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fbae3fb154
I2C drivers can use the clientdata-pointer to point to private data. As I2C
devices are not really unregistered, but merely detached from their driver, it
used to be the drivers obligation to clear this pointer during remove() or a
failed probe(). As a couple of drivers forgot to do this, it was agreed that it
was cleaner if the i2c-core does this clearance when appropriate, as there is
no guarantee for the lifetime of the clientdata-pointer after remove() anyhow.
This feature was added to the core with commit
e4a7b9b04d
to fix the faulty drivers.
As there is no need anymore to clear the clientdata-pointer, remove all current
occurrences in the drivers to simplify the code and prevent confusion.
Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Acked-by: Richard Purdie <rpurdie@linux.intel.com>
Acked-by: Dmitry Torokhov <dtor@mail.ru>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
338 lines
7.8 KiB
C
338 lines
7.8 KiB
C
/*
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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>
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#include <linux/input/eeti_ts.h>
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#include <linux/slab.h>
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static int flip_x;
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module_param(flip_x, bool, 0644);
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MODULE_PARM_DESC(flip_x, "flip x coordinate");
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static int flip_y;
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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;
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int irq, irq_active_high;
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};
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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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static inline int eeti_ts_irq_active(struct eeti_ts_priv *priv)
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{
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return gpio_get_value(irq_to_gpio(priv->irq)) == priv->irq_active_high;
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}
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static void eeti_ts_read(struct work_struct *work)
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{
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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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while (eeti_ts_irq_active(priv) && --to)
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i2c_master_recv(priv->client, buf, sizeof(buf));
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if (!to) {
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dev_err(&priv->client->dev,
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"unable to clear IRQ - line stuck?\n");
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goto out;
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}
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/* drop non-report packets */
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if (!(buf[0] & 0x80))
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goto out;
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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);
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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)
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{
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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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}
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static void eeti_ts_start(struct eeti_ts_priv *priv)
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{
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enable_irq(priv->irq);
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/* Read the events once to arm the IRQ */
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eeti_ts_read(&priv->work);
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}
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static void eeti_ts_stop(struct eeti_ts_priv *priv)
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{
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disable_irq(priv->irq);
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cancel_work_sync(&priv->work);
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}
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static int eeti_ts_open(struct input_dev *dev)
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{
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struct eeti_ts_priv *priv = input_get_drvdata(dev);
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eeti_ts_start(priv);
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return 0;
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}
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static void eeti_ts_close(struct input_dev *dev)
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{
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struct eeti_ts_priv *priv = input_get_drvdata(dev);
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eeti_ts_stop(priv);
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}
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static int __devinit eeti_ts_probe(struct i2c_client *client,
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const struct i2c_device_id *idp)
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{
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struct eeti_ts_platform_data *pdata;
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struct eeti_ts_priv *priv;
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struct input_dev *input;
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unsigned int irq_flags;
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int err = -ENOMEM;
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/*
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* In contrast to what's described in the datasheet, there seems
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* to be no way of probing the presence of that device using I2C
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* commands. So we need to blindly believe it is there, and wait
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* for interrupts to occur.
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*/
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priv = kzalloc(sizeof(*priv), GFP_KERNEL);
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if (!priv) {
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dev_err(&client->dev, "failed to allocate driver data\n");
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goto err0;
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}
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mutex_init(&priv->mutex);
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input = input_allocate_device();
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if (!input) {
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dev_err(&client->dev, "Failed to allocate input device.\n");
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goto err1;
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}
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input->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
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input->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
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input_set_abs_params(input, ABS_X, 0, EETI_MAXVAL, 0, 0);
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input_set_abs_params(input, ABS_Y, 0, EETI_MAXVAL, 0, 0);
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input_set_abs_params(input, ABS_PRESSURE, 0, 0xff, 0, 0);
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input->name = client->name;
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input->id.bustype = BUS_I2C;
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input->dev.parent = &client->dev;
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input->open = eeti_ts_open;
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input->close = eeti_ts_close;
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priv->client = client;
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priv->input = input;
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priv->irq = client->irq;
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pdata = client->dev.platform_data;
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if (pdata)
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priv->irq_active_high = pdata->irq_active_high;
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irq_flags = priv->irq_active_high ?
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IRQF_TRIGGER_RISING : IRQF_TRIGGER_FALLING;
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INIT_WORK(&priv->work, eeti_ts_read);
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i2c_set_clientdata(client, priv);
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input_set_drvdata(input, priv);
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err = input_register_device(input);
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if (err)
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goto err1;
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err = request_irq(priv->irq, eeti_ts_isr, irq_flags,
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client->name, priv);
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if (err) {
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dev_err(&client->dev, "Unable to request touchscreen IRQ.\n");
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goto err2;
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}
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/*
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* Disable the device for now. It will be enabled once the
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* input device is opened.
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*/
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eeti_ts_stop(priv);
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device_init_wakeup(&client->dev, 0);
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return 0;
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err2:
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input_unregister_device(input);
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input = NULL; /* so we dont try to free it below */
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err1:
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input_free_device(input);
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kfree(priv);
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err0:
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return err;
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}
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static int __devexit eeti_ts_remove(struct i2c_client *client)
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{
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struct eeti_ts_priv *priv = i2c_get_clientdata(client);
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free_irq(priv->irq, priv);
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/*
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* eeti_ts_stop() leaves IRQ disabled. We need to re-enable it
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* so that device still works if we reload the driver.
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*/
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enable_irq(priv->irq);
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input_unregister_device(priv->input);
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kfree(priv);
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return 0;
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}
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#ifdef CONFIG_PM
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static int eeti_ts_suspend(struct i2c_client *client, pm_message_t mesg)
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{
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struct eeti_ts_priv *priv = i2c_get_clientdata(client);
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struct input_dev *input_dev = priv->input;
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mutex_lock(&input_dev->mutex);
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if (input_dev->users)
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eeti_ts_stop(priv);
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mutex_unlock(&input_dev->mutex);
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if (device_may_wakeup(&client->dev))
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enable_irq_wake(priv->irq);
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return 0;
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}
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static int eeti_ts_resume(struct i2c_client *client)
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{
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struct eeti_ts_priv *priv = i2c_get_clientdata(client);
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struct input_dev *input_dev = priv->input;
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if (device_may_wakeup(&client->dev))
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disable_irq_wake(priv->irq);
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mutex_lock(&input_dev->mutex);
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if (input_dev->users)
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eeti_ts_start(priv);
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mutex_unlock(&input_dev->mutex);
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return 0;
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}
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#else
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#define eeti_ts_suspend NULL
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#define eeti_ts_resume NULL
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#endif
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static const struct i2c_device_id eeti_ts_id[] = {
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{ "eeti_ts", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, eeti_ts_id);
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static struct i2c_driver eeti_ts_driver = {
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.driver = {
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.name = "eeti_ts",
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},
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.probe = eeti_ts_probe,
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.remove = __devexit_p(eeti_ts_remove),
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.suspend = eeti_ts_suspend,
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.resume = eeti_ts_resume,
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.id_table = eeti_ts_id,
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};
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static int __init eeti_ts_init(void)
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{
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return i2c_add_driver(&eeti_ts_driver);
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}
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static void __exit eeti_ts_exit(void)
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{
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i2c_del_driver(&eeti_ts_driver);
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}
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MODULE_DESCRIPTION("EETI Touchscreen driver");
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MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
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MODULE_LICENSE("GPL");
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module_init(eeti_ts_init);
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module_exit(eeti_ts_exit);
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