Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
diff --git a/drivers/usb/input/pid.c b/drivers/usb/input/pid.c
new file mode 100644
index 0000000..2569638
--- /dev/null
+++ b/drivers/usb/input/pid.c
@@ -0,0 +1,295 @@
+/*
+ * PID Force feedback support for hid devices.
+ *
+ * Copyright (c) 2002 Rodrigo Damazio.
+ * Portions by Johann Deneux and Bjorn Augustson
+ */
+
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * Should you need to contact me, the author, you can do so by
+ * e-mail - mail your message to <rdamazio@lsi.usp.br>
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/mm.h>
+#include <linux/smp_lock.h>
+#include <linux/spinlock.h>
+#include <linux/input.h>
+#include <linux/usb.h>
+#include "hid.h"
+#include "pid.h"
+
+#define DEBUG
+
+#define CHECK_OWNERSHIP(i, hid_pid) \
+ ((i) < FF_EFFECTS_MAX && i >= 0 && \
+ test_bit(FF_PID_FLAGS_USED, &hid_pid->effects[(i)].flags) && \
+ (current->pid == 0 || \
+ (hid_pid)->effects[(i)].owner == current->pid))
+
+/* Called when a transfer is completed */
+static void hid_pid_ctrl_out(struct urb *u, struct pt_regs *regs)
+{
+ dev_dbg(&u->dev->dev, "hid_pid_ctrl_out - Transfer Completed\n");
+}
+
+static void hid_pid_exit(struct hid_device *hid)
+{
+ struct hid_ff_pid *private = hid->ff_private;
+
+ if (private->urbffout) {
+ usb_kill_urb(private->urbffout);
+ usb_free_urb(private->urbffout);
+ }
+}
+
+static int pid_upload_periodic(struct hid_ff_pid *pid, struct ff_effect *effect, int is_update)
+{
+ dev_info(&pid->hid->dev->dev, "requested periodic force upload\n");
+ return 0;
+}
+
+static int pid_upload_constant(struct hid_ff_pid *pid, struct ff_effect *effect, int is_update)
+{
+ dev_info(&pid->hid->dev->dev, "requested constant force upload\n");
+ return 0;
+}
+
+static int pid_upload_condition(struct hid_ff_pid *pid, struct ff_effect *effect, int is_update)
+{
+ dev_info(&pid->hid->dev->dev, "requested Condition force upload\n");
+ return 0;
+}
+
+static int pid_upload_ramp(struct hid_ff_pid *pid, struct ff_effect *effect, int is_update)
+{
+ dev_info(&pid->hid->dev->dev, "request ramp force upload\n");
+ return 0;
+}
+
+static int hid_pid_event(struct hid_device *hid, struct input_dev *input,
+ unsigned int type, unsigned int code, int value)
+{
+ dev_dbg(&hid->dev->dev, "PID event received: type=%d,code=%d,value=%d.\n", type, code, value);
+
+ if (type != EV_FF)
+ return -1;
+
+ return 0;
+}
+
+/* Lock must be held by caller */
+static void hid_pid_ctrl_playback(struct hid_device *hid, struct hid_pid_effect *effect, int play)
+{
+ if (play)
+ set_bit(FF_PID_FLAGS_PLAYING, &effect->flags);
+ else
+ clear_bit(FF_PID_FLAGS_PLAYING, &effect->flags);
+}
+
+static int hid_pid_erase(struct input_dev *dev, int id)
+{
+ struct hid_device *hid = dev->private;
+ struct hid_ff_pid *pid = hid->ff_private;
+ struct hid_field *field;
+ unsigned long flags;
+ int ret;
+
+ if (!CHECK_OWNERSHIP(id, pid))
+ return -EACCES;
+
+ /* Find report */
+ field = hid_find_field_by_usage(hid, HID_UP_PID | FF_PID_USAGE_BLOCK_FREE,
+ HID_OUTPUT_REPORT);
+ if (!field) {
+ dev_err(&hid->dev->dev, "couldn't find report\n");
+ return -EIO;
+ }
+
+ ret = hid_set_field(field, 0, pid->effects[id].device_id);
+ if (ret) {
+ dev_err(&hid->dev->dev, "couldn't set field\n");
+ return ret;
+ }
+
+ hid_submit_report(hid, field->report, USB_DIR_OUT);
+
+ spin_lock_irqsave(&pid->lock, flags);
+ hid_pid_ctrl_playback(hid, pid->effects + id, 0);
+ pid->effects[id].flags = 0;
+ spin_unlock_irqrestore(&pid->lock, flags);
+
+ return 0;
+}
+
+/* Erase all effects this process owns */
+static int hid_pid_flush(struct input_dev *dev, struct file *file)
+{
+ struct hid_device *hid = dev->private;
+ struct hid_ff_pid *pid = hid->ff_private;
+ int i;
+
+ /*NOTE: no need to lock here. The only times EFFECT_USED is
+ modified is when effects are uploaded or when an effect is
+ erased. But a process cannot close its dev/input/eventX fd
+ and perform ioctls on the same fd all at the same time */
+ /*FIXME: multiple threads, anyone? */
