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173 lines
3.8 KiB
173 lines
3.8 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Fujitsu serial touchscreen driver |
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* |
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* Copyright (c) Dmitry Torokhov <[email protected]> |
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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 "Fujitsu serial touchscreen driver" |
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MODULE_AUTHOR("Dmitry Torokhov <[email protected]>"); |
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MODULE_DESCRIPTION(DRIVER_DESC); |
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MODULE_LICENSE("GPL"); |
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#define FUJITSU_LENGTH 5 |
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/* |
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* Per-touchscreen data. |
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*/ |
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struct fujitsu { |
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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[FUJITSU_LENGTH]; |
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char phys[32]; |
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}; |
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/* |
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* Decode serial data (5 bytes per packet) |
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* First byte |
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* 1 C 0 0 R S S S |
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* Where C is 1 while in calibration mode (which we don't use) |
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* R is 1 when no coordinate corection was done. |
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* S are button state |
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*/ |
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static irqreturn_t fujitsu_interrupt(struct serio *serio, |
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unsigned char data, unsigned int flags) |
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{ |
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struct fujitsu *fujitsu = serio_get_drvdata(serio); |
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struct input_dev *dev = fujitsu->dev; |
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if (fujitsu->idx == 0) { |
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/* resync skip until start of frame */ |
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if ((data & 0xf0) != 0x80) |
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return IRQ_HANDLED; |
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} else { |
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/* resync skip garbage */ |
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if (data & 0x80) { |
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fujitsu->idx = 0; |
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return IRQ_HANDLED; |
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} |
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} |
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fujitsu->data[fujitsu->idx++] = data; |
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if (fujitsu->idx == FUJITSU_LENGTH) { |
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input_report_abs(dev, ABS_X, |
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(fujitsu->data[2] << 7) | fujitsu->data[1]); |
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input_report_abs(dev, ABS_Y, |
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(fujitsu->data[4] << 7) | fujitsu->data[3]); |
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input_report_key(dev, BTN_TOUCH, |
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(fujitsu->data[0] & 0x03) != 2); |
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input_sync(dev); |
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fujitsu->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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* fujitsu_disconnect() is the opposite of fujitsu_connect() |
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*/ |
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static void fujitsu_disconnect(struct serio *serio) |
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{ |
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struct fujitsu *fujitsu = serio_get_drvdata(serio); |
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input_get_device(fujitsu->dev); |
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input_unregister_device(fujitsu->dev); |
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serio_close(serio); |
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serio_set_drvdata(serio, NULL); |
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input_put_device(fujitsu->dev); |
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kfree(fujitsu); |
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} |
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/* |
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* fujitsu_connect() is the routine that is called when someone adds a |
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* new serio device that supports the Fujitsu protocol and registers it |
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* as input device. |
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*/ |
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static int fujitsu_connect(struct serio *serio, struct serio_driver *drv) |
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{ |
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struct fujitsu *fujitsu; |
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struct input_dev *input_dev; |
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int err; |
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fujitsu = kzalloc(sizeof(struct fujitsu), GFP_KERNEL); |
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input_dev = input_allocate_device(); |
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if (!fujitsu || !input_dev) { |
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err = -ENOMEM; |
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goto fail1; |
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} |
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fujitsu->serio = serio; |
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fujitsu->dev = input_dev; |
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snprintf(fujitsu->phys, sizeof(fujitsu->phys), |
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"%s/input0", serio->phys); |
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input_dev->name = "Fujitsu Serial Touchscreen"; |
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input_dev->phys = fujitsu->phys; |
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input_dev->id.bustype = BUS_RS232; |
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input_dev->id.vendor = SERIO_FUJITSU; |
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input_dev->id.product = 0; |
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input_dev->id.version = 0x0100; |
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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(input_dev, ABS_X, 0, 4096, 0, 0); |
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input_set_abs_params(input_dev, ABS_Y, 0, 4096, 0, 0); |
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serio_set_drvdata(serio, fujitsu); |
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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(fujitsu->dev); |
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if (err) |
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goto fail3; |
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return 0; |
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fail3: |
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serio_close(serio); |
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fail2: |
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serio_set_drvdata(serio, NULL); |
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fail1: |
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input_free_device(input_dev); |
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kfree(fujitsu); |
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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 fujitsu_serio_ids[] = { |
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{ |
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.type = SERIO_RS232, |
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.proto = SERIO_FUJITSU, |
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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, fujitsu_serio_ids); |
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static struct serio_driver fujitsu_drv = { |
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.driver = { |
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.name = "fujitsu_ts", |
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}, |
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.description = DRIVER_DESC, |
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.id_table = fujitsu_serio_ids, |
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.interrupt = fujitsu_interrupt, |
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.connect = fujitsu_connect, |
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.disconnect = fujitsu_disconnect, |
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}; |
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module_serio_driver(fujitsu_drv);
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