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Subject[patch 06/11] input: adapt iforce driver for the new force feedback interface
Modify the iforce driver for the new force feedback interface.

Signed-off-by: Anssi Hannula <anssi.hannula@gmail.com>

---
drivers/input/joystick/iforce/Kconfig | 2
drivers/input/joystick/iforce/iforce-ff.c | 61 +++------
drivers/input/joystick/iforce/iforce-main.c | 188 ++++++++--------------------
drivers/input/joystick/iforce/iforce.h | 15 --
4 files changed, 87 insertions(+), 179 deletions(-)

Index: linux-2.6.17-rc4-git1/drivers/input/joystick/iforce/iforce-ff.c
===================================================================
--- linux-2.6.17-rc4-git1.orig/drivers/input/joystick/iforce/iforce-ff.c 2006-05-14 01:36:21.000000000 +0300
+++ linux-2.6.17-rc4-git1/drivers/input/joystick/iforce/iforce-ff.c 2006-05-14 01:42:00.000000000 +0300
@@ -198,10 +198,8 @@ static unsigned char find_button(struct
* Analyse the changes in an effect, and tell if we need to send an condition
* parameter packet
*/
-static int need_condition_modifier(struct iforce* iforce, struct ff_effect* new)
+static int need_condition_modifier(struct ff_effect* old, struct ff_effect* new)
{
- int id = new->id;
- struct ff_effect* old = &iforce->core_effects[id].effect;
int ret=0;
int i;

@@ -225,11 +223,8 @@ static int need_condition_modifier(struc
* Analyse the changes in an effect, and tell if we need to send a magnitude
* parameter packet
*/
-static int need_magnitude_modifier(struct iforce* iforce, struct ff_effect* effect)
+static int need_magnitude_modifier(struct ff_effect* old, struct ff_effect* effect)
{
- int id = effect->id;
- struct ff_effect* old = &iforce->core_effects[id].effect;
-
if (effect->type != FF_CONSTANT) {
printk(KERN_WARNING "iforce.c: bad effect type in need_envelope_modifier\n");
return FALSE;
@@ -242,11 +237,8 @@ static int need_magnitude_modifier(struc
* Analyse the changes in an effect, and tell if we need to send an envelope
* parameter packet
*/
-static int need_envelope_modifier(struct iforce* iforce, struct ff_effect* effect)
+static int need_envelope_modifier(struct ff_effect* old, struct ff_effect* effect)
{
- int id = effect->id;
- struct ff_effect* old = &iforce->core_effects[id].effect;
-
switch (effect->type) {
case FF_CONSTANT:
if (old->u.constant.envelope.attack_length != effect->u.constant.envelope.attack_length
@@ -275,16 +267,12 @@ static int need_envelope_modifier(struct
* Analyse the changes in an effect, and tell if we need to send a periodic
* parameter effect
*/
-static int need_period_modifier(struct iforce* iforce, struct ff_effect* new)
+static int need_period_modifier(struct ff_effect* old, struct ff_effect* new)
{
- int id = new->id;
- struct ff_effect* old = &iforce->core_effects[id].effect;
-
if (new->type != FF_PERIODIC) {
- printk(KERN_WARNING "iforce.c: bad effect type in need_periodic_modifier\n");
+ printk(KERN_WARNING "iforce.c: bad effect type in need_period_modifier\n");
return FALSE;
}
-
return (old->u.periodic.period != new->u.periodic.period
|| old->u.periodic.magnitude != new->u.periodic.magnitude
|| old->u.periodic.offset != new->u.periodic.offset
@@ -295,11 +283,8 @@ static int need_period_modifier(struct i
* Analyse the changes in an effect, and tell if we need to send an effect
* packet
*/
-static int need_core(struct iforce* iforce, struct ff_effect* new)
+static int need_core(struct ff_effect* old, struct ff_effect* new)
{
- int id = new->id;
- struct ff_effect* old = &iforce->core_effects[id].effect;
-
if (old->direction != new->direction
|| old->trigger.button != new->trigger.button
|| old->trigger.interval != new->trigger.interval
@@ -360,7 +345,7 @@ static int make_core(struct iforce* ifor
* Upload a periodic effect to the device
* See also iforce_upload_constant.
*/
-int iforce_upload_periodic(struct iforce* iforce, struct ff_effect* effect, int is_update)
+int iforce_upload_periodic(struct iforce* iforce, struct ff_effect* effect, struct ff_effect *old)
{
u8 wave_code;
int core_id = effect->id;
@@ -371,18 +356,18 @@ int iforce_upload_periodic(struct iforce
int param2_err = 1;
int core_err = 0;

