Input: add HTC Shift Touchscreen Driver

Signed-off-by: Pau Oliva Fora <pau@eslack.org>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

4 files changed, 274 insertions, 0 deletions

diff --git a/MAINTAINERS b/MAINTAINERS
index bc1c0088dc4..5f12d73142a 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1928,6 +1928,12 @@ M:	mikulas@artax.karlin.mff.cuni.cz
 W:      http://artax.karlin.mff.cuni.cz/~mikulas/vyplody/hpfs/index-e.cgi
 S:      Maintained
 
+HTCPEN TOUCHSCREEN DRIVER
+P:      Pau Oliva Fora
+M:      pof@eslack.org
+L:      linux-input@vger.kernel.org
+S:      Maintained
+
 HUGETLB FILESYSTEM
 P:      William Irwin
 M:      wli@holomorphy.com
diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index 2cb4df0e0a7..030a8973485 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -134,6 +134,18 @@ config TOUCHSCREEN_HP7XX
           To compile this driver as a module, choose M here: the
           module will be called jornada720_ts.
 
+config TOUCHSCREEN_HTCPEN
+        tristate "HTC Shift X9500 touchscreen"
+        depends on ISA
+        help
+          Say Y here if you have an HTC Shift UMPC also known as HTC X9500
+          Clio / Shangrila and want to support the built-in touchscreen.
+
+          If unsure, say N.
+
+          To compile this driver as a module, choose M here: the
+          module will be called htcpen.
+
 config TOUCHSCREEN_PENMOUNT
         tristate "Penmount serial touchscreen"
         select SERIO
diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
index 30e86816cd4..64a11f443dc 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -17,6 +17,7 @@ obj-$(CONFIG_TOUCHSCREEN_MTOUCH)	+= mtouch.o
 obj-$(CONFIG_TOUCHSCREEN_MK712)         += mk712.o
 obj-$(CONFIG_TOUCHSCREEN_HP600)         += hp680_ts_input.o
 obj-$(CONFIG_TOUCHSCREEN_HP7XX)         += jornada720_ts.o
+obj-$(CONFIG_TOUCHSCREEN_HTCPEN)        += htcpen.o
 obj-$(CONFIG_TOUCHSCREEN_USB_COMPOSITE) += usbtouchscreen.o
 obj-$(CONFIG_TOUCHSCREEN_PENMOUNT)      += penmount.o
 obj-$(CONFIG_TOUCHSCREEN_TOUCHRIGHT)    += touchright.o
diff --git a/drivers/input/touchscreen/htcpen.c b/drivers/input/touchscreen/htcpen.c
new file mode 100644
index 00000000000..62811de6f18
--- /dev/null
+++ b/drivers/input/touchscreen/htcpen.c
@@ -0,0 +1,255 @@
+/*
+ * HTC Shift touchscreen driver
+ *
+ * Copyright (C) 2008 Pau Oliva Fora <pof@eslack.org>
+ *
+ * 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/input.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/init.h>
+#include <linux/irq.h>
+#include <linux/isa.h>
+#include <linux/ioport.h>
+#include <linux/dmi.h>
+
+MODULE_AUTHOR("Pau Oliva Fora <pau@eslack.org>");
+MODULE_DESCRIPTION("HTC Shift touchscreen driver");
+MODULE_LICENSE("GPL");
+
+#define HTCPEN_PORT_IRQ_CLEAR   0x068
+#define HTCPEN_PORT_INIT        0x06c
+#define HTCPEN_PORT_INDEX       0x0250
+#define HTCPEN_PORT_DATA        0x0251
+#define HTCPEN_IRQ              3
+
+#define DEVICE_ENABLE           0xa2
+#define DEVICE_DISABLE          0xa3
+
+#define X_INDEX                 3
+#define Y_INDEX                 5
+#define TOUCH_INDEX             0xb
+#define LSB_XY_INDEX            0xc
+#define X_AXIS_MAX              2040
