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Message-ID: <20150601174730.GA30024@dtor-ws>
Date: Mon, 1 Jun 2015 10:47:30 -0700
From: Dmitry Torokhov <dmitry.torokhov@...il.com>
To: Pavel Machek <pavel@....cz>
Cc: Maxime Ripard <maxime.ripard@...e-electrons.com>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Felipe Balbi <balbi@...com>,
Sebastian Reichel <sre@...nel.org>,
kernel list <linux-kernel@...r.kernel.org>,
pali.rohar@...il.com, sre@...ian.org, sre@...g0.de,
linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
linux-omap@...r.kernel.org, tony@...mide.com, khilman@...nel.org,
aaro.koskinen@....fi, ivo.g.dimitrov.75@...il.com,
patrikbachan@...il.com
Subject: Re: Please revert 3eea8b5d68c801fec788b411582b803463834752 as it
breaks touchscreen on n900.
On Mon, Jun 01, 2015 at 05:21:11PM +0200, Pavel Machek wrote:
>
>
> > > > > The 3eea8b5d68c801fec788b411582b803463834752 is just bad.
> > > >
> > > > You were very welcome to review this patch at the time and/or suggest
> > > > a fix that pleases everyone.
> > >
> > > You should be the one that should suggest fixes, as you broke it in
> > > the first place. But clearly you don't understand that.
> >
> > You actually never asked for a fix, and went head first calling this
> > patch "bad" and asking for nothing but reverting it.
>
> Date: Fri, 29 May 2015 21:08:16 +0200
> Subject: 4.1 touchscreen regression on n900 -- pinpointed [was Re:
> linux-n900
> ...
> Maxime, can you suggest a fix?
How about we do something like below (it needs a small edt-ft5x06 fixup
that I'll send separately). Not tested.
Thanks.
--
Dmitry
Input: improve parsing OF parameters for touchscreens
From: Dmitry Torokhov <dmitry.torokhov@...il.com>
When applying touchscreen parameters specified in device tree let's make
sure we keep whatever setup was done by the driver and not reset the
missing values to zero.
Reported-by: Pavel Machek <pavel@....cz>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
---
drivers/input/touchscreen/edt-ft5x06.c | 2 -
drivers/input/touchscreen/of_touchscreen.c | 67 ++++++++++++++++++----------
drivers/input/touchscreen/tsc2005.c | 2 -
include/linux/input/touchscreen.h | 5 +-
4 files changed, 48 insertions(+), 28 deletions(-)
diff --git a/drivers/input/touchscreen/edt-ft5x06.c b/drivers/input/touchscreen/edt-ft5x06.c
index 29d179a..394b1de 100644
--- a/drivers/input/touchscreen/edt-ft5x06.c
+++ b/drivers/input/touchscreen/edt-ft5x06.c
@@ -1041,7 +1041,7 @@ static int edt_ft5x06_ts_probe(struct i2c_client *client,
0, tsdata->num_y * 64 - 1, 0, 0);
if (!pdata)
- touchscreen_parse_of_params(input);
+ touchscreen_parse_of_params(input, true);
error = input_mt_init_slots(input, MAX_SUPPORT_POINTS, INPUT_MT_DIRECT);
if (error) {
diff --git a/drivers/input/touchscreen/of_touchscreen.c b/drivers/input/touchscreen/of_touchscreen.c
index b82b520..c132624 100644
--- a/drivers/input/touchscreen/of_touchscreen.c
+++ b/drivers/input/touchscreen/of_touchscreen.c
@@ -14,14 +14,22 @@
#include <linux/input/mt.h>
#include <linux/input/touchscreen.h>
-static u32 of_get_optional_u32(struct device_node *np,
- const char *property)
+static bool touchscreen_get_property_u32(struct device_node *np,
+ const char *property,
+ unsigned int default_value,
+ unsigned int *value)
{
u32 val = 0;
+ int error;
- of_property_read_u32(np, property, &val);
+ error = of_property_read_u32(np, property, &val);
+ if (error) {
+ *value = default_value;
+ return false;
+ }
- return val;
+ *value = val;
+ return true;
}
static void touchscreen_set_params(struct input_dev *dev,
@@ -54,34 +62,45 @@ static void touchscreen_set_params(struct input_dev *dev,
* input device accordingly. The function keeps previously setuped default
* values if no value is specified via DT.
