--- /dev/null
+/*
+ * ST1232 Touchscreen Controller Driver
+ *
+ * Copyright (C) 2010 Renesas Solutions Corp.
+ * Tony SIM <chinyeow.sim.xt@renesas.com>
+ *
+ * Using code from:
+ * - android.git.kernel.org: projects/kernel/common.git: synaptics_i2c_rmi.c
+ * Copyright (C) 2007 Google, Inc.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/delay.h>
+#include <linux/i2c.h>
+#include <linux/input.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+
+#define ST1232_TS_NAME "st1232-ts"
+
+#define MIN_X 0x00
+#define MIN_Y 0x00
+#define MAX_X 0x31f /* (800 - 1) */
+#define MAX_Y 0x1df /* (480 - 1) */
+#define MAX_AREA 0xff
+#define MAX_FINGERS 2
+
+struct st1232_ts_finger {
+ u16 x;
+ u16 y;
+ u8 t;
+ bool is_valid;
+};
+
+struct st1232_ts_data {
+ struct i2c_client *client;
+ struct input_dev *input_dev;
+ struct st1232_ts_finger finger[MAX_FINGERS];
+};
+
+static int st1232_ts_read_data(struct st1232_ts_data *ts)
+{
+ struct st1232_ts_finger *finger = ts->finger;
+ struct i2c_client *client = ts->client;
+ struct i2c_msg msg[2];
+ int error;
+ u8 start_reg;
+ u8 buf[10];
+
+ /* read touchscreen data from ST1232 */
+ msg[0].addr = client->addr;
+ msg[0].flags = 0;
+ msg[0].len = 1;
+ msg[0].buf = &start_reg;
+ start_reg = 0x10;
+
+ msg[1].addr = ts->client->addr;
+ msg[1].flags = I2C_M_RD;
+ msg[1].len = sizeof(buf);
+ msg[1].buf = buf;
+
+ error = i2c_transfer(client->adapter, msg, 2);
+ if (error < 0)
+ return error;
+
+ /* get "valid" bits */
+ finger[0].is_valid = buf[2] >> 7;
+ finger[1].is_valid = buf[5] >> 7;
+
+ /* get xy coordinate */
+ if (finger[0].is_valid) {
+ finger[0].x = ((buf[2] & 0x0070) << 4) | buf[3];
+ finger[0].y = ((buf[2] & 0x0007) << 8) | buf[4];
+ finger[0].t = buf[8];
+ }
+
+ if (finger[1].is_valid) {
+ finger[1].x = ((buf[5] & 0x0070) << 4) | buf[6];
+ finger[1].y = ((buf[5] & 0x0007) << 8) | buf[7];
+ finger[1].t = buf[9];
+ }
+
+ return 0;
+}
+
+static irqreturn_t st1232_ts_irq_handler(int irq, void *dev_id)
+{
+ struct st1232_ts_data *ts = dev_id;
+ struct st1232_ts_finger *finger = ts->finger;
+ struct input_dev *input_dev = ts->input_dev;
+ int count = 0;
+ int i, ret;
+
+ ret = st1232_ts_read_data(ts);
+ if (ret < 0)
+ goto end;
+
+ /* multi touch protocol */
+ for (i = 0; i < MAX_FINGERS; i++) {
+ if (!finger[i].is_valid)
+ continue;
+
+ input_report_abs(input_dev, ABS_MT_TOUCH_MAJOR, finger[i].t);
+ input_report_abs(input_dev, ABS_MT_POSITION_X, finger[i].x);
+ input_report_abs(input_dev, ABS_MT_POSITION_Y, finger[i].y);
+ input_mt_sync(input_dev);
+ count++;
+ }
+
+ /* SYN_MT_REPORT only if no contact */
+ if (!count)
+ input_mt_sync(input_dev);
+
+ /* SYN_REPORT */
+ input_sync(input_dev);
+
+end:
+ return IRQ_HANDLED;
+}
+
+static int __devinit st1232_ts_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct st1232_ts_data *ts;
+ struct input_dev *input_dev;
+ int error;
+
+ if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
+ dev_err(&client->dev, "need I2C_FUNC_I2C\n");
+ return -EIO;
+ }
+
+ if (!client->irq) {
+ dev_err(&client->dev, "no IRQ?\n");
