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Date: Tue, 9 Aug 2011 15:59:32 +0200
From: Michael Grzeschik <m.grzeschik@...gutronix.de>
To: ashish.jangam@...tcummins.com
Cc: randy.dunlap@...cle.com, dtor@...l.ru, dmitry.torokhov@...il.com,
linaro-dev@...ts.linaro.org, linux-kernel@...r.kernel.org
Subject: [RFC PATCH] da9052_tsi: remove fifo and use delayed work
Remove the coordinate fifo and check for penup with a delayed work,
instead of a watching kernel thread.
Issues:
Sometimes there are well defined jitter values on the x-axys this must
be more investigated. Hint: DA9052_TSI_CONT_A_REG holds some time Adjust
values for TSI_SKIP and TSI_DELAY, which might have to be properly
aligned to the touch events.
Signed-off-by: Michael Grzeschik <m.grzeschik@...gutronix.de>
---
drivers/input/touchscreen/da9052_tsi.c | 245 ++++++++------------------------
1 files changed, 61 insertions(+), 184 deletions(-)
diff --git a/drivers/input/touchscreen/da9052_tsi.c b/drivers/input/touchscreen/da9052_tsi.c
index 91e051a..91d489f 100755
--- a/drivers/input/touchscreen/da9052_tsi.c
+++ b/drivers/input/touchscreen/da9052_tsi.c
@@ -15,47 +15,24 @@
#include <linux/input.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
-#include <linux/freezer.h>
+#include <linux/sched.h>
#include <linux/kthread.h>
-#include <linux/kfifo.h>
#include <linux/mfd/da9052/reg.h>
#include <linux/mfd/da9052/da9052.h>
-#define DA9052_ACTIVE 1
-#define DA9052_INACTIVE 0
-
-#define DA9052_TSI_FIFOSIZE 640
-
-enum {
- DA9052_PEN_IDLE,
- DA9052_PEN_DOWN,
- DA9052_PEN_UP
-};
-
struct da9052_tsi_reg {
u16 x;
u16 y;
};
-struct tsi_thread_type {
- u8 pid;
- u8 state;
- struct completion notifier;
- struct task_struct *thread_task;
-};
-
struct da9052_tsi {
struct da9052 *da9052;
struct input_dev *dev;
- struct tsi_thread_type tsi_pen_state_thread;
- struct tsi_thread_type tsi_filter_thread;
- struct kfifo fifo;
- struct kfifo fifo_buf;
u8 pen_up_detect_interval;
u32 zero_data_cnt;
u32 valid_penup_count;
- u8 pen_state;
+ struct delayed_work work;
int irq_pendwn;
int irq_datardy;
};
@@ -71,6 +48,48 @@ static inline int da9052_ts_stop(struct da9052_tsi *tsi)
return da9052_clear_bits(tsi->da9052, DA9052_TSI_CONT_A_REG, 1 << 0);
}
+static void da9052_work(struct work_struct *work)
+{
+ struct da9052_tsi *tsi = container_of(work, struct da9052_tsi, work.work);
+ struct da9052 *da9052 = tsi->da9052;
+ int ret;
+ uint8_t _v;
+ u16 down;
+
+ ret = da9052_reg_read(tsi->da9052, DA9052_TSI_LSB_REG);
+ if (ret < 0)
+ return;
+
+ _v = (uint8_t) ret;
+ down = ((_v & 0x40) >> 6);
+
+ if (!down) {
+ tsi->da9052->events_mask |= DA9052_E_TSI_READY;
+ tsi->da9052->events_mask &= ~DA9052_E_PEN_DOWN;
+
+ /* Mask TSI_READY event and unmask PEN_DOWN event*/
+ ret = da9052_reg_update(tsi->da9052, DA9052_IRQ_MASK_B_REG, 0x40, 0x80);
+ if (ret < 0)
+ return;
+
+ input_report_abs(tsi->dev, ABS_PRESSURE, 0);
+ input_report_key(tsi->dev, BTN_TOUCH, 1);
+ input_sync(tsi->dev);
+ } else {
+ da9052->events_mask |= DA9052_E_PEN_DOWN;
+ da9052->events_mask &= ~DA9052_E_TSI_READY;
+
+ /* Mask PEN_DOWN event and unmask TSI_READY event*/
+ ret = da9052_reg_update(da9052, DA9052_IRQ_MASK_B_REG, 0x80, 0x40);
+ if (ret < 0)
+ return;
+
+ /* start polling for touch_det to detect release */
+ schedule_delayed_work(&tsi->work, HZ / 50);
+ }
+
+}
+
static irqreturn_t da9052_ts_pendwn_irq(int irq, void *data)
{
struct da9052_tsi *tsi = (struct da9052_tsi *)data;
@@ -86,7 +105,10 @@ static irqreturn_t da9052_ts_pendwn_irq(int irq, void *data)
return IRQ_NONE;
da9052_ts_start(tsi);
- tsi->pen_state = DA9052_PEN_DOWN;
+
+ input_report_abs(tsi->dev, ABS_PRESSURE, 1023);
+ input_report_key(tsi->dev, BTN_TOUCH, 0);
+ input_sync(tsi->dev);
return IRQ_HANDLED;
}
@@ -118,7 +140,10 @@ static int da9052_ts_read(struct da9052_tsi *tsi)
co_ord.x = ((_x << 2) & 0x3fc) | (_v & 0x3);
co_ord.y = ((_y << 2) & 0x3fc) | ((_v & 0xc) >> 2);
- ret = kfifo_in(&tsi->fifo, &co_ord, sizeof(struct da9052_tsi_reg));
+ input_report_abs(tsi->dev, ABS_X, co_ord.x);
+ input_report_abs(tsi->dev, ABS_Y, co_ord.y);
+ input_report_abs(tsi->dev, ABS_PRESSURE, 1023);
+ input_sync(tsi->dev);
return 0;
}
@@ -135,131 +160,10 @@ static irqreturn_t da9052_ts_datardy_irq(int irq, void *data)
return IRQ_NONE;
}
- return IRQ_HANDLED;
-}
-
-/*
-* Two FIFO are been used. FIFO1 is used for detecting pen up and
-* FIFO2 for reporting pen down co-ordinate.
