From: Tony SIM <chinyeow.sim.xt@xxxxxxxxxxx>
This patch set introduces for Sitronix ST1232 touchscreen controller
driver. This is an integrated capacitive touchscreen with LCD module
which can detect two fingers's touch X/Y coordinate.
Signed-off-by: Tony SIM <chinyeow.sim.xt@xxxxxxxxxxx>
---
Changes since v1:
- Removed polling mode.
- Removed EARLYSUSPEND relative code.
- Removed ST event.
- Added touch size report.
- Modified pointed out driver writing style.
MAX_X/MAX_Y set as constant because of this is a build-in touchscreen with
LCD module.
drivers/input/touchscreen/Kconfig | 11 ++
drivers/input/touchscreen/Makefile | 1 +
drivers/input/touchscreen/st1232.c | 265 ++++++++++++++++++++++++++++++++++++
3 files changed, 277 insertions(+), 0 deletions(-)
create mode 100644 drivers/input/touchscreen/st1232.c
diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index 06ea8da..3ca7700 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -681,4 +681,15 @@ config TOUCHSCREEN_STMPE
To compile this driver as a module, choose M here: the
module will be called stmpe-ts.
+config TOUCHSCREEN_ST1232
+ tristate "Sitronix ST1232 touchscreen controllers"
+ depends on I2C
+ help
+ Say Y here if you want to support Sitronix ST1232
+ touchscreen controller.
+
+ If unsure, say N.
+
+ To compile this driver as a module, choose M here: the
+ module will be called st1232_ts.
endif
diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
index 7cc1b4f..718bcc8 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -39,6 +39,7 @@ obj-$(CONFIG_TOUCHSCREEN_PCAP) += pcap_ts.o
obj-$(CONFIG_TOUCHSCREEN_PENMOUNT) += penmount.o
obj-$(CONFIG_TOUCHSCREEN_QT602240) += qt602240_ts.o
obj-$(CONFIG_TOUCHSCREEN_S3C2410) += s3c2410_ts.o
+obj-$(CONFIG_TOUCHSCREEN_ST1232) += st1232.o
obj-$(CONFIG_TOUCHSCREEN_STMPE) += stmpe-ts.o
obj-$(CONFIG_TOUCHSCREEN_TNETV107X) += tnetv107x-ts.o
obj-$(CONFIG_TOUCHSCREEN_TOUCHIT213) += touchit213.o
diff --git a/drivers/input/touchscreen/st1232.c b/drivers/input/touchscreen/st1232.c
new file mode 100644
index 0000000..f48ae8a
--- /dev/null
+++ b/drivers/input/touchscreen/st1232.c
@@ -0,0 +1,265 @@
+/*
+ * ST1232 Touchscreen Controller Driver
+ *
+ * Copyright (C) 2010 Renesas Solutions Corp.
+ * Tony SIM <chinyeow.sim.xt@xxxxxxxxxxx>
+ *
+ * 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>
+
+#define ST1232_TS_NAME "st1232-ts"
+
+#define XY0 0
+#define XY1 1
+#define MAX_FINGERS 2
+
+#define MIN_X 0x00
+#define MIN_Y 0x00
+#define MAX_X 0x31f /* (800 - 1) */
+#define MAX_Y 0x1df /* (480 - 1) */
+#define MAX_AREA 0xff
+
+struct st1232_ts_data {
+ struct i2c_client *client;
+ struct input_dev *input_dev;
+ struct delayed_work work;
+};
+
+static void st1232_ts_work_func(struct work_struct *work)
+{
+ int i, ret;
+ struct i2c_msg msg[2];
+ uint8_t start_reg;
+ uint8_t buf[10];
+ struct st1232_ts_data *ts =
+ container_of(work, struct st1232_ts_data, work.work);
+ uint16_t x[MAX_FINGERS], y[MAX_FINGERS];
+ uint8_t t[MAX_FINGERS];
+ uint8_t is_valid[MAX_FINGERS];
+
+ /* read touchscreen data from ST1232 */
+ msg[0].addr = ts->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;
+
+ ret = i2c_transfer(ts->client->adapter, msg, 2);
+ if (ret < 0)
+ goto done;
+
+ /* get valid bit */
+ is_valid[XY0] = buf[2] >> 7;
+ is_valid[XY1] = buf[5] >> 7;
+
+ /* get xy coordinate */
+ if (is_valid[XY0]) {