+#define Y_AXIS_MAX              2040
+
+static int invert_x;
+module_param(invert_x, bool, 0644);
+MODULE_PARM_DESC(invert_x, "If set, X axis is inverted");
+static int invert_y;
+module_param(invert_y, bool, 0644);
+MODULE_PARM_DESC(invert_y, "If set, Y axis is inverted");
+
+static struct pnp_device_id pnp_ids[] = {
+        { .id = "PNP0cc0" },
+        { .id = "" }
+};
+MODULE_DEVICE_TABLE(pnp, pnp_ids);
+
+static irqreturn_t htcpen_interrupt(int irq, void *handle)
+{
+        struct input_dev *htcpen_dev = handle;
+        unsigned short x, y, xy;
+
+        /* 0 = press; 1 = release */
+        outb_p(TOUCH_INDEX, HTCPEN_PORT_INDEX);
+
+        if (inb_p(HTCPEN_PORT_DATA)) {
+                input_report_key(htcpen_dev, BTN_TOUCH, 0);
+        } else {
+                outb_p(X_INDEX, HTCPEN_PORT_INDEX);
+                x = inb_p(HTCPEN_PORT_DATA);
+
+                outb_p(Y_INDEX, HTCPEN_PORT_INDEX);
+                y = inb_p(HTCPEN_PORT_DATA);
+
+                outb_p(LSB_XY_INDEX, HTCPEN_PORT_INDEX);
+                xy = inb_p(HTCPEN_PORT_DATA);
+
+                /* get high resolution value of X and Y using LSB */
+                x = X_AXIS_MAX - ((x * 8) + ((xy >> 4) & 0xf));
+                y = (y * 8) + (xy & 0xf);
+                if (invert_x)
+                        x = X_AXIS_MAX - x;
+                if (invert_y)
+                        y = Y_AXIS_MAX - y;
+
+                if (x != X_AXIS_MAX && x != 0) {
+                        input_report_key(htcpen_dev, BTN_TOUCH, 1);
+                        input_report_abs(htcpen_dev, ABS_X, x);
+                        input_report_abs(htcpen_dev, ABS_Y, y);
+                }
+        }
+
+        input_sync(htcpen_dev);
+
+        inb_p(HTCPEN_PORT_IRQ_CLEAR);
+
+        return IRQ_HANDLED;
+}
+
+static int htcpen_open(struct input_dev *dev)
+{
+        outb_p(DEVICE_ENABLE, HTCPEN_PORT_INIT);
+
+        return 0;
+}
+
+static void htcpen_close(struct input_dev *dev)
+{
+        outb_p(DEVICE_DISABLE, HTCPEN_PORT_INIT);
+        synchronize_irq(HTCPEN_IRQ);
+}
+
+static int __devinit htcpen_isa_probe(struct device *dev, unsigned int id)
+{
+        struct input_dev *htcpen_dev;
+        int err = -EBUSY;
+
+        if (!request_region(HTCPEN_PORT_IRQ_CLEAR, 1, "htcpen")) {
+                printk(KERN_ERR "htcpen: unable to get IO region 0x%x\n",
+                        HTCPEN_PORT_IRQ_CLEAR);
+                goto request_region1_failed;
+        }
+
+        if (!request_region(HTCPEN_PORT_INIT, 1, "htcpen")) {
+                printk(KERN_ERR "htcpen: unable to get IO region 0x%x\n",
+                        HTCPEN_PORT_INIT);
+                goto request_region2_failed;
+        }
+
+        if (!request_region(HTCPEN_PORT_INDEX, 2, "htcpen")) {
+                printk(KERN_ERR "htcpen: unable to get IO region 0x%x\n",
+                        HTCPEN_PORT_INDEX);
+                goto request_region3_failed;
+        }
+
+        htcpen_dev = input_allocate_device();
+        if (!htcpen_dev) {
+                printk(KERN_ERR "htcpen: can't allocate device\n");
+                err = -ENOMEM;
+                goto input_alloc_failed;
+        }
+
