2009-05-19 01:10:39 +02:00
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|
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/*
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|
|
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* Touch Screen driver for EETI's I2C connected touch screen panels
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* Copyright (c) 2009 Daniel Mack <daniel@caiaq.de>
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*
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* See EETI's software guide for the protocol specification:
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* http://home.eeti.com.tw/web20/eg/guide.htm
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*
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* Based on migor_ts.c
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* Copyright (c) 2008 Magnus Damm
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* Copyright (c) 2007 Ujjwal Pande <ujjwal@kenati.com>
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*
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* This file is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This file is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/kernel.h>
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#include <linux/input.h>
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#include <linux/interrupt.h>
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#include <linux/i2c.h>
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#include <linux/timer.h>
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#include <linux/gpio.h>
|
2009-08-12 09:50:09 +02:00
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#include <linux/input/eeti_ts.h>
|
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files. percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.
percpu.h -> slab.h dependency is about to be removed. Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability. As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.
http://userweb.kernel.org/~tj/misc/slabh-sweep.py
The script does the followings.
* Scan files for gfp and slab usages and update includes such that
only the necessary includes are there. ie. if only gfp is used,
gfp.h, if slab is used, slab.h.
* When the script inserts a new include, it looks at the include
blocks and try to put the new include such that its order conforms
to its surrounding. It's put in the include block which contains
core kernel includes, in the same order that the rest are ordered -
alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
doesn't seem to be any matching order.
* If the script can't find a place to put a new include (mostly
because the file doesn't have fitting include block), it prints out
an error message indicating which .h file needs to be added to the
file.
The conversion was done in the following steps.
1. The initial automatic conversion of all .c files updated slightly
over 4000 files, deleting around 700 includes and adding ~480 gfp.h
and ~3000 slab.h inclusions. The script emitted errors for ~400
files.
2. Each error was manually checked. Some didn't need the inclusion,
some needed manual addition while adding it to implementation .h or
embedding .c file was more appropriate for others. This step added
inclusions to around 150 files.
3. The script was run again and the output was compared to the edits
from #2 to make sure no file was left behind.
4. Several build tests were done and a couple of problems were fixed.
e.g. lib/decompress_*.c used malloc/free() wrappers around slab
APIs requiring slab.h to be added manually.
5. The script was run on all .h files but without automatically
editing them as sprinkling gfp.h and slab.h inclusions around .h
files could easily lead to inclusion dependency hell. Most gfp.h
inclusion directives were ignored as stuff from gfp.h was usually
wildly available and often used in preprocessor macros. Each
slab.h inclusion directive was examined and added manually as
necessary.
6. percpu.h was updated not to include slab.h.
7. Build test were done on the following configurations and failures
were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my
distributed build env didn't work with gcov compiles) and a few
more options had to be turned off depending on archs to make things
build (like ipr on powerpc/64 which failed due to missing writeq).
* x86 and x86_64 UP and SMP allmodconfig and a custom test config.
* powerpc and powerpc64 SMP allmodconfig
* sparc and sparc64 SMP allmodconfig
* ia64 SMP allmodconfig
* s390 SMP allmodconfig
* alpha SMP allmodconfig
* um on x86_64 SMP allmodconfig
8. percpu.h modifications were reverted so that it could be applied as
a separate patch and serve as bisection point.
Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.
Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 09:04:11 +01:00
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|
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#include <linux/slab.h>
|
2009-05-19 01:10:39 +02:00
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|
2012-01-13 00:02:20 +01:00
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static bool flip_x;
|
2009-05-19 01:10:39 +02:00
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module_param(flip_x, bool, 0644);
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|
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MODULE_PARM_DESC(flip_x, "flip x coordinate");
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|
2012-01-13 00:02:20 +01:00
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|
static bool flip_y;
|
2009-05-19 01:10:39 +02:00
|
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|
module_param(flip_y, bool, 0644);
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|
|
MODULE_PARM_DESC(flip_y, "flip y coordinate");
|
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struct eeti_ts_priv {
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|
|
struct i2c_client *client;
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|
|
struct input_dev *input;
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|
|
struct work_struct work;
|
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|
|
struct mutex mutex;
|
2012-04-30 18:21:37 +02:00
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|
|
int irq_gpio, irq, irq_active_high;
|
2009-05-19 01:10:39 +02:00
|
|
|
};