+ x[XY0] = ((buf[2] & 0x0070) << 4) | buf[3];
+ y[XY0] = ((buf[2] & 0x0007) << 8) | buf[4];
+ t[XY0] = buf[8];
+ }
+
+ if (is_valid[XY1]) {
+ x[XY1] = ((buf[5] & 0x0070) << 4) | buf[6];
+ y[XY1] = ((buf[5] & 0x0007) << 8) | buf[7];
+ t[XY1] = buf[9];
+ }
+
+ /* multi touch protocol */
+ for (i = 0; i < MAX_FINGERS; i++) {
+ if (!is_valid[i]) {
+ input_report_abs(ts->input_dev, ABS_MT_TOUCH_MAJOR, 0);
+ continue;
+ }
+
+ input_report_abs(ts->input_dev, ABS_MT_TOUCH_MAJOR, t[i]);
+ input_report_abs(ts->input_dev, ABS_MT_POSITION_X, x[i]);
+ input_report_abs(ts->input_dev, ABS_MT_POSITION_Y, y[i]);
+ input_mt_sync(ts->input_dev);
+ }
+
+ /* EV_SYN */
+ input_sync(ts->input_dev);
+
+done:
+ enable_irq(ts->client->irq);
+
+ return;
+}
+
+static irqreturn_t st1232_ts_irq_handler(int irq, void *dev_id)
+{
+ struct st1232_ts_data *ts = dev_id;
+
+ disable_irq_nosync(irq);
+ schedule_delayed_work(&ts->work, msecs_to_jiffies(2));
+
+ return IRQ_HANDLED;
+}
+
+static int __devinit st1232_ts_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct st1232_ts_data *ts;
+ int ret;
+
+ if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
+ dev_err(&client->dev, "need I2C_FUNC_I2C\n");
+ return -EIO;
+ }
+
+ ts = kzalloc(sizeof(struct st1232_ts_data), GFP_KERNEL);
+ if (!ts) {
+ ret = -ENOMEM;
+ goto err;
+ }
+ INIT_DELAYED_WORK(&ts->work, st1232_ts_work_func);
+ ts->client = client;
+ i2c_set_clientdata(client, ts);
+
+ ts->input_dev = input_allocate_device();
+ if (!ts->input_dev) {
+ ret = -ENOMEM;
+ dev_err(&client->dev, "Failed to allocate input device\n");
+ goto err_free_mem;
+ }
+ ts->input_dev->name = "st1232-touchscreen";
+
+ __set_bit(EV_SYN, ts->input_dev->evbit);
+ __set_bit(EV_KEY, ts->input_dev->evbit);
+ __set_bit(EV_ABS, ts->input_dev->evbit);
+
+ input_set_abs_params(ts->input_dev, ABS_MT_TOUCH_MAJOR,
+ 0, MAX_AREA, 0, 0);
+ input_set_abs_params(ts->input_dev, ABS_MT_POSITION_X,
+ MIN_X, MAX_X, 0, 0);
+ input_set_abs_params(ts->input_dev, ABS_MT_POSITION_Y,
+ MIN_Y, MAX_Y, 0, 0);
+
+ ret = input_register_device(ts->input_dev);
+ if (ret) {
+ dev_err(&client->dev, "Unable to register %s input device\n",
+ ts->input_dev->name);
+ goto err_free_input_device;
+ }
+
+ ret = request_threaded_irq(client->irq, st1232_ts_irq_handler, NULL,
+ IRQF_TRIGGER_NONE, client->name, ts);
+ if (ret) {
+ dev_err(&client->dev, "Failed to register interrupt\n");
+ goto err_free_input_device;
+ }
+
+ return 0;
+
+err_free_input_device:
+ input_free_device(ts->input_dev);
+err_free_mem:
+ kfree(ts);
+err:
+ return ret;
+}
+
+static int __devexit st1232_ts_remove(struct i2c_client *client)
+{
+ struct st1232_ts_data *ts = i2c_get_clientdata(client);
+
+ 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 st1232_ts_data *ts = dev_get_drvdata(dev);
+ struct i2c_client *client = ts->client;
+
+ 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 st1232_ts_data *ts = dev_get_drvdata(dev);
+ struct i2c_client *client = ts->client;
+
+ 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);
+}
+
+static void __exit st1232_ts_exit(void)
+{
+ i2c_del_driver(&st1232_ts_driver);
+}
+
+module_init(st1232_ts_init);
+module_exit(st1232_ts_exit);
+
+MODULE_AUTHOR("Tony SIM <chinyeow.sim.xt@xxxxxxxxxxx>");
+MODULE_DESCRIPTION("SITRONIX ST1232 Touchscreen Controller Driver");
+MODULE_LICENSE("GPL");
--
1.7.2.3
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