+        htcpen_dev->name = "HTC Shift EC TouchScreen";
+        htcpen_dev->id.bustype = BUS_ISA;
+
+        htcpen_dev->evbit[0] = BIT_MASK(EV_ABS) | BIT_MASK(EV_KEY);
+        htcpen_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
+        input_set_abs_params(htcpen_dev, ABS_X, 0, X_AXIS_MAX, 0, 0);
+        input_set_abs_params(htcpen_dev, ABS_Y, 0, Y_AXIS_MAX, 0, 0);
+
+        htcpen_dev->open = htcpen_open;
+        htcpen_dev->close = htcpen_close;
+
+        err = request_irq(HTCPEN_IRQ, htcpen_interrupt, 0, "htcpen",
+                        htcpen_dev);
+        if (err) {
+                printk(KERN_ERR "htcpen: irq busy\n");
+                goto request_irq_failed;
+        }
+
+        inb_p(HTCPEN_PORT_IRQ_CLEAR);
+
+        err = input_register_device(htcpen_dev);
+        if (err)
+                goto input_register_failed;
+
+        dev_set_drvdata(dev, htcpen_dev);
+
+        return 0;
+
+ input_register_failed:
+        free_irq(HTCPEN_IRQ, htcpen_dev);
+ request_irq_failed:
+        input_free_device(htcpen_dev);
+ input_alloc_failed:
+        release_region(HTCPEN_PORT_INDEX, 2);
+ request_region3_failed:
+        release_region(HTCPEN_PORT_INIT, 1);
+ request_region2_failed:
+        release_region(HTCPEN_PORT_IRQ_CLEAR, 1);
+ request_region1_failed:
+        return err;
+}
+
+static int __devexit htcpen_isa_remove(struct device *dev, unsigned int id)
+{
+        struct input_dev *htcpen_dev = dev_get_drvdata(dev);
+
+        input_unregister_device(htcpen_dev);
+
+        free_irq(HTCPEN_IRQ, htcpen_dev);
+
+        release_region(HTCPEN_PORT_INDEX, 2);
+        release_region(HTCPEN_PORT_INIT, 1);
+        release_region(HTCPEN_PORT_IRQ_CLEAR, 1);
+
+        dev_set_drvdata(dev, NULL);
+
+        return 0;
+}
+
+#ifdef CONFIG_PM
+static int htcpen_isa_suspend(struct device *dev, unsigned int n,
+                                pm_message_t state)
+{
+        outb_p(DEVICE_DISABLE, HTCPEN_PORT_INIT);
+
+        return 0;
+}
+
+static int htcpen_isa_resume(struct device *dev, unsigned int n)
+{
+        outb_p(DEVICE_ENABLE, HTCPEN_PORT_INIT);
+
+        return 0;
+}
+#endif
+
+static struct isa_driver htcpen_isa_driver = {
+        .probe          = htcpen_isa_probe,
+        .remove         = __devexit_p(htcpen_isa_remove),
+#ifdef CONFIG_PM
+        .suspend        = htcpen_isa_suspend,
+        .resume         = htcpen_isa_resume,
+#endif
+        .driver = {
+                .owner  = THIS_MODULE,
+                .name   = "htcpen",
+        }
+};
+
+static struct dmi_system_id __initdata htcshift_dmi_table[] = {
+        {
+                .ident = "Shift",
+                .matches = {
+                        DMI_MATCH(DMI_SYS_VENDOR, "High Tech Computer Corp"),
+                        DMI_MATCH(DMI_PRODUCT_NAME, "Shift"),
+                },
+        },
+        { }
+};
+
+static int __init htcpen_isa_init(void)
+{
+        if (!dmi_check_system(htcshift_dmi_table))
+                return -ENODEV;
+
+        return isa_register_driver(&htcpen_isa_driver, 1);
+}
+
+static void __exit htcpen_isa_exit(void)
+{
+        isa_unregister_driver(&htcpen_isa_driver);
+}
+
+module_init(htcpen_isa_init);
+module_exit(htcpen_isa_exit);