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Input: tsc2005 - don't use work for 'pen up' handling 

We do not need process context to send input events so let's switch to
a regular timer. I am going to get rid of taking ts->mutex in
tsc2005_irq_thread() later.

Tested-by: Aaro Koskinen <aaro.koskinen@nokia.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Dmitry Torokhov 2011-03-16 22:11:08 -07:00
parent 9a6e180af7
commit 80cc2f0c92
1 changed files with 27 additions and 31 deletions
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56
drivers/input/touchscreen/tsc2005.c
View File

@ -129,8 +129,8 @@ struct tsc2005 {
int in_z1;
int in_z2;
spinlock_t lock;
struct timer_list penup_timer;
struct work_struct penup_work;
unsigned int esd_timeout;
struct timer_list esd_timer;
@ -239,11 +239,10 @@ static irqreturn_t tsc2005_irq_handler(int irq, void *dev_id)
static irqreturn_t tsc2005_irq_thread(int irq, void *_ts)
{
struct tsc2005 *ts = _ts;
unsigned long flags;
unsigned int pressure;
u32 x;
u32 y;
u32 z1;
u32 z2;
u32 x, y;
u32 z1, z2;
mutex_lock(&ts->mutex);
@ -261,46 +260,50 @@ static irqreturn_t tsc2005_irq_thread(int irq, void *_ts)
if (unlikely(x > MAX_12BIT || y > MAX_12BIT))
goto out;
/* skip coords if the pressure components are out of range */
/* Skip reading if the pressure components are out of range */
if (unlikely(z1 == 0 || z2 > MAX_12BIT || z1 >= z2))
goto out;
/* skip point if this is a pen down with the exact same values as
/*
* Skip point if this is a pen down with the exact same values as
* the value before pen-up - that implies SPI fed us stale data
*/
if (!ts->pen_down &&
ts->in_x == x &&
ts->in_y == y &&
ts->in_z1 == z1 &&
ts->in_z2 == z2)
ts->in_x == x && ts->in_y == y &&
ts->in_z1 == z1 && ts->in_z2 == z2) {
goto out;
}
/* At this point we are happy we have a valid and useful reading.
* Remember it for later comparisons. We may now begin downsampling
/*
* At this point we are happy we have a valid and useful reading.
* Remember it for later comparisons. We may now begin downsampling.
*/
ts->in_x = x;
ts->in_y = y;
ts->in_z1 = z1;
ts->in_z2 = z2;
/* compute touch pressure resistance using equation #1 */
/* Compute touch pressure resistance using equation #1 */
pressure = x * (z2 - z1) / z1;
pressure = pressure * ts->x_plate_ohm / 4096;
if (unlikely(pressure > MAX_12BIT))
goto out;
spin_lock_irqsave(&ts->lock, flags);
tsc2005_update_pen_state(ts, x, y, pressure);
/* set the penup timer */
mod_timer(&ts->penup_timer,
jiffies + msecs_to_jiffies(TSC2005_PENUP_TIME_MS));
if (!ts->esd_timeout)
goto out;
if (ts->esd_timeout && ts->set_reset) {
/* update the watchdog timer */
mod_timer(&ts->esd_timer,
round_jiffies(jiffies + msecs_to_jiffies(ts->esd_timeout)));
mod_timer(&ts->esd_timer, round_jiffies(jiffies +
msecs_to_jiffies(ts->esd_timeout)));
}
spin_unlock_irqrestore(&ts->lock, flags);
out:
mutex_unlock(&ts->mutex);
@ -310,17 +313,11 @@ out:
static void tsc2005_penup_timer(unsigned long data)
{
struct tsc2005 *ts = (struct tsc2005 *)data;
unsigned long flags;
schedule_work(&ts->penup_work);
}
static void tsc2005_penup_work(struct work_struct *work)
{
struct tsc2005 *ts = container_of(work, struct tsc2005, penup_work);
mutex_lock(&ts->mutex);
spin_lock_irqsave(&ts->lock, flags);
tsc2005_update_pen_state(ts, 0, 0, 0);
mutex_unlock(&ts->mutex);
spin_unlock_irqrestore(&ts->lock, flags);
}
static void tsc2005_start_scan(struct tsc2005 *ts)
@ -577,8 +574,8 @@ static int __devinit tsc2005_probe(struct spi_device *spi)
mutex_init(&ts->mutex);
spin_lock_init(&ts->lock);
setup_timer(&ts->penup_timer, tsc2005_penup_timer, (unsigned long)ts);
INIT_WORK(&ts->penup_work, tsc2005_penup_work);
setup_timer(&ts->esd_timer, tsc2005_esd_timer, (unsigned long)ts);
INIT_WORK(&ts->esd_work, tsc2005_esd_work);
@ -659,7 +656,6 @@ static int __devexit tsc2005_remove(struct spi_device *spi)
del_timer_sync(&ts->penup_timer);
flush_work(&ts->esd_work);
flush_work(&ts->penup_work);
free_irq(ts->spi->irq, ts);
input_unregister_device(ts->idev);