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![Arvind Yadav](/assets/img/avatar_default.png)
serio_device_id are not supposed to change at runtime. All functions working with serio_device_id provided by <linux/serio.h> work with const serio_device_id. So mark the non-const structs as const. Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
707 lines
17 KiB
C
707 lines
17 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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* Copyright (c) 2010 Red Hat, Inc.
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* Copyright (c) 2010 - 2011 Ping Cheng, Wacom. <pingc@wacom.com>
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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/mt.h>
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#include <linux/serio.h>
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#include <linux/ctype.h>
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#include <linux/delay.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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#define W8001_MAX_LENGTH 13
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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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/* set in first byte of touch data packets */
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#define W8001_TOUCH_MASK (0x10 | W8001_LEAD_MASK)
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#define W8001_TOUCH_BYTE (0x10 | W8001_LEAD_BYTE)
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#define W8001_QUERY_PACKET 0x20
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#define W8001_CMD_STOP '0'
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#define W8001_CMD_START '1'
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#define W8001_CMD_QUERY '*'
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#define W8001_CMD_TOUCHQUERY '%'
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/* length of data packets in bytes, depends on device. */
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#define W8001_PKTLEN_TOUCH93 5
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#define W8001_PKTLEN_TOUCH9A 7
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#define W8001_PKTLEN_TPCPEN 9
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#define W8001_PKTLEN_TPCCTL 11 /* control packet */
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#define W8001_PKTLEN_TOUCH2FG 13
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/* resolution in points/mm */
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#define W8001_PEN_RESOLUTION 100
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#define W8001_TOUCH_RESOLUTION 10
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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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/* touch query reply packet */
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struct w8001_touch_query {
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u16 x;
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u16 y;
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u8 panel_res;
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u8 capacity_res;
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u8 sensor_id;
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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 *pen_dev;
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struct input_dev *touch_dev;
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struct serio *serio;
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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 response_type;
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unsigned char response[W8001_MAX_LENGTH];
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unsigned char data[W8001_MAX_LENGTH];
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char phys[32];
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int type;
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unsigned int pktlen;
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u16 max_touch_x;
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u16 max_touch_y;
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u16 max_pen_x;
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u16 max_pen_y;
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char pen_name[64];
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char touch_name[64];
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int open_count;
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struct mutex mutex;
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};
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static void parse_pen_data(u8 *data, struct w8001_coord *coord)
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{
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memset(coord, 0, sizeof(*coord));
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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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}
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static void parse_single_touch(u8 *data, struct w8001_coord *coord)
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{
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coord->x = (data[1] << 7) | data[2];
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coord->y = (data[3] << 7) | data[4];
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coord->tsw = data[0] & 0x01;
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}
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static void scale_touch_coordinates(struct w8001 *w8001,
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unsigned int *x, unsigned int *y)
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{
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if (w8001->max_pen_x && w8001->max_touch_x)
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*x = *x * w8001->max_pen_x / w8001->max_touch_x;
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if (w8001->max_pen_y && w8001->max_touch_y)
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*y = *y * w8001->max_pen_y / w8001->max_touch_y;
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}
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static void parse_multi_touch(struct w8001 *w8001)
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{
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struct input_dev *dev = w8001->touch_dev;
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unsigned char *data = w8001->data;
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unsigned int x, y;
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int i;
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int count = 0;
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for (i = 0; i < 2; i++) {
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bool touch = data[0] & (1 << i);
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input_mt_slot(dev, i);
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input_mt_report_slot_state(dev, MT_TOOL_FINGER, touch);
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if (touch) {
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x = (data[6 * i + 1] << 7) | data[6 * i + 2];
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y = (data[6 * i + 3] << 7) | data[6 * i + 4];
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/* data[5,6] and [11,12] is finger capacity */
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/* scale to pen maximum */
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scale_touch_coordinates(w8001, &x, &y);
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input_report_abs(dev, ABS_MT_POSITION_X, x);
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input_report_abs(dev, ABS_MT_POSITION_Y, y);
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count++;
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}
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}
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/* emulate single touch events when stylus is out of proximity.
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* This is to make single touch backward support consistent
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* across all Wacom single touch devices.
