/*
* Force feedback driver for USB HID PID compliant devices
*
* Copyright (c) 2005, 2006 Anssi Hannula <anssi.hannula@gmail.com>
*/
/*
* 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
*/
/* #define DEBUG */
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/input.h>
#include <linux/slab.h>
#include <linux/usb.h>
#include <linux/hid.h>
#include "usbhid.h"
#define PID_EFFECTS_MAX 64
/* Report usage table used to put reports into an array */
#define PID_SET_EFFECT 0
#define PID_EFFECT_OPERATION 1
#define PID_DEVICE_GAIN 2
#define PID_POOL 3
#define PID_BLOCK_LOAD 4
#define PID_BLOCK_FREE 5
#define PID_DEVICE_CONTROL 6
#define PID_CREATE_NEW_EFFECT 7
#define PID_REQUIRED_REPORTS 7
#define PID_SET_ENVELOPE 8
#define PID_SET_CONDITION 9
#define PID_SET_PERIODIC 10
#define PID_SET_CONSTANT 11
#define PID_SET_RAMP 12
static const u8 pidff_reports[] = {
0x21, 0x77, 0x7d, 0x7f, 0x89, 0x90, 0x96, 0xab,
0x5a, 0x5f, 0x6e, 0x73, 0x74
};
/* device_control is really 0x95, but 0x96 specified as it is the usage of
the only field in that report */
/* Value usage tables used to put fields and values into arrays */
#define PID_EFFECT_BLOCK_INDEX 0
#define PID_DURATION 1
#define PID_GAIN 2
#define PID_TRIGGER_BUTTON 3
#define PID_TRIGGER_REPEAT_INT 4
#define PID_DIRECTION_ENABLE 5
#define PID_START_DELAY 6
static const u8 pidff_set_effect[] = {
0x22, 0x50, 0x52, 0x53, 0x54, 0x56, 0xa7
};
#define PID_ATTACK_LEVEL 1
#define PID_ATTACK_TIME 2
#define PID_FADE_LEVEL 3
#define PID_FADE_TIME 4
static const u8 pidff_set_envelope[] = { 0x22, 0x5b, 0x5c, 0x5d, 0x5e };
#define PID_PARAM_BLOCK_OFFSET 1
#define PID_CP_OFFSET 2
#define PID_POS_COEFFICIENT 3
#define PID_NEG_COEFFICIENT 4
#define PID_POS_SATURATION 5
#define PID_NEG_SATURATION 6
#define PID_DEAD_BAND 7
static const u8 pidff_set_condition[] = {
0x22, 0x23, 0x60, 0x61, 0x62, 0x63, 0x64, 0x65
};
#define PID_MAGNITUDE 1
#define PID_OFFSET 2
#define PID_PHASE 3
#define PID_PERIOD 4
static const u8 pidff_set_periodic[] = { 0x22, 0x70, 0x6f, 0x71, 0x72 };
static const u8 pidff_set_constant[] = { 0x22, 0x70 };
#define PID_RAMP_START 1
#define PID_RAMP_END 2
static const u8 pidff_set_ramp[] = { 0x22, 0x75, 0x76 };
#define PID_RAM_POOL_AVAILABLE 1
static const u8 pidff_block_load[] = { 0x22, 0xac };
#define PID_LOOP_COUNT 1
static const u8 pidff_effect_operation[] = { 0x22, 0x7c };
static const u8 pidff_block_free[] = { 0x22 };
#define PID_DEVICE_GAIN_FIELD 0
static const u8 pidff_device_gain[] = { 0x7e };
#define PID_RAM_POOL_SIZE 0
#define PID_SIMULTANEOUS_MAX 1
#define PID_DEVICE_MANAGED_POOL 2
static const u8 pidff_pool[] = { 0x80, 0x83, 0xa9 };
/* Special field key tables used to put special field keys into arrays */
#define PID_ENABLE_ACTUATORS 0
#define PID_RESET 1
static const u8 pidff_device_control[] = { 0x97, 0x9a };
#define PID_CONSTANT 0
#define PID_RAMP 1
#define PID_SQUARE 2
#define PID_SINE 3
#define PID_TRIANGLE 4
#define PID_SAW_UP 5
#define PID_SAW_DOWN 6
#define PID_SPRING 7
#define PID_DAMPER 8
#define PID_INERTIA 9
#define PID_FRICTION 10
static const u8 pidff_effect_types[] = {
0x26, 0x27, 0x30, 0x31, 0x32, 0x33, 0x34,
0x40, 0x41, 0x42, 0x43
};
#define PID_BLOCK_LOAD_SUCCESS 0
#define PID_BLOCK_LOAD_FULL 1
static const u8 pidff_block_load_status[] = { 0x8c, 0x8d };
#define PID_EFFECT_START 0
#define PID_EFFECT_STOP 1
static const u8 pidff_effect_operation_status[] = { 0x79, 0x7b };
struct pidff_usage {
struct hid_field *field;
s32 *value;
};
struct pidff_device {
struct hid_device *hid;
struct hid_report *reports[sizeof(pidff_reports)];
struct pidff_usage set_effect[sizeof(pidff_set_effect)];
struct pidff_usage set_envelope[sizeof(pidff_set_envelope)];
struct pidff_usage set_condition[sizeof(pidff_set_condition)];
struct pidff_usage set_periodic[sizeof(pidff_set_periodic)];
struct pidff_usage set_constant[sizeof(pidff_set_constant)];
struct pidff_usage set_ramp[sizeof(pidff_set_ramp)];
struct pidff_usage device_gain[sizeof(pidff_device_gain)];
struct pidff_usage block_load[sizeof(pidff_block_load)];
struct pidff_usage pool[sizeof(pidff_pool)];
struct pidff_usage effect_operation[sizeof(pidff_effect_operation)];
struct pidff_usage block_free[sizeof(pidff_block_free)];
/* Special field is a field that is not composed of
