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184 lines
4.5 KiB
184 lines
4.5 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Hampshire serial touchscreen driver |
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* |
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* Copyright (c) 2010 Adam Bennett |
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* Based on the dynapro driver (c) Tias Guns |
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*/ |
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/* |
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* 2010/04/08 Adam Bennett <[email protected]> |
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* Copied dynapro.c and edited for Hampshire 4-byte 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 "Hampshire serial touchscreen driver" |
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MODULE_AUTHOR("Adam Bennett <[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 HAMPSHIRE_FORMAT_TOUCH_BIT 0x40 |
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#define HAMPSHIRE_FORMAT_LENGTH 4 |
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#define HAMPSHIRE_RESPONSE_BEGIN_BYTE 0x80 |
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#define HAMPSHIRE_MIN_XC 0 |
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#define HAMPSHIRE_MAX_XC 0x1000 |
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#define HAMPSHIRE_MIN_YC 0 |
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#define HAMPSHIRE_MAX_YC 0x1000 |
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#define HAMPSHIRE_GET_XC(data) (((data[3] & 0x0c) >> 2) | (data[1] << 2) | ((data[0] & 0x38) << 6)) |
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#define HAMPSHIRE_GET_YC(data) ((data[3] & 0x03) | (data[2] << 2) | ((data[0] & 0x07) << 9)) |
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#define HAMPSHIRE_GET_TOUCHED(data) (HAMPSHIRE_FORMAT_TOUCH_BIT & data[0]) |
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/* |
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* Per-touchscreen data. |
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*/ |
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struct hampshire { |
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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[HAMPSHIRE_FORMAT_LENGTH]; |
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char phys[32]; |
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}; |
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static void hampshire_process_data(struct hampshire *phampshire) |
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{ |
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struct input_dev *dev = phampshire->dev; |
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if (HAMPSHIRE_FORMAT_LENGTH == ++phampshire->idx) { |
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input_report_abs(dev, ABS_X, HAMPSHIRE_GET_XC(phampshire->data)); |
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input_report_abs(dev, ABS_Y, HAMPSHIRE_GET_YC(phampshire->data)); |
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input_report_key(dev, BTN_TOUCH, |
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HAMPSHIRE_GET_TOUCHED(phampshire->data)); |
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input_sync(dev); |
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phampshire->idx = 0; |
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} |
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} |
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static irqreturn_t hampshire_interrupt(struct serio *serio, |
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unsigned char data, unsigned int flags) |
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{ |
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struct hampshire *phampshire = serio_get_drvdata(serio); |
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phampshire->data[phampshire->idx] = data; |
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if (HAMPSHIRE_RESPONSE_BEGIN_BYTE & phampshire->data[0]) |
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hampshire_process_data(phampshire); |
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else |
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dev_dbg(&serio->dev, "unknown/unsynchronized data: %x\n", |
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phampshire->data[0]); |
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return IRQ_HANDLED; |
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} |
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static void hampshire_disconnect(struct serio *serio) |
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{ |
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struct hampshire *phampshire = serio_get_drvdata(serio); |
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input_get_device(phampshire->dev); |
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input_unregister_device(phampshire->dev); |
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serio_close(serio); |
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serio_set_drvdata(serio, NULL); |
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input_put_device(phampshire->dev); |
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kfree(phampshire); |
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} |
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/* |
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* hampshire_connect() is the routine that is called when someone adds a |
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* new serio device that supports hampshire protocol and registers it as |
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* an input device. This is usually accomplished using inputattach. |
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*/ |
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static int hampshire_connect(struct serio *serio, struct serio_driver *drv) |
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{ |
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struct hampshire *phampshire; |
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struct input_dev *input_dev; |
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int err; |
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phampshire = kzalloc(sizeof(struct hampshire), GFP_KERNEL); |
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input_dev = input_allocate_device(); |
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if (!phampshire || !input_dev) { |
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err = -ENOMEM; |
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goto fail1; |
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} |
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phampshire->serio = serio; |
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phampshire->dev = input_dev; |
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snprintf(phampshire->phys, sizeof(phampshire->phys), |
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"%s/input0", serio->phys); |
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input_dev->name = "Hampshire Serial TouchScreen"; |
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input_dev->phys = phampshire->phys; |
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input_dev->id.bustype = BUS_RS232; |
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input_dev->id.vendor = SERIO_HAMPSHIRE; |
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input_dev->id.product = 0; |
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input_dev->id.version = 0x0001; |
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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(phampshire->dev, ABS_X, |
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HAMPSHIRE_MIN_XC, HAMPSHIRE_MAX_XC, 0, 0); |
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input_set_abs_params(phampshire->dev, ABS_Y, |
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HAMPSHIRE_MIN_YC, HAMPSHIRE_MAX_YC, 0, 0); |
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serio_set_drvdata(serio, phampshire); |
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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(phampshire->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(phampshire); |
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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 hampshire_serio_ids[] = { |
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{ |
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.type = SERIO_RS232, |
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.proto = SERIO_HAMPSHIRE, |
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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, hampshire_serio_ids); |
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static struct serio_driver hampshire_drv = { |
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.driver = { |
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.name = "hampshire", |
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}, |
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.description = DRIVER_DESC, |
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.id_table = hampshire_serio_ids, |
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.interrupt = hampshire_interrupt, |
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.connect = hampshire_connect, |
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.disconnect = hampshire_disconnect, |
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}; |
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module_serio_driver(hampshire_drv);
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