- if (!is_update || need_period_modifier(iforce, effect)) {
+ if (!old || need_period_modifier(old, effect)) {
param1_err = make_period_modifier(iforce, mod1_chunk,
- is_update,
+ old ? 1 : 0,
effect->u.periodic.magnitude, effect->u.periodic.offset,
effect->u.periodic.period, effect->u.periodic.phase);
if (param1_err) return param1_err;
set_bit(FF_MOD1_IS_USED, core_effect->flags);
}

- if (!is_update || need_envelope_modifier(iforce, effect)) {
+ if (!old || need_envelope_modifier(old, effect)) {
param2_err = make_envelope_modifier(iforce, mod2_chunk,
- is_update,
+ old ? 1 : 0,
effect->u.periodic.envelope.attack_length,
effect->u.periodic.envelope.attack_level,
effect->u.periodic.envelope.fade_length,
@@ -400,7 +385,7 @@ int iforce_upload_periodic(struct iforce
default: wave_code = 0x20; break;
}

- if (!is_update || need_core(iforce, effect)) {
+ if (!old || need_core(old, effect)) {
core_err = make_core(iforce, effect->id,
mod1_chunk->start,
mod2_chunk->start,
@@ -429,7 +414,7 @@ int iforce_upload_periodic(struct iforce
* 0 Ok, effect created or updated
* 1 effect did not change since last upload, and no packet was therefore sent
*/
-int iforce_upload_constant(struct iforce* iforce, struct ff_effect* effect, int is_update)
+int iforce_upload_constant(struct iforce* iforce, struct ff_effect* effect, struct ff_effect* old)
{
int core_id = effect->id;
struct iforce_core_effect* core_effect = iforce->core_effects + core_id;
@@ -439,17 +424,17 @@ int iforce_upload_constant(struct iforce
int param2_err = 1;
int core_err = 0;

- if (!is_update || need_magnitude_modifier(iforce, effect)) {
+ if (!old || need_magnitude_modifier(old, effect)) {
param1_err = make_magnitude_modifier(iforce, mod1_chunk,
- is_update,
+ old ? 1 : 0,
effect->u.constant.level);
if (param1_err) return param1_err;
set_bit(FF_MOD1_IS_USED, core_effect->flags);
}

- if (!is_update || need_envelope_modifier(iforce, effect)) {
+ if (!old || need_envelope_modifier(old, effect)) {
param2_err = make_envelope_modifier(iforce, mod2_chunk,
- is_update,
+ old ? 1 : 0,
effect->u.constant.envelope.attack_length,
effect->u.constant.envelope.attack_level,
effect->u.constant.envelope.fade_length,
@@ -458,7 +443,7 @@ int iforce_upload_constant(struct iforce
set_bit(FF_MOD2_IS_USED, core_effect->flags);
}

- if (!is_update || need_core(iforce, effect)) {
+ if (!old || need_core(old, effect)) {
core_err = make_core(iforce, effect->id,
mod1_chunk->start,
mod2_chunk->start,
@@ -483,7 +468,7 @@ int iforce_upload_constant(struct iforce
/*
* Upload an condition effect. Those are for example friction, inertia, springs...
*/
-int iforce_upload_condition(struct iforce* iforce, struct ff_effect* effect, int is_update)
+int iforce_upload_condition(struct iforce* iforce, struct ff_effect* effect, struct ff_effect* old)
{
int core_id = effect->id;
struct iforce_core_effect* core_effect = iforce->core_effects + core_id;
@@ -499,9 +484,9 @@ int iforce_upload_condition(struct iforc
default: return -1;
}

