Hi Dmitry, linux-input,
Thanks for your previous feedback. I've made the improvements to drop the use
of cmd mutex, expected packet, cleanup and report tilt events. Let me know
your thoughts.
Thanks,
jaya
The Wacom W8001 sensor is a sensor device (uses electromagnetic resonance)
and it is interfaced via its serial microcontroller to the host.
Signed-off-by: Jaya Kumar <jayakumar.lkml@xxxxxxxxx>
---
drivers/input/touchscreen/Kconfig | 13 ++
drivers/input/touchscreen/Makefile | 1 +
drivers/input/touchscreen/wacom_w8001.c | 290 +++++++++++++++++++++++++++++++
include/linux/serio.h | 1 +
4 files changed, 305 insertions(+), 0 deletions(-)
create mode 100644 drivers/input/touchscreen/wacom_w8001.c
diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index 6e1e8c6..239c4f6 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -91,6 +91,19 @@ config TOUCHSCREEN_ELO
To compile this driver as a module, choose M here: the
module will be called elo.
+config TOUCHSCREEN_WACOM_W8001
+ tristate "Wacom W8001 penabled serial touchscreen"
+ select SERIO
+ help
+ Say Y here if you have an Wacom W8001 penabled 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 wacom_w8001.
+
+
config TOUCHSCREEN_MTOUCH
tristate "MicroTouch serial touchscreens"
select SERIO
diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
index 15cf290..3dc84d3 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -26,6 +26,7 @@ obj-$(CONFIG_TOUCHSCREEN_TOUCHIT213) += touchit213.o
obj-$(CONFIG_TOUCHSCREEN_TOUCHRIGHT) += touchright.o
obj-$(CONFIG_TOUCHSCREEN_TOUCHWIN) += touchwin.o
obj-$(CONFIG_TOUCHSCREEN_UCB1400) += ucb1400_ts.o
+obj-$(CONFIG_TOUCHSCREEN_WACOM_W8001) += wacom_w8001.o
obj-$(CONFIG_TOUCHSCREEN_WM97XX) += wm97xx-ts.o
wm97xx-ts-$(CONFIG_TOUCHSCREEN_WM9705) += wm9705.o
wm97xx-ts-$(CONFIG_TOUCHSCREEN_WM9712) += wm9712.o
diff --git a/drivers/input/touchscreen/wacom_w8001.c b/drivers/input/touchscreen/wacom_w8001.c
new file mode 100644
index 0000000..6e39e72
--- /dev/null
+++ b/drivers/input/touchscreen/wacom_w8001.c
@@ -0,0 +1,290 @@
+/*
+ * Wacom W8001 penabled serial touchscreen driver
+ *
+ * Copyright (c) 2008 Jaya Kumar
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file COPYING in the main directory of this archive for
+ * more details.
+ *
+ * Layout based on Elo serial touchscreen driver by Vojtech Pavlik
+ */
+
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/input.h>
+#include <linux/serio.h>
+#include <linux/init.h>
+#include <linux/ctype.h>
+
+#define DRIVER_DESC "Wacom W8001 serial touchscreen driver"
+
+MODULE_AUTHOR("Jaya Kumar <jayakumar.lkml@xxxxxxxxx>");
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");
+
+/*
+ * Definitions & global arrays.
+ */
+
+#define W8001_MAX_LENGTH 11
+#define W8001_PACKET_LEN 11
+#define W8001_LEAD_MASK 0x80
+#define W8001_LEAD_BYTE 0x80
+#define W8001_TAB_MASK 0x40
+#define W8001_TAB_BYTE 0x40
+
+struct w8001_coord {
+ u8 rdy;
+ u8 tsw;
+ u8 f1;
+ u8 f2;
+ u16 x;
+ u16 y;
+ u16 pen_pressure;
+ u8 tilt_x;
+ u8 tilt_y;
+};
+
+/*
+ * Per-touchscreen data.
