Hi Michael,
Could you put a simple description in the log on what this patch fixes?
LKML maintainers may reject patches without understandable comments.
Thanks
Sonic
________________________________
From: [email protected]
[mailto:[email protected]] On Behalf Of
[email protected]
Sent: Monday, March 09, 2009 11:20 PM
To: [email protected]
Subject: [Linux-kernel-commits]
[6165]trunk/drivers/input/touchscreen/ad7877.c: Apply
Revision
6165
<http://blackfin.uclinux.org/gf/project/linux-kernel/scmsvn/?action=brow
se&path=/&view=rev&root=linux-kernel&revision=6165>
Author
hennerich
<http://blackfin.uclinux.org/gf/user/hennerich/>
Date
2009-03-09 10:19:39 -0500 (Mon, 09 Mar 2009)
Log Message
Apply
Input: ad7877 fixups
Signed-off-by: Dmitry Torokhov <[email protected]>
Modified Paths
* trunk/drivers/input/touchscreen/ad7877.c
Diff
Modified: trunk/drivers/input/touchscreen/ad7877.c (6164 =>
6165)
--- trunk/drivers/input/touchscreen/ad7877.c 2009-03-09
08:00:18 UTC (rev 6164)
+++ trunk/drivers/input/touchscreen/ad7877.c 2009-03-09
15:19:39 UTC (rev 6165)
@@ -1,7 +1,7 @@
/*
* File: drivers/input/touchscreen/ad7877.c
*
- * Based on: ads7846.c
+ * Based on: ads7846.c
*
* Copyright (C) 2006-2008 Michael Hennerich,
Analog Devices Inc.
*
@@ -185,21 +185,24 @@
u8 averaging;
u8 pen_down_acc_interval;
- u16
conversion_data[AD7877_NR_SENSE];
+ u16
conversion_data[AD7877_NR_SENSE];
struct spi_transfer xfer[AD7877_NR_SENSE + 2];
struct spi_message msg;
+ struct mutex mutex;
+ unsigned disabled:1; /* P: mutex */
+ unsigned gpio3:1; /* P: mutex */
+ unsigned gpio4:1; /* P: mutex */
+
spinlock_t lock;
struct timer_list timer; /* P: lock */
- unsigned pendown:1; /* P: lock */
unsigned pending:1; /* P: lock */
- unsigned disabled:1;
- unsigned gpio3:1;
- unsigned gpio4:1;
};
static int gpio3;
+module_param(gpio3, int, 0);
+MODULE_PARM_DESC(gpio3, "If gpio3 is set to 1 AUX3 acts as
GPIO3");
/*
* ad7877_read/write are only used for initial setup and for
sysfs controls.
@@ -208,9 +211,10 @@
static int ad7877_read(struct spi_device *spi, u16 reg)
{
- struct ser_req *req = kzalloc(sizeof *req,
GFP_KERNEL);
- int status, ret;
+ struct ser_req *req;
+ int status, ret;
+ req = kzalloc(sizeof *req, GFP_KERNEL);
if (!req)
return -ENOMEM;
@@ -228,11 +232,8 @@
spi_message_add_tail(&req->xfer[1], &req->msg);
status = spi_sync(spi, &req->msg);
+ ret = status ? : req->sample;
- if (status == 0)
- status = req->msg.status;
-
- ret = status ? status : req->sample;
kfree(req);
return ret;
@@ -240,9 +241,10 @@
static int ad7877_write(struct spi_device *spi, u16 reg, u16
val)
{
- struct ser_req *req = kzalloc(sizeof *req,
GFP_KERNEL);
- int status;
+ struct ser_req *req;
+ int status;
+ req = kzalloc(sizeof *req, GFP_KERNEL);
if (!req)
return -ENOMEM;
@@ -256,9 +258,6 @@
status = spi_sync(spi, &req->msg);
- if (status == 0)
- status = req->msg.status;
-
kfree(req);
return status;
@@ -266,12 +265,13 @@
static int ad7877_read_adc(struct spi_device *spi, unsigned
command)
{
- struct ad7877 *ts =
dev_get_drvdata(&spi->dev);
- struct ser_req *req = kzalloc(sizeof *req,
GFP_KERNEL);
- int status;
- int sample;
- int i;
+ struct ad7877 *ts = dev_get_drvdata(&spi->dev);
+ struct ser_req *req;
+ int status;
+ int sample;
+ int i;
+ req = kzalloc(sizeof *req, GFP_KERNEL);
if (!req)
return -ENOMEM;
@@ -314,21 +314,18 @@
spi_message_add_tail(&req->xfer[i], &req->msg);
status = spi_sync(spi, &req->msg);
-
- if (status == 0)
- status = req->msg.status;
-
sample = req->sample;
kfree(req);
- return status ? status : sample;
+
+ return status ? : sample;
}
static void ad7877_rx(struct ad7877 *ts)
{
- struct input_dev *input_dev = ts->input;
- unsigned Rt;
- u16 x, y, z1, z2;
+ struct input_dev *input_dev = ts->input;
+ unsigned Rt;
+ u16 x, y, z1, z2;
x = ts->conversion_data[AD7877_SEQ_XPOS] & MAX_12BIT;
y = ts->conversion_data[AD7877_SEQ_YPOS] & MAX_12BIT;
@@ -350,10 +347,7 @@
Rt = (z2 - z1) * x * ts->x_plate_ohms;
Rt /= z1;
Rt = (Rt + 2047) >> 12;
- } else
- Rt = 0;
- if (Rt) {
input_report_abs(input_dev, ABS_X, x);
input_report_abs(input_dev, ABS_Y, y);
input_report_abs(input_dev, ABS_PRESSURE, Rt);
@@ -371,7 +365,7 @@
static void ad7877_timer(unsigned long handle)
{
- struct ad7877 *ts = (void *)handle;
+ struct ad7877 *ts = (void *)handle;
ad7877_ts_event_release(ts);
}
@@ -382,78 +376,72 @@
unsigned long flags;
int status;
- /* The repeated conversion sequencer controlled by TMR
kicked off too fast.