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#define EETI_TS_BITDEPTH (11)
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#define EETI_MAXVAL ((1 << (EETI_TS_BITDEPTH + 1)) - 1)
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#define REPORT_BIT_PRESSED (1 << 0)
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#define REPORT_BIT_AD0 (1 << 1)
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#define REPORT_BIT_AD1 (1 << 2)
|
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|
|
#define REPORT_BIT_HAS_PRESSURE (1 << 6)
|
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|
|
#define REPORT_RES_BITS(v) (((v) >> 1) + EETI_TS_BITDEPTH)
|
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|
|
2009-08-12 09:50:09 +02:00
|
|
|
static inline int eeti_ts_irq_active(struct eeti_ts_priv *priv)
|
|
|
|
{
|
2012-04-30 18:21:37 +02:00
|
|
|
return gpio_get_value(priv->irq_gpio) == priv->irq_active_high;
|
2009-08-12 09:50:09 +02:00
|
|
|
}
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|
2009-05-19 01:10:39 +02:00
|
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|
static void eeti_ts_read(struct work_struct *work)
|
|
|
|
{
|
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|
|
char buf[6];
|
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|
|
unsigned int x, y, res, pressed, to = 100;
|
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|
|
struct eeti_ts_priv *priv =
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|
|
container_of(work, struct eeti_ts_priv, work);
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mutex_lock(&priv->mutex);
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|
2009-08-12 09:50:09 +02:00
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|
while (eeti_ts_irq_active(priv) && --to)
|
2009-05-19 01:10:39 +02:00
|
|
|
i2c_master_recv(priv->client, buf, sizeof(buf));
|
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|
|
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|
|
if (!to) {
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|
|
|
dev_err(&priv->client->dev,
|
|
|
|
"unable to clear IRQ - line stuck?\n");
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
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|
|
/* drop non-report packets */
|
|
|
|
if (!(buf[0] & 0x80))
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|
|
goto out;
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|
|
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|
pressed = buf[0] & REPORT_BIT_PRESSED;
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|
|
res = REPORT_RES_BITS(buf[0] & (REPORT_BIT_AD0 | REPORT_BIT_AD1));
|
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|
|
x = buf[2] | (buf[1] << 8);
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|
|
y = buf[4] | (buf[3] << 8);
|
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|
|
/* fix the range to 11 bits */
|
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|
x >>= res - EETI_TS_BITDEPTH;
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|
|
y >>= res - EETI_TS_BITDEPTH;
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if (flip_x)
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x = EETI_MAXVAL - x;
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if (flip_y)
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y = EETI_MAXVAL - y;
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|
if (buf[0] & REPORT_BIT_HAS_PRESSURE)
|
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|
|
input_report_abs(priv->input, ABS_PRESSURE, buf[5]);
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|
|
input_report_abs(priv->input, ABS_X, x);
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|
|
|
input_report_abs(priv->input, ABS_Y, y);
|
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|
|
input_report_key(priv->input, BTN_TOUCH, !!pressed);
|
|
|
|
input_sync(priv->input);
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out:
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|
|
|
mutex_unlock(&priv->mutex);
|
|
|
|
}
|
|
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|
|
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|
|
static irqreturn_t eeti_ts_isr(int irq, void *dev_id)
|
|
|
|
{
|
|
|
|
struct eeti_ts_priv *priv = dev_id;
|
|
|
|
|
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|
|
/* postpone I2C transactions as we are atomic */
|
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|
|
schedule_work(&priv->work);
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|
return IRQ_HANDLED;
|
|
|
|
}
|
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|
|
2010-04-19 09:42:16 +02:00
|
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|
static void eeti_ts_start(struct eeti_ts_priv *priv)
|
2009-05-19 01:10:39 +02:00
|
|
|
{
|
|
|
|
enable_irq(priv->irq);
|
|
|
|
|
|
|
|
/* Read the events once to arm the IRQ */
|
|
|
|
eeti_ts_read(&priv->work);
|
2010-04-19 09:42:16 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
static void eeti_ts_stop(struct eeti_ts_priv *priv)
|
|
|
|
{
|
|
|
|
disable_irq(priv->irq);
|
|
|
|
cancel_work_sync(&priv->work);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int eeti_ts_open(struct input_dev *dev)
|
|
|
|
{
|
|
|
|
struct eeti_ts_priv *priv = input_get_drvdata(dev);
|
|
|
|
|
|
|
|
eeti_ts_start(priv);
|
2009-05-19 01:10:39 +02:00
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void eeti_ts_close(struct input_dev *dev)
|
|
|
|
{
|
|
|
|
struct eeti_ts_priv *priv = input_get_drvdata(dev);
|
|
|
|
|
2010-04-19 09:42:16 +02:00
|
|
|
eeti_ts_stop(priv);
|
2009-05-19 01:10:39 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
static int __devinit eeti_ts_probe(struct i2c_client *client,
|
|
|
|
const struct i2c_device_id *idp)
|
|
|
|
{
|
2012-04-30 18:21:37 +02:00
|
|
|
struct eeti_ts_platform_data *pdata = client->dev.platform_data;
|
2009-05-19 01:10:39 +02:00
|
|
|
struct eeti_ts_priv *priv;
|
|
|
|
struct input_dev *input;
|
2009-08-12 09:50:09 +02:00
|
|
|
unsigned int irq_flags;
|
2009-05-19 01:10:39 +02:00
|
|
|
int err = -ENOMEM;
|
|
|
|
|
2010-04-19 09:42:16 +02:00
|
|
|
/*
|
|
|
|
* In contrast to what's described in the datasheet, there seems
|
2009-05-19 01:10:39 +02:00
|
|
|
* to be no way of probing the presence of that device using I2C
|
|
|
|
* commands. So we need to blindly believe it is there, and wait
|
2010-04-19 09:42:16 +02:00
|
|
|
* for interrupts to occur.
