>From e90718a2fa33442c3897185653cbf5fd9a9d7bfe Mon Sep 17 00:00:00 2001
From: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
Date: Tue, 27 Sep 2011 11:22:25 +0200
Subject: [PATCH v3] input: Add a driver TSC-40 (serial)
This patch adds the TSC-40 serial touchscreen driver and
should be compatible with TSC-10 and TSC-25.
The driver was written by Linutronix on behalf of
Bachmann electronic GmbH.
Changes v2 -> v3:
- remove fake pressure reporting
- incorporated feedback from Dmitry Torokhov
Changes v1 -> v2:
- initialisation of the controller moved to inputattach
- incorporated feedback from Dmitry Torokhov and
Sebastian Andrzej Siewior
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
Signed-off-by: Christian Gmeiner <christian.gmeiner@xxxxxxxxx>
---
drivers/input/touchscreen/Kconfig | 12 +++
drivers/input/touchscreen/Makefile | 1 +
drivers/input/touchscreen/tsc40.c | 172 ++++++++++++++++++++++++++++++++++++
include/linux/serio.h | 1 +
4 files changed, 186 insertions(+), 0 deletions(-)
create mode 100644 drivers/input/touchscreen/tsc40.c
diff --git a/drivers/input/touchscreen/Kconfig
b/drivers/input/touchscreen/Kconfig
index cabd9e5..a51635c 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -651,6 +651,18 @@ config TOUCHSCREEN_TOUCHIT213
To compile this driver as a module, choose M here: the
module will be called touchit213.
+config TOUCHSCREEN_TSC_SERIO
+ tristate "TSC-10/25/40 serial touchscreen"
+ select SERIO
+ help
+ Say Y here if you have a TSC-10, 25 or 40 serial touchscreen connected
+ to your system.
+
+ If unsure, say N.
+
+ To compile this driver as a module, choose M here: the
+ module will be called tsc40.
+
config TOUCHSCREEN_TSC2005
tristate "TSC2005 based touchscreens"
depends on SPI_MASTER && GENERIC_HARDIRQS
diff --git a/drivers/input/touchscreen/Makefile
b/drivers/input/touchscreen/Makefile
index 282d6f7..f957676 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -46,6 +46,7 @@ obj-$(CONFIG_TOUCHSCREEN_TNETV107X) += tnetv107x-ts.o
obj-$(CONFIG_TOUCHSCREEN_TOUCHIT213) += touchit213.o
obj-$(CONFIG_TOUCHSCREEN_TOUCHRIGHT) += touchright.o
obj-$(CONFIG_TOUCHSCREEN_TOUCHWIN) += touchwin.o
+obj-$(CONFIG_TOUCHSCREEN_TSC_SERIO) += tsc40.o
obj-$(CONFIG_TOUCHSCREEN_TSC2005) += tsc2005.o
obj-$(CONFIG_TOUCHSCREEN_TSC2007) += tsc2007.o
obj-$(CONFIG_TOUCHSCREEN_UCB1400) += ucb1400_ts.o
diff --git a/drivers/input/touchscreen/tsc40.c
b/drivers/input/touchscreen/tsc40.c
new file mode 100644
index 0000000..3aa9048
--- /dev/null
+++ b/drivers/input/touchscreen/tsc40.c
@@ -0,0 +1,172 @@
+/*
+ * TSC-40 serial touchscreen driver. It should be compatiible with
TSC-10 and 25.