- * We ignore the last and process the sample sequence
currently in the queue
- * It can't be older than 9.4ms, and we need to avoid
that ts->msg
- * doesn't get issued twice while in work.
+ /*
+ * The repeated conversion sequencer controlled by TMR
kicked off
+ * too fast. We ignore the last and process the sample
sequence
+ * currently in the queue. It can't be older than 9.4ms,
and we
+ * need to avoid that ts->msg doesn't get issued twice
while in work.
*/
spin_lock_irqsave(&ts->lock, flags);
- if (ts->pending) {
- spin_unlock_irqrestore(&ts->lock, flags);
- return IRQ_HANDLED;
+ if (!ts->pending) {
+ ts->pending = 1;
+
+ status = spi_async(ts->spi, &ts->msg);
+ if (status)
+ dev_err(&ts->spi->dev, "spi_sync -->
%d\n", status);
}
- ts->pending = 1;
spin_unlock_irqrestore(&ts->lock, flags);
- status = spi_async(ts->spi, &ts->msg);
-
- if (status)
- dev_err(&ts->spi->dev, "spi_sync --> %d\n",
status);
-
return IRQ_HANDLED;
}
static void ad7877_callback(void *_ts)
{
struct ad7877 *ts = _ts;
- unsigned long flags;
- ad7877_rx(ts);
+ spin_lock_irq(&ts->lock);
- spin_lock_irqsave(&ts->lock, flags);
+ ad7877_rx(ts);
ts->pending = 0;
mod_timer(&ts->timer, jiffies + TS_PEN_UP_TIMEOUT);
- spin_unlock_irqrestore(&ts->lock, flags);
+
+ spin_unlock_irq(&ts->lock);
}
static void ad7877_disable(struct ad7877 *ts)
{
- unsigned long flags;
+ mutex_lock(&ts->mutex);
- spin_lock_irqsave(&ts->lock, flags);
- if (ts->disabled) {
- spin_unlock_irqrestore(&ts->lock, flags);
- return;
- }
+ if (!ts->disabled) {
+ ts->disabled = 1;
+ disable_irq(ts->spi->irq);
- ts->disabled = 1;
- disable_irq(ts->spi->irq);
- spin_unlock_irqrestore(&ts->lock, flags);
+ /* Wait for spi_async callback */
+ while (ts->pending)
+ msleep(1);
- while (ts->pending) /* Wait for spi_async callback */
- msleep(1);
+ if (del_timer_sync(&ts->timer))
+ ad7877_ts_event_release(ts);
+ }
- if (del_timer_sync(&ts->timer))
- ad7877_ts_event_release(ts);
-
/* we know the chip's in lowpower mode since we always
* leave it that way after every request
*/
+
+ mutex_unlock(&ts->mutex);
}
static void ad7877_enable(struct ad7877 *ts)
{
- unsigned long flags;
+ mutex_lock(&ts->mutex);
- spin_lock_irqsave(&ts->lock, flags);
if (ts->disabled) {
- spin_unlock_irqrestore(&ts->lock, flags);
- return;
+ ts->disabled = 0;
+ enable_irq(ts->spi->irq);
}
- ts->disabled = 0;
- enable_irq(ts->spi->irq);
- spin_unlock_irqrestore(&ts->lock, flags);
+
+ mutex_unlock(&ts->mutex);
}
#define SHOW(name) static ssize_t \
@@ -490,13 +478,12 @@
{
struct ad7877 *ts = dev_get_drvdata(dev);
unsigned long val;
- int ret;
+ int error;
- ret = strict_strtoul(buf, 10, &val);
+ error = strict_strtoul(buf, 10, &val);
+ if (error)
+ return error;
- if (ret)
- return ret;
-
if (val)
ad7877_disable(ts);
else
@@ -521,16 +508,16 @@
{
struct ad7877 *ts = dev_get_drvdata(dev);
unsigned long val;
- int ret;
+ int error;
- ret = strict_strtoul(buf, 10, &val);
+ error = strict_strtoul(buf, 10, &val);
+ if (error)
+ return error;
- if (ret)
- return ret;
-
+ mutex_lock(&ts->mutex);
ts->dac = val & 0xFF;
-
ad7877_write(ts->spi, AD7877_REG_DAC, (ts->dac << 4) |
AD7877_DAC_CONF);
