From 5637f02a9cf84f2c00fd8a0f6561c375bb19103b Mon Sep 17 00:00:00 2001 From: Kristoffer Ericson Date: Wed, 26 Sep 2007 00:02:56 -0400 Subject: Input: add support for the HP Jornada 7xx (710/720/728) touchscreen Signed-off-by: Kristoffer Ericson Signed-off-by: Dmitry Torokhov --- drivers/input/touchscreen/jornada720_ts.c | 182 ++++++++++++++++++++++++++++++ 1 file changed, 182 insertions(+) create mode 100644 drivers/input/touchscreen/jornada720_ts.c (limited to 'drivers/input/touchscreen/jornada720_ts.c') diff --git a/drivers/input/touchscreen/jornada720_ts.c b/drivers/input/touchscreen/jornada720_ts.c new file mode 100644 index 000000000000..42a1c9a1940e --- /dev/null +++ b/drivers/input/touchscreen/jornada720_ts.c @@ -0,0 +1,182 @@ +/* + * drivers/input/touchscreen/jornada720_ts.c + * + * Copyright (C) 2007 Kristoffer Ericson + * + * Copyright (C) 2006 Filip Zyzniewski + * based on HP Jornada 56x touchscreen driver by Alex Lange + * + * 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 +#include +#include +#include +#include + +#include +#include + +MODULE_AUTHOR("Kristoffer Ericson "); +MODULE_DESCRIPTION("HP Jornada 710/720/728 touchscreen driver"); +MODULE_LICENSE("GPLv2"); + +struct jornada_ts { + struct input_dev *dev; + 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); +} + +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; +} + +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_GPIO9 is set to high then report pen up */ + if (GPLR & GPIO_GPIO(9)) { + 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; +} + +static int __devinit jornada720_ts_probe(struct platform_device *pdev) +{ + struct jornada_ts *jornada_ts; + struct input_dev *input_dev; + int error; + + jornada_ts = kzalloc(sizeof(struct jornada_ts), GFP_KERNEL); + input_dev = input_allocate_device(); + + if (!jornada_ts || !input_dev) { + error = -ENOMEM; + goto fail1; + } + + platform_set_drvdata(pdev, jornada_ts); + + 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(EV_KEY) | BIT(EV_ABS); + input_dev->keybit[LONG(BTN_TOUCH)] = BIT(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 = request_irq(IRQ_GPIO9, + jornada720_ts_interrupt, + IRQF_DISABLED | IRQF_TRIGGER_RISING, + "HP7XX Touchscreen driver", pdev); + if (error) { + printk(KERN_INFO "HP7XX TS : Unable to acquire irq!\n"); + goto fail1; + } + + error = input_register_device(jornada_ts->dev); + if (error) + goto fail2; + + return 0; + + fail2: + free_irq(IRQ_GPIO9, pdev); + fail1: + platform_set_drvdata(pdev, NULL); + input_free_device(input_dev); + kfree(jornada_ts); + return error; +} + +static int __devexit jornada720_ts_remove(struct platform_device *pdev) +{ + struct jornada_ts *jornada_ts = platform_get_drvdata(pdev); + + free_irq(IRQ_GPIO9, pdev); + platform_set_drvdata(pdev, NULL); + input_unregister_device(jornada_ts->dev); + kfree(jornada_ts); + + return 0; +} + +static struct platform_driver jornada720_ts_driver = { + .probe = jornada720_ts_probe, + .remove = __devexit_p(jornada720_ts_remove), + .driver = { + .name = "jornada_ts", + }, +}; + +static int __init jornada720_ts_init(void) +{ + return platform_driver_register(&jornada720_ts_driver); +} + +static void __exit jornada720_ts_exit(void) +{ + platform_driver_unregister(&jornada720_ts_driver); +} + +module_init(jornada720_ts_init); +module_exit(jornada720_ts_exit); -- cgit v1.2.3