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190 lines
4.3 KiB
190 lines
4.3 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* EETI Egalax serial touchscreen driver |
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* |
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* Copyright (c) 2015 Zoltán Böszörményi <[email protected]> |
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* |
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* based on the |
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* |
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* Hampshire serial touchscreen driver (Copyright (c) 2010 Adam Bennett) |
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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 "EETI Egalax serial touchscreen driver" |
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/* |
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* Definitions & global arrays. |
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*/ |
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#define EGALAX_FORMAT_MAX_LENGTH 6 |
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#define EGALAX_FORMAT_START_BIT BIT(7) |
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#define EGALAX_FORMAT_PRESSURE_BIT BIT(6) |
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#define EGALAX_FORMAT_TOUCH_BIT BIT(0) |
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#define EGALAX_FORMAT_RESOLUTION_MASK 0x06 |
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#define EGALAX_MIN_XC 0 |
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#define EGALAX_MAX_XC 0x4000 |
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#define EGALAX_MIN_YC 0 |
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#define EGALAX_MAX_YC 0x4000 |
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/* |
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* Per-touchscreen data. |
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*/ |
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struct egalax { |
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struct input_dev *input; |
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struct serio *serio; |
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int idx; |
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u8 data[EGALAX_FORMAT_MAX_LENGTH]; |
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char phys[32]; |
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}; |
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static void egalax_process_data(struct egalax *egalax) |
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{ |
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struct input_dev *dev = egalax->input; |
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u8 *data = egalax->data; |
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u16 x, y; |
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u8 shift; |
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u8 mask; |
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shift = 3 - ((data[0] & EGALAX_FORMAT_RESOLUTION_MASK) >> 1); |
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mask = 0xff >> (shift + 1); |
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x = (((u16)(data[1] & mask) << 7) | (data[2] & 0x7f)) << shift; |
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y = (((u16)(data[3] & mask) << 7) | (data[4] & 0x7f)) << shift; |
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input_report_key(dev, BTN_TOUCH, data[0] & EGALAX_FORMAT_TOUCH_BIT); |
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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_sync(dev); |
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} |
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static irqreturn_t egalax_interrupt(struct serio *serio, |
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unsigned char data, unsigned int flags) |
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{ |
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struct egalax *egalax = serio_get_drvdata(serio); |
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int pkt_len; |
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egalax->data[egalax->idx++] = data; |
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if (likely(egalax->data[0] & EGALAX_FORMAT_START_BIT)) { |
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pkt_len = egalax->data[0] & EGALAX_FORMAT_PRESSURE_BIT ? 6 : 5; |
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if (pkt_len == egalax->idx) { |
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egalax_process_data(egalax); |
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egalax->idx = 0; |
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} |
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} else { |
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dev_dbg(&serio->dev, "unknown/unsynchronized data: %x\n", |
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egalax->data[0]); |
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egalax->idx = 0; |
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} |
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return IRQ_HANDLED; |
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} |
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/* |
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* egalax_connect() is the routine that is called when someone adds a |
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* new serio device that supports egalax 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 egalax_connect(struct serio *serio, struct serio_driver *drv) |
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{ |
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struct egalax *egalax; |
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struct input_dev *input_dev; |
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int error; |
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egalax = kzalloc(sizeof(struct egalax), GFP_KERNEL); |
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input_dev = input_allocate_device(); |
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if (!egalax || !input_dev) { |
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error = -ENOMEM; |
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goto err_free_mem; |
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} |
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egalax->serio = serio; |
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egalax->input = input_dev; |
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snprintf(egalax->phys, sizeof(egalax->phys), |
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"%s/input0", serio->phys); |
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input_dev->name = "EETI eGalaxTouch Serial TouchScreen"; |
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input_dev->phys = egalax->phys; |
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input_dev->id.bustype = BUS_RS232; |
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input_dev->id.vendor = SERIO_EGALAX; |
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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_set_capability(input_dev, EV_KEY, BTN_TOUCH); |
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input_set_abs_params(input_dev, ABS_X, |
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EGALAX_MIN_XC, EGALAX_MAX_XC, 0, 0); |
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input_set_abs_params(input_dev, ABS_Y, |
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EGALAX_MIN_YC, EGALAX_MAX_YC, 0, 0); |
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serio_set_drvdata(serio, egalax); |
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error = serio_open(serio, drv); |
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if (error) |
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goto err_reset_drvdata; |
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error = input_register_device(input_dev); |
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if (error) |
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goto err_close_serio; |
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return 0; |
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err_close_serio: |
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serio_close(serio); |
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err_reset_drvdata: |
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serio_set_drvdata(serio, NULL); |
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err_free_mem: |
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input_free_device(input_dev); |
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kfree(egalax); |
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return error; |
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} |
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static void egalax_disconnect(struct serio *serio) |
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{ |
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struct egalax *egalax = serio_get_drvdata(serio); |
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serio_close(serio); |
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serio_set_drvdata(serio, NULL); |
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input_unregister_device(egalax->input); |
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kfree(egalax); |
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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 egalax_serio_ids[] = { |
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{ |
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.type = SERIO_RS232, |
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.proto = SERIO_EGALAX, |
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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, egalax_serio_ids); |
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static struct serio_driver egalax_drv = { |
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.driver = { |
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.name = "egalax", |
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}, |
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.description = DRIVER_DESC, |
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.id_table = egalax_serio_ids, |
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.interrupt = egalax_interrupt, |
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.connect = egalax_connect, |
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.disconnect = egalax_disconnect, |
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}; |
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module_serio_driver(egalax_drv); |
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MODULE_AUTHOR("Zoltán Böszörményi <[email protected]>"); |
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MODULE_DESCRIPTION(DRIVER_DESC); |
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MODULE_LICENSE("GPL v2");
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