usage<->value pairs that pidff_usage values are */
/* Special field in create_new_effect */
struct hid_field *create_new_effect_type;
/* Special fields in set_effect */
struct hid_field *set_effect_type;
struct hid_field *effect_direction;
/* Special field in device_control */
struct hid_field *device_control;
/* Special field in block_load */
struct hid_field *block_load_status;
/* Special field in effect_operation */
struct hid_field *effect_operation_status;
int control_id[sizeof(pidff_device_control)];
int type_id[sizeof(pidff_effect_types)];
int status_id[sizeof(pidff_block_load_status)];
int operation_id[sizeof(pidff_effect_operation_status)];
int pid_id[PID_EFFECTS_MAX];
};
/*
* Scale an unsigned value with range 0..max for the given field
*/
static int pidff_rescale(int i, int max, struct hid_field *field)
{
return i * (field->logical_maximum - field->logical_minimum) / max +
field->logical_minimum;
}
/*
* Scale a signed value in range -0x8000..0x7fff for the given field
*/
static int pidff_rescale_signed(int i, struct hid_field *field)
{
return i == 0 ? 0 : i >
0 ? i * field->logical_maximum / 0x7fff : i *
field->logical_minimum / -0x8000;
}
static void pidff_set(struct pidff_usage *usage, u16 value)
{
usage->value[0] = pidff_rescale(value, 0xffff, usage->field);
pr_debug("calculated from %d to %d\n", value, usage->value[0]);
}
static void pidff_set_signed(struct pidff_usage *usage, s16 value)
{
if (usage->field->logical_minimum < 0)
usage->value[0] = pidff_rescale_signed(value, usage->field);
else {
if (value < 0)
usage->value[0] =
pidff_rescale(-value, 0x8000, usage->field);
else
usage->value[0] =
pidff_rescale(value, 0x7fff, usage->field);
}
pr_debug("calculated from %d to %d\n", value, usage->value[0]);
}
/*
* Send envelope report to the device
*/
static void pidff_set_envelope_report(struct pidff_device *pidff,
struct ff_envelope *envelope)
{
pidff->set_envelope[PID_EFFECT_BLOCK_INDEX].value[0] =
pidff->block_load[PID_EFFECT_BLOCK_INDEX].value[0];
pidff->set_envelope[PID_ATTACK_LEVEL].value[0] =
pidff_rescale(envelope->attack_level >
0x7fff ? 0x7fff : envelope->attack_level, 0x7fff,
pidff->set_envelope[PID_ATTACK_LEVEL].field);
pidff->set_envelope[PID_FADE_LEVEL].value[0] =
pidff_rescale(envelope->fade_level >
0x7fff ? 0x7fff : envelope->fade_level, 0x7fff,
pidff->set_envelope[PID_FADE_LEVEL].field);
pidff->set_envelope[PID_ATTACK_TIME].value[0] = envelope->attack_length;
pidff->set_envelope[PID_FADE_TIME].value[0] = envelope->fade_length;
hid_dbg(pidff->hid, "attack %u => %d\n",
envelope->attack_level,
pidff->set_envelope[PID_ATTACK_LEVEL].value[0]);
hid_hw_request(pidff->hid, pidff->reports[PID_SET_ENVELOPE],
HID_REQ_SET_REPORT);
}
/*
* Test if the new envelope differs from old one
*/
static int pidff_needs_set_envelope(struct ff_envelope *envelope,
struct ff_envelope *old)
{
return envelope->attack_level != old->attack_level ||
envelope->fade_level != old->fade_level ||
envelope->attack_length != old->attack_length ||
envelope->fade_length != old->fade_length;
}
/*
* Send constant force report to the device
*/
static void pidff_set_constant_force_report(struct pidff_device *pidff,
struct ff_effect *effect)
{
pidff->set_constant[PID_EFFECT_BLOCK_INDEX].value[0] =
pidff->block_load[PID_EFFECT_BLOCK_INDEX].value[0];
pidff_set_signed(&pidff->set_constant[PID_MAGNITUDE],
effect->u.constant.level);
hid_hw_request(pidff->hid, pidff->reports[PID_SET_CONSTANT],
HID_REQ_SET_REPORT);
}
/*
* Test if the constant parameters have changed between effects
*/
static int pidff_needs_set_constant(struct ff_effect *effect,
struct ff_effect *old)
{
return effect->u.constant.level != old->u.constant.level;
}
/*
* Send set effect report to the device
*/
static void pidff_set_effect_report(struct pidff_device *pidff,
struct ff_effect *effect)
{
pidff->set_effect[PID_EFFECT_BLOCK_INDEX].value[0] =
pidff->block_load[PID_EFFECT_BLOCK_INDEX].value[0];
pidff->set_effect_type->value[0] =
pidff->create_new_effect_type->value[0];
pidff->set_effect[PID_DURATION].value[0] = effect->replay.length;
pidff->set_effect[PID_TRIGGER_BUTTON].value[0] = effect->trigger.button;
pidff->set_effect[PID_TRIGGER_REPEAT_INT].value[0] =
effect->trigger.interval;
pidff->set_effect[PID_GAIN].value[0] =
pidff->set_effect[PID_GAIN].field->logical_maximum;