*/
-void touchscreen_parse_of_params(struct input_dev *dev)
+void touchscreen_parse_of_params(struct input_dev *dev, bool multitouch)
{
struct device_node *np = dev->dev.parent->of_node;
- u32 maximum, fuzz;
+ unsigned int maximum, fuzz;
+ int axis;
+ bool present;
input_alloc_absinfo(dev);
if (!dev->absinfo)
return;
- maximum = of_get_optional_u32(np, "touchscreen-size-x");
- fuzz = of_get_optional_u32(np, "touchscreen-fuzz-x");
- if (maximum || fuzz) {
- touchscreen_set_params(dev, ABS_X, maximum, fuzz);
- touchscreen_set_params(dev, ABS_MT_POSITION_X, maximum, fuzz);
- }
+ axis = multitouch ? ABS_MT_POSITION_X : ABS_X;
+ data_present = touchscreen_get_prop_u32(np, "touchscreen-size-x",
+ input_abs_get_maximum(axis),
+ &maximum) |
+ touchscreen_get_prop_u32(np, "touchscreen-fuzz-x",
+ input_abs_get_fuzz(axis),
+ &fuzz);
+ if (data_present)
+ touchscreen_set_params(dev, axis, maximum, fuzz);
- maximum = of_get_optional_u32(np, "touchscreen-size-y");
- fuzz = of_get_optional_u32(np, "touchscreen-fuzz-y");
- if (maximum || fuzz) {
- touchscreen_set_params(dev, ABS_Y, maximum, fuzz);
- touchscreen_set_params(dev, ABS_MT_POSITION_Y, maximum, fuzz);
- }
+ axis = multitouch ? ABS_MT_POSITION_Y : ABS_Y;
+ data_present = touchscreen_get_prop_u32(np, "touchscreen-size-y",
+ input_abs_get_maximum(axis),
+ &maximum) |
+ touchscreen_get_prop_u32(np, "touchscreen-fuzz-y",
+ input_abs_get_fuzz(axis),
+ &fuzz);
+ if (data_present)
+ touchscreen_set_params(dev, axis, maximum, fuzz);
- maximum = of_get_optional_u32(np, "touchscreen-max-pressure");
- fuzz = of_get_optional_u32(np, "touchscreen-fuzz-pressure");
- if (maximum || fuzz) {
- touchscreen_set_params(dev, ABS_PRESSURE, maximum, fuzz);
- touchscreen_set_params(dev, ABS_MT_PRESSURE, maximum, fuzz);
- }
+ axis = multitouch ? ABS_MT_PRESSURE : ABS_PRESSURE;
+ data_present = touchscreen_get_prop_u32(np, "touchscreen-max-pressure",
+ input_abs_get_maximum(axis),
+ &maximum) |
+ touchscreen_get_prop_u32(np, "touchscreen-fuzz-pressure",
+ input_abs_get_fuzz(axis),
+ &fuzz);
+ if (data_present)
+ touchscreen_set_params(dev, axis, maximum, fuzz);
}
EXPORT_SYMBOL(touchscreen_parse_of_params);
diff --git a/drivers/input/touchscreen/tsc2005.c b/drivers/input/touchscreen/tsc2005.c
index 72657c5..d8c025b 100644
--- a/drivers/input/touchscreen/tsc2005.c
+++ b/drivers/input/touchscreen/tsc2005.c
@@ -709,7 +709,7 @@ static int tsc2005_probe(struct spi_device *spi)
input_set_abs_params(input_dev, ABS_PRESSURE, 0, max_p, fudge_p, 0);
if (np)
- touchscreen_parse_of_params(input_dev);
+ touchscreen_parse_of_params(input_dev, false);
input_dev->open = tsc2005_open;
input_dev->close = tsc2005_close;
diff --git a/include/linux/input/touchscreen.h b/include/linux/input/touchscreen.h
index 08a5ef6..eecc9ea 100644
--- a/include/linux/input/touchscreen.h
+++ b/include/linux/input/touchscreen.h
@@ -12,9 +12,10 @@
#include <linux/input.h>
#ifdef CONFIG_OF
-void touchscreen_parse_of_params(struct input_dev *dev);
+void touchscreen_parse_of_params(struct input_dev *dev, bool multitouch);
#else
-static inline void touchscreen_parse_of_params(struct input_dev *dev)
+static inline void touchscreen_parse_of_params(struct input_dev *dev,
+ bool multitouch)
{
}
#endif
--
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