|
|
|
|
*/
|
2009-05-19 01:10:39 +02:00
|
|
|
|
|
|
|
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
|
|
|
|
if (!priv) {
|
|
|
|
dev_err(&client->dev, "failed to allocate driver data\n");
|
|
|
|
goto err0;
|
|
|
|
}
|
|
|
|
|
|
|
|
mutex_init(&priv->mutex);
|
|
|
|
input = input_allocate_device();
|
|
|
|
|
|
|
|
if (!input) {
|
|
|
|
dev_err(&client->dev, "Failed to allocate input device.\n");
|
|
|
|
goto err1;
|
|
|
|
}
|
|
|
|
|
|
|
|
input->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
|
|
|
|
input->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
|
|
|
|
|
|
|
|
input_set_abs_params(input, ABS_X, 0, EETI_MAXVAL, 0, 0);
|
|
|
|
input_set_abs_params(input, ABS_Y, 0, EETI_MAXVAL, 0, 0);
|
|
|
|
input_set_abs_params(input, ABS_PRESSURE, 0, 0xff, 0, 0);
|
|
|
|
|
|
|
|
input->name = client->name;
|
|
|
|
input->id.bustype = BUS_I2C;
|
|
|
|
input->dev.parent = &client->dev;
|
|
|
|
input->open = eeti_ts_open;
|
|
|
|
input->close = eeti_ts_close;
|
|
|
|
|
|
|
|
priv->client = client;
|
|
|
|
priv->input = input;
|
2012-04-30 18:21:37 +02:00
|
|
|
priv->irq_gpio = pdata->irq_gpio;
|
|
|
|
priv->irq = gpio_to_irq(pdata->irq_gpio);
|
2009-05-19 01:10:39 +02:00
|
|
|
|
2012-04-30 18:21:37 +02:00
|
|
|
err = gpio_request_one(pdata->irq_gpio, GPIOF_IN, client->name);
|
|
|
|
if (err < 0)
|
|
|
|
goto err1;
|
2009-08-12 09:50:09 +02:00
|
|
|
|
|
|
|
if (pdata)
|
|
|
|
priv->irq_active_high = pdata->irq_active_high;
|
|
|
|
|
|
|
|
irq_flags = priv->irq_active_high ?
|
|
|
|
IRQF_TRIGGER_RISING : IRQF_TRIGGER_FALLING;
|
|
|
|
|
2009-05-19 01:10:39 +02:00
|
|
|
INIT_WORK(&priv->work, eeti_ts_read);
|
|
|
|
i2c_set_clientdata(client, priv);
|
|
|
|
input_set_drvdata(input, priv);
|
|
|
|
|
|
|
|
err = input_register_device(input);
|
|
|
|
if (err)
|
2012-04-30 18:21:37 +02:00
|
|
|
goto err2;
|
2009-05-19 01:10:39 +02:00
|
|
|
|
2009-08-12 09:50:09 +02:00
|
|
|
err = request_irq(priv->irq, eeti_ts_isr, irq_flags,
|
2009-05-19 01:10:39 +02:00
|
|
|
client->name, priv);
|
|
|
|
if (err) {
|
|
|
|
dev_err(&client->dev, "Unable to request touchscreen IRQ.\n");
|
2012-04-30 18:21:37 +02:00
|
|
|
goto err3;
|
2009-05-19 01:10:39 +02:00
|
|
|
}
|
|
|
|
|
2010-04-19 09:42:16 +02:00
|
|
|
/*
|
|
|
|
* Disable the device for now. It will be enabled once the
|
|
|
|
* input device is opened.
