282 lines
6.9 KiB
C
282 lines
6.9 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/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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struct delayed_work work;
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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 void migor_ts_poscheck(struct work_struct *work)
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{
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struct migor_ts_priv *priv = container_of(work,
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struct migor_ts_priv,
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work.work);
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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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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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if (event == EVENT_PENDOWN || event == 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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} else if (event == 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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}
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out:
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enable_irq(priv->irq);
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}
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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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/* 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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* we can't acknowledge from interrupt context since the i2c
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* bus controller may sleep, so we just disable the interrupt
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* here and handle the acknowledge using delayed work.
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*/
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disable_irq_nosync(irq);
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schedule_delayed_work(&priv->work, HZ / 20);
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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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/* cancel pending work and wait for migor_ts_poscheck() to finish */
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if (cancel_delayed_work_sync(&priv->work)) {
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/*
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* if migor_ts_poscheck was canceled we need to enable IRQ
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* here to balance disable done in migor_ts_isr.
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*/
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enable_irq(priv->irq);
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}
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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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if (!priv) {
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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 err0;
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}
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dev_set_drvdata(&client->dev, priv);
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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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error = -ENOMEM;
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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, 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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priv->client = client;
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priv->input = input;
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INIT_DELAYED_WORK(&priv->work, migor_ts_poscheck);
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priv->irq = client->irq;
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error = input_register_device(input);
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if (error)
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goto err1;
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error = request_irq(priv->irq, migor_ts_isr, IRQF_TRIGGER_LOW,
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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 err2;
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}
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device_init_wakeup(&client->dev, 1);
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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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dev_set_drvdata(&client->dev, NULL);
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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 = dev_get_drvdata(&client->dev);
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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 migor_ts_suspend(struct i2c_client *client, pm_message_t mesg)
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{
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struct migor_ts_priv *priv = dev_get_drvdata(&client->dev);
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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 migor_ts_resume(struct i2c_client *client)
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{
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struct migor_ts_priv *priv = dev_get_drvdata(&client->dev);
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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 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);
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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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},
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.probe = migor_ts_probe,
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.remove = migor_ts_remove,
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.suspend = migor_ts_suspend,
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.resume = migor_ts_resume,
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.id_table = migor_ts_id,
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};
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static int __init migor_ts_init(void)
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{
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return i2c_add_driver(&migor_ts_driver);
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}
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static void __exit migor_ts_exit(void)
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{
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i2c_del_driver(&migor_ts_driver);
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}
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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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module_init(migor_ts_init);
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module_exit(migor_ts_exit);
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