Subject: [@num@/@total@] touch: mc13783 driver From: Juergen Beisert This patch adds mc13783 based touch support. It depends on i.MX27 master SPI support and basic PMIC support. Note: This patch is not finished yet. It needs additional clean up and doxygen comment removement. We also have to check if the PMIC support is a multi function device and might fit better there. NOT FOR MAINLINE YET. Signed-off-by: Juergen Beisert Signed-off-by: N.N. (FIXME: get a sign from freescale) --- Kconfig | 12 +++++++ Makefile | 1 mxc_ts.c | 103 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 116 insertions(+) Index: linux-2.6.24-rc5/drivers/input/touchscreen/Kconfig =================================================================== --- linux-2.6.24-rc5.orig/drivers/input/touchscreen/Kconfig +++ linux-2.6.24-rc5/drivers/input/touchscreen/Kconfig @@ -210,6 +210,18 @@ config TOUCHSCREEN_USB_COMPOSITE To compile this driver as a module, choose M here: the module will be called usbtouchscreen. +config TOUCHSCREEN_MXC + tristate "MXC touchscreen input driver" + depends on MXC_MC13783_ADC + help + Say Y here if you have an MXC based board with touchscreen + attached to it. + + If unsure, say N. + + To compile this driver as a module, choose M here: the + module will be called mxc_ts. + config TOUCHSCREEN_USB_EGALAX default y bool "eGalax, eTurboTouch CT-410/510/700 device support" if EMBEDDED Index: linux-2.6.24-rc5/drivers/input/touchscreen/Makefile =================================================================== --- linux-2.6.24-rc5.orig/drivers/input/touchscreen/Makefile +++ linux-2.6.24-rc5/drivers/input/touchscreen/Makefile @@ -19,3 +19,4 @@ obj-$(CONFIG_TOUCHSCREEN_PENMOUNT) += pe obj-$(CONFIG_TOUCHSCREEN_TOUCHRIGHT) += touchright.o obj-$(CONFIG_TOUCHSCREEN_TOUCHWIN) += touchwin.o obj-$(CONFIG_TOUCHSCREEN_UCB1400) += ucb1400_ts.o +obj-$(CONFIG_TOUCHSCREEN_MXC) += mxc_ts.o \ No newline at end of file Index: linux-2.6.24-rc5/drivers/input/touchscreen/mxc_ts.c =================================================================== --- /dev/null +++ linux-2.6.24-rc5/drivers/input/touchscreen/mxc_ts.c @@ -0,0 +1,107 @@ +/* + * Driver for the Freescale Semiconductor MXC touchscreen. + * + * Copyright 2006-2007 Freescale Semiconductor, Inc. All Rights Reserved. + */ + +/* + * The code contained herein is licensed under the GNU General Public + * License. You may obtain a copy of the GNU General Public License + * Version 2 or later at the following locations: + * + * http://www.opensource.org/licenses/gpl-license.html + * http://www.gnu.org/copyleft/gpl.html + * + * The touchscreen driver is designed as a standard input driver which is a + * wrapper over low level PMIC driver. Most of the hardware configuration and + * touchscreen functionality is implemented in the low level PMIC driver. During + * initialization, this driver creates a kernel thread. This thread then calls + * PMIC driver to obtain touchscreen values continously. These values are then + * passed to the input susbsystem. + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#include "linux/freezer.h" + +#define MXC_TS_NAME "mxc_ts" + +static struct input_dev *mxc_inputdev = NULL; +static u32 input_ts_installed; + +static int ts_thread(void *arg) +{ + t_touch_screen ts_sample; + s32 wait = 0; + daemonize("mxc_ts"); + while (input_ts_installed) { + try_to_freeze(); + memset(&ts_sample, 0, sizeof(t_touch_screen)); + pmic_adc_get_touch_sample(&ts_sample, !wait); + + input_report_abs(mxc_inputdev, ABS_X, ts_sample.x_position); + input_report_abs(mxc_inputdev, ABS_Y, ts_sample.y_position); + input_report_abs(mxc_inputdev, ABS_PRESSURE, + ts_sample.contact_resistance); + input_sync(mxc_inputdev); + + wait = ts_sample.contact_resistance; + msleep(20); + } + + return 0; +} + +static int __init mxc_ts_init(void) +{ + mxc_inputdev = input_allocate_device(); + if (!mxc_inputdev) { + printk(KERN_ERR + "mxc_ts_init: not enough memory for input device\n"); + return -ENOMEM; + } + + mxc_inputdev->name = MXC_TS_NAME; + mxc_inputdev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); + mxc_inputdev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); + mxc_inputdev->absbit[0] = BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) | + BIT_MASK(ABS_PRESSURE); +#if 0 + input_set_abs_params(tw->dev, ABS_X, TW_MIN_XC, TW_MAX_XC, 0, 0); + input_set_abs_params(tw->dev, ABS_Y, TW_MIN_YC, TW_MAX_YC, 0, 0); +#endif + if (input_register_device(mxc_inputdev) != 0) { + printk(KERN_ERR "Registering touch failed!\n"); + return -ENOMEM; /* FIXME */ + } + + input_ts_installed = 1; + kernel_thread(ts_thread, NULL, CLONE_VM | CLONE_FS); + printk("mxc input touchscreen loaded\n"); + return 0; +} + +static void __exit mxc_ts_exit(void) +{ + input_ts_installed = 0; + input_unregister_device(mxc_inputdev); + + if (mxc_inputdev) { + input_free_device(mxc_inputdev); + mxc_inputdev = NULL; + } +} + +late_initcall(mxc_ts_init); +module_exit(mxc_ts_exit); + +MODULE_DESCRIPTION("MXC input touchscreen driver"); +MODULE_AUTHOR("Freescale Semiconductor, Inc."); +MODULE_LICENSE("GPL");