![Lars-Peter Clausen](/assets/img/avatar_default.png)
Since commit 1c6c69525b
("genirq: Reject bogus threaded irq requests")
threaded IRQs without a primary handler need to be requested with
IRQF_ONESHOT, otherwise the request will fail. This patch adds the
IRQF_ONESHOT to input drivers where it is missing. Not modified by
this patch are those drivers where the requested IRQ will always be a
nested IRQ (e.g. because it's part of an MFD), since for this special
case IRQF_ONESHOT is not required to be specified when requesting the
IRQ.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
230 lines
5.7 KiB
C
230 lines
5.7 KiB
C
/*
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* Driver for Pixcir I2C touchscreen controllers.
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*
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* Copyright (C) 2010-2011 Pixcir, Inc.
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program 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
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* GNU 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/delay.h>
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/slab.h>
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#include <linux/i2c.h>
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#include <linux/input.h>
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#include <linux/input/pixcir_ts.h>
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struct pixcir_i2c_ts_data {
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struct i2c_client *client;
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struct input_dev *input;
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const struct pixcir_ts_platform_data *chip;
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bool exiting;
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};
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static void pixcir_ts_poscheck(struct pixcir_i2c_ts_data *data)
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{
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struct pixcir_i2c_ts_data *tsdata = data;
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u8 rdbuf[10], wrbuf[1] = { 0 };
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u8 touch;
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int ret;
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ret = i2c_master_send(tsdata->client, wrbuf, sizeof(wrbuf));
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if (ret != sizeof(wrbuf)) {
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dev_err(&tsdata->client->dev,
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"%s: i2c_master_send failed(), ret=%d\n",
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__func__, ret);
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return;
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}
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ret = i2c_master_recv(tsdata->client, rdbuf, sizeof(rdbuf));
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if (ret != sizeof(rdbuf)) {
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dev_err(&tsdata->client->dev,
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"%s: i2c_master_recv failed(), ret=%d\n",
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__func__, ret);
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return;
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}
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touch = rdbuf[0];
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if (touch) {
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u16 posx1 = (rdbuf[3] << 8) | rdbuf[2];
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u16 posy1 = (rdbuf[5] << 8) | rdbuf[4];
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u16 posx2 = (rdbuf[7] << 8) | rdbuf[6];
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u16 posy2 = (rdbuf[9] << 8) | rdbuf[8];
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input_report_key(tsdata->input, BTN_TOUCH, 1);
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input_report_abs(tsdata->input, ABS_X, posx1);
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input_report_abs(tsdata->input, ABS_Y, posy1);
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input_report_abs(tsdata->input, ABS_MT_POSITION_X, posx1);
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input_report_abs(tsdata->input, ABS_MT_POSITION_Y, posy1);
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input_mt_sync(tsdata->input);
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if (touch == 2) {
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input_report_abs(tsdata->input,
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ABS_MT_POSITION_X, posx2);
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input_report_abs(tsdata->input,
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ABS_MT_POSITION_Y, posy2);
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input_mt_sync(tsdata->input);
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}
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} else {
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input_report_key(tsdata->input, BTN_TOUCH, 0);
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}
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input_sync(tsdata->input);
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}
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static irqreturn_t pixcir_ts_isr(int irq, void *dev_id)
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{
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struct pixcir_i2c_ts_data *tsdata = dev_id;
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while (!tsdata->exiting) {
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pixcir_ts_poscheck(tsdata);
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if (tsdata->chip->attb_read_val())
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break;
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msleep(20);
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}
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return IRQ_HANDLED;
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}
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#ifdef CONFIG_PM_SLEEP
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static int pixcir_i2c_ts_suspend(struct device *dev)
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{
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struct i2c_client *client = to_i2c_client(dev);
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if (device_may_wakeup(&client->dev))
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enable_irq_wake(client->irq);
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return 0;
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}
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static int pixcir_i2c_ts_resume(struct device *dev)
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{
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struct i2c_client *client = to_i2c_client(dev);
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if (device_may_wakeup(&client->dev))
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disable_irq_wake(client->irq);
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return 0;
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}
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#endif
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static SIMPLE_DEV_PM_OPS(pixcir_dev_pm_ops,
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pixcir_i2c_ts_suspend, pixcir_i2c_ts_resume);
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static int __devinit pixcir_i2c_ts_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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const struct pixcir_ts_platform_data *pdata = client->dev.platform_data;
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struct pixcir_i2c_ts_data *tsdata;
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struct input_dev *input;
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int error;
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if (!pdata) {
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dev_err(&client->dev, "platform data not defined\n");
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return -EINVAL;
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}
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tsdata = kzalloc(sizeof(*tsdata), GFP_KERNEL);
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input = input_allocate_device();
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if (!tsdata || !input) {
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dev_err(&client->dev, "Failed to allocate driver data!\n");
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error = -ENOMEM;
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goto err_free_mem;
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}
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tsdata->client = client;
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tsdata->input = input;
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tsdata->chip = pdata;
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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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__set_bit(EV_KEY, input->evbit);
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__set_bit(EV_ABS, input->evbit);
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__set_bit(BTN_TOUCH, input->keybit);
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input_set_abs_params(input, ABS_X, 0, pdata->x_max, 0, 0);
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input_set_abs_params(input, ABS_Y, 0, pdata->y_max, 0, 0);
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input_set_abs_params(input, ABS_MT_POSITION_X, 0, pdata->x_max, 0, 0);
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input_set_abs_params(input, ABS_MT_POSITION_Y, 0, pdata->y_max, 0, 0);
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input_set_drvdata(input, tsdata);
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error = request_threaded_irq(client->irq, NULL, pixcir_ts_isr,
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IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
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client->name, tsdata);
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if (error) {
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dev_err(&client->dev, "Unable to request touchscreen IRQ.\n");
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goto err_free_mem;
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}
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error = input_register_device(input);
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if (error)
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goto err_free_irq;
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i2c_set_clientdata(client, tsdata);
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device_init_wakeup(&client->dev, 1);
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return 0;
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err_free_irq:
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free_irq(client->irq, tsdata);
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err_free_mem:
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input_free_device(input);
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kfree(tsdata);
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return error;
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}
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static int __devexit pixcir_i2c_ts_remove(struct i2c_client *client)
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{
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struct pixcir_i2c_ts_data *tsdata = i2c_get_clientdata(client);
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device_init_wakeup(&client->dev, 0);
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tsdata->exiting = true;
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mb();
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free_irq(client->irq, tsdata);
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input_unregister_device(tsdata->input);
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kfree(tsdata);
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return 0;
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}
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static const struct i2c_device_id pixcir_i2c_ts_id[] = {
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{ "pixcir_ts", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, pixcir_i2c_ts_id);
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static struct i2c_driver pixcir_i2c_ts_driver = {
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.driver = {
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.owner = THIS_MODULE,
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.name = "pixcir_ts",
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.pm = &pixcir_dev_pm_ops,
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},
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.probe = pixcir_i2c_ts_probe,
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.remove = __devexit_p(pixcir_i2c_ts_remove),
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.id_table = pixcir_i2c_ts_id,
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};
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module_i2c_driver(pixcir_i2c_ts_driver);
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MODULE_AUTHOR("Jianchun Bian <jcbian@pixcir.com.cn>, Dequan Meng <dqmeng@pixcir.com.cn>");
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MODULE_DESCRIPTION("Pixcir I2C Touchscreen Driver");
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MODULE_LICENSE("GPL");
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