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200 lines
4.8 KiB
200 lines
4.8 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* MicroTouch (3M) serial touchscreen driver |
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* |
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* Copyright (c) 2004 Vojtech Pavlik |
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*/ |
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/* |
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* 2005/02/19 Dan Streetman <[email protected]> |
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* Copied elo.c and edited for MicroTouch protocol |
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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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#define DRIVER_DESC "MicroTouch serial touchscreen driver" |
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MODULE_AUTHOR("Vojtech Pavlik <[email protected]>"); |
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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 MTOUCH_FORMAT_TABLET_STATUS_BIT 0x80 |
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#define MTOUCH_FORMAT_TABLET_TOUCH_BIT 0x40 |
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#define MTOUCH_FORMAT_TABLET_LENGTH 5 |
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#define MTOUCH_RESPONSE_BEGIN_BYTE 0x01 |
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#define MTOUCH_RESPONSE_END_BYTE 0x0d |
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/* todo: check specs for max length of all responses */ |
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#define MTOUCH_MAX_LENGTH 16 |
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#define MTOUCH_MIN_XC 0 |
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#define MTOUCH_MAX_XC 0x3fff |
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#define MTOUCH_MIN_YC 0 |
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#define MTOUCH_MAX_YC 0x3fff |
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#define MTOUCH_GET_XC(data) (((data[2])<<7) | data[1]) |
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#define MTOUCH_GET_YC(data) (((data[4])<<7) | data[3]) |
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#define MTOUCH_GET_TOUCHED(data) (MTOUCH_FORMAT_TABLET_TOUCH_BIT & data[0]) |
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/* |
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* Per-touchscreen data. |
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*/ |
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struct mtouch { |
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struct input_dev *dev; |
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struct serio *serio; |
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int idx; |
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unsigned char data[MTOUCH_MAX_LENGTH]; |
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char phys[32]; |
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}; |
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static void mtouch_process_format_tablet(struct mtouch *mtouch) |
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{ |
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struct input_dev *dev = mtouch->dev; |
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if (MTOUCH_FORMAT_TABLET_LENGTH == ++mtouch->idx) { |
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input_report_abs(dev, ABS_X, MTOUCH_GET_XC(mtouch->data)); |
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input_report_abs(dev, ABS_Y, MTOUCH_MAX_YC - MTOUCH_GET_YC(mtouch->data)); |
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input_report_key(dev, BTN_TOUCH, MTOUCH_GET_TOUCHED(mtouch->data)); |
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input_sync(dev); |
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mtouch->idx = 0; |
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} |
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} |
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static void mtouch_process_response(struct mtouch *mtouch) |
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{ |
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if (MTOUCH_RESPONSE_END_BYTE == mtouch->data[mtouch->idx++]) { |
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/* FIXME - process response */ |
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mtouch->idx = 0; |
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} else if (MTOUCH_MAX_LENGTH == mtouch->idx) { |
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printk(KERN_ERR "mtouch.c: too many response bytes\n"); |
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mtouch->idx = 0; |
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} |
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} |
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static irqreturn_t mtouch_interrupt(struct serio *serio, |
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unsigned char data, unsigned int flags) |
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{ |
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struct mtouch *mtouch = serio_get_drvdata(serio); |
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mtouch->data[mtouch->idx] = data; |
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if (MTOUCH_FORMAT_TABLET_STATUS_BIT & mtouch->data[0]) |
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mtouch_process_format_tablet(mtouch); |
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else if (MTOUCH_RESPONSE_BEGIN_BYTE == mtouch->data[0]) |
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mtouch_process_response(mtouch); |
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else |
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printk(KERN_DEBUG "mtouch.c: unknown/unsynchronized data from device, byte %x\n",mtouch->data[0]); |
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return IRQ_HANDLED; |
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} |
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/* |
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* mtouch_disconnect() is the opposite of mtouch_connect() |
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*/ |
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static void mtouch_disconnect(struct serio *serio) |
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{ |
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struct mtouch *mtouch = serio_get_drvdata(serio); |
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input_get_device(mtouch->dev); |
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input_unregister_device(mtouch->dev); |
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serio_close(serio); |
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serio_set_drvdata(serio, NULL); |
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input_put_device(mtouch->dev); |
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kfree(mtouch); |
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} |
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/* |
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* mtouch_connect() is the routine that is called when someone adds a |
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* new serio device that supports MicroTouch (Format Tablet) protocol and registers it as |
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* an input device. |
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*/ |
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static int mtouch_connect(struct serio *serio, struct serio_driver *drv) |
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{ |
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struct mtouch *mtouch; |
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struct input_dev *input_dev; |
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int err; |
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mtouch = kzalloc(sizeof(struct mtouch), GFP_KERNEL); |
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input_dev = input_allocate_device(); |
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if (!mtouch || !input_dev) { |
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err = -ENOMEM; |
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goto fail1; |
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} |
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mtouch->serio = serio; |
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mtouch->dev = input_dev; |
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snprintf(mtouch->phys, sizeof(mtouch->phys), "%s/input0", serio->phys); |
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input_dev->name = "MicroTouch Serial TouchScreen"; |
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input_dev->phys = mtouch->phys; |
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input_dev->id.bustype = BUS_RS232; |
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input_dev->id.vendor = SERIO_MICROTOUCH; |
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input_dev->id.product = 0; |
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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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input_set_abs_params(mtouch->dev, ABS_X, MTOUCH_MIN_XC, MTOUCH_MAX_XC, 0, 0); |
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input_set_abs_params(mtouch->dev, ABS_Y, MTOUCH_MIN_YC, MTOUCH_MAX_YC, 0, 0); |
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serio_set_drvdata(serio, mtouch); |
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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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err = input_register_device(mtouch->dev); |
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if (err) |
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goto fail3; |
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return 0; |
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fail3: serio_close(serio); |
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fail2: serio_set_drvdata(serio, NULL); |
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fail1: input_free_device(input_dev); |
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kfree(mtouch); |
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return err; |
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} |
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/* |
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* The serio driver structure. |
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*/ |
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static const struct serio_device_id mtouch_serio_ids[] = { |
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{ |
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.type = SERIO_RS232, |
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.proto = SERIO_MICROTOUCH, |
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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, mtouch_serio_ids); |
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static struct serio_driver mtouch_drv = { |
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.driver = { |
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.name = "mtouch", |
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}, |
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.description = DRIVER_DESC, |
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.id_table = mtouch_serio_ids, |
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.interrupt = mtouch_interrupt, |
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.connect = mtouch_connect, |
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.disconnect = mtouch_disconnect, |
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}; |
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module_serio_driver(mtouch_drv);
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