summaryrefslogtreecommitdiffstats
path: root/drivers/platform
diff options
context:
space:
mode:
authorEnrico Weigelt, metux IT consult <info@metux.net>2019-02-14 23:04:57 +0100
committerLinus Walleij <linus.walleij@linaro.org>2019-02-22 17:28:08 +0100
commitf8eb0235f65989fc5521c40c78d1261e7f25cdbe (patch)
tree956fb7895143909024d3eb75bd1c29f820c1b220 /drivers/platform
parente09d168f13f0d63df7fe095d52be04c16cbe1cef (diff)
downloadlinux-f8eb0235f65989fc5521c40c78d1261e7f25cdbe.tar.bz2
x86: pcengines apuv2 gpio/leds/keys platform driver
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@vger.kernel.org Cc: linus.walleij@linaro.org Cc: bgolaszewski@baylibre.com Cc: dvhart@infradead.org Cc: platform-driver-x86@vger.kernel.org Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by: Enrico Weigelt, metux IT consult <info@metux.net> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/platform')
-rw-r--r--drivers/platform/x86/Kconfig12
-rw-r--r--drivers/platform/x86/Makefile1
-rw-r--r--drivers/platform/x86/pcengines-apuv2.c261
3 files changed, 274 insertions, 0 deletions
diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index b5e9db85e881..851ea921a58d 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 ce8da260c223..86cb76677bc8 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 000000000000..dcb084f6b892
--- /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@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
+
+/* 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@metux.net>");
+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");