diff options
Diffstat (limited to 'drivers/input/touchscreen/touchwin.c')
| -rw-r--r-- | drivers/input/touchscreen/touchwin.c | 181 |
1 files changed, 181 insertions, 0 deletions
diff --git a/drivers/input/touchscreen/touchwin.c b/drivers/input/touchscreen/touchwin.c new file mode 100644 index 000000000..bde3c6ee3 --- /dev/null +++ b/drivers/input/touchscreen/touchwin.c @@ -0,0 +1,181 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Touchwindow serial touchscreen driver + * + * Copyright (c) 2006 Rick Koch <n1gp@hotmail.com> + * + * Based on MicroTouch driver (drivers/input/touchscreen/mtouch.c) + * Copyright (c) 2004 Vojtech Pavlik + * and Dan Streetman <ddstreet@ieee.org> + */ + + +/* + * 2005/02/19 Rick Koch: + * The Touchwindow I used is made by Edmark Corp. and + * constantly outputs a stream of 0's unless it is touched. + * It then outputs 3 bytes: X, Y, and a copy of Y. + */ + +#include <linux/errno.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/input.h> +#include <linux/serio.h> + +#define DRIVER_DESC "Touchwindow serial touchscreen driver" + +MODULE_AUTHOR("Rick Koch <n1gp@hotmail.com>"); +MODULE_DESCRIPTION(DRIVER_DESC); +MODULE_LICENSE("GPL"); + +/* + * Definitions & global arrays. + */ + +#define TW_LENGTH 3 + +#define TW_MIN_XC 0 +#define TW_MAX_XC 0xff +#define TW_MIN_YC 0 +#define TW_MAX_YC 0xff + +/* + * Per-touchscreen data. + */ + +struct tw { + struct input_dev *dev; + struct serio *serio; + int idx; + int touched; + unsigned char data[TW_LENGTH]; + char phys[32]; +}; + +static irqreturn_t tw_interrupt(struct serio *serio, + unsigned char data, unsigned int flags) +{ + struct tw *tw = serio_get_drvdata(serio); + struct input_dev *dev = tw->dev; + + if (data) { /* touch */ + tw->touched = 1; + tw->data[tw->idx++] = data; + /* verify length and that the two Y's are the same */ + if (tw->idx == TW_LENGTH && tw->data[1] == tw->data[2]) { + input_report_abs(dev, ABS_X, tw->data[0]); + input_report_abs(dev, ABS_Y, tw->data[1]); + input_report_key(dev, BTN_TOUCH, 1); + input_sync(dev); + tw->idx = 0; + } + } else if (tw->touched) { /* untouch */ + input_report_key(dev, BTN_TOUCH, 0); + input_sync(dev); + tw->idx = 0; + tw->touched = 0; + } + + return IRQ_HANDLED; +} + +/* + * tw_disconnect() is the opposite of tw_connect() + */ + +static void tw_disconnect(struct serio *serio) +{ + struct tw *tw = serio_get_drvdata(serio); + + input_get_device(tw->dev); + input_unregister_device(tw->dev); + serio_close(serio); + serio_set_drvdata(serio, NULL); + input_put_device(tw->dev); + kfree(tw); +} + +/* + * tw_connect() is the routine that is called when someone adds a + * new serio device that supports the Touchwin protocol and registers it as + * an input device. + */ + +static int tw_connect(struct serio *serio, struct serio_driver *drv) +{ + struct tw *tw; + struct input_dev *input_dev; + int err; + + tw = kzalloc(sizeof(struct tw), GFP_KERNEL); + input_dev = input_allocate_device(); + if (!tw || !input_dev) { + err = -ENOMEM; + goto fail1; + } + + tw->serio = serio; + tw->dev = input_dev; + snprintf(tw->phys, sizeof(tw->phys), "%s/input0", serio->phys); + + input_dev->name = "Touchwindow Serial TouchScreen"; + input_dev->phys = tw->phys; + input_dev->id.bustype = BUS_RS232; + input_dev->id.vendor = SERIO_TOUCHWIN; + input_dev->id.product = 0; + 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); + input_set_abs_params(tw->dev, ABS_X, TW_MIN_XC, TW_MAX_XC, 0, 0); + input_set_abs_params(tw->dev, ABS_Y, TW_MIN_YC, TW_MAX_YC, 0, 0); + + serio_set_drvdata(serio, tw); + + err = serio_open(serio, drv); + if (err) + goto fail2; + + err = input_register_device(tw->dev); + if (err) + goto fail3; + + return 0; + + fail3: serio_close(serio); + fail2: serio_set_drvdata(serio, NULL); + fail1: input_free_device(input_dev); + kfree(tw); + return err; +} + +/* + * The serio driver structure. + */ + +static const struct serio_device_id tw_serio_ids[] = { + { + .type = SERIO_RS232, + .proto = SERIO_TOUCHWIN, + .id = SERIO_ANY, + .extra = SERIO_ANY, + }, + { 0 } +}; + +MODULE_DEVICE_TABLE(serio, tw_serio_ids); + +static struct serio_driver tw_drv = { + .driver = { + .name = "touchwin", + }, + .description = DRIVER_DESC, + .id_table = tw_serio_ids, + .interrupt = tw_interrupt, + .connect = tw_connect, + .disconnect = tw_disconnect, +}; + +module_serio_driver(tw_drv); |