--- /dev/null
+/*
+ * 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@gmail.com>");
+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
+
+#define W8001_QUERY_PACKET 0x20
+
+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 mutex cmd_mutex;
+ struct completion cmd_done;
+ int id;
+ int idx;
+ unsigned char expected_packet;
+ 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_sync(dev);
+ break;
+ case 10:
+ w8001->idx = 0;
+ memcpy(w8001->response, &w8001->data, W8001_PACKET_LEN);
+ w8001->expected_packet = W8001_QUERY_PACKET;
+ 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_async_command(struct w8001 *w8001, unsigned char *packet,
+ int len)
+{
+ int rc = -1;
+ int i;
+
+ mutex_lock(&w8001->cmd_mutex);
+
+ for (i = 0; i < len; i++) {
+ if (serio_write(w8001->serio, packet[i]))
+ goto out;
+ }
+ rc = 0;
+
+out:
+ mutex_unlock(&w8001->cmd_mutex);
+ return rc;
+}
+
+static int w8001_command(struct w8001 *w8001, unsigned char *packet, int len)
+{
+ int rc = -1;
+ int i;
+
+ mutex_lock(&w8001->cmd_mutex);
+
+ serio_pause_rx(w8001->serio);
+ init_completion(&w8001->cmd_done);
+ serio_continue_rx(w8001->serio);
+
+ for (i = 0; i < len; i++) {
+ if (serio_write(w8001->serio, packet[i]))
+ goto out;
+ }
+
+ wait_for_completion_timeout(&w8001->cmd_done, HZ);
+
+ if (w8001->expected_packet == W8001_QUERY_PACKET) {
+ /* We are back in reporting mode, the query was ACKed */
+ memcpy(packet, w8001->response, W8001_PACKET_LEN);
+ rc = 0;
+ }
+
+out:
+ mutex_unlock(&w8001->cmd_mutex);
+ return rc;
+}
+
+static int w8001_setup(struct w8001 *w8001)
+{
+ struct w8001_coord coord;
+ struct input_dev *dev = w8001->dev;
+ unsigned char start[1] = { '1' };
+ unsigned char query[11] = { '*' };
+
+ if (w8001_command(w8001, query, 1))
+ return -1;
+
+ 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);
+
+ if (w8001_async_command(w8001, start, 1))
+ return -1;
+
+ 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;
+ mutex_init(&w8001->cmd_mutex);
+ 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);
projects / linux-2.6-omap-h63xx.git / commitdiff