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be0524d38f
This is i.MX BSP 5.0.0 release ported to 2.6.31 Signed-off-by: Rob Herring <r.herring@freescale.com> Signed-off-by: Alan Tull <r80115@freescale.com> Signed-off-by: Xinyu Chen <xinyu.chen@freescale.com>
115 lines
2.9 KiB
C
115 lines
2.9 KiB
C
/*
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* Copyright 2009 Freescale Semiconductor, Inc. All Rights Reserved.
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*/
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/*
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* The code contained herein is licensed under the GNU General Public
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* License. You may obtain a copy of the GNU General Public License
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* Version 2 or later at the following locations:
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*
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* http://www.opensource.org/licenses/gpl-license.html
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* http://www.gnu.org/copyleft/gpl.html
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*/
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/*!
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* @file imx_adc_ts.c
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*
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* @brief Driver for the Freescale Semiconductor i.MX ADC touchscreen.
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*
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* This touchscreen driver is designed as a standard input driver. It is a
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* wrapper around the low level ADC driver. Much of the hardware configuration
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* and touchscreen functionality is implemented in the low level ADC driver.
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* During initialization, this driver creates a kernel thread. This thread
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* then calls the ADC driver to obtain touchscreen values continously. These
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* values are then passed to the input susbsystem.
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*
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* @ingroup touchscreen
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*/
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#include <linux/kernel.h>
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#include <linux/kthread.h>
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#include <linux/module.h>
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#include <linux/sched.h>
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#include <linux/input.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include <linux/freezer.h>
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#include <linux/imx_adc.h>
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#define IMX_ADC_TS_NAME "imx_adc_ts"
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static struct input_dev *imx_inputdev;
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static u32 input_ts_installed;
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static int ts_thread(void *arg)
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{
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struct t_touch_screen ts_sample;
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int wait = 0;
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daemonize("imx_adc_ts");
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while (input_ts_installed) {
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try_to_freeze();
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memset(&ts_sample, 0, sizeof(ts_sample));
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if (0 != imx_adc_get_touch_sample(&ts_sample, !wait))
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continue;
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input_report_abs(imx_inputdev, ABS_X, ts_sample.x_position);
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input_report_abs(imx_inputdev, ABS_Y, ts_sample.y_position);
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input_report_abs(imx_inputdev, ABS_PRESSURE,
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ts_sample.contact_resistance);
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input_sync(imx_inputdev);
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wait = ts_sample.contact_resistance;
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msleep(10);
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}
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return 0;
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}
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static int __init imx_adc_ts_init(void)
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{
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int retval;
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if (!is_imx_adc_ready())
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return -ENODEV;
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imx_inputdev = input_allocate_device();
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if (!imx_inputdev) {
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pr_err("imx_ts_init: not enough memory for input device\n");
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return -ENOMEM;
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}
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imx_inputdev->name = IMX_ADC_TS_NAME;
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imx_inputdev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
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imx_inputdev->keybit[BIT_WORD(BTN_TOUCH)] |= BIT_MASK(BTN_TOUCH);
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imx_inputdev->absbit[0] =
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BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) | BIT_MASK(ABS_PRESSURE);
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retval = input_register_device(imx_inputdev);
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if (retval < 0) {
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input_free_device(imx_inputdev);
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return retval;
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}
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input_ts_installed = 1;
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kthread_run(ts_thread, NULL, "ts_thread");
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pr_info("i.MX ADC input touchscreen loaded.\n");
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return 0;
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}
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static void __exit imx_adc_ts_exit(void)
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{
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input_ts_installed = 0;
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input_unregister_device(imx_inputdev);
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if (imx_inputdev) {
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input_free_device(imx_inputdev);
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imx_inputdev = NULL;
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}
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}
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late_initcall(imx_adc_ts_init);
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module_exit(imx_adc_ts_exit);
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MODULE_DESCRIPTION("i.MX ADC input touchscreen driver");
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MODULE_AUTHOR("Freescale Semiconductor, Inc.");
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MODULE_LICENSE("GPL");
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