-*/
-void da9052_ts_process_reg_data(struct da9052_tsi *tsi)
-{
- struct da9052_tsi_reg tmp_raw_data;
- u32 reg_data_cnt;
- int ret;
-
- reg_data_cnt = kfifo_len(&tsi->fifo);
-
- while (reg_data_cnt-- > 0) {
- ret = kfifo_out(&tsi->fifo, &tmp_raw_data,
- sizeof(struct da9052_tsi_reg));
- if (ret < 0)
- continue;
- kfifo_in(&tsi->fifo_buf, &tmp_raw_data,
- sizeof(struct da9052_tsi_reg));
- }
- return;
-}
-
-static void da9052_ts_report_penup(struct da9052_tsi *tsi)
-{
- struct input_dev *ip_dev = tsi->dev;
- struct da9052 *da9052 = tsi->da9052;
- ssize_t ret;
-
- ret = da9052_ts_stop(tsi);
- if (ret < 0)
- return;
-
- da9052->events_mask |= DA9052_E_TSI_READY;
- da9052->events_mask &= ~DA9052_E_PEN_DOWN;
-
- /* Mask TSI_READY event and unmask PEN_DOWN event*/
- ret = da9052_reg_update(da9052, DA9052_IRQ_MASK_B_REG, 0x40, 0x80);
- if (ret < 0)
- return;
-
- input_report_abs(ip_dev, BTN_TOUCH, 0);
- input_sync(ip_dev);
-
- tsi->zero_data_cnt = 0;
-}
-
-/*
-* This function detects the pen up state using the kfifo len.
-* If kfifo len is zero for some interval then pen up is reported.
-* Else pen co-ordinate are reported.
-*/
-static int da9052_ts_monitor_pen_state(void *data)
-{
- struct da9052_tsi *tsi = (struct da9052_tsi *) data;
- u32 data_cnt;
-
- set_freezable();
-
- while (tsi->tsi_pen_state_thread.state == DA9052_ACTIVE) {
- try_to_freeze();
-
- set_current_state(TASK_INTERRUPTIBLE);
- schedule_timeout(msecs_to_jiffies(10));
-
- if (tsi->pen_state != DA9052_PEN_DOWN)
- continue;
-
- data_cnt = kfifo_len(&tsi->fifo);
- if (data_cnt < 0)
- continue;
-
- da9052_ts_process_reg_data(tsi);
-
- if (data_cnt)
- tsi->zero_data_cnt = 0;
- else {
- if ((++(tsi->zero_data_cnt)) >
- tsi->valid_penup_count) {
- tsi->pen_state = DA9052_PEN_UP;
- da9052_ts_report_penup(tsi);
- }
- }
- }
-
- complete_and_exit(&tsi->tsi_pen_state_thread.notifier, 0);
- return 0;
-}
-
-static int da9052_ts_process_thread(void *ptr)
-{
- struct da9052_tsi_reg co_ord;
- int cnt = 0, ret;
- struct da9052_tsi *tsi = (struct da9052_tsi *)ptr;
-
- set_freezable();
-
- while (tsi->tsi_filter_thread.state == DA9052_ACTIVE) {
-
- try_to_freeze();
-
- set_current_state(TASK_INTERRUPTIBLE);
- schedule_timeout(msecs_to_jiffies(10));
- cnt = kfifo_len(&tsi->fifo_buf);
- if (cnt <= 0)
- continue;
-
- ret = kfifo_out(&tsi->fifo_buf, &co_ord,
- sizeof(struct da9052_tsi_reg));
- if (ret < 0)
- continue;
-
- input_report_abs(tsi->dev, BTN_TOUCH, 1);
- input_report_abs(tsi->dev, ABS_X, co_ord.x);
- input_report_abs(tsi->dev, ABS_Y, co_ord.y);
- input_sync(tsi->dev);
- }
-
- tsi->tsi_filter_thread.thread_task = NULL;
- complete_and_exit(&tsi->tsi_filter_thread.notifier, 0);
+ /* start polling for touch_det to detect release */
+ schedule_delayed_work(&tsi->work, HZ / 50);
- return 0;
+ return IRQ_HANDLED;
}
