326 lines
6.9 KiB
C
326 lines
6.9 KiB
C
/*
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* Wacom W8001 penabled serial touchscreen driver
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*
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* Copyright (c) 2008 Jaya Kumar
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of this archive for
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* more details.
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*
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* Layout based on Elo serial touchscreen driver by Vojtech Pavlik
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*/
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/input.h>
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#include <linux/serio.h>
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#include <linux/init.h>
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#include <linux/ctype.h>
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#define DRIVER_DESC "Wacom W8001 serial touchscreen driver"
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MODULE_AUTHOR("Jaya Kumar <jayakumar.lkml@gmail.com>");
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MODULE_DESCRIPTION(DRIVER_DESC);
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MODULE_LICENSE("GPL");
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/*
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* Definitions & global arrays.
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*/
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#define W8001_MAX_LENGTH 11
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#define W8001_PACKET_LEN 11
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#define W8001_LEAD_MASK 0x80
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#define W8001_LEAD_BYTE 0x80
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#define W8001_TAB_MASK 0x40
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#define W8001_TAB_BYTE 0x40
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#define W8001_QUERY_PACKET 0x20
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struct w8001_coord {
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u8 rdy;
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u8 tsw;
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u8 f1;
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u8 f2;
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u16 x;
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u16 y;
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u16 pen_pressure;
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u8 tilt_x;
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u8 tilt_y;
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};
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/*
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* Per-touchscreen data.
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*/
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struct w8001 {
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struct input_dev *dev;
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struct serio *serio;
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struct mutex cmd_mutex;
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struct completion cmd_done;
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int id;
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int idx;
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unsigned char expected_packet;
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unsigned char data[W8001_MAX_LENGTH];
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unsigned char response[W8001_PACKET_LEN];
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char phys[32];
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};
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static int parse_data(u8 *data, struct w8001_coord *coord)
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{
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coord->rdy = data[0] & 0x20;
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coord->tsw = data[0] & 0x01;
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coord->f1 = data[0] & 0x02;
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coord->f2 = data[0] & 0x04;
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coord->x = (data[1] & 0x7F) << 9;
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coord->x |= (data[2] & 0x7F) << 2;
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coord->x |= (data[6] & 0x60) >> 5;
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coord->y = (data[3] & 0x7F) << 9;
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coord->y |= (data[4] & 0x7F) << 2;
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coord->y |= (data[6] & 0x18) >> 3;
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coord->pen_pressure = data[5] & 0x7F;
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coord->pen_pressure |= (data[6] & 0x07) << 7 ;
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coord->tilt_x = data[7] & 0x7F;
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coord->tilt_y = data[8] & 0x7F;
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return 0;
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}
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static void w8001_process_data(struct w8001 *w8001, unsigned char data)
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{
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struct input_dev *dev = w8001->dev;
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u8 tmp;
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struct w8001_coord coord;
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w8001->data[w8001->idx] = data;
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switch (w8001->idx++) {
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case 0:
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if ((data & W8001_LEAD_MASK) != W8001_LEAD_BYTE) {
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pr_debug("w8001: unsynchronized data: 0x%02x\n", data);
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w8001->idx = 0;
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}
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break;
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case 8:
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tmp = w8001->data[0] & W8001_TAB_MASK;
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if (unlikely(tmp == W8001_TAB_BYTE))
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break;
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w8001->idx = 0;
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memset(&coord, 0, sizeof(coord));
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parse_data(w8001->data, &coord);
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input_report_abs(dev, ABS_X, coord.x);
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input_report_abs(dev, ABS_Y, coord.y);
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input_report_abs(dev, ABS_PRESSURE, coord.pen_pressure);
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input_report_key(dev, BTN_TOUCH, coord.tsw);
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input_sync(dev);
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break;
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case 10:
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w8001->idx = 0;
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memcpy(w8001->response, &w8001->data, W8001_PACKET_LEN);
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w8001->expected_packet = W8001_QUERY_PACKET;
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complete(&w8001->cmd_done);
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break;
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}
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}
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static irqreturn_t w8001_interrupt(struct serio *serio,
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unsigned char data, unsigned int flags)
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{
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struct w8001 *w8001 = serio_get_drvdata(serio);
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w8001_process_data(w8001, data);
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return IRQ_HANDLED;
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}
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static int w8001_async_command(struct w8001 *w8001, unsigned char *packet,
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int len)
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{
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int rc = -1;
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int i;
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mutex_lock(&w8001->cmd_mutex);
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for (i = 0; i < len; i++) {
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if (serio_write(w8001->serio, packet[i]))
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goto out;
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}
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rc = 0;
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out:
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mutex_unlock(&w8001->cmd_mutex);
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return rc;
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}
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static int w8001_command(struct w8001 *w8001, unsigned char *packet, int len)
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{
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int rc = -1;
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int i;
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mutex_lock(&w8001->cmd_mutex);
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serio_pause_rx(w8001->serio);
