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path: root/drivers/input/touchscreen/ad7877.c
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Diffstat (limited to 'drivers/input/touchscreen/ad7877.c')
-rw-r--r--drivers/input/touchscreen/ad7877.c144
1 files changed, 81 insertions, 63 deletions
diff --git a/drivers/input/touchscreen/ad7877.c b/drivers/input/touchscreen/ad7877.c
index 5f0221cffef9..a1952fcc083e 100644
--- a/drivers/input/touchscreen/ad7877.c
+++ b/drivers/input/touchscreen/ad7877.c
@@ -191,13 +191,12 @@ struct ad7877 {
struct spi_message msg;
struct mutex mutex;
- unsigned disabled:1; /* P: mutex */
- unsigned gpio3:1; /* P: mutex */
- unsigned gpio4:1; /* P: mutex */
+ bool disabled; /* P: mutex */
+ bool gpio3; /* P: mutex */
+ bool gpio4; /* P: mutex */
spinlock_t lock;
struct timer_list timer; /* P: lock */
- unsigned pending:1; /* P: lock */
/*
* DMA (thus cache coherency maintenance) requires the
@@ -206,8 +205,8 @@ struct ad7877 {
u16 conversion_data[AD7877_NR_SENSE] ____cacheline_aligned;
};
-static int gpio3;
-module_param(gpio3, int, 0);
+static bool gpio3;
+module_param(gpio3, bool, 0);
MODULE_PARM_DESC(gpio3, "If gpio3 is set to 1 AUX3 acts as GPIO3");
/*
@@ -230,6 +229,7 @@ static int ad7877_read(struct spi_device *spi, u16 reg)
AD7877_READADD(reg));
req->xfer[0].tx_buf = &req->command;
req->xfer[0].len = 2;
+ req->xfer[0].cs_change = 1;
req->xfer[1].rx_buf = &req->sample;
req->xfer[1].len = 2;
@@ -295,20 +295,25 @@ static int ad7877_read_adc(struct spi_device *spi, unsigned command)
req->xfer[0].tx_buf = &req->reset;
req->xfer[0].len = 2;
+ req->xfer[0].cs_change = 1;
req->xfer[1].tx_buf = &req->ref_on;
req->xfer[1].len = 2;
req->xfer[1].delay_usecs = ts->vref_delay_usecs;
+ req->xfer[1].cs_change = 1;
req->xfer[2].tx_buf = &req->command;
req->xfer[2].len = 2;
req->xfer[2].delay_usecs = ts->vref_delay_usecs;
+ req->xfer[2].cs_change = 1;
req->xfer[3].rx_buf = &req->sample;
req->xfer[3].len = 2;
+ req->xfer[3].cs_change = 1;
req->xfer[4].tx_buf = &ts->cmd_crtl2; /*REF OFF*/
req->xfer[4].len = 2;
+ req->xfer[4].cs_change = 1;
req->xfer[5].tx_buf = &ts->cmd_crtl1; /*DEFAULT*/
req->xfer[5].len = 2;
@@ -327,7 +332,7 @@ static int ad7877_read_adc(struct spi_device *spi, unsigned command)
return status ? : sample;
}
-static void ad7877_rx(struct ad7877 *ts)
+static int ad7877_process_data(struct ad7877 *ts)
{
struct input_dev *input_dev = ts->input;
unsigned Rt;
@@ -354,11 +359,25 @@ static void ad7877_rx(struct ad7877 *ts)
Rt /= z1;
Rt = (Rt + 2047) >> 12;
+ /*
+ * Sample found inconsistent, pressure is beyond
+ * the maximum. Don't report it to user space.
