@@ -12394,6 +12394,12 @@ S: Maintained
F: Documentation/input/devices/pxrc.rst
F: drivers/input/joystick/pxrc.c
+FLYSKY FSIA6B RC RECEIVER
+M: Markus Koch <markus@notsyncing.net>
+L: linux-input@vger.kernel.org
+S: Maintained
+F: drivers/input/joystick/fsia6b.c
+
PHONET PROTOCOL
M: Remi Denis-Courmont <courmisch@gmail.com>
S: Supported
@@ -362,4 +362,14 @@ config JOYSTICK_PXRC
To compile this driver as a module, choose M here: the
module will be called pxrc.
+config JOYSTICK_FSIA6B
+ tristate "FlySky FS-iA6B RC Receiver"
+ select SERIO
+ help
+ Say Y here if you use a FlySky FS-i6 RC remote control along with the
+ FS-iA6B RC receiver as a joystick input device.
+
+ To compile this driver as a module, choose M here: the
+ module will be called fsia6b.
+
endif
@@ -35,4 +35,5 @@ obj-$(CONFIG_JOYSTICK_WARRIOR) += warrior.o
obj-$(CONFIG_JOYSTICK_XPAD) += xpad.o
obj-$(CONFIG_JOYSTICK_ZHENHUA) += zhenhua.o
obj-$(CONFIG_JOYSTICK_WALKERA0701) += walkera0701.o
+obj-$(CONFIG_JOYSTICK_FSIA6B) += fsia6b.o
new file mode 100644
@@ -0,0 +1,238 @@
+// SPDX-License-Identifier: GPL-2.0
+
+/*
+ * FS-iA6B iBus RC receiver driver
+ *
+ * This driver provides all 14 channels of the FlySky FS-ia6B RC receiver
+ * as analog values.
+ *
+ * Additionally, the channels can be converted to discrete switch values.
+ * By default, it is configured for the offical FS-i6 remote control.
+ * If you use a different hardware configuration, you can configure it
+ * using the `switch_config` parameter.
+ *
+ */
+
+#include <linux/device.h>
+#include <linux/input.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/serio.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+
+#define DRIVER_DESC "FS-iA6B iBus RC receiver"
+
+MODULE_AUTHOR("Markus Koch <markus@notsyncing.net>");
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");
+
+#define IBUS_SERVO_COUNT 14
+
+static char *switch_config = "00000022320000";
+module_param(switch_config, charp, 0444);
+MODULE_PARM_DESC(switch_config,
+ "Amount of switch positions per channel (14 characters, 0-3)");
+
+static int fsia6b_axes[IBUS_SERVO_COUNT] = {
+ ABS_X, ABS_Y,
+ ABS_Z, ABS_RX,
+ ABS_RY, ABS_RZ,
+ ABS_HAT0X, ABS_HAT0Y,
+ ABS_HAT1X, ABS_HAT1Y,
+ ABS_HAT2X, ABS_HAT2Y,
+ ABS_HAT3X, ABS_HAT3Y
+};
+
+enum ibus_state {SYNC, COLLECT, PROCESS};
+
+struct ibus_packet {
+ enum ibus_state state;
+
+ int offset;
+ u16 ibuf;
+ u16 channel[IBUS_SERVO_COUNT];
+};
+
+struct fsia6b {
+ struct input_dev *dev;
+ struct ibus_packet packet;
+
+ char phys[32];
+};
+
+static irqreturn_t fsia6b_serio_irq(struct serio *serio,
+ unsigned char data, unsigned int flags)
+{
+ struct fsia6b *fsia6b = serio_get_drvdata(serio);
+ int i;
+ int sw_state;
+ int sw_id = BTN_0;
+
+ fsia6b->packet.ibuf = (data << 8) | ((fsia6b->packet.ibuf >> 8) & 0xFF);
+
+ switch (fsia6b->packet.state) {
+ case SYNC:
+ if (fsia6b->packet.ibuf == 0x4020)
+ fsia6b->packet.state = COLLECT;
+ break;
+
+ case COLLECT:
+ fsia6b->packet.state = PROCESS;
+ break;
+
+ case PROCESS:
+ fsia6b->packet.channel[fsia6b->packet.offset] =
+ fsia6b->packet.ibuf;
+ fsia6b->packet.offset++;
+
+ if (fsia6b->packet.offset == IBUS_SERVO_COUNT) {
+ fsia6b->packet.offset = 0;
+ fsia6b->packet.state = SYNC;
+ for (i = 0; i < IBUS_SERVO_COUNT; ++i) {
+ input_report_abs(fsia6b->dev, fsia6b_axes[i],
+ fsia6b->packet.channel[i]);
+
+ sw_state = 0;
+ if (fsia6b->packet.channel[i] > 1900)
+ sw_state = 1;
+ else if (fsia6b->packet.channel[i] < 1100)
+ sw_state = 2;
+
+ switch (switch_config[i]) {
+ case '3':
+ input_report_key(fsia6b->dev,
+ sw_id++,
+ sw_state == 0);
+ /* fall-through */
+ case '2':
+ input_report_key(fsia6b->dev,
+ sw_id++,
+ sw_state == 1);
+ /* fall-through */
+ case '1':
+ input_report_key(fsia6b->dev,
+ sw_id++,
+ sw_state == 2);
+ }
+ }
+ input_sync(fsia6b->dev);
+ } else {
