Input: add joystick driver for Walkera WK-0701 RC transmitter

Signed-off-by: Peter Popovec <popovec@fei.tuke.sk>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

4 files changed, 414 insertions, 0 deletions

diff --git a/Documentation/input/walkera0701.txt b/Documentation/input/walkera0701.txt
new file mode 100644
index 000000000000..8f4289efc5c4
--- /dev/null
+++ b/Documentation/input/walkera0701.txt
@@ -0,0 +1,109 @@
+
+Walkera WK-0701 transmitter is supplied with a ready to fly Walkera
+helicopters such as HM36, HM37, HM60. The walkera0701 module enables to use
+this transmitter as joystick
+
+Devel homepage and download:
+http://zub.fei.tuke.sk/walkera-wk0701/
+
+or use cogito:
+cg-clone http://zub.fei.tuke.sk/GIT/walkera0701-joystick
+
+
+Connecting to PC:
+
+At back side of transmitter S-video connector can be found. Modulation
+pulses from processor to HF part can be found at pin 2 of this connector,
+pin 3 is GND. Between pin 3 and CPU 5k6 resistor can be found. To get
+modulation pulses to PC, signal pulses must be amplified.
+
+Cable: (walkera TX to parport)
+
+Walkera WK-0701 TX S-VIDEO connector:
+ (back side of TX)
+     __   __              S-video:                                  canon25
+    /  |_|  \             pin 2 (signal)              NPN           parport
+   / O 4 3 O \            pin 3 (GND)        LED        ________________  10 ACK
+  ( O 2   1 O )                                         | C
+   \   ___   /      2 ________________________|\|_____|/
+    | [___] |                                 |/|   B |\
+     -------        3 __________________________________|________________ 25 GND
+                                                          E
+
+
+I use green LED and BC109 NPN transistor.
+
+Software:
+
+Build kernel with walkera0701 module. Module walkera0701 need exclusive
+access to parport, modules like lp must be unloaded before loading
+walkera0701 module, check dmesg for error messages. Connect TX to PC by
+cable and run jstest /dev/input/js0 to see values from TX. If no value can
+be changed by TX "joystick", check output from /proc/interrupts. Value for
+(usually irq7) parport must increase if TX is on.
+
+
+
+Technical details:
+
+Driver use interrupt from parport ACK input bit to measure pulse length
+using hrtimers.
+
+Frame format:
+Based on walkera WK-0701 PCM Format description by Shaul Eizikovich.
+(downloaded from http://www.smartpropoplus.com/Docs/Walkera_Wk-0701_PCM.pdf)
+
+Signal pulses:
+                   (ANALOG)
+    SYNC      BIN   OCT
+  +---------+      +------+
+  |         |      |      |
+--+         +------+      +---
+
+Frame:
+ SYNC , BIN1, OCT1, BIN2, OCT2 ... BIN24, OCT24, BIN25, next frame SYNC ..
+
+pulse length:
+   Binary values:               Analog octal values:
+
+   288 uS Binary 0              318 uS       000
+   438 uS Binary 1              398 uS       001
+                                478 uS       010
+                                558 uS       011
+                                638 uS       100
+  1306 uS SYNC                  718 uS       101
+                                798 uS       110
+                                878 uS       111
+
+24 bin+oct values + 1 bin value = 24*4+1 bits  = 97 bits
+
+(Warning, pulses on ACK ar inverted by transistor, irq is rised up on sync
+to bin change or octal value to bin change).
+
+Binary data representations:
+
+One binary and octal value can be grouped to nibble. 24 nibbles + one binary
+values can be sampled between sync pulses.
+
+Values for first four channels (analog joystick values) can be found in
+first 10 nibbles. Analog value is represented by one sign bit and 9 bit
+absolute binary value. (10 bits per channel). Next nibble is checksum for
+first ten nibbles.
+
+Next nibbles 12 .. 21 represents four channels (not all channels can be
+directly controlled from TX). Binary representations ar the same as in first
+four channels. In nibbles 22 and 23 is a special magic number. Nibble 24 is
+checksum for nibbles 12..23.
+
+After last octal value for nibble 24 and next sync pulse one additional
+binary value can be sampled. This bit and magic number is not used in
+software driver. Some details about this magic numbers can be found in
+Walkera_Wk-0701_PCM.pdf.
+
+Checksum calculation:
+
+Summary of octal values in nibbles must be same as octal value in checksum
+nibble (only first 3 bits are used). Binary value for checksum nibble is
+calculated by sum of binary values in checked nibbles + sum of octal values
+in checked nibbles divided by 8. Only bit 0 of this sum is used.