pidff->set_effect[PID_DIRECTION_ENABLE].value[0] = 1;
pidff->effect_direction->value[0] =
pidff_rescale(effect->direction, 0xffff,
pidff->effect_direction);
pidff->set_effect[PID_START_DELAY].value[0] = effect->replay.delay;
hid_hw_request(pidff->hid, pidff->reports[PID_SET_EFFECT],
HID_REQ_SET_REPORT);
}
/*
* Test if the values used in set_effect have changed
*/
static int pidff_needs_set_effect(struct ff_effect *effect,
struct ff_effect *old)
{
return effect->replay.length != old->replay.length ||
effect->trigger.interval != old->trigger.interval ||
effect->trigger.button != old->trigger.button ||
effect->direction != old->direction ||
effect->replay.delay != old->replay.delay;
}
/*
* Send periodic effect report to the device
*/
static void pidff_set_periodic_report(struct pidff_device *pidff,
struct ff_effect *effect)
{
pidff->set_periodic[PID_EFFECT_BLOCK_INDEX].value[0] =
pidff->block_load[PID_EFFECT_BLOCK_INDEX].value[0];
pidff_set_signed(&pidff->set_periodic[PID_MAGNITUDE],
effect->u.periodic.magnitude);
pidff_set_signed(&pidff->set_periodic[PID_OFFSET],
effect->u.periodic.offset);
pidff_set(&pidff->set_periodic[PID_PHASE], effect->u.periodic.phase);
pidff->set_periodic[PID_PERIOD].value[0] = effect->u.periodic.period;
hid_hw_request(pidff->hid, pidff->reports[PID_SET_PERIODIC],
HID_REQ_SET_REPORT);
}
/*
* Test if periodic effect parameters have changed
*/
static int pidff_needs_set_periodic(struct ff_effect *effect,
struct ff_effect *old)
{
return effect->u.periodic.magnitude != old->u.periodic.magnitude ||
effect->u.periodic.offset != old->u.periodic.offset ||
effect->u.periodic.phase != old->u.periodic.phase ||
effect->u.periodic.period != old->u.periodic.period;
}
/*
* Send condition effect reports to the device
*/
static void pidff_set_condition_report(struct pidff_device *pidff,
struct ff_effect *effect)
{
int i;
pidff->set_condition[PID_EFFECT_BLOCK_INDEX].value[0] =
pidff->block_load[PID_EFFECT_BLOCK_INDEX].value[0];
for (i = 0; i < 2; i++) {
pidff->set_condition[PID_PARAM_BLOCK_OFFSET].value[0] = i;
pidff_set_signed(&pidff->set_condition[PID_CP_OFFSET],
effect->u.condition[i].center);
pidff_set_signed(&pidff->set_condition[PID_POS_COEFFICIENT],
effect->u.condition[i].right_coeff);
pidff_set_signed(&pidff->set_condition[PID_NEG_COEFFICIENT],
effect->u.condition[i].left_coeff);
pidff_set(&pidff->set_condition[PID_POS_SATURATION],
effect->u.condition[i].right_saturation);
pidff_set(&pidff->set_condition[PID_NEG_SATURATION],
effect->u.condition[i].left_saturation);
pidff_set(&pidff->set_condition[PID_DEAD_BAND],
effect->u.condition[i].deadband);
hid_hw_request(pidff->hid, pidff->reports[PID_SET_CONDITION],
HID_REQ_SET_REPORT);
}
}
/*
* Test if condition effect parameters have changed
*/
static int pidff_needs_set_condition(struct ff_effect *effect,
struct ff_effect *old)
{
int i;
int ret = 0;
for (i = 0; i < 2; i++) {
struct ff_condition_effect *cond = &effect->u.condition[i];
struct ff_condition_effect *old_cond = &old->u.condition[i];
ret |= cond->center != old_cond->center ||
cond->right_coeff != old_cond->right_coeff ||
cond->left_coeff != old_cond->left_coeff ||
cond->right_saturation != old_cond->right_saturation ||
cond->left_saturation != old_cond->left_saturation ||
cond->deadband != old_cond->deadband;
}
return ret;
}
/*
* Send ramp force report to the device
*/
static void pidff_set_ramp_force_report(struct pidff_device *pidff,
struct ff_effect *effect)
{
pidff->set_ramp[PID_EFFECT_BLOCK_INDEX].value[0] =
pidff->block_load[PID_EFFECT_BLOCK_INDEX].value[0];
pidff_set_signed(&pidff->set_ramp[PID_RAMP_START],
effect->u.ramp.start_level);
pidff_set_signed(&pidff->set_ramp[PID_RAMP_END],
effect->u.ramp.end_level);
hid_hw_request(pidff->hid, pidff->reports[PID_SET_RAMP],
HID_REQ_SET_REPORT);
}
/*
* Test if ramp force parameters have changed
*/
static int pidff_needs_set_ramp(struct ff_effect *effect, struct ff_effect *old)
{
return effect->u.ramp.start_level != old->u.ramp.start_level ||
effect->u.ramp.end_level != old->u.ramp.end_level;
}
/*
* Send a request for effect upload to the device
*
* Returns 0 if device reported success, -ENOSPC if the device reported memory
* is full. Upon unknown response the function will retry for 60 times, if
* still unsuccessful -EIO is returned.
