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![Arnd Bergmann](/assets/img/avatar_default.png)
The migor touchscreen driver is now available for COMPILE_TEST, so we run into a harmless randconfig warning on ARM when CONFIG_PM is disabled: drivers/input/touchscreen/migor_ts.c:216:12: error: 'migor_ts_resume' defined but not used [-Werror=unused-function] drivers/input/touchscreen/migor_ts.c:205:12: error: 'migor_ts_suspend' defined but not used [-Werror=unused-function] This shuts up the warning by marking the two functions as __maybe_unused. We could do the same thing by adding an #ifdef, but this version is more reliable. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
249 lines
6.1 KiB
C
249 lines
6.1 KiB
C
/*
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* Touch Screen driver for Renesas MIGO-R Platform
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*
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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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* Kenati Technologies Pvt Ltd.
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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/kernel.h>
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#include <linux/input.h>
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#include <linux/interrupt.h>
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#include <linux/pm.h>
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#include <linux/slab.h>
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#include <asm/io.h>
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#include <linux/i2c.h>
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#include <linux/timer.h>
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#define EVENT_PENDOWN 1
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#define EVENT_REPEAT 2
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#define EVENT_PENUP 3
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struct migor_ts_priv {
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struct i2c_client *client;
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struct input_dev *input;
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int irq;
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};
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static const u_int8_t migor_ts_ena_seq[17] = { 0x33, 0x22, 0x11,
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0x01, 0x06, 0x07, };
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static const u_int8_t migor_ts_dis_seq[17] = { };
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static irqreturn_t migor_ts_isr(int irq, void *dev_id)
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{
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struct migor_ts_priv *priv = dev_id;
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unsigned short xpos, ypos;
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unsigned char event;
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u_int8_t buf[16];
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/*
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* The touch screen controller chip is hooked up to the CPU
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* using I2C and a single interrupt line. The interrupt line
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* is pulled low whenever someone taps the screen. To deassert
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* the interrupt line we need to acknowledge the interrupt by
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* communicating with the controller over the slow i2c bus.
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*
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* Since I2C bus controller may sleep we are using threaded
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* IRQ here.
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*/
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memset(buf, 0, sizeof(buf));
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/* Set Index 0 */
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buf[0] = 0;
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if (i2c_master_send(priv->client, buf, 1) != 1) {
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dev_err(&priv->client->dev, "Unable to write i2c index\n");
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goto out;
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}
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/* Now do Page Read */
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if (i2c_master_recv(priv->client, buf, sizeof(buf)) != sizeof(buf)) {
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dev_err(&priv->client->dev, "Unable to read i2c page\n");
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goto out;
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}
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ypos = ((buf[9] & 0x03) << 8 | buf[8]);
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xpos = ((buf[11] & 0x03) << 8 | buf[10]);
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event = buf[12];
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switch (event) {
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case EVENT_PENDOWN:
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case EVENT_REPEAT:
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input_report_key(priv->input, BTN_TOUCH, 1);
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input_report_abs(priv->input, ABS_X, ypos); /*X-Y swap*/
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input_report_abs(priv->input, ABS_Y, xpos);
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input_sync(priv->input);
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break;
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case EVENT_PENUP:
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input_report_key(priv->input, BTN_TOUCH, 0);
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input_sync(priv->input);
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break;
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}
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out:
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return IRQ_HANDLED;
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}
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static int migor_ts_open(struct input_dev *dev)
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{
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struct migor_ts_priv *priv = input_get_drvdata(dev);
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struct i2c_client *client = priv->client;
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int count;
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/* enable controller */
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count = i2c_master_send(client, migor_ts_ena_seq,
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sizeof(migor_ts_ena_seq));
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if (count != sizeof(migor_ts_ena_seq)) {
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dev_err(&client->dev, "Unable to enable touchscreen.\n");
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return -ENXIO;
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}
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return 0;
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}
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static void migor_ts_close(struct input_dev *dev)
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{
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struct migor_ts_priv *priv = input_get_drvdata(dev);
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struct i2c_client *client = priv->client;
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disable_irq(priv->irq);
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/* disable controller */
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i2c_master_send(client, migor_ts_dis_seq, sizeof(migor_ts_dis_seq));
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enable_irq(priv->irq);
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}
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static int migor_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 migor_ts_priv *priv;
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struct input_dev *input;
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int error;
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priv = kzalloc(sizeof(*priv), GFP_KERNEL);
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input = input_allocate_device();
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if (!priv || !input) {
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dev_err(&client->dev, "failed to allocate memory\n");
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error = -ENOMEM;
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goto err_free_mem;
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}
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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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input->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
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__set_bit(BTN_TOUCH, input->keybit);
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input_set_abs_params(input, ABS_X, 95, 955, 0, 0);
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input_set_abs_params(input, ABS_Y, 85, 935, 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 = migor_ts_open;
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input->close = migor_ts_close;
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input_set_drvdata(input, priv);
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error = request_threaded_irq(priv->irq, NULL, migor_ts_isr,
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IRQF_TRIGGER_LOW | IRQF_ONESHOT,
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client->name, priv);
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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, priv);
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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(priv->irq, priv);
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err_free_mem:
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input_free_device(input);
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kfree(priv);
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return error;
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}
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static int migor_ts_remove(struct i2c_client *client)
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{
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struct migor_ts_priv *priv = i2c_get_clientdata(client);
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free_irq(priv->irq, priv);
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input_unregister_device(priv->input);
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kfree(priv);
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dev_set_drvdata(&client->dev, NULL);
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return 0;
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}
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static int __maybe_unused migor_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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struct migor_ts_priv *priv = i2c_get_clientdata(client);
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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 __maybe_unused migor_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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struct migor_ts_priv *priv = i2c_get_clientdata(client);
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if (device_may_wakeup(&client->dev))
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disable_irq_wake(priv->irq);
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return 0;
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}
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static SIMPLE_DEV_PM_OPS(migor_ts_pm, migor_ts_suspend, migor_ts_resume);
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static const struct i2c_device_id migor_ts_id[] = {
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{ "migor_ts", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, migor_ts_id);
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static struct i2c_driver migor_ts_driver = {
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.driver = {
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.name = "migor_ts",
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.pm = &migor_ts_pm,
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},
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.probe = migor_ts_probe,
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.remove = migor_ts_remove,
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.id_table = migor_ts_id,
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};
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module_i2c_driver(migor_ts_driver);
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MODULE_DESCRIPTION("MigoR Touchscreen driver");
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MODULE_AUTHOR("Magnus Damm <damm@opensource.se>");
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MODULE_LICENSE("GPL");
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