From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sat, 16 Apr 2005 15:20:36 -0700 Subject: 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! --- drivers/usb/input/pid.c | 295 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 295 insertions(+) create mode 100644 drivers/usb/input/pid.c (limited to 'drivers/usb/input/pid.c') diff --git a/drivers/usb/input/pid.c b/drivers/usb/input/pid.c new file mode 100644 index 00000000000..25696386347 --- /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 + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#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 .\n"); + + return 0; +} -- cgit v1.2.3