*/
static int pidff_request_effect_upload(struct pidff_device *pidff, int efnum)
{
int j;
pidff->create_new_effect_type->value[0] = efnum;
hid_hw_request(pidff->hid, pidff->reports[PID_CREATE_NEW_EFFECT],
HID_REQ_SET_REPORT);
hid_dbg(pidff->hid, "create_new_effect sent, type: %d\n", efnum);
pidff->block_load[PID_EFFECT_BLOCK_INDEX].value[0] = 0;
pidff->block_load_status->value[0] = 0;
hid_hw_wait(pidff->hid);
for (j = 0; j < 60; j++) {
hid_dbg(pidff->hid, "pid_block_load requested\n");
hid_hw_request(pidff->hid, pidff->reports[PID_BLOCK_LOAD],
HID_REQ_GET_REPORT);
hid_hw_wait(pidff->hid);
if (pidff->block_load_status->value[0] ==
pidff->status_id[PID_BLOCK_LOAD_SUCCESS]) {
hid_dbg(pidff->hid, "device reported free memory: %d bytes\n",
pidff->block_load[PID_RAM_POOL_AVAILABLE].value ?
pidff->block_load[PID_RAM_POOL_AVAILABLE].value[0] : -1);
return 0;
}
if (pidff->block_load_status->value[0] ==
pidff->status_id[PID_BLOCK_LOAD_FULL]) {
hid_dbg(pidff->hid, "not enough memory free: %d bytes\n",
pidff->block_load[PID_RAM_POOL_AVAILABLE].value ?
pidff->block_load[PID_RAM_POOL_AVAILABLE].value[0] : -1);
return -ENOSPC;
}
}
hid_err(pidff->hid, "pid_block_load failed 60 times\n");
return -EIO;
}
/*
* Play the effect with PID id n times
*/
static void pidff_playback_pid(struct pidff_device *pidff, int pid_id, int n)
{
pidff->effect_operation[PID_EFFECT_BLOCK_INDEX].value[0] = pid_id;
if (n == 0) {
pidff->effect_operation_status->value[0] =
pidff->operation_id[PID_EFFECT_STOP];
} else {
pidff->effect_operation_status->value[0] =
pidff->operation_id[PID_EFFECT_START];
pidff->effect_operation[PID_LOOP_COUNT].value[0] = n;
}
hid_hw_request(pidff->hid, pidff->reports[PID_EFFECT_OPERATION],
HID_REQ_SET_REPORT);
}
/**
* Play the effect with effect id @effect_id for @value times
*/
static int pidff_playback(struct input_dev *dev, int effect_id, int value)
{
struct pidff_device *pidff = dev->ff->private;
pidff_playback_pid(pidff, pidff->pid_id[effect_id], value);
return 0;
}
/*
* Erase effect with PID id
*/
static void pidff_erase_pid(struct pidff_device *pidff, int pid_id)
{
pidff->block_free[PID_EFFECT_BLOCK_INDEX].value[0] = pid_id;
hid_hw_request(pidff->hid, pidff->reports[PID_BLOCK_FREE],
HID_REQ_SET_REPORT);
}
/*
* Stop and erase effect with effect_id
*/
static int pidff_erase_effect(struct input_dev *dev, int effect_id)
{
struct pidff_device *pidff = dev->ff->private;
int pid_id = pidff->pid_id[effect_id];
hid_dbg(pidff->hid, "starting to erase %d/%d\n",
effect_id, pidff->pid_id[effect_id]);
/* Wait for the queue to clear. We do not want a full fifo to
prevent the effect removal. */
hid_hw_wait(pidff->hid);
pidff_playback_pid(pidff, pid_id, 0);
pidff_erase_pid(pidff, pid_id);
return 0;
}
/*
* Effect upload handler
*/
static int pidff_upload_effect(struct input_dev *dev, struct ff_effect *effect,
struct ff_effect *old)
{
struct pidff_device *pidff = dev->ff->private;
int type_id;
int error;
switch (effect->type) {
case FF_CONSTANT:
if (!old) {
error = pidff_request_effect_upload(pidff,
pidff->type_id[PID_CONSTANT]);
if (error)
return error;
}
if (!old || pidff_needs_set_effect(effect, old))
pidff_set_effect_report(pidff, effect);
if (!old || pidff_needs_set_constant(effect, old))
pidff_set_constant_force_report(pidff, effect);
if (!old ||
pidff_needs_set_envelope(&effect->u.constant.envelope,
&old->u.constant.envelope))
pidff_set_envelope_report(pidff,
&effect->u.constant.envelope);
break;
case FF_PERIODIC:
if (!old) {
switch (effect->u.periodic.waveform) {
case FF_SQUARE:
type_id = PID_SQUARE;
break;
case FF_TRIANGLE:
type_id = PID_TRIANGLE;
break;
case FF_SINE:
type_id = PID_SINE;
break;
case FF_SAW_UP:
type_id = PID_SAW_UP;
break;
case FF_SAW_DOWN:
type_id = PID_SAW_DOWN;
break;
default:
hid_err(pidff->hid, "invalid waveform\n");
return -EINVAL;
}
error = pidff_request_effect_upload(pidff,
pidff->type_id[type_id]);
if (error)
return error;
}
if (!old || pidff_needs_set_effect(effect, old))
pidff_set_effect_report(pidff, effect);
if (!old || pidff_needs_set_periodic(effect, old))
pidff_set_periodic_report(pidff, effect);
if (!old ||
pidff_needs_set_envelope(&effect->u.periodic.envelope,
&old->u.periodic.envelope))
pidff_set_envelope_report(pidff,
&effect->u.periodic.envelope);