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*/
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if (w8001->type != BTN_TOOL_PEN &&
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w8001->type != BTN_TOOL_RUBBER) {
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w8001->type = count == 1 ? BTN_TOOL_FINGER : KEY_RESERVED;
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input_mt_report_pointer_emulation(dev, true);
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}
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input_sync(dev);
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}
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static void parse_touchquery(u8 *data, struct w8001_touch_query *query)
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{
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memset(query, 0, sizeof(*query));
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query->panel_res = data[1];
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query->sensor_id = data[2] & 0x7;
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query->capacity_res = data[7];
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query->x = data[3] << 9;
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query->x |= data[4] << 2;
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query->x |= (data[2] >> 5) & 0x3;
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query->y = data[5] << 9;
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query->y |= data[6] << 2;
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query->y |= (data[2] >> 3) & 0x3;
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/* Early days' single-finger touch models need the following defaults */
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if (!query->x && !query->y) {
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query->x = 1024;
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query->y = 1024;
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if (query->panel_res)
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query->x = query->y = (1 << query->panel_res);
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query->panel_res = W8001_TOUCH_RESOLUTION;
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}
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}
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static void report_pen_events(struct w8001 *w8001, struct w8001_coord *coord)
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{
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struct input_dev *dev = w8001->pen_dev;
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/*
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* We have 1 bit for proximity (rdy) and 3 bits for tip, side,
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* side2/eraser. If rdy && f2 are set, this can be either pen + side2,
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* or eraser. Assume:
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* - if dev is already in proximity and f2 is toggled → pen + side2
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* - if dev comes into proximity with f2 set → eraser
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* If f2 disappears after assuming eraser, fake proximity out for
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* eraser and in for pen.
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*/
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switch (w8001->type) {
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case BTN_TOOL_RUBBER:
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if (!coord->f2) {
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input_report_abs(dev, ABS_PRESSURE, 0);
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input_report_key(dev, BTN_TOUCH, 0);
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input_report_key(dev, BTN_STYLUS, 0);
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input_report_key(dev, BTN_STYLUS2, 0);
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input_report_key(dev, BTN_TOOL_RUBBER, 0);
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input_sync(dev);
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w8001->type = BTN_TOOL_PEN;
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}
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break;
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case BTN_TOOL_FINGER:
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case KEY_RESERVED:
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w8001->type = coord->f2 ? BTN_TOOL_RUBBER : BTN_TOOL_PEN;
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break;
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default:
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input_report_key(dev, BTN_STYLUS2, coord->f2);
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break;
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}
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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_report_key(dev, BTN_STYLUS, coord->f1);
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input_report_key(dev, w8001->type, coord->rdy);
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input_sync(dev);
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if (!coord->rdy)
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w8001->type = KEY_RESERVED;
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}
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static void report_single_touch(struct w8001 *w8001, struct w8001_coord *coord)
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{
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struct input_dev *dev = w8001->touch_dev;
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unsigned int x = coord->x;
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unsigned int y = coord->y;
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/* scale to pen maximum */
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scale_touch_coordinates(w8001, &x, &y);
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input_report_abs(dev, ABS_X, x);
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input_report_abs(dev, ABS_Y, y);
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input_report_key(dev, BTN_TOUCH, coord->tsw);
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input_sync(dev);
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w8001->type = coord->tsw ? BTN_TOOL_FINGER : KEY_RESERVED;
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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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struct w8001_coord coord;
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unsigned char tmp;
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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 W8001_PKTLEN_TOUCH93 - 1:
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case W8001_PKTLEN_TOUCH9A - 1:
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tmp = w8001->data[0] & W8001_TOUCH_BYTE;
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if (tmp != W8001_TOUCH_BYTE)
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break;
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if (w8001->pktlen == w8001->idx) {
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w8001->idx = 0;
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if (w8001->type != BTN_TOOL_PEN &&
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w8001->type != BTN_TOOL_RUBBER) {
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parse_single_touch(w8001->data, &coord);
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report_single_touch(w8001, &coord);
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}
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}
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break;
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/* Pen coordinates packet */
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case W8001_PKTLEN_TPCPEN - 1:
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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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tmp = w8001->data[0] & W8001_TOUCH_BYTE;
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if (tmp == W8001_TOUCH_BYTE)
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break;
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w8001->idx = 0;
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parse_pen_data(w8001->data, &coord);
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report_pen_events(w8001, &coord);
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break;
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/* control packet */
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case W8001_PKTLEN_TPCCTL - 1:
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tmp = w8001->data[0] & W8001_TOUCH_MASK;
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if (tmp == W8001_TOUCH_BYTE)
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break;
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w8001->idx = 0;
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memcpy(w8001->response, w8001->data, W8001_MAX_LENGTH);
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w8001->response_type = W8001_QUERY_PACKET;
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complete(&w8001->cmd_done);
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break;
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/* 2 finger touch packet */
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case W8001_PKTLEN_TOUCH2FG - 1:
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w8001->idx = 0;
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parse_multi_touch(w8001);
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break;
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default:
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/*
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* ThinkPad X60 Tablet PC (pen only device) sometimes
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* sends invalid data packets that are larger than
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* W8001_PKTLEN_TPCPEN. Let's start over again.
