I've written an input driver for the Liyitec PS/2 touch panel. The
patch follows. As this is my first input driver, I'd appreciate any
feedback.
Please cc me in your reply. Cheers,
Shaun
2006-01-31 Shaun Jackman <[email protected]>
* drivers/input/touchscreen/Kconfig (TOUCHSCREEN_LIYITEC): New item.
* drivers/input/touchscreen/Makefile: Add liyitec driver.
* drivers/input/touchscreen/liyitec.c: New file.
* include/linux/serio.h (SERIO_LIYITEC): New constant.
--- linux-2.6.15.orig/drivers/input/touchscreen/Kconfig 2006-01-02
20:21:10.000000000 -0700
+++ linux-2.6.15/drivers/input/touchscreen/Kconfig 2006-01-31
15:56:36.000000000 -0700
@@ -60,6 +60,19 @@
To compile this driver as a module, choose M here: the
module will be called elo.
+config TOUCHSCREEN_LIYITEC
+ tristate "Lyitec PS/2 touchscreen"
+ select SERIO
+ select SERIO_I8042 if X86_PC
+ help
+ Say Y here if you have a Liyitec PS/2 touchscreen connected to
+ your system.
+
+ If unsure, say N.
+
+ To compile this driver as a module, choose M here: the
+ module will be called liyitec.
+
config TOUCHSCREEN_MTOUCH
tristate "MicroTouch serial touchscreens"
select SERIO
--- linux-2.6.15.orig/drivers/input/touchscreen/Makefile 2006-01-02
20:21:10.000000000 -0700
+++ linux-2.6.15/drivers/input/touchscreen/Makefile 2006-01-27
16:01:39.000000000 -0700
@@ -8,6 +8,7 @@
obj-$(CONFIG_TOUCHSCREEN_CORGI) += corgi_ts.o
obj-$(CONFIG_TOUCHSCREEN_GUNZE) += gunze.o
obj-$(CONFIG_TOUCHSCREEN_ELO) += elo.o
+obj-$(CONFIG_TOUCHSCREEN_LIYITEC) += liyitec.o
obj-$(CONFIG_TOUCHSCREEN_MTOUCH) += mtouch.o
obj-$(CONFIG_TOUCHSCREEN_MK712) += mk712.o
obj-$(CONFIG_TOUCHSCREEN_HP600) += hp680_ts_input.o
--- linux-2.6.15.orig/drivers/input/touchscreen/liyitec.c 1969-12-31
17:00:00.000000000 -0700
+++ linux-2.6.15/drivers/input/touchscreen/liyitec.c 2006-01-31
15:06:49.000000000 -0700
@@ -0,0 +1,188 @@
+/* Liyitec PS/2 touch panel driver
+ * Written by Shaun Jackman <[email protected]>.
+ * Copyright 2006 Pathway Connectivity
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ *
+ * This driver was derived from mtouch.c.
+ */
+
+#include <linux/init.h>
+#include <linux/input.h>
+#include <linux/module.h>
+#include <linux/serio.h>
+
+#define DRIVER_DESC "Liyitec PS/2 touch panel driver"
+
+MODULE_AUTHOR("Shaun Jackman <[email protected]>");
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");
+
+#define LIYITEC_MAX_X 0x3ff
+#define LIYITEC_MAX_Y 0x3ff
+
+#define LIYITEC_Y9 0x80
+#define LIYITEC_X9 0x40
+#define LIYITEC_Y8 0x20
+#define LIYITEC_X8 0x10
+#define LIYITEC_SYNC 0x08
+#define LIYITEC_ABS 0x04
+#define LIYITEC_RIGHT 0x02
+#define LIYITEC_TOUCH 0x01
+
+#define LIYITEC_PACKET_SIZE 3
+#define LIYITEC_CMD_ENABLE 0xf4
+#define LIYITEC_CMD_SETSTREAM 0xea
+#define LIYITEC_RET_ACK 0xfa
+
+struct liyitec {
+ struct input_dev *dev;
+ struct serio *serio;
+ char phys[32];
+ signed char count;
+ unsigned char data[LIYITEC_PACKET_SIZE];
+};
+
+static irqreturn_t liyitec_interrupt(struct serio *serio,
+ unsigned char data, unsigned int flags, struct pt_regs *regs)
+{
+ struct liyitec *liyitec = serio_get_drvdata(serio);
+
+ if (liyitec->count < 0) {
+ if (data != LIYITEC_RET_ACK)
+ printk(KERN_DEBUG "liyitec: expected ACK: 0x%02x\n", data);
+ } else
+ liyitec->data[liyitec->count] = data;
+ liyitec->count++;
+
+ if (liyitec->count == 1 && !(data & LIYITEC_SYNC)) {
+ printk(KERN_DEBUG "liyitec: unsynchronized data: 0x%02x\n", data);
+ liyitec->count = 0;
+ }
+ else if (liyitec->count == LIYITEC_PACKET_SIZE) {
+ struct input_dev *dev = liyitec->dev;
+ input_regs(dev, regs);