break;
case FF_RAMP:
if (!old) {
error = pidff_request_effect_upload(pidff,
pidff->type_id[PID_RAMP]);
if (error)
return error;
}
if (!old || pidff_needs_set_effect(effect, old))
pidff_set_effect_report(pidff, effect);
if (!old || pidff_needs_set_ramp(effect, old))
pidff_set_ramp_force_report(pidff, effect);
if (!old ||
pidff_needs_set_envelope(&effect->u.ramp.envelope,
&old->u.ramp.envelope))
pidff_set_envelope_report(pidff,
&effect->u.ramp.envelope);
break;
case FF_SPRING:
if (!old) {
error = pidff_request_effect_upload(pidff,
pidff->type_id[PID_SPRING]);
if (error)
return error;
}
if (!old || pidff_needs_set_effect(effect, old))
pidff_set_effect_report(pidff, effect);
if (!old || pidff_needs_set_condition(effect, old))
pidff_set_condition_report(pidff, effect);
break;
case FF_FRICTION:
if (!old) {
error = pidff_request_effect_upload(pidff,
pidff->type_id[PID_FRICTION]);
if (error)
return error;
}
if (!old || pidff_needs_set_effect(effect, old))
pidff_set_effect_report(pidff, effect);
if (!old || pidff_needs_set_condition(effect, old))
pidff_set_condition_report(pidff, effect);
break;
case FF_DAMPER:
if (!old) {
error = pidff_request_effect_upload(pidff,
pidff->type_id[PID_DAMPER]);
if (error)
return error;
}
if (!old || pidff_needs_set_effect(effect, old))
pidff_set_effect_report(pidff, effect);
if (!old || pidff_needs_set_condition(effect, old))
pidff_set_condition_report(pidff, effect);
break;
case FF_INERTIA:
if (!old) {
error = pidff_request_effect_upload(pidff,
pidff->type_id[PID_INERTIA]);
if (error)
return error;
}
if (!old || pidff_needs_set_effect(effect, old))
pidff_set_effect_report(pidff, effect);
if (!old || pidff_needs_set_condition(effect, old))
pidff_set_condition_report(pidff, effect);
break;
default:
hid_err(pidff->hid, "invalid type\n");
return -EINVAL;
}
if (!old)
pidff->pid_id[effect->id] =
pidff->block_load[PID_EFFECT_BLOCK_INDEX].value[0];
hid_dbg(pidff->hid, "uploaded\n");
return 0;
}
/*
* set_gain() handler
*/
static void pidff_set_gain(struct input_dev *dev, u16 gain)
{
struct pidff_device *pidff = dev->ff->private;
pidff_set(&pidff->device_gain[PID_DEVICE_GAIN_FIELD], gain);
hid_hw_request(pidff->hid, pidff->reports[PID_DEVICE_GAIN],
HID_REQ_SET_REPORT);
}
static void pidff_autocenter(struct pidff_device *pidff, u16 magnitude)
{
struct hid_field *field =
pidff->block_load[PID_EFFECT_BLOCK_INDEX].field;
if (!magnitude) {
pidff_playback_pid(pidff, field->logical_minimum, 0);
return;
}
pidff_playback_pid(pidff, field->logical_minimum, 1);
pidff->set_effect[PID_EFFECT_BLOCK_INDEX].value[0] =
pidff->block_load[PID_EFFECT_BLOCK_INDEX].field->logical_minimum;
pidff->set_effect_type->value[0] = pidff->type_id[PID_SPRING];
pidff->set_effect[PID_DURATION].value[0] = 0;
pidff->set_effect[PID_TRIGGER_BUTTON].value[0] = 0;
pidff->set_effect[PID_TRIGGER_REPEAT_INT].value[0] = 0;
pidff_set(&pidff->set_effect[PID_GAIN], magnitude);
pidff->set_effect[PID_DIRECTION_ENABLE].value[0] = 1;
pidff->set_effect[PID_START_DELAY].value[0] = 0;
hid_hw_request(pidff->hid, pidff->reports[PID_SET_EFFECT],
HID_REQ_SET_REPORT);
}
/*
* pidff_set_autocenter() handler
*/
static void pidff_set_autocenter(struct input_dev *dev, u16 magnitude)
{
struct pidff_device *pidff = dev->ff->private;
pidff_autocenter(pidff, magnitude);
}
/*
* Find fields from a report and fill a pidff_usage
*/
static int pidff_find_fields(struct pidff_usage *usage, const u8 *table,
struct hid_report *report, int count, int strict)
{
int i, j, k, found;
for (k = 0; k < count; k++) {
found = 0;
for (i = 0; i < report->maxfield; i++) {
if (report->field[i]->maxusage !=
report->field[i]->report_count) {
pr_debug("maxusage and report_count do not match, skipping\n");
continue;
}
for (j = 0; j < report->field[i]->maxusage; j++) {
if (report->field[i]->usage[j].hid ==
(HID_UP_PID | table[k])) {
pr_debug("found %d at %d->%d\n",
k, i, j);
usage[k].field = report->field[i];
usage[k].value =
&report->field[i]->value[j];
found = 1;
break;
}
}
if (found)
break;
}
if (!found && strict) {
pr_debug("failed to locate %d\n", k);
return -1;
}
}
return 0;
}
/*
* Return index into pidff_reports for the given usage
*/
static int pidff_check_usage(int usage)
{
int i;
for (i = 0; i < sizeof(pidff_reports); i++)