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*/
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if (!w8001->touch_dev && w8001->idx > W8001_PKTLEN_TPCPEN - 1)
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w8001->idx = 0;
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}
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return IRQ_HANDLED;
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}
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static int w8001_command(struct w8001 *w8001, unsigned char command,
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bool wait_response)
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{
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int rc;
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w8001->response_type = 0;
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init_completion(&w8001->cmd_done);
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rc = serio_write(w8001->serio, command);
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if (rc == 0 && wait_response) {
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wait_for_completion_timeout(&w8001->cmd_done, HZ);
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if (w8001->response_type != W8001_QUERY_PACKET)
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rc = -EIO;
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}
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return rc;
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}
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static int w8001_open(struct input_dev *dev)
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{
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struct w8001 *w8001 = input_get_drvdata(dev);
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int err;
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err = mutex_lock_interruptible(&w8001->mutex);
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if (err)
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return err;
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if (w8001->open_count++ == 0) {
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err = w8001_command(w8001, W8001_CMD_START, false);
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if (err)
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w8001->open_count--;
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}
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mutex_unlock(&w8001->mutex);
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return err;
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}
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static void w8001_close(struct input_dev *dev)
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{
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struct w8001 *w8001 = input_get_drvdata(dev);
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mutex_lock(&w8001->mutex);
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if (--w8001->open_count == 0)
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w8001_command(w8001, W8001_CMD_STOP, false);
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mutex_unlock(&w8001->mutex);
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}
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static int w8001_detect(struct w8001 *w8001)
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{
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int error;
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error = w8001_command(w8001, W8001_CMD_STOP, false);
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if (error)
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return error;
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msleep(250); /* wait 250ms before querying the device */
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return 0;
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}
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static int w8001_setup_pen(struct w8001 *w8001, char *basename,
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size_t basename_sz)
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{
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struct input_dev *dev = w8001->pen_dev;
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struct w8001_coord coord;
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int error;
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/* penabled? */
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error = w8001_command(w8001, W8001_CMD_QUERY, true);
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if (error)
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return error;
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__set_bit(EV_KEY, dev->evbit);
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__set_bit(EV_ABS, dev->evbit);
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__set_bit(BTN_TOUCH, dev->keybit);
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__set_bit(BTN_TOOL_PEN, dev->keybit);
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__set_bit(BTN_TOOL_RUBBER, dev->keybit);
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__set_bit(BTN_STYLUS, dev->keybit);
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__set_bit(BTN_STYLUS2, dev->keybit);
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__set_bit(INPUT_PROP_DIRECT, dev->propbit);
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parse_pen_data(w8001->response, &coord);
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w8001->max_pen_x = coord.x;
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w8001->max_pen_y = coord.y;
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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_abs_set_res(dev, ABS_X, W8001_PEN_RESOLUTION);
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input_abs_set_res(dev, ABS_Y, W8001_PEN_RESOLUTION);
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input_set_abs_params(dev, ABS_PRESSURE, 0, coord.pen_pressure, 0, 0);
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if (coord.tilt_x && coord.tilt_y) {
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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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}
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w8001->id = 0x90;
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strlcat(basename, " Penabled", basename_sz);
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return 0;
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}
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static int w8001_setup_touch(struct w8001 *w8001, char *basename,
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size_t basename_sz)
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{
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struct input_dev *dev = w8001->touch_dev;
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struct w8001_touch_query touch;
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int error;
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/* Touch enabled? */
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error = w8001_command(w8001, W8001_CMD_TOUCHQUERY, true);
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if (error)
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return error;
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/*
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* Some non-touch devices may reply to the touch query. But their
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* second byte is empty, which indicates touch is not supported.