+ mutex_unlock(&ts->mutex);
return count;
}
@@ -551,16 +538,17 @@
{
struct ad7877 *ts = dev_get_drvdata(dev);
unsigned long val;
- int ret;
+ int error;
- ret = strict_strtoul(buf, 10, &val);
- if (ret)
- return ret;
+ error = strict_strtoul(buf, 10, &val);
+ if (error)
+ return error;
+ mutex_lock(&ts->mutex);
ts->gpio3 = !!val;
-
ad7877_write(ts->spi, AD7877_REG_EXTWRITE,
AD7877_EXTW_GPIO_DATA |
(ts->gpio4 << 4) | (ts->gpio3 << 5));
+ mutex_unlock(&ts->mutex);
return count;
}
@@ -581,16 +569,17 @@
{
struct ad7877 *ts = dev_get_drvdata(dev);
unsigned long val;
- int ret;
+ int error;
- ret = strict_strtoul(buf, 10, &val);
- if (ret)
- return ret;
+ error = strict_strtoul(buf, 10, &val);
+ if (error)
+ return error;
+ mutex_lock(&ts->mutex);
ts->gpio4 = !!val;
-
ad7877_write(ts->spi, AD7877_REG_EXTWRITE,
AD7877_EXTW_GPIO_DATA |
- (ts->gpio4 << 4) | (ts->gpio3 << 5));
+ (ts->gpio4 << 4) | (ts->gpio3 << 5));
+ mutex_unlock(&ts->mutex);
return count;
}
@@ -685,14 +674,10 @@
}
ts = kzalloc(sizeof(struct ad7877), GFP_KERNEL);
- if (!ts)
- return -ENOMEM;
-
-
input_dev = input_allocate_device();
- if (!input_dev) {
- kfree(ts);
- return -ENOMEM;
+ if (!ts || !input_dev) {
+ err = -ENOMEM;
+ goto err_free_mem;
}
dev_set_drvdata(&spi->dev, ts);
@@ -700,6 +685,7 @@
ts->input = input_dev;
setup_timer(&ts->timer, ad7877_timer, (unsigned long)
ts);
+ mutex_init(&ts->mutex);
spin_lock_init(&ts->lock);
ts->model = pdata->model ? : 7877;
@@ -761,30 +747,25 @@
}
err = sysfs_create_group(&spi->dev.kobj,
&ad7877_attr_group);
-
- if (gpio3)
- err |= device_create_file(&spi->dev,
&dev_attr_gpio3);
- else
- err |= device_create_file(&spi->dev,
&dev_attr_aux3);
-
if (err)
goto err_free_irq;
+ err = device_create_file(&spi->dev,
+ gpio3 ? &dev_attr_gpio3 :
&dev_attr_aux3);
+ if (err)
+ goto err_remove_attr_group;
+
err = input_register_device(input_dev);
if (err)
goto err_remove_attr;
- dev_info(&spi->dev, "touchscreen, irq %d\n", spi->irq);
-
return 0;
err_remove_attr:
+ device_remove_file(&spi->dev,
+ gpio3 ? &dev_attr_gpio3 :
&dev_attr_aux3);
+err_remove_attr_group:
sysfs_remove_group(&spi->dev.kobj, &ad7877_attr_group);
-
- if (gpio3)
- device_remove_file(&spi->dev, &dev_attr_gpio3);
- else
- device_remove_file(&spi->dev, &dev_attr_aux3);
err_free_irq:
free_irq(spi->irq, ts);
err_free_mem:
@@ -798,19 +779,14 @@
{
struct ad7877 *ts =
dev_get_drvdata(&spi->dev);
- ad7877_disable(ts);
-
sysfs_remove_group(&spi->dev.kobj, &ad7877_attr_group);
+ device_remove_file(&spi->dev,
+ gpio3 ? &dev_attr_gpio3 :
&dev_attr_aux3);
- if (gpio3)
- device_remove_file(&spi->dev, &dev_attr_gpio3);
- else
- device_remove_file(&spi->dev, &dev_attr_aux3);
-
+ ad7877_disable(ts);
free_irq(ts->spi->irq, ts);
input_unregister_device(ts->input);
-
kfree(ts);
dev_dbg(&spi->dev, "unregistered touchscreen\n");
@@ -866,10 +842,6 @@
}
module_exit(ad7877_exit);
-module_param(gpio3, int, 0);
-MODULE_PARM_DESC(gpio3,
- "If gpio3 is set to 1 AUX3 acts as GPIO3");
-
MODULE_AUTHOR("Michael Hennerich
<[email protected]>");
MODULE_DESCRIPTION("AD7877 touchscreen Driver");
MODULE_LICENSE("GPL");
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