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