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authorYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 12:17:53 -0700
committerYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 15:44:42 -0700
commit9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch)
tree1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/drivers/input/joystick/walkera0701.c
parent98260f3884f4a202f9ca5eabed40b1354c489b29 (diff)
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/drivers/input/joystick/walkera0701.c')
-rw-r--r--kernel/drivers/input/joystick/walkera0701.c303
1 files changed, 303 insertions, 0 deletions
diff --git a/kernel/drivers/input/joystick/walkera0701.c b/kernel/drivers/input/joystick/walkera0701.c
new file mode 100644
index 000000000..b76ac5807
--- /dev/null
+++ b/kernel/drivers/input/joystick/walkera0701.c
@@ -0,0 +1,303 @@
+/*
+ * 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 pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#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 magic, magic_bit;
+ 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 */
+
+ magic = (w->buf[21] << 4) | w->buf[22];
+ magic_bit = (w->buf[24] & 8) >> 3;
+ pr_debug("%4d %4d %4d %4d %4d %4d %4d %4d (magic %2x %d)\n",
+ val1, val2, val3, val4, val5, val6, val7, val8,
+ magic, magic_bit);
+
+ 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);
+
+ if (parport_claim(w->pardevice))
+ return -EBUSY;
+
+ 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);
+ hrtimer_cancel(&w->timer);
+
+ parport_release(w->pardevice);
+}
+
+static int walkera0701_connect(struct walkera_dev *w, int parport)
+{
+ int error;
+
+ w->parport = parport_find_number(parport);
+ if (!w->parport) {
+ pr_err("parport %d does not exist\n", parport);
+ return -ENODEV;
+ }
+
+ if (w->parport->irq == -1) {
+ pr_err("parport %d does not have interrupt assigned\n",
+ parport);
+ error = -EINVAL;
+ goto err_put_parport;
+ }
+
+ w->pardevice = parport_register_device(w->parport, "walkera0701",
+ NULL, NULL, walkera0701_irq_handler,
+ PARPORT_DEV_EXCL, w);
+ if (!w->pardevice) {
+ pr_err("failed to register parport device\n");
+ error = -EIO;
+ goto err_put_parport;
+ }
+
+ if (parport_negotiate(w->pardevice->port, IEEE1284_MODE_COMPAT)) {
+ pr_err("failed to negotiate parport mode\n");
+ error = -EIO;
+ goto err_unregister_device;
+ }
+
+ hrtimer_init(&w->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
+ w->timer.function = timer_handler;
+
+ w->input_dev = input_allocate_device();
+ if (!w->input_dev) {
+ pr_err("failed to allocate input device\n");
+ error = -ENOMEM;
+ goto err_unregister_device;
+ }
+
+ 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->dev.parent = w->parport->dev;
+ 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);
+
+ error = input_register_device(w->input_dev);
+ if (error) {
+ pr_err("failed to register input device\n");
+ goto err_free_input_dev;
+ }
+
+ return 0;
+
+err_free_input_dev:
+ input_free_device(w->input_dev);
+err_unregister_device:
+ parport_unregister_device(w->pardevice);
+err_put_parport:
+ parport_put_port(w->parport);
+ return error;
+}
+
+static void walkera0701_disconnect(struct walkera_dev *w)
+{
+ input_unregister_device(w->input_dev);
+ 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);