+ for (i = 0; i < dev->ff_effects_max; ++i)
+ if (current->pid == pid->effects[i].owner
+ && test_bit(FF_PID_FLAGS_USED, &pid->effects[i].flags))
+ if (hid_pid_erase(dev, i))
+ dev_warn(&hid->dev->dev, "erase effect %d failed", i);
+
+ return 0;
+}
+
+static int hid_pid_upload_effect(struct input_dev *dev,
+ struct ff_effect *effect)
+{
+ struct hid_ff_pid *pid_private = (struct hid_ff_pid *)(dev->private);
+ int ret;
+ int is_update;
+ unsigned long flags;
+
+ dev_dbg(&pid_private->hid->dev->dev, "upload effect called: effect_type=%x\n", effect->type);
+ /* Check this effect type is supported by this device */
+ if (!test_bit(effect->type, dev->ffbit)) {
+ dev_dbg(&pid_private->hid->dev->dev,
+ "invalid kind of effect requested.\n");
+ return -EINVAL;
+ }
+
+ /*
+ * If we want to create a new effect, get a free id
+ */
+ if (effect->id == -1) {
+ int id = 0;
+
+ // Spinlock so we don`t get a race condition when choosing IDs
+ spin_lock_irqsave(&pid_private->lock, flags);
+
+ while (id < FF_EFFECTS_MAX)
+ if (!test_and_set_bit(FF_PID_FLAGS_USED, &pid_private->effects[id++].flags))
+ break;
+
+ if (id == FF_EFFECTS_MAX) {
+ spin_unlock_irqrestore(&pid_private->lock, flags);
+// TEMP - We need to get ff_effects_max correctly first: || id >= dev->ff_effects_max) {
+ dev_dbg(&pid_private->hid->dev->dev, "Not enough device memory\n");
+ return -ENOMEM;
+ }
+
+ effect->id = id;
+ dev_dbg(&pid_private->hid->dev->dev, "effect ID is %d\n.", id);
+ pid_private->effects[id].owner = current->pid;
+ pid_private->effects[id].flags = (1 << FF_PID_FLAGS_USED);
+ spin_unlock_irqrestore(&pid_private->lock, flags);
+
+ is_update = FF_PID_FALSE;
+ } else {
+ /* We want to update an effect */
+ if (!CHECK_OWNERSHIP(effect->id, pid_private))
+ return -EACCES;
+
+ /* Parameter type cannot be updated */
+ if (effect->type != pid_private->effects[effect->id].effect.type)
+ return -EINVAL;
+
+ /* Check the effect is not already being updated */
+ if (test_bit(FF_PID_FLAGS_UPDATING, &pid_private->effects[effect->id].flags))
+ return -EAGAIN;
+
+ is_update = FF_PID_TRUE;
+ }
+
+ /*
+ * Upload the effect
+ */
+ switch (effect->type) {
+ case FF_PERIODIC:
+ ret = pid_upload_periodic(pid_private, effect, is_update);
+ break;
+
+ case FF_CONSTANT:
+ ret = pid_upload_constant(pid_private, effect, is_update);
+ break;
+
+ case FF_SPRING:
+ case FF_FRICTION:
+ case FF_DAMPER:
+ case FF_INERTIA:
+ ret = pid_upload_condition(pid_private, effect, is_update);
+ break;
+
+ case FF_RAMP:
+ ret = pid_upload_ramp(pid_private, effect, is_update);
+ break;
+
+ default:
+ dev_dbg(&pid_private->hid->dev->dev,
+ "invalid type of effect requested - %x.\n",
+ effect->type);
+ return -EINVAL;
+ }
+ /* If a packet was sent, forbid new updates until we are notified
+ * that the packet was updated
+ */
+ if (ret == 0)
+ set_bit(FF_PID_FLAGS_UPDATING, &pid_private->effects[effect->id].flags);
+ pid_private->effects[effect->id].effect = *effect;
+ return ret;
+}
+
+int hid_pid_init(struct hid_device *hid)
+{
+ struct hid_ff_pid *private;
+ struct hid_input *hidinput = list_entry(&hid->inputs, struct hid_input, list);
+
+ private = hid->ff_private = kcalloc(1, sizeof(struct hid_ff_pid), GFP_KERNEL);
+ if (!private)
+ return -ENOMEM;
+
+ private->hid = hid;
+
+ hid->ff_exit = hid_pid_exit;
+ hid->ff_event = hid_pid_event;
+
+ /* Open output URB */
+ if (!(private->urbffout = usb_alloc_urb(0, GFP_KERNEL))) {
+ kfree(private);
+ return -1;
+ }
+
+ usb_fill_control_urb(private->urbffout, hid->dev, 0,
+ (void *)&private->ffcr, private->ctrl_buffer, 8,
+ hid_pid_ctrl_out, hid);
+ hidinput->input.upload_effect = hid_pid_upload_effect;
+ hidinput->input.flush = hid_pid_flush;
+ hidinput->input.ff_effects_max = 8; // A random default
+ set_bit(EV_FF, hidinput->input.evbit);
+ set_bit(EV_FF_STATUS, hidinput->input.evbit);
+
+ spin_lock_init(&private->lock);
+
+ printk(KERN_INFO "Force feedback driver for PID devices by Rodrigo Damazio <rdamazio@lsi.usp.br>.\n");
+
+ return 0;
+}