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*/
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if (!w8001->response[1])
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return -ENXIO;
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__set_bit(EV_KEY, dev->evbit);
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__set_bit(EV_ABS, dev->evbit);
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__set_bit(BTN_TOUCH, dev->keybit);
|
|
__set_bit(INPUT_PROP_DIRECT, dev->propbit);
|
|
|
|
parse_touchquery(w8001->response, &touch);
|
|
w8001->max_touch_x = touch.x;
|
|
w8001->max_touch_y = touch.y;
|
|
|
|
if (w8001->max_pen_x && w8001->max_pen_y) {
|
|
/* if pen is supported scale to pen maximum */
|
|
touch.x = w8001->max_pen_x;
|
|
touch.y = w8001->max_pen_y;
|
|
touch.panel_res = W8001_PEN_RESOLUTION;
|
|
}
|
|
|
|
input_set_abs_params(dev, ABS_X, 0, touch.x, 0, 0);
|
|
input_set_abs_params(dev, ABS_Y, 0, touch.y, 0, 0);
|
|
input_abs_set_res(dev, ABS_X, touch.panel_res);
|
|
input_abs_set_res(dev, ABS_Y, touch.panel_res);
|
|
|
|
switch (touch.sensor_id) {
|
|
case 0:
|
|
case 2:
|
|
w8001->pktlen = W8001_PKTLEN_TOUCH93;
|
|
w8001->id = 0x93;
|
|
strlcat(basename, " 1FG", basename_sz);
|
|
break;
|
|
|
|
case 1:
|
|
case 3:
|
|
case 4:
|
|
w8001->pktlen = W8001_PKTLEN_TOUCH9A;
|
|
strlcat(basename, " 1FG", basename_sz);
|
|
w8001->id = 0x9a;
|
|
break;
|
|
|
|
case 5:
|
|
w8001->pktlen = W8001_PKTLEN_TOUCH2FG;
|
|
|
|
__set_bit(BTN_TOOL_DOUBLETAP, dev->keybit);
|
|
error = input_mt_init_slots(dev, 2, 0);
|
|
if (error) {
|
|
dev_err(&w8001->serio->dev,
|
|
"failed to initialize MT slots: %d\n", error);
|
|
return error;
|
|
}
|
|
|
|
input_set_abs_params(dev, ABS_MT_POSITION_X,
|
|
0, touch.x, 0, 0);
|
|
input_set_abs_params(dev, ABS_MT_POSITION_Y,
|
|
0, touch.y, 0, 0);
|
|
input_set_abs_params(dev, ABS_MT_TOOL_TYPE,
|
|
0, MT_TOOL_MAX, 0, 0);
|
|
input_abs_set_res(dev, ABS_MT_POSITION_X, touch.panel_res);
|
|
input_abs_set_res(dev, ABS_MT_POSITION_Y, touch.panel_res);
|
|
|
|
strlcat(basename, " 2FG", basename_sz);
|
|
if (w8001->max_pen_x && w8001->max_pen_y)
|
|
w8001->id = 0xE3;
|
|
else
|
|
w8001->id = 0xE2;
|
|
break;
|
|
}
|
|
|
|
strlcat(basename, " Touchscreen", basename_sz);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void w8001_set_devdata(struct input_dev *dev, struct w8001 *w8001,
|
|
struct serio *serio)
|
|
{
|
|
dev->phys = w8001->phys;
|
|
dev->id.bustype = BUS_RS232;
|
|
dev->id.product = w8001->id;
|
|
dev->id.vendor = 0x056a;
|
|
dev->id.version = 0x0100;
|
|
dev->open = w8001_open;
|
|
dev->close = w8001_close;
|
|
|
|
dev->dev.parent = &serio->dev;
|
|
|
|
input_set_drvdata(dev, w8001);
|
|
}
|
|
|
|
/*
|
|
* w8001_disconnect() is the opposite of w8001_connect()
|
|
*/
|
|
|
|
static void w8001_disconnect(struct serio *serio)
|
|
{
|
|