+ if (liyitec->data[0] & LIYITEC_ABS) {
+ unsigned x = liyitec->data[1] +
+ (liyitec->data[0] & LIYITEC_X8 ? 0x100 : 0) +
+ (liyitec->data[0] & LIYITEC_X9 ? 0x200 : 0);
+ unsigned y = liyitec->data[2] +
+ (liyitec->data[0] & LIYITEC_Y8 ? 0x100 : 0) +
+ (liyitec->data[0] & LIYITEC_Y9 ? 0x200 : 0);
+ input_report_abs(dev, ABS_X, x);
+ input_report_abs(dev, ABS_Y, y);
+ printk(KERN_DEBUG "liyitec: (%d,%d)\n", x, y); //xxx
+ }
+ input_report_key(dev, BTN_TOUCH, liyitec->data[0] & LIYITEC_TOUCH);
+ input_report_key(dev, BTN_RIGHT, liyitec->data[0] & LIYITEC_RIGHT);
+ printk(KERN_DEBUG "liyitec: %02x\n", liyitec->data[0]); //xxx
+ input_sync(dev);
+ liyitec->count = 0;
+ }
+
+ return IRQ_HANDLED;
+}
+
+static int liyitec_connect(struct serio *serio, struct serio_driver *drv)
+{
+ struct liyitec *liyitec;
+ struct input_dev *input_dev;
+ int retval;
+
+ liyitec = kzalloc(sizeof *liyitec, GFP_KERNEL);
+ input_dev = input_allocate_device();
+ if (liyitec == NULL || input_dev == NULL) {
+ retval = -ENOMEM;
+ goto out;
+ }
+
+ liyitec->serio = serio;
+ liyitec->dev = input_dev;
+ sprintf(liyitec->phys, "%s/input0", serio->phys);
+
+ input_dev->private = liyitec;
+ input_dev->name = "Liyitec PS/2 touch screen";
+ input_dev->phys = liyitec->phys;
+ input_dev->id.bustype = BUS_I8042;
+ input_dev->id.vendor = SERIO_LIYITEC;
+ input_dev->id.product = 0;
+ input_dev->id.version = 0x0100;
+ input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
+ input_dev->keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);
+ input_dev->keybit[LONG(BTN_MOUSE)] = BIT(BTN_RIGHT);
+ input_set_abs_params(liyitec->dev, ABS_X, 0, LIYITEC_MAX_X, 0, 0);
+ input_set_abs_params(liyitec->dev, ABS_Y, 0, LIYITEC_MAX_Y, 0, 0);
+
+ serio_set_drvdata(serio, liyitec);
+ retval = serio_open(serio, drv);
+ if (retval)
+ goto out;
+ input_register_device(liyitec->dev);
+
+ liyitec->count = -2;
+ retval = serio_write(serio, LIYITEC_CMD_SETSTREAM);
+ if (retval)
+ goto out;
+ retval = serio_write(serio, LIYITEC_CMD_ENABLE);
+
+out:
+ if (retval) {
+ serio_set_drvdata(serio, NULL);
+ input_free_device(input_dev);
+ kfree(liyitec);
+ }
+ return retval;
+}
+
+static void liyitec_disconnect(struct serio *serio)
+{
+ struct liyitec *liyitec = serio_get_drvdata(serio);
+
+ input_get_device(liyitec->dev);
+ input_unregister_device(liyitec->dev);
+ serio_close(serio);
+ serio_set_drvdata(serio, NULL);
+ input_put_device(liyitec->dev);
+ kfree(liyitec);
+}
+
+static struct serio_device_id liyitec_serio_ids[] = {
+ {
+ .type = SERIO_8042,
+ .proto = SERIO_ANY,
+ .id = SERIO_ANY,
+ .extra = SERIO_ANY,
+ },
+ { 0 }
+};
+
+MODULE_DEVICE_TABLE(serio, liyitec_serio_ids);
+
+static struct serio_driver liyitec_drv = {
+ .driver = {
+ .name = "liyitec",
+ },
+ .description = DRIVER_DESC,
+ .id_table = liyitec_serio_ids,
+ .interrupt = liyitec_interrupt,
+ .connect = liyitec_connect,
+ .disconnect = liyitec_disconnect,
+};
+
+static int __init liyitec_init(void)
+{
+ printk(KERN_INFO "liyitec: %s\n", DRIVER_DESC);
+ serio_register_driver(&liyitec_drv);
+ return 0;
+}
+
+static void __exit liyitec_exit(void)
+{
+ printk(KERN_INFO "liyitec: %s\n", __func__);
+ serio_unregister_driver(&liyitec_drv);
+}
+
+module_init(liyitec_init);
+module_exit(liyitec_exit);
--- linux-2.6.15.orig/include/linux/serio.h 2006-01-02 20:21:10.000000000 -0700
+++ linux-2.6.15/include/linux/serio.h 2006-01-27 16:57:57.000000000 -0700
@@ -216,5 +216,6 @@
#define SERIO_LKKBD 0x28
#define SERIO_ELO 0x29
#define SERIO_MICROTOUCH 0x30
+#define SERIO_LIYITEC 0x31
#endif
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
