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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>
119 lines
3.0 KiB
C
119 lines
3.0 KiB
C
/*
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* Copyright 2007-2009 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 mxc_ts.c
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*
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* @brief Driver for the Freescale Semiconductor MXC touchscreen.
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*
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* The touchscreen driver is designed as a standard input driver which is a
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* wrapper over low level PMIC driver. Most of the hardware configuration and
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* touchscreen functionality is implemented in the low level PMIC driver. During
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* initialization, this driver creates a kernel thread. This thread then calls
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* PMIC driver to obtain touchscreen values continously. These values are then
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* 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/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/pmic_external.h>
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#include <linux/pmic_adc.h>
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#define MXC_TS_NAME "mxc_ts"
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static struct input_dev *mxc_inputdev = NULL;
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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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t_touch_screen ts_sample;
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s32 wait = 0;
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daemonize("mxc_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(t_touch_screen));
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if (0 != pmic_adc_get_touch_sample(&ts_sample, !wait))
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continue;
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if (!(ts_sample.contact_resistance || wait))
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continue;
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input_report_abs(mxc_inputdev, ABS_X, ts_sample.x_position);
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input_report_abs(mxc_inputdev, ABS_Y, ts_sample.y_position);
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input_report_abs(mxc_inputdev, ABS_PRESSURE,
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ts_sample.contact_resistance);
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input_sync(mxc_inputdev);
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wait = ts_sample.contact_resistance;
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msleep(20);
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}
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return 0;
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}
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static int __init mxc_ts_init(void)
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{
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int retval;
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if (!is_pmic_adc_ready())
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return -ENODEV;
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mxc_inputdev = input_allocate_device();
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if (!mxc_inputdev) {
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printk(KERN_ERR
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"mxc_ts_init: not enough memory for input device\n");
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return -ENOMEM;
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}
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mxc_inputdev->name = MXC_TS_NAME;
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mxc_inputdev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
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mxc_inputdev->keybit[BIT_WORD(BTN_TOUCH)] |= BIT_MASK(BTN_TOUCH);
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mxc_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(mxc_inputdev);
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if (retval < 0) {
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input_free_device(mxc_inputdev);
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return retval;
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}
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input_ts_installed = 1;
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kernel_thread(ts_thread, NULL, CLONE_VM | CLONE_FS);
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printk("mxc input touchscreen loaded\n");
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return 0;
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}
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static void __exit mxc_ts_exit(void)
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{
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input_ts_installed = 0;
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input_unregister_device(mxc_inputdev);
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if (mxc_inputdev) {
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input_free_device(mxc_inputdev);
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mxc_inputdev = NULL;
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}
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}
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late_initcall(mxc_ts_init);
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module_exit(mxc_ts_exit);
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MODULE_DESCRIPTION("MXC input touchscreen driver");
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MODULE_AUTHOR("Freescale Semiconductor, Inc.");
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MODULE_LICENSE("GPL");
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