+
diff --git a/drivers/input/joystick/Kconfig b/drivers/input/joystick/Kconfig
index be5c14a5a0a4..268dd3fef0ab 100644
--- a/drivers/input/joystick/Kconfig
+++ b/drivers/input/joystick/Kconfig
@@ -294,4 +294,16 @@ config JOYSTICK_XPAD_LEDS
           This option enables support for the LED which surrounds the Big X on
           XBox 360 controller.
 
+config JOYSTICK_WALKERA0701
+        tristate "Walkera WK-0701 RC transmitter"
+        depends on HIGH_RES_TIMERS && PARPORT
+        help
+          Say Y or M here if you have a Walkera WK-0701 transmitter which is
+          supplied with a ready to fly Walkera helicopters such as HM36,
+          HM37, HM60 and want to use it via parport as a joystick. More
+          information is available: <file:Documentation/input/walkera0701.txt>
+
+          To compile this driver as a module, choose M here: the
+          module will be called walkera0701.
+
 endif
diff --git a/drivers/input/joystick/Makefile b/drivers/input/joystick/Makefile
index fdbf8c4c2876..723036295685 100644
--- a/drivers/input/joystick/Makefile
+++ b/drivers/input/joystick/Makefile
@@ -29,4 +29,5 @@ obj-$(CONFIG_JOYSTICK_TWIDJOY)		+= twidjoy.o
 obj-$(CONFIG_JOYSTICK_WARRIOR)          += warrior.o
 obj-$(CONFIG_JOYSTICK_XPAD)             += xpad.o
 obj-$(CONFIG_JOYSTICK_ZHENHUA)          += zhenhua.o
+obj-$(CONFIG_JOYSTICK_WALKERA0701)      += walkera0701.o
 
diff --git a/drivers/input/joystick/walkera0701.c b/drivers/input/joystick/walkera0701.c
new file mode 100644
index 000000000000..4dfa1eed4b7c
--- /dev/null
+++ b/drivers/input/joystick/walkera0701.c
@@ -0,0 +1,292 @@
+/*
+ *  Parallel port to Walkera WK-0701 TX joystick
+ *
+ *  Copyright (c) 2008 Peter Popovec
+ *
+ *  More about driver:  <file:Documentation/input/walkera0701.txt>
+ */
+
+/*
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+*/
+
+/* #define WK0701_DEBUG */
+
+#define RESERVE 20000
+#define SYNC_PULSE 1306000
+#define BIN0_PULSE 288000
+#define BIN1_PULSE 438000
+
+#define ANALOG_MIN_PULSE 318000
+#define ANALOG_MAX_PULSE 878000
+#define ANALOG_DELTA 80000
+
+#define BIN_SAMPLE ((BIN0_PULSE + BIN1_PULSE) / 2)
+
+#define NO_SYNC 25
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/parport.h>
+#include <linux/input.h>
+#include <linux/hrtimer.h>
+
+MODULE_AUTHOR("Peter Popovec <popovec@fei.tuke.sk>");
+MODULE_DESCRIPTION("Walkera WK-0701 TX as joystick");
+MODULE_LICENSE("GPL");
+
+static unsigned int walkera0701_pp_no;
+module_param_named(port, walkera0701_pp_no, int, 0);
+MODULE_PARM_DESC(port,
+                 "Parallel port adapter for Walkera WK-0701 TX (default is 0)");
+
+/*
+ * For now, only one device is supported, if somebody need more devices, code
+ * can be expanded, one struct walkera_dev per device must be allocated and
+ * set up by walkera0701_connect (release of device by walkera0701_disconnect)
+ */
+
+struct walkera_dev {
+        unsigned char buf[25];
+        u64 irq_time, irq_lasttime;
+        int counter;
+        int ack;
+
+        struct input_dev *input_dev;
+        struct hrtimer timer;
+
+        struct parport *parport;
+        struct pardevice *pardevice;
+};
+
+static struct walkera_dev w_dev;
+
+static inline void walkera0701_parse_frame(struct walkera_dev *w)
+{
+        int i;
+        int val1, val2, val3, val4, val5, val6, val7, val8;
+        int crc1, crc2;
+
+        for (crc1 = crc2 = i = 0; i < 10; i++) {
+                crc1 += w->buf[i] & 7;
+                crc2 += (w->buf[i] & 8) >> 3;
+        }
+        if ((w->buf[10] & 7) != (crc1 & 7))
+                return;
+        if (((w->buf[10] & 8) >> 3) != (((crc1 >> 3) + crc2) & 1))
+                return;
+        for (crc1 = crc2 = 0, i = 11; i < 23; i++) {
+                crc1 += w->buf[i] & 7;
+                crc2 += (w->buf[i] & 8) >> 3;
+        }
+        if ((w->buf[23] & 7) != (crc1 & 7))
+                return;