- if (!is_update || need_condition_modifier(iforce, effect)) {
+ if (!old || need_condition_modifier(old, effect)) {
param_err = make_condition_modifier(iforce, mod1_chunk,
- is_update,
+ old ? 1 : 0,
effect->u.condition[0].right_saturation,
effect->u.condition[0].left_saturation,
effect->u.condition[0].right_coeff,
@@ -512,7 +497,7 @@ int iforce_upload_condition(struct iforc
set_bit(FF_MOD1_IS_USED, core_effect->flags);

param_err = make_condition_modifier(iforce, mod2_chunk,
- is_update,
+ old ? 1 : 0,
effect->u.condition[1].right_saturation,
effect->u.condition[1].left_saturation,
effect->u.condition[1].right_coeff,
@@ -524,7 +509,7 @@ int iforce_upload_condition(struct iforc

}

- if (!is_update || need_core(iforce, effect)) {
+ if (!old || need_core(old, effect)) {
core_err = make_core(iforce, effect->id,
mod1_chunk->start, mod2_chunk->start,
type, 0xc0,
Index: linux-2.6.17-rc4-git1/drivers/input/joystick/iforce/iforce.h
===================================================================
--- linux-2.6.17-rc4-git1.orig/drivers/input/joystick/iforce/iforce.h 2006-05-14 01:36:21.000000000 +0300
+++ linux-2.6.17-rc4-git1/drivers/input/joystick/iforce/iforce.h 2006-05-14 01:42:00.000000000 +0300
@@ -55,7 +55,7 @@
#define FALSE 0
#define TRUE 1

-#define FF_EFFECTS_MAX 32
+#define IFORCE_EFFECTS_MAX 32

/* Each force feedback effect is made of one core effect, which can be
* associated to at most to effect modifiers
@@ -79,13 +79,6 @@ struct iforce_core_effect {
struct resource mod1_chunk;
struct resource mod2_chunk;
unsigned long flags[NBITS(FF_MODCORE_MAX)];
- pid_t owner;
- /* Used to keep track of parameters of an effect. They are needed
- * to know what parts of an effect changed in an update operation.
- * We try to send only parameter packets if possible, as sending
- * effect parameter requires the effect to be stoped and restarted
- */
- struct ff_effect effect;
};

#define FF_CMD_EFFECT 0x010e
@@ -183,9 +176,9 @@ void iforce_dump_packet(char *msg, u16 c
int iforce_get_id_packet(struct iforce *iforce, char *packet);

/* iforce-ff.c */
-int iforce_upload_periodic(struct iforce*, struct ff_effect*, int is_update);
-int iforce_upload_constant(struct iforce*, struct ff_effect*, int is_update);
-int iforce_upload_condition(struct iforce*, struct ff_effect*, int is_update);
+int iforce_upload_periodic(struct iforce*, struct ff_effect*, struct ff_effect* old);
+int iforce_upload_constant(struct iforce*, struct ff_effect*, struct ff_effect* old);
+int iforce_upload_condition(struct iforce*, struct ff_effect*, struct ff_effect* old);

/* Public variables */
extern struct serio_driver iforce_serio_drv;
Index: linux-2.6.17-rc4-git1/drivers/input/joystick/iforce/iforce-main.c
===================================================================
--- linux-2.6.17-rc4-git1.orig/drivers/input/joystick/iforce/iforce-main.c 2006-05-14 01:36:21.000000000 +0300
+++ linux-2.6.17-rc4-git1/drivers/input/joystick/iforce/iforce-main.c 2006-05-14 01:42:00.000000000 +0300
@@ -82,103 +82,57 @@ static struct iforce_device iforce_devic
{ 0x0000, 0x0000, "Unknown I-Force Device [%04x:%04x]", btn_joystick, abs_joystick, ff_iforce }
};

