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Diffstat (limited to 'drivers/usb/input/pid.c')
-rw-r--r--drivers/usb/input/pid.c295
1 files changed, 0 insertions, 295 deletions
diff --git a/drivers/usb/input/pid.c b/drivers/usb/input/pid.c
deleted file mode 100644
index d9d9f656b8c9..000000000000
--- a/drivers/usb/input/pid.c
+++ /dev/null
@@ -1,295 +0,0 @@
1/*
2 * PID Force feedback support for hid devices.
3 *
4 * Copyright (c) 2002 Rodrigo Damazio.
5 * Portions by Johann Deneux and Bjorn Augustson
6 */
7
8/*
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 *
23 * Should you need to contact me, the author, you can do so by
24 * e-mail - mail your message to <rdamazio@lsi.usp.br>
25 */
26
27#include <linux/config.h>
28#include <linux/module.h>
29#include <linux/slab.h>
30#include <linux/kernel.h>
31#include <linux/init.h>
32#include <linux/mm.h>
33#include <linux/smp_lock.h>
34#include <linux/spinlock.h>
35#include <linux/input.h>
36#include <linux/usb.h>
37#include "hid.h"
38#include "pid.h"
39
40#define CHECK_OWNERSHIP(i, hid_pid) \
41 ((i) < FF_EFFECTS_MAX && i >= 0 && \
42 test_bit(FF_PID_FLAGS_USED, &hid_pid->effects[(i)].flags) && \
43 (current->pid == 0 || \
44 (hid_pid)->effects[(i)].owner == current->pid))
45
46/* Called when a transfer is completed */
47static void hid_pid_ctrl_out(struct urb *u, struct pt_regs *regs)
48{
49 dev_dbg(&u->dev->dev, "hid_pid_ctrl_out - Transfer Completed\n");
50}
51
52static void hid_pid_exit(struct hid_device *hid)
53{
54 struct hid_ff_pid *private = hid->ff_private;
55
56 if (private->urbffout) {
57 usb_kill_urb(private->urbffout);
58 usb_free_urb(private->urbffout);
59 }
60}
61
62static int pid_upload_periodic(struct hid_ff_pid *pid, struct ff_effect *effect, int is_update)
63{
64 dev_info(&pid->hid->dev->dev, "requested periodic force upload\n");
65 return 0;
66}
67
68static int pid_upload_constant(struct hid_ff_pid *pid, struct ff_effect *effect, int is_update)
69{
70 dev_info(&pid->hid->dev->dev, "requested constant force upload\n");
71 return 0;
72}
73
74static int pid_upload_condition(struct hid_ff_pid *pid, struct ff_effect *effect, int is_update)
75{
76 dev_info(&pid->hid->dev->dev, "requested Condition force upload\n");
77 return 0;
78}
79
80static int pid_upload_ramp(struct hid_ff_pid *pid, struct ff_effect *effect, int is_update)
81{
82 dev_info(&pid->hid->dev->dev, "request ramp force upload\n");
83 return 0;
84}
85
86static int hid_pid_event(struct hid_device *hid, struct input_dev *input,
87 unsigned int type, unsigned int code, int value)
88{
89 dev_dbg(&hid->dev->dev, "PID event received: type=%d,code=%d,value=%d.\n", type, code, value);
90
91 if (type != EV_FF)
92 return -1;
93
94 return 0;
95}
96
97/* Lock must be held by caller */
98static void hid_pid_ctrl_playback(struct hid_device *hid, struct hid_pid_effect *effect, int play)
99{
100 if (play)
101 set_bit(FF_PID_FLAGS_PLAYING, &effect->flags);
102 else
103 clear_bit(FF_PID_FLAGS_PLAYING, &effect->flags);
104}
105
106static int hid_pid_erase(struct input_dev *dev, int id)
107{
108 struct hid_device *hid = dev->private;
109 struct hid_ff_pid *pid = hid->ff_private;
110 struct hid_field *field;
111 unsigned long flags;
112 int ret;
113
114 if (!CHECK_OWNERSHIP(id, pid))
115 return -EACCES;
116
117 /* Find report */
118 field = hid_find_field_by_usage(hid, HID_UP_PID | FF_PID_USAGE_BLOCK_FREE,
119 HID_OUTPUT_REPORT);
120 if (!field) {
121 dev_err(&hid->dev->dev, "couldn't find report\n");
122 return -EIO;
123 }
124
125 ret = hid_set_field(field, 0, pid->effects[id].device_id);
126 if (ret) {
127 dev_err(&hid->dev->dev, "couldn't set field\n");
128 return ret;
129 }
130
131 hid_submit_report(hid, field->report, USB_DIR_OUT);
132
133 spin_lock_irqsave(&pid->lock, flags);
134 hid_pid_ctrl_playback(hid, pid->effects + id, 0);
135 pid->effects[id].flags = 0;
136 spin_unlock_irqrestore(&pid->lock, flags);
137
138 return 0;
139}
140
141/* Erase all effects this process owns */
142static int hid_pid_flush(struct input_dev *dev, struct file *file)
143{
144 struct hid_device *hid = dev->private;
145 struct hid_ff_pid *pid = hid->ff_private;
146 int i;
147
148 /*NOTE: no need to lock here. The only times EFFECT_USED is
149 modified is when effects are uploaded or when an effect is
150 erased. But a process cannot close its dev/input/eventX fd
151 and perform ioctls on the same fd all at the same time */
