Input: add driver for Penmount serial touchscreens

Signed-off-by: Rick Koch <n1gp@hotmail.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

3 files changed, 198 insertions, 0 deletions

diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index b1b14f8d4dd6..fa038126d508 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -108,4 +108,16 @@ config TOUCHSCREEN_HP600
           To compile this driver as a module, choose M here: the
           module will be called hp680_ts_input.
 
+config TOUCHSCREEN_PENMOUNT
+        tristate "Penmount serial touchscreen"
+        select SERIO
+        help
+          Say Y here if you have a Penmount 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 penmount.
+
 endif
diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
index 5e5557c43121..72e7be8097a4 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -12,3 +12,4 @@ obj-$(CONFIG_TOUCHSCREEN_ELO)	+= elo.o
 obj-$(CONFIG_TOUCHSCREEN_MTOUCH) += mtouch.o
 obj-$(CONFIG_TOUCHSCREEN_MK712) += mk712.o
 obj-$(CONFIG_TOUCHSCREEN_HP600) += hp680_ts_input.o
+obj-$(CONFIG_TOUCHSCREEN_PENMOUNT)      += penmount.o
diff --git a/drivers/input/touchscreen/penmount.c b/drivers/input/touchscreen/penmount.c
new file mode 100644
index 000000000000..f7370109d43e
--- /dev/null
+++ b/drivers/input/touchscreen/penmount.c
@@ -0,0 +1,185 @@
+/*
+ * Penmount serial touchscreen driver
+ *
+ * Copyright (c) 2006 Rick Koch <n1gp@hotmail.com>
+ *
+ * Based on ELO driver (drivers/input/touchscreen/elo.c)
+ * Copyright (c) 2004 Vojtech Pavlik
+ */
+
+/*
+ * 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.
+ */
+
+#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>
+
+#define DRIVER_DESC     "Penmount serial touchscreen driver"
+
+MODULE_AUTHOR("Rick Koch <n1gp@hotmail.com>");
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");
+
+/*
+ * Definitions & global arrays.
+ */
+
+#define PM_MAX_LENGTH   5
+
+/*
+ * Per-touchscreen data.
+ */
+
+struct pm {
+        struct input_dev *dev;
+        struct serio *serio;
+        int idx;
+        unsigned char data[PM_MAX_LENGTH];
+        char phys[32];
+};
+
+static irqreturn_t pm_interrupt(struct serio *serio,
+                unsigned char data, unsigned int flags, struct pt_regs *regs)
+{
+        struct pm *pm = serio_get_drvdata(serio);
+        struct input_dev *dev = pm->dev;
+
+        pm->data[pm->idx] = data;
+
+        if (pm->data[0] & 0x80) {
+                if (PM_MAX_LENGTH == ++pm->idx) {
+                        input_regs(dev, regs);
+                        input_report_abs(dev, ABS_X, pm->data[2] * 128 + pm->data[1]);
+                        input_report_abs(dev, ABS_Y, pm->data[4] * 128 + pm->data[3]);
+                        input_report_key(dev, BTN_TOUCH, !!(pm->data[0] & 0x40));
+                        input_sync(dev);
+                        pm->idx = 0;
+                }
+        }
+
+        return IRQ_HANDLED;
+}
+
+/*
+ * pm_disconnect() is the opposite of pm_connect()
+ */
+
+static void pm_disconnect(struct serio *serio)
+{
+        struct pm *pm = serio_get_drvdata(serio);
+
+        input_get_device(pm->dev);
+        input_unregister_device(pm->dev);
+        serio_close(serio);
+        serio_set_drvdata(serio, NULL);
+        input_put_device(pm->dev);
+        kfree(pm);
+}
+
+/*
+ * pm_connect() is the routine that is called when someone adds a
+ * new serio device that supports Gunze protocol and registers it as
+ * an input device.
+ */
+
+static int pm_connect(struct serio *serio, struct serio_driver *drv)
+{
+        struct pm *pm;
+        struct input_dev *input_dev;
+        int err;
+
+        pm = kzalloc(sizeof(struct pm), GFP_KERNEL);
+        input_dev = input_allocate_device();
+        if (!pm || !input_dev) {
+                err = -ENOMEM;
+                goto fail1;
+        }
+
+        pm->serio = serio;
+        pm->dev = input_dev;
+        snprintf(pm->phys, sizeof(pm->phys), "%s/input0", serio->phys);
+
+        input_dev->private = pm;
+        input_dev->name = "Penmount Serial TouchScreen";
+        input_dev->phys = pm->phys;
+        input_dev->id.bustype = BUS_RS232;
+        input_dev->id.vendor = SERIO_PENMOUNT;
+        input_dev->id.product = 0;
+        input_dev->id.version = 0x0100;
+        input_dev->cdev.dev = &serio->dev;
+
+        input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
+        input_dev->keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);
+        input_set_abs_params(pm->dev, ABS_X, 0, 0x3ff, 0, 0);
+        input_set_abs_params(pm->dev, ABS_Y, 0, 0x3ff, 0, 0);
+
+        serio_set_drvdata(serio, pm);
+
+        err = serio_open(serio, drv);
+        if (err)
+                goto fail2;
+
+        err = input_register_device(pm->dev);
+        if (err)
+                goto fail3;
+
+        return 0;
+
+ fail3: serio_close(serio);
+ fail2: serio_set_drvdata(serio, NULL);
+ fail1: input_free_device(input_dev);
+        kfree(pm);
+        return err;
+}
+
+/*
+ * The serio driver structure.
+ */
+
+static struct serio_device_id pm_serio_ids[] = {
+        {
+                .type   = SERIO_RS232,
+                .proto  = SERIO_PENMOUNT,
+                .id     = SERIO_ANY,
+                .extra  = SERIO_ANY,
+        },
+        { 0 }
+};
+
+MODULE_DEVICE_TABLE(serio, pm_serio_ids);
+
+static struct serio_driver pm_drv = {
+        .driver         = {
+                .name   = "penmountlpc",
+        },
+        .description    = DRIVER_DESC,
+        .id_table       = pm_serio_ids,
+        .interrupt      = pm_interrupt,
+        .connect        = pm_connect,
+        .disconnect     = pm_disconnect,
+};
+
+/*
+ * The functions for inserting/removing us as a module.
+ */
+
+static int __init pm_init(void)
+{
+        serio_register_driver(&pm_drv);
+        return 0;
+}
+
+static void __exit pm_exit(void)
+{
+        serio_unregister_driver(&pm_drv);
+}
+
+module_init(pm_init);
+module_exit(pm_exit);