+static int iforce_playback(struct input_dev *dev, int effect_id, int value)
+{
+ struct iforce* iforce = (struct iforce*)(dev->private);
+ if (value > 0) {
+ set_bit(FF_CORE_SHOULD_PLAY, iforce->core_effects[effect_id].flags);
+ }
+ else {
+ clear_bit(FF_CORE_SHOULD_PLAY, iforce->core_effects[effect_id].flags);
+ }

+ iforce_control_playback(iforce, effect_id, value);
+ return 0;
+}

-static int iforce_input_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
+static void iforce_set_gain(struct input_dev *dev, u16 gain)
{
struct iforce* iforce = (struct iforce*)(dev->private);
unsigned char data[3];
+ data[0] = gain >> 9;
+ iforce_send_packet(iforce, FF_CMD_GAIN, data);
+}

- if (type != EV_FF)
- return -1;
-
- switch (code) {
-
- case FF_GAIN:
-
- data[0] = value >> 9;
- iforce_send_packet(iforce, FF_CMD_GAIN, data);
-
- return 0;
-
- case FF_AUTOCENTER:
-
- data[0] = 0x03;
- data[1] = value >> 9;
- iforce_send_packet(iforce, FF_CMD_AUTOCENTER, data);
-
- data[0] = 0x04;
- data[1] = 0x01;
- iforce_send_packet(iforce, FF_CMD_AUTOCENTER, data);
-
- return 0;
-
- default: /* Play or stop an effect */
-
- if (!CHECK_OWNERSHIP(code, iforce)) {
- return -1;
- }
- if (value > 0) {
- set_bit(FF_CORE_SHOULD_PLAY, iforce->core_effects[code].flags);
- }
- else {
- clear_bit(FF_CORE_SHOULD_PLAY, iforce->core_effects[code].flags);
- }
-
- iforce_control_playback(iforce, code, value);
- return 0;
- }
-
- return -1;
+static void iforce_set_autocenter(struct input_dev *dev, u16 magnitude)
+{
+ struct iforce* iforce = (struct iforce*)(dev->private);
+ unsigned char data[3];
+ data[0] = 0x03;
+ data[1] = magnitude >> 9;
+ iforce_send_packet(iforce, FF_CMD_AUTOCENTER, data);
+
+ data[0] = 0x04;
+ data[1] = 0x01;
+ iforce_send_packet(iforce, FF_CMD_AUTOCENTER, data);
}

/*
* Function called when an ioctl is performed on the event dev entry.
* It uploads an effect to the device
*/
-static int iforce_upload_effect(struct input_dev *dev, struct ff_effect *effect)
+static int iforce_upload_effect(struct input_dev *dev, struct ff_effect *effect, struct ff_effect *old)
{
struct iforce* iforce = (struct iforce*)(dev->private);
- int id;
int ret;
- int is_update;
-
-/* Check this effect type is supported by this device */
- if (!test_bit(effect->type, iforce->dev->ffbit))
- return -EINVAL;
-
-/*
- * If we want to create a new effect, get a free id
- */
- if (effect->id == -1) {
-
- for (id = 0; id < FF_EFFECTS_MAX; ++id)
- if (!test_and_set_bit(FF_CORE_IS_USED, iforce->core_effects[id].flags))
- break;
-
- if (id == FF_EFFECTS_MAX || id >= iforce->dev->ff_effects_max)
- return -ENOMEM;