+        if (((w->buf[23] & 8) >> 3) != (((crc1 >> 3) + crc2) & 1))
+                return;
+        val1 = ((w->buf[0] & 7) * 256 + w->buf[1] * 16 + w->buf[2]) >> 2;
+        val1 *= ((w->buf[0] >> 2) & 2) - 1;     /* sign */
+        val2 = (w->buf[2] & 1) << 8 | (w->buf[3] << 4) | w->buf[4];
+        val2 *= (w->buf[2] & 2) - 1;    /* sign */
+        val3 = ((w->buf[5] & 7) * 256 + w->buf[6] * 16 + w->buf[7]) >> 2;
+        val3 *= ((w->buf[5] >> 2) & 2) - 1;     /* sign */
+        val4 = (w->buf[7] & 1) << 8 | (w->buf[8] << 4) | w->buf[9];
+        val4 *= (w->buf[7] & 2) - 1;    /* sign */
+        val5 = ((w->buf[11] & 7) * 256 + w->buf[12] * 16 + w->buf[13]) >> 2;
+        val5 *= ((w->buf[11] >> 2) & 2) - 1;    /* sign */
+        val6 = (w->buf[13] & 1) << 8 | (w->buf[14] << 4) | w->buf[15];
+        val6 *= (w->buf[13] & 2) - 1;   /* sign */
+        val7 = ((w->buf[16] & 7) * 256 + w->buf[17] * 16 + w->buf[18]) >> 2;
+        val7 *= ((w->buf[16] >> 2) & 2) - 1;    /*sign */
+        val8 = (w->buf[18] & 1) << 8 | (w->buf[19] << 4) | w->buf[20];
+        val8 *= (w->buf[18] & 2) - 1;   /*sign */
+
+#ifdef WK0701_DEBUG
+        {
+                int magic, magic_bit;
+                magic = (w->buf[21] << 4) | w->buf[22];
+                magic_bit = (w->buf[24] & 8) >> 3;
+                printk(KERN_DEBUG
+                       "walkera0701: %4d %4d %4d %4d  %4d %4d %4d %4d (magic %2x %d)\n",
+                       val1, val2, val3, val4, val5, val6, val7, val8, magic,
+                       magic_bit);
+        }
+#endif
+        input_report_abs(w->input_dev, ABS_X, val2);
+        input_report_abs(w->input_dev, ABS_Y, val1);
+        input_report_abs(w->input_dev, ABS_Z, val6);
+        input_report_abs(w->input_dev, ABS_THROTTLE, val3);
+        input_report_abs(w->input_dev, ABS_RUDDER, val4);
+        input_report_abs(w->input_dev, ABS_MISC, val7);
+        input_report_key(w->input_dev, BTN_GEAR_DOWN, val5 > 0);
+}
+
+static inline int read_ack(struct pardevice *p)
+{
+        return parport_read_status(p->port) & 0x40;
+}
+
+/* falling edge, prepare to BIN value calculation */
+static void walkera0701_irq_handler(void *handler_data)
+{
+        u64 pulse_time;
+        struct walkera_dev *w = handler_data;
+
+        w->irq_time = ktime_to_ns(ktime_get());
+        pulse_time = w->irq_time - w->irq_lasttime;
+        w->irq_lasttime = w->irq_time;
+
+        /* cancel timer, if in handler or active do resync */
+        if (unlikely(0 != hrtimer_try_to_cancel(&w->timer))) {
+                w->counter = NO_SYNC;
+                return;
+        }
+
+        if (w->counter < NO_SYNC) {
+                if (w->ack) {
+                        pulse_time -= BIN1_PULSE;
+                        w->buf[w->counter] = 8;
+                } else {
+                        pulse_time -= BIN0_PULSE;
+                        w->buf[w->counter] = 0;
+                }
+                if (w->counter == 24) { /* full frame */
+                        walkera0701_parse_frame(w);
+                        w->counter = NO_SYNC;
+                        if (abs(pulse_time - SYNC_PULSE) < RESERVE)     /* new frame sync */
+                                w->counter = 0;
+                } else {
+                        if ((pulse_time > (ANALOG_MIN_PULSE - RESERVE)
+                             && (pulse_time < (ANALOG_MAX_PULSE + RESERVE)))) {
+                                pulse_time -= (ANALOG_MIN_PULSE - RESERVE);
+                                pulse_time = (u32) pulse_time / ANALOG_DELTA;   /* overtiping is safe, pulsetime < s32.. */
+                                w->buf[w->counter++] |= (pulse_time & 7);
+                        } else
+                                w->counter = NO_SYNC;
+                }
+        } else if (abs(pulse_time - SYNC_PULSE - BIN0_PULSE) <