+ fsia6b->packet.state = COLLECT;
+ }
+ break;
+ }
+
+ return IRQ_HANDLED;
+}
+
+static int fsia6b_serio_connect(struct serio *serio, struct serio_driver *drv)
+{
+ struct fsia6b *fsia6b;
+ struct input_dev *input_dev;
+ int err;
+ int i, j;
+ int sw_id = 0;
+
+ fsia6b = kzalloc(sizeof(*fsia6b), GFP_KERNEL);
+ if (!fsia6b)
+ return -ENOMEM;
+
+ fsia6b->packet.ibuf = 0;
+ fsia6b->packet.offset = 0;
+ fsia6b->packet.state = SYNC;
+
+ serio_set_drvdata(serio, fsia6b);
+
+ err = serio_open(serio, drv);
+ if (err)
+ goto fail1;
+
+
+ input_dev = input_allocate_device();
+ if (!input_dev) {
+ err = -ENOMEM;
+ goto fail2;
+ }
+ fsia6b->dev = input_dev;
+
+ snprintf(fsia6b->phys, sizeof(fsia6b->phys), "%s/input0", serio->phys);
+
+ input_dev->name = DRIVER_DESC;
+ input_dev->phys = fsia6b->phys;
+ input_dev->id.bustype = BUS_RS232;
+ input_dev->id.vendor = SERIO_FSIA6B;
+ input_dev->id.product = serio->id.id;
+ input_dev->id.version = 0x0100;
+ input_dev->dev.parent = &serio->dev;
+
+ for (i = 0; i < IBUS_SERVO_COUNT; ++i) {
+ input_set_abs_params(input_dev, fsia6b_axes[i],
+ 1000, 2000, 2, 2);
+ }
+
+ // Register switch configuration
+ for (i = 0; i < IBUS_SERVO_COUNT; ++i) {
+ if (((switch_config[i] == '\0') && (i != IBUS_SERVO_COUNT)) ||
+ (switch_config[i] < '0') ||
+ (switch_config[i] > '3')) {
+ dev_err(&fsia6b->dev->dev,
+ "Invalid switch configuration supplied for fsia6b.\n");
+ err = -EINVAL;
+ goto fail3;
+ }
+
+ for (j = '1'; j <= switch_config[i]; ++j) {
+ input_set_capability(input_dev, EV_KEY, BTN_0 + sw_id);
+ sw_id++;
+ }
+
+ }
+
+ err = input_register_device(fsia6b->dev);
+ if (err)
+ goto fail3;
+
+ return 0;
+
+fail3: input_free_device(input_dev);
+fail2: serio_close(serio);
+fail1: serio_set_drvdata(serio, NULL);
+ kfree(fsia6b);
+ return err;
+}
+
+static void fsia6b_serio_disconnect(struct serio *serio)
+{
+ struct fsia6b *fsia6b = serio_get_drvdata(serio);
+
+ serio_close(serio);
+ serio_set_drvdata(serio, NULL);
+ input_unregister_device(fsia6b->dev);
+ kfree(fsia6b);
+}
+
+static const struct serio_device_id fsia6b_serio_ids[] = {
+{
+ .type = SERIO_RS232,
+ .proto = SERIO_FSIA6B,
+ .id = SERIO_ANY,
+ .extra = SERIO_ANY,
+},
+{ 0 }
+};
+
+MODULE_DEVICE_TABLE(serio, fsia6b_serio_ids);
+
+struct serio_driver fsia6b_serio_drv = {
+ .driver = {
+ .name = "fsia6b"
+ },
+ .description = DRIVER_DESC,
+ .id_table = fsia6b_serio_ids,
+ .interrupt = fsia6b_serio_irq,
+ .connect = fsia6b_serio_connect,
+ .disconnect = fsia6b_serio_disconnect
+};
+
+module_serio_driver(fsia6b_serio_drv)
@@ -82,5 +82,6 @@
#define SERIO_EGALAX 0x3f
#define SERIO_PULSE8_CEC 0x40
#define SERIO_RAINSHADOW_CEC 0x41
+#define SERIO_FSIA6B 0x42
#endif /* _UAPI_SERIO_H */
This patch adds support for the FlySky FS-iA6B RC receiver (serial IBUS). It allows the usage of the FlySky FS-i6 and other AFHDS compliant remote controls as a joystick input device. To use it, a patch to inputattach which adds the FS-iA6B as a 115200 baud serial device is required. I will upstream it after this patch is merged. More information about the hardware can be found here: https://notsyncing.net/?p=blog&b=2018.linux-fsia6b Signed-off-by: Markus Koch <markus@notsyncing.net> --- Changes in v2: Remove license boilerplate. Sorted includes. Using u16 instead of uint16_t, added corresponding include. Use sizeof(*fsia6b) instead of sizeof(struct ...). Return proper error code, and set err only on error for input_allocate_device. Use input_set_capability() intead of accessing struct directly. Thank you for your comments! MAINTAINERS | 6 + drivers/input/joystick/Kconfig | 10 ++ drivers/input/joystick/Makefile | 1 + drivers/input/joystick/fsia6b.c | 238 ++++++++++++++++++++++++++++++++ include/uapi/linux/serio.h | 1 + 5 files changed, 256 insertions(+) create mode 100644 drivers/input/joystick/fsia6b.c