From 75fba3b05d6ed82b975c1f8df8f8e08d5d81dee5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Richard=20R=C3=B6jfors?=
<richard.rojfors.ext@mocean-labs.com>
Date: Fri, 24 Jul 2009 22:01:39 -0700
Subject: [PATCH] Input: tsc2007 - remove HR timer
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Since it's not allowed to do synchronous I2C in the HR timer callback
context we have to switch to using the global workqueue. The work is
scheduled every 1ms when polling rather than 5 us.
Signed-off-by: Richard Röjfors <richard.rojfors.ext@mocean-labs.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
---
drivers/input/touchscreen/tsc2007.c | 48 ++++++++---------------------
1 file changed, 13 insertions(+), 35 deletions(-)
diff --git a/drivers/input/touchscreen/tsc2007.c b/drivers/input/touchscreen/tsc2007.c
index 880f58c6a7c4..b512697b227d 100644
--- a/drivers/input/touchscreen/tsc2007.c
+++ b/drivers/input/touchscreen/tsc2007.c
@@ -21,15 +21,13 @@
*/
#include <linux/module.h>
-#include <linux/hrtimer.h>
#include <linux/slab.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/i2c.h>
#include <linux/i2c/tsc2007.h>
-#define TS_POLL_DELAY (10 * 1000) /* ns delay before the first sample */
-#define TS_POLL_PERIOD (5 * 1000) /* ns delay between samples */
+#define TS_POLL_PERIOD msecs_to_jiffies(1) /* ms delay between samples */
#define TSC2007_MEASURE_TEMP0 (0x0 << 4)
#define TSC2007_MEASURE_AUX (0x2 << 4)
@@ -70,13 +68,11 @@ struct ts_event {
struct tsc2007 {
struct input_dev *input;
char phys[32];
- struct hrtimer timer;
+ struct delayed_work work;
struct ts_event tc;
struct i2c_client *client;
- spinlock_t lock;
-
u16 model;
u16 x_plate_ohms;
@@ -142,8 +138,7 @@ static void tsc2007_send_event(void *tsc)
if (rt > MAX_12BIT) {
dev_dbg(&ts->client->dev, "ignored pressure %d\n", rt);
- hrtimer_start(&ts->timer, ktime_set(0, TS_POLL_PERIOD),
- HRTIMER_MODE_REL);
+ schedule_delayed_work(&ts->work, TS_POLL_PERIOD);
return;
}
@@ -153,7 +148,7 @@ static void tsc2007_send_event(void *tsc)
* in some cases may not even settle at the expected value.
*
* The only safe way to check for the pen up condition is in the
- * timer by reading the pen signal state (it's a GPIO _and_ IRQ).
+ * work function by reading the pen signal state (it's a GPIO and IRQ).
*/
if (rt) {
struct input_dev *input = ts->input;
@@ -175,8 +170,7 @@ static void tsc2007_send_event(void *tsc)
x, y, rt);
}
- hrtimer_start(&ts->timer, ktime_set(0, TS_POLL_PERIOD),
- HRTIMER_MODE_REL);
+ schedule_delayed_work(&ts->work, TS_POLL_PERIOD);
}
static int tsc2007_read_values(struct tsc2007 *tsc)
@@ -197,13 +191,10 @@ static int tsc2007_read_values(struct tsc2007 *tsc)
return 0;
}
-static enum hrtimer_restart tsc2007_timer(struct hrtimer *handle)
+static void tsc2007_work(struct work_struct *work)
{
- struct tsc2007 *ts = container_of(handle, struct tsc2007, timer);
- unsigned long flags;
-
- spin_lock_irqsave(&ts->lock, flags);
-
+ struct tsc2007 *ts =
+ container_of(to_delayed_work(work), struct tsc2007, work);
if (unlikely(!ts->get_pendown_state() && ts->pendown)) {
struct input_dev *input = ts->input;
@@ -222,30 +213,20 @@ static enum hrtimer_restart tsc2007_timer(struct hrtimer *handle)
tsc2007_read_values(ts);
tsc2007_send_event(ts);
}
-
- spin_unlock_irqrestore(&ts->lock, flags);
-
- return HRTIMER_NORESTART;
}
static irqreturn_t tsc2007_irq(int irq, void *handle)
{
struct tsc2007 *ts = handle;
- unsigned long flags;
-
- spin_lock_irqsave(&ts->lock, flags);
if (likely(ts->get_pendown_state())) {
disable_irq_nosync(ts->irq);
- hrtimer_start(&ts->timer, ktime_set(0, TS_POLL_DELAY),
- HRTIMER_MODE_REL);
+ schedule_delayed_work(&ts->work, 0);
}
if (ts->clear_penirq)
ts->clear_penirq();
- spin_unlock_irqrestore(&ts->lock, flags);
-
return IRQ_HANDLED;
}
@@ -278,11 +259,6 @@ static int tsc2007_probe(struct i2c_client *client,
ts->input = input_dev;
- hrtimer_init(&ts->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
- ts->timer.function = tsc2007_timer;
-
- spin_lock_init(&ts->lock);
-
ts->model = pdata->model;
ts->x_plate_ohms = pdata->x_plate_ohms;
ts->get_pendown_state = pdata->get_pendown_state;
@@ -308,6 +284,8 @@ static int tsc2007_probe(struct i2c_client *client,
ts->irq = client->irq;
+ INIT_DELAYED_WORK(&ts->work, tsc2007_work);
+
err = request_irq(ts->irq, tsc2007_irq, 0,
client->dev.driver->name, ts);
if (err < 0) {
@@ -325,7 +303,6 @@ static int tsc2007_probe(struct i2c_client *client,
err_free_irq:
free_irq(ts->irq, ts);
- hrtimer_cancel(&ts->timer);
err_free_mem:
input_free_device(input_dev);
kfree(ts);
@@ -337,11 +314,12 @@ static int tsc2007_remove(struct i2c_client *client)
struct tsc2007 *ts = i2c_get_clientdata(client);
struct tsc2007_platform_data *pdata;
+ cancel_delayed_work_sync(&ts->work);
+
pdata = client->dev.platform_data;
pdata->exit_platform_hw();
free_irq(ts->irq, ts);
- hrtimer_cancel(&ts->timer);
input_unregister_device(ts->input);
kfree(ts);
--
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