161 lines
4.3 KiB
C
161 lines
4.3 KiB
C
/*
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* drivers/input/touchscreen/jornada720_ts.c
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*
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* Copyright (C) 2007 Kristoffer Ericson <Kristoffer.Ericson@gmail.com>
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*
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* Copyright (C) 2006 Filip Zyzniewski <filip.zyzniewski@tefnet.pl>
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* based on HP Jornada 56x touchscreen driver by Alex Lange <chicken@handhelds.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* HP Jornada 710/720/729 Touchscreen Driver
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*/
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#include <linux/gpio/consumer.h>
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#include <linux/platform_device.h>
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#include <linux/input.h>
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#include <linux/interrupt.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/io.h>
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#include <mach/jornada720.h>
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MODULE_AUTHOR("Kristoffer Ericson <kristoffer.ericson@gmail.com>");
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MODULE_DESCRIPTION("HP Jornada 710/720/728 touchscreen driver");
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MODULE_LICENSE("GPL v2");
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struct jornada_ts {
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struct input_dev *dev;
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struct gpio_desc *gpio;
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int x_data[4]; /* X sample values */
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int y_data[4]; /* Y sample values */
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};
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static void jornada720_ts_collect_data(struct jornada_ts *jornada_ts)
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{
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/* 3 low word X samples */
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jornada_ts->x_data[0] = jornada_ssp_byte(TXDUMMY);
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jornada_ts->x_data[1] = jornada_ssp_byte(TXDUMMY);
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jornada_ts->x_data[2] = jornada_ssp_byte(TXDUMMY);
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/* 3 low word Y samples */
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jornada_ts->y_data[0] = jornada_ssp_byte(TXDUMMY);
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jornada_ts->y_data[1] = jornada_ssp_byte(TXDUMMY);
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jornada_ts->y_data[2] = jornada_ssp_byte(TXDUMMY);
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/* combined x samples bits */
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jornada_ts->x_data[3] = jornada_ssp_byte(TXDUMMY);
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/* combined y samples bits */
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jornada_ts->y_data[3] = jornada_ssp_byte(TXDUMMY);
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}
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static int jornada720_ts_average(int coords[4])
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{
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int coord, high_bits = coords[3];
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coord = coords[0] | ((high_bits & 0x03) << 8);
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coord += coords[1] | ((high_bits & 0x0c) << 6);
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coord += coords[2] | ((high_bits & 0x30) << 4);
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return coord / 3;
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}
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static irqreturn_t jornada720_ts_interrupt(int irq, void *dev_id)
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{
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struct platform_device *pdev = dev_id;
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struct jornada_ts *jornada_ts = platform_get_drvdata(pdev);
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struct input_dev *input = jornada_ts->dev;
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int x, y;
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/* If gpio is high then report pen up */
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if (gpiod_get_value(jornada_ts->gpio)) {
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input_report_key(input, BTN_TOUCH, 0);
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input_sync(input);
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} else {
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jornada_ssp_start();
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/* proper reply to request is always TXDUMMY */
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if (jornada_ssp_inout(GETTOUCHSAMPLES) == TXDUMMY) {
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jornada720_ts_collect_data(jornada_ts);
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x = jornada720_ts_average(jornada_ts->x_data);
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y = jornada720_ts_average(jornada_ts->y_data);
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input_report_key(input, BTN_TOUCH, 1);
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input_report_abs(input, ABS_X, x);
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input_report_abs(input, ABS_Y, y);
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input_sync(input);
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}
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jornada_ssp_end();
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}
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return IRQ_HANDLED;
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}
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static int jornada720_ts_probe(struct platform_device *pdev)
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{
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struct jornada_ts *jornada_ts;
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struct input_dev *input_dev;
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int error, irq;
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jornada_ts = devm_kzalloc(&pdev->dev, sizeof(*jornada_ts), GFP_KERNEL);
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if (!jornada_ts)
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return -ENOMEM;
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input_dev = devm_input_allocate_device(&pdev->dev);
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if (!input_dev)
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return -ENOMEM;
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platform_set_drvdata(pdev, jornada_ts);
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jornada_ts->gpio = devm_gpiod_get(&pdev->dev, "penup", GPIOD_IN);
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if (IS_ERR(jornada_ts->gpio))
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return PTR_ERR(jornada_ts->gpio);
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irq = gpiod_to_irq(jornada_ts->gpio);
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if (irq <= 0)
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return irq < 0 ? irq : -EINVAL;
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jornada_ts->dev = input_dev;
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input_dev->name = "HP Jornada 7xx Touchscreen";
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input_dev->phys = "jornadats/input0";
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input_dev->id.bustype = BUS_HOST;
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input_dev->dev.parent = &pdev->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(input_dev, ABS_X, 270, 3900, 0, 0);
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input_set_abs_params(input_dev, ABS_Y, 180, 3700, 0, 0);
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error = devm_request_irq(&pdev->dev, irq, jornada720_ts_interrupt,
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IRQF_TRIGGER_RISING,
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"HP7XX Touchscreen driver", pdev);
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if (error) {
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dev_err(&pdev->dev, "HP7XX TS : Unable to acquire irq!\n");
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return error;
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}
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error = input_register_device(jornada_ts->dev);
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if (error)
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return error;
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return 0;
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}
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/* work with hotplug and coldplug */
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MODULE_ALIAS("platform:jornada_ts");
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static struct platform_driver jornada720_ts_driver = {
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.probe = jornada720_ts_probe,
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.driver = {
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.name = "jornada_ts",
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},
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};
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module_platform_driver(jornada720_ts_driver);
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