|
|
|
|
*/
|
|
|
|
eeti_ts_stop(priv);
|
2009-05-19 01:10:39 +02:00
|
|
|
|
|
|
|
device_init_wakeup(&client->dev, 0);
|
|
|
|
return 0;
|
|
|
|
|
2012-04-30 18:21:37 +02:00
|
|
|
err3:
|
2009-05-19 01:10:39 +02:00
|
|
|
input_unregister_device(input);
|
|
|
|
input = NULL; /* so we dont try to free it below */
|
2012-04-30 18:21:37 +02:00
|
|
|
err2:
|
|
|
|
gpio_free(pdata->irq_gpio);
|
2009-05-19 01:10:39 +02:00
|
|
|
err1:
|
|
|
|
input_free_device(input);
|
|
|
|
kfree(priv);
|
|
|
|
err0:
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int __devexit eeti_ts_remove(struct i2c_client *client)
|
|
|
|
{
|
|
|
|
struct eeti_ts_priv *priv = i2c_get_clientdata(client);
|
|
|
|
|
|
|
|
free_irq(priv->irq, priv);
|
2010-04-19 09:42:16 +02:00
|
|
|
/*
|
|
|
|
* eeti_ts_stop() leaves IRQ disabled. We need to re-enable it
|
|
|
|
* so that device still works if we reload the driver.
|
|
|
|
*/
|
|
|
|
enable_irq(priv->irq);
|
|
|
|
|
2009-05-19 01:10:39 +02:00
|
|
|
input_unregister_device(priv->input);
|
|
|
|
kfree(priv);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
#ifdef CONFIG_PM
|
2011-01-07 08:01:02 +01:00
|
|
|
static int eeti_ts_suspend(struct device *dev)
|
2009-05-19 01:10:39 +02:00
|
|
|
{
|
2011-01-07 08:01:02 +01:00
|
|
|
struct i2c_client *client = to_i2c_client(dev);
|
2009-05-19 01:10:39 +02:00
|
|
|
struct eeti_ts_priv *priv = i2c_get_clientdata(client);
|
2010-04-19 09:42:16 +02:00
|
|
|
struct input_dev *input_dev = priv->input;
|
|
|
|
|
|
|
|
mutex_lock(&input_dev->mutex);
|
|
|
|
|
|
|
|
if (input_dev->users)
|
|
|
|
eeti_ts_stop(priv);
|
|
|
|
|
|
|
|
mutex_unlock(&input_dev->mutex);
|
2009-05-19 01:10:39 +02:00
|
|
|
|
|
|
|
if (device_may_wakeup(&client->dev))
|
|
|
|
enable_irq_wake(priv->irq);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2011-01-07 08:01:02 +01:00
|
|
|
static int eeti_ts_resume(struct device *dev)
|
2009-05-19 01:10:39 +02:00
|
|
|
{
|
2011-01-07 08:01:02 +01:00
|
|
|
struct i2c_client *client = to_i2c_client(dev);
|
2009-05-19 01:10:39 +02:00
|
|
|
struct eeti_ts_priv *priv = i2c_get_clientdata(client);
|
2010-04-19 09:42:16 +02:00
|
|
|
struct input_dev *input_dev = priv->input;
|
2009-05-19 01:10:39 +02:00
|
|
|
|
|
|
|
if (device_may_wakeup(&client->dev))
|
|
|
|
disable_irq_wake(priv->irq);
|
|
|
|
|
2010-04-19 09:42:16 +02:00
|
|
|
mutex_lock(&input_dev->mutex);
|
|
|
|
|
|
|
|
if (input_dev->users)
|
|
|
|
eeti_ts_start(priv);
|
|
|
|
|
|
|
|
mutex_unlock(&input_dev->mutex);
|
|
|
|
|
2009-05-19 01:10:39 +02:00
|
|
|
return 0;
|
|
|
|
}
|
2011-01-07 08:01:02 +01:00
|
|
|
|
|
|
|
static SIMPLE_DEV_PM_OPS(eeti_ts_pm, eeti_ts_suspend, eeti_ts_resume);
|
2009-05-19 01:10:39 +02:00
|
|
|
#endif
|
|
|
|
|
|
|
|
static const struct i2c_device_id eeti_ts_id[] = {
|
|
|
|
{ "eeti_ts", 0 },
|
|
|
|
{ }
|
|
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(i2c, eeti_ts_id);
|
|
|
|
|
|
|
|
static struct i2c_driver eeti_ts_driver = {
|
|
|
|
.driver = {
|
|
|
|
.name = "eeti_ts",
|
2011-01-07 08:01:02 +01:00
|
|
|
#ifdef CONFIG_PM
|
|
|
|
.pm = &eeti_ts_pm,
|
|
|
|
#endif
|
2009-05-19 01:10:39 +02:00
|
|
|
},
|
|
|
|
.probe = eeti_ts_probe,
|
|
|
|
.remove = __devexit_p(eeti_ts_remove),
|
|
|
|
.id_table = eeti_ts_id,
|
|
|
|
};
|
|
|
|
|
2012-03-17 07:05:41 +01:00
|
|
|
module_i2c_driver(eeti_ts_driver);
|
2009-05-19 01:10:39 +02:00
|
|
|
|
|
|
|
MODULE_DESCRIPTION("EETI Touchscreen driver");
|
|
|
|
MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
|
|
|
|
MODULE_LICENSE("GPL");
|