- effect->id = id;
- iforce->core_effects[id].owner = current->pid;
- iforce->core_effects[id].flags[0] = (1 << FF_CORE_IS_USED); /* Only IS_USED bit must be set */
-
- is_update = FALSE;
+ if (!old) {
+ iforce->core_effects[effect->id].flags[0] = (1 << FF_CORE_IS_USED); /* Only IS_USED bit must be set */
}
else {
- /* We want to update an effect */
- if (!CHECK_OWNERSHIP(effect->id, iforce))
- return -EACCES;
-
- /* Parameter type cannot be updated */
- if (effect->type != iforce->core_effects[effect->id].effect.type)
- return -EINVAL;
-
/* Check the effect is not already being updated */
if (test_bit(FF_CORE_UPDATE, iforce->core_effects[effect->id].flags))
return -EAGAIN;
-
- is_update = TRUE;
}

/*
@@ -187,16 +141,16 @@ static int iforce_upload_effect(struct i
switch (effect->type) {

case FF_PERIODIC:
- ret = iforce_upload_periodic(iforce, effect, is_update);
+ ret = iforce_upload_periodic(iforce, effect, old);
break;

case FF_CONSTANT:
- ret = iforce_upload_constant(iforce, effect, is_update);
+ ret = iforce_upload_constant(iforce, effect, old);
break;

case FF_SPRING:
case FF_DAMPER:
- ret = iforce_upload_condition(iforce, effect, is_update);
+ ret = iforce_upload_condition(iforce, effect, old);
break;

default:
@@ -208,7 +162,6 @@ static int iforce_upload_effect(struct i
*/
set_bit(FF_CORE_UPDATE, iforce->core_effects[effect->id].flags);
}
- iforce->core_effects[effect->id].effect = *effect;
return ret;
}

@@ -222,15 +175,6 @@ static int iforce_erase_effect(struct in
int err = 0;
struct iforce_core_effect* core_effect;

- /* Check who is trying to erase this effect */
- if (iforce->core_effects[effect_id].owner != current->pid) {
- printk(KERN_WARNING "iforce-main.c: %d tried to erase an effect belonging to %d\n", current->pid, iforce->core_effects[effect_id].owner);
- return -EACCES;
- }
-
- if (effect_id < 0 || effect_id >= FF_EFFECTS_MAX)
- return -EINVAL;
-
core_effect = iforce->core_effects + effect_id;

if (test_bit(FF_MOD1_IS_USED, core_effect->flags))
@@ -265,30 +209,6 @@ static int iforce_open(struct input_dev
return 0;
}

-static int iforce_flush(struct input_dev *dev, struct file *file)
-{
- struct iforce *iforce = dev->private;
- int i;
-
- /* Erase all effects this process owns */
- for (i=0; i<dev->ff_effects_max; ++i) {
-
- if (test_bit(FF_CORE_IS_USED, iforce->core_effects[i].flags) &&
- current->pid == iforce->core_effects[i].owner) {
-
- /* Stop effect */
- input_report_ff(dev, i, 0);
-
- /* Free ressources assigned to effect */
- if (iforce_erase_effect(dev, i)) {
- printk(KERN_WARNING "iforce_flush: erase effect %d failed\n", i);
- }
- }
-
- }
- return 0;
-}
-
static void iforce_release(struct input_dev *dev)
{
struct iforce *iforce = dev->private;
@@ -302,7 +222,6 @@ static void iforce_release(struct input_
if (i<dev->ff_effects_max) {
printk(KERN_WARNING "iforce_release: Device still owns effects\n");
}
-
/* Disable force feedback playback */
iforce_send_packet(iforce, FF_CMD_ENABLE, "\001");

@@ -338,11 +257,19 @@ void iforce_delete_device(struct iforce
}
}

+static struct ff_driver iforce_ff_driver = {
+ .upload = iforce_upload_effect,
+ .erase = iforce_erase_effect,
+ .set_gain = iforce_set_gain,
+ .set_autocenter = iforce_set_autocenter,
+ .playback = iforce_playback,
+};
+
int iforce_init_device(struct iforce *iforce)
{
struct input_dev *input_dev;
unsigned char c[] = "CEOV";
- int i;
+ int i, ff_err;

input_dev = input_allocate_device();
if (!input_dev)
@@ -354,6 +281,8 @@ int iforce_init_device(struct iforce *if
iforce->xmit.buf = iforce->xmit_data;
iforce->dev = input_dev;

