167 lines
3.8 KiB
C
167 lines
3.8 KiB
C
/*
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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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* h3600 atmel micro companion support, touchscreen subdevice
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* Author : Alessandro Gardich <gremlin@gremlin.it>
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* Author : Dmitry Artamonow <mad_soft@inbox.ru>
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* Author : Linus Walleij <linus.walleij@linaro.org>
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*
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*/
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#include <asm/byteorder.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/pm.h>
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#include <linux/delay.h>
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#include <linux/device.h>
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#include <linux/input.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/mfd/ipaq-micro.h>
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struct touchscreen_data {
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struct input_dev *input;
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struct ipaq_micro *micro;
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};
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static void micro_ts_receive(void *data, int len, unsigned char *msg)
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{
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struct touchscreen_data *ts = data;
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if (len == 4) {
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input_report_abs(ts->input, ABS_X,
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be16_to_cpup((__be16 *) &msg[2]));
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input_report_abs(ts->input, ABS_Y,
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be16_to_cpup((__be16 *) &msg[0]));
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input_report_key(ts->input, BTN_TOUCH, 1);
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input_sync(ts->input);
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} else if (len == 0) {
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input_report_abs(ts->input, ABS_X, 0);
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input_report_abs(ts->input, ABS_Y, 0);
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input_report_key(ts->input, BTN_TOUCH, 0);
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input_sync(ts->input);
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}
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}
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static void micro_ts_toggle_receive(struct touchscreen_data *ts, bool enable)
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{
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struct ipaq_micro *micro = ts->micro;
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spin_lock_irq(µ->lock);
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if (enable) {
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micro->ts = micro_ts_receive;
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micro->ts_data = ts;
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} else {
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micro->ts = NULL;
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micro->ts_data = NULL;
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}
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spin_unlock_irq(&ts->micro->lock);
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}
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static int micro_ts_open(struct input_dev *input)
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{
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struct touchscreen_data *ts = input_get_drvdata(input);
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micro_ts_toggle_receive(ts, true);
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return 0;
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}
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static void micro_ts_close(struct input_dev *input)
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{
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struct touchscreen_data *ts = input_get_drvdata(input);
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micro_ts_toggle_receive(ts, false);
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}
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static int micro_ts_probe(struct platform_device *pdev)
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{
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struct ipaq_micro *micro = dev_get_drvdata(pdev->dev.parent);
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struct touchscreen_data *ts;
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int error;
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ts = devm_kzalloc(&pdev->dev, sizeof(*ts), GFP_KERNEL);
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if (!ts)
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return -ENOMEM;
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ts->micro = micro;
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ts->input = devm_input_allocate_device(&pdev->dev);
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if (!ts->input) {
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dev_err(&pdev->dev, "failed to allocate input device\n");
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return -ENOMEM;
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}
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ts->input->name = "ipaq micro ts";
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ts->input->open = micro_ts_open;
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ts->input->close = micro_ts_close;
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input_set_drvdata(ts->input, ts);
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input_set_capability(ts->input, EV_KEY, BTN_TOUCH);
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input_set_capability(ts->input, EV_ABS, ABS_X);
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input_set_capability(ts->input, EV_ABS, ABS_Y);
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input_set_abs_params(ts->input, ABS_X, 0, 1023, 0, 0);
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input_set_abs_params(ts->input, ABS_Y, 0, 1023, 0, 0);
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error = input_register_device(ts->input);
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if (error) {
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dev_err(&pdev->dev, "error registering touch input\n");
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return error;
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}
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platform_set_drvdata(pdev, ts);
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dev_info(&pdev->dev, "iPAQ micro touchscreen\n");
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return 0;
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}
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#ifdef CONFIG_PM_SLEEP
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static int micro_ts_suspend(struct device *dev)
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{
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struct touchscreen_data *ts = dev_get_drvdata(dev);
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micro_ts_toggle_receive(ts, false);
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return 0;
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}
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static int micro_ts_resume(struct device *dev)
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{
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struct touchscreen_data *ts = dev_get_drvdata(dev);
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struct input_dev *input = ts->input;
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mutex_lock(&input->mutex);
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if (input->users)
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micro_ts_toggle_receive(ts, true);
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mutex_unlock(&input->mutex);
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return 0;
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}
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#endif
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static const struct dev_pm_ops micro_ts_dev_pm_ops = {
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SET_SYSTEM_SLEEP_PM_OPS(micro_ts_suspend, micro_ts_resume)
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};
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static struct platform_driver micro_ts_device_driver = {
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.driver = {
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.name = "ipaq-micro-ts",
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.pm = µ_ts_dev_pm_ops,
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},
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.probe = micro_ts_probe,
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};
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module_platform_driver(micro_ts_device_driver);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("driver for iPAQ Atmel micro touchscreen");
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MODULE_ALIAS("platform:ipaq-micro-ts");
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