +1,261 @@
+// 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@xxxxxxxxx>
+ */
+
+#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
+
+/* 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
+
+/* 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,
+};
+
+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",
+};
+
+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,
+};
+
+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_SETUP,
+ .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",
+};
+
+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/ maainline 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,
+ },
+ {}
+};
+
+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)
+{
+ int rc;
+ 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@xxxxxxxxx>");
+MODULE_DESCRIPTION("PC Engines APUv2/APUv3 board GPIO/LED/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);
+MODULE_SOFTDEP("pre: platform:leds-gpio");
+MODULE_SOFTDEP("pre: platform:gpio_keys_polled");
--
1.9.1