static int da9052_ts_configure_gpio(struct da9052 *da9052)
@@ -296,16 +200,6 @@ static int __init da9052_ts_enable_device(struct da9052_tsi *tsi)
tsi->valid_penup_count = 5;
- init_completion(&tsi->tsi_pen_state_thread.notifier);
- tsi->tsi_pen_state_thread.state = DA9052_ACTIVE;
- tsi->tsi_pen_state_thread.pid = kernel_thread(da9052_ts_monitor_pen_state, tsi,
- CLONE_KERNEL | SIGCHLD);
-
- init_completion(&tsi->tsi_filter_thread.notifier);
- tsi->tsi_filter_thread.state = DA9052_ACTIVE;
- tsi->tsi_filter_thread.pid = kernel_thread(da9052_ts_process_thread, tsi,
- CLONE_KERNEL | SIGCHLD);
-
tsi->zero_data_cnt = 0;
/* Measure TSI sample every 1ms */
@@ -354,14 +248,6 @@ static s32 __devinit da9052_ts_probe(struct platform_device *pdev)
goto err_mem;
}
- ret = kfifo_alloc(&tsi->fifo, DA9052_TSI_FIFOSIZE, GFP_KERNEL);
- if (ret < 0)
- goto err_input;
-
- ret = kfifo_alloc(&tsi->fifo_buf, DA9052_TSI_FIFOSIZE, GFP_KERNEL);
- if (ret < 0)
- goto err_fifo;
-
tsi->da9052 = da9052;
tsi->pen_up_detect_interval = 5;
platform_set_drvdata(pdev, tsi);
@@ -388,6 +274,8 @@ static s32 __devinit da9052_ts_probe(struct platform_device *pdev)
if (ret)
goto err_mem;
+ INIT_DELAYED_WORK(&tsi->work, da9052_work);
+
tsi->irq_pendwn = platform_get_irq_byname(pdev, "PENDWN");
ret = request_threaded_irq(tsi->da9052->irq_base + tsi->irq_pendwn,
NULL, da9052_ts_pendwn_irq,
@@ -397,7 +285,7 @@ static s32 __devinit da9052_ts_probe(struct platform_device *pdev)
dev_err(tsi->da9052->dev,
"Failed to register %s IRQ %d, error = %d\n", "PENDWN",
tsi->da9052->irq_base + tsi->irq_pendwn, ret);
- goto err_fifo_buf;
+ goto err_input;
}
tsi->irq_datardy = platform_get_irq_byname(pdev, "TSIRDY");
@@ -409,19 +297,15 @@ static s32 __devinit da9052_ts_probe(struct platform_device *pdev)
dev_err(tsi->da9052->dev,
"Failed to register %s IRQ %d, error = %d\n", "TSIRDY",
tsi->da9052->irq_base + tsi->irq_datardy, ret);
- goto err_fifo_buf;
+ goto err_input;
}
ret = da9052_ts_enable_device(tsi);
if (ret < 0)
- goto err_fifo_buf;
+ goto err_input;
return 0;
-err_fifo_buf:
- kfifo_free(&tsi->fifo_buf);
-err_fifo:
- kfifo_free(&tsi->fifo);
err_input:
input_free_device(input_dev);
err_mem:
@@ -445,18 +329,11 @@ static int __devexit da9052_ts_remove(struct platform_device *pdev)
free_irq(tsi->da9052->irq_base + tsi->irq_pendwn, NULL);
free_irq(tsi->da9052->irq_base + tsi->irq_datardy, NULL);
- tsi->tsi_pen_state_thread.state = DA9052_INACTIVE;
- wait_for_completion(&tsi->tsi_pen_state_thread.notifier);
-
- tsi->tsi_filter_thread.state = DA9052_INACTIVE;
- wait_for_completion(&tsi->tsi_filter_thread.notifier);
-
+ cancel_delayed_work(&tsi->work);
input_unregister_device(tsi->dev);
platform_set_drvdata(pdev, NULL);
- kfifo_free(&tsi->fifo);
- kfifo_free(&tsi->fifo_buf);
kfree(tsi);
return 0;
--
1.7.5.4
--
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