if (usage == (HID_UP_PID | pidff_reports[i]))
return i;
return -1;
}
/*
* Find the reports and fill pidff->reports[]
* report_type specifies either OUTPUT or FEATURE reports
*/
static void pidff_find_reports(struct hid_device *hid, int report_type,
struct pidff_device *pidff)
{
struct hid_report *report;
int i, ret;
list_for_each_entry(report,
&hid->report_enum[report_type].report_list, list) {
if (report->maxfield < 1)
continue;
ret = pidff_check_usage(report->field[0]->logical);
if (ret != -1) {
hid_dbg(hid, "found usage 0x%02x from field->logical\n",
pidff_reports[ret]);
pidff->reports[ret] = report;
continue;
}
/*
* Sometimes logical collections are stacked to indicate
* different usages for the report and the field, in which
* case we want the usage of the parent. However, Linux HID
* implementation hides this fact, so we have to dig it up
* ourselves
*/
i = report->field[0]->usage[0].collection_index;
if (i <= 0 ||
hid->collection[i - 1].type != HID_COLLECTION_LOGICAL)
continue;
ret = pidff_check_usage(hid->collection[i - 1].usage);
if (ret != -1 && !pidff->reports[ret]) {
hid_dbg(hid,
"found usage 0x%02x from collection array\n",
pidff_reports[ret]);
pidff->reports[ret] = report;
}
}
}
/*
* Test if the required reports have been found
*/
static int pidff_reports_ok(struct pidff_device *pidff)
{
int i;
for (i = 0; i <= PID_REQUIRED_REPORTS; i++) {
if (!pidff->reports[i]) {
hid_dbg(pidff->hid, "%d missing\n", i);
return 0;
}
}
return 1;
}
/*
* Find a field with a specific usage within a report
*/
static struct hid_field *pidff_find_special_field(struct hid_report *report,
int usage, int enforce_min)
{
int i;
for (i = 0; i < report->maxfield; i++) {
if (report->field[i]->logical == (HID_UP_PID | usage) &&
report->field[i]->report_count > 0) {
if (!enforce_min ||
report->field[i]->logical_minimum == 1)
return report->field[i];
else {
pr_err("logical_minimum is not 1 as it should be\n");
return NULL;
}
}
}
return NULL;
}
/*
* Fill a pidff->*_id struct table
*/
static int pidff_find_special_keys(int *keys, struct hid_field *fld,
const u8 *usagetable, int count)
{
int i, j;
int found = 0;
for (i = 0; i < count; i++) {
for (j = 0; j < fld->maxusage; j++) {
if (fld->usage[j].hid == (HID_UP_PID | usagetable[i])) {
keys[i] = j + 1;
found++;
break;
}
}
}
return found;
}
#define PIDFF_FIND_SPECIAL_KEYS(keys, field, name) \
pidff_find_special_keys(pidff->keys, pidff->field, pidff_ ## name, \
sizeof(pidff_ ## name))
/*
* Find and check the special fields
*/
static int pidff_find_special_fields(struct pidff_device *pidff)
{
hid_dbg(pidff->hid, "finding special fields\n");
pidff->create_new_effect_type =
pidff_find_special_field(pidff->reports[PID_CREATE_NEW_EFFECT],
0x25, 1);
pidff->set_effect_type =
pidff_find_special_field(pidff->reports[PID_SET_EFFECT],
0x25, 1);
pidff->effect_direction =
pidff_find_special_field(pidff->reports[PID_SET_EFFECT],
0x57, 0);
pidff->device_control =
pidff_find_special_field(pidff->reports[PID_DEVICE_CONTROL],
0x96, 1);
pidff->block_load_status =
pidff_find_special_field(pidff->reports[PID_BLOCK_LOAD],
0x8b, 1);
pidff->effect_operation_status =
pidff_find_special_field(pidff->reports[PID_EFFECT_OPERATION],
0x78, 1);
hid_dbg(pidff->hid, "search done\n");
if (!pidff->create_new_effect_type || !pidff->set_effect_type) {
hid_err(pidff->hid, "effect lists not found\n");
return -1;
}
if (!pidff->effect_direction) {
hid_err(pidff->hid, "direction field not found\n");
return -1;
}
if (!pidff->device_control) {
hid_err(pidff->hid, "device control field not found\n");
return -1;
}
if (!pidff->block_load_status) {
hid_err(pidff->hid, "block load status field not found\n");
return -1;
}
if (!pidff->effect_operation_status) {
hid_err(pidff->hid, "effect operation field not found\n");
return -1;
}
pidff_find_special_keys(pidff->control_id, pidff->device_control,
pidff_device_control,
sizeof(pidff_device_control));
PIDFF_FIND_SPECIAL_KEYS(control_id, device_control, device_control);
if (!PIDFF_FIND_SPECIAL_KEYS(type_id, create_new_effect_type,
effect_types)) {
hid_err(pidff->hid, "no effect types found\n");
return -1;
}
if (PIDFF_FIND_SPECIAL_KEYS(status_id, block_load_status,
block_load_status) !=
sizeof(pidff_block_load_status)) {
hid_err(pidff->hid,
