Linux-2.6.12-rc2v2.6.12-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!

1 files changed, 295 insertions, 0 deletions

diff --git a/drivers/usb/input/pid.c b/drivers/usb/input/pid.c
new file mode 100644
index 000000000000..256963863478
--- /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;
+}