+ */
+ if (Rt > ts->pressure_max)
+ return -EINVAL;
+
+ if (!timer_pending(&ts->timer))
+ input_report_key(input_dev, BTN_TOUCH, 1);
+
input_report_abs(input_dev, ABS_X, x);
input_report_abs(input_dev, ABS_Y, y);
input_report_abs(input_dev, ABS_PRESSURE, Rt);
input_sync(input_dev);
+
+ return 0;
}
+
+ return -EINVAL;
}
static inline void ad7877_ts_event_release(struct ad7877 *ts)
@@ -366,72 +385,56 @@ static inline void ad7877_ts_event_release(struct ad7877 *ts)
struct input_dev *input_dev = ts->input;
input_report_abs(input_dev, ABS_PRESSURE, 0);
+ input_report_key(input_dev, BTN_TOUCH, 0);
input_sync(input_dev);
}
static void ad7877_timer(unsigned long handle)
{
struct ad7877 *ts = (void *)handle;
+ unsigned long flags;
+ spin_lock_irqsave(&ts->lock, flags);
ad7877_ts_event_release(ts);
+ spin_unlock_irqrestore(&ts->lock, flags);
}
static irqreturn_t ad7877_irq(int irq, void *handle)
{
struct ad7877 *ts = handle;
unsigned long flags;
- int status;
+ int error;
- /*
- * 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.
- */
+ error = spi_sync(ts->spi, &ts->msg);
+ if (error) {
+ dev_err(&ts->spi->dev, "spi_sync --> %d\n", error);
+ goto out;
+ }
spin_lock_irqsave(&ts->lock, flags);
- 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);
- }
+ error = ad7877_process_data(ts);
+ if (!error)
+ mod_timer(&ts->timer, jiffies + TS_PEN_UP_TIMEOUT);
spin_unlock_irqrestore(&ts->lock, flags);
+out:
return IRQ_HANDLED;
}
-static void ad7877_callback(void *_ts)
-{
- struct ad7877 *ts = _ts;
-
- spin_lock_irq(&ts->lock);
-
- ad7877_rx(ts);
- ts->pending = 0;
- mod_timer(&ts->timer, jiffies + TS_PEN_UP_TIMEOUT);
-
- spin_unlock_irq(&ts->lock);
-}
-
static void ad7877_disable(struct ad7877 *ts)
{
mutex_lock(&ts->mutex);
if (!ts->disabled) {
- ts->disabled = 1;
+ ts->disabled = true;
disable_irq(ts->spi->irq);
- /* Wait for spi_async callback */
- while (ts->pending)
- msleep(1);
-
if (del_timer_sync(&ts->timer))
ad7877_ts_event_release(ts);
}
- /* we know the chip's in lowpower mode since we always
+ /*
+ * We know the chip's in lowpower mode since we always
* leave it that way after every request
*/
@@ -443,7 +446,7 @@ static void ad7877_enable(struct ad7877 *ts)
mutex_lock(&ts->mutex);
if (ts->disabled) {
- ts->disabled = 0;
+ ts->disabled = false;
enable_irq(ts->spi->irq);
}
@@ -453,7 +456,7 @@ static void ad7877_enable(struct ad7877 *ts)
#define SHOW(name) static ssize_t \
name ## _show(struct device *dev, struct device_attribute *attr, char *buf) \
{ \
- struct ad7877 *ts = dev_get_drvdata(dev); \
+ struct ad7877 *ts = dev_get_drvdata(dev); \
ssize_t v = ad7877_read_adc(ts->spi, \
AD7877_READ_CHAN(name)); \
if (v < 0) \
@@ -473,7 +476,7 @@ SHOW(temp2)
static ssize_t ad7877_disable_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
- struct ad7877 *ts = dev_get_drvdata(dev);
+ struct ad7877 *ts = dev_get_drvdata(dev);
return sprintf(buf, "%u\n", ts->disabled);
}
@@ -503,7 +506,7 @@ static DEVICE_ATTR(disable, 0664, ad7877_disable_show, ad7877_disable_store);
static ssize_t ad7877_dac_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
- struct ad7877 *ts = dev_get_drvdata(dev);
+ struct ad7877 *ts = dev_get_drvdata(dev);
return sprintf(buf, "%u\n", ts->dac);
}
@@ -533,7 +536,7 @@ static DEVICE_ATTR(dac, 0664, ad7877_dac_show, ad7877_dac_store);
static ssize_t ad7877_gpio3_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
