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Input: add support for the FlySky FS-iA6B RC receiver
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 <[email protected]> Signed-off-by: Dmitry Torokhov <[email protected]>
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‎MAINTAINERS‎

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Original file line numberDiff line numberDiff line change
@@ -12394,6 +12394,12 @@ S: Maintained
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F: Documentation/input/devices/pxrc.rst
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F: drivers/input/joystick/pxrc.c
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FLYSKY FSIA6B RC RECEIVER
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M: Markus Koch <[email protected]>
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L: [email protected]
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S: Maintained
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F: drivers/input/joystick/fsia6b.c
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PHONET PROTOCOL
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M: Remi Denis-Courmont <[email protected]>
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S: Supported

‎drivers/input/joystick/Kconfig‎

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@@ -362,4 +362,14 @@ config JOYSTICK_PXRC
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To compile this driver as a module, choose M here: the
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module will be called pxrc.
364364

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config JOYSTICK_FSIA6B
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tristate "FlySky FS-iA6B RC Receiver"
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select SERIO
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help
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Say Y here if you use a FlySky FS-i6 RC remote control along with the
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FS-iA6B RC receiver as a joystick input device.
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To compile this driver as a module, choose M here: the
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module will be called fsia6b.
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365375
endif

‎drivers/input/joystick/Makefile‎

Lines changed: 3 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -12,6 +12,7 @@ obj-$(CONFIG_JOYSTICK_AS5011) += as5011.o
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obj-$(CONFIG_JOYSTICK_ANALOG) += analog.o
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obj-$(CONFIG_JOYSTICK_COBRA) += cobra.o
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obj-$(CONFIG_JOYSTICK_DB9) += db9.o
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obj-$(CONFIG_JOYSTICK_FSIA6B) += fsia6b.o
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obj-$(CONFIG_JOYSTICK_GAMECON) += gamecon.o
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obj-$(CONFIG_JOYSTICK_GF2K) += gf2k.o
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obj-$(CONFIG_JOYSTICK_GRIP) += grip.o
@@ -23,7 +24,7 @@ obj-$(CONFIG_JOYSTICK_JOYDUMP) += joydump.o
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obj-$(CONFIG_JOYSTICK_MAGELLAN) += magellan.o
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obj-$(CONFIG_JOYSTICK_MAPLE) += maplecontrol.o
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obj-$(CONFIG_JOYSTICK_PSXPAD_SPI) += psxpad-spi.o
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obj-$(CONFIG_JOYSTICK_PXRC) += pxrc.o
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obj-$(CONFIG_JOYSTICK_PXRC) += pxrc.o
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obj-$(CONFIG_JOYSTICK_SIDEWINDER) += sidewinder.o
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obj-$(CONFIG_JOYSTICK_SPACEBALL) += spaceball.o
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obj-$(CONFIG_JOYSTICK_SPACEORB) += spaceorb.o
@@ -32,7 +33,7 @@ obj-$(CONFIG_JOYSTICK_TMDC) += tmdc.o
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obj-$(CONFIG_JOYSTICK_TURBOGRAFX) += turbografx.o
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obj-$(CONFIG_JOYSTICK_TWIDJOY) += twidjoy.o
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obj-$(CONFIG_JOYSTICK_WARRIOR) += warrior.o
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obj-$(CONFIG_JOYSTICK_WALKERA0701) += walkera0701.o
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obj-$(CONFIG_JOYSTICK_XPAD) += xpad.o
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obj-$(CONFIG_JOYSTICK_ZHENHUA) += zhenhua.o
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obj-$(CONFIG_JOYSTICK_WALKERA0701) += walkera0701.o
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‎drivers/input/joystick/fsia6b.c‎