+ ff_err = input_ff_allocate(input_dev);
+
/*
* Input device fields.
*/
@@ -377,11 +306,8 @@ int iforce_init_device(struct iforce *if
input_dev->name = "Unknown I-Force device";
input_dev->open = iforce_open;
input_dev->close = iforce_release;
- input_dev->flush = iforce_flush;
- input_dev->event = iforce_input_event;
- input_dev->upload_effect = iforce_upload_effect;
- input_dev->erase_effect = iforce_erase_effect;
- input_dev->ff_effects_max = 10;
+ if (!ff_err)
+ input_dev->ff_effects_max = 10;

/*
* On-device memory allocation.
@@ -428,16 +354,17 @@ int iforce_init_device(struct iforce *if
else
printk(KERN_WARNING "iforce-main.c: Device does not respond to id packet B\n");

- if (!iforce_get_id_packet(iforce, "N"))
- iforce->dev->ff_effects_max = iforce->edata[1];
- else
+ if (!iforce_get_id_packet(iforce, "N")) {
+ if (!ff_err)
+ iforce->dev->ff_effects_max = iforce->edata[1];
+ } else
printk(KERN_WARNING "iforce-main.c: Device does not respond to id packet N\n");

/* Check if the device can store more effects than the driver can really handle */
- if (iforce->dev->ff_effects_max > FF_EFFECTS_MAX) {
+ if (!ff_err && iforce->dev->ff_effects_max > IFORCE_EFFECTS_MAX) {
printk(KERN_WARNING "input??: Device can handle %d effects, but N_EFFECTS_MAX is set to %d in iforce.h\n",
- iforce->dev->ff_effects_max, FF_EFFECTS_MAX);
- iforce->dev->ff_effects_max = FF_EFFECTS_MAX;
+ iforce->dev->ff_effects_max, IFORCE_EFFECTS_MAX);
+ iforce->dev->ff_effects_max = IFORCE_EFFECTS_MAX;
}

/*
@@ -471,7 +398,7 @@ int iforce_init_device(struct iforce *if
* Set input device bitfields and ranges.
*/

- input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS) | BIT(EV_FF) | BIT(EV_FF_STATUS);
+ input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS) | BIT(EV_FF_STATUS);

for (i = 0; iforce->type->btn[i] >= 0; i++) {
signed short t = iforce->type->btn[i];
@@ -515,8 +442,11 @@ int iforce_init_device(struct iforce *if
}
}

- for (i = 0; iforce->type->ff[i] >= 0; i++)
- set_bit(iforce->type->ff[i], input_dev->ffbit);
+ if (!ff_err) {
+ for (i = 0; iforce->type->ff[i] >= 0; i++)
+ set_bit(iforce->type->ff[i], input_dev->ff->flags);
+ input_ff_register(input_dev, &iforce_ff_driver);
+ }

/*
* Register input device.
Index: linux-2.6.17-rc4-git1/drivers/input/joystick/iforce/Kconfig
===================================================================
--- linux-2.6.17-rc4-git1.orig/drivers/input/joystick/iforce/Kconfig 2006-05-15 22:16:40.000000000 +0300
+++ linux-2.6.17-rc4-git1/drivers/input/joystick/iforce/Kconfig 2006-05-15 22:16:56.000000000 +0300
@@ -3,7 +3,7 @@
#
config JOYSTICK_IFORCE
tristate "I-Force devices"
- depends on INPUT && INPUT_JOYSTICK
+ depends on INPUT && INPUT_JOYSTICK && (INPUT_FF_EFFECTS || INPUT_FF_EFFECTS=n)
help
Say Y here if you have an I-Force joystick or steering wheel

--
Anssi Hannula
-
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