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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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c5b7c7c395
Input: convert drivers/iusb/input to dynamic input_dev allocation This is required for input_dev sysfs integration Signed-off-by: Dmitry Torokhov <dtor@mail.ru> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
298 lines
8.2 KiB
C
298 lines
8.2 KiB
C
/*
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* PID Force feedback support for hid devices.
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*
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* Copyright (c) 2002 Rodrigo Damazio.
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* Portions by Johann Deneux and Bjorn Augustson
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*/
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/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Should you need to contact me, the author, you can do so by
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* e-mail - mail your message to <rdamazio@lsi.usp.br>
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*/
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#include <linux/config.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/mm.h>
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#include <linux/smp_lock.h>
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#include <linux/spinlock.h>
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#include <linux/input.h>
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#include <linux/usb.h>
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#include "hid.h"
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#include "pid.h"
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#define DEBUG
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#define CHECK_OWNERSHIP(i, hid_pid) \
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((i) < FF_EFFECTS_MAX && i >= 0 && \
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test_bit(FF_PID_FLAGS_USED, &hid_pid->effects[(i)].flags) && \
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(current->pid == 0 || \
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(hid_pid)->effects[(i)].owner == current->pid))
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/* Called when a transfer is completed */
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static void hid_pid_ctrl_out(struct urb *u, struct pt_regs *regs)
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{
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dev_dbg(&u->dev->dev, "hid_pid_ctrl_out - Transfer Completed\n");
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}
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static void hid_pid_exit(struct hid_device *hid)
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{
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struct hid_ff_pid *private = hid->ff_private;
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if (private->urbffout) {
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usb_kill_urb(private->urbffout);
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usb_free_urb(private->urbffout);
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}
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}
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static int pid_upload_periodic(struct hid_ff_pid *pid, struct ff_effect *effect, int is_update)
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{
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dev_info(&pid->hid->dev->dev, "requested periodic force upload\n");
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return 0;
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}
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static int pid_upload_constant(struct hid_ff_pid *pid, struct ff_effect *effect, int is_update)
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{
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dev_info(&pid->hid->dev->dev, "requested constant force upload\n");
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return 0;
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}
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static int pid_upload_condition(struct hid_ff_pid *pid, struct ff_effect *effect, int is_update)
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{
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dev_info(&pid->hid->dev->dev, "requested Condition force upload\n");
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return 0;
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}
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static int pid_upload_ramp(struct hid_ff_pid *pid, struct ff_effect *effect, int is_update)
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{
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dev_info(&pid->hid->dev->dev, "request ramp force upload\n");
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return 0;
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}
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static int hid_pid_event(struct hid_device *hid, struct input_dev *input,
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unsigned int type, unsigned int code, int value)
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{
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dev_dbg(&hid->dev->dev, "PID event received: type=%d,code=%d,value=%d.\n", type, code, value);
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if (type != EV_FF)
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return -1;
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return 0;
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}
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/* Lock must be held by caller */
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static void hid_pid_ctrl_playback(struct hid_device *hid, struct hid_pid_effect *effect, int play)
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{
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if (play)
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set_bit(FF_PID_FLAGS_PLAYING, &effect->flags);
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else
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clear_bit(FF_PID_FLAGS_PLAYING, &effect->flags);
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}
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static int hid_pid_erase(struct input_dev *dev, int id)
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{
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struct hid_device *hid = dev->private;
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struct hid_ff_pid *pid = hid->ff_private;
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struct hid_field *field;
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unsigned long flags;
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int ret;
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if (!CHECK_OWNERSHIP(id, pid))
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return -EACCES;
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/* Find report */
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field = hid_find_field_by_usage(hid, HID_UP_PID | FF_PID_USAGE_BLOCK_FREE,
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HID_OUTPUT_REPORT);
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if (!field) {
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dev_err(&hid->dev->dev, "couldn't find report\n");
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return -EIO;
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}
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ret = hid_set_field(field, 0, pid->effects[id].device_id);
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if (ret) {
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dev_err(&hid->dev->dev, "couldn't set field\n");
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return ret;
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}
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hid_submit_report(hid, field->report, USB_DIR_OUT);
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spin_lock_irqsave(&pid->lock, flags);
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hid_pid_ctrl_playback(hid, pid->effects + id, 0);
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pid->effects[id].flags = 0;
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spin_unlock_irqrestore(&pid->lock, flags);
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return 0;
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}
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/* Erase all effects this process owns */
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static int hid_pid_flush(struct input_dev *dev, struct file *file)
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{
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struct hid_device *hid = dev->private;
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struct hid_ff_pid *pid = hid->ff_private;
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int i;
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/*NOTE: no need to lock here. The only times EFFECT_USED is
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modified is when effects are uploaded or when an effect is
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erased. But a process cannot close its dev/input/eventX fd
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and perform ioctls on the same fd all at the same time */
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/*FIXME: multiple threads, anyone? */
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for (i = 0; i < dev->ff_effects_max; ++i)