+ */
+
+struct w8001 {
+ struct input_dev *dev;
+ struct serio *serio;
+ struct completion cmd_done;
+ int id;
+ int idx;
+ unsigned char data[W8001_MAX_LENGTH];
+ unsigned char response[W8001_PACKET_LEN];
+ char phys[32];
+};
+
+static int parse_data(u8 *data, struct w8001_coord *coord)
+{
+ coord->rdy = data[0] & 0x20;
+ coord->tsw = data[0] & 0x01;
+ coord->f1 = data[0] & 0x02;
+ coord->f2 = data[0] & 0x04;
+
+ coord->x = (data[1] & 0x7F) << 9;
+ coord->x |= (data[2] & 0x7F) << 2;
+ coord->x |= (data[6] & 0x60) >> 5;
+
+ coord->y = (data[3] & 0x7F) << 9;
+ coord->y |= (data[4] & 0x7F) << 2;
+ coord->y |= (data[6] & 0x18) >> 3;
+
+ coord->pen_pressure = data[5] & 0x7F;
+ coord->pen_pressure |= (data[6] & 0x07) << 7 ;
+
+ coord->tilt_x = data[7] & 0x7F;
+ coord->tilt_y = data[8] & 0x7F;
+
+ return 0;
+}
+
+static void w8001_process_data(struct w8001 *w8001, unsigned char data)
+{
+ struct input_dev *dev = w8001->dev;
+ u8 tmp;
+ struct w8001_coord coord;
+
+ w8001->data[w8001->idx] = data;
+ switch (w8001->idx++) {
+ case 0:
+ if ((data & W8001_LEAD_MASK) != W8001_LEAD_BYTE) {
+ pr_debug("w8001: unsynchronized data: 0x%02x\n", data);
+ w8001->idx = 0;
+ }
+ break;
+ case 8:
+ tmp = w8001->data[0] & W8001_TAB_MASK;
+ if (unlikely(tmp == W8001_TAB_BYTE))
+ break;
+ w8001->idx = 0;
+ memset(&coord, 0, sizeof(coord));
+ parse_data(w8001->data, &coord);
+ input_report_abs(dev, ABS_X, coord.x);
+ input_report_abs(dev, ABS_Y, coord.y);
+ input_report_abs(dev, ABS_PRESSURE, coord.pen_pressure);
+ input_report_key(dev, BTN_TOUCH, coord.tsw);
+ input_report_abs(dev, ABS_TILT_X, coord.tilt_x);
+ input_report_abs(dev, ABS_TILT_Y, coord.tilt_y);
+ input_sync(dev);
+ break;
+ case 10:
+ w8001->idx = 0;
+ memcpy(w8001->response, &w8001->data, W8001_PACKET_LEN);
+ complete(&w8001->cmd_done);
+ break;
+ }
+}
+
+
+static irqreturn_t w8001_interrupt(struct serio *serio,
+ unsigned char data, unsigned int flags)
+{
+ struct w8001 *w8001 = serio_get_drvdata(serio);
+
+ w8001_process_data(w8001, data);
+
+ return IRQ_HANDLED;
+}
+
+static int w8001_command(struct w8001 *w8001, unsigned char *packet, int len)
+{
+ int i;
+
+ for (i = 0; i < len; i++) {
+ if (serio_write(w8001->serio, packet[i]))
+ return -EIO;
+ }
+
+ if (!wait_for_completion_timeout(&w8001->cmd_done, HZ))
+ return -ETIME;
+ else
+ return 0;
+}
+
+static int w8001_setup(struct w8001 *w8001)
+{
+ int rc;
+ struct w8001_coord coord;
+ struct input_dev *dev = w8001->dev;
+ unsigned char query[11] = { '*' };
+
+ rc = w8001_command(w8001, query, 1);
+ if (rc)
+ return rc;
+
+ memset(&coord, 0, sizeof(coord));
+ parse_data(query, &coord);
+
+ input_set_abs_params(dev, ABS_X, 0, coord.x, 0, 0);
+ input_set_abs_params(dev, ABS_Y, 0, coord.y, 0, 0);
+ input_set_abs_params(dev, ABS_PRESSURE, 0, coord.pen_pressure, 0, 0);
+ input_set_abs_params(dev, ABS_TILT_X, 0, coord.tilt_x, 0, 0);
+ input_set_abs_params(dev, ABS_TILT_Y, 0, coord.tilt_y, 0, 0);
+
+ /* start the stream */
+ if (serio_write(w8001->serio, '1'))
+ return -EIO;
+
+ return 0;
+}
+
+/*
+ * w8001_disconnect() is the opposite of w8001_connect()
+ */
+
+static void w8001_disconnect(struct serio *serio)
+{
+ struct w8001 *w8001 = serio_get_drvdata(serio);
+
+ input_get_device(w8001->dev);
+ input_unregister_device(w8001->dev);
+ serio_close(serio);
+ serio_set_drvdata(serio, NULL);
+ input_put_device(w8001->dev);
+ kfree(w8001);
+}
+
+/*
+ * w8001_connect() is the routine that is called when someone adds a
+ * new serio device that supports the w8001 protocol and registers it as
+ * an input device.