"block load status identifiers not found\n");
return -1;
}
if (PIDFF_FIND_SPECIAL_KEYS(operation_id, effect_operation_status,
effect_operation_status) !=
sizeof(pidff_effect_operation_status)) {
hid_err(pidff->hid, "effect operation identifiers not found\n");
return -1;
}
return 0;
}
/**
* Find the implemented effect types
*/
static int pidff_find_effects(struct pidff_device *pidff,
struct input_dev *dev)
{
int i;
for (i = 0; i < sizeof(pidff_effect_types); i++) {
int pidff_type = pidff->type_id[i];
if (pidff->set_effect_type->usage[pidff_type].hid !=
pidff->create_new_effect_type->usage[pidff_type].hid) {
hid_err(pidff->hid,
"effect type number %d is invalid\n", i);
return -1;
}
}
if (pidff->type_id[PID_CONSTANT])
set_bit(FF_CONSTANT, dev->ffbit);
if (pidff->type_id[PID_RAMP])
set_bit(FF_RAMP, dev->ffbit);
if (pidff->type_id[PID_SQUARE]) {
set_bit(FF_SQUARE, dev->ffbit);
set_bit(FF_PERIODIC, dev->ffbit);
}
if (pidff->type_id[PID_SINE]) {
set_bit(FF_SINE, dev->ffbit);
set_bit(FF_PERIODIC, dev->ffbit);
}
if (pidff->type_id[PID_TRIANGLE]) {
set_bit(FF_TRIANGLE, dev->ffbit);
set_bit(FF_PERIODIC, dev->ffbit);
}
if (pidff->type_id[PID_SAW_UP]) {
set_bit(FF_SAW_UP, dev->ffbit);
set_bit(FF_PERIODIC, dev->ffbit);
}
if (pidff->type_id[PID_SAW_DOWN]) {
set_bit(FF_SAW_DOWN, dev->ffbit);
set_bit(FF_PERIODIC, dev->ffbit);
}
if (pidff->type_id[PID_SPRING])
set_bit(FF_SPRING, dev->ffbit);
if (pidff->type_id[PID_DAMPER])
set_bit(FF_DAMPER, dev->ffbit);
if (pidff->type_id[PID_INERTIA])
set_bit(FF_INERTIA, dev->ffbit);
if (pidff->type_id[PID_FRICTION])
set_bit(FF_FRICTION, dev->ffbit);
return 0;
}
#define PIDFF_FIND_FIELDS(name, report, strict) \
pidff_find_fields(pidff->name, pidff_ ## name, \
pidff->reports[report], \
sizeof(pidff_ ## name), strict)
/*
* Fill and check the pidff_usages
*/
static int pidff_init_fields(struct pidff_device *pidff, struct input_dev *dev)
{
int envelope_ok = 0;
if (PIDFF_FIND_FIELDS(set_effect, PID_SET_EFFECT, 1)) {
hid_err(pidff->hid, "unknown set_effect report layout\n");
return -ENODEV;
}
PIDFF_FIND_FIELDS(block_load, PID_BLOCK_LOAD, 0);
if (!pidff->block_load[PID_EFFECT_BLOCK_INDEX].value) {
hid_err(pidff->hid, "unknown pid_block_load report layout\n");
return -ENODEV;
}
if (PIDFF_FIND_FIELDS(effect_operation, PID_EFFECT_OPERATION, 1)) {
hid_err(pidff->hid, "unknown effect_operation report layout\n");
return -ENODEV;
}
if (PIDFF_FIND_FIELDS(block_free, PID_BLOCK_FREE, 1)) {
hid_err(pidff->hid, "unknown pid_block_free report layout\n");
return -ENODEV;
}
if (!PIDFF_FIND_FIELDS(set_envelope, PID_SET_ENVELOPE, 1))
envelope_ok = 1;
if (pidff_find_special_fields(pidff) || pidff_find_effects(pidff, dev))
return -ENODEV;
if (!envelope_ok) {
if (test_and_clear_bit(FF_CONSTANT, dev->ffbit))
hid_warn(pidff->hid,
"has constant effect but no envelope\n");
if (test_and_clear_bit(FF_RAMP, dev->ffbit))
hid_warn(pidff->hid,
"has ramp effect but no envelope\n");
if (test_and_clear_bit(FF_PERIODIC, dev->ffbit))
hid_warn(pidff->hid,
"has periodic effect but no envelope\n");
}
if (test_bit(FF_CONSTANT, dev->ffbit) &&
PIDFF_FIND_FIELDS(set_constant, PID_SET_CONSTANT, 1)) {
hid_warn(pidff->hid, "unknown constant effect layout\n");
clear_bit(FF_CONSTANT, dev->ffbit);
}
if (test_bit(FF_RAMP, dev->ffbit) &&
PIDFF_FIND_FIELDS(set_ramp, PID_SET_RAMP, 1)) {
hid_warn(pidff->hid, "unknown ramp effect layout\n");
clear_bit(FF_RAMP, dev->ffbit);
}
if ((test_bit(FF_SPRING, dev->ffbit) ||
test_bit(FF_DAMPER, dev->ffbit) ||
test_bit(FF_FRICTION, dev->ffbit) ||
test_bit(FF_INERTIA, dev->ffbit)) &&
PIDFF_FIND_FIELDS(set_condition, PID_SET_CONDITION, 1)) {
hid_warn(pidff->hid, "unknown condition effect layout\n");
clear_bit(FF_SPRING, dev->ffbit);
clear_bit(FF_DAMPER, dev->ffbit);
clear_bit(FF_FRICTION, dev->ffbit);
clear_bit(FF_INERTIA, dev->ffbit);
}
if (test_bit(FF_PERIODIC, dev->ffbit) &&
PIDFF_FIND_FIELDS(set_periodic, PID_SET_PERIODIC, 1)) {
hid_warn(pidff->hid, "unknown periodic effect layout\n");
clear_bit(FF_PERIODIC, dev->ffbit);
}
PIDFF_FIND_FIELDS(pool, PID_POOL, 0);
if (!PIDFF_FIND_FIELDS(device_gain, PID_DEVICE_GAIN, 1))
set_bit(FF_GAIN, dev->ffbit);
return 0;
}
/*
* Reset the device
*/
static void pidff_reset(struct pidff_device *pidff)
{
struct hid_device *hid = pidff->hid;
