From: Linus Walleij <linus.walleij@xxxxxxxxxx>
This serves as an illustration of how to use the gpio-keys
in board files using static device properties and machine GPIO descriptor
tables.
It is a hack for the joystick connector on the entirely
boardfile-based SIM.ONE. It will probably not be applied.
Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
---
arch/arm/mach-ep93xx/simone.c | 60 +++++++++++++++++++++++++++++++++++
1 file changed, 60 insertions(+)
diff --git a/arch/arm/mach-ep93xx/simone.c b/arch/arm/mach-ep93xx/simone.c
index 41aa57581356..b998d6772158 100644
--- a/arch/arm/mach-ep93xx/simone.c
+++ b/arch/arm/mach-ep93xx/simone.c
@@ -24,7 +24,11 @@
#include <linux/spi/mmc_spi.h>
#include <linux/platform_data/video-ep93xx.h>
#include <linux/platform_data/spi-ep93xx.h>
+#include <linux/gpio/machine.h>
#include <linux/gpio.h>
+#include <linux/input.h>
+#include <linux/gpio_keys.h>
+#include <linux/property.h>
#include <mach/hardware.h>
#include <mach/gpio-ep93xx.h>
@@ -34,6 +38,47 @@
#include "soc.h"
+static const struct property_entry simone_key_enter_props[] __initconst = {
+ PROPERTY_ENTRY_U32("linux,code", KEY_ENTER),
+ PROPERTY_ENTRY_STRING("label", "enter"),
+ PROPERTY_ENTRY_STRING("gpios", "enter-gpios"),
+ { }
+};
+
+static const struct property_entry simone_key_up_props[] __initconst = {
+ PROPERTY_ENTRY_U32("linux,code", KEY_UP),
+ PROPERTY_ENTRY_STRING("label", "up"),
+ PROPERTY_ENTRY_STRING("gpios", "up-gpios"),
+ { }
+};
+
+static const struct property_entry simone_key_up_props[] __initconst = {
+ PROPERTY_ENTRY_U32("linux,code", KEY_LEFT),
+ PROPERTY_ENTRY_STRING("label", "left"),
+ PROPERTY_ENTRY_STRING("gpios", "left-gpios"),
+ { }
+};
+
+static const struct property_entry simone_key_props[] __initconst = {
+ /* There are no properties at device level on this device */
+ { }
+};
+
+static struct gpiod_lookup_table simone_keys_gpiod_table = {
+ .dev_id = "gpio-keys",
+ .table = {
+ /* Use local offsets on gpiochip/port "B" */
+ GPIO_LOOKUP_IDX("B", 0, "enter-gpios", 0, GPIO_ACTIVE_LOW),
+ GPIO_LOOKUP_IDX("B", 1, "up-gpios", 1, GPIO_ACTIVE_LOW),
+ GPIO_LOOKUP_IDX("B", 2, "left-gpios", 2, GPIO_ACTIVE_LOW),
+ },
+};
+
+static struct platform_device simone_keys_device = {
+ .name = "gpio-keys",
+ .id = -1,
+};
+
static struct ep93xx_eth_data __initdata simone_eth_data = {
.phy_id = 1,
};
@@ -107,6 +152,21 @@ static void __init simone_init_machine(void)
ARRAY_SIZE(simone_i2c_board_info));
ep93xx_register_spi(&simone_spi_info, simone_spi_devices,
ARRAY_SIZE(simone_spi_devices));
+
+ gpiod_add_lookup_table(&simone_keys_gpiod_table);
+ device_add_properties(&simone_keys_device.dev,
+ simone_keys_device_props);
+ device_add_child_properties(&simone_keys_device.dev,
+ dev_fwnode(&simone_keys_device.dev),
+ simone_key_enter_props);
+ device_add_child_properties(&simone_keys_device.dev,
+ dev_fwnode(&simone_keys_device.dev),
+ simone_key_up_props);
+ device_add_child_properties(&simone_keys_device.dev,
+ dev_fwnode(&simone_keys_device.dev),
+ simone_key_left_props);
+ platform_device_register(&simone_keys_device);
+
simone_register_audio();
}
--
2.19.0.397.gdd90340f6a-goog