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if (current->pid == pid->effects[i].owner
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&& test_bit(FF_PID_FLAGS_USED, &pid->effects[i].flags))
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if (hid_pid_erase(dev, i))
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dev_warn(&hid->dev->dev, "erase effect %d failed", i);
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return 0;
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}
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static int hid_pid_upload_effect(struct input_dev *dev,
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struct ff_effect *effect)
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{
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struct hid_ff_pid *pid_private = (struct hid_ff_pid *)(dev->private);
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int ret;
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int is_update;
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unsigned long flags;
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dev_dbg(&pid_private->hid->dev->dev, "upload effect called: effect_type=%x\n", effect->type);
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/* Check this effect type is supported by this device */
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if (!test_bit(effect->type, dev->ffbit)) {
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dev_dbg(&pid_private->hid->dev->dev,
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"invalid kind of effect requested.\n");
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return -EINVAL;
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}
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/*
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* If we want to create a new effect, get a free id
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*/
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if (effect->id == -1) {
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int id = 0;
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// Spinlock so we don`t get a race condition when choosing IDs
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spin_lock_irqsave(&pid_private->lock, flags);
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while (id < FF_EFFECTS_MAX)
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if (!test_and_set_bit(FF_PID_FLAGS_USED, &pid_private->effects[id++].flags))
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break;
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if (id == FF_EFFECTS_MAX) {
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spin_unlock_irqrestore(&pid_private->lock, flags);
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// TEMP - We need to get ff_effects_max correctly first: || id >= dev->ff_effects_max) {
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dev_dbg(&pid_private->hid->dev->dev, "Not enough device memory\n");
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return -ENOMEM;
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}
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effect->id = id;
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dev_dbg(&pid_private->hid->dev->dev, "effect ID is %d\n.", id);
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pid_private->effects[id].owner = current->pid;
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pid_private->effects[id].flags = (1 << FF_PID_FLAGS_USED);
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spin_unlock_irqrestore(&pid_private->lock, flags);
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is_update = FF_PID_FALSE;
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} else {
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/* We want to update an effect */
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if (!CHECK_OWNERSHIP(effect->id, pid_private))
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return -EACCES;
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/* Parameter type cannot be updated */
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if (effect->type != pid_private->effects[effect->id].effect.type)
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return -EINVAL;
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/* Check the effect is not already being updated */
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if (test_bit(FF_PID_FLAGS_UPDATING, &pid_private->effects[effect->id].flags))
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return -EAGAIN;
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is_update = FF_PID_TRUE;
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}
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/*
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* Upload the effect
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*/
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switch (effect->type) {
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case FF_PERIODIC:
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ret = pid_upload_periodic(pid_private, effect, is_update);
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break;
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case FF_CONSTANT:
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ret = pid_upload_constant(pid_private, effect, is_update);
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break;
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case FF_SPRING:
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case FF_FRICTION:
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case FF_DAMPER:
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case FF_INERTIA:
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ret = pid_upload_condition(pid_private, effect, is_update);
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break;
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case FF_RAMP:
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ret = pid_upload_ramp(pid_private, effect, is_update);
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break;
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default:
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dev_dbg(&pid_private->hid->dev->dev,
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"invalid type of effect requested - %x.\n",
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effect->type);
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return -EINVAL;
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}
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/* If a packet was sent, forbid new updates until we are notified
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* that the packet was updated
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*/
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if (ret == 0)
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set_bit(FF_PID_FLAGS_UPDATING, &pid_private->effects[effect->id].flags);
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pid_private->effects[effect->id].effect = *effect;
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return ret;
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}
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int hid_pid_init(struct hid_device *hid)
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{
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struct hid_ff_pid *private;
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struct hid_input *hidinput = list_entry(&hid->inputs, struct hid_input, list);
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struct input_dev *input_dev = hidinput->input;
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private = hid->ff_private = kzalloc(sizeof(struct hid_ff_pid), GFP_KERNEL);
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if (!private)
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return -ENOMEM;
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private->hid = hid;
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hid->ff_exit = hid_pid_exit;
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hid->ff_event = hid_pid_event;
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/* Open output URB */
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if (!(private->urbffout = usb_alloc_urb(0, GFP_KERNEL))) {
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kfree(private);
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return -1;
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}
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usb_fill_control_urb(private->urbffout, hid->dev, 0,
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(void *)&private->ffcr, private->ctrl_buffer, 8,
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hid_pid_ctrl_out, hid);
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input_dev->upload_effect = hid_pid_upload_effect;
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input_dev->flush = hid_pid_flush;
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input_dev->ff_effects_max = 8; // A random default
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set_bit(EV_FF, input_dev->evbit);
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set_bit(EV_FF_STATUS, input_dev->evbit);
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spin_lock_init(&private->lock);
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printk(KERN_INFO "Force feedback driver for PID devices by Rodrigo Damazio <rdamazio@lsi.usp.br>.\n");
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return 0;
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}
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