Input: add driver for Fujitsu serial touchscreens

These serial touchscreens are found on some Fujitsu lifebook
P-series laptops, and the B6210. Using this requires a new
version of inputattach and doing:

 inputattach -fjt /dev/ttyS0

Big thanks to Stephen Hemminger for testing it and making it
work on his B6210 laptop.

Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index 69371779806ac57182548230a9513e2754efd064..f929fcdbae2e75cb640dded83d2e33c33b1d8d24 100644 (file)
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -54,6 +54,19 @@ config TOUCHSCREEN_CORGI
          To compile this driver as a module, choose M here: the
          module will be called corgi_ts.
 
+config TOUCHSCREEN_FUJITSU
+       tristate "Fujitsu serial touchscreen"
+       select SERIO
+       help
+         Say Y here if you have the Fujitsu touchscreen (such as one
+         installed in Lifebook P series laptop) connected to your
+         system.
+
+         If unsure, say N.
+
+         To compile this driver as a module, choose M here: the
+         module will be called fujitsu-ts.
+
 config TOUCHSCREEN_GUNZE
        tristate "Gunze AHL-51S touchscreen"
        select SERIO

diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
index 2f86d6ad06d3a193fedcdd01b2a4dd7dbb498491..5de8933c49936ecbda73bb2da6e05c5dcb62cd41 100644 (file)
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -9,6 +9,7 @@ obj-$(CONFIG_TOUCHSCREEN_BITSY)         += h3600_ts_input.o
 obj-$(CONFIG_TOUCHSCREEN_CORGI)                += corgi_ts.o
 obj-$(CONFIG_TOUCHSCREEN_GUNZE)                += gunze.o
 obj-$(CONFIG_TOUCHSCREEN_ELO)          += elo.o
+obj-$(CONFIG_TOUCHSCREEN_FUJITSU)      += fujitsu_ts.o
 obj-$(CONFIG_TOUCHSCREEN_MTOUCH)       += mtouch.o
 obj-$(CONFIG_TOUCHSCREEN_MK712)                += mk712.o
 obj-$(CONFIG_TOUCHSCREEN_HP600)                += hp680_ts_input.o

