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This patch introduces support for Sitronix ST1232 integrated capacitive touchscreen with LCD module. The touchscreen is multitouch capable and can report coordinates of up to two contact points. Signed-off-by: Tony SIM <chinyeow.sim.xt@renesas.com> Reviewed-by: Trilok Soni <tsoni@codeaurora.org> Acked-by: Henrik Rydberg <rydberg@euromail.se> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
275 lines
6.2 KiB
C
275 lines
6.2 KiB
C
/*
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* ST1232 Touchscreen Controller Driver
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*
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* Copyright (C) 2010 Renesas Solutions Corp.
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* Tony SIM <chinyeow.sim.xt@renesas.com>
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*
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* Using code from:
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* - android.git.kernel.org: projects/kernel/common.git: synaptics_i2c_rmi.c
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* Copyright (C) 2007 Google, 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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#include <linux/delay.h>
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#include <linux/i2c.h>
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#include <linux/input.h>
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#include <linux/interrupt.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#define ST1232_TS_NAME "st1232-ts"
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#define MIN_X 0x00
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#define MIN_Y 0x00
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#define MAX_X 0x31f /* (800 - 1) */
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#define MAX_Y 0x1df /* (480 - 1) */
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#define MAX_AREA 0xff
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#define MAX_FINGERS 2
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struct st1232_ts_finger {
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u16 x;
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u16 y;
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u8 t;
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bool is_valid;
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};
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struct st1232_ts_data {
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struct i2c_client *client;
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struct input_dev *input_dev;
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struct st1232_ts_finger finger[MAX_FINGERS];
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};
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static int st1232_ts_read_data(struct st1232_ts_data *ts)
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{
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struct st1232_ts_finger *finger = ts->finger;
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struct i2c_client *client = ts->client;
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struct i2c_msg msg[2];
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int error;
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u8 start_reg;
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u8 buf[10];
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/* read touchscreen data from ST1232 */
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msg[0].addr = client->addr;
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msg[0].flags = 0;
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msg[0].len = 1;
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msg[0].buf = &start_reg;
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start_reg = 0x10;
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msg[1].addr = ts->client->addr;
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msg[1].flags = I2C_M_RD;
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msg[1].len = sizeof(buf);
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msg[1].buf = buf;
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error = i2c_transfer(client->adapter, msg, 2);
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if (error < 0)
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return error;
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/* get "valid" bits */
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finger[0].is_valid = buf[2] >> 7;
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finger[1].is_valid = buf[5] >> 7;
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/* get xy coordinate */
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if (finger[0].is_valid) {
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finger[0].x = ((buf[2] & 0x0070) << 4) | buf[3];
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finger[0].y = ((buf[2] & 0x0007) << 8) | buf[4];
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finger[0].t = buf[8];
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}
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if (finger[1].is_valid) {
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finger[1].x = ((buf[5] & 0x0070) << 4) | buf[6];
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finger[1].y = ((buf[5] & 0x0007) << 8) | buf[7];
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finger[1].t = buf[9];
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}
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return 0;
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}
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static irqreturn_t st1232_ts_irq_handler(int irq, void *dev_id)
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{
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struct st1232_ts_data *ts = dev_id;
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struct st1232_ts_finger *finger = ts->finger;
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struct input_dev *input_dev = ts->input_dev;
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int count = 0;
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int i, ret;
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ret = st1232_ts_read_data(ts);
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if (ret < 0)
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goto end;
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/* multi touch protocol */
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for (i = 0; i < MAX_FINGERS; i++) {
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if (!finger[i].is_valid)
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continue;
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input_report_abs(input_dev, ABS_MT_TOUCH_MAJOR, finger[i].t);
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input_report_abs(input_dev, ABS_MT_POSITION_X, finger[i].x);
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input_report_abs(input_dev, ABS_MT_POSITION_Y, finger[i].y);
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input_mt_sync(input_dev);
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count++;
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}
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/* SYN_MT_REPORT only if no contact */
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if (!count)
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input_mt_sync(input_dev);
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/* SYN_REPORT */
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input_sync(input_dev);
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end:
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return IRQ_HANDLED;
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}
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static int __devinit st1232_ts_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct st1232_ts_data *ts;