+ */
+
+static int w8001_connect(struct serio *serio, struct serio_driver *drv)
+{
+ struct w8001 *w8001;
+ struct input_dev *input_dev;
+ int err;
+
+ w8001 = kzalloc(sizeof(struct w8001), GFP_KERNEL);
+ input_dev = input_allocate_device();
+ if (!w8001 || !input_dev) {
+ err = -ENOMEM;
+ goto fail1;
+ }
+
+ w8001->serio = serio;
+ w8001->id = serio->id.id;
+ w8001->dev = input_dev;
+ init_completion(&w8001->cmd_done);
+ snprintf(w8001->phys, sizeof(w8001->phys), "%s/input0", serio->phys);
+
+ input_dev->name = "Wacom W8001 Penabled Serial TouchScreen";
+ input_dev->phys = w8001->phys;
+ input_dev->id.bustype = BUS_RS232;
+ input_dev->id.vendor = SERIO_W8001;
+ input_dev->id.product = w8001->id;
+ input_dev->id.version = 0x0100;
+ 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);
+
+ serio_set_drvdata(serio, w8001);
+ err = serio_open(serio, drv);
+ if (err)
+ goto fail2;
+
+ if (w8001_setup(w8001))
+ goto fail3;
+
+ err = input_register_device(w8001->dev);
+ if (err)
+ goto fail3;
+
+ return 0;
+
+fail3:
+ serio_close(serio);
+fail2:
+ serio_set_drvdata(serio, NULL);
+fail1:
+ input_free_device(input_dev);
+ kfree(w8001);
+ return err;
+}
+
+static struct serio_device_id w8001_serio_ids[] = {
+ {
+ .type = SERIO_RS232,
+ .proto = SERIO_W8001,
+ .id = SERIO_ANY,
+ .extra = SERIO_ANY,
+ },
+ { 0 }
+};
+
+MODULE_DEVICE_TABLE(serio, w8001_serio_ids);
+
+static struct serio_driver w8001_drv = {
+ .driver = {
+ .name = "w8001",
+ },
+ .description = DRIVER_DESC,
+ .id_table = w8001_serio_ids,
+ .interrupt = w8001_interrupt,
+ .connect = w8001_connect,
+ .disconnect = w8001_disconnect,
+};
+
+static int __init w8001_init(void)
+{
+ return serio_register_driver(&w8001_drv);
+}
+
+static void __exit w8001_exit(void)
+{
+ serio_unregister_driver(&w8001_drv);
+}
+
+module_init(w8001_init);
+module_exit(w8001_exit);
diff --git a/include/linux/serio.h b/include/linux/serio.h
index 25641d9..1bcb357 100644
--- a/include/linux/serio.h
+++ b/include/linux/serio.h
@@ -213,5 +213,6 @@ static inline void serio_unpin_driver(struct serio *serio)
#define SERIO_ZHENHUA 0x36
#define SERIO_INEXIO 0x37
#define SERIO_TOUCHIT213 0x37
+#define SERIO_W8001 0x39
#endif
--
1.5.2.3
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