- struct ad7877 *ts = dev_get_drvdata(dev);
+ struct ad7877 *ts = dev_get_drvdata(dev);
return sprintf(buf, "%u\n", ts->gpio3);
}
@@ -564,7 +567,7 @@ static DEVICE_ATTR(gpio3, 0664, ad7877_gpio3_show, ad7877_gpio3_store);
static ssize_t ad7877_gpio4_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
- struct ad7877 *ts = dev_get_drvdata(dev);
+ struct ad7877 *ts = dev_get_drvdata(dev);
return sprintf(buf, "%u\n", ts->gpio4);
}
@@ -597,16 +600,35 @@ static struct attribute *ad7877_attributes[] = {
&dev_attr_temp2.attr,
&dev_attr_aux1.attr,
&dev_attr_aux2.attr,
+ &dev_attr_aux3.attr,
&dev_attr_bat1.attr,
&dev_attr_bat2.attr,
&dev_attr_disable.attr,
&dev_attr_dac.attr,
+ &dev_attr_gpio3.attr,
&dev_attr_gpio4.attr,
NULL
};
+static mode_t ad7877_attr_is_visible(struct kobject *kobj,
+ struct attribute *attr, int n)
+{
+ mode_t mode = attr->mode;
+
+ if (attr == &dev_attr_aux3.attr) {
+ if (gpio3)
+ mode = 0;
+ } else if (attr == &dev_attr_gpio3.attr) {
+ if (!gpio3)
+ mode = 0;
+ }
+
+ return mode;
+}
+
static const struct attribute_group ad7877_attr_group = {
- .attrs = ad7877_attributes,
+ .is_visible = ad7877_attr_is_visible,
+ .attrs = ad7877_attributes,
};
static void ad7877_setup_ts_def_msg(struct spi_device *spi, struct ad7877 *ts)
@@ -635,22 +657,25 @@ static void ad7877_setup_ts_def_msg(struct spi_device *spi, struct ad7877 *ts)
spi_message_init(m);
- m->complete = ad7877_callback;
m->context = ts;
ts->xfer[0].tx_buf = &ts->cmd_crtl1;
ts->xfer[0].len = 2;
+ ts->xfer[0].cs_change = 1;
spi_message_add_tail(&ts->xfer[0], m);
ts->xfer[1].tx_buf = &ts->cmd_dummy; /* Send ZERO */
ts->xfer[1].len = 2;
+ ts->xfer[1].cs_change = 1;
spi_message_add_tail(&ts->xfer[1], m);
- for (i = 0; i < 11; i++) {
+ for (i = 0; i < AD7877_NR_SENSE; i++) {
ts->xfer[i + 2].rx_buf = &ts->conversion_data[AD7877_SEQ_YPOS + i];
ts->xfer[i + 2].len = 2;
+ if (i < (AD7877_NR_SENSE - 1))
+ ts->xfer[i + 2].cs_change = 1;
spi_message_add_tail(&ts->xfer[i + 2], m);
}
}
@@ -718,6 +743,8 @@ static int __devinit ad7877_probe(struct spi_device *spi)
input_dev->phys = ts->phys;
input_dev->dev.parent = &spi->dev;
+ __set_bit(EV_KEY, input_dev->evbit);
+ __set_bit(BTN_TOUCH, input_dev->keybit);
__set_bit(EV_ABS, input_dev->evbit);
__set_bit(ABS_X, input_dev->absbit);
__set_bit(ABS_Y, input_dev->absbit);
@@ -752,8 +779,9 @@ static int __devinit ad7877_probe(struct spi_device *spi)
/* Request AD7877 /DAV GPIO interrupt */
- err = request_irq(spi->irq, ad7877_irq, IRQF_TRIGGER_FALLING,
- spi->dev.driver->name, ts);
+ err = request_threaded_irq(spi->irq, NULL, ad7877_irq,
+ IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
+ spi->dev.driver->name, ts);
if (err) {
dev_dbg(&spi->dev, "irq %d busy?\n", spi->irq);
goto err_free_mem;
@@ -763,20 +791,12 @@ static int __devinit ad7877_probe(struct spi_device *spi)
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;
+ goto err_remove_attr_group;
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);
err_free_irq:
@@ -790,11 +810,9 @@ err_free_mem:
static int __devexit ad7877_remove(struct spi_device *spi)
{
- struct ad7877 *ts = dev_get_drvdata(&spi->dev);
+ struct ad7877 *ts = dev_get_drvdata(&spi->dev);
sysfs_remove_group(&spi->dev.kobj, &ad7877_attr_group);
- device_remove_file(&spi->dev,
- gpio3 ? &dev_attr_gpio3 : &dev_attr_aux3);
ad7877_disable(ts);
free_irq(ts->spi->irq, ts);
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.