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161 lines
3.7 KiB
161 lines
3.7 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* |
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* h3600 atmel micro companion support, touchscreen subdevice |
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* Author : Alessandro Gardich <[email protected]> |
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* Author : Dmitry Artamonow <[email protected]> |
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* Author : Linus Walleij <[email protected]> |
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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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static int __maybe_unused 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 __maybe_unused 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_device_enabled(input)) |
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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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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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