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Original file line numberDiff line numberDiff line change
@@ -0,0 +1,231 @@
1+
// SPDX-License-Identifier: GPL-2.0
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/*
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* FS-iA6B iBus RC receiver driver
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*
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* This driver provides all 14 channels of the FlySky FS-ia6B RC receiver
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* as analog values.
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*
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* Additionally, the channels can be converted to discrete switch values.
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* By default, it is configured for the offical FS-i6 remote control.
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* If you use a different hardware configuration, you can configure it
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* using the `switch_config` parameter.
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*/
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#include <linux/device.h>
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#include <linux/input.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/serio.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#define DRIVER_DESC "FS-iA6B iBus RC receiver"
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MODULE_AUTHOR("Markus Koch <[email protected]>");
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MODULE_DESCRIPTION(DRIVER_DESC);
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MODULE_LICENSE("GPL");
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#define IBUS_SERVO_COUNT 14
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static char *switch_config = "00000022320000";
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module_param(switch_config, charp, 0444);
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MODULE_PARM_DESC(switch_config,
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"Amount of switch positions per channel (14 characters, 0-3)");
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static int fsia6b_axes[IBUS_SERVO_COUNT] = {
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ABS_X, ABS_Y,
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ABS_Z, ABS_RX,
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ABS_RY, ABS_RZ,
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ABS_HAT0X, ABS_HAT0Y,
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ABS_HAT1X, ABS_HAT1Y,
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ABS_HAT2X, ABS_HAT2Y,
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ABS_HAT3X, ABS_HAT3Y
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};
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enum ibus_state { SYNC, COLLECT, PROCESS };
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struct ibus_packet {
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enum ibus_state state;
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int offset;
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u16 ibuf;
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u16 channel[IBUS_SERVO_COUNT];
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};
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struct fsia6b {
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struct input_dev *dev;
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struct ibus_packet packet;
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char phys[32];
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};
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static irqreturn_t fsia6b_serio_irq(struct serio *serio,
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unsigned char data, unsigned int flags)
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{
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struct fsia6b *fsia6b = serio_get_drvdata(serio);
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int i;
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int sw_state;
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int sw_id = BTN_0;
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fsia6b->packet.ibuf = (data << 8) | ((fsia6b->packet.ibuf >> 8) & 0xFF);
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switch (fsia6b->packet.state) {
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case SYNC:
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if (fsia6b->packet.ibuf == 0x4020)
75+
fsia6b->packet.state = COLLECT;
76+
break;
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case COLLECT:
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fsia6b->packet.state = PROCESS;
80+
break;
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case PROCESS:
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fsia6b->packet.channel[fsia6b->packet.offset] =
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fsia6b->packet.ibuf;
85+
fsia6b->packet.offset++;
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if (fsia6b->packet.offset == IBUS_SERVO_COUNT) {
88+
fsia6b->packet.offset = 0;
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fsia6b->packet.state = SYNC;
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for (i = 0; i < IBUS_SERVO_COUNT; ++i) {
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input_report_abs(fsia6b->dev, fsia6b_axes[i],
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fsia6b->packet.channel[i]);
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sw_state = 0;
95+
if (fsia6b->packet.channel[i] > 1900)
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sw_state = 1;
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else if (fsia6b->packet.channel[i] < 1100)
98+
sw_state = 2;
99+
100+
switch (switch_config[i]) {
101+
case '3':
102+
input_report_key(fsia6b->dev,
103+
sw_id++,
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sw_state == 0);
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/* fall-through */
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case '2':
107+
input_report_key(fsia6b->dev,
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sw_id++,
109+
sw_state == 1);
110+
/* fall-through */
111+
case '1':
112+
input_report_key(fsia6b->dev,
113+
sw_id++,
114+
sw_state == 2);
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}
116+
}
117+
input_sync(fsia6b->dev);
118+
} else {
119+
fsia6b->packet.state = COLLECT;
120+
}
121+
break;
122+
}
123+
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return IRQ_HANDLED;
125+
}
126+
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static int fsia6b_serio_connect(struct serio *serio, struct serio_driver *drv)
128+
{
129+
struct fsia6b *fsia6b;
130+
struct input_dev *input_dev;
131+
int err;
132+
int i, j;
133+
int sw_id = 0;
134+
135+
fsia6b = kzalloc(sizeof(*fsia6b), GFP_KERNEL);
136+
if (!fsia6b)
137+
return -ENOMEM;
138+
139+
fsia6b->packet.ibuf = 0;
140+
fsia6b->packet.offset = 0;
141+
fsia6b->packet.state = SYNC;
142+
143+
serio_set_drvdata(serio, fsia6b);
144+
145+
input_dev = input_allocate_device();
146+
if (!input_dev) {
147+
err = -ENOMEM;
148+
goto fail1;
149+
}
150+
fsia6b->dev = input_dev;
151+
152+
snprintf(fsia6b->phys, sizeof(fsia6b->phys), "%s/input0", serio->phys);
153+
154+
input_dev->name = DRIVER_DESC;
155+
input_dev->phys = fsia6b->phys;
156+
input_dev->id.bustype = BUS_RS232;
157+
input_dev->id.vendor = SERIO_FSIA6B;
158+
input_dev->id.product = serio->id.id;
159+
input_dev->id.version = 0x0100;
160+
input_dev->dev.parent = &serio->dev;
161+
162+
for (i = 0; i < IBUS_SERVO_COUNT; i++)
163+
input_set_abs_params(input_dev, fsia6b_axes[i],
164+
1000, 2000, 2, 2);
165+
166+
/* Register switch configuration */
167+
for (i = 0; i < IBUS_SERVO_COUNT; i++) {
168+
if (switch_config[i] < '0' || switch_config[i] > '3') {
169+
dev_err(&fsia6b->dev->dev,
170+
"Invalid switch configuration supplied for fsia6b.\n");
171+
err = -EINVAL;
172+
goto fail2;
173+
}
174+
175+
for (j = '1'; j <= switch_config[i]; j++) {
176+
input_set_capability(input_dev, EV_KEY, BTN_0 + sw_id);
177+
sw_id++;
178+
}
179+
}
180+
181+
err = serio_open(serio, drv);
182+
if (err)
183+
goto fail2;
184+
185+
err = input_register_device(fsia6b->dev);
186+
if (err)
187+
goto fail3;
188+
189+
return 0;
190+
191+
fail3: serio_close(serio);
192+
fail2: input_free_device(input_dev);
193+
fail1: serio_set_drvdata(serio, NULL);
194+
kfree(fsia6b);
195+
return err;
196+
}
197+
198+
static void fsia6b_serio_disconnect(struct serio *serio)
199+
{
200+
struct fsia6b *fsia6b = serio_get_drvdata(serio);
201+
202+
serio_close(serio);
203+
serio_set_drvdata(serio, NULL);
204+
input_unregister_device(fsia6b->dev);
205+
kfree(fsia6b);
206+
}
207+
208+
static const struct serio_device_id fsia6b_serio_ids[] = {
209+
{
210+
.type = SERIO_RS232,
211+
.proto = SERIO_FSIA6B,
212+
.id = SERIO_ANY,
213+
.extra = SERIO_ANY,
214+
},
215+
{ 0 }
216+
};
217+
218+
MODULE_DEVICE_TABLE(serio, fsia6b_serio_ids);
219+
220+
static struct serio_driver fsia6b_serio_drv = {
221+
.driver = {
222+
.name = "fsia6b"
223+
},
224+
.description = DRIVER_DESC,
225+
.id_table = fsia6b_serio_ids,
226+
.interrupt = fsia6b_serio_irq,
227+
.connect = fsia6b_serio_connect,
228+
.disconnect = fsia6b_serio_disconnect
229+
};
230+
231+
module_serio_driver(fsia6b_serio_drv)

‎include/uapi/linux/serio.h‎

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@@ -82,5 +82,6 @@
8282
#define SERIO_EGALAX 0x3f
8383
#define SERIO_PULSE8_CEC 0x40
8484
#define SERIO_RAINSHADOW_CEC 0x41
85+
#define SERIO_FSIA6B 0x42
8586

8687
#endif /* _UAPI_SERIO_H */

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