+ * Author: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
+ * License: GPLv2 as published by the FSF.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/input.h>
+#include <linux/serio.h>
+#include <linux/init.h>
+
+#define PACKET_LENGTH 5
+struct tsc_ser {
+ struct input_dev *dev;
+ struct serio *serio;
+ u32 idx;
+ unsigned char data[PACKET_LENGTH];
+ char phys[32];
+};
+
+static void tsc_process_data(struct tsc_ser *ptsc)
+{
+ struct input_dev *dev = ptsc->dev;
+ u8 *data = ptsc->data;
+ u32 x;
+ u32 y;
+
+ x = ((data[1] & 0x03) << 8) | data[2];
+ y = ((data[3] & 0x03) << 8) | data[4];
+
+ input_report_abs(dev, ABS_X, x);
+ input_report_abs(dev, ABS_Y, y);
+ input_report_key(dev, BTN_TOUCH, 1);
+
+ input_sync(dev);
+
+ ptsc->idx = 0;
+}
+
+static bool pen_is_up(u8 data)
+{
+ /* SW[01] are unknown */
+ u8 val = data & 0x3f;
+ u8 up_val = 1 << 4;
+
+ return val == up_val;
+}
+
+static irqreturn_t tsc_interrupt(struct serio *serio,
+ unsigned char data, unsigned int flags)
+{
+ struct tsc_ser *ptsc = serio_get_drvdata(serio);
+ struct input_dev *dev = ptsc->dev;
+
+ if (!ptsc->idx && pen_is_up(data)) {
+ input_report_key(dev, BTN_TOUCH, 0);
+ input_sync(dev);
+ return IRQ_HANDLED;
+ }
+
+ ptsc->data[ptsc->idx] = data;
+ ptsc->idx++;
+
+ if (ptsc->idx < PACKET_LENGTH)
+ return IRQ_HANDLED;
+
+ tsc_process_data(ptsc);
+
+ return IRQ_HANDLED;
+}
+
+static int tsc_connect(struct serio *serio, struct serio_driver *drv)
+{
+ struct tsc_ser *ptsc;
+ struct input_dev *input_dev;
+ int ret;
+
+ ptsc = kzalloc(sizeof(struct tsc_ser), GFP_KERNEL);
+ input_dev = input_allocate_device();
+ if (!ptsc || !input_dev) {
+ ret = -ENOMEM;
+ goto fail1;
+ }
+
+ ptsc->serio = serio;
+ ptsc->dev = input_dev;
+ snprintf(ptsc->phys, sizeof(ptsc->phys), "%s/input0", serio->phys);
+
+ input_dev->name = "TSC-10/25/40 Serial TouchScreen";
+ input_dev->phys = ptsc->phys;
+ input_dev->id.bustype = BUS_RS232;
+ input_dev->id.vendor = SERIO_TSC40;
+ input_dev->id.product = 40;
+ input_dev->id.version = 0x0001;
+ input_dev->dev.parent = &serio->dev;
+ input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
+ input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
+ input_set_abs_params(ptsc->dev, ABS_X, 0, 0x3ff, 0, 0);
+ input_set_abs_params(ptsc->dev, ABS_Y, 0, 0x3ff, 0, 0);
+ input_set_abs_params(ptsc->dev, ABS_PRESSURE, 0, 0, 0, 0);
+ serio_set_drvdata(serio, ptsc);
+
+ ret = serio_open(serio, drv);
+ if (ret)
+ goto fail2;
+
+ ret = input_register_device(ptsc->dev);
+ if (ret)
+ goto fail3;
+
+ return 0;
+fail3:
+ serio_close(serio);
+fail2:
+ serio_set_drvdata(serio, NULL);
+fail1:
+ input_free_device(input_dev);
+ kfree(ptsc);
+ return ret;
+}
+
+static void tsc_disconnect(struct serio *serio)
+{
+ struct tsc_ser *ptsc = serio_get_drvdata(serio);
+
+ serio_close(serio);
+ input_unregister_device(ptsc->dev);
+ kfree(ptsc);
+ serio_set_drvdata(serio, NULL);
+}
+
+static struct serio_device_id tsc_serio_ids[] = {
+ {
+ .type = SERIO_RS232,
+ .proto = SERIO_TSC40,
+ .id = SERIO_ANY,
+ .extra = SERIO_ANY,
+ },
+ { 0 }
+};
+MODULE_DEVICE_TABLE(serio, tsc_serio_ids);
+
+#define DRIVER_DESC "TSC-10/25/40 serial touchscreen driver"
+
+static struct serio_driver tsc_drv = {
+ .driver = {
+ .name = "tsc40",
+ },
+ .description = DRIVER_DESC,
+ .id_table = tsc_serio_ids,
+ .interrupt = tsc_interrupt,
+ .connect = tsc_connect,
+ .disconnect = tsc_disconnect,
+};
+
+static int __init tsc_ser_init(void)
+{
+ return serio_register_driver(&tsc_drv);
+}
+module_init(tsc_ser_init);
+
+static void __exit tsc_exit(void)
+{
+ serio_unregister_driver(&tsc_drv);
+}
+module_exit(tsc_exit);
+
+MODULE_AUTHOR("Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>");
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPLv2");
diff --git a/include/linux/serio.h b/include/linux/serio.h
index e26f478..be7dfb0 100644
--- a/include/linux/serio.h
+++ b/include/linux/serio.h
@@ -199,5 +199,6 @@ static inline void serio_continue_rx(struct serio *serio)
#define SERIO_DYNAPRO 0x3a
#define SERIO_HAMPSHIRE 0x3b
#define SERIO_PS2MULT 0x3c
+#define SERIO_TSC40 0x3d
#endif
--
1.7.4.1
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