+ return -EINVAL;
+ }
+
+
+ ts = kzalloc(sizeof(struct st1232_ts_data), GFP_KERNEL);
+ input_dev = input_allocate_device();
+ if (!ts || !input_dev) {
+ error = -ENOMEM;
+ goto err_free_mem;
+ }
+
+ ts->client = client;
+ ts->input_dev = input_dev;
+
+ input_dev->name = "st1232-touchscreen";
+ input_dev->id.bustype = BUS_I2C;
+ input_dev->dev.parent = &client->dev;
+
+ __set_bit(EV_SYN, input_dev->evbit);
+ __set_bit(EV_KEY, input_dev->evbit);
+ __set_bit(EV_ABS, input_dev->evbit);
+
+ input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR, 0, MAX_AREA, 0, 0);
+ input_set_abs_params(input_dev, ABS_MT_POSITION_X, MIN_X, MAX_X, 0, 0);
+ input_set_abs_params(input_dev, ABS_MT_POSITION_Y, MIN_Y, MAX_Y, 0, 0);
+
+ error = request_threaded_irq(client->irq, NULL, st1232_ts_irq_handler,
+ IRQF_ONESHOT, client->name, ts);
+ if (error) {
+ dev_err(&client->dev, "Failed to register interrupt\n");
+ goto err_free_mem;
+ }
+
+ error = input_register_device(ts->input_dev);
+ if (error) {
+ dev_err(&client->dev, "Unable to register %s input device\n",
+ input_dev->name);
+ goto err_free_irq;
+ }
+
+ i2c_set_clientdata(client, ts);
+ device_init_wakeup(&client->dev, 1);
+
+ return 0;
+
+err_free_irq:
+ free_irq(client->irq, ts);
+err_free_mem:
+ input_free_device(input_dev);
+ kfree(ts);
+ return error;
+}
+
+static int __devexit st1232_ts_remove(struct i2c_client *client)
+{
+ struct st1232_ts_data *ts = i2c_get_clientdata(client);
+
+ device_init_wakeup(&client->dev, 0);
+ free_irq(client->irq, ts);
+ input_unregister_device(ts->input_dev);
+ kfree(ts);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM
+static int st1232_ts_suspend(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+
+ if (device_may_wakeup(&client->dev))
+ enable_irq_wake(client->irq);
+ else
+ disable_irq(client->irq);
+
+ return 0;
+}
+
+static int st1232_ts_resume(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+
+ if (device_may_wakeup(&client->dev))
+ disable_irq_wake(client->irq);
+ else
+ enable_irq(client->irq);
+
+ return 0;
+}
+
+static const struct dev_pm_ops st1232_ts_pm_ops = {
+ .suspend = st1232_ts_suspend,
+ .resume = st1232_ts_resume,
+};
+#endif
+
+static const struct i2c_device_id st1232_ts_id[] = {
+ { ST1232_TS_NAME, 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, st1232_ts_id);
+
+static struct i2c_driver st1232_ts_driver = {
+ .probe = st1232_ts_probe,
+ .remove = __devexit_p(st1232_ts_remove),
+ .id_table = st1232_ts_id,
+ .driver = {
+ .name = ST1232_TS_NAME,
+ .owner = THIS_MODULE,
+#ifdef CONFIG_PM
+ .pm = &st1232_ts_pm_ops,
+#endif
+ },
+};
+
+static int __init st1232_ts_init(void)
+{
+ return i2c_add_driver(&st1232_ts_driver);
+}
+module_init(st1232_ts_init);
+
+static void __exit st1232_ts_exit(void)
+{
+ i2c_del_driver(&st1232_ts_driver);
+}
+module_exit(st1232_ts_exit);
+
+MODULE_AUTHOR("Tony SIM <chinyeow.sim.xt@renesas.com>");
+MODULE_DESCRIPTION("SITRONIX ST1232 Touchscreen Controller Driver");
+MODULE_LICENSE("GPL");
projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / commitdiff