diff --git a/drivers/input/touchscreen/fujitsu_ts.c b/drivers/input/touchscreen/fujitsu_ts.c
new file mode 100644 (file)
index 0000000..daf7a4a
--- /dev/null
+++ b/drivers/input/touchscreen/fujitsu_ts.c
@@ -0,0 +1,189 @@
+/*
+ * Fujitsu serial touchscreen driver
+ *
+ * Copyright (c) Dmitry Torokhov <dtor@mail.ru>
+ */
+
+/*
+ * 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    "Fujitsu serial touchscreen driver"
+
+MODULE_AUTHOR("Dmitry Torokhov <dtor@mail.ru>");
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");
+
+#define FUJITSU_LENGTH 5
+
+/*
+ * Per-touchscreen data.
+ */
+struct fujitsu {
+       struct input_dev *dev;
+       struct serio *serio;
+       int idx;
+       unsigned char data[FUJITSU_LENGTH];
+       char phys[32];
+};
+
+/*
+ * Decode serial data (5 bytes per packet)
+ * First byte
+ * 1 C 0 0 R S S S
+ * Where C is 1 while in calibration mode (which we don't use)
+ * R is 1 when no coordinate corection was done.
+ * S are button state
+ */
+static irqreturn_t fujitsu_interrupt(struct serio *serio,
+                                    unsigned char data, unsigned int flags)
+{
+       struct fujitsu *fujitsu = serio_get_drvdata(serio);
+       struct input_dev *dev = fujitsu->dev;
+
+       if (fujitsu->idx == 0) {
+               /* resync skip until start of frame */
+               if ((data & 0xf0) != 0x80)
+                       return IRQ_HANDLED;
+       } else {
+               /* resync skip garbage */
+               if (data & 0x80) {
+                       fujitsu->idx = 0;
+                       return IRQ_HANDLED;
+               }
+       }
+
+       fujitsu->data[fujitsu->idx++] = data;
+       if (fujitsu->idx == FUJITSU_LENGTH) {
+               input_report_abs(dev, ABS_X,
+                                (fujitsu->data[2] << 7) | fujitsu->data[1]);
+               input_report_abs(dev, ABS_Y,
+                                (fujitsu->data[4] << 7) | fujitsu->data[3]);
+               input_report_key(dev, BTN_TOUCH,
+                                (fujitsu->data[0] & 0x03) != 2);
+               input_sync(dev);
+               fujitsu->idx = 0;
+       }
+
+       return IRQ_HANDLED;
+}
+
+/*
+ * fujitsu_disconnect() is the opposite of fujitsu_connect()
+ */
+static void fujitsu_disconnect(struct serio *serio)
+{
+       struct fujitsu *fujitsu = serio_get_drvdata(serio);
+
+       input_get_device(fujitsu->dev);
+       input_unregister_device(fujitsu->dev);
+       serio_close(serio);
+       serio_set_drvdata(serio, NULL);
+       input_put_device(fujitsu->dev);
+       kfree(fujitsu);
+}
+
+/*
+ * fujitsu_connect() is the routine that is called when someone adds a
+ * new serio device that supports the Fujitsu protocol and registers it
+ * as input device.
+ */
+static int fujitsu_connect(struct serio *serio, struct serio_driver *drv)
+{
+       struct fujitsu *fujitsu;
+       struct input_dev *input_dev;
+       int err;
+
+       fujitsu = kzalloc(sizeof(struct fujitsu), GFP_KERNEL);
+       input_dev = input_allocate_device();
+       if (!fujitsu || !input_dev) {
+               err = -ENOMEM;
+               goto fail1;
+       }
+
+       fujitsu->serio = serio;
+       fujitsu->dev = input_dev;
+       snprintf(fujitsu->phys, sizeof(fujitsu->phys),
+                "%s/input0", serio->phys);
+
+       input_dev->name = "Fujitsu Serial Touchscreen";
+       input_dev->phys = fujitsu->phys;
+       input_dev->id.bustype = BUS_RS232;
+       input_dev->id.vendor = SERIO_FUJITSU;
+       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_set_abs_params(input_dev, ABS_X, 0, 4096, 0, 0);
+       input_set_abs_params(input_dev, ABS_Y, 0, 4096, 0, 0);
+       serio_set_drvdata(serio, fujitsu);
+
+       err = serio_open(serio, drv);
+       if (err)
+               goto fail2;
+
+       err = input_register_device(fujitsu->dev);
+       if (err)
+               goto fail3;
+
+       return 0;
+
+ fail3:
+       serio_close(serio);
+ fail2:
+       serio_set_drvdata(serio, NULL);
+ fail1:
+       input_free_device(input_dev);
+       kfree(fujitsu);
+       return err;
+}
+
+/*
+ * The serio driver structure.
+ */
+static struct serio_device_id fujitsu_serio_ids[] = {
+       {
+               .type   = SERIO_RS232,
+               .proto  = SERIO_FUJITSU,
+               .id     = SERIO_ANY,
+               .extra  = SERIO_ANY,
+       },
+       { 0 }
+};
+
+MODULE_DEVICE_TABLE(serio, fujitsu_serio_ids);
+
+static struct serio_driver fujitsu_drv = {
+       .driver         = {
+               .name   = "fujitsu_ts",
+       },
+       .description    = DRIVER_DESC,
+       .id_table       = fujitsu_serio_ids,
+       .interrupt      = fujitsu_interrupt,
+       .connect        = fujitsu_connect,
+       .disconnect     = fujitsu_disconnect,
+};
+
+static int __init fujitsu_init(void)
+{
+       return serio_register_driver(&fujitsu_drv);
+}
+
+static void __exit fujitsu_exit(void)
+{
+       serio_unregister_driver(&fujitsu_drv);
+}
+
+module_init(fujitsu_init);
+module_exit(fujitsu_exit);

diff --git a/include/linux/serio.h b/include/linux/serio.h
index d9377ce9ffd1739b642095a298e854dbc537718a..9f38250146744a605736879d1ba23fe969a07ad0 100644 (file)
--- a/include/linux/serio.h
+++ b/include/linux/serio.h
@@ -210,5 +210,6 @@ static inline void serio_unpin_driver(struct serio *serio)
 #define SERIO_TOUCHRIGHT       0x32
 #define SERIO_TOUCHWIN 0x33
 #define SERIO_TAOSEVM  0x34
+#define SERIO_FUJITSU  0x35
 
 #endif