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init_completion(&w8001->cmd_done);
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serio_continue_rx(w8001->serio);
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for (i = 0; i < len; i++) {
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if (serio_write(w8001->serio, packet[i]))
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goto out;
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}
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wait_for_completion_timeout(&w8001->cmd_done, HZ);
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if (w8001->expected_packet == W8001_QUERY_PACKET) {
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/* We are back in reporting mode, the query was ACKed */
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memcpy(packet, w8001->response, W8001_PACKET_LEN);
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rc = 0;
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}
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out:
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mutex_unlock(&w8001->cmd_mutex);
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return rc;
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}
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static int w8001_setup(struct w8001 *w8001)
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{
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struct w8001_coord coord;
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struct input_dev *dev = w8001->dev;
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unsigned char start[1] = { '1' };
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unsigned char query[11] = { '*' };
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if (w8001_command(w8001, query, 1))
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return -1;
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memset(&coord, 0, sizeof(coord));
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parse_data(query, &coord);
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input_set_abs_params(dev, ABS_X, 0, coord.x, 0, 0);
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input_set_abs_params(dev, ABS_Y, 0, coord.y, 0, 0);
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input_set_abs_params(dev, ABS_PRESSURE, 0, coord.pen_pressure, 0, 0);
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input_set_abs_params(dev, ABS_TILT_X, 0, coord.tilt_x, 0, 0);
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input_set_abs_params(dev, ABS_TILT_Y, 0, coord.tilt_y, 0, 0);
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if (w8001_async_command(w8001, start, 1))
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return -1;
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return 0;
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}
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/*
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* w8001_disconnect() is the opposite of w8001_connect()
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*/
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static void w8001_disconnect(struct serio *serio)
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{
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struct w8001 *w8001 = serio_get_drvdata(serio);
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input_get_device(w8001->dev);
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input_unregister_device(w8001->dev);
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serio_close(serio);
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serio_set_drvdata(serio, NULL);
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input_put_device(w8001->dev);
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kfree(w8001);
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}
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/*
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* w8001_connect() is the routine that is called when someone adds a
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* new serio device that supports the w8001 protocol and registers it as
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* an input device.
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*/
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static int w8001_connect(struct serio *serio, struct serio_driver *drv)
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{
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struct w8001 *w8001;
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struct input_dev *input_dev;
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int err;
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w8001 = kzalloc(sizeof(struct w8001), GFP_KERNEL);
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input_dev = input_allocate_device();
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if (!w8001 || !input_dev) {
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err = -ENOMEM;
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goto fail1;
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}
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w8001->serio = serio;
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w8001->id = serio->id.id;
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w8001->dev = input_dev;
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mutex_init(&w8001->cmd_mutex);
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init_completion(&w8001->cmd_done);
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snprintf(w8001->phys, sizeof(w8001->phys), "%s/input0", serio->phys);
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input_dev->name = "Wacom W8001 Penabled Serial TouchScreen";
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input_dev->phys = w8001->phys;
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input_dev->id.bustype = BUS_RS232;
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input_dev->id.vendor = SERIO_W8001;
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input_dev->id.product = w8001->id;
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input_dev->id.version = 0x0100;
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input_dev->dev.parent = &serio->dev;
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input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
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input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
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serio_set_drvdata(serio, w8001);
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err = serio_open(serio, drv);
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if (err)
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goto fail2;
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if (w8001_setup(w8001))
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goto fail3;
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err = input_register_device(w8001->dev);
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if (err)
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goto fail3;
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return 0;
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fail3:
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serio_close(serio);
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fail2:
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serio_set_drvdata(serio, NULL);
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fail1:
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input_free_device(input_dev);
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kfree(w8001);
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return err;
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}
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static struct serio_device_id w8001_serio_ids[] = {
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{
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.type = SERIO_RS232,
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.proto = SERIO_W8001,
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.id = SERIO_ANY,
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.extra = SERIO_ANY,
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},
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{ 0 }
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};
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MODULE_DEVICE_TABLE(serio, w8001_serio_ids);
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static struct serio_driver w8001_drv = {
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.driver = {
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.name = "w8001",
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},
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.description = DRIVER_DESC,
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.id_table = w8001_serio_ids,
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.interrupt = w8001_interrupt,
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.connect = w8001_connect,
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.disconnect = w8001_disconnect,
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};
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static int __init w8001_init(void)
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{
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return serio_register_driver(&w8001_drv);
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}
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static void __exit w8001_exit(void)
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{
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serio_unregister_driver(&w8001_drv);
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}
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module_init(w8001_init);
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module_exit(w8001_exit);
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