struct w8001 *w8001 = serio_get_drvdata(serio);
|
|
|
|
serio_close(serio);
|
|
|
|
if (w8001->pen_dev)
|
|
input_unregister_device(w8001->pen_dev);
|
|
if (w8001->touch_dev)
|
|
input_unregister_device(w8001->touch_dev);
|
|
kfree(w8001);
|
|
|
|
serio_set_drvdata(serio, NULL);
|
|
}
|
|
|
|
/*
|
|
* 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_pen;
|
|
struct input_dev *input_dev_touch;
|
|
char basename[64];
|
|
int err, err_pen, err_touch;
|
|
|
|
w8001 = kzalloc(sizeof(struct w8001), GFP_KERNEL);
|
|
input_dev_pen = input_allocate_device();
|
|
input_dev_touch = input_allocate_device();
|
|
if (!w8001 || !input_dev_pen || !input_dev_touch) {
|
|
err = -ENOMEM;
|
|
goto fail1;
|
|
}
|
|
|
|
w8001->serio = serio;
|
|
w8001->pen_dev = input_dev_pen;
|
|
w8001->touch_dev = input_dev_touch;
|
|
mutex_init(&w8001->mutex);
|
|
init_completion(&w8001->cmd_done);
|
|
snprintf(w8001->phys, sizeof(w8001->phys), "%s/input0", serio->phys);
|
|
|
|
serio_set_drvdata(serio, w8001);
|
|
err = serio_open(serio, drv);
|
|
if (err)
|
|
goto fail2;
|
|
|
|
err = w8001_detect(w8001);
|
|
if (err)
|
|
goto fail3;
|
|
|
|
/* For backwards-compatibility we compose the basename based on
|
|
* capabilities and then just append the tool type
|
|
*/
|
|
strlcpy(basename, "Wacom Serial", sizeof(basename));
|
|
|
|
err_pen = w8001_setup_pen(w8001, basename, sizeof(basename));
|
|
err_touch = w8001_setup_touch(w8001, basename, sizeof(basename));
|
|
if (err_pen && err_touch) {
|
|
err = -ENXIO;
|
|
goto fail3;
|
|
}
|
|
|
|
if (!err_pen) {
|
|
strlcpy(w8001->pen_name, basename, sizeof(w8001->pen_name));
|
|
strlcat(w8001->pen_name, " Pen", sizeof(w8001->pen_name));
|
|
input_dev_pen->name = w8001->pen_name;
|
|
|
|
w8001_set_devdata(input_dev_pen, w8001, serio);
|
|
|
|
err = input_register_device(w8001->pen_dev);
|
|
if (err)
|
|
goto fail3;
|
|
} else {
|
|
input_free_device(input_dev_pen);
|
|
input_dev_pen = NULL;
|
|
w8001->pen_dev = NULL;
|
|
}
|
|
|
|
if (!err_touch) {
|
|
strlcpy(w8001->touch_name, basename, sizeof(w8001->touch_name));
|
|
strlcat(w8001->touch_name, " Finger",
|
|
sizeof(w8001->touch_name));
|
|
input_dev_touch->name = w8001->touch_name;
|
|
|
|
w8001_set_devdata(input_dev_touch, w8001, serio);
|
|
|
|
err = input_register_device(w8001->touch_dev);
|
|
if (err)
|
|
goto fail4;
|
|
} else {
|
|
input_free_device(input_dev_touch);
|
|
input_dev_touch = NULL;
|
|
w8001->touch_dev = NULL;
|
|
}
|
|
|
|
return 0;
|
|
|
|
fail4:
|
|
if (w8001->pen_dev)
|
|
input_unregister_device(w8001->pen_dev);
|
|
fail3:
|
|
serio_close(serio);
|
|
fail2:
|
|
serio_set_drvdata(serio, NULL);
|
|
fail1:
|
|
input_free_device(input_dev_pen);
|
|
input_free_device(input_dev_touch);
|
|
kfree(w8001);
|
|
return err;
|
|
}
|
|
|
|
static const 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,
|
|
};
|
|
|
|
module_serio_driver(w8001_drv);
|