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Release 4.11 drivers/input/touchscreen/jornada720_ts.c

/*
 * drivers/input/touchscreen/jornada720_ts.c
 *
 * Copyright (C) 2007 Kristoffer Ericson <Kristoffer.Ericson@gmail.com>
 *
 *  Copyright (C) 2006 Filip Zyzniewski <filip.zyzniewski@tefnet.pl>
 *  based on HP Jornada 56x touchscreen driver by Alex Lange <chicken@handhelds.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * HP Jornada 710/720/729 Touchscreen Driver
 */

#include <linux/gpio/consumer.h>
#include <linux/platform_device.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/io.h>

#include <mach/jornada720.h>

MODULE_AUTHOR("Kristoffer Ericson <kristoffer.ericson@gmail.com>");
MODULE_DESCRIPTION("HP Jornada 710/720/728 touchscreen driver");
MODULE_LICENSE("GPL v2");


struct jornada_ts {
	
struct input_dev *dev;
	
struct gpio_desc *gpio;
	
int x_data[4];		/* X sample values */
	
int y_data[4];		/* Y sample values */
};


static void jornada720_ts_collect_data(struct jornada_ts *jornada_ts) { /* 3 low word X samples */ jornada_ts->x_data[0] = jornada_ssp_byte(TXDUMMY); jornada_ts->x_data[1] = jornada_ssp_byte(TXDUMMY); jornada_ts->x_data[2] = jornada_ssp_byte(TXDUMMY); /* 3 low word Y samples */ jornada_ts->y_data[0] = jornada_ssp_byte(TXDUMMY); jornada_ts->y_data[1] = jornada_ssp_byte(TXDUMMY); jornada_ts->y_data[2] = jornada_ssp_byte(TXDUMMY); /* combined x samples bits */ jornada_ts->x_data[3] = jornada_ssp_byte(TXDUMMY); /* combined y samples bits */ jornada_ts->y_data[3] = jornada_ssp_byte(TXDUMMY); }

Contributors

PersonTokensPropCommitsCommitProp
Kristoffer Ericson111100.00%1100.00%
Total111100.00%1100.00%


static int jornada720_ts_average(int coords[4]) { int coord, high_bits = coords[3]; coord = coords[0] | ((high_bits & 0x03) << 8); coord += coords[1] | ((high_bits & 0x0c) << 6); coord += coords[2] | ((high_bits & 0x30) << 4); return coord / 3; }

Contributors

PersonTokensPropCommitsCommitProp
Kristoffer Ericson78100.00%1100.00%
Total78100.00%1100.00%


static irqreturn_t jornada720_ts_interrupt(int irq, void *dev_id) { struct platform_device *pdev = dev_id; struct jornada_ts *jornada_ts = platform_get_drvdata(pdev); struct input_dev *input = jornada_ts->dev; int x, y; /* If gpio is high then report pen up */ if (gpiod_get_value(jornada_ts->gpio)) { input_report_key(input, BTN_TOUCH, 0); input_sync(input); } else { jornada_ssp_start(); /* proper reply to request is always TXDUMMY */ if (jornada_ssp_inout(GETTOUCHSAMPLES) == TXDUMMY) { jornada720_ts_collect_data(jornada_ts); x = jornada720_ts_average(jornada_ts->x_data); y = jornada720_ts_average(jornada_ts->y_data); input_report_key(input, BTN_TOUCH, 1); input_report_abs(input, ABS_X, x); input_report_abs(input, ABS_Y, y); input_sync(input); } jornada_ssp_end(); } return IRQ_HANDLED; }

Contributors

PersonTokensPropCommitsCommitProp
Kristoffer Ericson14496.64%150.00%
Russell King53.36%150.00%
Total149100.00%2100.00%


static int jornada720_ts_probe(struct platform_device *pdev) { struct jornada_ts *jornada_ts; struct input_dev *input_dev; int error, irq; jornada_ts = devm_kzalloc(&pdev->dev, sizeof(*jornada_ts), GFP_KERNEL); if (!jornada_ts) return -ENOMEM; input_dev = devm_input_allocate_device(&pdev->dev); if (!input_dev) return -ENOMEM; platform_set_drvdata(pdev, jornada_ts); jornada_ts->gpio = devm_gpiod_get(&pdev->dev, "penup", GPIOD_IN); if (IS_ERR(jornada_ts->gpio)) return PTR_ERR(jornada_ts->gpio); irq = gpiod_to_irq(jornada_ts->gpio); if (irq <= 0) return irq < 0 ? irq : -EINVAL; jornada_ts->dev = input_dev; input_dev->name = "HP Jornada 7xx Touchscreen"; input_dev->phys = "jornadats/input0"; input_dev->id.bustype = BUS_HOST; input_dev->dev.parent = &pdev->dev; input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); input_set_abs_params(input_dev, ABS_X, 270, 3900, 0, 0); input_set_abs_params(input_dev, ABS_Y, 180, 3700, 0, 0); error = devm_request_irq(&pdev->dev, irq, jornada720_ts_interrupt, IRQF_TRIGGER_RISING, "HP7XX Touchscreen driver", pdev); if (error) { dev_err(&pdev->dev, "HP7XX TS : Unable to acquire irq!\n"); return error; } error = input_register_device(jornada_ts->dev); if (error) return error; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Kristoffer Ericson19365.65%250.00%
Russell King6120.75%125.00%
Pramod Gurav4013.61%125.00%
Total294100.00%4100.00%

/* work with hotplug and coldplug */ MODULE_ALIAS("platform:jornada_ts"); static struct platform_driver jornada720_ts_driver = { .probe = jornada720_ts_probe, .driver = { .name = "jornada_ts", }, }; module_platform_driver(jornada720_ts_driver);

Overall Contributors

PersonTokensPropCommitsCommitProp
Kristoffer Ericson60482.29%220.00%
Russell King7810.63%330.00%
Pramod Gurav405.45%110.00%
Kay Sievers60.82%110.00%
Tejun Heo30.41%110.00%
JJ Ding20.27%110.00%
Al Viro10.14%110.00%
Total734100.00%10100.00%
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