+                                RESERVE + BIN1_PULSE - BIN0_PULSE)      /* frame sync .. */
+                w->counter = 0;
+
+        hrtimer_start(&w->timer, ktime_set(0, BIN_SAMPLE), HRTIMER_MODE_REL);
+}
+
+static enum hrtimer_restart timer_handler(struct hrtimer
+                                          *handle)
+{
+        struct walkera_dev *w;
+
+        w = container_of(handle, struct walkera_dev, timer);
+        w->ack = read_ack(w->pardevice);
+
+        return HRTIMER_NORESTART;
+}
+
+static int walkera0701_open(struct input_dev *dev)
+{
+        struct walkera_dev *w = input_get_drvdata(dev);
+
+        parport_enable_irq(w->parport);
+        return 0;
+}
+
+static void walkera0701_close(struct input_dev *dev)
+{
+        struct walkera_dev *w = input_get_drvdata(dev);
+
+        parport_disable_irq(w->parport);
+}
+
+static int walkera0701_connect(struct walkera_dev *w, int parport)
+{
+        int err = -ENODEV;
+
+        w->parport = parport_find_number(parport);
+        if (w->parport == NULL)
+                return -ENODEV;
+
+        if (w->parport->irq == -1) {
+                printk(KERN_ERR "walkera0701: parport without interrupt\n");
+                goto init_err;
+        }
+
+        err = -EBUSY;
+        w->pardevice = parport_register_device(w->parport, "walkera0701",
+                                    NULL, NULL, walkera0701_irq_handler,
+                                    PARPORT_DEV_EXCL, w);
+        if (!w->pardevice)
+                goto init_err;
+
+        if (parport_negotiate(w->pardevice->port, IEEE1284_MODE_COMPAT))
+                goto init_err1;
+
+        if (parport_claim(w->pardevice))
+                goto init_err1;
+
+        w->input_dev = input_allocate_device();
+        if (!w->input_dev)
+                goto init_err2;
+
+        input_set_drvdata(w->input_dev, w);
+        w->input_dev->name = "Walkera WK-0701 TX";
+        w->input_dev->phys = w->parport->name;
+        w->input_dev->id.bustype = BUS_PARPORT;
+
+        /* TODO what id vendor/product/version ? */
+        w->input_dev->id.vendor = 0x0001;
+        w->input_dev->id.product = 0x0001;
+        w->input_dev->id.version = 0x0100;
+        w->input_dev->open = walkera0701_open;
+        w->input_dev->close = walkera0701_close;
+
+        w->input_dev->evbit[0] = BIT(EV_ABS) | BIT_MASK(EV_KEY);
+        w->input_dev->keybit[BIT_WORD(BTN_GEAR_DOWN)] = BIT_MASK(BTN_GEAR_DOWN);
+
+        input_set_abs_params(w->input_dev, ABS_X, -512, 512, 0, 0);
+        input_set_abs_params(w->input_dev, ABS_Y, -512, 512, 0, 0);
+        input_set_abs_params(w->input_dev, ABS_Z, -512, 512, 0, 0);
+        input_set_abs_params(w->input_dev, ABS_THROTTLE, -512, 512, 0, 0);
+        input_set_abs_params(w->input_dev, ABS_RUDDER, -512, 512, 0, 0);
+        input_set_abs_params(w->input_dev, ABS_MISC, -512, 512, 0, 0);
+
+        err = input_register_device(w->input_dev);
+        if (err)
+                goto init_err3;
+
+        hrtimer_init(&w->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
+        w->timer.function = timer_handler;
+        return 0;
+
+ init_err3:
+        input_free_device(w->input_dev);
+ init_err2:
+        parport_release(w->pardevice);
+ init_err1:
+        parport_unregister_device(w->pardevice);
+ init_err:
+        parport_put_port(w->parport);
+        return err;
+}
+
+static void walkera0701_disconnect(struct walkera_dev *w)
+{
+        hrtimer_cancel(&w->timer);
+        input_unregister_device(w->input_dev);
+        parport_release(w->pardevice);
+        parport_unregister_device(w->pardevice);
+        parport_put_port(w->parport);
+}
+
+static int __init walkera0701_init(void)
+{
+        return walkera0701_connect(&w_dev, walkera0701_pp_no);
+}
+
+static void __exit walkera0701_exit(void)
+{
+        walkera0701_disconnect(&w_dev);
+}
+
+module_init(walkera0701_init);
+module_exit(walkera0701_exit);