152 /*FIXME: multiple threads, anyone? */
153 for (i = 0; i < dev->ff_effects_max; ++i)
154 if (current->pid == pid->effects[i].owner
155 && test_bit(FF_PID_FLAGS_USED, &pid->effects[i].flags))
156 if (hid_pid_erase(dev, i))
157 dev_warn(&hid->dev->dev, "erase effect %d failed", i);
158
159 return 0;
160}
161
162static int hid_pid_upload_effect(struct input_dev *dev,
163 struct ff_effect *effect)
164{
165 struct hid_ff_pid *pid_private = (struct hid_ff_pid *)(dev->private);
166 int ret;
167 int is_update;
168 unsigned long flags;
169
170 dev_dbg(&pid_private->hid->dev->dev, "upload effect called: effect_type=%x\n", effect->type);
171 /* Check this effect type is supported by this device */
172 if (!test_bit(effect->type, dev->ffbit)) {
173 dev_dbg(&pid_private->hid->dev->dev,
174 "invalid kind of effect requested.\n");
175 return -EINVAL;
176 }
177
178 /*
179 * If we want to create a new effect, get a free id
180 */
181 if (effect->id == -1) {
182 int id = 0;
183
184 // Spinlock so we don`t get a race condition when choosing IDs
185 spin_lock_irqsave(&pid_private->lock, flags);
186
187 while (id < FF_EFFECTS_MAX)
188 if (!test_and_set_bit(FF_PID_FLAGS_USED, &pid_private->effects[id++].flags))
189 break;
190
191 if (id == FF_EFFECTS_MAX) {
192 spin_unlock_irqrestore(&pid_private->lock, flags);
193// TEMP - We need to get ff_effects_max correctly first: || id >= dev->ff_effects_max) {
194 dev_dbg(&pid_private->hid->dev->dev, "Not enough device memory\n");
195 return -ENOMEM;
196 }
197
198 effect->id = id;
199 dev_dbg(&pid_private->hid->dev->dev, "effect ID is %d.\n", id);
200 pid_private->effects[id].owner = current->pid;
201 pid_private->effects[id].flags = (1 << FF_PID_FLAGS_USED);
202 spin_unlock_irqrestore(&pid_private->lock, flags);
203
204 is_update = FF_PID_FALSE;
205 } else {
206 /* We want to update an effect */
207 if (!CHECK_OWNERSHIP(effect->id, pid_private))
208 return -EACCES;
209
210 /* Parameter type cannot be updated */
211 if (effect->type != pid_private->effects[effect->id].effect.type)
212 return -EINVAL;
213
214 /* Check the effect is not already being updated */
215 if (test_bit(FF_PID_FLAGS_UPDATING, &pid_private->effects[effect->id].flags))
216 return -EAGAIN;
217
218 is_update = FF_PID_TRUE;
219 }
220
221 /*
222 * Upload the effect
223 */
224 switch (effect->type) {
225 case FF_PERIODIC:
226 ret = pid_upload_periodic(pid_private, effect, is_update);
227 break;
228
229 case FF_CONSTANT:
230 ret = pid_upload_constant(pid_private, effect, is_update);
231 break;
232
233 case FF_SPRING:
234 case FF_FRICTION:
235 case FF_DAMPER:
236 case FF_INERTIA:
237 ret = pid_upload_condition(pid_private, effect, is_update);
238 break;
239
240 case FF_RAMP:
241 ret = pid_upload_ramp(pid_private, effect, is_update);
242 break;
243
244 default:
245 dev_dbg(&pid_private->hid->dev->dev,
246 "invalid type of effect requested - %x.\n",
247 effect->type);
248 return -EINVAL;
249 }
250 /* If a packet was sent, forbid new updates until we are notified
251 * that the packet was updated
252 */
253 if (ret == 0)
254 set_bit(FF_PID_FLAGS_UPDATING, &pid_private->effects[effect->id].flags);
255 pid_private->effects[effect->id].effect = *effect;
256 return ret;
257}
258
259int hid_pid_init(struct hid_device *hid)
260{
261 struct hid_ff_pid *private;
262 struct hid_input *hidinput = list_entry(hid->inputs.next, struct hid_input, list);
263 struct input_dev *input_dev = hidinput->input;
264
265 private = hid->ff_private = kzalloc(sizeof(struct hid_ff_pid), GFP_KERNEL);
266 if (!private)
267 return -ENOMEM;
268
269 private->hid = hid;
270
271 hid->ff_exit = hid_pid_exit;
272 hid->ff_event = hid_pid_event;
273
274 /* Open output URB */
275 if (!(private->urbffout = usb_alloc_urb(0, GFP_KERNEL))) {
276 kfree(private);
277 return -1;
278 }
279
280 usb_fill_control_urb(private->urbffout, hid->dev, 0,
281 (void *)&private->ffcr, private->ctrl_buffer, 8,
282 hid_pid_ctrl_out, hid);
283
284 input_dev->upload_effect = hid_pid_upload_effect;
285 input_dev->flush = hid_pid_flush;
286 input_dev->ff_effects_max = 8; // A random default
287 set_bit(EV_FF, input_dev->evbit);
288 set_bit(EV_FF_STATUS, input_dev->evbit);
289
290 spin_lock_init(&private->lock);
291
292 printk(KERN_INFO "Force feedback driver for PID devices by Rodrigo Damazio <rdamazio@lsi.usp.br>.\n");
293
294 return 0;
295}
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