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struct input_dev *input_dev;
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int error;
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if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
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dev_err(&client->dev, "need I2C_FUNC_I2C\n");
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return -EIO;
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}
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if (!client->irq) {
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dev_err(&client->dev, "no IRQ?\n");
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return -EINVAL;
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}
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ts = kzalloc(sizeof(struct st1232_ts_data), GFP_KERNEL);
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input_dev = input_allocate_device();
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if (!ts || !input_dev) {
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error = -ENOMEM;
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goto err_free_mem;
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}
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ts->client = client;
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ts->input_dev = input_dev;
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input_dev->name = "st1232-touchscreen";
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input_dev->id.bustype = BUS_I2C;
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input_dev->dev.parent = &client->dev;
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__set_bit(EV_SYN, input_dev->evbit);
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__set_bit(EV_KEY, input_dev->evbit);
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__set_bit(EV_ABS, input_dev->evbit);
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input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR, 0, MAX_AREA, 0, 0);
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input_set_abs_params(input_dev, ABS_MT_POSITION_X, MIN_X, MAX_X, 0, 0);
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input_set_abs_params(input_dev, ABS_MT_POSITION_Y, MIN_Y, MAX_Y, 0, 0);
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error = request_threaded_irq(client->irq, NULL, st1232_ts_irq_handler,
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IRQF_ONESHOT, client->name, ts);
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if (error) {
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dev_err(&client->dev, "Failed to register interrupt\n");
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goto err_free_mem;
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}
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error = input_register_device(ts->input_dev);
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if (error) {
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dev_err(&client->dev, "Unable to register %s input device\n",
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input_dev->name);
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goto err_free_irq;
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}
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i2c_set_clientdata(client, ts);
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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, ts);
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err_free_mem:
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input_free_device(input_dev);
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kfree(ts);
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return error;
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}
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static int __devexit st1232_ts_remove(struct i2c_client *client)
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{
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struct st1232_ts_data *ts = i2c_get_clientdata(client);
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device_init_wakeup(&client->dev, 0);
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free_irq(client->irq, ts);
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input_unregister_device(ts->input_dev);
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kfree(ts);
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return 0;
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}
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#ifdef CONFIG_PM
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static int st1232_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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else
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disable_irq(client->irq);
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return 0;
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}
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static int st1232_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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else
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enable_irq(client->irq);
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return 0;
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}
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static const struct dev_pm_ops st1232_ts_pm_ops = {
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.suspend = st1232_ts_suspend,
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.resume = st1232_ts_resume,
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};
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#endif
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static const struct i2c_device_id st1232_ts_id[] = {
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{ ST1232_TS_NAME, 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, st1232_ts_id);
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static struct i2c_driver st1232_ts_driver = {
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.probe = st1232_ts_probe,
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.remove = __devexit_p(st1232_ts_remove),
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.id_table = st1232_ts_id,
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.driver = {
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.name = ST1232_TS_NAME,
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.owner = THIS_MODULE,
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#ifdef CONFIG_PM
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.pm = &st1232_ts_pm_ops,
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#endif
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},
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};
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static int __init st1232_ts_init(void)
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{
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return i2c_add_driver(&st1232_ts_driver);
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}
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module_init(st1232_ts_init);
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static void __exit st1232_ts_exit(void)
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{
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i2c_del_driver(&st1232_ts_driver);
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}
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module_exit(st1232_ts_exit);
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MODULE_AUTHOR("Tony SIM <chinyeow.sim.xt@renesas.com>");
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MODULE_DESCRIPTION("SITRONIX ST1232 Touchscreen Controller Driver");
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MODULE_LICENSE("GPL");
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