int i = 0;
pidff->device_control->value[0] = pidff->control_id[PID_RESET];
/* We reset twice as sometimes hid_wait_io isn't waiting long enough */
hid_hw_request(hid, pidff->reports[PID_DEVICE_CONTROL], HID_REQ_SET_REPORT);
hid_hw_wait(hid);
hid_hw_request(hid, pidff->reports[PID_DEVICE_CONTROL], HID_REQ_SET_REPORT);
hid_hw_wait(hid);
pidff->device_control->value[0] =
pidff->control_id[PID_ENABLE_ACTUATORS];
hid_hw_request(hid, pidff->reports[PID_DEVICE_CONTROL], HID_REQ_SET_REPORT);
hid_hw_wait(hid);
/* pool report is sometimes messed up, refetch it */
hid_hw_request(hid, pidff->reports[PID_POOL], HID_REQ_GET_REPORT);
hid_hw_wait(hid);
if (pidff->pool[PID_SIMULTANEOUS_MAX].value) {
while (pidff->pool[PID_SIMULTANEOUS_MAX].value[0] < 2) {
if (i++ > 20) {
hid_warn(pidff->hid,
"device reports %d simultaneous effects\n",
pidff->pool[PID_SIMULTANEOUS_MAX].value[0]);
break;
}
hid_dbg(pidff->hid, "pid_pool requested again\n");
hid_hw_request(hid, pidff->reports[PID_POOL],
HID_REQ_GET_REPORT);
hid_hw_wait(hid);
}
}
}
/*
* Test if autocenter modification is using the supported method
*/
static int pidff_check_autocenter(struct pidff_device *pidff,
struct input_dev *dev)
{
int error;
/*
* Let's find out if autocenter modification is supported
* Specification doesn't specify anything, so we request an
* effect upload and cancel it immediately. If the approved
* effect id was one above the minimum, then we assume the first
* effect id is a built-in spring type effect used for autocenter
*/
error = pidff_request_effect_upload(pidff, 1);
if (error) {
hid_err(pidff->hid, "upload request failed\n");
return error;
}
if (pidff->block_load[PID_EFFECT_BLOCK_INDEX].value[0] ==
pidff->block_load[PID_EFFECT_BLOCK_INDEX].field->logical_minimum + 1) {
pidff_autocenter(pidff, 0xffff);
set_bit(FF_AUTOCENTER, dev->ffbit);
} else {
hid_notice(pidff->hid,
"device has unknown autocenter control method\n");
}
pidff_erase_pid(pidff,
pidff->block_load[PID_EFFECT_BLOCK_INDEX].value[0]);
return 0;
}
/*
* Check if the device is PID and initialize it
*/
int hid_pidff_init(struct hid_device *hid)
{
struct pidff_device *pidff;
struct hid_input *hidinput = list_entry(hid->inputs.next,
struct hid_input, list);
struct input_dev *dev = hidinput->input;
struct ff_device *ff;
int max_effects;
int error;
hid_dbg(hid, "starting pid init\n");
if (list_empty(&hid->report_enum[HID_OUTPUT_REPORT].report_list)) {
hid_dbg(hid, "not a PID device, no output report\n");
return -ENODEV;
}
pidff = kzalloc(sizeof(*pidff), GFP_KERNEL);
if (!pidff)
return -ENOMEM;
pidff->hid = hid;
pidff_find_reports(hid, HID_OUTPUT_REPORT, pidff);
pidff_find_reports(hid, HID_FEATURE_REPORT, pidff);
if (!pidff_reports_ok(pidff)) {
hid_dbg(hid, "reports not ok, aborting\n");
error = -ENODEV;
goto fail;
}
error = pidff_init_fields(pidff, dev);
if (error)
goto fail;
pidff_reset(pidff);
if (test_bit(FF_GAIN, dev->ffbit)) {
pidff_set(&pidff->device_gain[PID_DEVICE_GAIN_FIELD], 0xffff);
hid_hw_request(hid, pidff->reports[PID_DEVICE_GAIN],
HID_REQ_SET_REPORT);
}
error = pidff_check_autocenter(pidff, dev);
if (error)
goto fail;
max_effects =
pidff->block_load[PID_EFFECT_BLOCK_INDEX].field->logical_maximum -
pidff->block_load[PID_EFFECT_BLOCK_INDEX].field->logical_minimum +
1;
hid_dbg(hid, "max effects is %d\n", max_effects);
if (max_effects > PID_EFFECTS_MAX)
max_effects = PID_EFFECTS_MAX;
if (pidff->pool[PID_SIMULTANEOUS_MAX].value)
hid_dbg(hid, "max simultaneous effects is %d\n",
pidff->pool[PID_SIMULTANEOUS_MAX].value[0]);
if (pidff->pool[PID_RAM_POOL_SIZE].value)
hid_dbg(hid, "device memory size is %d bytes\n",
pidff->pool[PID_RAM_POOL_SIZE].value[0]);
if (pidff->pool[PID_DEVICE_MANAGED_POOL].value &&
pidff->pool[PID_DEVICE_MANAGED_POOL].value[0] == 0) {
hid_notice(hid,
"device does not support device managed pool\n");
goto fail;
}
error = input_ff_create(dev, max_effects);
if (error)
goto fail;
ff = dev->ff;
ff->private = pidff;
ff->upload = pidff_upload_effect;
ff->erase = pidff_erase_effect;
ff->set_gain = pidff_set_gain;
ff->set_autocenter = pidff_set_autocenter;
ff->playback = pidff_playback;
hid_info(dev, "Force feedback for USB HID PID devices by Anssi Hannula <anssi.hannula@gmail.com>\n");
return 0;
fail:
kfree(pidff);
return error;
}